JP3002386B2 - PCB holding structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding structure for fixing a printed circuit board of an electronic device or the like to a metal frame also serving as a shield case.

[0002]

2. Description of the Related Art In general, a printed circuit board holding structure in which a printed circuit board on which an electronic circuit for handling harmonics is formed is mounted in a frame body includes, for example, a side plate of the frame body and an internal board. A plurality of receiving portions and tongue pieces are provided and placed on the shielded plate, etc., and the printed circuit board is placed on the receiving portion,
A method has been adopted in which the printed circuit board is locked by bending the tongue piece in the direction of the printed circuit board, and the tongue piece is further soldered to an earth pattern provided on the printed circuit board.

[0003] However, the connection between the pattern of the electronic circuit formed on the printed circuit board and the pattern of the electronic circuit formed on the motherboard of a set device or the like on which the pattern is mounted,
Normally, the terminals provided on the printed circuit board are projected from the frame body, and the projected terminals are inserted into connection holes formed on the motherboard of a set device or the like, and are soldered to the pattern on the printed circuit board by soldering. Will be In such a frame of an electronic device or the like, at least one side plate must be cut out in a U-shape in order to protrude a terminal provided on a printed circuit board.

[0004] However, conventionally, even in a frame body in which one side plate is cut out in a U-shape, since a printed board holding structure similar to that described above is employed, a portion cut out in a U-shape is conventionally used. However, it was difficult to provide a tongue piece on one side plate, and it was not possible to sufficiently hold the printed board on the frame at that location. As shown in FIG. 7 and FIG. 9, 1b is a metal frame having upper and lower openings and at least one side plate cut out in a U-shape. 1b is formed on two opposite side plates, and a frame 1b is provided on a motherboard such as a set device, and an earth portion having earth terminals B and C for connecting to an earth pattern on the motherboard.
b is a shield plate installed between a side plate 10 cut in a U-shape and another side plate 11 facing the side plate 10 and protruding from an edge 2 a of the shield plate 2. Part 2
b is formed. Reference numeral 3 denotes a printed circuit board having a through hole that is inserted corresponding to the projecting portion 2b of the shield plate 2,
The printed circuit board has an earth pattern for soldering around the through hole, and a terminal 7 is provided on the component mounting surface on the back surface. Reference numeral 4a denotes a tongue formed by cutting the side plate of the frame 1b, and reference numeral 4b denotes a step formed by cutting the side plate of the frame 1b (receiving the printed circuit board 3). This frame 1b
The position of the tongue piece 4a formed on the side plate and the position of the side edge surface 2a of the shield plate 2 are set at a predetermined height, and the printed circuit board 3 is placed thereon.

Next, a method of holding the printed circuit board 3 in the frame 1b will be described. First, the printed circuit board 3 is mounted in the frame 1b such that a part of the component mounting surface is placed on the step 4b and the terminals 7 protrude from the side plate 10 cut out in a U-shape. However, at this time, the printed board 3 is inserted into the through hole formed in the printed board 3 so as to correspond to the projecting portion 2b of the shield plate 2 and the edge 2a of the shield plate 2 and the stepped portion of the frame 1b. 4b. Then, the holding of the printed circuit board 3 is fixed by pressing and bending the tongue piece 4a toward the printed circuit board 3 inward from the outside of the frame 1b as shown in FIG.
Next, the tongue piece 4a pressed and bent on the printed circuit board 3 is fixed to the ground pattern provided on the printed circuit board 3 with solder 15. At the same time, the protruding portion 2b of the shield plate 2 inserted into the through hole of the printed circuit board 3 is also fixed by solder 15 to the ground pattern formed around the through hole at the tip end. Incidentally, these soldering methods are generally carried out through a flow and reflow furnace or the like.

The printed circuit board 3 on which the electronic circuit is formed as described above is provided inside the frame 1b and held by the frame. The frame 1b holding the printed board 3 is erected on a motherboard such as a set device (not shown) and soldered to an electronic circuit pattern and a ground pattern formed on the motherboard.

[0007]

However, in such a conventional printed circuit board holding structure as described above,
There were the following problems. That is, in the structure in which the terminal 7 provided on the printed board 3 is protruded from the side plate 10 in which one side plate of the frame 1b is cut out in a U-shape, as the number of the terminals 7 provided on the printed board 3 increases, the frame becomes larger. Since the length of the U-shaped cutout along the side of the side plate 10 of the body 1b becomes longer, there is no space for providing the tongue piece 4a on the side plate 10 of the frame 1b by that length.

For example, in the conventional example, the number of tongue pieces 4a that can be provided on the side plate 10 is limited to at most about one as shown in FIGS. Therefore, the holding force for holding the printed circuit board 3 on the frame 1b is necessarily extremely weak on the side plate 10 side than on the other side plate 11 facing the side plate 10. Therefore, the projecting portion 2b and the tongue piece 4a of the shield plate 2 are
When the printed circuit board 3 is fixed at 5, the printed circuit board 3 warps due to the solder heat of the flow and the solder flow force thereof, the heat of the reflow and the hot wind or the vibration of a conveyor or the like passing them through a furnace and the heat at the time of soldering. As a result, they move from a predetermined position fixed to the frame 1b. Then, since it is fixed to the position moved from the predetermined position by the solder 15, the one side plate 1 cut out in a U-shape of the frame 1b.
There is a problem that the terminal 7 protruding from 0 is shifted from a predetermined position. If the terminal 7 is to be mounted on a motherboard such as a set device while the terminal 7 is deviated from a predetermined position, the ground terminals B and C of the frame 1b are formed on the motherboard such as the set device. Even if the terminal 7 is inserted into the mounting hole, the terminal 7 does not enter the mounting hole formed on the motherboard of the set device or the like, so that the terminal 7 cannot be mounted. Further, if this is forcibly pushed into the motherboard of a set device or the like, there arises a problem that the terminal 7 is bent or the printed circuit board 3 is damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made in view of the above circumstances, and has been made in view of the above circumstances. An object of the present invention is to provide a substrate holding structure.

