Motor

Abstract

The purpose of the present invention is to improve fixation between a mirror and a sleeve in a motor.　A motor (1) comprises a sleeve (20) which has a base (21) and a mirror (30) which has a bottom part (31) that is supported by the base (21) in the axial direction. In the motor (1), the inner surface (33) of the mirror (30) is inclined with respect to the outer surface (22) of the sleeve (20). In the motor (1), the inner surface (33) of the mirror (30) and the outer surface (22) of the sleeve (20) are coupled to each other with a resin (80) therebetween in the radial direction.

Description

Motor

[0001] The present invention relates to a motor.

[0002] Generally, a motor is used to rotate a polygon mirror scanner as an optical deflector in a laser writing system such as a laser printer. In the polygon mirror scanner, the motor rotates a polygon mirror (a multifaceted mirror), causing a laser beam emitted from a laser diode to scan a photosensitive member (see Patent Document 1).

[0003] Japanese Patent Application Publication No. 08-118496

[0004] In polygon mirror scanners, the polygon mirror is fixed to the motor shaft by inserting a sleeve into a hole in the center. In motors used in such polygon mirror scanners, the polygon mirror fixed to the sleeve tends to move in the axial direction. For this reason, further improvements have been required in the structure for fixing the polygon mirror in motors used in polygon mirror scanners.

[0005] The present invention addresses the above-mentioned problem as an example, and has as one example of an object thereof to provide a motor that can improve the fixation between the mirror and the sleeve.

[0006] In order to achieve the above object, the motor of the present invention comprises a sleeve having a base and a mirror having a bottom supported by the base in the axial direction, the inner surface of the mirror being inclined with respect to the outer surface of the sleeve, and the inner surface of the mirror and the outer surface of the sleeve being connected radially via resin.

[0007] FIG. 1 is a cross-sectional view schematically showing the configuration of a motor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing an enlarged view of the motor shown in FIG. 1, focusing on a mirror and a sleeve. FIG. 3 is a perspective view showing a mirror provided in the motor shown in FIG. 1. FIG. 4 is a cross-sectional view schematically showing the configuration of a first modified example of a motor according to an embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing the configuration of a second modified example of a motor according to an embodiment of the present invention. FIG. 6 is a cross-sectional view schematically showing the configuration of a third modified example of a motor according to an embodiment of the present invention.

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motor according to an embodiment of the present invention will now be described with reference to the drawings.

[0009] FIG. 1 is a cross-sectional view showing a schematic configuration of a motor according to an embodiment of the present invention.

[0010] In the following description, for convenience, the direction of arrow a in the direction of axis x (hereinafter referred to as the "axial direction") will be referred to as the upper side a, and the direction of arrow b will be referred to as the lower side b. Furthermore, in the radial direction perpendicular to axis x, the direction away from axis x (the direction of arrow c in FIG. 1) will be referred to as the outer circumferential side c, and the direction toward axis x (the direction of arrow d in FIG. 1) will be referred to as the inner circumferential side d. In the following description, for convenience, the direction shown in FIG. 1 will be referred to as the side of the motor. In the following description, for convenience, the direction of the motor viewed from the upper side a toward the lower side b will be referred to as the plane, and the direction viewed from the lower side b toward the upper side a will be referred to as the bottom.

[0011] 1, motor 1 according to this embodiment includes sleeve 20 having base 21, and mirror 30 having bottom 31 supported in the axial direction by base 21, with inner surface 33 of mirror 30 inclined relative to outer surface 22 of sleeve 20, and inner surface 33 of mirror 30 and outer surface 22 of sleeve 20 connected in the radial direction via resin 80. The configuration and operation of motor 1 will now be described in detail.

[0012] [Configuration of the Motor] In addition to the components described above, the motor 1 includes a stator 2, a coil 3, a shaft 41, a rotor 42, a magnet 43, and a base 9.

[0013] The stator 2 includes a stator core in which a plurality of thin, annular magnetic bodies 29, such as electromagnetic steel plates, are stacked in an axial direction, which is an example of a predetermined direction, an insulator 24, and a coil 3. The stator 2 is fixed to a base 9.

