公开(公告)号：US3870835A

公开(公告)日：1975-03-11

申请号：US35160073

申请日：1973-04-16

Applicant: RCA CORP

Inventor： STAVE FREDRICK ROLAND

IPC: G11B3/02 ,  G11B3/06 ,  G11B3/085 ,  G11B3/095 ,  G11B3/36 ,  G11B3/46 ,  G11B9/00 ,  G11B33/10 ,  G11B17/06 ,  G11B3/00

CPC classification number: G11B33/10 ,  G11B3/06 ,  G11B3/0952 ,  G11B3/36 ,  G11B3/46 ,  G11B9/00

Abstract: A playback system has a rotatably driven turntable for controlling the operation of a playback stylus device with a video disc record disposed on the turntable. The video information, which is recorded in the form of geometric variations in a spiral groove of the record, is recovered by sensing the capacitance between the stylus playback device and the record surface. The stylus is supported in a housing which is movable in a manner to provide travel of the stylus radially over the record. A stylus control device provides movement of the stylus relative to the housing into and out of engagement with the record surface. Two drive arrangements are provided to be operable in alternative manner to drive the stylus housing over the record. A movable pointer is provided to indicate the position of the stylus along the record. Each of first and second drive means have motion coupling devices, which are controllably engageable in alternative manner to a driving shaft of the turntable. A movable drive change assembly is intercoupled with the respective drive arrangements and the stylus control apparatus, to selectively energize the drive and stylus control apparatuses. The system includes a manual selector arm for positioning a portion of control mechanism, which is instrumental in establishing drive control of the stylus housing and positioning of the stylus. The selector positions one of a pair of electrical contacts in a given initial spaced relation. The second electrical contact is positioned by a portion of the drive means to cause the contacts to engage at a desired position of the stylus over the record. An electrical circuit completed thereby is operative through electro-mechanical means to control the drive and positioning of the stylus with respect to the record. A manually actuatable lever arrangement is coupled to the drive and stylus control mechanism. This mechanism when actuated is operative to disengage drive of the stylus housing over the record and remove the stylus from the record, while maintaining the position of the stylus with respect to the center of the record.

Abstract translation: 回放系统具有旋转驱动的转盘，用于控制具有设置在转盘上的视盘记录的重放触针装置的操作。 通过感测触控笔播放装置和记录表面之间的电容来恢复记录在记录的螺旋槽中的几何变化形式的视频信息。 触针支撑在壳体中，壳体可以以提供触针的径向在记录上的行进的方式移动。 触针控制装置提供触针相对于外壳的移动，进入和离开与记录表面的接合。 提供两个驱动装置以可替代的方式操作以在记录上驱动触针外壳。 提供可移动指针以指示触笔沿记录的位置。 第一驱动装置和第二驱动装置中的每一个具有运动联接装置，其以与转盘的驱动轴可替代的方式可控制地接合。 可移动的驱动器更换组件与相应的驱动装置和触针控制装置相互配合，以选择性地激励驱动器和触笔控制装置。