Patent Publication Number: US-2021190952-A1

Title: Optical sensing system

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority of provisional U.S. Patent Application Ser. No. 62/799,886, filed on Feb. 1, 2019, and European Patent Application No. 19218906.6 filed Dec. 20, 2019, the entirety of which are incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The application relates in general to a driving mechanism, and in particular, to a driving mechanism for moving an optical element. 
     Description of the Related Art 
     With the progress being made in 3D sensing technologies, Advanced Driver Assistance Systems (ADAS) have been installed in modern vehicles. For example, Advanced Driver Assistance Systems (ADAS) may have such functions as real-time 3D object detection, large-scale 3D vehicle detection, and 3D object recognition. 
     Conventional 3D sensing technologies may be implemented by applying light detection and ranging (LiDAR), infrared detection, or ultrasound detection. However, to improve the efficiency and reduce the sizes of conventional 3D sensing devices become a challenge. Moreover, since various optical sensing technologies have been applied to the field of point-of-care testing (POCT), it has also become a challenge to improve the efficiency and achieve miniaturization of the optical sensing systems. 
     BRIEF SUMMARY OF INVENTION 
     In view of the aforementioned problems, the object of the invention is to provide an optical sensing system that includes a sensing module, a light emitter, and a light receiver. The sensing module has a substrate, a light guide element disposed on the substrate, and a sensing film disposed on the light guide element for retaining a specimen. The light emitter emits a sensing light to the light guide element. The light receiver receives the sensing light that propagates through the light guide element. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1  is an exploded diagram of a driving mechanism in accordance with an embodiment of the invention. 
         FIG. 2  is a perspective diagram of the driving mechanism in  FIG. 1  after assembly. 
         FIG. 3  is a perspective diagram showing an optical system in the driving mechanism of  FIGS. 1 and 2 . 
         FIG. 4  is an exploded diagram of the spring sheet S, the optical element R 1 , and the mirror R 2  in  FIG. 3 . 
         FIG. 5  is a top view of the spring sheet S, the magnets M, and the magnetic permeable sheets Q in  FIGS. 1 and 2 . 
         FIG. 6  is a bottom view of the spring sheet S, the magnets M, and the magnetic permeable sheets Q in  FIGS. 1 and 2 . 
         FIGS. 7 and 8  are exploded and perspective diagrams of a spring sheet S, an optical element R 1 , a mirror R 2 , two coils W, and a bobbin N, in accordance with another embodiment of the invention. 
         FIG. 9  is a perspective diagram that shows the coils W in  FIG. 8  electrically connecting to the circuits E 3  on the spring sheet S. 
         FIG. 10  is a perspective diagram of an optical system in accordance with another embodiment of the invention. 
         FIGS. 11 and 12  are exploded and perspective diagrams of a light emitter D 3 , a light receiver D 4 , and a substrate I disposed on a spring sheet S, in accordance with another embodiment of the invention. 
         FIG. 13  is a perspective diagram of an optical system in accordance with another embodiment of the invention. 
         FIG. 14  is an exploded diagram of a spring sheet S, a coil W, and several magnets MX and MY, in accordance with another embodiment of the invention. 
         FIG. 15  is a perspective diagram showing the spring sheet S, the coil W, and the magnets MX and MY in  FIG. 14  assembled to a fixed member H. 
         FIG. 16  is a perspective diagram showing the relative positions of the spring sheet S and the magnets MX and MY in  FIG. 15 . 
         FIG. 17  is a perspective diagram showing the relative positions of a spring sheet S, at least one coil W, and several magnets M, in accordance with another embodiment of the invention. 
         FIG. 18  is a perspective diagram of a driving mechanism in accordance with an embodiment of the invention. 
         FIG. 19  is a perspective diagram of the two spring sheets S in  FIG. 18 . 
         FIG. 20  is a perspective diagram of a spring sheet S in accordance with another embodiment of the invention. 
         FIG. 21  is a partial sectional view showing a coil Y 21  and a circuit Y 31  formed on the same side of the spring sheet S. 
         FIG. 22  is a partial sectional view showing a coil Y 21  and a circuit Y 31  formed on the opposite sides of the spring sheet S. 
         FIGS. 23 and 24  are partial perspective view and top view of a driving mechanism in accordance with another embodiment of the invention. 
         FIG. 25  is a perspective diagram of a cover T in accordance with another embodiment of the invention. 
         FIG. 26  is a partial sectional view of the cover T in  FIG. 25 , a fixed member H connected to the cover T, and two magnets M received in the cover T after assembly. 
         FIG. 27  is a perspective diagram of an optical sensing system in accordance with an embodiment of the invention. 
         FIG. 28  is a perspective diagram of the optical module SM that changes the propagation direction of the sensing light L 1  in  FIG. 27 . 
         FIG. 29  is a perspective diagram of the sensing light L 1  reflected by the optical element R 1  to the object O while the light path adjusting element PR rotates around the second axis A 2 . 
         FIG. 30  is a perspective diagram showing the optical element R 1  continuously rotates around the first axis A 1  back and forth within a first range RA 1 , and the light path adjusting element PR rotates around the second axis A 2  within a second range RA 2  in a stepwise manner. 
         FIG. 31  is a perspective diagram of an upper module of a driving mechanism in accordance with an embodiment of the invention. 
         FIG. 32  is an exploded diagram of the spring sheet S, the coils W, and the bobbin N in  FIG. 31 . 
         FIG. 33  is a perspective diagram of sensing module U and an analyzing device V. 
         FIG. 34  is a perspective diagram showing the sensing module U when connected to the analyzing device V. 
         FIG. 35  is a perspective diagram of an optical sensing system in accordance with an embodiment of the invention. 
         FIG. 36  is a perspective diagram of an optical sensing system in accordance with another embodiment of the invention. 
         FIG. 37  is a perspective diagram of an optical sensing system in accordance with another embodiment of the invention. 
         FIG. 38  is a perspective diagram showing the sensing light L propagates from the light emitter D 5  through the sensing module U to the light receiver D 6 . 
         FIG. 39  is a perspective diagram showing the light emitter D 5  is rotatable relative to the sensing module U. 
         FIG. 40  is a perspective diagram showing the light emitter D 5  and the light receiver D 6  are both rotatable relative to the sensing module U. 
         FIG. 41  is a perspective diagram showing the light emitter D 5  and the sensing module U are rotatable relative to the light receiver D 6 . 
         FIG. 42  is a perspective diagram showing the light receiver D 6  and the sensing module U are rotatable relative to the light emitter D 5 . 
         FIG. 43  is a perspective diagram showing the first light path adjusting element RM 1  is rotatable relative to the sensing module U. 
         FIG. 44  is a perspective diagram showing the first and second light path adjusting elements RM 1  and RM 2  are both rotatable relative to the sensing module U. 
