JP2004347498A - Contact structure body of timepiece and clock equipped with its structure body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic timepiece equipped with a contact structure body which does not have in practice a possibility that an end may fall, even if a transverse force is applied. <P>SOLUTION: The contact structure body 8 of the electronic timepiece 1 comprises a rigid conductive pin 70 equipped with a long and slender rigid body 71, a frame 40 having a small diameter hole 45 to which the end of the rigid body 71 of the pin is fitted as insertable/retractable, and an elastic means 80 exerts the elastic force to the pin so as to make displacement to a direction projecting the end of the rigid body 71 of the pin from the small diameter hole 45. Typically, the rigid conductive pin 70 comprises a base end side stopper 72 having a diameter larger than the rigid body 71 in addition to the rigid body 71. The frame 40 comprises a large diameter hole 46 which holds a large diameter caging part of the pin, in addition to the small diameter hole 45, and abuts on the base end side stopper 72 of the pin at a level difference 47 between the large diameter hole and the small diameter hole. The elastic means 80 exerts the elastic force to the base end side stopper 72 of the pin in the A1 direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a contact structure and an electronic timepiece provided with the same.
[0002]
[Prior art]
In a small electronic timepiece such as a wristwatch, a piezoelectric element is attached to the inner surface of the back cover, and the piezoelectric element is vibrated by an electric drive signal of an audible frequency, thereby causing the piezoelectric element to vibrate and emit a buzzer sound or the like. It is known. In order to supply driving energy to the piezoelectric element, it is necessary to extend a contact member for ensuring electrical contact from the main body of the wristwatch to the surface electrode of the piezoelectric element on the inner surface or the opposing surface of the back cover. The piezoelectric element extends over more than half of the back cover so that sufficient vibration and sound can be generated. Also, on the main body side, the battery disposed close to the back cover so that replacement can be easily performed is typically performed using an inner diameter of the main body case so as to maximize its capacity. Has a diameter of more than half. Therefore, the contact member of the piezoelectric element with respect to the facing surface electrode protrudes from the main body toward the back cover at a position shifted from the center axis of the case in order to avoid the area occupied by the battery.
[0003]
In this type of conventional electronic timepiece, a coil spring is used as a contact member so that a large contact pressure can be secured for a long period of time. For example, as shown in FIG. 6, a conductive coil spring 105 that is disposed in the coil spring receiving hole 102 of the battery frame 101 and one end 103 of which is pressed against an electrode on the surface 104 a of the circuit board 104 has one end on the inner surface of the back cover 107. Is pressed at the other end 106 (imaginary line) against the electrode on the opposing surface 108a of the piezoelectric element 108 adhered on the surface 108b.
[0004]
However, between the surface 108a of the piezoelectric element 108 and the opposing surface 101a of the battery frame 101, there is a gap G1 for allowing the film vibration of the piezoelectric element 108, and the coil spring 105 is located at the center of the case (not shown). Since the rear cover 107 protrudes toward the piezoelectric element 108 of the back cover 107 at a position shifted from the axis, when the back cover 107 is rotated around the central axis with respect to the case to screw the back cover 107 to the case, As shown by the solid line 106a, the tip 106 of the coil spring 105 frictionally engages with the piezoelectric element 108 on the inner surface of the back cover 107 and is pulled in the screwing rotation direction E1. As a result, the coil spring 105 may fall in the direction E1 in the vicinity of the end portion 106 and the vicinity thereof, may be pulled into the gap G1, may be damaged, or may be short-circuited by touching another circuit component. In some cases, vibration of the piezoelectric element 108 may be hindered. When the end 106 (106 a) is damaged, for example, when the back cover 107 is repeatedly opened and closed, it may be difficult to obtain a desired contact between the tip 106 of the coil spring 105 and the surface electrode of the piezoelectric element 108. There is also. It should be noted that the electrical contact between the opposite end 103 of the coil spring 105 and the circuit board 104 may be incomplete due to the pulling or biting of the end 106.
