JPH10209653A - Method for fitting board to chassis and board-fixing member used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for fixing a board to a chassis which enables easy positioning and fixing of a chassis and a board, and can reduce the number of fixing operation processes. SOLUTION: A board fixing plate-like member 20 for fixing a board 22 to a chassis 21 from the side of a major diameter (g) of an oval reference hole 23 having a major diameter and a minor diameter is inserted to the reference hole 23 and a cut-out portion 20d of the board fixing plate-like member 20 is put and fixed in a chassis by rotating the board fixing plate-like member 20 to the side of a minor axis (f) by 90 deg. manually. Then, the board 22 is firmly fixed to a projection 20c of the board fixing plate-like member 20 by soldering and the board 22 is thereby fixed to the chassis 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board fixing method for fixing a board to a chassis and a board fixing member used for the board fixing method.

[0002]

2. Description of the Related Art BNC is used as a substrate for forming electrical equipment.
A board in which a coaxial connector such as a connector is connected to a connector terminal of the board by soldering may be used.
As shown in the external view of FIG. 5A and the internal sectional view of FIG. 5B, the BNC connector generally has a center contact 1, an insulator 2 supporting a center conductor, a main body 3 having a male screw, It comprises a locking washer 4, a washer 5, a mounting nut 6, an earth lug 7, and a spacer 8 provided at the end of the main body 3.

When the board with the BNC connector is fixed to the chassis, the dimension of the board to which the BNC connector is inserted should be at least 0.2 to 0.3.
It is necessary to position with an accuracy of mm. For this reason, conventionally, in order to improve the accuracy of the position where the substrate 10 with the BNC connector 13 is fixed to the chassis 9 as shown in FIG. The positioning is performed by providing one circular reference hole 11 and an oval long hole 12 into which the BNC connector 13 is inserted.

Hereinafter, a conventional method of positioning and fixing the substrate 10 to the chassis 9 will be described. The circular reference hole 11 has a hole size of φ (3 + 0.1-0), and the oval long hole 12 has a hole size of φ (3 + 0.1-0) × 5. It is located at some distance. The longitudinal direction of the oval elongated hole 12 is arranged so as to be parallel to a straight line connecting the center line of the circular reference hole 11 and the oval elongated hole 12. Further, in the chassis 9, round holes 14, 15, 16, etc. of φ4 or more for passing other BNC connectors and components are formed as relief holes.

[0005] When a hole is formed in the chassis 9 in this manner,
When the substrate 10 is fixed to the chassis 9, the position of the X axis-Y axis can be determined within a predetermined error range. further,
The height dimension of the BNC connector 13, that is, the spacer 8
The height of the chassis 9 and the board 10 is adjusted by interposing a spacer 17 having a height equal to the height of the ground lug 7 and the washer 5 at the position of the reference hole 11.

[0006]

As described above, conventionally, when the substrate 10 and the chassis 9 are positioned and the substrate 10 is fixed to the chassis 9, a circular reference hole 11 and an oval long hole 12 are provided. 9, and the hole shape, processing dimensions, and processing accuracy are different from each other.
I had to use many types of punches. In fixing the substrate 10 to the chassis 9, fastening means such as bolts 18 and nuts 19 are required, which increases man-hours and increases costs such as material costs and mounting costs.

In view of the above problems, the present invention does not require a complicated operation of fixing the substrate 10 to the chassis 9 by providing fastening means such as spacers 17 and bolts and nuts in the circular reference hole 11, The present invention proposes a substrate fixing method capable of positioning the chassis 9 and the substrate 10 and fixing the substrate 10 to the chassis 9 using only simple members, and a substrate fixing member used in the substrate fixing method.

[0008]

According to the present invention, there is provided a method of fixing a substrate to a chassis, comprising the steps of: fixing a substrate to the chassis from a longer diameter side of the insertion hole of the chassis having an insertion hole having a major axis and a minor axis; Insert a fixed plate-shaped member into the insertion hole,
Next, the substrate fixing plate-like member is rotated to the short diameter side to fix the substrate fixing plate-like member to the chassis. Due to the rotation of the substrate fixing plate-like member, the substrate fixing plate-like member is sandwiched by the chassis on the short diameter side of the insertion hole, deformed and fixed to the chassis.

