JP2006242745A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device equipped with a piezoelectric actuator capable of improving shock resistance, while avoiding increase of the number of components. <P>SOLUTION: In a watch 1 equipped with a device body 1a equipped with the piezoelectric actuator 71 and a rotor 72 driven by the piezoelectric actuator 71, and with a wrist band 1b connected to the device body 1a, the rotor 72 is energized and brought into contact with the piezoelectric actuator 71 by a pressing spring 435, and the rocking direction of the rotor 72 is adjusted being along an extending direction β of the wrist band 1b in the contact state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic apparatus including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body.

2. Description of the Related Art Conventionally, there is known an electronic timepiece including a timepiece body including a piezoelectric actuator, a rotor (driven body) that is rotationally driven by the piezoelectric actuator, and a wristband coupled to the timepiece body (for example, Patent Literature 1). This type of electronic timepiece is configured to rotate a tooth wheel train by rotation of a rotor, and to rotate an hour hand and a minute hand attached to a gear shaft in the tooth wheel train.
JP 2004-354365 A

However, in the conventional configuration, when this type of electronic device is dropped on the floor or the like, the drop impact force may cause the rotor to slip or damage the piezoelectric actuator or the like. . On the other hand, if a buffer member is arranged in order to eliminate such inconvenience, the number of parts increases accordingly, leading to an increase in the size of the electronic device.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an electronic apparatus including a piezoelectric actuator capable of improving impact resistance while avoiding an increase in the number of components. .

  In order to solve the above-described problems, the present invention provides an electronic apparatus including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body. Alternatively, one of the driven bodies is urged and brought into contact with the other member, and in this contact state, the swinging direction of the one member is aligned with the extending direction of the wristband. According to this configuration, when one of the piezoelectric actuator or the driven body is biased to contact the other, the swinging direction of the one member is a direction along the direction in which the wristband extends. The external impact force from the swinging direction can be absorbed by the wristband, and the impact force acting in the direction of pressing the piezoelectric actuator and the driven body can be reduced, whereby the piezoelectric actuator and the driven body can be reduced. Damage due to collisions and fluctuations in the feed amount of the driven body are avoided.

According to another aspect of the present invention, there is provided an electronic apparatus including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body. The actuator is biased to contact, and in this contact state, the swinging direction of the driven body is set along the direction in which the wristband extends. According to this configuration, when the driven body is urged to contact with the piezoelectric actuator, the swinging direction of the driven body is a direction along the direction in which the wristband extends. The external impact force can be absorbed by the wristband, and the impact force acting in the direction in which the piezoelectric actuator and the driven body are pressed can be reduced, thereby causing damage due to the collision between the piezoelectric actuator and the driven body. And fluctuations in the feed amount of the driven body are avoided.
In the above configuration, the driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, the angle between the swinging direction of the driven body and the extending direction of the wristband is within 45 degrees. It is preferable to do.
Further, in the above configuration, the piezoelectric actuator includes a base portion and a vibration portion coupled to the base portion via a neck portion, and a direction in which the vibration portion swings with respect to the neck portion is defined as the list. It may be along the direction in which the band extends. According to this configuration, since the direction in which the vibrating portion swings with respect to the neck portion is the direction in which the wristband extends, the forced swinging of the vibrating portion due to an external impact force can be suppressed. Damage to the piezoelectric actuator is avoided. Further, in the above configuration, the driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, an angle between the swinging direction of the vibrating portion and the extending direction of the wristband is within 45 degrees. It is preferable to make it.

Further, the present invention provides an electronic device including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body, wherein the piezoelectric actuator includes a base, And a vibration part connected to the base part via a neck part, and a direction in which the vibration part swings is aligned with a direction in which the wristband extends. According to this configuration, since the direction in which the vibration unit swings is the direction in which the wristband extends, the forced swing of the vibration unit due to an external impact force can be suppressed, and the piezoelectric actuator can be damaged by the forced swing. Avoided.
Further, in the above configuration, the driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, an angle between the swinging direction of the vibrating portion and the extending direction of the wristband is within 45 degrees. It is preferable to make it.
Further, in the above configuration, the driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, an angle between the swinging direction of the vibrating portion and the extending direction of the wristband is within 45 degrees. It is preferable to make it. In the above configuration, a rotating body that is rotationally driven by the piezoelectric actuator or a slider that is driven in a linear direction by the actuator may be used as the driven body. In the above configuration, the electronic device may be configured as a timepiece having a time display unit for displaying time.

  In the present invention, one of the piezoelectric actuator or the driven body is urged and brought into contact with the other member, and in this contact state, the swinging direction of one member is aligned with the direction in which the wristband extends. The external impact force from the swinging direction of one member can be absorbed by the wristband, and damage due to collision between the piezoelectric actuator and the driven body and fluctuations in the feed amount of the driven body are avoided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the case where the present invention is applied to a wristwatch is illustrated.

<First Embodiment>
FIG. 1 is a diagram showing an external configuration of a wristwatch according to the first embodiment of the present invention. As shown in FIG. 1, the wristwatch 1 includes a watch main body (device main body) 1a and a wristband 1b connected to the 12 o'clock position and the 6 o'clock position of the watch main body 1a. The watch main body 1a includes a housing (trunk) 200 and a disk-shaped dial plate 202 provided in the housing 200. On the upper surface of the dial plate 202, a second hand 61 and a minute hand (long hand). 62 and three indicator hands consisting of an hour hand (short hand) 63 are provided. On the dial 202, symbols (not shown) indicating time are arranged at equal intervals along the circumference of the dial 202, and symbols (in this embodiment, the symbols indicated by each of the display hands 61 to 63). The current time is displayed. Further, a crown 2 for performing time correction and calendar correction is attached to the watch body 1a.

