Patent Publication Number: US-2013250283-A1

Title: Optical assembly

Description:
TECHNICAL FIELD  
     The present invention concerns an optical assembly that may sense a rotational position of an optical member, and more specifically, to an optical assembly having a position sensing unit using an optical sensor, which may sense a light-receiving characteristic according to the rotational position of the optical member to precisely control the rotational position of the optical member. 
     BACKGROUND ART 
     Optical apparatuses using light such as laser beams have wide industrial applications including medical industry. 
     Such an optical apparatus generally includes a light source for generating light and multiple optical members that are arranged on a path along which light emitted from the light source travels. At this time, each optical member is rotated and shifted in position, thereby modulating the characteristics of the light and changing the path of the light. 
     Among the optical members, some are controlled to be selectively rotated in the optical apparatus. As an example, a scanner is installed to reflect light that travels along a light path, and the light path is changed as the rotational position such as the direction and angle of rotation varies. 
     Such a conventional optical member is provided to be rotatable in the optical apparatus and requires a separate source to supply power, and this puts a restriction it being implemented in a small module. 
     Further, the rotational position and rotation speed of the optical member is difficult to control, thus making it difficult to provide the optical apparatus with higher accuracy. 
     DETAILED DESCRIPTION OF INVENTION 
     Technical Problems 
     To address the above problems, the present invention aims to provide an optical assembly that may control optical members more precisely and may be made compact with a source to supply power to the optical members. 
     Technical Solutions 
     To achieve the above objects, the present invention provides an optical assembly comprising an optical member, a supporter provided so that the optical member is rotated in a direction of a first axis, a second axis, or a combination of the first axis and the second axis, a power providing unit supplying power to rotate the optical member, and a position sensing unit including a plurality of light sensors, wherein the position sensing unit senses a rotational position of the optical member. And, the optical assembly may further comprise a controller controlling a driving of the power providing unit in accordance with the rotational position of the optical member that is sensed by the position sensing unit. 
     At this time, the optical assembly may further comprise at least one light source positioned at a lower side of the optical member and emitting light, wherein the position sensing unit senses the rotational position of the optical member based on the amount or position of light emitted from the light source. Here, a separate light shielding unit may be formed between the light source and the position sensing unit, wherein the light shielding unit selectively shields the position sensing unit in accordance with the rotational position of the optical member. 
     Specifically, the light source may be provided to emit light from a lower side of the optical member to an outer side of the optical member, the plurality of light sensors may be arranged corresponding to a direction in which light is emitted from the light source along an outer direction of the optical member, and the light shielding unit may be extended from a lower surface of the optical member to a lower side and rotates with the optical member to selectively shield the position sensing unit. 
     The supporter may include a first holder formed along a circumference of the optical member so that the optical member is rotatably provided in the first-axis direction and a second holder formed along a circumference of the first holder so that the optical member and the first holder are rotatably provided in the second-axis direction. 
     Or, the supporter may include a first holder hinge-coupled to a lower side of the optical member so that the optical member is rotatable in the first-axis direction and a second holder hinge-coupled to an end of the first holder so that the optical member and the first holder are rotatable in the second-axis direction. 
     The optical member may include a mirror and a mirror plate where the mirror is installed, and the mirror plate may include a magnetic body having a magnetic pole. And, the power providing unit may include a plurality of magnetic force units that generate a magnetic force and may provide power to rotate the optical member using the magnetic force. 
     Specifically, two magnetic force units that provide power to rotate the optical member along the first axis may be arranged on a line of the second axis with respect to the first axis, and two magnetic force units that provide power to rotate the optical member along the second axis may be arranged on a line of the first axis with respect to the second axis. 
     Advantageous Effects 
     According to the present invention, the optical members may be precisely controlled using the rotational position information of the optical members, and a compact structure may be provided that includes a position sensing unit and a power providing unit. Accordingly, the optical apparatus may be made small. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating an optical assembly according to a first embodiment of the present invention. 
         FIG. 2  is an exploded perspective view of the optical assembly shown in  FIG. 1 . 
         FIG. 3  is a cross-sectional view of the position sensing unit shown in  FIG. 1 . 
         FIG. 4  is a plan view of the position sensing unit shown in  FIG. 3 . 
         FIG. 5  is a view schematically illustrating an arrangement of the light sensors shown in  FIG. 3 . 
         FIG. 6  is a perspective view illustrating an optical assembly according to a second embodiment of the present invention. 
