JP2007274373A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of reducing a hit phenomenon caused by a shock. <P>SOLUTION: A battery pack loading part 15 to which a battery pack 2 is freely removably loaded, comprises a positive power supply connecting terminal 4 connected to a positive pole terminal of the battery pack 2 and a negative power supply connecting terminal 5 connected to a negative pole terminal thereof and the positive power supply connecting terminal 4 and the negative power supply connecting terminal 5 comprises, respectively, at least two or more contact parts 41A, 41B and 51A, 51B pressed in contact with the positive pole terminal and the negative pole terminal by energizing forces. Spring constants of the contact parts 41A, 41B of the positive power supply connecting terminal 4 and the contact parts 51A, 51B of the negative power supply connecting terminal 5 are then different from each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides an electronic apparatus comprising a battery pack mounting portion to which a battery pack is detachably mounted, a positive power connection terminal connected to a positive terminal of the battery pack, and a negative power connection terminal connected to a negative terminal About.

Conventionally, in an electronic device such as a mobile phone, the battery pack is detachably mounted on a mounting portion formed on a back case or the like of a casing of the electronic device. Specifically, positive and negative power connection terminals (connection connectors) that are surface-mounted with solder on a printed circuit board are exposed in the mounting portion, and the battery pack electrodes are provided on the power connection terminals. The battery pack is attached to the back case by engaging and disposing the battery pack on the mounting portion from above so as to contact each other.
And in such an electronic device, there is also one in which each of the positive and negative power supply connection terminals has a double contact structure provided with two spring-like contact portions that contact each electrode of the battery pack (for example, Patent Document 1).
JP 2001-76782 A

The double contact structure is effective for stabilizing the impedance, but since the contact part and the electrode are mechanically connected, if the spring constant of the contact part is the same, the response due to external impact Therefore, a so-called instantaneous interruption phenomenon may occur in which the contact point with the electrode is instantaneously opened.
This invention is made | formed in view of the said situation, and it aims at providing the electronic device which can reduce the instantaneous interruption phenomenon with respect to an impact.

In order to solve the above-mentioned problem, the invention of claim 1 is connected to a positive power supply connection terminal and a negative electrode terminal connected to a positive terminal of the battery pack in a battery pack mounting part in which the battery pack is detachably mounted. A negative power supply connection terminal,
In the battery pack mounted state, the positive power connection terminal includes the positive terminal, the negative power connection terminal includes the negative terminal, and includes at least two contact portions that are pressed by an urging force.
In these positive power supply connection terminals and negative power supply connection terminals, the spring constants of the contact portions are different from each other.

  According to the first aspect of the present invention, the positive power source connection terminal is provided with the positive electrode terminal, the negative power source connection terminal is provided with at least two or more contact portions that are pressed against the negative electrode terminal by an urging force, and the spring constant between the contact portions is provided. Are different from each other, and when an external impact is applied, the response to the impact of each contact portion of the positive power connection terminal changes, so that the contact portions are simultaneously opened from the pressure contact state with the positive electrode terminal. This can be reduced. Similarly, it is possible to reduce the contact portions of the negative power supply connection terminals from being simultaneously opened from the negative electrode terminal. As a result, occurrence of instantaneous interruption phenomenon can be reduced.

The invention of claim 2 is the electronic device according to claim 1,
The contact portions having different spring constants are characterized in that one spring constant is 30% or less of the other spring constant.

  According to the second aspect of the present invention, both the impact and the phase are reduced by half with respect to the response of the contact portion showing the reference spring constant, and the occurrence of the instantaneous interruption phenomenon can be more effectively reduced.

