JP3744848B2 - Motor equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor device mounted on an electric / electronic device such as a laser printer.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a motor device mounted on a laser printer or the like has a configuration as shown in FIG.
[0003]
This motor device includes a motor body composed of a rotor part 31 and a stator part 29, a circuit board 3 on which an electronic circuit for driving the motor body is arranged, and a base for attaching the motor body to an electric / electronic device. The member 1 is provided.
[0004]
The circuit board 3 is provided with printed wiring on the metal plate for driving the motor body via an insulating film.
[0005]
The stator portion 29 of the motor body fixes the stator core 7 around which the drive coil 9 is wound to the housing 5, passes the housing 5 through the insertion hole of the circuit board 3, and contacts the flange portion 6 of the housing 5 with the circuit board 3. It is placed in contact. Although not shown, the circuit board 3, the housing 5, and the stator core 7 are integrally fixed by a known means such as a screw. A bearing 11 such as a sintered oil-impregnated bearing is press-fitted and fixed in the housing 5.
[0006]
The rotor portion 31 of the motor body is formed by fixing the shaft 13 to the rotor case 17 via the boss 15 and fixing the drive magnet 19 to the rotor case 17 at a position facing the tip of the stator core 7. By inserting the shaft 13 into the bearing 11, the shaft 13 is rotatably supported by the stator portion 29. Reference numeral 21 denotes a polygon mirror that is placed on the boss 15 to reflect the laser beam, 23 is a holding piece for holding down the polygon mirror 21, and 25 is a shaft 13 for fixing the holding piece 23. The screw is screwed in, 33 is a seal for preventing oil leakage from the bearing 11, and 35 is a thrust plate for supporting the load in the thrust direction of the rotor portion.
[0007]
In such a motor device, when the drive coil 9 is switched and energized by an electronic circuit (not shown) mounted on the circuit board 3, rotational stress is applied to the drive magnet 19, and the rotor portion 31 rotates.
[0008]
Further, such a motor device is installed at a predetermined location of an electric / electronic device by fixing the circuit board 3 to the base member 1 by a fixing member 27 such as a screw. In addition, in the structure of this motor apparatus, although the housing 5 is partially embedded in the base member 1, the motor apparatus related to this invention is not limited to this structure.
[0009]
[Problems to be solved by the invention]
In such a motor device, the metal circuit board 3 is flattened by pressing and rolling the circuit board between two rollers, and the motor body (housing 5) mounting surface is adjusted by a leveler. The circuit board 3 has printed wiring on the substrate, but the leveler is only at a pressure that does not damage the printed wiring in these processes. Since it is difficult to achieve flatness because it cannot be applied, and the motor body is fixed with only the circuit board 3 while maintaining the motor body's axial perpendicularity, the verticality and fixing rigidity become unstable. There was a risk of causing problems such as vibration when driving. If the thickness of the circuit board is increased, the fixing rigidity can be increased, but the flatness of the circuit board cannot be increased for the above-described reason, and therefore the verticality cannot be improved.
[0010]
Further, the circuit board 3 in FIG. 3 is easily restricted to a planar shape due to the nature of mounting an electronic circuit, so that it is difficult to quickly adjust the mounting position when it is mounted on the base member 1, and a work loss occurs in mounting the motor body. Has occurred. In the structure in which the housing 5 is partially embedded in the base member 1 as in the present motor device, the installation position can be specified to some extent, but the embedded portion of the base member 1 in the housing 5 is substantially cylindrical. Therefore, the positioning of the motor body in the circumferential direction is still difficult to match the mounting position, resulting in a work loss in mounting the motor body.
[0011]
Further, in order to increase the fixing rigidity and suppress the vibration at the time of motor rotation, there is a structure in which the lower surface of the circuit board 3 is brought into contact with the upper surface of the base member 1 and fixed, although not shown. Since the flatness of the substrate 3 has been difficult to obtain, the problem that the perpendicularity of the motor body remains incomplete remains, and the influence of the planar accuracy of the contact surface of the base member 1 with the circuit substrate 3 also appears.
[0012]
Further, in such a motor structure, there is a problem with regard to the reduction in thickness of the motor device because of the structure in which the motor body having the polygon mirror 21 attached to the upper portion of the rotor portion 31 is fixed to the base member 1.
