WO2015015664A1 - ミラー装置 - Google Patents
ミラー装置 Download PDFInfo
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- WO2015015664A1 WO2015015664A1 PCT/JP2013/083360 JP2013083360W WO2015015664A1 WO 2015015664 A1 WO2015015664 A1 WO 2015015664A1 JP 2013083360 W JP2013083360 W JP 2013083360W WO 2015015664 A1 WO2015015664 A1 WO 2015015664A1
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- Prior art keywords
- magnetic
- mirror
- coil
- region
- magnetic part
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
- G02B26/085—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD the reflecting means being moved or deformed by electromagnetic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0018—Structures acting upon the moving or flexible element for transforming energy into mechanical movement or vice versa, i.e. actuators, sensors, generators
- B81B3/0021—Transducers for transforming electrical into mechanical energy or vice versa
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2201/00—Specific applications of microelectromechanical systems
- B81B2201/04—Optical MEMS
- B81B2201/042—Micromirrors, not used as optical switches
Definitions
- the present invention relates to a mirror device.
- a device including a fixed frame, a movable frame connected to the fixed frame with a beam, and a mirror disposed on the movable frame is known (for example, see Patent Document 1).
- the mirror device described in Patent Document 1 includes a plurality of permanent magnets provided above and below a fixed frame, and includes a coil made of a conductor and provided on a movable frame.
- a current is supplied to the coil, a force corresponding to the magnetic field generated by the permanent magnet and the coil current acts on the coil, and the movable frame swings due to the force acting on the coil. As a result, the mirror swings.
- the number of turns of the coil in order to increase the mirror swing angle, it is possible to increase the number of turns of the coil, increase the current supplied to the coil, or strengthen the magnetic field in the vicinity of the coil.
- the number of turns of the coil is increased, the area occupied by the coil becomes larger, and it becomes difficult to reduce the size of the mirror.
- Increasing the current is not preferable because the coil may be disconnected due to heat generation and power consumption increases. Therefore, it is preferable to increase the magnetic field in the vicinity of the coil.
- an object of the present invention is to provide a mirror device capable of reliably concentrating a magnetic field in the vicinity of a coil.
- a mirror device includes a mirror structure including a support portion, a movable portion that is swingably connected to the support portion, a mirror and a coil that are disposed on the movable portion, and a first structure.
- a first magnetic part having a magnetic pole of polarity and arranged on the back side of the surface of the mirror structure where the mirror is arranged so that the magnetic pole of the first polarity faces the mirror structure, and the first polarity
- the second magnetic part having a different magnetic pole of the second polarity, the second magnetic part arranged on the back side of the mirror structure so that the second polarity magnetic pole faces the mirror structure, and the surface on which the mirror of the mirror structure is arranged
- the first polarity magnetic pole of the first magnetic portion and the first polarity magnetic pole of the first region of the cap structure face each other, and the second magnetic portion
- the second polarity magnetic pole faces the second polarity magnetic pole in the second region of the cap structure.
- the first region and the second region for forming the magnetic field in the vicinity of the coil are integrally formed as a cap structure. For this reason, it becomes easy to position the first region and the second region with high accuracy with respect to the coil. Therefore, according to the mirror device of the present invention, the magnetic field can be reliably concentrated in the vicinity of the coil.
- It may further include a housing having an opening and accommodating the mirror structure, the first magnetic part, and the second magnetic part, and the cap structure may be disposed so as to cover the opening.
- the first magnetic part and the second magnetic part are positioned with respect to the mirror structure by being housed in the housing.
- the cap structure covers the opening of the housing, so that the magnetic field is confined in the vicinity of the coil. For this reason, the magnetic field formed by the first magnetic part and the second magnetic part can be more reliably concentrated in the vicinity of the coil.
- a through-hole is formed at a position corresponding to the mirror, and the through-hole is formed by a tapered inner surface whose diameter is increased from the surface facing the mirror structure of the cap structure toward the back surface. It may be defined.
- the through hole is defined by the tapered inner surface, the light incident on the mirror through the through hole and the light reflected by the mirror and passing through the through hole are the peripheral portion of the through hole. It becomes difficult to interfere with. For this reason, the angle of light input / output by the mirror can be further increased.
- a third magnetic part disposed between the first magnetic part and the second magnetic part may be further provided, and the first magnetic part, the third magnetic part, and the second magnetic part may constitute a Halbach array.
- the magnetic field formed in the vicinity of the coil by the first magnetic part, the third magnetic part, and the second magnetic part constituting the Halbach array can be further strengthened.
- the cap structure may be composed of one member, and may have a first region and a second region by magnetizing a corresponding region in the one member.
- both the first region and the second region are in a desired position with respect to the mirror structure. Positioned reliably. For this reason, the magnetic field can be more reliably concentrated in the vicinity of the coil.
- the first magnetic part and the second magnetic part may be configured by magnetizing corresponding regions in one member.
