JPS57108813A - Photographing lens barrel having focus detecting function - Google Patents

Photographing lens barrel having focus detecting function

Info

Publication number
JPS57108813A
JPS57108813A JP18659580A JP18659580A JPS57108813A JP S57108813 A JPS57108813 A JP S57108813A JP 18659580 A JP18659580 A JP 18659580A JP 18659580 A JP18659580 A JP 18659580A JP S57108813 A JPS57108813 A JP S57108813A
Authority
JP
Japan
Prior art keywords
lens
switch
mirror
focus
detection
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
JP18659580A
Other languages
Japanese (ja)
Inventor
Yoshihisa Yonetani
Akihiko Hashimoto
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP18659580A priority Critical patent/JPS57108813A/en
Publication of JPS57108813A publication Critical patent/JPS57108813A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/282—Autofocusing of zoom lenses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To minimize the size of a lens and to realize the detection with high accuracy for an auto-focus camera, by setting a half mirror among the lens groups to lead the detected light. CONSTITUTION:A half mirror 19 is set at the position near the optical axis between lens groups 6a and 6b. Thus the detecting light flux is led to a detection element (an array of photoelectric converting elements or charge coupling elements, etc.) via a compensating lens 21, mirrors 22 and 24. In this case the lens 21 is set equivalent to a rear lens group 6b, and at the same time an optical path reaching the mirror 24 from the mirror 22 is set parallel to the optical axis. As a result, no effect is given to the detection of focus although a holding barrel 4 means back and forth due to the zooming operation, etc. A control circuit 43 works when a switch 37 is closed in coupling to the rotation of a diaphragm lever due to a releasing action or when a prefocus switch 45 and a real focus switch 46 are manually closed. Thus the focusing is carried out with the drive of a motor 15.
JP18659580A 1980-12-25 1980-12-25 Photographing lens barrel having focus detecting function Pending JPS57108813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18659580A JPS57108813A (en) 1980-12-25 1980-12-25 Photographing lens barrel having focus detecting function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18659580A JPS57108813A (en) 1980-12-25 1980-12-25 Photographing lens barrel having focus detecting function

Publications (1)

Publication Number Publication Date
JPS57108813A true JPS57108813A (en) 1982-07-07

Family

ID=16191294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18659580A Pending JPS57108813A (en) 1980-12-25 1980-12-25 Photographing lens barrel having focus detecting function

Country Status (1)

Country Link
JP (1) JPS57108813A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542972A (en) * 1982-09-06 1985-09-24 Olympus Optical Co., Ltd. Automatic focus controlling camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542972A (en) * 1982-09-06 1985-09-24 Olympus Optical Co., Ltd. Automatic focus controlling camera

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