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:
Dec. 30, 1986
Filed:
Oct. 16, 1985
Yutaka Ichihara, Yokohama, JP;
Nobutaka Magome, Kawasaki, JP;
Yutaka Iizuka, Fujisawa, JP;
Shuji Kunimatsu, Tokyo, JP;
Tomonari Inaba, Tokyo, JP;
Nippon Kogaku K. K., Tokyo, JP;
Abstract
A focusing screen in a split image coincidence type range finder provided with an objective lens forming an imaging plane comprises a plurality of light diffusing portions each of which has a surface inclined with respect to the imaging plane. A number of minute depressions or projections are formed on the inclined surface. The depressions or projections are arranged in the form of a matrix along a first direction and a second direction intersecting each other and symmetrical with respect to a fixed direction parallel to the inclined surface and the imaging plane. Each of the depressions or projections is of a pyramidic shape having as the base a parallelogram having first and second sides parallel to the first direction and third and fourth sides parallel to the second direction and extended in the fixed direction. Each of the depressions or projections is arranged so that each side of the parallelogram is common to a side of another adjacent parallelogram.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile