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1. 发明专利

JPS5883340A CONTROLLER FOR LUMINOUS FLUX POSITION 失效
公开(公告)号：JPS5883340A
公开(公告)日：1983-05-19
申请号：JP17322982
申请日：1982-10-04
申请人： HITACHI LTD
发明人： SAWANO SUSUMU
IPC分类号： G02B7/28 , G11B7/09 , G11B7/095
摘要： PURPOSE:To control a luminous flux position with high precision while eliminating interference disturbance to focus control even while track follow-up control is carried out in combination, by setting the rotating shaft of a rotary mirror for luminous flux deflection off an optical axis closely to the rear-side focal plane of an objective practically. CONSTITUTION:When a rotary mirror 13 is turned at theta while its axis is set at the rear-side focus F0 of an objective 14, incident luminous flux 30 is deflected by 2theta and focused on a disk 22 as shown by a light spot 31' through the objective 14. Since the rotating shaft of the mirror is on the focus of the objective 14, the optical axis of the incident luminous flux passing through the focus is at right angles to the disk, and the reflected luminous flux by the disk travels backward through the same path with the incident luminous flux. In practice, as the rotating shaft of the mirror is put closer to the rear-side focal plane of the objective, interference disturbance to focus control by track follow-up control, etc., is reduced to perform high-precision luminous flux position contorl.

2. 发明专利

JPS5269307A INFORMATION REPRODUCTION DEVICE 失效
公开(公告)号：JPS5269307A
公开(公告)日：1977-06-09
申请号：JP14399375
申请日：1975-12-05
申请人： HITACHI LTD
发明人： OSHIDA YOSHISADA , SAWANO SUSUMU
IPC分类号： H04N5/85 , G02B27/00 , G11B7/125
摘要： PURPOSE:To make possible the good reproduction over the entire region of discs by discs by changing the spot size on the tracks of a radiation laser light according to the disc position in a reproduction device using photovideo discs, etc.

3. 发明专利

JPS61143716A OPTICAL SYSTEM FOR CORRECTION BY LIGHT BEAM SCANNING 失效
公开(公告)号：JPS61143716A
公开(公告)日：1986-07-01
申请号：JP24403285
申请日：1985-11-01
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KATAOKA KEIJI , SAWANO SUSUMU , KOJIMA RYOJI
IPC分类号： G02B26/12 , G02B26/10 , H04N1/04 , H04N1/113
摘要： PURPOSE:To improve the effect of correcting face inclination by providing the 1st optical system which makes incident the luminous flux in parallel approximately with a scanning direction on the reflecting surface of a beam scanner and the 2nd optical system which focuses the luminous flux deflected by the beam scanner onto the scanning plane. CONSTITUTION:The 1st optical system consists of cylindrical lenses 8, 9 having respectively focal lengths f1, f2 and makes incident the parallel luminous flux of the shape long in the scanning direction and short in the direction perpendicular to the scanning direction on the reflecting surface of a rotary polyhedral mirror 2. There is therefore no change in the focusing state of the spot on the scanning plane and the good spot image is obtd. even if the reflecting surface rotates. Laser light 3-5 emitted from the rotary polyhedral mirror passes through an ftheta lens 11 and a cylindrical lens 10 and forms the image near the origin of the (y) direction on a photosensitive body 12. The laser light is stopped down to about y=f3phi by disposing the lens 10 to the position apart approximately by f3 from above the photosensitive body if the laser light is emitted in the direction of the optical axis with angle phi like 3-6 owing to the face inclination of the rotary polyhedral mirror. The effect of correcting the face inclination is thus improved.

4. 发明专利

JPS5319807A LUMINOUS FLUX FOCUS CONTROLLER 失效
公开(公告)号：JPS5319807A
公开(公告)日：1978-02-23
申请号：JP9400176
申请日：1976-08-09
申请人： HITACHI LTD
发明人： SAWANO SUSUMU , TSUNODA YOSHITO , MAEDA TAKESHI
IPC分类号： G02B7/28 , G11B7/08 , G11B7/09
摘要： PURPOSE:To compensate the disturbance based on the movement of a light spot on a photo detector by making out the differential signal between the square of the X-axis differential component and the square of the y axis differential component of the photo detector.

