• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In the wide-angle macro high magnification lens system according to the present invention, from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth having positive refractive power The lens group is arranged in sequence. The first lens group I is fixed at the time of shifting, and the focus is matched according to the change of the object point, the second lens group moves along the optical axis to change the shifting, and the third lens group at the shifting Moving along the optical axis corrects aberrations that change with the movement of the second lens group, and the fourth lens group forms an image. Wide-angle close-up for performing this function gobyeon times the lens system, 0.4 <| P 2 | < 0.7, 0.5 <P <0.7, 35 × f W < object distance <50 × f W (P 2 : refractive power of the second lens unit, P 4 : refractive power of the fourth lens group, f W : focal length of the entire lens system at the wide-angle end),
    公开号:KR20000060379A
    申请号:KR1019990008615
    申请日:1999-03-15
    公开日:2000-10-16
    发明作者:김후식
    申请人:이중구；삼성테크윈 주식회사；
    IPC主号:
    专利说明:

    A wide angle high power macro zoom lens
    The present invention relates to a wide-angle macro high magnification lens system, and more particularly, to a wide-angle macro high magnification lens system used as a macro imaging optical system for an imaging device such as a charge coupled device (CCD).
    In general, an imaging apparatus using a CCD element converts an optical image into an electrical signal and outputs the converted image, and the output signal is transmitted to a display device such as a monitor or a television and reproduced as an image.
    Background Art [0002] In recent years, the use of a video pregenter, which reads an image of a subject placed on a stage (platen) and reproduces it through a TV or the like, which is a separate image display device, is increasing. In seminars mainly in the field of education, advertising / design, medicine, etc., the effect of education is increased by effectively reproducing images corresponding to materials such as three-dimensional objects and color pictorials.
    The real imager mainly uses a zoom lens as a main imaging lens, and a macro adapter lens is added to the zoom lens as needed. A conventional real imager using such an optical system has a resolution equivalent to that of a normal television, and a video signal of a moving picture that changes 60 screens per second is a main output signal. In addition, in order to photograph objects of various sizes at various magnifications, the magnification is adjusted by changing the focal length of the zoom lens, which is an imaging lens, or by changing the object distance.
    In addition, the conventional real imager should be able to match the focus from the shooting distance infinity when shooting a person near the real imager to the shooting distance finite range when shooting an object on the document glass. In a zoom lens consisting of four lens groups so that the signal clarity is the highest, a so-called rear focus matching method is used to feedback-adjust the position of the fourth lens group according to the video signal. Therefore, the imaging performance of the optical system was largely determined by the zoom lens for the video camera used.
    However, since a high quality real imager outputs 5 to 7 still images per unit time, it is not possible to use the conventional group focus matching method by feedback of the existing video signal. Therefore, a so-called all-focus focusing zoom lens should be used for a high quality real imager, even if shifting is performed.
    However, unlike the rear focus matching method, which has a high angle of view and a wide field of view at the same time, the front focus matching method is difficult to reduce aberration correction and mechanical tolerances to achieve both high shift and wide angle of view. There are many aspects in which the specification itself is not suitable for the use of an actual imager.
    For example, in the case of the F number (aperture), the original zoom lens was designed as a small F number to meet the video camera's usage conditions.However, in the case of a high quality real imager, the F number of the lens is used because the auxiliary illumination light is used. Need not be large. If the F number of the zoom lens used for the high quality real imager is large, problems such as a shallow depth of field and a strict instrument tolerance occur. In addition, since the half angle of view of a zoom lens for a general video camera is about 24 °, when the entire A4 paper screen, which is the maximum shooting range of a general real imager, is to be taken, the shooting distance should be farther away, so the height of the camera head of the real imager is increased. The result is an increase in overall product size and loss of balance.
    In addition, at the maximum magnification of a general real imager, the zoom ratio must be increased to satisfy the condition that the 35 mm film is to be filled on the screen. However, the general 8x zoom ratio can not satisfy these conditions.
    SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a lens system suitable for a high resolution real imager. In particular, a wide-angle macro high magnification lens system, which is more suitable for macro shooting and has an F number of about 3.0 and has a zoom ratio of 12 times higher, It is to provide.
