JPS5474423A - Focal point detecting circuit - Google Patents

Focal point detecting circuit

Info

Publication number
JPS5474423A
JPS5474423A JP14174877A JP14174877A JPS5474423A JP S5474423 A JPS5474423 A JP S5474423A JP 14174877 A JP14174877 A JP 14174877A JP 14174877 A JP14174877 A JP 14174877A JP S5474423 A JPS5474423 A JP S5474423A
Authority
JP
Japan
Prior art keywords
detecting
detecting element
image
focal point
cells
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
JP14174877A
Other languages
Japanese (ja)
Inventor
Sadatsugu Miura
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP14174877A priority Critical patent/JPS5474423A/en
Publication of JPS5474423A publication Critical patent/JPS5474423A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To make it possible to accurately detect the focal point of an object of any size by using a detecting element of large area having a small detecting cell.
CONSTITUTION: The image signals having passed through an objective lens 21 are reflected by a half-mirror to reach an image detecting element 23. A monolithic photodiode, MOS photoelectric element or CCD photoelectric detecting element is used as the image detecting element 23. When the real image of the object is to be focused by the objective lens 21 upon the image detecting element 23, it is possible to generate the signals which have their optical contrast highly varied. If the respective cells of the detecting element 23 are made sufficiently small and if the output signals of the adjacent detecting cells are compared, there is a case, in which a remarkably difference resides in the output signal intensities of the two adjacent detecting cells. The output signals of the detecting cells 31 to 33 are compared so that the correct focal point is formed on the object at any distnace.
COPYRIGHT: (C)1979,JPO&Japio
JP14174877A 1977-11-26 1977-11-26 Focal point detecting circuit Pending JPS5474423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14174877A JPS5474423A (en) 1977-11-26 1977-11-26 Focal point detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14174877A JPS5474423A (en) 1977-11-26 1977-11-26 Focal point detecting circuit

Publications (1)

Publication Number Publication Date
JPS5474423A true JPS5474423A (en) 1979-06-14

Family

ID=15299271

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14174877A Pending JPS5474423A (en) 1977-11-26 1977-11-26 Focal point detecting circuit

Country Status (1)

Country Link
JP (1) JPS5474423A (en)

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