JPH0319262Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a casing structure for an electronic device, which is composed of a circuit board assembly including a panel and a circuit board, and a case, which can be detachably attached to each other.

<Prior Art> Electronic devices such as electronic meters often have a structure in which a circuit board on which components are mounted is removably attached to a panel. In this case, conventionally the circuit board has generally been fixed with screws, but this has the disadvantage that attachment and removal operations are troublesome. In addition, since the screws are actually limited to the tip of the circuit board, there is also the drawback that vibrations, tilting, etc. of the circuit board cannot be sufficiently prevented.

<Purpose of the invention> The purpose of the invention is to provide a housing for electronic devices that allows the circuit board to be installed and removed as well as to be inserted into the case itself, and that can reliably prevent the circuit board from vibrating or tilting. It's about providing structure.

<Configuration of the invention> The housing structure of the electronic device of the invention includes a front frame 101 having openings for electronic components at appropriate positions, and the front frame 1.
01 A pair of mounting plates 102 and 103 that are attached to the left and right edges of the inner side facing each other and have a groove 104 reaching the tip on the inner surface thereof and a hole 105 at a predetermined position of the groove 104, and the front frame. Lock claw 109 formed on the bottom plate 107 of 101
an integrally molded panel 100 with a lock piece 108 having a lock piece 108; a circuit board 203 that stands upright on the front side and has electronic components such as a setting device 206 and a display 208 installed on the front side; and the circuit board 203. The pair of mounting plates 102, 103 are mounted horizontally on the inside so as to be orthogonal to each other, and the mounting plates 102, 103 are mounted on at least one of the side edges.
a claw 210 that engages with the hole 105; and a mounting plate 102 located behind the claw 210 at a predetermined distance.
A circuit board assembly 200 is provided with circuit boards 201 and 202 having a stepped part 209 that engages with the tip end of the front frame 103, and a lock piece 108 of the front frame bottom plate 107, which is open at the front and is attached to the lower wall of the front end. Lock claw 10
9 and a guide step portion 303 that has a notch 301 and a hole 302 corresponding to the shape of the circuit board 20 and guides the side edges of the mounting plates 102 and 103 on the inner surface of the side wall.
It consists of an integrally molded case 300 having a guide protrusion 304 for guiding the side edge of the case 1,202.

When assembling the circuit board assembly 200, the circuit board assembly 200 is first placed between the pair of mounting plates 102 and 103 of the panel 100 from behind.
Insert the circuit board 2 with 03 on the front side.
03 is immediately brought into contact with the front frame 101 of the panel 100, and the setting device 206 and the display device 208 are inserted into the opening thereof.
In addition, the claws 210 of the circuit boards 201 and 202 of the circuit board assembly 200 are connected to the holes 10 of the mounting plates 102 and 103 of the panel 100.
5 and the stepped portions 209 of the circuit boards 201 and 202 are engaged with the tips of the mounting plates 102 and 103, so that the circuit board assembly 200 is attached to the panel 100.
Next, to attach the circuit board assembly 200 to the case 300, push it through the opening of the case 300.
A protrusion 304 guides the side edges of the circuit boards 201 and 202.
The installation plates 102 and 103 are guided by
The side edge of the front frame bottom plate 107 is guided by the guide step 303, and the lock piece 108 of the front frame bottom plate 107 is cut out 301.
At the same time, insert the locking claw 109 into the hole 302.
All you have to do is engage it.

Also, when removing it, please use the lock piece 1.
08, the lock claw 109 is unlocked, the unit of the circuit board assembly 200 is pulled out from the case 300, and then the panel 100 is removed.
To remove the circuit board assembly 200 from the
The circuit board assembly 200 can be pulled out rearward by releasing the lock provided by the hole 105.

<Embodiment of the invention> Hereinafter, an embodiment of the invention will be described in more detail with reference to the drawings.

FIG. 1 is a schematic exploded perspective view of the housing structure of an electronic device embodying the present invention. In this figure, 1
00 is a panel, 200 is a circuit board assembly, 300
is the case. The circuit board assembly 200 is attached to the panel 100 and inserted into the case 300.

FIG. 2 shows a circuit board assembly 200 attached to a panel 100.
FIG. 3 is a schematic side view schematically showing a state in which it is attached to a case 300 and inserted into a case 300, and FIG. 3 is a schematic bottom view thereof.

First, to explain the panel 100, this panel 100 is integrally molded from plastic, and a front frame 101 has a pair of mounting plates 1.
02 and 103 are extended. Each mounting plate 10
Grooves 104 are formed on the inner surfaces of the mounting plates 102 and 103, and the rear ends of each groove are open at the tips of the mounting plates 102 and 103, but the front ends are closed. A hole 105 is formed in each groove 104 at a position a certain distance from the tips of the mounting plates 102 and 103. Further, as shown in FIG. 3, a locking piece 108 is provided on the fixed plate 107 extending from the lower end of the front frame 101, and a claw 10 is provided approximately at the center of the locking piece 108.
9 is provided to protrude downward.

