Optical pickup device wherein the astigmatic converged beam spot

Details Optical pickup device wherein the astigmatic converged beam spot Optical pickup device wherein the astigmatic converged beam spot

1987-06-30

1988-08-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

047679212

ABSTRACT:
An optical pickup device in which a laser light source is so disposed that one of two dividing lines of a photo-detector having at least four sensing portions symmetrically divided by the dividing lines so as to detect focusing deviation of a light beam onto a signal surface of a record disc, is aligned with the tangential direction of the signal track at the portion where the light beam is projected onto the signal surface, whereby the optical pickup is free from a wrong focusing control due to erroneous detection even during track jumping.

REFERENCES:
patent: 4585933 (1986-04-01), Ando
patent: 4616354 (1986-10-01), Yoshida

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