CN-115145047-B - Optical system and hand vibration prevention compensation method thereof

Abstract

The disclosure provides an optical system and a hand shake prevention compensation method thereof. The optical system comprises a fixed unit, a driving unit and a lens unit. The driving unit is connected with the fixing unit. The lens unit is suitable for being driven by the driving unit to move relative to the fixed unit.

Inventors

• WENG ZHIWEI
• HU CHAOZHANG
• Ye Yongxian
• XU MAOGUO

Assignees

• 台湾东电化股份有限公司

Dates

Publication Date

20260508

Application Date

20220329

Priority Date

20210329

Claims (16)

1. 1. An optical system, comprising: A fixing unit; a driving unit connected with the fixing unit; a lens unit, wherein the lens unit is adapted to be driven by the driving unit to move relative to the fixed unit, and A metalens, wherein the metalens moves between a first position and a second position relative to the lens unit, the metalens not being in the optical path of the lens unit when the metalens is in the first position, the metalens being in the optical path of the lens unit when the metalens is in the second position, the metalens comprising a plurality of microstructures, the plurality of microstructures being located only in a localized region of the metalens.
2. 2. The optical system of claim 1, wherein the metalens is rotationally movable between the first position and the second position.
3. 3. The optical system of claim 2, further comprising an actuation unit coupled to the actuation unit, the actuation unit adapted to rotationally move the metamaterial lens between the first position and the second position.
4. 4. The optical system of claim 3, wherein the actuation unit comprises a magnetic element and an actuation coil, the metamaterial lens being coupled to the magnetic element, the actuation coil being adapted to apply a magnetic field to the magnetic element, the magnetic element moving the metamaterial lens between the first position and the second position.
5. 5. The optical system of claim 1, wherein the lens unit comprises a light entry side, the metalens facing the light entry side when the metalens is in the second position.
6. 6. The optical system of claim 1, wherein the lens unit comprises a light exit side, the metalens facing the light exit side when the metalens is in the second position.
7. 7. The optical system of claim 6, further comprising an image sensor, wherein the metalens is positioned between the image sensor and the lens unit when the metalens is in the second position.
8. 8. The optical system of claim 1, further comprising an action unit, a detection unit and a central processing unit, wherein the metalens is connected with the action unit, the detection unit is suitable for detecting a hand shake condition to provide a sensing signal, the central processing unit starts the driving unit according to the sensing signal to move the lens unit for optical compensation, and meanwhile, the central processing unit controls the action unit and enables the metalens to move from the first position to the second position.
9. 9. The optical system of claim 1, wherein the driving unit drives the lens unit to perform the anti-shake optical compensation in a center compensation manner, the metalens includes a center region and a peripheral region surrounding the center region, and the microstructures are only located in the peripheral region.
10. 10. The optical system of claim 9, wherein the peripheral region comprises a first annular region surrounding the central region and a second annular region surrounding the first annular region, the microstructures comprise a plurality of first microstructures and a plurality of second microstructures, the first microstructures are located in the first annular region, the second microstructures are located in the second annular region, and the optical compensation effect of the first microstructures is different from the optical compensation effect of the second microstructures.
11. 11. The optical system of claim 10, wherein the height of each first microstructure is equal to the height of each second microstructure.
12. 12. The optical system of claim 11, wherein the width of each first microstructure is less than the width of each second microstructure.
13. 13. The optical system of claim 10, wherein an arrangement density of the plurality of first microstructures is less than an arrangement density of the plurality of second microstructures.
14. 14. The optical system of claim 1, wherein the driving unit drives the lens unit to perform anti-shake optical compensation in a peripheral compensation manner, the metalens comprising a central region and a peripheral region surrounding the central region, the microstructures being located only in the central region.
15. 15. The optical system of claim 14, wherein the diameter of the central region is 2/5 of a diagonal length of the metalens.
16. 16. A hand shake prevention compensation method comprises the following steps of; an optical system is provided, which comprises a fixed unit, a driving unit, a lens unit, a metalens, a detection unit, an action unit and a central processing unit, wherein the driving unit is connected with the fixed unit, and the lens unit is suitable for being driven by the driving unit to move relative to the fixed unit; the detecting unit is used for detecting a hand shake condition to provide a sensing signal; the central processing unit starts the driving unit according to the sensing signal to move the lens unit for optical compensation, and meanwhile, the central processing unit controls the action unit and enables the metalens to move onto the optical path of the lens unit; And starting a hand vibration prevention mode, and detecting the hand vibration condition by using the detection unit, wherein under the hand vibration prevention mode, the driving unit is suitable for driving the lens unit to perform hand vibration prevention optical compensation in a center compensation mode, the metalens comprises a center region, a peripheral region and a plurality of microstructures, the peripheral region surrounds the center region, and the microstructures are only positioned in the peripheral region.

