Holographic foil and method for producing same

Patent metadata

Field	Value
Publication number	US-2016306089-A1
Application number	US-201414783833-A
Country	US
Kind code	A1
Filing date	Apr 3, 2014
Priority date	Apr 9, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

Described is a holographic film ( 100 ) whose transmission and/or reflection properties vary periodically along at least one of its directions of principal extent, said film being designed for at least partial transmission ( 22, 28 ) of light ( 20, 26 ) of at least one first wavelength range that is irradiated from a multiplicity of periodically disposed illuminants ( 200 ) and that impinges on the holographic film ( 100 ). Also described are a lighting means ( 300 ), a backlighting means and a method for producing a holographic film ( 100 ).

First claim

1 . Holographic foil, whose transmission and/or reflection properties vary periodically in at least one of its main extension directions and which is designed to at least partially transmit light from at least one first wavelength range emitted by a multiplicity of periodically arranged lighting means and impinging upon the holographic foil.

2 . Holographic foil according to claim 1 , comprising a first multiplicity of periodically arranged regions which are formed as reflection holograms.

3 . Holographic foil according to claim 1 , wherein the reflection holograms are arranged at regular intervals in at least one main extension direction of the holographic foil.

4 . Holographic foil according to claim 2 , wherein the reflection holograms are designed to partially diffusely reflect light emitted by the lighting means.

5 . Holographic foil according to claim 1 , comprising a second multiplicity of periodically arranged regions which are formed as transmission holograms.

6 . Holographic foil according to claim 5 , wherein the transmission holograms are each designed in a ring-shaped manner, wherein the centre points of the rings are arranged at regular intervals in at least one main extension direction of the holographic foil.

7 . Holographic foil according to claim 5 , wherein the transmission holograms are designed to collimate light, emitted by the lighting means and transmitted by the transmission holograms, in a main emission direction.

8 . Holographic foil according to claim 3 , wherein the regular intervals are between 5 cm and 40 cm.

9 . Illumination device, comprising a holographic foil according to claim 1 , and a first multiplicity of periodically arranged lighting means which are designed to emit light from the at least one first wavelength range.

10 . Illumination device according to claim 9 , wherein the multiplicity of periodically arranged lighting means includes a multiplicity of light-emitting diodes.

11 . Illumination device according to claim 9 , comprising a holographic foil according to claim 2 , wherein at each of the lighting means, the region of the holographic foil is formed as a reflection hologram in each case, which region is arranged downstream of the respective lighting means in a viewing direction perpendicular to the two main extension directions of the holographic foil.

12 . Illumination device according claim 9 , further comprising a diffuser which is designed to diffusely scatter the light transmitted from the holographic foil.

13 . Illumination device according to claim 9 , further comprising
a second multiplicity of periodically arranged lighting means which are designed to emit light from at least one second wavelength range, and a third multiplicity of periodically arranged lighting means which are designed to emit light from at least one third wavelength range, wherein the holographic foil is further designed to at least partially transmit light emitted by the second multiplicity of lighting means and impinging upon the holographic foil, and wherein the holographic foil is further designed to at least partially transmit light emitted by the third multiplicity of lighting means and impinging upon the holographic foil.

14 . Back-lighting device, comprising
an illumination device according to claim 9 , and holding means for an element to be backlit.

15 . Method for producing a holographic foil according to claim 1 , comprising the following method steps:
providing a layer consisting of a holographic material, and exposing the layer to light using at least one reference wave from the first wavelength range in a reference direction and at the same time using at least one first signal wave from the first wavelength range, wherein the signal wave is radiated in a first multiplicity of regions on the other side of the layer to the reference wave, and wherein the signal wave is radiated in a second multiplicity of regions on the same side of the layer as the reference wave.

16 . Holographic foil, whose transmission and/or reflection properties vary periodically in at least one of its main extension directions and which is designed to at least partially transmit light from at least one first wavelength range emitted by a multiplicity of periodically arranged lighting means and impinging upon the holographic foil, wherein
the holographic foil comprises a first multiplicity of periodically arranged regions which are formed as reflection holograms, and the holographic foil comprises a second multiplicity of periodically arranged regions which are formed as transmission holograms.

17 . Holographic foil according to claim 16 , wherein
the transmission holograms are each designed in a ring-shaped manner, wherein the centre points of the rings are arranged at regular intervals in at least one main extension direction of the holographic foil, and the regular intervals are between 5 cm and 40 cm.

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Morgott Stefan
• Reill Joachim
• Brick Peter

Classifications

• F21Y2113/13

  comprising an assembly of point-like light sources · CPC title

• G02B27/30

  Collimators · CPC title

• G02B5/32 Primary

  Holograms used as optical elements · CPC title

• G02B5/0252

  using holographic or diffractive means · CPC title

• G03H2001/0439

  for recording Holographic Optical Element [HOE] · CPC title