JPS57200001A - Optical record information reader - Google Patents

Optical record information reader

Info

Publication number
JPS57200001A
JPS57200001A JP56083875A JP8387581A JPS57200001A JP S57200001 A JPS57200001 A JP S57200001A JP 56083875 A JP56083875 A JP 56083875A JP 8387581 A JP8387581 A JP 8387581A JP S57200001 A JPS57200001 A JP S57200001A
Authority
JP
Japan
Prior art keywords
light
reflected
condensed
incident
luminous flux
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
JP56083875A
Other languages
Japanese (ja)
Inventor
Teru Yamada
Hiroyasu Mimura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56083875A priority Critical patent/JPS57200001A/en
Publication of JPS57200001A publication Critical patent/JPS57200001A/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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining

Abstract

PURPOSE:To realize a small-sized, lightweight optical information recorder and reader with high performance by using a parabolic mirror for condensing, and thus realizing a large numerical aperture, facilitated elimination of spherical aberration, and the increased degree of freedom of a material. CONSTITUTION:Luminous flux 20 radiated from a light source (e.g. semiconductor laser) 10 is reflected and condensed by an aspherical mirror 60 to form a fine spot on a prescribed surface of an information record carrier. The reflected light containing information travels backward on the forward path as circularly polarized light or elliptically polarized light in the opposite rotational direction to the incident light, and is transmitted in a 2/4 plate 50 through the aspherical mirror 60; and the reflected light having an about phase difference (x) from the incident light is reflected by a polarizing beam splitter 40 nearly at right angles to the incident optical axis, and the luminous flux passed through the astigmatism system of a convex lens 80 and a cylindrical lens 90 is condensed on a photodetector 100, thereby converting an optical information signal from an information record carrier into an electric signal.
JP56083875A 1981-06-02 1981-06-02 Optical record information reader Pending JPS57200001A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083875A JPS57200001A (en) 1981-06-02 1981-06-02 Optical record information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083875A JPS57200001A (en) 1981-06-02 1981-06-02 Optical record information reader

Publications (1)

Publication Number Publication Date
JPS57200001A true JPS57200001A (en) 1982-12-08

Family

ID=13814824

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083875A Pending JPS57200001A (en) 1981-06-02 1981-06-02 Optical record information reader

Country Status (1)

Country Link
JP (1) JPS57200001A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60192125U (en) * 1984-05-30 1985-12-20 アルプス電気株式会社 optical pick up
JPS61214139A (en) * 1985-03-19 1986-09-24 Olympus Optical Co Ltd Head device of optical recording and reproducing device
JPH01251440A (en) * 1988-03-31 1989-10-06 Toshiba Corp Laser beam arranging device
JPH01174721U (en) * 1988-05-30 1989-12-12
JPH0261831A (en) * 1988-08-26 1990-03-01 Mitsumi Electric Co Ltd Optical head
EP0944049A3 (en) * 1998-03-19 2000-03-08 Fuji Xerox Co., Ltd. Optical head, disk apparatus, method for manufacturing optical head and optical element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60192125U (en) * 1984-05-30 1985-12-20 アルプス電気株式会社 optical pick up
JPS61214139A (en) * 1985-03-19 1986-09-24 Olympus Optical Co Ltd Head device of optical recording and reproducing device
JPH01251440A (en) * 1988-03-31 1989-10-06 Toshiba Corp Laser beam arranging device
JPH01174721U (en) * 1988-05-30 1989-12-12
JPH0261831A (en) * 1988-08-26 1990-03-01 Mitsumi Electric Co Ltd Optical head
EP0944049A3 (en) * 1998-03-19 2000-03-08 Fuji Xerox Co., Ltd. Optical head, disk apparatus, method for manufacturing optical head and optical element

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