US 12,188,840 B1
Refractive periscope for extended-pupil parallelism and virtual imaging distance measurements
Pengfei Wu, Bellevue, WA (US)
Assigned to MLOptic Corp., Redmond, WA (US)
Filed by MLOptic Corp, Redmond, WA (US)
Filed on Apr. 26, 2024, as Appl. No. 18/647,481.
Application 18/647,481 is a continuation in part of application No. 18/385,035, filed on Oct. 30, 2023, granted, now 11,971,249.
Int. Cl. G01M 11/02 (2006.01); G02B 27/00 (2006.01)
CPC G01M 11/0221 (2013.01) [G01M 11/0207 (2013.01); G01M 11/0257 (2013.01); G02B 27/0081 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical system for measuring a parallelism of light rays of a light emitter and virtual imaging distances (VIDs) of the light emitter, said optical system comprising:
(a) an enclosure comprising a front end and a rear end;
(b) a pair of apertures configured to be disposed on a front plane on said front end of said enclosure; and
(c) a single optical lens system disposed between said front end and said rear end of said enclosure,
wherein a first aperture of said pair of apertures is configured to allow a first set of light rays into said enclosure to enter through a front face of said single optical lens system and to exit through a rear face of said single optical lens system to be cast on an imaging plane as a first spot and a second aperture of said pair of apertures is configured to allow a second set of light rays into said enclosure to enter through the front face of said single optical lens system and to exit through the rear face of said single optical lens system to be cast on the imaging plane as a second spot, the imaging plane being parallel to said front plane, wherein a parallelism of the first set of light rays with respect to the second set of light rays is based on a correspondence of a distance between said first spot and said second spot with a distance between the first set of light rays and the second set of light rays and a VID of the light emitter is based at least in part on an offset of the imaging plane from the focus position of said single optical lens system when the light emitter is not optically disposed at infinity.