Apparatus and method for imaging lens alignment using a virtual test image
US11695915B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2022 |
| Grant date | Jul 4, 2023 |
| Priority date | — |
| Expiry date | Feb 15, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/221
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An alignment apparatus for aligning a lens module with respect to an image sensor includes a holographic film including a test chart pattern from which a virtual image of the test chart pattern may be generated, and a light source for illuminating the holographic film. An image sensor holder is provided for mounting the image sensor and a lens module holder is 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. The virtual image thus 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.