Optical apparatus for optically reading and recording informatio

Details Optical apparatus for optically reading and recording informatio Optical apparatus for optically reading and recording informatio

1995-05-15

1997-02-11

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4412, 369112, G02B 704, G02B 2740, G11B 700

Patent

active

056023839

ABSTRACT:
An optical head for use in an optical recording apparatus contains a lens element that permits independent setting of the magnification and numerical aperture for a forward optical system and a rearward optical system. The optical head includes a light beam emitting assembly that emits a beam of light and a light beam separating assembly. A light beam focusing element focuses a forward light beam onto an optical recording medium. The light beam emitted from the light beam emitting assembly follows a forward optical path passing through the light beam separating assembly as a non-diffracted light beam and is focused onto the optical recording medium. A rearward light beam is reflected from the optical recording medium and follows a rearward optical path passing through the focusing element and the light beam separating assembly such that the rearward light beam is deflected to a light detection device. The lens element is positioned in at least one of the forward optical path and the rearward optical path.

REFERENCES:
patent: 5313441 (1994-05-01), Imai et al.
patent: 5402407 (1995-03-01), Eguchi et al.
patent: 5422870 (1995-06-01), Kojima et al.
patent: 5428584 (1995-06-01), Yoshida et al.
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5496995 (1996-03-01), Kato et al.

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