JPS5552540A - Reproducing device for recording medium - Google Patents

Reproducing device for recording medium

Info

Publication number
JPS5552540A
JPS5552540A JP12334878A JP12334878A JPS5552540A JP S5552540 A JPS5552540 A JP S5552540A JP 12334878 A JP12334878 A JP 12334878A JP 12334878 A JP12334878 A JP 12334878A JP S5552540 A JPS5552540 A JP S5552540A
Authority
JP
Japan
Prior art keywords
electrode
reproducing
chargeable
recording medium
region
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
JP12334878A
Other languages
Japanese (ja)
Inventor
Koki Sato
Hirotaka Takada
Sakae 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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP12334878A priority Critical patent/JPS5552540A/en
Publication of JPS5552540A publication Critical patent/JPS5552540A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To obtain a semipermanent reproducing device which is high in recording density and in reproduction output by forming a chargeable region of a pattern, corresponding to a recording signal, on a recording medium on a substrate, and then by reproducing the recording signal by using a reproducing electrode after charging that area.
CONSTITUTION: On the surface of base 3 of discoid recording medium 1, for example, grooves where chargeable regions 2 are buried by a laser beam, etc., are so formed that the width or depth will very with the level of a recording signal. On surfaces of grooves and base 3, conductive layer 4 is formed of Al, etc., and a high- resistance chargeable material is buried which becomes chargeable region 2 and is made of vinylidene chloride, etc. Then, region 2 is charged to hundreds volt, for example, and reproducing electrode 5 traces it to obtain a reproduction output of several to tens volt. Electrode 5 is connected to the gate of field effect transistor Q and its output is led out. Here, B represents a direct-current source. Electrode 5 and medium 2 are used without contact, so that the both can be prevented from wearing.
COPYRIGHT: (C)1980,JPO&Japio
JP12334878A 1978-10-06 1978-10-06 Reproducing device for recording medium Pending JPS5552540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12334878A JPS5552540A (en) 1978-10-06 1978-10-06 Reproducing device for recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12334878A JPS5552540A (en) 1978-10-06 1978-10-06 Reproducing device for recording medium

Publications (1)

Publication Number Publication Date
JPS5552540A true JPS5552540A (en) 1980-04-17

Family

ID=14858333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12334878A Pending JPS5552540A (en) 1978-10-06 1978-10-06 Reproducing device for recording medium

Country Status (1)

Country Link
JP (1) JPS5552540A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560757A1 (en) * 1989-06-23 1993-09-22 Univ Leland Stanford Junior Method and apparatus for storing digital information in the form of stored charges.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4923012A (en) * 1972-06-28 1974-03-01
JPS4961326A (en) * 1972-10-12 1974-06-14

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4923012A (en) * 1972-06-28 1974-03-01
JPS4961326A (en) * 1972-10-12 1974-06-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560757A1 (en) * 1989-06-23 1993-09-22 Univ Leland Stanford Junior Method and apparatus for storing digital information in the form of stored charges.

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