Abstract:
A system of angular displacement control for micro mirrors includes a stationary vertical element, a stationary horizontal element and an interference eliminator. Alternatively, the stationary horizontal element holds micro mirrors in place during transportation for avoiding vibration and collision. The stationary vertical element orientates the micro mirrors in the vertical position. The interference eliminator eliminates magnetic interference that could affect the operation of the micro mirrors. The micro mirrors having interference eliminators are capable of remaining unaffected by operations of other micro mirrors.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to an optical switch device that controls the angular displacement of micro mirror structures, eliminates the interference of magnetic field from other optical switch device and controls the horizontal displacement of micro mirror structures to prevent vibration and collision in the optical switch device transportation. Further, the present invention is directed to control the displacement and eliminate the interference of micro mirror structures or a plurality of optical switch devices. Alternatively, the present invention also improves the reliability of transporting optical switch devices.  
           [0003]    2. Description of the Related Art  
           [0004]    Recently several researchers have spurred an increasing development of microstructures in optical communication and micro electromechanical systems (MEMS). The microstructures that were not performed in the past are fabricated by a combination of silicon deposition, surface micromachining and bulk-micromachining. A typical optical communication system requires a number of small-sized, high-speed, and highly reliable optical switches for the line switching operation in any applications. The optical switch devices are discussed in detail in Transducers, 1995, entitled “An electrostatically operated torsion mirror for optical switching device” by Hiroshi Toshiyoshi and Hiroyuki Fujita and in Solid-state sensor and actuator, 1998, entitled “Parallel assembly of hinged microstructures using magnetic actuation” by Yang Yi and Chang Liu. Recently, U.S. Pat. Nos. 6,094,293 and 5,960,132 have been disclosed the related information.  
           [0005]    The optical switch devices as mentioned previously use electrostatic or magnetic force to control the angular displacement of individual mirror. The incident light is transmitted and passed only when mirror is in the non-reflection state (OFF-state). On the other hand, the incident light is reflected and changed the origin route when the mirror moves between the non-reflection state and the reflection state (On-state). A problem associated with the typical optical switch devices is that precision alignment of mirror is required to control the reflective light&#39;s route. The mirror achieves large angular displacements (over 90°) under a torque provided by applying an external magnetic or electrostatic force because the mirror is influenced by the inertia.  
           [0006]    [0006]FIG. 1 and FIG. 2 show the 3D views and cross-section views of the micro mirror in the prior art. A torsion mirror device  10  is formed on a flat surface of a silicon substrate  11  (or glass substrate). The torsion mirror device  10  includes a bump  15 , a reflective mirror  14  and a torsion bar  121  connected the reflective mirror  14  with the first connector section  12   a  and the second connector section  12   b.    
           [0007]    Alternatively, first connector section  12   a , second connector section  12   b , the torsion bar  121 , the reflective mirror  14 , and the bump  15  are formed by the elastic poly-silicon in the lithography process. The first connector section  12   a  and second connector section  12   b  are performed on the silicon substrate  11  and separated by the torsion bar  121 . The reflective mirror  14  is formed on the extension part of the middle of the torsion bar  121 . A magnetic material  141  (so called permalloy) is performed on the top of the reflective mirror  14 . The permalloy  141  is deposited by the way of sputtering or electroplating. The reflective mirror  14  contains a reflective area  142 . The reflective area  142  is performed by a smooth plane, which makes the incident light to change the route of the incident light when the incident light approaches the reflective area  142 . The bump  15  fixed under the reflective mirror  14  is a square or a rectangle. Furthermore, the height of the bump  15  is suitable for the reflective mirror  14  placed on the bump  15  when the reflective mirror  14  is in the horizontal level. An actuator  16  under the silicon substrate  11  could provide repulsive force to raise the reflective mirror  14 .  
           [0008]    The conventional rotation mechanism of the reflective mirror  14  is introduced in FIGS.  3 - 5 . As shown in FIG. 3, the torsion mirror device  10  is at rest and the external magnetic field is just applied to the actuator  16 . FIG. 4 shows that a torque provided by the actuator  16  makes the torsion mirror device  10  rotate from the horizontal level to vertical level. Thereafter, FIG. 5 shows that the torsion mirror device  10  achieves large angular displacements (over 90°) and doesn&#39;t keep stable at the vertical position under the influence of the inertia.  
