JP4577224B2 - Wireless device - Google Patents

Description

  The present invention relates to a radio apparatus, and more particularly to a radio apparatus having a configuration in which a planar antenna and a radio circuit unit are incorporated in a rectangular case.

A conventional wireless device has a configuration in which a planar antenna and a wireless circuit unit are incorporated in a rectangular case.
JP 2000-196259 A Japanese Patent Laid-Open No. 11-204973

  The wireless circuit unit incorporates electronic components that generate heat, and requires a structure that can dissipate heat when the wireless device is assembled.

  It is desirable that the operation of assembling the wireless device is easy and a structure that can dissipate heat in the assembled state is stably formed.

  Accordingly, an object of the present invention is to provide a wireless device that solves the above-described problems.

In the present invention, the first member (90) and the second member (100) are combined to form the case (10), and the wireless circuit unit (40) is accommodated inside the case. In a wireless device,
Inside the first member, there is a wireless circuit unit temporary placement portion (21) for temporarily placing the wireless circuit unit when the wireless device is assembled.
In the position where the wireless circuit unit is lifted from the wireless circuit unit temporary storage part, the second circuit (100) passes through the hole (104) of the second member (100) from the outside of the case. The structure is fixed to the inner surface (100a) of the member (100).

  According to the present invention, the radio circuit unit is configured to be fixed to the inner surface of the second member by the screw that has passed through the hole of the second member from the outside of the case at the position of the radio circuit unit temporary storage portion. Therefore, the wireless circuit unit is in close contact with the second member, and the heat generated in the wireless circuit unit can be radiated through the second member.

  Moreover, since the wireless circuit unit is fixed to the inner surface of the second member at the position of the wireless circuit unit temporary storage portion, the wireless circuit unit is tightened from the outside of the case through the hole of the second member. The work of fixing to the inner surface of the second member can be easily performed, and the assemblability is good.

  When the wireless circuit unit is attached and then the second member is fixed to the first member so as to cover the wireless circuit unit, the wireless circuit unit and the second member are brought into close contact with each other. The accuracy of the mounting position is required. In addition, it is difficult to ensure that the wireless circuit unit and the second member are in close contact with each other.

  However, since the wireless circuit unit is configured to be fixed to the inner surface of the second member by a screw passing through the hole of the second member from the outside of the case at the position of the wireless circuit unit temporary storage portion, It is possible to ensure that the radio circuit unit and the second member are in close contact with all assembled products without specially increasing the accuracy and accuracy of component mounting positions.

  Next, an embodiment of the present invention will be described.

Figure 1 shows a state in which the wireless device 1 according to a first embodiment viewed through the and case in a posture looking up from below of the present invention. FIG. 2 shows the wireless device 1 in an exploded manner. FIG. 3 schematically shows a cross section of the wireless device 1. X1-X2 is the horizontal direction, Y1-Y2 is the vertical direction, and Z1-Z2 is the height direction. When viewed from the center of the wireless device 1, Z1 is the antenna 30 side, and Z2 is the wireless circuit unit 40 side.

In the wireless device 1, the inside of the case 10 is partitioned into a space 11 on the Z1 side and a space 12 on the Z2 side by a shield plate member 20 made of a metal plate, and a planar antenna 30 is provided in the Z1 side space 11. A wireless circuit unit 40 and a printed circuit board assembly 60 are provided in the Z2 side space 12, and the wireless circuit unit 40 and the printed circuit board assembly 60 are connected by a flexible printed cable 70. The antenna 30 and the radio circuit unit 40 are connected by a coaxial cable 80, and the heat of the radio circuit unit 40 is radiated from the bottom plate member 100 of the case 10.
[Case 10]
The case 10 is a synthetic resin molded part, and includes a box-shaped case member 90 and an aluminum plate bottom plate member 100 that closes the Z2 side opening of the case member 90.

  The bottom plate member 100 is fixed to the case member 90 by screwing each corner portion to the case member 90 with screws 101.

  The bottom plate member 100 has protrusions 102 and 103 protruding in the Z1 direction from the inner surface 100a side, that is, the inner surface 100a (see FIG. 6), and is wirelessly placed on the wireless circuit unit temporary placement portion 21 described later. A hole 104 through which the screw 110 passes is provided at a position corresponding to the female screw portion 41X1c, 41X2c, 42X1c, 42X2c of the circuit unit 40.

The bottom plate member 100 is a plate to which the radio circuit unit 40 is fixed, and also functions as a heat radiating plate.
[Antenna 30]
The antenna 30 is fixed to the case member 2 by screwing, and is disposed in parallel with the front surface of the case 10.
[Shield plate member 20]
The shield plate member 20 has a radio circuit unit temporary placement portion 21 formed on the Z2 surface side. The wireless circuit unit temporary placement portion 21 is a portion for temporarily placing the wireless circuit unit 40 when the wireless device 1 is assembled, and is formed by bending or cutting a part of the shield plate member 20 in the Z2 direction. It consists of two lugs 22-25.

  As shown in an enlarged view in FIG. 5, the four lugs 22 to 25 are arranged so as to correspond to the respective corners of the radio circuit unit 40 to be incorporated. X and Y are lines passing through the center of the wireless circuit unit temporary storage unit 21, respectively.

  The lugs 22 and 23 and the lugs 24 and 25 are arranged symmetrically with respect to the line X, and the lugs 22 and 24 and the lugs 23 and 25 are arranged symmetrically with respect to the line Y.

  The surfaces of the lugs 22 to 25 are parallel to the XZ plane. Each lug 22-25 is substantially L-shaped, and has horizontal portions 22a-25a and vertical portions 22b-25b. The lug 22 and lug 23 face each other, and the lug 24 and lug 25 face each other. In the lugs 22 and 24, the horizontal portions 22a and 25a are positioned on the side close to the line X, the vertical portions 22b and 25b are positioned on the side farther from the line X, and the L-shape faces inward. Similarly, the lug 22 and lug 24 are such that the horizontal portions 22a and 25a are positioned on the side closer to the line X, the vertical portions 22b and 25b are positioned on the side farther from the line X, and the L-shape faces inward. .

  As shown in FIG. 3, the shield plate member 20 is housed in the case member 90, and each corner portion is screwed to the case member 90 with a screw 26 and fixed to the case member 90.

Similarly, as shown in FIG. 3, the shield plate member 20 and the bottom plate member 100 are such that the distance S in the Z direction between the horizontal portions 22 a to 25 a of the lugs 22 to 25 and the bottom plate member 100 is the height of the wireless circuit unit 40. It is arranged so that it is slightly larger than the thickness (thickness) H.
[Radio circuit unit 40]
As shown particularly in FIGS. 5 and 6, the radio circuit unit 40 includes beam portions 41 and 42 extending in parallel to the X1-X2 direction and a beam portion 43 connecting the beam portions 41 and 42. , 44, a wireless circuit printed circuit board module 46 incorporated therein, a Z1 side cover member 47Z1 attached to the frame 45 and covering the wireless circuit printed circuit board module 46, and This is composed of a Z2 side cover member 47Z2. The radio circuit printed circuit board module 46 constitutes a radio circuit.

  The wireless circuit printed circuit board module 46, the frame portion 45 surrounding the wireless circuit printed circuit board module 46, and cover members 47 </ b> Z <b> 1 and 47 </ b> Z <b> 2 that cover the wireless circuit printed circuit board module 46 constitute a unit main body 48. That is, the unit main body 48 is configured by a box body 49 including a rectangular frame portion 45 and upper and lower cover members 47Z1 and 47Z2, and a wireless circuit printed circuit board module 46 in the box body 49.

  The portions on both end sides of the beam portions 41 and 42 protrude from the unit main body 48 in the X1-X2 direction. The overhang portions 41X1, 41X2, 42X1, and 42X2 have a width W2 that is narrower than the width W1 of the beam portions 41 and 42 by cutting the edges of the beam portions 41 and 42 on the Z1 side. That is, the surface of the unit body 48 on the Z1 side protrudes from the edges 41X1a, 41X2a, 42X1a, 42X2a on the Z1 side of the projecting portions 41X1, 41X2, 42X1, and 42X2 by a dimension a. Reference numeral 48 a denotes a protruding portion of the unit main body 48.

  The overhang portions 41X1 to 42X2 include lugs 41X1b, 41X2b, 42X1b, and 42X2b formed by bending the Z2 side toward the unit main body 48. The lugs 41X1b to 42X2b have female screw portions 41X1c, 41X2c, 42X1c, and 42X2c.

  As shown in FIG. 6, the wireless circuit printed circuit board module 46 has a configuration in which a plurality of electronic components are mounted on a printed circuit board 50.

  Reference numerals 51 and 52 denote electronic components that generate a large amount of heat, and are mounted on the surface of the printed circuit board 50 on the Z1 side.

