JP2007006672A - Electronic apparatus equipped with vibration means and cooling means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus in which both the generation of vibrations and the drive of a cooling fan are performed by a motor, that eliminates user's inconvenience on usage by the vibrations generated, when the cooling fan is driven, and that suppresses power consumption. <P>SOLUTION: This electronic apparatus 100, which incorporates a motor 401, and a vibration unit 403 and the cooling fan 404 each driven with respect to the rotation of the motor 401, is configured to have a vibration mode, in which, when the electronic apparatus 100 is driven, the vibrations are generated by driving the vibration unit 403 or the cooling fan 404 in addition to this, and a cooling mode, where the cooling fan 404 is driven, while making the generation of the vibrations smaller than in the vibration mode. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic device including a vibration unit and a cooling unit, and more particularly to a mutual relationship between the vibration unit and the cooling unit.

  In recent electronic devices, particularly portable electronic devices represented by mobile phones, progress toward higher functionality has been remarkable. For example, mobile phones can transmit and receive text and images, and can connect to the Internet, in addition to the function of notifying incoming calls by generating vibration by driving a vibrating body with a motor when an incoming call is provided from the beginning. It has a wide variety of functions. Further, the so-called “short, small and thin” is required for the cellular phone while promoting the above-mentioned enhancement of functionality, and it is fully considered that these demands will become stronger.

For this reason, problems such as an increase in the amount of heat generated by the internal electronic elements due to the above-described enhancement and an increase in the amount of heat stored inside the device due to the downsizing and thinning become serious.
On the other hand, from the viewpoint of emphasizing space saving and weight reduction, no countermeasures have been actively taken for the above problem at present, but it is considered to install a cooling fan in the portable electronic device. It has been. However, if a driving motor for the cooling fan is newly provided, there is a possibility that it becomes an obstacle to miniaturization and thinning of the portable electronic device and a new heat source. Therefore, a technique has been proposed in which a cooling fan and a vibration motor are integrally driven using a vibration motor, and cooling is performed without providing a new motor (for example, Patent Document 1). .
JP 2004-72420 A

  However, in the configuration in which one motor is used for both vibration and cooling as in Patent Document 1, vibration is inevitably generated when the motor is driven when the cooling fan is driven. In the future, personal personal digital assistants (PDAs) will be used in a form similar to a personal computer (PC) (PC use) when the user performs more various inputs or operations using a stylus or finger keyboard. When such a usage pattern is taken into consideration, if the vibration occurs every time the cooling fan is driven, it is difficult for the user to endure the trouble at the time of the input, and it is also possible to perform a reliable input. It will cause trouble.

In addition, as described above, if vibration always occurs when the cooling fan is driven, it may be difficult for the user to determine whether the vibration is caused by an incoming call.
In addition, generating unnecessary vibration as described above is not desirable from the viewpoint of reducing current consumption because power is wasted.
The present invention has been made in view of the above problems, and both generation of vibration and driving of a cooling fan are performed by a single motor, and inconvenience in use by a user due to vibration generated when the cooling fan is driven is eliminated. An object is to provide an electronic device in which power consumption is also suppressed.

In order to solve the above problems, the configuration of the electronic apparatus according to the present invention is as follows.
An electronic device including a motor and a vibrating body and a cooling fan that are driven to rotate with respect to the rotation of the motor, respectively, and when the electronic device is driven, the cooling body or the cooling fan is driven to rotate in addition to the vibrating body. And a cooling mode in which the cooling fan is driven to rotate while generating less vibration than the vibration mode.

In particular, the vibrating body is disposed via a first one-way clutch with respect to a motor shaft or a shaft that is driven to rotate, and in a direction in which the driven rotation of the vibrating body is turned on in the vibration mode. The rotation direction of the motor is restricted, and in the cooling mode, the rotation direction of the motor is restricted so that the driven rotation of the vibrating body is turned off.
Further, the vibrating body is disposed via a first one-way clutch with respect to a motor shaft or a shaft that is driven to rotate, and the first one-way is provided between the cooling fan and the motor shaft. A second one-way clutch that is engaged in the rotational direction where the clutch is disengaged may be interposed.