  The dial 202 is provided with a date display window 204, a 24-hour display unit 205, a month display unit 206, and a year display window 208, which are hollowed out in a substantially rectangular shape. In the day display window 204, any one of “1” to “31” indicating “day” of the calendar is displayed. In this case, as will be described later, the first digit and the tenth digit are attached to different date indicators (calendar display vehicles), and the “day” of the calendar is indicated by the number attached to each date indicator. The The 24-hour display portion 205 is provided with symbols indicating the time divided into 24 equal parts along the circumference at equal intervals, and the time indicated by the 24-hour display hand (display pointer) 205a indicates “time”. Is displayed.

  In addition, the month display unit 206 indicates a calendar “month” along its circumference, for example, any symbol from “JAN” (in January) to “DEC” (in December). Are arranged at equal intervals, and the “month” of the calendar is displayed by a symbol indicated by the month indicator hand (display pointer) 206a. The year display window 208 displays any one of the numbers “0” to “3” indicating the year from the leap year, and displays the number “0” if it is a leap year. Thereafter, “1”, “2”, and “3” are displayed. Thereby, the user can know the “year” of the calendar.

  A disc-shaped main plate 303 (FIG. 3) having the same shape as the dial 202 is disposed in the timepiece main body 1a, and a calendar mechanism (calendar display means) is provided on the front side of the timepiece with the main plate 303 interposed therebetween. Has been placed. Note that one end of each gear of the calendar mechanism or the like or the needle movement mechanism E (FIG. 4) is pivotally supported on the base plate 303.

  FIG. 2 is a view showing a calendar mechanism. The calendar mechanism is supported on one surface of the main plate 303 (the front side of the timepiece 1), and the drive source is a piezoelectric actuator 71. The piezoelectric actuator 71 includes a piezoelectric element, and the vibration of the piezoelectric element causes the outer periphery of the rotor (driven body) 72 to strike, thereby rotating the rotor 72. The rotor 72 is integrally provided with a rotor pinion 72a, and an intermediate wheel 74 is engaged with the rotor pinion 72a. An intermediate wheel 75 is engaged with the intermediate wheel pinion 74a of the intermediate wheel 74, and an intermediate wheel 76 is engaged with the intermediate wheel pinion 75a. The intermediate wheel 76 meshes with a control wheel pinion 77, and the control wheel pinion 77 is formed integrally with the control wheel 78. Up to this point, the speed reducing wheel train is for turning the control wheel 78.

  The intermediate wheel 75 described above is provided with a spring switch 300 for detecting the feed amount of the rotor 72. As shown in FIG. 3, the spring switch 300 includes a spring contact 301 fixed to the support shaft of the intermediate wheel 75, and It is comprised from the conduction | electrical_connection terminal part 302 provided on the circuit board 303a provided in the ground plane 303. FIG. This conduction terminal portion 302 is connected via the spring contact 301 every time the feed amount of the rotor 72 becomes a feed amount that feeds the calendar for one day, that is, every time the intermediate wheel 75 rotates by an angle corresponding to the feed amount. Thus, it is configured as a part of the wiring pattern of the circuit board 303a so as to switch from the conductive state (closed state) to the non-conductive state (open state), and the control unit A (FIG. 4) described later closes the spring switch 300. By detecting the switching to the state, it is detected that the feed amount of the rotor 72 is the feed amount for sending the calendar for one day. In other words, the spring switch 300 functions as a rotor feed amount detection unit that detects the feed amount of the rotor 72. In FIG. 3, reference numeral 304 denotes a pressing plate that pivotally supports one end (clock face side) of each gear of the calendar mechanism.

  The control wheel 78 includes a plurality of claw wheels with different numbers of claws, and any one of the claw wheels is located above the control wheel 78 in FIG. A date indicator driving wheel 87 for turning the tenth date indicator 92 and a month display intermediate wheel 79 for turning the month indicator 82, which are located at the lower right of the control wheel 78 in the drawing, are respectively engaged. Here, numbers “0” to “9” are displayed at equal intervals in the circumferential direction on the outer peripheral surface of the first date wheel 89, and “empty area” and “ Numbers “1” to “3” are displayed at equal intervals in the circumferential direction. Note that the “empty area” is an area where there is no numerical description, and when the corresponding day corresponds to a single-digit “day” (that is, 1st to 9th), it is ranked 10th.

In the date display window 204 (FIG. 1) described above, the numbers “0” to “9” on the first date wheel 89 and the “empty area” or the numbers “1” to “1” on the tenth date wheel 92 are displayed. In combination with “3”, any number from “1” to “31” indicating “day” of the calendar is displayed.
When the control wheel 78 described above is rotated, first, the date indicator driving wheel 90 and the first-place date pinion 88 are rotated through the first-position feeding claw of the gear body corresponding to the first-place date wheel 89, and 1 is integrally formed therewith. The second date wheel 89 rotates, and the numbers “0” to “9” on the outer circumferential surface thereof are sent in the circumferential direction once a day in principle. In accordance with the rotation of the control wheel 78, the rotation of the 1st date wheel 89 advances, and when the 10th position is reached, the 10th position feed claw of the gear body corresponding to the 10th date wheel 92 is reached. , The date indicator driving wheel 87 and the 10th date pinion 91 are rotated, and the 10th date indicator 92 is rotated integrally therewith, and the “empty area” or the numbers “1” to “3” on the outer peripheral surface thereof. Are sent in the circumferential direction once every 10 days.

