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. 07, 2000
Filed:
Jul. 15, 1997
Applicant:
Inventor:
Hiroshi Hayakawa, Fujinomiya, JP;
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21V / ;
U.S. Cl.
CPC ...
362230 ; 362249 ; 362293 ; 362800 ;
Abstract
A casing of darkroom illumination equipment is composed of a base assembly and a lid. A substrate mounting light emitting diodes, a milky colored plate, a filter and a transparent plate are placed in the casing. The light emitting diode which emits the light for which spectrum has its peak at the wavelength of 585 nm is used so as not to affect photographic color paper. The filter eliminates the light having wavelengths in the lower slope apart from the peak in the spectrum and allows only the light having the wavelengths at the peak and in the proximity of the peak to pass through.