JP5719708B2 - switch - Google Patents

Description

  The present invention relates to a switch used as an operation switch for various electronic devices, and in particular, a movable contact made of a dome-shaped metal thin plate having a spring property that can be deformed by pressing is mounted on one surface of the insulating substrate. The present invention relates to a switch for short-circuiting the pattern formed on the movable contact.

  First, a conventional switch using a movable contact made of a circular dome-shaped metal thin plate having a spring property that can be deformed by pressing will be described with reference to FIGS. 3 (A) and 3 (B). 3A is a top view of the switch, and FIG. 3B is a cross-sectional view of the switch.

  As shown in both figures, the conventional switch has a circular central fixed contact pattern 22 which is an inner circular contact constituting two concentric inner and outer circular contacts made of a conductive material, and an insulating gap between the central fixed contact pattern 22 and the central fixed contact pattern 22. A circular annular peripheral fixed contact pattern 23 that is an outer circular contact surrounding the intermediate fixed contact pattern 23 is formed on the upper surface of the insulating substrate 21, and a part of the outer peripheral portion of the central fixed contact pattern 22 is centered on the upper surface of the insulating substrate 21. A single straight line passing through the center of the fixed contact pattern 22 (in the radial direction of the central fixed contact pattern 22) is drawn to the outer peripheral side of the peripheral fixed contact pattern 23, and the drawn portion 24 is further extended and routed in any direction. Thus, a wiring pattern of the central fixed contact pattern 22 is formed, and a part of the outer peripheral portion of the peripheral fixed contact pattern 23 is connected to the lead portion 24 of the central fixed contact pattern 22. The lead wire 25 is drawn to the outer peripheral side of the peripheral fixed contact pattern 23 so as not to be electrically connected due to the difference, and the lead portion 25 is further extended and routed in an arbitrary direction to be a wiring pattern of the peripheral fixed contact pattern 23. Yes.

  Here, the lead-out portion 24 of the central fixed contact pattern 22 is drawn out from the central fixed contact pattern 22 surrounded by the peripheral fixed contact pattern 23 to the outer peripheral side of the peripheral fixed contact pattern 23, so that the peripheral fixed contact pattern 23 is completely If it is formed in a closed annular shape, the lead portion 24 of the central fixed contact pattern 22 intersects with a part of the peripheral fixed contact pattern 23 and is electrically connected. Therefore, a gap 23a is provided in a part of the peripheral fixed contact pattern 23, and the peripheral fixed contact pattern 23 is partially opened in an annular shape (C-shape), and the lead-out portion 24 of the central fixed contact pattern 22 passes through the gap 23a. Electrical insulation is ensured between the peripheral fixed contact pattern 23 and the peripheral fixed contact pattern 23.

  An insulating film (cover lay) 26 is fixed to the upper surface of the insulating substrate 21 with an adhesive, and a central fixed contact pattern 22 and a peripheral fixed contact pattern are formed from a circular hole 26a provided in the insulating film 26. 23 is exposed, and a wiring pattern that is an extension of the lead portion 24 of the central fixed contact pattern 22 and a wiring pattern that is an extension of the lead portion 25 of the peripheral fixed contact pattern 23 are covered and protected by the insulating film 26. Yes.

  Further, in the hole 26a of the insulating film 26, a movable contact 27 made of a circular dome-shaped metal thin plate having a spring property that can be deformed by pressing straddles the center fixed contact pattern 22 and the lower peripheral edge thereof is a peripheral fixed contact pattern. The movable contact 27 is stuck and held on the insulating substrate 21 by the adhesive sheet 28. At this time, the movable contact 27 is in a state in which the peripheral edge at the lower end is in contact with the peripheral fixed contact pattern 23, and the central portion is in a state of being opposed to the central fixed contact pattern 22. When viewed from above, the lead-out portion 24 of the central fixed contact pattern 22 is also connected to the movable contact 27 on a single straight line passing through the center of the movable contact 27 (in the radial direction of the movable contact 27). 23 is pulled out to the outer peripheral side.

  Here, when the movable contact 27 is mounted, the lead-out portion 24 of the central fixed contact pattern 22 abuts on the lower peripheral edge of the movable contact 27 when the movable contact 27 is mounted only by pulling it out to the outer peripheral side of the peripheral fixed contact pattern 23 through the gap 23a. 27 is in an electrically conductive connection state. Therefore, the insulating film 26 is provided with a protruding portion 29 that protrudes into the hole 26 a, and the lead portion 24 of the center fixed contact pattern 22 is covered with the protruding portion 29, and the protruding portion is provided between the lower end peripheral portion of the movable contact 27. By interposing 29, electrical insulation with the movable contact 27 is ensured.

  The operation of the conventional switch is as shown in FIG. 3B when a key top is placed on the adhesive sheet 28 reflecting the dome shape of the movable contact 27 and the center of the adhesive sheet 28 is pressed through the key top. As shown by the phantom line, the central portion of the movable contact 27 is inverted in a downwardly convex manner to cause a click feeling, the central portion of the movable contact 27 abuts the central fixed contact pattern 22, and the central fixed contact pattern The central portion of the movable contact 27 is inverted in a downward convex shape when the pressing is released, and the switch 22 is electrically connected to the peripheral fixed contact pattern 23 via the movable contact 27. Automatically returns to the original upward convex shape due to its springiness, and the central portion of the movable contact 27 is separated from the central fixed contact pattern 22 and is switched off.

  In the conventional switch assembly, the insulating film 26 is superposed on the upper surface of the insulating substrate 21 to heat and press the insulating film 26, and the insulating film 26 is bonded to the insulating substrate 21 with an adhesive provided on the lower surface of the insulating film 26. After that, the adhesive sheet 28 to which the movable contact 27 is previously attached is bonded to the insulating film 26, thereby completing the movable contact 27 by placing it on the peripheral fixed contact pattern 23 in the hole 26a and holding it. To do.