[0014] The coil 3 is made of a conducting wire and is wound around the stator core via an insulator 24. The insulator 24 is an insulating member attached to the stator core. In order to attach the insulator 24 to the stator core, the shape of the portion of the insulator 24 that is joined to the stator core corresponds to the shape of the outer periphery of the stator 2.

[0015] The shaft 41 is supported relative to the stator 2 .

[0016] The rotor 42 includes a cylindrical portion 62, a disk-shaped or approximately disk-shaped top surface 63 that covers the upper side of the stator 2 in the axial direction, and a hole (inner peripheral portion) 64 located at the center of the top surface 63. The cylindrical portion 62 surrounds the stator 2. In other words, the motor 1 is an outer rotor type in which the rotor 42 is located on the outer peripheral side of the stator 2 in the radial direction. The cylindrical portion 62 includes a hole or inner peripheral portion 64, and is formed in a cylindrical or approximately cylindrical shape centered on the center of the hole or inner peripheral portion 64. The cylindrical portion 62 also supports a magnet 43, and in the illustrated example, the magnet 43 is fixed to the inner peripheral surface of the cylindrical portion 62. Like the cylindrical portion 62, the magnet 43 is formed in a cylindrical or approximately cylindrical shape, or in an arc-like or approximately arc-like shape centered on the center of the hole or inner peripheral portion 64. The rotor 42 is fixed to the shaft 41 via a sleeve 20. Specifically, the hole or inner periphery 64 of the rotor 42 is fixed to a groove 28 (or recess) provided in the outer surface 22 of the sleeve 20. The groove 28 has a recessed shape in the radial direction, and the groove 28 accommodates or holds the hole or inner periphery 64 of the rotor 42.

[0017] The base 9 is provided, for example, on the lower side in the axial direction of the motor 1 as shown in Fig. 1. The base 9 has, for example, a disk-like or substantially disk-like planar shape. The stator 2 is fixed to the upper side of the base 9.

[0018] Fig. 2 is an enlarged cross-sectional view of the motor 1, focusing on the mirror 30 and the sleeve 20. Fig. 3 is a perspective view of the mirror 30 provided in the motor 1.

[0019] 3, the mirror 30 has a bottom 31, a reflective surface 32 forming the outer circumferential surface, an inner surface 33, an upper surface 34, and a hole or inner peripheral portion 35. The hole or inner peripheral portion 35 is formed inside the inner surface 33. A plurality of reflective surfaces 32, for example, four as shown in FIG. 3, are provided on the side surfaces of the mirror 30, which is a polygon mirror.

[0020] The bottom 31 is provided below the reflecting surface 32 of the mirror 30. An inner peripheral portion 311 of the bottom 31, which is close to a hole or inner peripheral portion 35 supported by the base 21, protrudes downward relative to the remaining portion, an outer peripheral portion 312. The inner peripheral portion 311 of the bottom 31, which is supported by the base 21, is connected to a part of the inner surface 33 of the mirror 30. The top surface 34 is provided above the reflecting surface 32 of the mirror 30. The hole or inner peripheral portion 35 forms a hole that penetrates the mirror 30 in the axial direction from the top surface 34 to the bottom 31. As shown in FIGS. 1 and 2 , a sleeve 20 is attached to the hole or inner peripheral portion 35.

[0021] 1 and 2, the inner surface 33 is disposed to face the outer surface 22 of the sleeve 20 when the sleeve 20 is attached to the hole or inner periphery 35. The inner surface 33 of the mirror 30 is inclined with respect to the outer surface 22 of the sleeve 20. The inner surface 33 is disposed, for example, to protrude from the hole or inner periphery 35 toward the sleeve 20. As shown in FIG. 3, a plurality of inner surfaces 33, for example, four inner surfaces 33, are provided. An end 331 of the inner surface 33 on the bottom 31 side is in contact with the outer surface 22 of the sleeve 20 in the axial direction.

[0022] The inner surface 33 is not limited to a portion protruding from the hole or inner periphery 35, but may be the inner periphery itself that forms the hole or inner periphery 35. The hole or inner periphery 35 may also be inclined with respect to the outer surface 22 of the sleeve 20, similar to the inner surface 33.

