JP2019095239A - Electronic apparatus and vibration generator - Google Patents

Abstract

To provide an electronic apparatus and a vibration generator with which it is possible to make a rotor of the vibration generator recognized by a user while preventing the rotor from falling off.SOLUTION: A timepiece 1 comprises: a vibration generator 2 including a stator 3 which is a brushless motor and provided with a coil 33 and a shaft 32 and a rotor 4 including a magnet 43 externally fitted to the shaft 32 and rotatably supported and drawn to the coil 33 and a weight 44 having the center of gravity at a position shifted from the center line C of the shaft 32; and a dial 16 arranged on the opposite side to the coil 33 across the rotor 4 in an axial direction Z of the shaft 32, in which an opening 18 for causing the rotor 4 to be exposed toward the opposite side to the coil 33 in the axial direction Z is formed. In at least a portion of an opening edge 18a of the opening 18 is formed an overlapping part 19 that overlaps the rotor 4 as seen from the axial direction Z.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electronic device and a vibration generator.

  2. Description of the Related Art Conventionally, in electronic devices such as mobile phones, vibration is used as a means for transmitting an incoming call and various information to a user. In order to generate this vibration, a vibration generator (vibration motor) is used (see, for example, Patent Document 1).

  The vibration generator of Patent Document 1 includes a rotor, a stator that supports the rotation of the rotor, and a cover that houses the rotor and the stator. The rotor is extrapolated to the shaft of the stator. The rotor has an eccentric weight that makes the center of gravity of the rotor eccentric. The cover covers the rotor and the stator from at least one side in the axial direction and the outside in the radial direction, with the inner surface in contact with one end of the shaft.

Patent No. 5921743

  By the way, in recent years, there is a demand for allowing a user to visually recognize a state in which a rotor is rotating in an electronic device including a vibration generating device. However, in the vibration generating device of Patent Document 1, since the cover covers the rotor, the user can not visually recognize how the rotor is rotating. Also, if the cover covering the rotor is removed, the rotor may fall off the shaft.

  Therefore, the present invention provides an electronic device and a vibration generating device capable of making a user visually recognize the rotor while preventing the rotor of the vibration generating device from falling off.

  The electronic device according to the present invention is a brushless motor, and includes a stator including a coil and a shaft, and a magnet externally fitted to the shaft to be rotatably supported and attracted to the coil and deviated from a central axis of the shaft A vibration generating device having a rotor having a weight having a center of gravity at a position; and a coil disposed in the axial direction of the shaft opposite to the coil with the rotor interposed therebetween, and the rotor in the axial direction with the coil And a cover portion having an opening portion exposed to the opposite side, and at least a part of the opening edge of the opening portion is formed with an overlapping portion overlapping with the rotor when viewed from the axial direction Are characterized.

  According to the present invention, the cover portion is formed with an opening for exposing the rotor to the side opposite to the coil in the axial direction of the shaft, so that the rotor can be visually recognized from the outside through the opening. Moreover, since the overlapping portion overlapping with the rotor as viewed in the axial direction is formed at the opening edge of the opening, movement of the rotor separated from the coil in the axial direction can be restricted. This can prevent the rotor from falling off the shaft. Therefore, the electronic device can make the user visually recognize the rotor while preventing the rotor of the vibration generating device from falling off.

  In the electronic device described above, it is preferable that the overlapping portion is separated from the rotor in the axial direction.

  In the present invention, since the vibration generating device is a brushless motor and a suction force is generated between the stator and the rotor, the rotor is slid on the overlapping portion when the rotor rotates by separating the overlapping portion from the rotor in the axial direction. It is possible to prevent movement. Therefore, the electronic device can prevent the generation of the sliding noise when the rotor rotates. Further, it is possible to prevent the failure of the electronic device due to the wear of the rotor and the overlapping portion.

  In the above electronic device, it is desirable that the watch be a watch, and the cover be a dial.

  According to the present invention, since it is possible to prevent the rotor from falling off using the dial of the watch, it is not necessary to newly provide a part for preventing the rotor from falling off in the watch provided with the vibration generating device. Therefore, an increase in the number of parts can be suppressed.