  Next, another conventional switch using a movable contact made of an oval dome-shaped metal thin plate having a spring property that can be deformed by pressing will be described with reference to FIGS. 4 (A) and 4 (B). 4A is a top view of the switch, and FIG. 4B is a cross-sectional view of the switch.

  As shown in both figures, another conventional switch includes a circular central fixed contact pattern 32 which is an inner contact constituting two concentric inner and outer contacts made of a conductive material, and an insulating gap between the central fixed contact pattern 32 and the central fixed contact pattern 32. An oval peripheral fixed contact pattern 33 that is an outer contact that surrounds the insulating substrate 31 is formed on the upper surface of the insulating substrate 31, and a part of the outer periphery of the central fixed contact pattern 32 is centered on the upper surface of the insulating substrate 31. On one straight line passing through the center of the fixed contact pattern 32 and passing through the midpoints of the linear portions on both sides of the peripheral fixed contact pattern 33 and orthogonal to the linear portions on both sides of the peripheral fixed contact pattern 33, That is, it is drawn to the outer peripheral side of the peripheral fixed contact pattern 33 on the vertical bisector of the linear portion on both sides of the peripheral fixed contact pattern 33, and the lead portion 34 is further extended. The wiring pattern of the center fixed contact pattern 32 is extended and routed in the direction of the center, and a part of the outer peripheral portion of the peripheral fixed contact pattern 33 intersects with the lead-out portion 34 of the center fixed contact pattern 32 and is electrically connected. The lead-out portion 35 is drawn out to the outer peripheral side of the peripheral fixed contact pattern 33 so as not to be connected, and the lead-out portion 35 is further extended and routed in an arbitrary direction to form a wiring pattern of the peripheral fixed contact pattern 33.

  Here, since the lead-out portion 34 of the central fixed contact pattern 32 is drawn out from the central fixed contact pattern 32 surrounded by the peripheral fixed contact pattern 33 to the outer peripheral side of the peripheral fixed contact pattern 33, the peripheral fixed contact pattern 33 is completely formed. When formed in a closed annular shape, the lead-out portion 34 of the central fixed contact pattern 32 is a part of the peripheral fixed contact pattern 33 (the midpoint portion of one of the linear portions on both sides of the peripheral fixed contact pattern 33). Crossed and electrically connected. Therefore, a gap 33a is provided in a part of the peripheral fixed contact pattern 33 (a part intersecting the lead-out portion 34 of the central fixed contact pattern 32), and the peripheral fixed contact pattern 33 is partially opened in an annular shape (C shape). The lead-out portion 34 of the pattern 32 ensures electrical insulation with the peripheral fixed contact pattern 33 by pulling out to the outer peripheral side of the peripheral fixed contact pattern 33 through the gap 33a.

  An insulating film (cover lay) 36 is fixed to the upper surface of the insulating substrate 31 with an adhesive, and the central fixed contact pattern 32 and the peripheral fixed contact are formed from an oval hole 36a provided in the insulating film 36. The pattern 33 is exposed, and the wiring pattern that is an extension of the lead portion 34 of the central fixed contact pattern 32 and the wiring pattern that is an extension of the lead portion 35 of the peripheral fixed contact pattern 33 are covered and protected by the insulating film 36. ing.

  Further, in the hole portion 36a of the insulating film 36, the opposite side portions of a circular dome-shaped metal thin plate having a spring property that can be deformed by pressing, which is used as the movable contact 27 in the above-described conventional switch, are parallel straight lines. A movable contact made of a thin dome-shaped thin metal plate cut out at a point, i.e., a thin metal plate with a spring property that can be deformed by pressing, and the opposite sides of the circular shape in top view are cut out by parallel straight lines. The movable contact 37 formed in the shape of a spherical dome that swells upward straddles the central fixed contact pattern 32 and the lead-out portion 34 of the central fixed contact pattern 32, and is formed on both sides of the movable contact 37 cut out. The lower end peripheral portion constituted by the arc-shaped portions at both ends facing the straight portion in the direction perpendicular to the straight portions is formed at the both ends facing the straight portions on both sides of the peripheral fixed contact pattern 33 in the direction perpendicular to the both ends. Placed on the arcuate portion are accommodated, movable contact is bonded held by the insulating substrate 31 by the adhesive sheet 38. At this time, the movable contact 37 is in a state in which the lower peripheral edge portions at both ends are in contact with the peripheral fixed contact pattern 33, and the central portion is in a state of being opposed to the central fixed contact pattern 32. When viewed from above, the lead-out portion 34 of the center fixed contact pattern 32 also passes through the center of the movable contact 37 with respect to the movable contact 37 and through the midpoints of the linear portions on both sides of the movable contact 37. A straight line perpendicular to the linear portions on both sides of the movable contact 37, that is, a state of being drawn to the outer peripheral side of the peripheral fixed contact pattern 33 on the vertical bisector of the linear portions on both sides of the movable contact 37; Therefore, the lead-out portion 34 of the central fixed contact pattern 32 passes through a portion directly below the midpoint portion of one of the linear portions on both sides of the movable contact 37 with an insulating gap, The movable contact 37 is drawn to the outer peripheral side.

