JPH0849710A - Part fixing structure for molded panel and keyboard for inputting information - Google Patents

Abstract

PURPOSE:To firmly fix a fixing part which is fixed in an inclined state to a face via columnar projections stood on a part fixing face so as to improve productivity. CONSTITUTION:In part fixing structure for a mold panel that fixes a fixing part in an inclined state to a part fixing face via a plurality of columnar projections which is stood on the part fixing face of the molded panel, a tongue piece 41e formed from a U-shaped slit 41d which curves halfway around the columnar projection root region or the vicinity of the fixing position and extends to the other columnar projections 41b-2, 41b-1 or the fixing position direction, in the vicinity of a pair of columnar projections 41b-1, 41b-2 positioned apart in the inclined direction of the molded panel 41 and the fixing part 42 or the one side of the fixing part fixing position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component fixing structure in a resin molded product having a thickness smaller than a flat area such as a keyboard housing for information input, and more particularly to a columnar protrusion standing on a component fixing surface. The present invention relates to a mold panel component fixing structure for improving productivity by securely fixing a fixing component that is fixed in an inclined state with respect to the surface.

In general, a plurality of columnar protrusions (hereinafter referred to as bosses) for fixing components, which are provided in a resin molded product such as the above-mentioned keyboard housing, are molded in order to simplify the mold structure and increase productivity. Since it is often made to project in the drawing direction of the metal mold, that is, the cavity, they are formed in parallel as a result.

In many cases, a resin molded product whose overall shape is curved in the thickness direction is formed into a flat shape and then curved by a required amount in order to simplify the mold construction and improve productivity.

Therefore, a mold panel having a plurality of bosses for fixing the parts and having an overall shape curved in the thickness direction often adopts a method of once molding the panel into a flat shape and then bending the entire panel. , In this case, the parallelism between the bosses will be broken due to the bending of the panel, and if a fixed component such as a circuit board is fixed via the boss, its positioning and fixing become unstable and secure. Since it becomes difficult to obtain the fixation, the solution is desired.

[0005]

2. Description of the Related Art In the following description, a case where a molded panel is a housing of the above information input keyboard (hereinafter simply referred to as a keyboard) will be described as an example.

FIG. 5 for explaining the technical background is a diagram showing a conventional structure for fixing parts of a molded panel by taking a keyboard as an example. (5-1) shows an appearance in a plan view and (5-2) shows an arrow a.
It is sectional drawing which expanded the main part which concerns on this invention when it cut | disconnects by a '.

FIG. 6 is a diagram for explaining a problem in the conventional component fixing structure. FIG. 5 for explaining the general structure of the keyboard together with the component fixing structure according to the present invention. In FIG. 5, a keyboard 1 completed by mounting a plurality of types of key tops 11.
Is a fixed interval w with respect to the back surface 12a by fixing the molded panel 12 as a keyboard housing and a plurality of projections 12b protruding on the back surface (lower surface in the figure) 12a with screws 13 or the like.
A support panel 14 made of metal, which is arranged so as to maintain the pressure-switching sheet attached to the corresponding position on the upper surface of the panel 14 in a state in which each switching region is arranged and formed so as to correspond to each key-top arrangement position. (Hereinafter referred to as a membrane sheet) 15, a plurality of bosses 12c projecting through the support panel 14 with the membrane sheet 15 attached to the blank area of the back surface 12a of the mold panel.
It is sandwiched between the back surface 12a and the membrane sheet 15 at a position corresponding to the above-mentioned key top arrangement position on the back surface side of the circuit board 17 and the back surface side of the molded panel fixed by screws 16 or the like. The dome-shaped rubber actuators 18, which are positioned and arranged in this state, are configured as main constituent members.

A cylindrical projection 12 is formed on the upper surface of each of the key tops of the molded panel 12 so as to project therefrom.
In d, the shaft 1 that projects the key top 11 described above
When mounted by inserting 1a, the lower end surface of the shaft 11a comes into contact with the apex region of the rubber actuator 18.