         FIG. 7  is a plan view of the optical assembly shown in  FIG. 6 . 
         FIG. 8  is a perspective view illustrating another example of the supporter shown in  FIG. 6 . 
         FIG. 9  is an exploded perspective view of the supporter shown in  FIG. 8 . 
         FIG. 10  is a perspective view illustrating still another example of the supporter sown in  FIG. 6 . 
         FIG. 11  is an exploded perspective view of the supporter shown in  FIG. 10 . 
         FIG. 12  is a cross-sectional view of the optical assembly shown in  FIG. 12 . 
         FIG. 13  is a cross-sectional view illustrating the polarity of the magnetic body of the optical member shown in  FIG. 6 . 
         FIGS. 14 and 15  are cross-sectional views illustrating the optical member that is rotated by the power providing unit shown in  FIG. 6 . 
     
    
    
     BEST MODE 
     An optical apparatus according to the present invention will be described in detail with reference to the drawings. The relationship in position between the components is described based on the drawings. For ease of description, the structures in the drawings may be simplified or exaggerated. However, the present invention is not limited as having the configurations described hereafter, and more components may be added, or some of the components may be modified or omitted. 
       FIG. 1  is a perspective view illustrating an optical apparatus according to a first embodiment of the present invention, and  FIG. 2  is an exploded perspective view of the optical apparatus shown in  FIG. 1 . 
     Referring to  FIGS. 1 and 2 , the optical assembly  10  according to this embodiment includes a power providing unit  200 , an optical member  100  provided at a side of the power providing unit  200 , and various components that are provided at the other side of the power providing unit  200  and sense the position of the optical member  100 . 
     The optical member  100  may be constituted of, e.g., a mirror. The optical member  100  is rotatably installed. Accordingly, the optical member  100  may control the rotational position while arranged on a path along which light travels to change the light path. In this embodiment, for example, the optical member  100  is a mirror. However, various optical elements may be used to constitute the optical member  100 . 
     The power providing unit  200  is provided at a side of the optical member  100  to supply power to rotate the optical member  100  to the optical member  100 . The power providing unit  200  may be, e.g., a forward/reverse rotation motor. The optical member  100  may be installed at a side of the power providing unit  200  and may be rotated along the rotational axis A of the power providing unit  200  as the power providing unit  200  is driven. In this embodiment, the power providing unit  200  may be a forward/reverse rotation motor that may rotate 30 degrees angle in the forward direction and reverse direction each. However, besides the forward/reverse rotation motor, various driving sources may be adopted to constitute the power providing unit  200 . 
     At the other side of the power providing unit  200  is formed a stage  310  that is arranged to be spaced apart from the power providing unit  200  by a predetermined distance. The stage  310  includes at least one light source  321  and a light sensor  331 . At this time, the light source  321  and the light sensor  331  may be arranged to face each other so that light emitted from the  321  may be received by the light sensor  331 . 
     Specifically, a plurality of light sensor supporters  330  are provided along the circumferential direction at the outer edge of the stage  310 . The light sensor supporter  330  may extend in a direction parallel with the rotational axis of the power providing unit  200  and may fix the stage  310  to a side of the power providing unit  200 . The light sensor  331  may be provided at an inside of the light sensor supporter  330  to be oriented towards the center of the stage  310 . 
     Meanwhile, as shown in  FIGS. 1 and 2 , a light source supporter  320  is provided at a central portion of the stage  310 . The light source supporter  320  is formed in a direction parallel with the rotational axis of the optical member  100  and may be positioned on an extension line of the rotational axis. At least one light source  321  is installed at the light source supporter  320  and emits light towards the light sensor  331  that is positioned at an outside portion. The light source  321  may include an IR LED (infra-red LED) or may include various types of light sources. 
     A light shielding unit  340  is positioned between the light source  321  and the light sensor  331  to selectively shield the light sensor  331 . Here, although the light shielding unit  340  is herein described as selectively shielding the light sensor  331 , from other points of view, it may be construed as selectively shielding the light source or as selectively shielding light emitted from the light source. 
     The light shielding unit  340  is connected to a rotating unit  350  of the power providing unit  200 . The rotating unit  350  is provided in the power providing unit  200  and is supported by a bearing unit  360 . The rotating unit  350  has the same rotational axis as the optical member  100 . As the optical member  100  is rotated by the power providing unit  200 , the rotating unit  350  also rotates in the direction in which the optical member  100  is rotated. Accordingly, the light shielding unit  340  may also be rotated with the optical member  100  while connected with the rotating unit  350 . 
