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. 15, 1980
Filed:
Oct. 28, 1977
Takehiko Ueyama, Mobara, JP;
Masahiro Nishizawa, Mobara, JP;
Eiichi Yamazaki, Ichihara, JP;
Iwao Ogura, Tokyo, JP;
Hitachi, Ltd., , JP;
Abstract
A method of forming a stripe type phosphor screen on inner surface of a face plate of a color picture tube or CRT through the irradiation with light stripes. A single linear light source is employed in combination with a plurality of juxtaposed prisms between the face plate and the linear light source with the taper angles of the prisms being continuously varied so that a plurality of virtual linear light sources may be observed from any points on the inner surface of the face plate with the distances between mid-points of the virtual linear light sources taking optimum values at respective positions on the inner surface of the face plate. With such arrangement, an improved phosphor screen composed of phosphor stripes of three colors having uniform stripe width can be formed over the whole inner surface of the face plate by using a single linear light source without requiring driving apparatus for moving the light source to different positions.