JPS63284512A - Auto-focusing device - Google Patents

Auto-focusing device

Info

Publication number
JPS63284512A
JPS63284512A JP62118801A JP11880187A JPS63284512A JP S63284512 A JPS63284512 A JP S63284512A JP 62118801 A JP62118801 A JP 62118801A JP 11880187 A JP11880187 A JP 11880187A JP S63284512 A JPS63284512 A JP S63284512A
Authority
JP
Japan
Prior art keywords
light
reception
output
light receiving
adder
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
JP62118801A
Other languages
Japanese (ja)
Inventor
Takashi Azumi
Toshio Murakami
Kenji Sano
Hironobu Sato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62118801A priority Critical patent/JPS63284512A/en
Publication of JPS63284512A publication Critical patent/JPS63284512A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To eliminate the change of the shape of a reception light spot due to the variance of reflectivity of an object to improve the focusing precision by detecting reception light spot positions on respective light receiving elements by output signals from first and second light receiving parts and adding these outputs to turn the distance ring of a photographic lens.
CONSTITUTION: An auto-focusing device consists of a first optical system consisting of a light emitting element 1 and a projection lens 3, two light reception optical systems consisting of light reception position detecting elements omitted in the figure and light receiving lenses, a processing circuit 4, a motor 5, and a potentiometer 6. Respective reception light sot positions are detected in first and second computing elements 24 and 25 by output signals from light receiving elements 10 and 11 of light reception optical systems of this device. Outputs of computing elements 24 and 25 are added by an adder 26, and the output of the adder 267 is supplied to a subtractor 27 together with a set voltage Vc from the potentiometer 6. A distance ring 1 of a photographic lens 9 is turned by the output of a driving circuit 30 in accordance with the output of the adder 26 to focus the lens 9 on the object.
COPYRIGHT: (C)1988,JPO&Japio
JP62118801A 1987-05-18 1987-05-18 Auto-focusing device Pending JPS63284512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62118801A JPS63284512A (en) 1987-05-18 1987-05-18 Auto-focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62118801A JPS63284512A (en) 1987-05-18 1987-05-18 Auto-focusing device

Publications (1)

Publication Number Publication Date
JPS63284512A true JPS63284512A (en) 1988-11-21

Family

ID=14745455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62118801A Pending JPS63284512A (en) 1987-05-18 1987-05-18 Auto-focusing device

Country Status (1)

Country Link
JP (1) JPS63284512A (en)

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