JPS5538663A - Detector for recording medium of optical information reader - Google Patents

Detector for recording medium of optical information reader

Info

Publication number
JPS5538663A
JPS5538663A JP11108778A JP11108778A JPS5538663A JP S5538663 A JPS5538663 A JP S5538663A JP 11108778 A JP11108778 A JP 11108778A JP 11108778 A JP11108778 A JP 11108778A JP S5538663 A JPS5538663 A JP S5538663A
Authority
JP
Japan
Prior art keywords
video disc
detector
irradiation
light flux
disc
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
JP11108778A
Other languages
Japanese (ja)
Inventor
Takashi Okano
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 JP11108778A priority Critical patent/JPS5538663A/en
Publication of JPS5538663A publication Critical patent/JPS5538663A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/10—Control of operating function, e.g. switching from recording to reproducing by sensing presence or absence of record in accessible stored position or on turntable

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To make a decision on whether there is a video disc installed or not by detecting reflected light flux of large diameter from the video disc. CONSTITUTION:When focus lens 7 servo-controlled to focus irradiation laser light flux on video disc 8 is set at an initial position, disc 8 is irradiated with light flux of large diameter. The light flux of large diameter reflected by disc 8 through this irradiation passed through the opposite light passage to the irradiation light passage and is detected by photo detector 14. In this constitution, a decision on whether the video disc is set or not is made depending upon the generation of a detection signal generated when detector 14 detects the light after the irradiation starts. The output signal of this element is used to prevent the video disc and focus lens from coming in contact.
JP11108778A 1978-09-09 1978-09-09 Detector for recording medium of optical information reader Pending JPS5538663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11108778A JPS5538663A (en) 1978-09-09 1978-09-09 Detector for recording medium of optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11108778A JPS5538663A (en) 1978-09-09 1978-09-09 Detector for recording medium of optical information reader

Publications (1)

Publication Number Publication Date
JPS5538663A true JPS5538663A (en) 1980-03-18

Family

ID=14552045

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11108778A Pending JPS5538663A (en) 1978-09-09 1978-09-09 Detector for recording medium of optical information reader

Country Status (1)

Country Link
JP (1) JPS5538663A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983004329A1 (en) * 1982-06-04 1983-12-08 Sony Corporation Optical disc reproducer
US4497049A (en) * 1982-02-25 1985-01-29 Staar S. A. System for detecting the operative face of a disc carrying data on one face only
US4499571A (en) * 1981-05-01 1985-02-12 Tokyo Shibaura Denki Kabushiki Optical disk system with laser safety arrangement
US4680744A (en) * 1984-01-30 1987-07-14 Pioneer Electronic Corporation Disc player having pick-up tilt servo system combined with disc presence detection circuits
US5119356A (en) * 1987-08-11 1992-06-02 Canon Kabushiki Kaisha Information recording and reproducing apparatus including detection of whether an information recording medium has been normally loaded into the apparatus
WO2006106444A3 (en) * 2005-04-04 2007-03-01 Koninkl Philips Electronics Nv A method for preventing interchange of optical information carriers

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499571A (en) * 1981-05-01 1985-02-12 Tokyo Shibaura Denki Kabushiki Optical disk system with laser safety arrangement
US4497049A (en) * 1982-02-25 1985-01-29 Staar S. A. System for detecting the operative face of a disc carrying data on one face only
WO1983004329A1 (en) * 1982-06-04 1983-12-08 Sony Corporation Optical disc reproducer
US4723234A (en) * 1982-06-04 1988-02-02 Sony Corporation Optical disc player
US4680744A (en) * 1984-01-30 1987-07-14 Pioneer Electronic Corporation Disc player having pick-up tilt servo system combined with disc presence detection circuits
US5119356A (en) * 1987-08-11 1992-06-02 Canon Kabushiki Kaisha Information recording and reproducing apparatus including detection of whether an information recording medium has been normally loaded into the apparatus
WO2006106444A3 (en) * 2005-04-04 2007-03-01 Koninkl Philips Electronics Nv A method for preventing interchange of optical information carriers
US8144560B2 (en) 2005-04-04 2012-03-27 Koninklijke Philips Electronics N.V. Method for preventing interchange of optical information carriers

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