  The vibration generating apparatus of the present invention has a stator including a coil and a shaft, and a magnet externally fitted to and rotatably supported by the shaft, having a magnet attracted to the coil, and a center of gravity at a position offset from the central axis of the shaft. A brushless motor having a rotor with a weight and an opposite side to the coil across the rotor in the axial direction of the shaft, and the rotor is directed to the opposite side to the coil in the axial direction And a cover portion having an opening to be exposed, wherein at least a part of the opening edge of the opening has an overlapping portion overlapping with the rotor when viewed from the axial direction. I assume.

  According to the present invention, the cover portion is formed with an opening for exposing the rotor to the side opposite to the coil in the axial direction of the shaft, so that the rotor can be visually recognized from the outside through the opening. Moreover, since the overlapping portion overlapping with the rotor as viewed in the axial direction is formed at the opening edge of the opening, movement of the rotor along the axial direction can be restricted. This can prevent the rotor from falling off the shaft. Therefore, the vibration generator can allow the user to visually recognize the rotor while preventing the rotor from coming off.

  In the above-described vibration generating device, it is desirable that the overlapping portion be separated from the rotor in the axial direction.

  According to the present invention, the stator and the rotor constitute a brushless motor, and a suction force is generated between the stator and the rotor. Therefore, by separating the overlapping portion from the rotor in the axial direction, the rotor is rotated when the rotor rotates. Can be prevented from sliding in the overlapping portion. Therefore, the vibration generating device can prevent the generation of the sliding noise at the time of rotation of the rotor. In addition, it is possible to prevent the failure of the vibration generating device due to the wear of the rotor and the overlapping portion.

  In the above-mentioned vibration generator, it is desirable to have a case that accommodates the rotor, and the cover is a part of the case.

  According to the present invention, by forming the opening in the case for housing the rotor, the rotor can be made visible from the outside, and the rotor can be prevented from falling off using the case. Therefore, in the vibration generating device provided with the case for housing the rotor, it becomes possible to make the user visually recognize the rotor, and the case can be prevented from falling off the rotor without newly providing parts for preventing the falling off of the rotor. .

  According to the present invention, it is possible to make the user visually recognize the rotor while preventing the rotor of the vibration generating device from falling off.

It is a top view of the timepiece of a 1st embodiment. It is sectional drawing which shows the internal structure of the timepiece of 1st Embodiment. It is sectional drawing which shows the internal structure of the timepiece of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described based on the drawings. In the following description, components having the same or similar functions are denoted by the same reference numerals. And duplicate explanation of those composition may be omitted.

First Embodiment
A timepiece 1 (electronic device) according to a first embodiment of the present invention will be described.
FIG. 1 is a plan view of the timepiece according to the first embodiment.
As shown in FIG. 1, the watch 1 is a watch-type analog electronic watch. The watch 1 includes a watch main body 11 and a band 12 attached to the watch main body 11.

  The watch body 11 includes a watch case 13, a movement (not shown) provided in the watch case 13, a vibration generator 2 and a dial 16 (cover). The watch case 13 includes a body 14, a glass 15, and a back cover (not shown). A plurality of hands 8 (hour hand, minute hand and second hand) are disposed between the glass 15 and the dial 16. In the present embodiment, the side on which the glass 15 is located with respect to the back lid is defined as the front side, and the opposite side is defined as the back side. The movement includes a drive unit, a battery, and the like, and controls the drive of the plurality of hands 8.

FIG. 2 is a cross-sectional view showing the internal structure of the timepiece of the first embodiment.
As shown in FIG. 2, the vibration generator 2 is a brushless motor. The vibration generator 2 includes a stator 3 and a rotor 4.

The stator 3 includes a base portion 31, a shaft 32, a coil 33, and a drive portion 34.
The base portion 31 is attached to a circuit board or the like disposed in the watch case 13 (see FIG. 1). The base portion 31 is formed in a flat plate shape. A shaft support hole 37 is formed at the central portion of the base portion 31.

