US 12,436,402 B2
Reticle overlaid within a galilean magnification system
Andrii Volkov, London (GB)
Assigned to TRULIFE OPTICS LTD., London (GB)
Filed by TruLife Optics Ltd., London (GB)
Filed on Dec. 16, 2021, as Appl. No. 17/552,999.
Claims priority of application No. 2020012 (GB), filed on Dec. 17, 2020.
Prior Publication US 2022/0282954 A1, Sep. 8, 2022
Int. Cl. G02B 27/34 (2006.01); G02B 5/32 (2006.01); G02B 9/10 (2006.01); G02B 25/00 (2006.01); G03H 1/04 (2006.01)
CPC G02B 27/34 (2013.01) [G02B 5/32 (2013.01); G02B 9/10 (2013.01); G02B 25/001 (2013.01); G03H 1/0402 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An optical system, comprising:
a Galilean magnification device comprising an objective lens and an eyepiece lens arranged along an axis;
wherein one of the objective lens and the eyepiece lens is a positive lens and the other is a negative lens, thereby defining an image working distance;
a reticle device in the Galilean magnification device, the reticle device comprising a holographic reticle element recorded in a holographic material as an interference pattern;
wherein the reticle device is configured to receive light to illuminate the holographic reticle element from off the axis and to diffract the received light through the holographic reticle element and onto the axis to replay an image of the holographic reticle element, so that light from the holographic reticle element is set at the image working distance by the eyepiece lens to allow the replayed image of the holographic reticle element to be viewed; and
wherein the holographic element further comprises a hologram or holographic optical element positioned along the axis between the objective lens and the eyepiece lens.