JP5018765B2 - Filling structure of the explosion-proof radio equipment filler. - Google Patents

Description

  The present invention relates to an explosion-proof radio, and more particularly, to a filling structure for a filler of a handheld radio.

  In conventional explosion-proof radios, a technique of covering the printed circuit board with a resin filler is used to prevent the flammable gas from touching the printed circuit board. The conventional method will be described with reference to FIGS.

  First, as shown in FIG. 8, the printed circuit board 15 and the electronic components 16, 16... Mounted on the printed circuit board 15 are covered with an enclosure jig 17. Next, as shown in FIG. 9, the resin 13 is injected into the enclosure jig 17 by the filling nozzle 14 from the filler injection port 17 a of the enclosure jig 17.

  At this time, the air in the enclosure jig 17 is discharged from the air discharge port 17 b of the enclosure jig 17. When the resin 13 is injected into the enclosure jig 17 in this way, the air discharge port 17b is also filled with the resin 13.

  Then, after the resin 13 is solidified, the enclosure jig 17 is separated from the printed board 15 as shown in FIG. Then, the resin 13a solidified in the air discharge port 17b is separated from the other portions of the resin 13.

  When the conventional printed circuit board shown in FIGS. 8 to 9 is covered with a resin filler, a part of the resin 13 may be peeled off when the enclosure jig 17 is separated from the solidified resin 13. Therefore, the mold release work has been difficult.

  In order to facilitate the mold release operation, the resin agent is limited, and it is necessary to apply the mold release agent to the enclosure jig 17. However, the enclosure jig 17 is necessary, and further the mold release operation is performed. Since a mold application step is required, this has been a factor in increasing manufacturing costs.

  Further, in order to incorporate the printed circuit board 15 covered with the resin 13 after the enclosure jig 17 is removed into the explosion-proof radio, there is a problem that a space is generated around the resin 13 and the space efficiency is deteriorated.

  In the electrical junction box disclosed in Japanese Patent Application Laid-Open No. 2006-14576, the potting agent injected into the space between the concave portion 50 formed on the bottom surface of the housing 20 and the back surface of the circuit board (printed circuit board) 11 occupies the space. After filling, the potting agent overflows from the cylindrical portion 54 communicating with the space to the surface side of the circuit board 11 and covers the periphery of the electronic component mounted on the surface of the circuit board 11.

In the electrical junction box disclosed in the above Japanese Patent Application Laid-Open No. 2006-14576, when the viscosity of the potting agent overflowing to the surface side of the circuit board 11 is high, the surface does not become a horizontal plane, and the surface of the circuit board 11 It was difficult to make the thickness of the potting agent covering the surface constant, and it was difficult to obtain stable quality.
Japanese Unexamined Patent Publication No. 2006-14576, paragraphs 0023 to 0042, FIGS. 1 to 7

  The present invention has been made in view of the above points, and an object of the present invention is to provide a filling structure of a filler for an explosion-proof radio having a low manufacturing cost and stable quality.

  The filler filling structure of the explosion-proof radio of the present invention is such that the bottom surface of the printed circuit board is opposed to the bottom surface of the chassis, a member support plate is disposed above the printed circuit board, and components are mounted on the printed circuit board. In the explosion-proof handy-type radio device, a filler introduction groove is provided in the longitudinal direction of the lower surface of the member support plate facing the printed circuit board, and a filler injection port is provided at one end of the filler introduction groove. An air discharge port that opens in a slit shape is provided in the downstream peripheral portion of the part of the filler of the member support plate, and a space between the member support plate and the printed board from the filler injection port The filler is injected into the space, and the air in the space between the member support plate and the printed board is pushed out from the slit-like air discharge port, and the space is filled with the filler.

  Further, the filling structure of the filler of the explosion-proof radio according to the present invention is such that the lower surface of the printed circuit board is opposed to the bottom surface of the chassis, a member support plate is disposed above the printed circuit board, and a connector is disposed on the upper surface of the printed circuit board. In the explosion-proof handheld radio device in which the peripheral frame of the connector is pressed by the member support plate via the connector packing, the longitudinal direction of the lower surface of the member support plate facing the printed circuit board is mounted. A filler inlet groove is provided, a filler inlet is provided at one end of the filler inlet groove, and an air outlet opening in the form of a slit in the peripheral portion of the member support plate on the downstream side of the connector of the filler. The filler is injected into the space between the member support plate and the printed board from the filler injection port, and the member support plate and the printed board Extruding the air space between the said slit-like air outlet is obtained by filling a filler in the space.

  Further, in the filler filling structure of each explosion-proof radio, a weir for restricting the flow of the filler is provided on the upstream side of the filler in the slit-like air discharge port close to the filler inlet. is there.

  Further, in the filler filling structure of each explosion-proof wireless device, a filler injection port is provided on one end side of the printed circuit board, and an air discharge port is provided on the other end side of the printed circuit board. The filler filling structure for an explosion-proof radio set forth in any one of claims 1 to 3, wherein a filler is filled also in a space from the filler inlet to the printed circuit board and the chassis bottom surface.