    1 is a view showing the lens configuration and the movement state for each zoom position of a wide-angle macro high-resolution lens system according to an embodiment of the present invention,
    2 is an aberration diagram at an object distance of 320 mm and a wide-angle end of a wide-angle macro high magnification lens system according to an exemplary embodiment of the present invention.
    3 is an aberration diagram at an intermediate end of an object distance of 320 mm in a wide-angle macro high-resolution lens system according to an exemplary embodiment of the present invention.
    4 is an aberration diagram at a telephoto end of an object distance of 320 mm in a wide-angle macro high-resolution lens system according to an exemplary embodiment of the present invention.
    5 is an aberration diagram at an object distance of 220 mm and a wide-angle end of the wide-angle macro high magnification lens system according to the embodiment of the present invention;
    FIG. 6 is an aberration diagram at an intermediate end of an object distance of 220 mm in a wide-angle macro high magnification lens system according to an exemplary embodiment of the present invention.
    FIG. 7 is an aberration diagram at a telephoto end of an object distance of 220 mm for a wide-angle macro high magnification lens system according to an embodiment of the present invention.
    Fig. 8 is a lateral aberration diagram at an object distance of 320mm and a wide-angle end of a wide-angle macro high magnification lens system according to an embodiment of the present invention.
    9 is a horizontal aberration diagram at an intermediate end of an object distance of 320 mm in the wide-angle macro high-division lens system according to the embodiment of the present invention;
    Fig. 10 is a lateral aberration diagram at an object distance of 320 mm and a telephoto end of a wide-angle macro high magnification lens system according to an embodiment of the present invention.
    Fig. 11 is a lateral aberration diagram at an object distance of 220mm and a wide-angle end of the wide-angle macro high magnification lens system according to the embodiment of the present invention.
    Fig. 12 is a lateral aberration diagram at an intermediate end of an object distance of 220 mm in the wide-angle macro high magnification lens system according to the embodiment of the present invention.
    Fig. 13 is a lateral aberration diagram at a telephoto end of an object distance of 220 mm in a wide-angle macro high magnification lens system according to an embodiment of the present invention.
    14 is a diagram illustrating an aberration contribution analysis for each lens of the wide-angle macro high magnification lens system according to the embodiment of the present invention;
    15A to 15C are diagrams illustrating third-order aberration values for each zoom position of a wide-angle macro high-variability lens system according to an exemplary embodiment of the present invention.
    In order to achieve the above technical problem, the wide-angle macro high magnification lens system according to the present invention has a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having negative refractive power from the object side. And a fourth lens group having positive refractive power are sequentially arranged. The first lens group I is fixed at the time of shifting, and the focus is matched according to the change of the object point, the second lens group moves along the optical axis to change the shifting, and the third lens group at the shifting The aberration shifted along the optical axis to be changed according to the movement of the second lens group is corrected, and the fourth lens group forms an image.
    While performing this function, the wide-angle macro high magnification lens system according to the present invention has a 0.4 <| P 2 | <0.7, 0.5 <P <0.7, 35 × f W <object distance <50 × f W (P 2 : second lens Group refractive power, P 4 : refractive power of the fourth lens group, f W : focal length of the entire lens system at the wide-angle end).
    Next, with reference to the accompanying drawings, the most preferred embodiment that can be easily implemented by those skilled in the art to which the present invention pertains will be described in detail.
    1 shows a wide-angle macro high magnification lens system according to an embodiment of the present invention.
    As shown in FIG. 1, the first lens group I, the second lens group II, the third lens group III, and the fourth lens group IV are sequentially formed from the object side on the same optical axis. Are arranged.
    The first lens group (I) (I) has a positive refractive power, and the first lens (1) having both concave and negative refractive powers sequentially arranged from the object side, and a second having both convex and positive refractive powers, respectively. A lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 having a meniscus shape in which the object side surface is convex and having positive refractive power.
    The second lens group II has negative refractive power, and a sixth lens 6 having a negative meniscus shape having a convex meniscus shape and a negative refractive power arranged sequentially from the object side, and having both surfaces concave and negative refractive power. The seventh lens 7 and the eighth lens 8 having both surfaces convex and positive refractive power.
    The third lens group III includes a ninth lens 9 having a negative refractive power and a meniscus shape in which an image side surface is convex.
