JP2003098278A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the possibility of disturbing putting-in and -out of a battery into a battery storage recess, and to restrain rubbing in an inner surface electrode of a piezoelectric element to the minimum. SOLUTION: This wrist watch type electronic device 1 with an acoustic signal generating function has a wrist watch type electronic device main body 2 provided with the battery storing recess 20 for storing a button type battery 22, and a battery lid 30 attached detachably to the main body 2 to store the button type battery 22 inside the recess 20 by closing a circular opening 23 of the battery storage recess 20. The battery lid 30 is provided with a battery lid main body 40, the diaphragm-like piezoelectric elements 60 attached to an inner face of the main body 40 to generate an acoustic signal, and a lead terminal 70 attached to the battery lid main body 40 to connect electrically an electrode 26 of the button type battery 22 to the inner surface electrode facing to the button type battery 22 out of the piezoelectric elements 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device such as an electronic timepiece with an alarm, and more particularly to an acoustic signal generating device in which a diaphragm piezoelectric element for generating an acoustic signal is incorporated in a battery cover of a button type battery. It is related to wristwatch type electronic devices with functions.

[0002]

2. Description of the Related Art In a conventional electronic timepiece with an alarm of this type, a diaphragm-shaped or thin-film piezoelectric element is bonded to the front surface of a metal sound emitting plate on the back surface thereof, and the sound emitting plate is attached to the battery cover at its outer peripheral edge portion. It is fixed to the main body so that the film can vibrate, and a driving voltage signal is input between the inner surface electrode of the piezoelectric element and the fixed peripheral edge of the surface of the sound emitting plate, and the thin film piezoelectric element vibrates and sounds together with the sound emitting plate. To do. The drive signal to this piezoelectric element is
It is given from a side of the electronic timepiece main body through a pair of lead terminals extending toward the sound emitting plate and the inner surface electrode of the piezoelectric element.

[0003]

However, the battery lid of the button type battery is circular, and the battery lid is rotated around the central axis and is attached to and detached from the peripheral wall of the opening of the battery housing recess of the electronic timepiece body. Therefore, of the lead terminals for inputting the drive signal to the piezoelectric element, the contact of the lead terminal that is in contact with the inner surface electrode of the piezoelectric element is the inner surface every time the battery lid is rotated when opening and closing the battery lid. Rub on the electrodes. The range (length) of this rubbing increases as the distance from the central axis of the battery lid that substantially corresponds to the center of the battery housing recess increases, and the electrode terminals are scraped off due to the rubbing, and the timbre of the alarm sound and There is a possibility that the volume may change or the electrical contact at the contact may deteriorate. On the other hand, if the lead terminal is extended to a position coinciding with the central axis of the battery lid and an attempt is made to arrange the contact of the lead terminal at the axis, the lead terminal does not interfere with the insertion or removal of the battery into or from the battery housing recess. become.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the possibility that a battery may be prevented from coming in and out of a battery accommodating recess, and to prevent the electrodes on the inner surface of the piezoelectric element from being disturbed. An object of the present invention is to provide a wristwatch-type electronic device with an acoustic signal generation function that is capable of minimizing rubbing.

[0005]

In order to achieve the above-mentioned object, an electronic device of the present invention has an electronic device body having a battery accommodating recess for accommodating a button-type battery, and a button having a circular opening in the battery accommodating recess closed. A battery lid detachably attached to the electronic timepiece main body for holding the type battery in the recess, the battery lid main body and a diaphragm for acoustic signal generation attached to the inner surface of the main body. Piezoelectric element, and a lead terminal attached to the battery lid body and electrically connecting the electrode of the button-type battery and the electrode of the piezoelectric element.

In the electronic device of the present invention, since the lead terminal is attached to the body of the battery lid, the lead terminal can move almost integrally with the body of the battery lid when the battery lid is opened and closed. There is little risk that the electrode of the diaphragm-shaped piezoelectric element integrated with the main body will rub against the contact of the lead terminal.

Therefore, there is little possibility that the electrode formed on the inner surface of the piezoelectric element on the inner surface of the battery lid body will be scraped by rubbing. As a result, it is less likely that the tone color or the magnitude of an acoustic signal such as an alarm sound will change, or that a contact failure at a contact will occur. Further, even if the lead terminal is extended to the vicinity of the central portion of the battery accommodating concave portion, there is no possibility that the lead terminal interferes with the loading and unloading of the battery.

