专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2001184695A OPTICAL HEAD DEVICE 失效
公开(公告)号：JP2001184695A
公开(公告)日：2001-07-06
申请号：JP37156499
申请日：1999-12-27
申请人： TOSHIBA CORP , SANKYO SEIKI SEISAKUSHO KK
发明人： KINOSHITA AKIRA , KASUGA IKUO , OKINA TOSHIHIKO , YANAGISAWA KATSUSHIGE , HOTTA TORU
IPC分类号： G11B7/125 , G02B5/30 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To obtain the optimum circular polarization for a second light source and to reduce the effect of double refractivity of a recording medium in using light from a first light source, even in such an arrangement of optical elements that light beams from the first and second light sources form a common optical path. SOLUTION: The device is provided with the first and second light sources 11, 21 for reproducing a storage medium of low and high density respectively, with the first lens means 12, 13, 14 that guide the light beams emitted from these two light sources to the common optical path, and with the lens means 8, 9 that converge the light beams of the common optical path to emit to the data recording face of the storage medium. In addition, as a phase delay element 40, one with a phase delay of roughly 90+180 n degrees (n is an integer) is provided for the light beam of the second wavelength and one with roughly 180 n degrees for the first wavelength.

2. 发明专利

JP2001160230A OPTICAL HEAD DEVICE 失效
公开(公告)号：JP2001160230A
公开(公告)日：2001-06-12
申请号：JP34274799
申请日：1999-12-02
申请人： SANKYO SEIKI SEISAKUSHO KK , TOSHIBA CORP
发明人： YANAGISAWA KATSUSHIGE , HOTTA TORU , KASUGA IKUO , OKINA TOSHIHIKO , KINOSHITA AKIRA , KUROSAWA HIDEO , SAI HIDENORI , SHINODA MASAYUKI
IPC分类号： G11B7/09 , G11B7/12
摘要： PROBLEM TO BE SOLVED: To provide an optical head device having a use lens detecting mechanism capable of always well maintaining use lens detecting sensitivity without being affected by a mounting posture. SOLUTION: The optical head device 1 has the use lens detecting mechanism 20 for detecting which of objective lenses 101 and 103 exists in an operating position. The use lens detecting mechanism 20 has a light reflection surface 21 formed at a lens holder 102 in order to reflect part of a laser beam while the objective lens 103 is used and a photodetector 22 mounted at a holder supporting unit 105 in order to receive the reflected light reflected by the light reflection surface 21. The major axis direction MJ of an FFP of the laser beam L aligns to a direction where the light reflection surface 21 is installed. Then, even if the light reflection surface 21 formed at the lens holder 10 is moved by the mounting posture, the photodetector 22 may be always irradiated with the reflected laser beam L21 of a sufficient light quantity and therefore the use lens detection is eventually executed with the always good detection sensitivity without being affected by the mounting posture.

3. 发明专利

JP2001076371A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001076371A
公开(公告)日：2001-03-23
申请号：JP24843899
申请日：1999-09-02
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： YANAGISAWA KATSUSHIGE
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a constitution capable of focusing both of two kinds of light onto the same photodetector when a spherical aberration occurring in the substrate thickness of an optical recording medium is absorbed by a spherical aberrations generated in two kinds of the light. SOLUTION: In this device 10, a first light of wavelength 640 nm and second light of wavelength 725 nm emitted from first and second light sources 11 and 12 are introduced by a light transmission system 25 to a common optical path 27. The return light 101 of the first light reflected by a digital video disk 17 and the return light 102 of the second light reflected by a compact disk 18 are introduced to the common photodetector 22. Since the first and second light sources 11 and 12 vary in the lengths of the optical paths up to a condensing system 25, the first and second return light 101 and 102 are made incident on a hologram element 20, thereby, the zero order light 101a of the return light 101 of the first light and the +1st order light 102b of the return light 102 of the second light are focused onto the photodetector 22.

