EP0148229A1 - Unite de balayage d'image amelioree - Google Patents

Unite de balayage d'image amelioree

Info

Publication number
EP0148229A1
EP0148229A1 EP84902573A EP84902573A EP0148229A1 EP 0148229 A1 EP0148229 A1 EP 0148229A1 EP 84902573 A EP84902573 A EP 84902573A EP 84902573 A EP84902573 A EP 84902573A EP 0148229 A1 EP0148229 A1 EP 0148229A1
Authority
EP
European Patent Office
Prior art keywords
mirror
collecting
optical axis
image
correcting
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.)
Withdrawn
Application number
EP84902573A
Other languages
German (de)
English (en)
Other versions
EP0148229A4 (fr
Inventor
Gavin William Mcquistan
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.)
Commonwealth of Australia
Original Assignee
Commonwealth of Australia
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 Commonwealth of Australia filed Critical Commonwealth of Australia
Publication of EP0148229A1 publication Critical patent/EP0148229A1/fr
Publication of EP0148229A4 publication Critical patent/EP0148229A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0031—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for scanning purposes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems

Definitions

  • the present invention relates to a scanning unit of the general type used for instance in infrared scanners in which a nodding mirror directs the incoming 5. rays onto a mirror which in turn directs the rays onto a spherical mirror from which the rays are directed to correcting devices such as mirrors or lenses which rotate about an axis and which in turn direct the rays after correction to a detector,
  • roof reflectors which, as part of their functions, is to provide a nodding movement perpendicular to the scan.
  • the object of the present invention is to provide a simplified and compact form of these earlier devices.
  • a further object is to achieve an arrangement in which the aberrations which are to be corrected 5. are uniform across the field and can be removed by the rotating elements.
  • a further object is to allow a straight line scan in object space in association with a nodding mirror.
  • the invention relates to an improved scanning device which collects an image through a mirror nodding in a first plane and directs it to a focussing collecting mirror scanned in turn by a rotating scanner unit having pairs of optical elements moving in a second
  • the focusing collecting mirror aberrations being uniform across the field and corrected symmetrically by the rotating optical correcting mirrors.
  • present invention uses a nodding mirror to direct the rays onto a spherical receiving mirror 30. which is a half mirror to allow efficient use of
  • OMPI the mirror area provided and to allow the correcting mirrors of the rotating scanning system to be advantage ⁇ ously positioned in relation to the half spherical collecting mirr ⁇ r to give a compact assembly which 5. allows on-axis scanning of a straight line in object space.
  • the invention comprises a half spherical collecting mirror associated with a nodding mirror positioned adjacent the collecting
  • mirror and to one side of the optical axis of the half spherical collecting mirror characterised by a fixed receiving mirror on the optical axis of the half spherical collecting mirror positioned on the same side of the half spherical collecting mirror as the
  • nodding mirror and parallel to the planar edge of the collecting mirror a detector positioned to receive the image projected by the half spherical collecting mirror to the fixed mirror, and a series of aspheric correcting mirrors mounted on a scanner arranged to rotate about an
  • the aspheric correcting mirrors are pairs of half spherical mirrors with one mirror of each pair on one side of the optical axis of the half spherical collecting mirror and the other mirror on the opposite 30. side of the optical axis with the planar edges adjacent the optical axis and parallel to the planar edge of the half spherical collecting mirror.
  • the fixed mirror is disposed within the circle of rotation of the aspheric correcting mirrors so that the correcting mirrors traverse between the half circular collecting mirror and the fixed mirror to scan the half 5. circular collecting mirror.
  • FIG. 1 is a somewhat schematic longitudinal sectional elevation of a unit constructed according to this invention.
  • FIG. 2 shows the basic components of the system 15. indicating the position of the optical axis of the half spherical collecting mirror and the rotational axis of the scanner carrying the pairs of correcting mirrors.
  • the nodding mirror 1 is supported in any convenient 20. manner in a housing 2 and is provided with a cam
  • a fixed mirror 10 directs the rays to the detector 11 which may be of any usual or approved form and may be connected to a visual display or to a mini- processor or the like for image storage or analysing 5. purposes.
  • the illustrations shows the compact nature of the device which is arranged in a fold-back pattern with the nodding mirror 1, the half spherical mirror 5, and the detector 11 being arranged in close proximity 10. in a generally stacked formation, allowing the aspheri- cal compensating mirrors 6 and 7 of the scanner 8 to be readily positioned about the optical axis 14.
  • a driving motor 16 rotates the scanner 8 which carries the set of aspheric correcting mirrors 6 and 7.
  • the axis 4 about which the nodding mirror 1 moves is parallel to the planar edge 15 of the collect ⁇ ing mirror 5 and the axis 9 about which the scanner unit 8 rotates is normal to the plane of the planar edge 15 of the collecting mirror 5 as well as normal to the optical axis of the half spherical collecting mirror 5.
  • a relatively horizontal field of view is directed by the nodding mirror 1 to the 15. half-circular collector mirror 5, but the field of view is progressively scanned vertically as the mirror 1 nods.
  • the image is then directed by the half spherical collecting mirror 5 generally along the optical axis of 20. the collecting mirror 5 and is directed by the mirror 6 of each set of correcting mirrors to the associated correcting mirror 7 which projects the image to the fixed mirror 10 and thence to the detector 11.
  • the scanner rotate about the axis of rotation 9 of the scanner 8 a transverse scan of the image projected from the collecting mirror 5 occurs and, as the aspheric correcting mirrors 6 and 7 are arranged about the
  • OMPI optical axis of the collecting mirror 5 enables the collecting mirror aberrations to be uniform across the field and corrected symetrically by the rotating aspheric correcting mirrors.
  • an electronics bay is desig ⁇ nated 21 and an output to a display is designated 22.
  • An encoder is designated 23 and a window of the housing 1 is designated 24.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Lenses (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