  Further, in the filler filling structure of each of the explosion-proof radios, a speaker mounting member is formed on the member support plate, and a release hole is provided on a bottom surface of the speaker mounting member facing the speaker. .

  According to the filler filling structure of the explosion-proof wireless device of the present invention, the filler can be easily filled without excess or deficiency without causing a gap in the space between the component mounting surface of the printed circuit board and the member support plate. Manufacturing cost is low and quality is stable.

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

  First, a filling structure of a filler of an explosion-proof radio that is Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing a filling structure of a filler of an explosion-proof radio that is Embodiment 1 of the present invention.

  The chassis 1 shown in FIG. 1 is formed in a box shape, and is fastened to the chassis 1 so that the lower surface of the printed circuit board 2 faces the bottom surface of the chassis 1. This state is shown in FIG. As shown in FIG. 2, four connectors 6, 6... (Shown in FIG. 2) are mounted on the printed circuit board 2, and a connector packing 6 a is attached to the frame of each connector 6.

  One end of the printed circuit board 2 is provided with a filler inlet 2a, and the other end is provided with an air outlet 2b. The resin 13 which is a synthetic resin filler is filled from the filler inlet 2a. The filler fills the space by pushing air in the space between the lower surface of the printed circuit board 2 and the bottom surface of the chassis 1 from the air outlet 2b.

  The member support plate 3, which is also shown in detail in FIGS. 3 and 4, is fastened to the chassis 1 in a state where the filler is filled in the entire space on the lower surface of the printed circuit board 2 so that the filler overflows from the air outlet 2 b. The In FIG. 3, the member support plate 3 is shown upside down so that the lower surface facing the chassis 1 faces upward. A speaker mounting base 4 and a microphone mounting base 4 a are integrally formed on the member support plate 3. FIG. 1 shows a microphone substrate 5 fitted to a speaker mounting base 4 and a microphone mounting base 4a (shown in FIG. 4).

  As shown in FIG. 3, the member support plate 3 is provided with four FPC (flexible printed cable) insertion holes 3d, 3d... At positions corresponding to the four connectors 6, 6,. Ribs 3f and 3f are formed around the hole 3d.

  A filler introduction groove 3c is formed on the back surface side of the member support plate 3, and a filler injection port 3a is provided at one end of the filler introduction groove 3c. Then, as shown in FIG. 4, a liquid resin 13 (shown in FIG. 1) that is a synthetic resin filler is filled from the filler inlet 3 a through the filling nozzle 14.

  The filler is guided to the filler introduction groove 3 c and fills the space between the back surface of the member support plate 3 and the printed board 2. Notches 3g, 3g... Are formed in the periphery of the member support plate on the downstream side of the filler, and a slit-like air discharge port 3b (see FIG. 4) is formed between the notches 3g, 3g. Are formed).

  After the air is pushed out from the air discharge port 3b, the resin overflows, but in order to allow the resin to overflow from the air discharge ports 3b, 3b. Weirs 3e and 3e for restricting the flow of the filler are provided at the edges of 3g and 3g.

  The connector packings 6a, 6a ... of the connectors 6, 6 ... are held by the bottom surface of the member support plate 3 or the ribs 3f, 3f of the member support plate 3, and the filler flows in the frame of the connectors 6, 6 .... Partitioned from space.

  The connectors 6, 6... Form a space area where no filler flows, but since the slit-like air discharge port is formed on the downstream side of the connectors 6, 6,. The filler is filled without leaving any voids around. Furthermore, since the recess 3h is provided around the portion of the member support plate that forms the air discharge port, the filler overflowing from the air discharge port accumulates in the recess 3h, and the filling operation is facilitated.

  Then, by appropriately designing the number, shape, and dimensions of the filler introduction groove 3c, the weir 3e, and the notch 3g, the resin is allowed to overflow from each air discharge port at the same time, so that the filler is placed on the upper surface of the printed board 2. The entire space can be filled.

  After the filler is thus filled and solidified, the speaker 8 and the microphone 9 are attached as shown in FIG. Then, a connector 7 a attached to the front end of the FPC 7 connected to an electronic component (not shown) attached to the side wall of the chassis 1 is fitted into the connector 6 of the printed circuit board 2. Since the filler does not flow into the frame of the connector 6, the connector 7a can be inserted and removed.

  FIG. 6 is a schematic sectional view showing a filling structure of a filler of an explosion-proof radio according to Embodiment 2 of the present invention, and FIG. 7 is a partial perspective view showing the filling structure. In this example, the member support plate 10 provided with the speaker mount 11 is used instead of the member support plate 3 of the first embodiment. Similar to the member support plate 3 of the first embodiment, the member support plate 10 has a function of supporting a component such as a speaker and a function of forming a space filled with a filler above the printed circuit board.

