JPS5515546A - Opitical information reader - Google Patents

Opitical information reader

Info

Publication number
JPS5515546A
JPS5515546A JP8787478A JP8787478A JPS5515546A JP S5515546 A JPS5515546 A JP S5515546A JP 8787478 A JP8787478 A JP 8787478A JP 8787478 A JP8787478 A JP 8787478A JP S5515546 A JPS5515546 A JP S5515546A
Authority
JP
Japan
Prior art keywords
light
recording medium
light axis
reflected light
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
JP8787478A
Other languages
Japanese (ja)
Inventor
Ikuyuki Miyazawa
Noriaki Tsukada
Kazuo Okada
Hirobumi Namisaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8787478A priority Critical patent/JPS5515546A/en
Publication of JPS5515546A publication Critical patent/JPS5515546A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain easily a read signal with a small noise by displacing the light axis of a reflected light by arranging a double image prism and 1/4-wavelength plate on the light axis and then by converting the light into an electric signal direct by a photo detector.
CONSTITUTION: One optical unit serves as two optical systems; one system focuses a laser beam emitted from semiconductor laser 1 on the small light spot and then lead it to information recording medium 5, and the other focuses a reflected beam from recording medium 5 and leads it to photo detector 6. On the light axis of the optical system, double image prism 9 is provided and 1/4-wavelength plate 8 is arranged at the recording medium 5 to deviate the light axis of the reflected light from the light axis of the laser beam, thereby converting the reflected light into an electric signal by detector 6. The reflected light is converted direct to recording information signal not making use of self-coupling effect of the semi-conductor laser, so that a read signal with a small noise can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP8787478A 1978-07-18 1978-07-18 Opitical information reader Pending JPS5515546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8787478A JPS5515546A (en) 1978-07-18 1978-07-18 Opitical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8787478A JPS5515546A (en) 1978-07-18 1978-07-18 Opitical information reader

Publications (1)

Publication Number Publication Date
JPS5515546A true JPS5515546A (en) 1980-02-02

Family

ID=13927006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8787478A Pending JPS5515546A (en) 1978-07-18 1978-07-18 Opitical information reader

Country Status (1)

Country Link
JP (1) JPS5515546A (en)

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