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:
Jul. 11, 1978
Filed:
Feb. 24, 1976
Kuniharu Osakabe, Mobara, JP;
Hitachi, Ltd., , JP;
Abstract
A correction lens disposed between the exposure light source and a glass panel provided with a shadow mask at the exposure step of manufacturing a color television CRT and adaped to compensate for the tendency of the phosphor stripes being formed in a wavy configuration. The correction lens has such a characteristic that, when the light source is observed through the correction lens at the side of the shadow mask, the light source is viewed as displaced in appearance toward the correction lens by a certain constant distance on the optical axis independently of the viewing angle, whereby the image of a linear light source or the linear moving path of a point source of light is made to extend substantially in parallel with the length of the slot of the shadow mask.