公开(公告)号：US3783196A

公开(公告)日：1974-01-01

申请号：US3783196D

申请日：1971-03-22

Applicant: RCA CORP

Inventor： STANLEY T

IPC: G11B9/06 ,  G11B3/10 ,  G11B9/00 ,  G11B9/07 ,  H04N5/76 ,  H04N5/92 ,  G11B3/44

CPC classification number: H04N5/92 ,  G11B9/00 ,  H04N5/7605 ,  H04N5/903

Abstract: A high-density information record comprises a stamped thermoplastic (e.g., vinyl) disc having a constant-width spiral surface groove, the center-to-center spacing of successive closely spaced convolutions of the groove spiral being substantially constant and independent of the recorded information. The recorded information appears as an information track constituting variations in the geometry of the groove bottom along its length. Playback apparatus employs a stylus having a tip conformed to be received in the disc groove in engagement with smoothly curved side walls of groove. As a discsupporting turntable rotates, the stylus rides in the groove passing over successive dimension-varying information track elements in the groove bottom, which serve to vary the capacitance presented between a conductive electrode incorporated in the stylus tip and a reference conductor (e.g., a conductive surface of the disc-supporting turntable). The capacitance variations occurring during playback are translated into electrical signal variations by appropriate circuitry. Per illustrative embodiment, inexpensively replicated video disc of appreciable playing time is subject to playback by abovedescribed techniques.

Abstract translation: 高密度信息记录包括具有恒定宽度的螺旋表面凹槽的冲压热塑性塑料（例如乙烯基）盘，凹槽螺旋的连续紧密间隔的卷绕的中心间距基本上是恒定的并且独立于所记录的信息 。 记录的信息显示为信息轨迹，其构成沿其长度的槽底的几何形状的变化。 播放装置采用具有尖端的触针，该笔尖被容纳在盘槽中，与凹槽的平滑弯曲的侧壁接合。 当盘支承的转盘旋转时，触控笔越过凹槽底部的连续的尺寸变化的信息轨道元件的凹槽中，该凹槽用于改变插入触针尖端的导电电极与参考导体之间的电容（例如， ，盘支承转盘的导电表面）。 播放期间发生的电容变化由适当的电路转换为电信号变化。 根据说明性实施例，通过上述技术对可观的播放时间的廉价复制视频盘进行回放。