[0005]
As shown in FIG. 7, in order to avoid the biting of the tip portion 106 of the coil spring 105, the tip portion 106 of the coil spring 105 projecting from the back cover side surface 101a of the battery frame 101 is protected as shown in FIG. A cylindrical projection 109 serving as a coil spring guide is formed on the battery frame 101 around the projecting tip 106, or a cylindrical member (not shown) is loosely fitted into the opening of the coil spring receiving hole 102 on the piezoelectric element side. Has also been proposed (see Patent Document 1). In the conventional example shown in FIG. 7, the extension end 103 a formed by extending the base end 103 of the coil spring 105 is engaged with a recess 101 b formed between the battery frame 101 and the circuit board 104. The end 103 is prevented from separating from the circuit board 104.
[0006]
[Patent Document 1]
JP-A-2002-215166 (pages 5-6, FIGS. 1 and 3)
[0007]
[Problems to be solved by the invention]
However, since the piezoelectric element should be subjected to film vibration, it is indispensable to leave a minimum gap G2 between the surface of the piezoelectric element and the support around the coil spring. When rotating in the direction, it is difficult to completely prevent the tip portion 106 of the coil spring 105 from being pulled or bitten as shown by the imaginary line 106a in FIG.
[0008]
The present invention has been made in view of the above points, and has as its object to provide a contact structure and an electronic timepiece provided with the same that are practically incapable of falling down even when subjected to a lateral force. To provide.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the contact structure of the present invention has a rigid conductive pin provided with a rigid main body, and a hole in which a tip side portion of the main body of the conductive pin is fitted so as to be able to enter and exit. A frame, and elastic means for applying an elastic force to the conductive pin so as to displace the conductive pin in a direction in which a distal end portion of the rigid body of the conductive pin protrudes from the hole.
[0010]
In the contact structure of the present invention, "a rigid conductive pin having a rigid main body and elastic means for displacing the conductive pin in a direction in which a tip side portion of the rigid main body of the pin protrudes from the hole" is provided. Since it is provided, the tip of the conductive pin is elastically pressed against the electrode facing the tip, and electrical contact between the conductive pin and the counter electrode is secured. Further, in the contact structure of the present invention, the “frame having a hole in which the tip side of the main body of the pin is fitted so as to be able to enter and exit” is provided. The rigid body is supported by the peripheral wall of the small-diameter hole of the frame even if a force in a direction transverse to (intersecting with) the extending direction or the extending direction of the small-diameter hole is applied. There is no fear that the camera will fall down so as to shift sideways.
[0011]
In the contact structure of the present invention, typically,
The conductive pin further includes a large-diameter locking portion that is larger in diameter than the rigid main body portion and is integrally connected to a base end portion of the main body portion, and the frame body is formed of the conductive pin. A large-diameter hole for accommodating the large-diameter locking portion, and a step connecting the large-diameter hole and the hole, the conductive pin being in contact with the large-diameter locking portion of the conductive pin. The elastic means is configured to apply an elastic force to the large-diameter locking portion of the conductive pin.
[0012]
In this case, the conductive pin which receives the elastic force by the elastic means in the direction in which the tip end portion of the rigid body protrudes from the hole, at the large-diameter locking portion, connects the large-diameter hole and the small-diameter hole of the frame. Since the protrusion of the distal end portion is restricted by contacting the stepped portion, there is no possibility that the conductive pin may fall out of the frame, or may protrude excessively.
[0013]
In the contact structure of the present invention, typically, the elastic means is made of a conductor. In this case, the elastic means cooperates with the conductive pins to serve as electrical contacts. However, if desired, a lead wire or the like may be connected to the base end of the pin separately from the elastic means.
[0014]
In the contact structure of the present invention, typically, the elastic means comprises a coil spring. In this case, a large contact pressure can be stably exerted for a long period of time. As the elastic means, a leaf spring or another spring may be used instead of the coil spring. In some cases, an elastic material such as rubber may be used.
[0015]
When the elastic means is formed of a coil spring and the rigid pin has a large-diameter locking portion, the rigid pin typically has a small-diameter shaft portion that fits into a hole of the coil spring at the base end side of the large-diameter locking portion. Have. In this case, there is little possibility that the coil spring is disengaged from the rigid pin. However, the small-diameter shaft portion may not be provided, and even in such a case, the presence of the large-diameter locking portion can reliably apply the spring force of the coil spring to the rigid conductive pin.