- both the first magnetic part and the second magnetic part are relative to the mirror structure. It is reliably positioned at a desired position. For this reason, the magnetic field can be more reliably concentrated in the vicinity of the coil.
- the coil has a substantially rectangular shape, and the first magnetic part and the second magnetic part may be arranged in a direction intersecting the direction in which each side of the coil extends.
- the direction of the magnetic field formed by the first magnetic part and the second magnetic part is a direction that intersects the direction in which each side of the coil extends. Therefore, when a current is supplied to the coil, a force acts on all sides of the coil. For this reason, the mirror can be swung efficiently.
- the coil may be arranged on the same side as the first magnetic part and the second magnetic part with respect to the mirror, and may be arranged so as to overlap the mirror when viewed from the direction perpendicular to the mirror.
- it is necessary to make the distance between the first region and the second region that form the magnetic field closer. Matching is difficult.
- the first region and the second region are arranged as regions of the cap structure, it is easy to align the first region and the second region. Therefore, according to the above-described configuration, the effect of the present invention that the magnetic field can be concentrated in the vicinity of the coil is preferably exhibited.
- the present invention it is possible to provide a mirror device that can reliably concentrate a magnetic field in the vicinity of a coil.
- FIG. 1 is a perspective view of a mirror device according to an embodiment of the present invention.
- 2 is a cross-sectional view taken along the line II-II in FIG.
- FIG. 3 is an exploded perspective view of the mirror device.
- FIG. 4 is a plan view of the mirror structure.
- FIG. 5 is a diagram showing the arrangement of coils in the mirror structure.
- FIG. 6 is a diagram schematically showing a magnetic field in the vicinity of the coil.
- FIG. 7 is a graph showing the difference in swing angle depending on the presence or absence of a cap structure.
- FIG. 8 is a diagram illustrating another example of the coil arrangement in the mirror structure.
- FIG. 1 is a perspective view of the mirror device 1.
- 2 is a cross-sectional view taken along the line II-II in FIG.
- FIG. 3 is an exploded perspective view of the mirror device 1.
- each drawing is provided with an X axis, a Y axis, and a Z axis.
- the mirror device 1 includes a mirror structure 10, a lower magnetic body 20, a cap structure 30, and a housing 40.
- the housing 40 has a substantially rectangular parallelepiped shape and accommodates the mirror structure 10 and the lower magnetic body 20.
- the lower magnetic body 20 is disposed on the bottom surface of the opening 41 provided inside the housing 40.
- the mirror structure 10 is disposed above the lower magnetic body 20 (on the Z axis positive direction side).
- the cap structure 30 is disposed so as to cover the opening 41 of the housing 40.
- FIG. 4 is a plan view of the mirror structure 10.
- FIG. 5 is a diagram showing the arrangement of the first coil 17 and the second coil 18 in the mirror structure 10.
- the mirror structure 10 includes a support part 11, a first movable part 12 (movable part) connected to the support part 11, a second movable part 13 (movable part) connected to the first movable part 12, and a first
- positioned at the 2nd movable part 13 are provided. .
- the support portion 11 is a frame that has a rectangular shape when viewed from the Z-axis direction.
- the support part 11 is provided with a rectangular opening part 11a. Of the outer edge of the opening 11a, two sides extending in the X-axis direction are provided with a pair of substantially rectangular recesses 11b and 11b for accommodating the first beam portion.
- the first movable part 12 is a thin plate-like member disposed in the opening part 11 a of the support part 11.
- the first movable portion 12 is connected to the support portion 11 by a pair of first beam portions 14 and 14.
- the pair of first beam portions 14, 14 are located on a straight line A ⁇ b> 1 parallel to the Y axis, and are provided on both sides of the first movable portion 12.
- the first movable portion 12 has a rectangular opening 12a.
- the first movable portion 12 can swing around the straight line A ⁇ b> 1 with respect to the support portion 11. That is, the first movable portion 12 can reciprocate around the straight line A ⁇ b> 1 with respect to the support portion 11.
- the second movable portion 13 includes a substantially square frame 13A and a disk-shaped mirror arrangement portion 13B fixed to the inside of the frame 13A. Of the four sides of the frame 13A, two sides parallel to each other extend in the X-axis direction. The remaining two sides of the frame 13A extend in the Y-axis direction. The outer peripheral surface of the mirror arrangement portion 13B is in contact with the inner peripheral surfaces of the four sides of the frame 13A.
- the second movable portion 13 is connected to the first movable portion 12 by a pair of second beam portions 15 and 15.
- the pair of second beam portions 15, 15 are located on a straight line A ⁇ b> 2 parallel to the X axis, and are provided on both sides of the second movable portion 13.
- the second movable part 13 can swing around the straight line A ⁇ b> 2 with respect to the first movable part 12. That is, the second movable portion 13 can reciprocate around the straight line A ⁇ b> 2 with respect to the first movable portion 12.
- the first beam portion 14 has a meandering shape.
