JPS5742061A - Adjuster for quantity of light - Google Patents

Adjuster for quantity of light

Info

Publication number
JPS5742061A
JPS5742061A JP55118608A JP11860880A JPS5742061A JP S5742061 A JPS5742061 A JP S5742061A JP 55118608 A JP55118608 A JP 55118608A JP 11860880 A JP11860880 A JP 11860880A JP S5742061 A JPS5742061 A JP S5742061A
Authority
JP
Japan
Prior art keywords
variable
knob
constitution
density
variable resistance
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
JP55118608A
Other languages
Japanese (ja)
Inventor
Hiroaki Takeda
Kyo Tanaka
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 JP55118608A priority Critical patent/JPS5742061A/en
Priority to US06/294,572 priority patent/US4467246A/en
Priority to GB8125794A priority patent/GB2090003B/en
Priority to DE19813133619 priority patent/DE3133619A1/en
Publication of JPS5742061A publication Critical patent/JPS5742061A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/522—Projection optics
    • G03B27/525—Projection optics for slit exposure
    • G03B27/526—Projection optics for slit exposure in which the projection optics move
    • G03B27/527—Projection optics for slit exposure in which the projection optics move as a whole in a translatory movement

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To control the quantity of light of a light source, and set copying density approximately linearly with the movement extent of the knob of a density setter by the constitution wherein a fixed resistance is connected partially in parallel to a variable resistance, and a control device is activated by the output voltage of the variable output lead-out terminal provided on the variable resistance side. CONSTITUTION:This is a device of changing the control voltage to a control circuit 2 by the movement of an output lead-out terminal 7 acting cooperatively with a knob thereby controlling the quantity of electricity to be conducted from an electric power source 10 to a light source 1, wherein the terminal 4 at the center M of the resistances of a variable resistance VR1 and the terminal 5 between a variable resitance VR1 and a stationary resistance R3 are connected to parallel to part of the variable resistance VR1. With such constitution, the relation between the movement extent of the knob of a density setting device 3 and the rate of change of copying density is approximately linear.
JP55118608A 1980-08-25 1980-08-28 Adjuster for quantity of light Pending JPS5742061A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP55118608A JPS5742061A (en) 1980-08-28 1980-08-28 Adjuster for quantity of light
US06/294,572 US4467246A (en) 1980-08-28 1981-08-20 Light quantity controller and input device
GB8125794A GB2090003B (en) 1980-08-25 1981-08-24 Electrophotographic copier
DE19813133619 DE3133619A1 (en) 1980-08-25 1981-08-25 IMAGE GENERATION DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55118608A JPS5742061A (en) 1980-08-28 1980-08-28 Adjuster for quantity of light

Publications (1)

Publication Number Publication Date
JPS5742061A true JPS5742061A (en) 1982-03-09

Family

ID=14740763

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55118608A Pending JPS5742061A (en) 1980-08-25 1980-08-28 Adjuster for quantity of light

Country Status (1)

Country Link
JP (1) JPS5742061A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0195070A (en) * 1987-10-08 1989-04-13 Sanyo Electric Co Ltd Image forming device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0195070A (en) * 1987-10-08 1989-04-13 Sanyo Electric Co Ltd Image forming device

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