The circuit board assembly 200 will be explained. 20
1, 202, 203 are circuit boards. The circuit boards 201 and 203 are connected to the circuit board 20 through a connector 204 and a conductive wire 205 at their front ends.
3, it is electrically connected and fixed almost perpendicularly to the circuit board 203 as shown. The same applies to the circuit board 202 and the circuit board 203. On the front side of the circuit board 203, a digital setting device 206, a light emitting diode 207, and other parts such as a variable resistor (not shown in the figure) are soldered, and a display 208 is soldered to the front side of the circuit board 203.
is connected to the circuit board 2 via an insulated conductor wire.
Components such as resistors and transistors are mounted on the inner surfaces of 01 and 202 (not shown).

The front portions of the circuit boards 201 and 202 are slightly narrower than the rear portions, with step portions 209 formed approximately at the center of both side edges as a boundary. However, the width of the front portions of the circuit boards 201 and 202 is slightly wider than the width of the circuit board 203, so that both side edges of the circuit boards 201 and 202 protrude slightly to the outside of the circuit board 203. In addition, the circuit board 20
1, 202, claws 210 are provided protruding forward from the step portion 209 by a certain distance.

Note that the front frame 101 of the panel 100 is formed with openings corresponding to a digital setting device 206, a light emitting diode 207, a variable resistor, and a display 208, and a nameplate 111 and a transparent plate are formed in front of these openings. 112 etc. are installed.

The case 300 is integrally formed of plastic, and the lower wall of the front end has a notch 301 and a hole 302 corresponding to the lock piece 108 and its pawl 109.
is formed. On the inner surface of the side wall of the case 300, there are guide steps 303 for guiding the side edges of the mounting plates 102 and 103, and circuit boards 201 and 202.
A guide protrusion 304 is formed to guide the side edge of. Further, a plurality of terminals are attached to the rear wall of the case 300 to be coupled to contact portions at the rear ends of the circuit boards 201 and 202. (Illustration omitted).

Next, attachment of the circuit board assembly 200 to the panel 100 will be explained with reference to FIG. 4.

Place the circuit board 20 with the circuit board 203 on the front side.
Each side edge of the front end of 1,202 is attached to a mounting plate 102,
103 into the groove 104 of the circuit board assembly 2.
Advance 00. Initially, it is in the state shown in FIG. 4a, but as it is further advanced, the circuit board 201,
The inclined portion 210a of the pawl 210 of 202 and the groove end of the groove 104 engage, and the mounting plates 102, 103 are gradually pushed outward, and as they are further advanced, the pawl 2
The top 210b of 10 engages the groove 104, resulting in the condition shown in FIG. 4b. The entire claw 210 is the hole 105
When the circuit board assembly 200 is advanced to a position that is aligned with the edge of the hole 105 and the top 210 of the pawl 210,
b is disengaged, the mounting plates 102 and 103 return to their original positions due to restoring force, and as shown in FIG. 209 is engaged with the tips of the mounting plates 102 and 103, and portions of the circuit boards 201 and 202 on both sides in front of the stepped portions 209 are engaged with the grooves 104. In this way, the circuit board assembly 200 can be moved forward, backward, left, right, up and down, and the entire circuit board assembly 200 can be moved forward, backward, left, right, up and down.
It is supported and fixed at 00.

In this way, the circuit boards 201, 202, 203
can be attached to the panel 100 with an extremely simple operation. Further, by making the mounting plates 102, 103 sufficiently long and widening the support range of the circuit boards 201, 202, vibrations, tilting, etc. of the circuit boards 201, 202 can be more reliably prevented. Moreover,
Unlike the case of screw fastening, the circuit boards 201 and 202
Since the side edges of the circuit boards 201 and 202 are used for fixation, even if the support range is expanded, the effective usable area of the circuit boards 201 and 202 for forming circuit patterns, etc. will not be reduced. In addition, conventionally, when screwing etc. is done at the front end,
In order to prevent vibration and tilting of the circuit boards 201 and 202, it was necessary to provide a connecting fitting between the circuit boards as shown by the chain line 215 in FIG. According to the invention, since the panel 100 is firmly fixed by the mounting plates 102 and 103, it is unnecessary to use such connecting fittings, and accordingly, the work process for fixing it with soldering screws, etc. This eliminates the need to solder (which required a long time due to the large amount of soldering), and at the same time eliminates the need for mounting space on the circuit board.

Circuit board assembly 20 installed as described above
0 from the panel 100, remove the mounting plate 1
02, 103 outward, and insert the claw 210 into the hole 1.
05, the circuit board assembly 20
Just pull 0 backwards. In this way, removal is also extremely easy.