    The fourth lens group IV has a positive refractive power, and a tenth lens 10 having both sides convex and positive refractive power sequentially arranged from the object side, and an eleventh lens 11 having both surfaces convex and positive refractive power. ), A twelfth lens 12 having a convex meniscus shape with negative refractive power, a thirteenth lens 13 having both convex and positive refractive power, and a meniscus shape having a convex object side A fourteenth lens 14 having refractive power, a fifteenth lens 15 having both surfaces convex and positive refractive power, and a sixteenth lens 16 having a positive meniscus lens having a convex object side and having positive refractive power, An aperture A1 is positioned between the ninth lens 9 and the tenth lens 10, and an optical low pass filter 17 is positioned on the object side of the sixteenth lens 16.
    The operation of the wide-angle macro high magnification lens system according to the embodiment of the present invention having such a structure will be described.
    The wide-angle macro high magnification lens system according to the present invention consists of a total of 16 lenses, and each lens group is configured to minimize aberration fluctuations due to variation by minimizing various aberrations such as correction of axial chromatic aberration and magnification chromatic aberration for each lens group. have.
    The first lens group I (I) and the fourth lens group IV are fixed at the time of shifting, and the second lens group II and the third lens group III move along the optical axis. The first lens group (I) (I) merges the focus according to the variation of the object point, and the second lens group (II) moves along the optical axis to perform the shift. The third lens group III corrects aberrations fluctuated by the movement of the second lens group II, and serves to keep a shop constantly caused when the second lens group II changes. The fourth lens group IV serves to image an altered quasi-parallel bundle of afocal rays. As a whole, the quasi-parallel magnification is changed by the first lens group (I) (I) to the third lens group (III), and the quasi-parallel shift occurs, and the fourth lens group (IV) performs an imaging function unique to the imaging lens. do.
    The fourth lens group IV is the same as the retro focus method except that the aberration is generated in a direction opposite to the aberration generated in the first lens group I to the third lens group III except for the distortion aberration. Perform aberration correction. That is, in the fourth lens group IV, in order to reduce the amount of aberration that occurs basically, the front lens unit and the three lenses of the three lenses (the tenth lens 10 to the twelfth lens 12) are removed from the object side. The lens is divided into a rear lens unit including the lenses (th thirteenth lens 13 to sixteenth lens 16), and has a structure of providing a required refractive power while minimizing the amount of aberration.
    In addition, in the first lens group (I) (I) to the third lens group (III), astigmatism and magnification chromatic aberration correction that are likely to be insufficient in correction by aberration correction and inter-lens aberration correction for each lens group are effectively executed. .
    Next, the design conditions of the wide-angle macro high magnification lens system according to the present invention will be described in more detail.
    In the present invention, in order to implement an optical system having the required performance, the distortion of the finite distance is suppressed while balancing the performance of the optical system in consideration of the aberration change due to the movement of the nodular point ( ) Which is an inherent characteristic of the finite optical system. The design point was made.
    Given the variable magnification ratio, which is the ratio of the longest focal length and the shortest focal length according to the zoom position, and the postfocal distance that is kept constant, the refractive power and zoom position for each lens group satisfying it are determined as the solution of the equation.
    More specifically, when the curvature of each lens surface is c i , the distance between the lens surfaces is d i , the refractive index of the medium is n i , the incident height of the light beam at each lens surface is h i , and the paraxial angle is u i . , The following relationship is established.
    h i + 1 = h i -d i u i
    In addition, paraxial ray tracing is as following Formula (2).
    n i u i -n i-1 u i-1 = c i h i (n i -n i-1 )
    This equation is based on the paraxial ray tracing equation, and when the focal length at n zoom position is f n , the refractive power of the nth lens group is P n = 1 / f n , from the nth lens group at the wide-angle end zoom position. E nW is the distance between the principal points to the next lens group; e nT is the distance between the principal points from the nth lens group to the next lens group at the telephoto zoom position; f W is the focal length at the wide end zoom position; When the focal length f of the T, as the zoom ratio Z = f T / f W, f the focal length and then B, and then given a six equations such as equation (3).