  Of the surface on the Z2 side of the printed circuit board 50, the region corresponding to the electronic components 51 and 52 is a region where no electronic components are mounted. In this portion, the heat dissipation sheets 53 and 54 made of silicone are provided. is stuck on.

  Opening windows 47Z2a and 47Z2b are formed in portions of the cover member 47Z2 corresponding to the heat dissipation sheets 53 and 54 described above.

  The dimension A in the Z direction between the lugs 41X1b to 42X2b and the heat radiation sheets 53 and 54 is determined with high accuracy.

  Further, the protruding dimension B of the protrusions 102 and 103 of the bottom plate member 100 is also determined with high accuracy.

  The wireless circuit unit 40 having the above-described configuration is located in the wireless circuit unit temporary storage part 21, and is inserted from the Z2 side of the bottom plate member 100 through the hole 104 of the bottom plate member 100 and screwed into the female screw portions 41X1c, 41X2c, 42X1c, 42X2c. The four screws 110 are fixed to the Z2 surface of the bottom plate member 100.

  The protrusions 102 and 103 are in the opening windows 47Z2a and 47Z2b, and the tip surfaces of the protrusions 102 and 103 are pressed against and closely contact the heat dissipation sheets 53 and 54.

  A coaxial cable 80 extending from the antenna 30 passes through the hole 29 of the shield plate member 20 and reaches the space 12 on the Z2 side, and is connected to the radio circuit unit 40.

The wireless circuit unit 40 and the printed circuit board assembly 60 are connected by a flexible printed cable 70.
[Printed circuit board assembly 60]
The printed circuit board assembly 60 has a configuration in which a plurality of electronic components are mounted on a printed circuit board 61, and is screwed to the Z2 side surface of the shield plate member 20.
[Assembly of wireless device 1]
As shown in FIGS. 7A to 7D, the wireless device 1 has a posture in which the case member 90 is downward and the bottom plate member 100 is upward, that is, the case member 90 is in a posture in which the opening is directed upward. The parts are assembled in the case member 90 in order.

Radio circuit unit 40 placed temporarily in a radio circuit unit temporary rest portion 21, after attaching a bottom plate member 100, I by the Rukoto tighten the screw through the screw from the Z 2 side, the wireless circuit unit temporary rest portion 21 is fixed to the inner surface 100a of the bottom plate member 100 is raised Ri small and suspended from.

FIG. 7A shows a state in which the antenna 30 is attached to the inside of the case member 90, the shield plate member 20 is attached, and the printed circuit board assembly 60 is attached on the shield plate member 20. The radio circuit unit temporary rest portion 21 are oriented in Z 2 side. A coaxial cable 80 extending from the antenna 30 passes through the hole 29 and reaches the wireless circuit unit temporary placement portion 21. A flexible printed cable 70 extends from the printed circuit board assembly 60.

Then, as shown in FIG. 7 (B), as well as connecting the coaxial cable 80 and the flexible print cable 70 to a radio circuit unit 40, a wireless circuit unit 40, in a posture in which the opening window 47Z2a, 47Z2b is facing Z 2 side Then, the wireless circuit unit is placed in the temporary placement unit 21.

  Since the wireless circuit unit 40 is exposed, the operator's fingertip can easily access the connector of the wireless circuit unit 40. Therefore, the coaxial cable 80 and the flexible printed cable 70 do not need to be particularly long. Therefore, the signal transmission characteristics do not deteriorate. Moreover, the state where the coaxial cable 80 and the flexible printed cable 70 are sandwiched between the radio circuit unit 40 and the shield plate member 20 is not overlooked.

  As illustrated in FIG. 9, the wireless circuit unit 40 is temporarily placed with the overhang portions 41X1, 41X2, 42X1, and 42X2 supported by the lugs 23, 25, 22, and 24, respectively. Specifically, the overhang portions 41X1, 41X2, 42X1, and 42X2 are supported by the horizontal portions 23a, 25a, 22a, and 24a, and the movement in the Y1-Y2 direction is restricted by the vertical portions 22b to 25b, and the horizontal portion 23a. , 25a, 22a, 24a are constrained to move in the Y1-Y2 direction by facing part of the X1, X2 side surface of the unit main body 48 (box body 49).

  Next, as shown in FIG. 7C, the bottom plate member 100 is screwed and attached to the case member 90 so as to cover the radio circuit unit 40 and the printed circuit board assembly 60 so as to close the opening of the case member 90. . In this state, the radio circuit unit 40 is accommodated in the radio circuit unit temporary storage unit 21. The inner surface 100 a of the bottom plate member 100 faces the radio circuit unit 40.