In this specification, "wristwatch type" with respect to "electronic device" is typically a battery or an acoustic device having a maximum diameter (dimension) in the longitudinal direction of about 3 to 5 cm or less like a wristwatch. This refers to a small electronic device in which the space for disposing a diaphragm-shaped piezoelectric element for signal generation is limited, and is typically mounted on a wrist or the like. However, as long as it is of a similar size, even if it is hung with a string etc. instead of being worn on the wrist,
It may be used in other usage modes. In this specification, the "acoustic signal" typically refers to an acoustic notification signal such as an alarm sound, but is not limited to the alarm sound.

The piezoelectric body of the piezoelectric element is typically
It is made of a piezoelectric ceramic material in the form of a diaphragm, that is, in the form of a film or a thin plate, and is typically bonded or affixed to a metal sound emitting plate via a bonding layer, and the sound emitting plate is attached to the battery lid main body at the peripheral portion. Fixed. More specifically, typically, a recess is formed in the battery lid main body to provide a space or cavity for sound emission, and the outer peripheral edge portion of the sound emitting plate that functions as a vibration film or a diaphragm is fixed to the peripheral wall of the recess. As a result, the vibration of the piezoelectric element generated by the driving signal is transmitted to the sound emitting plate and is sounded (that is, the diaphragm or film including the sound emitting plate whose outer peripheral edge is fixed and the piezoelectric element bonded to the sound emitting plate). Is generated by vibrating in response to a stress fluctuation occurring in the piezoelectric element along with a driving voltage signal applied to the piezoelectric element). The sound emitting plate and the piezoelectric element are typically circular, but may have other shapes. When the sound emitting plate and the piezoelectric element are circular, the electrodes on the surface of the piezoelectric element are also typically circular. However, the electrodes may have other shapes, and
The shapes of both do not have to be similar. The sound emitting plate is typically a metal such as stainless steel or brass. In that case,
The electrode on the back side of the piezoelectric element may also serve as a sound emitting plate to which the thin film piezoelectric material of the thin film piezoelectric element is bonded via a bonding layer. Here, the bonding layer enhances the electrical contact and mechanical coupling strength between the piezoelectric element and the sound emitting plate. However, in some cases, the sound emitting plate may be made of other material such as resin or ceramic material instead of metal. If desired, the thin plate piezoelectric element may be provided at the outer peripheral portion of the battery without using the sound emitting plate. It may be fixed directly to the lid body.

In the electronic device of the present invention, typically, the battery lid main body is provided with a lead terminal mounting recess on the inner surface thereof, and the lead terminal is fitted into the recess at the base end portion having a shape complementary to the lead terminal mounting recess. It is inserted and fixed to the battery lid body.
In that case, since the peripheral wall of the lead terminal mounting recess restricts the movement of the base end portion of the lead terminal, even if the lead terminal receives an external force in the direction along the extending surface of the terminal when the battery lid is opened and closed, There is little risk of displacement, and there is less risk of the contact on the tip side of the lead terminal rubbing the inner surface electrode of the piezoelectric element. Further, instead of the recessed portion or together with the recessed portion, a protruding portion may be formed on the battery lid main body, and the lead terminal may be provided with a recessed portion or a through hole having a shape complementary to the protruding portion. However, if the base end portion of the lead terminal can be firmly fixed to the battery lid main body, the battery lid main body may not be provided with a lead terminal mounting recess or the like on the inner surface, if desired. .

Also, in this electronic device, typically, the lead terminals extend in the radial direction of the battery lid (beam shape).
An arm portion is provided, and a tip portion of the beam-shaped arm portion located along the rotation center of the battery lid is configured to come into contact with the inner surface electrode of the piezoelectric element. In that case,
The risk that the lead terminal receives a force that causes the contact to be displaced is minimized. However, in the case where the beam-shaped arm of the lead terminal has sufficient rigidity, the contact of the lead terminal may be offset from the center of rotation of the battery lid to some extent. In this case, the lead terminals may extend in the radial direction before or beyond the position corresponding to the central axis, or may extend beyond the position, or the lead terminals may extend in a direction different from the radial direction. .