Further, in the vibration mode, the balance member is separated from the vibrating body, and in the cooling mode, the balance member is attached to the vibrating body, and the balance member and the vibrating body are combined. The electronic device may be characterized in that the rotational center of gravity is substantially coincident with the axis of the motor shaft.
The two modes may be switched by attaching / detaching the vibrator to / from the motor shaft or a shaft that is driven to rotate.

As another configuration, the vibrating body includes a deformable material, and in the cooling mode, the vibrating body holds the material in a shape in which a rotational center of gravity coincides with a motor shaft or a shaft driven and rotated by the material, and the vibration In the mode, there may be provided a shape holding mechanism for holding the material with a shape whose rotational center of gravity is eccentric from the motor shaft or a shaft driven to rotate.
In this case, the material is a magnetic fluid, and the shape holding mechanism has a container that is attached to the motor shaft and stores the magnetic fluid, and in the cooling mode, attracts the magnetic fluid to one side in the container. Thus, the rotational center of gravity maintains a shape that coincides with the motor shaft, and in the vibration mode, the rotational center of gravity maintains a shape that deviates from the motor shaft by being attracted to the other.

In addition to the above-described configuration, a heat sensing device that senses heat in the inner space is provided, and a control device that controls the driving of the motor based on a signal from the heat sensing device may be provided. Absent.
Furthermore, the number of rotations of the motor is smaller in the cooling mode than in the vibration mode.

  The heat dissipation method in the electronic apparatus having the above configuration is performed by the driven rotation of the cooling fan among the motor, the vibrating body that is driven to rotate with respect to the rotation of the motor, and the cooling fan. There is a vibration mode in which at least the vibrating body of the cooling fan is driven to rotate to generate vibration, and a cooling mode in which the cooling fan is driven to rotate while reducing vibration below the vibration mode, and switched to the cooling mode. The cooling fan is driven to rotate.

In particular, in the cooling mode, the rotational center of gravity of the vibrating body is matched with the motor shaft.
In the cooling mode, the rotational speed of the motor is made smaller than that in the vibration mode.
In addition, the motor is controlled based on a signal from a heat sensing device that senses heat of an electronic element disposed inward.

  Further, the drive control is performed by a waveform conversion process for converting a signal waveform from the heat sensing device and a motor drive process for driving the motor based on a signal from the waveform conversion process.

  In the present invention, the electronic device equipped with the vibrating body and the cooling fan that are driven to rotate with respect to the rotation of the motor has the above two modes, and the driving force from the same motor is obtained in both modes. Since it is used, it does not hinder downsizing and thinning of the electronic device, and it does not provide a further heat source. Furthermore, in the cooling mode, cooling can be performed while maintaining a state in which vibration is reduced as compared with that in the vibration mode, so that the input operation is hindered when the user is concerned about the conventional device. There is no annoyance.

  Further, the user is not mistaken for an incoming call when the cooling fan is operating. Furthermore, even if the motor is shared, it is effective because power consumption can be reduced by adjusting the driving force for each mode.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that although a mobile phone is described here as an example of an electronic device, it should be noted that the present invention is not limited to this and can be applied to other electronic devices such as a PDA and a thin and small notebook PC. .
(Embodiment 1)
(1) Overall Configuration The configuration of the mobile phone 100 according to the present embodiment will be described with reference to FIG.