    1 = P 1 + P 2 (1-e 1W P 1 ) + P 3 (1-e 1W P 1 -e 2W P 1 -e 2W P 2 + e 1W e 2W P 1 P 2 ) + P 4 e 4W
    1 / z = P 1 + P 2 (1-e 1T P 1 ) + P 3 (1- e 1T P 1 -e 2T P 2 + e 1T e 2T P 1 P 2 + P 4 (e 4T / Z)
    e 4W = 1-e 1W P 1 -e 2W {P 1 + P 2 (1-e 1W P 1 )}
    -e 3W [P 1 + P 2 (1-e 1W P 1 ) + P 3 {1- e 1W P 1 -e 2W (P 1 + P 2 (1- e 1W P 1 ))}]
    e 4T / Z = 1-e 1T P 1 -e 2T {P 1 + P 2 (1-e 1T P 1 )}
    -e 3T [P 1 + P 2 (1-e 1T P 1 ) + P 3 {1- e 1T P 1 -e 2T (P 1 + P 2 (1- e 1T P 1 ))}]
    e 1W + e 2W + e 3W = e 1T + e 2T + e 3T
    e 4W = e 4T = f B
    The variable ratio Z is given as high as 11.5, and is set as P 4 = 1.0, e 4W = e 4T = 3.18557 to sufficiently secure the post focal length, and then e 1W = 0.819, e 2T = 0.820 for the minimum value. Solving the above simultaneous equations, e 2W also increases when e 3T and e 3W increase to similar values. In other words, when e 3T , which is a mechanical space for entering the aperture, is long, the amount of movement of the second lens group increases, resulting in an overall optical system. At the same time, the absolute value of P 3 having negative refractive power increases and the absolute value of P 2 decreases.
    Therefore, in order to keep e 3T as short as possible, and to shorten the overall optical system length, the lens surface having positive refractive power is positioned on the upper side of the third lens group, and the lens surface having negative refractive power is disposed on the object side and the principal point is placed on the upper side. Use the technique of moving to In this way, the refractive power and the distance of each lens group are obtained to obtain the skeleton of the entire zoom lens.
    However, since the actual conditions for use are finite distances, the conditions of e 4W = e 4T = f B will be different, and the positions of the principal point at the wide end and telephoto zoom positions will be changed, so that only the entire skeleton is maintained and the spacing between the lens groups is It will be somewhat different.
    Next, aberration correction of the wide-angle macro high magnification lens system according to the embodiment of the present invention will be described.
    The following table shows the aberration contributions of each lens group at the intermediate zoom position, which is the standard for aberration correction.
    Lens groupZoom positionSATCOTASSASPTBDSTAXLATPTZWide angle0.0000.001-0.135-0.058-0.0201.6220.000-0.040-0.0146 First groupMiddle0.0000.011-0.203-0.081-0.0200.951-0.002-0.027-0.0146Telephoto-0.0160.119-0.411-0.149-0.0180.505-0.012-0.011-0.0146Wide angle0.003-0.0220.2270.1270.077-2.016-0.0070.0220.056 2nd groupMiddle0.015-0.0400.3000.1520.078-0.872-0.0150.0220.056Telephoto0.045-0.1140.4750.2050.069-0.443-0.018-0.0250.056Wide angle0.0140.0550.1380.0650.029-0.0290.039-0.0070.021 3rd groupMiddle0.0180.0720.1040.0540.029-0.0470.03-0.0110.021Telephoto0.0140.0570.1140.0550.026-0.0300.037-0.0080.021Wide angle-0.025-0.051-0.222-0.137-0.095-0.123-0.0040.086-0.069 4th groupMiddle-0.038-0.063-0.365-0.134-0.0960.130-0.0140.049-0.069Telephoto-0.028-0.0500.121-0.159-0.0850.123-0.0120.049-0.069Wide angle-0.008-0.01760.009-0.004-0.010-0.2640.0200.029-0.007 Fifth groupMiddle-0.006-0.020-0.024-0.014-0.0100.1620.0030.013-0.007Telephoto0.0160.016-0.022-0.013-0.0130.155-0.0060.004-0.007
    In Table 1, SA is the transverse spherical, TCO is the tangential coma, SCO is the sagittal coma, TAS is the tangential astigmatism, and SAS is the spherical astigmatism ( sagittal astigmatism, PTB for Petzval sum, DST for transverse distortion, AX for transverse axial color aberration, and LAT for transverse lateral color aberration.