  In response to the rotation of the control wheel 78, the rotation of the 1st date indicator 89 and the 10th date indicator 92 advances, and when the date on which the indication of “month” is advanced, this time, the month indicator 82 is displayed. The month display intermediate wheel 79 and the month detection wheel 80 are rotated via the corresponding month feeding claw of the gear body, and the month wheel 82 is rotated integrally therewith. Then, the month indicator hand 206a connected to the month indicator 82 rotates to change from “JAN” (in January) to “DEC” (in December) indicating the “month” of the calendar on the month display unit 206. Any one of the symbols is pointed to, and the calendar “month” is displayed.

  The year detection intermediate wheel 83 is engaged with the month detection wheel 80, and the year feed wheel 84 is engaged with the year display intermediate wheel 83. The year feeding wheel 84 meshes with an year wheel (calendar display wheel) 85 that rotates the year display wheel 208a. Numbers “0” to “4” are displayed at equal intervals in the circumferential direction on the surface (clock face side) of the year display wheel 208a. In this case, the annual feeding wheel 84 is configured to rotate the year wheel 85 by 90 degrees for the first time after a period of one year. Accordingly, the year display wheel 208a is sent once a year, and the numbers “0” to “4” are displayed in order in the year display window 208. For example, the year display wheel 208a displays the year from the leap year. Thus, the “year” of the calendar is displayed.

That is, the calendar mechanism decelerates the rotation of the rotor 72 via the tooth wheel train and rotates the control wheel 78. By the rotation of the control wheel 78, the date wheel (the first date wheel 89 and the 10th date wheel) is rotated. The vehicle 92), the month wheel 82, and the year wheel 85 are configured to rotate.
Further, in the wristwatch 1, the crown 2 is supported so that it can be pulled out in the axial direction in multiple stages, and in the normal position where the crown 2 is not pulled out (the position of 0 step pulling (the position shown in FIG. 1)), the crown 2 Is in the idle position, the crown 2 meshes with the intermediate wheel 76 via the calendar correction wheel train (the gears 88a, 88b, 88c in FIG. 2), and the calendar can be corrected by the rotation of the crown 2, When the crown 2 is omitted, the crown 2 meshes with a hand movement mechanism E, which will be described later, via a correction wheel train, and the time can be adjusted by the rotation of the crown 2.

In the 24-hour display unit 205, the driving force is taken from the driving source of the hand movement mechanism E arranged on the back side of the main plate 303, unlike the driving source of the calendar mechanism. That is, the cylindrical vehicle body 93 is integrated with the hour wheel (the hour wheel (short hand) 63 supporting the hour hand 63) of the hand movement mechanism E, and the 24-hour detection wheel 94 is engaged with the cylindrical vehicle body 93. The 24-hour wheel 95 is engaged with the 24-hour detection wheel 94, and the 24-hour indicator hand 205a is rotated by the rotation of the 24-hour wheel 95. The 24-hour display hand 205a is sent 15 degrees (1/24 days) per hour.
The 24-hour detection wheel 94 is provided with a spring switch 310 (only a spring contact is shown in FIG. 2) which is substantially the same as the spring switch 300 provided in the intermediate wheel 75. When 205a indicates “midnight”, the state is switched from the open state to the closed state, and it is detected by the control unit A described later whether it is “midnight (24:00)”. That is, the spring switch 310 functions as a 24-hour detection means for detecting “midnight”.

  FIG. 4 is a diagram showing an electrical configuration of the wristwatch 1 together with a mechanical configuration. As shown in the figure, the wristwatch 1 includes a control unit A, a power generation unit B, a power supply unit C, a pointer drive unit D, a hand movement mechanism E that functions as a time display unit, a date mechanism drive unit F, And a calendar mechanism (only the rotor 72 is shown).

  The power generation unit B generates AC power and includes a rotating weight 45. The rotating weight 45 is provided so as to be able to turn with the movement of the user's wrist or the like, so that the turning (kinetic energy) of the rotating weight 45 is transmitted to the power generation device 40 via the speed increasing gear 46. It has become. The power generation device 40 includes a power generation stator 42, a power generation rotor 43 rotatably provided in the power generation stator 42, and a power generation coil 44 connected to the power generation stator 42. The rotor 43 is rotated by the turning (kinetic energy) of the rotary weight 45, and an AC voltage is induced in the power generation coil 44 by this rotation. In other words, while the wristwatch 1 is worn by the user, the rotating weight 45 turns as the user performs some operation to generate power.

  The power supply unit C rectifies and stores the AC voltage from the power generation unit B, boosts the stored power, and supplies power to each component. More specifically, the power supply unit C includes a diode 47 that functions as a rectifier circuit, a large-capacitance capacitor 48, and a step-up / down circuit 49. The step-up / step-down circuit 49 can perform step-up and step-down in multiple stages using the three capacitors 49a, 49b and 49c, and adjusts the voltage supplied to the pointer drive unit D by the control signal from the control unit A. be able to. Further, the output voltage of the step-up / step-down circuit 49 is also supplied to the control unit A by a monitor signal, whereby the control unit A monitors the output voltage. Here, the power supply unit C takes Vdd (high voltage side) as a reference potential (ground) and generates Vss (low voltage side) as a power supply voltage.

