JP6323363B2 - Electronic clock - Google Patents

Description

  The present invention relates to an electronic timepiece.

In wristwatches, in order to achieve both cost reduction and design variation increase, multiple types of watches with different sizes and designs can be configured by incorporating the basic common movement into watch cases of various sizes and designs. It is considered to be.
By the way, in order to prevent electric charges from being charged due to static electricity or the like, the electronic timepiece is provided with a conduction spring that conducts the earth terminal (plus electrode) of the movement and the inner wall of the case case (for example, a patent) References 3, 5).
In Patent Document 1, an elastic member restricting portion for setting a bending amount of the conduction spring is provided in an inner frame housed in the case together with the movement. Thereby, the bending amount of the conduction spring is changed, and the conduction spring can be conducted to cases having different inner diameter dimensions.

JP 2009-250913 A

However, in the said patent document 1, since the elastic member control part is made to contact | abut to a conduction spring and the bending amount is changed, there exists a restriction | limiting in the change range of bending amount. For this reason, there is a restriction on the case size in which the conduction spring can be contacted by changing the deflection amount. For example, in the case of a case having a larger inner diameter than the conventional case, the connection spring is brought into contact with the inner wall of the case. Sometimes it was difficult.
Further, since the amount of deflection of the conduction spring changes, depending on the inner diameter of the case, the contact state between the conduction spring and the case may become unstable, and the countermeasure against static electricity may also become unstable.

  It is an object of the present invention to provide an electronic timepiece that can use a common movement in electronic timepieces having different case sizes and can reliably connect the ground terminal of the movement and the case.

  The electronic timepiece of the present invention has a metal case, a movement housed in the case, a non-conductive guide member for guiding the movement into the case, and a spring property provided in the movement. It is provided with the earthing terminal and the electroconductive conduction | electrical_connection pin which is provided in the said guide member and contacts the said earthing terminal and a case.

According to the present invention, the movement is guided to the metal case using a non-conductive guide member such as a synthetic resin. Here, the guide member is, for example, an inner frame or a dial receiving ring. The guide member is provided with a conduction pin, and this conduction pin contacts the earth terminal and the case of the movement, so that the earth terminal conducts to the metal case via the conduction pin.
For this reason, when a plurality of types of electronic timepieces having different case sizes are configured using a common movement, it is possible to cope by changing only the guide member and the conduction pin according to the case size. Therefore, the contact state between the ground terminal and the conductive pin can be made constant regardless of the case size, and the contact state between the conductive pin and the case can be made constant regardless of the case size, so that a stable countermeasure against static electricity can be taken.

  In the electronic timepiece of the invention, the guide member is formed with a through hole along the radial direction, and the conduction pin is inserted through the through hole of the guide member and arranged to be movable along the radial direction. It is preferable that a base end portion positioned on the inner peripheral side of the guide member is in contact with the ground terminal, and a tip end portion positioned on the outer peripheral side of the guide member is in contact with the case.

Since it is only necessary to form a through hole in the guide member and insert a conduction pin into the through hole, the structure of the guide member and the conduction pin can be simplified and provided at low cost. Furthermore, since the guide member and the conduction pin can be managed as a part in a state where the conduction pin is inserted into the through-hole, when the common movement is used, the guide member and the conduction pin designed to the dimensions according to the case size, Management work becomes easier compared to the case of individual management.
In addition, since the conduction pin is movably disposed along the radial direction of the guide member and the tip of the conduction pin is in contact with the case, the conduction pin can be in contact with any place on the inner peripheral surface of the case, The degree of freedom of the arrangement position of the conductive pin can be increased.

  In the electronic timepiece of the invention, when the conductive pin is disposed between the case and the ground terminal, the displacement amount of the ground terminal is set to be equal to or less than an allowable deflection amount of the ground terminal, and the conductive pin is It is preferable that the case is urged by the ground terminal and contacts the case.

For example, by setting the difference between the dimension between the ground terminal and the case in a state where the conductive pin is not disposed and the length dimension of the conductive pin to be equal to or less than the allowable deflection amount of the ground terminal, the conductive pin is set to the case and When arranged and brought into contact between the ground terminals, the displacement amount of the ground terminal can be set to be equal to or less than the allowable deflection amount of the ground terminal.
And if it sets in this way, a conduction | electrical_connection pin can be urged | biased by the case with the spring force of a ground terminal, and can be made to contact a case with predetermined | prescribed urging | biasing force. Therefore, the ground terminal and the conduction pin can be reliably and stably brought into contact with each other. Furthermore, since the conducting pin is urged by the spring force of the ground terminal and is brought into contact with the case, it is not necessary to separately provide a spring for urging the conducting pin, and the number of parts can be reduced.

