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    • 2. 发明授权
    • Magnetic record tape protective device for a tape cassette
    • 磁带记录磁带保护装置
    • US4372504A
    • 1983-02-08
    • US199223
    • 1980-10-21
    • Tsutomu ShibataKenji KimuraKen SatohSinichi SaitouToshikazu KatoSeizo WatanabeKen Ohshima
    • Tsutomu ShibataKenji KimuraKen SatohSinichi SaitouToshikazu KatoSeizo WatanabeKen Ohshima
    • G11B15/675G11B23/087G03B1/04G11B15/32
    • G11B23/087G11B15/67565
    • This invention is for a tape cassette having window for insertion of a magnetic head and a pinch roller formed extending from a peripheral wall of the housing of the tape cassette to one of the holding plates which holds a pair of reel hubs in place. The device according to this invention has a shutter member, and a resilient metal wire housed in the housing. The shutter member has projections which are to be engaged with an engaging member provided on a tape cassette holder member of the magnetic tape transport apparatus. The metal wire urges the shutter member to close a portion of the window formed in the holding plate. When the cassette is loaded into the loading member, the projections engage with the engaging member and the shutter member releases the closing state of the holding plate forming portion of the window against an urging force of the wire. When the cassette is removed from the loading member, the shutter member closes the holding plate forming portion to prevent the tape from being damaged by an external force.
    • 本发明是一种具有用于插入磁头的盒式磁带和从磁带盒的壳体的周壁延伸到其中一个保持板的夹送辊,该保持板将一对卷轴毂保持就位。 根据本发明的装置具有挡板部件和容纳在壳体中的弹性金属丝。 活门构件具有与设置在磁带传送装置的磁带盒保持构件上的接合构件接合的突起。 金属丝促使闸门构件封闭形成在保持板中的窗口的一部分。 当盒被装载到装载构件中时,突起与接合构件接合,并且挡板构件抵抗着线的推动力而释放窗户的保持板形成部分的关闭状态。 当盒从装载构件上移除时,挡板构件封闭保持板形成部分,以防止带被外力损坏。
    • 4. 发明授权
    • Servo apparatus for compensating for warp and deflection deviations on
optical discs
    • 用于补偿光盘上的翘曲和偏转偏差的伺服装置
    • US4710908A
    • 1987-12-01
    • US652451
    • 1984-09-19
    • Ken OhshimaTadashi Shimizu
    • Ken OhshimaTadashi Shimizu
    • G11B7/00G11B7/004G11B7/007G11B7/09G11B7/095G11B7/12G11B7/125G11B7/126G11B33/10
    • G11B33/10G11B7/126G11B7/0908G11B7/0945G11B7/0956
    • Apparatus for compensating for physical deviations due to warp and surface deflections in optical discs during optical recording and reproducing operations. Focus error signals are developed corresponding to the individual addresses of the physical deviations and the extent of deviation from the in-focus position of the focusing lens by moving a light pickup under control of a microcomputer radially of the disc so that N given radial pitch intervals are defined relative to the record surface of the optical discs and M circumferential address positions of each rotation of the disc. The detector detects the focus error signal values at M.sub.x N.sub.x address locations which are memorized in a memory storing M.times.N values and these are used for developing control signals for moving a focusing lens vertically with an actuator activated by the control signals so that the position of the focusing lens vertically is positioned relative to the record surface so that the focus distance to the record surface is compensated for the physical deviations and an in-focus condition obtained. An arithmetic unit develops light intensity correction values from the memorized data and from this power correction values signals are applied to the source of light beam so that the light beam is applied to the record surface as a spot of proper area dimensions and intensity compensated for the physical deviations.
    • 用于在光学记录和再现操作期间补偿由于光盘中的翘曲和表面偏转引起的物理偏差的装置。 通过在微型计算机在盘的径向控制下移动光拾取器,对应于物理偏差的个别地址以及与聚焦透镜的对焦位置偏离的程度而产生对焦误差信号,使得N个给定的径向间距间隔 相对于光盘的记录表面定义,并且每个盘的旋转的M个圆周地址位置。 检测器检测存储在存储MxN值的存储器中存储的MxNx个地址位置处的聚焦误差信号值,并且它们用于开发用于通过由控制信号激活的致动器垂直移动聚焦透镜的控制信号,使得聚焦位置 透镜垂直地相对于记录表面定位,使得到记录表面的聚焦距离被补偿了物理偏差和获得的对焦条件。 算术单元从存储的数据中产生光强度校正值,并且从该功率校正值将信号施加到光束源,使得光束被施加到记录表面,作为适当面积尺寸和强度补偿的点 身体偏差。
    • 6. 发明授权
    • Optical beam tracking system for use in optical information recording
and/or reproducing apparatus
    • 用于光信息记录和/或再现装置的光束跟踪系统
    • US4718051A
    • 1988-01-05
    • US686218
    • 1984-12-26
    • Ken OhshimaJun SakashitaHiroo Okada
    • Ken OhshimaJun SakashitaHiroo Okada
    • G11B21/10G11B7/085G11B7/09G11B7/095G11B7/00
    • G11B7/0953
    • A beam tracking system is used in an optical information recording and/or reproducing apparatus to optically track a record medium track. An objective lens irradiates an optical beam onto the record medium and is driven by a lens actuator to sweep the optical beam in a coarse mode relative to a predetermined track of the record medium. A carriage moves relative to the record medium for carrying the objective lens thereon and is driven by a carriage actuator to sweep the optical beam in a fine mode relative to the track. A detector detects the reflected optical beam during the sweep of the optical beam to produce a tracking signal representative of the deviation of the optical beam from the track. A pair of control circuits are connected to control the lens and carriage actuators respectively to effect the alignment of the optical beam with the track according to the tracking signal. A timing circuit is coneected to enable operation of the control circuit which controls the lens actuator and to inhibit operation of the other control circuit which controls the carriage actuator for a certain interval to effect alignment of the optical beam solely by means of the lens actuator, and thereafter to enable the other control circuit to maintain the optical beam alignment by means of the cooperative action of the lens and carriage actuators.