- the shape of the first beam portion 14 is not limited to the meandering shape, and the first beam portion 14 may extend linearly in the Y-axis direction.
- the second beam portion 15 extends linearly in the X-axis direction. One end of the second beam portion 15 is connected to the inner peripheral surface of the opening 12 a of the first movable portion 12. The other end of the second beam portion 15 is connected to the outer peripheral surface of the second movable portion 13. The other end side of the second beam portion 15 is gradually widened toward the second movable portion 13 side.
- the shape of the second beam portion 15 is not limited to a linear shape, and may be a meandering shape, for example.
- the mirror 16 is disposed on the mirror facing portion 13B of the second movable portion 13 on the surface facing the cap structure 30.
- the mirror 16 is a light reflecting film composed of a metal thin film.
- the first coil 17 is disposed in the first movable portion 12.
- the first coil 17 has a substantially rectangular shape composed of a side parallel to the X axis and a side parallel to the Y axis. In the present specification, the rectangle includes a square.
- the first coil 17 can be configured, for example, by providing a spiral groove on the surface of the first movable portion 12 on the side facing the cap structure 30 and arranging a metal material in the groove.
- the first coil 17 is electrically connected to a pair of pads 19 ⁇ / b> A and 19 ⁇ / b> A on the support portion 11 by wiring 17 ⁇ / b> A disposed on one first beam portion 14. Therefore, a current is supplied to the first coil 17 by supplying a current between the pair of pads 19A, 19A.
- the second coil 18 is disposed on the frame 13A of the second movable portion 13.
- the second coil 18 has a substantially rectangular shape composed of a side parallel to the X axis and a side parallel to the Y axis.
- the second coil 18 can be configured, for example, by providing a spiral groove on the surface of the frame 13A on the side facing the cap structure 30 and arranging a metal material in the groove.
- the second coil 18 is drawn out on the first movable part 12 by the wiring 18 ⁇ / b> A arranged on the second beam part 15, and the support part 11 by the wiring 18 ⁇ / b> B arranged on the first beam part 14.
- the upper pair of pads 19B and 19B are electrically connected. Therefore, a current is supplied to the second coil 18 by supplying a current between the pair of pads 19B, 19B.
- the number of turns of the first coil 17 and the second coil 18 may be determined as appropriate. When the number of turns of the first coil 17 and the second coil 18 is increased, the force generated in the first coil 17 and the second coil 18 when current is supplied to the first coil 17 and the second coil 18 is increased, and accordingly Thus, the swing angle of the mirror 16 can be increased.
- the mirror structure 10 having the above-described configuration, for example, performs processing such as anisotropic etching on a semiconductor substrate such as silicon to provide the first movable portion 12, the second movable portion 13, the first beam portion 14, By forming the two beam portions 15, they are integrally formed.
- the lower magnetic body 20 is one member having a rectangular parallelepiped shape. Three sides perpendicular to each other of the lower magnetic body 20 extend in the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.
- the lower magnetic body 20 includes a first magnetic part 21, a second magnetic part 22, and a third magnetic part 23.
- the 1st magnetic part 21 and the 2nd magnetic part 22 are arranged in the direction which intersects the direction (namely, X-axis direction and Y-axis direction) where each side of the 1st coil 17 and the 2nd coil 18 extends.
- first magnetic part 21 and the second magnetic part 22 are respectively disposed on one end side and the other end side in the diagonal direction of the bottom surface of the lower magnetic body 20 in the lower magnetic body 20.
- the third magnetic part 23 is disposed between the first magnetic part 21 and the second magnetic part 22.
- the boundary surface 24 between the first magnetic part 21 and the third magnetic part 23 and the boundary surface 25 between the third magnetic part 23 and the second magnetic part 22 are parallel to the Z axis and both the X axis and the Y axis. Is a plane that intersects
- the boundary surface 24 and the boundary surface 25 form an angle of, for example, 45 ° with respect to the X axis and the Y axis, respectively.
- the first magnetic part 21, the second magnetic part 22, and the third magnetic part 23 are arranged in this manner, the first magnetic part 21, the second magnetic part 22, and the third magnetic part 23 are, for example, a casing. A magnetic field in a direction parallel to the diagonal direction of the bottom surface of 40 is generated.
- the first coil 17 and the second coil 18 have a substantially rectangular shape including a side parallel to the X axis and a side parallel to the Y axis.
- the first coil 17 and the second coil 18 can be applied even if a current is passed through the first coil 17 and the second coil 18. No force acts on this side.
- the second movable portion 13 is swung in a two-dimensional direction around the X axis and around the Y axis.
- the lower magnetic body 20 it is necessary to separately provide magnetic bodies that generate a magnetic field in two directions, a magnetic field in a direction parallel to the X axis and a magnetic field in a direction parallel to the Y axis.
- the first magnetic part 21, the third magnetic part 23, and the second magnetic part 22 of the lower magnetic body 20 are parallel to the Z axis and intersect both the X axis and the Y axis. Generate a magnetic field in the direction. Therefore, in this embodiment, it is not necessary to separately provide magnetic bodies that generate magnetic fields in two directions.