[0010]

SUMMARY OF THE INVENTION A printing base according to the present invention
The board holding structure is a printed circuit board with terminals protruding from the end
With multiple side plates, open up and down, print inside
And a metal frame fitted with a substrate, the side plates of the frame small
At least one is U-shaped with steps on both sides and open upwards
From the part of the step with the notch and the width of approximately the thickness of the frame
The terminal extends from the notch of the frame
The printed circuit board on the step of the frame
Fold parallel to the ridge formed by the top and end surfaces of the lint substrate
Printed circuit board by nails and steps of frame body bent by wire
Is held in a frame .

[0011]

The above technical means operates as follows. In the printed circuit board holding structure having such a configuration, a part of the printed circuit board having one side plate protruding from a frame body cut out in a U-shape is placed on the step portion, and the frame body is formed in a U-shape. The printed board is held in the frame by fixing the printed board with nails formed at one or both edges of the cutout.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a printed circuit board holding structure according to the present invention. FIG. 1 is a perspective view showing a printed circuit board holding structure according to an embodiment of the present invention, and FIG. 2 is an explanatory view of a method of mounting and holding and fixing the printed circuit board in a frame according to the embodiment. FIGS. 3 to 6 are a cross-sectional view and an enlarged perspective view of a main part of the printed circuit board holding structure according to the embodiment, in which the steps and the tongue pieces are bent.

In these figures, the same reference numerals are given to the same components in the configuration of the conventional example and the embodiments of FIGS. 1 to 6 of the present invention, and the description thereof will be omitted. FIG.
6 is remarkably different from the conventional example in the side plate 10 in which one side plate of the frame 1b is cut out in a U-shape, and in the embodiment, both edges in which the side plate 10 is cut out in a U-shape. There is a difference in a configuration in which the claw 5a cut and formed on one or both sides of the end is bent inward from the outside of the frame 1b to hold the printed board 3 firmly. in this way,
A frame body in which a claw 5a was formed on a side plate 10 in which one side plate was cut out in a U-shape was designated as 1a. Other configurations are the same as the conventional example.

[0014] In the present invention, the nail 5a, as shown in FIG. 1, open the missing-out upward off the side plate 10 in a U-shaped frame 1a
On one or both sides of the stomach notch, a simple rectangular shape which is formed narrowing cut from above the frame in a substantially plate pressure of the width of the side plate 10
Have . Then, as shown in FIG. 4, the claw 5a is bent inside the frame 1a and bent until it contacts the printed circuit board 3 (about 45 degrees in the figure) . The width of the nail 5a Waso is Ino Oh Ri fine substantially plate thickness amount, because the resistance force against the bending is not so large, without consuming excessive force to the printed circuit board 3, the upper surface of the printed circuit board 3, i.e. soldering Between the face and the end face
It can be bent by contacting the formed ridge . or,
This damage such as cracking or warp in the printed circuit board 3 occurs such have a.

[0015]

As described above, according to the present invention, the printed circuit board is placed on the stepped portion, and the side plate of the frame is formed on one or both sides of both edges of the U-shaped notch. The printed circuit board can be pressed and held against the step by bending the claw inward, so that the printed circuit board is firmly inserted into the frame body in combination with the tongue pieces formed on the side faces that are not notched in a U-shape. When soldering by pressing the printed circuit board, it is possible to obtain an effect that the movement of the printed circuit board can be eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a printed circuit board holding structure according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method of mounting and holding the printed circuit board on a frame according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a cut portion taken along line AA ′ of FIGS. 1 and 2 in the printed circuit board holding structure according to the embodiment of the present invention.

FIG. 4 is an enlarged perspective view of a main part showing the main part in the printed circuit board holding structure according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a cut portion taken along the line BB ′ of FIGS. 1 and 2 in the printed circuit board holding structure according to the embodiment of the present invention.

FIG. 6 is an enlarged perspective view showing a main part of the printed circuit board holding structure according to the embodiment of the present invention.

FIG. 7 is a perspective view showing a printed circuit board holding structure according to a conventional example.

FIG. 8 is an explanatory diagram of a method of mounting and holding the same printed circuit board on a frame according to a conventional example.

FIG. 9 is an enlarged perspective view of a main part showing a main part in the printed circuit board holding structure according to a conventional example.

FIG. 10 is a cross-sectional view showing a cut section taken along the line CC ′ of FIGS. 7 and 8 in the printed circuit board holding structure according to the conventional example.

[Explanation of symbols]

 Reference Signs List 1a Metal frame 2 Shield plate 3 Printed circuit board 4a Tongue piece 4b Step 5a Claw 7 Terminal 10 Opening side plate of metal frame 15 Solder

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/04 H05K 7/14 H05K 9/00

Claims (1)

(57) [Claims] 1. A printed board in which terminals protruding from the end portion, upper and lower opened with a plurality of side plates, said pre therein
A metal frame on which a printed circuit board is mounted, and at least one of the side plates of the frame has a step on both sides.
A U-shaped notch opened upward, and a substantially plate thickness of the frame body
A claw extending from a part of the step portion to a position above the frame body in width;
Then, the terminal is projected outside from the cutout portion of the frame body.
Place the printed circuit board on the step of the frame, and
Curve parallel to the ridge formed by the top and end surfaces of the printed circuit board
The pudding by the claws and the steps of the frame body bent at
A printed circuit board holding structure, wherein the printed circuit board is held by a frame .