4. 发明专利

JP2001076351A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001076351A
公开(公告)日：2001-03-23
申请号：JP25257999
申请日：1999-09-07
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： YANAGISAWA KATSUSHIGE
IPC分类号： G11B7/08 , G11B7/125 , G11B7/127 , G11B7/22
摘要： PROBLEM TO BE SOLVED: To make it possible to align the center of the light quantity distribution of a laser beam source to the optical axis of a system with a simple mechanism. SOLUTION: A mounting part 21 for a laser diode 1 is formed at the device frame of this device. The mounting part 21 has a pair of inner peripheral surfaces 233 and 234 for press fitting which allow the press fitting of a circular outer peripheral surface 103 of a stem 101 of the laser diode 1 and a pair of projecting surfaces 241 and 242 which support an annular end face 104 of the stem of the laser diode 1 oscillatably around an oscillation central line L1. The laser diode 1 is oscillated around the oscillation central line L1 after the press fitting of the laser diode 1, thereby, the center of the light quantity distribution of the laser beam emitted therefrom can be aligned to the optical axis of the system.

5. 发明专利

JPH1153757A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JPH1153757A
公开(公告)日：1999-02-26
申请号：JP20744797
申请日：1997-08-01
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： YANAGISAWA KATSUSHIGE , ISOBE HISAO
IPC分类号： G11B7/135 , G11B7/20
摘要： PROBLEM TO BE SOLVED: To prevent a returning light from an optical recording medium from being shielded by an aperture switching element in an optical pickup device performing recording/reproducing in optical recording media having different recording modes by using the aperture switching element. SOLUTION: In an optical pickup device 10, when DVD reproducing is switched to CD reproducing, an aperture switching element 1 for switching the numerical aperture of an objective lens 6 is inserted between a light guiding system 31 and the objective lens 6. The aperture switching element 1 includes a transmission part 101 for transmitting the light components of a specified range including the center optical axis of a laser light and a shielding part 102 for shielding remaining light components, and the transmission part 101 is formed in a slit shape extended in a direction A equivalent to a track shifting direction. Thus, even when the objective lens 6 is track-shifted, all the returning lights from an optical recording medium 7 are guided to a photodetector 9 without being shielded by the aperture switching element 1.

6. 发明专利

JPH10302295A OPTICAL PICKUP 失效
公开(公告)号：JPH10302295A
公开(公告)日：1998-11-13
申请号：JP10564097
申请日：1997-04-23
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： YANAGISAWA KATSUSHIGE , SHIRATORI TOSHIO , KASUGA IKUO
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To obtain an optical pickup comprising two types of dedicated light source for recording/reproducing different kinds of optical recording media in which the optical system is constituted compactly and inexpensively. SOLUTION: First and second laser lights L1, L2 from laser diodes 4, 5 for DVD and CD are introduced to a common optical path 6 and the returning light from an optical recording medium is introduced to a common photodetector 11 by an optical waveguide system 20. The optical waveguide system 20 comprises a half mirror 21 having a first partial reflecting face 21a for partially reflecting the laser light L1 and transmitting the laser light L2, and a prism 22 having a second partial reflecting face 22a for partially reflecting the laser liqht L2 and transmitting the laser light L1. The laser diodes 4, 5 are arranged at positions conjugate to a photodetector 10. Consequently, the majority of the optical system from the laser diodes 4, 5 to the optical recording medium and the optical system for introducing the returning light from the optical recording medium to a photodetector 11 can be shared resulting in an inexpensive compact optical pickup.

7. 发明专利

JPH10177737A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JPH10177737A
公开(公告)日：1998-06-30
申请号：JP33661796
申请日：1996-12-17
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： KASUGA IKUO , YANAGISAWA KATSUSHIGE
IPC分类号： G02B27/28 , G02B5/30 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To constitute an optical system of an optical pickup device provided with a polarization separating optical element and a 1/4 wavelength plate and constituted so as to separate reflection light from an optical recording medium from emitted light from a light source to detect it to a small size and compact. SOLUTION: In the optical system of the optical pickup device 10, a polarizing beam splitter 3 being the polarization separating optical element and the 1/4 wavelength plate 4 are arranged on an optical path of divergent light L1 outgoing from a laser diode 1 in this order. Since these optical elements 3, 4 are arranged using the optical path of the divergent light difficult to shorten by an optical limit, the optical system is miniaturized and made compact. As the l/4 wavelength plate 4, one of a two sheets stuck structure with low incident angle dependency is suitable. Instead of this, the 1/4 wavelength plate of a more inexpensive single plate structure may be adopted also by suppressing the divergent angle of the divergent light to nearly 4 degree or below.