The mobile phone 100 is configured such that the upper body 110 and the lower body 120 can be folded via the hinge 12. Among these, an antenna 61 is provided on one end side of the upper body 110 so as to be extendable and contractible. On the other hand, the lower body 120 is formed by combining a front case 11a and a back case 11b, and a switching unit 51 for switching the usage mode of the mobile phone 100 is provided on a side surface. Inside the lower body 120 are a radio circuit (not shown), a CPU (Central Processing Unit) 32, an HDD (Hard Disk Drive) (not shown), a heat sensor 34 that senses heat and temperature, a memory 33, and the like. As the cooling means for the printed circuit board 31 and the electronic element, a vibration cooling unit 40 that also uses a vibration motor as a drive source is disposed. Although not shown, the upper body 110 is provided with a receiver, a display unit, and the like, and the lower body 120 is provided with a transmitter, a key operation unit, and the like. Hereinafter, the vibration cooling unit 40 will be described.
(1-1) Vibration cooling unit 40
(1-1-1) Configuration of Vibration Cooling Unit 40 As shown in FIG. 2 (a), the vibration cooling unit 40 includes a motor 401, a vibrating body 403, a cooling fan 404, and a vibrating body clutch mechanism section (hereinafter referred to as a vibration mechanism). , 405 and a cooling fan clutch mechanism (hereinafter referred to as “cooling clutch”) 406 as main components.

The motor 401 is arranged on the printed circuit board 31, and the driven shaft 402 is connected directly or via a speed change mechanism (not shown). As the motor 401, a commercially available motor can be used. For example, a motor having a performance with a nominal maximum rotational speed of about 10,000 rpm can be used.
The vibrating body 403 has a different-diameter cylindrical shape whose center of gravity is offset with respect to the axis of the motor 401, and is arranged in a state of covering the driven shaft 402. However, the vibrating body 403 is rotatably provided to the driven shaft 402 via bearings 407 and 408 and a vibration clutch 405 as shown in FIG.

  The vibration clutch 405 is provided between the vibrating body 403 and the driven shaft 402, and the cooling clutch 406 is provided between the cooling fan 404 and the driven shaft 402. The vibration clutch 405 and the cooling clutch 406 are set so as to be engaged with the driven shaft 402 in different rotational directions. Both clutches 405 and 406 may use a known one-way clutch, and detailed description thereof is omitted.

As shown in FIG. 2B, the cooling fan 404 is fixed to a support shaft 410 composed of a shaft body 410a and a substantially dish-shaped body 410b, and the support shaft 410 is connected to a driven shaft 402 via a cooling clutch 406. It is connected to.
As a result, only when the motor 401 is driven in the direction in which the vibration clutch 405 is engaged (A direction), the rotational driving force is transmitted to the vibrating body 403 via the vibration clutch 405.
Further, only when the motor 401 rotates in the direction in which the cooling clutch 406 is engaged (B direction), the rotational driving force is transmitted to the cooling fan 404 via the cooling clutch 406. As shown in FIG. 2B, the support shaft 410 is rotatably supported by a bearing 409, and its axis coincides with the axis of the driven shaft 402.
(1-1-2) Control of Vibration Cooling Unit 40 When the mobile phone 100 incorporating the vibration cooling unit 40 having the above-described configuration is used as a telephone (hereinafter referred to as “at the time of a telephone function”), vibration cooling is performed. The unit 40 is used as a vibration generation source for notifying the user of an incoming call by vibration.

  During the telephone function, as shown in FIG. 3, the receiver 62, transmitter 63, and the like can be used via the radio circuit 600. At this time, the rotation direction of the motor 401 is set to one direction (A direction). When the user has previously selected the incoming call notification means by vibration, the vibrating body 403 rotates according to the rotation of the motor 401 at the time of the incoming call. . When the sounding means is selected, the speaker 64 is activated when an incoming call is received.

On the other hand, when the user can use the mobile phone 100 as a PC via the switching unit 51 (hereinafter referred to as “PC function”), the vibration cooling unit 40 has a cooling function of the internal mounting element. Fulfill. At this time, the rotation direction of the motor 401 is set in the opposite direction (B direction) to that during the telephone function.
At the time of the PC function, as shown in FIG. 3, the thermal sensor 34 always detects the heat generation amount and temperature of the CPU 32, HDD 35, etc., and outputs it to the application control circuit 300 that controls the control of these electronic elements, When the amount of heat exceeds a preset threshold value, the control circuit 700 drives the motor 401 based on the signal and rotates the cooling fan 404 in a driven manner.

