US-12619085-B2 - Optical system

Abstract

An optical system includes a sensing assembly and a processing circuit. The sensing assembly is configured to sense light and output a sensing signal accordingly. The processing circuit is configured to analyze the sensing signal. The processing circuit is configured to output a main judgment signal to an external circuit according to the sensing signal.

Inventors

• Chih-Wei Weng
• Yung-Hsien YEH

Assignees

• ACTUTEK CORPORATION

Dates

Publication Date

20260505

Application Date

20230915

Claims (18)

1. 1 . An optical system, comprising: a sensing assembly configured to sense a light beam and output a sensing signal accordingly, wherein the sensing signal comprises a first sensing signal, and the sensing assembly periodically outputs the first sensing signal at a first interval according to the light beam; an optical element, wherein the light beam passes through the optical element and is received by the sensing assembly; a driving assembly, configured to drive the optical element to move so as to change characteristics of the light beam incident on the sensing assembly; and a processing circuit, configured to analyze the sensing signal, wherein the processing circuit is configured to output a main judgment signal to an external circuit according to the sensing signal.
2. 2 . The optical system as claimed in claim 1 , wherein the first interval is less than 0.1 seconds.
3. 3 . The optical system as claimed in claim 2 , wherein; the processing circuit is configured to determine whether there is a difference between the first sensing signals that are adjacent but at different time points; the processing circuit is configured to determine whether there is a difference in the first sensing signal of a first time point, a second time point and a third time point; an interval between the first time point and the second time point is equal to the first interval; and an interval between the second time point and the third time point is equal to the first interval.
4. 4 . The optical system as claimed in claim 3 , wherein when the processing circuit determines that there is a difference in the first sensing signal from the first time point to the third time point, an enable signal is output.
5. 5 . The optical system as claimed in claim 4 , wherein: the driving assembly is configured to change a state of the optical element so that there is a difference in the first sensing signal at different time points; the driving assembly changes the state of the optical element so that the first sensing signal at different time points has a trigger signal; and the processing circuit is configured to output the enable signal according to the trigger signal.
6. 6 . The optical system as claimed in claim 5 , wherein: the sensing signal further comprises a second sensing signal; and the sensing assembly outputs the second sensing signal to the processing circuit according to the enable signal.
7. 7 . The optical system as claimed in claim 6 , wherein: the driving assembly is configured to periodically change the state of the optical element at a second interval to generate a difference in the first sensing signal; the first interval is different from the second interval; the first interval is less than the second interval; and the second interval is less than five minutes.
8. 8 . The optical system as claimed in claim 7 , wherein: the processing circuit is configured to determine whether there is a difference in the second sensing signals that are adjacent but at different time points; the processing circuit is configured to determine whether there is a difference in the second sensing signal at a fourth time point and a fifth time point; and an interval between the fourth time point and the fifth time point is equal to the second interval.
9. 9 . The optical system as claimed in claim 8 , wherein when the processing circuit determines that there is a difference between the second sensing signals that are adjacent but at different time points, the processing circuit outputs the main judgment signal.
10. 10 . The optical system as claimed in claim 9 , wherein: the processing circuit comprises a first frame buffer configured to receive the first sensing signal; the processing circuit further comprises a second frame buffer configured to receive the second sensing signal; a capacity of the first frame buffer is different from a capacity of the second frame buffer; and the capacity of the first frame buffer is greater than the capacity of the second frame buffer.
11. 11 . The optical system as claimed in claim 10 , wherein: the processing circuit further comprises a comparator; the comparator is configured to receive the first sensing signals and determine whether there is a difference between the first sensing signals that are adjacent but at different time points, so as to output the enable signal; and the comparator is configured to receive the second sensing signals and determine whether there is a difference between the second sensing signals that are adjacent but at different time points, so as to output the main judgment signal.
12. 12 . The optical system as claimed in claim 11 , wherein: the sensing assembly comprises a first sensing unit configured to output the first sensing signal according to the light beam; and the sensing assembly comprises a second sensing unit configured to output the second sensing signal according to the light beam.
13. 13 . The optical system as claimed in claim 12 , wherein: the first sensing unit has a plurality of first base units; the second sensing unit has a plurality of second base units; the first base units and the second base units are arranged in different ways; and a number of the first base units is different from a number of the second base units.
14. 14 . The optical system as claimed in claim 13 , wherein: after the optical system completes a startup process, the first sensing unit remains in an activated state; when the first sensing unit remains in the activated state, the first sensing unit continues to receive the light beam and correspondingly outputs the first sensing signal to the first frame buffer; and after the optical system completes the startup process, if the sensing assembly does not receive the enable signal, the second sensing unit remains in a deactivated state.