[0016]
In the contact structure of the present invention, typically, the distal end of the rigid main body of the conductive pin intersects with the extending direction of the small-diameter hole of the frame (lateral direction). And pressed against the movable counter electrode to secure electrical contact. However, in some cases, the counter electrode may not be movable in the cross direction (lateral direction) with respect to the frame.
[0017]
The contact structure of the present invention is typically used for a small electronic timepiece such as a wristwatch. In this case, for example, the electronic timepiece is configured such that the frame body is formed of a battery frame, and the tips of the pins are in contact with the electrodes of the piezoelectric element fixed to the back cover. Of course, instead of the electronic timepiece, an arm-mounted electronic device such as an arm-mounted portable information terminal device or another small electronic device may be used.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, some preferred embodiments of the present invention will be described based on preferred embodiments shown in the accompanying drawings.
[0019]
【Example】
1 to 3 show a wristwatch as an electronic timepiece provided with a contact structure according to a preferred embodiment of the present invention.
[0020]
As shown in FIG. 2, the main body 2 of the wristwatch 1 has a body or a case 10 having a housing recess 11 and a glass mounting opening 12, and a glass plate 13 is fitted into the glass mounting opening 12. A female screw 15 is formed in the opening 14 of the recess 11.
[0021]
The main body 2 further has a back cover 20 provided with a concave portion 22 so that the center portion becomes a thin portion 21, and the back cover 20 includes a male screw portion 24 on the outer periphery of the distal end of the cylindrical portion 23. The back cover 20 cooperates with the case 10 by means of a screwing / screwing portion T in which the male screw portion 24 is screwed to the female screw portion 15 of the case 10 to form a housing room S for a timepiece component including a movement. Has formed.
[0022]
A thin disk-shaped piezoelectric element 30 is adhered to the inner surface 25 of the disk-shaped thin portion 21 of the back cover 20 at a position shifted from the central axis C of the case 10 (see FIG. 3). The piezoelectric element 30 includes a drive electrode extending almost entirely on a main surface (front surface) 31 on the side close to the inner surface 25 of the back cover 20 and a main surface (front surface) 32 on the opposite side. As long as the electrical contact is not hindered, the surface of the electrode on the main surface 32 side may be coated with a friction reducing agent such as silicone oil. When a part of the bottom wall of the concave portion 22 of the back cover 20 becomes a thin portion that vibrates together with a piezoelectric element 30 described later instead of the entire thin wall portion 21, the position of the central axis of the thin portion is the main body portion 2. May be shifted from the central axis C. The piezoelectric element 30 attached to the thin portion 21 may not be circular.
[0023]
In the chamber S, a liquid crystal panel 4 and a circuit board 5 are provided. When the timepiece 1 is an analog timepiece, a movement including a circuit board for an analog timepiece, a time display hand, and the like are provided instead of the liquid crystal panel 4 and the circuit board 5 for a digital timepiece.
[0024]
On the back side of the circuit board 5, a battery frame 40 having a battery accommodating recess 41 and a contact terminal accommodating hole 42 is arranged, and a button-type battery 50 is arranged in the battery accommodating recess 41. As the battery 50, a battery having a maximum diameter that can be accommodated in the concave portion 11 of the case 10 is selected so that the capacity of the battery 50 is maximized, so long as the disposition of other components is not hindered. Has a diameter larger than the radius of the recess 11. As shown in FIG. 3, the substantially cylindrical battery accommodating recess 41 is formed at a position where the center axis C2 is shifted from the center axis C of the recess 11 of the case 10. The center axis C2 is also shifted from the center axis C1 of the piezoelectric element 30. The battery 50 is held in the battery accommodating recess 41 by a battery holder 51 also serving as one contact electrode terminal of the battery 50. The other electrode terminal of the battery is disposed on the bottom surface or the peripheral surface of the battery housing recess 41. Since the battery housing recess 41 has a diameter larger than the radius of the recess 11 of the case 10, the contact terminal housing hole 42 is located far away from the central axis C of the case 10.