Further, in this electronic device, typically, the beam-shaped arm portion of the lead terminal passes through the contact point with the inner surface electrode of the piezoelectric element and is on both sides at right angles to the extending direction of the beam-shaped arm portion. It has elastic support legs in the form of leaf springs, etc., which extend in the direction of abutting against the electrodes of the button-type battery at both ends. In that case, since the contacts can be elastically supported by the leaf spring-shaped support legs, even if the rigidity of the beam-shaped arm portion is relatively low, the inside of the piezoelectric element is strong enough to ensure electrical contact. It becomes possible to press the contact of the lead terminal against the surface electrode. The support legs typically have a symmetrical structure and shape, but in some cases, the structure or shape of the pair of support legs may be misaligned, or there may be an odd number of support legs. Further, when the rigidity of the beam-shaped arm portion is relatively high, the supporting leg portion may be omitted. Even if such a structure that requires a relatively wide lead terminal is adopted, it is possible to avoid the possibility of obstructing the attachment / detachment of the battery, as described above, the lead terminal is attached to the battery lid body. by.

In addition, in this electronic device, typically,
A dome-shaped contact protrusion is formed on a tip portion of the beam-shaped arm portion of the lead terminal that comes into contact with the inner surface electrode of the piezoelectric element. In that case, electrical contact with the electrode surface can be ensured without damaging the inner surface electrode of the piezoelectric element.
The dome-shaped projection is formed by, for example, a punch. However, depending on the case, it may be configured to provide a contact surface having another shape such as being bent in a dogleg shape.

A wristwatch type electronic device with an acoustic signal generating function is typically an electronic timepiece with an alarm,
The alarm sound is a notification of a desired time or the like by an electronic timepiece. In that case, the electronic timepiece may further have other functions. However, if desired, even if the alarm sound remains the notification of the desired time by the electronic timepiece, the electronic device can be used as a personal digital assistant, etc. It may be one that is provided mainly and is not typically called a timepiece.
Furthermore, in some cases, the electronic device does not have a clock function, and the alarm sound conveys information other than the time, or even if the electronic device has a clock function,
The alarm sound may convey information other than the time.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a preferred embodiment of the present invention will be described based on a preferred embodiment shown in the accompanying drawings.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a part of an electronic timepiece with alarm 1 as a wristwatch type electronic device with an acoustic signal generating function according to the present invention. 2 shows the battery lid 30 of the electronic timepiece 1 of FIG.

The electronic timepiece 1 includes an outer case 11, an outer glass 12, a liquid crystal panel 13, an EL panel 14 associated therewith, a module 15, and an alarm generation I.
It has an electronic timepiece body 2 including a C16, a circuit 17, and the like.
The electronic timepiece body 2 further includes a battery frame 21 that defines a battery housing recess 20 in the recess 19 that is open on the back surface 18 side.

A button type battery 2 is provided in the battery accommodating recess 20.
2 is attached, and the battery lid 30 is attached to the circular opening 23 of the recess 19 of the electronic timepiece body 2 including the battery housing recess 20. The negative electrode 24 forming the end surface of the small-diameter bottomed cylindrical portion inside the battery 22 is electrically connected to the circuit 17 or the module 15 via the negative side terminal piece (not shown) on the bottom surface 25 of the battery frame 21. Has been done. On the other hand, battery 2
The positive electrode 26, which is formed of a large-diameter bottomed cylindrical portion on the outer side of 2, is a positive-side terminal piece (not shown) on the peripheral surface 27 of the battery frame 21.
Is electrically connected to the circuit 17 and the module 15 via.

The battery lid 30 is made of an electrically insulating resin and has a sound emitting plate mounting recess 42 on the inner surface 41 thereof, and a sound emitting recess further recessed to provide a sound emitting space 43a in the central region of the recess 42. A battery lid main body 40 having a sound emitting plate 43 and a sound emitting plate mounting recess 4 forming a peripheral wall of the sound emitting recess 43.
2 is a metal disk-shaped or circular film-shaped sound emitting plate 50 fixed to the outer peripheral portion 51, and a conductive bonding layer (not shown) concentrically with the inner surface 52 of the sound emitting plate 50 at the opposing surface 61. Disk-like or circular film-like piezoelectric body 60 attached via
And a lead terminal that is attached to the battery lid body 40 and electrically connects a thin film electrode, that is, an inner surface electrode (not shown) formed on the inner surface 62 of the piezoelectric body 60 and the positive electrode 26 of the battery 22. 70 and. When the diameter of the battery 22 is about 2 to 5 mm, the thickness of the piezoelectric body of the piezoelectric element 60 having the same diameter as the battery 22 and the thickness of the sound emitting plate 50 are about 0.2 mm, and the thickness of the inner surface electrode of the piezoelectric element 60. It is an order of magnitude smaller than this. However, each size may be larger or smaller, if desired. Electrode piezoelectric body 60 and thin-film electrodes (not shown) on its inner surface and outer surface 61
The conductive bonding layer (not shown) forms a piezoelectric element as a whole. Therefore, in the following, the piezoelectric body 60 is referred to as the piezoelectric element 60.
To consider.

