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JPS54143166A - Illumination light detector - Google Patents

Illumination light detector

Info

Publication number
JPS54143166A
JPS54143166A JP2867178A JP2867178A JPS54143166A JP S54143166 A JPS54143166 A JP S54143166A JP 2867178 A JP2867178 A JP 2867178A JP 2867178 A JP2867178 A JP 2867178A JP S54143166 A JPS54143166 A JP S54143166A
Authority
JP
Japan
Prior art keywords
period
signals
maximum level
image pickup
illumination light
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
JP2867178A
Other languages
Japanese (ja)
Other versions
JPS6326841B2 (en
Inventor
Riichi Yasue
Takeshi Karasuno
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 JP2867178A priority Critical patent/JPS54143166A/en
Publication of JPS54143166A publication Critical patent/JPS54143166A/en
Publication of JPS6326841B2 publication Critical patent/JPS6326841B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Transforming Light Signals Into Electric Signals (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Measurement Of Optical Distance (AREA)

Abstract

PURPOSE: To reduce the disturbance light thereby to improve the S/N ratio by equipping an illumination light detector with a maximum level detecting circuit for detecting the maximum level of video signals and with a frequency controller for varying the image pickup period and the optically varying period in accordance with the level detected.
CONSTITUTION: An illimination device 9 having a projecting period and a optically varying period intermittently irradiates an object 1 with a preset period. An image pickup device 10 picks up the reflected beam, which is interrupted while coming from the object 1, with a preset period so that the video signals are fed consecutively to a subtracting device 6. A drive circuit 5 generates drive signals for driving the device 9, 10 and 6 in synchronism with a preset period. In the illumination light detector thus constructed, Maximum level detectors 15 and 16 for detecting the maximum levels of the video signals at the input and output sides of the device 6 are provided together with a period control device 14 which is receptive of the maximum level signals for feeding the timing signals for the period control to the drive circuit 5, thereby to vary the image pickup period of the device 10 and the polarizing period of the device 9.
COPYRIGHT: (C)1979,JPO&Japio
JP2867178A 1978-03-15 1978-03-15 Illumination light detector Granted JPS54143166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2867178A JPS54143166A (en) 1978-03-15 1978-03-15 Illumination light detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2867178A JPS54143166A (en) 1978-03-15 1978-03-15 Illumination light detector

Publications (2)

Publication Number Publication Date
JPS54143166A true JPS54143166A (en) 1979-11-08
JPS6326841B2 JPS6326841B2 (en) 1988-05-31

Family

ID=12254963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2867178A Granted JPS54143166A (en) 1978-03-15 1978-03-15 Illumination light detector

Country Status (1)

Country Link
JP (1) JPS54143166A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5710107A (en) * 1980-06-20 1982-01-19 Canon Inc Control system for scanning signal
JPS6078304A (en) * 1983-10-05 1985-05-04 Agency Of Ind Science & Technol Signal processing system for detecting two-dimensional position
JPS60200103A (en) * 1984-03-26 1985-10-09 Hitachi Ltd Optical cutting line extraction circuit
JPS6177706A (en) * 1984-09-25 1986-04-21 Nippon Denso Co Ltd Device for recognizing riding position of vehicle driver
JPS6266253A (en) * 1985-09-18 1987-03-25 Konishiroku Photo Ind Co Ltd Radiograph information reading method
JPS6281519A (en) * 1985-10-04 1987-04-15 Mitsubishi Electric Corp Range finder
JPS62201309A (en) * 1986-02-28 1987-09-05 Komatsu Ltd Road nature measurement system using ccd camera

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5710107A (en) * 1980-06-20 1982-01-19 Canon Inc Control system for scanning signal
JPS6078304A (en) * 1983-10-05 1985-05-04 Agency Of Ind Science & Technol Signal processing system for detecting two-dimensional position
JPS60200103A (en) * 1984-03-26 1985-10-09 Hitachi Ltd Optical cutting line extraction circuit
JPS6177706A (en) * 1984-09-25 1986-04-21 Nippon Denso Co Ltd Device for recognizing riding position of vehicle driver
JPS6266253A (en) * 1985-09-18 1987-03-25 Konishiroku Photo Ind Co Ltd Radiograph information reading method
JPS6281519A (en) * 1985-10-04 1987-04-15 Mitsubishi Electric Corp Range finder
JPS62201309A (en) * 1986-02-28 1987-09-05 Komatsu Ltd Road nature measurement system using ccd camera

Also Published As

Publication number Publication date
JPS6326841B2 (en) 1988-05-31

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