JP2008066150A - Jig set for mounting key dome, and manufacturing method of substrate with key dome - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dust generated from an edge part of a substrate from intruding in the inside of a key dome in mounting the key dome on the substrate by manual operation. <P>SOLUTION: The substrate 10 is arranged on a substrate mounting part 33 of a lower side jig 30 with a surface provided with a plurality of switch contacts 11 turned up, and a key dome sheet 20 with a plurality of the key domes 21 arranged is superimposed thereon. The key dome sheet 20 is arranged so that an adhered surface, and a flange part and an opening part of the key dome 21 turn down, and a top part turns up. The key dome sheet 20 and the substrate 10 are sandwiched so that a hole 47a for positioning of an upper side jig 40 or the like are inserted in a recessed part 37a for positioning of the lower side jig or the like. A load is applied to a direction where the lower side jig 30 and the upper side jig 40 come close with each other, and the adhered surface of the key dome sheet 21 is adhered on a surface provided with the switch contacts 11 of the substrate 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a key dome mounting jig set used in manufacturing a substrate for an electronic device having operation keys, and a method for manufacturing a substrate with a key dome using the jig set.

  For example, a key switch for input operation used in a small electronic device such as a cellular phone includes a key that an operator operates with a finger, a key dome sheet in which metal key domes are arranged in accordance with the arrangement of the keys, and It is comprised from the board | substrate with which the switch contact was arranged on the 1 surface according to the arrangement | sequence of this key (for example, refer FIG. 5 of patent document 1).

  The key dome sheet is affixed to the substrate, and the keys, the key dome, and the switch contacts are assembled in position. The switch contact is provided, for example, so that one pole is circular and the other pole surrounds the donut shape. As a result of attaching and assembling the key dome sheet, the key dome is attached to the substrate with the flange portion connected to the donut-shaped pole of the switch contact.

  When the assembled electronic device is used, when the key is not pressed, the circular pole of the switch contact and the donut-shaped pole are open and non-conductive. When the key is pressed, the apex of the key dome is recessed and contacts the circular pole of the switch contact, and the gap between the switch contact circular pole and the donut-shaped pole passes through the key dome metal. It becomes conductive. When the finger is released from the key, the key dome is restored to its original shape, and the non-conductive state is restored between the circular pole of the switch contact and the donut-shaped pole. By such an operation, an electrical signal corresponding to an operation in which a key is pressed or a finger is released from the key is obtained.

  According to Patent Document 1 described above, a method is known in which a key dome is attached to a sheet one by one to form a key dome sheet, and then the key dome sheet is attached to the surface of a substrate. Such a method is not only complicated in process, but also foreign matter such as hair can enter the space formed between the key dome and the switch contact on the board surface, causing problems during key operation. There is sex. Japanese Patent Application Laid-Open No. H10-228667 describes a technique that eliminates the possibility of the above-described problems by automatically attaching a key dome on a substrate so that a sticking process to a sheet is unnecessary.

  Attach the key dome to the board by manually attaching the key dome sheet with the key dome pre-arranged to match the key arrangement of the electronic equipment to the surface of the board with the switch contact according to the same key arrangement. Methods are also known. This conventional method has the advantage of not requiring a step of attaching the key domes to the sheet one by one, and since there is no need for automatic mounting equipment, the electronic device is manufactured on a relatively small scale. It is suitable.

  An example of the conventional method described above is shown in FIG. In FIG. 4, the substrate 10 is sandwiched by the lower jig 80 and the upper jig 90 together with the key dome sheet 20, and a load is applied in the direction shown in FIG. Affixed to the surface. The lower jig 80 includes a base part 81 and a board attachment part 82, and is formed of a metal material. The base portion 81 is provided with alignment convex portions 83 and 84. Guide pins 85 and 86 are provided on the board mounting portion 82.

  A plurality of key domes 21 are arranged on the key dome sheet 20 in accordance with the key arrangement of the electronic device with the apex portion facing downward in the figure (in FIG. 4, only one of them is given a reference numeral). ing.). The key dome sheet 20 is provided with guide holes 25 and 26 at positions where the key dome sheet 20 is inserted by the guide pins 85 and 86 when placed on the board mounting portion 82.

