JPS5570825A - Aperture device of lens - Google Patents

Aperture device of lens

Info

Publication number
JPS5570825A
JPS5570825A JP14507578A JP14507578A JPS5570825A JP S5570825 A JPS5570825 A JP S5570825A JP 14507578 A JP14507578 A JP 14507578A JP 14507578 A JP14507578 A JP 14507578A JP S5570825 A JPS5570825 A JP S5570825A
Authority
JP
Japan
Prior art keywords
aperture
cam
driving member
blade driving
face
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
JP14507578A
Other languages
Japanese (ja)
Other versions
JPS5948364B2 (en
Inventor
Koji Seki
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.)
Tamron Co Ltd
Original Assignee
Tamron 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 Tamron Co Ltd filed Critical Tamron Co Ltd
Priority to JP53145075A priority Critical patent/JPS5948364B2/en
Publication of JPS5570825A publication Critical patent/JPS5570825A/en
Publication of JPS5948364B2 publication Critical patent/JPS5948364B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Diaphragms For Cameras (AREA)

Abstract

PURPOSE: To make aperture scale to an equal sapcing and reduce the turning torque of automatic aperture by disposing a cam mechansim between the aperture scale member and aperture blade driving member and eliminating the spring energizing force acting upon the blade driving member during automatic aperture control operation.
CONSTITUTION: As a drive ring 1 turns, an aperture blade 2 is moved and aperture opening is adjusted. There is an interlocking pin 3 to the ring 1 and is connected to a lever 3a. A cam face 5a is formed on the inside face of the turnable cam ring 5 and a pinch fixed to the arc-form lever 12 pivotally fitted to the lens-barrel engages to this face. The pushing element 12b at the free end of the lever 12 engages with the interlocking pin 3 and the pin 4 is pushed to the cam face 5a by a spring 13. Since the manual control of the lens aperture is accomplished by way of the cam mechanism, the aperture scale may be formed to an equal spacing and in the automatic control it is directly applied to the aperture blade driving member without going through this cam mechansim but at this time the spring energizing force to the blade driving member is eliminated and therefore the torque for rotating may be considerably reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP53145075A 1978-11-24 1978-11-24 lens aperture device Expired JPS5948364B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53145075A JPS5948364B2 (en) 1978-11-24 1978-11-24 lens aperture device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53145075A JPS5948364B2 (en) 1978-11-24 1978-11-24 lens aperture device

Publications (2)

Publication Number Publication Date
JPS5570825A true JPS5570825A (en) 1980-05-28
JPS5948364B2 JPS5948364B2 (en) 1984-11-26

Family

ID=15376794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53145075A Expired JPS5948364B2 (en) 1978-11-24 1978-11-24 lens aperture device

Country Status (1)

Country Link
JP (1) JPS5948364B2 (en)

Also Published As

Publication number Publication date
JPS5948364B2 (en) 1984-11-26

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