公开(公告)号：US4486791A

公开(公告)日：1984-12-04

申请号：US374781

申请日：1982-05-04

申请人： Yoshiyo Wada ,  Hisao Kinjo ,  Ichiro Ueno ,  Yoshihiko Honjo ,  Kazuo Tatsuguchi ,  Juichi Shikunami

发明人： Yoshiyo Wada ,  Hisao Kinjo ,  Ichiro Ueno ,  Yoshihiko Honjo ,  Kazuo Tatsuguchi ,  Juichi Shikunami

IPC分类号： H04N5/85 ,  G11B7/09 ,  G11B7/12 ,  H04N5/76 ,  G11B7/00

CPC分类号： H04N5/7605 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/12

摘要： An optical apparatus reproduces an information signal recorded as pits along track turns of a rotating recording medium. At least one kind of reference signal is recorded along and overlapping the lateral edges of the adjacent track turns of the information signal. A light source projects a first light beam onto the surface of the recording medium to simultaneously reproduce the information and reference signals. A detector responds to reflections of the projected light which includes and reproduces the information signal and the reference signal. The optical system is controlled so that the center of the light beam coincides with the centerline of the track. A circuit separates the reference signal from the total reproduced signal and produces a tracking control signal in response thereto.The optical system also projects a second light beam onto the recording medium and its reflected component is used for focus control. The depth of focus of the objective lens is substantially equal to or less than two times the pit depth, so that the focussing point of the reproduction light beam coincides with the upper surface of the rotating recording medium or the bottom surface of the pits. Thereby resulting in fine reproduction without introducing second-order harmonic distortion.

摘要翻译： 光学装置沿着旋转记录介质的轨道匝再现记录为凹坑的信息信号。 至少一种参考信号沿信息信号的相邻轨道匝的横向边缘记录并重叠。 光源将第一光束投射到记录介质的表面上，以同时再现信息和参考信号。 检测器对投影光的反射进行响应，该反射包括并再现信息信号和参考信号。 控制光学系统使得光束的中心与轨道的中心线重合。 电路将参考信号与总再现信号分离，并响应于此产生跟踪控制信号。

公开(公告)号：US4110607A

公开(公告)日：1978-08-29

申请号：US753005

申请日：1976-12-21

申请人： Yoshihiko Honjo ,  Junji Kuroda

发明人： Yoshihiko Honjo ,  Junji Kuroda

IPC分类号： G01B11/02 ,  G01B11/30 ,  G11B7/09 ,  G01J1/20

CPC分类号： G01B11/303 ,  G01B11/026 ,  G11B7/0908 ,  G11B7/0917 ,  G11B2007/0924

摘要： The invention relates to a system for detecting the height fluctuations of a surface on a recording medium in an optical recording or reproducing apparatus. A light source emits a main light beam for recording or reproducing. An optical system, including an objective lens, focuses the main light beam into a spot on the surface. A first reflecting mirror introduces a sublight beam into the peripheral part of the main light beam. The sub-light beam advances in a forward path through the objective lens to be projected onto the recording surface and reflected thereby. The sub-beam returns again through the objective lens along the peripheral part of the main light beam, but on the opposite side from said forward path. A second reflecting mirror extracts the sub-light beam in the return path out of the light to operate a detector which detects fluctuations in the distance between the objective lens and the recording surface and to produce control signals maintaining a constant distance between the objective lens and recording surface.

摘要翻译： 本发明涉及一种用于检测光学记录或再现装置中的记录介质上的表面的高度波动的系统。 光源发射用于记录或再现的主光束。 包括物镜的光学系统将主光束聚焦在表面上的光斑中。 第一反射镜将亚光束引入主光束的周边部分。 副光束通过物镜前进，被投射到记录表面上并被反射。 子光束沿着主光束的周边部分再次通过物镜返回，但是在与所述前向路径相反的一侧。 第二反射镜从光返回路径中提取子光束，以操作检测器，其检测物镜与记录表面之间的距离的波动，并产生保持物镜和物镜之间恒定距离的控制信号 记录表面。

公开(公告)号：US4611248A

公开(公告)日：1986-09-09

申请号：US758564

申请日：1985-07-24

申请人： Yoshihiko Honjo ,  Hisayoshi Yamada ,  Kazuhiro Hosono ,  Masaki Sakurai ,  Ryozo Abe ,  Kenji Yoshihara