[0023] The sleeve 20 has an inner surface 23 fixed to an outer surface 411 of the shaft 41. The sleeve 20 has a recess 25 as shown in Fig. 2 in addition to the base 21, outer surface 22, inner surface 23, and groove 28 shown in Fig. 1. The above-mentioned components of the sleeve 20 may be provided integrally or separately.

[0024] The base 21 is provided on a lower portion (part) of the sleeve 20. The base 21 is formed in a disk shape or a nearly disk shape centered on the axis 41. The base 21 supports the bottom 31 of the mirror 30. The base 21 is provided with a flat surface 211 and a protrusion 212. The flat surface 211 faces the bottom 31 of the mirror 30 and is formed in a flat or nearly flat shape. The protrusion 212 is provided on the flat surface 211 so as to protrude upward toward the bottom 31.

[0025] The outer surface 22 is formed in a cylindrical or substantially cylindrical shape with its axis aligned in the longitudinal direction of the sleeve 20. The portion of the outer surface 22 above the base 21 faces the inner surface 33 of the mirror 30.

[0026] The recess 25 is provided in a portion of the outer surface 22 of the sleeve 20 above the base 21 in the axial direction. For example, the recess 25 is provided in a portion of the outer surface 22 above the base 21 so as to include an area facing the inner surface 33 of the mirror 30. The recess 25 is formed in a concave shape that is recessed radially from the outer surface 22. More specifically, the outer surface 22 leading to the recess 25 is inclined toward the axis 41 from a part of the outer surface 22 facing the end 331 on the bottom 31 side of the mirror 30 to another part of the outer surface 22 facing the end on the top surface 34 side. Furthermore, the outer surface 22 leading to the recess 25 has a surface curved toward the axis 41 and is connected to the recess 25. In particular, another part of the outer surface 22 near the recess 25 (or connected to the recess 25) is significantly inclined toward the axis 41. Furthermore, the outer surface 22 of the sleeve 20 and the inner surface 33 of the mirror 30 are formed so that, on the outer surface 22 leading to the recess 25, the gap between the end portion on the top surface 34 side of the mirror 30 and another portion of the outer surface 22 facing the end portion on the top surface 34 side is larger than the gap between the end portion 331 on the bottom portion 31 side of the mirror 30 and the portion of the outer surface 22 facing the end portion 331. In the illustrated example, a portion of the recess 25 is positioned opposite the top surface 34 of the mirror 30. This is not limiting, and the recess 25 may be located above or below the top surface 34 of the mirror 30. When assembling the motor 1, the inner peripheral portion of the mirror 30 is fitted onto the outer surface 22 of the sleeve 20 from above, and the outer peripheral portion 312 of the mirror 30 is mounted on the annular base 21. Thereafter, the inner peripheral portion of the elastic member (spring) 27 is fitted onto the outer surface 22 of the sleeve 20 from above, and the elastic member 27 is moved downward until the end of the elastic member 27 fits into the recess 25 of the sleeve 20. When the end of the elastic member 27 fits into the recess 25 of the sleeve 20, a portion of the elastic member 27 presses the mirror 30 toward the base 21 with an appropriate elastic force. By setting the angle of the recess 25 relative to the axis of the outer surface 22 at a predetermined angle (<45°), deformation of the elastic member 27 on the inside of the sleeve 20 can be suppressed. In addition, the elastic member 27 is tensioned against the recess 25, so that a large force is applied in the axial direction. If the angle of the recess 25 relative to the axis of the outer surface 22 is set to a predetermined angle greater than 45°, force is more likely to be applied in the radial direction, so it is desirable to set the angle to be less than 45°.

[0027] The groove 28 is provided on the outer surface 22 of the sleeve 20 below the base 21. As described above, the hole portion (or inner periphery) 64 of the rotor 42 is fixed in the groove 28.

