Optical sensor for focusing control

Details Optical sensor for focusing control Optical sensor for focusing control

G - Physics

11

B

352/32.21

G11B 7/09 (2006.01) G11B 7/125 (2006.01)

Patent

CA 1195775

AN OPTICAL SENSOR FOR FOCUSING CONTROL Abstract of the Disclosure An optical sensor for delivering error signals in order to control focusing of a lens on a movable recording medium or optical memory and more particularly a videodisk comprises a laser for producing a beam which is focused at a point S1. The divergent beam which pro- ceeds from the point S1 is reflected from the face AB of a prism and is focused at a point S2. If the point S2 is located in the plane of the movable recording medium or so-called memory plane, the beam reflected from the memory plane is autocollimated and passes back through the focusing lens. A part of the beam enters the prism through the face AB, then emerges through the face AC and a circular light spot is formed in the plane corresponding to the circle of least confusion. If the point S2 is not located in the memory plane, the light spot is deformed and these deformations are detected by four juxtaposed cells placed in the plane of the circle of least confusion. Figure 1.

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