Optical system

Abstract

This disclosure discloses an optical system. The optical system includes a movable part, a fixed part, a first sensing element, a second sensing element, and a control unit. An optical element is disposed on the movable part, and the first and second sensing elements are respectively used to sense the movement of the movable part relative to the fixed part in a first and a second dimension coordinate, and respectively generate first and second sensing values. The control unit generates an error value based on the first sensing value and an error relationship curve, and the control unit corrects the second sensing value based on the error value.

Description

Technical Field

[0001] The present invention relates to an optical system, and more particularly to an optical system having a movable part and a fixed part. Background Technology

[0002] With the development of technology, many electronic devices today (such as laptops or digital cameras) have photography or video recording capabilities. These devices are becoming increasingly common and are evolving towards more convenient and lightweight designs to provide users with more choices.

[0003] In some electronic devices, a lens drive module is configured to move the lens in order to make the focal length of the lens adjustable. In addition, the optical system inside the electronic device usually has multiple corresponding magnetic elements and sensing elements. The magnetic elements are set in a moving part of the optical system, and the sensing elements are set in a fixed part of the optical system to sense the magnetic field strength of the magnetic elements, thereby knowing the positional changes of the aforementioned moving part relative to the fixed part in different dimensional coordinates.

[0004] However, the aforementioned sensing elements are often affected by crosstalk, which can lead to measurement errors. Therefore, solving this problem is an important challenge. Summary of the Invention

[0005] The purpose of this invention is to provide an optical system to solve at least one of the above-mentioned problems.

[0006] In view of the aforementioned known problems, one embodiment of the present invention provides an optical system including a movable part, a fixed part, a driving assembly, a first sensing element, a second sensing element, and a control unit. The movable part is used to connect to an optical element, and the movable part is movable relative to the fixed part. The driving assembly is used to drive the movable part to move relative to the fixed part. The first sensing element is used to sense the movement of the movable part relative to the fixed part in a first-dimensional coordinate and generate a first sensing value. The second sensing element is used to sense the movement of the movable part relative to the fixed part in a second-dimensional coordinate and generate a second sensing value.

[0007] The aforementioned control unit is electrically connected to the aforementioned first and second sensing elements, and generates a first error value based on the aforementioned first sensing value and a first error relationship curve. The aforementioned first error relationship curve represents the relationship curve between the aforementioned second sensing value generated by the aforementioned second sensing element and the aforementioned first dimension coordinate when the aforementioned movable part moves only along the aforementioned first dimension coordinate relative to the aforementioned fixed part. The aforementioned control unit corrects the aforementioned second sensing value based on the aforementioned first error value and outputs a drive signal to the aforementioned drive assembly to drive the aforementioned movable part to move relative to the aforementioned fixed part.

[0008] In one embodiment, the aforementioned first error relationship curve is generated by an external calibration device by measuring the positional change of the aforementioned moving part relative to the aforementioned fixed part, and after the aforementioned first error relationship curve is generated, the aforementioned external calibration device is removed from the aforementioned optical system.

[0009] In one embodiment, when the aforementioned external calibration device measures the positional change of the aforementioned movable part relative to the aforementioned fixed part, the aforementioned movable part is fixed at a reference point on the aforementioned second-dimensional coordinate system relative to the aforementioned fixed part.

[0010] In one embodiment, the aforementioned optical system further includes a first magnetic element having a first magnetic pole direction and a second magnetic element having a second magnetic pole direction, wherein the first and second magnetic elements are disposed on the aforementioned movable part, and the first and second sensing elements are disposed on the aforementioned fixed part, for sensing the magnetic field strength of the first and second magnetic elements respectively.

[0011] In one embodiment, the direction of the first magnetic pole is not parallel to the direction of the second magnetic pole.

[0012] In one embodiment, both the first magnetic pole direction and the second magnetic pole direction are perpendicular to an optical axis of the optical element.

[0013] In one embodiment, the direction of the first magnetic pole differs from the direction of the second magnetic pole by 45 degrees.

[0014] In one embodiment, the aforementioned optical system further includes a first magnetic element and a second magnetic element, wherein the first magnetic element has a first magnetic pole direction, wherein the first sensing element senses the magnetic field strength of the first magnetic element in the first magnetic pole direction, and the second magnetic element has a second magnetic pole direction, wherein the second sensing element senses the magnetic field strength of the second magnetic element in the second magnetic pole direction.

