JPS5555442A - Optical reproducing device - Google Patents

Optical reproducing device

Info

Publication number
JPS5555442A
JPS5555442A JP12896778A JP12896778A JPS5555442A JP S5555442 A JPS5555442 A JP S5555442A JP 12896778 A JP12896778 A JP 12896778A JP 12896778 A JP12896778 A JP 12896778A JP S5555442 A JPS5555442 A JP S5555442A
Authority
JP
Japan
Prior art keywords
concaves
convexes
sound groove
wall
angle
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.)
Granted
Application number
JP12896778A
Other languages
Japanese (ja)
Other versions
JPS5834008B2 (en
Inventor
Shinichi Tanaka
Kazuji Kobayashi
Ikuo Matsuda
Tsuneo Hirose
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 JP53128967A priority Critical patent/JPS5834008B2/en
Publication of JPS5555442A publication Critical patent/JPS5555442A/en
Publication of JPS5834008B2 publication Critical patent/JPS5834008B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE: To make optical reproducing signals low-noise by irradiating a sound groove wall, where signals are recorded in a form of concaves and convexes, at different incident angles to detect only the reflection light of a specific direction.
CONSTITUTION: When lattice constants of two sets of diffraction lattices which are parallel and have lattice constants variable and equal to each other are changed in proportion to circular speed V of sound groove wall 19 where signals are recorded in a form of concaves and convexes, wall 19 is irradiated alternately by incident lights 22a and 22b different in angle. Only one of reflection lights 23a and 23b is detected by position detector 21 such as an image sensor according to concaves and convexes of wall 19. When a signal corresponding to angle ϕ proportional to angle ϕ according to the depth of concaves and convexes is generated according to the light receiving position, optical reproducing signals of a low noise can be formed by the fixed reflection light quantity from the sound groove wall dependent upon a fixed irradiation light quantity independently of size of concaves and convexes of the sound groove.
COPYRIGHT: (C)1980,JPO&Japio
JP53128967A 1978-10-18 1978-10-18 optical reproduction device Expired JPS5834008B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53128967A JPS5834008B2 (en) 1978-10-18 1978-10-18 optical reproduction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53128967A JPS5834008B2 (en) 1978-10-18 1978-10-18 optical reproduction device

Publications (2)

Publication Number Publication Date
JPS5555442A true JPS5555442A (en) 1980-04-23
JPS5834008B2 JPS5834008B2 (en) 1983-07-23

Family

ID=14997832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53128967A Expired JPS5834008B2 (en) 1978-10-18 1978-10-18 optical reproduction device

Country Status (1)

Country Link
JP (1) JPS5834008B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60179606A (en) * 1984-07-27 1985-09-13 Nakanishi Kinzoku Kogyo Kk Length measuring device

Also Published As

Publication number Publication date
JPS5834008B2 (en) 1983-07-23

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