[0009]

FIG. 1 shows a structure of a board fixing plate member 20 of the present invention and a state in which a board 22 is fixed to a chassis 21 using the board fixing plate member 20. The board fixing plate-shaped member 20 is manufactured by punching a solder-plated steel plate or the like, and as shown in FIG.
Head 20a, trunk 20 connected to head 20a in order from the top
b, a projection 20c connected to the body 20b is integrally provided. Between the head 20a and the torso 20b, the chassis 21 is rotated by rotation of the board fixing plate member 20 as described later.
A notch 20d is formed which fits the edge of and is sandwiched between the chassis. Further, a step 20e is provided under the body 20b.
Is formed, but the step portion 20e may be provided as needed.

FIGS. 1B and 1C show a substrate 22 and a chassis 21 using the substrate fixing plate member 20.
3 shows a main part plane and a main part cross section when the substrate 22 is fixed to the chassis 21 by performing the alignment with FIG. An insertion hole having a major axis and a minor axis, for example, an oval reference hole 23 is formed in the chassis 21, while a through hole 22 a into which the projection 20 c is inserted is formed in the substrate 22.

Here, the dimension between the minor axes of the oval-shaped reference holes 23 is defined as f, the dimension between the major axes is defined as g, and the substrate fixing plate member 20 is formed.
H>g>, where h is the horizontal dimension of the head 20a, i is the horizontal dimension between the notches 20d, and j is the horizontal dimension of the trunk 20b.
It is preferable that the dimensional relationship is j>i> f. With the above dimensional relationship, the position of the board fixing plate-shaped member 20 is determined only by inserting the board fixing plate-shaped member 20 into the reference hole 23 and pressing against the chassis 21 with h> g. Further, when g> j, the substrate fixing plate-shaped member 20 enters the reference hole 23, and when h> i, j> i, the substrate fixing plate-shaped member 20 does not come out vertically, and further, i
When> f, the substrate fixing plate member 20 is deformed by the rotation and can be securely fixed.

The substrate 22 having the through holes 22a formed in the chassis 21 having the reference holes 23 formed as described above.
1 is fixed using the substrate fixing plate-like member 20, the substrate fixing plate-like member 20 is inserted into the reference hole 23 at a long diameter side as shown by a chain line as shown in FIG. And
The protrusion 20c is inserted into the reference hole 23 until the tip of the step portion 20e contacts the substrate 22 through the through hole 22a, and is manually rotated by 90 degrees. Due to this rotation, the notch 20d is forcibly pinched to the shorter diameter side, the substrate fixing plate member 20 is deformed, and the substrate fixing plate member 20 is fixed to the chassis 21. Thereafter, the protrusion 20c and the substrate 22 are soldered from the back side of the substrate 22 to form the chassis 2
1, a substrate 22 is fixed via the substrate fixing plate-shaped member 20.

An embodiment in which the board with the coaxial connector such as the BNC connector and the chassis are positioned and the board is fixed to the chassis by using the board fixing plate member 20 with reference to FIGS. 2 and 3. I will explain it. FIG.
As shown in FIG.
3. An oval reference hole 24 through which the BNC connector passes, and a circular relief hole 25 having a size such that it passes through other BNC connectors and other parts without contacting the chassis 21.
6, 27 and 28 are formed as required.
Here, the reference hole 24 extends parallel to the center line of the reference hole 23.
The accuracy in the Y-axis direction can be ensured by arranging the longitudinal directions.

On the other hand, as shown in FIG. 1C, a through hole 22a is formed in the substrate 22 so that the protrusion 20c of the substrate fixing plate member 20 or the center connector 1 of the BNC connector is inserted and soldered. Have been.

Next, an assembling method for fixing the board 22 with the BNC connector to the chassis 21 using the board fixing plate member 20 will be described with reference to FIGS. First, BN is inserted into the reference hole 24 of the chassis 21.
It is temporarily fixed with the locking washer 4 and the mounting nut 6 through the C connector 29.

Next, the board fixing plate-like member 20 is inserted into the reference hole 23 and the projection 20c is made to protrude from the through hole 22a provided in the board 22. Rotate degrees. This rotation operation is stopped so that the notch 20d formed in the board fixing plate-shaped member 20 is sandwiched between the chassis 21 on the short diameter side of the reference hole 23.

