Device for correcting brightness roll-off at an end of a lamp

Details Device for correcting brightness roll-off at an end of a lamp Device for correcting brightness roll-off at an end of a lamp

1995-09-19

1997-05-27

Husar, Stephen F.

Illumination

Photographic lighting

Including specific light modifier

362217, 362218, 362255, 362345, 362396, G03B 1502

Patent

active

056325479

ABSTRACT:
An apparatus comprises an imaging camera including a frame part and a tubular lamp for providing light for the camera. The apparatus further comprises a device connected between the frame part of the camera and an end of the lamp for (i) grounding out electrostatic charge on an outer surface of the lamp, (ii) dissipating heat generated by the lamp and (iii) gradually correcting brightness roll-off at the end of the lamp to produce a uniform illumination of an imaging field of the camera. The device includes (i) a reflector portion for reflecting light from the lamp and (ii) a locating portion for locating the reflector portion relative to the lamp such that light reflected from the reflector portion cooperates with light from the lamp to gradually correct brightness roll-off at the end of the lamp to produce the uniform illumination of the imaging field of the camera.

REFERENCES:
patent: 3377482 (1968-04-01), Podany
patent: 5469303 (1995-11-01), Wun et al.

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