  The pointer drive unit D supplies various drive pulses to the hand movement mechanism E under the control of the control unit A. In the present embodiment, the pointer drive unit D includes a second hand drive unit D1 that drives the second hand 61, and an hour / minute hand drive unit D2 that drives the hour hand 63, the minute hand 62, and the 24-hour display hand 205a. More specifically, the second hand drive unit D1 includes a bridge circuit configured by a p-channel MOS 33a and an n-channel MOS 32a connected in series, and a p-channel MOS 33b and an n-channel MOS 32b. The second hand drive unit D1 includes rotation detection resistors 35a and 35b connected in parallel with the p-channel MOSs 33a and 33b, respectively, and sampling p-channel MOSs 34a and 34b for supplying chopper pulses to the resistors 35a and 35b. 34b. Therefore, by applying control pulses having different polarities and pulse widths from the control unit A to the respective gate electrodes of the MOSs 32a, 32b, 33a, 33b, 34a and 34b at the respective timings, a part of the hand movement mechanism E is obtained. Various drive pulses such as drive pulses having different polarities are supplied to the second hand moving mechanism E1 that constitutes the second hand movement mechanism E1.

  The hour / minute hand driving unit D2 is configured in substantially the same manner as the second hand driving unit D1, and a control pulse having a polarity and a pulse width different from the control unit A is applied to form the hour / minute hand constituting a part of the hand movement mechanism E. Various drive pulses such as drive pulses having different polarities are supplied to the hand movement mechanism E2.

  The hand movement mechanism E includes a second hand movement mechanism E1 and an hour / minute hand drive unit E2. The second hand moving mechanism E <b> 1 includes a stepping motor 10, and the stepping motor 10 rotationally drives the second hand 61. More specifically, the stepping motor 10 is excited in the drive coil 11 that generates a magnetic force by the drive pulse supplied from the second hand drive unit D1, the stator 12 excited by the drive coil 11, and the stator 12 inside. The rotor 13 is rotated by a magnetic field. Further, the stepping motor 10 is constituted by a PM type (permanent magnet rotating type) in which the rotor 13 is constituted by a disk-shaped two-pole permanent magnet. The stator 12 is provided with a magnetic saturation portion 17 so that different magnetic poles are generated in the respective phases (poles) 15 and 16 around the rotor 13 due to the magnetic force generated in the drive coil 11. Further, in order to define the rotation direction of the rotor 13, an inner notch 18 is provided at an appropriate position on the inner periphery of the stator 12, so that cogging torque is generated to stop the rotor 13 at an appropriate position. ing. The rotation of the rotor 13 of the stepping motor 10 is transmitted to the second hand 61 by the wheel train 50 including the second intermediate wheel 51 and the second wheel 52 meshed with the rotor 13 via the kana, and the second hand 61 is rotationally driven.

  The hour / minute hand drive unit E2 includes a stepping motor 20. When the stepping motor 20 rotates the minute hand 62, the hour hand 63 and the 24-hour display hand 205a are moved in conjunction with the rotation of the minute hand 62. Rotating drive. More specifically, the stepping motor 20 includes a stator 22 and a rotor 23, similar to the stepping motor 10, and the stator 22 has different magnetic poles depending on the magnetic force generated by the drive coil 21. A magnetic saturation portion 27 </ b> A is provided so as to occur at (poles) 25 and 26. Further, in order to define the rotation direction of the rotor 23, an inner notch 28A is provided at an appropriate position on the inner periphery of the stator 22 so that cogging torque is generated and the rotor 23 stops at an appropriate position. Yes.

  The rotation of the rotor 23 of the stepping motor 20 is such that the fourth wheel 26, third wheel 27, second wheel 28, minute wheel 29, hour wheel (hour indicating wheel) 93a meshed with the rotor 23 via the kana. These are transmitted to the hands by a train wheel 30 comprising a cylindrical body 93, a 24-hour detection wheel 94 and a 24-hour wheel 95. A minute hand 62 is connected to the second wheel & pinion 28, an hour hand 63 is connected to the hour wheel 93a, and a 24-hour indicator hand 205a is connected to the 24-hour wheel 95. The hour and minute are displayed by these hands in conjunction with the rotation of the rotor 23.

  Under the control of the control unit A, the date mechanism driving unit F applies an AC voltage to the piezoelectric element of the piezoelectric actuator 71 to cause the piezoelectric actuator 71 to vibrate, and the vibration causes the outer periphery of the rotor 72 to strike. The rotor 72 is driven to rotate, thereby driving the calendar mechanism.

  The control unit A controls each part of the wristwatch 1, controls the pointer driving unit D and the hand movement mechanism E, and rotationally drives the second hand 61, the hour hand 63, the minute hand 62, and the 24-hour display hand 205 a, thereby Is displayed, and when a spring switch (not shown) provided in the 24-hour detection wheel 94 is closed, the calendar mechanism is driven by the date mechanism drive unit F with the 24-hour detection as a trigger to feed the calendar. Do. At the time of calendar feeding, first, a one-day feeding process for rotating the calendar mechanism for one day is executed, and a calendar detection process for detecting whether the day is sent and determining whether it is a non-existing day is executed. When it is determined that it is a non-existing day, a calendar correction process is performed in which the calendar mechanism is driven to display the actual existing date and so-called month-end correction is performed.

FIG. 5 is a view showing the piezoelectric actuator 71 together with the peripheral configuration, and FIG. 6 is a sectional view thereof.
The piezoelectric actuator 71 is schematically configured by disposing piezoelectric elements 401 and 402 on both surfaces of a reinforcing plate 400 made of a metal material such as stainless steel, a base 71a fixed to the base plate 303, and a neck 71b on the base 71a. And a vibration part (arrangement area of the piezoelectric elements 401 and 402) 71c connected via the.
The piezoelectric elements 401 and 402 have a substantially rectangular shape, and are adhered to both sides of the portion so that the longitudinal direction thereof substantially coincides with the longitudinal direction of the substantially rectangular portion (a portion corresponding to 71c) of the reinforcing plate 400. These constitute the vibration part 71c.

