GB2150312A - Reproducing a planar pattern on a curved surface - Google Patents

Reproducing a planar pattern on a curved surface Download PDF

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Publication number
GB2150312A
GB2150312A GB08331432A GB8331432A GB2150312A GB 2150312 A GB2150312 A GB 2150312A GB 08331432 A GB08331432 A GB 08331432A GB 8331432 A GB8331432 A GB 8331432A GB 2150312 A GB2150312 A GB 2150312A
Authority
GB
United Kingdom
Prior art keywords
blank
block
image
planar
grid
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.)
Withdrawn
Application number
GB08331432A
Other versions
GB8331432D0 (en
Inventor
Stuart Douglas Miller
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.)
EMI Varian Ltd
Original Assignee
EMI Varian 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 EMI Varian Ltd filed Critical EMI Varian Ltd
Priority to GB08331432A priority Critical patent/GB2150312A/en
Publication of GB8331432D0 publication Critical patent/GB8331432D0/en
Publication of GB2150312A publication Critical patent/GB2150312A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
    • G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/24—Curved surfaces

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

An apparatus for reproducing a planar representation, e.g. of a control or focus grid of an electron gun, on the curved surface of e.g. a metal blank (20), comprises a fibre optic block (10) in the form of a bundle of optic fibres, arranged in side-by-side relationship. One end surface (11) of the block is planar and the opposite end surface (12) is hemispherical and conforms to the blank. A light source (40) may illuminate a shadow mask (30) which bears a planar representation of the control or focus grid and a lens (50) focuses an image of the representation onto the planar end surface of the block. This image is projected onto the curved surface of the blank which may bear a layer of photo resist. After exposure, the blank may be etched using photo etch techniques to form the desired grid structure. <IMAGE>

