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    STRAIN CORRECTOR
    3.
    发明专利
    STRAIN CORRECTOR 失效

    公开(公告)号：JPH05134592A

    公开(公告)日：1993-05-28

    申请号：JP30050391

    申请日：1991-11-15

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： HORI TERUSHIGE ,  KOBAYASHI YUJI

    IPC: G03H1/00

    Abstract: PURPOSE:To correct a phase distortion with good responsiveness by using a compensation optical system. CONSTITUTION:Signal light (a) and reference light a' progress in the same optical path and is made incident impulsively in time division into the inside of an optical fiber 8. The signal light a1 and reference light a1' subjected to the phase distortion by passing the optical fiber 8 are branched by a variable mirror 10. The reflected signal light a1 passes a half mirror HM and is recorded together with the reference light (b) on a hologram 12. The reference light a1' reflected by the variable mirror 10 passes the half mirror HM and is recorded together with the reference light b' on a hologram 14. The respective holograms 12, 14 are simultaneously reproduced by reading out light c, c'. The signal light a. conjugate with the signal light a1 and the reference light a2' conjugate with the reference light a1' are recorded on the hologram 16. The hologram 16 is reproduced by reading out light c'' and is outputted as the original signal light subjected to the correction of the phase distortion.

    COMPENSATION OPTICAL SYSTEM
    4.
    发明专利
    COMPENSATION OPTICAL SYSTEM 失效

    公开(公告)号：JPH0580367A

    公开(公告)日：1993-04-02

    申请号：JP24347391

    申请日：1991-09-24

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： HORI TERUSHIGE ,  KOBAYASHI YUJI

    IPC: G02B5/32 ,  G02F1/35 ,  G03H1/22

    Abstract: PURPOSE:To improve the compensation optical system. CONSTITUTION:This compensation optical system is equipped with at least two phase conjugate devices, and distorted signal light is made incident on one phase conjugate device to obtain the complex conjugate signal light of the distorted signal light; and this complex conjugate signal light is made incident on the other phase conjugate device and recorded and this signal light recorded in this phase conjugate device is read out with the distorted signal light. Information exp(-iphi) which has the same wave front shape and is opposite in travel direction is obtained by phase conjugation from signal distortion represented as exp(iphi) and the phase distortion is therefore corrected (exp(iphi)*exp(-iphi)=1).

    FINGERPRINT RECOGNITION DEVICE
    5.
    发明专利
    FINGERPRINT RECOGNITION DEVICE 失效

    公开(公告)号：JPH06176134A

    公开(公告)日：1994-06-24

    申请号：JP32550892

    申请日：1992-12-04

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TOYODA HARUYOSHI ,  KOBAYASHI YUJI ,  HORI TERUSHIGE

    IPC: G06T7/00 ,  G06F15/62

    Abstract: PURPOSE:To remove noise on account of the distortion of the image of a fingerprint and to improve a recognition rate by moving or rotating a transparent body perpendicularly to the pressure-installation direction of the transparent body and to a two-dimensional direction. CONSTITUTION:A fingerprint pattern is obtained from the difference of a reflection condition when light is projected from a light source (LED) 330 to a prism 320 and a finger 301 is pressed. A lens 312 imageforms the fingerprint pattern on a CCD camera 310, and the CCD camera 310 converts the pattern into a video signal and transmits it to a recognition device 10. It frequently occurs that distortion is generated in the fingerprint pattern by the inputting method of force into the finger 301 and an attitude, and therefore erroneous recognition is liable to occur. Thus, erroneous recognition is prevented by driving stages 422, 424 and 426 and giving vibration. The recognition device 101 collates all the generated fingerprint patterns with a previously registered pattern so as to recognize them on a real time basis. When the coincident pattern exists, it is recognized to be the same or the previously registered one.

    MEASURING APPARATUS OF TWO-DIMENSIONAL PHASE INFORMATION
    6.
    发明专利
    MEASURING APPARATUS OF TWO-DIMENSIONAL PHASE INFORMATION 失效

    公开(公告)号：JPH05231951A

    公开(公告)日：1993-09-07

    申请号：JP3333392

    申请日：1992-02-20

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： KOBAYASHI YUJI ,  HORI TERUSHIGE ,  TOYODA HARUYOSHI ,  HARA TSUTOMU ,  SONE AKIHIRO ,  MATSUMOTO OSAMU

    IPC: G01B9/02 ,  G01J9/02 ,  G01M11/00

    Abstract: PURPOSE:To determine the direction of modulation of a two-dimensional light phase distribution with high precision and at a high speed. CONSTITUTION:An optical heterodyne interference device converts two-dimensional phase information into an optical heterodyne signal superposed on a prescribed carrier frequency on a time basis. A semiconductor laser 71 outputs a reference signal light repeated at a frequency having an asymmetric waveform and corresponding to the aforesaid carrier frequency. Writing in SLM 60 is made by the optical heterodyne signal and reading therefrom is made by a reference signal. In other words, overlapping of the optical heterodyne signal with the reference signal can be determined in two-dimensional parallel. Since the semiconductor laser 71 generates the reference signal light having the asymmetric waveform in this case, the amount of overlapping of the two-dimensional signal with the reference signal at each point increases and decreases in accordance with the direction of phase modulation at each point of the two-dimensional phase information inputted to an optical heterodyne interference means.