  Here, when the movable contact 37 is mounted, the lead-out portion 34 of the central fixed contact pattern 32 is simply drawn out to the outer peripheral side of the peripheral fixed contact pattern 33 through the gap 33a. Although it passes directly under one of the midpoints with an insulation gap, it is difficult to say that electrical insulation is reliably ensured between the movable contact 37 and the insulation gap alone. Therefore, the insulating film 36 is provided with a projecting portion 39 projecting into the hole 36 a, and the lead-out portion 34 of the center fixed contact pattern 32 is covered with the projecting portion 39, and the linear portions on both sides where the movable contact 37 is cut out. By interposing the protruding portion 39 with one of the midpoint portions, electrical insulation is ensured between the movable contact 37 and the intermediate portion.

  Other conventional switches operate by placing a key top on the adhesive sheet 38 reflecting the dome shape of the movable contact 37 and pressing the central portion of the adhesive sheet 38 via the key top. The center part of the movable contact 37 is inverted in a downwardly convex manner to generate a click feeling, the center part of the movable contact 37 abuts the center fixed contact pattern 32, and the space between the center fixed contact pattern 32 and the peripheral fixed contact pattern 33 is between When the switch is turned on, which is electrically connected through the movable contact 37, and the pressure is released, the central portion of the movable contact 37 that is inverted in the downward convex shape is automatically restored to its original upper position due to its springiness. Thus, the central portion of the movable contact 37 is separated from the central fixed contact pattern 32 and is switched off.

  In another conventional switch assembly, the insulating film 36 is overlaid on the upper surface of the insulating substrate 31 to heat and press the insulating film 36, and the insulating film 36 is attached to the insulating substrate 31 by an adhesive provided on the lower surface of the insulating film 36. After adhering to the adhesive film 38, the movable contact 37 is placed on the peripheral fixed contact pattern 33 in the hole 36a by holding the adhesive sheet 38 to which the movable contact 37 is previously attached to the insulating film 36. Complete by.

  The conventional switch structure described above and other conventional switch structures are known, for example, from Patent Documents 1 to 7 and the like.

JP 2005-317478 A JP 2007-95574 A JP 2008-123945 A JP 7-320591 A Japanese Patent Laying-Open No. 2005-71783 JP 2009-245751 A JP 2008-251178 A

  Along with the downsizing of various electronic devices, the mounting space for operating switches has been reduced, and the downsizing of operating switches has been strongly demanded. The shape of the dome shape makes it easier to reduce the size of the movable switch than the conventional switch structure with a circular dome shape. Therefore, the smaller operation switch adopts the other conventional switch structure. There are more cases to do.

  However, in other conventional switch structures, the movable contact has an oval dome shape with respect to the center fixed contact pattern drawn out to the outer peripheral side of the peripheral fixed contact pattern. The projecting portion that covers the lead-out portion of the center fixed contact pattern, that is, the insulator, is performed in the direction orthogonal to one of the cut-out linear portions (direction a shown by the arrow in FIG. 4), that is, the movable contact Since the center of the movable contact and the center of the key top are misaligned, the center of the movable contact is set to be closer to the center of the movable contact than the conventional switch structure with a circular dome shape. When the movable contact is pushed eccentrically (when the movable contact is pressed at a portion deviated from this center), the click feeling varies greatly and it is difficult to obtain a stable click feeling. There has been a problem to say.

  Specifically, when the movable contact is eccentrically pushed from the center in the drawing direction of the central fixed contact pattern (direction a shown by the arrow in FIG. 4), the vertical two portions of the linear portions on both sides of the movable contact are cut off. Since a certain point on the equipartition line is the lowest point, the movable contact is perpendicular to the center fixed contact pattern drawing direction from the center (b direction indicated by the arrow in FIG. 4) and the center fixed contact pattern drawing direction. 4 (directions c and d indicated by arrows in FIG. 4), that is, when the eccentric contact is pushed in a direction other than the direction in which the central fixed contact pattern is drawn, the movable contact does not easily interfere with the insulator in operation in any direction. Since there is no interference, the same click feeling can be obtained. On the other hand, if the movable contact is eccentrically pushed from the center in the direction of the center fixed contact pattern, the movable contact tends to interfere with the insulator during operation, so the click feeling in this case is fixed to the center from the center. Deterioration is greater than that in the case where the contact pattern is pushed in a direction other than the direction in which the contact pattern is drawn out, resulting in a large difference.

  The present invention has been made in view of the above problems, and its purpose is to provide a click feeling variation with respect to eccentric pressing while using a movable contact made of a small dome-shaped metal thin plate having a spring property that can be deformed by pressing. It is an object of the present invention to provide a switch that can suppress the noise and obtain a stable click feeling.

As first means in the present invention for solving the above problems, an insulating substrate, an inner contact and outer contact constituting a concentric two inner and outer contacts, the inside contact formed in said one surface of the insulating substrate a peripheral fixed contact pattern which is the outer contact of the formed on the one surface of the insulating substrate so as to surround certain central fixed contact pattern and said central fixed contact pattern, a metal thin plate having a deformable spring property by pressing The oval shape in which both opposite sides of the circular shape in the top view are cut out by parallel straight lines, is formed in a spherical dome shape that swells upward, and is mounted on the peripheral fixed contact pattern across the central fixed contact pattern. is location, the both end portions abuts on the peripheral fixed contact pattern, and a movable contact central portion is spaced apart opposed to the central fixed contact pattern, the pressing the movable contact When deformed, the center part of the movable contact abuts on the center fixed contact pattern, and the switch-on state in which the center fixed contact pattern and the peripheral fixed contact pattern are electrically connected through the movable contact. In the switch, the center fixed contact pattern avoids the vertical bisector of the straight portions on both sides of the movable contact and avoids the straight portions on both sides of the movable contact. A lead-out portion that passes below one of the two and pulls out from the central fixed contact pattern to the outer peripheral side of the movable contact is provided, and the peripheral fixed contact pattern has an outer peripheral side of the peripheral fixed contact pattern through the lead-out portion A gap is provided for drawing out to the outside, and the drawing portion is covered with an insulator for ensuring electrical insulation between the drawing portion and the movable contact. And the.
Further, as a second means, in the first means, the lead-out portion is parallel to a perpendicular bisector of the linear portions on both sides of the movable contact, and the movable contact is cut off. It was set as the structure pulled out on the straight line orthogonal to the linear part of the missing both sides.
Further, as a third means, in the second means, the lead-out portion has a perpendicular bisector of the straight portions on both sides of the movable contact as a symmetry axis, and the notch of the movable contact is provided. It was set as the structure pulled out on the parallel straight line orthogonal to the linear part of the both sides.