  The shaft 32 is inserted into the shaft support hole 37 of the base portion 31 and is fixed to the base portion 31 so as not to be rotatable. The shaft 32 extends from the first major surface 31 a of the base 31 along the normal direction of the first major surface 31 a of the base 31. The extending direction of the shaft 32 coincides with the front and back direction in the timepiece 1. The shaft 32 extends toward the front side of the timepiece 1. In the following description, the direction of the central axis C of the shaft 32 will be referred to as the axial direction and denoted by the symbol Z, and the direction orthogonal to the axial direction Z and radially extending from the central axis C will be referred to as the radial direction and the symbol R Attached. Further, a circumferential direction around the central axis C is simply referred to as a circumferential direction.

The coil 33 is provided around the shaft 32 on the first major surface 31 a of the base portion 31.
The drive unit 34 is provided on the first major surface 31 a of the base unit 31. The drive unit 34 is connected to an external power supply. The drive unit 34 is electrically connected to the coil 33. The driving unit 34 has a Hall element (not shown), detects the polarity of a magnet 43 (described later) provided on the rotor 4 by the Hall element, and controls the current supplied from the external power supply according to the detected polarity. The coil 33 is supplied.

  The rotor 4 is a rotating body rotatably supported by being extrapolated to the shaft 32 of the stator 3. The rotor 4 includes a bearing 41, a back yoke 42, a magnet 43, and a weight 44.

  The bearing 41 is, for example, a slide bearing such as an oil-impregnated bearing. The bearing 41 is formed in a cylindrical shape. The bearing 41 is extrapolated to the shaft 32 of the stator 3 and provided on the shaft 32 so as to be relatively rotatable. A sliding ring 6 intervenes between the bearing 41 and the base portion 31. The sliding ring 6 is formed in an annular shape. The outer diameter of the sliding ring 6 is set equal to or less than the outer diameter of the end face of the bearing 41 facing the sliding ring 6. The sliding ring 6 is inserted through the shaft 32. The sliding ring 6 is a member that makes the rotation of the bearing 41 smooth. Specifically, the sliding ring 6 is formed of a single resin material having sliding property such as polyacetal or nylon, or a material obtained by adding a solid lubricant such as polytetrafluoroethylene or ultra-high molecular weight polyethylene to the resin. There is.

  The back yoke 42 includes a yoke main body 45 formed annularly, a fitting cylindrical portion 46 extending from the inner peripheral edge of the yoke main body 45, and an attaching portion 47 extending from the outer peripheral edge of the yoke main body 45, which are integrally formed It is done. The yoke body 45 is formed in an annular plate shape orthogonal to the axial direction Z, and is disposed coaxially with the central axis C of the shaft 32. The yoke main body 45 is disposed on the opposite side of the base portion 31 of the stator 3 with the bearing 41 interposed therebetween in the axial direction Z. The fitting cylindrical portion 46 extends from the inner peripheral edge of the yoke main body 45 toward the base portion 31 side of the stator 3 in the axial direction Z. The fitting cylinder 46 is formed in a cylindrical shape. The end of the bearing 41 in the axial direction Z is fitted in the fitting cylindrical portion 46. The mounting portion 47 extends outward in a radial direction R from a part of the outer peripheral edge of the yoke body 45. The attachment portion 47 is formed corresponding to the shape of the weight 44, and is formed in a fan shape having a central angle of about 180 ° (see FIG. 1).

  The magnet 43 is provided on the main surface of the yoke body 45 of the back yoke 42 facing the base portion 31 of the stator 3. The magnet 43 is disposed at the same position as the coil 33 of the stator 3 in the radial direction R.

  The weight 44 is provided on the main surface 47 a of the mounting portion 47 of the back yoke 42 facing the base portion 31 of the stator 3. The weight 44 is provided outside the magnet 43 in the radial direction R. The weight 44 is formed in a fan shape centered on the central axis C. The weight 44 is formed such that the central angle viewed in the axial direction Z is, for example, about 180 °. Thus, the weight 44 has a center of gravity at a position deviated from the central axis C. The dimension of the weight 44 in the axial direction Z substantially matches the dimension of the magnet 43 in the axial direction Z. As a material of the weight 44, tungsten which is a metal having a high specific gravity is used. The weight 44 is fixed to the mounting portion 47 by, for example, an adhesive or welding.