Finally, as shown in FIG. 7D, the screw 110 is inserted from above through the hole 104 of the bottom plate member 100 and tightened. The screw 110 that has passed through the hole 104 of the bottom plate member 100 reaches the female screw portion 41X1c, 41X2c, 42X1c, 42X2c. When the screw 110 is tightened, the screw 110 is screwed into the female screw portion 41X1c, 41X2c, 42X1c, 42X2c. Therefore, the wireless circuit unit 40, as shown in FIG. 8, are fixed and raised Ri suspended and small from the wireless circuit unit temporary placing portion 21 on the inner surface 100a of the bottom plate member 100. Thereby, the assembly of the wireless device 1 is completed.

More specifically, with the bottom plate member 100 attached, as shown in FIG. 10, the projecting portions 102 and 103 enter the opening windows 47Z2a and 47Z2b. Tighten the screws 110, when it is fixed to the inner surface 100a of the bottom plate member 100 of the wireless circuit unit 40 from the wireless circuit unit temporary placing portion 21 raised Ri suspended and small, as shown in FIG. 11, the heat radiation sheet 53 The protrusions 102 and 103 are pressed against the tip surfaces and come into close contact therewith. In FIGS. 10 and 11, the lugs are shown in different directions for convenience of illustration.

  Here, when the radio circuit unit 40 is attached to the shield plate member 20, the lugs 41X1b to 42X2b and the heat dissipation are used in order to make the tip surfaces of the protrusions 102 and 103 and the heat dissipation sheets 53 and 54 come into close contact with each other. In addition to the dimension A in the Z direction with the sheets 53 and 54 and the protruding dimension B (see FIG. 6) of the protrusions 102 and 103 of the bottom plate member 100, the mounting position of the shield plate member 20 to the case member 90, the bottom plate It is necessary to determine the attachment position of the member 100 to the case member 90 with high accuracy, and dimensional management of each component becomes troublesome. However, in the structure in which the wireless circuit unit 40 is attached to the bottom plate member 100 as in the present embodiment, the accuracy of the attachment positions of the shield plate member 20 and the bottom plate member 100 to the case member 90 is different from that of the protrusions 102 and 103. The degree of contact between the sheets 53 and 54 is not affected, and the degree of contact between the protrusions 102 and 103 and the heat radiation sheets 53 and 54 is determined solely by the dimensions A and B, and this dimension A , B are determined with high accuracy. For this reason, the degree of close contact between the protrusions 102 and 103 and the heat radiation sheets 53 and 54 is substantially constant without variation for each completed body as compared with the configuration in which the wireless circuit unit 40 is attached to the shield plate member 20.

  Further, when the wireless circuit unit 40 is attached to the bottom plate member 100 from the beginning, it is necessary to make the coaxial cable longer than usual. For this reason, first, there is a possibility that the signal transmission path between the antenna 30 and the radio circuit unit 40 becomes long and the characteristics are deteriorated. Secondly, when a long coaxial cable is stored inside the wireless device, the coaxial cable may be sandwiched between the wireless circuit unit and the shield plate member. If the coaxial cable is sandwiched, the coaxial cable may be damaged.

  However, in this embodiment, since the radio circuit unit 40 is placed on the radio circuit unit temporary placement portion 21 and then attached to the bottom plate member 100, the coaxial cable 80 is short, and the coaxial cable 80 is connected to the radio circuit unit 40. There is no fear of being sandwiched between the shield plate member 20 and between the radio circuit unit 40 and the bottom plate member 100.

  The wireless device 1 is used in a posture that is upside down from the posture at the time of assembly, and the heat generated by the electronic components 51 and 52 is conducted to the protrusions 102 and 103 through the printed circuit board 50 and the heat radiation sheets 53 and 54. Then, it is conducted so as to spread to the bottom plate member 100, and is radiated from the surface (outer surface) of the bottom plate member 100 to the air outside the wireless device 1.

