H - Electricity – 01 – J
Patent
H - Electricity
01
J
88/52, 313/35.34
H01J 29/56 (2006.01) G02B 3/02 (2006.01) G02B 17/08 (2006.01) H01J 29/12 (2006.01) H01J 29/60 (2006.01) H04N 5/74 (2006.01)
Patent
CA 1179724
TITLE OF THE INVENTION: PROJECTION TYPE CATHODE RAY TUBE WITH MASKING MEANS ABSTRACT OF THE DISCLOSURE: A projection cathode ray tube is provided with elements for correcting a spherical aberration in the optical system. These elements include a correction lens disposed in front of the tube and a masking member adjustably mounted on the lens. The masking member partially covers peripheral sur- face portions of the lens in an adjustable manner to obtain a high image resolution on the screen with a minimum decrease in the image brightness. Preferably, the masking member is removable or adjustable in the form of a masking tape or divided shutter attached to partial portions of the Front face of the lens for removing an undesired aberration with a minimized shuttering area. The projection tube comprises in combination with the correction lens, a tube envelope including a convex target and a concave mirror disposed op- posite to each other and having the same center of curva- ture. This structure with the adjustable masking achieves a high quality reception or image projection. 1344/ar - 1 -
394767
Gowling Lafleur Henderson Llp
Nec Kansai Ltd.
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