Light dosing device

Details Light dosing device Light dosing device

1977-05-31

1982-09-21

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 83, G03B 2772

Patent

active

043504388

ABSTRACT:
Disclosed is a device for dosing light from a light source in accordance with the intensity of light impinging upon a material to be exposed, comprising: a photosensitive element located in the beam path of the light source, comprising a photoresistor having an ohmic resistance inversely proportional to the intensity of light impinging thereon and providing an output voltage; a capacitor arranged in series with the photosensitive element; means, preferably in the form of a switch bridging the capacitor, responsive to switching-on of the light source for initiating charging of the capacitor; switching means arranged in series with said capacitor for varying the charging time thereof, whereby the exposure time of said material to be exposed can be varied by a predetermined ratio to produce a desired shade of gray; optional means for amplifying the output voltage of the photosensitive element; means for comparing the output voltage of the photosensitive element with a reference voltage to produce an output signal; and means for controlling the amount of light impinging upon the material to be exposed in response to the output signal from the comparing means.

REFERENCES:
patent: 1973512 (1934-09-01), Smith
patent: 3222983 (1965-12-01), Ouchi
patent: 4017180 (1977-04-01), Yen et al.

Affiliated with

Also associated with

Rating

Light dosing device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light dosing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light dosing device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2074059