JP4047101B2 - Portable wireless device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable wireless device such as a transceiver or a cellular phone having a structure in which an antenna, a switch, or the like is exposed to the outside of a case.
[0002]
[Prior art]
As shown in FIG. 5, the conventional portable radio apparatus of this type has an external appearance composed of a front case 101 and a battery pack 102 on the back thereof, and an antenna connector 103 and a button switch 104 are provided on the upper end surface of the front case 101. Exposed. An antenna body (rod antenna) is connected to the antenna connector 103 by screw coupling.
[0003]
FIG. 6 is an exploded perspective view of the portable wireless device. The front case 101 has mounting bosses 105 each having screw holes at the four corners of the front case 101. An opening 106 for the antenna connector 103 and an opening 107 for the button switch 104 are provided at the protruding portion at the upper end of the front case 101. Concave surface 101a having is formed. A rubber waterproof packing 108 is fitted into the concave surface 101a and fixed, or is fitted and fixed by adhesion. The waterproof packing 108 is formed with a seal boss 108a for the antenna connector 103 and a cap 108b for the button switch 104. Further, from the top of the waterproof packing 109, the presser plate 109 is fitted and fixed, or is fitted and fixed by adhesion. The presser plate 109 has a through hole 109 a for the antenna connector 103 and a through hole 109 b for the button switch 104. The circuit board 110 accommodated in the front case 101 has an antenna connector 103, a button switch 104, and other electronic components mounted on the front surface, and a power amplifier required for wireless transmission on the back surface of the circuit board 110. 111 is mounted by soldering. The circuit board 110 has two mounting holes 112 and four mounting holes 113 at four corners, and is fixed to the surface of the chassis 115 by screws 114 through the two mounting holes 112. A concave groove 115a is formed around the chassis 115, and a rubber seal ring 116 is fitted into the concave groove 115a. The chassis 115 assembled in this way passes the antenna connector 103 and the button switch 104 of the circuit board 110 through the openings 106 and 107 of the front case 101, accommodates the circuit board 110 in the front case 101, and then the chassis 115. The four mounting holes 117 are screwed through the screw holes of the mounting bosses 105 of the front case 101 through the screws 118 to assemble the front case 101.
[0004]
FIG. 7 shows a longitudinal section of a conventional portable radio apparatus assembled in this way. Since the power amplifier 111 is in contact with the surface of the chassis 115, the heat generated from the power amplifier 111 when the portable wireless device is used is dissipated through the chassis 115 to prevent the temperature inside the portable wireless device from rising. Further, the intrusion of water into the front case 101 is prevented by the seal ring 116 mounted in the concave groove 115 a formed around the chassis 115 coming into contact with the inner surface of the peripheral wall of the front case 101. Further, in the vicinity of the antenna connector 103, the seal boss 108a of the waterproof packing 108 at the upper end of the front case 101 is sandwiched between the opening 106 and the antenna connector 103, thereby preventing water from entering.
[0005]
[Problems to be solved by the invention]
However, in the above conventional portable wireless device, the chassis 115 has a single flat plate shape made of metal, and the battery pack 102 is mounted on the back of the chassis 115, so that the heat from the power amplifier 111 is sufficiently absorbed. There was a problem in that it could not be dissipated in the air, the temperature inside the portable wireless device increased, and the reliability decreased.
[0006]
In addition, in the state of use of the portable wireless device in which the antenna body (not shown) is connected to the tip of the antenna connector 103 and the battery pack 102 is mounted on the back surface of the front case 101, the portable terminal device is accidentally dropped from the antenna body side. In this case, the impact is applied to the antenna connector 103 from the antenna body, and there is a problem in that the solder joint between the antenna connector 103 and the circuit board 110 is cracked or cracked, resulting in a decrease in reliability.
[0007]
In addition, when the mobile wireless device is vibrated or accidentally dropped, the battery pack 102 may spread the peripheral wall of the front case 101 outward, and the waterproof function of the seal ring 116 is impaired. As a result, there was a problem that reliability was lowered. Furthermore, as a result of the peripheral wall of the front case 101 opening outward, there is a problem that a step is formed between the end surface of the peripheral wall and the battery pack 102, resulting in poor appearance quality.