  In FIG. 4, the key dome sheet 20 has an adhesive surface attached to the substrate 10, a flange portion of the key dome, and an opening surrounded by the key dome sheet 20 facing upward. The substrate 10 has a surface (not shown) on which switch contacts are arranged in accordance with the key arrangement of the electronic device facing downward. The board 10 is provided with guide holes 15 and 16 at positions where the board 10 is inserted by the guide pins 85 and 86 when placed on the board mounting portion 82 so as to overlap the key dome sheet 20.

The upper jig 90 is made of a metal material. When the upper jig 90 and the lower jig 80 are set so as to be loaded with the substrate 10 and the key dome sheet 20 sandwiched therebetween, the upper jig 90 is positioned at a position inserted by the alignment convex portions 83 and 84, respectively. Matching holes 93 and 94 are provided. As described above, it is possible to manufacture a substrate with a key dome by sticking the key dome sheet 20 to the surface of the substrate 10 where the switch contacts are arranged using the lower jig 80 and the upper jig 90. it can.
JP 2003-297182 A (page 2, page 4, FIG. 1)

  Since the technique disclosed in Patent Document 1 above automatically mounts a key dome on a substrate, there is a problem that it is not suitable for relatively small-scale manufacturing that does not require automatic mounting equipment. It was. The method of attaching the key dome sheet to the substrate by the manual operation shown in FIG. 4 does not require an automatic mounting facility and is suitable for relatively small-scale manufacturing. However, in the method shown in FIG. 4, the key dome sheet 20 is located under the substrate 10 and the opening of the key dome faces upward, so that the fineness generated from the edge portion of the substrate 10 (for example, the cut surface of the glass epoxy material). There is a possibility that the dust enters the inside of the key dome 21, which may cause problems such as poor contact.

  The present invention has been made to solve the above problem. When the key dome sheet is manually attached to the substrate and the key dome is attached to the substrate, fine dust generated from the edge portion of the substrate is formed inside the key dome. The purpose is to increase the reliability of the switch connection in the key operation by suppressing the entry.

  In order to achieve the above object, a key dome mounting jig set according to the present invention is a key dome provided with a key dome at a position corresponding to the operation key in the manufacture of a substrate for an electronic device having an operation key. A key dome attachment jig set for attaching the key dome to the substrate by attaching a sheet to the substrate, wherein the substrate can be arranged with the surface to which the key dome sheet is attached facing upward. And a first jig having a first alignment guide and the key dome with the apex of the key dome facing upward and the surface of the key dome sheet attached to the substrate facing downward A second jig having a second alignment guide on which a sheet can be arranged and can be aligned corresponding to the first alignment guide And arranging the substrate on the first jig and the key dome sheet on the second jig, and aligning the positions of the first jig and the second jig, In addition, by applying a load in a direction in which the first jig and the second jig approach each other, the key dome sheet can be attached to the substrate and the key dome can be attached to the substrate. And

  According to the present invention, when the key dome sheet is manually attached to the substrate, the fine dust generated from the edge portion of the substrate is prevented from entering the inside of the key dome and the switch connection reliability in the key operation is improved. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram for explaining a configuration of a key dome mounting jig set according to an embodiment of the present invention and a method for manufacturing a substrate with a key dome. The key dome sheet sticking jig set 1 according to the embodiment of the present invention includes a lower jig 30 and an upper jig 40. In FIG. 1, the substrate 10 is sandwiched by the lower jig 30 and the upper jig 40 together with the key dome sheet 20, and a load is applied in the direction shown in FIG. Affixed to the surface. Since the substrate 10 and the key dome sheet 20 are the same as those described with reference to FIG. 4, they are denoted by the same reference numerals, but the upper and lower directions are opposite to those in FIG. .

  A plurality of key domes 21 are arranged on the key dome sheet 20 in accordance with the key arrangement of the electronic equipment with the apex portion facing upward in the figure (in FIG. 1, only one of them is given a reference numeral). ing.). The key dome sheet 20 is provided with guide holes 25 and 26. In FIG. 1, the key dome sheet 20 has a bonding surface attached to the substrate 10, a flange portion of the key dome, and an opening portion surrounded by the flange portion.

  A plurality of switch contacts 11 are arranged on the upward surface of the substrate 10 shown in FIG. 1 according to the key arrangement of the electronic device (in FIG. 1, only one of them is given a reference numeral). .) The substrate 10 is provided with guide holes 15 and 16.

  The configuration of the switch contact 11 and the operation of the key dome 21 will be described with reference to FIG. FIG. 2A shows that the key dome 21 is attached to the switch contact 11 by sticking a key dome sheet 20 (not shown here) to one surface of the substrate 10 (not shown here). It is a perspective view explaining the state attached. The key dome 21 is made of metal and has a hollow dome shape, and has a vertex portion 22 and a flange portion 23. A circular range surrounded by the flange portion 23 is an opening of the key dome 21.

  The switch contact 11 includes a circular pole 12 and a donut-shaped pole 13 surrounding the circular pole 12. When the key dome 21 is attached from above as indicated by an arrow in the figure, the flange portion 23 is connected to the doughnut-shaped pole 13. Usually, the circular pole 12 and the donut-shaped pole 13 are open and non-conductive.

  FIG. 2B illustrates the operation of the key dome 21 and is a cross-sectional view illustrating a state after the key dome 21 is attached to the switch contact 11 in FIG. When the switch contact 11 and the key dome 21 are assembled with the position of a key of an electronic device (not shown) and then the key is pressed with a finger as indicated by a block arrow in the figure, the apex 22 of the key dome 21 is depressed. In contact with the circular pole 12. As a result, the circular pole 12 and the donut-shaped pole 13 are electrically connected via the metal of the key dome 21. When the finger is released from the key, the key dome 21 is restored to the original hollow dome shape, and the circular pole 12 and the doughnut-shaped pole 13 return to a non-conductive state. By such an operation, an electrical signal corresponding to an operation of pressing a key or releasing a finger from the key is transmitted from the switch contact 11 to a circuit mounted on the substrate 10.

  As shown in FIG. 2A, the key dome 21 is attached to the switch contact 11 from above the substrate 10 with the apex portion 22 facing up and the flange portion 23 and the opening portion facing down. There is very little risk that fine dust generated from the edge of the inside of the key dome 21 will enter the inside of the key dome 21.

  The configuration of the lower jig 30 and the upper jig 40 will be described with reference to FIGS. The lower jig 30 is formed of a metal material with the base portion 31 as a base. A substrate mounting portion 33 separated by a peripheral wall portion 32 is provided at a substantially central position of the base portion 31. Finger contact portions 34 a and 34 b are provided at two locations along the peripheral wall portion 33 by, for example, partially cutting the base portion 31 downward. Positioning convex portions 37a, 37b, and 37c are provided outside the peripheral wall portion 32 on the base portion 31. On the outside of the peripheral wall portion 32 on the base portion 31, springs 38a and 38b are provided.

  The upper jig 40 is made of a metal material. In FIG. 1, handles 41 a and 41 b are provided on the side edges of the upper jig 40 that are on the left and right sides, respectively. In FIG. 1, recessed portions corresponding to the finger contact portions 34 a and 34 b are respectively formed on the end sides corresponding to the near side and the far side of the upper jig 40. When the upper jig 40 and the lower jig 30 are sandwiched between the substrate 10 and the key dome sheet 20 and set so that a load is applied, the upper jig 40 is inserted into the positions inserted by the alignment convex portions 37a, 37b and 37c. Alignment holes 47a, 47b and 47c are provided, respectively.

  FIG. 3 is a view showing the substrate 10, the key dome sheet 20, and the upper jig 40 shown in FIG. 1 as viewed from an obliquely lower side while maintaining the positional relationship (the illustration of the lower jig 30 is shown). (Omitted). In FIG. 3, the substrate 10 and the guide holes 15 and 16, the key dome sheet 20 and the key dome 21, and the guide holes 25 and 26 are as described with reference to FIG. 1. In FIG. 3, the upper jig 40, the handles 41a and 41b, and the alignment holes 47a, 47b and 47c are as described with reference to FIG.

