JPH04353875A - Automatic sheet feeding device - Google Patents

Automatic sheet feeding device

Info

Publication number
JPH04353875A
JPH04353875A JP3129797A JP12979791A JPH04353875A JP H04353875 A JPH04353875 A JP H04353875A JP 3129797 A JP3129797 A JP 3129797A JP 12979791 A JP12979791 A JP 12979791A JP H04353875 A JPH04353875 A JP H04353875A
Authority
JP
Japan
Prior art keywords
light emitting
emitting body
density
feeding device
change
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3129797A
Other languages
Japanese (ja)
Other versions
JP3031744B2 (en
Inventor
Hitoshi Fujimoto
Katsuaki Hirai
Masaki Naito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3129797A priority Critical patent/JP3031744B2/en
Publication of JPH04353875A publication Critical patent/JPH04353875A/en
Application granted granted Critical
Publication of JP3031744B2 publication Critical patent/JP3031744B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To offer an automatic sheet feeding device in which the change of an emitted light quantity in the light emitting body of a density detecting means is made small so as to stably detect density and to prolong the life of the light emitting body.
CONSTITUTION: The density detecting means 17 is actuated by every detection signal by a sheet detecting sensor means S2. Therefore, the change of the emitted light quantity caused by the change of the internal resistance of the light emitting body which occurs because of the temperature rise of the light emitting body is made small, so that the density is stably detected and the life of the light emitting body is prolonged.
COPYRIGHT: (C)1992,JPO&Japio
JP3129797A 1991-05-31 1991-05-31 Document density detector Expired - Fee Related JP3031744B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3129797A JP3031744B2 (en) 1991-05-31 1991-05-31 Document density detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3129797A JP3031744B2 (en) 1991-05-31 1991-05-31 Document density detector

Publications (2)

Publication Number Publication Date
JPH04353875A true JPH04353875A (en) 1992-12-08
JP3031744B2 JP3031744B2 (en) 2000-04-10

Family

ID=15018471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3129797A Expired - Fee Related JP3031744B2 (en) 1991-05-31 1991-05-31 Document density detector

Country Status (1)

Country Link
JP (1) JP3031744B2 (en)

Also Published As

Publication number Publication date
JP3031744B2 (en) 2000-04-10

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Legal Events

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