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. 04, 1980
Filed:
Dec. 11, 1978
Matsuo Ochi, Neyagawa, JP;
Keisuke Miyoshi, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A projection tube projects in front a visible light image produced by irradiating a target having a fluorescent screen formed on one surface thereof with an electron beam emitted from an electron gun. The projection tube includes an X-ray shield disposed to cover the surface of the target excluding the fluorescent screen, whereby the X-ray generated by irradiating the fluorescent screen on the target with the electron beam are shielded to prevent the transmission of the X-rays to the front of the projection tube, and also the X-ray shield has the effect of dissipating the heat from the target and simplifying the target positioning operation in the manufacture of projection tubes.