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:
Jan. 22, 1991
Filed:
Mar. 31, 1989
Applicant:
Inventor:
Kazuo Tsukagoshi, Nagaokakyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ; H04N / ;
U.S. Cl.
CPC ...
358 64 ; 358237 ; 358253 ; 313474 ; 313112 ; 350438 ;
Abstract
In a projection television set including red, green and blue CRTs, and red, green and blue projection lens systems, the green projection lens system is provided with a coating or a filter having a high reflecting coefficient against light below about 520 nm and above about 570 nm in wavelength. Therefore, unnecessary light, emitted from a green light source in the green projection lens system, can be reflected by the coating of filter so that only necessary light is passed. This allows for a projection television set which contains a color reproduction range closer to the color reproduction range of a standard television set.