[0028] The resin 80 is a bonding material such as an adhesive. The resin 80 connects the mirror 30 and the sleeve 20 in the radial direction between the inner surface 33 of the mirror 30 and the outer surface 22 of the sleeve 20. That is, the resin 80 fills the gap between the inner surface 33 of the mirror 30 and the outer surface 22 of the sleeve 20 in the radial direction. The resin 80 also covers the recess 25. The resin 80 also fills the gap between the inner portion 311 of the bottom 31 of the mirror 30 and the flat surface 211 located on the inner side of the protrusion 212 of the base 21 of the sleeve 20. In other words, the resin 80 fills the space surrounded by the inner portion 311 of the bottom 31 of the mirror 30, the protrusion 212, and the inner flat surface 211. The inner flat surface 211 has a downwardly recessed portion, and the resin is also filled in this recessed portion.

[0029] [Operation of the Motor] Next, the operation of the motor 1 having the above-described configuration will be described.

[0030] The motor 1 includes a sleeve 20 having a base 21, and a mirror 30 having a bottom 31 supported in the axial direction by the base 21. In the motor 1, an inner surface 33 of the mirror 30 is inclined with respect to an outer surface 22 of the sleeve 20, and the inner surface 33 and the outer surface 22 are connected in the radial direction via a resin 80. In the motor 1, a gap between the inner surface 33 and the outer surface 22 in the radial direction may be filled with resin, thereby connecting the inner surface 33 and the outer surface 22.

[0031] In the motor 1, the inner surface 33 of the mirror 30, which is connected to the sleeve 20 via the resin 80, is inclined, and the radial width (diameter) of the hole surrounded by the inner surface 33 decreases from one side to the other in the axial direction, for example, from the top to the bottom (tapered shape).

[0032] In the motor 1 , an end 331 of the inner surface 33 on the bottom 31 side may be in contact with the outer surface 22 in the axial direction.

[0033] The motor 1 may have a recess 25 on the outer surface 22 of the sleeve 20 in the radial direction, and the resin 80 may cover the recess 25 .

[0034] With the above-described configuration, in the motor 1, when the resin 80, such as an adhesive, hardens, the end 331 of the inner surface 33 shown in FIG. 2 creates a wedge effect on the hardened resin 80, and the mirror 30 functions as a retainer for the sleeve 20. In particular, by forming the groove 251 in the recess 25, the hardened resin 80 bites into the groove 251, and the mirror 30 is caught in the axial direction via the resin 80. Therefore, the resin 80 biting into the groove 251 prevents the mirror 30 from coming off the sleeve 20.

[0035] Furthermore, with the above-described configuration, the contact area between the inner surface 33 and the outer surface 22 of the mirror 30 is reduced in the motor 1 compared to when the inner surface 33 is in contact with the outer surface 22 along the inner surface 33. Therefore, in the motor 1, the reflective surface 32 of the mirror 30 is less susceptible to the effects of thermal expansion.

[0036] Furthermore, by configuring the motor 1 as described above, when the mirror 30 and the sleeve 20 are fixed using the resin 80, it is not necessary to have a fixing portion such as a spring protrude from the upper surface 34 of the mirror 30, which makes it possible to reduce the size and thickness of the motor 1. Note that the mirror 30 may be fixed using a spring or the like as needed, and this disclosure should not be construed as excluding the use of a spring or the like to fix the mirror 30.

[0037] In the axial direction, the motor 1 may have an inner peripheral portion 311 of the bottom 31 of the mirror 30 that is supported by the base 21 protruding relative to the outer peripheral portion 312, and the inner peripheral portion 311 may form part of the inner surface 33 of the mirror 30.

[0038] By configuring the motor 1 as described above, the mirror 30 has an inner circumferential portion 311 that protrudes below the lower end of the reflective surface 32, forming a spigot shape that fits into the sleeve 20, making it possible to reduce the contact area between the mirror 30 and the sleeve 20, and therefore making the reflective surface 32 less susceptible to the effects of stress generated by the difference in thermal expansion between the mirror 30 and the sleeve 20.

[0039] Therefore, the motor 1 can improve the fixation between the mirror 30 and the sleeve 20 .

[0040] [Modification] FIG. 4 is a cross-sectional view that schematically shows the configuration of a motor 1B according to a first modification of the present invention.