         FIG. 45  is a schematic diagram of an optical member driving mechanism according to an embodiment of the invention; 
         FIG. 46  is an exploded-view diagram of the optical member driving mechanism according to an embodiment of the invention; 
         FIG. 47  is a cross-sectional view along the line A-A in  FIG. 45 ; 
         FIG. 48  is a schematic diagram of an optical member driving mechanism according to another embodiment of the invention; 
         FIG. 49  is a schematic diagram of an optical member driving mechanism according to another embodiment of the invention; 
         FIG. 50  is a schematic diagram of a light emitter, a light receiver, and a movable portion according to another embodiment of the invention; 
         FIG. 51  is a cross-sectional view along the line B-B in  FIG. 50 ; 
         FIG. 52  is a schematic diagram of an optical member driving mechanism according to another embodiment of the invention; 
         FIG. 53  is a schematic diagram of an optical member driving mechanism according to another embodiment of the invention; 
         FIG. 54  is a schematic diagram of an optical member driving mechanism according to another embodiment of the invention; 
         FIG. 55  is a schematic diagram of an optical member driving mechanism according to another embodiment of the invention; 
         FIG. 56  is a schematic diagram of a rotation module, a reflecting member, and a light path adjusting member according to another embodiment of the invention; and 
         FIG. 57  is a schematic diagram of a rotation module and a reflecting member according to another embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF INVENTION 
     The making and using of the embodiments of the optical sensing system are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the embodiments, and do not limit the scope of the disclosure. 
     Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should be appreciated that each term, which is defined in a commonly used dictionary, should be interpreted as having a meaning conforming to the relative skills and the background or the context of the present disclosure, and should not be interpreted in an idealized or overly formal manner unless defined otherwise. 
     In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, and in which specific embodiments of which the invention may be practiced are shown by way of illustration. In this regard, directional terminology, such as “top,” “bottom,” “left,” “right,” “front,” “back,” etc., is used with reference to the orientation of the figures being described. The components of the present invention can be positioned in a number of different orientations. As such, the directional terminology is used for the purposes of illustration and is in no way limiting. 
     Referring to  FIGS. 1-4 ,  FIG. 1  is an exploded diagram of a driving mechanism in accordance with an embodiment of the invention,  FIG. 2  is a perspective diagram of the driving mechanism in  FIG. 1  after assembly,  FIG. 3  is a perspective diagram showing an optical system in the driving mechanism of  FIGS. 1 and 2 , and  FIG. 4  is an exploded diagram of the spring sheet S, the optical element R 1 , and the mirror R 2  in  FIG. 3 . 
     As shown in  FIGS. 1 and 2 , the driving mechanism in this embodiment is used to drive an optical element R 1  (e.g. reflecting mirror) to rotate back and forth within a range, wherein the optical element R 1  can reflect light to an object for the purpose of depth sensing or 3D scanning. 
     The driving mechanism includes an upper module and a lower module. The lower module primarily comprises a base B, a light emitter D 1  disposed on the base B, a light path adjusting element P, a circuit board C, and a light receiver D 2  disposed on the circuit board C. The upper module primarily comprises a fixed member H, a spring sheet S, two magnets M, and two magnetic permeable sheets Q. The fixed member H is secured on the base B, and the spring sheet S, the magnets M, and the magnetic permeable sheets Q are disposed on the fixed member H. Here, the fixed member H and the base B constitute a fixed part of the driving mechanism. The optical element R 1  is disposed on a stage S 3  of the spring sheet S, and they can rotate relative to the fixed member H to perform rapid depth sensing or 3D scanning of an object. 
     The spring sheet S is used as a movable part of the driving mechanism, and it has two fixed ends S 1  affixed to the fixed member H, two deformable portions S 2 , and a stage S 3 . The optical element R 1  is disposed on the top side of the stage S 3 , and the deformable portions S 2  respectively connecting the fixed ends S 1  to the stage S 3 . 
     Specifically, a mirror R 2  and at least one coil E 2  are disposed on the bottom side of the stage S 3  ( FIG. 3 ). When an external circuit applies a current signal to the coil E 2  via the circuit E 1  on the spring sheet S, the magnet M and the coil E 2  (driving assembly) can generate a magnetic force to rotate the stage S 3  around a long axis A (first axis) of the spring sheet S. 
     As shown in  FIG. 3 , when an external light source (not shown) emits a sensing light L 1  to the optical element R 1  on the stage S 3 , the optical element R 1  reflects the sensing light L 1  to an object for depth sensing or 3D scanning. Additionally, the light emitter D 1  in the lower module of the driving mechanism can emit another sensing light L 2  to the light path adjusting element P (e.g. prism). The light path adjusting element P can guide the sensing light L 2  to the mirror R 2  on the bottom side of the stage S 3 , and the mirror R 2  reflects the sensing light L 2  to the light receiver D 2 , so as to obtain posture angle information of the optical element R 1  relative to the fixed member H. When the light receiver D 2  receives the sensing light L 2  that is reflected by the mirror R 2 , it can transmit an electrical signal to a processor via the circuit board C, whereby closed-loop rotational control for the stage S 3  of the spring sheet S and the optical element R 1  can be performed. 
     In some embodiments, the mirror R 2  may be omitted from the driving mechanism, and the bottom surface of the stage S 3  may be smooth or polished to reflect the sensing light L 2 . In some embodiments, a through hole may be formed on the stage S 3  for receiving the optical element R 1  (e.g. double-sided mirror) without the mirror R 2 . 
     It should be noticed that the spring sheet S in this embodiment has a first resonance frequency with respect to the fixed part (the fixed member H and the base B), and an AC current signal can be applied to the coil E 2  on the stage S 3 , wherein the frequency of the AC current signal corresponds to the first resonance frequency. Thus, the stage S 3  can be driven to rapidly rotate back and forth within a range around the long axis A of the spring sheet S for depth sensing or 3D scanning of an object. For example, the first resonance frequency is about 300-1000 Hz, and the frequency of the AC current signal is about 0.9 to 1.1 times the first resonance frequency, so that the rotational angle of the stage S 3  and the scanning range of the sensing light L 1  can be increased. 
       FIG. 5  is a top view of the spring sheet S, the magnets M, and the magnetic permeable sheets Q in  FIGS. 1 and 2 , and  FIG. 6  is a bottom view of the spring sheet S, the magnets M, and the magnetic permeable sheets Q in  FIGS. 1 and 2 . As shown in  FIGS. 5 and 6 , the spring sheet S may comprise metal and have a rectangular structure. The magnets M and the magnetic permeable sheets Q are arranged on two long sides of the spring sheet S, and the circuit E 1  and the coil E 2  are respectively formed on the top and bottom sides of the spring sheet S by metallic printing ink or circuit-on-metal technology. In some embodiments, the spring sheet S may comprise SUS 304H stainless steel that has high mechanical strength and reliability. 
     As mentioned above, the circuit E 1  and the coil E 2  can be integrally formed on the top and bottom sides of the spring sheet S, wherein an insulating layer is formed between the circuit E 1  and the spring sheet S, and another insulating layer is formed between the coil E 2  and the spring sheet S. The circuit E 1  and the coil E 2  can be electrically connected to each other via the stage S 3  of the spring sheet S. When an external circuit applies a current signal to the coil E 2  on the bottom side of the spring sheet S via the circuit E 1 , the magnet M and the coil E 2  can produce a magnetic force to rotate the stage S 3  around the long axis A of the spring sheet S, so as to perform depth sensing or 3D scanning of an object. 