Description

SPECIFICATION Imaging apparatus This invention relates to an apparatus for reproduc log a planar image on a curved surface and it relates especially, although not exclusively, to such an apparatus used in the manufacture of the control or focus grid of an electron gun.
Typically, the control or focus grid of an electron gun comprises a hemispherical, mesh-like structure.
Conventionally the grid is produced by machining a hemispherical blank of molybdenum, say, using known spark erosion (EDM) techniques. This procedure tends to be both time consuming and inconvenient; moreover wear on the spark erosion tool and misalignment of the spark erosion tool and blank tends to detract from the quality of the finished product.
It is an object of this invention to substantially alleviate the above-described problem.
According to one aspect of the invention there is provided an apparatus suitable for reproducing an optical image of a planar pattern on a curved surface, said apparatus comprising a fibre optic block consisting of a bundle of fibres arranged fixedly in side-by-side relationship, one end of the block, defined by respective ends of the fibres in the bundles, being planar and the opposite end of the block being curved and a lens arranged to focus the image of said planar pattern at said one end so that said image is projected, in use, onto a said curved surface, conforming to, and lying against, said curved end of the block.
According to another aspect of the invention there is provided a method of manufacturing a control or focus grid of an electron gun comprising the steps of: providing a sheet metal blank for said grid having a a curved surface and bearing, at said surface, a layer of a photo resist, using an apparatus, as defined in the immediately preceding paragraph, to project an optical image of a shadow mask, representing the structure of the grid to be manufactured, onto the exposed surface of said layer, and then etching the blank.
In a preferred embodiment said curved surface is hemispherical. In another embodiment opposite sides of said blank are provided with respective layers of a photo resist and a first said apparatus is used to project an optical image of the shadow mask onto the exposed surface of said layer provided at one side of the blank and a second apparatus is used to project an optical image of the shadow mask onto the exposed surface of said layer provided at the opposite side of the blank.
In order that the invention may be carried into effect an embodiment is now described by reference to the only drawing which shows schematically an apparatus in accordance with the invention.
In this example, an apparatus in accordance with the invention is used in the manufacture of a control or focus grid of an electron gun; as described hereinbefore a grid of this kind usually has a hemispherical, mesh-like structure.
Atwo-dimensional representation of the grid is produced by suitably etching or milling a thin disc of metal thereby to produce a shadow mask. An apparatus of the present invention is used then to project an optical image of the representation onto a hemispherical blank prepared, for example, by pressing a thin sheet of molybdenum. The form of the two-dimensional representation is such that the projected image has the desired grid pattern.
The surface of the blank onto which the image is projected is provided with a layer of a photo resist.
After exposure to the image, the photo resist can be developed, and the blank etched, using known photo etch techniques to form the desired grid structure. it will be appreciated that a positive or a negative photo resist is used in dependence on whether the shadow mask is respectively a positive or a negative of the desired grid structure.
Referring now to the only Figure of the drawings, the apparatus used to project an image of the representation onto the blank comprises a fibre optic block 10. This block consists of a bundle of fibres arranged fixedly, in side-by-side relationship. Opposite ends of the block, defined by the ends of the fibres, are shaped so as to provide a planar surface 11 at one end of the block and and a convex, hemispherical surface 12 at the other end. The hemispherical surface receives a closely fitting blank, shown at 20, from which the grid is to be formed and, as described hereinbefore, the surface of the blank lying adjacent to surface 12 is provided with a layer of a photo resist. A planar shadow mask bearing a representation of the grid pattern is shown schematically at 30.A light source 40 illuminates the mask and a lens 50 focuses an image of the representation at the planar surface 11 of the block.
This image is projected, in turn, onto the exposed surface of the photo resist layer carried by the blank.
After exposure to the image the layer is developed and the blank is etched using known photo etch techniques to produce the desired grid structure.
It will be appreciated that the definition of the projected image will depend both on the number of fibres used in the block and their diameter; typically 750,000 fibres, each approximately 10 > m in diameter may be used.
Instead of projecting an image of the mask onto the concave surface of blank 20, alternatively the image may be projected onto the convex surface; in this circumstance block 10 is provided with a concave rather than a convex hemispherical surface.
In an alternative embodiment, two fibre optic blocks 10, 10' having respective hemispherical surfaces 12, 12', of opposite curvature, are used. The blocks are arranged, using a suitable jig, on opposite sides of the blank so that surfaces 12, 12' fit respectively against the concave and convex surfaces of the blank. Both surfaces are provided with a layer of a photo resist and so the time required for etching is effectively halved.
It will be appreciated that although the abovedescribed example relates to an apparatus used in the manufacture of a hemispherical grid for an electron gun the present invention is intended to encompass other applications requiring reproduction of a planar image on a generally curved, but not necessarily hemispherical, surface.

Claims (7)

1. An apparatus suitable for reproducing an optical image of a planar pattern on a curved surface, said apparatus comprising a fibre optic block consisting of a bundle of fibres arranged fixedly in side-by-side relationship, one end of the block, defined by respective ends of the fibres in the bundle, being planar and the opposite end of the block being curved and a lens arranged to focus the image of said planar pattern at said one end so that said image is projected, in use, onto a said curved surface, conforming to, and lying against, said curved end of the block.
2. An apparatus according to claim 1 wherein said opposite end of the block is hemispherical and convex.
3. An apparatus according to claim 1 wherein said opposite end of the block is hemispherical and concave.
4. A method of manufacturing a control or focus grid of an electron gun comprising the steps of: providing a sheet metal blank for said grid having a curved surface and bearing, at said surface, a layer of a photo resist, using an apparatus according to claims 1 to 3 to project an optical image of a shadow mask, representing the structure of the grid to be manufactured, onto the exposed surface of said layer, and then etching the blank.
5. A method according to claim 4 including providing a sheet metal blank having respective layers of a photo resist on opposite sides of the blank, using a first said apparatus to project an optical image of the shadow mask onto the exposed surface of said layer provided at one side of the blank and using a second said apparatus to project an optical image of the shadow mask onto the exposed surface of said layer provided at the opposite side of the blank.
6. An apparatus substantially as hereinbefore described by reference to and as illustrated in the accompanying drawings.
7. A method substantially as hereinbefore described.
GB08331432A 1983-11-24 1983-11-24 Reproducing a planar pattern on a curved surface Withdrawn GB2150312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08331432A GB2150312A (en) 1983-11-24 1983-11-24 Reproducing a planar pattern on a curved surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08331432A GB2150312A (en) 1983-11-24 1983-11-24 Reproducing a planar pattern on a curved surface