  The structure of the member support plate 10 other than the speaker mount 11 is the same as that of the member support plate 3 of the first embodiment. Members other than the member support plate 10 are the same as the members of the first embodiment, and a description of the configuration and operation thereof is omitted.

  In this example, large and small release holes 11 a, 11 a... Are provided on the bottom surface of the speaker mounting base 11, and ventilation holes 11 b, 11 b. Is provided. These release holes 11a and vent holes 11b function as air discharge ports when the filler is injected into the upper surface side of the printed circuit board.

  When injecting the filler into the upper surface side of the printed circuit board, the filler is injected to a position where the release hole 11a and the vent hole 11b are not blocked. In this way, the space behind the speaker attached to the speaker mounting base 11 communicates with the outside, so that the vibration of the speaker diaphragm is not suppressed by the back pressure.

  The embodiment is configured as described above, but the invention is not limited to this. For example, the speaker mounting base or the microphone mounting base may be bonded or fastened to the member supporting plate as a separate member from the member supporting plate. Moreover, you may use substances other than a synthetic resin as a filler.

It is a schematic sectional drawing which shows the filling structure of the filler of the explosion-proof radio | wireless machine which is Example 1 of this invention. It is a fragmentary perspective view which shows the filling structure. It is a perspective view which shows the member of the filling structure. It is a perspective view which shows the part of the filling structure. It is a top view which shows the filling structure. It is a schematic sectional drawing which shows the filling structure of the filler of the explosion-proof radio | wireless machine which is Example 2 of this invention. It is a fragmentary perspective view which shows the filling structure. It is a schematic sectional drawing for demonstrating the manufacturing process of the conventional explosion-proof radio | wireless machine. It is a schematic sectional drawing for demonstrating the other step of the manufacturing process of the same explosion-proof radio | wireless machine. It is a schematic sectional drawing for demonstrating the further another stage of the manufacturing process of the same explosion-proof radio | wireless machine.

Explanation of symbols

1 Chassis 2 Printed circuit board, 2a Filler inlet, 2b Air outlet 3 Member support plate, 3a Filler inlet, 3b Air outlet, 3c Filler introduction groove 3d FPC insertion hole, 3e weir, 3f rib, 3g Notch, 3h Depression 4 Speaker mounting base, 4a Microphone mounting base 5 Microphone board 6 Connector, 6a Connector packing 7 FPC, 7a connector 8 Speaker 9 Microphone 10 Member support plate 11 Speaker mounting base, 11a Release hole, 11b Vent hole 12 Microphone board 13 Resin 14 Filling nozzle 15 Printed circuit board 16 Electronic component 17 Enclosing jig, 17a Filler inlet, 17b Air outlet

Claims (5)

In the explosion-proof handy radio device in which the lower surface of the printed circuit board is opposed to the bottom surface of the chassis and a member support plate is disposed above the printed circuit board and components are mounted on the printed circuit board, A filler introduction groove is provided in the longitudinal direction of the lower surface facing the printed circuit board, a filler injection port is provided at one end of the filler introduction groove, and the periphery of the component support plate on the downstream side of the part of the filler An air discharge port that opens in a slit shape is provided in the part, and a filler is injected from the filler injection port into a space between the member support plate and the printed circuit board, and the member support plate and the printed circuit board A filler filling structure for an explosion-proof wireless device, wherein the space is filled with a filler by pushing out air in the space from the slit-shaped air discharge port. A printed circuit board lower surface is opposed to the chassis bottom surface with an interval, a member support plate is disposed above the printed circuit board, and a component including a connector is mounted on the printed circuit board upper surface. In the explosion-proof handy-type wireless device in which the peripheral frame is pressed via the connector packing, a filler introduction groove is provided in the longitudinal direction of the lower surface of the member support plate facing the printed circuit board, and one end of the filler introduction groove is provided. A filler inlet is provided, and an air outlet opening in the form of a slit is provided in a peripheral portion downstream of the filler connector of the member support plate, from the filler inlet to the member support plate and the member Filler is injected into the space between the printed circuit board and the air in the space between the member support plate and the printed circuit board is pushed from the slit-shaped air discharge port. Filling structure fillers explosion-proof radio, characterized in that the filler is filled in the space out. The filler filling structure for an explosion-proof radio according to claim 1 or 2, wherein a weir for restricting the flow of the filler is provided on the upstream side of the filler in the slit-like air outlet near the filler inlet. A filler injection port is provided at one end of the printed circuit board, an air discharge port is provided at the other end of the printed circuit board, and a space between the printed circuit board and the chassis bottom surface from the filler injection port of the printed circuit board. The filler filling structure for an explosion-proof radio device according to any one of claims 1 to 3, wherein the filler is also filled with the filler. 5. A filler for an explosion-proof radio device according to claim 1, wherein a speaker mounting member is formed on the member support plate, and a release hole is provided on a bottom surface of the speaker mounting member facing the speaker. Filling structure.

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