     The light shielding unit  340 , as shown in  FIGS. 1 and 2 , is extended from the rotating unit  350  in an outside direction and is bent towards the light source supporter  320 . In other words, the light shielding unit  340  forms a blade structure  341 . Accordingly, as the light shielding unit  340  is rotated between the light source  321  and the light sensor  331 , the light shielding unit  340  selectively shields the light sensor  331  in accordance with the rotational position. In such case, the amount and position of light that is emitted from the light source  321  and received by the light sensor  331  are varied. Therefore, the rotational position of the optical member  100  may be sensed based on the variation in the amount and position of light received by the light sensor. 
       FIG. 3  is a cross-sectional view of the position sensing unit shown in  FIG. 1 , and  FIG. 4  is a plan view illustrating the position sensing unit shown in  FIG. 3 . 
     As shown in  FIGS. 3 and 4 , the position sensing unit  300  includes at least one light source  321 , at least one light sensor  331  for receiving light emitted from the light source  321 , and a light shielding unit  340  for selectively shielding the light sensor  331  between the light sensor  331  and the light source  321 . 
     As described above, the light shielding unit  340  is rotatably installed to correspond to the rotational position of the optical member  100 , and depending on the rotational position of the light shielding unit  340 , the amount and position of light received by the light sensor  331  are varied. Accordingly, the position sensing unit  300  may sense the rotational position of the optical member  100  based on the amount and position of light sensed by the light sensor. 
     At this time, the position sensing unit  300  may be preferably configured so that while the optical member  100  is on the move within a rotational trajectory, a part of light emitted from the light source  321  is shielded by the light shielding unit  340  and another part thereof is received by the light sensor  331 . If in a specific section the light sensor is fully shielded or not shielded by the light shielding unit, even when the optical member travels in the corresponding section, there would be no change in the amount or position of light received by the light sensor, thus making it difficult to catch the precise rotational position of the optical member. 
     Accordingly, in the instant embodiment, as shown in  FIG. 4 , the length in the circumferential direction of the light sensor  331  is rendered longer than the length in the circumferential direction of the light shielding unit  340 , so that part of light may be continuously received by the light sensor  331  in the rotational trajectory of the optical member  100 . For this purpose, two or more light sensors  331  may be sequentially arranged as illustrated in  FIG. 5 . 
     Meanwhile, in this embodiment, the light source  321  and the light sensor  331  are spaced apart from each other at an interval of 180 degrees in the circumferential direction. The light shielding unit  340  has two blades that may be arranged at an interval of 180 degrees in the circumferential direction. 
     However, this is merely an example, and the light source and the light sensor may also be arranged at an interval of 60 degrees or 90 degrees along the circumferential direction. In such case, as the rotational position of the optical member varies, multiple light sensors may be advantageously combined to obtain the amount and position of light that is continuously changed. Further, in case multiple light sensors are used, even when some light sensors positioned at certain positions are broken, the remaining light sensors may be combined to sense the rotational position of the optical member. 
     As such, the optical assembly  10  according to an embodiment of the present invention may precisely determine, in real time, the rotational position of the optical member  100  using the position sensing unit  300  including the light sensor  331 . Accordingly, a controller (not shown) that controls the driving of the power providing unit may perform real-time sensing on the rotational position of the optical member that is sensed by the position sensing unit  300  to control the driving, thus enabling precise position control on the optical member  100 . 
     However, although in this embodiment the position sensing unit has been configured using the stage feature that is installed at an end of the power providing unit, this is merely an example, and various configurations may be made so that the position may be sensed using the light-receiving information of the light sensor depending on the rotational position. 
     For example, although in the present embodiment the light source is provided at an inside and irradiates light to the light source that is provided along the circumference, the light source, in contrast, may be installed along the circumferential direction to radiate light to the light sensor that is provided inside. 
     Further, the blade of the light shielding unit may have a through-hole or groove with a predetermined pattern, so that the light sensor may sense the position of the through-hole or groove, which is changed, thereby sensing the rotational position of the optical member. 
     An optical assembly  1010  according to a second embodiment of the present invention is now described with reference to  FIGS. 6 to 15 . However, the configurations and functions similar to those in the above-described embodiment and similar-type variations are not described. 
