JP2008252718A - Radio terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio terminal in which a ground conductor of an antenna and a case are electrically connected without fail while ensuring waterproofing performance and even in a case where external power is operated upon the antenna, the case is hardly damaged. <P>SOLUTION: A radio terminal comprises a fitting metal (13) to which a ground conductor (lock portion 10b or the like) of an antenna connector (10) is fitted, a metallic chassis (2) onto which the fitting metal (13) is mounted, and an O ring (14) interposed between the fitting metal (13) and the chassis (2). At the same time, at the chassis (2), a fitting metal contact part (15d) is formed which is brought into contact with the fitting metal (13) when the fitting metal (13) is mounted onto the chassis (2). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless terminal that transmits and receives wireless signals.

When securing the waterproof performance of a wireless terminal, it is common to insert packing made of an elastic body between a plurality of casing pieces (chassis, cover, case, etc.) constituting the casing (for example, patents) Reference 1). Further, an antenna as shown in FIG. 3 of Patent Document 2, for example, is usually attached to the wireless terminal.
Japanese Patent Laid-Open No. 9-23072 JP 2000-183779 A

  When the antenna is attached to the wireless terminal, the ground conductor of the antenna is fixed to the metal part of the wireless terminal casing and grounded. On the other hand, in order to ensure the waterproof performance of the wireless terminal, it is necessary to insert a sealing material such as an O-ring between the antenna and the housing. Therefore, when the waterproof performance of the wireless terminal is ensured, there is a problem that it is difficult to electrically connect the ground conductor and the housing.

  In addition, when an external force is applied to the antenna, the impact is directly transmitted to the housing to which the antenna is fixed, which causes a problem that the housing is easily damaged.

  Accordingly, the object of the present invention is to solve the above-mentioned problems, and to ensure a waterproof performance while electrically connecting between the ground conductor of the antenna and the housing, and to apply an external force to the antenna. Another object of the present invention is to provide a wireless terminal in which the casing is not easily damaged.

  In order to solve the above-described problem, in the wireless terminal according to the present invention, an antenna connector having a center conductor and a ground conductor disposed on the outer periphery thereof, a mounting bracket to which the ground conductor of the antenna connector is attached, A metal casing piece to which the mounting bracket is attached; and a seal member interposed between the mounting bracket and the casing piece. The casing piece includes the mounting bracket on the casing. An attachment fitting contact portion that contacts the attachment fitting when attached to the piece is formed.

  In the wireless terminal according to the present invention, an antenna connector having a center conductor and a ground conductor disposed on the outer periphery thereof, a mounting bracket to which the ground conductor of the antenna connector is mounted, and a metal to which the mounting bracket is mounted And a sealing material interposed between the mounting bracket and the casing piece, and the casing piece includes the mounting bracket when the mounting bracket is attached to the casing piece. Since the mounting bracket contact portion that contacts the mounting bracket is formed, the ground conductor of the antenna and the housing can be electrically and reliably connected while ensuring the waterproof performance.

  In addition, since the antenna connector is connected to the casing piece via the mounting bracket, even if an external force acts on the antenna, the impact transmitted to the casing piece is mitigated by the mounting bracket. The housing can be made difficult to break.

  The best mode for carrying out a wireless terminal according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a wireless terminal according to the present invention. In FIG. 1, reference numeral 1 denotes a wireless terminal that transmits and receives wireless signals. The housing of the wireless terminal 1 includes a metal chassis (housing piece) 2, a resin front cover 3 attached to the front surface side of the chassis 2, and a resin upper surface cover 4 attached to the upper surface side of the chassis 2. It consists of. Further, a battery 5 for supplying power is attached to the chassis 2. By assembling the front cover 3, the upper cover 4, and the battery 5 to the chassis 2, a main body portion of the wireless terminal 1 that has a substantially rectangular parallelepiped shape as a whole is configured. An antenna 6 (only part of which is shown in FIG. 1) is attached to the upper part of the wireless terminal 1. The front cover 3 is formed with an opening in which various indicators, connectors and the like are arranged, but the illustration is omitted.

  The antenna 6 includes an antenna connector 10 attached to the chassis 2 and an antenna body 11 connected to the antenna connector 10. The antenna 6 is a λ / 4 monopole antenna.

  First, attachment of the antenna connector 10 to the chassis 2 will be described. FIG. 2 is an exploded perspective view showing a mounting structure of the antenna connector 10 to the chassis 2. As illustrated, the antenna connector 10 is attached to the chassis 2 using a packing 12, a mounting bracket 13, and an O-ring 14.