15. 15 . The optical system as claimed in claim 14 , wherein; the first sensing unit is included in the second sensing unit; the sensing assembly has a plate-shaped structure; and when viewed in a direction parallel to the sensing assembly, the first base unit overlaps at least a portion of the second base unit.
16. 16 . The optical system as claimed in claim 13 , wherein: the sensing assembly has a plate-shaped structure; the first sensing unit is included in the second sensing unit; and when viewed in a direction perpendicular to the sensing assembly, the first base unit overlaps at least a portion of the second base unit.
17. 17 . The optical system as claimed in claim 16 , wherein; the sensing assembly has a filter layer, an electronic circuit layer and a photosensitive layer; when viewed in a direction perpendicular to the sensing assembly, the filter layer overlaps the electronic circuit layer and the photosensitive layer.
18. 18 . The optical system as claimed in claim 17 , wherein; the first base unit has a first photosensitive element which is disposed in the electronic circuit layer; the second base unit has at least one second photosensitive element; and when viewed in a direction perpendicular to the sensing assembly, the first photosensitive element overlaps a portion of the at least one second photosensitive element.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application No. 63/406,916, filed Sep. 15, 2022, the entirety of which is incorporated by reference herein. BACKGROUND OF THE INVENTION Field of the Disclosure The present disclosure relates to an optical system, and in particular it relates to an optical system having a monitoring function. Description of the Related Art As technology has developed, it has become more common to include image-capturing and video-recording functions into many types of modern electronic devices, such as smartphones and digital cameras. These electronic devices are used more and more often, and new models have been developed that are convenient, thin, and lightweight, offering more choice for consumers. BRIEF SUMMARY OF THE INVENTION According to some embodiments of the disclosure, an optical system is provided and includes a sensing assembly and a processing circuit. The sensing assembly is configured to sense a light beam and output a sensing signal accordingly. The processing circuit is configured to analyze the sensing signal. The processing circuit is configured to output a main judgment signal to an external circuit according to the sensing signal. According to some embodiments, the optical system further includes a driving assembly and an optical element. The light beam passes through the optical element and is received by the sensing assembly. The driving assembly is configured to drive the optical element to move so as to change the characteristics of the light beam incident on the sensing assembly. According to some embodiments, the sensing signal includes a first sensing signal. The sensing assembly periodically outputs the first sensing signal at a first interval according to the light beam. According to some embodiments, the first interval is less than 0.1 seconds. According to some embodiments, the processing circuit is configured to determine whether there is a difference between the first sensing signals that are adjacent but at different time points. The processing circuit is configured to determine whether there is a difference in the first sensing signal of a first time point, a second time point and a third time point. The interval between the first time point and the second time point is equal to the first interval. The interval between the second time point and the third time point is equal to the first interval. According to some embodiments, when the processing circuit determines that there is a difference in the first sensing signal from the first time point to the third time point, an enable signal is output. According to some embodiments, the driving assembly is configured to change the state of the optical element so that there is a difference in the first sensing signal at different time points. The driving assembly changes the state of the optical element so that the first sensing signal at different time points has a trigger signal. The processing circuit is configured to output the enable signal according to the trigger signal. According to some embodiments, the sensing signal further includes a second sensing signal. The sensing assembly outputs the second sensing signal to the processing circuit according to the enable signal. According to some embodiments, the driving assembly is configured to periodically change the state of the optical element at a second interval to generate a difference in the first sensing signal. The first interval is different from the second interval. The first interval is less than the second interval. The second interval is less than five minutes. According to some embodiments, the processing circuit is configured to determine whether there is a difference in the second sensing signals that are adjacent but at different time points. The processing circuit is configured to determine whether there is a difference in the second sensing signal at a fourth time point and a fifth time point. The interval between the fourth time point and the fifth time point is equal to the second interval. According to some embodiments, when the processing circuit determines that there is a difference between the second sensing signals that are adjacent but at different time points, the processing circuit outputs the main judgment signal. According to some embodiments, the processing circuit includes a first frame buffer configured to receive the first sensing signal. The processing circuit further includes a second frame buffer configured to receive the second sensing signal. A capacity of the first frame buffer is different from a capacity of the second frame buffer. The capacity of the first frame buffer is greater than the capacity of the second frame buffer. According to some embodiments, the processing circuit further includes a comparator. The comparator is configured to receive the first sensing signals and determine whether there is a difference between the first sensing signals that