[0025]
A gap G is formed between the surface 32 of the piezoelectric element 30 and the opposing surface 44 of the battery frame 40 so as to allow the film vibration of the piezoelectric element 30 in the A1 and A2 directions. The size of the gap G is, for example, about 0.5 mm. However, the gap G may be about 1 mm or more, and in some cases, may be smaller than about 0.5 mm. Further, the size of the gap G may be different depending on the part instead of being constant.
[0026]
As shown in FIG. 1, the contact terminal accommodating hole 42 is a pin guide hole opened at a surface 44 of the thick portion 43 around the concave portion 41 of the battery frame 40 facing the piezoelectric element 30. A small-diameter hole 45 as a part, and a large-diameter hole 46 formed coaxially with the small-diameter hole 45 and communicating with the small-diameter hole 45 at the front end of the small-diameter hole 45. A step 47 is formed at a boundary between the large hole 45 and the large diameter hole 46. The end of the large-diameter hole 46 is open at the surface 48 of the thick portion 43 of the battery frame 40 facing the circuit board 5. A contact terminal 5 a for supplying a drive signal to the piezoelectric element 30 is formed in a portion of the circuit board 5 facing the large-diameter hole 46.
[0027]
A lead terminal or a contact structure main body 60 is provided in the contact terminal receiving hole 42. The contact structure main body 60 has a rigid conductive pin 70 and a coil spring 80 as elastic means.
[0028]
The rigid conductive pin 70 includes an elongated rigid main body 71, a large-diameter locking portion or flange-like portion 72 as a spring receiving portion integrally formed on the base end side of the rigid main body 71, It has an engaging projection 73 integrally formed on the base end side of the locking portion 72.
[0029]
The rigid main body 71 includes a cylindrical main body shaft 74, a contact shaft 76 having a rounded dome-shaped tip 75 having a smaller diameter than the main body shaft 74, a main body shaft 74 and a contact shaft 76. And a connecting shaft 77 having a truncated cone shape connecting the three shafts. The three shafts 74, 76, 77 are coaxial. However, if desired, the shaft 76 may be eccentric with respect to the shaft 74.
[0030]
The main body shaft portion 74 has a diameter Dp1 that is slightly smaller than the diameter Dh1 of the small diameter hole 45 so that the small diameter hole 45 of the hole 42 can freely enter and exit. The diameter Dh1 of the small diameter hole 45 is typically about 0.5 mm to 1 mm. However, if desired, it may be smaller than about 0.5 mm or larger than about 1 mm. When the diameter Dh1 of the small diameter hole 45 is about 0.5 mm to about 1 mm, the diameter Dp1 of the main body shaft 74 is typically about 0.1 mm smaller than the diameter of the small diameter hole 45. However, the difference in diameter may be larger as long as the main body shaft 74 can be prevented from excessively tilting with respect to the small-diameter hole 45. The difference in diameter may be smaller as long as it can actually move freely.
[0031]
In addition, the length of the small-diameter hole 45 is substantially the same as the diameter. However, the small-diameter hole 45 has a diameter Dh1 of the small-diameter hole 45 and a diameter Dp1 of the main body shaft 74 so as to prevent the conductive pin 70 from being greatly inclined with respect to the central axis C3 of the small-diameter hole 45. (The size of the gap).
[0032]
The large-diameter locking portion 72 is formed of a flange or a flange-shaped large-diameter disk-shaped portion integrally formed with the base end of the main body shaft portion 74 of the rigid main body portion 71. The part 72 is also formed coaxially with the shaft parts 74, 76, 77.
