| 摘要 |
<p>The present invention relates to directing a reading light beam onto the surface of a video disc. Prior art attempts to make use of a reading light beam for contact with the surface of a video disc involved large apparatuses for housing the optical path of the beam primarily due to the length of the light source and the optical devices necessary to direct and control the beam, The present invention provides an improved apparatus and method wherein the light beam follows a folded path, In accordance with the invention, a source is provided for producing a reading beam of light radiation. The reading beam is directed from the light source along a folded, substantially U-shaped optical path and then onto the surface of the video disc. The reading light beam contacts the information track of the video disc whereupon the beam is modulated by the information track. A sensor receives the modulated beam of radiation from the information track, The folded optical path takes up less space in the player and therefore makes the player more suitable for home entertainment.</p> |