       FIG. 6  is a perspective view illustrating an optical assembly according to a second embodiment of the present invention. The optical assembly  1010  according to this embodiment includes a frame  1500 , a supporter  1400  provided in the frame  1500 , an optical member  1100  provided to be rotatable by the supporter  1400 , and a power providing unit  1200  that supplies power to optical member  1100  to rotate the optical member  1100 . The optical apparatus further includes a position sensing unit  1300  for sensing the rotational position of the optical member  1100  that is rotated by the power providing unit  1200  and a controller (not shown) that controls the power providing unit  1200  in accordance with the rotational position of the optical member  1100  that is sensed by the position sensing unit  1300 . 
     Specifically, the frame  1500  forms the shape of the optical assembly  1010  and has various components therein. As illustrated in  FIG. 6 , the frame  1500  in this embodiment includes a base  1520  and a plurality of pillar members  1510  that are formed on the base  1520 . Although not shown in the drawings, a separate connecting part may be provided on the base  1520  to allow the optical apparatus to be installed in the optical apparatus. 
     The optical member  1100 , like in the above-described embodiment, may include a mirror shaped as a plate. The optical member  1100  may be rotatably installed in the supporter  1400 . Accordingly, it may be arranged on a path along which light travels to change the path of light that is reflected by a mirror as the optical member  1100  is rotated. However, in this embodiment, the mirror is used as an example of the optical member, but other various optical elements may be used as well. 
     The optical member  1100  is rotatably installed in the supporter  1400 . At this time, the optical member  1100  is configured to be rotatable in the direction of a first axis (X), a second axis (Y), and a combination thereof, while installed in the supporter  1400 . Accordingly, the optical member  1100  may be rotated in various directions and may form various paths of light that is reflected by the mirror. 
       FIG. 7  is a plan view of the optical apparatus shown in  FIG. 6 . As shown in  FIG. 7 , the optical member  1100  may be formed of a circular plate. The supporter  1400  includes a first holder  1410  that is arranged at an outer side along the circumference of the optical member  1100  and a second holder  1420  that is arranged at an outer side along the circumference of the first holder  1410 . 
     As shown in  FIG. 7 , the optical member  1100  is installed in the first holder  1410  of the supporter  1400 . In the first holder  1410  is provided a pair of first axis bearings  1411  in the first-axis direction. The optical member may be rotated along the first axis (X) while installed in the first holder  1410  by the first axis bearing  1411 . 
     The second holder  1420  is installed on the frame  1500 . In the second holder  1420  is provided a pair of second axis bearings  1421  in the second-axis direction. Accordingly, the first holder  1410  and the optical member  1100  may be rotated along the second axis (Y) while installed in the second holder  1420  by the second axis bearing  1421 . 
     As such, the optical member  1100  may be rotated in the first-axis (X) direction by the first axis bearing  1411  and may be rotated in the second-axis (Y) direction by the second axis bearing  1421 . Further, the optical member  1100  may be rotated in the direction of a combination of the first axis and the second axis using the first axis bearing  1411  and the second axis bearing  1421 . Here, since the first axis and the second axis form directions perpendicular to each other, the mirror of the optical member  1100  may change the path of light reflected in various two-dimensional ways. 
     However, in this embodiment, the supporter that supports the optical member using the first holder  1410  and the second holder  1420  is described above as an example. However, the supporter may be configured in various manners. 
     As another example, as shown in  FIGS. 8 and 9 , a supporter uses a pillar structure having two or more hinge members. 
     Specifically, the supporter of the optical member includes a first supporting member  1430  in which the optical member is installed and a second supporting member  1440  in which the first supporting member  1430  is installed. The first supporting member  1430  has a hinge shaft that is positioned in the first-axis direction, so that the optical member  1100  may be rotated in the first-axis direction while installed in the first supporting member  1430 . The second supporting member  1440  has a hinge shaft that is placed in the second-axis direction, so that the optical member  1100  and the first supporting member  1430  may be rotated in the second-axis direction while installed in the second supporting member. Accordingly, the optical member  1100  may be rotated in the direction of the first axis, the second axis, and a combination thereof using the supporter. 
     As another example, the supporter  1400  may be configured as shown in  FIGS. 10 and 11 . In  FIGS. 10 and 11 , the supporter has a pillar structure with a ball bearing  1400   a.    
     Specifically, the optical member  1100  is installed at an end of the supporter  1400 , and the end of the supporter  1400  where the optical member  1100  is installed has a ball bearing  1400   a.  Accordingly, the optical member  1100  is inserted into the ball bearing  1400   a  and may thus be freely rotated in all directions. 