  Guide pins 45 and 46 are provided on the downward surface of the upper jig 40 shown in FIG. When the guide pin 45 is set so that a load is applied with the substrate 10 and the key dome sheet 20 sandwiched between the lower jig 30 and the upper jig 40, the guide hole 25 of the key dome sheet 20 and the guide of the substrate 10 are set. It is provided at a position where the hole 15 is inserted. When the guide pins 46 are set so as to press the substrate 10 and the key dome sheet 20 between the lower jig 30 and the upper jig 40, the guide holes 46 of the key dome sheet 20 and the guide holes 16 of the substrate 10 are set. It is provided so that it may be inserted.

  A plurality of magnetic bodies 48 are attached to the downward surface of the upper jig 40 shown in FIG. 3 (only one of them is given a reference numeral in FIG. 3). The magnetic body 48 is formed on the key dome sheet 20 when the guide pins 45 and 46 of the upper jig 40 are inserted into the guide holes 25 and 26 of the key dome sheet 20 and the key dome sheet 20 is disposed in the upper jig 40, respectively. It is attached at a position corresponding to a part or all of the plurality of arranged key domes 21.

  With reference to FIG.1 and FIG.3, the manufacturing method of the board | substrate with a key dome using the jig | tool set 1 for key dome attachment is demonstrated. First, the substrate 10 is arranged on the substrate attachment portion 33 with the surface on which the switch contacts 11 are arranged facing upward. The key dome sheet 20 has the bonding surface and the flange portion 23 of the key dome 21 facing downward, the apex portion 22 of the key dome 21 facing upward, and the guide holes 25 and 26 being guide pins 45 of the upper jig 40, respectively. And 46 are arranged on the downward surface of the upper jig 40. At this time, part or all of the plurality of key domes 21 arranged on the key dome sheet 20 are attracted by the magnetic force of the plurality of magnetic bodies 48 attached to the downward surface of the upper jig 40. The fall of the dome sheet 20 can be prevented.

  The upper jig 40 having the key dome sheet 20 on the downward surface has the handles 41a and 41b with the left hand and the right hand, respectively, and the alignment protrusions 37a, 37b and 37c of the lower jig 30 are respectively the upper jig. The positioning holes 47a, 47b and 47c are set so as to be inserted therethrough. Then, the guide pins 45 and 46 of the upper jig 40 pass through the guide holes 15 and 16 of the substrate 10 respectively, and the flange portions 23 of the plurality of key domes 21 arranged on the key dome sheet 20 respectively correspond to the substrate 10. Take a position corresponding to the donut-shaped poles 13 of the switch contacts 11 arranged on the upward surface.

  In this state, as shown in FIG. 1, by applying a load in such a direction that the lower jig 30 and the upper jig 40 approach each other, the bonding surface of the key dome sheet 20 is directed upward in FIG. 1. The flange portion 23 of the key dome 21 is attached to the donut-shaped poles 13 of the individual switch contacts 11 of the substrate 10. In the above process, since the key dome 21 is always located above the substrate 10 and the apex portion 22 of the dome is directed upward and the flange portion 23 and the opening portion are directed downward, fine dust generated from the substrate 10 is The possibility of entering the hollow interior of the dome 21 is very small.

  When a load is applied and the load is removed after the flange portion 23 of the key dome 21 is attached to the donut-shaped poles 13 of the individual switch contacts 11 of the substrate 10 as shown in FIG. 1, the elasticity of the springs 38a and 38b. The force acts in a direction to move the upper jig 40 away from the lower jig 30. At this time, if the finger rests 34a and 34b of the lower jig 30 are used, the indented portion of the edge of the upper jig 40 that contacts the near side and the far side in FIG. The upper jig 40 can be easily removed.

  The spring 38a or 38b may be another type of elastic body as long as the elastic force similar to the above acts, and when the operability in removing the upper jig 40 is not important You can lack it. Similarly, it is lacking the recessed part of the edge of the upper jig | tool 40 which hits the handle 41a, the same 41b, the finger contact part 34a, the same 34b of the lower jig | tool 30 mentioned above, or the near side and back side of FIG. It doesn't matter.

  The magnetic body 48 may be attached so as to be exposed on the downward surface of the upper jig 40 in FIG. 3 or may be embedded without being exposed. If the key dome sheet 20 can be prevented from dropping simply by inserting the guide pins 45 and 46 into the guide holes 25 and 26 of the key dome sheet 20, the magnetic body 48 may be omitted.