In the electronic timepiece of the invention, it is preferable that a window capable of confirming a contact state between the conduction pin and the ground terminal is formed on the guide member.
According to such a configuration, the contact state between the conduction pin and the ground terminal can be easily confirmed from the window formed in the guide member. For this reason, if the contact state between the conductive pin and the ground terminal is unstable, the contact state can be restored to a stable state, and a stable countermeasure against static electricity can be taken.

The front view which shows the electronic timepiece of embodiment of this invention. The expanded sectional view which shows the conduction | electrical_connection structure using the conduction | electrical_connection pin of the said electronic timepiece. The top view which shows the dial plate receiving ring of the said electronic timepiece. The disassembled perspective view of the principal part of the said electronic timepiece.

Hereinafter, an electronic timepiece (watch) 1 according to an embodiment of the present invention will be described with reference to FIGS.
The electronic timepiece 1 includes an exterior case 2 that houses a movement or the like to be described later. The exterior case 2 includes a case main body (body) 3 and a back cover 4.
A cover glass 5 is attached to the opening on the surface side of the case body 3.

A disc-shaped back cover 4 that closes the opening on the back side of the case body 3 is attached to the back side of the case body 3.
The back cover 4 includes a ring-shaped frame 13 and a back cover glass 14 that is a translucent member press-fitted into the frame 13 via a packing.
In the present embodiment, the case main body 3 and the back cover 4 are configured separately, but the present invention is not limited to this, and a one-piece case in which the case main body 3 and the back cover 4 are integrated may be used.
A metal material such as BS (brass), SUS (stainless steel), or titanium alloy is used for the case body 3 and the frame 13 of the back cover 4.

[Internal structure of electronic watch]
Next, the internal structure built in the exterior case 2 of the electronic timepiece 1 will be described.
As shown in FIGS. 2 to 4, a movement 6, a dial receiving ring 70 that is a guide member, a dial 15, and a dial ring 16 are accommodated in the outer case 2.

[Movement]
As the movement 6, those conventionally used for watches can be used. The movement 6 of this embodiment includes a main plate, a step motor, a train wheel, a battery, and the like, and drives a pointer. For example, in the electronic timepiece 1 shown in FIG. 1, the movement 6 drives an hour hand 21, a minute hand 22, and a second hand 23 with the plane center position of the dial 15 as a rotation axis.
In addition, the movement 6 of the present embodiment includes a generator that generates electricity by rotation of the rotary weight 62, a secondary battery that charges the generated power of the generator, and a motor that is driven by the power of the secondary battery. It is a movement.

The movement 6 may be a movement for a general quartz watch in which a step motor is driven by a button-type primary battery, or a generator that generates electricity using a mainspring as a driving source, and the generated power of the generator is charged. The movement may include a secondary battery and a motor driven by the power of the secondary battery.
Further, the layout, number, type, and the like of each pointer are not limited to those shown in FIG. Furthermore, a calendar car such as a date wheel or day wheel may be provided separately.

[Dial plate ring]
The dial receiving ring 70 of the present embodiment is made of a synthetic resin such as polyacetal resin, and constitutes a guide member that guides the movement 6 into the outer case 2.
As shown in FIGS. 3 and 4, the dial receiving ring 70 holds an upper surface portion 71 formed in an annular shape, a ring spring portion 72 extended from the upper surface portion 71 to the back cover 4 side, and the movement 6. And a hook portion 74.
Two recesses 711 are formed in the upper surface portion 71, and a ring surface side abutting portion 712 that protrudes to the surface side, that is, the dial plate 15 side is formed between the recesses 711.
The recess 711 is a dial removing groove used when the dial 15 is removed from the base plate of the movement 6. The ring surface side contact portion 712 is a portion that contacts the back surface of the dial plate 15 and receives the dial plate 15.

  Four ring spring portions 72 are formed in the circumferential direction of the upper surface portion 71. Each ring spring portion 72 includes two column portions 721 that are continuous from the upper surface portion 71, and a beam portion 722 that spans between these column portions 721. A push-up projection 723 is formed on the bottom surface at the intermediate position of the beam portion 722. Since the surface side of the beam portion 722 is a space, when a force toward the upper surface portion 71 is applied to the push-up projection 723, the beam portion 722 is bent toward the upper surface portion 71 side, and the dial plate is received by the spring force. The ring 70 is urged toward the dial plate 15 side.

