Patent ID: 11868087
Assignee: HELLA GMBH & CO. KGAA
Field: Optics (Instruments)
Classification: CPC G  F | IPC F  G

Claim 11:
12. A device for producing a computer-generated hologram, the device comprising:
a light source for producing a light beam;
at least one first optics to split the light beam produced by the light source into an object beam and a reference beam;
a modulator to imprint information relating to the hologram onto the object beam;
at least one second optics to overlap the object beam and the reference beam on or in a light-sensitive recording medium in order to apply the hologram by exposure, wherein, during operation of the device, a plurality of portions of the light-sensitive recording medium are exposed, one after the other, to the object beam and the reference beam substantially simultaneously in order to form sub-holograms,
wherein the at least one second optics to overlap the object beam and the reference beam is designed such that a first angle of incidence at which the reference beam hits a first portion of a surface of the light-sensitive recording medium is different from a second angle of incidence at which the reference beam hits a second portion of the surface of the light-sensitive recording medium,
wherein the at least one second optics to overlap the object beam and the reference beam comprises at least one lens through which the reference beam passes on the way to the light-sensitive recording medium,
wherein a change between the first and second angles of incidence of the reference beam is achieved by changing a point of incidence of the reference beam on the at least one lens, and
wherein the device comprises an immersion agent or an immersion liquid arranged between the at least one lens of the at least one second optics and the light-sensitive recording medium or a substrate carrying the light-sensitive recording medium, such that the reference beam passes through the immersion agent or the immersion liquid.