Reverse telephoto agron objective lens

Details Reverse telephoto agron objective lens Reverse telephoto agron objective lens

1991-12-23

1993-10-26

Arnold, Bruce Y.

Optical: systems and elements

Lens

Reverse telephoto

359749, G02B 1304

Patent

active

052571360

ABSTRACT:
An air spaced reverse telephoto objective lens for use in a laser chemical vapor deposition system or the like having a quartz plate window. The objective lens includes a negative component having a first air-spaced doublet wherein each doublet element is made of crown glass and a negative meniscus crown glass element spaced from said first air-spaced doublet. The objective lens further includes an aperture stop, a positive component including second and third doublet components for effecting color correction, and a pair of bi-convex elements for effecting spherical aberration correction. The objective lens provides a common focal plane for both illuminating light and laser light passing through the objective lens and the quartz plate window.

REFERENCES:
patent: 3033082 (1962-05-01), Merigold
patent: 3277784 (1966-10-01), Hudson
patent: 3369853 (1968-02-01), Tolle
patent: 3656839 (1972-04-01), Trotta
patent: 3799655 (1974-03-01), Laiken
patent: 3870401 (1975-03-01), Muszumanski
patent: 4291951 (1981-09-01), Ikemori
patent: 4368957 (1983-01-01), Chirra
patent: 4437735 (1984-03-01), Momiyama
patent: 5159493 (1992-10-01), Tsutsumi
Patent Abstracts of Japan vol. 4, No. 153, P-33, Oct. 25, 1980 & JP-A-55 100 519, Canon, Jul. 31, 1980.
Patent Abstracts of Japan vol. 15, No. 076, C-809, Feb. 21, 1991 & JP-A-02 301 556, Mitsubishi, Dec. 13, 1990.

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