Method of guiding a light beam on an optical signal track

Details Method of guiding a light beam on an optical signal track Method of guiding a light beam on an optical signal track

1975-04-11

1976-08-17

La Roche, Eugene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

1791003C, 1791003V, 17910041L, 250570, G11B 700, G05B 100

Patent

active

039756300

ABSTRACT:
The principle of the Foucault knife edge method of testing lenses is utilized by providing an imperfect focus of the reading light beam on the signal track of a moving optical record and detecting the lateral distribution of light beyond the track to produce a tracking control while a centered detector utilizes the same light beam to read the information on the track. Since the Foucault principle is used and not ordinary shadow effect, the method is operable just as much with a translucent track on an opaque record as with an opaque track on a translucent record.

REFERENCES:
patent: 3138669 (1964-06-01), Rabinow et al.
patent: 3567855 (1971-03-01), Hamisch
patent: 3876841 (1975-04-01), Gijsbertus et al.

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