Aperture device of a lens capable of close proximity flash photo

Details Aperture device of a lens capable of close proximity flash photo Aperture device of a lens capable of close proximity flash photo

1980-08-28

1981-11-03

Griffin, Donald A.

350255, 354196, G03B 1503, G03B 300, G02B 702

Patent

active

042982626

ABSTRACT:
A lens includes a flash unit including a ring-shaped irradiating light source disposed around the lens barrel symmetrically about the optical axis, a diaphragm for varying the aperture diameter, an optical system having a first focusing mode in which focusing operation can be effected with respect to an object lying within a predetermined distance range and second focusing mode in which focusing operation can be effected with respect to an object lying at a distance shorter than said predetermined distance range, a control device for varying the aperture diameter in accordance with the focusing operation when said optical system is in the first focusing mode, and a device for holding the aperture diameter in the vicinity of its minimum diameter for the focusing operation when said optical system is in the second focusing mode.

REFERENCES:
patent: 3447441 (1969-06-01), Ort
patent: 3680459 (1972-08-01), Okura
patent: 3841735 (1974-10-01), Katagiri et al.
patent: 3851952 (1974-12-01), Werz et al.
patent: 4034387 (1977-07-01), Ohtaki et al.

Affiliated with

Also associated with

Rating

Aperture device of a lens capable of close proximity flash photo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Aperture device of a lens capable of close proximity flash photo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aperture device of a lens capable of close proximity flash photo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1062038