CA2005352A1 - Graduated filter - Google Patents

Graduated filter

Info

Publication number
CA2005352A1
CA2005352A1 CA 2005352 CA2005352A CA2005352A1 CA 2005352 A1 CA2005352 A1 CA 2005352A1 CA 2005352 CA2005352 CA 2005352 CA 2005352 A CA2005352 A CA 2005352A CA 2005352 A1 CA2005352 A1 CA 2005352A1
Authority
CA
Canada
Prior art keywords
toothed
rotary axles
belt
filter
belt drive
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.)
Granted
Application number
CA 2005352
Other languages
French (fr)
Other versions
CA2005352C (en
Inventor
Saverio Sanvido
Gerard Marquis
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.)
Rheinmetall Air Defence AG
Original Assignee
Oerlikon Contraves AG
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 Oerlikon Contraves AG filed Critical Oerlikon Contraves AG
Publication of CA2005352A1 publication Critical patent/CA2005352A1/en
Application granted granted Critical
Publication of CA2005352C publication Critical patent/CA2005352C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/205—Neutral density filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/006—Filter holders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optical Filters (AREA)
  • Blocking Light For Cameras (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

A preferred embodiment of the graduated filter comprises two bearings for the rotary axles of the two filter discs. The rotary axles are driven by a motor via a belt drive. The belt drive comprises a double belt pulley at the drive shaft of the motor and two toothed belts which wrap around respective toothed-belt pulleys mounted at the rotary axles. Compared with known toothed-wheel gearing, the belt drive is less expensive, more practical, wear-resisting and lighter in weight. The plane of the intersecting axes of rotation of the rotary axles is slightly inclined with respect to the direction of the optical axis of the graduated filter. By virtue of the angular adjustment of the axes of rotation of the rotary axles of the two filter discs, it is rendered possible that the toothed belts snugly fit the running surfaces of the respective toothed-belt pulleys, so that the latter and the toothed belts are uniformly loaded, thus increasing service life thereof and ensuring constant transmission of force.
CA 2005352 1988-12-22 1989-12-13 Graduated filter Expired - Fee Related CA2005352C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH474688 1988-12-22
CH04,746/88-1 1988-12-22

Publications (2)

Publication Number Publication Date
CA2005352A1 true CA2005352A1 (en) 1990-06-22
CA2005352C CA2005352C (en) 1999-09-07

Family

ID=4281801

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2005352 Expired - Fee Related CA2005352C (en) 1988-12-22 1989-12-13 Graduated filter

Country Status (6)

Country Link
EP (1) EP0374565B1 (en)
BR (1) BR8906425A (en)
CA (1) CA2005352C (en)
DE (1) DE58904732D1 (en)
EG (1) EG18768A (en)
TR (1) TR24004A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI258600B (en) * 2005-02-16 2006-07-21 Prodisc Technology Inc Light splitter device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2246270A1 (en) * 1971-09-23 1973-03-29 Ferranti Ltd DEVICE FOR FORMATION OF AN OPTICAL OPENING WITH VARIABLE AREA
GB2074339B (en) * 1980-04-18 1984-01-18 Ferranti Ltd Optical attenuator
US4443696A (en) * 1981-08-28 1984-04-17 John Taboada Optical beam intensity control system
US4778263A (en) * 1987-05-29 1988-10-18 The United States Of America As Respresented By The Department Of Energy Variable laser attenuator

Also Published As

Publication number Publication date
EP0374565A3 (en) 1990-10-31
EP0374565B1 (en) 1993-06-16
BR8906425A (en) 1990-08-28
EP0374565A2 (en) 1990-06-27
EG18768A (en) 1994-01-30
DE58904732D1 (en) 1993-07-22
TR24004A (en) 1991-03-01
CA2005352C (en) 1999-09-07

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed