JP2006210787A - Waterproof construction of portable radio unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable radio unit in which an assembling operation of a waterproof structure is facilitated, also, a disadvantage due to variations when assembling a packing material does not occur, and a waterproof performance is extremely high. <P>SOLUTION: A circuit member and a connector 28 are attached to a chassis 14 to be joined to an upper face panel 12. In addition, packing materials 33, 34 are attached to a fitting end on the opening 10 of the lower case 11 of the upper face panel 12 and the entire periphery of the connector 28 of the chassis 14. The chassis 14 is fitted into the lower case 11 from a fit-in end 26, and a screw 35 is inserted into the fitted-in chassis 14 via an O ring 19 from the insertion hole 18 of the bottom face 15 of the lower case 11, so that the screw 35 is threaded to a screw hole 29 of the chassis 14 to be fastened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to a waterproof structure for a hand-held portable radio device.

  Handy-type portable radios used for light duty in disaster prevention, construction sites, leisure, etc. (for example, communication between heavy equipment operators and workers at construction sites, and hands-free communication at equipment operators or customer service) The specific low-power transceivers such as are often used under harsh conditions, and therefore require excellent waterproof performance.

  Therefore, as one method of giving airtightness to the fitting portion of the case, for example, a base is molded using a resin material such as polycarbonate as a primary molding material, and a mating material that requires at least airtightness on the surface of the primary molding product A double-molded product using a resin material such as a soft thermoplastic polyester elastomer is employed as a secondary molding material for the waterproof line (joint portion).

  However, the method of using an elastomer for the waterproof line eliminates the need for packing because the sealing material is fixed to the case alone, and has the effect of reducing the assembly man-hours. It is difficult to adjust the accompanying dimensional deviation. For example, it is used as a waterproof structure of JIS protection class 7 immersion type (the bottom of the case is 1 m below the surface of the water and immersed in water for 30 minutes without water entering it). There was a problem that could not be done.

  As a method for solving such a problem, it is conceivable to improve the packing performance. The conventional packing is, for example, as shown in FIG. 5A shown in (Patent Document 1).

That is, in this case, the case is constituted by a front case 1a and a rear case 1b, a groove is formed in the entire circumference of the fitting surface of the front and rear case 1a, 1b, and a rubber packing material 2 is formed in the groove. It fits in. At this time, as shown in FIG. 5B, the shape of the groove 3 is deformed or the rib 4 is provided on the packing material 2 to improve the waterproof performance.
Japanese Patent Laid-Open No. 10-70375

  However, as described above, in the method of forming the groove on the entire circumference of the mating surface of the front and rear case and fitting the packing material, the packing material is mounted in a predetermined position over the entire circumference of the case, assembled and sealed. Since the operation has to be performed, it is necessary to perform extremely complicated and detailed assembly work. Therefore, there is a problem that variations are easily caused when the packing material is assembled.

  Accordingly, an object of the present invention is to facilitate the assembling work of the waterproof structure of the portable wireless device, to prevent a problem due to variations in assembling the packing material, and to extremely enhance the waterproof performance.

  In order to solve the above problems, the present invention comprises a lower case having an upper opening, a case main body made of a lid member fitted into the opening, and a chassis fitted into the case main body through the opening, The lower case is provided with a connector projection and a screw insertion hole on the bottom surface, while the chassis is provided with a mounting portion for holding a circuit member, and the lower case is provided at a fitting end into the opening. An engaging part is provided with a screw hole communicating with a connector inserted into the projecting opening of the screw and a screw insertion hole of the lower case, and a locking part joined with the lid member is provided at the other end. A circuit member and a connector are attached to the chassis and joined to the lid member, and a packing material for water stop is attached to a fitting end of the lid member with the opening, and the chassis connector is also attached to the entire circumference. Attach the packing material for water, insert the fitting end of the chassis into the lower case through the opening, and insert the screw through the O-ring from the insertion hole on the bottom surface of the lower case to the fitting part of the fitted chassis And the structure which water-stops was employ | adopted by screwing and screwing the inserted screw in the screw hole of the engaging part of the said chassis.

  By adopting such a configuration, when the screw inserted from the bottom surface of the lower case is tightened, the chassis advances to the bottom side of the lower case, and the lid member becomes the lower case as the fitting end of the chassis advances. Mates with the opening. Then, the packing material for water stop is crushed and closed in the gap between the two (the fitting end of the lid member and the opening of the lower case). At the same time, when the fitting end of the chassis advances toward the bottom surface, the connector of the chassis protrudes from the protruding opening of the lower case. Along with this, the water-stopping packing material attached to the connector is crimped between the connector and the protruding port, and is crushed to close the gap. Furthermore, the O-ring inserted through the screw is pressed against the screw by the tightened screw and is crushed to close the gap between the two. In this way, all the sealing and assembling with the packing material and the O-ring can be completed only by tightening the screws on the bottom surface (in one direction).