[0015] In one embodiment, the first and second magnetic elements are disposed on the movable part, and the first and second sensing elements are disposed on the fixed part.

[0016] In one embodiment, the aforementioned first-dimensional coordinate is a linear coordinate perpendicular to an optical axis of the aforementioned optical element, and the aforementioned second-dimensional coordinate is an angular coordinate.

[0017] In one embodiment, the aforementioned sensing component further includes a third sensing element, which senses the movement of the aforementioned movable part relative to the aforementioned fixed part in a third-dimensional coordinate, and generates a third sensing value, wherein the aforementioned third-dimensional coordinate is different from the aforementioned first and second-dimensional coordinates.

[0018] In one embodiment, the aforementioned control unit is electrically connected to the aforementioned three sensing elements, and generates a second error value based on the aforementioned third sensing value and a second error relationship curve, wherein the aforementioned second error relationship curve represents the relationship curve between the aforementioned second sensing value generated by the aforementioned second sensing element and the aforementioned third-dimensional coordinate when the aforementioned movable part moves only along the aforementioned third-dimensional coordinate relative to the aforementioned fixed part, and the aforementioned control unit corrects the aforementioned second sensing value based on the aforementioned first and second error values, and outputs the aforementioned drive signal to the aforementioned drive assembly to drive the aforementioned movable part to move relative to the aforementioned fixed part.

[0019] In one embodiment, the aforementioned second error relationship curve is generated by an external calibration device by measuring the positional change of the aforementioned moving part relative to the aforementioned fixed part, and after the aforementioned second error relationship curve is generated, the aforementioned external calibration device is removed from the aforementioned optical system.

[0020] In one embodiment, when the aforementioned external calibration device measures the positional change of the aforementioned movable part relative to the aforementioned fixed part, the aforementioned movable part is fixed at a reference point on the aforementioned second-dimensional coordinate system relative to the aforementioned fixed part.

[0021] In one embodiment, the aforementioned optical system further includes a first magnetic element and a second magnetic element. The first magnetic element has a first magnetic pole direction, wherein the first sensing element senses the magnetic field strength of the first magnetic element in the first magnetic pole direction. The second magnetic element has a second magnetic pole direction, wherein the second sensing element senses the magnetic field strength of the second magnetic element in the second magnetic pole direction, and the first and second magnetic pole directions are not parallel. The third magnetic element has a third magnetic pole direction, wherein the third sensing element senses the magnetic field strength of the third magnetic element in the third magnetic pole direction.

[0022] In one embodiment, the direction of the third magnetic pole is perpendicular to the direction of the first magnetic pole.

[0023] In one embodiment, the direction of the aforementioned third magnetic pole is neither parallel nor perpendicular to the direction of the aforementioned first magnetic pole.

[0024] In one embodiment, the direction of the third magnetic pole is parallel to the direction of the first magnetic pole or the direction of the second magnetic pole.

[0025] In one embodiment, the first, second, and third magnetic elements are disposed on the aforementioned movable part, and the first, second, and third sensing elements are disposed on the aforementioned fixed part.

[0026] In one embodiment, the aforementioned third-dimensional coordinate is a linear coordinate perpendicular to an optical axis of the aforementioned optical element, and the aforementioned second-dimensional coordinate is an angular coordinate.

[0027] The beneficial effect of this disclosure is that, after determining the actual angular displacement of the movable part relative to the fixed part, the displacement of the movable part relative to the fixed part in the X-axis coordinate direction, the displacement in the Y-axis coordinate direction, and the angular displacement centered on the optical axis can be confirmed. The control unit can then output a drive signal to the drive assembly to drive the movable part to move relative to the fixed part to a target position, thereby achieving the effect of precise positioning control. Attached Figure Description

[0028] Figure 1 and Figure 2 An exploded view showing an embodiment of the optical system of the present invention.

[0029] Figure 3 express Figure 1 and Figure 2 A schematic diagram showing the relative positions of the outer frame, the magnetic element disposed on the outer frame, and the sensing element disposed on the substrate.

[0030] Figure 4 This is a schematic diagram showing the relative positional relationship between the outer frame, the magnetic element disposed on the outer frame, and the sensing element disposed on the substrate in an optical system according to another embodiment of the present invention.

[0031] Figures 5-7 These curves represent the relationship between the change in magnetic field strength sensed by the sensing element and the X-axis coordinate when the moving part is displaced only slightly along the X-axis relative to the fixed part.