The material of the piezoelectric elements 401 and 402 is not particularly limited. For example, lead zirconate titanate (PZT (registered trademark)), crystal, lithium niobate, barium titanate, lead titanate, lead metaniobate, polyfluoride Various materials such as vinylidene, zinc zinc niobate, and lead scandium niobate can be used.
Electrodes (not shown) made of nickel, gold, or the like are provided on the surfaces of the piezoelectric elements 401 and 402. As shown in FIG. 6, lead electrodes 405a and 405b fixed to the base 71a are provided on these electrodes. Spring contacts 406a and 406b extending from the electrodes contact each other, and the electrodes of the piezoelectric elements 401 and 402 and the lead substrates 405a and 405b are electrically connected via the spring contacts 406a and 406b.

As shown in FIG. 5, the base 71a is provided with a plurality of pin holes 407a, 407b, and 407c, and positioning pins (not shown) projecting from the base plate 303 in the pin holes 407a and 407c at both ends thereof are provided. The piezoelectric actuator 71 is inserted and positioned on the base plate 303. In this positioning state, a pressing plate 410 (FIG. 6) is disposed from above the piezoelectric actuator 71 (on the side opposite to the base plate 303), and screwed into the pin hole 407b from above. 411 is inserted, and the piezoelectric actuator 71 is fixed to the main plate 303 by the screw 411.
In this case, as shown in FIG. 6, when the circuit board 303a on the ground plate 303 is in contact with the lead board 405b, the circuit board 303a is electrically connected to the piezoelectric element 402 via the lead board 405b, and the presser A circuit board 303b that is in contact with the lead board 405a is provided on the back surface of the plate 410, and the circuit board 303b is electrically connected to the piezoelectric element 401 through the lead board 405a.

In the piezoelectric actuator 71, when the piezoelectric elements 401 and 402 are repeatedly applied with a voltage, the piezoelectric elements 401 and 402 expand and contract in the longitudinal direction, so-called longitudinal vibration (vibration in the X direction in FIG. 5), and piezoelectric elements. The contact portion 400a formed integrally with the reinforcing plate 400 is approximated to an elliptical orbit by simultaneously performing so-called bending vibration that is bent point-symmetrically with respect to the plane center of 401 and 402 in a direction orthogonal to the longitudinal vibration. It is configured to move along a trajectory R. In addition, the balance part 400b is integrally formed in the reinforcement board 400 in the symmetrical position of the contact part 400a so that the movement locus | trajectory of the contact part 400a may become the desired track | orbit R. FIG.
The rotor 13 is rotationally driven in the counterclockwise direction Z in FIG. 2 by the movement of the contact portion 400a along the orbit R to drive the calendar mechanism.

  Here, it is preferable that the resonance frequency of the longitudinal vibration and the resonance frequency of the bending vibration of the piezoelectric elements 401 and 402 are close to each other, more specifically, the resonance frequency of the bending vibration with respect to the resonance frequency of the longitudinal vibration. If the ratio is smaller than 1.00, a good elliptical orbit cannot be obtained, and if it is larger than 1.03, the vibration frequency at which the amplitudes of both vibrations simultaneously increase cannot be set. It is desirable to be greater than 0.00 and 1.03 or less. In addition, when the dimensional ratio between the long side and the short side of the piezoelectric elements 401 and 402 is smaller than 0.274, a good elliptical orbit cannot be obtained.

  In the present embodiment, as shown in FIG. 5, the rotor 72 is rotatably held by the rotor support body 420 and is disposed so as to be swingable around a pin 430 inserted through the rotor support body 420. At the same time, the pressing spring 435 wound around the shaft 431 provided on the base plate 303 is urged counterclockwise in the drawing, that is, urged toward the piezoelectric actuator 71 to come into contact with the contact portion 400a. As a result, the contact pressure between the rotor 72 and the piezoelectric actuator 71 is maintained at an appropriate pressure capable of rotating the rotor 72 with high efficiency when the piezoelectric actuator 71 is driven, and the feed amount of the rotor 72 by the piezoelectric actuator 71 (per unit time). (Feed amount) is sufficiently secured.

By the way, when the wristwatch 1 receives an impact from the outside due to dropping or the like, if the external impact force acts in a direction in which the rotor 72 and the piezoelectric actuator 71 are pressed, the piezoelectric actuator 71 or the rotor 72 may be damaged. . Further, if an external impact force acts in the above direction when the piezoelectric actuator 71 is driven, the amount of amplitude of the piezoelectric actuator 71 may be reduced, and the rotor 72 may not be sufficiently fed.
Therefore, in the present configuration, when the rotor 72 is urged toward the piezoelectric actuator 71 by the pressing spring (biasing means) 435 and is in contact, as shown in FIG. The arrangement configuration of the piezoelectric actuator 71, the rotor 72, the rotor support 420, the pressing spring 435, and the like is determined so as to be along the direction β in which the band 1b extends.
Here, the swing direction α1 is specifically the swing direction in which the center of gravity of the rotor block (unit) including the rotor 72 swings about the swing fulcrum (center G1 of the pin 430), in other words, It is perpendicular to the line segment L1 connecting the rotation center C1 of the rotor 72 and the swing fulcrum G1, and the angle θ1 between the swing direction α1 and the direction β in which the wristband 1b extends is 45 degrees or less, more preferably It is set to 30 degrees or less.

