JPS6314479Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has an inner frame inside the case, and a circuit board that handles high frequency signals such as television signals or other electrical signals is fixed to the inner frame.
Furthermore, the present invention relates to an electronic device having a structure in which the inner frame and the circuit board are grounded to the case via a grounding piece.

The purpose is to provide an electronic device in which the inner frame, circuit board, and grounding piece can be disassembled and assembled with good workability.

The drawings showing the embodiments of the present application will be described below.

Reference numeral 1 denotes a housing, which consists of a case 2 formed in a concave shape from a material with good conductivity such as an aluminum alloy, and a lid 9 detachably attached to the case 2. In the case 2, 3 is a screw hole drilled in a part of the peripheral wall, 4 is a fastening part formed in a part of the bottom wall, 5 is a screw hole, and 6 is an opening of the case 2 in the end face of the peripheral wall. A recess 7 formed to surround the recess 7 is a gasket placed in the recess 6, and is made of an elastic material such as rubber as is well known. 8 is the fastening part,
As is well known, a female screw hole is formed. Next, the lid 9 is made of the same material as the case 2. This lid 9 has a well-known fastening bolt attached to the fastening part 8.
It is fixed to the case 2 by screwing into the screw hole. Furthermore, the seal 7 maintains waterproofness between the lid 9 and the case 2.

Next, reference numeral 10 is a plug seat screwed into the screw hole 3, and there are various types such as a fitting type, an F type, and a BNC type. A nut 10a is screwed onto the plug seat 10 to ensure the fixation of the plug seat 10, and is made of a conductive material. In this plug seat 10, 11 indicates an outer conductor, 12 an insulator, and 13 a center conductor.

Next, 14 is an electronic device main body, which has an inner frame 15 and an electronic circuit 30. The middle frame 15 is composed of a middle frame body 16 and a middle frame lid 15', each of which is made of a conductive material such as aluminum or iron. In the middle frame main body 16, 17 is a notch part, and 18 is a fastening part, which are formed by cutting and raising a part of the middle frame main body, and have a screw hole 18a.
Reference numeral 19 denotes an insertion window, which is formed when the fastening portion 18 is formed. Reference numeral 20 denotes a fixing piece, which has a notch part continuous to the notch part 17. 21 is a through hole. 2
2 indicates a threaded rod. A partition plate 23 is made of a conductive material to prevent mutual interference between electronic circuits, which will be described later. Next, a grounding piece 24 is made of a conductive material having elasticity, such as a phosphor bronze plate such as PBSP-SH. In this grounding piece 24, 25 is a missing part, 26 is a mounting piece provided at the base, 27 is a through hole, and 28 is a connecting part provided at the tip, which is in elastic contact with the nut 10a as a grounding part. . Note that the grounding portion may be the inner surface of the case 2. 29 indicates a contact portion provided at the tip. Next, 30 and 30 indicate electronic circuits, respectively. These electronic circuits 30 include amplifier circuits, branch circuits, distribution circuits, pilot signal generation circuits, frequency conversion circuits, and high frequency (TV) circuits.
There are various circuits that handle signals. The above electronic circuit 30
31 is a circuit board (generally called a printed circuit board) in which a circuit conductor made of copper foil is attached to one surface of an insulating plate 31a. As is well known, the circuit conductors include a ground circuit conductor 33, a signal circuit conductor 35, and the like. Reference numeral 34 indicates a through hole drilled in the substrate, and reference numeral 32 indicates a missing portion. 3
6 is a well-known center conductor connector, and the signal circuit conductor 35
are connected by soldering. 39 indicates a well-known circuit element. 40 indicates a threaded rod for fastening. 4
Reference numeral 3 denotes a spacer, which is used in place of the threaded rod 40 in the vicinity of the connection seat 10 at the four corners to have the same function as the screw rod 40, and also has a fastening part for fastening the inner frame lid 15'. It consists of Furthermore, it is made of a highly conductive material such as steel or copper so that the potential of the lid 15' is equal to the potential of the ground circuit conductor on the circuit board.
Reference numeral 45 indicates a threaded rod for fixing the middle frame lid 15'.

Inspection of the electronic circuit 30 with the above configuration,
When making adjustments, first open the lid 9 and then take out the electronic device main body 14 from the case 2. The operation will be explained in detail below. First, remove the bolt from the fastening part 8 and open the lid 9 to the case 2. Next, loosen and remove the threaded rod 22. If the electronic device main body 14 is pulled out toward the opening of the case 2 in this state, the electronic device main body 14 can be easily taken out from the case 2. And the electronic device main body 14 taken out
Visual inspection of it, or even inner frame lid 1
5' is removed to perform the well-known inspection, adjustment, etc. of the electronic circuit on the circuit board 31.