[0033]
The flange-shaped portion 72 is slightly smaller than the diameter Dh2 of the large-diameter hole 46 so that the flange-shaped portion 72 can freely move in the A1 and A2 directions along the direction in which the axis C3 extends in the large-diameter hole 46 of the hole 42. It has a small diameter Dp2. The diameter Dp2 of the flange portion 72 is sufficiently larger than the diameter Dh1 of the small-diameter hole portion 45 so that the distal end side end surface 72a abuts on the end wall 47a at the step portion 47 to restrict the movement in the A1 direction. When the diameter Dp1 of the main body shaft part 45 is about 0.5 mm to about 1 mm, the diameter Dp2 of the flange-shaped part 72 is about 1 mm or slightly larger. However, it is possible to restrict the excessive tilting of the conductive pin 70 by hitting the inner wall 46a of the large-diameter hole portion 46, to reliably contact the end wall 47a of the step portion 47 to restrict the movement in the A1 direction, and to control the end of the coil spring 80. The diameter Dp2 may be smaller as long as the portion 81 can be reliably received on the end face or the main face 72b. The diameter Dp2 of the flange portion 72 and the diameter Dh2 of the large-diameter hole portion 46 may be larger as long as the coil spring 80 can be prevented from bending or meandering. The coil spring 80 is made of, for example, a stainless steel wire having a thickness of about 0.1 mm. However, the material of the spring 80 may be another material, and the wire of the spring 80 may be thicker or thinner. In particular, since the spring 80 does not reach the gap G, the thickness of the wire of the spring 80 does not matter as long as the spring 80 can reliably apply a sufficiently large contact pressure in the A1 direction.
[0034]
The engagement protrusion 73 is formed of a columnar portion having a smaller diameter than the contact shaft 76 of the rigid main body 71, and the base end thereof is chamfered. However, the diameter and shape of the coil spring 80 may be different as long as it can be easily fitted into the distal end portion 81 of the coil spring 80 to prohibit displacement of the distal end portion 81 of the coil spring 80. In the case where the coil spring 80 is deformed in a buckling manner and may be caught in the hole 46, the engagement protrusion 73 may be made longer to avoid such a possibility. If there is no possibility that the spring 80 will come off the large-diameter flange-shaped portion 72 for receiving the spring, the engaging projection 73 may not be provided.
[0035]
The coil spring 80 has a cylindrical shape, and as can be seen from FIGS. 1 and 2, one end 82 is pressed against the contact pad 5 a of the circuit board 5, and the other end 81 engages with the engaging projection 73 of the conductive pin 70. And is housed in the large-diameter hole 46 while being pressed against the annular rear surface 72b of the flange-shaped portion 72. The coil spring 80 has an outer diameter slightly smaller than the large-diameter hole 46 and is loosely fitted to the extent that large buckling-like deformation does not occur in the large-diameter hole 46, and is fitted to the engagement projection 73 of the conductive pin 70. It has an inner diameter that is sufficiently larger than the outer diameter of the engaging projection 73 so that it can be fitted easily and securely. The coil spring 80 also has an outer diameter sufficiently smaller than the flange-shaped part 72 so that it can be securely locked by the flange-shaped spring receiving part 72. However, the outer diameter of the coil spring 80 may be equal to or larger than the outer diameter of the flange-shaped portion 72 as long as there is no possibility that the flange-shaped portion 72 fits into the central hole of the cylindrical coil spring 80.
[0036]
As described above, the contact structure 8 includes the contact structure main body 60 including the conductive pins 70 and the coil springs 80, and the hole 42 of the battery frame 40 (or the peripheral wall portion of the hole 42 in the battery frame 40). .
[0037]
Next, assembling of the contact structure 8 and the like of the timepiece 1 configured as described above will be described based on FIG. 4 in addition to FIGS. 1 to 3.
[0038]
When assembling the timepiece 1 by incorporating the contact structure 8 having the above-described structure into the timepiece 1, for example, the battery frame 40 is positioned so that the main surface 48 of the battery frame 40 is located above the main surface 44. The pin 70 is assembled while being held. That is, the contact shaft 76 of the conductive pin 70 is inserted into the hole 42 of the battery frame 40 from the side of the large-diameter hole 46, and the pin 70 is dropped into the hole 42. Next, the coil spring 80 is assembled from the large-diameter hole 46 side. That is, the tip 81 of the coil spring 80 is inserted into the hole 42 from the side of the large-diameter hole 46 to drop the coil spring 80 into the hole 42. At this time, since the distal end portion 75 of the conductive pin 70 is curved and projected in a smooth convex shape, the dome-shaped distal end portion 75 is guided by the inner peripheral edge of the end wall 47 a of the step portion 47 and enters the small-diameter hole portion 45. The hole 45 protrudes through the hole 45. The conductive pin 70 stops when the surface 72 a of the flange-shaped large-diameter portion 72 contacts the end wall 47 a of the step portion 47. Also, the coil spring 80 that has fallen into the hole 42 is loosely fitted to the engaging projection 73 of the conductive pin 70 when the end face of the tip 81 contacts the back surface 72 b of the flange-shaped large-diameter portion 72 of the conductive pin 70. Is done. In this state, the end 82 of the coil spring 80 projects from the large-diameter hole 46 of the hole 42 at the main surface 48.