           [0009]    As shown in FIG. 3, when the actuator  16  applying magnetic field results in flux density  161  and the permalloy  141  induces magnetization  163 . The positive pole of the flux density  161  and the positive pole of the magnetization  163  result in repulsive force  164 . The repulsive force  164  raises the reflective mirror  14  away from silicon substrate  11 . Alternatively, the torsion bar  121  which connects with the reflective mirror  14 , first connector section  12   a  and second connector section  12   b . When the reflective mirror  14  rotates from the horizontal level to the vertical level, the torsion bar  121  is provided with elasticity to distort under the repulsive force  164 . Furthermore, the repulsive force  164  achieves the maximum when the distance between the positive pole of the flux density  161  and the positive pole of the magnetization  163  is shortest.  
           [0010]    As shown in FIG. 4, the repulsive force  164  achieves smaller when the distance between the positive pole of the flux density  161  and the positive pole of the magnetization  163  is farther. The torsion bar  121  is so elastic that the reflective mirror  14  moves forward to the vertical position.  
           [0011]    As shown in FIG. 5, when the reflective mirror  14  approaches the vertical position, the distance between two positive poles increases further and the repulsive force  164  decreases substantially. The repulsive force  164  approaches zero when the reflective mirror  14  is at a vertical position  17 . In the influence of the inertia, the reflective mirror  14  stops at a static position  18  after the orientation mirror  14  rotates over the vertical position  17 . The repulsive force  164  is continuously applied to retain the reflective mirror  14  at the static position  18 .  
           [0012]    [0012]FIG. 6 illustrates a cross-section view that the conventional mirror device stays at the static position  18 . Although the actuator  16  is not provided by applying external magnetic field anymore, the induced magnetic filed of the permalloy  141  disappears and the reflective mirror  14  influenced by resilience moves back to horizontal level form the static position  18 . FIG. 7 shows a cross-section view that the conventional torsion mirror device  10  moves back to the horizontal level. A problem with a reflective mirror  14  similarly described above is that the reflective mirror  14  couldn&#39;t retain the horizontal level for the inertia when the reflective mirror  14  moves back. The bump  15  overcomes the problem because the height of the bump  15  is suitable for the reflective mirror  14  stopped on the bump  15 .  
           [0013]    As shown in FIG. 7, the torsion mirror device  10  isn&#39;t fixed by the bump  15  in the horizontal level when the torsion mirror device  10  or an array of torsion mirror devices is transported.  
           [0014]    [0014]FIG. 8 illustrates the cross-section view of an array of torsion mirror devices  20  in prior art. The array of torsion mirror devices  20  are composed by the sixteen micro mirrors labeled  211 ,  212 ,  213 ,  214 ,  221 ,  222 ,  223 ,  224 ,  231 ,  232 ,  233 ,  234 ,  241 ,  242 ,  243  and  244 . Among these mirrors, the mirrors labeled  213 ,  221 ,  232  and  244  are in the vertical level (reflective state), and therefore beams of incident light  20 A,  20 B,  20 C and  20 D are individually reflected by the mirrors labeled  213 ,  221 ,  232  and  244  to sensors of  20 E,  20 F,  20 G and  20 H. The other mirrors labeled  211 ,  212 ,  214 ,  222 ,  223 ,  224 ,  231 ,  233 ,  234 ,  241 ,  242  and  243  are set to in the horizontal level. Alternatively, the actuators of the mirrors labeled  213 ,  221 ,  232  and  244  are provided by the external magnetic field to retain the mirrors in the vertical level. The other problem is that the actuators described above influence some of the mirrors labeled  211 ,  212 ,  214 ,  222 ,  223 ,  224 ,  231 ,  233 ,  234 ,  241 ,  242  and  243  so that these mirrors don&#39;t retain in the horizontal level. Prior art array of torsion mirror devices  20  could not operate properly if incident or reflective light is obstructed by mirrors not remaining in horizontal position. The present invention proposes an interference eliminator to resolve the above-mentioned problems.  
