JPS56114136A - Optical recording and reproducing device - Google Patents

Optical recording and reproducing device

Info

Publication number
JPS56114136A
JPS56114136A JP1811280A JP1811280A JPS56114136A JP S56114136 A JPS56114136 A JP S56114136A JP 1811280 A JP1811280 A JP 1811280A JP 1811280 A JP1811280 A JP 1811280A JP S56114136 A JPS56114136 A JP S56114136A
Authority
JP
Japan
Prior art keywords
light
diameter
shielding plate
movable mirror
interposed
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
JP1811280A
Other languages
Japanese (ja)
Other versions
JPS6259371B2 (en
Inventor
Toru Nakamura
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 JP1811280A priority Critical patent/JPS56114136A/en
Publication of JPS56114136A publication Critical patent/JPS56114136A/en
Publication of JPS6259371B2 publication Critical patent/JPS6259371B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops

Landscapes

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

Abstract

PURPOSE:To stabilize the operation of the tracking sero system, by providing the light shielding plate with a hole for the purpose of reducing the diameter of the light flux from the light source at a reproducing time. CONSTITUTION:Light shielding plate 8 with hole 7 formed is provided removably between light source 1 and half mirror 2. At the recording time, light shielding plate 8 is not interposed in the light path; and at the reproducing time, light shelding plate 8 is interposed to reduce the diameter of the light flux, and therefore, the diameter of the light flux to condenser lens 4 becomes small. Consequently, even if movable mirror 3 is rotated finely, a part of the reflection light due to movable mirror 3 is prevented from being not incident to condenser lens, and the light quantity and light quantity balance to photodetector 6 become constant independently of rotation of movable mirror 3, and thus, the stable servo operation is performed.
JP1811280A 1980-02-15 1980-02-15 Optical recording and reproducing device Granted JPS56114136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1811280A JPS56114136A (en) 1980-02-15 1980-02-15 Optical recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1811280A JPS56114136A (en) 1980-02-15 1980-02-15 Optical recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS56114136A true JPS56114136A (en) 1981-09-08
JPS6259371B2 JPS6259371B2 (en) 1987-12-10

Family

ID=11962522

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1811280A Granted JPS56114136A (en) 1980-02-15 1980-02-15 Optical recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS56114136A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01211333A (en) * 1988-02-19 1989-08-24 Matsushita Electric Ind Co Ltd Optical pickup
US5486944A (en) * 1989-10-30 1996-01-23 Symbol Technologies, Inc. Scanner module for symbol scanning system
JPH08315410A (en) * 1995-05-19 1996-11-29 Nec Corp Optical recorded information reproducing device
JPH08329516A (en) * 1995-06-05 1996-12-13 Nec Corp Optical head device
FR2743660A1 (en) * 1996-01-11 1997-07-18 Samsung Electronics Co Ltd OPTICAL READING HEAD

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0238572U (en) * 1988-09-06 1990-03-14

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01211333A (en) * 1988-02-19 1989-08-24 Matsushita Electric Ind Co Ltd Optical pickup
US5486944A (en) * 1989-10-30 1996-01-23 Symbol Technologies, Inc. Scanner module for symbol scanning system
JPH08315410A (en) * 1995-05-19 1996-11-29 Nec Corp Optical recorded information reproducing device
JPH08329516A (en) * 1995-06-05 1996-12-13 Nec Corp Optical head device
FR2743660A1 (en) * 1996-01-11 1997-07-18 Samsung Electronics Co Ltd OPTICAL READING HEAD
NL1004964C2 (en) * 1996-01-11 1998-02-05 Samsung Electronics Co Ltd Optical pick-up device.
US5986993A (en) * 1996-01-11 1999-11-16 Samsung Electronics Co., Ltd. Optical pickup device having a diaphram with a predetermined aperture

Also Published As

Publication number Publication date
JPS6259371B2 (en) 1987-12-10

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