[0041] Motor 1B differs from motor 1 described above in that, in the axial direction, the upper surface 26 of sleeve 20B is at approximately the same height as the upper surface 34 of mirror 30, and that recess 25 is formed below the upper surface 26 of sleeve 20B, with the outer surface of sleeve 20B being formed between recess 25 and upper surface 26.

[0042] Like motor 1, motor 1B comprises a sleeve 20B having a base 21 and a mirror 30 having a bottom 31 supported on the base 21 in the axial direction, with the inner surface 33 of the mirror 30 inclined relative to the outer surface 22 of the sleeve 20B, and the inner surface 33 and outer surface 22 connected radially via resin 80.

[0043] The recess 25 is provided in a portion of the outer surface 22 of the sleeve 20 above the base 21 in the axial direction. For example, the recess 25 is provided in a portion of the outer surface 22 above the base 21 so as to include an area facing the inner surface 33 of the mirror 30. The recess 25 is formed in a concave shape that is recessed radially from the outer surface 22. More specifically, the outer surface 22 leading to the recess 25 is inclined toward the axis 41 from a part of the outer surface 22 facing the end 331 on the bottom 31 side of the mirror 30 to another part of the outer surface 22 facing the end on the top surface 34 side. Furthermore, the outer surface 22 leading to the recess 25 has a surface curved toward the axis 41 and is connected to the recess 25. In particular, another part of the outer surface 22 near the recess 25 (or connected to the recess 25) is significantly inclined toward the axis 41. Furthermore, the outer surface 22 of the sleeve 20 and the inner surface 33 of the mirror 30 are formed so that, on the outer surface 22 leading to the recess 25, the gap between the end portion on the top surface 34 side and another portion of the outer surface 22 facing the end portion on the top surface side is larger than the gap between the end portion 331 on the bottom portion 31 side of the mirror 30 and the part of the outer surface 22 facing the end portion 331. Furthermore, the recess 25 is formed below the top surface 26 of the sleeve 20B, and the outer surface of the sleeve 20B is formed between the recess 25 and the top surface 26.

[0044] The resin 80 is a bonding material such as an adhesive. The resin 80 connects the mirror 30 and the sleeve 20 in the radial direction between the inner surface 33 of the mirror 30 and the outer surface 22 of the sleeve 20. That is, the resin 80 fills the gap between the inner surface 33 of the mirror 30 and the outer surface 22 of the sleeve 20 in the radial direction. The resin 80 also covers the recess 25. The resin 80 also fills the gap between the inner portion 311 of the bottom 31 of the mirror 30 and the flat surface 211 located on the inner side of the protrusion 212 of the base 21 of the sleeve 20. In other words, the resin 80 fills the space surrounded by the inner portion 311 of the bottom 31 of the mirror 30, the protrusion 212, and the inner flat surface 211. The inner flat surface 211 has a downwardly recessed portion, and the resin is also filled in this recessed portion.

[0045] As described above, in motor 1B, the mirror 30 and sleeve 20B are fixed in the axial direction using resin 80, so that the upper surface 26 of sleeve 20B can be configured to be at approximately the same height as the upper surface 34 of mirror 30, as in motor 1B shown in Figure 4, making it possible to make the motor smaller and thinner.

[0046] FIG. 5 is a cross-sectional view that schematically shows the configuration of a motor 1C according to a second modified example of the present invention.

[0047] As shown in FIG. 5, the motor 1C differs from the motors 1 and 1B described above in that the sleeve 20C has a spring 27 that supports the upper surface 34 of the mirror 30.

[0048] Like the motors 1 and 1B, the motor 1C includes a sleeve 20C having a base 21 and a mirror 30 having a bottom 31 supported by the base 21 in the axial direction. The inner surface 33 of the mirror 30 is inclined relative to the outer surface 22 of the sleeve 20C, and the inner surface 33 and the outer surface 22 are connected in the radial direction via resin 80. The sleeve 20C is formed with a recess 241 for fixing the spring 27. The recess 241 is provided in a portion of the outer surface 22 of the sleeve 20 above the base 21C in the axial direction. For example, the recess 241 is provided in a portion of the outer surface 22 of the sleeve 20 above the region facing the inner surface 33 of the mirror 30. The recess 241 is formed in a concave shape that is recessed radially from the outer surface 22.