    • 在光学信息记录和/或再现装置中使用光束跟踪系统来光学地跟踪记录介质轨迹。 物镜将光束照射到记录介质上并由透镜致动器驱动,以相对于记录介质的预定轨迹以粗略模式扫描光束。 托架相对于记录介质移动以在其上携带物镜,并且由托架致动器驱动以相对于轨道以精细模式扫掠光束。 检测器在扫描光束期间检测反射的光束,以产生代表光束偏离轨道的偏差的跟踪信号。 连接一对控制电路以分别控制透镜和滑架致动器,以根据跟踪信号实现光束与轨迹的对准。 定时电路是圆锥形的,以使控制电路的操作能够控制透镜致动器并且禁止控制滑架致动器一定间隔的另一个控制电路的操作,以仅通过透镜致动器来实现光束对准, 之后使得另一个控制电路能够通过透镜和滑架致动器的协同作用来保持光束对准。
    • 7. 发明授权
    • System for focusing an optical head onto a flat surface
    • 用于将光学头聚焦到平坦表面上的系统
    • US4495407A
    • 1985-01-22
    • US362613
    • 1982-03-29
    • Hiroshi KodamaMasaharu SakamotoKen OhshimaShoji YoshikawaKunio YamamiyaKiichi Kato
    • Hiroshi KodamaMasaharu SakamotoKen OhshimaShoji YoshikawaKunio YamamiyaKiichi Kato
    • G02B7/00G02B7/32G11B7/085G11B7/09G01J1/20
    • G11B7/08511G02B7/32G11B7/0908
    • A system for focusing an optical head onto a flat surface has a mechanism for moving the optical head in the direction of the optical axis of the head and a mechanism for moving an objective lens in the optical head in the direction of the optical axis of the lens. A laser beam projected from the objective lens of the optical head is reflected on the flat surface, is reflected on the beam splitter, and is introduced into a detector unit. The detector unit thus generates a focusing signal having a level responsive to the distance between the objective lens and the surface. The optical head is lowered by the mechanism for moving the optical head in accordance with the focusing signal when it passes a predetermined point, and is operated to locate the focal point of the objective lens on the surface. Thereafter, the mechanism for moving the optical head becomes inoperative, and the mechanism for moving the objective lens is operated. This mechanism operates in accordance with the focusing signal and locates the focal point of the objective lens always on the surface.
    • 用于将光学头聚焦到平坦表面上的系统具有用于沿着光头的光轴方向移动光学头的机构,以及用于沿光学头的光轴方向移动光学头中的物镜的机构 镜片。 从光头的物镜投射的激光束在平坦表面上反射,在分束器上被反射,并被引入到检测器单元中。 因此,检测器单元产生具有响应物镜与表面之间距离的电平的聚焦信号。 通过用于在通过预定点时根据聚焦信号移动光学头的机构降低光学头,并且操作以将物镜的焦点定位在表面上。 此后,用于移动光学头的机构变得不起作用,并且用于移动物镜的机构被操作。 该机构根据聚焦信号进行操作,并将物镜的焦点始终位于表面上。
    • 10. 发明授权
    • Microprocessor controlled focussing servo acquisition
    • 微处理器控制聚焦伺服采集
    • US4683560A
    • 1987-07-28
    • US561631
    • 1983-12-15
    • Toyoaki TakeuchiKen OhshimaHideyuki KenjyoYoshiaki IkedaMasaharu Sakamoto
    • Toyoaki TakeuchiKen OhshimaHideyuki KenjyoYoshiaki IkedaMasaharu Sakamoto
    • G02B7/28G11B7/085G11B7/095
    • G11B7/085
    • In an auto-focussing system, an actuator which moves together with an objective lens is vertically movable against a rotating optical disc and radiates a light beam so as to form a light spot on an information plane of the disc. A focus servo unit moves the actuator so that an optical distance between the actuator and the disc is within a proper distance region and performs the focus control of the light spot on the disc. While the actuator is approaching the optical disc, an auto-focus/focus servo controller initially makes the servo unit nonoperative and, when the actuator reaches a too-far position in a suitable servo loop distance region specified by a servo loop of the focus servo unit, the controller temporarily stops the movement of the actuator and then moves the actuator again from the too-far position by only a predetermined distance, thereby causing the actuator to be located within the focus loop distance region.
    • 在自动聚焦系统中,与物镜一起移动的致动器可以相对于旋转的光盘上下移动并且辐射光束,以在光盘的信息平面上形成光点。 聚焦伺服单元使致动器移动,使得致动器和盘之间的光学距离在适当的距离区域内,并执行光盘上的光点的聚焦控制。 当致动器接近光盘时,自动对焦/聚焦伺服控制器最初使得伺服单元不起作用,并且当致动器在由聚焦伺服的伺服环路指定的合适的伺服环路距离区域中达到太远位置时 控制器暂时停止致动器的移动,然后使致动器再次从太远位置移动预定距离,从而使致动器位于聚焦环距离区域内。