Title:
【発明の名称】カラー受像管螢光面作成用補正レンズ系
Document Type and Number:
Japanese Patent JP2585775
Kind Code:
B2
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.
Inventors:
FUJIMURA TAKEO
Application Number:
JP33224788A
Publication Date:
February 26, 1997
Filing Date:
December 28, 1988
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G11B23/087; A23L5/10; A47J37/12; B60R21/16; B60R21/20; B60R21/276; B60R21/30; F23Q2/16; G02B3/08; H01J9/227; (IPC1-7): H01J9/227; G02B3/08
Domestic Patent References:
| JP49100954A | ||||
| JP4911274A |
Attorney, Agent or Firm:
Hiroshi Murakami (1 outside)