- each side of the first coil 17 and the second coil 18 intersects both the X axis and the Y axis.
- the second movable portion 13 can be moved along the X-axis and the Y-axis even if the lower magnetic body 20 does not generate magnetic fields in two directions. It can be swung in a two-dimensional direction around each of the axes.
- the lower magnetic body 20 is disposed on the back surface 10b side of the mirror structure 10, that is, the Z-axis negative direction side.
- the back surface 10b is the back surface of the surface on which the mirror 16 of the mirror structure is disposed. Therefore, the first magnetic part 21 and the second magnetic part 22 are arranged on the back surface 10 b side of the mirror structure 10.
- the first magnetic part 21 has a first polarity magnetic pole 21a and a second polarity magnetic pole 21b different from the first polarity.
- the first polarity is the polarity of the S pole
- the second polarity is the polarity of the N pole.
- the first polarity may be the polarity of the N pole
- the second polarity may be the polarity of the S pole.
- the magnetic pole 21 a is disposed so as to face the mirror structure 10. That is, the magnetic pole 21 a is disposed on the positive side of the Z axis in the first magnetic part 21.
- the magnetic pole 21b is disposed on the side opposite to the magnetic pole 21a, that is, on the side of the first magnetic portion 21 in the negative Z-axis direction.
- the second magnetic part 22 has a first polarity magnetic pole 22a and a second polarity magnetic pole 22b.
- the magnetic pole 22b is disposed so as to face the mirror structure 10.
- the magnetic pole 22b is arranged on the Z-axis positive direction side in the second magnetic portion 22.
- the magnetic pole 22a is disposed on the side opposite to the magnetic pole 22b, that is, on the side of the second magnetic portion 22 in the negative Z-axis direction.
- the third magnetic part 23 has a first polarity magnetic pole 23a and a second polarity magnetic pole 23b.
- the magnetic pole 23 a is disposed on the side of the third magnetic part 23 that faces the first magnetic part 21.
- the magnetic pole 23 b is disposed on the third magnetic part 23 on the side facing the second magnetic part 22.
- the first magnetic part 21, the third magnetic part 23, and the second magnetic part 22 constitute a Halbach array. Specifically, in the first magnetic part 21, the first polarity magnetic pole 21 a and the second polarity magnetic pole 21 b of the first magnetic part 21 are perpendicular to the surface 10 a and the surface 10 b of the mirror structure 10. Are facing each other. In the third magnetic part 23 adjacent to the first magnetic part 21, the first polarity magnetic pole 23 a and the second polarity magnetic pole 23 b of the third magnetic part 23 are relative to the surface 10 a and the surface 10 b of the mirror structure 10. Opposing in parallel direction.
- the first polarity magnetic pole 22a and the second polarity magnetic pole 22b are:
- the mirror structure 10 faces the surface 10a and the surface 10b in a direction perpendicular to the surface 10a.
- the cap structure 30 is a plate-like member that has a rectangular shape when viewed from the Z-axis direction.
- the cap structure 30 is disposed on the surface side of the mirror structure 10 on which the mirror 16 is disposed, that is, on the Z axis positive direction side.
- the cap structure 30 has a first region 31, a second region 32, and a third region 33.
- the first region 31 has a first polarity magnetic pole 31a and a second polarity magnetic pole 31b.
- the magnetic pole 31 a is disposed so as to face the first polarity magnetic pole 21 a of the first magnetic part 21. That is, the magnetic pole 31a is disposed on the negative side of the first region 31 in the Z-axis direction.
- the magnetic pole 31b is disposed in the first region 31 on the side opposite to the magnetic pole 31a, that is, on the Z-axis positive direction side in the first region 31.
- the surface of the first region 31 facing the mirror structure 10 is parallel to the mirror structure 10.
- the second region 32 has a first polarity magnetic pole 32a and a second polarity magnetic pole 32b.
- the magnetic pole 32b is disposed so as to oppose the second polarity magnetic pole 22b of the second magnetic portion 22.
- the magnetic pole 32 b is disposed on the negative side of the second region 32 in the Z-axis direction.
- the magnetic pole 32a is disposed on the opposite side of the magnetic pole 32b in the second region 32, that is, on the Z-axis positive direction side in the second region 32.
- the surface of the second region 32 on the side facing the mirror structure 10 is parallel to the mirror structure 10.
- the third area 33 is located between the first area 31 and the second area 32.
- the third region 33 is not magnetized.
- a through hole 34 is formed at a position corresponding to the mirror 16, in other words, at a position overlapping the mirror 16 when viewed from the Z-axis direction.
- the through-hole 34 is defined by a tapered inner surface 34 a whose diameter is increased from the surface 30 a side facing the mirror structure 10 of the cap structure 30 toward the back surface 30 b side.
- the cap structure 30 can be configured using, for example, a neodymium magnet or a samarium cobalt magnet.
