JPS63200849U

JPS63200849U -

Info

Publication number: JPS63200849U
Application number: JP9132187U
Authority: JP
Priority date: 1987-06-16
Filing date: 1987-06-16
Publication date: 1988-12-23

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す概略構成図
、第２図は濃度検出器の斜視図、第３図は制御系
のブロツク図、第４図は他の実施例を示す概略構
成図、第５図は同制御系のブロツク図、第６図も
他の実施例の概略構成図、第７図は同制御系のブ
ロツク図、第８図は濃度検出器の断面図、第９図
は作用を示すタイミングチヤート、第１０図は従
来の説明図である。２は原稿、５は感光体、８は濃度検出器。 Fig. 1 is a schematic diagram showing one embodiment of this invention, Fig. 2 is a perspective view of a concentration detector, Fig. 3 is a block diagram of a control system, and Fig. 4 is a schematic diagram showing another embodiment. , FIG. 5 is a block diagram of the same control system, FIG. 6 is a schematic diagram of another embodiment, FIG. 7 is a block diagram of the same control system, FIG. 8 is a sectional view of the concentration detector, and FIG. 9 is a block diagram of the same control system. 10 is a timing chart showing the operation, and FIG. 10 is a conventional explanatory diagram. 2 is an original, 5 is a photoreceptor, and 8 is a density detector.

Claims

[Claims for Utility Model Registration] (1) The density of the original 2 to be copied is detected from the reflected light from the original 2 or the electrostatic latent image formed on the photoreceptor 5, and the amount of charge is determined by the obtained detection signal. A document density detection device for a copying machine that controls copying parameters such as light exposure, developing bias, etc., and is configured to vary the density detection position of the document according to the copying magnification. (2) The density detection using the reflected light is performed by a sensor installed in the automatic document feeder, and based on the comparison result of the previous and current document densities, it is determined whether or not to perform a pre-scan to detect the density with the sensor on the main body side. A document density detection device according to Claim 1 of the Utility Model Registration Claim, characterized in that: (3) The density detection using reflected light is characterized in that the light source of a sensor provided with at least two light sources each having a different peak wavelength, provided in the automatic document feeder, is turned on alternately to capture signal output. A document density detection device according to claim 1 of the utility model registration claim.