According to the present invention, an insulating substrate, an inner contact and outer contact constituting a concentric two inner and outer contacts, the are the inner contacts formed on one surface of the insulating substrate central fixed contact pattern and said center fixed a peripheral fixed contact pattern which is the outer contact formed in said one surface of said insulating substrate so as to surround the contact pattern, a metal thin plate having a deformable spring property by pressing both side portions of opposing viewed circular Is formed in the shape of a spherical dome that swells upward, is placed on the peripheral fixed contact pattern across the central fixed contact pattern , and both ends are fixed to the periphery It abuts against the contact pattern, and a movable contact central portion is spaced apart opposed to the central fixed contact pattern, when deformed by pressing the movable contact, the central portion of the movable contact In the center fixed contact pattern contact, switches between the peripheral fixed contact pattern and the central fixed contact pattern is switched on state of being electrically conductively connected via the movable contact, the central fixed contact pattern In order to avoid vertical bisectors of the linear portions on both sides of the movable contact cut out, pass under one of the linear portions on both sides of the movable contact, A lead-out portion is provided that is led out from the central fixed contact pattern to the outer peripheral side of the movable contact, and the peripheral fixed contact pattern is provided with a gap for drawing out to the outer peripheral side of the peripheral fixed contact pattern through the lead-out portion, Since the lead-out part is covered with an insulator for ensuring electrical insulation between the lead-out part and the movable contact, the lead from the center of the movable contact The movable contact is made of an oval dome-shaped metal thin plate having a spring property that is not easily interfered with or interferes with the insulator during operation, and can be deformed by pressing, even when pushed eccentrically in the pull-out direction of the protruding portion. While using the contact, it is possible to provide a switch that can suppress the variation in the click feeling with respect to the eccentric push and obtain a stable click feeling.
Further, the lead-out portion is on a straight line that is parallel to the perpendicular bisector of the linear portions on both sides of the movable contact and that is orthogonal to the linear portions on both sides of the movable contact. In the case where the movable contact is drawn out, the central fixed contact pattern is formed in a space-saving manner equivalent to the conventional one by the one drawing part parallel to the perpendicular bisector of the linear part on both sides where the movable contact is notched. While pulling out to the outer peripheral side of the peripheral fixed contact pattern, interference of the movable contact with the insulator can be suppressed.
In addition, the lead-out portion has a parallel bisector of the linear portions on both sides of the movable contact cut out as a symmetry axis, and is a parallel straight line orthogonal to the linear portions on both sides of the movable contact cut out. In the case of being drawn out above, each of the above-mentioned each of the above-mentioned each of the above-mentioned each of the above-mentioned movable contact points while ensuring the reliability of the conduction by means of two parallel drawing parts with the perpendicular bisector of the linear part of the cut-out both sides The line width of the lead-out part is narrowed, and the distance between the perpendicular bisector of the linear part on both sides of the movable contact and the lead-out part (this distance × 2 = line of each lead-out part) A large gap) can be secured, and interference of the movable contact with the insulator can be suppressed.

It is (A) top view and (B) sectional drawing which show the switch of Example 1 of this invention. It is (A) top view and (B) sectional drawing which show the switch of Example 2 of this invention. It is the top view and (B) sectional view which show the conventional switch. It is (A) top view and (B) cross-sectional side view which show the other conventional switch.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A switch according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 (A) and 1 (B). FIG. 1A is a top view of the switch, and FIG. 1B is a cross-sectional view of the switch.

  As shown in both figures, the switch of Example 1 has a circular central fixed contact pattern 2 which is an inner contact constituting two concentric inner and outer contacts made of a conductive material, and an insulating gap between the central fixed contact pattern 2 and the central fixed contact pattern 2. An oval peripheral fixed contact pattern 3 that is an outer contact that surrounds the insulating substrate 1 is formed on the upper surface of the insulating substrate 1, and a part of the outer peripheral portion of the central fixed contact pattern 2 is centered on the upper surface of the insulating substrate 1. On one straight line passing through the center of the fixed contact pattern 2 and passing through the midpoints of the linear portions on both sides of the peripheral fixed contact pattern 3 and orthogonal to the linear portions on both sides of the peripheral fixed contact pattern 3; That is, in order to avoid the vertical bisector of the straight line portions on both sides of the peripheral fixed contact pattern 3, it is parallel to the vertical bisector and directly aligned with the straight line portions on both sides of the peripheral fixed contact pattern 3. Is drawn to the outer peripheral side of the peripheral fixed contact pattern 3 on one straight line, and the lead-out portion 4 is further extended and routed in an arbitrary direction to be a wiring pattern of the central fixed contact pattern 2, and the peripheral fixed contact A part of the outer peripheral portion of the pattern 3 is drawn to the outer peripheral side of the peripheral fixed contact pattern 3 so as not to be electrically conductively connected, for example, intersecting the lead portion 4 of the central fixed contact pattern 2, The wiring pattern of the peripheral fixed contact pattern 3 is extended and routed in the direction.