         SUMMARY OF THE INVENTION  
         [0015]    According, it is a primary object of the present invention is to provide a torsion mirror device or an array of torsion mirror devices, which can positively be retained in the vertical level.  
           [0016]    It is another object of the present invention is to provide a torsion mirror device or an array of torsion mirror devices, which can positively be retained in the horizontal level.  
           [0017]    It is yet another object of the present invention is to provide a torsion mirror device with function of eliminating magnetic interference, which comes from other torsion mirror device.  
           [0018]    To achieve these objects, a system of angular displacement control for micro mirror includes a stationary vertical element, a stationary horizontal element and an interference eliminator. Alternatively, the stationary horizontal element fixes micro mirrors in the transportation to avoid vibrating and colliding. The stationary vertical element orientates the micro mirrors in the vertical position. The interference eliminator eliminates from magnetic interference affecting the operation of the micro mirrors. The micro mirrors with interference eliminators aren&#39;t affected by other micro mirrors in the operation process. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0019]    [0019]FIG. 1 is a the 3D views and top views of the torsion mirror device  10  in the prior art;  
         [0020]    [0020]FIG. 2 is a cross-section view of the conventional torsion mirror device  10  shown in FIG. 1;  
         [0021]    [0021]FIG. 3 is a cross-section view of the conventional torsion mirror device  10  shown in the horizontal level;  
         [0022]    [0022]FIG. 4 is a cross-section view of the conventional torsion mirror device  10  shown rotating from the horizontal level to the vertical level;  
         [0023]    [0023]FIG. 5 is a cross-section view of the conventional torsion mirror device  10  which rotates at the static position  18 ;  
         [0024]    [0024]FIG. 6 is a cross-section view of the conventional torsion mirror device  10  which rotates at the static position  18 ;  
         [0025]    [0025]FIG. 7 is a cross-section view of the conventional torsion mirror device  10  shown rotating to the horizontal level;  
         [0026]    [0026]FIG. 8 is a top view of the conventional array of the micro mirror;  
         [0027]    [0027]FIG. 9 is a 3D and top view of the torsion mirror device  3  of the first exemplary embodiment;  
         [0028]    [0028]FIG. 10 is a cross-section view of the torsion mirror device  3  of the first exemplary embodiment;  
         [0029]    [0029]FIG. 11 is a cross-section view of the stationary vertical element  40  of the first exemplary embodiment;  
         [0030]    [0030]FIG. 12 is a cross-section view of the stationary vertical element  40  of the first exemplary embodiment moving from the horizontal level to the vertical level;  
         [0031]    [0031]FIG. 13 is a cross-section view of the stationary vertical element  40  of the first exemplary embodiment in the vertical level;  
         [0032]    [0032]FIG. 14 is a top view of the stationary horizontal element  50  in the electric conductive state of the first embodiment;  
         [0033]    [0033]FIG. 15 is a top view of the stationary horizontal element  50  in the nonconductive state of the first embodiment;  
         [0034]    [0034]FIG. 16 is a cross-section view of the interference eliminator  60  of the first exemplary embodiment;  
         [0035]    [0035]FIG. 17 is the 3D view of a stationary vertical element  70  of the second exemplary embodiment;  
         [0036]    [0036]FIG. 18 is a 3D view of the stationary vertical element  70  of the second exemplary embodiment moving to the vertical level;  
         [0037]    [0037]FIG. 19 is a 3D view of the stationary vertical element  70  of the second exemplary embodiment in the vertical level; and  
         [0038]    [0038]FIG. 20 is a cross-section view of the stationary vertical element  40  of the second exemplary embodiment in the vertical level. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0039]    A torsion mirror device crossconnect apparatus of the present invention is hereinafter described. One of ordinary skill in the art would appreciate that the description of the torsion mirror device of the present invention is described by way of example only and that other types of optical switch devices could be used to provide similar features and advantages.  