- the thickness T in the Z-axis direction of the cap structure 30 is preferably set to 1 mm or more, for example. Further, the distance D in the Z-axis direction between the surface of the cap structure 30 facing the mirror structure 10 and the mirror 16 is preferably smaller than the thickness T of the cap structure 30 in the Z-axis direction.
- the distance D will be further described.
- the positional accuracy and flatness in the height direction (Z-axis direction) of the mirror structure 10 and the magnetic body (for example, the cap structure 30) disposed thereabove control the magnetic field around the mirror structure 10. It is a very important parameter.
- a plurality of magnetic bodies are individually arranged as in the mirror device described in Patent Document 1, it is difficult to align the plurality of magnetic bodies in the height direction and maintain flatness. For this reason, there is a possibility that a desired magnetic field cannot be obtained due to a shift in the distance between the mirror structure 10 and the magnetic body.
- the distance D between the cap structure 30 and the mirror 16 described above is smaller than the thickness T of the cap structure 30, the repulsive force between the mirror structure 10 and the magnetic body is large.
- the positioning of the magnetic material is very difficult. Therefore, in order to accurately adjust the distance D while maintaining the relationship that the distance D is smaller than the thickness T, the first region 31 and the second region 32 are connected to the cap structure 30 as in the present embodiment. It is preferable to integrate.
- the size of the third region 33 located between the first region 31 and the second region 32 By changing the size of the third region 33 located between the first region 31 and the second region 32, the distribution of the magnetic field formed by the first region 31 and the second region 32 can be changed. . Therefore, the size of the third region 33 can be appropriately determined so that the magnetic field formed by the first region 31 and the second region 32 is concentrated in the vicinity of the first coil 17 and the second coil 18.
- the first polarity magnetic pole 31 a of the first region 31 is disposed so as to face the first polarity magnetic pole 21 a of the first magnetic portion 21, and the second polarity magnetic pole of the second region 32.
- 32 b is arranged so as to face the magnetic pole 22 b of the second polarity of the second magnetic part 22.
- the first magnetic part 21 and the second magnetic part 22 are, for example, in a direction parallel to the diagonal direction of the bottom surface of the housing 40, similarly to the first magnetic part 21, the second magnetic part 22, and the third magnetic part 23. Generate a magnetic field.
- the cap structure 30 is made of one member, and has a first region 31 and a second region 32 by magnetizing a corresponding region in the one member.
- the cap structure 30 is configured by magnetizing the first region 31 and the second region 32 of one member.
- a coil is arranged around each part of the first region 31 and the second region 32, and a predetermined current is passed through the coil to generate a magnetic field. Can be done.
- the housing 40 has a substantially rectangular parallelepiped shape and has an opening 41.
- the housing 40 accommodates the mirror structure 10 and the lower magnetic body 20 in the opening 41. That is, the housing 40 houses the mirror structure 10, the first magnetic part 21, and the second magnetic part 22.
- FIG. 6 is a diagram schematically showing the magnetic field distribution in the cross section taken along the line II-II in FIG. 1 (that is, the same cross section as FIG. 2).
- the magnetic field F ⁇ b> 1 by the lower magnetic body 20 is formed from the first polarity magnetic pole 21 a of the first magnetic portion 21 toward the second polarity magnetic pole 22 b of the second magnetic portion 22.
- the magnetic field F ⁇ b> 2 due to the cap structure 30 is formed from the first polarity magnetic pole 31 a in the first region 31 toward the second polarity magnetic pole 32 b in the second region 32.
- the magnetic fields F ⁇ b> 1 and F ⁇ b> 2 are formed substantially along the surfaces of the lower magnetic body 20 and the cap structure 30 at a position sandwiched between the third magnetic portion 23 and the third region 33.
- An ellipse R1 and an ellipse R2 schematically show regions where the first coil 17 and the second coil 18 are located.
- the magnetic field formed by the first magnetic part 21, the second magnetic part 22, the first region 31, and the second region 32 is concentrated at the positions indicated by the ellipse R1 and the ellipse R2.
- the mirror structure 10 and the lower magnetic body 20 are fixed in the opening 41 of the housing 40.
- the first region 31 and the second region 32 in the cap structure 30 are magnetized in advance.
- the cap structure 30 is bonded to the housing 40 so as to cover the opening 41.
- the mirror device 1 is obtained by the above assembly process.
- the operation of the mirror device 1 is as follows.
- a current corresponding to a desired angle of the mirror 16 is supplied to the first coil 17, a force corresponding to the supplied current is generated in the first coil 17.
- the first movable portion 12 rotates around the straight line A1 (see FIG. 4) to an angle at which the force generated in the first coil 17 and the restoring force of the first beam portion 14 are balanced.
- the mirror device 1 In the mirror device 1, light enters the mirror 16 through the through-hole 34 from the Z-axis positive direction side, and the light incident on the mirror 16 is reflected again through the through-hole 34 to the Z-axis positive direction side. Is done.