     Specifically, the circuit E 1  and the coil E 2  in  FIGS. 5-6  both have at least one segment parallel to the long axis A (first axis), and the segment at least partially overlaps the long axis A when viewed along the Z direction that is perpendicular to the spring sheet S. In some embodiments, the circuit E 1  and the coil E 2  may also have a plurality of segments that are parallel to but do not overlap the long axis A when viewed along the Z direction. 
       FIGS. 7 and 8  are exploded and perspective diagrams of a spring sheet S, an optical element R 1 , a mirror R 2 , two coils W, and a bobbin N, in accordance with another embodiment of the invention.  FIG. 9  is a perspective diagram that shows the coils W in  FIG. 8  electrically connecting to the circuits E 3  on the spring sheet S.  FIG. 10  is a perspective diagram of an optical system in accordance with another embodiment of the invention. 
     As shown in  FIGS. 7-10 , this embodiment is different from  FIGS. 1-6  in that a plurality of circuits E 3  are integrally formed on the bottom side of the spring sheet S by metallic printing ink or circuit-on-metal technology, wherein an insulating layer is formed between the circuits E 3  and the spring sheet S to prevent a short circuit therebetween. 
     The two coils W in  FIGS. 9-10  are respectively connected to the circuits E 3  via the wires E, whereby an external circuit can transmit electrical signals to the coils W via the wires E and the circuits E 3 . It should be noted since two coils W are provided on the bottom side of the spring sheet S, the magnetic force for driving the stage S 3  to rotate can be increased, and the range of depth sensing or 3D scanning can also be increased. 
       FIGS. 11 and 12  are exploded and perspective diagrams of a light emitter D 3 , a light receiver D 4 , and a substrate I disposed on a spring sheet S, in accordance with another embodiment of the invention.  FIG. 13  is a perspective diagram of an optical system in accordance with another embodiment of the invention. 
     As shown in  FIGS. 11-13 , this embodiment is different from  FIGS. 7-10  in that a light emitter D 3 , a light receiver D 4 , and a substrate I are disposed on a spring sheet S, and the optical element R 1  shown in  FIGS. 7-10  is omitted from the driving mechanism.  FIG. 13  shows that the substrate I is disposed on the top side of the spring sheet S, and the light emitter D 3  and the light receiver D 4  are disposed on the substrate I, wherein an insulating layer is formed between the substrate I and the spring sheet S. For example, the light emitter D 3  and the light receiver D 4  may respectively comprise laser diode and photo diode, and the substrate I may comprise a circuit board for electrically connecting the light emitter D 3  and the light receiver D 4  to an external circuit. 
     By directly affixing the light emitter D 3  and the light receiver D 4  to the spring sheet S, the optical element R 1  (e.g. mirror) can be omitted from the driving mechanism. Thus, the positioning accuracy during assembly and the performance of depth sensing or 3D scanning can be greatly increased. Moreover, the production cost and the dimensions of the driving mechanism can also be reduced. In some embodiments, only one of the light emitter D 3  and the light receiver D 4  is disposed on the spring sheet S, so that the circuits on the substrate I can be simplified. 
       FIG. 14  is an exploded diagram of a spring sheet S, a coil W, and several magnets MX and MY, in accordance with another embodiment of the invention.  FIG. 15  is a perspective diagram showing the spring sheet S, the coil W, and the magnets MX and MY in  FIG. 14  assembled to a fixed member H.  FIG. 16  is a perspective diagram showing the relative positions of the spring sheet S and the magnets MX and MY in  FIG. 15 . 
     As shown in  FIGS. 14-16 , the spring sheet S and the magnets MX and MY in this embodiment are affixed to the fixed member H, wherein the coil W can be integrally formed on the bottom side the spring sheet S by metallic printing ink or circuit-on-metal technology. Specifically, the spring sheet S has two meandering deformable portions S 2 . When the coil W is energized by an electrical current signal, the coil W and the magnets MY (first magnets) can produce a first magnetic force driving the stage S 3  to rotate around a first axis AY, and the coil W and the magnets MX (second magnets) can produce a second magnetic force driving the stage S 3  to rotate around a second axis AX. 
     For example, the spring sheet S may have a first resonance frequency and a second resonance frequency with respect to the fixed member H, corresponding to the first and second axes AY and AX. When a first AC current signal and a second AC current signal are sequentially applied to the coil W in a first time interval and a second time interval, the stage S 3  of the spring sheet S can be driven to rotate around the first and second axes AY and AX to perform depth sensing or 3D scanning of an object, wherein the frequencies of the first and second AC current signals correspond to the first and second resonance frequencies. 
     In some embodiments, the aforementioned driving mechanism may utilize the two coils W and the bobbin N in  FIGS. 7-10  with the circuits E 3  and wires E ( FIGS. 8-10 ). Thus, two different current signals can be individually applied to the two coils W, to drive the stage S 3  and the optical element R 1  (e.g. mirror) on the stage S 3  to rotate around the first axis AY and the second axis AX at the same time. Here, the second resonance frequency could be over 10 times the first resonance frequency. 
     As shown in  FIG. 16 , four magnets MX and two magnets MY are provided in the driving mechanism, wherein the stage S 3  and the magnets MY overlap when viewed in the X direction, and the stage S 3  and the magnets MX overlap when viewed in the Y direction. Therefore, the stage S 3  and the optical element R 1  thereon can be driven to rotate around the first axis AY and the second axis AX at the same time by the coil W and the magnets MY and MX (driving assembly), thus greatly increasing the range of depth sensing or 3D scanning. 
       FIG. 17  is a perspective diagram showing the relative positions of a spring sheet S, at least one coil W, and several magnets M, in accordance with another embodiment of the invention. As shown in  FIG. 17 , the spring sheet S in this embodiment has four fixed ends S 1  affixed to the fixed part (the fixed member H and the base B), a stage S 3  for carrying the optical element R 1 , and four deformable portions S 2  connecting the four fixed ends S 1  to the stage S 3 . Additionally, four magnets M are affixed to the fixed part, and at least one coil W is affixed to the stage S 3 . When an electrical current signal is applied to the coil W, a magnetic force can be produced to rotate the stage S 3  back and forth within a range relative to the fixed part. Here, the spring sheet S can define a rectangular area, and the four fixed ends S 1  of the spring sheet S are located at the four corners of the rectangular area. 
     Referring to  FIGS. 18 and 19 ,  FIG. 18  is a perspective diagram of a driving mechanism in accordance with an embodiment of the invention, and  FIG. 19  is a perspective diagram of the two spring sheets S in  FIG. 18 . 
     As shown in  FIGS. 18 and 19 , this embodiment is different from  FIGS. 1-2  in that the movable part includes two spring sheets S. Each of the spring sheet S that has a fixed end S 1  secured on the fixed member H, a deformable portion S 2 , and a stage S 3  for carrying the optical element R 1 . 
     In this embodiment, the stages S 3  of the two spring sheets S are spaced apart from each other, and a bobbin N and two coils W are disposed on the bottom sides of the stages S 3 . Here, the bobbin N is affixed to the stages S 3 , and the coils W are wound on the bobbin N. 
     In some embodiments, several circuits such as the circuits E 3  in  FIG. 9  may be integrally formed on the stages S 3  by metallic printing ink or circuit-on-metal technology to electrically connect to the two coils W. 
