The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 1981
Filed:
Aug. 28, 1980
Hideyo Nozawa, Ohmiya, JP;
Hideshi Naito, Tokyo, JP;
Nippon Kogaku K.K., Tokyo, JP;
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.