    Referring to Table 1, it can be seen that excessive residual aberration of the fourth lens group IV is corrected by another lens group. That is, although the aberration correction is made as much as the fourth lens group IV itself, some aberrations remain, and the sign of the residual aberration coincides with the sign of the whole aberration except in the case of axial chromatic aberration. The residual aberration of the fourth lens group IV is mainly corrected by the third lens group III, and the sign of the aberrations of the third lens group III is completely opposite to the fourth lens group IV. Like the fourth lens group IV, the aberrations of the first lens group I having positive refractive power have the same sign as the fourth lens group IV except for the coma aberration and the chromatic aberration of the magnification, and the second lens group II The aberration is mainly corrected by
    In the first lens group I and the second lens group II, except for the axial chromatic aberration, the aberrations all have signs in opposite directions. The astigmatism, which is mainly a problem in the lens system according to the present invention, is mainly corrected by the second lens group II. When the aberration correction amount of the second lens group II is increased, the astigmatism correction is caused by the second lens group II. As the residual amount of axial chromatic aberration generated is excessive, the aberration balance of the entire lens system is broken, which causes a limitation in astigmatism correction.
    In more detail, each lens shown in FIG. 14 attached to the sixth lens 6 that is responsible for the negative refractive power of the second lens group II corrects astigmatism and generates excessive on-axis chromatic aberration. This can be seen in the aberration contribution analysis.
    On the other hand, in the optical system having the same structure as the lens system according to the present invention, the amount of negative distortion aberration generated in the lens having positive refractive power is excessive, and the correction is mainly performed in the lens having the sixth negative refractive power. If the astigmatism correction is excessive, disparity aberration, spherical aberration, and axial chromatic aberration are simultaneously generated, so that the second lens group II has the refractive power to satisfy the zoom lens trajectory but maintains the proper shape as a whole. Balance can be maintained.
    The conditions that make up the framework of these aberrations are extracted from the data of the design and expressed in simple equations,
    P 1 = 1 / 36.9331 = 0.1733
    P 2 = -1 / 10.1897 = -0.6281
    P 3 = -1 / 31.8064 = -0.2012
    P 4 = 1 / 9.512 = 0.6728
    Becomes At this time, it should be noted that the lens system according to the present invention exhibits performance at an object distance within 50 times the focal length f W at the wide-angle end zoom position. In this imaging performance, the synthetic refractive power of the optical system from the first lens group I to the third lens group III is kept small, and the fourth lens group IV is responsible for most of the total optical system refractive power. The refractive power P 4 of the lens group IV is limited to a value larger than 0.5 and smaller than 0.7.
    That is, the following equation is established.
    0.4 <| P 2 | <0.7
    0.5 <P <0.7
    At this time, if the absolute value of the refractive power P 2 of the second lens group II is less than 0.4, the shift amount of the second lens group II should be long at the time of shifting, so that the length of the lens system as a whole increases. When the absolute value of the refractive power P 2 of the second lens group II is greater than 0.7, the sensitivity to the tolerance of the second lens group II is increased, and the residual amount of axial chromatic aberration becomes excessive, making aberration correction and fabrication difficult. On the other hand, the relationship r 12 / r 13 between the radius of curvature r 12 of the object-side surface of the sixth lens and the radius of curvature r 13 of the image side of the sixth lens having negative refractive power within the second lens group II satisfies the following equation.
    6 <r 12 / r 13 <7.5
    If the value of r 12 / r 13 r 12 / r 13 is less than the lower limit 6, the astigmatism correction becomes incomplete, and if r 12 / r 13 is larger than the upper limit 7.5, axial chromatic aberration and distortion aberration residual amount are excessive.
    In addition, the fourth lens group is largely divided into a front part and a rear part, and three front lenses have a synthetic refractive power P 4f = 1 / 15.9172, and four rear lenses have a synthetic refractive power P 4r = 1 / 23.8679. The appropriate relationship between these two parts is given by
    1.3 <P 4f / P 4r <1.7
    If the value of P 4f / P 4r is less than the lower limit 1.3, the definition of the meridian astigmatism generated by P 4f becomes too large and the astigmatism increases at the intermediate and telephoto zoom positions. On the contrary, if the P 4f / P 4r value is larger than the upper limit of 1.7, the residual amount of spherical aberration and coma aberration increases at the wide end and middle end zoom positions.
