Focus detecting optical device utilizing two plane parallel plat

Details Focus detecting optical device utilizing two plane parallel plat Focus detecting optical device utilizing two plane parallel plat

1992-08-21

1993-09-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359639, 369 4423, G01J 120

Patent

active

052431789

ABSTRACT:
In a focus detecting optical system wherein a beam transmitted through an objective optical system is divided to thereby effect focus detection, a beam reflected by an optical disk is transmitted through an objective lens and a half mirror and is condensed by a condensing lens. The light beam from this condensing lens is divided by a dividing member comprising a pair of obliquely disposed plane parallel plates and becomes divided beams parallel to each other, and these divided beams arrive at a four-division detector. The dividing lines of this detector are on the meridional plane of the objective optical system.

REFERENCES:
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4712205 (1987-12-01), Smid et al.
patent: 4723845 (1988-02-01), Mizutani et al.

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