• 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:
    An optical scanning system including a spinner (3) containing at least one plane linear diffraction grating (2). As the spinner'is rotated, a plane reconstruction wavefront (20) of wavelength λr is directed onto the grating creating a diffracted wavefront (21) which can be focused onto an image plane (25). The grating is constructed so that the ratio of the reconstruction wavelength λr to the grating period d is a value lying between the range of 1 and 1.618. The angles of incidence and diffraction of the reconstruction wavefront in a preferred embodiment, approximates 45°.
    公开号:SU999989A3
    申请号:SU802917253
    申请日:1980-05-06
    公开日:1983-02-23
    发明作者:Дж.Крамер Чарльз
    申请人:Ксерокс Корпорейшн (Инопредприятие)；
    IPC主号:
    专利说明:

    (54) OPTICAL SCANNING SYSTEM The invention relates to optical scanning devices. A scanning device is known in which a plate data is placed on a rotating disk l i However, this device has a bend in the scanning line, which can be corrected with additional optics, but such systems are difficult to adjust. Closest to the proposed SIB optical scan system containing a light source mounted at an angle to the plane of the rotating disk, which is equipped with a set of linear diffraction gratings with a constant period of G 21, A disadvantage of the known device is the distortion of the output sweep due to the effect of eccentricity of the rotating disk in the facet-grids, cinform-like disk and illumination of non-uniformity, either existing within the scan line (caused, for example, by the presence of a spike in the regenerating moon), or from line to line (caused by differences between the grids). The aim of the invention is to increase the scanning efficiency. This goal is achieved by the fact that the ratio of the wavelength of the light source to the grating period is in the range from 1 to 1.618, the angle between the normal to the plane of the rotating disk and the optical axis of the light source is selected by the short-circuit limit P-89, 445, and the diffraction angle of the grating is within from 38 to 90, the angle between the normal to the plane of the rotating disk and the optical axis of the light sources and the diffraction angle of the lattice are subject to the dependencies Si & i Ar / - fr 51 at-a / xc, where & - the angle between the normal to the plane of the rotating disk and the optical axis of the light source; b j - grating diffraction angle; - lattice period; D. - Dpiva wave source of light. The angle between the normal to the plane of the rotating disk and the diffraction angle of the lattice are subject to the dependences 51 and 0 - С | а-а | Лг) 5с% and 91и0 (.1-5ses) + | - Doo where & n is the angle of rotation of the rotating disk . FIG. 1 shows a flat linear diffraction grating made on the surface of a transmitting type rotator, side view; in fig. 2nd, top view; in fig. 3 — A preferred system for creating a diffraction grating using a prism; in fig. 4 disk (shown in Fig. 2) in recovery mode; in fig. 5 is a diagram of the scanning system; in fig. 6 is a graphic image of the deviation of the bend of the scanning line as a function of the angle of the grating rotated at different values of the angle of incidence and diffraction; in fig. 7 is a block diagram illustrating a scanning system with an exposure error correction circuit. Creating a holographically on the surface of a transfer type rotator of a single-plane facet 1 of a linear diffraction grating is illustrated in FIG. 1, where a rotating disk 2 is depicted. Facet 1 is formed by directing the subject wave front 3 and reference wave front 4, with flat waves lying in the same plane, onto the recording medium 5 deposited on the surface of the disk 2. It is assumed that these The rays were first split and processed separately (spatially filtered, arranged in a parallel beam) before creating the necessary wave fronts. The lattice lines (Fig. 2) are made perpendicular with respect to the axes of the line 6 of the rotator. The choice of medium 5 is determined primarily by the decision to record lines of interfering wave fronts. As is well known, disk 2 can be labeled so that multiple facets 1 can form on its surface. For the transmitting grating (Fig. 2), the distance between the interfacing p1M1os (shown with a strong 9894 magnification) is given by the diffraction grating equation 51i ((11p where f is the wavelength of the forming wavefront, fdI f are the angles of the object and reference waves with a normal to the recording medium, respectively. Both beams lie in a plane defined by the normal and rotational diameter. Figure 4 shows a disk 2 (shown in Fig. 2 and 3) located in the XY plane and rotating about axis 2. The restoring wave front 7 falls on facet 1 at an angle of incidence Q, and diffracted at a diffraction angle to ensure that the angle of rotation and parallelism of the diffraction lines of facet 1 to X are zero and the incident and diffracting rays satisfy the following the general equation 5ivi (3-sin-Q ,, 2). SwQi i-b Sineav / 3c | 5 ®R, where Ш-Shb uI 51Y10, are the components of the recovery wave vector. respectively along the X and Y axes; 51I b (;) Sin & vj are the components of the vector of the diffracted wave along the X and Y axes; ) is the wavelength of the restoring beam; d is the period of the diffraction grating; © p - angle of rotation. FIG. 5 shows the scanning system using the transfer disc shown in FIG. 2-4. The restoring wave front 7 falls on the rotator at an angle & and diffracted at an angle Q. Since wavefront 7 is a plane wave, the diffracted wave 8 is also a flat, fsusive lens 9: the mirror 10 directs the signal beam 11 to the image plane 12, which lies in the focal plane of the lens 9. When the disk is rotated, the signal beam 11 shifts vertically (Fig. 5) by constructing a single scanning line. As the additional facets rotate by means of the wavefront 7, additional outlet lines are generated. The diffracted beam contains components of both the first and, for example, zero