8. 发明专利

JP2002230818A OPTICAL HEAD DEVICE 失效
公开(公告)号：JP2002230818A
公开(公告)日：2002-08-16
申请号：JP2001026339
申请日：2001-02-02
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： YANAGISAWA KATSUSHIGE
IPC分类号： G11B7/00 , G11B7/125 , G11B7/1263 , G11B7/1275 , G11B7/135 , G11B7/1353 , G11B7/1381
摘要： PROBLEM TO BE SOLVED: To provide an optical head device which has an excellent reproducing characteristic hardly being influenced by a double refractivity even when an optical recording medium has the double refractivity. SOLUTION: In the optical head device 1, laser beams L1 and L2 which are reflected on the optical recording medium D return through an objective 13, a collimating lens 12, and a rising mirror 11, reaches a light-receiving element 9 via a half mirror 7 after returning again to a prism 6. In this case, the total transmission efficiency of each of the partial reflective faces 60 and 70 of the prism 6 and the half mirror 7 is nearly equal with respect to a P- polarized light and a S-polarized light. Thus, a stable reproducing characteristic is available even when the optical recording medium D has the double refractivity.

9. 发明专利

JP2001023179A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001023179A
公开(公告)日：2001-01-26
申请号：JP19254099
申请日：1999-07-07
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： HOTTA TORU , KASUGA IKUO , YANAGISAWA KATSUSHIGE
IPC分类号： G11B7/08 , G02B7/10 , G11B7/085 , G11B7/22
摘要： PROBLEM TO BE SOLVED: To obtain an optical pickup device with an inclination angle-adjusting mecha nism for adjusting the inclination angle of an objective lens around the axial line in the tangential direction of an optical disk and around the axial line in the radius direction of the optical disk by turning an inclination angle-adjusting screw. SOLUTION: The optical pickup device 1 is provided with a first inclination angle- adjusting mechanism for inclining an objective lens 2 with a first axial line L1 that is extended in the tangential direction of an optical disk and at the same time passes through the center of a sub axis guide groove 501 as the center, and a second inclination angle-adjusting mechanism for inclining the objective lens 2 with a second axial line L2 that agrees with the center of a spindle being extended in the radius direction of the optical disk as a center. Then, each inclination angle-adjusting mechanism adjusts the inclination angle of the objective lens by adjusting the inclination of a spindle guide frame 4 and a sub-axis guide frame 5 being mounted by turning respective inclination angle-adjusting screws so that it can be inclined with the first and third axial lines L1 and L3 as a center for a main frame 3. Both the inclination angle- adjusting mechanisms are in the same structure and adjust inclination angle around both the axes by turning an inclination angle-adjusting screw.

10. 发明专利

JPH08321062A OBJECTIVE LENS DRIVING DEVICE 失效
公开(公告)号：JPH08321062A
公开(公告)日：1996-12-03
申请号：JP15087195
申请日：1995-05-25
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： YANAGISAWA KATSUSHIGE , SHIBA KAZUO
IPC分类号： G11B7/09 , G11B7/135
摘要： PURPOSE: To obtain the objective lens driving device having good dynamic characteristics and static characteristics by making an inertial axis of a movable holder equipped with plural objective lenses, a coil fitting part and a yoke inserting hole align a spindle. CONSTITUTION: The movable holder 12 having lens holding parts 12c for mounting one pair of objective lenses 13 and 14 on the upper surface is fitted to the spindle 11 turnably and slidably by a main axis inserting hole 12b. The movable holder 12 is provided with the lens holding parts 12c on the upper surface, a tracking drive coil 15 and a focusing drive coil 16 on the circumferential wall surface and moreover, the yoke inserting hole 12a at a position symmetrical to the spindle inserting hole 12b in its inside. The objective lenses 13 and 14 are made of the same material, in the same shape and mass, and hence the movable holder 12 assembled with these parts is finally balanced. By this structure, the inertial axis of the movable holder 12 is aligned with spindle, thus obtaining good dynamic characteristics and static characteristics.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式