Although not shown in the figure, the signal is transmitted through the signal converter (for example, RC filter) and the power supply ASIC until the signal from the thermal sensor 34 reaches the control circuit 700. The output signal of the thermal sensor has an irregular amplitude value and periodic waveform, and is converted into a so-called DC signal whose amplitude value is substantially constant and stable by the signal conversion device. Input to the power supply ASIC built into the circuit 300. A predetermined amplitude value is set for the power supply ASIC, and the magnitude relationship between the amplitude value of the input signal (DC signal) and this set value is determined. If the set value is exceeded, cooling is required. A signal for driving the motor is output to the control circuit 700.
(1-1-3) Superiority of the cellular phone 100 In the cellular phone 100, the vibrating body 403 and the cooling fan 404 are connected to the driven shaft 402 via a one-way clutch in which the rotation direction is regulated. According to the user's selection, only the vibrating body 403 can be driven and rotated during the telephone function, and only the cooling fan 404 can be driven and rotated during the PC function. Therefore, in the mobile phone 100, the driving of the vibrating body 403 and the cooling fan 404 is switched according to the user's selection. In particular, at the time of the PC function, even if the user is performing an input operation or the like, the vibrating body 403 is not driven, so that no vibration is generated and the input operation or the like is not hindered. For this reason, a user does not memorize troublesomeness.

In addition, the vibrating body 403 and the cooling fan 404 are independently driven as appropriate, but the driving source is also used as a vibration motor that has been conventionally used, so that the design and volume of the mobile phone 100 are large. This also leads to the realization of the mobile phone 100 that is further enriched in both miniaturization, thinning and high performance without causing any trouble.
Further, in the mobile phone 100, the vibration body 403 and the cooling fan 404 can be distinguished and driven for each of the telephone function and the PC function. Therefore, the number of rotations of the motor 401 and the cooling fan 404 when driving the vibration body 403 are driven. A difference can be provided in the rotational speed of the motor 401 at the time. Thereby, power consumption in the mobile phone 100 can be reduced. For example, in general, the rotational speed required for vibration generation in a mobile phone is 900 to 10,000 rpm, but the rotational speed required for cooling is about 3000 to 4000 rpm for a cooling fan in a notebook computer. Therefore, it is considered that the same number of rotations is sufficient considering the internal volume of the mobile phone.
(Modification)
Next, a mobile phone according to a modification will be described. Note that the difference between the mobile phone according to the present modification and the mobile phone 100 according to the first embodiment is only the configuration of the vibration cooling unit 41, which will be described below.

As shown in FIG. 4, in the vibration cooling unit 41, the cooling fan 414 is fixed to the driven shaft 412, and further includes only one clutch mechanism unit, and the clutch mechanism unit controls the rotation of the vibrating body 413. Yes.
Similar to the vibrating body 403 of the first embodiment, the vibrating body 413 has a cylindrical shape on the outer periphery, and the inner periphery has the same diameter, but the center of each of the half-periphery and the remaining half-periphery is radial. And is arranged at a substantially central portion in a state in which the driven shaft 412 is covered. However, as shown in FIG. 5A, the vibrating body 413 has a bearing portion 416 joined to an end surface thereof, and is provided to be rotatable with respect to the driven shaft 412 via the bearing portion 416.

  In the vibration cooling unit 41 according to the present modification, a clutch mechanism is configured in which a Z-shaped pulley 415 that can be expanded and contracted in the radial direction is fixed to the driven shaft 412 and disposed at a position that is accommodated in the vibrating body 413. This is a major feature of the present modification. This clutch mechanism portion is a so-called centrifugal clutch mechanism, and when the driven shaft 412 rotates in the direction of B1, as shown in FIG.5 (b), the tip 415a of the pulley 415 is in the vibrating body 413. The clutch-off state is maintained without meshing with the circumferential recess 413a. Therefore, in this state, the rotational driving force of the motor 411 is not conducted from the pulley 415 to the vibrating body 413, so that the vibrating body 413 does not rotate and only the cooling fan 414 rotates. On the other hand, when the driven shaft 412 rotates in the direction of B2, the pulley 415 is deformed so as to expand in the radial direction of rotation as shown in FIG.5 (c), and the tip 415a meshes with the recess 413a on the inner periphery of the vibrating body 413. Thus, the clutch mechanism portion is clutched on. Therefore, the rotational driving force of the motor 411 is transmitted to the vibrating body 413 via the pulley 415, and the vibrating body 413 also rotates.