  Here, since the lead-out portion 4 of the central fixed contact pattern 2 is drawn out from the central fixed contact pattern 2 surrounded by the peripheral fixed contact pattern 3 to the outer peripheral side of the peripheral fixed contact pattern 3, the peripheral fixed contact pattern 3 is completely When formed in a closed annular shape, the lead-out portion 4 of the central fixed contact pattern 2 avoids a midpoint portion of one of the peripheral fixed contact patterns 3 (one of the linear portions on both sides of the peripheral fixed contact pattern 3). Thus, it is electrically connected by crossing with the portion deviated from the midpoint portion to one end side. Therefore, a gap 3a is provided in a part of the peripheral fixed contact pattern 3 (a portion intersecting with the lead-out portion 4 of the central fixed contact pattern 2), and the peripheral fixed contact pattern 3 has a partially open annular shape (C shape). The lead-out portion 4 of the pattern 2 ensures electrical insulation with the peripheral fixed contact pattern 3 by drawing out to the outer peripheral side of the peripheral fixed contact pattern 3 through the gap 3a.

  An insulating film (coverlay) 6 is fixed to the upper surface of the insulating substrate 1 with an adhesive, and the central fixed contact pattern 2 and the peripheral fixed contact are formed from an oval hole 6a provided in the insulating film 6. The pattern 3 is exposed, and the wiring pattern that is an extension of the lead portion 4 of the central fixed contact pattern 2 and the wiring pattern that is an extension of the lead portion 5 of the peripheral fixed contact pattern 3 are covered and protected by the insulating film 6. ing.

  In addition, in the hole 6a of the insulating film 6, both opposing sides of a circular dome-shaped metal thin plate having a spring property that can be deformed by pressing, which is used as the movable contact 27 in the above-described conventional switch, are parallel straight lines. A movable contact made of a thin dome-shaped thin metal plate cut out at a point, i.e., a thin metal plate with a spring property that can be deformed by pressing, and the opposite sides of the circular shape in top view are cut out by parallel straight lines. The movable contact 7 formed in the shape of a spherical dome that bulges upward (same as the movable contact 37 of another conventional switch) straddles the central fixed contact pattern 2 and the lead portion 4 of the central fixed contact pattern 2 Thus, the lower edge peripheral portion formed by the arc-shaped portions at both ends facing the linear portions on both sides in which the movable contact 7 is notched is perpendicular to the linear portions on both sides of the peripheral fixed contact pattern 3. of Is housed is placed on the arcuate portion of the both ends are opposed to each other in the direction, the movable contact 7 is bonded held by the insulating substrate 1 by the adhesive sheet 8. At this time, the movable contact 7 is in a state in which the lower peripheral edge portions at both ends are in contact with the peripheral fixed contact pattern 3, and the central portion is in a state of being opposed to the central fixed contact pattern 2. When viewed from above, the lead-out portion 4 of the central fixed contact pattern 2 passes through the center of the movable contact 7 with respect to the movable contact 7 and each of the linear portions on both sides where the movable contact 7 is cut out. The vertical bisector so as to avoid one straight line passing through the midpoint and orthogonal to the linear parts on both sides of the movable contact 7, that is, on the vertical bisector of the linear parts on both sides of the movable contact 7 It is in a state of being drawn to the outer peripheral side of the peripheral fixed contact pattern 3 on one straight line that is parallel to the line and orthogonal to the linear portions on both sides of the movable contact 7. The lead-out portion 4 has an insulation gap directly below a portion shifted from the midpoint portion to one end side so as to avoid a portion directly below the midpoint portion of one of the linear portions on both sides of the movable contact 7 cut out. Pass through and pulled out to the outer peripheral side of the movable contact 7 It has become a state.

  Here, when the movable contact 7 is mounted, the lead-out portion 4 of the central fixed contact pattern 2 can be drawn straight to the outer peripheral side of the peripheral fixed contact pattern 3 through the gap 3a. In order to avoid directly under one of the midpoints of one of the parts, it passes directly under the part shifted from the midpoint part to one end side with an insulation gap, but only with the insulation gap, it is between the movable contact 7. It is hard to say that electrical insulation is ensured. Therefore, the insulating film 6 is provided with a protruding portion 9 that protrudes into the hole 6a, and the lead-out portion 4 of the central fixed contact pattern 2 is covered with the protruding portion 9, and the linear portions on both sides where the movable contact 7 is cut off. In order to avoid the midpoint portion of either one of them, an electrical insulation is ensured between the movable contact 7 by interposing the protruding portion 9 between the midpoint portion and the portion shifted to one end side. doing.

  The operation of the switch of the first embodiment is such that when a key top or the like is arranged on the adhesive sheet 8 reflecting the dome shape of the movable contact 7 and the center portion of the adhesive sheet 8 is pressed through the key top, the movable contact The central portion of 7 is inverted in a downwardly convex manner to cause a click feeling, the central portion of the movable contact 7 abuts against the central fixed contact pattern 2, and between the central fixed contact pattern 2 and the peripheral fixed contact pattern 3. Is in a switch-on state in which the conductive contact is electrically connected via the movable contact 7, and when the pressure is released, the center portion of the movable contact 7 that is inverted to the downward convex shape is the original upward convex shape due to its spring property. Thus, the central portion of the movable contact 7 is separated from the center fixed contact pattern 2 and is switched off.

  In the assembly of the switch of Example 1, the insulating film 6 is superposed on the upper surface of the insulating substrate 1 to heat and press the insulating film 6, and the insulating film 6 is attached to the insulating substrate 1 by an adhesive provided on the lower surface of the insulating film 6. After adhering to the adhesive film 8, the movable contact 7 is placed on the peripheral fixed contact pattern 3 in the hole 6 a and held by adhering the adhesive sheet 8 to which the movable contact 7 is adhered in advance to the insulating film 6. Complete by.

