Projection lens system for projection type television

Details Projection lens system for projection type television Projection lens system for projection type television

1990-12-12

1993-10-19

Arnold, Bruce Y.

Optical: systems and elements

Lens

With field curvature shaping

359648, 359649, G02B 300, G02B 900

Patent

active

052551229

ABSTRACT:
A projection lens system for a projection type television having a cathode-ray tube with a panel having a fluorescent inner surface for projecting an image onto a screen. The projection lens system includes a plurality of lens groups, the lens group positioned at a side nearest to the cathode-ray tube including, in successive order from a side toward the screen, a lens having a concave surface on the screenn side a transparent medium, and the cathode-ray tube panel having a fluorescent inner surface, the lens group attenuating at least a part of a wavelength region of the light emitted on the fluorescent surface so as to improve contrast while reducing observance of a ghost image due to multiple reflection without substantial impairment in at least one of brightness and luminance. More particularly, the attenuation is provided by the concave lens having at least one surface dyed in a predetermined color.

REFERENCES:
patent: 4761063 (1988-08-01), Yoshioka et al.
patent: 4792217 (1988-12-01), Yoshioka
patent: 4948237 (1990-08-01), Hirata et al.
patent: 4987483 (1991-01-01), Tsukagoshi

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