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1. 发明专利

JPS6318533A LENS FOR OPTICAL DISK PICKUP 失效
公开(公告)号：JPS6318533A
公开(公告)日：1988-01-26
申请号：JP16170786
申请日：1986-07-09
申请人： HAMAMATSU PHOTONICS KK , NIPPON COLUMBIA
发明人： HARA TSUTOMU , KOBAYASHI YUJI , OI YOSHIHARU , OSUMI YASUTSUGU , SUZUKI YOSHIJI , TAKAGI TOSHIHIKO
IPC分类号： G11B7/09 , G02F1/03 , G11B7/135
摘要： PURPOSE:To lighten and simplify the constitution of a moving part of the titled pickup and to shorten access time by providing, to a lens part, a lens having a member made of a material which varies its refractive index and mechanically deforms by an external signal. CONSTITUTION:The objective lens part is provided with a lens having the member made of the material which varies its refractive index or mechanically deforms due to an external signal. For instance, the objective lens part 30 is constituted integrally of a microlens 31 made of glass or plastic, a lens 32 of variable focal length, and an optical beam deflector 33 that are combined with each other. Normally, for a pickup device for a compact disk, a lens whose focal length is, f=5mm approximately, is used and the focus control needs to be performed within a range of 1mm. Therefore, a microlens 31 whose focal length f0=5mm is used in combination with the lens 32 and the focal length of the lens 32 is set at 20mm in order that the combination of the lenses 31 and 32 gives a focal distance of, f=4mm, i.e. the focal distance (f) is made shorter by 1mm.

2. 发明专利

JPS62293523A LASER PICKUP DEVICE FOR OPTICAL DISK 失效
公开(公告)号：JPS62293523A
公开(公告)日：1987-12-21
申请号：JP13751986
申请日：1986-06-13
申请人： HAMAMATSU PHOTONICS KK , NIPPON COLUMBIA
发明人： HARA TSUTOMU , KOBAYASHI YUJI , OI YOSHIHARU , OSUMI YASUTSUGU , SUZUKI YOSHIJI , TAKAGI TOSHIHIKO
IPC分类号： G11B7/09
摘要： PURPOSE:To attain very quick accessing by extracting the change in a reflected light from a disk obtained through a micro lens as the stimulated change of a semiconductor laser from a photodetector. CONSTITUTION:An output light from a semiconductor laser 7 is projected onto a disk 1 via a micro lens 20 and its reflected light is returned to the laser 7 through the lens 20 and the fiber 21 again. In increasing/decreasing the returned luminous quantity depending on the state of a disk face, the excited luminous quantity of the semiconductor laser is increased/decreased and a terminal voltage is changed and a signal is detected by the self-coupling effect. A moving part integrated in a head feeder 2 is only the micro lens 2, which offers light weight and focusing/tracking control is applied by using a signal from the servo circuit 6, and the control is applied by using the wobbling method that minute vibration is applied to the projected beam to the optical disk 1 and the relation of phase between the reflected light intensity of spot and the vibration in this case is detected.

3. 发明专利

JPS63133687A CRYSTAL SEALING CASE OF VARIABLE WAVELENGTH LASER DEVICE 失效
公开(公告)号：JPS63133687A
公开(公告)日：1988-06-06
申请号：JP28127086
申请日：1986-11-26
申请人： HAMAMATSU PHOTONICS KK
发明人： URA TADAHISA , SUZUKI HIDEO , OSUMI YASUTSUGU , MORITA NOBUHIRO , MATSUMOTO OSAMU , KOBAYASHI YUJI , OBAYASHI YASUSHI
IPC分类号： H01S3/108 , G02F1/39
摘要： PURPOSE:To prevent displacement of output laser beam position by changing an angle formed by the optical axis of laser beam and optical axis through formation of curved external surface of window for inputting or outputting laser beam of device including an arc centered to the intersecting point of the optical axis of nonlinear optical crystal and optical axis of laser beam. CONSTITUTION:A nonlinear optical crystal 11 and a case 12 for sealing the crystal 11 are formed integrally and wavelength of laser beam 25a emitted is changed by changing an angle formed by the optical axis 26 of laser beam 25 incident to the non-linear optical crystal 11 and optical axis of the nonlinear optical crystal 11. In this waveform variable laser device, the external circumference of windows 21, 22 for inputting and outputting laser beams 25, 25a of case 12 is formed as the curved surface including the arc centered at the intersecting point of the optical axis of nonlinear optical crystal 11 and optical axis 26 of laser beam 25. The external circumference of windows 21, 22 for inputting and outputting laser beams 25, 25a of the case 12 is formed, for example, in cylindrical having the center axis of the rotating axis 13 of case 12, or formed as the spherical surface centered on the intersecting point of the rotating axis 13 of case 12 and the optical axis 26 of the laser beam 25.