  In other words, in a waterproof structure using rubber parts, the rubber must be crushed with a certain amount of crushing, but the crushing direction is the same (here, the crushing direction is the same as the pressure contact with the packing material by tightening the screws) Is the same), the amount of crushing of the packing material and the O-ring can be quantitatively managed by adjusting the dimension setting of each component. Therefore, it can be waterproofed relatively easily. By the way, if the crushing direction is different, there is a problem that waterproofing is difficult because there is a gap somewhere or it may not be crushed depending on how it is assembled.

  Further, at this time, the screw insertion holes on the bottom surface of the lower case are formed symmetrically with respect to the central axis of the bottom surface, and the screws of the engagement portions of the chassis are connected to the symmetrically formed insertion holes. A configuration with holes was adopted.

  By adopting such a configuration, if the screws are inserted into the insertion holes formed symmetrically on the bottom surface of the lower case, and the inserted screws are tightened with the same torque and the same tightening amount, for example, Since the pressure applied to the sealing member such as the packing material and the O-ring is not biased between the right and left sides of the case, a high waterproof effect can be expected by crushing the packing material with a constant crushing amount.

  Further, at that time, it is possible to adopt a configuration in which an antenna connected to the circuit member of the chassis and a part for operation are attached to the lid member.

  By adopting such a configuration, when the chassis is attached to the lid member, the electrical main parts are equipped, so the performance can be confirmed in this state. For this reason, defective products can be eliminated and reworked at this stage before being placed in the lower case, which is very efficient without causing waste.

  Since the present invention is configured as described above, the assembling work of the waterproof structure of the portable wireless device can be facilitated.

  Moreover, since it is possible to prevent problems caused by variations in the assembly of sealing materials such as packing materials and O-rings, waterproof performance can be extremely enhanced.

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

  As shown in FIG. 1, the portable radio of this embodiment includes a lower case 11 having an upper opening 10, a case main body 13 including a lid member (upper panel) 12 fitted into the opening 10, and the case The chassis 14 is inserted into the main body 13 through the opening 10.

  The lower case 11 is made of resin in which four corners of a rectangular parallelepiped are rounded, and the inside is hollow. Further, as described above, the upper part is the opening 10, and a fitting groove is formed around the opening 10.

  Further, the lower case 11 has a shape in which a bottom surface 15 is formed at the bottom, and a sleeve 16 for holding the battery is protruded around the bottom surface 15.

  The bottom case 15 of the lower case 11 is provided with a connector projection 17 at the center. In this embodiment, the protrusion 17 has an oval shape that matches the outer shape of the connector 28. For example, the oval shape is formed slightly larger than the connector 28 so that the connector 28 can be easily inserted. (The water is later stopped by the packing material 34).

  Further, insertion holes 18 for screws 35 are provided on both sides of the projecting port 17. The insertion holes 18 are provided symmetrically about the central projection port 17 of the bottom surface 15 as a central axis, and each of the insertion holes 18 provided symmetrically forms a step as shown in FIG. A device has been devised so as not to escape when an O-ring 19 described later is tightened.

  The top panel 12 is made of resin and has an antenna connector 32 and a volume 22 attached thereto.

  That is, as shown in FIG. 2, an attachment hole 21 for attaching the antenna connector 32 is provided on one of the upper parts, and an attachment hole 23 for attaching the volume 22 with switch is provided on the other side. A mounting hole 24 for mounting a display LCD panel is provided between the mounting holes 21 and 23. Further, the fitting portion of the top panel 12 with the opening 10 of the lower case 11 is formed by rounding the four corners of the rectangle so as to be fitted with the opening 10 of the lower case 11, as shown in FIG. A fitting groove 25 is formed around the end.

  The chassis 14 is made of aluminum having a substantially H-shaped cross-section with standing guide panels on both sides of a horizontal panel, and is formed to a size that can be fitted into the hollow of the lower case 11. .

  Further, an engagement panel 27 is erected at a fitting end (lower end in FIG. 1) 26 of the chassis 14 to the lower case 11, and a connector 28 is attached to the panel 27. In this embodiment, the connector 28 is provided with a terminal for power supply, and can be connected to a substrate 30 of the chassis 14 to be described later through the panel 27.

  Further, screw holes 29 are formed on both sides of the connector 28 of the engagement panel 27. The screw hole 29 communicates with the insertion hole 18 on the bottom surface of the lower case 11 described above, and is provided symmetrically about the connector 28 as a central axis.

  On the other hand, holes or the like are provided on both sides of the upper end of the chassis 14 so that, for example, an L-shaped jig or the like for locking the antenna connector 32 and the volume 22 can be attached.

  In addition, the horizontal panel portion of the chassis 14 is an attachment portion for attaching the circuit board 30 and individual components (both front and back surfaces), and for example, a tapped hole is provided to hold these circuit members. ing.

  This configuration is configured as described above. In this wireless device, for example, first, the circuit board 30 and individual components are attached to the chassis 14. Next, the connector 28 is attached to the engagement panel 27 at the insertion end 26 of the chassis 14 and connected to the circuit board 30.

  Further, the antenna connector 32 and the volume 22 are attached to the substrate 30, and the O-ring 31 is fitted and the upper panel 12 is covered as shown in FIG. Since the nut 20 is fastened and fixed in this manner, the O-ring 31 is crushed by the top panel 12 to close the gap and stop the water.

