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. 08, 1991
Filed:
Apr. 12, 1989
Takashi Sugahara, Nagaokakyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An in-line color cathode ray tube utilizing a finely perforated shadow mask is provided, which includes a highly evacuated envelope having an longitudinal axis and a funnel section which is closed at one end by a generally cylindrical neck section having an in-line electron gun assembly and is closed at the opposite end by a faceplate, an exposure device for forming a mosaic pattern of element color emissive phosphor dots on a screen area of the faceplate, which includes a generally elongated light source, and a slitted member adapted to be disposed between the elongated light source and the faceplate of the evacuated envelope. The slitted member has a slit-shaped light transmissive area defined therein while leaving a light intercepting area around the respective light transmissive area. The light transmissive area has a generally intermediate portion with opposite ends being displaced in a direction parallel to the longitudinal axis of the evacuated envelope.