4. 发明专利

JPS6275944A OPTICAL INFORMATION RECORDING MEDIA AND ITS WRITING/ READING METHOD 失效
公开(公告)号：JPS6275944A
公开(公告)日：1987-04-07
申请号：JP21384685
申请日：1985-09-27
申请人： HAMAMATSU PHOTONICS KK
发明人： OSUMI YASUTSUGU , KOBAYASHI YUJI
IPC分类号： G11B7/00 , B41M5/26 , G11B7/004 , G11B7/24
摘要： PURPOSE:To read and write to an optical information recording media and the media to satisfy the request for increasing in a recording information quantity by arranging >=2 heat modes recording media which sandwiches the isotropic media and different in polarizing direction. CONSTITUTION:The laser beam of a laser diode 21A is made thin through a half mirror 24 and a lens system 25, and polarizing films 11A and 11B of a substrate 10 are irradiated to optical information recording media 1 stuck orthogonally in the deflecting direction. A film 11B surface is quickly heated, at such a time, the hole is formed at the optical beam spot part, changed so as to pass through the light, the signal is recorded, and on the other hand, at the film 11A, the optical beam energy is transmitted and remains as it does. In the same way, the film 11B remains by a laser diode 21B, the hole of the film 11A is opened and through the light, the polarizing component of the film 11B remains. Thus, by making the hole on films 11A and 11B surfaces, the information can be selectively recorded on two surfaces.

5. 发明专利

JPH01178938A OPTICAL PARAMETRIC OSCILLATOR 失效
公开(公告)号：JPH01178938A
公开(公告)日：1989-07-17
申请号：JP33371287
申请日：1987-12-29
申请人： HAMAMATSU PHOTONICS KK
发明人： SUZUKI HIDEO , OSUMI YASUTSUGU , MORITA NOBUHIRO , MATSUMOTO OSAMU , KOBAYASHI YUJI , OBAYASHI YASUSHI
IPC分类号： G02F1/39
摘要： PURPOSE:To vary the angle of the optical axis of exciting light to the optical axis of nonlinear optical crystal and to vary the output wavelength of oscillation light at a high speed by deflecting the exciting light by an optical deflector which utilizes the optoelastic effect of an optical material. CONSTITUTION:When specific electric power is supplied to the oscillator 13 of the optical deflector 10 and its oscillation frequency is varied within a specific range, the exciting light 5a changes its traveling direction and is deflected into exciting light 5b. Consequently, the light is reflected and converged by one focusing mirror 16, the angle ph of phase matching between the optical axis 19 of the exciting light 5b entering the nonlinear optical crystal 3 through an incidence mirror 14 and the optical axis 8 of the nonlinear optical crystal 3 varies, and the oscillation light 18 projected through a projection mirror 15 varies in wavelength corresponding to said variation. This utilizes the optoelastic effect of the optical material such as acoustooptic effect and electrooptic effect. Consequently, the deflecting speed of the exciting light 5a is increased to facilitate fast variation in the output wavelength of the oscillation light 18 and also eliminate the need for a crystal rotational mechanism.

