JPS552212A - Copying apparatus - Google Patents

Copying apparatus

Info

Publication number
JPS552212A
JPS552212A JP7387278A JP7387278A JPS552212A JP S552212 A JPS552212 A JP S552212A JP 7387278 A JP7387278 A JP 7387278A JP 7387278 A JP7387278 A JP 7387278A JP S552212 A JPS552212 A JP S552212A
Authority
JP
Japan
Prior art keywords
light
lamps
detector
change
fluorescent lamp
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.)
Pending
Application number
JP7387278A
Other languages
Japanese (ja)
Inventor
Mitsuaki Kamiyama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7387278A priority Critical patent/JPS552212A/en
Publication of JPS552212A publication Critical patent/JPS552212A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the change in image density with a change in the quantity of light of exposure lamps by directly detecting the change in the quantity of light of fluorescent lamps which cannot be achieve only by tube wall temperature controlling of the fluorescent lamps and automatically controlling the developing bias voltage according to the detection contents. CONSTITUTION:A pair of fluorescent lamps 2, 2 as exposure lamps are provided in the position below an original platen 1. A detector 6 is provided near the fluorescent lamp 2. The detector 6 detects the quantity of light of the fluorescent lamp 2 with its photometric element such as Cds element or photodiode and converts the same to an electric signal. The output signal of the detector 6 is supplied a control circuit 7 consisting of a light quantity detecting circuit 8, changeover switch 9 and bias resistances 101 thru 103 of respectively different resistance values. The light quantity detecting circuit 8 compares the quantity of light of the fluorescent lamp 2 having been detected and the preset optimum exposure and controls the changeover switch 9 according to this, thereby controlling the developing bias voltage being applied to a developing device 12.
JP7387278A 1978-06-19 1978-06-19 Copying apparatus Pending JPS552212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7387278A JPS552212A (en) 1978-06-19 1978-06-19 Copying apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7387278A JPS552212A (en) 1978-06-19 1978-06-19 Copying apparatus

Publications (1)

Publication Number Publication Date
JPS552212A true JPS552212A (en) 1980-01-09

Family

ID=13530708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7387278A Pending JPS552212A (en) 1978-06-19 1978-06-19 Copying apparatus

Country Status (1)

Country Link
JP (1) JPS552212A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223237A2 (en) * 1985-11-18 1987-05-27 Kabushiki Kaisha Toshiba Automatic developing apparatus
JPH03239272A (en) * 1990-02-17 1991-10-24 Canon Inc Illuminating device and copying device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5243439A (en) * 1975-10-03 1977-04-05 Ricoh Co Ltd Generator for the bias voltage for the electrophotographic copying machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5243439A (en) * 1975-10-03 1977-04-05 Ricoh Co Ltd Generator for the bias voltage for the electrophotographic copying machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223237A2 (en) * 1985-11-18 1987-05-27 Kabushiki Kaisha Toshiba Automatic developing apparatus
JPH03239272A (en) * 1990-02-17 1991-10-24 Canon Inc Illuminating device and copying device

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