For this reason, when the wristwatch 1 receives an external impact force from a direction coinciding with the swinging direction α1 of the rotor 72, for example, the wristwatch 1 is in a posture in which the connecting side of the wristband 1b is directed in the gravity direction (the gravity direction is 6 o'clock). If the wristband 1b collides with the floor first, the impact of the fall can be absorbed by the wristband 1b, and the rotor 72 and the piezoelectric actuator 71 are pressed against each other. The impact force acting in the direction α1 can be reduced.
Further, when the wristwatch 1 receives an external impact force from other directions, for example, when the wristwatch 1 falls to the floor with a gravitational direction of 3 o'clock (the crown 2 side) or 9 o'clock (the opposite side of the crown 2). The impact force acting in the swing direction α1 is a component of the external impact force, and the impact force acting in the direction α1 pressing the rotor 72 and the piezoelectric actuator 71 is small.

Further, in the piezoelectric actuator 71, since the vibration portion 71b is connected to the base portion 71a via the narrow neck portion 71b, the vibration portion 71b swings in the direction γ1 (FIG. 5) swinging with respect to the neck portion 71b. Easy to do.
For this reason, when an external impact force acts greatly in the swing direction γ1, the vibration portion 71c is forcibly swung with respect to the neck portion 71b, and a load is applied to the neck portion 71b, and the vicinity of the neck portion 71b is damaged. In this configuration, as shown in FIG. 5, the direction γ1 in which the vibration part 71c easily swings with respect to the neck part 71b is also along the direction β in which the wristband 1b extends. The external impact force from the γ1 direction can be absorbed by the wristband 1b, and the forced swinging of the vibration part 71c due to the external impact force can be suppressed. As for the external impact force from directions other than the γ1 direction, the impact force acting in the γ1 direction has a small external impact force and does not cause forced oscillation of the vibration part 71c. Therefore, in this configuration, damage to the piezoelectric actuator 71 due to forced oscillation can be avoided.
More specifically, in this configuration, the angle θ2 between the swing direction γ1 and the direction β in which the wristband 1b extends is set to 45 degrees or less, more desirably 30 degrees or less, thereby forcing the swing. Damage to the piezoelectric actuator 71 can be avoided.

Thus, in this configuration, when the rotor 72 is urged toward the piezoelectric actuator 71 and is in contact, the swinging direction α1 of the rotor 72 is along the direction β in which the wristband 1b extends. 1 can receive an external impact force from any direction, the impact force acting in the direction α1 pressing the rotor 72 and the piezoelectric actuator 71 can be reduced, and the damage caused by the collision between the piezoelectric actuator 71 and the rotor 72 can be reduced. Variations in the feed amount of the rotor 72 can be avoided.
In addition, in this configuration, the direction γ1 in which the piezoelectric actuator 71 easily swings with respect to the neck portion 71b is set along the direction β in which the wristband 1b extends, so that forced swing due to an external impact force can be suppressed. Further, damage to the piezoelectric actuator 71 due to forced oscillation can also be avoided.
Further, in this configuration, since the load on the piezoelectric actuator 71 and the rotor 72 is reduced using the shock absorption of the wristband 1b, the shock resistance can be increased without arranging a buffer member. It is possible to provide the wristwatch 1 that has high impact resistance and can be easily miniaturized. In this configuration, although the material of the wristband 1b is not limited, it is desirable to use a material having shock absorption, for example, resin or rubber, as the material of the wristband 1b.

Second Embodiment
Next, a second embodiment of the present invention will be described. As shown in FIG. 7, in the wristwatch 1 according to the second embodiment, the angle θ1 between the swing direction α1 of the rotor 72 and the direction β in which the wristband 1b extends is 30 degrees or less, and piezoelectric The arrangement configuration of the calendar mechanism, the piezoelectric actuator 71, the rotor 72, the rotor support 420, the pressing spring 435, and the like is set so that the direction γ1 in which the actuator 71 swings with respect to the neck portion 71b substantially coincides with the direction β. Has been. Since the other configuration is the same as that of the wristwatch 1 according to the first embodiment, the same reference numerals are given to the same components, and the description thereof will be omitted, and different portions will be described in detail.
As described above, in this configuration, the swinging direction α1 of the rotor 72 is set within 30 degrees with respect to the direction β in which the wristband 1b extends. Therefore, even if the wristwatch 1 receives an external impact force, the rotor 72 and the piezoelectric actuator It is possible to reduce the impact force acting in the direction α <b> 1 against which the actuator 71 is pressed, and to avoid damage due to the collision between the piezoelectric actuator 71 and the rotor 72 and fluctuations in the feed amount of the rotor 72.
In addition, in this configuration, the direction γ1 in which the piezoelectric actuator 71 easily swings with respect to the neck portion 71b is made substantially coincident with the direction β in which the wristband 1b extends, so the external impact force received from the swing direction γ1. Can be efficiently absorbed by the wristband 1b, and the forced swinging of the piezoelectric actuator 71 due to an external impact force can be further suppressed as compared with the configuration of the first embodiment, and the piezoelectric actuator 71 by forced swinging can be suppressed. Can be more reliably avoided. Accordingly, it is possible to provide the wristwatch 1 that has high impact resistance and can be easily downsized.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. The wristwatch 1 according to the third embodiment is substantially the same as the wristwatch 1 according to the first embodiment, except that the piezoelectric actuator 71 is swingably supported and urged toward the rotor 72 side. In the following, parts having the same configuration are denoted by the same reference numerals, description thereof is omitted, and different parts are described in detail.
FIG. 8 is a diagram showing the piezoelectric actuator 71 together with the peripheral configuration. In this figure, the direction β in which the wristband 1b extends corresponds to the vertical direction of the paper.
In the wristwatch 1, the piezoelectric actuator 71 is swingably supported around a pin 421 inserted through the pin hole 407 b, and is a pressing spring (biasing means) 436 wound around a shaft 432 provided on the base plate 303. Thus, the rotor 72 is urged to be rotatably supported by the base plate 303, and the contact portion 400 a is in contact with the rotor 72.