    Meanwhile, the following equation is given to the interval d 4f-4r between the two parts P 4f and P 4r .
    2.5 x f W <d 4f-4r <3.5 x f W
    When the d 4f-4r value is smaller than the lower limit of 2.5, the aberration correction becomes difficult because the refractive power of the lenses having positive refractive power of each lens group must be larger in order to maintain the same refractive power. On the contrary, when the d 4f-4r value is larger than the upper limit of 3.5, the lens becomes longer and the practical value is lowered.
    More detailed aberration contributions of the wide-angle macro high magnification lens system according to this invention are shown in the accompanying Figures 15A to 15C.
    The implementation values of the wide-angle macro high magnification lens system according to the embodiment of the present invention, which are designed to satisfy such design conditions and conditions for aberration correction, are as follows.
    ri (i = 1 to 36) represents the radius of curvature of the refractive surface, di (1 = 1 to 35) represents the thickness of the lens system or the distance between the lens systems, and the unit of the value representing the length is mm.
    Example values of the high magnification lens system according to the exemplary embodiment of the present invention are shown in Table 2 below.
    Face numberRadius of curvature (r)Thickness, distance (d)mediumEffective radius OBJ0.3977895e12320.000000 One-77.688002.400000FDS90_HOYA24.72 294.778001.150000 23.80 3150.531007.500000BACD5_HOYA23.80 4-77.688000.200000 23.74 5187.729004.700000LAC14_HOYA23.44 6-187.729000.200000 23.40 767.068005.000000LAC14_HOYA22.66 8346.827000.200000 22.27 935.123006.800000LAC14_HOYA20.25 10138.913001.000000 19.40 1157.570001.100000TAF1_HOYA9.09 128.548134.100000 6.70 13-26.329000.900000TAF1_HOYA6.70 1410.233004.600000FDS90_HOYA6.49 15-216.6200026.002907 6.30 16-15.117001.000000BSC7_HOYA2.95 17-184.606002.121190 2.90 18∞2.500000 3.72 19214.770001.800000BACD16_HOYA4.16 20-12.370000.100000 4.26 2126.081001.653113LAC14_HOYA4.17 22-47.006631.100000 4.08 23-16.460001.000000FDS90_HOYA3.95 24-55.5272517.445848 4.00 2538.925002.300000BACD16_HOYA5.10 26-25.241000.150000 5.11 2722.500000.900000FDS90_HOYA4.97 289.356000.876943 4.70 2928.546532.300000BSC7_HOYA4.70 30-45.487100.100000 4.80 3115.585002.300000BSC7_HOYA4.85 3253.213271.000000 4.71 33∞4.000000BSC7_HOYA4.65 34∞4.000000 4.43
    The medium of the lens constituting the high magnification lens system according to the present invention has the characteristics as described in Table 3 below.
    Glass code656.28587.28546.10486.13435.80Abbe's FDS90_HOYA1.8364911.8466461.8550421.8720901.89414923.78 BACD5_HOYA1.5861871.5891271.5914211.5958061.60100761.0 LAC14_HOYA1.6929691.6968001.6997961.7055331.71235660.34 TAF1_HOYA1.7677961.7724971.7762061.7833641.79193849.6 BSC7_HOYA1.5143181.5167971.5187181.5223691.52667364.20 BACD16_HOYA1.6172691.6204071.6228601.6275501.63310155.46
    The distance between the first lens group I and the second lens group II, the distance between the second lens group II and the third lens group III, and the third The value of the interval between the lens group III and the fourth lens group IV is shown in Table 4 below.
    Wide angleMiddleTelephoto FNO3.293962.863773.14232 d 0320.00000320.00000320.00000 d 101.0000015.5569324.04555 d 110.000000.000000.00000 d 1626.002918.862272.10000 d 182.121194.704902.97855 d 354.000004.000004.00000
    The aberration characteristics of the wide-angle macro high magnification lens system made of such an embodiment are shown in FIGS. 2 to 13 attached to each zoom position and object distance, where S represents aberration in the sagittal direction, and T is tangential. aberration in the (tangential) direction, d denotes light of d-line wavelength, c denotes light of C-line wavelength, and g denotes light of g-line wavelength.