  According to the present invention, it is possible to reduce the instantaneous interruption phenomenon between the electrode terminal of the battery pack and the power supply connection terminal by changing the responsiveness of the contact portion with respect to the impact.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in this embodiment, a mobile phone 100 is described as an example of an electronic device.
FIG. 1 is an exploded perspective view of the mobile phone 100 as viewed from the back side, and FIG. 2 is a perspective view of the battery pack 2.
The cellular phone 100 has a housing 1 formed by combining an upper case 11 and a lower case 12, and a circuit board (not shown) for mounting an internal circuit is accommodated in the housing 1.
The upper case 11 is a well-known substantially box-like shape, and is provided with an input key and a display panel (not shown). On the other hand, the lower case 12 is also a well-known box-like one, and an antenna 13 that is electrically connected to the circuit board is mounted on the upper end portion, and a notification speaker 14 is provided on the upper side of the back surface of the lower case 12. In addition, a battery pack mounting portion 15 that houses the battery pack 2 is formed in the lower half of the back surface. The battery pack mounting portion 15 is a recess formed in a substantially rectangular shape in plan view, and a power connection connector (power connection terminal portion) 3 is provided at the center on the lower wall surface 15a forming the recess. A locking hole 16 for locking locking claws 26 and 26 of the battery pack 2 to be described later is formed in the portion. Further, the height of the left and right side wall surfaces 15b, 15b forming the recesses is lower than the height of the upper and lower wall surfaces 15a, 15c by the thickness of the lid portion 22 of the battery pack 2 described later.

FIG. 3A is a plan view of the power supply connector 3, and FIG. 3B is a plan sectional view showing a part of the power supply connector 3.
The power supply connector 3 is provided so that the contact portion of each connection terminal is exposed to the battery pack mounting portion 15, and electrically connects the battery pack 2 mounted on the battery pack mounting portion 15 and the circuit board in the housing 1. To connect to. The power connection connector 3 includes a positive power connection terminal 4 that is pressed against the positive terminal of the battery pack 2 by an urging force, a negative power connection terminal 5 that is pressed against the negative terminal by an urging force, and a thermistor (temperature detection element) terminal. And a terminal case 7 for holding the positive power source connection terminal 4, the negative power source connection terminal 5 and the T terminal 6, respectively. The positive power connection terminal 4 is disposed on the left side in the figure, the T terminal 6 is disposed in the center, and the negative power connection terminal 5 is disposed on the right side.

The positive power connection terminal 4 includes two contact portions (plungers) 41A and 41B that contact the positive terminal of the battery pack 2, housings 42A and 42B that hold the contact portions 41A and 41B, and springs 43A and 43B. I have.
The housing 42A (42B) has a hollow portion 42a having a small diameter on the distal end side and a large diameter on the proximal end side, and a rod-shaped contact portion 41A (41B) and a spring 43A (43B) are accommodated in the hollow portion 42a. And the cover 44A (44B) is attached to the base end side. A push spring is used as the spring 43A (43B), and a rod-shaped contact portion 41A (41B) is supported so as to be slidable in the coaxial direction. The housing 42A (42B) may be made of either metal or resin, but the rod-shaped contact portion 41A (41B), the spring 43A (43B) and the cover 44A (44B) are all made of metal, and the cover A part of 44A (44B) is soldered to a predetermined terminal on the circuit board.

The negative power supply connection terminal 5 has the same configuration as the positive power supply connection terminal 4, and includes two contact portions 51A and 51B that contact the negative electrode terminal of the battery pack 2, and housings 52A and 52B that hold the contact portions 51A and 51B. And a metal spring (not shown) and a metal cover (not shown).
The T terminal 6 has the same configuration as that of one of the positive power supply connection terminals 4, and includes one contact portion 61, a housing 62 that holds the contact portion 61, a metal spring (not shown), and a metal cover ( (Not shown).

  The positive power source connection terminal 4, the negative power source connection terminal 5 and the T terminal 6 configured as described above are incorporated at predetermined intervals on the end surface of the terminal case 7 in the longitudinal direction (surface facing the battery pack mounting portion 15). . That is, the tips of the housings 42A, 42B, 52A, 52B, 62 and the contact portions 41A, 41B, 51A, 51B, 61 extend toward the battery pack mounting portion 15 and are exposed to the battery pack mounting portion 15.

