Temperature compensated time exposure control circuit
AssigneeMinnesota Mining and Manufacturing Company
InventorFarrel M. Maki
Life of this patent
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Abstract
A temperature compensated control circuit in an electrophotographic copy machine having a machine "ready" portion for presenting a machine ready condition and with which an intermediate copy sheet is used for exposure to the output of a light source including a time adjustable control circuit portion providing a time period during which the light source is energized. The time adjustable control circuit portion has a temperature sensitive element for shortening the time period as the temperature within the machine increases and for lengthening the time period as the temperature within the machine decreases. Such automatic temperature adjustment compensates the exposure time versus temperature relationship of the intermediate sheet.
Claims6
Control circuitry usable with a machine "ready" circuit portion for controlling the output of a light source including:
- a time adjustable control circuit portion operatively connected to the machine "ready" circuit portion and to the light source, said time control circuit portion operable after the machine "ready" circuit portion presents a machine "ready" condition for providing a timed period during which the light source is energized, said time adjustable control circuit portion including a temperature sensitive element for shortening said timed period as the temperature sensed by said temperature sensitive element increases and lengthening said timed period as the temperature sensed decreases.
Dependencies are inferred from the claim text.