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51. 发明专利

JP2002025099A OPTICAL HEAD DEVICE 失效
公开(公告)号：JP2002025099A
公开(公告)日：2002-01-25
申请号：JP2000206922
申请日：2000-07-07
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： TAKEDA TADASHI
IPC分类号： G02B5/18 , G02B5/30 , G11B7/125 , G11B7/127 , G11B7/135 , G11B7/1362 , G11B7/1367 , G11B7/1381 , G11B7/1395
摘要： PROBLEM TO BE SOLVED: To provide a small and inexpensive optical element for light guiding for a double wavelength optical head device used for aligning the optical axis of each laser beam and guiding each laser beam to a common photodetector. SOLUTION: In the double wavelength optical head device 1, the optical element 5 to guide a first and second laser beams L1 and L2 whose optical axes are deviated to the common photodetector 13 consists of a resin molding and provided with a discoid main body 51, an incident plane 52 formed so as to have one stepped surface and a flat light-emitting surface 53 perpendicular to an optical axis 5a formed on the other surface. The difference in level of the adjacent stepped surface 54 which constitutes the stepped surface of the incident plane 52 is one wavelength of optical path difference only when a return laser beam Lr1 passes. The return laser beam Lr1 passes the element 5 without being deflected in the traveling direction. A return laser beam Lr2 is deflected at a prescribed angle when passing the optical element 5 for light guiding, and condensed on the same position as that of the return laser beam Lr1 on the common photodetector.

52. 发明专利

JP2001338432A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001338432A
公开(公告)日：2001-12-07
申请号：JP2000155358
申请日：2000-05-25
申请人： PIONEER ELECTRONIC CORP
发明人： MIURA AKIRA , SUZUKI YOSHIHARU
IPC分类号： G02B5/08 , G11B7/00 , G11B7/09 , G11B7/125 , G11B7/127 , G11B7/135 , G11B7/1362 , G11B7/1395 , H01S5/22
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup device capable of being miniaturized and adaptable to two wavelengths without using combined prisms. SOLUTION: The optical pickup device 100 employs a semiconductor laser device 50 in which a first light emitting source 36 for emitting a first laser beam is integrated with a second light emitting source 40 for emitting a second laser beam with a wavelength different from that of the first. With a beam splitter 52 provided with a first and second half mirror functional faces 52b, 52c, the device is designed to make two optical paths coincide, consisting of one optical path in which the first laser beam, after passing through the first half mirror functional face 52b of the beam splitter 52, is reflected on the second half mirror functional face 52c, exiting again from the first half mirror functional face 52b, and going to bifocal lens 54, and the other optical path in which the second laser beam, reflected on the first half mirror functional face 52b, goes to the bifocal lens 54.

53. 发明专利

JP2001101701A COMPOSITE OPTICAL UNIT 失效
公开(公告)号：JP2001101701A
公开(公告)日：2001-04-13
申请号：JP28215399
申请日：1999-10-01
申请人： ALPS ELECTRIC CO LTD
发明人： YAMASHITA TATSUMARO , KYOTANI SHOICHI
IPC分类号： G11B7/00 , G11B7/12 , G11B7/125 , G11B7/1275 , G11B7/1353 , G11B7/1359 , G11B7/1362 , G11B7/1395 , G11B7/22 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a composite optical unit which may be reduced in cost, is dealable with an optical device using plural light sources of different wavelengths even with one composite optical device and is applicable to an optical pickup as well. SOLUTION: This composite optical unit has a housing 51 mounted at the optical pickup 100. A semiconductor laser 52, a photodetecting member 54 and a composite optical member 55 are integrally mounted and fixed to the housing 51. The semiconductor laser 52 has a laser diode 53 for emitting a laser beam 53' for DVDs. The composite optical member 55 is provided with an incident surface 55a on which the light emitted from the semiconductor laser 52 is made incident, an exit surface 55b from which the light is emitted, a diffraction grating 55f which is disposed on the exit surface 55b and diffracts the return light reflected by an optical disk D disposed on the exit surface 55b, a reflection surface 55d' which reflects the light diffracted by the diffraction grating 55f and an exit surface 55e' which emits the light reflected by the reflection surface 55d' to the photodetecting member 54.

54. 发明专利

JP3062099B2 失效
公开(公告)号：JP3062099B2
公开(公告)日：2000-07-10
申请号：JP25008196
申请日：1996-09-20
IPC分类号： G11B7/00 , G11B7/12 , G11B7/123 , G11B7/125 , G11B7/1275 , G11B7/13 , G11B7/131 , G11B7/135 , G11B7/1353 , G11B7/1356 , G11B7/1367 , G11B7/1381 , G11B7/139 , G11B7/1395

55. 发明专利

JP3048912B2 失效
公开(公告)号：JP3048912B2
公开(公告)日：2000-06-05
申请号：JP1974396
申请日：1996-02-06
IPC分类号： G11B7/09 , G11B7/00 , G11B7/125 , G11B7/135 , G11B7/1356 , G11B7/1367 , G11B7/1372 , G11B7/1395