  In the positive power supply connection terminal 4, the springs 43 </ b> A and 43 </ b> B that slidably support the contact portions 41 </ b> A and 41 </ b> B have different spring constants. In addition, in the negative power source connection terminal 5, the springs that slidably support the contact portions 51A and 51B have different spring constants. In the present embodiment, of the positive power connection terminal 4, the outer contact portion (hereinafter referred to as the first contact portion 41A) is connected to the spring 43B of the inner contact portion (hereinafter referred to as the second contact portion 41B). A spring having a smaller spring constant than the spring 43A of the negative power source connection terminal 5 is used, and an outer contact portion (hereinafter referred to as the second contact portion 51B) of the negative power source connection terminal 5 is also used. A spring having a smaller spring constant than that of the first contact portion 51A) is used. The springs of the first contact portion 41A of the positive power connection terminal 4 and the springs of the first contact portion 51A of the negative power connection terminal 5 are springs having the same spring constant as the spring of the T terminal 6. ing.

  As shown in FIG. 2, the battery pack 2 includes a battery pack body 21 that houses a rechargeable battery such as a lithium ion battery, and a lid portion 22 that is provided in the battery pack body 21 and closes the battery pack mounting portion 15. I have. The battery pack main body 21 has a substantially rectangular parallelepiped shape that is substantially the same size as the battery pack mounting portion 15, and the lid portion 22 has a rectangular plate shape that is slightly larger than the battery pack main body 21. Accordingly, the battery pack main body 21 is mounted on the battery pack mounting portion 15, and the lid portion 22 is disposed on the left and right side wall surfaces 15 b and 15 b of the battery pack mounting portion 15 so that the lid portion 22 and the back surface of the lower case 12 are connected. It will be the same.

On the lower end surface of the battery pack body 21 facing the power connection connector 3, the positive terminal 23 that contacts the contact portions 41 </ b> A and 41 </ b> B of the positive power connection terminal 4 and the negative terminal that contacts the contact portions 51 </ b> A and 51 </ b> B of the negative power connection terminal 5. 24, a thermistor terminal 25 with which the contact portion 61 of the T terminal 6 comes into contact is provided.
Further, locking claws 26, 26 that lock into locking holes 16, 16 formed in the lower side wall surface 15 a of the battery pack mounting portion 15 are formed on both sides of the lower end surface of the battery pack body 21. Further, a locking claw (not shown) formed integrally with a sliding lock member 17 provided on the back surface of the lower case 12 is provided at the center of the upper end surface of the battery pack body 21 and on the lid portion 22 side. A locking hole 27 to be locked is formed. The lock member 17 is slidably assembled on the back surface of the lower case 12 in the vicinity of the upper wall surface 15c forming the battery pack mounting portion 15.

In the battery pack 2, the battery pack 2 is placed in a state where the locking claws 26, 26 provided on the lower end side of the battery pack 2 are aligned so as to be inserted into the locking holes 16 in the battery pack mounting portion 15. Is pushed into the battery pack mounting portion 15, the lock member 17 is slid toward the battery pack 2, and a locking claw formed integrally with the lock member 17 is inserted into the locking hole 27 at the upper end of the battery pack 2. It is locked by doing.
As a result, the battery pack 2 is fixed in the battery pack mounting portion 15, and the contact portions 41A, 41B, 51A, 51B of the power connection terminals 4, 5 are brought into contact with the terminals 23, 24 of the battery pack 2 to conduct electricity. To do.

Next, regarding the responsiveness of the first contact portion 41A and the second contact portion 41B to external impact when the spring constants of the first and second contact portions 41A, 41B are made different in the positive power supply connection terminal 4. explain.
FIG. 4 is a graph showing the relationship between acceleration and time when an impact corresponding to an impact dropped from a height of 10 cm is applied when the weight of the mobile phone 100 is 200 g. Here, based on the spring constant of the first contact portion 41A, the numbers (50%, 30%, 25%, 20%, 10%, 5%) shown in the graph are the second contact portion 41B. Is changed to 50%, 30%, 25%, 20%, 10%, and 5% of the spring constant of the first contact portion 41A.