         [0040]    A torsion mirror device  3  is introduced in the present invention to solve the problems described in the related art individually. A torsion mirror device  3  is formed with a stationary vertical element  40 , a stationary horizontal element  50  and an interference eliminator  60   
         [0041]    [0041]FIG. 9 and FIG. 10 illustrate the 3D views and the top view of the torsion mirror device  3  of the present invention. The first embodiment of the stationary vertical element  40  of the present invention is on a flat surface of a silicon substrate  41 (or glass substrate). The stationary element  40  performed by the lithography process includes a bump  45 , an actuator  46 , a reflective mirror  44 , an orientation mirror  43 , the first connector section  42   a , the second connector section  42   b , the first torsion bar  421  and the second torsion bar  422 . The bump  45 , the first connector section  42   a , the second connector section  42   b , the first torsion bar  421 , the second torsion bar  422 , the orientation mirror  43  and the reflective mirror  44  are fabricated from a stiff yet resilient material such as polysilicon-based materials in the photolithography process. Furthermore, the first connector section  42   a  and second connector section  42   b  are performed on the silicon substrate  41  and separated by the first torsion bar  421  and the second torsion bar  422 . The first torsion bar  421  is parallel to the second torsion bar  422 . The orientation mirror  43  is formed on the extension part of the middle of the first torsion bar  421  and the reflective mirror  44  is formed on the extension part of the second torsion bar  422 . Furthermore, the orientation mirror  43  is opposite to the reflective mirror  44 .  
         [0042]    A magnetic material  141  (so called permalloy) is performed on the top of the reflective mirror  14 . The permalloy  141  and the permalloy  142  deposited by the way of sputtering or electroplating are separated on the orientation mirror  43  and the reflective mirror  44 . Alternatively, the reflective mirror  44  also contains a reflective area  442  which is a reflective area with equivalent height to change the route of the incident light. The bump  45  under the reflective mirror  14  is a square or a rectangle is fixed on the silicon substrate  41 . Furthermore, the height of the bump  45  is suitable for the reflective mirror  44  placed on the bump  45  when the reflective mirror  44  is in the horizontal level. The actuator  46  under the silicon substrate  41  provides the repulsive force to move the reflective mirror  44 .  
         [0043]    [0043]FIG. 11, FIG. 12 and FIG. 13 illustrate the stationary vertical element  40  in the first embodiment of the present invention. As shown in FIG. 11, the stationary vertical element  40  is at rest and the external magnetic field is just applied to the actuator  16 . FIG. 12 illustrate that a torque provided by the actuator  46  makes the stationary vertical element  40  rotate from the horizontal level to vertical level. Thereafter, FIG. 13 illustrates that the stationary vertical element  40  achieves in the vertical level.  
         [0044]    As shown in FIG. 11, FIG. 12 and FIG. 13, when the actuator  46  applying magnetic field results in flux density  461  and the permalloy  441  induces magnetization  463 . The positive pole of the flux density  461  and the positive pole of the magnetization  463  result in repulsive force  443 . The repulsive force  443  raises the reflective mirror  44  away from silicon substrate  41 . As same principle shown in FIG. 3, FIG. 4 and FIG. 5, the repulsive force  164  is induced by actuator  16  and the permalloy  141  in ordinary skill in the art. The importance of present invention discloses that the stationary vertical element  40  also contains the first torsion bar  421 , the orientation mirror  43  to fix the reflective mirror  44  in the vertical level.  
         [0045]    As shown in the FIG. 11, when the actuator  46  applying magnetic field results in flux density  461  and the permalloy  431  induces magnetization  462 . The positive pole of the flux density  462  and the positive pole of the magnetization  462  result in the first repulsive force  433 . Thereafter, the first repulsive force  433  rotates orientation mirror  43  from the horizontal level to the vertical level. The permalloy  441  induces magnetization  463  in the flux density  461  simultaneously. The positive pole of the flux density  461  and the positive pole of the magnetization  463  result in the second repulsive force  443 . The second repulsive force  443  rotates the reflective mirror  44  from the horizontal level to the vertical level. Furthermore, the first repulsive force  433  achieves the maximum when the distance between the positive pole of the flux density  461  and the positive pole of the magnetization  462  is shortest. In the same way, the second repulsive force  443  achieves the maximum when the distance between the positive pole of the flux density  461  and the positive pole of the magnetization  463  is shortest.  