       FIG. 20  is a perspective diagram of a spring sheet S in accordance with another embodiment of the invention. Referring to  FIG. 20 , the movable part may comprise only one spring sheet S, and two sets of circuits E 3  are integrally formed on the stages S 3  of the spring sheet S by metallic printing ink or circuit-on-metal technology. It should be noted that the two sets of circuits E 3  can be electrically connected to the two coils W, respectively. Moreover, an insulating layer K is formed between the circuits E 3  and the spring sheet S to prevent short circuit therebetween. 
       FIG. 21  is a partial sectional view showing a coil Y 21  and a circuit Y 31  formed on the same side of the spring sheet S. As shown in  FIG. 21 , a multi-layer circuit structure can be formed on a surface of the spring sheet S to replace the bobbin N and the coil W in  FIG. 18 . 
     In some embodiments, the coil Y 21  and the circuit Y 31  can be formed and stacked on the top side of the spring sheet S by metallic printing ink or circuit-on-metal technology, wherein the coil Y 21  is located between the circuit Y 31  and the spring sheet S. Moreover, an insulating layer Y 10  is formed between the coil Y 21  and the spring sheet S, and two insulating structures Y 20  and Y 30  are formed around the coil Y 21  and the circuit Y 31  to prevent short circuit therebetween. 
       FIG. 22  is a partial sectional view showing a coil Y 21  and a circuit Y 31  formed on the opposite sides of the spring sheet S. As shown in  FIG. 22 , this embodiment is different from  FIG. 21  in that the coil Y 21  and the circuit Y 31  are formed on the opposite sides of the spring sheet S, wherein an insulating layer Y 10  is formed between the coil Y 21  and the spring sheet S, and another layer Y 10  is formed between the circuit Y 31  and the spring sheet S. Thus, a multi-layer circuit structure can be formed on the spring sheet S to greatly reduce production cost and the thickness of the driving mechanism. 
       FIGS. 23 and 24  are partial perspective view and top view of a driving mechanism in accordance with another embodiment of the invention. Referring to  FIGS. 23 and 24 , two spring sheet S are used as the movable part of the driving mechanism for sustaining a round optical element R 1 . Moreover, a bobbin N and at least one coil W are affixed to the bottom side of the two spring sheet S, wherein the coil W is wound on the bobbin N. 
     In this embodiment, the bobbin N has a plurality of pins J (positioning structures), and at least one of the pins J extends through and protrudes from the top surface of the spring sheet S to contact and restrict the optical element R 1  in a predetermined position, as shown in  FIGS. 23 and 24 . 
     It should be noted that the driving mechanism may further include a cover (not shown) to protect the spring sheets S and the optical element R 1 , and the stage S 3  of the spring sheet S forms a protrusion S 31  (positioning structure) protruding form a side of the spring sheet S, so as to restrict the cover can in a recess S 32  adjacent to the protrusion S 31 . In this embodiment, each spring sheet S forms two protrusions S 31  that are symmetrical to the deformable portion S 2 , and the two recesses S 32  are formed between the two protrusions S 31  and the deformable portion S 2 . 
     The spring sheet S in this embodiment forms at least one flat surface S 33  (positioning structure) to contact and restrict the magnet M in a predetermined position in the X direction. Additionally, to enhance the connection strength between the spring sheet S and the bobbin N, the spring sheet S forms a bent portion S 34  ( FIG. 23 ) bent toward the bobbin N, whereby the adhesion area between the spring sheet S and the bobbin N can be efficiently increased to prevent the bobbin N being separated from the spring sheet S. 
       FIG. 25  is a perspective diagram of a cover T in accordance with another embodiment of the invention, and  FIG. 26  is a partial sectional view of the cover T in  FIG. 25 , a fixed member H connected to the cover T, and two magnets M received in the cover T after assembly. 
     Referring to  FIGS. 25 and 26 , the cover T in this embodiment is mounted to the fixed member H to protect the components therein. The cover T forms an opening T 0 , a plurality of pillars T 1 , and a plurality of protrusions T 2 , wherein the pillars T 1  and the protrusions T 2  are formed on the inner side of the cover T and extend in the −Z direction (vertical direction). 
     During assembly, each of the magnets M can be positioned in a space T 11  ( FIG. 25 ) between two of the pillars T 1 , and the pillars T 1  can restrict the magnets M to move in the Y direction (horizontal direction). Moreover, as shown in  FIG. 26 , the protrusions T 2  on the inner side of the cover T can contact the magnets M in the −Z direction (vertical direction), so that the magnets M can be restricted in a predetermined position to prevent the magnets M being separated from the fixed member H. 
     Still referring to  FIG. 26 , two magnetic permeable sheets Q may be embedded in the plastic fixed member H by insert molding. As the magnetic permeable sheets Q are located close to the magnets M, the magnets M can be rapidly and automatically attached to the surface of the fixed member H by magnetic attraction between the magnets M and the magnetic permeable sheets Q. Therefore, high positioning accuracy and efficient assembly of the driving mechanism can be achieved. 
     Referring to  FIGS. 27 and 28 ,  FIG. 27  is a perspective diagram of an optical sensing system in accordance with an embodiment of the invention, and  FIG. 28  is a perspective diagram of the optical module SM that changes the propagation direction of the sensing light L 1  in  FIG. 27 . 
     As shown in  FIGS. 27 and 28 , the optical sensing system primarily comprises a light emitter TX, a light receiver RX, an optical module SM, and a focusing lens FL. The optical module SM includes a light path adjusting element PR and an optical element R 1  ( FIG. 28 ). The optical element R 1  and the light path adjusting element PR can be driven to respectively rotate around a first axis A 1  and a second axis A 2  within a range by a driving assembly (e.g. magnets and coils), so as to perform depth sensing or 3D scanning of an object O. 
     Still referring to  FIGS. 27 and 28 , the light emitter TX can emit a sensing light L 1  to the optical module SM, and the light path adjusting element PR and the optical element R 1  of the optical module SM can redirect the sensing light L 1  to the object O. Subsequently, the sensing light L 1  is reflected by the object O and propagates through the focusing lens FL to the light receiver RX. In this embodiment, the light receiver RX can transfer light into an electrical signal and then transmit the electrical signal to a processor (not shown), so that 3D surface and depth information of the object O can be obtained. 
     The optical element R 1  in  FIG. 28  is disposed on a stage S 3  of the spring sheet S. The spring sheet S may comprise a round, oval or rectangular mirror, and any one of the driving mechanisms as disclosed in  FIGS. 1-26  may be applied to the spring sheet S, so that the spring sheet S can be driven to rotate around a first axis A 1  within a first range. Additionally, the light path adjusting element PR may comprise a prism that is movably connected to a fixed part (e.g. the base B and the fixed member H in  FIGS. 1-2 ), and it can rotate around a second axis A 2  relative to the fixed part, wherein the second axis A 2  is not parallel to the first axis A 1 . Here, the second axis A 2  is perpendicular to the first axis A 1 . 
     In this embodiment, the sensing light L 1  emitted from the light emitter TX propagates in an initial direction to the light path adjusting element PR, and the light path adjusting element PR redirects the sensing light L 1  to propagate in an incident direction to the optical element R 1  on the spring sheet S. Subsequently, the sensing light L 1  is reflected by the optical element R 1  to propagate in a reflecting direction and then reach the object O ( FIG. 27 ). Here, the first axis A 1  is perpendicular to the incident direction and the reflecting direction, and the second axis A 2  is perpendicular to the initial direction and the incident direction. 