[0049] As described above, in addition to fixing the mirror 30 and the sleeve 20C using resin 80, as in motor 1C, the mirror 30 can be fixed more securely to the sleeve 20C by fixing the mirror 30 using a fixing part such as spring 27.

[0050] FIG. 6 is a cross-sectional view that schematically shows the configuration of a motor 1D according to a third modified example of the present invention.

[0051] As shown in FIG. 6 , motor 1D, like motor 1D, includes a spring 27D supporting an upper surface 34D of mirror 30D on a sleeve 20D. A recess 241 for securing spring 27D is formed in sleeve 20D. The recess 241 is provided axially above a base 212D on the outer surface 22D of sleeve 20D. For example, the recess 241 is provided above a region of the outer surface 22D of sleeve 20D that faces an inner surface 33D of mirror 30D. The recess 241 is formed in a radially recessed shape relative to the outer surface 22D. In motor 1D, the reflective surface 32D, inner surface 33D, and hole or inner peripheral portion 35D of mirror 30D are larger than those of mirror 30D. Furthermore, due to the difference in the shape of mirror 30D, the shape of the base 21 provided on the sleeve 20D in motor 1D differs from that of motors 1, 1B, and 1C described above.

[0052] Like the motors 1, 1B, and 1C, the motor 1D includes a sleeve 20D having a base 212D and a mirror 30D having a bottom 31D supported on the base 212D in the axial direction. An inner surface 33D of the mirror 30D is inclined relative to an outer surface 22D of the sleeve 20D, and the inner surface 33D and the outer surface 22D are connected in the radial direction via resin 80. The inner surface 33D protrudes from, for example, a hole or an inner peripheral portion 35D toward the sleeve 20D. Similar to the inner surface 33 of the mirror 30 shown in FIG. 3 , multiple inner surfaces 33D (e.g., four) are provided. An end 331D of the inner surface 33D on the bottom 31D side contacts the outer surface 22D of the sleeve 20D in the axial direction. The outer surface 22D is spaced a predetermined distance (the length of the flat surface 211D in this embodiment) from the outer peripheral surface of the sleeve 20D in the radial direction. Therefore, a space S is formed between the inner surface 33D of the mirror 30D and the outer surface 22D of the sleeve 20D. A portion (one end) of the elastic member 27D is provided on the upper surface 34D of the mirror 30D so as to span this space S, and another portion (the other end) of the elastic member 27D is fixed to the outer surface 22D of the sleeve 20D. In addition, a recess 25 is formed in the sleeve 20D. The recess 25 is provided in a portion of the outer surface 22D of the sleeve 20D above the base 212D in the axial direction. For example, the recess 25 is provided in a portion of the plane 211D above the base 212D so as to include an area facing the inner surface 33 of the mirror 30D. The recess 25 is formed in a concave shape that is recessed radially from the outer surface 22D.

[0053] The recess 25 is provided in a portion of the outer surface 22D of the sleeve 20D above the base 212D in the axial direction. For example, the recess 25 is provided in a portion of the outer surface 22D above the base 212D so as to include an area facing the inner surface 33D of the mirror 30D. The recess 25 is formed in a concave shape that is recessed radially from the outer surface 22D. Specifically, the outer surface 22D leading to the recess 25 is inclined toward the axis 41 from a portion of the outer surface 22D facing the end 331D of the bottom 31D of the mirror 30D to another portion of the outer surface 22D facing the end of the top surface 34D. Furthermore, the outer surface 22D leading to the recess 25 has a surface curved toward the axis 41 and is connected to the recess 25. In particular, another portion of the outer surface 22D near the recess 25 (or connected to the recess 25) is significantly inclined toward the axis 41. Furthermore, on the outer surface 22D leading to the recess 25, the outer surface 22D of the sleeve 20D and the inner surface 33D of the mirror 30D are formed so that the gap between the end portion on the top surface 34D side and another portion of the outer surface 22D facing the end portion on the top surface side is larger than the gap between the end portion 331D on the bottom portion 31D side of the mirror 30D and the part of the outer surface 22D facing the end portion 331D. Furthermore, the recess 25 is formed below the top surface 34D of the mirror 30D.