[0008]
The present invention solves such a conventional problem, and efficiently dissipates heat of the power amplifier of the portable wireless device, so that even when the device falls from the antenna body side, the impact is not directly applied to the circuit board. An object of the present invention is to provide a portable wireless device with improved reliability and improved waterproofness.
[0009]
In order to achieve the above object, a portable wireless device of the present invention includes a circuit board on which electronic components are mounted, a box-shaped chassis that has side walls in four sides and the circuit board is attached to one open surface. a battery pack attached to the back side of the open face of the chassis, a front case of box-shape covering a portion of the open face of the chassis having a side wall in all directions sidewall of the battery pack from the outside In the portable wireless device comprising: the engaging portion formed to protrude toward the side wall end surface on the outer side of the base portion of both side walls along the longitudinal direction of the chassis; and the engagement portion on the inner side portion of the opposite side walls of the front case. The joint portion includes an engaged portion that protrudes in the opposite direction and meshes with the engaging portion . With this configuration, heat generated from the electronic components can be efficiently dissipated from the respective side walls of the chassis through the side walls of the front case into the outside air, and even if the front case side walls are opened due to a fall of the portable wireless device, The seal ring disposed at the bottom of the front case can effectively maintain the waterproofing between the chassis and the front case, and can improve the reliability of the apparatus. Further, when the chassis and the front case are assembled, the waterproof property can be enhanced by the engagement between the engaging portion and the engaged portion formed on both side walls. In addition, when the portable wireless device is used or dropped, even if a force is applied to the battery pack to push the side wall of the front case outward, it can prevent the chassis from opening outward due to the staggered engagement. In addition, no step is generated on the mating surface with the side surface of the battery pack, and the appearance quality can be maintained.
[0010]
The portable wireless device of the present invention includes an attachment hole for fixing at least an antenna connector formed on one side wall of the chassis, an antenna connector attached to the attachment hole via a waterproof packing, and the circuit board. A contact piece fixed to the antenna connector and having a spring property capable of contacting the terminal of the antenna connector; and an opening formed on a side wall of the front case that faces the side wall of the chassis to expose the antenna connector. It is a thing. With this configuration, even when the portable wireless device falls from the antenna body side, the antenna connector is directly fixed to the chassis, and the antenna connector and the circuit board are conducted through the contact piece, so the impact of the antenna connector is affected by the circuit board. It is possible to prevent the occurrence of cracks and the like due to being added to the film, and to improve the reliability.
[0011]
The portable wireless device according to the present invention may further include a protrusion formed on the outside of the side wall of the chassis to which the antenna connector is attached, and an inside of the side wall of the front case facing the side wall of the chassis. A concave groove that engages with the protrusion, and the chassis and the front case are coupled by both engagement of the protrusion and the concave groove and screwing with a screw. With this configuration, the number of locations where the chassis is screwed to the front case can be reduced, the structure can be simplified, and the number of parts, manufacturing and assembly steps can be reduced.