The battery lid main body 40 is provided with a plurality of locking protrusions 44 at intervals at the peripheral edge of the rear end and has an engaging groove 45 such as a coin on the outer surface 46. Therefore,
The lid main body 40 is fitted into the battery lid mounting concave portion 19, the locking protrusions 44 protruding outward in the radial direction are pushed to the corresponding engaging protrusions 28 of the outer case 11, and the coin or the like is engaged with the groove 45. Then, by rotating around the central axis Ch, the locking surface 44 of the locking projection 44 of the lid body 40
The battery lid body 40 can be fixed to the outer case 19 by engaging a with the locking surface 28 a of the engaging protrusion 28 of the outer case 11.

Sound emission space 43a of the battery lid body 40
The sound emitting plate 50 fixed to the bottom surface 42a of the sound emitting plate mounting recess 42 of the battery lid body 40 at the peripheral portion at the opening of the sound emitting recess 43 that gives the piezoelectric element 60 bonded to the inner surface 52 thereof. At the same time, the film can vibrate in a predetermined circular film vibration mode mainly in the central portion facing the recess 43. When the battery lid 30 is attached to the outer case 11 by the locking protrusions 44 of the battery lid body 40, as shown in FIG. 1, the drive signal input terminal piece 29 of the piezoelectric element 60 is replaced by the piezoelectric element. The inner surface 52 of the sound emitting plate 50 comes into contact with the peripheral edge of the conductive sound emitting plate 50 that functions as a rear surface side terminal of the sound emitting plate 60.

In this example, for simplicity, the battery lid 30
Although it is described as being directly attached to the outer case 11 on the back side thereof, it goes without saying that the back cover of the electronic timepiece main body 2 is provided on the back side of the outer case 11 and the opening 23 is formed in the back cover. Alternatively, the battery lid 30 may be engaged with the back lid to close the opening 23.

The battery lid body 40 further has an inner surface 41,
There is a wide lead terminal mounting recess 47 extending in the radial direction R of the lid body 40 up to the sound emitting plate mounting recess 42.
A base end portion 75 of an arm portion 74 of the lead terminal 70 having side surfaces 71, 72 and an end surface 73 having a shape complementary to the recess 47 is attached to the base end portion 75. Holes 76, 76 for heat-welding or caulking the resin material of the battery lid body 40 are formed in the base end portion 75, and the projections 4 for heat-welding or caulking the recess 47 are formed.
The side surfaces 71, 72 and the end surface 73 of the base end portion 75 are fitted in the holes 76, 76 of the base end portion so that the side surfaces 71, 72 and the end surface 73 are attached to the base end portion 75.
Side walls 47a, 47b, 47c of the recess 47 having a shape complementary to
The protrusions 48, 4 while fitting into the recess 47 while facing the
The base end portion 75 of the lead terminal 70 is attached to the concave portion 47 of the battery lid main body 40 by partially melting or crimping 8.

Lead terminal 70 made of a spring metal material
In addition to the arm portion 74 extending inwardly in the radial direction R, when viewed from the plan view (bottom view) of FIG. 1, at the tip end 75 of the arm portion 74 with respect to the extending direction R of the arm portion 75. It has a pair of leaf spring-like elastic support legs 77, 78 extending in substantially perpendicular directions X1, X2.

More specifically, the arm portion 74 has a base end portion 7
5, a long and slender rectangular arm body 79, and a transition portion 80 tapered at the tip of the arm body 79.
And a narrow arm tip 81 extending in a radial direction from the tip of the transition portion 80, and a piezoelectric element is provided at a portion where the arm tip 81 and the supporting legs 77 and 78 intersect in a T shape. Element 6
No. 0 inner surface electrode (not shown) is formed with a dome-shaped protrusion 82 whose tip abuts. The protrusions or protrusions 82 are formed by punches, for example. At the tip 82 a of the dome-shaped protruding portion 82, the battery lid 30 is attached to the outer case 1.
When it is mounted on the battery cover 1, it is located substantially on the rotation center axis line Ch of the battery lid 30.