  The switch according to the first embodiment as described above has the following effects.

  The switch of Example 1 was formed on one surface of the insulating substrate 1 so as to surround the insulating substrate 1, the central fixed contact pattern 2 formed on one surface of the insulating substrate 1, and the central fixed contact pattern 2. Peripheral fixed contact pattern 3 and a thin metal plate with spring properties that can be deformed by pressing, and a spherical dome shape that bulges upward, with an oval shape in which both opposing sides of the top view are cut out by parallel straight lines And a movable contact 7 placed on the peripheral fixed contact pattern 3 across the central fixed contact pattern 2, and the movable contact 7 is notched in the central fixed contact pattern 2. Avoiding the vertical bisector of the linear portions on both sides, the movable contact 7 passes below one of the cut-out linear portions on both sides, and the movable contact from the center fixed contact pattern 2 To the outer peripheral side of 7 A lead-out portion 4 is provided, and the peripheral fixed contact pattern 3 is provided with a gap 3a for drawing out to the outer peripheral side of the peripheral fixed contact pattern 3 through the lead-out portion 4, and the lead-out portion 4 is connected to the lead-out portion 4 Since it is covered with an insulator (protrusion) 9 for ensuring electrical insulation between the portion 4 and the movable contact 7, the lead-out portion 4 is pulled out from the center of the movable contact 7. Even when pushed eccentrically, the movable contact 7 is made of an oval dome-shaped metal thin plate having a spring property that hardly deforms or does not interfere with the insulator 9 during operation and can be deformed by pressing. On the other hand, it is possible to provide a switch that can suppress a variation in the click feeling with respect to the eccentric push and obtain a stable click feeling.

  Further, the lead-out portion 4 is parallel to the perpendicular bisector of the straight portions on both sides of the movable contact 7 cut out and orthogonal to the straight portions on both sides of the movable contact 7 cut out. Since one lead is drawn out on the straight line, a single lead-out portion 4 parallel to the perpendicular bisector of the straight portion on both sides of the cutout of the movable contact 7 saves space equivalent to the conventional case. Thus, interference of the movable contact 7 with the insulator 9 can be suppressed while the center fixed contact pattern 2 is pulled out to the outer peripheral side of the peripheral fixed contact pattern 3.

  Next, a switch according to the second embodiment of the present invention will be described with reference to FIGS. 2 (A) and 2 (B). 2A is a top view of the switch, and FIG. 2B is a cross-sectional view of the switch.

  As shown in both figures, the switch of Example 2 has a circular central fixed contact pattern 12 which is an inner contact constituting two concentric inner and outer contacts made of a conductive material, and an insulating gap between the central fixed contact pattern 12 and the central fixed contact pattern 12. An oval peripheral fixed contact pattern 13 is formed on the upper surface of the insulating substrate 11, which is an outer contact that surrounds the outer peripheral contacts, and a part of the outer peripheral portion of the central fixed contact pattern 12 on the upper surface of the insulating substrate 11 A part different in position from a part passes through the center of the central fixed contact pattern 12, passes through the midpoints of the linear parts on both sides of the peripheral fixed contact pattern 13, and the linear parts on both sides of the peripheral fixed contact pattern 13 The vertical bisector is defined as an axis of symmetry so as to avoid one perpendicular straight line, that is, on the vertical bisector of the linear portion on both sides of the peripheral fixed contact pattern 13. The movable contact 17 is drawn to the outer peripheral side of the peripheral fixed contact pattern 13 on two parallel straight lines orthogonal to the linear portions on both sides of the cut-out side, and the two lead portions 14a and 14b are at least described later. After being unified on the outer peripheral side of the movable contact 17, preferably on the outer peripheral side of the peripheral fixed contact pattern 13 as shown in the figure, it is further extended and routed in an arbitrary direction to be a wiring pattern of the central fixed contact pattern 12. In addition, a part of the outer peripheral portion of the peripheral fixed contact pattern 13 is pulled out to the outer peripheral side of the peripheral fixed contact pattern 13 so as not to cross the two lead portions 14a and 14b of the central fixed contact pattern 12 and to be electrically connected. The lead portion 15 is further extended and routed in an arbitrary direction to form a wiring pattern of the peripheral fixed contact pattern 13.

  Here, since the two lead portions 14a and 14b of the central fixed contact pattern 12 are drawn from the central fixed contact pattern 12 surrounded by the peripheral fixed contact pattern 13 to the outer peripheral side of the peripheral fixed contact pattern 13, the peripheral fixed contacts When the pattern 13 is formed in a completely closed annular shape, the two lead-out portions 14a and 14b of the central fixed contact pattern 12 have a part of the peripheral fixed contact pattern 13 and a part of which the position is different (peripheral fixed contact). Electrically intersecting with a portion shifted to one end side and a portion shifted to the other end side at equal distances from the midpoint portion so as to avoid the midpoint portion of one of the linear portions on both sides of the pattern 13 Conductive connection is established. Therefore, a portion extending from a portion of the peripheral fixed contact pattern 13 to a portion different in position from the portion (a portion extending from a portion intersecting with one lead portion 14a of the central fixed contact pattern 12 to a portion intersecting with the other lead portion 14b). The peripheral fixed contact pattern 13 has a partially open annular shape (C shape), and the two lead-out portions 14a and 14b of the central fixed contact pattern 12 pass through the single cut 13a. Electrical insulation is ensured with the peripheral fixed contact pattern 13 by drawing out to the outer peripheral side.