The pulley 415 is made of an elastic member, for example, a member made of a resin such as nylon, polyethylene, or polystyrene, or a synthetic rubber such as an elastomer.
As described above, even in this modification, the user is not bothered by vibration during the PC function. Moreover, at the time of a telephone function, not only vibration but also cooling can be performed at the same time, and an effect of suppressing temperature rise can be provided. Furthermore, since only one clutch mechanism is disposed, it is advantageous in terms of cost and space saving.
(Embodiment 2)
Next, a mobile phone according to Embodiment 2 will be described. In the present embodiment, the description will be made focusing on the vibration cooling unit 42 which is a difference between the first embodiment and the modification.
(2-1) Configuration of Vibration Cooling Unit 42 As shown in FIG. 6A, the vibration cooling unit 42 includes a balance member 425a, a cylindrical member 425b, in addition to the motor 421, the vibrating body 423, and the cooling fan 424. A bearing unit 426 and a switching unit 427 are included.

The vibrating body 423 according to the present embodiment is a columnar body extending in the direction of the driven shaft 422, and the vertical cross section with respect to the driven shaft 422 is formed by cutting out a part of a circle centered on the driven shaft 422. Unlike Embodiment 1 and the modification, the vibrating body 423 is fixed to the tip of the driven shaft 422. As a result, when the motor 421 is driven, the vibrating body 423 always rotates following the driven shaft 422.
Further, between the vibrating body 423 and the motor 421, the cylindrical member 425b and the bearing portion 426 are disposed on the driven shaft 422 in a state where they are joined. A balance member 425a is fixed to the cylindrical member 425b, and a switching portion 427 is fixed to the bearing portion 426.

  The cylindrical member 425b is disposed on the driven shaft 422 via the connecting member 428. As shown in the schematic cross-sectional view of the imaginary plane C shown in FIG.6 (b), the connecting member 428 includes a cylindrical member 4282 in which a spherical body 4281 is disposed and a cylindrical member 4283 that covers the spherical member 4281 as a unit. This is a so-called “stroke bush structure” or “slide rotary bush structure”. Thereby, even if the driven shaft 422 rotates, the spherical body 4281 suppresses the frictional force and does not conduct the rotational force to the outer cylindrical member 4283. Therefore, the connecting member 428 enables the cylindrical member 425b to be rotatable and slidable with respect to the driven shaft 422.

  Since the balance member 425a is fixed to the cylindrical member 425b, the balance member 425a is configured to be slidable in the direction of the driven shaft 422 along with the sliding. As described above, the balance member 425a has substantially the same size as the cut-out portion of the circular cross section of the vibrating body 423. Therefore, the balance member 425a is combined by being slid to the position of the vibrating body 423. This is a cylindrical body having the driven shaft 422 as a central axis.

The cooling fan 424 includes two blade portions 424a attached to the vibrating body 423 and one blade portion 424b attached to the balance member 425a. The single blade portion 424b is also combined with the two blade portions 424a as the balance member 425a slides.
The bearing member 426 is a thrust bearing, whereby the rotational force of the cylindrical member 425b is not transmitted to the switching unit 427.
(2-2) Driving the Vibration Cooling Unit 42 During the telephone function, the balance member 425a is not combined with the vibrating body 423 as shown in FIG. When the motor rotates in this state, the vibrating body 423 is driven to rotate with respect to the driven shaft 422, and the center of rotation of the vibrating body 423 is deviated from the axis of the driven shaft 422. At the same time, the two blade portions 424a are also driven and rotated, and the center of rotation of the blades 424a deviates from the axis of the driven shaft 422.