Description

Optical system and hand vibration prevention compensation method thereof Technical Field Embodiments of the present invention relate to an optical system, and more particularly, to an optical system with a hand shake prevention function. Background In a known optical system having an optical anti-shake (OIS) function, optical compensation is mainly provided by moving a lens unit to improve a focusing effect. However, the optical path is substantially changed after the lens unit is moved, and the imaging effect of the image may be deteriorated. Specifically, in the prior art, if the center compensation is adopted to perform the anti-shake optical compensation, the imaging effect of the peripheral portion of the image is poor. If the peripheral compensation mode is adopted to perform the anti-shake optical compensation, the imaging effect of the central part of the image is poor. To overcome the above-mentioned drawbacks, the known art adopts a center compensation method to perform anti-shake optical compensation and increases the size of the lens unit, thereby improving the imaging effect of the image. However, this increases the size and cost of the lens unit and its peripheral components, which is disadvantageous for light and thin and low cost production. Disclosure of Invention The embodiment of the invention provides an optical system for solving the problems of the prior art, which comprises a fixed unit, a driving unit and a lens unit. The driving unit is connected with the fixing unit. The lens unit is suitable for being driven by the driving unit to move relative to the fixed unit. In one embodiment, the optical system further comprises a metalens, wherein the metalens moves between a first position and a second position relative to the lens unit, the metalens not being in the optical path of the lens unit when the metalens is in the first position, the metalens being in the optical path of the lens unit when the metalens is in the second position. In one embodiment, the metalens is rotationally movable between the first position and the second position. In an embodiment, the optical system further comprises an actuating unit, the metalens being connected to the actuating unit, the actuating unit being adapted to move the metalens between the first position and the second position in a rotational manner. In an embodiment, the action unit comprises a magnetic element and an action coil, the metalens is connected with the magnetic element, the action coil is suitable for applying a magnetic field to the magnetic element, and the magnetic element drives the metalens to move between the first position and the second position. In one embodiment, the lens unit includes a light entrance side, and the metalens faces the light entrance side when the metalens is in the second position. In one embodiment, the lens unit includes a light exit side, and the metalens faces the light exit side when the metalens is in the second position. In one embodiment, the optical system further comprises an image sensor, wherein the metalens is located between the image sensor and the lens unit when the metalens is in the second position. In an embodiment, the optical system further includes a detecting unit and a central processing unit, wherein the detecting unit is adapted to detect a hand shake condition to provide a sensing signal, and the central processing unit starts the driving unit according to the sensing signal to move the lens unit for optical compensation, and at the same time, the central processing unit controls the action unit and moves the metalens from the first position to the second position. In an embodiment, the optical system further comprises a metalens, wherein the metalens is adapted to be disposed on the optical path of the lens unit, the metalens comprising a central region, a peripheral region surrounding the central region, and a plurality of microstructures located only in the central region or the peripheral region. In an embodiment, the driving unit drives the lens unit to perform anti-shake optical compensation in a center compensation manner, and the microstructures are only located in the peripheral area. In an embodiment, the peripheral area includes a first annular area surrounding the central area, and a second annular area surrounding the first annular area, and the microstructures include a plurality of first microstructures and a plurality of second microstructures, the first microstructures are located in the first annular area, the second microstructures are located in the second annular area, and an optical compensation effect of the first microstructures is different from an optical compensation effect of the second microstructures. In an embodiment, the height of each first microstructure is equal to the height of each second microstructure. In one embodiment, the width of each first microstructure is smaller than the width of each second microstructure. In an embodiment, the arr