The support legs 77 and 78 extend from the arm tip 81 in the lateral directions X1 and X2, respectively, and extend substantially parallel to the inner surface electrode of the piezoelectric element 60 and the end face 26a of the positive pole 26 of the battery 22. Parts 83, 84 and button type battery 22
Toward the plus extreme surface 26a of the base side leg portions 83, 8
4 has diagonally extending distal end side leg portions 85 and 86, and at the extending ends of the distal end side leg portions 85 and 86, projecting portions 87 and 88 serving as contact terminals to the end surface 26a of the positive pole 26 are provided. Has been formed. Therefore, in the lead terminal 70, the dome-shaped projecting portion 8 is formed in a state where the tip portions 87 and 88 of the spring-supporting leg portions 77 and 78 are in contact with the plus extreme surface 26 a of the battery 22.
2 is pressed against the inner surface electrode of the piezoelectric element 60 and brought into contact therewith.

In the alarm-equipped electronic timepiece 1 in the form of a wristwatch constructed as described above, an electric connection is made to the inner surface electrode of the piezoelectric element 60 fixed to the main body 40 of the battery lid 30 so that the film can vibrate. Since the lead terminal 70 is fixed to the battery lid main body 40, the entire battery housing recess 20 can be opened toward the back surface side when the battery lid 30 is removed. Loading of the battery in the L direction can be easily performed. That is, temporarily, the piezoelectric element 60
When a lead terminal for making an electrical connection to the inner surface electrode of the device projects from the module side 15 like the lead terminal 29, the lead terminal extends to the surface of the piezoelectric element 60 in the battery housing recess 22. It is necessary to project, and the projecting lead terminal may interfere with the attachment / detachment of the battery 22 at the entrance of the battery accommodating concave portion 22, but in the electronic timepiece with alarm 1, the lead terminal 70 is attached to the battery lid 30. Since it constitutes a part, there is no fear of obstruction of such attachment and detachment.

Since the lead terminal 70 for making an electrical connection to the inner surface electrode of the piezoelectric element 60 fixed to the battery lid body 40 is fixed to the battery lid body 40, the battery lid 30 can be opened and closed. Also in this case, the lead terminals 70 attached to the battery lid main body 40 are less likely to be displaced and rubbed against the inner surface electrodes of the piezoelectric element 60 fixed to the battery lid main body 40. There is little risk of scraping. Therefore, there is less concern that the electrical contact at the contact will become worse and that the vibration characteristics of the piezoelectric element 60 will change.

In the electronic timepiece with alarm 1, the dome-shaped contact 82 at the tip of the arm 74 of the lead terminal 70 is
Since it is located along the rotation center axis line Ch of the battery lid 30,
Since the lead terminal 70 merely makes point contact with the inner surface electrode of the piezoelectric element 60, the risk of the vibration of the piezoelectric element 60 being restricted by the lead terminal 70 can be suppressed to a minimum. Further, the contact 82 located on the rotation center axis Ch of the battery lid 30 makes the contact 82 a contact surface even if the battery lid 30 is rotated around the center axis Ch in the C1 and C2 directions when the battery lid 30 is attached and detached. The lead terminals 70 may be arranged along the surface 62 of the piezoelectric element 60 or the terminal surface of the battery 22 because the lead terminals 70 may be practically not subjected to the force of moving along or the risk of receiving the force may be minimized. There is little risk of misalignment. Further, in the electronic timepiece 1 with alarm, the lead terminal 7
The base end portion 75 of 0 is located in the mounting recess 47 having a shape substantially complementary to the base end portion 75, and the displacement of the base end portion 75 in the plane of the base end portion 75 is caused by the side wall 47a of the recess portion 47. , 47
Since it is regulated or substantially prohibited (blocked) by b and 47c, even if a force that causes the base end portion 75 of the lead terminal 70 to be displaced, the lead terminal 70 may be displaced. It is less likely that the contact 82 of the lead terminal 70 rubs on the piezoelectric element 60. Yes. Therefore, the inner surface electrode of the piezoelectric element 60 may be scraped off to deteriorate the electrical contact, or the diaphragm or membrane including the piezoelectric element 60 and the sound emitting plate 50 may be changed in vibration characteristics or magnitude of vibration. Less is.