[0013]
The portable wireless device of the present invention is characterized in that a conductive layer is provided on the entire inner surface including the side wall of the front case. With this configuration, the inside of the portable wireless device can be sealed in a sealed manner with the conductive chassis and the conductive film layer of the front case, and electromagnetic noise generated from the circuit board inside the portable wireless device is prevented from leaking to the outside. can do.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is an exploded perspective view showing the configuration of the portable radio apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a longitudinal sectional view thereof. The overall appearance of the apparatus is almost the same as the conventional example shown in FIG. 1 and 2, the front case 1 is formed in a box shape from an insulating resin material, and mounting bosses 2 each having screw holes 2a are formed at four locations on the bottom 1a. Of the four side walls of the front case 1, an opening 4 for the antenna connector 3 and an opening 5 for the button switch are formed in the side wall 1b at the upper end. A recess groove 6 is formed in an annular shape around the bottom portion 1 a in the front case 1, and a conductive rubber seal ring 7 is mounted in the recess groove 6. On the other hand, a contact piece 9 having a spring property that can contact the terminal 3c of the antenna connector 3, a button switch 10, and other electronic components are mounted on the surface of the circuit board 8, and wireless transmission is performed on the back surface of the circuit board 8. A power amplifier 11 that is sometimes required is mounted by soldering. The circuit board 8 has two mounting holes 12 and four mounting holes 13 at four corners, and is fixed to the inside of the chassis 15 by screws 14 through the two mounting holes 12. The chassis 15 is formed in an aluminum die-cast box shape having sidewalls on all sides, but a non-metallic material may be used as long as it has conductivity. A concave surface 15 b having a screw hole 16 for fixing the antenna connector 3 and a through hole 17 for the button switch 10 is formed outside the side wall 15 a at the upper end of the chassis 15. A rubber waterproof packing 18 having a seal boss 18a for the antenna connector 3 and a cap 18b for the button switch 10 is fitted and fixed to the concave surface 15b. The antenna connector 3 is formed in a cylindrical shape having a flange 3a at an intermediate portion, a female screw to which an antenna body (rod antenna) is coupled is formed at an inner peripheral portion, and a male screw is formed at an outer peripheral trunk portion 3b. A terminal 3c for electrical connection protrudes from the end of the body 3b.
[0015]
Next, the assembly of the portable wireless device in this embodiment will be described. First, the waterproof packing 18 is fitted into the concave surface 15b of the chassis 15 and fixed, or is fitted and fixed, and then the outer peripheral body 3b of the antenna connector 3 is inserted into the seal boss 18a of the waterproof packing 18 and the screw hole 16 of the chassis 15 is inserted. To be fixed to the chassis 15. Next, the circuit board 8 on which necessary components are mounted is placed in the chassis 15, and the screw 14 is screwed into the screw hole of the mounting boss 19 of the chassis 15 through the mounting hole 12. Next, after the seal ring 7 is mounted in the concave groove 6 of the front case 1, the chassis 15 to which the circuit board 8 is attached is connected to the antenna connector 3 and the cap 18b protruding from the waterproof packing 18, respectively. 5 is inserted into the front case 1, and the screw 21 is screwed into the screw hole 2 a of the mounting boss 2 of the front case 1 through the boss hole 20 of the chassis 15 and the mounting hole 13 of the circuit board 8. As a result, the outer surfaces of the four side walls of the chassis 15 come into contact with the inner surfaces of the four side walls of the front case 1 and the end surfaces of the four side walls of the chassis 15 press the seal ring 7. Waterproof between is given. Further, the waterproof packing 18 provides waterproofing between the opening 4 of the front case 1 and the antenna connector 3. The terminal 3 c of the antenna connector 3 is connected to the circuit board 8 through the contact piece 9, and the power amplifier 11 on the back surface of the circuit board 8 contacts the chassis 15. In the assembled product, the battery pack 22 is attached to the back side of the chassis 15.
[0016]
Thus, according to the first embodiment, since the power amplifier 11 is in contact with the chassis 15 having side walls in all directions, the heat generated from the power amplifier 11 is transmitted from the four side walls of the chassis 15 to the front case 1. It is dissipated into the outside air through each side wall of the device, and the temperature inside the apparatus can be prevented from rising above a predetermined value. Further, when the portable wireless device is used, even if the antenna main body (not shown) is attached to the antenna connector 3 and the battery pack 22 is attached to the rear surface of the chassis 15, the antenna connector 3 is accidentally dropped from the antenna main body. Is screwed into the screw hole 16 of the chassis 15 so that the impact transmitted from the antenna body is received by the highly rigid metal or non-metallic chassis 15 and is not transmitted to the circuit board 8. There are no cracks. Further, even if the side wall of the front case 1 is opened due to a drop of the portable wireless device or the like, the seal ring 7 is mounted in the concave groove 6 in the bottom of the front case 1, so that the waterproof function is not deteriorated. Waterproofing between the chassis 15 and the front case 1 can be ensured.
