JP2004192915A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of stably introducing power to a power feeding part from the outside. <P>SOLUTION: A power feeding terminal 2 fixed to a casing of this electronic apparatus is formed of a conductive member, and has a terminal part 21 exposed to the outside of the casing, and a terminal part 22 projecting into the casing and having a recessed part 22a formed at the center; and they are fixed at a coming-off prevention part 23. Winding parts 31a of coil springs 31 formed of a conductive member are wound around a printed circuit board 3 with a circuit or the like printed. The tip part 31b of the coil spring is inserted into the recessed part 22a of the terminal 2. The tip part 31b of the coil spring 31 is brought into contact with the inside surface of the recessed part 22a of the terminal 2 by repulsion of the spring, and the winding part 31a of the coil spring 31 is brought into contact with the tip of the terminal part 22 of the terminal 2 by the repulsion of the spring. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic device that draws power from the outside of a housing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a mechanism of a power supply externally supplied to an electronic device, for example, a portable device, has a receiving terminal 4a on a side of a table 4 which is a charger, as shown in FIG. Power is supplied to the portable device from the table 4 by bringing the power supply terminal 5a into contact. The power supply terminal 5a provided on the portable device 5 is usually fixed in a housing to prevent dust and water from entering from outside.
[0003]
In this way, the power supplied from the outside is drawn into a board, for example, on which a circuit or the like in the portable device is printed, but the housing and the board do not always move in accordance with impact or vibration, In some cases, the movement between the power supply terminal fixed to the housing and the internal substrate is shifted. Therefore, when the power supply terminal is directly soldered to the substrate and attached, a load may be applied to the substrate or the soldered portion due to impact or vibration, and the displacement may not be absorbed, and the substrate or the soldered portion may be damaged.
[0004]
Therefore, there is known a structure in which a leaf spring 8 is provided to absorb the occurrence of displacement between the power supply terminal 6 and the substrate 7 as shown in FIG. That is, a plate spring 8 made of a conductive member bent in a substantially U shape is soldered to the substrate 7 as a power supply terminal, and the power supply terminal 6 fixed to the housing when the substrate 7 is mounted at a predetermined position is a plate spring. 8 to be in contact. By utilizing the repulsive force of the leaf spring 8, the displacement between the power supply terminal 6 and the substrate 7 can be absorbed, and power can be taken into the substrate 7 from an external power supply.
[0005]
[Problems to be solved by the invention]
However, when a shock or vibration is given to the portable device and the power supply terminal 6 and the substrate 7 are displaced from each other, the power supply terminal 6 moves in the left and right direction in FIG. The repulsion is weakened, and poor contact is likely to occur.
[0006]
Further, in general, when a leaf spring is used, durability may be significantly reduced due to scratches caused by bending processing or eyes of a steel sheet, and not only when the above-described poor contact with the power supply terminal occurs, but also at the worst case. In the case of (1), a case may be considered in which the leaf spring breaks from the bent portion to short-circuit the electronic component.
[0007]
The present invention has been made in view of the above circumstances, and an object thereof is to connect a first power supply terminal and a power supply unit which are connected to a first power supply terminal and a power supply unit made of a conductive member fixed to a housing. It is an object of the present invention to provide an electronic device that has a second power supply terminal made of a conductive member that stably absorbs a deviation from the power supply, so that a power supply can be stably drawn into the power supply unit.
[0008]
[Means for Solving the Problems]
The present invention provides a first power supply terminal having an exposed portion exposed to the outside of the housing, a protrusion protruding into the housing and having a recess formed in the center, and made of a conductive member, and one end connected to a power supply unit in the housing. A second power supply terminal which is connected and the other end is inserted into a recess of the first power supply terminal and is entirely formed as a coil spring made of a conductive member. Power is drawn into the power supply unit via the power supply.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment is a case where the present invention is applied to a mobile phone.
FIG. 1 is a diagram schematically illustrating a position of a power supply terminal 2 as a first power supply terminal of the mobile phone 1. Two power supply terminals 2 are provided on the bottom surface of the mobile phone 1, and each power supply terminal 2 is fixed to a housing of the main body.
[0010]
FIG. 2 is a diagram illustrating the power supply terminal 2. The power supply terminal 2 is exposed outside the housing of the mobile phone 1, for example, a terminal portion 21 for receiving power supply from the table 4 shown in the conventional example, and a terminal protruding inside the housing of the mobile phone 1. The part 22 is fixed by a retaining part 23. The terminal portion 22 is a protruding portion that protrudes into the housing and has a concave portion 22a formed at the center, and has a substantially U-shaped cross section. The diameter of the opening of the recess 22a gradually increases near the tip on the protruding side. The terminal portions 21 and 22 are both formed of a conductive member.