[0054] The resin 80 is a bonding material such as an adhesive. The resin 80 radially connects the mirror 30D and the sleeve 20D between the inner surface 33D of the mirror 30D and the outer surface 22D of the sleeve 20D. That is, the resin 80 fills the gap between the inner surface 33D of the mirror 30D and the outer surface 22D of the sleeve 20D in the radial direction. The resin 80 also covers the recess 25. The resin 80 also fills the gap between the inner portion 311D of the bottom 31D of the mirror 30D and the surface 211E of the sleeve 20D that is located more inward than the base 212D. In other words, the resin 80 fills the space surrounded by the inner portion 311D of the bottom 31D of the mirror 30D, the base 212D, and the inner surface 211E. The inner surface 211E has a downwardly recessed portion, and the resin is also filled in this recessed portion. With the above configuration, in the motor 1D, when the resin 80, such as an adhesive, hardens, the end 331D of the inner surface 33D shown in FIG. 6 creates a wedge effect on the hardened resin 80, thereby preventing the mirror 30D from coming off the sleeve 20D. Furthermore, by forming a groove 251 in the recess 25, the hardened resin 80 bites into the groove 251, and the mirror 30D is caught in the axial direction via the resin 80. Therefore, the resin 80 biting into the groove 251 prevents the mirror 30D from coming off the sleeve 20D.

[0055] In the motor 1D, the mirror 30D and the sleeve 20D are fixed together using resin 80. Also, instead of using resin 80 to fix the mirror 30D and the sleeve 20D, the mirror 30D may be fixed together using an elastic member such as a spring 27D. With this configuration, even if the mirror 30D is large, it can be fixed to the sleeve 20D more reliably.

[0056] In addition, those skilled in the art can appropriately modify the present invention in accordance with conventionally known knowledge. As long as such modifications still comprise the structure of the present invention, they are of course included in the scope of the present invention.

[0057] For example, although the motors 1, 1B, 1C, and 1D described above all have a structure in which the shaft 41 is fixed, the shaft 41 may be a rotating shaft.

[0058] DESCRIPTION OF SYMBOLS 1, 1B, 1C, 1D...motor, 2...stator, 3...coil, 9...base, 20, 20B, 20C, 20D...sleeve, 21...base, 22, 22D...outer surface, 23...inner surface, 24...insulator, 25, 241...recess, 26...upper surface, 27, 27D...spring (elastic member), 28...groove, 29...magnetic material, 30, 30D...mirror, 31, 31D...bottom, 32, 32D...reflection surface, 33, 33D...inner surface, 34, 34D...upper surface, 35, 35D...inner periphery, 41...shaft, 42...rotor, 43...magnet, 62...tubular portion, 63...top surface, 64...inner periphery, 80...resin, 211...flat surface, 212...protrusion, 212D...base, 211E...inner periphery surface, 251...groove, 311, 311D...inner periphery portion, 312...outer periphery, 331, 331D...end, 411...outer surface

Claims

1. A motor comprising: a sleeve having a base; and a mirror having a bottom supported by the base in the axial direction, wherein the inner surface of the mirror is inclined relative to the outer surface of the sleeve; and the inner surface of the mirror and the outer surface of the sleeve are connected in the radial direction via resin.

2. The motor according to claim 1, wherein the bottom end of the inner surface of the mirror is in contact with the outer surface of the sleeve in the axial direction.

3. The motor according to claim 1 or 2, wherein the outer surface of the sleeve has a recess in the radial direction, and the resin covers the recess.

4. A motor according to claim 1 or 2, wherein the portion of the bottom of the mirror that is supported by the base protrudes relative to the other portions, and the portion that is supported by the base forms part of the inner surface of the mirror.

5. The motor according to claim 1 or 2, wherein the resin is filled in a gap between the inner surface of the mirror and the outer surface of the sleeve in the radial direction.

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