Accordingly, the rotational motion of the vibrating body 423 and the blade portion 424a is an eccentric motion, so that vibration is generated. At this time, the rotational driving force of the driven shaft 422 is not transmitted to the cylindrical member 425b and the balance member 425a by the connecting member 428.
On the other hand, when the PC function is switched via the switching unit 427, the tip of the cylindrical member 425b is inserted into the recessed portion of the vibrating body 423 as shown in FIG. To be combined. When the motor rotates in the direction of the arrow in this state, the vibrating body 423 is also driven to rotate, and the balance member 425a also rotates in the direction of the arrow in response to the rotational force. The cooling fan 424 is also driven and rotated in a state where the three blades are combined.

  Therefore, the cooling fan 424 can rotate to cool the inside of the mobile phone, and the combination of the vibrating body 423 and the balance member 425a is in a state where the center axis thereof coincides with the axis of the driven shaft 422. Therefore, even if the vibrating body 423 rotates, the vibration is canceled out. In this way, during the PC function, the motor 421 is driven to perform cooling while largely suppressing the generation of vibration, and during the telephone function, vibration can be reliably generated.

  In addition to the above-described configuration, a magnetic pole body is disposed above the vibrating body 423 and the cylindrical member 425b (in the Z direction), and the magnetic pole body is also disposed in the region of the back case where they face each other. The magnetic pole bodies may attract each other. Thereby, when the motor 421 is not driven, the vibrating body 423 and the cylindrical member 425b are allowed to stand in a predetermined state. Therefore, when the cylindrical member 425b is slid, the vibrating body 423 and the balance member 425a are easily combined. be able to. In addition, if a fitting portion is provided in each of the hollow portion of the cylindrical member 425b and the vibrating body 423 or the contact portion between the balance member 425a and the vibrating body 423, the rotational force is generated when the vibration member is combined. It conducts well to both 423 and balance member 425a.

Furthermore, in the present embodiment, the vibrating body 423 and the balance member 425a are combined in response to switching between the telephone function and the PC function. However, the present invention is limited to the above configuration as long as it has the characteristics of the present invention. Other configurations are also applicable. For example, a balanced vibrating body is connected to the driven shaft, and a part of the vibrating body is configured to be detachable, with the PC function being in a balanced state and the telephone function being partially off the driven shaft. It does not matter even if it is out of balance.
(Embodiment 3)
Next, the cellular phone according to the third embodiment will be described focusing on the vibration cooling unit 43 that is different from the first and second embodiments.
(3-1) Configuration of Vibration Cooling Unit 43 As shown in FIG. 8A, the vibration cooling unit 43 includes two magnetic pole bodies 435 in which a motor 431, a vibrating body 433, a cooling fan 434, and a switching unit 437 are joined. , 436 as main components.

The magnetic pole bodies 435 and 436 are both thin disk members, one of which is disposed between the motor 431 and the vibrating body 433 and the other is disposed between the vibrating body 433 and the cooling fan 434. However, these magnetic pole bodies 435 and 436 have the same polarity on the opposite end surfaces, are not fixed to the driven shaft 432, and follow the slide of the switching portion 437 to follow the driven shaft direction (Y direction). It is possible to slide.
The vibrating body 433 has a substantially bottomed cylindrical shape, and the bottom surface is fixed to the driven shaft 432. On the other hand, the other end face is fixed to the base end of the support shaft of the cooling fan 434. As shown in FIG. 8B, the internal structure is a flat surface (hereinafter referred to as “front surface”) perpendicular to the driven shaft direction on the cooling fan 434 side of both end surfaces on the inner surface. The motor 431 side is a flat surface (hereinafter referred to as “rear surface”) 433c inclined by a predetermined angle with respect to the driven shaft. In addition, a wall portion 433b that is thickly processed so as to protrude inward is provided at a substantially central portion in the longitudinal direction.