  In the vibration generator 2, when a current is supplied to the coil 33 of the stator 3, a magnetic force is generated in the coil 33. The magnet 43 of the rotor 4 attracts and repels the coil 33 by the interaction between the magnetic force generated in the coil 33 and the magnetic force of the magnet 43. Thereby, the rotor 4 rotates around the central axis C with respect to the stator 3. As a result, the centrifugal force of the weight 44 acts on the rotor 4 to generate vibration.

  The dial 16 is disposed on the opposite side to the coil 33 of the stator 3 across the rotor 4 in the axial direction Z. As shown in FIG. 1, the dial 16 is visible from the outside through the glass 15 and covers the movement (not shown) and the vibration generator 2. The dial 16 clearly indicates numbers and the like for displaying the time.

  As shown in FIGS. 1 and 2, an opening 18 is formed in the dial 16. The opening 18 exposes the rotor 4 in the direction opposite to the coil 33 of the stator 3 in the axial direction Z. The opening 18 is formed to surround the central axis C as viewed in the axial direction Z. The opening 18 is formed in a circular shape centered on the central axis C when viewed in the axial direction Z. The inner diameter of the opening 18 is smaller than twice the maximum radius of the rotor 4. In the illustrated example, the inner diameter of the opening 18 is larger than twice the radius of the yoke body 45 of the back yoke 42 and smaller than twice the radius of the mounting portion 47. Thus, an overlapping portion 19 overlapping the rotor 4 as viewed in the axial direction Z is formed at the opening edge 18 a of the opening 18. The overlapping portion 19 is provided so that at least a part thereof overlaps with the rotor 4 regardless of the rotational position of the rotor 4 when viewed in the axial direction Z (see FIG. 1). In the present embodiment, the overlapping portion 19 is formed in an annular shape. The overlapping portion 19 is separated from the rotor 4 in the axial direction Z.

  As described above, according to the present embodiment, the dial 16 is formed with the opening 18 that exposes the rotor 4 to the side opposite to the coil 33 in the axial direction Z. 4 becomes visible from the outside. Moreover, since the overlapping portion 19 overlapping the rotor 4 as viewed in the axial direction is formed at the opening edge 18 a of the opening 18, movement of the rotor 4 away from the coil 33 along the axial direction Z is restricted. it can. This can prevent the rotor 4 from falling off the shaft 32. Therefore, the timepiece 1 can make the user visually recognize the rotor 4 while preventing the rotor 4 of the vibration generator 2 from falling off.

  Moreover, the opening 18 is formed to surround the central axis C as viewed in the axial direction Z. Therefore, the rotor 4 can be visually recognized in a wider area as compared with the configuration in which the overlapping portion is formed at the position overlapping with the shaft 32 when viewed in the axial direction Z.

  Furthermore, since the vibration generator 2 is a brushless motor, a suction force is generated between the stator 3 and the rotor 4. For this reason, it is not necessary to always restrict movement of the rotor 4 in a direction away from the coil 33, and a member that always contacts the rotor 4 from the opposite side to the coil 33 in the axial direction Z to restrict the rotor 4 from falling off The shaft 32 need not be provided. Therefore, it is possible to reduce the number of parts as compared with a vibration generator such as a motor with a brush or the like in which a shaft always contacts the rotor and restricts the rotor from falling off.

  The overlapping portion 19 is separated from the rotor 4 in the axial direction Z. In the present embodiment, since the vibration generating device 2 is a brushless motor and a suction force is generated between the stator 3 and the rotor 4, the overlapping portion 19 is separated from the rotor 4 in the axial direction Z. The rotor 4 can be prevented from sliding on the overlapping portion 19 at the time of rotation. Therefore, the generation of the sliding noise at the time of rotation of the rotor 4 can be prevented. Moreover, the failure of the timepiece 1 due to the wear of the rotor 4 and the overlapping portion 19 can be prevented.