         [0046]    As shown in FIG. 12, the orientation mirror  43  and the reflective mirror  44  rotate form the horizontal level to the vertical level individually when the first repulsive force  433  and the second repulsive force  443  act. Besides, the first repulsive force  433  and the second repulsive force  443  achieve smaller when the distance between two magnetic fields is farther. Thereafter, the first torsion bar  421  and the second torsion bar  422  are so elastic that the orientation mirror  43  and the reflective mirror  44  move forward to the vertical position. It is deserved to be mentioned that the orientation mirror  43  moves faster than the reflective mirror  44  because the orientation mirror  43  has less mass than the reflective mirror  44 .  
         [0047]    As shown in FIG. 13, when the orientation mirror  43  approaches the vertical position, the distance between two positive poles increases further and the first repulsive force  443  influencing the orientation mirror  43  decreases substantially. The first repulsive force  443  approaches zero when the orientation mirror  43  is at the vertical position  17 . In the influence of the inertia, the orientation mirror  43  stops after the orientation mirror  43  rotates over the vertical position  17 . The reflective mirror  44  rotates after the orientation mirror  43 . The rotation situation of the reflective mirror  44  is as same as the orientation mirror  43 . Alternatively, the first repulsive force  443  approaches zero when the reflective mirror  44  is at the vertical position  47 . The problem that the reflective mirror  44  rotates over the vertical position  47  is resolved by the existence of the orientation mirror  43 . The inertia formed by the orientation mirror  43  and the inertia formed by the reflective mirror  44  cancel out so that the reflective mirror  44  and the reflective mirror  44  touch each other and stop at the vertical position  47 . Alternatively, the factors which influences the reflective mirror  44  is in the vertical level are the mass and the torque of the orientation mirror  43  compared with the reflective mirror  44  and the axle arm and the resilience of the first torsion bar  421  compared with the second torsion bar  422 . The stationary vertical element  40  is optimized through the material selection, and experiment. Laser beams from different directions are reflected by the reflective mirror  44  and then reach expectant sensors in order to check if the reflective mirror  44  is in the vertical level.  
         [0048]    [0048]FIG. 14 illustrates the top view of the stationary horizontal element  50  in the electric conductive state of the first embodiment. FIG. 15 illustrates the top view of the stationary horizontal element  50  in the nonconductive state of the first embodiment. The stationary horizontal element  50  includes the first electrode  52   a , the second electrode  52   b , the first axle arm  521 , the second axle arm  522 , a connective axle arm  523  and a tenon  53 . Alternatively, the mirror includes a bulge  47  with corresponding the tenon  53 . The first electrode  52   a , the second electrode  52   b , the first axle arm  521 , the second axle arm  522 , the connective axle arm  523 , the tenon  53  and the bulge  47  are fabricated from a conductive material such as copper alloy or aurum alloy in the photolithography process. Furthermore, the first electrode  52   a  and second electrode  52   b  are performed on the silicon substrate  41  and separated by a suitable distance. The first axle arm  521  and second axle arm  522  are parallel to each other or approximately parallel. The second axle arm  522  is thicker than the first axle arm  521 . Alternatively, the first axle arm  521  and the second axle arm  522  are in the suspension mode. An end of the first axle arm  521  is fixed on the first electrode  52   a  and the other end is fixed on the connective axle arm  523 . An end of the second axle arm  522  is fixed on the first electrode  52   b  and the other end is also fixed on the connective axle arm  523 . As mentioned previously, the connective arm  523  connects the first axle arm  521  and the second axle arm  522  to form a horizontal suspension circuit.  
         [0049]    As shown in FIG. 13, the orientation mirror  43  is in the vertical state and then the control program sends commands to quit the power of the actuator  46 . The first permalloy and the second permalloy  441  stop to induce magnetization. The first repulsive force  433  and the second repulsive forcer  443  don&#39;t operate any more. The orientation mirror  43  and the reflective mirror  44  individually move form the vertical level to the horizontal level under the resilience of the first torsion bar  421  and the second torsion bar  422 . The bump  45  cancels the inertia of the rotation and stops the reflective mirror  44  from rotating over the horizontal level. The stationary horizontal element  50  forms the horizontal suspension circuit between the first electrode  52   a  and the second electrode  52   b . The circuit of the first axle arm  521 , the connective axle arm  523  and the second axle arm  522  are performed by the same metal material with the same coefficient of expansion. When the circuit is in the conductive state, the larger area of the second axle arm  522  results in lower resistance and lower temperature than the first axle arm  521 . The thermal expansion volume of the second axle arm  521  should be larger than the first axle arm  522 . In the same way, the length of the second axle arm  521  increases larger than the first axle arm  522  in the conductive state as shown in FIG. 15. Thereafter, the first axle arm  521  and the second axle arm  522  are bent to the right hand side. Alternatively, the influence of the thermal expansion in the first axle arm  521  is much stronger than the second axle arm  522  so that the influence in the second axle arm  522  is ignored.  