[0011]
FIG. 3 shows a printed circuit board 3 as a power supply unit on which circuits for realizing various functions of the mobile phone 1 are printed, and a coil spring 31 as a second power supply terminal.
[0012]
The coil spring 31 includes a coil-shaped winding part 31a and a rod-shaped tip part 31b having a predetermined length for contacting the concave part 22a of the terminal part 22. As shown in the figure, the coil spring 31 has a winding portion 31a wound around one end of the printed circuit board 3 in the longitudinal direction. One end of the winding portion 31a of the coil spring 31, that is, the end of the printed board 3 opposite to the end on which the coil spring 31 is wound is fixed to the printed board 3 by, for example, soldering. The coil spring 31 is entirely formed of a conductive member.
[0013]
FIG. 4 is a diagram for explaining a structure for taking in power from the power supply terminal 2 to the printed circuit board 3.
The printed circuit board 3 is inserted into the housing of the mobile phone 1 such that the longitudinal direction thereof is substantially parallel to the longitudinal direction of the power supply terminal 2, and the distal end portion 31 b of the coil spring 31 is inserted into the concave portion 22 a of the terminal portion 22 of the power supply terminal 2. It is attached. The position of the tip portion 31b with respect to the opening of the concave portion 22a of the terminal portion 22 is located at a portion where the diameter of the opening of the concave portion 22a is gradually increased in a normal state where no force is applied to the coil spring 31. I have. The position where the coil spring 31 is fixed to the printed circuit board 3 is a position where the coil spring 31 is contracted in the longitudinal direction of the printed circuit board 3 by the tip of the terminal portion 22 of the power supply terminal 2. In this embodiment, the length of the distal end portion 31b of the coil spring 31 is shorter than the depth of the concave portion 22a of the terminal portion 22.
[0014]
When the printed circuit board 3 to which the coil spring 31 is fixed is pushed in for mounting in the direction indicated by the arrow in the figure, the tip 31b of the coil spring 31 is moved to a position where the diameter of the opening of the concave portion 22a of the terminal portion 22 gradually increases. Because of the contact, the distal end portion 31b of the coil spring 31 is gradually pulled toward the center of the opening as it is pushed in, and is always pulled with a constant strength when it is further pushed in and the diameter of the opening becomes constant. That is, when the tip portion 31b of the coil spring 31 is inserted into the concave portion 22a, the tip portion 31b always comes into contact with the inner peripheral surface thereof due to the repulsive force of the coil spring 31.
[0015]
Further, when the printed circuit board 3 is attached to the housing of the mobile phone 1, the coil spring 31 is contracted in the longitudinal direction of the printed circuit board 3, so that the winding portion 31a of the coil spring 31 always contacts the tip of the terminal portion 22 due to the repulsive force of the spring. Become like
[0016]
FIG. 5 is a diagram illustrating a state in which the power supply terminal 2 and the coil spring 31 of the printed circuit board 3 are in contact with each other. The distal end portion 31b of the coil spring 31 contacts the inner peripheral surface of the concave portion 22a of the terminal portion 22 of the power supply terminal 2, and the coil spring 31 contacts the distal end of the terminal portion 22.
[0017]
Since the power supply terminal 2 and the coil spring 31 of the printed circuit board 3 are configured as described above, the power supply terminal 2 and the printed circuit board 3 fixed to the housing of the mobile phone 1 may be subjected to the impact applied to the mobile phone 1. Even when the power supply terminal 2 performs different operations due to vibration, the distal end portion 31b of the coil spring 31 moves along the inner peripheral surface of the concave portion 22a of the terminal portion 22 of the power supply terminal 2 in the radial direction of the power supply terminal 2, and In the longitudinal direction, the tip of the winding portion 31a of the coil spring 31 moves so as to be in contact with the tip of the terminal portion 22 of the power supply terminal 2.
[0018]
Therefore, even if the mobile phone 1 is moved in any direction due to shock or vibration, the coil spring 31 always absorbs the displacement between the power supply terminal 2 and the printed circuit board 3. It can be connected and can take in power.
