GB1402407A - Apparatus for examining a record with a light beam - Google Patents

Apparatus for examining a record with a light beam

Info

Publication number
GB1402407A
GB1402407A GB5570573A GB5570573A GB1402407A GB 1402407 A GB1402407 A GB 1402407A GB 5570573 A GB5570573 A GB 5570573A GB 5570573 A GB5570573 A GB 5570573A GB 1402407 A GB1402407 A GB 1402407A
Authority
GB
United Kingdom
Prior art keywords
deflection system
mirrors
light beam
recorded information
mirror
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
GB5570573A
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.)
Street G S B
Original Assignee
Street G S B
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
Priority claimed from US310679A external-priority patent/US3896362A/en
Application filed by Street G S B filed Critical Street G S B
Publication of GB1402407A publication Critical patent/GB1402407A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/02—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes by tracing or scanning a light beam on a screen
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • G05D3/20—Control of position or direction using feedback using a digital comparing device

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

1402407 Photo-electric scanning G S B STREET 30 Nov 1973 [30 Nov 1972] 55705/73 Addition to 1324241 Heading G1A [Also in Division G3] Apparatus for scanning recorded information with a light beam comprises steering mirrors; mirror positioning means responsive to digital error signals derived from applied command and position feedback signals; a secondary fine-control deflection system having faster response than the steering mirrors; means for applying said error signals to the secondary deflection system; and means for detecting the light beam after its interaction with the recorded information. A narrow laser beam 10 after passing through a secondary deflection system 11 is focused by a lens 13 and directed by a main deflection system 14 to a surface 15 carrying recorded information whence, after reflection or transmission, it is detected by a known device (not shown). The X and Y components of the main deflection system 14 comprise respective mirrors 16, Fig. 2 each mounted on crossed springs 17 and provided with driving coils 18 coupled to a magnetic field. Mirrors 19-23 constituting a Michelson interferometer reflect a light beam 24 (which could be derived from the laser 10) to generate interference fringes whose shift in response to the mirror displacement 16, is sensed by the photo-cells 25, 26 to supply signals in mutual quadrature to a fringe counter 27. A mirror control circuit 28 detailed in Fig. 3, comparing the fringe counter output with a digital command vector signal 29, supplies an analogue deviation signal with velocity-dependent damping to the driving coils 18. A secondary deflection system 11, e.g. an electro-optical device as described in Specification 1012430 or a pair of small suspended mirrors as described in Specification 1394570 makes rapid fine adjustments to the beam when driven by a secondary control system 28.
GB5570573A 1972-11-30 1973-11-30 Apparatus for examining a record with a light beam Expired GB1402407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US310679A US3896362A (en) 1970-10-21 1972-11-30 Light-beam steering apparatus

Publications (1)

Publication Number Publication Date
GB1402407A true GB1402407A (en) 1975-08-06

Family

ID=23203632

Family Applications (2)

Application Number Title Priority Date Filing Date
GB5570473A Expired GB1418119A (en) 1972-11-30 1973-11-30 Apparatus for recording with a light beam
GB5570573A Expired GB1402407A (en) 1972-11-30 1973-11-30 Apparatus for examining a record with a light beam

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB5570473A Expired GB1418119A (en) 1972-11-30 1973-11-30 Apparatus for recording with a light beam

Country Status (1)

Country Link
GB (2) GB1418119A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3119505A1 (en) * 1981-05-15 1983-01-27 Siemens AG, 1000 Berlin und 8000 München Optical sensor for measuring three-dimensional objects

Also Published As

Publication number Publication date
GB1418119A (en) 1975-12-17

Similar Documents

Publication Publication Date Title
US3715165A (en) Investigating the topography of reflecting surfaces
US4051329A (en) An optical information recording system in which the energy when transmitted to the recording layer is constant
GB1488691A (en) Opto-electronic positioning-system
US4809247A (en) Video disc head tracking apparatus
US4213704A (en) Method and apparatus for sensing the position of a writing laser beam
US4464030A (en) Dynamic accuracy X-Y positioning table for use in a high precision light-spot writing system
GB1468253A (en) Apparatus for optically recording and/or reproducing information signals
GB1420665A (en) Method and apparatus for transducer temperature compensation
JPS6322258B2 (en)
US4703467A (en) Video disc read back scanner
US4123166A (en) Optical detector of remote movement including cyclic scanning of target
GB1147521A (en) Lens centring apparatus
US3896362A (en) Light-beam steering apparatus
US5115420A (en) Utilizing wasted laser light in optical systems
GB1185953A (en) Interferometer
GB1402407A (en) Apparatus for examining a record with a light beam
US3945037A (en) Feedback control system for linear position transducer
JPH10332354A (en) Interference measuring device
GB1392395A (en) Stabilization of optical path length differences
GB1161917A (en) Photoelectric Microscopes.
GB1396712A (en) Image testing device
GB1286809A (en) Servomechanism for control of a scanning device
US3441735A (en) Boundary follower using oscillating photocells
GB1471386A (en) Interferometer for testing telescope optics
GB1085523A (en) Construction and control of ruling engines

Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
732 Registration of transactions, instruments or events in the register (sect. 32/1977)