On the bottom surface (lower surface) of the ring spring portion 72, a backlash prevention projection 725 is formed which contacts the back cover 4 and prevents the dial receiving ring 70 from “rattle” in the height direction.
Two backlash prevention projections 725 provided on the ring spring portion 72 are formed on the lower surface of the beam portion 722, and a push-up projection 723 is formed therebetween.

  The hook portion 74 is mainly disposed on the inner peripheral side of the column portion 721 of the ring spring portion 72. The movement 6 is attached to the inner peripheral side of the dial receiving ring 70 by the hook portion 74.

A plurality of rattle prevention protrusions 75 are formed on the outer peripheral surface of the dial receiving ring 70. When the dial receiving ring 70 is arranged in the case main body 3, the backlash preventing projection 75 comes into contact with the inner wall of the case main body 3 to prevent the dial receiving ring 70 from rattling in the plane direction with respect to the case main body 3. Yes.
Therefore, the dial receiving ring 70 constitutes a non-conductive guide member that guides the movement 6 into the outer case 2. In the present embodiment, the middle frame is not used, but the middle member may be used as a guide member. Furthermore, you may comprise a guide member with both the dial receiving ring 70 and an inner frame.

The dial receiving ring 70 is formed with a through hole 73 into which a conductive pin 80 described later is inserted. The through hole 73 is formed along the radial direction of the dial receiving ring 70. In this embodiment, in the front view of FIGS. 1 and 3, the electronic timepiece 1 is formed at a position approximately 11 o'clock from the center position of the dial 15.
A window 713 is formed on the upper surface portion 71 of the dial receiving ring 70 so that a contact state between a conduction pin 80 inserted through the through hole 73 and a ground terminal 65 described later can be confirmed.
A concave groove in which a shaft of the crown 30 and a winding stem (not shown) are arranged is formed in the 3 o'clock direction of the dial receiving ring 70, and the button 31 of the button 31 is arranged in the 2 o'clock direction of the dial receiving ring 70. A through hole in which the shaft is disposed is formed.

[Dial plate]
The dial plate 15 is formed of a metal material such as stainless steel or a plate material such as plastic, and is attached to the surface side of the movement 6 by press-fitting a foot (not shown) protruding from the bottom surface into the base plate of the movement 6. . At this time, the height position of the dial 15 with respect to the movement 6 is defined by contacting the dial receiving ring 70.
A dial ring 16 is disposed on the outer peripheral edge of the dial 15 surface. The upper surface of the dial ring 16 is positioned in contact with the case body 3.

[Conduction structure]
Next, a conduction structure provided as a countermeasure against static electricity of the electronic timepiece 1 will be described.
As shown in FIG. 2, the movement 6 is provided with a ground terminal 65 having a spring property. The ground terminal 65 is formed by bending a metal plate, and the contact surface moves when a load is applied to the contact surface, and an allowable deflection amount (spring stroke range) at which an appropriate contact pressure is obtained is set.
A conduction pin 80 is inserted into the through hole 73 of the dial receiving ring 70. As shown in FIG. 2, the inner diameter of the through-hole 73 is a constant size from the outer periphery to the vicinity of the inner periphery, but the inner diameter gradually increases from the vicinity of the inner periphery toward the inner periphery. It is made small and tapered. Therefore, a locking portion 731 that protrudes into the through hole 73 is formed on the inner peripheral edge of the through hole 73.