  At the same time, the LCD panel is attached to the attachment hole 24 and is also connected to the substrate 30. Incidentally, the LCD panel is sealed by applying a sealing material to the entire circumference after ultrasonic welding.

  When the chassis 14 can be assembled to the top panel 12 in this way, the circuit is tested. Then, as shown in FIG. 1, the packing material 33 is placed in the groove 25 (formed over the entire periphery of the fitting end) 25 of the top panel 12 as shown in FIG. Fit. Even if the packing material is not completely fitted in the groove 25, this work can be done easily by screwing later. At the same time, the packing material 34 is also attached to the connector 28 of the chassis 14. The packing material 34 has a skirt shape as shown in FIG. 1 and can be fitted over the entire circumference of the connector 28. At this time, since the connector 28 is a small one protruding from the chassis 14, it can be easily fitted.

  Next, the chassis 14 assembled to the top panel 12 fitted with the packing materials 33 and 34 is inserted into the opening 10 from the fitting end 26 and accommodated in the lower case 11. When the top panel 12 covers the opening 10 of the lower case 11, two screws 35 are inserted through the insertion holes 18 in the bottom surface 15 of the lower case 11 through the O-ring 19 as shown in FIG. 35 is screwed into the screw hole 29 of the engagement panel 27 of the chassis 14 and tightened as shown in FIG.

  Then, as shown in FIG. 2, the groove 25 at the fitting end of the top panel 12 and the opening 10 of the lower case 11 are fitted, and the packing material 33 fitted in both the grooves 25 is crushed to close the gap. At the same time, the packing material 34 attached to the connector 28 as shown in FIG. 3B is pressed into the gap between the connector 28 and the projecting opening 17 and is crushed to close the gap. Furthermore, the O-ring 19 inserted into the screw 35 is pressed against the insertion hole 18 by the tightened screw 35 and is crushed to close the gap between them. As a result, the assembly of the waterproof structure is completed as shown in FIG. Since it is only necessary to tighten the screw 35 in this way, anyone can easily assemble.

  At this time, for example, if the two screws 35 are tightened with the same torque and the same tightening amount (simple if a torque driver or the like is used), the sealing member such as the packing material 33 or the O-ring 19 is used. Since it is possible to prevent the applied pressure from being biased between the left and right sides of the case 11, the packing material 33 and the O-ring 19 can be adjusted to a constant crushing amount. Therefore, a high waterproof effect can be expected.

  Moreover, in such a waterproof structure using rubber parts such as the packing material 33 and the O-ring 19, if the crushing direction is different, there is a case where there is a gap somewhere or it is not crushed depending on how it is assembled. By tightening the screws, all can be crushed in the same direction (up and down), so the amount of crushing of the packing material and O-ring can be managed quantitatively by adjusting the dimensional setting of each part. It can be easily and inexpensively waterproofed. Therefore, it is optimal as a waterproof structure of JIS protection class 7 immersion type.

  In this embodiment, the head of the screw 35 that fixes the chassis 14 is elongated in a rod shape. This is because the rod-shaped portion bites into the battery 40 as shown in FIG. Even if the normal screw 35 is used, the waterproof effect is not affected.

Exploded perspective view of the embodiment Sectional drawing of the principal part of embodiment (A), (b) Action explanatory drawing of embodiment Cross-sectional view of the embodiment (A) Perspective view of a conventional example, (b) Cross-sectional view of the main part of a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Opening 11 Lower case 12 Upper surface panel 14 Chassis 15 Bottom surface 17 Projection opening 18 Insertion hole 19 O-ring 26 Insertion end 27 Engagement panel 28 Connector 29 Screw hole 30 Circuit board 33 Packing material 34 Packing material 35 Screw

Claims (3)

A lower case having an upper part and a case main body made of a lid member fitted into the opening, and a chassis fitted into the case main body through the opening,
The lower case is provided with a connector projection and a screw insertion hole on the bottom,
On the other hand, the chassis is provided with a mounting portion for holding a circuit member, and a screw hole communicating with a connector inserted into a protruding opening of the lower case and a screw insertion hole of the lower case at an insertion end into the opening. The other end is provided with an engaging portion that is joined to the lid member,
A circuit member and a connector are attached to the chassis and joined to the lid member, and a waterproofing packing material is attached to the fitting end of the lid member with the opening of the lid member. Attaching the packing material, the fitting end of the chassis is fitted into the lower case through the opening, and a screw is inserted through the insertion hole on the bottom surface of the lower case into the engaging portion of the fitted chassis through the O-ring. A waterproof structure for a portable radio device that stops water by screwing the screw into the screw hole of the engaging portion of the chassis and tightening the screw.   The screw insertion hole on the bottom surface of the lower case is formed symmetrically with respect to the central axis of the bottom surface, and the screw hole of the engagement portion of the chassis is provided so as to communicate with the insertion hole formed symmetrically Item 2. A waterproof structure for a portable wireless device according to Item 1.   The waterproof structure for a portable wireless device according to claim 1 or 2, wherein an antenna connected to the circuit member of the chassis and an operation part are attached to the lid member.

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