     The supporter according to an embodiment and two more different embodiments have been described thus far. Other various structures may be applicable to the optical member. 
     Meanwhile,  FIG. 12  is a cross-sectional view of the optical apparatus shown in  FIG. 6 . As shown in  FIG. 6 , the power providing unit  1200  is provided at a lower side of the optical member  1100 . Here, the power providing unit  1200  includes a plurality of magnetic force units  1210  that generates a magnetic force and supplies the magnetic force to the optical member  1100  for rotation of the optical member  1100 . An optical member and a driving method by a power providing unit according to the present invention are hereinafter described in greater detail with reference to  FIGS. 13 and 14 . 
     As shown in  FIG. 12 , an optical member  1100  includes a mirror  1110 , a mirror plate  1120 , and a magnetic body  1130 . The mirror  1110  is exposed from an upper surface of the mirror plate  1120  to be able to change the direction in which light travels on a light path. 
     The mirror plate  1120  is configured in a plate structure where the mirror  1110  may be seated and installed. At a lower side of the mirror plate  1120  is formed the magnetic body  1130 . In  FIG. 13 , a separate magnetic body  1130  is placed in the mirror plate  1120 . However, the mirror plate itself may be formed of the magnetic body  1130 . Thus, the optical member  1100  may be rotated using a magnetic force that is supplied from the magnetic force unit  1210  of the power providing unit  1200 . 
     At this time, the magnetic body  1130  of the mirror plate  1120  may be, e.g., a permanent magnet. Such a permanent magnet, as shown in  FIG. 13(   a ), may have different polarities depending on the position of a lower surface. Or, as shown in  FIG. 13(   b ), the permanent magnet may have different polarities at its upper and lower sides, respectively. 
     Therefore, the power providing unit  1200  has a plurality of magnetic force units  1210  at a lower side of the optical member  1100 , and the magnetic force units  1210  may provide a magnetic force corresponding to a magnetic-pole pattern of the magnetic body to rotate the optical member  1100 . 
     In  FIGS. 14 and 15 , the power providing unit rotates the optical member along the first and second axes. As shown in  FIGS. 14 and 15 , the whole lower surface of the optical member  1100  forms S magnetic pole. Here, each magnetic force unit  1210  forms an S magnetic pole, so that a repulsive force is provided to the optical member  1100  as a rotational force. 
       FIG. 14  illustrates an example where the optical member  1100  is rotated about the first axis. The magnetic force units  1210  that provide a force to allow the optical member  1100  to be rotated about the first axis are symmetrical to each other with respect to the first axis. The two magnetic force units  1210  generate repulsive forces with different strengths. In  FIG. 14   a , the left-hand magnetic force unit forms a larger magnetic force than that formed by the right-hand magnetic force unit, so that the optical member  1100  maintains equilibrium in magnetic force after rotating a predetermined angle about the first axis. 
       FIG. 15  shows the optical member  1100  that rotates with respect to the second axis. The magnetic force units  1210  that supply power to rotate the optical member  1100  about the second axis are symmetrical to each other with respect to the second axis. The two magnetic force units likewise generate repulsive forces with different strengths. In  FIG. 14   b , the left-hand magnetic force unit forms a larger magnetic force than that formed by the right-hand magnetic force unit, so that the optical member  1100  and the first holder  1410  rotate a predetermined angle about the second axis and then maintain equilibrium in magnetic force. 
     As such, the magnetic force units  1210  of the power providing unit  1200  may be configured so that the magnetic force generated from each of the magnetic force units  1210  may be independently controlled by the controller. Accordingly, the strength of each magnetic force unit may be individually controlled so that the optical member  1100  may be rotated in the direction of the first axis, the second axis, and a combination thereof. 
     In this embodiment, four magnetic force units  1210  are used and the magnetic force units  1210  are spaced apart from each other at the interval of 90 degrees along the circumferential direction of the optical member  1100 . Each magnetic force unit  1210  may be arranged to be adjacent to an edge of the optical member  1100  considering moment. 
     Here, two magnetic force units that provide power to rotate the optical member  1100  along the first axis (X) may be positioned on the second axis (Y) and may be symmetrical to each other with respect to the first axis. Two magnetic force units that provide power to rotate the optical member  1100  along the second axis (Y) may be positioned on the first axis (X) and may be symmetrical to each other with respect to the second axis (refer to  FIG. 6 ). 