[0032] Figures 8-10 These curves represent the relationship between the change in magnetic field strength sensed by the sensing element and the Y-axis coordinate when the moving part is displaced only slightly along the Y-axis relative to the fixed part.

[0033] Figures 11-13 These represent the curves showing the relationship between the change in magnetic field strength sensed by the sensing element and a rotation angle coordinate when the moving part rotates only around the optical axis O within a small angular range relative to the fixed part.

[0034] Figure 14 This is a schematic diagram showing the relative positional relationship between the outer frame, the magnetic element disposed on the outer frame, and the sensing element disposed on the substrate, according to another embodiment of the present invention.

[0035] The attached figures are labeled as follows:

[0036] BT: Outer frame

[0037] F: Flexible Circuit Board

[0038] I: Image sensor

[0039] H: Top cover

[0040] HM1 magnetic element (first magnetic element)

[0041] HM2 magnetic element (third magnetic element)

[0042] HM3 magnetic element (second magnetic element)

[0043] HS1: Sensing element (first sensing element)

[0044] HS2: Sensing element (third sensing element)

[0045] HS3: Sensing element (second sensing element)

[0046] MR: Bearing unit

[0047] O: Optical axis

[0048] P: Substrate

[0049] S: Driver Components Detailed Implementation

[0050] The following describes an optical system according to an embodiment of the present invention. However, it will be readily apparent that the embodiments of the present invention provide many suitable inventive concepts and can be implemented in a wide range of specific contexts. The specific embodiments disclosed are merely illustrative of the use of the invention in particular ways and are not intended to limit the scope of the invention.

[0051] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the relevant art and the background or context of this disclosure, and should not be interpreted in an idealized or overly formal manner, unless specifically defined herein.

[0052] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used in the embodiments are for illustrative purposes and not for limiting the present invention.

[0053] Please refer to both at the beginning. Figure 1 , Figure 2 and Figure 3 ,in Figure 1 and Figure 2 An exploded view showing an embodiment of the optical system of the present invention. Figure 3 express Figure 1 and Figure 2A schematic diagram showing the relative positions of the outer frame BT, the magnetic elements HM1, HM2, and HM3 disposed on the outer frame BT, and the sensing elements HS1, HS2, and HS3 disposed on the substrate P.

[0054] like Figure 1 and Figure 2 As shown, the optical system in this embodiment is, for example, a camera system, which mainly includes a top cover H, a support unit MR, a driving component S, a flexible circuit board F, an outer frame BT, a substrate P, and an image sensor I. The top cover H is connected to the outer frame BT, the support unit MR and the flexible circuit board F are disposed in a receiving space formed by the top cover H and the outer frame BT, and the image sensor I is disposed on the substrate P.

[0055] It should be understood that an optical element (e.g., an optical lens) may be disposed within the carrier unit MR, and the flexible circuit board F may be used to electrically connect the carrier unit MR and an external circuit.

[0056] The aforementioned support unit MR may include, for example, a voice coil motor (VCM), wherein the voice coil motor can drive the aforementioned optical element (e.g., an optical lens) to move along the Z-axis direction, and the aforementioned drive component S is disposed below the support unit MR and connected to the substrate P.

[0057] In this embodiment, the aforementioned driving component S may include a shape memory alloy element (SMA), and a current may be applied to the aforementioned shape memory alloy element by an external circuit through a substrate P (e.g., a printed circuit board). At this time, the shape memory alloy element will deform and drive the movable part (including the top cover H, the outer frame BT, the carrier unit MR, the flexible circuit board F, and the optical element) to translate or rotate relative to the fixed part (the substrate P and the image sensor I) in a horizontal direction, wherein the aforementioned horizontal direction is perpendicular to the aforementioned optical axis O, and the aforementioned optical axis O is parallel to the Z-axis.

[0058] It should be noted that three magnetic elements HM1, HM2, and HM3 (first, third, and second magnetic elements) are provided at the corners of the aforementioned outer frame BT. Additionally, three sensing elements HS1, HS2, and HS3 (first, third, and second sensing elements) are provided on the substrate P. The sensing elements HS1, HS2, and HS3 are positioned directly below the magnetic elements HM1, HM2, and HM3, respectively. Figure 3 In this way, the magnetic field strength of the magnetic elements HM1, HM2, and HM3 can be sensed by the sensing elements HS1, HS2, and HS3 respectively, thereby knowing the positional changes of the aforementioned moving part relative to the fixed part in different dimensional coordinates.