As is apparent from FIG. 4, the smaller the spring constant of the second contact portion 41B relative to the spring constant of the first contact portion 41A, the smaller the acceleration and the longer the response period. In order to reduce the instantaneous interruption reduction due to external impact at the power connection terminal of double contact structure, the mutual spring constants are in anti-phase state (the direction of acceleration is the reverse state) when the cycle fluctuation of the mutual spring part is early. It is desirable to make a combination in which the state continues for a long time.
When the spring constant of the second contact portion 41B is set to 50% of the spring constant of the first contact portion 41A, as shown in FIG. 4, the first contact portion 41A having a reference spring constant is used. Since the anti-phase state is in a period of about a quarter of a period after the acceleration turns negative in the first period, it is possible to reduce the occurrence of instantaneous interruption due to external impact.

When the spring constant of the second contact portion 41B is set to 30%, 25%, and 20% of the spring constant of the first contact portion 41A, the acceleration of the first contact portion 41A having the reference spring constant is increased. After turning negative in the first cycle, the phase is in an antiphase state for about one cycle, and the acceleration is about half of the acceleration of the first contact portion 41A, so that the spring constant of the first contact portion 41A is 50%. The occurrence of the instantaneous interruption phenomenon can be further reduced than the case.
When the spring constant of the second contact portion 41B is set to 10% and 5% of the spring constant of the first contact portion 41A, the acceleration of the first contact portion 41A having the reference spring constant is the first period. In this case, the phase is in the opposite phase for about the latter half of the cycle, and the acceleration is 30% or less of the acceleration of the first contact portion 41A. In this case as well, the spring constant is 50% of the first contact portion 41A. The occurrence of the instantaneous interruption phenomenon can be reduced as compared with the case where it is done.
In addition, since the same result can be obtained also about the 1st contact part 51A and the 2nd contact part 51B of the negative power supply connection terminal 5, description is abbreviate | omitted.

  As described above, according to the embodiment of the present invention, the positive power supply connection terminal 4 and the negative power supply connection terminal 5 are pressed against the electrode terminals 23 and 24 of the battery pack 2 by the urging force when the battery pack 2 is mounted. Two contact portions 41A, 41B, 51A, 51B, the spring constants of the contact portions 41A, 41B in the positive power supply connection terminal 4 are different from each other, and the springs of the contact portions 51A, 51B in the negative power supply connection terminal 5 Since the constants are also different from each other, when an external impact is applied, the response to the external impact between the contact portions 41A and 41B of the positive power connection terminal 4 changes, so that the contact portions 41A and 41B are positive. It is possible to reduce the simultaneous release from the pressure contact state with the terminal 23. Similarly, in the negative power supply connection terminal 5, it is possible to reduce the contact portions 51 </ b> A and 51 </ b> B from being simultaneously released from the pressure contact state with the negative electrode terminal 24, and as a result, the occurrence of instantaneous interruption phenomenon is reduced. can do.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, it can change suitably.
5 and 6 are modifications of the connection structure between the contact portions 41A, 41B, 51A, 51B and the battery pack 2, and are schematic plan views.
In FIG. 5, the contact portions 41 </ b> A, 41 </ b> B, 51 </ b> A, 51 </ b> B of the positive power connection terminal 4 and the negative power connection terminal 5 are arranged separately on the upper end surface and the lower end surface of the battery pack 2. Specifically, the contact portion 41A of the positive power connection terminal 4 is disposed on the left side of the lower end surface of the battery pack 2, the T terminal 6 is disposed in the center, and the contact portion 51A of the negative power connection terminal 5 is disposed on the right side. Further, the contact portion 41B of the positive power supply connection terminal 4 is arranged on the left side of the upper end surface of the battery pack 2, and the contact portion 51B of the negative power supply connection terminal 5 is arranged on the right side. The contact portions 41A and 41B of the positive power supply connection terminal 4 show different spring constants, and the contact portions 51A and 51B of the negative power supply connection terminal 5 show different spring constants. That is, the spring constants of the upper contact portions 41B and 51B may be set smaller than the spring constants of the lower contact portions 41A and 51A. Or it may be upside down.
In this way, since the upper contact portions 41A and 51A and the lower contact portions 41B and 51B have different spring constants, the responsiveness to external impacts is different. It is possible to reduce the simultaneous opening from the pressure contact state with the electrode terminal. In particular, since the contact portions 41A and 41B of the positive power connection terminal 4 and the contact portions 51A and 51B of the negative power connection terminal 5 are provided on the upper and lower end surfaces of the battery pack 2, the impact phase can be reversed. It is effective in.