[0013]
[Means for Solving the Problems]
A motor device according to the present invention includes a motor body composed of a rotor portion and a stator portion, a circuit board on which an electronic circuit for driving the motor body is disposed, a plate member composed of a press-formed metal plate, and the plate A motor device comprising a base member that supports the motor body via a member,
The circuit board is fixed to the plate member with the lower surface of the circuit board facing the upper surface of the plate member,
The motor body is fixed to the plate member by bringing the stator portion of the motor body into contact with the upper surface of the plate member without contacting the circuit board,
The plate member is fixed to the base member with the lower surface of the plate member opposed to the upper surface of the base member.
[0014]
According to the configuration of the present invention, as the support member of the motor body, a plate member that is press-molded independently and can be applied with a higher leveler pressure is used to obtain better flatness than a circuit board. Therefore, the accuracy of the perpendicularity of the motor body fixedly supported by the plate member is improved.
[0015]
In addition, the upper surface of the base member is provided with a protruding portion for restricting relative arrangement with the plate member and serving as a fixing means for the plate member, and the plate member is fitted with the protruding portion of the base member. Since it is press-molded into a shape having a part, when the plate member is attached to the base member, the attachment position can be easily adjusted, and the attachment can be carried out smoothly, and the motor body can be as much as the height of the protrusion. Is attached so as to sink into the base member, the thickness of the entire motor device including the base member after the base member is attached is reduced.
[0016]
In addition, even if the structure in which the lower surface of the plate member is fixed in contact with the upper surface of the base member is adopted, the flatness of the plate member is excellent, although it is affected by the planar accuracy of the plate member substantially contacting surface of the base member. As a result, the fixing rigidity is increased while maintaining the accuracy of the perpendicularity of the motor body, and vibration during motor rotation can be suppressed.
[0017]
In addition, in the motor device that employs a structure in which the lower surface of the plate member and the upper surface of the base member are fixed to each other with a portion facing each other, the plate member is substantially brought into contact with the base member and fixed. Although the fixing rigidity is somewhat lowered, there is no problem with respect to the strength of the fixing rigidity of the motor body because the circuit board is fixed to the plate member rather than the conventional fixing support of the motor body only by the circuit board. Since the lower surface of the plate member and the upper surface of the base member are separated from each other, the planar accuracy of the surface of the base member has no effect on the plate member except for the base member fixing portion of the plate member. The degree of perpendicularity becomes even better.
[0018]
Furthermore, in the present invention, the plate member can be press-molded into a shape having a plurality of protrusions on the upper surface, and since the plate member is not planar, the fixing rigidity of the motor body is further improved, and the motor rotation Suppression of vibration at the time becomes better. In addition, since the accuracy of the perpendicularity of the motor main body is kept good, and the flatness of the circuit board is not particularly limited in the present invention, the protruding portion is fixed by bringing the circuit board into contact with the protruding shape. In this case, it is only necessary that a virtual plane is formed in a region in contact with the circuit board at the tip of the protruding portion so that the flatness with respect to the motor main body is obtained so that the circuit board does not interfere with other parts. .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which is common in a prior art example, and description is abbreviate | omitted.
[0020]
FIG. 1 is a sectional view (partially half sectional view) showing an embodiment of a motor device according to the present invention. In addition, in order to make the drawing easy to see, diagonal lines representing a cross section are given only to the base member.
[0021]
In FIG. 1, the parts different from the conventional example are a base member 41, a circuit board 43, and a plate member 45, and the other parts are the same as the conventional structure.
[0022]
The base member 41 has, on its upper surface, a protrusion 41a that regulates the relative arrangement with the plate member 45 and is used for fixing to the plate member 45 by a fixing member 27 such as a screw. The shape, number, and length of the protrusion 41a are arbitrary as long as they do not affect the characteristics and operation of the motor.
[0023]
The plate member 45 is made of, for example, a metal material such as iron, or a so-called static steel plate having a two-layer structure of resin and metal, on which the circuit board 43 is placed, and the housing 5 and the drive coil 9 are wound. The motor body including the stator portion 29 formed from the stator core 7 and the shaft 13, the boss 15, the rotor case 17, and the rotor portion 31 formed from the drive magnet 19 does not come into contact with the upper surface of the circuit board 43. It is abuttingly fixed to the upper surface.
[0024]
The plate member 45 supports the motor body, specifically, a protrusion formed on the base member 41 so as to improve the flatness of the fixing surface 45b which is the entire surface on the side where the housing 5 is fixed. It is press-molded so as to be molded into a shape having a fitting portion 45a that is a portion fitting with 41a.
[0025]
By adjusting the length of the protrusion 41a of the base member 41 or the fitting portion 45a of the plate member 45, the base member 41 and the plate member 45 can be substantially in contact with each other or separated from each other. is there.
