JPS5552008A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS5552008A
JPS5552008A JP12494578A JP12494578A JPS5552008A JP S5552008 A JPS5552008 A JP S5552008A JP 12494578 A JP12494578 A JP 12494578A JP 12494578 A JP12494578 A JP 12494578A JP S5552008 A JPS5552008 A JP S5552008A
Authority
JP
Japan
Prior art keywords
output
integrating circuit
lens
detecting means
output voltage
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
JP12494578A
Other languages
Japanese (ja)
Inventor
Masabumi Kikuchi
Masayuki Miyake
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP12494578A priority Critical patent/JPS5552008A/en
Publication of JPS5552008A publication Critical patent/JPS5552008A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To make possible continuous focusing by providing differentiating and integrating circuits, etc. and discriminating whether the position of a lens is before or behind the position where it focuses.
CONSTITUTION: The detecting signal of a photo detecting means 4 is supplied to an integrating circuit 22 by way of a shift register 10 or the like. As the output of the integrating circuit, the differential crest value output integrated along the characteristic curve 40 of crest type according to the distance D on the optical path between a lens 2 and photo detecting means 4 is obtained. Here, if the focus is matched, the output level of the integrating circuit 22 becomes maximum because the image on the photo detecting means 4 is high in contrast. The distance D on the optical path of this time is let to be d. Next, the output of the integrating circuit 22 is supplied to an integrating circuit 24 and when D=d, no output voltage is generated at all. When D<d, the output voltage in the positive direction is obtainable and when D>d, the output voltage in the negative direction. According to this output, the lens 2 is moved by a motor 26, whereby the continuous focusing may be performed.
COPYRIGHT: (C)1980,JPO&Japio
JP12494578A 1978-10-11 1978-10-11 Automatic focusing device Pending JPS5552008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12494578A JPS5552008A (en) 1978-10-11 1978-10-11 Automatic focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12494578A JPS5552008A (en) 1978-10-11 1978-10-11 Automatic focusing device

Publications (1)

Publication Number Publication Date
JPS5552008A true JPS5552008A (en) 1980-04-16

Family

ID=14898076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12494578A Pending JPS5552008A (en) 1978-10-11 1978-10-11 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS5552008A (en)

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