[0059] In one embodiment, the aforementioned sensing elements HS1, HS2, and HS3 may be Hall effect sensors, magnetoresistive effect sensors (MR sensors), giant magnetoresistive effect sensors (GMR sensors), or tunneling magnetoresistive effect sensors (TMR sensors), and the aforementioned magnetic elements HM1, HM2, and HM3 may be magnets.

[0060] Please refer to the following: Figure 4 ,in Figure 4 This diagram illustrates the relative positions of the outer frame BT, the magnetic elements HM1, HM2, and HM3 disposed on the outer frame BT, and the sensing elements HS1, HS2, and HS3 disposed on the substrate P in an optical system according to another embodiment of the present invention.

[0061] like Figure 4 As shown, in another embodiment of the optical system of the present invention, magnetic elements HM1 and HM2 can also be disposed at the center of adjacent two sides of the outer frame BT, and magnetic element HM3 can be disposed at the center of the other side of the outer frame BT.

[0062] Specifically, the magnetic poles of the aforementioned magnetic element HM1 are parallel to the X-axis, the magnetic poles of the aforementioned magnetic element HM2 are parallel to the Y-axis, and the magnetic poles of the aforementioned magnetic element HM3 are not parallel to either the X or Y axes. In this embodiment, the magnetic poles of the aforementioned magnetic element HM3 are at a 45-degree angle to both the X and Y axes, but this is not limited to the embodiments disclosed herein.

[0063] It should be understood that the sensing elements HS1, HS2, and HS3 disposed on the substrate P are mainly used to sense the magnetic field strength of the magnetic elements HM1, HM2, and HM3 respectively, so as to know the positional changes of the aforementioned moving part relative to the fixed part in different dimensional coordinates.

[0064] In this embodiment, since the magnetic pole directions of magnetic elements HM1, HM2, and HM3 are different, sensing element HS1 can be used to sense the displacement of the movable part relative to the fixed part in the X-axis direction, sensing element HS2 can be used to sense the displacement of the movable part relative to the fixed part in the Y-axis direction, and sensing element HS3 can be used to sense the angular displacement of the movable part relative to the fixed part around the optical axis O.

[0065] Please refer to the following as well. Figures 5-7 ,in Figures 5-7These curves represent the relationship between the change in magnetic field strength sensed by sensing elements HS1, HS2, and HS3 and the X-axis coordinate when the moving part is displaced only slightly along the X-axis relative to the fixed part.

[0066] like Figure 5 As shown, when the moving part is displaced only along the X-axis relative to the fixed part, since the magnetic pole direction of the magnetic element HM1 is parallel to the X-axis, the sensing element HS1 can sense the change in the magnetic field of the magnetic element HM1 relative to the X-axis coordinate.

[0067] However, as Figure 6 As shown, when the movable part is displaced only along the X-axis relative to the fixed part, since the magnetic pole direction of the magnetic element HM2 is perpendicular to the X-axis, the sensing element HS2 will not sense the change in the magnetic field of the magnetic element HM2 relative to the X-axis coordinate.

[0068] In addition, such as Figure 7 As shown, when the moving part displaces only along the X-axis relative to the fixed part, although the moving part does not rotate relative to the fixed part, the sensing element HS3 will still sense the change in the magnetic field strength of the magnetic element HM3 due to crosstalk. In this case, the change in magnetic field strength sensed by the sensing element HS3 will not reflect the actual angular displacement of the moving part relative to the fixed part. Figure 7 The relationship curve is a first error relationship curve caused by crosstalk.

[0069] Please refer to the following as well. Figures 8-10 ,in Figures 8-10 These figures represent the curves showing the relationship between the change in magnetic field strength sensed by sensing elements HS1, HS2, and HS3 and the Y-axis coordinate when the moving part is displaced only slightly along the Y-axis relative to the fixed part.

[0070] like Figure 8 As shown, when the moving part is displaced only along the Y-axis relative to the fixed part, since the magnetic pole direction of the magnetic element HM1 is perpendicular to the Y-axis, the sensing element HS1 will not sense the change in the magnetic field of the magnetic element HM1 relative to the Y-axis coordinate.

