Illumination control system for a film scanner

Details Illumination control system for a film scanner Illumination control system for a film scanner

1996-09-27

1998-09-15

Metjahic, Safet

Photocopying

Projection printing and copying cameras

Illumination systems or details

347246, 348 97, G03B 2772

Patent

active

058087257

ABSTRACT:
In a telecine film scanner having an aperture area setting servo loop to establish output light intensity in response to commanded light intensity settings followed by operation of a lamp current intensity servo loop during film scanning at the established aperture area position, the affect of the aperture area setting on the lamp current intensity servo loop gain is compensated for by means of a gain compensation circuit in the current intensity servo loop that operates to make the current intensity servo loop gain reciprocally proportional to the commanded light intensity settings, at least for settings above a minimum threshold setting. Any input gain adjustments, such as for different film types, in the commanded light intensity signal applied to the lamp current intensity servo loop are additionally compensated for by a reciprocal gain adjustment in the servo loop.

REFERENCES:
patent: 4092530 (1978-05-01), Wise
patent: 4746987 (1988-05-01), Traino et al.
patent: 4814791 (1989-03-01), Ohara et al.
patent: 5514864 (1996-05-01), Mu-Tung et al.
patent: 5528288 (1996-06-01), Sandor et al.

Affiliated with

Also associated with

Rating

Illumination control system for a film scanner does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Illumination control system for a film scanner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Illumination control system for a film scanner will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-93758