Photocopying – Projection printing and copying cameras – With cathode ray tube for light source
Patent
1983-11-29
1985-06-04
Hix, L. T.
Photocopying
Projection printing and copying cameras
With cathode ray tube for light source
355 68, 354 76, G03B 2772, G03B 2780
Patent
active
045211043
ABSTRACT:
An apparatus and method for producing photographic records of transparencies comprising a standard television monitor including a cathode ray tube having a raster and operable to generate a flying spot of light on the raster at a standard television sweep rate. The apparatus includes and the method uses a standard camera and a support for supporting the transparency between the raster and camera. Light from the flying spot passes through the transparency and is monitored by a photoelectric detector in advance of light passing through the same transparency areas being viewed by the camera lens. The photoelectric detector is connected by an inverse electronic feedback to the input of the cathode ray tube to vary the intensity of the flying spot inversely to the intensity of the light sensed by the detector. This produces a negative luminous image on the raster. The camera lens views an image which is a composite of the transparency and raster images and which has a compressed brightness range.
REFERENCES:
patent: 3183766 (1965-05-01), Takasaka et al.
patent: 3472952 (1969-10-01), Alway
patent: 4265532 (1981-05-01), McIntosh
Hix L. T,.
Rutledge Della
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