  An insulating film (coverlay) 16 is fixed to the upper surface of the insulating substrate 11 with an adhesive, and the central fixed contact pattern 12 and the peripheral fixed contact are formed from an oval hole 16a provided in the insulating film 16. The pattern 13 is exposed, and the wiring pattern and the peripheral fixed contact pattern which are the extended portions after the connecting portions 14c of the two lead portions 14a and 14b of the central fixed contact pattern 12 are integrated through the connecting portions. A wiring pattern that is an extension of the 13 lead-out portions 15 is covered and protected by an insulating film 16.

  Further, in the hole 16a of the insulating film 16, a movable contact 17 identical to the movable contact 7 used in the switch of the above-described first embodiment is provided with two lead-outs of the central fixed contact pattern 12 and the central fixed contact pattern 12. The peripheral edge of the peripheral fixed contact pattern 13 is formed on the lower peripheral edge of the peripheral fixed contact pattern 13 that is formed by the arc-shaped portions at both ends facing the linear portions on both sides across the portions 14a and 14b in the direction perpendicular to the cut-out linear contact portions. The movable contact 17 is held on the insulating substrate 11 by an adhesive sheet 18 by being placed on and accommodated on the arc-shaped portions at both ends opposed to the linear portions on both sides in a direction perpendicular to the both sides. At this time, the movable contact 17 is in a state in which the lower peripheral edge portions at both ends of the movable contact 17 are in contact with the peripheral fixed contact pattern 13, and the central portion of the movable contact 17 is opposed to the central fixed contact pattern 12. It is in a state. When viewed from above, the two lead portions 14 a and 14 b of the center fixed contact pattern 12 pass through the center of the movable contact 17 with respect to the movable contact 17 and are straight lines on both sides where the movable contact 17 is cut out. So as to avoid a straight bisector of the linear portions on both sides of the movable contact 17, that is, on one straight line that passes through the respective midpoints of the movable portions 17 and orthogonal to the linear portions on both sides of the movable contact 17. The vertical bisector is the axis of symmetry, and is drawn to the outer peripheral side of the peripheral fixed contact pattern 13 on two parallel straight lines orthogonal to the linear portions on both sides of the movable contact 17. The two lead portions 14a and 14b of the central fixed contact pattern 12 are formed from the middle point portion so as to avoid a position directly below one of the middle portions of the linear portions on both sides of the movable contact 17 that are notched. Of the part shifted to the one end side in the distance And just below the portion which is shifted downward and the other end side respectively through with an insulating gap in a state drawn toward the outer periphery of the movable contact 17.

  Here, when the movable contact 17 is mounted, the two lead portions 14a and 14b of the central fixed contact pattern 12 can be pulled out to the outer peripheral side of the peripheral fixed contact pattern 13 through one gap 13a. In order to avoid directly below the midpoint portion of one of the missing linear portions, directly below the portion shifted to one end and equidistant from the midpoint portion, and directly below the portion shifted to the other end side However, it cannot be said that electrical insulation is reliably ensured between the movable contact 17 only by the insulation gap. Therefore, the insulating film 16 is provided with a protruding portion 19 protruding into the hole portion 16a, and the two lead portions 14a and 14b of the central fixed contact pattern 12 are integrally covered with the protruding portion 19, and the upper surface of the protruding portion 19 is covered. The groove portion 19c formed between the one protrusion portion 19a reflecting the cross-sectional shape of the one lead-out portion 14a and the other protrusion portion 19b reflecting the cross-sectional shape of the other lead-out portion 14b is movable. Opposed to the midpoint part of one of the linear parts on both sides of the contact 17 that are notched, the part displaced to the one end side at the same distance from the midpoint part of the movable contact 17 and the other end side Electrical insulation is ensured between the movable contact 17 by interposing the protruding portion 19 in a portion extending over the portion.

  The operation of the switch of the second embodiment is such that when a key top or the like is disposed on the adhesive sheet 18 reflecting the dome shape of the movable contact 17 and the center portion of the adhesive sheet 18 is pressed through the key top, the movable contact The center portion of 17 is inverted downwardly to cause a click feeling, the center portion of the movable contact 17 abuts on the center fixed contact pattern 12, and between the center fixed contact pattern 12 and the peripheral fixed contact pattern 13. Is in a switch-on state in which the conductive contact is electrically connected via the movable contact 17, and when the pressure is released, the central portion of the movable contact 17 that is inverted to the downward convex shape is the original upward convex shape due to its spring property. Thus, the central portion of the movable contact 17 is separated from the central fixed contact pattern 12 and is switched off.

  In the assembly of the switch of Example 2, the insulating film 16 is overlaid on the upper surface of the insulating substrate 11 to heat and press the insulating film 16, and the insulating film 16 is attached to the insulating substrate 11 by an adhesive provided on the lower surface of the insulating film 16. After adhering to, the adhesive sheet 18 to which the movable contact 17 is previously attached is bonded to the insulating film 16 so that the movable contact 17 is placed on and held on the peripheral fixed contact pattern 13 in the hole 16a. Complete by.

  The switch according to the second embodiment as described above has the following effects.

