ES368124A1 - A device for focus maintaining in an optical instrument - Google Patents

A device for focus maintaining in an optical instrument

Info

Publication number
ES368124A1
ES368124A1 ES368124A ES368124A ES368124A1 ES 368124 A1 ES368124 A1 ES 368124A1 ES 368124 A ES368124 A ES 368124A ES 368124 A ES368124 A ES 368124A ES 368124 A1 ES368124 A1 ES 368124A1
Authority
ES
Spain
Prior art keywords
cell
flux
electromagnet
focusing
focus
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
ES368124A
Other languages
Spanish (es)
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of ES368124A1 publication Critical patent/ES368124A1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/24—Base structure
    • G02B21/241—Devices for focusing

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Telescopes (AREA)
  • Microscoopes, Condenser (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

Automatic focusing of an optical instrument is obtained by moving the objective lens rectilinearly parallel to its optical axis in accordance with the increase or decrease in the light received in a light sensitive system after passing through an element which produces substantial spherical aberration of the image. The objective lens 1 is mounted in the centre of thin annular plate 5 which forms the armature of electromagnet 6. The image from lens 1 passes through binocular 11 one part going to an eyepiece and the other part to a spherical aberration variator 12 which converts the variations in contrast due to focusing into variations in luminous flux. This flux passes through a further binocular to lenses 18, 17, to photo-resistive cell 15 and photo-emissive cell 14. The lenses 18, 17 are adjusted so that cell 15 receives the flux from the field of view in the focusing plane and cell 14 receives flux from the same field of view but outside the focusing plane. By this arrangement changes in overall illumination produce opposite effects in the detectors 14, 15 which cancel and have no effect on the energization of the electromagnet. Variation in focus will however only affect the illumination of photoresistor 15 and will cause a change in the energization of electromagnet 6 to restore the focus.
ES368124A 1968-06-07 1969-06-07 A device for focus maintaining in an optical instrument Expired ES368124A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR154273 1968-06-07

Publications (1)

Publication Number Publication Date
ES368124A1 true ES368124A1 (en) 1971-05-01

Family

ID=8650936

Family Applications (1)

Application Number Title Priority Date Filing Date
ES368124A Expired ES368124A1 (en) 1968-06-07 1969-06-07 A device for focus maintaining in an optical instrument

Country Status (8)

Country Link
BE (1) BE733535A (en)
CH (1) CH508890A (en)
DE (1) DE1928432B2 (en)
ES (1) ES368124A1 (en)
FR (1) FR1577489A (en)
GB (1) GB1260245A (en)
LU (1) LU58775A1 (en)
NL (1) NL6908620A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10106698A1 (en) 2001-02-14 2002-08-29 Leica Microsystems Method and device for automatically focusing an optical device
AT511936B1 (en) 2011-12-01 2013-04-15 Tannpapier Gmbh MUNDSTÜCKBELAGSPAPIER FOR A SMOKE ITEM
AT512347B1 (en) 2011-12-23 2013-09-15 Tannpapier Gmbh AS A FILM TRAINED MOUTHPIECE OF A FILTER CIGARETTE
AT513413B1 (en) 2012-09-17 2014-12-15 Tannpapier Gmbh Layered composite on a smoking article

Also Published As

Publication number Publication date
CH508890A (en) 1971-06-15
LU58775A1 (en) 1969-10-28
DE1928432A1 (en) 1969-12-11
NL6908620A (en) 1969-12-09
DE1928432B2 (en) 1971-12-02
FR1577489A (en) 1969-08-08
BE733535A (en) 1969-11-03
GB1260245A (en) 1972-01-12

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