The conduction pin 80 is formed in a substantially cylindrical shape, and the tip 81 that is one end is formed in a substantially hemispherical shape. A small diameter portion 82 having a diameter smaller than the diameter of the distal end portion 81 is formed between an intermediate portion of the conduction pin 80 and a base end portion (rear end portion) 83 which is the other end portion. The diameter of the small diameter portion 82 is made smaller than the inner diameter of the engaging portion 731 portion of the through hole 73. Further, the base end portion 83 of the conduction pin 80 has the same diameter as the tip end portion 81, and the outer peripheral portion of the end surface facing the ground terminal 65 is an inclined surface.
Here, the axial length dimension L1 of the conductive pin 80 is the distance between the ground terminal 65 (indicated by a two-dot chain line in FIG. 2) and the inner wall of the case body 3 when the conductive pin 80 is not disposed. The length L2 is set longer than the dimension L2, and the difference L3 = L1−L2 is set to be equal to or less than the allowable deflection amount of the ground terminal 65.
For this reason, as shown in FIG. 2, when the conduction pin 80 is disposed between the inner wall of the case body 3 (exterior case 2) and the ground terminal 65, the displacement L2 of the ground terminal 65 is the ground terminal 65. Less than the allowable deflection amount. Therefore, the conduction pin 80 is urged toward the inner wall side of the case main body 3 by the spring force of the ground terminal 65, contacts the case main body 3 and the ground terminal 65 with a predetermined contact pressure, and can maintain a stable conductive state.

As described above, the length dimension L <b> 1 of the conduction pin 80 needs to be set according to the distance dimension between the ground terminal 65 of the movement 6 and the inner wall of the case body 3. That is, when the common movement 6 is incorporated into a plurality of types of case main bodies 3 having different inner diameter dimensions, the dial receiving ring in which the diameter of the upper surface portion 71 is set according to the distance between the case main body 3 and the movement 6. 70 is prepared. Then, the length dimension L1 of the conductive pin 80 may be set in accordance with the size of each dial receiving ring 70.
In the case of the electronic timepiece 1 having a small inner diameter of the case main body 3, the ground terminal 65 may be brought into direct contact with the inner wall of the case main body 3. That is, when the gap between the movement 6 and the inner wall of the case body 3 is small as in the case of the small case 2, the ground terminal 65 can be brought into direct contact with the inner wall of the case body 3.

  For this reason, it is preferable in terms of component management that the conduction pin 80 is attached to the dial receiving ring 70 in advance. The operation of incorporating the conductive pin 80 into the dial receiving ring 70 is as follows. When the conducting pin 80 is pushed in from the outer peripheral side of the through hole 73, the inclined surface of the base end portion 83 of the conducting pin 80 and the tapered surface of the locking portion 731 come into contact with each other, and the locking portion 731 is elastically deformed and spreads. The base end 83 gets over. For this reason, the conduction pin 80 is attached so as to be movable in the radial direction of the dial receiving ring 70 in a range in which the locking portion 731 is located in the small diameter portion 82. That is, the conductive pin 80 attached to the dial receiving ring 70 is not dropped from the dial receiving ring 70 when the electronic timepiece 1 is assembled, and the dial receiving ring 70 and the conductive pin 80 can be managed together. .

When the movement 6 is attached to the dial receiving ring 70, the ground terminal 65 contacts the conductive pin 80, and the conductive pin 80 is biased by the spring force of the ground terminal 65 and moves to the outer peripheral side of the dial receiving ring 70. .
When the dial receiving ring 70 to which the movement 6 is attached is incorporated into the case body 3, the tip 81 of the conduction pin 80 comes into contact with the inner wall (inner peripheral surface) of the case body 3. For this reason, the conduction pin 80 is pushed to the movement 6 side, and a load is applied to the ground terminal 65 to deform it. For this reason, the conduction pin 80 can be brought into contact with the ground terminal 65 and the case main body 3 with a predetermined contact pressure by the spring force of the ground terminal 65, thereby providing a stable conductive structure for countermeasures against static electricity.

[Operational effects of this embodiment]
Since the ground terminal 65 provided in the movement 6 is not in direct contact with the case body 3 but through the conductive pin 80, a plurality of types of electronic timepieces having different case sizes using the common movement 6 are used. 1 can be accommodated by changing only the dial receiving ring 70 and the conduction pin 80 according to the case size. Therefore, the contact state between the ground terminal 65 and the conduction pin 80 can be made constant regardless of the case size, and the contact state between the conduction pin 80 and the case body 3 can also be made constant regardless of the case size. Thus, the ground terminal 65 can be reliably conducted through the metal case body 3 and a stable countermeasure against static electricity can be taken.