     It should be noted that the optical element R 1  and the light path adjusting element PR can respectively rotate around the first and second axes A 1  and A 2  back and forth for depth sensing or 3D scanning a surface of the object O. In some embodiments, the optical element R 1  and the stage S 3  of the spring sheet S may be driven to rotate around the first axis A 1  back and forth within a first range by open-loop control, and the light path adjusting element PR may be driven to rotate around the second axis A 2  within a second range by closed-loop control. 
     In some embodiments, the spring sheet S has a first resonance frequency relative to the fixed part, and a first AC current signal can be applied to the coil of the driving assembly, thus driving the stage S 3  to rotate around the first axis A 1  back and forth within the first range. Additionally, the light path adjusting element PR may be driven to rotate around the second axis A 2  by a voice coil motor (VCM). 
       FIG. 29  is a perspective diagram of the sensing light L 1  reflected by the optical element R 1  to the object O while the light path adjusting element PR rotates around the second axis A 2 .  FIG. 30  is a perspective diagram showing the optical element R 1  continuously rotates around the first axis A 1  back and forth within a first range RA 1 , and the light path adjusting element PR rotates around the second axis A 2  within a second range RA 2  in a stepwise manner. 
     As shown in  FIG. 29 , when the light path adjusting element PR rotates around the second axis A 2 , the sensing light L 1  can scan through a fan-shaped area. Since the stage S 3  of the spring sheet S can also rotate around the first axis A 1  back and forth, the sensing light L 1  can reach a specific surface area on the object O for depth sensing of 3D scanning. 
     Referring to  FIG. 30 , the optical element R 1  and the stage S 3  of the spring sheet S are driven to continuously rotate around the first axis A 1  back and forth within the first range RA 1 . However, the light path adjusting element PR is driven to rotate in a stepwise manner around the second axis A 2  within the second range RA 2 , different from the optical element R 1  and the spring sheet S. 
     It should be noted that after the light path adjusting element PR rotates a first step angle SP 1  in a predetermined direction around the second axis A 2  from an initial position IP, the light path adjusting element PR stops rotating around the second axis A 2  temporarily. The light path adjusting element PR will rotate a second step angle SP 2  again in the predetermined direction around the second axis A 2  after the optical element R 1  and the stage S 3  of the spring sheet S rotates throughout the first range RA 1 . 
     Furthermore, after the light path adjusting element PR rotates the second step angle SP 2  around the second axis A 2 , the light path adjusting element PR stops rotating around the second axis A 2  temporarily. Again, the light path adjusting element PR will rotate a third step angle SP 3  around the second axis A 2  after the optical element R 1  and the stage S 3  of the spring sheet S rotates throughout the first range RA 1 , and so on. With the optical element R 1  and the light path adjusting element PR respectively rotating around the first and second axes A 1  and A 2 , the sensing light L 1  can be projected onto a surface area on the object O for depth sensing of 3D scanning. 
       FIG. 31  is a perspective diagram of an upper module of a driving mechanism in accordance with an embodiment of the invention.  FIG. 32  is an exploded diagram of the spring sheet S, the coils W, and the bobbin N in  FIG. 31 . 
     Referring to  FIG. 31 , the upper module in this embodiment is different from  FIGS. 1-2  in that the longitudinal spring sheet S has two curved portions S 21  and two bridge portions S 22 . The curved portions S 21  respectively connects the deformable portions S 2  to the round stage S 3 , and an opening is formed between the curved portions S 21  and two bridge portions S 22 . 
       FIG. 31  also shows that an optical element R 1  and two coils W are respectively disposed on the top side and bottom side of the stage S 3 . In this embodiment, two magnets M are arranged along the diagonal direction of the spring sheet S, and they have the same polar directions. 
     Additionally,  FIG. 32  shows the bobbin N and two coils W (as disclosed in  FIGS. 7-10 ) are disposed on the bottom side of the stage S 3 . Here, the spring sheet S has a first resonance frequency and a second resonance frequency with respect to the fixed part. A first AC current signal can be applied to the coils W in a first time interval, and a second AC current signal can be applied to the coils W in a second time interval. Thus, the stage S 3  can be driven to rotate back and forth around the long axis AL and the short axis AS of the spring sheet S in different time periods. 
     However, in some embodiments, the two coils W can also be energized by the first and second AC current signals at the same time. Thus, the stage S 3  can be driven to rotate back and forth around the long axis AL and the short axis AS of the spring sheet S at the same time, wherein the long axis AL is perpendicular to the short axis AS. For example, the first resonance frequency is from 10 Hz to 30 Hz, and the second resonance frequency is from 300 Hz to 1000 Hz, wherein the second resonance frequency may be over 10 times the first resonance frequency. 
     In some embodiments, the bobbin N can also be replaced by the multiple circuit structure as disclosed in  FIGS. 21 and 22 , wherein the coil or the circuit may be integrally formed on top or bottom side of the spring sheet S by metallic printing ink or circuit-on-metal technology. When the coil is energized by a current signal, the stage S 3  of the spring sheet S can rotate around the long axis AL or the short axis AS. In some embodiments, the circuit may be connected to a position sensor (e.g. Hall effect sensor) to obtain the posture angle of the stage S 3  and the optical element R 1 . 
       FIG. 33  is a perspective diagram of a sensing module U and an analyzing device V, and  FIG. 34  is a perspective diagram showing the sensing module U when connected to the analyzing device V. 
     Referring to  FIGS. 33 and 34 , the sensing module U in this embodiment has a sensing film F. The sensing film F may comprise porous material to adsorb a specimen. To detect some specific substance in the specimen, the sensing module U can be inserted into a slot V 0  on a side of the analyzing device V, so that the sensing module U and the analyzing device V are electrically connected to each other. Subsequently, a light source in the analyzing device V can project light onto the sensing module U for obtaining concentration or quantity information of the substance in the specimen. 
     In some embodiments, the sensing module U may comprise disposable material and is detachably connected to the analyzing device V. Hence, it could be easy to use and especially suitable in the field of point-of-care testing (POCT). 
       FIG. 35  is a perspective diagram of an optical sensing system in accordance with an embodiment of the invention. As shown in  FIG. 35 , when the sensing module U and the analyzing device V are connected to each other, a light emitter D 5  can emit a sensing light L to a first optical coupler PM 1  of the sensing module U, and the sensing light L then enters a light guide element WG under the first optical coupler PM 1 . Subsequently, the sensing light L is reflected multiple times within the light guide element WG and propagates into a second optical coupler PM 2 . A light receiver D 6  in the analyzing device V finally receive the sensing light L and transfer the sensing light L into an electrical signal. 
     It should be noted that the light receiver D 6  can transmit sensing data to a processing unit (not shown) in the analyzing device V according to the sensing light L. The processing unit compares the sensing data with reference data in a memory unit and then transmits an image signal to the display V 1 . In this embodiment, the sensing data includes intensity or phase information of the sensing light L. 
