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1. 发明专利

JPS59185043A Optical disc device 失效
标题翻译：光盘设备
公开(公告)号：JPS59185043A
公开(公告)日：1984-10-20
申请号：JP5512583
申请日：1983-04-01
申请人： Hitachi Electronics Eng Co Ltd , Hitachi Ltd
发明人： KANEDA NORIYA , NAKAMURA SHIGERU , TOKUTOMI TERUAKI , TAKAHASHI SADAO
IPC分类号： G02B27/09 , G11B7/09 , G11B7/135
CPC分类号： G11B7/135 , G11B7/09
摘要： PURPOSE:To decrease the effect of variance in the distribution of a radiated light on a tracking characteristic by combining a triangular prism correcting the intensity distribution of light and the optical system at the post-stage in a specific direction. CONSTITUTION:The laser light outputted from a collimator lens 12 having the elliptic distribution taking the x axis as the minor axis and the y axis as the major axis is corrected with magnification in the x axis direction by the triangular prism 13 and after the light of nearly circular distribution goes straight in the z axis direction, the light is reflected in the y axis direction and irradiated onto a track T running in the x axis direction. Thus, the direction of intensity correction of a light spot S is made coincident with the direction of a pit of the track T to an information recording face of an optical disc, and even if a variation is produced in the intensity distribution of the spot S because of the variation in the correcting amount of the like of the triangular prism 13 or the intensity distribution of the output light of a semiconductor element 11, this variation appears in the lengthwise direction of the track and a nearly constant intensity distribution is obtained in the track width direction affected on the tracking characteristic, allowing nearly to uniform the tracking performance.
摘要翻译：目的：通过组合三角棱镜来校正光的强度分布和光学系统在特定方向的后期阶段，减少辐射光分布的变化对跟踪特性的影响。构成：从具有作为短轴的x轴和作为长轴的y轴的椭圆形分布的准直透镜12输出的激光通过三角棱镜13在x轴方向上被放大倍数校正，并且在近似圆形的分布在z轴方向上呈直线状，光沿y轴方向反射并照射到在x轴方向上行进的轨迹T. 因此，使光点S的强度校正方向与轨道T的凹坑的方向一致，到光盘的信息记录面，并且即使在斑点S的强度分布中产生变化由于三角棱镜13的校正量的变化或半导体元件11的输出光的强度分布的变化，这种变化出现在轨道的长度方向上，并且在轨道宽度方向受到跟踪特性的影响，允许跟踪性能几乎一致。

2. 发明专利

JPS62248142A LASER BEAM SOURCE DEVICE 失效
公开(公告)号：JPS62248142A
公开(公告)日：1987-10-29
申请号：JP8690187
申请日：1987-04-10
申请人： HITACHI LTD , HITACHI ELECTR ENG
发明人： KITANI HIROSHI , TOKUTOMI TERUAKI , KANEDA NORIYA , TAKAHASHI SADAO
IPC分类号： G11B7/125 , G11B7/135 , H01S5/00
摘要： PURPOSE:To remarkably facilitate the assembling and adjustment and to stably irradiate the light having circular cross section by using a semiconductor laser beam source, a coupling lens and a triangle prism as one light source assembly. CONSTITUTION:The light from a semiconductor laser beam source 1 is collimated by a coupling lens 2 and the elliptic light is collimated into a parallel light having nearly circular cross section by a triangle prism 7. The three optical components are arranged into one light source assembly by coupling members 3, 4, 5. Thus, the relation between the optical axis of the lens 2 and the incident angle of the prism 7 depends on the shape of the coupling member 5 and the deviation of the fitting angle is not almost caused. Further, the relation between the light source 1 and the lens 2 is positioned optionally by adjusting the coupling members 3, 4 in x, y directions. Thus, the assembling/adjustment is much facilitated and the light having circular cross section is stably irradiated.

3. 发明专利

JPS5990241A LIGHT SOURCE DEVICE 失效
公开(公告)号：JPS5990241A
公开(公告)日：1984-05-24
申请号：JP19760582
申请日：1982-11-12
申请人： HITACHI LTD , HITACHI ELECTR ENG
发明人： KANEDA NORIYA , TOKUTOMI TERUAKI , YABUUCHI KOUICHI , TAKAHASHI SADAO , NAKAMURA SHIGERU
IPC分类号： G06K7/10 , G02B6/42 , G11B7/12 , G11B7/123 , G11B7/125
摘要： PURPOSE:To obtain a small-sized light source device which is positioned easily and superior in mechanical strength by uniting a semiconductor laser element holder and a lens holder together through a coupling ring. CONSTITUTION:A semiconductor laser 11 is inserted from the rear of the element holder 20 and united with an adhesive during assembly. A lens barrel 12, on the other hand, is inserted into the rear part of an auxiliary cylinder 32 and united with an adhesive, then the auxiliary cylinder 32 is inserted into the lens holder 31 and fixed temporarily with a screw 42. Then, while the holder 20 and coupling ring 30 are fixed lightly with a screw 40 in an abutting state, the optical axis direction of the laser 11 is made coincident with the center axis of the coupling ring 30. Laser light 50 is emitted from the center hole 50' of an observation plate 51 to the center of a lens 12 and the position of a lens block is fixed so that 0-order interference light coincides with the center hole 50' and adjusted and fixed with the screws 41 and 42 so that the light spot of the laser 11 coincides with the center hole 50'. Thus, the small-sized light source which is positioned easily and superior in mechanical strength is obtained.

4. 发明专利

JPS58170354A LINEAR ACTUATOR 失效
公开(公告)号：JPS58170354A
公开(公告)日：1983-10-06
申请号：JP5167082
申请日：1982-03-30
申请人： HITACHI LTD , HITACHI ELECTR ENG
发明人： UNO MOTOO , KANEDA NORIYA , TOKUTOMI TERUAKI , MURAOKA KOUJI
IPC分类号： H02K33/18 , G11B21/02 , H02K41/035
摘要： PURPOSE:To reduce rigidity of a movable part and induction of elastic vibration mode, and to enhance positional precision of a recording and reproducing head by a method wherein a twin body type driving coil is used both as magnetic members and guide faces. CONSTITUTION:The cylindrical coils 1a, 1b to generate thrust are arranged in parallel mutually, and the magnetic members 2a, 2b are arranged in parallel penetrating respectively into the coils 1a, 1b thereof. The magnetic members 2a, 2b are constructed as to make magnets 21a, 21b and yokes 23a, 23b, 24a, 24b to face mutually interposing gaps 22a, 22b between them. The guide faces 25a, 25b, 26a, 26b have the inclination of nearly 45 deg. respectively in relation to the horizontal plane on the yokes 23a, 23b on one side. The coils 1a, 1b are connected by a plate 3, and moreover a frame 4 is connected to the plate 3. Rims 8a, 8b connect the sides of the coils 1a, 1b and the frame 4. The recording and reproducing head 41 is fixed on the frame 4.

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