order. This component of the zero order is spatially stable and has a power P comparable to the power P of the restoring front 7 of the feed to the diffraction grating (Fig. 7). FIG. 7 shows a correction scheme for the mode of a transmitting rotator, but the method described below can equally well be used for reflecting holograms. As shown in (| ", g. 7, the correction signal is obtained as a function of the rotation angle of the holographic disk 2). The laser modulator 13 is designed to suppress the power of the beam P proportional to the power of the incident laser beam and set the input voltage E (- fc) modulator, E (-t) being maintained within the interval for linear operation.Part of the power of the beam P from the modulator is diverted by the junction mirror 14 to the light detector 15, the signal of which is proportional to P. P. zero-order beam is allocated by means of the light detector 16 for generating a signal proportional to P0 (p is a constant of proportionality). The amplifiers 16.A17 adjust 11 s so that the output of the proportionality circuit 18 following them is R / P. The IQ / P ratio is a function of the angular position due to variations of the intra-facet and inter-facet diffraction coefficient, this ratio is related to the local diffraction coefficient T) g of the holographic diffraction grating by the equation, .. Bii.4H.M () PW, vr if necessary, simulate the production a constant but constant diffraction coefficient 3) eq, so that the power of the scanning beam is not exposed to small local changes D the correction factor M (9), equal to (5) and in electronic form is introduced into the circuit, 19 memorization and machining. The correction factor M (©) is multiplied in multiplier 20 by means of an input video signal E in order to provide & no power of the scattering beam proportional to the video signal E, independent of the local diffraction coefficient. The scanning system offered is possessed by the inoculation characteristics that remain almost constant with relative changes in the orientation of the arresting beam. These characteristics contain a practically non-curved scanning trajectory; invariance to rotational alignment errors; insensitivity to angular displacements of the axes of the rotator; the speed is created either holographically or by means of a conventional dotted diffraction grating and simple oscillation conversion. F, Shadow Formula 1. An optical scanning system comprising a light source mounted at an angle to the plane of a rotating disk equipped with a set of linear diffraction gratings with a constant period, in order to increase the scanning efficiency, the ratio of the wavelength of the source light to the lattice period is in the range from 1 to 1.618, the angle between the normal to the plane of the rotating & disk drive and the optical axis of the light source is chosen from the limit of 0-89,445, and the diffraction angle of the lattice ranges from 38, 17 to 90. 2. The system according to claim 1, characterized in that the angle between the normal to the plane of the rotating disk and the optical axis of the light source and the grating diffraction angle are subject to the following dependence SIM ©; - Xy-ia-dlXvSwe-d 1 pce - angle between the normal to the flatness of the rotating disk and the optical axis of the light source; grating diffraction angle; (3 is the lattice period; D, W. is the wavelength of the light source. 3. The system in accordance with claim 1, characterized in that the angle between the normal to the plane of the rotating disk and the diffraction angle of the lattice are connected by the following decay siyie - ( Sin © a- 0) -aixv-r
    where j is the utopian rotation
    Sources of information taken into account in the examination
    9999898
    1, US Patent No. 39531О5, cl. 350-7, published. 04/27/76.
    2. Patent CLLA No. 4О6739,
    1CL 35O-6, pub. 1O.O1.76 (prototype).
    but
    Fi.2 11 F1lg.5 p
    权利要求:
    Claims (3)
    [1]
    F; about r m at l of invention
    1. An optical scanning system containing a light source mounted at an angle to the plane of a rotating disk equipped with a set of linear diffraction gratings with a constant period, characterized in that, in order to increase scanning efficiency, the ratio of the wavelength and light source to the period of the grating is within from 1 to 1.618, the angle between the normal to the plane of the rotating disk and the optical axis of the light source is selected from the limit of 0-89.445®, and the diffraction angle of the grating is in the range from 38, 17 * to 90 °.
    [2]
    2. Pop system. 1, characterized in that the angle between the normal to the plane of the rotating disk and the optical axis of the light source and the diffraction angle of the grating are subordinated to the following | <3-in | λ-r
    - d | A Г ι where 6 ^ is the angle between the normal to the flatness of the rotating disk and the optical axis of the light source;
    grating diffraction angle;
    (3 - lattice period;
    D, y. - wavelength of the light source.
    [3]
    3. The system according to π. Ϊ, characterized in that the angle between the normal to the plane of the rotating disk and the diffraction angle of the grating are connected as follows:
    sin © s - (A) d cl - s | I λ d) se with Qr G-sec
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    Shakher et al.1990|Dependence of diffraction efficiency of holographic concentrators on angle of illumination, hologram-thickness and wavelength of illuminating light
    US4461533A|1984-07-24|Forming and reading holograms
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    同族专利:
    公开号 | 公开日
    EP0020076B1|1983-05-18|
    CA1121625A|1982-04-13|
    US4289371A|1981-09-15|
    EP0020076A1|1980-12-10|
    DE3063279D1|1983-07-07|
    JPH0335647B2|1991-05-29|
    JPS55161211A|1980-12-15|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/044,000|US4289371A|1979-05-31|1979-05-31|Optical scanner using plane linear diffraction gratings on a rotating spinner|
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