JPS56133704A - Focus error detector - Google Patents

Focus error detector

Info

Publication number
JPS56133704A
JPS56133704A JP3710180A JP3710180A JPS56133704A JP S56133704 A JPS56133704 A JP S56133704A JP 3710180 A JP3710180 A JP 3710180A JP 3710180 A JP3710180 A JP 3710180A JP S56133704 A JPS56133704 A JP S56133704A
Authority
JP
Japan
Prior art keywords
light
slit
mirror
target face
reflected
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
JP3710180A
Other languages
Japanese (ja)
Inventor
Tsuneo Hirose
Shinichi Tanaka
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3710180A priority Critical patent/JPS56133704A/en
Publication of JPS56133704A publication Critical patent/JPS56133704A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To considerably expand the detection range of focus errors by providing a wave front converting means such as slit in the optical path of reflected light from a light focusing target face. CONSTITUTION:The parallel beams from a light source are reflected by a mirror 12 and are projected to a light focusing target face 7 via an objective lens 3. The reflected light passes again through the lens 3 and is made into parallel beams which arrive at the mirror 12. Since a slit 12 which is a wave front converting means is provided to the mirror 12 in a position off from the optical axis, part of the reflected light passes the slit 13 and is applied via focusing lens 5 to a bisected light detector 14. A focus error is detected by the difference in the quantities of light received in the right and left photodetectors forming the detector 14. Since the device is formed in this way, an unbalance in the quantities of the light received in the right and left photodetectors occurs even when the target face 7 is in a position extremely deviated from the focal position, whereby the detection range is expanded.
JP3710180A 1980-03-24 1980-03-24 Focus error detector Pending JPS56133704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3710180A JPS56133704A (en) 1980-03-24 1980-03-24 Focus error detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3710180A JPS56133704A (en) 1980-03-24 1980-03-24 Focus error detector

Publications (1)

Publication Number Publication Date
JPS56133704A true JPS56133704A (en) 1981-10-20

Family

ID=12488184

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3710180A Pending JPS56133704A (en) 1980-03-24 1980-03-24 Focus error detector

Country Status (1)

Country Link
JP (1) JPS56133704A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517666A (en) * 1981-06-22 1985-05-14 Tokyo Shibaura Denki Kabushiki Kaisha Optical head
JPS60146920U (en) * 1984-03-12 1985-09-30 フオスタ−電機株式会社 Optical information reproducing device
US4546460A (en) * 1981-10-22 1985-10-08 Tokyo Shibaura Denki Kabushiki Kaisha Videodisc autofocus device
US4654516A (en) * 1983-06-30 1987-03-31 Kabushiki Kaisha Toshiba Optical head

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517666A (en) * 1981-06-22 1985-05-14 Tokyo Shibaura Denki Kabushiki Kaisha Optical head
US4546460A (en) * 1981-10-22 1985-10-08 Tokyo Shibaura Denki Kabushiki Kaisha Videodisc autofocus device
US4654516A (en) * 1983-06-30 1987-03-31 Kabushiki Kaisha Toshiba Optical head
JPS60146920U (en) * 1984-03-12 1985-09-30 フオスタ−電機株式会社 Optical information reproducing device

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