  Similar to the switch of the first embodiment, the switch of the second embodiment includes the insulating substrate 11, the central fixed contact pattern 12 formed on one surface of the insulating substrate 11, and the central fixed contact pattern 12 so as to surround the central fixed contact pattern 12. It is composed of a peripheral fixed contact pattern 13 formed on one surface of the insulating substrate 11 and a thin metal plate having a spring property that can be deformed by pressing, and has an oval shape in which both opposite sides of a circular shape in top view are cut out by parallel straight lines. And a movable contact 17 formed on the peripheral fixed contact pattern 13 across the central fixed contact pattern 12 and formed in a spherical dome shape bulging upward. Avoiding the perpendicular bisector of the linear portions on both sides of the movable contact 17 cut out, and passing below one of the linear portions on both sides of the movable contact 17; Leading portions 14 a and 14 b are provided from the central fixed contact pattern 12 to the outer peripheral side of the movable contact 17, and the peripheral fixed contact pattern 13 passes through the leading portions 14 a and 14 b to the outer peripheral side of the peripheral fixed contact pattern 13. A gap 13a is provided for drawing out, and the lead portions 14a and 14b are covered with an insulator (protruding portion) 19 for ensuring electrical insulation between the lead portions 14a and 14b and the movable contact 17. Therefore, even when the eccentric contact is pushed from the center of the movable contact 17 in the drawing direction of the lead-out portions 14a and 14b, the movable contact 17 is less likely to interfere with the insulator 19 during operation, or no longer interferes. While using a movable contact 17 made of an oval dome-shaped metal thin plate having a spring property that can be deformed by pressing, the clamp against eccentric pressing is used. Tsu to suppress the variation of click feeling, it is possible to provide a switch that it is possible to obtain a stable click feeling.

  Further, the lead-out portions 14a and 14b have a perpendicular bisector of the linear portions on both sides where the movable contact 17 is cut off as a symmetry axis, and the linear portions on both sides where the movable contact 17 is cut off. Since two lines are drawn on two orthogonal parallel straight lines, two parallel drawers with the perpendicular bisectors of the linear portions on both sides of the movable contact 17 cut off as the axis of symmetry. The portions 14a and 14b reduce the line width of the lead-out portions 14a and 14b while ensuring the conductive reliability, and the vertical bisectors of the linear portions on both sides of the movable contact 17 that are notched and the respective portions. A large distance between the lead portions 14a and 14b (this distance × 2 = a gap between the lead portions 14a and 14b) is secured to suppress interference of the movable contact 17 with the insulator 19. Can do.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to it, It can implement variously within the range which does not change the summary of this invention.

  For example, with respect to the lead-out portion of the central fixed contact pattern, at least the linear portions on both sides of the movable contact cut out until it passes at least below one of the linear portions on both sides of the movable contact. As long as it is pulled out while avoiding the bisector, the number is not limited to one or two, and may be more than that, and the vertical portions of the linear portions on both sides where the movable contact is cut off may be used. Not only a straight line parallel to the bisector, but also a slope that changes (increases or decreases) the distance between the perpendicular bisector of the linear part on both sides of the movable contact cutout along the pull-out direction It may be linear, curved, or bent. However, in the case where it intersects with the perpendicular bisector of the linear part on both sides where the movable contact is cut off, it should intersect at least the outer periphery of the movable contact, preferably the outer periphery of the peripheral fixed contact pattern. Limited.

  In addition, as for the insulator covering the lead portion, it is sufficient that at least the lead portion is covered with an insulating material and insulation can be ensured between the movable contact, so that an insulating film (for example, polyimide) that forms a coverlay of the insulating substrate In addition to those comprising a part of a film or a resin film such as polyethylene terephthalate), an insulating film separate from the insulating film, or a resist applied to the surface of the lead-out portion may be used.

  In addition, when there are a plurality of lead-out portions, each lead-out portion may be individually covered in addition to the case of covering all with one insulator. In this case, it is possible to eliminate the insulating portion as well as the lead-out portion from the perpendicular bisector of the linear portion on both sides where the movable contact is notched.

DESCRIPTION OF SYMBOLS 1,11 Insulation board | substrate 2,12 Center fixed contact pattern 3,13 Peripheral fixed contact pattern 3a, 13a Breakage 4,14a, 14b Lead-out part 7,17 Movable contact 9,19 Protrusion part (insulator)

Claims (3)

An insulating substrate;
An inner contact and an outer contact constituting two concentric inner and outer contacts, the central fixed contact pattern being the inner contact formed on one surface of the insulating substrate, and the insulating substrate so as to surround the central fixed contact pattern a peripheral fixed contact pattern which is the outer contact formed in said one surface of,
It is made of a thin metal plate that has a spring property that can be deformed by pressing, and is formed in a spherical dome shape that bulges upward, with an oval shape with opposite sides of a circular shape in top view cut out by parallel straight lines. It is placed on the peripheral fixed contact pattern across the contact pattern , both ends abut against the peripheral fixed contact pattern, and a central portion includes a movable contact facing the central fixed contact pattern at a distance .
When the movable contact is deformed by pressing, the central portion of the movable contact comes into contact with the central fixed contact pattern, and the central fixed contact pattern and the peripheral fixed contact pattern are electrically connected via the movable contact. In the connected switch that is in the on state,
The central fixed contact pattern avoids the perpendicular bisector of the linear portions on both sides of the movable contact and is below one of the linear portions on both sides of the movable contact. A lead-out portion that passes through the side and is drawn out from the central fixed contact pattern to the outer peripheral side of the movable contact,
The peripheral fixed contact pattern is provided with a gap for drawing out to the outer peripheral side of the peripheral fixed contact pattern through the lead-out part,
The switch, wherein the drawer part is covered with an insulator for ensuring electrical insulation between the drawer part and the movable contact.   The lead-out portion is drawn out on a straight line that is parallel to the perpendicular bisector of the linear portions on both sides of the movable contact and that is orthogonal to the linear portions on both sides of the movable contact. The switch according to claim 1, wherein the switch is a switch.   On the parallel straight line perpendicular to the linear bisectors on both sides of the movable contact, with the drawer portion having a perpendicular bisector of the linear portions on both sides of the movable contact cut out 3. The switch according to claim 2, wherein the switch is pulled out.

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