    As described above, according to the embodiment of the present invention, it is possible to provide a close-up photographing lens system suitable for a high resolution real imager and having a high variation and a wide angle of view.
    In addition, it is possible to provide a wide-angle macro high magnification lens system having an F number of about 3.0 and having a high zoom ratio of 12 times.
    权利要求:
    Claims (6)
    [1" claim-type="Currently amended] From the object side,
    A first lens group having positive refractive power and fixed at shifting and matching focal points according to variation of the object point;
    A second lens group having negative refractive power and shifting along the optical axis to perform shifting;
    A third lens group having negative refractive power and adapted to correct the aberration which is changed along with the movement of the second lens group by moving along the optical axis when shifting;
    A wide-angle macro high magnification lens system having a positive refractive power, and comprising a fourth lens group fixed at the time of shift and forming an image, and satisfying the following conditions.
    0.4 <| P 2 | <0.7
    0.5 <P <0.7
    35 × f W <Object Distance <50 × f W
    P 2 : refractive power of the second lens group
    P 4 : refractive power of the fourth lens group
    f W : Focal length of the entire lens system at the wide end
    [2" claim-type="Currently amended] The method of claim 1,
    The wide-angle macro high magnification lens system having a ratio of the longest focal length and the shortest focal length of the entire lens system at the time of shifting by more than 11.5 times.
    [3" claim-type="Currently amended] The method of claim 2,
    A wide-angle macro high magnification lens system that satisfies further including the following conditions.
    6 <r 12 / r 13 <7.5
    r 12 : radius of curvature of the object-side surface of the lens having the first negative refractive power from the object side in the second lens group.
    r 13 : radius of curvature of the image-side surface of the lens having the first negative refractive power from the object side in the second lens group.
    [4" claim-type="Currently amended] The method of claim 3,
    And the fourth lens group comprises a front lens portion consisting of three lenses and a rear lens portion consisting of three lenses, and further satisfies the following conditions.
    1.3 <P 4f / P 4r <1.7
    P 4f : Synthetic refractive power of all lens parts
    P 4r : Synthetic refractive power of the rear lens portion
    [5" claim-type="Currently amended] The method of claim 4, wherein
    A wide-angle macro high magnification lens system that satisfies further including the following conditions.
    2.5 x f W <d 4f-4r <3.5 x f W
    d 4f-4r : Distance between the front lens part and the rear lens part
    [6" claim-type="Currently amended] The method of claim 1,
    The first lens group has a positive refractive power, a first lens having both surfaces sequentially concave from the object side and having negative refractive power, and a second lens, a third lens, and a fourth having both surfaces convex and positive refractive power, respectively. A lens and a fifth lens having a convex meniscus shape of which an object side is convex and having positive refractive power,
    The second lens group has a negative refractive power, a sixth lens having a negative meniscus shape having a convex meniscus shape of which object sides are sequentially arranged from an object side, a seventh lens having both concave and negative refractive powers, and a double sided surface. Is made up of an eighth lens having convex and positive refractive power,
    The third lens group includes a ninth lens having negative refractive power and a meniscus shape in which an image side surface is convex and negative refractive power.
    The fourth lens group has a positive refractive power, and a tenth lens having both sides convex and positive refractive power sequentially arranged from an object side, an eleventh lens having both sides convex and positive refractive power, and a manifold having an image side convex. A twelfth lens having a squirrel shape and negative refractive power, a thirteenth lens having both convex and positive refractive power, a fourteenth lens having a meniscus shape having a convex object side and negative refractive power, and a convex and positive refractive power at both sides A wide-angle macro high magnification lens system comprising a fifteenth lens having a sixteenth lens and a sixteenth lens having a convex meniscus shape and having positive refractive power.
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    同族专利:
    公开号 | 公开日
    KR100567577B1|2006-04-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-03-15|Application filed by 이중구, 삼성테크윈 주식회사
    1999-03-15|Priority to KR19990008615A
    2000-10-16|Publication of KR20000060379A
    2006-04-05|Application granted
    2006-04-05|Publication of KR100567577B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR19990008615A|KR100567577B1|1999-03-15|1999-03-15|A wide angle high power macro zoom lens|
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