[0017]
(Embodiment 2)
Next, a second embodiment of the present invention will be described. Since the basic configuration of the portable radio apparatus according to the second embodiment is the same as that of the portable radio apparatus shown in the first embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted. Only the different parts will be described.
[0018]
FIG. 3 shows a longitudinal section of the portable radio apparatus according to the second embodiment. A protrusion 23 is partially formed outside the side wall 15a to which the antenna connector 3 of the chassis 15 is attached (reference numeral 23 in FIG. 1). A concave groove 24 is formed on the inner side of the side wall 1b of the front case 1 facing the side wall 15a. When assembling the chassis 15 to the front case 1, the protrusions 23 are fitted into the concave grooves 24, and the screws 21 are screwed into the screw holes 2 a of the mounting bosses 2 of the front case 1 at two opposite positions.
[0019]
As described above, according to the second embodiment, the assembly of the chassis 15 and the front case 1 is performed by engaging the upper projections 23 and the concave grooves 24 with two screws 21 with the lower screws 21. 1 is not necessary, and the structure of the two screws on the upper side in FIG. 1 is not required, the structure is simplified, and the number of parts, manufacturing, and assembly man-hours can be reduced.
[0020]
(Embodiment 3)
Next, a third embodiment of the present invention will be described. Since the basic configuration of the portable radio apparatus according to the third embodiment is the same as that of the portable radio apparatus shown in the first embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted. Only the different parts will be described.
[0021]
FIG. 4 is a cross-sectional view of the portable wireless device according to the third embodiment, and a triangular cross section is formed on the outer side of the bases of both side walls 15c and 15d along the longitudinal direction of the chassis 15 toward the end faces of the side walls 15c and 15d. The wedge-shaped engagement portion 25 is partially formed (indicated by reference numeral 25 in FIG. 1), and the engagement portion 25 is located inside the side walls 1c and 1d of the front case 1 facing the side walls 15c and 15d. An engaged portion 26 having the same shape in the opposite direction is formed. When the chassis 15 is assembled to the front case 1, the engagement portion 25 is fitted into the engaged portion 26, thereby preventing the chassis 15 from opening outward. The shapes of the engaging portion 25 and the engaged portion 26 may be other shapes as long as they engage with each other.
[0022]
As described above, according to the third embodiment, the wedge-shaped engagement portion 25 formed to protrude toward the end surface of the side walls 15c and 15d along the longitudinal direction of the chassis 15 and the front case 1 The opposite side walls 1c and 1d are provided with the same wedge-shaped engaged portion 26 formed in the opposite direction to the engaging portion 25. Therefore, when the chassis 15 and the front case 1 are assembled, both side walls are provided. Waterproofing can be effectively performed by the staggered engagement between the engaging portion 25 and the engaged portion 26 formed in the above. Further, when the portable wireless device is used or dropped, even if a force is applied to the battery pack 22 to spread the side walls 1c, 1d of the front case 1 outward, the engagement portion 25 and the engaged portion 26 It is possible to prevent the chassis 15 from opening outward due to the staggered engagement, so that no step is generated on the mating surface with the side surface of the battery pack 22, and the appearance quality can be maintained.
[0023]
(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. Since the basic configuration of the portable radio apparatus according to the fourth embodiment is the same as that of the portable radio apparatus shown in the first embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted. Only the different parts will be described.
[0024]
As shown in FIG. 4, the portable wireless device according to the fourth embodiment is obtained by forming a conductive layer 27 on the entire inner surface including the four side walls of the front case 1 by plating, vacuum deposition, painting, or the like. As a result, the conductive chassis 15 and the conductive film layer 27 of the front case 1 come into contact with each other, so that the inside of the portable wireless device is sealed by the conductive member.
[0025]
As described above, according to the fourth embodiment, the inside of the portable wireless device can be hermetically shielded by the conductive chassis 15 and the conductive layer 27 of the front case 1. Electromagnetic wave noise generated from the substrate 8 can be prevented from leaking to the outside, and adverse effects on external electronic devices can be prevented.
