Holographic foil and method for producing same
AssigneeOSRAM Opto Semiconductor GmbH
InventorsStefan Morgott, Joachim Reill, Peter Brick
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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).
Claims14
A 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 each of a multiplicity of periodically arranged lighting means and impinging upon the holographic foil, the holographic foil comprising:
- a first multiplicity of periodically arranged regions which are formed as reflection holograms, designed to reflect light of the first wavelength range, and
- a second multiplicity of periodically arranged regions which are formed as transmission holograms, designed to transmit light of the first wavelength range,
- wherein the transmission holograms are each formed in a ring-shaped manner around one of the reflection holograms, respectively.
An illumination device, comprising:
- a first multiplicity of periodically arranged lighting means which are designed to emit light from at least one first wavelength range;
- and
- a holographic foil, whose transmission and reflection properties vary periodically in at least one of its main extension directions and which is designed to at least partially transmit light from the at least one first wavelength range emitted by each of the first 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, designed to reflect light of the at least one first wavelength range, and
- a second multiplicity of periodically arranged regions which are formed as transmission holograms, designed to transmit light of the first wavelength range, wherein the transmission holograms are each formed in a ring-shaped manner around one of the reflection holograms, respectively, and
- 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 two main extension directions of the holographic foil such that the light of the at least one first wavelength range, which is transmitted through the holographic foil, has a homogeneous light density.
A 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 each of a multiplicity of periodically arranged lighting means and impinging upon the holographic foil, the holographic foil comprising:
- a first multiplicity of periodically arranged regions which are formed as reflection holograms;
- and
- a second multiplicity of periodically arranged regions which are formed as transmission holograms,
- wherein the transmission holograms are each formed in a ring-shaped manner around one of the reflection holograms, respectively,
- wherein the transmission and reflection properties of the holographic foil vary with the same period which is provided for the periodic arrangement of the lighting means so that a homogeneous light density can be achieved.
Dependencies are inferred from the claim text.