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EP0403134A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Holograms

Assignee: BTG International Ltd
•
Filing: 1990-06-04
•
Granted: —
•
Expires: 2010-06-04
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Abstract

Abstract There is described an article which comprises on its outside a light-transparent visual display feature through which a graphic design or a solid object can be seen, the light-transparent visual display feature comprising a light-transparent film sheet which contains a Lippman-Bragg reflection hologram which has a viewing angle of not more than 20° either side of a selected viewing axis or axes and a depth of holographic image which is not more than 5mm on one side or the other of the image plane. When the article of the present invention is a package, the restricted view is advantageously prepared to be around a vertical axis relative to the observer so that as an observer passes the illuminated package laterally with the hologram on the vertical face, the hologram will suddenly come into view and just as suddenly slip from view as viewing angle is passed. When the article of the present invention is an ID card, the transparent film material bearing the hologram is laminated on to the top surface of the card which bears a graphic design relevant to the holder of the card.

Inventors

  • 👤 Glenn Peter Wood
  • 👤 Anthony Ian Hopwood

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 15:14
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; B; B65; B65D; B65D5/00; B65D5/42; B65D5/4204; G03H1/22; G03H1/24; G09; G09F; G09F3/00; G03H1/0005; G03H1/0011; G03H1/26; G03H1/2645; G03H1/265; G03H2001/0055; G03H1/2202; G03H2001/2223; G03H2001/2231; G03H2001/2236; G03H1/2249; G03H2001/2273

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 87 words
An article which comprises on its outside a light-transparent visual display feature through which a graphic design or a solid object can be seen, the article being characterised in that the light-transparent visual display feature comprises a light-transparent film sheet which contains a Lippman-Bragg reflection hologram which has a viewing angle of not more than 20° either side a selected viewing axis or axes and a depth of holographic image which is not more than 5 mm on one side or the other of the image plane.
Claim 2
Dependent Claim 87 words
An article which comprises on its outside a light-transparent visual display feature through which a graphic design or a solid object can be seen, the article being characterised in that the light-transparent visual display feature comprises a light-transparent film sheet which contains a Lippman-Bragg reflection hologram which has a viewing angle of not more than 20° either side a selected viewing axis or axes and a depth of holographic image which is not more than 5 mm on one side or the other of the image plane.
Claim 3
Dependent Claim 82 words
An article according to claim 1 which is a package composed of a covering having a transparent window in the covering through which the objects contained therein can be seen, the article being characterised in that the transparent window comprising a Lippman-Bragg reflection hologram which has a viewing angle of not more than 20° either side of the normal and a depth of holographic image which is not more than 5 mm on one side or the other of the image plane.
Claim 4
Dependent Claim 22 words
An article according to claim 2 characterised in that the article is a cardboard box with a portion cut-out in one side.
Claim 5
Dependent Claim 29 words
An article according to claim 1 characterised in that the article is a box at least one side of which comprises a reflection hologram as defined in claim 1.
Claim 6
Dependent Claim 51 words
An article according to claim 4 characterised in that the information on the hologram is exactly the same as some of the information on the box and the hologram is affixed on the box so that the information on the hologram is in register with the same information on the box.
Claim 7
Dependent Claim 35 words
An article according to claim 1 characterised in that the article is a card on which is present a graphic design, the said graphic design being covered by the light-transparent film sheet bearing a hologram.
Claim 8
Dependent Claim 23 words
An article according to claim 1 characterised in that the Lippman-Bragg hologram is silver halide sensitised material, dichromated gelatin or a photopolymerisation mixture.
Claim 9
Dependent Claim 28 words
An article according to claim 7 characterised in that the silver halide sensitised material contains silver halide crystals having an average size of from 0.02 to 0.05 µm.
Claim 10
Dependent Claim 32 words
An article according to claim 8 characterised in that the hologram has been prepared using a He:Ne laser and processed in a silver halide development bath followed by a rehalogenating bleach bath.

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