  And in this embodiment, since falling off of the rotor 4 can be prevented using the dial 16 of the timepiece 1, it is not necessary to newly provide a part for preventing falling off of the rotor 4 in the timepiece provided with the vibration generating device. . Therefore, an increase in the number of parts can be suppressed.

Second Embodiment
A vibration generator 102 according to a second embodiment of the present invention will be described.
FIG. 3 is a cross-sectional view showing the internal structure of the timepiece of the second embodiment.
As shown in FIG. 3, the vibration generator 102 includes a brushless motor 105 having a stator 3 and a rotor 4, and a case 106. The brushless motor 105 is formed in the same manner as the vibration generating device 2 of the first embodiment. The case 106 accommodates the rotor 4. The case 106 is formed by the base portion 31 of the stator 3 and the cover 120.

  The cover 120 is provided so as to cover the rotor 4 from the outer side in the radial direction R and the side opposite to the base portion 31 of the stator 3 in the axial direction Z. Specifically, the cover 120 has a box shape including a side wall 121 covering the rotor 4 from the outside in the radial direction R, and a ceiling wall 122 covering the rotor 4 from the opposite side to the base portion 31 of the stator 3 in the axial direction Z. Is formed.

  An opening 123 is formed in the top wall 122. The opening 123 exposes the rotor 4 in the direction opposite to the coil 33 of the stator 3 in the axial direction Z. The opening 123 is formed to surround the central axis C when viewed in the axial direction Z. The opening 123 is formed in a circular shape centered on the central axis C when viewed in the axial direction Z. The inner diameter of the opening 123 is smaller than twice the maximum radius of the rotor 4. In the illustrated example, the inner diameter of the opening 123 is larger than twice the radius of the yoke body 45 of the back yoke 42 and smaller than twice the radius of the mounting portion 47. As a result, at the opening edge 123a of the opening 123, an overlapping portion 124 overlapping with the rotor 4 as viewed in the axial direction Z is formed. The overlapping portion 124 is provided so that at least a part thereof overlaps with the rotor 4 regardless of the rotational position of the rotor 4 when viewed in the axial direction Z. In the present embodiment, the overlapping portion 124 is formed in an annular shape. The overlapping portion 124 is separated from the rotor 4 in the axial direction Z.

  As described above, according to the present embodiment, the top wall 122 of the cover 120 is formed with the opening 123 that exposes the rotor 4 to the side opposite to the coil 33 in the axial direction Z. The rotor 4 can be viewed from the outside through 123. Moreover, since the overlapping portion 124 overlapping with the rotor 4 as viewed from the axial direction is formed at the opening edge 123a of the opening 123, the movement of the rotor 4 away from the coil 33 along the axial direction Z is restricted. it can. This can prevent the rotor 4 from falling off the shaft 32. Therefore, the vibration generator 102 can make the user visually recognize the rotor 4 while preventing the rotor 4 from falling off.

  Moreover, the opening 123 is formed so as to surround the central axis C as viewed in the axial direction Z. Therefore, the rotor 4 can be visually recognized in a wider area as compared with the configuration in which the overlapping portion is formed at the position overlapping with the shaft 32 when viewed in the axial direction Z.

  Furthermore, since the vibration generator 102 is a brushless motor, a suction force is generated between the stator 3 and the rotor 4. For this reason, it is not necessary to always restrict movement of the rotor 4 in a direction away from the coil 33, and a member that always contacts the rotor 4 from the opposite side to the coil 33 in the axial direction Z to restrict the rotor 4 from falling off The shaft 32 need not be provided. Therefore, it is possible to reduce the number of parts as compared with a vibration generator such as a motor with a brush or the like in which a shaft always contacts the rotor and restricts the rotor from falling off.

