Optical system and method for compensating for hand-shake

Abstract

The present disclosure provides an optical system and a method for compensating hand-shake. The optical system includes a fixed unit, a driving unit and a lens unit. The driving unit is connected to the fixed unit. The lens unit is adapted to be driven by the driving unit to move relative to the fixed unit.

Description

Technical Field

[0001] Embodiments of the present invention relate to an optical system, and more particularly to an optical system with anti-shake function. Background Technology

[0002] In known optical image stabilization (OIS) systems, optical compensation is primarily provided by moving the lens unit to improve focusing. However, since the optical path is still substantially altered after the lens unit is moved, this often results in a deterioration in image quality. Specifically, in known technologies, using center compensation for image stabilization leads to poorer image quality in the peripheral areas of the image, while using peripheral compensation leads to poorer image quality in the center.

[0003] To overcome the aforementioned shortcomings, known technologies employ center compensation for image stabilization and increase the size of the lens unit, thereby improving image quality. However, this approach increases the size and cost of the lens unit and its surrounding components, hindering the pursuit of thinner and lower-cost manufacturing. Summary of the Invention

[0004] An embodiment of the present invention provides an optical system to address problems in the prior art, comprising a fixed unit, a driving unit, and a lens unit. The driving unit is connected to the fixed unit. The lens unit is adapted to be driven by the driving unit to move relative to the fixed unit.

[0005] In one embodiment, the optical system further includes a superlens, wherein the superlens moves relative to the lens unit between a first position and a second position. When the superlens is in the first position, the superlens is not in the optical path of the lens unit, and when the superlens is in the second position, the superlens is in the optical path of the lens unit.

[0006] In one embodiment, the superlens moves between the first position and the second position by rotation.

[0007] In one embodiment, the optical system further includes an actuation unit connected to the meta lens, the actuation unit being adapted to rotate the meta lens between the first position and the second position.

[0008] In one embodiment, the actuation unit includes a magnetic element and an actuation coil. The superlens is connected to the magnetic element, and the actuation coil is adapted to apply a magnetic field to the magnetic element. The magnetic element drives the superlens to move between the first position and the second position.

[0009] In one embodiment, the lens unit includes a light-inlet side, which is directly opposite the light-inlet side when the superlens is in the second position.

[0010] In one embodiment, the lens unit includes a light-emitting side, which is directly facing the light-emitting side when the meta-lens is in the second position.

[0011] In one embodiment, the optical system further includes an image sensor, wherein when the meta lens is in the second position, the meta lens is located between the image sensor and the lens unit.

[0012] In one embodiment, the optical system further includes a detection unit and a central processing unit, wherein the detection unit is adapted to detect a hand tremor and provide a sensing signal, the central processing unit activates the drive unit based on the sensing signal to move the lens unit for optical compensation, and at the same time, the central processing unit controls the action unit to move the super-lens from the first position to the second position.

[0013] In one embodiment, the optical system further includes a meta-lens, wherein the meta-lens is adapted to be disposed on the optical path of the lens unit, the meta-lens including a central region, a peripheral region and a plurality of microstructures, the peripheral region surrounding the central region, and the plurality of microstructures being located only in the central region or the peripheral region.

[0014] In one embodiment, the driving unit drives the lens unit to perform anti-shake optical compensation in a center-compensated manner, with the plurality of microstructures located only in the peripheral region.

[0015] In one embodiment, the peripheral region includes a first annular region and a second annular region. The first annular region surrounds the central region, and the second annular region surrounds the first annular region. The plurality of microstructures include a plurality of first microstructures and a plurality of second microstructures. The plurality of first microstructures are located in the first annular region, and the plurality of second microstructures are located in the second annular region. The optical compensation effect of the plurality of first microstructures is different from the optical compensation effect of the plurality of second microstructures.

[0016] In one embodiment, the height of each first microstructure is equal to the height of each second microstructure.

[0017] In one embodiment, the width of each first microstructure is smaller than the width of each second microstructure.

[0018] In one embodiment, the arrangement density of the plurality of first microstructures is less than the arrangement density of the plurality of second microstructures.

[0019] In one embodiment, the driving unit drives the lens unit to perform anti-shake optical compensation in a peripheral compensation manner, with the plurality of microstructures located only in the central region.

[0020] In one embodiment, the diameter of the central region is 2 / 5 of the length of one diagonal of the superlens.

