JPS6413510A - Phase difference detector - Google Patents

Phase difference detector

Info

Publication number
JPS6413510A
JPS6413510A JP16889687A JP16889687A JPS6413510A JP S6413510 A JPS6413510 A JP S6413510A JP 16889687 A JP16889687 A JP 16889687A JP 16889687 A JP16889687 A JP 16889687A JP S6413510 A JPS6413510 A JP S6413510A
Authority
JP
Japan
Prior art keywords
calculated
offset
difference
signals
charge corresponding
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
JP16889687A
Other languages
Japanese (ja)
Other versions
JPH07104480B2 (en
Inventor
Nozomi Ozaki
Takashi Mitsuida
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP62168896A priority Critical patent/JPH07104480B2/en
Publication of JPS6413510A publication Critical patent/JPS6413510A/en
Publication of JPH07104480B2 publication Critical patent/JPH07104480B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Measurement Of Optical Distance (AREA)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To execute a calculation at high speed, and also, with high accuracy which is eliminated an offset, by offsetting an offset contained in a charge corresponding to a difference value between signals to be calculated, by an offset which is derived when the signal to be calculated does not exist. CONSTITUTION:The titled detecting device is constituted of a first and a second signal generating means for generating a pair of signals to be calculated R, B whose phase difference is detected, an arithmetic means 3 for executing a difference arithmetic processing, and a synchronizing signal generating means 4 for controlling an operation of the whole device. In such a state, in the arithmetic means 3, a charge corresponding to a difference of a level between the signals to be calculated, and a difference of levels generated when the signal to be calculated does not exist, namely, a charge corresponding to an offset are offset in a differential integrator 42. In such a way, a differential calculation can be executed with high accuracy, and also, the circuit constitution is simplified, and the device can be miniaturized.
JP62168896A 1987-07-08 1987-07-08 Phase difference detector Expired - Lifetime JPH07104480B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62168896A JPH07104480B2 (en) 1987-07-08 1987-07-08 Phase difference detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62168896A JPH07104480B2 (en) 1987-07-08 1987-07-08 Phase difference detector

Publications (2)

Publication Number Publication Date
JPS6413510A true JPS6413510A (en) 1989-01-18
JPH07104480B2 JPH07104480B2 (en) 1995-11-13

Family

ID=15876576

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62168896A Expired - Lifetime JPH07104480B2 (en) 1987-07-08 1987-07-08 Phase difference detector

Country Status (1)

Country Link
JP (1) JPH07104480B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02309220A (en) * 1989-05-24 1990-12-25 Tokyo Electric Power Co Inc:The Optical fiber-type distributed temperature measuring apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59208513A (en) * 1983-05-12 1984-11-26 Canon Inc Focus detecting device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59208513A (en) * 1983-05-12 1984-11-26 Canon Inc Focus detecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02309220A (en) * 1989-05-24 1990-12-25 Tokyo Electric Power Co Inc:The Optical fiber-type distributed temperature measuring apparatus

Also Published As

Publication number Publication date
JPH07104480B2 (en) 1995-11-13

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