In this configuration, as shown in FIG. 8, when the piezoelectric actuator 71 is biased and is in contact with the rotor 72, the swing direction of the piezoelectric actuator 71 (the center G1 (swing support point) of the pin 421) is changed. The arrangement configuration of the piezoelectric actuator 71, the push spring 436, and the like is determined so that the direction α2 in which the center C1 of the vibration portion 71c swings) is substantially the same as the direction β in which the wristband 1b extends. .
Thus, in this configuration, the piezoelectric actuator 71 is urged to come into contact with the rotor 72, and in this contact state, the swinging direction α2 of the piezoelectric actuator 71 substantially coincides with the extending direction β of the wristband 1b. Thus, the external impact force received from the swing direction α2 can be efficiently absorbed by the wristband 1b, and the direction in which the piezoelectric actuator 71 and the rotor 72 are pressed compared to the configuration of the first embodiment. The impact force acting on can be made smaller. Therefore, damage due to the collision between the piezoelectric actuator 71 and the rotor 72 and fluctuations in the feed amount of the rotor 72 can be reliably avoided.
In addition, in this configuration, the swing direction α2 substantially coincides with the direction in which the piezoelectric actuator 71 easily swings with respect to the neck portion 71b, and therefore, compared to the first embodiment, the piezoelectric actuator 71 due to external impact force. The forced oscillation of the piezoelectric actuator 71 due to the forced oscillation can be reliably avoided. Accordingly, it is possible to provide the wristwatch 1 that has high impact resistance and can be easily downsized.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described. The wristwatch 1 according to the fourth embodiment is substantially the same as the wristwatch 1 according to the first embodiment, except that a rotary drive device 100 is provided as shown in FIG. In the following, parts having the same configuration are denoted by the same reference numerals, description thereof is omitted, and different parts are described in detail.
FIG. 10 is a plan view of the rotary drive device 100. The rotary drive device 100 includes an annular rotating body (driven body) 101 and a piezoelectric actuator 102 that is disposed inside the rotating body 101 and drives the rotating body 101 to rotate. The piezoelectric actuator 102 is attached to the fixed plate 104 via a support body 103 that fixes the piezoelectric actuator 102 so as to be able to vibrate. The rotating body 101 has a gear formed on the outer periphery and is rotatably supported by the fixed plate 104. These are fixed to the main plate 303 via the fixed plate 104.

As shown in FIG. 11, the piezoelectric actuator 102 includes a reinforcing plate 105 formed in a substantially rectangular flat plate shape, and rectangular flat plate-shaped piezoelectric elements 106 provided on both surfaces of the reinforcing plate 105. .
The reinforcing plate 105 is made of stainless steel or the like, and includes a vibrating portion 105a where the piezoelectric elements 106 are arranged on both sides, and a base portion 105c connected to both sides of the vibrating portion 105a via a narrow neck portion 105b. One of the short sides of the vibrating portion 105a is integrally formed so that a contact portion 105d having a substantially arc-shaped cross section protrudes in the longitudinal direction substantially at the center in the width direction, and a through hole 107 is formed in the base portion 105c. Is formed.

  The piezoelectric element 106 is provided with electrodes in the same manner as the piezoelectric elements 401 and 402 described in the first embodiment. When a voltage is repeatedly applied from the circuit board 303a of the wristwatch 1, the piezoelectric element 106 is moved in the longitudinal direction. The so-called longitudinal vibration that expands and contracts and the so-called bending vibration that bends in a direction perpendicular to the longitudinal vibration in a point-symmetrical manner with respect to the plane center of the piezoelectric element 106 are performed simultaneously, as shown in FIG. The integrally formed contact portion 105d is configured to move along a trajectory R that approximates an elliptical trajectory.

The support 103 is formed of a hard plastic or the like, and includes a slide portion 109 that is slidably supported by the fixed plate 104 and a pair of fixed portions 110 that extend from both side edges of the slide portion 109. A screw hole 111 is formed in the fixing portion 110 at a position corresponding to the through hole 107 provided in the base portion 105 c of the reinforcing plate 105, and a screw 112 is screwed into the screw hole 111 through the through hole 107. As a result, the piezoelectric actuator 102 is fixed to the support 103.
The slide portion 109 is disposed in a slide groove (not shown) of the fixed plate 104 and includes a plurality of long holes 113 extending in the slide direction of the slide portion 109 (a direction coinciding with the longitudinal direction of the vibration portion 105a). The long holes 113 engage with screws and positioning projections (not shown) for slidably fixing the slide portion 109 to the fixing plate 104.

Further, as shown in FIG. 10, the fixed plate 104 is provided with a pair of spring support portions 104a on the opposite side of the contact portion 105d of the piezoelectric actuator 102 and on both sides of the piezoelectric actuator 102. The support portion 104a supports one end of the coil spring (biasing means) 120 along the longitudinal direction of the vibration portion 105a. The other ends of these coil springs 120 are respectively inserted and positioned in protrusions 103 a (FIG. 11) provided on the fixing portion 110 of the support body 103, and are fixed integrally to the support body 103 by this coil spring 120. The piezoelectric actuator 102 is biased upward in the paper surface in FIG. 10, and the contact portion 105 d is brought into contact with the inner surface of the rotating body 101.
As a result, the contact pressure between the rotating body 101 and the piezoelectric actuator 102 is maintained at an appropriate pressure that allows the rotating body 101 to slide with high efficiency when the piezoelectric actuator 102 is driven, and the piezoelectric actuator 102 feeds the rotating body 101 sufficiently. Secured.