6. 发明专利

JPS63185084A OPTICAL WAVELENGTH TUNABLE LASER APPARATUS 失效
公开(公告)号：JPS63185084A
公开(公告)日：1988-07-30
申请号：JP1754687
申请日：1987-01-28
申请人： HAMAMATSU PHOTONICS KK
发明人： KOBAYASHI YUJI , OBAYASHI YASUSHI , SUZUKI HIDEO , OSUMI YASUTSUGU , MORITA NOBUHIRO , MATSUMOTO OSAMU
IPC分类号： H01S3/10 , G02F1/39 , H01S3/109
摘要： PURPOSE:To obtain an optical wavelength tunable laser without the large rotary angle of a crystal for an optical wavelength converter, by providing a second optical parametric oscillator having a specified function on the incident side of the optical wavelength converter. CONSTITUTION:When a crystal 6a for a first optical parametric oscillator (OPO) is excited with pumping lights, normal light and anomalous light are emitted when the angle (theta) of the crystal 6a is 90 degrees. Of the output light of the first OPO 1a, the pumping light is inputted into a 1/2 wavelength plate 27, and the direction of the polarized light is turned by 90 degrees. A crystal 6b for a second OPO 1b is provided at a position, which is orthogonally intersected with the crystal 6a for the first OPO. Therefore the pumping light becomes the normal light with respect to the crystal 6b for the second OPO. The phase is aligned with respect to the turning direction in a vertical plane. The signal light and the idler light, whose polarizing directions are orthogonally intersected with the output light of the first OPO 1a, are outputted. The output light from the first OPO 1a and the output light from the second OPO 1b are combined and inputted into an SHG 2. Then the normal light within a specified range with respect to a crystal 9 for the SHG is obtained. Said normal light becomes a wavelength tunable laser beam by the rotation of the crystal 9 for the SHG by 50-90 degrees.

7. 发明专利

JPS63170619A OPTICAL PARAMETRIC OSCILLATOR 失效
公开(公告)号：JPS63170619A
公开(公告)日：1988-07-14
申请号：JP255287
申请日：1987-01-08
申请人： HAMAMATSU PHOTONICS KK
发明人： KOBAYASHI YUJI , OBAYASHI YASUSHI , SUZUKI HIDEO , OSUMI YASUTSUGU , MORITA NOBUHIRO , MATSUMOTO OSAMU
IPC分类号： G02F1/39 , G02F1/35 , G02F1/355 , G02F1/361
摘要： PURPOSE:To obtain a wavelength variable laser beam with high efficiency, and also, a stable oscillation, by enclosing a non-linear optical crystal so as to be turnable in a container, changing the incident angle of an excited light to a crystal axis by turning only this enclosed non-linear optical crystal, and changing the wavelength of an oscillation light. CONSTITUTION:A third harmonic laser beam (wavelength lambdap=355nm) of an Nd-YAG laser is inputted as the excited light 35, an oscillation light 36 consisting of a signal (wavelength lambdas) and an idler (wavelength lambdai) is generated by an optical parametric oscillation. When the incident angle of the excited light 35 to a crystal axis is changed by turning a non-linear optical crystal 24 around the center axis 37 in the direction as indicated with an arrow by driving a stepping motor 14, the wavelengths (lambdas, lambdai) of the oscillation light 36 are changed continuously within a prescribed range (for instance, 500-1,230nm). In such a way, a distance between mirrors 31, 32 (cavity length) can be made as short as possible, and a stable oscillation light can be obtained with high efficiency.