[0026]
【The invention's effect】
As described above, the portable wireless device of the present invention includes a circuit board on which electronic components are mounted, a box-shaped chassis having side walls on four sides and attached to one open surface, and the chassis. portable with a battery pack attached to the back side of the open face of the front case of box-shape covering a portion of the open face of the chassis having a side wall in all directions sidewall of the battery pack from the outside In the wireless device, the engagement portion formed to protrude toward the side wall end surface direction on the outer side of the base portion of both side walls along the longitudinal direction of the chassis, and the engagement portion on the inner portion of the opposite side walls of the front case since the reverse is protruded and a engaged portion engaged with the engagement portion, the efficiency of heat generated from the electronic part from the side wall of the chassis to the outside of the air through the side wall of the front case Even when the side wall of the front case opens due to a fall of the portable wireless device, etc., the waterproofing between the chassis and the front case can be effectively maintained by the seal ring placed at the bottom of the front case. And the reliability of the apparatus can be improved. Further, when the chassis and the front case are assembled, the waterproof property can be enhanced by the engagement between the engaging portion and the engaged portion formed on both side walls. In addition, when the portable wireless device is used or dropped, even if a force is applied to the battery pack to push the side wall of the front case outward, it can prevent the chassis from opening outward due to the staggered engagement. In addition, no step is generated on the mating surface with the side surface of the battery pack, and the appearance quality can be maintained.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a configuration of a portable radio apparatus according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of the portable radio apparatus according to Embodiment 1 of the present invention. Fig. 4 is a vertical cross-sectional view of a portable radio apparatus according to the second embodiment. Fig. 4 is a transverse cross-sectional view of the portable radio apparatus according to the third and fourth embodiments of the present invention. 6 is an exploded perspective view showing a configuration of a portable wireless device in a conventional example. FIG. 7 is a longitudinal sectional view of a portable wireless device in a conventional example.
DESCRIPTION OF SYMBOLS 1 Front case 2 Mounting boss 3 Antenna connector 4 Antenna connector opening 5 Button switch opening 6 Waterproof ring concave groove 7 Waterproof ring 8 Circuit board 9 Contact piece 10 Button switch 11 Power amplifier 12 Mounting hole 13 Mounting hole 14 Screw 15 Chassis 16 Screw hole 17 for fixing antenna connector Through hole 18 for button switch Waterproof packing 19 Mounting boss 20 Mounting boss 21 Screw 22 Battery pack 23 Protrusion 24 Concave groove 25 Engagement part 26 Engagement part 27 Conductive film layer

Claims (4)

A circuit board on which electronic components are mounted; a box-shaped chassis in which the circuit board is attached to one open surface having side walls on all sides ;
A battery pack attached to the back side of the open surface of the chassis;
In portable radio apparatus having a front case of box-shape covering the open face of the chassis having a side wall in all directions and a portion of the side wall of the battery pack from the outside,
Engaging portions that are formed to protrude toward the side wall end surfaces on the outer side of the base portions of both side walls along the longitudinal direction of the chassis, and the engaging portions project in the opposite direction to the inner portions of the opposite side walls of the front case. A portable radio apparatus comprising: an engaged portion that is formed and meshes with the engaging portion.   An attachment hole for fixing at least the antenna connector formed on one side wall of the chassis, an antenna connector attached to the attachment hole via a waterproof packing, and a terminal of the antenna connector fixed to the circuit board The portable wireless device according to claim 1, further comprising: a contact piece having a spring property that can be contacted; and an opening formed on a side wall of the front case that faces the side wall of the chassis to expose at least the antenna connector.   A protrusion formed on the outside of the side wall of the chassis to which the antenna connector is attached, and a concave groove formed on the inside of the side wall of the front case opposite to the side wall of the chassis to engage with the protrusion. The portable wireless device according to claim 1 or 2, wherein the chassis and the front case are coupled by both engagement of the protrusion and the groove and screwing with a screw. Portable radio apparatus according to any one of claims 1 to 3, further comprising a conductive layer on the entire inner surface including a side wall of the front case.

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