JPS54134428A - Focusing device - Google Patents

Focusing device

Info

Publication number
JPS54134428A
JPS54134428A JP4201178A JP4201178A JPS54134428A JP S54134428 A JPS54134428 A JP S54134428A JP 4201178 A JP4201178 A JP 4201178A JP 4201178 A JP4201178 A JP 4201178A JP S54134428 A JPS54134428 A JP S54134428A
Authority
JP
Japan
Prior art keywords
focusing
pyramid
elements
fed
prisms
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
JP4201178A
Other languages
Japanese (ja)
Inventor
Toshihiro Kondo
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP4201178A priority Critical patent/JPS54134428A/en
Publication of JPS54134428A publication Critical patent/JPS54134428A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To improve the focusing accuracy by arranging pyramid prisms on the optical axes of an objective lens and a focusing lens, respectivley.
CONSTITUTION: There are arranged on the optical axis 3 of an objective lens 1 and on the optical ascis 4 of a focusing lens 2 in parallel with the former, respectively, both a pyramid prism 5, which has its apex angle larger than two times of the complementrary angle of the critical angle for total reflection so that it is free from the total reflection, and a prism 8 which has a pyramid recess. The lights incident upon the lenses 1 and 2 are focused through the prisms 5 and 8, irises 6 and 9 and focusing lenses 11 and 12 upon light receiving elements 7 and 10. The outputs of the two elements 7 and 10 are fed to a differential amplifier 13 so that a luminous display device 14 is operated, when the difference inbetween becomes zero, to display the focused condition. Thus, sufficient quantities of lights can be fed to the elements 7 and 10 so that the desired objects can be attained.
COPYRIGHT: (C)1979,JPO&Japio
JP4201178A 1978-04-10 1978-04-10 Focusing device Pending JPS54134428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4201178A JPS54134428A (en) 1978-04-10 1978-04-10 Focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4201178A JPS54134428A (en) 1978-04-10 1978-04-10 Focusing device

Publications (1)

Publication Number Publication Date
JPS54134428A true JPS54134428A (en) 1979-10-18

Family

ID=12624232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4201178A Pending JPS54134428A (en) 1978-04-10 1978-04-10 Focusing device

Country Status (1)

Country Link
JP (1) JPS54134428A (en)

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