     The light emitter D 5 , the light receiver D 6 , and the sensing module U can constitute an optical system, wherein the sensing module U has a hollow housing U 1  and a substrate SB disposed in the housing U 1 . The light guide element WG is disposed on the substrate SN, and the sensing film F, the first optical coupler PM 1 , and the second optical coupler PM 2  are all disposed on a top surface of the light guide element WG. 
     In some embodiments, the light guide element WG may be an optical waveguide (OWG) that comprises polymer resin, and the substrate SB may comprise quartz or glass. The light emitter D 5  may comprise an LED or LD, the light receiver D 6  may comprise photodiode, and the sensing light L may be laser or general light. Additionally, the first and second optical couplers PM 1  and PM 2  may comprise prisms or other optical lenses, and the sensing film F is located between the first and second optical couplers PM 1  and PM 2 . 
     As mentioned above, when the sensing light L propagates through the first optical coupler PM 1  into the light guide element WG, the sensing light L is reflected multiple times inside the light guide element WG, and an evanescent wave of the sensing light L can cause Surface Plasmon Resonance (SPR) between the light guide element WG and the sensing film F. As a result, the specific substance in the specimen that is attached to the sensing film F (or the reaction product generated by the specific substance and the sensing film F) can absorb the energy of the sensing light L or cause phase variation of the sensing light L. 
     Hence, the intensity or phase of the sensing light L received by the light receiver D 6  would be different from the sensing light L generated by the light emitter D 5 , whereby the concentration or quantity of the specific substance in the specimen can be determined. For example, the specific substance may comprise glucose or anti-allergen antibody. 
     Specifically, to compensate the positioning error between the light emitter D 5  and the first optical coupler PM 1 , a driving mechanism DM 1  in the analyzing device V is provided and connected to the light emitter D 5 . The driving mechanism DM 1  can drive the light emitter D 5  to rotate relative to the sensing module U, to ensure the sensing light L emitted by the light emitter D 5  can successfully and efficiently propagate through the first optical coupler PM 1  to the light guide element WG. 
     Similarly, another driving mechanism DM 2  in this embodiment is provided and connected to the light receiver D 6  for driving the light receiver D 6  to rotate relative to the sensing module U, thus ensuring the sensing light L that propagates through the second optical coupler PM 2  can efficiently and successfully reach the light receiver D 6 . 
     For example, the driving mechanisms DM 1  and DM 2  may comprise a voice coil motor (VCM) that applies the configuration of the driving mechanisms as disclosed in  FIGS. 1-32 , so that the angle of the light emitter D 5  and the light receiver D 6  can be appropriately adjusted to improve the efficiency of the optical sensing system. 
       FIG. 36  is a perspective diagram of an optical sensing system in accordance with another embodiment of the invention. As shown in  FIG. 36 , this embodiment is different from  FIG. 35  in that a first light path adjusting element RM 1  and a second light path adjusting element RM 2  are provided in the analyzing device V to guide the sensing light L into/out of the sensing module U. 
     As shown in  FIG. 36 , the light emitter D 5  emits the sensing light L to the first light path adjusting element RM 1 , and the first light path adjusting element RM 1  redirects the sensing light L to propagate through the first optical coupler PM 1  and into the light guide element WG. Subsequently, the sensing light L propagates through the light guide element WG and the second optical coupler PM 2  to the second light path adjusting element RM 2 , and the second light path adjusting element RM 2  guides the sensing light L to the light receiver D 6 . 
     In some embodiments, the light emitter D 5  and the first optical coupler PM 1  (or the light receiver D 6  and the second light path adjusting element RM 2 , or the light emitter D 5 , the light receiver D 6  and the first and second light path adjusting element RM 1  and RM 2 ) are arranged in a direction parallel to the light guide element WG for miniaturization of the optical sensing system. 
     In some embodiments, the first and second light path adjusting element RM 1  and RM 2  may comprise a prism or mirror that has a curved surface, and they may apply the configuration of the driving mechanisms as disclosed in  FIGS. 1-32 , so that they can be appropriately driven to rotate and efficiently guide the sensing light L to the light receiver D 6 . 
       FIG. 37  is a perspective diagram of an optical sensing system in accordance with another embodiment of the invention. As shown in  FIG. 37 , this embodiment is different from  FIG. 35  in that the first and second optical couplers PM 1  and PM 2  are omitted from the optical sensing system. Here, the light emitter D 5  and the light receiver D 6  are directly disposed on the top surface of the light guide element WG. In some embodiments, the light receiver D 6  may have a thickness larger than the light emitter D 5  to efficiently receive the sensing light L and facilitate miniaturization of the optical sensing system. 
     For example, the light emitter D 5  may comprise OLED, and the light receiver D 6  may comprise organic photodiodes (OPD), and both of them are directly formed on the top surface of the light guide element WG by a coating process. Thus, the sensing light L can directly enters the light guide element WG and prevent the positioning error between the light emitter D 5  and the light guide element WG. In some embodiments, a middle layer (not shown) may be formed between the light guide element WG and the light receiver D 6 , wherein the middle layer comprises a refractive index greater than the light guide element WG or ranged between the light guide element WG and the light receiver D 6 . In some embodiments, the middle layer may be integrally formed with the light receiver D 6  in one piece. 
       FIG. 38  is a perspective diagram showing the sensing light L propagates from the light emitter D 5  through the sensing module U to the light receiver D 6 .  FIG. 39  is a perspective diagram showing the light emitter D 5  is rotatable relative to the sensing module U.  FIG. 40  is a perspective diagram showing the light emitter D 5  and the light receiver D 6  are both rotatable relative to the sensing module U. 
     As shown in  FIG. 38 , the sensing light L is emitted from the light emitter D 5  through the sensing module U to the light receiver D 6 , wherein the light emitter D 5  and the light receiver D 6  may be disposed inside the analyzing device V or directly affixed to the light guide element WG of the sensing module U ( FIG. 37 ). 
     As shown in  FIG. 39 , the light emitter D 5  may be rotatable relative to the sensing module U by applying the driving mechanism DM 1  in  FIGS. 35 and 36 , so that the sensing light L can be successfully and efficiently guided into the light guide element WG. In some embodiments, as shown in  FIG. 40 , b the light emitter D 5  and the light receiver D 6  are both rotatable relative to the sensing module U by applying the driving mechanisms DM 1  and DM 2  in  FIGS. 35 and 36 , so that the light receiver D 6  can efficiently receive the sensing light L. 
       FIG. 41  is a perspective diagram showing the light emitter D 5  and the sensing module U are rotatable relative to the light receiver D 6 .  FIG. 42  is a perspective diagram showing the light receiver D 6  and the sensing module U are rotatable relative to the light emitter D 5 . 
     As shown in  FIG. 41 , the light emitter D 5  may be affixed to the sensing module U, and they can both rotate relative to the light receiver D 6  by applying the driving mechanisms as disclosed in  FIGS. 1-32 , so that light receiver D 6  can efficiently receive the sensing light L. 
     Similarly, as shown in  FIG. 42 , the light receiver D 6  may be affixed to the sensing module U, and they can both rotate relative to the light emitter D 5  by applying the driving mechanisms as disclosed in  FIGS. 1-32 , so that the sensing light L can be successfully and efficiently guided to the sensing module U. 
       FIG. 43  is a perspective diagram showing the first light path adjusting element RM 1  is rotatable relative to the sensing module U.  FIG. 44  is a perspective diagram showing the first and second light path adjusting elements RM 1  and RM 2  are both rotatable relative to the sensing module U. 