[0071] However, as Figure 9 As shown, when the moving part is displaced only along the Y-axis relative to the fixed part, since the magnetic pole direction of the magnetic element HM2 is parallel to the Y-axis, the sensing element HS2 can sense the change in the magnetic field of the magnetic element HM2 relative to the Y-axis coordinate.

[0072] In addition, such as Figure 10As shown, when the moving part displaces only along the Y-axis relative to the fixed part, although the moving part does not rotate relative to the fixed part, the sensing element HS3 will still sense the change in the magnetic field strength of the magnetic element HM3 due to crosstalk. In this case, the change in magnetic field strength sensed by the sensing element HS3 also cannot reflect the actual angular displacement of the moving part relative to the fixed part. Figure 10 The relationship curve is a second error relationship curve caused by crosstalk.

[0073] Please refer to the following as well. Figures 11-13 ,in Figures 11-13 These curves represent the relationship between the change in magnetic field strength sensed by sensing elements HS1, HS2, and HS3 and a rotation angle coordinate when the movable part rotates only around the optical axis O within a small angle range relative to the fixed part.

[0074] from Figures 11-13 As can be seen, when the moving part rotates only around the optical axis O within a small angular range relative to the fixed part, no crosstalk occurs for the sensing elements HS1 and HS2. In other words, the sensing elements HS1 and HS2 do not sense the change in the magnetic field of the magnetic elements HM1 and HM2 relative to the rotation angle coordinate. Figure 11 and Figure 12 Only the sensing element HS3 can sense the change in the magnetic field of the magnetic element HM3 relative to the rotation angle coordinate.

[0075] It should be understood that the aforementioned sensing elements HS1, HS2, and HS3 can generate corresponding sensing values ​​based on the magnetic field strength they sense. Therefore Figure 7 The first error relationship curve in the figure represents the relationship between the sensing value generated by the sensing element HS3 and the X-axis coordinate when the moving part moves only along the X-axis coordinate relative to the fixed part.

[0076] Similarly, Figure 10 The second error relationship curve can be regarded as the relationship curve between the sensing value generated by the sensing element HS3 and the Y-axis coordinate when the moving part moves only along the Y-axis coordinate relative to the fixed part.

[0077] In order to accurately calculate the actual angular displacement of the movable part relative to the fixed part without being affected by the displacement of the movable part along the X and Y axes, an additional control unit (not shown) is provided in the optical system of this embodiment. The aforementioned control unit may be a processor disposed on the substrate P and electrically connected to the sensing elements HS1, HS2, and HS3.

[0078] It should be noted that, in addition to receiving the sensing values ​​from sensing elements HS1, HS2, and HS3, the aforementioned control unit can also correct the sensing value of HS3 based on the sensing values ​​generated by sensing elements HS1 and HS2 and the aforementioned first and second error relationship curves, thereby calculating the actual angular displacement of the moving part relative to the fixed part.

[0079] After knowing the actual angular displacement of the movable part relative to the fixed part, the displacement of the movable part relative to the fixed part in the X-axis coordinate direction, the displacement in the Y-axis coordinate direction, and the angular displacement centered on the optical axis O can be confirmed. Then, the control unit can output a drive signal to the drive component S to drive the movable part to move relative to the fixed part to a target position, and achieve the effect of precise positioning control.

[0080] For example, when the aforementioned movable part moves relative to the fixed part along the X-axis coordinate (first dimension coordinate) and simultaneously rotates around the optical axis O along a angular coordinate (second dimension coordinate), it can first be based on the sensing element.

[0081] The curve showing the relationship between the sensed value (first sensed value) generated by HS1 (first sensing element) and the X-axis coordinate. Figure 5 This allows us to determine the actual displacement of the moving part in the X-axis direction.

[0082] Next, based on the actual displacement in the X-axis direction and the aforementioned first error relationship curve ( Figure 7 The error value (first error value) measured due to crosstalk caused by the movement of the moving part of the sensing element HS3 in the X-axis direction is calculated; then, the original sensing element can be corrected based on this error value.

[0083] The sensing value (second sensing value) generated by HS3 (second sensing element) is used to determine the actual angular displacement of the moving part relative to the fixed part.

[0084] Similarly, when the aforementioned moving part moves relative to the fixed part along the Y-axis coordinate (third dimension coordinate) at the same time, the relationship curve between the sensing value (third sensing value) generated by the sensing element HS2 (third sensing element) and the Y-axis coordinate can be used first. Figure 8 The actual displacement of the moving part in the Y-axis direction is known.