The circuit board 17 connected to the membrane sheet 15 in a region not shown is the membrane sheet 15
Is for converting the signal in 1 to the output signal of the keyboard 1.

Then, for example, the key top 11 is manually operated.
When is pressed, the corresponding switching area of the membrane sheet 15 becomes conductive due to the pressing deformation of the rubber actuator 18 caused by the shaft 11a.
Can be output.

When the depression is released, the elasticity of the rubber actuator 18 itself raises the key top 11 and the conduction in the switching area is lost, and the signal output as the keyboard 1 is stopped.

Therefore, it is possible to construct a keyboard capable of outputting and stopping signals by pressing the key top 11 or releasing the pressing. In the molded panel 12 of such a keyboard, since the circuit board as a fixed component is abutted and fixed to the tip surface 12c 'of the boss 12c protruding in parallel from the back surface side, positioning and mounting and fixing of the circuit board are easy. And sure.

On the other hand, in the recent field of keyboards, in order to meet demands for improvement of operability and miniaturization as a keyboard, for example, a curved surface such as a part of a cylinder is formed so that the key top placement surface becomes higher from the front side to the front side. A technique for forming a curved line (a curved line and a curved surface in the following text all refer to this curved line and curved surface) has been put into practical use.

In this case, in order to mold the molded panel constituting the keyboard as a curved surface from the time of molding, as described above, a lot of man-hours are required for manufacturing the molding die and thus the cavity, which is expensive. There are disadvantages such as.

Therefore, a method may be adopted in which a desired molded panel is obtained by molding a flat molded panel before bending and then bending it in the thickness direction. FIG. 6 illustrates the case of bending a flat mold panel by taking the main part of the keyboard as an example. (6-1) shows a state before assembly and (6-2) shows a state after assembly. is there.

In the drawing, the case of bending the molded panel of the keyboard described in FIG. 5 is taken as an example.
The same symbols are given to the same target parts and parts as in FIG. 5, and duplicate explanations are omitted.

In (6-1) of the figure, the keyboard 2 is fixed by the mold panel 12 described in FIG. 5 and a plurality of protrusions 12b protruding on the rear surface 12a thereof so that a constant space b is formed with respect to the rear surface 12a. A support panel 21, which is made of metal and is kept in place,
The membrane sheet 15 attached thereto, and the circuit board 17 and the rubber actuator 18 described in FIG. 5 are configured as main constituent members.

And in particular in this case the support panel 21
Shows a support panel 14 in FIG. 5 which is curved with a required radius of curvature. Therefore, if the support panel 21 is fixed to the protrusion 12b of the mold panel 12 on which the rubber actuator 18 is mounted with the screw 13 or the like, the mold panel 12 can be curved corresponding to the degree of curvature of the support panel 21. .

In this case, when the groove 12e as shown in the drawing is formed orthogonal to the bending direction near each key top arrangement position on the upper surface of the mold panel 12, the bending as the mold panel 12 can be facilitated.

Next, the circuit board 17 is fixed to the boss 12c of the mold panel 12 with screws 16 or the like, and the key top 11 described with reference to FIG. Curved keyboard 2
Can be configured as in (6-2).

Therefore, it is possible to construct a keyboard which can meet customer demands such as improved operability and miniaturization without using a molding die which requires a lot of manufacturing steps.

[0022]

However, in the keyboard having such a structure, the molded panel which is flat at the time of molding is used.
Since 12 is curved by mounting and fixing the support panel 21, the bosses 12c, which were initially parallel, are opened so that the parallelism is lost.

Therefore, as a result, when the circuit board 17 is mounted, the screw 16 is attached to the boss 12c as shown in (6-2) of FIG.
Eccentricity or the tip surface 12c 'of the boss 12c contacts the circuit board 17 by one side, resulting in difficulty in mounting and positioning of the circuit board 17 and unstable mounting and fixing thereof. There was a problem that it became easy to become.

