System for focusing an optical head onto a flat surface

Details System for focusing an optical head onto a flat surface System for focusing an optical head onto a flat surface

1982-03-29

1985-01-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

044954077

ABSTRACT:
A system for focusing an optical head onto a flat surface has a mechanism for moving the optical head in the direction of the optical axis of the head and a mechanism for moving an objective lens in the optical head in the direction of the optical axis of the lens. A laser beam projected from the objective lens of the optical head is reflected on the flat surface, is reflected on the beam splitter, and is introduced into a detector unit. The detector unit thus generates a focusing signal having a level responsive to the distance between the objective lens and the surface. The optical head is lowered by the mechanism for moving the optical head in accordance with the focusing signal when it passes a predetermined point, and is operated to locate the focal point of the objective lens on the surface. Thereafter, the mechanism for moving the optical head becomes inoperative, and the mechanism for moving the objective lens is operated. This mechanism operates in accordance with the focusing signal and locates the focal point of the objective lens always on the surface.

REFERENCES:
patent: 4329578 (1982-05-01), Rosner
patent: 4370038 (1983-01-01), Kimura
patent: 4374324 (1983-02-01), Van Rosmalen et al.
patent: 4416513 (1983-11-01), Uesugi

Affiliated with

Also associated with

Rating

System for focusing an optical head onto a flat surface does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for focusing an optical head onto a flat surface, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for focusing an optical head onto a flat surface will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-568141