Illumination unit for an optical apparatus

Details Illumination unit for an optical apparatus Illumination unit for an optical apparatus

1996-07-25

2000-02-22

Gray, David M.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 53, 359209, 359211, G03B 2742, G03B 2754, G02B 2608

Patent

active

060286601

ABSTRACT:
Illumination unit (2) for an optical system, including an illumination system (1) which comprises, in this order, a radiation source (3) and a first optical integrator (11). The illumination unit (2) further comprises a detection system (45) including a radiation-sensitive detector (47). The illumination system (1) comprises a second optical integrator (13). The two integrators (11, 13) enclose a prism system (15) comprising at least one prism (17). The prism system (15) has a coupling-out surface via which light can be coupled out of the illumination system (1), and an exit surface via which light can be coupled out of the prism system (15), without the intensity in the main light path being essentially influenced. The detection system (45) is arranged proximate to the exit surface of the prism system (15) and comprises light-integrating means.

REFERENCES:
patent: 5309198 (1994-05-01), Nakagawa
patent: 5343270 (1994-08-01), Sakakibara et al.
patent: 5798824 (1998-08-01), Kudo
"Optics Guide 3", Melles Griot, Irvine, CA. 1985, pp. 238-239. no date (month).

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