Projection lens apparatus for rear projection television

Details Projection lens apparatus for rear projection television Projection lens apparatus for rear projection television

1993-02-26

1994-06-14

Ben, Loha

Optical: systems and elements

Lens

With field curvature shaping

359714, 359770, 359654, 359746, 359695, G02B 960, G02B 1318, G02B, G02B

Patent

active

053215516

ABSTRACT:
A projection lens apparatus for a rear projection television. The projection lens apparatus includes a first lens in which the negative power of the lens gradually increases from the central portion of the lens, having almost no power, to the peripheral portion, a second lens having a strong positive power, a third lens in which the positive power of the lens gradually increases from the central portion, having almost no power, to the peripheral portion, a fourth lens having a positive power at the central portion and a negative power at the peripheral portion and a fifth lens having a strong negative power, wherein the first to fifth lenses are sequentially arranged along an optical axis toward a cathode ray tube from a screen. The various lenses perform different functions. Accordingly, the projection distance and the size of the lens are reduced, thereby reducing the size of the system. Also, the various aberrations generated through the projection lenses are effectively corrected, to thereby improve performance of the image formation and the peripheral light quantity.

REFERENCES:
patent: 4859040 (1989-08-01), Kitagishi et al.
patent: 4924244 (1990-05-01), Kataoka et al.
patent: 5048940 (1991-09-01), Ueda et al.

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