JPS54100723A - Electric circuit for camera - Google Patents

Electric circuit for camera

Info

Publication number
JPS54100723A
JPS54100723A JP755678A JP755678A JPS54100723A JP S54100723 A JPS54100723 A JP S54100723A JP 755678 A JP755678 A JP 755678A JP 755678 A JP755678 A JP 755678A JP S54100723 A JPS54100723 A JP S54100723A
Authority
JP
Japan
Prior art keywords
led
resistor
point
transistor
light
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
JP755678A
Other languages
Japanese (ja)
Inventor
Akira Takahashi
Shinichiro Koshiishi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP755678A priority Critical patent/JPS54100723A/en
Priority to US06/006,225 priority patent/US4305648A/en
Priority to DE2942435A priority patent/DE2942435C2/en
Priority to DE2954054A priority patent/DE2954054C2/en
Priority to DE2902891A priority patent/DE2902891C2/en
Publication of JPS54100723A publication Critical patent/JPS54100723A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent an erroneous display and the idle trip of a shutter by connecting a resistor in series with a light emitting element for exposure photometry so that warning means may be controlled by a transistor in response to the signals obtained from the resistor.
CONSTITUTION: In a timer circuit, a point B is connected through a resistor R1 with a point E, and a switch SW1 having two contacts 1 and 2 is connected between the point E and a DC power source EB. A deflection warning LED is connected through a resistor R2 between the points A and E. A transistor Tr1 is connected in parallel with the LED and has its base connected with the point B. Thus, if the outside light is bright, the transistor Tr1 is rendered conductive to put out the LED. If, on the contrary, the outside light is dark, the Tr1 is rendered inconductive to light the LED thereby to warn shortage of exposure. Thus, it is possible to eliminate the erroneous display of the LED and the idle trip of the shutter.
COPYRIGHT: (C)1979,JPO&Japio
JP755678A 1978-01-25 1978-01-25 Electric circuit for camera Pending JPS54100723A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP755678A JPS54100723A (en) 1978-01-25 1978-01-25 Electric circuit for camera
US06/006,225 US4305648A (en) 1978-01-25 1979-01-24 Electric circuits for use in camera
DE2942435A DE2942435C2 (en) 1978-01-25 1979-01-25 Electrical circuit for a camera
DE2954054A DE2954054C2 (en) 1978-01-25 1979-01-25 Circuit for displaying insufficient light conditions in a camera
DE2902891A DE2902891C2 (en) 1978-01-25 1979-01-25 Circuit for displaying insufficient light conditions in a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP755678A JPS54100723A (en) 1978-01-25 1978-01-25 Electric circuit for camera

Publications (1)

Publication Number Publication Date
JPS54100723A true JPS54100723A (en) 1979-08-08

Family

ID=11669065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP755678A Pending JPS54100723A (en) 1978-01-25 1978-01-25 Electric circuit for camera

Country Status (1)

Country Link
JP (1) JPS54100723A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49133027A (en) * 1973-03-20 1974-12-20
JPS5218312A (en) * 1975-08-02 1977-02-10 Minolta Camera Co Ltd Display circuit for the camera

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49133027A (en) * 1973-03-20 1974-12-20
JPS5218312A (en) * 1975-08-02 1977-02-10 Minolta Camera Co Ltd Display circuit for the camera

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