[0085] Next, based on the actual displacement in the Y-axis direction and the aforementioned first error relationship curve ( Figure 10 The error value (second error value) measured by the sensing element HS3 due to crosstalk caused by the movement of the moving part in the Y-axis direction is calculated. Then, the sensing value (second sensing value) originally measured by the sensing element HS3 can be corrected according to the multiple error values ​​(first and second error values) to know the actual angular displacement of the moving part relative to the fixed part.

[0086] Finally, the control unit can output a drive signal to the drive component S to drive the moving part to move relative to the fixed part to a target position, thereby achieving the effect of precise positioning control.

[0087] It should be understood that Figure 7 and Figure 10 The first and second error relationship curves can be generated by an external calibration device by receiving the sensing values ​​of sensing elements HS1, HS2, and HS3 and measuring the positional change of the moving part relative to the fixed part. After generating the first and second error relationship curves, the external calibration device can be removed from the optical system.

[0088] Specifically, when the external calibration device measures the positional change of the movable part relative to the fixed part, the movable part is fixed relative to the fixed part at a reference point in the angular coordinate (second dimension coordinate) and does not rotate around the O axis. Furthermore, as described above, the central axis of the angular coordinate (second dimension coordinate) is parallel to the optical axis O and perpendicular to the X and Y axes (first and third dimension coordinates).

[0089] Please refer to the following: Figure 14 , Figure 14 This is a schematic diagram showing the relative positional relationship of the outer frame BT, the magnetic elements HM1, HM2, and HM3 disposed on the outer frame BT, and the sensing elements HS1, HS2, and HS3 disposed on the substrate P, according to another embodiment of the present invention.

[0090] like Figure 14 As shown, this embodiment is similar to Figure 4 The main difference in the embodiments is that the magnetic pole direction (first magnetic pole direction) of magnetic element HM1 (first magnetic element) is parallel to the X-axis, and the magnetic pole direction (second magnetic pole direction) of magnetic element HM3 (second magnetic element) is parallel to the X-axis.

[0091] The magnetic pole direction of HM2 (the third magnetic element) is parallel to the Y-axis, while the magnetic pole directions of sensing elements HS1, HS2, and HS3 are all perpendicular to the optical axis O.

[0092] In one embodiment, the magnetic pole direction (third magnetic pole direction) of the aforementioned magnetic element HM2 may not be parallel or perpendicular to the magnetic pole direction (first magnetic pole direction) of the magnetic element HM1; or, the magnetic pole direction (third magnetic pole direction) of the magnetic element HM2 may be parallel to the magnetic pole direction (first magnetic pole direction) of the magnetic element HM1 or the magnetic pole direction (third magnetic pole direction) of the magnetic element HM2, and is not limited to those disclosed in this embodiment.

[0093] While the embodiments and advantages of the present invention have been disclosed above, it should be understood that those skilled in the art can make modifications, substitutions, and refinements without departing from the spirit and scope of the invention. Furthermore, the scope of protection of the present invention is not limited to the processes, machines, manufacturing methods, material compositions, apparatuses, methods, and steps described in the specific embodiments of the specification. Any processes, machines, manufacturing methods, material compositions, apparatuses, methods, and steps currently or in the future that can be developed from the disclosure of this invention can be used according to the present invention, as long as they can perform substantially the same function or obtain substantially the same results in the embodiments described herein. Therefore, the scope of protection of the present invention includes the aforementioned processes, machines, manufacturing methods, material compositions, apparatuses, methods, and steps. In addition, each claim constitutes an individual embodiment, and the scope of protection of the present invention also includes combinations of the various claims and embodiments.

[0094] Although the present invention has been disclosed above with reference to 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 movable portion configured to connect an optical element; a fixed portion, wherein the movable portion is movable relative to the fixed portion; a driving assembly configured to drive the movable portion to move relative to the fixed portion; a first sensing element configured to sense movement of the movable portion relative to the fixed portion in a first dimension coordinate and generate a first sensing value, wherein the first dimension coordinate is a linear coordinate; a second sensing element configured to sense movement of the movable portion relative to the fixed portion in a second dimension coordinate and generate a second sensing value, wherein the second dimension coordinate is an angular coordinate; and a control unit electrically connected to the first and second sensing elements, and configured to generate a first error value according to the first sensing value and a first error relationship curve, wherein the first error relationship curve represents a relationship between the second sensing value generated by the second sensing element and the first dimension coordinate when the movable portion moves relative to the fixed portion only along the first dimension coordinate, and the control unit is configured to correct the second sensing value according to the first error value and output a driving signal to the driving assembly to drive the movable portion to move relative to the fixed portion.

