Defocusing apparatus for optical system of optical pickup

专利摘要:
PURPOSE: A defocusing device of an optical pickup optical system is provided to combine a laser diode with an optical pickup base of an optical pickup optical system such that a position of the laser diode can be controlled along an optical path, thereby controlling a defocusing by controlling the position of the laser diode. CONSTITUTION: Light emitted from a laser diode(1) passes through a grating(3), and is incident on a prism(4). The incident light passes through a half mirror(5) disposed on one side of the prism(4), and passes through a collimator lens(6) and an objective lens(7), then is received in a disk(9). The light is received in a photo diode(8) disposed on the other side of the prism(4). A position of the laser diode(1) can be controlled along an optical path.
公开号:KR20040067464A
申请号:KR1020030004574
申请日:2003-01-23
公开日:2004-07-30
发明作者:김성일
申请人:엘지전자 주식회사；
IPC主号:

专利说明:

DEFOCUSING APPARATUS FOR OPTICAL SYSTEM OF OPTICAL PICKUP}
[9] The present invention relates to a defocusing apparatus of an optical pickup optical system, and in particular, a laser diode coupled to an optical pickup base of an optical pickup optical system so as to be adjustable in position along an optical path so that the defocusing can be adjusted by adjusting the position of the laser diode. A defocusing device of a pickup optical system.
[10] In general, the optical pickup optical system consists of a laser diode (LD) that produces light, a lens that adjusts the light produced by the laser diode, a mirror, and a sensor that detects light reflected from the surface of a recording disk. have.
[11] In this case, the laser diode uses the light to operate the servo when it emits light according to various optical elements and disks, and serves as an optical pickup.
[12] In addition, there is a lens used to focus the light emitted from the laser diode on the disk and the light on the photo diode, which is called a CD NA compensation lens.
[13] FIG. 1 is a block diagram of a conventional optical pickup optical system. As shown in FIG. 1, light emitted from a laser diode 1 passes through a correction lens 2 and a grating 3 and then enters a prism 4. Passing through the half mirror 5 disposed on one side of the prism 4, passing through the collimator lens 6 and the objective lens 7 to form a disk 9, and the other side of the prism 4 It is comprised so that it may be made to the photodiode 8 arrange | positioned at.
[14] As described above, in the conventional optical pickup optical system, a laser diode 1 is used to emit light as shown, and a correction lens (.defocus) is used to adjust defocus (.defocus) using the basic laser diode 1 in the optical pickup. 2), the correction lens (2) is moved back and forth to focus the light emitted from the laser diode, while hanging the server (Server) needed for the optical pickup to adjust the defocus.
[15] However, in the conventional optical pickup optical system as described above, the optical pickup optical system needs to use a separate correction lens to focus the light emitted from the laser diode on the disk and the light on the photo diode. The number of optical devices required for the increase is increased, thereby disadvantageous in miniaturization of the optical pickup, the defocus adjustment is difficult, there is a problem that the productivity is reduced.
[16] The present invention has been made to solve the above problems and defects as described above, by combining the laser diode to the optical pickup base of the optical pickup optical system so as to adjust the position along the optical path to defocusing by adjusting the position of the laser diode An object of the present invention is to provide a defocusing apparatus for an optical pickup optical system that can be adjusted.
[1] 1 is a block diagram of a conventional optical pickup optical system.
[2] 2 to 4 show the configuration of the optical pickup optical system according to the present invention,
[3] 2 is a block diagram of an optical pickup optical system according to the present invention.
[4] 3 is a front view of the laser diode.
[5] 4 is a bottom view of the laser diode.
[6] <Description of the symbols for the main parts of the drawings>
[7] 1: laser diode 1a: thread
[8] 9: disc
[17] In order to achieve the above object, the defocusing apparatus of the optical pickup optical system according to the present invention enables the position adjustment of the laser diode of the optical pickup optical system along the optical path to emit light for recording and reproducing information on the disk in the optical disk drive. Arranged to adjust the defocusing by adjusting the position of the laser diode.
[18] In addition, the laser diode has a screw thread formed on the outer peripheral surface of the housing is composed of a screw coupling to the optical pickup base.
[19] The gist of the present invention as described above can process the housing (CAN, STEM) portion of the laser diode in the form of a screw (screw) to adjust the defocusing by screwing the laser diode without using a correction lens.
[20] In this way, the number of optical elements can be reduced, so that optical pickup can be miniaturized, and defocusing can be more easily adjusted to shorten production time.
[21] Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail as follows.
[22] 2 to 4 show the configuration of the optical pickup optical system according to the present invention, Figure 2 is a block diagram of the optical pickup optical system according to the present invention, Figure 3 shows a bottom view of the laser diode, 4 shows a front view of the laser diode.
[23] As shown in the drawing, in the optical pickup optical system according to the present invention, after the light emitted from the laser diode 1 passes through the grating 3 and enters the prism 4, the half disposed on one side of the prism 4. Passes through the mirror 5 and passes through the collimator lens 6 and the objective lens 7 to form the disk 9 and to the photodiode 8 disposed on the other side of the prism 4. Consists of.
[24] In the optical pickup optical system, the laser diode 1 is installed to be adjustable in position along the optical path according to the present invention. For example, an optical pickup base is formed by forming a screw thread 1a on the outer circumferential surface of the housing of the laser diode 1. It is installed to adjust the position of the laser diode (1) by screwing in.
[25] As described above, the defocusing device of the optical pickup optical system focuses on correcting the role of the correction lens as a single laser diode, and moves the correction lens by rotating the laser diode by giving a thread like a screw to the laser diode surface. The same result as that of focusing can be obtained, and the use of the screw laser diode thus makes it possible to make the optical element configuration of the pickup simpler by three-dimensional adjustment of the laser diode, which eliminates the need for correction lenses. It can have this point in time and space.
[26] When the laser diode is fixed to the optical pickup base, the laser diode may be screwed to fix the laser diode without using a bond.

权利要求:
Claims (2)
[1" claim-type="Currently amended] In the optical disc drive, the laser diode 1 of the optical pickup optical system that emits light for recording and reproducing information on the disc 9 is arranged to be adjustable along the optical path, thereby adjusting the position of the laser diode 1. A defocusing apparatus for optical pickup optics, characterized in that it is configured to adjust defocusing.
[2" claim-type="Currently amended] 2. The defocusing apparatus for optical pickup optical system according to claim 1, wherein the laser diode (1) has a thread (1a) formed on an outer circumferential surface of the housing thereof and is screwed to the optical pickup base.

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同族专利:

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公开号 | 公开日

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2003-01-23|Application filed by 엘지전자 주식회사

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2003-01-23|Priority to KR1020030004574A

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2004-07-30|Publication of KR20040067464A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020030004574A|KR20040067464A|2003-01-23|2003-01-23|Defocusing apparatus for optical system of optical pickup|