5. 发明专利

JPS5255547A OPTICAL INFORMATION READER 失效
公开(公告)号：JPS5255547A
公开(公告)日：1977-05-07
申请号：JP13046475
申请日：1975-10-31
申请人： HITACHI LTD
发明人： OSHIDA YOSHISADA , SAWANO SUSUMU
IPC分类号： G02B27/00 , G02B27/02 , G11B7/08 , G11B7/125
摘要： PURPOSE:In reading information from an optical information recording is intended to increase a signal-to-noise ratio throughout the overall area of a track by changing the shape of an irradiating beam in response to the position of the beam on the recording medium and the distance from it to the central point.

6. 发明专利

JPS5249851A OPTICAL DEVICE 失效
公开(公告)号：JPS5249851A
公开(公告)日：1977-04-21
申请号：JP12575575
申请日：1975-10-18
申请人： HITACHI LTD
发明人： KATAOKA KEIJI , SAWANO SUSUMU , MIYAMURA YOSHINORI , KAMIYANAGI KIICHI , SAITOU SUSUMU , HASHIMOTO AKIRA , KOUMOTO MASATO , ARIMOTO AKIRA
IPC分类号： G02B26/10 , B41J2/44 , G02B5/09 , G03G15/04 , H04N1/113
摘要： PURPOSE:To obtain lader record of good quality having less distortion by providing the reflecting surface of a rotating polyhedral mirror for polarizing a flux of light, from which laser light is relected, with a concave surface different from a plane surface.

7. 发明专利

JPS5269306A INFORMATION REPRODUCTION DEVICE 失效
公开(公告)号：JPS5269306A
公开(公告)日：1977-06-09
申请号：JP14399475
申请日：1975-12-05
申请人： HITACHI LTD
发明人： OSHIDA YOSHISADA , SAWANO SUSUMU
IPC分类号： H04N5/85 , G02B27/00 , G11B7/125
摘要： PURPOSE:To perform good reproduction free from waveform distortion over the entire disc region by changing the width of a disc radiation laser beam so that the width becomes larger on the inside circumference, in a reproduction device, etc. using photo video discs.

8. 发明专利

JPS5234750A LASER RECORDER 失效
公开(公告)号：JPS5234750A
公开(公告)日：1977-03-16
申请号：JP11005575
申请日：1975-09-12
申请人： HITACHI LTD
发明人： KATAOKA KEIJI , TAKEDA KASUSHI , YAMAMOTO MANABU , SAITOU SUSUMU , KAMIYANAGI KIICHI , ARIMOTO AKIRA , SAWANO SUSUMU
IPC分类号： G02B26/12 , B41J2/44 , B41M1/42 , G02B27/00 , G03G15/04 , G06K15/12
摘要： PURPOSE:In a laser recorder which permits modulated laser light rays to enter a photosensitive substance through a rotating polyhedral mirror, it is intended to heighten the recording speed by disposing a cylindrical lens between said rotating polyhedral mirror, and a photomodulator and said photosensitive substance.

9. 发明专利

JPS53136995A DISCHARGE DEVICE 失效
公开(公告)号：JPS53136995A
公开(公告)日：1978-11-29
申请号：JP5117977
申请日：1977-05-06
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAITOU SUSUMU , HASHIMOTO AKIRA , ARIMOTO AKIRA , SAWANO SUSUMU
IPC分类号： H01S3/036 , H01S3/03
摘要： PURPOSE:To eliminate the leak loss of He gas through the discharge tube wall for a gas laser discharge device, to suppress the discharge of the impure gas by use of a high heat-resistance material, and thus to simplify the overall structure as well as to increase the life time and the reliability.

10. 发明专利

JPS53128295A METAL VAPOR LASER 失效
公开(公告)号：JPS53128295A
公开(公告)日：1978-11-09
申请号：JP4266177
申请日：1977-04-15
申请人： HITACHI LTD
发明人： KAMIYANAGI KIICHI , KATAOKA YOSHIKAZU , SAITOU SUSUMU , SAWANO SUSUMU
IPC分类号： H01S3/03
摘要： PURPOSE:To reduce output change owing to atmospheric variations by providing a heat shield plate between the effuser part of the discharge tube of a metal vapor laser and its capillarly part for discharging, and providing a shield plate also to the effuser part of case covers.

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