A through hole 73 is formed in the dial receiving ring 70 along the radial direction, and the conductive pin 80 is inserted through the through hole 73. Therefore, the structure of the dial receiving ring 70 and the conductive pin 80 can be simplified. Can be provided at low cost.
Moreover, it can manage as a component in the state which attached the conduction | electrical_connection pin 80 to the dial receiving ring 70, and management work becomes easy.
Further, since the conductive pin 80 is movably disposed along the radial direction of the dial receiving ring 70 and the tip 81 of the conductive pin 80 is in contact with the inner wall of the case body 3, the position of the conductive pin 80 is determined. The degree of freedom is high and can be designed easily. That is, since the conducting pin 80 may be brought into contact with any one of the entire inner peripheral surface of the case body 3, the degree of freedom in arranging the conducting pin 80 can be increased.
Further, when the conductive pin 80 is brought into contact with the back cover 4, the conductive pin 80 must be brought into contact with the metal frame 13 while avoiding the rotary weight 62 and the back cover glass 14. In the embodiment, since the conduction pin 80 is in contact with the inner wall of the case body 3, the conduction pin 80 can be easily disposed and can be reliably brought into contact with the case 2.

  By appropriately setting the dimension L1 of the conductive pin 80 and the dimension L2 between the case main body 3 and the ground terminal 65, the amount of bending (spring stroke) L3 of the ground terminal 65 becomes equal to or less than the allowable amount of bending of the ground terminal 65. Can be set as follows. For this reason, the conduction pin 80 can be urged by the spring force of the ground terminal 65 and brought into contact with the inner wall of the case body 3 with a predetermined urging force. Therefore, the ground terminal 65 and the conduction pin 80 can be brought into contact with each other reliably and stably, and it is not necessary to provide another spring for biasing the conduction pin 80, and the number of parts can be reduced.

  Since the window 713 capable of confirming the contact state between the conductive pin 80 and the ground terminal 65 is formed in the dial receiving ring 70, the contact state between the conductive pin 80 and the ground terminal 65 can be easily confirmed. For this reason, if the contact state between the conductive pin 80 and the ground terminal 65 is unstable, the contact state can be restored to a stable state, and a stable countermeasure against static electricity can be taken.

In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.
For example, in the above embodiment, the window 713 is not necessarily provided. For example, when the design is such that the contact state of the conduction pin 80 and the ground terminal 65 can be confirmed from the back side of the movement 6 and the dial receiving ring 70, the window 713 does not need to be provided.

A spring that urges the conduction pin 80 toward the case body 3 may be provided separately. Further, the shape of the conductive pin 80 is not limited to that of the above embodiment. Furthermore, the number of conductive pins 80 is not limited to one, and a plurality of conductive pins 80 may be arranged. In this case, it is preferable that the interval between the conductive pins 80 along the inner peripheral surface of the case body 3 is equal. For example, when two conductive pins 80 are arranged, it is preferable to arrange them at an interval of 180 degrees, that is, at positions facing each other across the movement 6, and when three conductive pins 80 are arranged, they are arranged at intervals of 120 degrees. It is preferable to do.
In the embodiment, the conductive pin 80 is disposed on the dial receiving ring 70. However, when the middle frame is provided, the conduction pin 80 may be disposed on the middle frame. Furthermore, the conduction pin 80 is not limited to the contact with the inner wall of the case body 3, and may be brought into contact with the metal back cover 4.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 2 ... Exterior case, 3 ... Case main body, 4 ... Back cover, 6 ... Movement, 15 ... Dial, 65 ... Ground terminal, 70 ... Dial receiving ring, 73 ... Through-hole, 80 ... Conduction pin , 81 ... distal end part, 82 ... small diameter part, 83 ... proximal end part, 713 ... window.

Claims (4)

A metal case,
A movement housed in the case;
A non-conductive guide member for guiding the movement into the case;
A grounding terminal provided in the movement and having a spring property;
An electronic timepiece comprising: a conductive conduction pin provided on the guide member and in contact with the ground terminal and the case. The electronic timepiece according to claim 1,
A through hole is formed in the guide member along the radial direction,
The conduction pin is inserted through the through hole of the guide member and is arranged to be movable along the radial direction.
A base end located on the inner peripheral side of the guide member is in contact with the ground terminal,
An electronic timepiece characterized in that a tip portion located on the outer peripheral side of the guide member contacts the case. The electronic timepiece according to claim 1 or 2,
When the conductive pin is disposed between the case and the ground terminal, the displacement amount of the ground terminal is set to be equal to or less than an allowable deflection amount of the ground terminal,
The electronic timepiece characterized in that the conductive pin is urged by the ground terminal and contacts the case. The electronic timepiece according to any one of claims 1 to 3,
The electronic timepiece is characterized in that the guide member is formed with a window capable of confirming a contact state between the conductive pin and the ground terminal.

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