- the traveling direction of the reflected light varies depending on the angle of the mirror 16.
- the angle of the mirror 16 can be controlled by changing the magnitude of the current supplied to the first coil 17 and the second coil 18 and rotating the first movable part 12 and the second movable part 13. is there. Therefore, by controlling the current supplied to the first coil 17 and the second coil 18, the traveling direction of the light reflected by the mirror device 1 can be controlled.
- FIG. 7 is a diagram comparing the swing angle of the mirror 16 in the mirror device 1 of the present embodiment with the swing angle of the mirror in the mirror device of the comparative example.
- the horizontal axis of FIG. 7 represents the applied current (unit: mA) applied to the first coil 17 and the second coil 18.
- the vertical axis in FIG. 7 represents the rocking angle (unit: °).
- the solid curve in FIG. 7 represents the swing angle of the mirror 16 in the mirror device 1 of the present embodiment.
- the broken curve in FIG. 7 represents the swing angle of the mirror in the mirror device of the comparative example.
- the mirror device of the comparative example is different from the mirror device 1 of the present embodiment in that it does not have the cap structure 30, and is otherwise configured in accordance with the mirror device 1 of the present embodiment. ing.
- the swing angle of the mirror device 1 of this embodiment is about 14 °, whereas the swing angle of the mirror device of the comparative example is about 6 °. It is.
- a swing angle that is twice or more that of the mirror device of the comparative example can be obtained.
- the first polarity magnetic pole 21a of the first magnetic portion 21 and the first polarity magnetic pole 31a of the first region 31 of the cap structure 30 are opposed to each other.
- the second polarity magnetic pole 22 b of the magnetic part 22 and the second polarity magnetic pole 32 b of the second region 32 of the cap structure 30 are opposed to each other. Therefore, strong magnetic fields F1 and F2 are formed in the vicinity of the first coil 17 and the second coil 18 by the first magnetic part 21, the second magnetic part 22, and the first region 31 and the second region 32 of the cap structure 30. Is done.
- the magnetic fields F1 and F2 formed by the first region 31 and the second region 32 are adjusted by adjusting the size of the non-magnetized third region 33 located between the first region 31 and the second region 32. Can be concentrated in the vicinity of the first coil 17 and the second coil 18. Further, the magnetic fields F ⁇ b> 1 and F ⁇ b> 2 are confined in the vicinity of the first coil 17 and the second coil 18 by the cap structure 30 having the third region 33. Thereby, the magnetic field in the vicinity of the first coil 17 and the second coil 18 is further strengthened.
- the first region 31 and the second region 32 that form the magnetic fields F ⁇ b> 1 and F ⁇ b> 2 in the vicinity of the first coil 17 and the second coil 18 are integrally formed as a cap structure 30. For this reason, it becomes easy to position the first region 31 and the second region 32 with respect to the first coil 17 and the second coil 18 with high accuracy. Therefore, according to the mirror device 1, the magnetic fields F1 and F2 can be reliably concentrated in the vicinity of the first coil 17 and the second coil 18.
- the mirror device 1 further includes a housing 40 having an opening 41 and accommodating the mirror structure 10, the first magnetic part 21, and the second magnetic part 22.
- the cap structure 30 is disposed so as to cover the opening 41.
- the first magnetic part 21 and the second magnetic part 22 are positioned with respect to the mirror structure 10 by being accommodated in the housing 40.
- the cap structure 30 covers the opening 41 of the housing 40, so that the magnetic fields F 1 and F 2 are confined in the vicinity of the first coil 17 and the second coil 18.
- the magnetic fields F ⁇ b> 1 and F ⁇ b> 2 formed by the first magnetic part 21 and the second magnetic part 22 can be more reliably concentrated in the vicinity of the first coil 17 and the second coil 18.
- a through hole 34 is formed in the third region 33 at a position corresponding to the mirror 16, and the through hole 34 extends from the surface 30 a side of the cap structure 30 facing the mirror structure 10 toward the back surface 30 b side. It is defined by an enlarged tapered inner surface 34a.
- the through hole 34 is defined by the tapered inner surface 34a whose diameter increases from the surface 30a side to the back surface 30b side of the cap structure 30.
- the light incident on the mirror 16 through the through hole 34 and the light reflected by the mirror 16 and passing through the through hole 34 are less likely to interfere with the peripheral portion of the through hole 34. For this reason, the angle of light input / output by the mirror 16 can be further increased.
- the apparatus further includes a third magnetic part 23 disposed between the first magnetic part 21 and the second magnetic part 22, and the first magnetic part 21, the third magnetic part 23, and the second magnetic part 22 constitute a Halbach array. is doing. For this reason, the magnetic fields F1 and F2 formed in the vicinity of the first coil 17 and the second coil 18 are further strengthened by the first magnetic part 21, the third magnetic part 23, and the second magnetic part 22 constituting the Halbach array. Can do.