Thus, a reference position of the substrate 22 and the chassis 21 in the reference hole 23, that is, a position in the Y-axis direction is determined. When the reference position is determined, the BN
The BNC connector 29 is fastened to the chassis 21 by rotating the mounting nut 6 of the C connector 29.

Thereafter, the projection 20c of the board fixing plate member 20 is soldered from the back side of the board 22
2 is fixed to the chassis 21. Since this soldering work can be performed simultaneously with the soldering of other components, the work of fastening with bolts and nuts as in the related art is eliminated, and the number of steps can be reduced accordingly.

Adjustment of the distance between the board 22 and the chassis 21 in the Z-axis direction is performed at the position where the BNC connector 29 is attached, as shown in FIG. It is determined by the sum Z of the seat dimension, the earth lug dimension, and the washer dimension, and at the position of the substrate fixing plate member 20, the trunk portion 20 of the substrate fixing plate member 20 is located.
b, determined by the dimension of the step portion 20e in the Z-axis direction. Therefore, in order to make the spacing dimension uniform, the dimensions of the spacer 8 of the BNC connector 29, the dimensions of the ground lug 7, and the dimensions of the washer 5 are known in advance. The member 20 can be easily manufactured by punching or the like.

In the above-described embodiment, the BNC connector 29 is provided at the position of the reference hole 24. However, when a board to which the BNC connector is not used is used, the two reference holes 23 and 24 have the same shape. By adopting the oval shape, it is possible to position and fix the chassis and the substrate at the positions of the two reference holes by using the substrate fixing plate member 20. As a result, the diversion can be performed without changing the specifications of the board and the chassis.

[0021]

According to the present invention, the alignment between the chassis and the substrate and the fixing of the substrate to the chassis are facilitated by merely inserting the substrate fixing plate member into the hole formed in the chassis and rotating the same. In addition, the number of fixed work steps can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a substrate fixing plate member used in the present invention and a method of fixing a substrate to a chassis using the substrate fixing plate member.

FIG. 2 is a plan view of an example of a chassis used in the present invention.

FIG. 3 is an explanatory view of a fixing method of the present invention for fixing a board with a BNC connector to a chassis.

FIG. 4 is an explanatory view of a conventional fixing method for fixing a board with a BNC connector to a chassis.

FIG. 5 is an external view and an internal cross-sectional view of the BNC connector.

[Explanation of symbols]

20 .. board fixing plate member 21 .. chassis 22.
· Boards 23, 24 · · · Oval reference holes formed in the chassis 29 · · · BNC connectors

Claims (6)

[Claims] 1. A board having at least one insertion hole having a major axis and a minor axis, and a board fixing plate member for fixing a substrate to the chassis is inserted into at least one of the insertion holes from a major axis side of the insertion hole. Next, the substrate fixing plate-like member is rotated to the short diameter side to fix the substrate fixing plate-like member to a chassis, and then the substrate is fixed to the substrate fixing plate-like member. How to fix the board to the chassis. 2. The method according to claim 1, wherein the board is fixed to the board fixing plate by soldering. 3. The method according to claim 1, wherein the insertion hole having the major axis and the minor axis is an oval-shaped insertion hole. 4. The method according to claim 1, wherein the insertion hole is used as a reference hole for aligning the chassis with the substrate. 5. Inserting the coaxial connector of the board to which the coaxial connector is electrically connected into an alignment reference hole having a major axis and a minor axis of the chassis, and then determining the major axis and the minor axis of the chassis. Insert a board fixing plate-like member for fixing the substrate to the chassis from the longer diameter side of the other positioning reference hole having the other positioning reference hole, and rotate the board fixing plate-like member to the shorter diameter side. Fixing the substrate fixing plate-shaped member to a chassis, and then fastening the coaxial connector inserted into the positioning reference hole to the chassis by fastening means of the coaxial connector. Fixing method. 6. A chassis formed of one sheet and having an insertion hole having a major axis and a minor axis, is inserted into the insertion hole from the major axis side of the insertion hole toward the substrate, and the minor axis side of the insertion hole. A board fixing plate-shaped member, which is fixed to the chassis by being rotated to the side.