56. 发明专利

JPH10199019A DUAL-FOCUS OPTICAL PICKUP DEVICE 失效
公开(公告)号：JPH10199019A
公开(公告)日：1998-07-31
申请号：JP35067897
申请日：1997-12-19
申请人： DAEWOO ELECTRON CO LTD
发明人： LEE KEUN JONG
IPC分类号： G11B7/08 , G11B7/00 , G11B7/12 , G11B7/123 , G11B7/125 , G11B7/127 , G11B7/13 , G11B7/135 , G11B7/1356 , G11B7/1395 , G11B19/12
摘要： PROBLEM TO BE SOLVED: To provide a dual-focus optical pickup device capable of selectively reproducing information recorded on digital video and digital audio disks by utilizing a laser beam emitted from a dual-wavelength laser diode. SOLUTION: The laser beams are selectively emitted to change a phase difference from a hologram element 210, in which a dual-wavelength laser diode 212 for selectively emitting laser wavelengths for a CD and a DVD and a photodetector 218 on the same line and disposing a hologram grating 216 and a diffraction plate 214 at a prescribed interval, are composited formed, and their phase difference changed. Abnormal light S and normal light P are emitted in a cubic polarizing prism via their optical paths differing from each other with a different time-lag, and are given linearity by a collimator lens 230. The abnormal light S and the normal light P form foci of 1.6μm and 0.8μm in diameter, and are reflected with optical information by feeding the digital video or digital audio disk, and are then diffracted by the hologram grating 216 of the hologram element 210 so as to be converged on the photodetector 218 respectively.

57. 发明专利

JP2725632B2 失效
公开(公告)号：JP2725632B2
公开(公告)日：1998-03-11
申请号：JP12545595
申请日：1995-05-24
申请人： NIPPON DENKI KK
发明人： TAKAHASHI JUNICHI
IPC分类号： G11B7/00 , G11B7/09 , G11B7/125 , G11B7/135 , G11B7/1353 , G11B7/1381 , G11B7/139 , G11B7/1395

58. 实用新型

JPH0514334Y2 失效
公开(公告)号：JPH0514334Y2
公开(公告)日：1993-04-16
申请号：JP15173686
申请日：1986-10-01
IPC分类号： G11B7/09 , G02B7/28 , G02B27/00 , G11B7/135 , G11B7/1359 , G11B7/1362 , G11B7/1381 , G11B7/1392 , G11B7/1395 , G02B7/11

59. 发明专利

JPH01303629A FIXING STRUCTURE FOR BEAM SPLITTER IN OPTICAL PICKUP 失效
公开(公告)号：JPH01303629A
公开(公告)日：1989-12-07
申请号：JP13507588
申请日：1988-05-31
申请人： ALPS ELECTRIC CO LTD
发明人： KYOTANI SHOICHI
IPC分类号： G02B7/00 , G11B7/08 , G11B7/135 , G11B7/1395
摘要： PURPOSE:To correct the dislocation of a converging point and to attain the correct detection by cantilever-supporting a beam splitter with a light emitting element side as a supporting point. CONSTITUTION:A beam splitter 3 is fixed by cantilever-supporting with the edge part of at a light emitting element side as a supporting point. Consequently, the inclination further occurs from an inherent angle to a light dividing surface 3a by the deformation, etc., due to the heat of the beam splitter 3, the reflecting light and the transmitting light due to the light dividing surface 3a have the inclination more than the inherent ones, and even then, the crossing position of the light dividing surface 3a of the beam splitter 3 to generate the inclination and the optical axis of the laser beam is dislocated in the direction to cancel the inclination of the reflecting light or the transmitting light. For this reason, even when the inclination occurs at the light dividing surface 3a of the beam splitter, the inclination is not reflected as the dislocation of the converging point as it is. Thus, while the dislocation is corrected, the converging point is stretched by a concave lens 7 and enters a pin photodiode.

60. 发明专利

JPS61278823A DEVICE FOR SYNTHESIZING OPTICAL BEAM 失效
公开(公告)号：JPS61278823A
公开(公告)日：1986-12-09
申请号：JP12049885
申请日：1985-06-05
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHINADA SATOSHI , INOUE MASAYUKI
IPC分类号： G11B7/135 , G02B6/34 , G02B27/28 , G11B7/1356 , G11B7/1395 , G11B7/1398 , G11B7/14
摘要： PURPOSE:To attain the shaping and synthesizing of two optical beams having different wavelengths respectively and the separation of the synthesized optical beam into emitted light and reflected light only by one optical element by unitedly forming two incident surfaces having a beam shaping function, a reflecting surface having wavelength selectivity and a polarizing surface. CONSTITUTION:An optical beam 1e with wavelength lambda2 outputted from the 2nd light source is parallel with an optical beams 1a, is made obliquely incident upon the 2nd incident surface 2f as P-polarized light similarly to the optical beam 1a and refracted as an optical beam 1f shaped at its vertical to horizontal ratio and the optical beam 1f is made incident upon an inner reflecting surface 2b. When the incident angle of the optical beam 1f upon the reflecting surface 2b coincides with that of the optical beam 1b, the optical axis of an optical beam 1g is made to coincide with that of the optical beam 1b and the optical beam 1g is projected from the 1st emitting surface 2e as an optical beam 1d2 similarly to the 1st light source. Consequently, the shaping and synthesis of two optical beams can be attained and the two optical beams can be made parallel with each other and intersected with the emitted light at right angles.

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