[0024]

[Means for Solving the Problems] The above-mentioned problem is a component fixing structure for a mold panel, in which a fixing component is fixed to a component fixing surface of a mold panel through a plurality of columnar projections that are inclined with respect to the surface. In the vicinity of one side of the columnar projection or the fixing part fixing position that is paired apart from each other in the tilt direction of the mold panel and the fixing part, after half-circling the columnar projection root region or the fixing position vicinity. This is solved by the component fixing structure of the mold panel in which the tongue piece made of the other columnar protrusion or the U-shaped slit extending in the fixing position direction is formed.

[0025]

When the mold panel is formed so that the boss for fixing the component can be tilted according to the inclination of the fixed component, the component contact surface of the boss can be brought into surface contact with the component surface, so that the component can be positioned with respect to the mold panel. It is possible to realize easy and reliable mounting and fixing.

Therefore, in the present invention, a mold panel is formed in the root region of the boss by surrounding the boss in a semi-circular shape and providing a slit having a "U" shape in plan view extending in the curving direction.

This means that the boss is located on the tongue formed by the slit, so that the boss can be tilted with the elastic displacement of the tongue. The displacement as a tongue in this case is induced by an external force applied to the component contact surface of the boss.

Therefore, the non-parallelization between the bosses caused when the flat molded panel is curved can be corrected by the contact of the fixed part with the boss part contact surface.
It can be expected that productivity will be improved by facilitating and assuring positioning, mounting, and fixing of the fixed component with respect to the boss and thus the mold panel.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view for explaining the principle of the component fixing structure according to the present invention, in which (1-1) shows the state before fixing the component.
-2) is a diagram showing the state after the parts are fixed.

FIG. 2 is a diagram for explaining an example of a component fixing structure according to the present invention, FIG. 3 is a diagram showing an example of applying the component fixing structure of the present invention to a keyboard, and FIG. 4 is another component of the present invention. It is a figure showing an example of a fixed structure.

Since FIG. 3 exemplifies the case of applying to the same keyboard as FIGS. 5 and 6, the same target members and parts as those in FIGS. 5 and 6 are represented by the same symbols and are duplicated. The explanation is omitted.

In (1-1) of FIG. 1 exemplifying the case where the fixed part is attached to the mold panel via the boss, the boss 31a of the mold panel 31 has a "U" -shaped slit 31b which makes a half turn around the root region. Tongue 31c formed by
Is formed in the free end side tip region.

A fixed part 32 such as a circuit board is inclined with respect to the mold panel 31 at an angle α, for example, and is fixed to the panel 31 while maintaining the angle α.

In this case, when the part 32 is lowered in parallel as shown by an arrow A and brought into contact with the boss 31a, the tip surface 31a 'of the boss 31a and the lower surface 32a of the part 32 are unilaterally contacted at the moment of contact. Although the tongue piece 31c where the boss 31a is located starts to bend from the base 31c 'as a starting point at that time, by appropriately setting the descending amount of the component 32, (1-2)
As shown in, the tip end surface 31a 'of the boss 31a and the lower surface 32a of the component 32 can be brought into surface contact with each other.

Therefore, by fixing the component 32 and the mold panel 31 using, for example, screws 33, the component 32 can be fixed to the mold panel 31 in a stable state. In Fig. 2 showing the case where the mold panel is located above the fixed parts, (2-1) shows the state before fixing the parts (2-2)
[Fig. 3] is a diagram showing a state after the components are fixed.

In (2-1) of the figure, the lower surface 41 of the mold panel 41 is
two bosses 41b _-1 in a, 41b _-2 are formed to protrude from said surface in a state with an internal thread 41c, respectively, (the boss in the case of FIG located on the right side) further on one side of the boss 41b _{- 1} is a tongue piece 41 formed by a "U" -shaped slit 41d extending to the boss 41b _-2 side on one side after half-circulating the root region
It is formed at the free end side of e.

