JPS5538535A - Focus detecting optical device - Google Patents

Focus detecting optical device

Info

Publication number
JPS5538535A
JPS5538535A JP11150278A JP11150278A JPS5538535A JP S5538535 A JPS5538535 A JP S5538535A JP 11150278 A JP11150278 A JP 11150278A JP 11150278 A JP11150278 A JP 11150278A JP S5538535 A JPS5538535 A JP S5538535A
Authority
JP
Japan
Prior art keywords
lens
optical axis
focus
photo detector
zoom lens
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
JP11150278A
Other languages
Japanese (ja)
Inventor
Yoshisada Hayamizu
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 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 Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP11150278A priority Critical patent/JPS5538535A/en
Publication of JPS5538535A publication Critical patent/JPS5538535A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE: To make possible focus detection of good accuracy despite change in the condition of iris by directing part of the luminous flux incident to a zoom lens to the focus-detecting photo detector before the aperture diaphragm.
CONSTITUTION: The zoom lens consists of a focusing lens F which is movable in the optical axis direction, a variator lens V, a compensator lens C and a fixed prime lens P. A reflecting mirror M is disposed with a suitable inclination to the optical axis of the zoom lens symmetricaly with respect to one plane inclusive the optical axis of the zoom lens betweent the compensator lens C and a diaphragm aperture S, and a condenser lens L and a focus-detecting photo detector D are disposed on the straight line parallel to the optical axis of the luminous flux reflected by the reflecting mirror M and within the abovementioned plane. Since part of the luminous flux from the lens is led to the focus-detecting photo detector before the aperture diaphragm in this way, the quantity of light reaching the photo detector may be taken sufficiently similarly to that at the full aperture even in the dark state of the iris has been stopped down and the degradation in the accuracy in focus detection owing to degraded S/N is obviated.
COPYRIGHT: (C)1980,JPO&Japio
JP11150278A 1978-09-11 1978-09-11 Focus detecting optical device Pending JPS5538535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11150278A JPS5538535A (en) 1978-09-11 1978-09-11 Focus detecting optical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11150278A JPS5538535A (en) 1978-09-11 1978-09-11 Focus detecting optical device

Publications (1)

Publication Number Publication Date
JPS5538535A true JPS5538535A (en) 1980-03-18

Family

ID=14562915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11150278A Pending JPS5538535A (en) 1978-09-11 1978-09-11 Focus detecting optical device

Country Status (1)

Country Link
JP (1) JPS5538535A (en)

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