TV projection lens including a graded index element

Details TV projection lens including a graded index element TV projection lens including a graded index element

1992-10-05

1995-02-21

Look, Edward K.

Optical: systems and elements

Lens

With graded refractive index

359650, 359764, 359772, 359773, G02B 300

Patent

active

053924312

ABSTRACT:
A projection TV lens (60) includes first (64), second (66), third (70), and fourth (72) element-groups counted in numerical order and arranged on a common optical axis (62). The first, third, and fourth groups each include at least one lens element. The first and third group has positive power and the fourth group has negative power. The second group includes a first lens element (67) having negative power and having a graded refractive index.

REFERENCES:
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patent: 4568151 (1986-02-01), Mihara
patent: 4715693 (1987-12-01), Takase et al.
patent: 4810070 (1989-07-01), Suda et al.
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patent: 4900139 (1990-02-01), Kreitzer
patent: 4906079 (1990-03-01), Mihara et al.
patent: 4907866 (1990-03-01), Kitagishi et al.
patent: 4929065 (1990-05-01), Hagerty et al.
patent: 5029994 (1991-07-01), Aoki
patent: 5202992 (1993-04-01), Banno et al.

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