  The alignment hole 47a, 47b or 47c may be a recessed portion instead of a penetrating hole. The lower jig 30 may be provided with an alignment hole or a concave portion, and the upper jig 40 may be provided with an alignment convex portion. The lower jig 30 may be provided with an alignment convex portion together with the alignment hole or concave portion, and the upper jig 40 may be provided with an alignment convex portion and an alignment hole or concave portion corresponding thereto.

  According to the embodiment of the present invention, when the key dome is manually attached to the substrate, by attaching the key dome from above the substrate with the apex of the key dome facing upward, it is possible to suppress fine dust from entering the inside of the key dome. Thus, the reliability of switch connection in the key operation of the electronic device can be improved. In addition, the shape of the jig | tool set demonstrated in the above Example, the shape of each part which corresponds to the subordinate structure, arrangement | positioning, a processing method, etc. are illustrations, and various deformation | transformation are possible in the range which does not deviate from the summary of this invention.

The figure explaining the structure of the jig | tool set for key dome attachment which concerns on the Example of this invention, and the manufacturing method of a board | substrate with a key dome. (A) is a figure explaining the state in which the key dome in the Example of this invention is attached to a switch contact, (b) is a figure explaining the effect | action of a key dome similarly. In the Example of this invention, the figure which looks up and shows a part of them represented from FIG. 1 from diagonally downward. The figure explaining the structure of the jig set for the conventional key dome attachment, and the manufacturing method of a board | substrate with a key dome.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Key dome attachment jig set 10 Board | substrate 11 Switch contact 15, 16, 25, 26 Guide hole 20 Key dome sheet | seat 21 Key dome 22 Apex part 23 Flange part 30 Lower jig | tool 31 Base part 32 Perimeter wall part 33 Board attachment Portions 34a, 34b Finger contact portions 37a, 37b, 37c Positioning convex portions 38a, 38b Spring 40 Upper jigs 41a, 41b Handle 45, 46 Guide pins 47a, 47b, 47c Positioning hole 48 Magnetic body

Claims (5)

In manufacturing a substrate for an electronic device having an operation key, a key dome is attached to the substrate by attaching a key dome sheet having a key dome provided at a position corresponding to the operation key to the substrate. A jig set,
A first jig capable of arranging the substrate with the surface to which the key dome sheet is attached facing upward, and having a first alignment guide;
The key dome sheet can be arranged with the apex portion of the key dome facing up and the surface of the key dome sheet attached to the substrate facing down, and the first dome guide A second jig having a second alignment guide capable of corresponding alignment,
The substrate is placed on the first jig, the key dome sheet is placed on the second jig, and the positions of the first jig and the second jig are aligned with each other, and A key characterized in that the key dome can be attached to the substrate by attaching the key dome sheet to the substrate by applying a load in a direction in which the first jig and the second jig approach each other. Dome mounting jig set.   The said 2nd jig | tool has a magnetic body, When the said key dome sheet | seat is arrange | positioned, it was comprised so that the fall of the said key dome sheet | seat might be prevented with the magnetic force of the said magnetic body. The jig set for attaching a key dome according to 1.   The first jig or the second jig further includes an elastic body, and the elastic body applies an elastic force in a direction in which the first jig and the second jig move away from each other. The key dome mounting jig set according to claim 1, wherein the key dome mounting jig set is provided.   2. The key dome mounting jig set according to claim 1, wherein one of the first alignment guide and the second alignment guide is a convex portion, and the other is a hole or a concave portion. . In a method for manufacturing a substrate with a key dome by attaching to the substrate a key dome sheet provided with a key dome at a position corresponding to the operation key, the substrate for an electronic device having an operation key,
Placing the substrate on the first jig with the surface to which the key dome sheet is attached facing upward;
Placing the key dome sheet on the second jig with the apex of the key dome facing up and the surface of the key dome sheet affixed to the substrate facing down;
Align the positions of the first jig and the second jig,
The key dome is attached to the substrate by attaching the key dome sheet to the substrate by applying a load in a direction in which the first jig and the second jig approach each other. A method for manufacturing a substrate with a substrate.

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