[0021] In another embodiment, the present invention provides a hand shatter compensation method, comprising the following steps. First, an optical system is provided, comprising a fixed unit, a driving unit, a lens unit, a meta-lens, a detection unit, an actuation unit, and a central processing unit. The driving unit is connected to the fixed unit, and the lens unit is adapted to be driven by the driving unit to move relative to the fixed unit. Next, the detection unit detects a hand shatter condition and provides a sensing signal. Then, the central processing unit activates the driving unit based on the sensing signal to move the lens unit for optical compensation. Simultaneously, the central processing unit controls the actuation unit to move the meta-lens into the optical path of the lens unit.

[0022] In one embodiment, the anti-shake compensation method further includes the following steps: activating an anti-shake mode and detecting the hand shake condition using the detection unit.

[0023] In one embodiment, in the anti-shake mode, the driving unit is adapted to drive the lens unit to perform anti-shake optical compensation in a center-compensated manner. The super-lens includes a central region, a peripheral region, and a plurality of microstructures. The peripheral region surrounds the central region, and the plurality of microstructures are located only within the peripheral region.

[0024] In the optical system of this invention, a meta-lens is employed to provide diffraction compensation, improving image quality through anti-shake optical compensation. Specifically, when the central processing unit (CPU) determines that the hand shake is too severe and compensation is necessary, the CPU moves the lens unit for optical compensation and simultaneously moves the meta-lens into the optical path of the lens unit to provide scattering compensation, thereby achieving good image quality. Conversely, when the CPU determines that the hand shake is minor or nonexistent and compensation is not required, the meta-lens remains outside the optical path of the lens unit to avoid affecting image quality. Applying the optical system of this invention can reduce the size and cost of the lens unit and its surrounding components, achieving the goals of thinner and lighter designs and lower production costs. Attached Figure Description

[0025] Figure 1A This is a perspective view of the optical system according to the first embodiment of the present invention.

[0026] Figure 1B This is a cross-sectional view of the optical system according to the first embodiment of the present invention.

[0027] Figure 2A This is the case where the optical system of the second embodiment of the present invention is equipped with a meta-lens, wherein the meta-lens is in the first position.

[0028] Figure 2B This is the case where the optical system of the second embodiment of the present invention is equipped with a meta-lens, wherein the meta-lens is in a second position.

[0029] Figure 3A This is an exploded view of the action unit in an embodiment of the present invention.

[0030] Figure 3B This is a diagram showing the combination of action units in an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the optical system according to the third embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the optical system according to the fourth embodiment of the present invention.

[0033] Figure 6 This is a system block diagram of the optical system according to an embodiment of the present invention.

[0034] Figure 7 This is a detailed structure of the superlens in an embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of a super-lens according to another embodiment of the present invention.

[0036] Figure 9 This is an embodiment of the anti-shake compensation method of the present invention.

[0037] The attached figures are labeled as follows:

[0038] L1, L2, L3, L4: Optical systems

[0039] 1: Fixed Unit

[0040] 2: Drive Unit

[0041] 21: Magnetic components

[0042] 22: Coil

[0043] 3: Lens Unit

[0044] 301: Light-inlet side

[0045] 302: Light-emitting side

[0046] 4, 4', 401, 402: Superlenses

[0047] 41: Central Area

[0048] 42: Surrounding Area

[0049] 421: First Ring-shaped Zone

[0050] 422: Second Ring Area

[0051] 43: Microstructure

[0052] 431: First microstructure

[0053] 432: Second microstructure

[0054] 5: Action Unit

[0055] 51: Magnetic components

[0056] 52: Action coil

[0057] 53: Base

[0058] 54: Support plate

[0059] 55: Cover plate

[0060] 61: Infrared filter

[0061] 62: Image Sensor

[0062] 63: Detection Unit

[0063] 64: Central Processing Unit

[0064] φ1: Diagonal length

[0065] φ2: diameter

[0066] S1, S2, S21, S3, S4: Steps Detailed Implementation

[0067] Figure 1A This is a perspective view of the optical system according to the first embodiment of the present invention. Figure 1B This is a cross-sectional view of the optical system according to the first embodiment of the present invention. (See also: [reference]) Figure 1A and Figure 1B The optical system L1 of the first embodiment of the present invention includes a fixed unit 1, a driving unit 2, and a lens unit 3. The driving unit 2 is connected to the fixed unit 1. The lens unit 3 is adapted to be driven by the driving unit 2 to move relative to the fixed unit 1.