Although not shown in the drawing for the sake of convenience, a deformable magnetic fluid (for example, a magnetic fluid using water, hydrocarbon oil, and fluorine oil as a medium) and an insulating fluid are present inside the vibrating body 433. Being injected.
The present embodiment is characterized in that the rotational balance of the vibrating body 433 is adjusted when the motor 431 is driven by moving the magnetic pole bodies 435 and 436 with respect to the vibrating body 433 having the above-described configuration.
(3-2) Driving the Vibration Cooling Unit 43 During the telephone function, as shown in FIG. 9A, a magnetic pole body (hereinafter referred to as “first magnetic pole body”) disposed between the cooling fan 434 and the vibrating body 433. 435 is located farthest from the vibrating body 433, and a magnetic pole body (hereinafter referred to as “second magnetic pole body”) 436 disposed between the vibrating body 433 and the motor 431 is closest. The magnetic fluid 438 is attracted by the second magnetic pole body 436 and distributed on the rear surface side. From this state, switching is performed during the PC function via the switching unit 437, and as shown in FIG. 9 (b), the first magnetic pole body 435 is placed closest to the vibrating body 433, as opposed to during the telephone function, and the second magnetic pole When the body 436 is farthest away, the attractive force of the first magnetic pole body 435 is larger than that of the second magnetic pole body 436, and the magnetic fluid 438 moves to the front surface side and is uniformly distributed.

In this state, the motor 431 is driven to rotate the vibrating body 433, and the cooling fan 434 is also driven to rotate for cooling. At this time, due to the rotational centrifugal force of the vibrating body 433, the magnetic fluid 438 moves to the peripheral end portion and is uniformly distributed as shown in FIG.9 (c), so the rotational center of gravity of the vibrating body 433 coincides with the driven shaft 432. Therefore, it does not become an eccentric motion and vibration does not occur.
Next, switching to the state of the telephone function, as shown in FIG. 9 (d), when the first magnetic pole body 435 is again separated from the vibrating body 433 and the second magnetic pole body 436 is brought close to the vibrating body 433, The attraction force of the two magnetic pole bodies 436 becomes stronger, and the magnetic fluid 438 moves to the rear surface side. In this state, when the motor 431 is driven and the vibrating body 433 is driven to rotate, the magnetic fluid 438 moves to the peripheral end as shown in FIG. At this time, since the rear surface is inclined, the distribution of the magnetic fluid 438 is biased. In particular, the wall portion 433b limits the spread of the magnetic fluid in the longitudinal direction (Y direction), and the bias becomes significant. As a result, the rotational center of gravity of the vibrating body 433 deviates from the driven shaft 432, and the rotation of the vibrating body 433 becomes an eccentric motion and generates vibration.

As described above, it is possible to switch between a state in which cooling can be performed while suppressing generation of vibration and a state in which vibration is reliably generated.
(Other matters)
The present invention is not limited to the above-described configuration, and other configurations may be used as long as the driving force of the motor can be appropriately used for vibration and cooling in accordance with the use of the electronic device. Also, other components can be applied as long as they can vibrate and cool. For example, although the cooling fan has a shape having three blades, the number of blades may be used, and a fanless structure having no blades may be used. Further, the vibration cooling unit and the switching unit may be disposed at other positions as long as they correspond to the specifications of the electronic device.

  A structure having a cooling function as in the present invention is useful not only for small portable electronic devices but also for other electronic devices because cooling can be performed while reducing current consumption.

1 is a schematic perspective view of a mobile phone according to Embodiment 1. FIG. 2 is a schematic perspective view and a schematic cross-sectional view of a vibration cooling unit according to Embodiment 1. FIG. 1 is a block diagram of a mobile phone according to Embodiment 1. FIG. It is a schematic perspective view of the vibration cooling part which concerns on a modification. It is a schematic cross section of the vibration cooling part which concerns on a modification. 5 is a schematic perspective view of a vibration cooling unit according to Embodiment 2. FIG. 5 is a partial perspective view of a vibration cooling unit according to Embodiment 2. FIG. 5 is a schematic perspective view of a vibration cooling unit according to Embodiment 3. FIG. FIG. 6 is a drive process sectional view of the vibration cooling unit according to the third embodiment.