[0039]
With the contact structure body 60 including the conductive pins 70 and the coil springs 80 inserted into the holes 42 of the battery frame 40, the end 82 of the coil spring 80 is then pushed into the holes 46 so that The circuit boards 5 are placed on the surface 48 and fixed to each other. In this fixing, other components such as the liquid crystal panel 4 can be simultaneously fixed to each other as desired. When the circuit board 5 is fixed to the battery frame 40, the main surface 5 b of the circuit board 5 is in close contact with the main surface 48 of the battery frame 40, and the electrode pad 5 a of the circuit board 5 faces the hole 42. It is positioned at the site and pressed against the end 82 of the coil spring 80. At this time, the coil spring 80 is pressed in the A1 direction by the circuit board 5 to be compressed and deformed, and the conductive pin 70 is pressed in the A1 direction by pressing the surface 72a of the flange-shaped portion 72 against the end surface 47a of the step portion 47 of the hole 42. The small diameter contact shaft 76 of the conductive pin 70 is kept in a state of protruding from the main surface 44 of the frame 40.
[0040]
Next, the timepiece body portion including the liquid crystal panel 4, the circuit board 5, the battery frame 40, and the like is placed in the concave portion 11 of the case 10, and finally, the back cover 20 to which the piezoelectric element 30 is attached is attached to the case 10. Screw it in. As the male screw part 24 of the back cover 20 and the female screw part 15 of the case 10 are screwed together, the electrode on the inner surface 32 of the piezoelectric element 30 is brought into contact with the dome-shaped tip part 75 of the contact shaft part 76 of the conductive pin 70. In contact therewith, the conductive pin 70 is pushed in the direction A2 against the spring force in the direction A1 of the coil spring 80 while sliding in the direction B1 with respect to the dome-shaped tip portion 75.
[0041]
At this time, as shown in FIG. 4, the distal end portion 75 of the contact shaft portion 76 of the conductive pin 70 is pulled in the B1 direction by the frictional force. As a result, the conductive pin 70 is tilted in the direction F1 in the hole 42, but since the conductive pin 70 has rigidity, the distal end 74a of the main body shaft 74 of the rigid main body 71 is And the base end 72c of the flange portion 72 of the conductive pin 70 abuts one side 46b of the peripheral wall 46a of the large diameter hole 46. Since the conductive pins 70 are supported by the peripheral walls 45 b and 46 b, the contact pins 76 of the conductive pins 70 enter the gap G between the surface 32 of the piezoelectric element 30 and the facing surface 44 of the battery frame 40, and the screw of the back cover 20 is screwed. There is no risk of hindering the insertion and tightening or damaging the piezoelectric element 30. The hole 45 is relatively long, and before the flange-shaped receiving portion 72 hits the peripheral wall 46 b of the large-diameter hole 46, the base end portion of the main body shaft portion 74 becomes the base end or the stepped portion of the small-diameter hole 45. The tilt of the conductive pin 70 may be restricted by hitting the inner peripheral edge of 47. In any case, even if the coil spring 80 does not have the extended end 103a like the coil spring 105 in FIG. 7, there is no possibility that the coil spring 80 is pulled in the A1 direction. Electrical contact with the electrode portion 5a of the substrate 5 can be ensured.