- the cap structure 30 is made of one member, and has a first region 31 and a second region 32 by magnetizing a corresponding region in the one member. For this reason, by positioning one member having the first region 31 and the second region 32 with respect to the mirror structure 10, both the first region 31 and the second region 32 are relative to the mirror structure 10. It is reliably positioned at a desired position. For this reason, the magnetic fields F1 and F2 can be more reliably concentrated in the vicinity of the first coil 17 and the second coil 18.
- the first magnetic part 21 and the second magnetic part 22 are configured by magnetizing corresponding regions in the lower magnetic body 20 which is one member. For this reason, the 1st magnetic part 21 and the 2nd magnetic part 22 are positioned by positioning the lower magnetic body 20 as one member which comprises the 1st magnetic part 21 and the 2nd magnetic part 22 with respect to the mirror structure 10. FIG. Both of these are reliably positioned at a desired position with respect to the mirror structure 10. For this reason, the magnetic fields F1 and F2 can be more reliably concentrated in the vicinity of the first coil 17 and the second coil 18.
- the first coil 17 and the second coil 18 have a substantially rectangular shape, and the first magnetic part 21 and the second magnetic part 22 are in the direction in which each side of the first coil 17 and the second coil 18 extends ( That is, they are arranged in a direction crossing the X-axis direction and the Y-axis direction).
- the direction of the magnetic field formed by the first magnetic part 21 and the second magnetic part 22 is a direction that intersects the direction in which the sides of the first coil 17 and the second coil 18 extend. Therefore, when a current is supplied to the first coil 17 and the second coil 18, a force acts on all sides of the first coil 17 and the second coil 18. For this reason, the mirror 16 can be efficiently swung.
- the first magnetic part 21 and the second magnetic part 22 arranged below the mirror structure are arranged so as to generate a magnetic field in a direction intersecting both the X axis and the Y axis. For this reason, when the magnetic body is disposed on the upper part of the mirror structure 10, the X and Y axes are crossed along the direction of the magnetic field generated by the first magnetic portion 21 and the second magnetic portion 22. Need to be arranged in the direction. In this case, alignment of the magnetic body disposed on the upper portion of the mirror structure 10 is more difficult than when the magnetic body is disposed in parallel to the X axis or the Y axis.
- the cap structure 30 is made of one member, and the first region 31 and the second region 32 are formed by magnetizing the corresponding region in the cap structure 30. For this reason, the alignment of the first region 31 and the second region 32 can also be accurately adjusted by magnetization.
- the lower magnetic body 20 is housed in the housing 40, but the lower magnetic body 20 and the housing 40 may be integrated.
- the through hole 34 is defined by the tapered inner surface 34a.
- the through hole 34 may be defined by an inner surface perpendicular to the surface 30a facing the mirror structure 10 of the cap structure 30, in other words, an inner surface parallel to the Z axis.
- the lower magnetic body 20 has the third magnetic part 23.
- the part corresponding to the third magnetic part 23 in the lower magnetic body 20 may not be magnetized.
- the cap structure 30 is one member having the first region 31, the second region 32, and the third region 33.
- the member corresponding to the first region 31, the member corresponding to the second region 32, and the member corresponding to the third region 33 are respectively separate members, and these separate members are combined to constitute the cap structure. It is good as well.
- the 1st magnetic part 21, the 2nd magnetic part 22, and the 3rd magnetic part 23 assumed that the area
- the second magnetic part 22 and the third magnetic part 23 may be separate members.
- a magnetic material may be arranged.
- a magnetic material may be disposed on the side wall portion of the housing 40.
- a magnetic material may be adhered to the side wall portion of the housing 40, or a groove may be formed in the side wall portion of the housing 40, and the magnetic material may be embedded in the groove.
- the second coil 18 is arranged around the mirror 16 as shown in FIG.
- the second coil 18 may be disposed directly below the mirror 16.
- the second coil 18 is located on the same side as the first magnetic part 21 and the second magnetic part 22 with respect to the mirror 16 and is viewed from a direction perpendicular to the mirror 16 (Z-axis direction). It may be arranged at a position overlapping with.
- FIG. 8 shows a modification in which the second coil 18 is arranged directly under the mirror 16.
- the second movable portion 13 has a circular shape that is slightly larger than the mirror 16.
- the second coil 18 has a substantially regular octagonal helical shape and is disposed immediately below the mirror 16.
- the second coil 18 is disposed on the same side as the first magnetic part 21 and the second magnetic part 22 (the negative side in the Z-axis direction) with respect to the mirror 16. In addition, they are arranged so as to overlap the mirror 16 when viewed from the direction perpendicular to the mirror 16 (Z-axis direction).
- the first magnetic part that forms a magnetic field in order to form a magnetic field at a position close to the center of the mirror structure 10 where the second coil 18 is arranged.
- the distance between 21 and the second magnetic part 22 It is necessary to reduce the distance between 21 and the second magnetic part 22. As the distance between the first magnetic part 21 and the second magnetic part 22 is made closer, it is also necessary to make the distance between the first region 31 and the second region 32 closer.