  The overlapping portion 124 is separated from the rotor 4 in the axial direction Z. In the present embodiment, the stator 3 and the rotor 4 constitute a brushless motor 105, and a suction force is generated between the stator 3 and the rotor 4, so that the overlapping portion 124 is separated from the rotor 4 in the axial direction Z. Thus, the rotor 4 can be prevented from sliding on the overlapping portion 124 when the rotor 4 rotates. Therefore, the generation of the sliding noise at the time of rotation of the rotor 4 can be prevented. Further, the failure of the vibration generator 102 due to the wear of the rotor 4 and the overlapping portion 124 can be prevented.

  Further, in the present embodiment, by forming the opening 123 in the case 106 (cover 120) for housing the rotor 4, the rotor 4 can be made visible from the outside, and the case 106 is used to It can prevent falling off. Therefore, in the vibration generating apparatus 102 including the case 106 for housing the rotor 4, the user can make the user visually recognize the rotor 4, and the case 106 is not provided with a component for preventing the rotor 4 from falling off. It is possible to prevent the rotor 4 from falling off.

  The vibration generator 102 of the second embodiment may be mounted on the watch 1 instead of the vibration generator 2 of the first embodiment. Thereby, the same operation and effect as the timepiece 1 of the first embodiment can be exhibited.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope.
For example, in the above embodiment, the clock has been described as an example of the electronic device provided with the vibration generating device, but the electronic device is not limited to this, and the electronic device may be a device such as a smartphone or tablet PC having a notification function by vibration. Just do it.

  Moreover, in the said embodiment, although the whole opening edges 18a and 123a of the opening parts 18 and 123 are the overlapping parts 19 and 124 and the overlapping parts 19 and 124 are formed in annular | circular shape, it is not limited to this. The overlapping portion may be provided as long as it can prevent the rotor 4 from falling off the shaft 32 and may be provided so that at least a part thereof overlaps with the rotor 4 regardless of the rotational position of the rotor 4 when viewed from the axial direction Z. That is, for example, the overlapping portion may be formed in part in the circumferential direction.

  Further, the shapes of the back yoke and the weight of the rotor are not limited to the shapes of the above embodiment. The weight may be formed to shift the center of gravity of the rotor with respect to the central axis C. For example, the weight may be provided on the opposite side of the back yoke to the magnet.

  In addition, it is possible to replace components in the above-described embodiment with known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments may be combined as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Clock (electronic device) 2, 102 ... Vibration generator 3 ... Stator 4 ... Rotor 16 ... Dial plate (cover part) 18, 123 ... Opening 18a, 123a ... Opening edge 19, 124 ... Overlapping part 32 ... Shaft 33 ... coil 43 ... magnet 44 ... weight 105 ... brushless motor 106 ... case

Claims (6)

A brushless motor comprising: a stator including a coil and a shaft; a magnet externally fitted to the shaft and rotatably supported; a magnet attracting the coil; and a weight having a center of gravity at a position offset from a central axis of the shaft A vibration generator having a rotor with
A cover portion which is disposed on the opposite side to the coil across the rotor in the axial direction of the shaft, and an opening is formed to expose the rotor to the opposite side to the coil in the axial direction; ,
Equipped with
At least a part of the opening edge of the opening portion is formed with an overlapping portion overlapping the rotor when viewed from the axial direction.
An electronic device characterized by The overlapping portion is spaced apart from the rotor in the axial direction.
The electronic device according to claim 1, A clock,
The cover is a dial;
The electronic device according to claim 1 or 2, characterized in that: Brushless having a stator comprising a coil and a shaft, and a rotor having a magnet which is externally supported and rotatably supported on the shaft and which attracts the coil and which has a center of gravity at a position offset from the central axis of the shaft. Motor,
A cover portion which is disposed on the opposite side to the coil across the rotor in the axial direction of the shaft, and an opening is formed to expose the rotor to the opposite side to the coil in the axial direction; ,
Equipped with
At least a part of the opening edge of the opening portion is formed with an overlapping portion overlapping the rotor when viewed from the axial direction.
A vibration generator characterized by The overlapping portion is spaced apart from the rotor in the axial direction.
The vibration generating device according to claim 4, characterized in that: A case for housing the rotor;
The cover is part of the case,
The vibration generator according to claim 4 or 5 characterized by things.

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