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Matched Photoconductor Array

IP.com Disclosure Number: IPCOM000098735D
Original Publication Date: 1959-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Schwartz, RS: AUTHOR

Abstract

Many applications require that the illuminated resistivity of each photoconductor 1-8 in an array 9 be standardized at a given value. Direct control of the characteristics of all of the photoconductors in the array being difficult and expensive, indirect control of resistivity is accomplished by a photographic film filter 10. When developed filter 10 is mounted over the photoconductor array 9 to form a complete package. Areas 11-18, which overlie photoconductors 1-8, are shaded to the extent required to attenuate the light striking the related photoconductor to achieve the standard illuminated resistivity.

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Matched Photoconductor Array

Many applications require that the illuminated resistivity of each photoconductor 1-8 in an array 9 be standardized at a given value. Direct control of the characteristics of all of the photoconductors in the array being difficult and expensive, indirect control of resistivity is accomplished by a photographic film filter 10. When developed filter 10 is mounted over the photoconductor array 9 to form a complete package. Areas 11-18, which overlie photoconductors 1-8, are shaded to the extent required to attenuate the light striking the related photoconductor to achieve the standard illuminated resistivity.

To produce filter 10, the respective photoconductors 1-9 are connected through plug 19 to common ground 20 and in series circuits with batteries, amplifiers and lamps 41-48 to ground. Circuits for photoconductors 7 and 8, which include batteries 27 and 28 and amplifiers 37 and 38, are shown as examples. The photoconductor array is illuminated by lamp 49, which is connected to battery 50 via timer 51 to control the exposure time. After exposure, the film is developed and fixed, and then placed over the array to form a moisture tight seal over the photoconductors as well as a balancing filter.

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