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JPS57169710A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS57169710A
JPS57169710A JP5491181A JP5491181A JPS57169710A JP S57169710 A JPS57169710 A JP S57169710A JP 5491181 A JP5491181 A JP 5491181A JP 5491181 A JP5491181 A JP 5491181A JP S57169710 A JPS57169710 A JP S57169710A
Authority
JP
Japan
Prior art keywords
range finding
lens
driving means
automatic focusing
focusing device
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
JP5491181A
Other languages
Japanese (ja)
Inventor
Hiroshi Makino
Katsuji Ishikawa
Wataru Hasegawa
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.)
West Electric Co Ltd
Original Assignee
West Electric 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 West Electric Co Ltd filed Critical West Electric Co Ltd
Priority to JP5491181A priority Critical patent/JPS57169710A/en
Priority to DE19823212902 priority patent/DE3212902C2/en
Priority to FR8206304A priority patent/FR2503883B1/en
Publication of JPS57169710A publication Critical patent/JPS57169710A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE: To prevent the erroneous range finding, by stopping the function of a range finding means while a lens driving means is driven.
CONSTITUTION: The device consists of a range finding means 1, which transmits ultrasonic waves to an object and receives the reflection waves to measure the time from teansmission to receiving and outputs a proper lens position signal on a basis of this time, and a driving means 2 which drives a lens in accordance with the output of this range finding means 1. The device is so constituted that the function of the range finding means 1 is stopped while the lens driving means 2 is driven.
COPYRIGHT: (C)1982,JPO&Japio
JP5491181A 1981-04-10 1981-04-10 Automatic focusing device Pending JPS57169710A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP5491181A JPS57169710A (en) 1981-04-10 1981-04-10 Automatic focusing device
DE19823212902 DE3212902C2 (en) 1981-04-10 1982-04-06 Device for automatic distance adjustment
FR8206304A FR2503883B1 (en) 1981-04-10 1982-04-09 AUTOMATIC FOCUSING DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5491181A JPS57169710A (en) 1981-04-10 1981-04-10 Automatic focusing device

Publications (1)

Publication Number Publication Date
JPS57169710A true JPS57169710A (en) 1982-10-19

Family

ID=12983776

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5491181A Pending JPS57169710A (en) 1981-04-10 1981-04-10 Automatic focusing device

Country Status (3)

Country Link
JP (1) JPS57169710A (en)
DE (1) DE3212902C2 (en)
FR (1) FR2503883B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07254598A (en) * 1994-11-07 1995-10-03 Semiconductor Energy Lab Co Ltd Manufacture of semiconductor device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54126023A (en) * 1978-03-23 1979-09-29 Canon Inc Optical device
JPS55100532A (en) * 1979-01-02 1980-07-31 Polaroid Corp Automatic focus control camera

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2813932A1 (en) * 1978-03-31 1979-10-04 Agfa Gevaert Ag Automatic taking lens focussing device - has counter to compare duration of measuring pulses derived from signal transit time with measuring frequency
GB2019595B (en) * 1978-04-25 1982-09-29 Polaroid Corp Automatic focusing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54126023A (en) * 1978-03-23 1979-09-29 Canon Inc Optical device
JPS55100532A (en) * 1979-01-02 1980-07-31 Polaroid Corp Automatic focus control camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07254598A (en) * 1994-11-07 1995-10-03 Semiconductor Energy Lab Co Ltd Manufacture of semiconductor device

Also Published As

Publication number Publication date
FR2503883B1 (en) 1986-02-28
DE3212902A1 (en) 1982-10-28
DE3212902C2 (en) 1985-01-17
FR2503883A1 (en) 1982-10-15

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