     However, the present invention is not limited as having the arrangement of the magnetic force units according to this embodiment, and various arrangement patterns may be adopted. In this embodiment, the repulsive forces between two magnetic force units are used to rotate the optical member. However, two or more magnetic force units may be combined to rotate the optical member, and attractive forces, as well as repulsive forces, may also be used to maintain magnetic force equilibrium. 
     Meanwhile, as the optical member is rotated by the power providing unit, the position sensing unit  1300  senses the rotational position of the optical member  1100 . At this time, the position sensing unit  1300  may include a light source  1311 , a light sensor  1321 , and a light shielding unit  1330  that are installed in the optical assembly  1010 . 
     As shown in  FIG. 12 , the light source supporter  1310  is formed at a lower side of the optical member  1100 . The light source  1311  is installed in the light source supporter  1310  and illuminates light from an inner side to an outer side. 
     A plurality of light sensor supporters  1320  is formed at the outer side of the light source supporter  1310 . The plurality of light sensors  1321  are installed in the light sensor supporters  1320 . At this time, the light sensor  1321  is installed to face the light source  1311  at a position corresponding to the light source and receives light from the light source  1311 . 
     Meanwhile, a light shielding unit  1330  is positioned between the light source  1311  and the light sensor  1321  to selectively shield the light sensor  1321 . Here, although “the light shielding unit selectively shields the light sensor,” from other points of view, it may also be interpreted as the light shielding unit selectively shielding the light source or light emitted from the light source. 
     The light shielding unit  1330  is provided to interwork with the rotation of the optical member  1100 . Accordingly, as the optical member  1100  rotates, the light shielding unit  1330  moves, thus varying the amount and position of light that is emitted from the light source  1311  and received by the light sensor  1321 . Thus, the position sensing unit  1300  may sense the rotational position of the optical member  1100  by detecting the amount and position of light sensed by the light sensor  1321 . 
     Specifically, the light shielding unit  1330  includes at least one extension that is extends to a lower side of the optical member  1100 . In this embodiment, the optical member includes four extensions that are arranged to be spaced apart from each other at the interval of 90 degrees. Each extension may be positioned at a lower side of the first axis bearing  1411  and the second axis bearing  1421 . Therefore, the light shielding unit  1330  moves as the optical member  1100  rotates, selectively shielding the light sensor  1321 . 
     In this embodiment, four light sensor supporters  1320  are provided and are spaced apart from each other at the interval of 90 degrees along the circumference of a lower side of the optical member  1100 . At this time, each light sensor supporter  1320  may be positioned at a lower side of the first axis bearing  1411  and the second axis bearing  1421 . 
     The light sensor  1321  is installed in the direction of the light source  1311  in each light sensor supporter  1320 . At this time, the light sensor  1321  is preferably configured so that a part of light emitted from the light source is shielded and another part of the light is received while the light shielding unit  1330  moves as the optical member  1100  rotates. If in a specific section the light shielding unit fully shields or does not shield the light sensor, even when the optical member rotates in the corresponding section, there is no change in the amount or position of light received by the light sensor, thus making it difficult to catch the precise rotational position of the optical member. 
     Accordingly, in this embodiment, a plurality of light sensors  1321  are provided in one light sensor supporter  1320  along the longitudinal direction, so that a part of light remains shielded in the trajectory along which the light shielding unit  1330  travels while another part of the light may be continuously received. 
     As such, the position sensing unit  1300  according to this embodiment may precisely sense the rotational position of the optical member  1100  by combining the amount and position of light received by the plurality of light sensors  1321  provided in the plurality of light sensor supporters  1320  as the rotational position of the optical member  1100  varies, through the light sensors  1321 . 
     A controller (not shown) may receive, in real time, the rotational position information of the optical member  1100  that is sensed by the position sensing unit  1300  and may control the power providing unit  1200 , thus allowing for accurate position control on the optical member  1100 . Accordingly, such an optical apparatus may be used in various laser equipment such as medical or surgery devices using laser, which requires the position of light illumination to be accurately controlled. 
     Although in this embodiment the specific configurations and positions of the light sensor, light source, and light shielding unit are adopted for convenience of description, the present invention is not limited thereto. As mentioned above in connection with the above-described embodiments, the configuration of the position sensing unit according to the present invention may be modified in various manners with the light sensor, light source and light shielding unit changed in design in light of various positions and structures.