[0026]
Since the press molding is no longer necessary, the material of the circuit board 43 is not limited to a metal material, and can be constituted by an inexpensive material such as paper phenol resin or glass epoxy resin.
[0027]
In this configuration, the plate member 45 is press-molded alone and a higher flatness is obtained by applying a higher leveler pressure. Therefore, the perpendicularity of the motor body fixed to the plate member 45 is also accurate. Become. In addition, since the protrusion 41a is formed on the base member 41 and the plate member 45 is pressed to form the fitting portion 45a that fits the protrusion 41a, the plate member 45 is attached to the base member 41. That is, when the motor main body is attached to the base member 41, the attachment position can be easily adjusted, the attachment can be performed smoothly, and the motor main body sinks into the base member by the height of the protrusion 41a. Therefore, the thickness of the entire motor device including the base member when the motor body is attached is also reduced.
[0028]
Further, when a structure in which the lower surface of the plate member 45 and the upper surface of the base member 41 are substantially brought into contact with each other when the plate member 45 is attached to the base member 41 is adopted, the plane of the substantially contact surface with the plate member 45 of the base member 41 is adopted. Although there is an influence of accuracy, the flatness of the plate member 45 is obtained well, so that the fixing rigidity is increased and the vibration during motor rotation is suppressed while maintaining the accuracy of the verticality of the motor body. Is possible.
[0029]
Further, the height of the protruding portion 41a of the base member 41 or the fitting portion 45a of the plate member 45 is adjusted so that the lower surface of the plate member 45 and the upper surface of the base member 41 are spaced apart and face each other. If formed, although the fixing rigidity is slightly reduced as compared with the configuration in which the plate member 45 is substantially in contact with the base member 41, the circuit board 43 is fixed to the plate member 45 instead of fixing the motor body only by the conventional circuit board. Therefore, there is no problem with respect to the strength of the fixing rigidity of the motor body, and the flatness of the surface of the base member 41 other than the fixing portion of the plate member 45 is reduced due to the separation from the base member 41. The member 45 is not affected at all, and the perpendicularity of the motor body becomes even better.
[0030]
FIG. 2 is a sectional view (partially half sectional view) showing another embodiment of the present invention. As in FIG. 1, in order to make the drawing easier to see, the diagonal lines representing the cross section are given only to the base member. In FIG. 2, corrugated protrusions are press-molded on the housing 5 of the plate member 53 and the contact surface 53 b of the circuit board 43.
[0031]
In this configuration, the fixing rigidity of the motor body is further improved as compared with the planar plate member, and the suppression of vibration and the like during motor rotation is improved.
[0032]
Note that the protrusion of the contact surface 53b maintains good accuracy of the verticality of the motor body, and the mounting portion of the circuit board 43 has no particular limitation on the flatness of the circuit board 43. When the circuit board 43 is fixed in contact with the projecting portion, the circuit board 43 at the tip of the projecting portion has a flatness with respect to the motor body so that the circuit board 43 does not interfere with other parts. If an imaginary plane is formed in the region in contact with 43, the shape is arbitrary.
[0033]
In the embodiment of FIG. 2, the surface of the plate member 53 facing the base member 41 can be substantially in contact with the base member 41, but in this structure, the vibration at the time of full rotation of the motor is possible even with the structure of the plate member 53 alone. Therefore, it is possible to obtain a more remarkable effect by applying the present structure to a configuration having a portion facing and separating the plate member 53 and the base member 41 from each other.
[0034]
In the above embodiment, a circumferentially opposed motor has been described as an example. However, the present invention is not limited to this, and the present invention can also be implemented by a surface-facing motor, and the type of motor is a known motor such as a brushless motor. Can be implemented.
[0036]
【The invention's effect】
As described above, the motor device according to the present invention includes a motor body composed of a rotor part and a stator part, a circuit board on which an electronic circuit for driving the motor body is arranged, and a press-formed metal plate. A motor device comprising a plate member and a base member that supports the motor body via the plate member, wherein the circuit board has the lower surface of the circuit board opposed to the upper surface of the plate member, and the plate The motor main body is fixed to the plate member by bringing the stator portion of the motor main body into contact with the upper surface of the plate member without contacting the circuit board, and the plate member is fixed to the plate member. The lower surface of the member faces the upper surface of the base member and is fixed to the base member. In addition, since it is possible to apply a higher leveler pressure, a plate member that can obtain better flatness than the circuit board is used. Therefore, the verticality of the motor body fixedly supported by the plate member is also accurate. Become.