         [0050]    When the reflective mirror  44  is static in the horizontal level and the stationary horizontal element  50  is in the conductive state, the control program sends commends to quit the power of the horizontal suspension circuit. As shown in FIG. 15, the resistance, the temperature increase and thermal expansion in the first axle arm  521  and the second axle arm  522  disappear after the power of the circuit quits. Thereafter, the first axle arm  521 , the second axle arm  522  and the connective arm  523  gradually recover their original shapes and positions. The tenon  53  is moved left over the top of the bulge  47  and touches the bulge  47  in the recovery procedure. The reflective mirror  44  is static in the transportation because the tenon  53  is on the bulge  47 . That the stationary horizontal element  50  is in the conductive state prevents the torsion mirror device  3  from displacement and damage when the micro mirror is shook and collided in the transportation.  
         [0051]    A problem is that the micro mirror in the prior art is affected by neighboring magnetic field and then the micro mirror rotates slightly. Thereafter, the micro mirror intercepts the incident light or the reflective light and the array of the micro mirror is in the abnormal state as shown in FIG. 8. The torsion mirror device  3  of the present invention discloses interference eliminator  60  to solve the problem. FIG. 16 shows top view of the interference eliminator  60  of the first embodiment in the present invention. The interference eliminator  60  includes the first conductive film  61  of the reflective mirror  44  and the second conductive film  62  of the silicon substrate  41 . The first conductive film  61  and the second conductive film  62  are deposited by the way of sputtering or electroplating. Alternatively, the first conductive film  61  is below the reflective mirror  44  when the reflective mirror  44  is in the horizontal level and the second conductive film  62  is above the silicon substrate  41  corresponding the first conductive film  61 . The operation way: the first conductive film  61  is conductive with the first supply  63  and the second conductive film  62  is conductive with the second supply  64 . Furthermore, the first conductive film  61  is provided opposite charge to the second conductive film  62 . For the first exemplary embodiment of the present invention, the first conductive film  61  is provided with positive charge and the second conductive film  62  is provided with negative charge. The reflective mirror  44  is static in the horizontal level for the electrostatic induction (positive and negative charge attract each other) when the actuator of other micro mirror induces the magnetization. As shown in FIG. 8, the interference eliminators  60  are individually set up on the mirrors labeled  211 ,  212 ,  214 ,  222 ,  223 ,  224 ,  231 ,  233 ,  234 ,  241 ,  242  and  243  in the horizontal level. These horizontal mirrors are unaffected by the actuators of the mirrors labeled  213 ,  221 ,  232  and  244  inducing magnetization in the vertical level. In the same way, the interference eliminators  60  are set up on the mirrors labeled  213 ,  221 ,  232  and  244 . The mirrors labeled  213 ,  221 ,  232  and  244  are unaffected by the actuators of the other mirrors and static in the horizontal level.  
         [0052]    [0052]FIG. 17 shows the 3D view of a stationary vertical element  70  of the second exemplary embodiment of the present invention. On a flat silicon substrate  71 , a stationary vertical element  70  is formed by lithography process. The stationary vertical element  70  includes the first fixed position element  73 , the second fixed position element  74 , a reflective element  75 , an actuator  76  and a bump  77 .  