  The first member in the claims corresponds to the case member 90 of the embodiment, and the second member in the claims corresponds to the bottom plate member 100 of the embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a wireless device according to a first embodiment of the present invention in a posture looking up from below and through a case. It is a perspective view which decomposes | disassembles and shows the radio | wireless apparatus of FIG. It is a figure which shows the radio | wireless apparatus of FIG. 1 in cross section and roughly. FIG. 4 is a diagram showing in detail a fixed state of the wireless circuit unit to the bottom plate member in FIG. 3. FIG. 3 is an enlarged view showing a wireless circuit unit temporary storage unit and a wireless circuit unit in FIG. 2. It is a figure which shows a radio | wireless circuit unit and a baseplate member correspondingly in detail. It is a figure explaining the assembly of a radio | wireless apparatus. It is a figure which shows the state which the assembly of the radio | wireless apparatus was completed. FIG. 8B is a diagram illustrating a state in which the wireless circuit unit illustrated in FIG. 7B is temporarily placed on the wireless circuit unit temporary placement unit. It is a figure which shows the state shown in FIG.7 (D) in detail. It is a figure which shows the state shown in FIG. 8 in detail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio | wireless apparatus 10 Case 11 Z1 side space 12 Z2 side space 20 Shield plate member 21 Wireless circuit unit temporary storage part 22-25 Lug 22a-25a Horizontal part 22b-25b Vertical part 30 Antenna 40 Radio circuit unit 41,42,43, 44 Beam part 41X1-42X2 Overhang part 41X1b-42X2b Lug 41X1c-42X2c Female thread part 45 Frame part 46 Wireless circuit printed circuit board module 47Z1, 47Z2 Cover member 47Z2a, 47Z2b Open window 48 Unit main body 49 Box body 50 Electronic circuit board 51, 52 Parts 53, 54 Heat dissipation sheet 60 Printed circuit board assembly 70 Flexible printed cable 80 Coaxial cable 90 Case member 100 Bottom plate member 102, 103 Protrusion 104 Hole 110 Screw

Claims (5)

In the wireless device having a configuration in which the first member and the second member are combined to form a case, and the wireless circuit unit is accommodated inside the case.
Inside the first member, there is a wireless circuit unit temporary placement part for temporarily placing the wireless circuit unit when the wireless device is assembled.
The wireless circuit unit is configured to be fixed to the inner surface of the second member by a screw passing through a hole of the second member from the outside of the case at a position lifted from the wireless circuit unit temporary storage portion. A wireless device characterized by that. The wireless device according to claim 1, wherein
A shield plate member fixed inside the first member and partitioning the inside of the case;
The wireless circuit unit temporary storage portion is formed by cutting and raising the shield plate member, and includes a plurality of cut and raised pieces arranged to support the wireless circuit unit. apparatus. The wireless device according to claim 1, wherein
The wireless circuit unit includes a box having an opening window, and a configuration in which electronic components are mounted on a printed circuit board, and includes a wireless circuit printed board module housed in the box, and heat dissipation. The sheet is a configuration pasted on a portion of the printed circuit board of the wireless circuit printed board module facing the opening window,
The second member has a shape having a protrusion protruding into the case at a portion corresponding to the opening window of the box,
In a state where the wireless circuit unit is fixed to the inner surface of the second member by a screw passing through the hole of the second member from the outside of the case, the protrusion of the second member opens the opening window . A wireless device characterized in that the wireless device passes through the wireless circuit unit and is pressed against the heat dissipation sheet. A synthetic resin molded part that combines a box-shaped case member and a metal plate bottom plate member to form a case,
An antenna is fixed to the back of the case member,
In the case member, a shield plate member made of a metal plate is fixed so as to cover the antenna,
A radio circuit unit and a printed circuit board assembly are provided on the opposite side of the shield plate member from the antenna,
In the wireless device configured to cover the wireless circuit unit with the bottom plate member,
The shield plate member has a wireless circuit unit temporary placement portion for temporarily placing the wireless circuit unit on the side facing the bottom plate member,
The wireless circuit unit is configured to be fixed to the inner surface of the bottom plate member with a screw passing through a hole in the bottom plate member from the outside of the case at a position lifted from the wireless circuit unit temporary storage portion. A wireless device characterized. The wireless device according to claim 4, wherein
The wireless circuit unit includes a box having an opening window, and a configuration in which electronic components are mounted on a printed circuit board, and includes a wireless circuit printed board module housed in the box, and heat dissipation. The sheet is a configuration pasted on a portion of the printed circuit board of the wireless circuit printed board module facing the opening window,
The bottom plate member has a shape having a protrusion protruding into the case at a portion corresponding to the opening window of the box,
In a state where the wireless circuit unit is fixed to the inner surface of the bottom plate member, the protrusion of the bottom plate member enters the wireless circuit unit through the opening window and is pressed against the heat dissipation sheet; A wireless device characterized by that.

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