    PHASE CONJUGATE MIRROR AND LASER RESONATOR
    7.
    发明专利
    PHASE CONJUGATE MIRROR AND LASER RESONATOR 失效

    公开(公告)号：JPH04134432A

    公开(公告)日：1992-05-08

    申请号：JP25828590

    申请日：1990-09-27

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： HORI TERUSHIGE

    IPC: G02F1/35 ,  H01S3/08 ,  H01S3/108

    Abstract: PURPOSE:To offer a self-excitation type mirror with high reflectivity and laser output with sharp wave front by supplying an optical member consisting of an optical nonlinear medium, and energy which modulates the refractive index of the nonlinear medium in point of time to the optical member. CONSTITUTION:When laser oscillation is started and an argon laser beam is made incident on BTO crystal 41, the distribution of the refractive index is modulated in the crystal of the BTO crystal 41 by the strong nonlinearity of the beam. At this time, light in the BTO crystal 41 receives frequency modulation less than 1Hz, and the reflectivity as a phase conjugate mirror is increased due to the passive frequency shift of the light. In addition to that, the time modulation of an index grating comprised in the inside of the BTO crystal 41 is performed by applying the time modulation of an electric field applied from a power source 43 to the BTO crystal 41 via electrodes 42a, 42b, and applying the time modulation of the refractive index corresponding to the time modulation. Thereby, it is possible to realize the remarkable improvement of reflectivity.

    SPATIAL FOURIER TRANSFORMER
    9.
    发明专利
    SPATIAL FOURIER TRANSFORMER 失效

    公开(公告)号：JPH06175182A

    公开(公告)日：1994-06-24

    申请号：JP32551392

    申请日：1992-12-04

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： KOBAYASHI YUJI ,  TOYODA HARUYOSHI ,  HORI TERUSHIGE

    IPC: G02F3/00 ,  G06K9/00

    Abstract: PURPOSE:To reduce the degradation of contrast and to decrease the intensity of a correlation signal caused by a component due to the shape of a mask by providing a mask passing through the part of shapes giving a small mutual correlation among the patterns on the input side of the pattern. CONSTITUTION:A mask passing through the part of shapes giving small mutual correlation (e.g. a circle and a triangle, squares inclined to each other, etc., the sides of the shapes do not be come parallel by parallel translation so as to mutually superimpose, in particular, the object with blurred edge is desirable.) among the patterns is provided on the input side of the pattern. The mask preferably have a shape corresponding to the size of the pattern. Namely, this device is composed of lenses 121-124, SLMs 110, 112, and a filter 114, etc., and especially provided with an aperture 102 on the input side of the SLM 110. The aperture 102 is fixedly arranged on the position corresponding to the positions of an input image and a reference image and formed in the shape that gives small mutual correlation.

    10.
    发明专利
    失效

    公开(公告)号：JPH05333364A

    公开(公告)日：1993-12-17

    申请号：JP16218892

    申请日：1992-05-27

    Applicant: HAMAMATSU PHOTONICS KK ,  NIPPON TELEGRAPH & TELEPHONE

    Inventor： KOBAYASHI YUJI ,  YOSHIDA NARIHIRO ,  KOSAKA NAOHISA ,  HORI TERUSHIGE ,  FUKUSHIMA SEIJI

    IPC: G02F1/135 ,  G02F1/133

    Abstract: PURPOSE:To provide the spatial light modulation device which can repeatedly perform write operations plural times while keeping the satisfactory resolution of a spatial light modulation element. CONSTITUTION:This ferroelectric liquid crystal spatial optical modulation device 10 is provided with a ferrorelectric spatial light modulation element (FLCSLM) 1, driving power source 2 and polarity inverting controller 3 connected to the driving power source 2. According to a cycle Ts of a control operation S, the polarity inverting controller 3 inverts and controls the polarities of a write driving voltage Vw, write compensating voltage Vwc, erase driving voltage Ve and erase compensating voltage ec impressed from the driving power source 2 to the FLCSLM 1. Therefore, the polarities of the Vw, Vwc, Ve and Vec are inverted at every control operation S. Thus, the storage of charges in the FLCSLM 1 can be suppressed and even when the control operations are repeatedly performed, the resolution of a write pattern can be prevented from being degraded.

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