[0019]
In addition, since the coil spring 31 has less variation in durability and is more resistant to scratches and deformation than a leaf spring bent in a substantially U-shape, the power supply terminal 2 and the printed circuit board 3 formed by the coil spring 31 include aging. As a result, stable control of the power supply terminal using the coil spring 31 can be simplified. Furthermore, the occurrence of a short-circuit of the electronic component due to a spring break generated in a leaf spring or the like can be reduced because the coil spring 31 is hardly affected by a scratch or the like.
[0020]
Although the length of the distal end portion 31b of the coil spring 31 is shorter than the depth of the concave portion 22a of the terminal portion 22 of the power supply terminal 2, it may be longer than the concave portion 22a. In this case, there is no contact between the winding portion 31a of the coil spring 31 and the tip of the terminal portion 22 of the power supply terminal 2, but since the tip of the tip portion 31b of the coil spring 31 always contacts the bottom surface of the concave portion 22a of the terminal portion 22, Even in the longitudinal direction of the printed circuit board 3, the coil spring 31 can always move so as to absorb the displacement and contact with the power supply terminal 2.
[0021]
FIG. 6 is a diagram showing another embodiment of a structure for taking in power from the power supply terminal 2 ′ to the printed circuit board 3. In this embodiment, the terminal portion 22 'of the power supply terminal 2' is formed by integrally forming cylindrical conductive members having different diameters, and has a substantially T-shaped cross section. The large-diameter cylindrical portion of the terminal portion 22 ′ is fixed to the terminal portion 21 by the retaining portion 23, and the small-diameter cylindrical portion protrudes inside the housing. Further, one end of a coil spring 32 made of a conductive member is attached to the printed circuit board 3 as in the case described in the above embodiment. The other end of the coil spring 32 is wound around the end of the printed circuit board 3 and the outer periphery of the small-diameter cylindrical portion of the terminal portion 22 'so as to contact the large-diameter cylindrical portion of the terminal portion 22'. That is, when the printed circuit board 3 is mounted inside the housing, one end of the coil spring 32 is fixed to the printed circuit board 3 and the other end is brought into contact with the terminal portion 22 ′ to be contracted. Therefore, the printed circuit board 3 and the terminal portion 22 ′ can always come into contact with each other even when the mobile phone 1 is moved in any direction due to the impact or vibration given to the mobile phone 1 by the repulsive force of the coil spring 32.
Therefore, the mobile phone 1 always absorbs the displacement between the power supply terminal 2 and the printed circuit board 3 by the coil spring 32 irrespective of the direction in which the mobile phone 1 is moved by impact or vibration, so that the power supply terminal 2 and the printed circuit board 3 are stably formed. It can be connected and can take in power.
[0022]
Although both of the above-described embodiments have been described with reference to the case where the present invention is applied to a mobile phone, the present invention is not necessarily limited to this, and can be applied to an electronic device that is supplied with power from the outside.
The present invention can be applied not only to power supply but also to transmission of signals between devices.
[0023]
【The invention's effect】
According to the embodiments of the present invention described above, it is possible to provide an electronic device capable of stably drawing a power supply from the outside into a power supply unit.
[Brief description of the drawings]
FIG. 1 is a diagram showing an appearance of a mobile phone according to an embodiment of the present invention.
FIG. 2 is a diagram showing a power supply terminal for receiving power supply from the outside according to the embodiment;
FIG. 3 is a diagram showing a coil spring wound around a printed board in the embodiment.
FIG. 4 is a diagram illustrating a structure for taking in power from the outside in the embodiment.
FIG. 5 is a diagram showing a state in which each power supply terminal according to the embodiment is in contact;
FIG. 6 is a diagram showing a structure for taking in power from outside according to another embodiment;
FIG. 7 is a diagram showing a conventional portable device and a charger.
FIG. 8 is a diagram showing a state in which the power supply terminals of the conventional example are in contact with each other.
[Explanation of symbols]
1: Mobile phone 2: Power supply terminal (first power supply terminal)
22a ... recess 3 ... printed circuit boards 31 and 32 ... coil spring (second power supply terminal)
31a ... winding part 32b ... tip part

Claims (1)

A first power supply terminal made of a conductive member, having an exposed portion exposed to the outside of the housing and a protrusion formed in the center and formed with a concave portion at the center; and one end connected to a power supply unit in the housing. A second power supply terminal having the other end inserted into the concave portion of the first power supply terminal and formed entirely as a coil spring made of a conductive member;
An electronic apparatus, wherein power is drawn from the first power supply terminal to the power supply unit via the second power supply terminal.

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