[0037]
Further, the upper surface of the base member is provided with a protruding portion for restricting the relative arrangement with the plate member and serving as a fixing means for the plate member, and the plate member is pressed into a shape having a portion that fits with the protruding portion of the base member. Because it is molded, when attaching the plate member to the base member, the attachment position can be easily adjusted, the attachment is performed smoothly, and the motor body is placed in the base member by the height of the protruding part. Since it is attached so as to sink, the thickness of the entire motor device including the base member after the base member is attached becomes thin.
[0038]
Further, in the structure in which the lower surface of the plate member is fixed in contact with the upper surface of the base member, the fixing rigidity is increased while maintaining the accuracy of the perpendicularity of the motor body, and vibration during motor rotation can be suppressed. .
[0039]
In addition, in a motor device that employs a structure in which the lower surface of the plate member and the upper surface of the base member are fixed to each other with a portion facing each other, the planar accuracy of the surface of the base member is high except for the fixed portion of the plate member. The plate member is not affected at all, and the perpendicularity of the motor body becomes even better. Furthermore, in the present invention, the plate member can be press-molded into a shape having a plurality of protrusions on the upper surface, and since the plate member is not planar, the fixing rigidity of the motor body is further improved, and the motor rotation Suppression of vibration at the time becomes better.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view (partially half-sectional view) of a motor device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view (partially half-sectional view) of a motor device according to another embodiment of the present invention.
FIG. 3 is a sectional view (partially half sectional view) of a conventional motor device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base member 3 Circuit board 5 Housing 6 Flange part 7 Stator core 9 Drive coil 11 Bearing 13 Shaft 15 Boss 17 Rotor case 19 Drive magnet 21 Polygon mirror 23 Holding piece 25 Screw 27 Fixing member (screw)
29 Stator portion 31 Rotor portion 33 Seal 35 Thrust plate 41 Base member 43 Circuit board 45 Plate member 53 Plate member

Claims (5)

A motor body comprising a rotor part and a stator part, a circuit board on which an electronic circuit for driving the motor body is disposed, a plate member comprising a press-formed metal plate, and the motor body via the plate member A motor device comprising a base member for supporting
The circuit board is fixed to the plate member with the lower surface of the circuit board facing the upper surface of the plate member,
The motor body is fixed to the plate member by bringing the stator portion of the motor body into contact with the upper surface of the plate member without contacting the circuit board,
The plate member is fixed to the base member with the lower surface of the plate member facing the upper surface of the base member,
On the upper surface of the base member, there is provided a protrusion that regulates the relative arrangement with the plate member and serves as a fixing means with the plate member,
The said plate member is press-molded in the shape which has a part fitted with the protrusion part of the said base member, The motor apparatus characterized by the above-mentioned. The motor device according to claim 1 , wherein the lower surface of the plate member and the upper surface of the base member have portions that are spaced apart from each other and face each other. A motor body comprising a rotor part and a stator part, a circuit board on which an electronic circuit for driving the motor body is disposed, a plate member comprising a press-formed metal plate, and the motor body via the plate member A motor device comprising a base member for supporting
The circuit board is fixed to the plate member with the lower surface of the circuit board facing the upper surface of the plate member,
The motor body is fixed to the plate member by bringing the stator portion of the motor body into contact with the upper surface of the plate member without contacting the circuit board,
The plate member is fixed to the base member with the lower surface of the plate member facing the upper surface of the base member,
The motor device according to claim 1, wherein the lower surface of the plate member and the upper surface of the base member have portions that are separated from each other and face each other. A motor body comprising a rotor part and a stator part, a circuit board on which an electronic circuit for driving the motor body is disposed, a plate member comprising a press-formed metal plate, and the motor body via the plate member A motor device comprising a base member for supporting
The circuit board is fixed to the plate member with the lower surface of the circuit board facing the upper surface of the plate member,
The motor body is fixed to the plate member by bringing the stator portion of the motor body into contact with the upper surface of the plate member without contacting the circuit board,
The plate member is fixed to the base member with the lower surface of the plate member facing the upper surface of the base member,
The plate member is press-molded into a shape having a plurality of protrusions on the upper surface,
The motor device according to claim 1, wherein tips of the plurality of projecting portions constitute a virtual plane in a region where the tips of the motor body are in contact with the stator portion and the circuit board. The plate member is press-molded into a shape having a plurality of protrusions on the upper surface,
Tips of said plurality of projections, the stator portion and the circuit board and the abutting region of the motor body, according to claim 1, wherein any one, characterized in that it constitutes a virtual plane Motor device.

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