Claims
- 1. A catadioptric lens system comprising in the order of the transmission of a regular light ray:
- a first single lens;
- a main mirror lens;
- a counter mirror located on the object side in front of the first single lens, and
- a field lens system, wherein the catadioptric lens system satisfies the following conditions:
- (1) d.sub.CM >0
- (2) f.sub.1 .gtoreq.1.5f
- (3) 0.14f.ltoreq.d.sub.2 .ltoreq.0.53f
- (4) f.sub.FL >0,
- wherein reference symbol d.sub.CM represents the distance between the reflecting face of the counter mirror and the front face of the first single lens, d.sub.CM being positive, as the counter mirror is on the object side in front of the first single lens, reference symbol f.sub.1 represents the focal length of the first single lens, reference symbol f represents the focal length of the catadioptric lens system, reference symbol d.sub.2 represents the air separation between the first single lens and the main mirror lens, and reference symbol f.sub.FL represents the focal length of the field lens system.
- 2. The catadioptric lens system according to claim 1, in which the first single lens and the main mirror lens consist of glass of the same type.
- 3. The catadioptric lens system according to claim 1, comprising a reflecting-refracting counter mirror.
- 4. The catadioptric lens according to claim 3, comprising a reflecting-refracting counter mirror mounted to a central portion of the front lens.
- 5. The catadioptric lens system according to claim 1, comprising a centrally bored front lens.
- 6. The catadioptric lens system according to claim 1, comprising a centrally bored main mirror lens.
- 7. The catadioptric lens system according to claim 1, comprising a counter mirror possessing a variable position within the objective.
- 8. The catadioptric lens system according to claim 6, comprising a field lens system possessing a variable position within the objective.
- 9. The catadioptric lens system according to claim 1, comprising optical elements made from material which is transparent beyond the visual light spectral range.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7753/80 |
Oct 1980 |
CHX |
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CROSS REFERENCE TO RELATED APPLICATIONS
This application is related to my previously copending U.S. application Ser. No. 967,973, filed Aug. 12, 1978, now U.S. Pat. No. 4,273,425, granted June 16, 1981 and Ser. No. 280,244, filed July 6, 1981, entitled "High Speed Catadioptric Lens System", now U.S. Pat. No. 4,398,809, granted Aug. 16, 1983. This application is a continuation-in-part application of my copending parent application Ser. No. 308,798, filed Oct. 5, 1981, now U.S. Pat. No. 4,456,343, granted June 26, 1984 and entitled "High Speed Catadioptric Objective Lens System".
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
308798 |
Oct 1981 |
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