     As shown in  FIG. 43 , the first light path adjusting element RM 1  may be disposed in the analyzing device V for guiding the sensing light L to the sensing module U ( FIG. 36 ). Specifically, the first light path adjusting element RM 1  can rotate relative to the sensing module U or the light emitter D 5 . 
     Similarly, as shown in  FIG. 44 , the second light path adjusting element RM 2  may also be disposed in the analyzing device V for guiding the sensing light L to the light receiver D 6 , so that the light receiver D 6  can efficiently receive the sensing light L. 
     It should be noted that the sensing module U may comprise disposable material and is detachably connected to the analyzing device V. Hence, it could be easy to use and especially suitable in the field of point-of-care testing (POCT). 
       FIG. 45  is a schematic diagram of an optical member driving mechanism  100 , and  FIG. 46  is an exploded-view diagram of the optical member driving mechanism  100 . The optical member driving mechanism  100  can be mounted in a vehicle (such as a car or a motorcycle) or a portable device (such as a smart phone or a tablet computer), and can be electrically connected to a processer (not shown). The optical member driving mechanism  100  can emit light toward an object, and receive the light reflected by the object. The processor can calculate the profile of the object according to the time lag between emitting and receiving, or the data of luminous intensity of the received light. 
     As shown in  FIGS. 45 and 46 , the optical member driving mechanism  100  primarily includes a light emitter  110 , a light receiver  120 , and a rotation module  130 , wherein the light emitter  110  and the light receiver  120  are disposed on the rotation module  130 . The light emitter  110  emits light toward a direction away from the optical member driving mechanism  100  at a side  101  of the optical member driving mechanism  100 , and the light receiver  120  receives the same type light being emitted toward the optical member driving mechanism  100  at the same side  101 . For example, the light can be an infrared light, a white light, or a laser. 
     The rotation module  130  includes a fixed portion  131 , a movable portion  132 , and a driving assembly  133 . The fixed portion  131  can be a base, and the movable portion  132  can be a carrier. The movable portion  132  is movably connected to the fixed portion  131 . 
     As shown in  FIGS. 46 and 47 , in this embodiment, the movable portion  132  has a metal substrate  1321 , an insulation layer  1322 , and a wire layer  1323 . The insulation layer  1322  is disposed between the metal substrate and the wire layer  1323 . The light emitter  110  and the light receiver  120  are disposed on the insulation layer  1322  and electrically connected to the wire layer  1323 . 
     In this embodiment, the metal substrate  1321  is constituted by a flexible sheet spring, including at least one first engaged section  1321 A, at least one second engaged section  1321 B, and at least one string section  1321 C. The first engaged section  1321 A is affixed to the fixed portion  131 , the insulation layer  1322  is disposed on the second engaged section  1321 B, and the string section  1321 C connects the first engaged section  1321 A to the second engaged section  1321 B. Therefore, the light emitter  110  and the light receiver  120  can be suspended on the fixed portion  131  by the metal substrate  1321  of the movable portion  132 . 
     The driving assembly  133  includes at least one first electromagnetic driving member  1331 , at least one second electromagnetic driving member  1332 , and at least one magnetic permeability member  1333 . The first electromagnetic driving member  1331  is disposed on the fixed portion  131 . The second electromagnetic driving member  1332  is disposed on the movable portion and corresponds to the first electromagnetic driving member  1331 . The second engaged section  1321 B can be driven to move relative to the fixed portion  131  by the first electromagnetic driving member  1331  and the second electromagnetic driving member  1332 . 
     In detail, in this embodiment, the first electromagnetic member  1331  is a magnet, and the second electromagnetic member  1332  is a coil. When a current flows through the second electromagnetic member  1332 , an electromagnetic effect is generated between the first electromagnetic driving member  1331  and the second electromagnetic member  1332 , and the second engaged section  1321 B is driven to rotate around a first rotation axis  11  relative to the fixed portion  131 . 
     The magnetic permeability member  1333  is adjacent to the first electromagnetic member  1331  to enhance the magnetic pushing force. In some embodiments, the first electromagnetic member  1331  is a coil, and the second electromagnetic member  1332  is a magnet. 
     Since the light emitter  110  and the light receiver  120  are disposed on the second engaged section  1321 B, when the second engaged section  1321 B is driven to rotate, the light emitter  110  and the light receiver  120  rotate simultaneously. Therefore, the scanning range of the optical member driving mechanism  100  can be increased, and the situation that the reflected light cannot be received by the light receiver  120  due to the position can be reduced. 
     In this embodiment, the insulation layer  1322  and the second electromagnetic driving member  1332  are respectively disposed on opposite sides of the metal substrate  1321 . Furthermore, the light emitter  110  and the light receiver  120  are arranged along the first rotation axis  11 , so that the first rotation axis  11  passes through the light emitter  110  and the light receiver  120 . In some embodiments, the light emitter  110  and the light receiver  120  are respectively disposed on the different sides of the first rotation axis  11 , and the distance between the light emitter  110  and the first rotation axis  11  is substantially the same as the distance between the light receiver  120  and the first rotation axis  11 . 
     Referring to  FIGS. 48 and 49 , in another embodiment, an optical member driving mechanism  200  primarily includes a light emitter  210 , a light receiver  220 , and a rotation module. The light emitter  210  and the light receiver  220  are disposed on the rotation module  230 , and the rotation module  230  can drive the light emitter  210  and the light receiver  220  to rotate around a first rotation axis  21  and a second rotation axis  22 , wherein the first rotation axis  21  is perpendicular to the second rotation axis  22 . 
     The rotation module  230  includes a fixed portion  231 , a movable portion  232 , and a driving assembly  233 . The fixed portion  231  includes a base  2311  and a frame  2312 . The base  2311  is fixedly joined to the frame  2312 . The movable portion  232  includes a supporting member  2321  and a carrier  2322 . The movable portion  232  is movably connected to the fixed portion  231 . 
     Referring to  FIGS. 49-51 , in this embodiment, the carrier  2322  has a metal substrate  2324 , an insulation layer  2325 , and a wire layer  2326 . The insulation layer  2325  is disposed between the metal substrate  2324  and the wire layer  2326 . The light emitter  210  and the light receiver  220  are disposed on the insulation layer  2325  and electrically connected to the wire layer  2326 . 
     In this embodiment, the metal substrate  2324  is constituted by a flexible sheet spring, including at least one first engaged section  2324 A, at least one second engaged section  2324 B, and at least one string section  2324 C. The first engaged section  2324 A is affixed to the frame  2312 , the insulation layer  2325  is disposed on the second engaged section  2324 B, and the string section  2324 C connects the first engaged section  2324 A to the second engaged section  2324 B. Therefore, the light emitter  210  and the light receiver  220  can be suspended on the fixed portion  231  by the metal substrate  2324  of the movable portion  232 . 
