JPS57141608A - Lens barrel enabling automatic adjustment of aperture diameter by object distance and guide number for flash photography - Google Patents

Lens barrel enabling automatic adjustment of aperture diameter by object distance and guide number for flash photography

Info

Publication number
JPS57141608A
JPS57141608A JP56027478A JP2747881A JPS57141608A JP S57141608 A JPS57141608 A JP S57141608A JP 56027478 A JP56027478 A JP 56027478A JP 2747881 A JP2747881 A JP 2747881A JP S57141608 A JPS57141608 A JP S57141608A
Authority
JP
Japan
Prior art keywords
cam
correction
aperture
object distance
flash photography
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
JP56027478A
Other languages
Japanese (ja)
Inventor
Keiji Enomoto
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 JP56027478A priority Critical patent/JPS57141608A/en
Publication of JPS57141608A publication Critical patent/JPS57141608A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Lens Barrels (AREA)

Abstract

PURPOSE:To perform correction automatically for flash photography, by deciding on an aperture diameter which corresponds to an object distance through a correction cam by switching performed in accordance with the indication of an aperture scale ring. CONSTITUTION:When an aperture scale ring 1 is rotated from an area A for normal photography to an area B for flash photography, an aperture deciding cam 12 is brought into contact with a stop member 22 by a spring 18. A correction cam is rotated, corresponding to respective guide numbers on an aperture scale, by a coupling lever 14 and a pin 16 on the correction cam 13. When a lens barrel member 5 is moved outward through the rotation of a focusing ring 2, the pin 16 on the correction cam 13 slides in contact with the cam surface 17 of the coupling lever 14 to move in the direction of an optical axis, so the correction cam 14 is rotated in accordance with the outward movement of the correction cam 13 to decide on an aperture, which corresponds to an object distance, by a cam surface 13a through a pin 19 on a bell crank 10. Thus, correction is performed automatically by the simple constitution.
JP56027478A 1981-02-26 1981-02-26 Lens barrel enabling automatic adjustment of aperture diameter by object distance and guide number for flash photography Pending JPS57141608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56027478A JPS57141608A (en) 1981-02-26 1981-02-26 Lens barrel enabling automatic adjustment of aperture diameter by object distance and guide number for flash photography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56027478A JPS57141608A (en) 1981-02-26 1981-02-26 Lens barrel enabling automatic adjustment of aperture diameter by object distance and guide number for flash photography

Publications (1)

Publication Number Publication Date
JPS57141608A true JPS57141608A (en) 1982-09-02

Family

ID=12222221

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56027478A Pending JPS57141608A (en) 1981-02-26 1981-02-26 Lens barrel enabling automatic adjustment of aperture diameter by object distance and guide number for flash photography

Country Status (1)

Country Link
JP (1) JPS57141608A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63237042A (en) * 1987-03-26 1988-10-03 Asahi Optical Co Ltd Electronically controlled camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63237042A (en) * 1987-03-26 1988-10-03 Asahi Optical Co Ltd Electronically controlled camera

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