Claims
- 1. A pupilimage reversal device included in an optical system, comprising:
- a positive reflective element for reflecting with positive power; and
- input/output optics for intercepting an input optical bundle incident from the optical system, and., after a predetermined number of fold paths within the pupil/image reversal device, reintroducing the optical bundle into the optical system;
- said positive reflective element and said input/output optics being cooperatively configured such that an intercepted optical bundle is directed along a predetermined number of fold paths, at least one of which includes the positive reflective element, until being directed on an exit path to the input/output optics, such that the focused and folded optical bundle forms a pupil at a desired image location.
- 2. The pupil/image reversal device of claim 1, wherein said input/output optics comprises:
- an input reflective element; and
- an output reflective element;
- said input and output reflective elements being transmissive to an optical bundle incident at transmitangles of incidence, and reflective to an optical bundle incident at a reflect-angles of incidence;
- such that an optical bundle incident to said input effective element at a transmit-angle of incidence is introduced into the pupil/image reversal device, and within the device, the optical bundle propagates along predetermined internal fold paths incident to said input and output reflective elements at reflect-angles of incidence, until being directed on an exit path to said output reflective element at a transmit angle of incidence for reintroduction into the optical system.
- 3. The pupil/image reversal device of claim 2, further including at least one intermediate fold element for reflecting an incident optical bundle.
- 4. The pupil/image reversal device of claim 2, wherein said positives reflective element and said input and output reflective elements are surfaces formed on a prism of refractive material.
- 5. The pupil/image reversal device of claim 4, wherein said input and output reflective surfaces use TIR for reflection.
- 6. The pupil/image reversal device of claim 4, wherein said prism further includes at .least one intermediate fold surface for reflecting an optical bundle.
- 7. The pupil/image reversal device of claim 4, wherein said positive reflective surface is coated reflective.
- 8. The pupil/image reversal device of claim 4, wherein said input and output reflective surfaces are coated with an anti-reflective coating.
Parent Case Info
This is a division of application Ser. No. 07/546,602, filed Jun. 29, 1990, now U.S. Pat. No. 5,136,421.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
1836562 |
Waide |
Dec 1931 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
546602 |
Jun 1990 |
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