When inserting the panel 100 and the circuit board assembly 200 attached thereto into the case 300, the unit is inserted into the case 300 from the rear end of the circuit board assembly 200. Then, the rear edge of the circuit boards 201, 202 and the mounting plate 10
The side edges of 2,103 are the guide protrusion 304 and the stepped portion 303
engage with. When the unit is further inserted while being guided by the guide protrusion 304 and the stepped portion 303, the contact portions at the rear ends of the circuit boards 201 and 202 begin to come into contact with the contacts of the terminals provided on the rear wall of the case 300. If you push the unit further,
Since the inclined portion 109a of the claw 109 engages with the lower wall of the case 300, the lock piece 108 is gradually pushed upward and bent as the unit is inserted. When the unit is further pushed in and the rear surface of the front frame 101 is engaged with the front surface of the case 300, the claws 109
enters the hole 302, and the nail 1 is attached to the edge of the hole 302.
09 is locked, and the unit is fixed to the case 300.

When removing the unit from case 300,
Push in the tip 110 of the lock piece 108 protruding from the notch 301 of the case 300 with your fingers,
The lock pawl 108 is pushed inward and bent to allow the pawl 109 to escape from the hole 302. In this state, pull out the unit from the case 300.

Although one embodiment has been described in detail above, it goes without saying that the present invention is not limited to the configuration of the same embodiment.

For example, although the above embodiment is an example in which circuit boards 201, 202, and 203 are mounted in advance in communication with each other, it is clear that one or more separate circuit boards may be mounted in the same manner.

Further, in the above embodiment, the steps 209 and the claws 210 for mounting are provided on both sides of the circuit boards 201 and 202, but the steps 209 and the claws 210 are provided only on one side edge.
It is also possible to provide 0. In that case, hole 10
5 also has a groove 1 corresponding to the side edge of the circuit board where the claw 210 is located.
It is sufficient to provide only 04.

In the above embodiment, the mounting plate 102,
Three grooves 1 attached to each of 103
The middle one in 04 is not used. The groove is provided in case a circuit board similar to the circuit boards 201 and 202 is added.

<Effects of the invention> As explained in detail above, according to the housing structure of an electronic device according to the present invention, it is possible to freely attach and remove a circuit board from a panel, and at the same time, it is possible to freely attach and detach a circuit board to a panel. An excellent casing structure is obtained in which the board assembly can be freely inserted into and removed from the case of the unit, and which can reliably prevent vibrations, tilting, etc. of the mounted circuit board.

[Brief explanation of the drawing]

Fig. 1 is a schematic exploded perspective view of the casing structure of an electronic device that is an embodiment of the present invention, Fig. 2 is a schematic side view with a part of the casing structure of the electronic device cut away, and Fig. 3 is a schematic exploded perspective view of the casing structure of the electronic device. FIG. 4 is a schematic bottom view with a part of the housing structure cut away, and FIG. 4 is an explanatory diagram of mounting the circuit board. 100...Panel, 101...Front frame, 102,
103...Mounting plate, 104...Groove, 105...
Hole, 107...Bottom plate, 108...Lock piece, 10
9...Lock claw, 200...Circuit board assembly, 2
01, 202, 203...Circuit board, 206...
Setting device, 208...Display device, 209...Step part, 2
10...nail, 300...case, 301...notch, 302...hole.

Claims (1)

[Scope of utility model registration request] Front frame 10 having openings for electronic components at appropriate positions
1, a pair of mounting plates 102 which are attached to the left and right edges inside the front frame 101 so as to face each other, and have a groove 104 reaching the tip on the inner surface thereof, and a hole 105 at a predetermined position of the groove 104; 10
3 and a locking piece 108 having a locking claw 109 formed on the bottom plate 107 of the front frame 101;
A circuit board 203 on which electronic components such as a setting device 206 and a display 208 are installed on the front side, and a pair of mounting plates 102 and 1 on the inside of the circuit board 203.
It is installed horizontally so as to be orthogonal to 03,
Further, at least one of the side edges thereof has a claw 210 that engages with the hole 105 of the mounting plates 102, 103, and a step portion that engages with the tip of the mounting plates 102, 103 at the rear of the claw 210 at a predetermined distance. 2
A circuit board assembly 200 is provided with circuit boards 201 and 202 having 09, and the front is opened, and a lock piece 108 of the front frame bottom plate 107 is provided at the front end and the lower wall.
Notch 301 and hole 3 corresponding to lock pawl 109
02 and the mounting plate 10 on the inner surface of the side wall.
A housing structure for an electronic device characterized by comprising an integrally molded case 300 having a guide step portion 303 for guiding the side edges of the circuit boards 2 and 103 and a guide protrusion 304 for guiding the side edges of the circuit boards 201 and 202. .