2. The optical system of claim 1, wherein the first error relationship curve is generated by an external calibration device by measuring position changes of the movable portion relative to the fixed portion, and the external calibration device is removed from the optical system after the first error relationship curve is generated.

3. The optical system of claim 2, wherein the movable portion is fixed relative to the fixed portion at a reference point in the second dimension coordinate when the external calibration device measures the position changes of the movable portion relative to the fixed portion.

4. The optical system of claim 1, wherein the optical system further comprises a first magnetic element having a first magnetic pole direction and a second magnetic element having a second magnetic pole direction, wherein the first and second magnetic elements are disposed on the movable portion, and the first and second sensing elements are disposed on the fixed portion to sense magnetic field strengths of the first and second magnetic elements, respectively.

5. The optical system of claim 4, wherein the first magnetic pole direction is not parallel to the second magnetic pole direction.

6. The optical system of claim 4, wherein the first magnetic pole direction and the second magnetic pole direction are both perpendicular to an optical axis of the optical element.

7. The optical system of claim 4, wherein the first magnetic pole direction and the second magnetic pole direction are different by 45 degrees.

8. The optical system of claim 1, wherein the optical system further comprises: a first magnetic element having a first magnetic pole direction, wherein the first sensing element senses a magnetic field strength of the first magnetic element in the first magnetic pole direction; and a second magnetic element having a second magnetic pole direction, wherein the second sensing element senses a magnetic field strength of the second magnetic element in the second magnetic pole direction.

9. The optical system of claim 8, wherein the first and second magnetic elements are disposed on the movable portion, and the first and second sensing elements are disposed on the fixed portion. ​ 10. The optical system of claim 1, wherein the first dimension is perpendicular to an optical axis of the optical element.

11. The optical system of claim 1, wherein the optical system further comprises a third sensing element sensing movement of the movable portion relative to the fixed portion along a third dimension, and generating a third sensing value, wherein the third dimension is a linear dimension and is different from the first and second dimensions.

12. The optical system of claim 11, wherein the control unit is electrically connected to the three sensing elements, and generates a second error value based on the third sensing value and a second error relationship curve, wherein the second error relationship curve represents a relationship between the second sensing value generated by the second sensing element and the third dimension when the movable portion moves relative to the fixed portion only along the third dimension, and the control unit corrects the second sensing value based on the first and second error values, and outputs the driving signal to the driving assembly to drive the movable portion to move relative to the fixed portion.

13. The optical system of claim 12, wherein the second error relationship curve is generated by an external calibration device by measuring position changes of the movable portion relative to the fixed portion, and the external calibration device is removed from the optical system after the second error relationship curve is generated.

14. The optical system of claim 13, wherein a reference point on the second dimension is fixed relative to the fixed portion when the external calibration device measures the position changes of the movable portion relative to the fixed portion.

15. The optical system of claim 11, wherein the optical system further comprises: a first magnetic element having a first magnetic pole direction, wherein the first sensing element senses a magnetic field strength of the first magnetic element in the first magnetic pole direction; a second magnetic element having a second magnetic pole direction, wherein the second sensing element senses a magnetic field strength of the second magnetic element in the second magnetic pole direction, wherein the first and second magnetic pole directions are not parallel; and a third magnetic element having a third magnetic pole direction, wherein the third sensing element senses a magnetic field strength of the third magnetic element in the third magnetic pole direction.

16. The optical system of claim 15, wherein the third magnetic pole direction is perpendicular to the first magnetic pole direction.

17. The optical system of claim 15, wherein the third magnetic pole direction is neither parallel nor perpendicular to the first magnetic pole direction.

18. The optical system of claim 15, wherein the third magnetic pole direction is parallel to the first magnetic pole direction or the second magnetic pole direction.

19. The optical system of claim 15, wherein the first, second, and third magnetic elements are disposed on the movable portion, and the first, second, and third sensing elements are disposed on the fixed portion.

20. The optical system of claim 15, wherein the third dimension is perpendicular to an optical axis of the optical element. ​ ​ ​ ​

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