The fixed part 42 fixed to the mold panel 41 includes the bosses 41b- ₁ and 41b of the mold panel 41.
_-2 at each position corresponding to _-2
2a _-1 , 42a _-2 are formed.

Therefore, the mold panel 41 is bent to
Without fixing, that is, in the state shown in the figure, the fixing part 42 is fixed.
To raise the part 42,
a_-1, 42a _-2And each boss 41b_-1, 41b_-2Mates with female screw 41c
Securely realized by tightening the screw 43 in the tight state.
Can be

On the other hand, when the mold panel 41 is bent as described with reference to FIG. 6, the area of each tongue piece 41e of the panel 41 is (2) due to the slit 41d forming it.
-Maintain the initial flat state as shown in (2).

Therefore, similarly to (2-1), the holes 42a _-1 , 42a _-2 and the female screws 41c of the bosses 41b _-1 , 41b _-2 by raising the component 42 are formed.
Both can be fixed easily and surely by tightening with the screw 43 in conformity with.

Even when the panel 41 is curved to the opposite side as shown by the broken line B in the figure, the tongues 41e maintain the initial flat state, so that the fixing part 41 can be securely fixed to the panel 41. it can.

In FIG. 3 showing an example of application to a keyboard, (3
-1) shows the same plan view appearance as in (5-1) of FIG. 5, and (3-2) is a cross-sectional view enlarging the main part when the (3-1) is cut along arrows b to b '. Is.

The keyboard 5 completed by mounting a plurality of types of key tops 11 in FIG. 3 includes a molded panel 51 that serves as a keyboard housing and a plurality of projections 12b protruding from the back surface (lower surface in the figure) 12a thereof. A curved support panel 21 made of metal disposed on the back surface side by fixing with 13 or the like, and a membrane sheet 1 attached to a corresponding position on the upper surface of the panel 21.
5, a circuit board 17 arranged on the back surface side by fixing with screws 16 to a plurality of bosses 41c provided in the blank area of the back surface 12a of the mold panel, and a dome-shaped rubber actuator 1
8 and are the main components.

Especially, in this case, the mold panel
The key 51 is the key top of the mold panel 12 described in FIG.
An example of a blank area that avoids the position of the cylindrical projection 12d for mounting.
For example, the bosses 41b explained in FIG._-1~ Four
1b_-FourIs formed so as to project to the back side, and the support pad
41b paired in the curved direction of flannel 21_-1And 41b_-2And 41b _-3
And 41b_-FourThe boss 41b in Figure 2_-1, 41b_-2As well as
The boss 41b_-1The other boss 41b after half a turn around the root area
_-2Formed by a "U" shaped slit 41d that extends to the side
The tongue piece 41e is formed so that it is located in the free end side tip region.
Have been.

An area indicated by a broken line C surrounding each of the bosses 41b- ₁ to 41b- ₄ represents an arrangement area of fixed parts. Therefore, when the support panel 21 is fixed to the mold panel 51 on which the rubber actuator 18 is mounted with the screw 13 or the like,
As described with reference to FIG. 6, the mold panel 51 can be curved according to the degree of curvature of the support panel 21.

In this case, each tongue piece 41 of the mold panel 51 is
e holds the initial flat state as described in FIG.
Therefore, as in the case of FIG. 2, reliable fixing of the fixing component 17 to the mold panel 51 can be realized.

The slit 41d is formed in a "U" shape that extends halfway around the root region of the boss 41b _-2 and extends to the other boss 41b _-1 side, and the boss 41b _-2 is the free end side tip of the tongue piece 41e. The same effect can be obtained even if it is located in the area.

FIG. 4 shows a case where the component fixing structure according to the present invention is applied to a keyboard housing. (4-1) is a side sectional view for explaining a state at the time of assembly, and (4-2) FIG. 4 is a diagram showing the main part of the housing before assembly as seen from arrows c to c'of (4-1).