Under the above configuration, in this wristwatch 1, the piezoelectric actuator 102 is driven as shown in FIG. 12, and this drive causes the rotating body 101 to slide (rotate) in the Z direction shown in FIG. The wheel train is driven to rotate.
By the way, in this configuration, as shown in FIG. 9, the biasing direction (swinging direction) α3 of the piezoelectric actuator 102 by the coil spring 120 is such that the direction substantially coincides with the extending direction β of the wristband 1b. A rotary drive device 100 is arranged.
Thus, since the urging direction α3 of the piezoelectric actuator 102 is set along the direction β in which the wristband 1b extends, the external impact force received from the α3 direction can be efficiently absorbed by the wristband 1b. The impact force acting in the direction in which the piezoelectric actuator 102 and the rotating body 101 are pressed can be reduced, and damage due to the collision between the piezoelectric actuator 102 and the rotating body 101 and fluctuations in the feed amount of the rotating body 101 can be avoided. .
Further, in this configuration, the biasing direction α3 coincides with a direction in which the vibrating portion 105a of the piezoelectric actuator 102 easily swings with respect to the neck portion 105b, so even if it receives an external impact force from this α3 direction, The wrist band 1b absorbs the impact force, so that the forced swinging of the piezoelectric actuator 102 can be suppressed, and damage to the piezoelectric actuator 102 due to the forced swinging can be avoided. Accordingly, it is possible to provide the wristwatch 1 that has high impact resistance and can be easily downsized.

  The above-described embodiments merely show one aspect of the present invention, and can be arbitrarily modified within the scope of the present invention. For example, in the above-described embodiment, the case where the piezoelectric actuator is used as the driving source of the calendar mechanism is illustrated, but the piezoelectric actuator may be used as the driving source of the hand movement mechanism E (time display unit). Further, the case where the rotating body (the rotor 72 or the rotating body 101) is rotationally driven by the piezoelectric actuator is exemplified. However, the driven body is a slider member guided so as to be movable in the linear direction, and the slider member is used as the piezoelectric actuator. May be driven in a linear direction. In this case, what is necessary is just to comprise so that either a charge level, a calendar | calendar, or time may be displayed with this slide member, for example.

  In the above-described embodiment, the present invention is applied to a wristwatch having a calendar mechanism. However, the present invention is not limited to this, and other wristwatches (including radio timepieces), wristwatch-type PDAs (Personal Digital Assistants), and mobile phones. The present invention can be widely applied to electronic devices such as the above, or electronic devices (including ornamental items) that include a driven body that can be driven by a piezoelectric actuator and also include a wristband.

It is a figure which shows the external appearance structure of the wristwatch which concerns on 1st Embodiment of this invention. It is a figure which shows a calendar mechanism. It is a figure for demonstrating the spring switch for the feed amount detection of a rotor. It is a figure which shows the electrical structure of a wristwatch with a mechanical structure. It is a figure which shows a piezoelectric actuator with a periphery structure. It is VI-VI sectional drawing of FIG. It is a figure which shows the calendar mechanism of the wristwatch which concerns on 2nd Embodiment with a periphery structure. It is a figure which shows the piezoelectric actuator which concerns on 3rd Embodiment with a periphery structure. It is a figure which shows the calendar mechanism of the wristwatch which concerns on 4th Embodiment with a periphery structure. It is a top view of a rotary drive device. It is a disassembled perspective view of a piezoelectric actuator. It is a figure which shows the track | orbit of a piezoelectric actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wristwatch (electronic device), 1a ... Clock body part (apparatus main body), 1b ... Wristband, 202 ... Dial, 71, 102 ... Piezoelectric actuator, 72 ... Rotor (driven body), 71a, 105c ... Base part, 71b, 105b ... neck portion, 71c, 105a ... vibrating portion, 101 ... rotating body (driven body), 401, 402 ... piezoelectric element, 435, 436 ... pressing spring (biasing means)

Claims (9)

In an electronic device including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body,
One of the piezoelectric actuator or the driven body is urged and brought into contact with the other member, and in this contact state, the swinging direction of the one member is aligned with the direction in which the wristband extends. And electronic equipment. In an electronic device including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body,
An electronic apparatus, wherein the driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, a swinging direction of the driven body is set along a direction in which the wristband extends.   The driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, the angle between the swinging direction of the driven body and the direction in which the wristband extends is within 45 degrees. The electronic device according to claim 2.   The piezoelectric actuator includes a base portion and a vibration portion coupled to the base portion via a neck portion, and a direction in which the vibration portion swings with respect to the neck portion is along a direction in which the wristband extends. The electronic apparatus according to claim 2, wherein   The driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, an angle between a swinging direction of the vibrating portion and a direction in which the wristband extends is within 45 degrees. The electronic device according to claim 4. In an electronic device including a device main body including a piezoelectric actuator and a driven body driven by the piezoelectric actuator, and a wristband connected to the device main body,
The piezoelectric actuator has a base portion and a vibration portion connected to the base portion via a neck portion, and a direction in which the vibration portion swings is along a direction in which the wristband extends. Electronic equipment.   The driven body is urged and brought into contact with the piezoelectric actuator, and in this contact state, an angle between a swinging direction of the vibrating portion and a direction in which the wristband extends is within 45 degrees. The electronic device according to claim 6.   The electronic apparatus according to claim 6, wherein the driven body is a rotating body that is rotationally driven by the piezoelectric actuator or a slider that is driven in a linear direction by the actuator. The electronic device according to claim 1, wherein the electronic device is configured as a timepiece having a time display unit that displays time.

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