Focus detection device having a mechanism for adjusting light-re

Details Focus detection device having a mechanism for adjusting light-re Focus detection device having a mechanism for adjusting light-re

1991-02-11

1993-11-02

Adams, Russell E.

354402, 354408, G03B 1336

Patent

active

052588041

ABSTRACT:
A device for adjusting the focus adjusting state of an objective lens includes a lens assembly having a field lens located in the vicinity of a predetermined imaging plane of the objective lens, and a pair of secondary imaging lenses. A line connecting the optical axes of the pair of secondary imaging lenses is located off the optical axis of the objective lens. A main body is provided for supporting the lens assembly and a light receiving sensor device is provided for receiving light distributions passing through the pair of secondary imaging lenses. A holding structure is provided for movably supporting the light receiving sensor device on the main body. Such structure allows accurate focusing of objects both on and off the optical axis of the objective lens.

REFERENCES:
patent: 4728785 (1988-03-01), Ohnuki et al.
patent: 4774539 (1988-09-01), Suda et al.
patent: 4777506 (1988-10-01), Hiramatsu et al.
patent: 4792669 (1988-12-01), Ohnuki et al.
patent: 4808808 (1989-02-01), Karasaki et al.
patent: 4901102 (1990-02-01), Karasaki et al.
patent: 4959677 (1990-09-01), Suda et al.
patent: 4992819 (1991-02-01), Ohtaka et al.

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