[0068] In embodiments of the present invention, the fixing unit 1 may include components such as a housing and a base. The driving unit 2 may include components such as a coil, a magnetic element, and an elastic element. In one embodiment, the optical system L1 provides optical image stabilization (OIS) functionality. The above disclosure does not disclose the present invention.

[0069] Figure 2A This is the case where the optical system of the second embodiment of the present invention is equipped with a meta-lens, wherein the meta-lens is in the first position. Figure 2B This describes the case where the optical system of the second embodiment of the present invention is equipped with a meta-lens, wherein the meta-lens is in a second position. (See reference for matching.) Figure 2A and Figure 2B In one embodiment, the optical system L2 further includes a metalen 4, wherein the metalen 4 is positioned relative to the lens unit 3 at a first position ( Figure 2A ) and a second position ( Figure 2B The superlens 4 moves between these positions. When the superlens 4 is in the first position ( Figure 2A When the superlens 4 is in the second position, it is not in the optical path of the lens unit. Figure 2B When the super-lens 4 is located above the optical path of the lens unit 3, the super-lens 4 is positioned above the optical path of the lens unit 3.

[0070] Matching reference Figure 2A and Figure 2B In one embodiment, the superlens 4 moves between the first position and the second position by rotation.

[0071] Matching reference Figure 2A and Figure 2B In one embodiment, the optical system L2 further includes an action unit 5, the superlens 4 is connected to the action unit 5, and the action unit 5 is adapted to move the superlens 4 in a rotatable manner between the first position and the second position.

[0072] Figure 3A This is an exploded view of the action unit in an embodiment of the present invention. Figure 3B This is a diagram illustrating the combination of action units according to an embodiment of the present invention. (See attached reference.) Figure 3A and Figure 3B In one embodiment, the action unit 5 includes a magnetic element 51 and an action coil 52. The superlens 4 is connected to the magnetic element 51, and the action coil 52 is adapted to apply a magnetic field to the magnetic element 51. The magnetic element 51 drives the superlens 4 to move between the first position and the second position.

[0073] Matching reference Figure 3A and Figure 3B In one embodiment, the actuation unit 5 further includes a base 53, a support plate 54, and a cover plate 55. The actuation coil 52 is fixed to the base 53, the support plate 54 and the cover plate 55 are fixed to the base 53, the magnetic element 51 is pivotally connected to the base 53, and the super-lens 4 is at least partially sandwiched between the support plate 54 and the cover plate 55.

[0074] Figure 4This is a schematic diagram of the optical system according to a third embodiment of the present invention. (Refer to...) Figure 4 The optical system L3 of the third embodiment of the present invention includes a driving unit 2 and a lens unit 3. The driving unit 2 includes a magnetic element 21 and a coil 22. In this embodiment, the optical system L3 also includes an infrared filter 61 and an image sensor 62. The lens unit 3 includes a light-incoming side 301. When the metalens 4 is in the second position, the metalens 4 is directly facing the light-incoming side 301.

[0075] Matching reference Figure 2A , Figure 2B as well as Figure 4 In the second and third embodiments of the present invention, the superlens 4 is adapted to face the light-incident side 301 to provide a diffraction compensation effect and improve the image quality of the anti-shake optical compensation. In this embodiment, generally speaking, since the aperture of the lens unit 3 on the light-incident side 301 is small, the size of the superlens 4 can be small.

[0076] Figure 5 This is a schematic diagram of the optical system according to the fourth embodiment of the present invention. (Refer to...) Figure 5 In this embodiment, the lens unit 3 of the optical system L4 includes a light-emitting side 302. When the metalens 4' is in the second position, the metalens 4' is directly facing the light-emitting side 302. When the metalens 4' is in the second position, it is located between the image sensor 62 and the lens unit 3; specifically, it is located between the infrared filter 61 and the lens unit 3. In this embodiment, the metalens 4' is adapted to be directly facing the light-emitting side 302 to provide diffraction compensation and improve the image quality of the anti-shake optical compensation. In this embodiment, generally, since the aperture of the lens unit 3 on the light-incident side 302 is large, the size of the metalens 4' can be large.

[0077] Figure 6 This is a system block diagram of the optical system according to an embodiment of the present invention. (Refer to...) Figure 6 In one embodiment, the optical system further includes a detection unit 63 and a central processing unit 64. The detection unit 63 is adapted to detect a hand tremor and provide a sensing signal. The central processing unit 64 activates the drive unit 2 based on the sensing signal to move the lens unit for optical compensation. Simultaneously, the central processing unit 64 controls the action unit 5 to move the superlens from the first position to the second position. In one embodiment, the detection unit may include a gyroscope.

