Method and photo sensor assembly for sensing rotational positions of a camera module, and surveillance camera having the assembly
US11689806B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2021 |
| Grant date | Jun 27, 2023 |
| Priority date | — |
| Expiry date | Aug 24, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/704
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A photo sensor assembly may include: a rotator configured to rotate together with a camera module; a plurality of first photo interrupter bars disposed at a same interval along a first circumference on the rotator; a second photo interrupter bar disposed at a second circumference on the rotator; a first photo sensor disposed closer to the first circumference than to the second circumference, and configured to detect a first light-blocking pattern generated from the plurality of first photo interrupter bars; a second photo sensor disposed closer to the second circumference than to the first circumference, and configured to detect a second light-blocking pattern generated from the second photo interrupter bar; and a processor configured to estimate an initial position of the rotator based on the second light-blocking pattern and estimate a rotational angle from the initial position of the rotator based on the detected first light-blocking pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.