In FIG. 6, the contact portions 41 </ b> A, 41 </ b> B, 51 </ b> A, 51 </ b> B of the positive power supply connection terminal 4 and the negative power supply connection terminal 5 are separately arranged on the lower end surface and the left and right side surfaces of the battery pack 2. Specifically, the contact portion 41A of the positive power connection terminal 4 is disposed on the left side of the lower end surface of the battery pack 2, the T terminal 6 is disposed in the center, and the contact portion 51A of the negative power connection terminal 5 is disposed on the right side. Further, the contact portion 41B of the positive power supply connection terminal 4 is disposed on the left side surface of the battery pack 2, and the contact portion 51B of the negative power supply connection terminal 5 is disposed on the right side surface. The contact portions 41A and 41B of the positive power supply connection terminal 4 show different spring constants, and the contact portions 51A and 51B of the negative power supply connection terminal 5 show different spring constants. As for the magnitude of the spring constant, the contact portions 41B and 51B provided on the left and right side surfaces may be enlarged, or the contact portions 41A and 51A provided on the lower end surface may be enlarged.
As described above, the contact portions 41A and 41B of the positive power connection terminal 4 and the contact portions 51A and 51B of the negative power connection terminal 5 are provided on the lower end surface and the left and right side surfaces of the battery pack 2, respectively. Is effective.
In addition, the contact portions 41A and 41B of the positive power supply connection terminal 4 and the contact portions 51A and 51B of the negative power supply connection terminal 5 are not limited to two, and three or more may be provided.

In the above embodiment, the contact portions 41A, 41B, 51A, 51B, 61 are slidably supported by the springs 43A, 43B in the housings 42, 52, 62. However, the contact portions 41A, 41B , 51A, 51B, 61 themselves may be configured by leaf springs. In this case, the spring constant of the contact portion may be set as described above by changing the plate thickness of the leaf spring constituting the contact portion.
Further, the contact portions 41A and 41B of the positive power supply connection terminal 4 are configured such that the outside has a large spring constant and the inside has a small spring constant. good. Further, the arrangement of the contact portions 51A and 51B of the negative power supply connection terminal 5 may be similarly changed.
In the above embodiment, the present invention is applied to the mobile phone 100. However, the present invention is not limited to the mobile phone 100 but can be applied to other electronic devices such as a PHS, a transceiver, a PDA, and a portable personal computer.

FIG. 3 is an exploded perspective view when the mobile phone 100 is viewed from the back side. 3 is a perspective view of a battery pack 2. FIG. (a) is a plan view of the power supply connector 3, and (b) is a plan sectional view showing a part of the power supply connector 3. It is the figure which showed the relationship between acceleration and time about the responsiveness of the 1st contact part 41A and the 2nd contact part 41B with respect to an external impact. It is a modification of the connection structure of contact part 41A, 41B, 51A, 51B and the battery pack 2, and has shown the schematic plan view. It is a modification of the connection structure of contact part 41A, 41B, 51A, 51B and the battery pack 2, and has shown the schematic plan view.

Explanation of symbols

2 battery pack 3 power connection connector 4 positive power connection terminal 5 negative power connection terminal 15 battery pack mounting part 41A first contact part 41B second contact part 51A first contact part 51B second contact part 100 mobile phone

Claims (2)

A battery pack mounting portion to which the battery pack is detachably mounted is provided with a positive power connection terminal connected to the positive terminal of the battery pack and a negative power connection terminal connected to the negative terminal,
In the battery pack mounted state, the positive power connection terminal includes the positive terminal, the negative power connection terminal includes the negative terminal, and includes at least two contact portions that are pressed by an urging force.
An electronic apparatus characterized in that the spring constants of the contact portions are different from each other in the positive power supply connection terminal and the negative power supply connection terminal.   2. The electronic device according to claim 1, wherein the contact portions having different spring constants have one spring constant of 30% or less of the other spring constant.

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