     The supporting member  2321  is connected to the second engaged section  2324 B, and the second engaged section  2324 B is disposed between the supporting member  2321  and the insulation layer  2325 . The driving assembly  233  includes at least one first electromagnetic driving member  2331 A, at least one first electromagnetic driving member  2331 B, at least one second electromagnetic driving member  2332 A, at least one second electromagnetic driving member  2332 B, and a circuit board  2333 . The first electromagnetic driving members  2331 A and  2331 B are affixed to the supporting member  2321 , and respectively disposed on the different surfaces of the supporting member  2321 . The circuit board  2333  is clamped between the base  2311  and the frame  2312 . The second electromagnetic driving members  2332 A and  2332 B are disposed on the circuit board  2333 , and respectively corresponds the first electromagnetic driving members  2331 A and  2331 B through the openings  2313  of the frame  2312 . The second engaged section  2324 B can be driven to move relative to the fixed portion  231  by the first electromagnetic driving members  2331 A and  2331 B and the second electromagnetic driving members  2332 A and  2332 B. 
     In detail, in this embodiment, the first electromagnetic members  2331 A and  2331 B are magnets, and the second electromagnetic members  2332 A and  2332 B are coils. When a current flows through the second electromagnetic member  2332 A, an electromagnetic effect is generated between the first electromagnetic driving member  2331 A and the second electromagnetic member  2332 A, and the second engaged section  2324 B is driven to rotate around the first rotation axis  21  relative to the fixed portion  231 . When a current flows through the second electromagnetic member  2332 B, an electromagnetic effect is generated between the first electromagnetic driving member  2331 B and the second electromagnetic member  2332 B, and the second engaged section  2324 B is driven to rotate around the second rotation axis  22  relative to the fixed portion  231 . 
     In some embodiments, the first electromagnetic driving members  2331 A and  2331 B are coils, and the second electromagnetic members  2332 A and  2332 B are magnets. 
     Since the light emitter  210  and the light receiver  220  are disposed on the second engaged section  2324 B, when the second engaged section  2324 B is driven to rotate, the light emitter  210  and the light receiver  220  rotate simultaneously. Therefore, the scanning range of the optical member driving mechanism  200  can be increased, and the situation that the reflected light cannot be received by the light receiver  220  due to the position can be reduced. 
     The light emitter  210  and the light receiver  220  are arranged along the first rotation axis  21 , so that the first rotation axis  21  passes through the light emitter  210  and the light receiver  220 . Moreover, the light emitter  210  and the light receiver  220  are respectively disposed on the different sides of the second rotation axis  22 , and the distance between the light emitter  210  and the second rotation axis  22  is substantially the same as the distance between the light receiver  220  and the second rotation axis  22 . 
     Referring to  FIG. 52 , in another embodiment, an optical member driving mechanism  300  primarily includes two light emitters  310 , a light receiver  320 , and a rotation module  330 , wherein the structure of the rotation module  330  is the same as that of the rotation module  230 , so that the features thereof are not repeated in the interest of brevity. The light receiver  320  is disposed on the movable portion  332  of the rotation module  330 , and two light emitters  310  are disposed on opposite sides of the light receiver  320 . Owing to the rotation of the light receiver  320 , the scanning range of the optical member driving mechanism  300  can be increased. Furthermore, since the light receiver  320  can receive the reflected lights from two light emitters  310 , the profile of the object can be accurately calculated. 
     Referring to  FIG. 53 , in another embodiment, an optical member driving mechanism  400  primarily includes a light emitter  410 , two light receivers  420 , and a rotation module  430 , wherein the structure of the rotation module  430  is the same as that of the rotation module  230 , so that the features thereof are not repeated in the interest of brevity. The light emitter  410  is disposed on the movable portion  432  of the rotation module  430 , and two light receivers  420  are disposed on opposite sides of the light emitter  410 . The light receiving ranges of two light receivers  420  can be overlapped. Owing to the rotation of the light emitter  410 , the scanning range of the optical member driving mechanism  400  can be increased. 
     Referring to  FIG. 54 , in another embodiment, an optical member driving mechanism  500  primarily includes a light emitter  510 , two light receivers  520 , a rotation module  530 , and a reflecting member  540 , wherein the structure of the rotation module  530  is the same as that of the rotation module  230 , so that the features thereof are not repeated in the interest of brevity. 
     The reflecting member  540  can be a mirror or a prism, and can be disposed on the rotation module  530 . The light emitter  510  emits light  1000  toward the reflecting member  540 . After being reflected by the reflecting member  540 , the light  1000  moves toward the object in a particular direction  1001 . Two light receivers  520  are disposed on opposite sides of the reflecting member  540 . After being reflected by the object, the light  1000  can be received by two receivers  520 . 
     It should be noted that, as seen from the direction  1001 , the light emitter  510  overlaps one of the light receivers  520 , so as to save space. For example, the optical member driving mechanism  500  in this embodiment can be used in the vehicle, so as to save space between two receivers  520  to dispose other components. 
     Referring to  FIG. 55 , in another embodiment, an optical member driving mechanism  600  primarily includes a light emitter  610 , a light receiver  620 , a rotation module  630 , and a reflecting member  640 , wherein the structure of the rotation module  630  is the same as that of the rotation module  230 , so that the features thereof are not repeated in the interest of brevity. 
     The reflecting member  640  can be a mirror or a prism, and can be disposed on the rotation module  630 . The light emitter  610  emits light  1000  toward the reflecting member  640 , and the reflecting member  640  reflects the light  1000  to the object. After being reflected by the object, the light  1000  can be received by the receiver  620 . 
     Specifically, the light emitter  610 , the reflecting member  640 , and the light receiver  620  are arranged in a straight line  1002 , so that the thickness of the optical member driving mechanism  600  can be reduced. The optical member driving mechanism  600  can be used in the portable device. 
     In the aforementioned embodiments, when the light emitter is disposed on the rotation module, or the light is reflected by the reflecting member on the rotation module, the light being emitted toward the object may not shift horizontally due to the rotation. Therefore, as shown in  FIG. 56 , in some embodiments, a light path adjusting member  900  can be disposed on the rotation module  630  (or the rotation module  230 ,  330 ,  430  or  530 ). The light emitter  210  or  410  or the reflecting member  540  or  640  can be disposed on the light path adjusting member  900 . 
     Owing to the light path adjusting member  900 , the emission direction  1001  of the reflected light  1000  can be parallel or perpendicular to the second rotation axis  22 . The light being emitting toward the object can shift horizontally. 
     As shown in  FIG. 57 , in some embodiments, the direction of the magnetic pushing force of the driving assembly  233  can be changed to adjust the second rotation axis  22 . The second rotation axis  22  can be adjusted to be parallel or perpendicular to the emission direction  1001  of the reflected light  1000 , so that the light being emitted toward the object can shift horizontally. 
     In the aforementioned embodiments, the light emitter and the light receiver can be a fill light member (such as a flash) and an image sensor. 
     In summary, an optical member driving mechanism is provided, including a movable portion, a fixed portion, a driving assembly, at least one light emitter, and at least one light receiver. The driving assembly is configured to drive the movable portion to move relative to the fixed portion. The light emitter emits light toward an object, and the light receiver receives the light reflected by the object. 
     Although some embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. For example, it will be readily understood by those skilled in the art that many of the features, functions, processes, and materials described herein may be varied while remaining within the scope of the present disclosure. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, compositions of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps. Moreover, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements. 
     While the invention has been described by way of example and in terms of preferred embodiment, it should be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation to encompass all such modifications and similar arrangements.