US 11,695,915 B1
Apparatus and method for imaging lens alignment using a virtual test image
Wui Fung Sze, Hong Kong (HK); Jiangwen Deng, Hong Kong (HK); and Hei Lam Chang, Hong Kong (HK)
Assigned to ASMPT SINGAPORE PTE. LTD., Singapore (SG)
Filed by ASMPT SINGAPORE PTE. LTD., Singapore (SG)
Filed on Feb. 15, 2022, as Appl. No. 17/671,658.
Int. Cl. H04N 5/335 (2011.01); H04N 17/00 (2006.01); G03H 1/22 (2006.01); G02B 27/62 (2006.01); G02B 3/14 (2006.01); H04N 23/54 (2023.01); H04N 23/55 (2023.01); H04N 23/56 (2023.01)
CPC H04N 17/002 (2013.01) [G02B 3/14 (2013.01); G02B 27/62 (2013.01); G03H 1/2205 (2013.01); G03H 1/2286 (2013.01); H04N 23/54 (2023.01); H04N 23/55 (2023.01); H04N 23/56 (2023.01); G03H 2001/221 (2013.01)] 13 Claims
OG exemplary drawing
 
1. Alignment apparatus for aligning a lens module with respect to an image sensor, the alignment apparatus comprising:
a holographic film including a test chart pattern from which a virtual image of the test chart pattern may be generated;
a light source for illuminating the holographic film;
an image sensor holder for mounting the image sensor;
a lens module holder configured and positioned for mounting the lens module between the holographic film and the image sensor such that the virtual image of the test chart pattern is viewable by the image sensor through the lens module;
wherein the virtual image viewable by the image sensor through the lens module is located at a virtual distance from the image sensor that is different from a physical position of the holographic film for aligning the lens module with respect to the image sensor.