A keyboard housing 6 made of a resin molded product in the figure.
Is composed of a bottom plate 61 having a peripheral wall 61a and a lid plate 62 having a peripheral wall 62a tapered from a peripheral opening fitted to the peripheral wall 61a.

The bottom plate 61 and the lid plate 62 are provided at a position corresponding to the boss 62b provided on the inner surface of the lid plate so as to project so as to be parallel to the peripheral wall 62a, and the boss 62b of the bottom plate 61. The tongue piece 61c formed by the U-shaped slit 61b provided is fixed by screwing the tongue piece 61c.

The tip surface 62b 'of the boss 62b provided on the cover plate 62 and the free end side tip region of the tongue piece 61c provided on the bottom plate 61 are the base 61c' of the tongue piece 61c. It is capable of surface contact when it is flexed.

Therefore, the peripheral wall 61a of the bottom plate 61 is attached to the peripheral wall 62 of the lid plate 62.
After fitting and mounting a, the tongue piece 61c of the bottom plate 61 is displaced toward the lid plate side as shown by the broken line D in (4-1), and the free end side tip region of the tongue piece 61c is bossed on the lid plate 62. Both can be fixed by tightening with a screw 63 or the like in a state of being in surface contact with 62b.

In such a component fixing structure, variations in the length L of the boss 62b provided on the lid plate 62 can be absorbed by the amount of bending of the tongue piece 61c of the bottom plate 61, so that it is not necessary to form the length L strictly. There are merits.

[0054]

As described above, according to the present invention, it is possible to improve productivity by securely fixing the fixed component which is fixed in the state of being inclined with respect to the component fixing surface through the columnar projections standing on the component fixing surface. It is possible to provide the component fixing structure of the molded panel as intended.

[Brief description of drawings]

FIG. 1 is a view for explaining in principle a component fixing structure according to the present invention.

FIG. 2 is a diagram illustrating an example of a component fixing structure according to the present invention.

FIG. 3 is a diagram showing an example of application of the component fixing structure of the present invention to a keyboard.

FIG. 4 is a diagram showing an example of another component fixing structure of the present invention.

FIG. 5 is a diagram explaining a technical background.

FIG. 6 is a diagram illustrating a problem in a conventional component fixing structure.

[Explanation of symbols]

5 Information input keyboard 6 Keyboard housing 11 Key top 12d Cylindrical protrusion 15 Membrane sheet 16,33,43 Screw 17 Circuit board (fixed part) 18 Rubber actuator 21 Support panel 31,41,51 Mold panel 31a, 41b, 41b _-1 , 41b _-2 , 41b _-3 , 41b _-4 , 62b Columnar protrusion (boss) 31a ', 62b' Tip surface 31b, 41d, 61b
Slits 31c, 41e, 61c Tongues 31c ′, 61c ′
Base 32,42 Fixed part 41a Lower surface 41c Female screw 61 Bottom plate 61a, 62a Peripheral wall 62 Lid plate

Claims (2)

[Claims] 1. A component fixing structure of a mold panel, wherein a fixing component is fixed to a component fixing surface of a mold panel through a plurality of columnar projections that are inclined with respect to the component fixing surface. In the vicinity of one side of the columnar projection or the fixed part fixing position that is positioned apart in the inclination direction of the part, near the one side of the fixing position of the fixing part A component fixing structure for a molded panel, characterized in that a tongue piece made of a U-shaped slit extending in a vertical direction is formed. 2. A keyboard for inputting information, wherein a concave side of a curved mold panel is used as a mounting surface of a keytop, and end faces of a plurality of columnar projections formed to project to the back side of the mold panel are fixed surfaces of fixing parts. The columnar projections that are located apart from each other in the bending direction of the mold panel and the fixed part and make a pair, or near one side of the fixed part fixing position, and after the semicircle around the columnar projection root region or the fixing position, the other A keyboard for information input, characterized in that a tongue made of a columnar protrusion or a U-shaped slit extending in the fixed position direction is formed.