发明人： Yoshihiko Honjo ,  Hisayoshi Yamada ,  Kazuhiro Hosono ,  Masaki Sakurai ,  Ryozo Abe ,  Kenji Yoshihara

IPC分类号： G11B21/08 ,  G11B27/00 ,  G11B27/30 ,  H04N5/91

CPC分类号： H04N5/91 ,  G11B21/083 ,  G11B27/007 ,  G11B27/3054 ,  G11B2220/20

摘要： A rotary recording medium recorded with an information signal including a video signal along a spiral track thereon, and from which the recorded information signal is reproduced by a reproducing apparatus in which a reproducing element scans over the spiral track, is further recorded with a stop signal on a track turn recorded with an information signal which is to be reproduced repeatedly for a predetermined time period so that the reproducing element repetitively reproduces the track turn for the predetermined time period. The reproducing apparatus comprises a stop signal detection circuit for detecting the stop signal from a signal reproduced by the reproducing element, and a circuit responsive to the stop signal detected by the stop signal detection circuit, for causing repetitive reproduction of a predetermined track turn recorded with the stop signal. The still picture reproduction is performed by repetitively reproducing the information signal recorded on a track turn recorded with the stop signal.

摘要翻译： 记录有包括沿其上的螺旋形轨道的视频信号的信息信号的旋转记录介质，并且再现元件在螺旋形轨迹上扫描的再现装置再现所记录的信息信号，并具有停止信号 在以预定时间段重复重放的信息信号的轨道转弯处，使得再现元件在预定时间段内重复地再现轨道转弯。 再现装置包括一个停止信号检测电路，用于从由再现元件再现的信号中检测停止信号，以及响应于由停止信号检测电路检测到的停止信号的电路，用于重复再现以 停止信号。 通过重复地再现记录在用停止信号记录的轨道转弯上的信息信号来执行静止图像再现。

公开(公告)号：US4123780A

公开(公告)日：1978-10-31

申请号：US753003

申请日：1976-12-21

申请人： Yoshihiko Honjo

发明人： Yoshihiko Honjo

IPC分类号： G11B7/0045 ,  G11B7/125 ,  H04N5/76 ,  G11B7/12

CPC分类号： G11B7/128 ,  G11B7/0045

摘要： The invention provides a system for optically recording information on a recording medium. A light source emits a laser light beam and an optical system, including a lens, focuses the laser beam spot on the recording medium. The light intensity of the laser beam is modulated responsive to an information signal. The light modulator is in a path between the light source and the optical system. A noise component is detected in the laser light beam passing through the light path and removed therefrom. The optical system records the information on the recording medium by the laser light beam, in which the noise component has been removed, and on which the information has been applied by the light modulator.

摘要翻译： 本发明提供一种用于在记录介质上光学记录信息的系统。 光源发射激光束，并且包括透镜的光学系统将激光束斑点聚焦在记录介质上。 响应于信息信号调制激光束的光强度。 光调制器位于光源和光学系统之间的路径中。 在穿过光路的激光束中检测到噪声分量并从中去除。 光学系统通过已经去除噪声分量的激光束将信息记录在记录介质上，并且光调制器已经在其上施加了信息。

公开(公告)号：US3959817A

公开(公告)日：1976-05-25

申请号：US518769

申请日：1974-10-29

申请人： Yoshihiko Honjo ,  Seisuke Hiraguri

发明人： Yoshihiko Honjo ,  Seisuke Hiraguri

IPC分类号： G11B15/12 ,  H03F3/72

CPC分类号： G11B15/12 ,  H03F3/72

摘要： A switching circuit connects a magnetic head in a magnetic recording and reproducing apparatus. The magnetic head is used for recording and reproducing signals onto and from a magnetic recording medium. The switching circuit comprises a first electronic switch connected between ground, the output side of a recording amplifier, and one terminal of the magnetic head. The switch becomes nonconductive during the recording mode and becomes conductive during the reproducing mode. A second electronic switch circuit is connected substantially between ground, the other terminal of the magnetic head, and the input side of a reproducing amplifier. The second switch becomes conductive during recording and nonconductive during the reproducing mode.