[0078] Figure 7 This is a detailed structure of the superlens according to an embodiment of the present invention. (Refer to...) Figure 7The meta-lens 401 includes a central region 41, a peripheral region 42, and a plurality of microstructures 43. The peripheral region 42 surrounds the central region 41, and the plurality of microstructures 43 are located only within the central region 41 or the peripheral region 42. In one embodiment, the peripheral region 42 refers to all areas surrounding the central region 41, and the above disclosure does not limit the invention. In this embodiment, the plurality of microstructures 43 are located only within the peripheral region 42.

[0079] Matching reference Figure 4 and Figure 7 In one embodiment, the driving unit 2 drives the lens unit 3 to perform anti-shake optical compensation in a center-compensated manner. Meanwhile, multiple microstructures 43 are located only within the peripheral region 42 to provide diffraction compensation, thereby improving the image quality of the anti-shake optical compensation.

[0080] Reference Figure 7 In one embodiment, the peripheral region 42 includes a first annular region 421 and a second annular region 422. The first annular region 421 surrounds the central region 41, and the second annular region 422 surrounds the first annular region 421. The plurality of microstructures 43 include a plurality of first microstructures 431 and a plurality of second microstructures 432. The plurality of first microstructures 431 are located in the first annular region 421, and the plurality of second microstructures 432 are located in the second annular region 422. The optical compensation effect of the plurality of first microstructures 431 is different from the optical compensation effect of the plurality of second microstructures 432.

[0081] Reference Figure 7 In one embodiment, the plurality of microstructures 43 are cylindrical. However, the foregoing disclosure does not limit the invention. For example, in other embodiments, the plurality of microstructures 43 may also be blocky, pyramidal, or other shapes.

[0082] Reference Figure 7 In one embodiment, the height of each first microstructure 431 is equal to the height of each second microstructure 432. Furthermore, the width (diameter in this embodiment) of each first microstructure 431 is smaller than the width of each second microstructure 432. Therefore, the optical compensation effect of the plurality of first microstructures 431 differs from the optical compensation effect of the plurality of second microstructures 432. However, the above disclosure does not limit the invention. For example, in another embodiment, the arrangement density of the plurality of first microstructures is less than the arrangement density of the plurality of second microstructures, thereby also achieving a situation where the optical compensation effect of the plurality of first microstructures 431 differs from the optical compensation effect of the plurality of second microstructures 432.

[0083] Figure 8 This is a schematic diagram of a superlens according to another embodiment of the present invention. (Refer to...) Figure 8In another embodiment, the driving unit can also drive the lens unit to perform anti-shake optical compensation in a peripheral compensation manner. In this embodiment, the multiple microstructures 43 of the super-lens 402 are located only in the central region 41.

[0084] Reference Figure 7 In one embodiment, the diameter φ2 of the central region 41 is 2 / 5 of the diagonal length φ1 of the metalens. The above disclosure does not limit the invention; in another embodiment, the diameter φ2 of the central region 41 can be 1 / 5 to 3 / 5 of the diagonal length φ1 of the metalens.

[0085] Figure 9 This is an embodiment of the hand-shake compensation method of the present invention. (Refer to...) Figure 9 The anti-shake compensation method of this invention includes the following steps. First, an optical system is provided, including a fixed unit, a driving unit, a lens unit, a meta-lens, a detection unit, an action unit, and a central processing unit. The driving unit is connected to the fixed unit, and the lens unit is adapted to be driven by the driving unit to move relative to the fixed unit (S1). Next, the detection unit detects a hand shake condition and provides a sensing signal (S2). Then, the central processing unit activates the driving unit according to the sensing signal to move the lens unit for optical compensation. At the same time, the central processing unit controls the action unit to move the meta-lens into the optical path of the lens unit (S3).

[0086] Reference Figure 9 In one embodiment, the image stabilization compensation method further includes the following steps: activating an image stabilization mode and detecting the image stabilization condition using the detection unit (S21). Specifically, during dynamic shooting, the user can activate the image stabilization mode and detect the image stabilization condition using the detection unit. During static shooting, the user can also deactivate the image stabilization mode.