  FIG. 3 is an enlarged perspective view of the antenna connector 10. As shown in FIG. 3, the antenna connector 10 has a substantially cylindrical shape, and a central conductor 10a is disposed on the central axis thereof. Around the center conductor 10a, there are an engaging portion 10b formed on the bottom surface, a cylindrical portion 10c formed on the upper portion of the engaging portion 10b, a screw portion 10d formed on the upper portion of the cylindrical portion 10c, and an upper portion of the screw portion 10d. The antenna main body connecting portion 10e formed in the above is formed. The locking portion 10b, the cylindrical portion 10c, the screw portion 10d, and the antenna body connection portion 10e are made of metal and function as a ground conductor for the antenna connector 10.

  As for the latching | locking part 10b, let the planar shape be the shape which cut off the inferior arc which opposes from the periphery. That is, the locking portion 10b has a major axis direction and a minor axis direction. The cylindrical portion 10c has a cylindrical shape having the same or substantially the same diameter as the length in the minor axis direction of the locking portion 10b. In other words, a part (major axis direction) of the locking portion 10b is wider than the cylindrical portion 10c. This widened portion is called a widened portion 10f.

  The threaded portion 10d has a circular shape with a bottom that is larger in diameter than the cylindrical portion 10c, and a threaded groove (not shown) is formed on the upper portion of the cylindrical portion. The portion where the thread groove is formed has a planar shape obtained by cutting out an inferior arc facing from the circumference (the diameter is the same as the bottom). The antenna main body connection portion 10e is formed in a cylindrical shape (substantially cylindrical shape) that is smaller in diameter than the screw portion 10d. A plurality of convex portions 10f are formed in the antenna main body connecting portion 10e, and the antenna main body 11 is locked to the convex portions 10f.

  FIG. 4 is an enlarged plan view of the mounting bracket 13. As shown in FIGS. 2 and 4, the mounting bracket 13 is formed from a plate-like member (for example, made of stainless steel or iron) having a substantially rectangular shape in plan view. Screw holes 13 a are formed in the vicinity of both ends in the longitudinal direction of the mounting bracket 13. Further, the central portion of the mounting bracket 13 is widened in an arc shape, and a hole 13b is formed. The hole 13 b has the same shape as the locking portion 10 b of the antenna connector 10.

  FIG. 5 is a top view of the chassis 2. A mounting bracket fixing portion 15 is formed on the upper surface of the chassis 2. As shown in FIGS. 2 and 5, the mounting bracket fixing portion 15 is formed by making a part of the upper surface of the chassis 2 concave, and the shape thereof is the same as that of the mounting bracket 13 (specifically, the mounting bracket 13 Slightly larger shape). Specifically, the mounting bracket fixing portion 15 has a substantially rectangular shape in plan view, and screw holes 15a are formed in the vicinity of both ends in the longitudinal direction. Further, the central portion of the mounting bracket fixing portion 15 is widened in an arc shape, and a hole 15b is formed.

  6 is an enlarged sectional view taken along line VI-VI in FIG. As shown in FIGS. 5 and 6, an O-ring arrangement portion 15c in which the O-ring 14 is arranged is formed around the hole 15b. Furthermore, a mounting bracket contact portion 15 d is formed on the wall surface of the mounting bracket fixing portion 15. The mounting bracket contact portion 15d is made of R (curved surface) connecting the wall surface and the bottom surface of the mounting bracket fixing portion 15. In FIG. 6 and FIG. 7 described later, the attachment fitting contact portion 15d is exaggerated for convenience of explanation. In practice, the mounting bracket contact portion 15d may be a smaller R.

  FIG. 7 is a cross-sectional view showing a state where the antenna connector 10 is attached to the chassis 2. The attachment of the antenna connector 10 to the chassis 2 will be described with reference to FIGS. 2 and 7. First, the O-ring 14 is arranged on the O-ring arrangement portion 15 c formed on the mounting bracket fixing portion 15 of the chassis 2. Next, the mounting bracket 13 is disposed on the O-ring 14, and the mounting bracket 13 and the chassis 2 are fastened while the O-ring 14 is crushed by screwing the screw 16 into the screw hole 13a and the screw hole 15a. At this time, the lower surface edge of the mounting bracket 13 contacts the mounting bracket contact portion 15 d of the mounting bracket fixing portion 15.

  Next, the locking portion 10 b of the antenna connector 10 is inserted into the hole 13 b of the mounting bracket 13. A packing 12 is attached to the cylindrical portion 10 c of the antenna connector 10. With the locking portion 10b inserted into the hole 13b, the antenna connector 10 is rotated by 90 degrees around its central axis while crushing the packing 12, so that the widened portion 10f of the locking portion 10b becomes the lower surface of the mounting bracket 13. Locked in contact with. As a result, the antenna connector 10 is fixed to the mounting bracket 13 and thus fixed to the chassis 2. Although not shown, the center conductor 10 a of the antenna connector 10 is connected to an electronic circuit board mounted on the chassis 2.

