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:
Oct. 16, 1990
Filed:
Aug. 01, 1989
Takeo Fujimura, Nagaokakyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed are a correction lens system used in the process of producing the fluorescent screen of a color picture tube in order to reduce the positional deviation (mislanding) of the landing point of an electron beam projected to form a picture from the position of the corresponding fluorescent substance in the mosaic of the fluorescent screen, and a method of manufacturing the correction lens system. The correction lens system includes a first correction lens provided with a smooth curved surface for correcting the optical path of exposure rays for producing the fluorescent mosaic and a second correction lens provided with a discontinuous curved surface. The optical path of the exposure rays is corrected to the desired optical path by the refraction of the rays through the first and second correction lenses. The discontinuous curved surface of the second correction lens is produced by dividing a lens having a smooth curved surface into a plurality of ribbon like elements along division lines which are parallel to each other in one direction, rearranging the ribbon like elements with the respective ends reversed without changing the original arranging order between adjacent ribbon like elements, and re-bonding the ribbon like elements at the respective cut surfaces.