JPS54113356A - Range finder for camera - Google Patents

Range finder for camera

Info

Publication number
JPS54113356A
JPS54113356A JP2065978A JP2065978A JPS54113356A JP S54113356 A JPS54113356 A JP S54113356A JP 2065978 A JP2065978 A JP 2065978A JP 2065978 A JP2065978 A JP 2065978A JP S54113356 A JPS54113356 A JP S54113356A
Authority
JP
Japan
Prior art keywords
light
preset time
differential amplifier
short
photoelectric converting
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.)
Granted
Application number
JP2065978A
Other languages
Japanese (ja)
Other versions
JPS615127B2 (en
Inventor
Tokuichi Tsunekawa
Toshio Sakane
Tetsuya Taguchi
Masahiko Ogawa
Shuichi Tamura
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP2065978A priority Critical patent/JPS54113356A/en
Priority to US06/013,294 priority patent/US4291223A/en
Priority to DE19792906942 priority patent/DE2906942A1/en
Priority to FR7904730A priority patent/FR2418444A1/en
Priority to GB7906714A priority patent/GB2017446B/en
Publication of JPS54113356A publication Critical patent/JPS54113356A/en
Priority to US06/138,316 priority patent/US4636053A/en
Priority to GB08124383A priority patent/GB2101830B/en
Publication of JPS615127B2 publication Critical patent/JPS615127B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To highly accurately measure the distance to an object from short to long ranges by receiving the reflected light from the object with a photoelectric converting element so that the output signals and the signals delayed a preset time are differentially amplified by a differential amplifier.
CONSTITUTION: When a shutter button is depressed with a camera directed to an object, a lens mount is pulled toward infinity by a spring SP1 so that light from a light emitting element ED1 scanns the object from short to long ranges. A photoelectric converting element PD1 receives the light reflected from the object so that the resultant output signals and the signals delayed a preset time by a delay circuit are differentially amplified by a differentially amplifying circuit. The position, where the polarity of the output of the differential amplifier is reversed, is detected through a comparator circuit to deenergize an electromagnet Mg1 so that the stop pawl AM1 of an armature lever engages with a ratchet wheel G2 to stop the movement of the lens mount thereby to position a photographic lens LS5.
COPYRIGHT: (C)1979,JPO&Japio
JP2065978A 1978-02-24 1978-02-24 Range finder for camera Granted JPS54113356A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2065978A JPS54113356A (en) 1978-02-24 1978-02-24 Range finder for camera
US06/013,294 US4291223A (en) 1978-02-24 1979-02-21 Distance detecting device
DE19792906942 DE2906942A1 (en) 1978-02-24 1979-02-22 DISTANCE MEASURING DEVICE
FR7904730A FR2418444A1 (en) 1978-02-24 1979-02-23 DEVICE FOR DETECTION OF DISTANCE BETWEEN AN OBJECT AND THE DEVICE, ESPECIALLY FOR PHOTOGRAPHIC DEVICES
GB7906714A GB2017446B (en) 1978-02-24 1979-02-26 Autofocussing system
US06/138,316 US4636053A (en) 1978-02-24 1980-04-08 Distance detecting device
GB08124383A GB2101830B (en) 1978-02-24 1981-08-10 A distance detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2065978A JPS54113356A (en) 1978-02-24 1978-02-24 Range finder for camera

Publications (2)

Publication Number Publication Date
JPS54113356A true JPS54113356A (en) 1979-09-04
JPS615127B2 JPS615127B2 (en) 1986-02-15

Family

ID=12033331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2065978A Granted JPS54113356A (en) 1978-02-24 1978-02-24 Range finder for camera

Country Status (1)

Country Link
JP (1) JPS54113356A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6064525A (en) * 1983-07-29 1985-04-13 ア−ル・アラン・ベルチヤ− A/d converting and d/a converting method and device
JPS61195307A (en) * 1985-02-26 1986-08-29 Nippon Steel Corp Range finder
JPS63501526A (en) * 1985-08-12 1988-06-09 アデルマン，デビツド　アンドリユ− High speed 3D surface digitizer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6064525A (en) * 1983-07-29 1985-04-13 ア−ル・アラン・ベルチヤ− A/d converting and d/a converting method and device
JPS61195307A (en) * 1985-02-26 1986-08-29 Nippon Steel Corp Range finder
JPS63501526A (en) * 1985-08-12 1988-06-09 アデルマン，デビツド　アンドリユ− High speed 3D surface digitizer

Also Published As

Publication number Publication date
JPS615127B2 (en) 1986-02-15

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