Un dispositif de balayage amélioré est adapté pour diriger une image au travers d'un miroir incliné (1) vers un miroir collecteur (5) balayé à son tour par un dispositif de balayage rotatif (8) dans lequel le miroir collecteur est un miroir hémisphérique (5) et les éléments de correction sont des miroirs (6, 7) portés sur un dispositif de balayage (8) ayant son axe de rotation (9) normal par rapport à l'axe optique (14) du miroir collecteur (5) et l'intersectant de sorte à diriger l'image le long de l'axe optique (14) du miroir collecteur (5) sur un miroir fixe (10) et, de là, vers un détecteur (11).
EP19840902573 1983-06-30 1984-06-27 Unite de balayage d'image amelioree. Withdrawn EP0148229A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU54/83 1983-06-30
AUPG005483 1983-06-30

Publications (2)

Publication Number Publication Date
EP0148229A1 true EP0148229A1 (fr) 1985-07-17
EP0148229A4 EP0148229A4 (fr) 1985-11-07

Family

ID=3770211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840902573 Withdrawn EP0148229A4 (fr) 1983-06-30 1984-06-27 Unite de balayage d'image amelioree.

Country Status (3)

Country Link
EP (1) EP0148229A4 (fr)
JP (1) JPS61501592A (fr)
WO (1) WO1985000435A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805749A1 (de) * 1968-10-29 1970-05-21 Licentia Gmbh Infrarot-Bildempfaenger fuer die Flugaufklaerung
US3790247A (en) * 1972-06-09 1974-02-05 Bendix Corp All reflective image space scanning device
GB2023369A (en) * 1978-06-16 1979-12-28 Philips Nv Device for two-dimensional infra-red scanning

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631248A (en) * 1969-12-30 1971-12-28 Texas Instruments Inc Target-scanning camera comprising a constant temperature source for providing a calibration signal
NL7103141A (fr) * 1970-03-11 1971-09-14
US3817593A (en) * 1971-11-11 1974-06-18 Te Co Image surface scanning system
US4326799A (en) * 1975-08-06 1982-04-27 Raytheon Company Active-passive scanning system
GB1567320A (en) * 1977-01-07 1980-05-14 Rank Organisation Ltd Scanners
US4279472A (en) * 1977-12-05 1981-07-21 Street Graham S B Laser scanning apparatus with beam position correction
US4277154A (en) * 1979-11-19 1981-07-07 Eltra Corporation Optical system for electro-optical scanner
WO1982003924A1 (fr) * 1981-05-07 1982-11-11 Stig Leopold Berglund Dispositif afocal pour le balayage opto-mecanique d'un objet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805749A1 (de) * 1968-10-29 1970-05-21 Licentia Gmbh Infrarot-Bildempfaenger fuer die Flugaufklaerung
US3790247A (en) * 1972-06-09 1974-02-05 Bendix Corp All reflective image space scanning device
GB2023369A (en) * 1978-06-16 1979-12-28 Philips Nv Device for two-dimensional infra-red scanning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8500435A1 *

Also Published As

Publication number Publication date
EP0148229A4 (fr) 1985-11-07
JPS61501592A (ja) 1986-07-31
WO1985000435A1 (fr) 1985-01-31

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19850318

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870103

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MCQUISTAN, GAVIN, WILLIAM