CN1100475C

CN1100475C - Connecting structure of frame and printed circuit board

Info

Publication number: CN1100475C
Application number: CN98102383A
Authority: CN
Inventors: 山本正喜; 铃木典雄
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 1997-06-10
Filing date: 1998-06-10
Publication date: 2003-01-29
Anticipated expiration: 2018-06-10
Also published as: JPH10341087A; KR19990003854U; KR200200102Y1; CN1204941A

Abstract

Provided is a connection structure between a frame and a printed circuit board. This connection structure includes a frame made of a metallic plate and a printed circuit board disposed within the frame. The frame has a sidewall and a tongue piece, integrally formed with the sidewall. The tongue piece has a holder piece, extended in a longitudinal direction of the sidewall, which is flush with the sidewall, a bent piece extending from the holder so as to slant inward of the frame, and a loose end extended parallel to the side wall of the frame and downward from one end of the bent piece. The board and the loose end of the tongue piece of the frame are fixed by soldering.

Description

Framework and connecting structure of printed circuit board

The present invention relates to a kind of framework and connecting structure of printed circuit board, be applicable to that the printed circuit board (PCB) that television set tuner, modulator and so on will constitute electronic circuit is disposed at the electronic equipment of making in the metallic plate framework.

Fig. 4 is the stereogram of the existing electronic equipment major part of expression, Fig. 5 is the exploded perspective view of the electronic equipment assembling situation of key diagram 4, Fig. 6 is the major part stereogram of existing framework of explanation and printed circuit board connecting structure, and Fig. 7 is the major part sectional view along the B-B line of Fig. 6.

As shown in Figure 4 to 7, the rectangular box framework 10 that is made of metallic plate has the sidewall 10a that the four sides is fenced up, opening portion, the top 10b and opening portion, the below 10c that are formed by sidewall 10a.Below sidewall 10a, be formed with several (for example 4) notch 10d.

Printed circuit board (PCB) 11 is rectangles, adorning electronic units (not expressing among the figure) such as integrated circuit, coil, chip on its surface with the inside, several (for example 4) outstanding to the outside protuberance 11a is arranged in its end, in addition in the end fixed position be formed with several conducting positions 11b.This conducting position 11b is provided with for framework 10 ground connection.

Between the end face of the sidewall 10a of framework 10 and printed circuit board (PCB) 11, press fixed width dimensions t2 form gap 13 (with reference to Fig. 7), this gap 13 is provided with in order easily printed circuit board (PCB) 11 to be contained in the framework 10.

This printed circuit board (PCB) 11 is disposed in the framework 10, and the conducting position 11b that forms in the end of this printed circuit board (PCB) 11 and the sidewall 10a of framework 10 live with braze 12 welderings, and conducting position 11b makes framework 10 ground connection.

Below, the assembling of above-mentioned electronic equipment is described.

At first, printed circuit board (PCB) 11 is inserted the opening portion 10c of framework 10 belows, the protuberance 11a of printed circuit board (PCB) 11 and the notch 10d of framework 10 are fastened, printed circuit board (PCB) 11 is temporarily fixed in the framework 10.Then, coating paste soldering material 12 on the conducting position 11b that the end of printed circuit board (PCB) 11 institute allocation forms, under the state that has applied paste soldering material 12, framework 10 put into heating furnace (not expressing among the figure), braze is melted, the conducting position 11b of printed circuit board (PCB) 11 and the sidewall 10a of framework 10 are carried out soldering.

At this moment, braze 12 is filled into the gap between framework 10 and the printed circuit board (PCB) 11, two side welds are lived, framework 10 with printed circuit board (PCB) 11 connection status.

But, existing framework and connecting structure of printed circuit board, in tests such as temperature cycles, stretching of can causing because of the difference of framework 10 and 11 thermal expansions of printed circuit board (PCB) produces crooked in X, Y direction (ginseng Fig. 4).This crooked, for example when printed circuit board (PCB) 11 extends because of expansion (arrow X1, Y1 direction), to each braze 12 applied thrust, (arrow X2, Y2 direction) then applies pulling force to each braze 12 when shortening because of contraction.

After each braze 12 was subjected to the flexible pulling force or thrust that each braze 12 is applied because of this printed circuit board (PCB) 11, braze 12 may produce be full of cracks, perhaps fracture, and framework 10 was destroyed with being connected of printed circuit board (PCB) 11, the generation problem of unstable.

In addition, in existing framework and connecting structure of printed circuit board, only between the sidewall 10a of framework 10 and conducting position 11b printed circuit board (PCB) 11 above, just be connected with braze 12, owing to the connection area is less, the mechanical connection of framework and printed circuit board (PCB) a little less than.

The present invention finishes in order to address the above problem, even it is crooked to its objective is that the coupling part that a kind of framework and printed circuit board (PCB) are provided produces, and the syndeton that the coupling part also can not be damaged.