         [0053]    Alternatively, the first fixed position element  73  includes the first connector section  73   a , the first torsion bar  731 , the first orientation mirror  734  and the first side  735 . The second fixed element  74  includes the second connector section  74   a , the second torsion bar  741 , the second orientation mirror  744  and the second side  745 . The reflective element  75  includes a third connector section  75   a , a fourth connector section  75   b , a third torsion bar  751  and a reflective mirror  754 . The actuator  76  is under the silicon substrate  71  to provide a repulsive force for pushing the reflective mirror  754 . The bump  77  is fixed under the reflective mirror  754  is a square or a rectangle. The bump  77  is suitable for the reflective mirror  754  placed on the bump  77  when the reflective mirror  754  is in the horizontal level.  
         [0054]    The first connector section  73   a , the first torsion bar  731  and the first orientation mirror  734  are performed by the elastic poly-silicon in the lithography process. The first connector section  73   a  is fixed on the silicon substrate  71 . The first torsion bar  731  is built on the first connector section  73   a  with the suspension mode. The first orientation mirror  734  is formed on the extension part of the middle of the first torsion bar  731 . The first permalloy  732  on the first orientation mirror  73  is formed by the sputtering and electroplating process. The first side  735  is perpendicular to the first torsion bar  731 .  
         [0055]    The second connector section  74   a , the second torsion bar  741  and the second orientation mirror  744  are performed by the elastic poly-silicon in the lithography process. The second connector section  74   a  is fixed on the silicon substrate  71 . The second torsion bar  741  is built on the second connector section  74   a  with the suspension mode. The second torsion bar  741  is parallel to the first torsion bar  731 . The second orientation mirror  744  is formed on the extension part of the middle of the second torsion bar  741 . The second orientation mirror  744  and the first orientation mirror  734  are built between the first torsion bar  731  and the second torsion bar  741 . The second permalloy  742  on the second orientation mirror  74  is formed by the sputtering and electroplating process. The second side  745  is perpendicular to the second torsion bar  741 .  
         [0056]    The reflective element  75 , the third connector section  75   a , the fourth connector section  75   b , the third torsion bar  751  and the reflective mirror  754  are performed by the elastic poly-silicon in the lithography process by the lithography process. The third connector section  75   a  and the fourth connector section  75   b  are performed on the silicon substrate  71  and separated by a suitable distance. The third torsion bar  751  is built between the third connector section  75   a  and the fourth connector section  75   b  with the suspension mode. The third torsion bar  751  is perpendicular to the first torsion bar  731  and the second torsion bar  741 . The third orientation mirror  754  is formed on the extension part of the middle of the third torsion bar  751 . The reflective mirror  754 , the first fixed element  73  and the second fixed element  74  are performed on both sides of the third torsion bar  751 . The third permalloy  752  on the third reflective mirror  754  is formed by the sputtering and electroplating process. Furthermore, the reflective mirror  754  includes a reflective area  753 , which is a flat area to change the incident route after incident light being reflected by the reflective area  753 .  
         [0057]    [0057]FIG. 18 shows a 3D view of the stationary vertical element  70 , which rotates to the vertical level in the second exemplary embodiment. FIG. 19 shows a 3D view of the stationary vertical element  70  static in the vertical level. After the actuator  76  is powered, the rotation principles of the first fixed position element  73  and the second fixed position element  74  and the reflective mirror  754  are similar to the rotation principles of the stationary vertical element  40  as shown in FIGS. 11, 12 and  13 . With reference FIG. 18, the first orientation mirror  734  and the second orientation mirror  744  are individually rotated from the horizontal level to the vertical level. The mass of the first orientation mirror  734  and the second orientation mirror  744  are less than the mass of the reflective mirror  44 . Thereafter, the rotation rate of the first orientation mirror  734  and the second orientation mirror  735  is faster than the reflective mirror  44 .  
         [0058]    [0058]FIGS. 19 and 20 show the stationary vertical element  70  of the second exemplary embodiment. Considering the mass, the first orientation mirror  734  and the second orientation  735  rotate earlier than the reflective mirror  44  and over the vertical level. When the reflective mirror  754  rotate over the vertical level, the first side  735  and the second side  745  provide the reflective mirror  754  to stop in the vertical level. As mention previously, the stationary vertical element  70  fixes the reflective mirror  754  in the vertical level.  
         [0059]    As mentioned above, the present invention has been described in connection with specific exemplary embodiments, it should be appreciated that modifications or changes may be made to the embodiments of the present invention without departing from the inventive concepts contained herein.