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    • 10. 发明授权
    • Optical playback system having increased depth-of-field
    • 光学播放系统具有增加的景深
    • US4179708A
    • 1979-12-18
    • US881366
    • 1978-02-27
    • Ping ShengArthur H. Firester
    • Ping ShengArthur H. Firester
    • G11B7/12G11B7/00
    • G11B7/12
    • Recovery from a record of information recorded in an elongated information track comprising depressed areas alternating along the length of the track with relatively non-depressed areas, is effected by an optical playback system. The playback system employs means for illuminating a focusing lens with a light beam having a cross-section forming a closed band of light, such as an annulus, to thereby increase the depth-of-field of the resulting focused spot formed on the information track. Light detection means, responsive to light diffracted by the track provides an output signal representative of the recorded data.
    • 通过光学回放系统实现从记录在细长信息轨道中的信息的恢复,该信息轨道包括沿着具有相对非凹陷区域的轨道的长度交替的凹陷区域。 回放系统采用用具有横截面的光束照射聚焦透镜的装置,该横截面形成诸如环带的闭合带隙,从而增加形成在信息轨道上的所得聚焦点的景深 。 光检测装置响应于由轨道衍射的光提供表示记录数据的输出信号。