In addition, the contact 82 of the lead terminal 70 has the arm portion 74 at the tip of the arm portion 74 of the lead terminal 70.
Since it is supported by elastically deformable support legs 77, 78 extending on both sides in a direction orthogonal to the extension direction of the contact terminal 82, the contact 82 of the lead terminal 70 is stably supported by the support legs 77, 78. It can be pressed against the inner surface electrode of the piezoelectric element 60, and as a reaction thereto, the tip contact points 87, 88 of the support legs 77, 78 are elastically pressed against the end surface of the positive electrode 26 of the battery 22, so that an electrical connection is made. Can be secured.

When the battery lid 30 is mounted on the outer case 11 in such a state, the lead terminal 7 is attached to the piezoelectric element 60.
A voltage is applied via 0 and 29, expansion and contraction in the direction along the extending plane occurs in accordance with the drive signal from the lead terminal 29 serving as a drive signal transmission path, and the film vibrates together with the sound emitting plate 50.
An alarm sound can be emitted.

In the above, the lead terminal 70 is the battery 2
Although the example of being supported by the two leaf spring-like support leg portions 77 and 78 on the second side has been described, the center axis line Ch may be changed even if it is supported by three or more support leg portions instead. It may be supported by a coil spring or the like that extends along. In addition, depending on the case, for example, the spring-like support legs 77, 78 are brought into contact with the inner surface electrode of the piezoelectric element 60 at the position of the node in a predetermined membrane vibration mode, and on the central axis Ch. The contact 82 may be brought into contact with the battery 22.

In the illustrated example, the central axis Ch of the battery lid 30 is
Is shifted with respect to the center Cm of the circular films 50 and 60, but both Ch and Cm may be the same.

In the above, the example in which the lead terminal is attached to the battery lid of the wrist watch type electronic device has been shown, but the same lead terminal may be attached to the battery lid of other types of electronic devices.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of an electronic timepiece with an alarm according to a preferred embodiment of the present invention (viewed in a direction along a line I-I in FIG. 2A).

2A and 2B are views for explaining a structure of a battery cover of the electronic timepiece with alarm of FIG. 1, in which FIG. 2A is a bottom view of the battery cover, and FIG. 2B is a cross-sectional view taken along line IIB-IIB of FIG.

[Explanation of symbols]

1 electronic timepiece with alarm (wristwatch type electronic device with alarm) 2 electronic timepiece main body (electronic device main body) 20 battery accommodating recess 22 button type battery 30 battery lid 50 sound emitting plate 60 piezoelectric element (plate-shaped piezoelectric body) 70 lead Terminal

Claims (6)

[Claims] 1. A wristwatch type electronic device main body having a battery accommodating recess for accommodating a button battery, and a circular opening of the battery accommodating recess for closing the button battery in the battery accommodating recess. An electronic device having a battery lid removably attached to an electronic timepiece body, wherein the battery lid is a battery lid body, and a diaphragm-shaped piezoelectric element for acoustic signal generation attached to an inner surface of the body. An electronic device having a lead terminal attached to the battery lid body and electrically connecting an electrode of the button-type battery and an electrode of the piezoelectric element. 2. The battery lid main body is provided with a lead terminal mounting recess on the inner surface thereof, and the lead terminal is fitted into the recess at a base end portion of a shape complementary to the lead terminal mounting recess and fixed to the battery lid main body. The electronic device according to claim 1, which is provided. 3. The lead terminal includes a beam-shaped arm portion extending in a radial direction of the battery lid, and a piezoelectric element is provided at a tip portion of the beam-shaped arm portion substantially located on a rotation center of the battery lid. The electronic device of claim 2, configured to contact an inner surface electrode of the. 4. The beam-shaped arm portion of the lead terminal comprises:
The piezoelectric element is provided with elastic supporting leg portions which extend through the contact point with the inner surface electrode of the piezoelectric element at right angles to the extending direction of the beam-shaped arm portion, and the supporting leg portions are provided at both ends of the button type battery. The electronic device according to claim 3, which is in contact with the electrode. 5. The dome-shaped contact protrusion is formed on a tip end portion of the beam-shaped arm portion of the lead terminal that comes into contact with the inner surface electrode of the piezoelectric element, according to any one of claims 2 to 4. Electronic device as described. 6. The electronic device according to claim 1, wherein the electronic device includes an electronic timepiece.