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GB362725A - Improvements in optical focussing devices - Google Patents

Improvements in optical focussing devices

Info

Publication number
GB362725A
GB362725A GB111331A GB111331A GB362725A GB 362725 A GB362725 A GB 362725A GB 111331 A GB111331 A GB 111331A GB 111331 A GB111331 A GB 111331A GB 362725 A GB362725 A GB 362725A
Authority
GB
United Kingdom
Prior art keywords
tube
focusing
sleeve
eyepiece
prevented
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
GB111331A
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.)
Thales Optronics Ltd
Original Assignee
Thales Optronics Ltd
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 Thales Optronics Ltd filed Critical Thales Optronics Ltd
Priority to GB111331A priority Critical patent/GB362725A/en
Publication of GB362725A publication Critical patent/GB362725A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Telescopes (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

362,725. Optical focusing-devices. BARR & STROUD, Ltd. and FRENCH, J. W., Caxton Street, Anniesland, Glasgow. Jan. 13, 1931, No. 1113. [Class 97 (i).] An optical focusing device is provided with extensible means arranged to prevent access of air or atmospheric moisture to the instrument through the space between the members of the device which are relatively displaceable in the process of focusing. Fig. 2 shows a focusing eyepiece in which a lens A is mounted in a tube 2 which can be displaced within a tube 3. The means for excluding moisture &c. comprises, in the form shown, a flexible sleeve 9 attached at one end 6 to the tube 2 and at the other end 7 to a base 8 associated with the support 3. Fig. 4 shows the invention applied to an eyepiece having mechanical focusing, the longitudinal movement of the tube 2 being effected by rotating a sleeve 11 having on its inner surface a helical scroll engaging a corresponding recessed scroll on the outer surface of the tube 2. Rotation of the tube 2 is prevented by a pin 15 entering a hole in the member 3, and longitudinal movement of the sleeve 11 is prevented by a ring 13. An inner tube 14 is provided to support the flexible sleeve 9 and prevent the latter from sagging inwards.
GB111331A 1931-01-13 1931-01-13 Improvements in optical focussing devices Expired GB362725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB111331A GB362725A (en) 1931-01-13 1931-01-13 Improvements in optical focussing devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB111331A GB362725A (en) 1931-01-13 1931-01-13 Improvements in optical focussing devices

Publications (1)

Publication Number Publication Date
GB362725A true GB362725A (en) 1931-12-10

Family

ID=9716380

Family Applications (1)

Application Number Title Priority Date Filing Date
GB111331A Expired GB362725A (en) 1931-01-13 1931-01-13 Improvements in optical focussing devices

Country Status (1)

Country Link
GB (1) GB362725A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851924A (en) * 1955-09-28 1958-09-16 Nl Instr Cie Nedinsco Nv Adjustable ocular mounting
US3246563A (en) * 1962-09-26 1966-04-19 Milton L Quammen Telescopic eyepiece assembly with static and dynamic bellows-type seal
DE2527760A1 (en) * 1975-06-21 1976-12-23 Lange Karl Hans RETRORE-REFLECTIVE FILM AND METHOD OF MANUFACTURING IT
EP1189091A2 (en) * 2000-09-13 2002-03-20 Leica Microsystems AG Collar for eyepiece barrel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851924A (en) * 1955-09-28 1958-09-16 Nl Instr Cie Nedinsco Nv Adjustable ocular mounting
US3246563A (en) * 1962-09-26 1966-04-19 Milton L Quammen Telescopic eyepiece assembly with static and dynamic bellows-type seal
DE2527760A1 (en) * 1975-06-21 1976-12-23 Lange Karl Hans RETRORE-REFLECTIVE FILM AND METHOD OF MANUFACTURING IT
EP1189091A2 (en) * 2000-09-13 2002-03-20 Leica Microsystems AG Collar for eyepiece barrel
EP1189091A3 (en) * 2000-09-13 2004-09-15 Leica Microsystems AG Collar for eyepiece barrel

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