8. 发明专利

JPS63159832A WAVELENGTH VARIABLE LASER DEVICE 失效
公开(公告)号：JPS63159832A
公开(公告)日：1988-07-02
申请号：JP31007386
申请日：1986-12-24
申请人： HAMAMATSU PHOTONICS KK
发明人： SUZUKI HIDEO , OSUMI YASUTSUGU , MORITA NOBUHIRO , MATSUMOTO OSAMU , KOBAYASHI YUJI , OBAYASHI YASUSHI
IPC分类号： H01S3/10 , G02F1/39 , H01S3/108
摘要： PURPOSE:To simultaneously output two laser beams of independent and variable wavelength by providing two optical parametric oscillators along the optical axis of an excitation light, and controlling the rotary angle of each non-linear optical crystal. CONSTITUTION:When a wavelength selecting signal is sent out to optical parametric oscillators 24, 25 through lines l1, l2 from a wavelength selecting circuit 45, the rotary angle of rotary shafts 30 and 32, and that of 40 and 42 are controlled to a prescribed angle respectively, and a phase matching angle of a non-linear optical crystal 31, and that of a non-linear optical crystal 41 are set to theta1 and theta2, respectively. Therefore, the oscillator 24 oscillates an optical parametric by the excitation light 22 of wavelength lambdap from a laser oscillator 21, and outputs the light beam 47 of lambda1s and lambda1i. Also, the oscillator 25 uses the transmission light of wavelength lambdap contained in the light beams 47, as an excitation light, executes a parametric oscillation through a collimator lens 37, and outputs the light beams 48 of wavelength lambda2s and lambda2i corresponding to the angle theta2. Also, in the output side of a filter 26, the light beams 49 of wavelength lambda1s and lambda2s appear simultaneously.

9. 发明专利

JPS62148391A PRODUCTION ON HIGH-MELTING POINT SUBSTANCE CRYSTAL AND VESSEL OF MATERIAL USED IN SAID PRODUCTION 失效
公开(公告)号：JPS62148391A
公开(公告)日：1987-07-02
申请号：JP28715385
申请日：1985-12-20
申请人： HAMAMATSU PHOTONICS KK
发明人： OSUMI YASUTSUGU
IPC分类号： C30B15/00 , C30B29/22 , C30B29/26
摘要： PURPOSE:To highly purify the titled crystal by using the powder of the material of a crystal to be produced to form a block, using the molten part formed by partially heating the central part of the upper surface of the block to pull the crystal, and using the unmelted part as the vessel of the molten part. CONSTITUTION:The high-m.p. substance crystal, is produced by the following three stages. Namely, the powder of the crystal to be produced is densely compressed to prepare the block 1 in the first stage, the central part of the upper surface of the block 1 is heated by a heating means to form the molten part 2 in the second stage, and the crystal 3 is pulled by using a seed crystal while keeping the molten state by the heating means in the third stage. The central part of the upper surface of the block 1 of powder is concentratedly heated to melt only the heated part, and a laser device is preferentially used as the means for maintaining the molten state.

10. 发明专利

JPS61234311A CYLINDRICAL COLUMN TYPE LASER GYROSCOPE 失效
公开(公告)号：JPS61234311A
公开(公告)日：1986-10-18
申请号：JP7579285
申请日：1985-04-10
申请人： HAMAMATSU PHOTONICS KK
发明人： OSUMI YASUTSUGU , KATO TAKAHITO
IPC分类号： H01S3/083 , G01C19/00 , G01C19/64 , G01C19/66 , G01C19/72
摘要： PURPOSE:To construct a highly sensitive and compact gyroscope with gyroscope proper equipped with an optical reflecting surface made of a circular cylinder surface on the outer periphery of a transparent optical material and with a surface on which laser in incident on and from which laser goes out a laser oscillator and a phase-difference detector. CONSTITUTION:A gyroscope proper 1 is constructed with transparent quartz and on the outside of the outer periphery of a circular cylinder, for instance, aluminium reflecting film 1a reflecting light at high efficiency is covered. Further, on the gyroscope proper 1, a clockwise incident surface 1b and a counterclockwise incident surface 1c are installed. A beam of light irradiated from the surface 1b and emitted out of the surface 1c is detected by the clockwise irradiated light detectors. The result of detection is compared with a calculator 6 and acceleration applied to the gyroscope is fed out as an output. Thus, a highly accurate and compact gyroscope can be constructed.

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