Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1986-11-06
1989-02-21
Grimley, A. T.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 14R, G03G 1500
Patent
active
048069809
ABSTRACT:
The specification discloses apparatus by which multiple reproductions can be produced from an original, all reproductions from the same original being of substantially identical quality. An electrographic machine substantially uniformly charges an electrographic recording member to a predetermined initial voltage and imagewise exposes the charged recording member at a nominal exposure level to produce a latent charge image. The initial voltage level and the exposure level are process control parameters of the machine, which also includes a biased electrode for controlling deposition of toner to the latent charge image. Signals are produced and stored having values characteristic of (1) the level of at least one of the parameters and (2) the bias voltage level which are associated with a desired reproduction quality of an original. A comparison signal is produced by taking the signal values of the sensed parameters associated with latent charge images of successive reproductions of an original and comparing them with the stored signal values for the corresponding latent charge images of the same original. The bias voltage level associated with the latent charge image is varied in response to the comparison signal, thereby producing a developed image having substantially the same upright quality as that produced by the stored signal values.
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Patent Abstracts of Japan, vol. 9, No. 6, (P-326)(1729), Jan. 11, 1985.
Jamzadeh Fereidoon S.
Stoudt Michael D.
Eastman Kodak Company
Grimley A. T.
Pipala Ed
Sales Milton S.
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