FR2315704A1 - Straight or circular optical wedge filter prodn. - filter has point shaped elements whose density changes from edge to edge - Google Patents

Straight or circular optical wedge filter prodn. - filter has point shaped elements whose density changes from edge to edge

Info

Publication number
FR2315704A1
FR2315704A1 FR7618852A FR7618852A FR2315704A1 FR 2315704 A1 FR2315704 A1 FR 2315704A1 FR 7618852 A FR7618852 A FR 7618852A FR 7618852 A FR7618852 A FR 7618852A FR 2315704 A1 FR2315704 A1 FR 2315704A1
Authority
FR
France
Prior art keywords
edge
filter
shaped elements
prodn
straight
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
FR7618852A
Other languages
French (fr)
Other versions
FR2315704B1 (en
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.)
Dr Johannes Heidenhain GmbH
Original Assignee
Dr Johannes Heidenhain GmbH
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 Dr Johannes Heidenhain GmbH filed Critical Dr Johannes Heidenhain GmbH
Publication of FR2315704A1 publication Critical patent/FR2315704A1/en
Application granted granted Critical
Publication of FR2315704B1 publication Critical patent/FR2315704B1/fr
Granted 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
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Diaphragms For Cameras (AREA)
  • Liquid Crystal (AREA)

Abstract

A wedge filter is produced using a screen (V) whose surface structure has a uniform mean optical density. It is fixed in a material support (T) by photo-mechanical reproduction by an illumination, changing from edge to edge, of the screen structure and adjustec to the required optical density variation. Advantageously the support (T) is in the form of a ground glass plate upon which a light sensitive layer is carried over by means of changing light. The illumination can be realised by an interposed shutter subjected to an oscillatory movement to vary the light as it moves from one edge to the other. The point-shaped elements thereby increase in size across the layer.
FR7618852A 1975-06-24 1976-06-21 Straight or circular optical wedge filter prodn. - filter has point shaped elements whose density changes from edge to edge Granted FR2315704A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752528039 DE2528039C3 (en) 1975-06-24 1975-06-24 Process for the production of optical gray wedges

Publications (2)

Publication Number Publication Date
FR2315704A1 true FR2315704A1 (en) 1977-01-21
FR2315704B1 FR2315704B1 (en) 1980-04-18

Family

ID=5949806

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7618852A Granted FR2315704A1 (en) 1975-06-24 1976-06-21 Straight or circular optical wedge filter prodn. - filter has point shaped elements whose density changes from edge to edge

Country Status (3)

Country Link
CH (1) CH594909A5 (en)
DE (1) DE2528039C3 (en)
FR (1) FR2315704A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027704C2 (en) * 1980-07-22 1984-03-22 Standard Elektrik Lorenz Ag, 7000 Stuttgart Process for the production of a correction filter for the exposure of the fluorescent screens of color picture tubes

Also Published As

Publication number Publication date
CH594909A5 (en) 1978-01-31
DE2528039A1 (en) 1976-12-30
DE2528039B2 (en) 1977-07-21
FR2315704B1 (en) 1980-04-18
DE2528039C3 (en) 1978-03-23

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Legal Events

Date Code Title Description
ST Notification of lapse