[0087] In the optical system of this invention, a meta-lens is employed to provide diffraction compensation, improving image quality through anti-shake optical compensation. Specifically, when the central processing unit (CPU) determines that the hand shake is too severe and compensation is necessary, the CPU moves the lens unit for optical compensation and simultaneously moves the meta-lens into the optical path of the lens unit to provide scattering compensation, thereby achieving good image quality. Conversely, when the CPU determines that the hand shake is minor or nonexistent and compensation is not required, the meta-lens remains outside the optical path of the lens unit to avoid affecting image quality. Applying the optical system of this invention can reduce the size and cost of the lens unit and its surrounding components, achieving the goals of thinner and lighter designs and lower production costs.

[0088] Although the present invention has been disclosed above with reference to specific preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical system, comprising: A fixed unit; A drive unit is connected to the fixed 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 meta lens, wherein the meta lens moves relative to the lens unit between a first position and a second position. When the meta lens is in the first position, the meta lens is not in the optical path of the lens unit. When the meta lens is in the second position, the meta lens is in the optical path of the lens unit. The meta lens includes multiple microstructures, and the multiple microstructures are located only in a local area of ​​the meta lens.

2. The optical system as claimed in claim 1, wherein, The super-lens moves between the first position and the second position by rotation.

3. The optical system of claim 2, further comprising an actuation unit, the superlens being connected to the actuation unit, the actuation unit being adapted to move the superlens in a rotatable manner between the first position and the second position.

4. The optical system as claimed in claim 3, wherein, The actuation unit includes a magnetic element and an actuation coil. The superlens is connected to the magnetic element, and the actuation coil is adapted to apply a magnetic field to the magnetic element. The magnetic element drives the superlens to move between the first position and the second position.

5. The optical system as claimed in claim 1, wherein, The lens unit includes a light-inlet side, which is directly opposite the light-inlet side when the super-lens is in the second position.

6. The optical system of claim 1, wherein, The lens unit includes a light-emitting side, which is directly opposite the light-emitting side when the superlens is in the second position.

7. The optical system of claim 6, further comprising an image sensor, wherein, When the superlens is in the second position, the superlens is located between the image sensor and the lens unit.

8. The optical system of claim 1, further comprising an action unit, a detection unit, and a central processing unit, wherein, The super lens is connected to the action unit. The detection unit is adapted to detect a hand tremor and provide a sensing signal. The central processing unit activates the drive unit based on the sensing signal to move the lens unit for optical compensation. At the same time, the central processing unit controls the action unit and moves the super lens from the first position to the second position.

9. The optical system of claim 1, wherein, The driving unit drives the lens unit to perform anti-shake optical compensation in a center-compensated manner. The super-lens includes a central region and a peripheral region, the peripheral region surrounding the central region, and multiple microstructures located only in the peripheral region.

10. The optical system of claim 9, wherein, The surrounding area includes a first annular region and a second annular region. The first annular region surrounds the central region, and the second annular region surrounds the first annular region. The plurality of microstructures include a plurality of first microstructures and a plurality of second microstructures. The plurality of first microstructures are located in the first annular region, and the plurality of second microstructures are located in the second annular region. The optical compensation effect of the plurality of first microstructures is different from the optical compensation effect of the plurality of second microstructures.

11. The optical system of claim 10, wherein, The height of each first microstructure is equal to the height of each second microstructure.

12. The optical system of claim 11, wherein, The width of each first microstructure is smaller than the width of each second microstructure.

13. The optical system of claim 10, wherein, The arrangement density of the first microstructures is less than the arrangement density of the second microstructures.

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 super-lens includes a central region and a peripheral region, the peripheral region surrounding the central region, and multiple microstructures located only in the central region.

15. The optical system of claim 14, wherein, The diameter of the central region is 2 / 5 of the length of one diagonal of the superlens.

16. A method for compensating for hand shake, comprising: An optical system is provided, including a fixed unit, a driving unit, a lens unit, a super-lens, a detection unit, an action unit, and a central processing unit. The driving unit is connected to the fixed unit, and the lens unit is adapted to be driven by the driving unit to move relative to the fixed unit. The detection unit detects hand tremors and provides a sensing signal. The central processing unit activates the driving unit based on the sensing signal to move the lens unit for optical compensation. At the same time, the central processing unit controls the action unit to move the super-lens onto the optical path of the lens unit. An anti-shake mode is activated, and the detection unit detects the hand shake condition. In the anti-shake mode, the driving unit is adapted to drive the lens unit to perform anti-shake optical compensation in a center-compensated manner. The super-lens includes a central region, a peripheral region, and multiple microstructures. The peripheral region surrounds the central region, and the multiple microstructures are located only within the peripheral region.

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