Framework of the present invention and connecting structure of printed circuit board, have and constitute by metallic plate, sidewall is arranged and with the framework of the integrally formed tongue piece of this sidewall be disposed in this framework, the printed circuit board (PCB) that crestal surface is arranged, above-mentioned tongue piece, by with sidewall at grade, horizontal expansion to sidewall, the maintaining part that one end thereof connects together with sidewall, connect together with another end with this maintaining part, and from the curved tabs of sidewall to the setting of framework inner inclination, and extend the breakaway end portion that is provided with from another end of this curved tabs to the sidewall parallel longitudinal and constitute, the crestal surface of above-mentioned printed circuit board (PCB) and the breakaway end portion of above-mentioned tongue piece are fixed with soldering.

In addition, framework of the present invention and connecting structure of printed circuit board on the corresponding position of breakaway end portion of the tongue piece of printed circuit board (PCB) and said frame, are formed with notch, are formed with crestal surface at the inner peripheral surface of this notch.

Fig. 1 is the major part stereogram of explanation framework of the present invention and printed circuit board connecting structure.

Fig. 2 is the major part sectional view along the A-A line of Fig. 1.

Fig. 3 is the major part stereogram of explanation electronic equipment of the present invention with printed circuit board (PCB).

Fig. 4 is the stereogram of the existing electronic equipment major part of expression.

Fig. 5 is the exploded perspective view of the electronic equipment assembling situation of key diagram 4.

Fig. 6 is the major part stereogram of existing framework of explanation and printed circuit board connecting structure.

Fig. 7 is the major part sectional view along the B-B line of Fig. 6.

Fig. 1 is the major part stereogram of explanation framework of the present invention and printed circuit board connecting structure, and Fig. 2 is the major part sectional view along the A-A line of Fig. 1, and Fig. 3 is the major part stereogram of explanation electronic equipment of the present invention with printed circuit board (PCB).

As Fig. 1～shown in Figure 3, framework and connecting structure of printed circuit board, have constitute by metallic plate, rectangular box framework 1, and the printed circuit board (PCB) 2 that is disposed at framework 1 inside.

Framework 1 has the sidewall 1a that fences up of four sides, and the top and opening portion, below (not the expressing among the figure) that are formed by sidewall 1a.On each position of sidewall 1a at four sides, through die-cut, be bent to form the some tongue piece 1b with sidewall 1a one.On the sidewall 1a that metallic plate constitutes through tongue piece 1b die-cut, that be bent to form, have with sidewall 1a at grade, along sidewall 1a horizontal expansion setting, the maintaining part 1c that the end connects together with sidewall, connect together with another end with this maintaining part 1c, and the curved tabs 1d that is provided with to the framework inner inclination from the inside of sidewall 1a, and from another end of this curved tabs 1d to sidewall 1a vertically, extend the rectangle breakaway end portion 1e that is provided with the parallel sidewalls of said frame.

Printed circuit board (PCB) 2, adorning for example electronic units (not expressing among the figure) such as integrated circuit, coil, chip on its surface with the inside, be formed with notch 2a in the corresponding position of tongue piece 1b, at the soldering crestal surface 2c of ways such as the useful electroless plating of the inner peripheral surface 2b of this notch 2a formation with framework 1.On the surface of printed circuit board (PCB) 2, be formed with conducting position 2d, the end of conducting position 2d is provided with crestal surface 2e.The crestal surface 2e on printed circuit board (PCB) 2 surfaces is connected with the crestal surface 2c of notch 2a.

The bottom of the breakaway end portion 1e of tongue piece 1b is relative with the inner peripheral surface 2b of the notch 2a of printed circuit board (PCB) 2.Between notch 2a and breakaway end portion 1e, press fixed width dimensions 11 form gaps 4.

The crestal surface 2c of the inner peripheral surface 2b of above-mentioned notch 2a and the crestal surface 2e of printed circuit board (PCB) 2 live with braze 3 welderings, by this braze 3, the crestal surface 2c that on the notch 2a of printed circuit board (PCB) 2, forms, and the end crestal surface 2e of above-mentioned conducting position 2d is connected with the breakaway end portion 1e of tongue piece 1b.By carrying out soldering at this crestal surface 2c, notch 2a is connected with braze 3 with breakaway end portion 1e.

Below, the assembling of this framework and connecting structure of printed circuit board is described.

At first, with pack into the opening portion (not expressing among the figure) of framework 1 below of printed circuit board (PCB) 2, printed circuit board (PCB) 2 is temporarily fixed in the framework 1.Under this temporary fixed state, the breakaway end portion 1e of the tongue piece 1b of framework 1 is relative with the notch 2a of printed circuit board (PCB) 2.Then, coating paste soldering material 3 on crestal surface 2c that forms in the position relative and the end crestal surface 2e of conducting position 2d with breakaway end portion 1e and notch 2a, under the state that has applied paste soldering material 3, put framework 1 and printed circuit board (PCB) 2 into heating furnace (not expressing among the figure), braze 3 is melted, the tongue piece 1b of printed circuit board (PCB) 2 and framework 1 is carried out soldering.Because at this moment the inner peripheral surface 2b of notch 2a goes up the crestal surface 2c that forms and also is coated with apposition paste soldering material 3, so the inner peripheral surface 2b of the bottom of breakaway end portion 1e and notch 2a goes up the crestal surface 2c of formation also by soldering.

By connecting the braze 3 of this breakaway end portion 1e and crestal surface 2c, and the braze 3 that connects breakaway end portion 1e and the end crestal surface 2e of conducting position 2d, the bottom of printed circuit board (PCB) 2 and breakaway end portion 1e is linked together securely by enough braze of area.

By soldering, framework 1 has been finished with assembling just of printed circuit board (PCB) 2.

Electronic equipment with framework of the present invention and connecting structure of printed circuit board is carried out temperature cycling test.Even produce between framework 1 and the printed circuit board (PCB) 2 because of the thermal expansion of temperature cycles etc. causes flexible poor, this flexible difference causes is crookedly also digested by the mobile of the tongue piece 1b of framework 1, and the connection by braze 3 is not damaged.

Below, the crooked situation that the flexible difference that the tongue piece 1b digestive fever of framework 1 is expanded causes describes.

At first, because thermal expansion, 2 pairs of frameworks 1 of printed circuit board (PCB) move by arrow X1 shown in Figure 1, the direction of Y1, and braze 3 applied thrusts to the crestal surface 2c, the 2e that are welded in printed circuit board (PCB) 2 digest but this thrust is configured maintaining part 1c and the curved tabs 1d of each tongue piece 1b.This is moving because of the X1 that is done by 2 pairs of frameworks 1 of printed circuit board (PCB), Y1 direction, the sweep at curved tabs 1d two ends is made hinge action, perhaps crooked more, perhaps extensional forward, maintaining part 1c outwards is out of shape from sidewall 1a, and the thrust that braze 3 is produced that moves of the X1 that will be done because of printed circuit board (PCB) 2, Y1 direction digests.

Secondly, because shrink, 2 pairs of frameworks 1 of printed circuit board (PCB) move by arrow X2 shown in Figure 1, the direction of Y2, and braze 3 is applied pulling force, but this pulling force is configured maintaining part 1c and the curved tabs 1d of each tongue piece 1b, and same action is digested with expansion the time.

Framework of the present invention and connecting structure of printed circuit board, the sidewall 1a that constitutes framework 1 is gone up the breakaway end portion 1e of integrally formed some tongue piece 1b and the crestal surface 2c of printed circuit board (PCB) 2, crestal surface 2e lives with the soldering weldering, by each tongue piece, printed circuit board (PCB) can be done directions X to framework, moving of the slight distance of Y direction, even the flexible difference that causes because of thermal expansion etc. between test middle frames such as temperature cycles and printed circuit board (PCB) produces crooked, 2 pairs of frameworks of printed circuit board (PCB) 1 produce and move, braze 3 pulling force or thrust have been applied, this crooked also can maintained portion 1c, the tongue piece 1b that curved tabs 1d and breakaway end portion 1e constitute digests, and has the effect that the connection of braze 3 is not damaged.

In addition, framework of the present invention and connecting structure of printed circuit board, form crestal surface by inner peripheral surface at the notch of printed circuit board (PCB), when being connected to printed circuit board (PCB) on the framework with soldering, crestal surface with printed circuit board (PCB) has also connected again, the crestal surface that has also added inner peripheral surface is connected with the soldering of the tongue piece of framework, because the soldering area that connects is abundant, can obtain the stable effect of connection.

Claims

1. framework and connecting structure of printed circuit board, it is characterized in that having and constitute by metallic plate, have sidewall and with the framework of the integrally formed tongue piece of this sidewall, be disposed in this framework, the printed circuit board (PCB) that crestal surface is arranged, above-mentioned tongue piece, connect together with sidewall and to the maintaining part of the horizontal expansion of sidewall by an end, connect together with another end with this maintaining part, and from the curved tabs of sidewall to the setting of framework inner inclination, and extend the breakaway end portion that is provided with from another end of this curved tabs to the sidewall parallel longitudinal and constitute, the crestal surface of above-mentioned printed circuit board (PCB) and the breakaway end portion of above-mentioned tongue piece are fixed with soldering.

2. framework according to claim 1 and connecting structure of printed circuit board is characterized in that on above-mentioned printed circuit board (PCB), are being formed with notch with the corresponding position of the breakaway end portion of above-mentioned tongue piece, are formed with crestal surface at the inner peripheral surface of this notch.