- the first region 31 and the second region 32 are separate magnetic bodies, if the distance between the first region 31 and the second region 32 is short, the distance between the first region 31 and the second region 32 is It is difficult to assemble the mirror device 1 with proper adjustment.
- the first region 31 and the second region 32 are arranged as the regions of the cap structure 30, and therefore, the first region 31 and the second region 32 at the time of assembling the mirror device 1. The distance is easy to adjust accurately.
- the present invention can be used for a mirror device.
- region 31 32 ... a second region, 32b ... a second polarity magnetic pole of the second region 32, 33 ... a third region, 34 ... a through hole, 34a ... an inner surface of the through hole 34, 40 ... a housing, 41 ... an opening.
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- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
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- Mechanical Light Control Or Optical Switches (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
Claims (8)
- ミラー装置であって、
支持部と、前記支持部に揺動可能に連結された可動部と、前記可動部に配置されたミラー及びコイルと、を有するミラー構造体と、
第一極性の磁極を有すると共に、前記ミラー構造体の前記ミラーが配置された面の裏面側に、第一極性の前記磁極が前記ミラー構造体と対向するように配置された第一磁性部と、
第一極性とは異なる第二極性の磁極を有し、第二極性の前記磁極が前記ミラー構造体と対向するように前記ミラー構造体の前記裏面側に配置された第二磁性部と、
前記ミラー構造体の前記ミラーが配置された前記面側に配置されたキャップ構造体と、
を備え、
前記キャップ構造体は、
前記第一磁性部の第一極性の前記磁極に対向するように位置する第一極性の磁極を有する第一領域と、
前記第二磁性部の第二極性の前記磁極に対向するように位置する第二極性の磁極を有する第二領域と、
前記第一領域と前記第二領域との間に位置し、着磁されていない第三領域と、を有する。 - 請求項1に記載のミラー装置であって、
開口部を有し、前記ミラー構造体、前記第一磁性部、及び前記第二磁性部を収容する筐体をさらに備え、
前記キャップ構造体は、前記開口部を覆うように配置されている。 - 請求項1又は2に記載のミラー装置であって、
前記第三領域には、前記ミラーに対応する位置に貫通孔が形成されており、前記貫通孔は、前記キャップ構造体の前記ミラー構造体に対向する面側から裏面側に向かって拡径したテーパ状の内面により画成されている。 - 請求項1~3のいずれか一項に記載のミラー装置であって、
前記第一磁性部と前記第二磁性部との間に配置された第三磁性部をさらに備え、
前記第一磁性部、前記第三磁性部及び前記第二磁性部が、ハルバッハ配列を構成する。 - 請求項1~4のいずれか一項に記載のミラー装置であって、
前記キャップ構造体は、一の部材からなり、該一の部材における対応する領域が着磁されることにより前記第一領域と前記第二領域とを有する。 - 請求項1~5のいずれか一項に記載のミラー装置であって、
前記第一磁性部と前記第二磁性部とは、一の部材における対応する領域がそれぞれ着磁されることにより構成されている。 - 請求項1~6のいずれか一項に記載のミラー装置であって、
前記コイルは、略長方形状を有しており、
前記第一磁性部と前記第二磁性部とは、前記コイルの各辺が延びる方向に交差する方向に配列されている。 - 請求項1~7のいずれか一項に記載のミラー装置であって、
前記コイルは、前記ミラーに対して前記第一磁性部及び前記第二磁性部と同じ側に配置され、かつ、前記ミラーに垂直な方向から見て前記ミラーと重なるように配置されている。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP13890590.6A EP3029509A4 (en) | 2013-08-01 | 2013-12-12 | Mirror device |
US14/904,213 US20160154233A1 (en) | 2013-08-01 | 2013-12-12 | Mirror device |
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JP2013-160589 | 2013-08-01 | ||
JP2013160589A JP2017060205A (ja) | 2013-08-01 | 2013-08-01 | ミラー装置 |
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PCT/JP2013/083360 WO2015015664A1 (ja) | 2013-08-01 | 2013-12-12 | ミラー装置 |
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US (1) | US20160154233A1 (ja) |
EP (1) | EP3029509A4 (ja) |
JP (1) | JP2017060205A (ja) |
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US10317952B2 (en) * | 2016-09-30 | 2019-06-11 | Intel Corporation | Compartment for magnet placement |
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DE102021204467A1 (de) | 2021-05-04 | 2022-11-10 | Robert Bosch Gesellschaft mit beschränkter Haftung | Mikromechanisches Schwingungssystem |
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- 2013-12-12 EP EP13890590.6A patent/EP3029509A4/en not_active Withdrawn
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Also Published As
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EP3029509A1 (en) | 2016-06-08 |
US20160154233A1 (en) | 2016-06-02 |
EP3029509A4 (en) | 2017-01-18 |
JP2017060205A (ja) | 2017-03-23 |
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