[0042]
In the above, the tip end portion 75 of the contact shaft portion 76 of the conductive pin 70 has a corner portion which is not actually caught in the frictional engagement state when the back cover 20 is closed in the B1 direction or opened in the B2 direction. , A plane perpendicular to the central axis C4. However, in that case, it is preferable that the corner is chamfered, and it is more preferable that the chamfer is round. When the conductive pin 70 is inserted into the large-diameter hole 46 of the hole 42 and dropped, the tip 75 of the conductive pin 70 moves in the extending direction of the hole 42. It suffices if the front end portion 75 can be prevented from being obliquely caught on the end wall 47a of the step portion 47. Therefore, when the front end portion 75 of the conductive pin 70 has a flat portion perpendicular to the central axis C4, the end wall or the end surface 47a of the step portion 47 is preferably formed in an annular shape perpendicular to the central axis C3. Instead of being a flat surface, it is preferable to adopt a form of a truncated conical peripheral surface that is inclined so as to have a smaller diameter as it approaches the small diameter hole 45. Also, one or both of the large-diameter hole portion 46 and the small-diameter hole portion 45 do not have a columnar shape with a constant diameter (a cylindrical shape in terms of the peripheral surface), but have a smaller diameter toward the back cover. The shape may be a truncated cone. In this case, it is preferable that the shaft portion 74 of the conductive pin 70 also has a truncated conical shape that is thinner toward the tip.
[0043]
Although the example in which the conductive pins 70 are inserted from the main surface 48 side of the battery frame 40 has been described above, for example, a through hole having the same diameter as the large-diameter hole portion 46 is formed in the battery frame 40. When the cylindrical spacer is fitted into the hole from the main surface 44 side to form a small-diameter hole by the central hole of the cylindrical spacer, the coil spring 80 and the conductive pin 70 are mainly inserted into the through hole. After insertion from the surface 44 side, a cylindrical spacer may be fitted from the main surface 44 side to incorporate the contact structure main body 60.
[0044]
In the above description, an example in which the elastic means is a coil spring has been described, but the elastic means may be another spring such as a leaf spring instead of the coil spring, and in some cases, may be an elastic material such as rubber. You may.
[0045]
FIG. 5 shows a contact structure provided with a leaf spring as the elastic means. In the example of FIG. 5, the same or similar members as those in the examples shown in FIGS. 1 to 4 are denoted by the same reference numerals, and partially different members are denoted by the same reference numerals followed by the reference numeral “h”. Have been.
[0046]
The contact structure 8h illustrated in FIG. 5 includes a contact structure main body 60h including a conductive pin 70h and a leaf spring 90, and a frame 40h including a hole 42h.
[0047]
The conductive pin 70h is the same as the conductive pin 70 shown in FIGS. 1 to 4 except that the entire surface of the end surface 72bh of the flange-shaped portion 72h is flat without the engagement protrusion 73 on the base end side. It has various shapes and structures.
[0048]
The hole 42h of the battery frame 40 is the same as that of FIG. 1 except that the large-diameter hole 46 is a short hole 46h and that the large-diameter hole 46h has a larger spring receiving recess 49 on the base end side. It has the same shape and structure as the hole 42 shown in FIG.
[0049]
The circuit board 5h has a spring receiving opening 5b at a position corresponding to the hole 42h, and has a connection terminal 5ah on one side of the opening 5b, except that the circuit shown in FIGS. It has the same shape and structure as the substrate 5.
[0050]
The leaf spring 90 has a linear or planar base 91, a sloping portion 93 extending obliquely from the tip 92 of the base 91, and a pressing in a “U” shape at the tip of the sloping portion 93. The end portion 94 is fixed to the circuit board 5 h at the base end portion 95 of the base portion 91 and is electrically connected to the connection terminal portion 5 ah. The skew portion 93 extends into the opening 5 b and the concave portion 49 and is pressed. The end portion 94 exerts a spring force in the A1 direction on the end surface 72bh of the flange portion 72h of the conductive pin 70h at the convex curved portion 96.
[0051]
As shown in FIG. 5, when the back cover 20 is attached to a predetermined position and the gap G between the piezoelectric element 30 on the inner surface of the back cover 20 and the battery frame 40 is reduced to some extent, the spring 90 is set to the predetermined position. As long as the tip 75 of the conductive pin 70h can be pressed against the piezoelectric element 30 by the spring force and the conductive pin 70h can be prevented from being detached from the hole 42h, for example, with the back cover 20 removed, The spring force may not be applied to the conductive pin 70h.