Explanation of symbols

40, 41, 42, 43 Vibration cooling unit
51, 427, 437 switching section
100 mobile phone
401, 411, 421, 431 Motor
402, 412a, 422, 432 Driven shaft
403, 413, 423, 433 Vibrating body
405, 406 Clutch mechanism
414, 424, 434 Cooling fan
430a, 430b Magnetic pole body
436 Magnetic fluid
437 Insulating fluid

Claims (14)

An electronic device including a motor and a vibrating body and a cooling fan that are driven to rotate with respect to the rotation of the motor,
When driving the electronic device,
A vibration mode for generating vibration by following rotation of the cooling fan or the cooling fan in addition to the vibration body;
An electronic device, comprising: a cooling mode in which the cooling fan is driven to rotate while generating less vibration than the vibration mode. The vibrating body is disposed via a first one-way clutch with respect to a motor shaft or a shaft that rotates following the motor shaft.
In the vibration mode, the rotation direction of the motor is regulated in a direction in which the driven rotation of the vibrating body is in an on state,
2. The electronic device according to claim 1, wherein the rotation direction of the motor is restricted so that the driven rotation of the vibrating body is turned off in the cooling mode. The vibrating body is disposed via a first one-way clutch with respect to a motor shaft or a shaft that rotates following the motor shaft.
3. The second one-way clutch that is engaged in a rotational direction in which the first one-way clutch is disengaged is interposed between the cooling fan and the motor shaft. The electronic device described. In the vibration mode, the balance member is separated from the vibrating body,
2. The cooling mode, wherein the balance member is attached to the vibrating body, and a rotational center of gravity of the balance member and the vibrating body is substantially aligned with an axis of a motor shaft. The electronic device as described in. 2. The electronic device according to claim 1, wherein the two modes are switched by attaching or detaching the vibrating body to or from the motor shaft or a shaft that is driven to rotate. The vibrator includes a deformable material,
In the cooling mode, the material is held in a shape whose rotational center of gravity coincides with a motor shaft or a shaft that is driven and rotated by the same.
2. The electronic device according to claim 1, further comprising: a shape holding mechanism that holds the material in a shape in which a center of rotation of the material is eccentric from the motor shaft or a shaft that is driven and rotated in the vibration mode. The material is a magnetic fluid;
The shape holding mechanism has a container that is attached to the motor shaft and stores the magnetic fluid,
In the cooling mode, by attracting the magnetic fluid to one side in the container, the rotational center of gravity maintains a shape that matches the motor shaft,
7. The electronic apparatus according to claim 6, wherein in the vibration mode, the rotational center of gravity maintains a shape deviating from the motor shaft by being attracted to the other. There is a heat sensing device that senses heat in the interior space,
8. The electronic apparatus according to claim 1, further comprising a control device that controls driving of the motor based on a signal from the heat sensing device. 9. The electronic apparatus according to claim 1, wherein the rotation speed of the motor is smaller in the cooling mode than in the vibration mode. A heat dissipation method for an electronic device performed by a driven rotation of the cooling fan among a motor and a vibrating body and a cooling fan that rotate following the rotation of the motor,
A vibration mode in which at least the vibration body is driven to rotate to generate vibration among the vibration body and the cooling fan; and a cooling mode in which the cooling fan is driven to rotate while reducing vibrations than the vibration mode.
Switching to the cooling mode and rotating the cooling fan in a driven manner. 11. The heat dissipation method for an electronic device according to claim 10, wherein in the cooling mode, the rotational center of gravity of the vibrating body and a motor shaft are matched. 12. The heat dissipation method for an electronic device according to claim 10, wherein the number of rotations of the motor is smaller in the cooling mode than in the vibration mode. 13. The electronic device according to claim 10, wherein drive control of the motor is performed based on a signal from a heat sensing device that senses heat of an electronic element disposed inward. Heat dissipation method. 14. The drive control is performed by a waveform conversion process for converting a signal waveform from the heat sensing device, and a motor drive process for driving the motor based on a signal from the waveform conversion process. The heat dissipation method of the electronic device as described.

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