  As described above, the lower surface edge portion of the mounting bracket 13 contacts the mounting bracket contact portion 15 d of the mounting bracket fixing portion 15. Further, the locking portion 10 b (the widened portion 10 f) is in contact with the lower surface of the mounting bracket 13. Therefore, the ground conductor of the antenna connector 10 is electrically and reliably connected to the metal chassis 2. That is, the ground conductor of the antenna connector 10 is securely grounded. A waterproofing performance is secured between the antenna connector 10 and the mounting bracket 13 with a packing 12 and between the mounting bracket 13 and the chassis 2 with an O-ring 14.

  FIG. 8 is an exploded perspective view showing a structure for attaching the antenna body 11 to the antenna connector 10. As illustrated, the antenna body 11 is attached to the antenna connector 10 using a plate 20, a nut 21, and a cap 22. A hole 20a is formed in the plate 20.

  FIG. 9 is a top view of the top cover 4. As shown in FIG. 9, a hole 4 a is formed on the upper surface of the upper cover 4. A plate arrangement portion 4b having the same shape as the plate 20 is formed around the hole 4a.

  The mounting of the antenna body 11 to the antenna connector 10 will be described with reference to FIGS. 1, 8, and 9. First, with the mounting bracket 13 attached to the chassis 2, the side surface of the top cover 4 and the chassis 2 are screwed. The upper surface cover 4 is attached to the chassis 2 by fastening with 23. Next, the antenna connector 10 is inserted into the hole 4 a of the top cover 4 and the antenna connector 10 is attached to the mounting bracket 13. At this time, a part of the screw portion 10d and the antenna body connection portion 10e of the antenna connector 10 protrude upward from the hole 4a. The top cover 4 may be attached to the chassis 2 after the antenna connector 10 is attached to the mounting bracket 13 (chassis 2).

  Next, the plate 20 is placed in the plate placement portion 4 b of the upper surface cover 4 while the antenna connector 10 is inserted through the hole 20 a of the plate 20, and the nut 21 is screwed into the screw portion 10 d of the antenna connector 10. Thereby, the antenna connector 10 is positioned with respect to the upper surface cover 4 and the upper surface of the upper surface cover 4 is fixed to the chassis 2.

  Next, the antenna body 11 is connected to the antenna connector 10 (antenna body connection portion 10e). Specifically, the convex portion 10f of the antenna main body connecting portion 10e described above is locked in a concave portion (not shown) formed inside the antenna main body 11. A cap 22 made of an elastic material such as a rubber material is inserted between the antenna main body 11 and the upper surface cover 4, and waterproof performance between the antenna 6 and the upper surface cover 4 is ensured.

  As described above, in the wireless terminal 1 according to the present invention, the mounting bracket 13 to which the ground conductor (the locking portion 10b or the like) of the antenna connector 10 is attached, the metal chassis 2 to which the mounting bracket 13 is attached, An O-ring 14 (seal material) interposed between the mounting bracket 13 and the chassis 2 is provided, and the mounting bracket 13 is mounted on the chassis 2 (specifically, the mounting bracket fixing portion 15 formed on the chassis 2). Since the mounting bracket contact portion 15d that contacts the mounting bracket 13 when formed on the chassis 2 is formed, an electrical connection between the ground conductor of the antenna 6 and the chassis 2 is ensured while ensuring waterproof performance. Can be securely connected.

  Further, since the antenna connector 10 is configured to be connected to the chassis 2 via the mounting bracket 13, even if an external force acts on the antenna 6, the impact transmitted to the chassis 2 is mitigated by the mounting bracket 13. As a result, the chassis 2 can be made difficult to break.

  In the above-described embodiment, the attachment fitting contact portion 15d is a curved surface (R shape), but may be another shape such as a protruding flat surface.

It is a perspective view of the radio | wireless terminal which concerns on this invention. It is a disassembled perspective view showing the attachment structure of the antenna connector to the chassis shown in FIG. FIG. 3 is an enlarged perspective view of the antenna connector shown in FIG. 2. FIG. 3 is an enlarged plan view of the mounting bracket shown in FIG. 2. FIG. 3 is a top view of the chassis shown in FIG. 2. FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5. It is sectional drawing which shows the state which attached the antenna connector to the chassis shown in FIG. It is a disassembled perspective view showing the attachment structure of the antenna main body to the antenna connector shown in FIG. It is a top view of the upper surface cover shown in FIG.

Explanation of symbols

1: wireless terminal, 2: chassis (casing piece), 6: antenna, 10: antenna connector, 10b to 10e: ground conductor, 11: antenna body, 13: mounting bracket, 14: O-ring (seal material), 15d : Mounting bracket contact area

Claims (1)

In a wireless terminal that transmits and receives wireless signals,
An antenna connector having a center conductor and a ground conductor disposed on the outer periphery thereof;
A mounting bracket to which the ground conductor of the antenna connector is mounted;
A metal casing piece to which the mounting bracket is attached;
A sealing material inserted between the mounting bracket and the housing piece;
And a mounting bracket contact portion that contacts the mounting bracket when the mounting bracket is mounted on the casing piece.