US 11,868,087 B2
Method and device for producing a computer-generated hologram, hologram, and lighting device for a vehicle
Markus Giehl, Jena (DE)
Assigned to Hella GmbH & CO KGAA, Lippstadt (DE)
Filed by Hella GmbH & Co. KGaA, Lippstadt (DE)
Filed on Oct. 12, 2021, as Appl. No. 17/499,344.
Application 17/499,344 is a continuation of application No. PCT/EP2020/057754, filed on Mar. 20, 2020.
Claims priority of application No. 10 2019 109 437.2 (DE), filed on Apr. 10, 2019.
Prior Publication US 2022/0026850 A1, Jan. 27, 2022
Int. Cl. G03H 1/26 (2006.01); F21S 41/16 (2018.01); F21S 41/20 (2018.01); G03H 1/02 (2006.01)
CPC G03H 1/26 (2013.01) [F21S 41/16 (2018.01); F21S 41/285 (2018.01); G03H 1/02 (2013.01); G03H 1/265 (2013.01); G03H 2270/21 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of producing a computer-generated hologram, the method comprising:
producing a reference beam;
producing an object beam;
applying computer-generated information regarding the hologram to the object beam; and
overlapping the object beam and the reference beam on or in a light-sensitive recording medium in order to apply the hologram by exposure,
wherein several 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 produce a plurality of sub-holograms,
wherein 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, and
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 a lens through which the reference beam passes on the way to the light-sensitive recording medium, and
wherein the reference beam passes through an immersion agent or an immersion liquid that is arranged between the lens and the light-sensitive recording medium or a substrate carrying the light-sensitive recording medium.