Next, when mounting the electronic device main body 14 that has been taken out into the case 2, first the electronic device main body 14 is inserted from the position shown by the imaginary line in FIG. Put it in the state shown in . At this time, the connecting portion 28 of the grounding piece 24 contacts the nut 10a and bends as shown, and the connecting portion 28 contacts the nut 10a, and the contact portion 29 contacts the inner frame lid 15'. Therefore, the circuit board 3
The first ground circuit conductor 33 is grounded to the case 2 via the ground piece 24 and the nut 10a, and at the same time, the middle frame 15 is also grounded to the case 2. Moreover, the center conductor 13 is connected to the connector 36 through the cutouts 17, 25, and 32. In this state, fixing piece 2
When the screw rod 22 is tightened into the screw hole 5 of the fastening part 4 through the through hole 21 of 0, the electronic device main body 14 is fixed to the case 2. Note that the connection portion 28 is in contact with the nut 10a and the contact portion 2 is in contact with the lid 15'.
Since the contacts 9 are made over a long range of the entire length of the ground piece 24 in the width direction, the electrical connection between them is good.

Next, the assembly of the electronic device main body will be explained.

First, the attachment piece 26 of the ground piece 24 is passed through the insertion window 19 and overlapped with the fastening piece 18. Then, place the circuit board 31 on top of the mounting piece 26. In this state, insert the threaded rod 40 or spacer 43 into the through hole 3.
4 and 27 and screwed into the screw hole 18a. Through the above operations, the three mechanical attachments of the circuit board 31 to the inner frame main body 16, the mechanical attachment of the ground piece 24 to the board 31, and the electrical connection of the ground piece 24 to the ground circuit conductor 33 of the circuit board 31 are completed. action is achieved. Next, the middle frame lid 15' is placed on the middle frame main body 16, and the lid 1
By screwing the threaded rod 45 into the screw hole of the spacer 43 through the screw 5', the lid 15' is attached to the main body 16.
sticks to.

The above operations complete the assembly of the electronic device main body.

Next, FIG. 8 showing a different embodiment of the present application will be described. This figure shows an example in which a circuit board having circuit conductors on both the front and back surfaces of an insulating plate is used. In the figure, 33e is a ground circuit conductor provided on both the front and back surfaces, and in this example, the ground piece 24e is connected to the ground circuit conductor 33e on the front side.
The mounting pieces 26e of the two are overlapped to establish an electrical connection between them.

It should be noted that the same reference numerals as those in the previous figure are appended with an alphanumeric letter "e" for parts that are functionally the same or equivalent to those in the previous figure, and redundant explanations are omitted.
(Also, in the following figure, the same idea is given by adding an alphanumeric letter f and redundant explanation is omitted.) Next, Figure 9 shows a different example of the grounding piece, and this is used instead of the above-mentioned grounding piece. A grounding piece 24f having such a shape may also be used.

As described above, in this invention, the middle frame 15 is made to be able to move in and out of the case 2, so when inspecting the circuit board 31, the middle frame 15 and the middle frame 15 are moved into the case 2.
It has the advantage of being easy to take out and inspect externally. Furthermore, when inserting the inner frame 15 into the case 2, since the ground piece 24 has elasticity, just by inserting the inner frame 15 into the case 2, the ground piece 24 comes into elastic contact with the grounding part. There is also the operational advantage that the circuit board 31 can be grounded to the case 2.

Moreover, when grounding like that, ground piece 2
Since the base part of 4 is overlapped with a part of the circuit board 31, the circuit board 31 can be connected to the grounding part of the case 2 over a short distance, which has the effect of improving the electrical characteristics.

Furthermore, a threaded rod 40 is inserted into the through holes 34 and 27 provided at the overlapping portion of the substrate 31 and the ground piece 24, respectively.
is inserted and screwed onto the fastening part 18. Therefore, when assembling or disassembling the inner frame 15, circuit board 31, and grounding piece 24, (1) the mechanical contact of the circuit board 31 with respect to the inner frame 15 is (2) Mechanical attachment or removal of the ground piece 24 to the board 31; (3) Electrical connection or disconnection of the ground piece 24 to the board 31. It has the operational effect of being able to obtain the effect of ``grounding over a short distance.''

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway assembly view, FIG. 2 is a sectional view taken along the - line, FIG. 3 is a sectional view taken along the - line, FIG. The figures are - line sectional views, Fig. 6 is an exploded perspective view, Fig. 7 is - line sectional views, Fig. 8 is a similar view to Fig. 3 showing a different embodiment, and Fig. 9 is a different example of the grounding piece. Diagram showing. 2...Case, 15...Inner frame, 31...Circuit board, 24...Grounding piece.

Claims (1)

[Scope of utility model registration request] A middle frame is disposed within the concave case so as to be able to move in and out, and a circuit board is fixed to the middle frame, and a base part of an elastic ground piece is fixed to a part of the circuit board, and In an electronic device, the tip of the grounding piece is brought into elastic contact with the grounding part of the case so that the circuit board is grounded to the case via the grounding piece. The structure of fixing the base of the grounding piece to the circuit board is such that the fixing part is provided on a part of the inner frame, and the base of the grounding piece is overlapped with a part of the circuit board. An electronic device characterized in that through-holes are formed in each of the fixing parts, and a threaded rod for fixing is passed through the through-holes and screwed onto the fixing part.