Publications (2)

Publication Number Publication Date
GB8331432D0 GB8331432D0 (en) 1984-01-04
GB2150312A true GB2150312A (en) 1985-06-26

Family

ID=10552307

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08331432A Withdrawn GB2150312A (en) 1983-11-24 1983-11-24 Reproducing a planar pattern on a curved surface

Country Status (1)

Country Link
GB (1) GB2150312A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0385013A1 (en) * 1989-03-03 1990-09-05 Trw Inc. Production of precision patterns on curved surfaces
FR2686427A1 (en) * 1992-01-20 1993-07-23 Essilor Int Optical combination and exposure device employing such a combination
WO1998047049A1 (en) * 1997-04-11 1998-10-22 Hughes Electronics Corporation Apertured nonplanar electrodes and forming methods
WO2002103455A2 (en) * 2001-06-18 2002-12-27 Bmc Industries, Inc. Method and apparatus for imaging with fiber optic arrays on non-flat surfaces

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1031827A (en) * 1962-12-29 1966-06-02 Texas Instruments Inc Thermally responsive electrical switch
GB1180914A (en) * 1966-04-07 1970-02-11 Int Photon Corp Improvements in or relating to Photographic Type-composing Machines.
GB1483878A (en) * 1975-08-02 1977-08-24 Pilkington Perkin Elmer Ltd Optical apparatus
GB2094056A (en) * 1981-03-03 1982-09-08 English Electric Valve Co Ltd Photocathodes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1031827A (en) * 1962-12-29 1966-06-02 Texas Instruments Inc Thermally responsive electrical switch
GB1180914A (en) * 1966-04-07 1970-02-11 Int Photon Corp Improvements in or relating to Photographic Type-composing Machines.
GB1483878A (en) * 1975-08-02 1977-08-24 Pilkington Perkin Elmer Ltd Optical apparatus
GB2094056A (en) * 1981-03-03 1982-09-08 English Electric Valve Co Ltd Photocathodes

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0385013A1 (en) * 1989-03-03 1990-09-05 Trw Inc. Production of precision patterns on curved surfaces
FR2686427A1 (en) * 1992-01-20 1993-07-23 Essilor Int Optical combination and exposure device employing such a combination
US5347398A (en) * 1992-01-20 1994-09-13 Essilor International Cie Generale D'optique Optical system for forming an image of a plane on a spherical surface
WO1998047049A1 (en) * 1997-04-11 1998-10-22 Hughes Electronics Corporation Apertured nonplanar electrodes and forming methods
US5934965A (en) * 1997-04-11 1999-08-10 Hughes Electronics Corporation Apertured nonplanar electrodes and forming methods
WO2002103455A2 (en) * 2001-06-18 2002-12-27 Bmc Industries, Inc. Method and apparatus for imaging with fiber optic arrays on non-flat surfaces
WO2002103455A3 (en) * 2001-06-18 2003-11-20 Bmc Ind Inc Method and apparatus for imaging with fiber optic arrays on non-flat surfaces
US6682875B2 (en) * 2001-06-18 2004-01-27 Bmc Industries, Inc. Method and apparatus for imaging with fiber optic arrays on non-flat surfaces

Also Published As

Publication number Publication date
GB8331432D0 (en) 1984-01-04

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