GB1260245A - A device for focus maintaining in an optical instrument - Google Patents

A device for focus maintaining in an optical instrument

Info

Publication number
GB1260245A
GB1260245A GB2638269A GB2638269A GB1260245A GB 1260245 A GB1260245 A GB 1260245A GB 2638269 A GB2638269 A GB 2638269A GB 2638269 A GB2638269 A GB 2638269A GB 1260245 A GB1260245 A GB 1260245A
Authority
GB
United Kingdom
Prior art keywords
focusing
cell
flux
electromagnet
photo
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
GB2638269A
Inventor
Roland Le Go
Marcel Locquin
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 GB1260245A publication Critical patent/GB1260245A/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

1,260,245. Photo-electric control of focusing. COMMISSARIAT A L'ENERGIE ATOMIQUE. May 23, 1969 [June 7, 1968], No.26382/69. Heading G1A. [Also in Division G2-3] 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.
GB2638269A 1968-06-07 1969-05-23 A device for focus maintaining in an optical instrument Expired GB1260245A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1260245A true GB1260245A (en) 1972-01-12

Family

ID=8650936

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2638269A Expired GB1260245A (en) 1968-06-07 1969-05-23 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6884980B2 (en) 2001-02-14 2005-04-26 Leica Microsystems Ag Method and apparatus for automatic focusing of an optical device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6884980B2 (en) 2001-02-14 2005-04-26 Leica Microsystems Ag Method and apparatus for automatic focusing of an optical device

Also Published As

Publication number Publication date
CH508890A (en) 1971-06-15
BE733535A (en) 1969-11-03
ES368124A1 (en) 1971-05-01
LU58775A1 (en) 1969-10-28
FR1577489A (en) 1969-08-08
DE1928432B2 (en) 1971-12-02
NL6908620A (en) 1969-12-09
DE1928432A1 (en) 1969-12-11

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees