JPH03185794A - Two-step structure for fixing substrate - Google Patents

Abstract

PURPOSE:To enable selecting the physical fitting relation between a substrate and a claw from two phases by forming the fitting claw having a double-length root and making cuts alternately on both sides of the claw. CONSTITUTION:A substrate fixation apparatus is formed in a sheet metal lower case 1 by cutting and raising and equipped with a wide first supporting base 14 which is D in height. A second supporting base 13 of smaller length W and (x) in height is formed on the upper center of the first supporting base 14 and a fixation claw 11 of still smaller length N is formed on the upper center of the second supporting base 13. A first slit 12 is made in the left side of the lower end of the fixation claw 11 and a second slit 15 is made in a height of Z from the right side of the lower end thereof. The oblique upper sides 12a and 15a of the first and second slits 12 and 15 are upward toward the outside and the oblique upper side 11a of the fixation claw 11 is downward to the left. thereby the fixation position of a substrate can be selected only by changing the length of the rectangular hole of the substrate and using one claw.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a mating claw for fixing a circuit board to a chassis, etc., in which the width of the base portion of the claw is set in two stages, and the width of the claw is set in two stages, and the widths of the claws are different from each other on both sides of the claw. By providing the notches, the fitting positional relationship between the board and the claw can be selected in two stages.

[Prior Art] Fig. 8 is a schematic perspective view of an audio device developed as a series of unified designs, in which (a) is a cassette tape player, (b) is a DAT (digital audio tape) player, and (C) is a It's a CD player. As shown in the figure, each player has a case 1 and a front panel 2 that have the same shape, and the front panel 2 has a C cassette insertion slot 3, a DAT cassette slot 4, and a C
A D insertion port 5 is provided.

Figure 9 shows the internal structure of such a player.
The lower case 1 and the main board 6 are fixed using claws 11 provided on the lower case 1.

Products that are made into a series with a unified design have many parts in common, such as external dimensions and various specifications, and a large number of the parts used in them are designed so that they can be used in common.

[Problems to be Solved by the Invention] However, with the structure in which the board is fixed in this way, various conditions such as differences in the specifications of the mechanisms used and differences in the height of electronic components arranged on the board may cause problems. In some cases, the distance between the lower case 1 and the main board 6, indicated by A in FIG. 9, cannot be made common.

If this interval A is different, the height of the claws must also be changed, and the lower case 1 cannot be shared.

Therefore, when manufacturing the lower case 1 using a metal mold, only the process for processing the claws 11 had to be made using a residual mold, which caused an increase in the product price.

In addition, a plurality of claws with different mounting heights are provided on the lower case 1,
A claw-receiving pedestal is provided on the board side in a part that corresponds to a claw of a height that can be used, and a larger hole is made in a part of the board side that corresponds to a claw of an unusable height to allow this claw to escape. However, there is a drawback that more holes than necessary are formed in the cutting board 6, and the usable area of the substrate is reduced.

Therefore, the present invention has been made with the object of providing a board mounting claw structure that allows the mounting position of the board to be selected in two stages as necessary and that allows the mounting space to be extremely small. be.

[Means for Solving the Problems] A substrate fixing claw structure according to the present invention includes a first support stand that supports a substrate, and a nail structure that is narrower than the first support stand and that is narrower than the first support stand and that is narrower than the first support stand and that is narrower than the first support stand. a second support base having a height lower than the thickness; a fixed claw located at the upper part of the second support base and formed narrower than the second support base; and a fixed claw provided on one side of the fixed claw. a first slit whose height from the second support base to the top of the opening end is lower than the thickness of the substrate; and a first slit provided on the other side of the fixed claw and whose height from the second support base to the top of the opening end is lower than the thickness of the substrate. A second slit that is thicker than the substrate is formed of a sheet metal, and at least the upper sides of the first and second slits are inclined so that the back side of the slit is narrowed.

Further, a first support stand supporting the substrate, a second support stand located above the first support stand and having a width narrower than the first support stand and a height lower than the thickness of the substrate; a fixing claw located at the top of the support base and formed narrower than the second support base; and a fixed claw provided on one side of the fixation claw, the height of which is the height from the second support base to the top of the opening end of the substrate. with a first slit having a thickness lower than that of the first slit.

A second slit is provided on the other side of the fixing claw and has a height higher than the thickness of the substrate from the second support stand to the top of the opening end, and the substrate is placed on the first support stand. When the substrate is supported on the second support, the lateral movement of the substrate is restricted by both ends of the second support, and when the substrate is supported on the second support, the upper end of the opening of the first slit and the The lateral movement of the substrate is restricted by the lower end side of the opening of the second slit.

[Operation] Since the present invention requires the above configuration, the substrate can be fixed using either the first or second slit depending on the height.

Embodiment FIG. 1 shows the shape of a claw according to an embodiment of the present invention. Further, FIGS. 2 and 3 show the state of use thereof, with (a) being a sectional view and (b) being a perspective view, respectively.

In FIG. 1, a substrate fixing device is formed in a lower case 1 made of sheet metal by cutting and bending. This substrate fixing device is provided with a first support stand 14 having a wide width and a height D, and a second support stand 13 having a narrower width W and a height X is provided at the upper center of the first support stand 14. A fixing claw 11 having a narrower width N is provided at the center of the upper part of the second support base 13.

The fixing claw 11 has a first
A slit 12 is provided, and a second slit 15 is provided on the right side at a position separated by a height Z from the bottom.

Here, the upper side 12 of the first and second slits 12 and 15
a and 15a are oblique sides that become higher toward the outside, and the upper side 11a of the fixed claw 11 is an oblique side that slopes downward to the left in the figure.

The operation of the substrate fixing device having the above configuration will be explained using FIGS. 2 and 3.

First, the first mounting state will be explained using FIG. 2.

The main board 6 has a pxW square hole having a width approximately equal to P, where the thickness of the claw 11 of this embodiment is P, and a length approximately equal to the width W of the second support base 13. 30 are provided. When the claw 11 is inserted into the square hole 30 of the substrate 6, the substrate 6 is moved to the first support stand 14 as shown in FIG. 2(a).
In this state, the lower surface of the substrate 6 and the upper surface of the lower case 1 have a gap D1' shown in FIG. 1 in this state. Further, both ends 13a of the second support base 13 in the left and right direction in the figure.

The position is fixed at 13a. Here, the height X of the first support stand 13 is made smaller than the plate thickness T of the main board 6. Further, the first slit 1 provided on one side of the claw 11
The upper side 12a of the substrate 6 is the oblique side as described above, and its approximately central portion is at the same height as the upper surface of the substrate 6.

That is, the height of the opening end of the first slit 12 from the second support base 13 is set to x < T < x + 1, where y is the height from the second support base 13 .

Therefore, as shown in FIG. 2(b), the head of the claw 11 has an arrow A.
When a twisting force is applied as shown in the figure, the twisting force is concentrated on the small diameter portion sandwiched between the first slit 12 and the second slit 15, and the claw 11 is twisted. As a result, the substantially central portion of the upper side 12a of the first slit 12 is deformed so as to press the upper surface of the substrate 6, and the substrate 6 can be fixed.

Next, regarding the second installation state, as shown in Fig. 3,
A substrate 6 having a square hole 31 with a dimension NXP and a length equal to the width N of the claw 11 is assembled.

That is, when the claw 11 is inserted into the board 6 having the square hole 31 of NXP, the board 6 passes the claw 11, that is, the second
It hits the top of the support stand 13. In this state, there is a gap of D+x between the lower surface of the substrate 6 and the upper surface of the casing 1.

In addition, in the left and right direction in Figure 1, one side is the first
The upper side 11b of the slit 12 opening, the other side with the claw 1
The position is fixed at the lower side 11c of the second slit opening of No. 1. Here, the distance Z between the lower side of the second slit 15 and the upper side of the second support base 13 is set to a value smaller than the thickness T of the main board 6. Further, the distance between the upper side of the second support stand 13 and the approximate center of the upper side 15a of the second slit is the thickness T of the substrate 6, that is, the lower side of the opening end of the second slit 15. Letting the height from 11c be R, Z<
It is set so that T<Z+R.

In this state, arrow B in FIG. 3(b) is drawn on the head of the claw 11.
When a twisting force is applied as shown in the figure, the twisting force concentrates on the portion sandwiched between the second slit 15 and the upper side 11a of the claw 11, causing deformation. In order to cause this deformation to occur appropriately, the dimensions of this portion are set in the above-mentioned 1. The slope of the upper side 11a is determined so that it is approximately equal to the small diameter portion sandwiched between the second slits.

In this way, in the first attached state, when twisting is applied to the head of the claw 11, external force concentrates on the thin part between the first slit 12 and the second slit 15, causing this part to deform. However, in the second attachment state, since the side 11b of the claw 11 on the slit side is inside the square hole 30 of the board 6, external torsional force is transmitted to this part. The second part of the head of the claw 11 is inevitable.
External force will be concentrated on the portion sandwiched between the slit 15 and the upper side 11a of the claw 11. As a result, the second slit upper side 15a is deformed so as to press the upper surface of the substrate 6, and the substrate 6 can be fixed.

FIGS. 4(a) and 4(b) show an embodiment in which the present invention is used for attaching a shield case 21. FIG. In this embodiment, the lower end portion 21a of the shield case 21 corresponds to the first support stand 14 in the embodiments of FIGS. 2 and 3. In this way, if the case or chassis itself is used as the first support base 14, the substrates can be tightly coupled.

The example shown in FIG. 5 shows an embodiment in which the shape of the claw 11 is different. In the previous explanation, the shape of the head of the claw 11 was inclined, but the force required to twist and bend the claw in the second attachment state may be greater than that in the first attachment state. As shown in this figure, the upper side 11a of the claw 11 does not have to be inclined.

In the example shown in FIG. 6(a), in order to regulate the position of the substrate 6 in the left-right direction on the paper, the first and second regulating protrusions 22 and 23 are arranged independently of the claws 11 on the ↓ support base 14 and the second It is installed on the support stand 13, and FIGS. 6(b) and (,) show the above-mentioned first and second attached states, respectively.

FIG. 7 is a perspective view showing the substrate 6 and the lower case 1 to which the present invention is applied before they are installed, and the claws 11 are inserted into the square holes 30 or 31 as indicated by arrow C.

[Effects of the Invention] As explained in detail above, according to the present invention, the mounting position of the board can be selected for one type of claw by simply changing the longitudinal dimension of the square hole of the board. can.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Figs. 2 and 3 are views for explaining the first and second installation states thereof, (a) is a front view, and (b) is a sketch. , FIG. 4 shows another embodiment of the present invention, (a) is a sketch thereof, (b) is a front view showing the main parts thereof, and FIG. 5 is a front view showing still another embodiment of the present invention. FIG. 6 shows another embodiment of the present invention, (a) is a front view thereof, (b) and (c) are front views for explaining the first and second mounting states, and FIG. 7 is a front view of the present invention. FIG. 8(a) is a sketch diagram showing the state before mounting the board in each embodiment of the invention
), (b), and (c) are sketches showing a conventional electronic device to which the present invention can be applied, and FIG. 9 is a sectional view showing a conventional board fixing device. 1......Case, 6...Board, 11...Claw, 12......
・First slit, 13... Second slit, 14... First support base, 15...
...Second slit, 30, 31...
Square hole.

Claims (2)

[Claims] (1) a first support stand that supports a substrate; a second support stand above the first support stand having a width narrower than the first support stand and a height lower than the thickness of the substrate; a fixed claw located at the upper part of the second support base and formed narrower than the second support base; and a fixed claw provided on one side of the fixed claw, the height from the second support base to the top of the opening end being the same. A first slit that is lower than the thickness of the substrate, and a second slit that is provided on the other side of the fixed claw and has a height from the second support base to the top of the opening end that is higher than the thickness of the substrate are formed from sheet metal. . A two-stage substrate fixing structure, wherein at least the upper sides of the first and second slits are inclined so that the inner side of the slit is narrower. (2) a first support that supports the substrate; a second support that is located above the first support and has a width narrower than the first support and a height lower than the thickness of the substrate; a fixed claw located at the upper part of the second support base and formed narrower than the second support base; and a fixed claw provided on one side of the fixed claw, the height from the second support base to the top of the opening end being the same. A first slit that is lower than the thickness of the substrate, and a second slit that is provided on the other side of the fixed claw and has a height from the second support base to the top of the opening end that is higher than the thickness of the substrate are formed from sheet metal. , when the substrate is supported on the first support table, the lateral movement of the substrate is restricted by both ends of the second support table, and when the substrate is supported on the second support table, the lateral movement of the substrate is restricted by the second support table. A two-stage substrate fixing structure, characterized in that the lateral movement of the substrate is restricted by the upper end of the opening of one slit and the lower end of the opening of the second slit.