JPS5514581A - In-focus detection unit - Google Patents

In-focus detection unit

Info

Publication number
JPS5514581A
JPS5514581A JP8799978A JP8799978A JPS5514581A JP S5514581 A JPS5514581 A JP S5514581A JP 8799978 A JP8799978 A JP 8799978A JP 8799978 A JP8799978 A JP 8799978A JP S5514581 A JPS5514581 A JP S5514581A
Authority
JP
Japan
Prior art keywords
signal
focus
terminal
outputted
focus lens
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
JP8799978A
Other languages
Japanese (ja)
Inventor
Hiroaki Tsuboi
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.)
Pioneer Video Corp
Universal Pioneer Corp
Original Assignee
Pioneer Video Corp
Universal Pioneer Corp
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 Pioneer Video Corp, Universal Pioneer Corp filed Critical Pioneer Video Corp
Priority to JP8799978A priority Critical patent/JPS5514581A/en
Publication of JPS5514581A publication Critical patent/JPS5514581A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE:To obtain accurate focus signal quickly with reduced malfunction, by detecting the signal representing the focus state from the output of the focus control amplifier, in video disc players. CONSTITUTION:The signal produced accompanied with the change in the shape of beam spot formed on the photo detection element split into four, for example, is fed to the terminals 1 and 2, and it is delivered to the focus control amplifier 22. Further, when the focus lens approaches from the reference position to the disc, the up-signal of focus lens is outputted to the terminal 23 and when apart, the focus lens down-signal is outputted. The focus lens is oscillated up and down by taking the reference signal as a center. Further, Q1 is turned off with the negative AC component at the terminal 23, then the in-focus signal is obtained at the terminal 24, and if the AC component is not outputted at the terminal 23, Q1 is turned on and the out-focus signal is obtained.
JP8799978A 1978-07-19 1978-07-19 In-focus detection unit Pending JPS5514581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8799978A JPS5514581A (en) 1978-07-19 1978-07-19 In-focus detection unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8799978A JPS5514581A (en) 1978-07-19 1978-07-19 In-focus detection unit

Publications (1)

Publication Number Publication Date
JPS5514581A true JPS5514581A (en) 1980-02-01

Family

ID=13930479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8799978A Pending JPS5514581A (en) 1978-07-19 1978-07-19 In-focus detection unit

Country Status (1)

Country Link
JP (1) JPS5514581A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57127207U (en) * 1981-01-30 1982-08-07
JPS57195901U (en) * 1981-06-08 1982-12-11

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57127207U (en) * 1981-01-30 1982-08-07
JPH0341287Y2 (en) * 1981-01-30 1991-08-30
JPS57195901U (en) * 1981-06-08 1982-12-11

Similar Documents

Publication Publication Date Title
JPS53110504A (en) Optical reproducing device
JPS5237445A (en) Lens system rendering variable characteristics of an image plane
JPS52147430A (en) Focus detection device
JPS5514581A (en) In-focus detection unit
GB1362984A (en) Rangefinder
JPS5697325A (en) Focus detecting method of camera
JPS5257825A (en) Automatic focus control device
JPS55127524A (en) Automatic focus control unit
JPS57123782A (en) Tracking device for correlative picture
JPS5514580A (en) Focus servo unit
JPS56158494A (en) Output control device for semiconductor laser
JPS5319805A (en) Automatic focusing optical device
JPS5642482A (en) White balance regulator of color video camera
JPS57133527A (en) Optical recorder and reproducer
JPS5674208A (en) Automatic focus adjusting device
JPS5769914A (en) Automatic gain controller
JPS5740222A (en) Light scanner
JPS5514583A (en) Protective unit for focus lens
JPS5629216A (en) Instantaneous photodetecting circuit
JPS57202179A (en) Automatic focusing device
JPS6477009A (en) Distance detection device using focus detection device
JPS57133525A (en) Automatic focusing system of optical information reader
JPS5537560A (en) Air-fuel ratio control system
JPS52153454A (en) Automatic focus controlling apparatus
JPS64935A (en) Automatic focus controller

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A711

Effective date: 20050606

A72 Notification of change in name of applicant

Free format text: JAPANESE INTERMEDIATE CODE: A721

Effective date: 20050606

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A711

Effective date: 20051006