[0052]
In the contact structure 8h configured as described above, the rigid main body 71 of the conductive pin 70h is substantially the same as the rigid main body 71 of the conductive pin 70 of the contact structure 8 shown in FIGS. Contact structure 8h, the contact structure 8h exerts a force in the B1 and B2 directions on the distal end portion 75 of the conductive pin 70h as the back cover 20 opens and closes in the B1 and B2 directions, similarly to the contact structure 8. Even if the contact is applied, the electrical contact can be stably secured without the contact being displaced or damaged.
[0053]
At the time of assembling, mounting the circuit board 5h of the battery frame 40h after inserting the conductive pins 70h into the holes 42h is the same as the case of the example shown in FIGS. For example, when the leaf spring 90 is assembled to the circuit board 5h after the battery frame 40h and the circuit board 5h are fixed, naturally, the conductive pins 70h are fixed after the battery frame 40h and the circuit board 5h are fixed. May be arranged in the hole 42h.
[0054]
In the example shown in FIG. 5, the base 91 of the leaf spring 90 is attached to the surface of the circuit board 5 h opposite to the battery frame 40, but is attached to the surface in contact with the battery frame 40. It may be.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional explanatory view of a contact structure according to a preferred embodiment of the present invention.
FIG. 2 is an explanatory sectional view of a wristwatch provided with the contact structure of FIG. 1;
FIG. 3 is an explanatory plan view showing a relative arrangement such as a rotation center position of members related to a contact structure in the wristwatch of FIG. 2;
FIG. 4 is a cross-sectional explanatory view similar to FIG. 1, showing movement of conductive pins in connection with screwing of a back cover in the contact structure of FIG. 1;
FIG. 5 is an explanatory sectional view similar to FIG. 1 of a contact structure according to a modification of the present invention.
FIG. 6 is an explanatory sectional view similar to FIG. 1 of a conventional contact structure.
FIG. 7 is an explanatory sectional view similar to FIG. 1 of another conventional contact structure.
[Explanation of symbols]
1 clock
2 Clock body
5,5h circuit board
8.8h Contact structure
20 back cover
30 Piezoelectric element
40,40h Battery frame
42, 42h hole
45 Small hole
46,46h Large diameter hole
47 Step
49 recess
50 batteries
60, 60h Contact structure body
70, 70h conductive pin
71 Rigid body
72 Flange-shaped part (Large-diameter locking part)
73 Engagement projection
74 Body shaft
75 Tip
76 Contact shaft
80 coil spring
90 leaf spring

Claims (8)

A rigid conductive pin having a rigid body,
A frame having a hole in which a tip side portion of the main body of the conductive pin is fitted so as to be able to enter and exit,
A contact structure having elastic means for applying an elastic force to the conductive pin so as to displace the conductive pin in a direction in which a distal end portion of the rigid body of the conductive pin projects from the hole. The conductive pin further has a large-diameter locking portion that is larger in diameter than the rigid main body portion and is integrally connected to a base end portion of the main body portion,
The frame body is a large-diameter hole for accommodating the large-diameter locking portion of the conductive pin, and a step portion connecting the large-diameter hole and the hole, wherein the large-diameter coupling portion of the conductive pin is provided. Having a contact portion with a stopper to regulate the protrusion of the tip side portion of the conductive pin,
The contact structure according to claim 1, wherein the elastic means is configured to exert an elastic force on the large-diameter locking portion of the conductive pin. 3. The contact structure according to claim 1, wherein said elastic means comprises a coil spring. The contact structure according to claim 3, wherein the rigid pin has a small-diameter shaft portion that fits into a hole of the coil spring on a base end side of the large-diameter locking portion. The contact structure according to claim 1, wherein the elastic means comprises a leaf spring. The contact structure according to any one of claims 1 to 5, wherein the elastic means is made of a conductor. The distal end of the rigid main body of the conductive pin is pressed against a movable counter electrode with respect to the frame in a direction intersecting the extending direction of the small-diameter hole of the frame to ensure electrical contact. The contact structure according to any one of claims 1 to 6. The frame according to any one of claims 1 to 7, wherein the frame is formed of a battery frame, and a distal end of the rigid body of the conductive pin is configured to contact a facing electrode of a piezoelectric element fixed to a back cover. An electronic timepiece provided with the contact structure according to one of the above aspects.

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