GB1508811A - Electrically controlled optical deflection system - Google Patents

Electrically controlled optical deflection system

Info

Publication number
GB1508811A
GB1508811A GB2934575A GB2934575A GB1508811A GB 1508811 A GB1508811 A GB 1508811A GB 2934575 A GB2934575 A GB 2934575A GB 2934575 A GB2934575 A GB 2934575A GB 1508811 A GB1508811 A GB 1508811A
Authority
GB
United Kingdom
Prior art keywords
duct
filament
coil
july
sectional area
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.)
Expired
Application number
GB2934575A
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.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Publication of GB1508811A publication Critical patent/GB1508811A/en
Expired 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Automatic Focus Adjustment (AREA)
  • Lens Barrels (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

1508811 Reciprocating motors THOMSONBRANDT 11 July 1975 [12 July 1974] 29345/75 Heading H2A In a light deflector for use within a servoloop and comprising a mirror 2 and a coil 5 mounted on the moving part 3 of a moving coil galvanometer movement, an elastic filament 9 of relatively large cross-sectional area is stretched so as to permit its insertion in a duct 4 of relatively small cross-sectional area in the part 3 and thereafter allow to release so that it resiliently engages the duct wall, the ends of the filament likewise being engaged in fixed supports 22, 23 so that the part 3 is mounted for rotation about the duct axis XX with the coil 5 lying in the magnetic field provided by fixed polepieces 11, 12 and 16, 17. Such a structure may have a low moment of inertia and a low fundamental resonant frequency with negligible higher resonances. The filament 9 may be of an elastomer or rubber, and together with duct 4 may have a circular or square cross-section. The part 3 is of non-magnetic material and may be a hollow cylindrical or parallelepipedal vessel with the duct extending longitudinally thereof the centre of the base. The deflector may be used when optically reading video discs.
GB2934575A 1974-07-12 1975-07-11 Electrically controlled optical deflection system Expired GB1508811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7424368A FR2278112A1 (en) 1974-07-12 1974-07-12 ELECTRICALLY CONTROLLED OPTICAL DEFLECTION SYSTEM

Publications (1)

Publication Number Publication Date
GB1508811A true GB1508811A (en) 1978-04-26

Family

ID=9141228

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2934575A Expired GB1508811A (en) 1974-07-12 1975-07-11 Electrically controlled optical deflection system

Country Status (5)

Country Link
JP (1) JPS5132339A (en)
DE (1) DE2531069C3 (en)
FR (1) FR2278112A1 (en)
GB (1) GB1508811A (en)
IT (1) IT1039784B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169455A (en) * 1985-01-07 1986-07-09 Priam Corp Magnetic disc drive and voice coil motor therefor

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL174608C (en) * 1975-10-20 1984-07-02 Philips Nv METHOD FOR THE MANUFACTURE OF A TILT MIRROR DEVICE AND A TILT MIRROR DEVICE MADE ACCORDING TO THIS METHOD
JPS5593544A (en) * 1979-01-09 1980-07-16 Sony Corp Multi-axis movable mirror unit
JPS55137117U (en) * 1979-03-19 1980-09-30
JPS5686639U (en) * 1979-12-04 1981-07-11
JPS56149343U (en) * 1980-04-09 1981-11-10
FR2493018A1 (en) * 1980-07-22 1982-04-30 Thomson Csf OPTICAL DEFLECTOR WITH ELECTRICAL CONTROL
US4592037A (en) * 1980-11-28 1986-05-27 Hitachi, Ltd. Device for displacing a pickup head in multi-axial directions
DE4229507C2 (en) * 1991-10-30 2002-03-07 Cms Mikrosysteme Gmbh Micromechanical 3-D actuator
US7420449B2 (en) 2006-08-18 2008-09-02 Oc Oerlikon Balzers Ag Mirror actuating device for projection systems
DE102006038787A1 (en) * 2006-08-18 2008-02-21 Oc Oerlikon Balzers Ag Mirror drive for projection systems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3532408A (en) * 1968-05-20 1970-10-06 Bulova Watch Co Inc Resonant torsional oscillators
US3614233A (en) * 1970-05-08 1971-10-19 Saab Ab Device for linear displacement of a plane optical image in its own plane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169455A (en) * 1985-01-07 1986-07-09 Priam Corp Magnetic disc drive and voice coil motor therefor

Also Published As

Publication number Publication date
FR2278112A1 (en) 1976-02-06
DE2531069B2 (en) 1979-09-27
JPS5710404B2 (en) 1982-02-26
FR2278112B1 (en) 1978-01-27
DE2531069A1 (en) 1976-01-29
IT1039784B (en) 1979-12-10
JPS5132339A (en) 1976-03-18
DE2531069C3 (en) 1980-06-19

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee