JP2013168266A - Sheet with movable contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet with a movable contact including a projection for depression to be used for input operation parts of various kinds of electronic equipment capable of preventing displacement of the projection for depression, and by which a successful operation feeling is obtained.SOLUTION: In a sheet with a movable contact obtained by providing a projection part 21B projecting upward at a position according to the center part of a movable contact 3 on a base sheet 21 which holds the movable contact 3 on its lower surface, and inserting a projection 25 for depression into the projection part 21B, it is constituted so that dimensions of the inside of a root part of the projection part 21B become larger than dimensions at the lower part of the projection 25 for depression.

Description

  The present invention relates to a sheet with a movable contact that is used in an input operation unit of various electronic devices and is mounted on a wiring board having a fixed contact to constitute a panel switch.

  2. Description of the Related Art In recent years, various types of electronic devices have adopted a sheet with a movable contact that is mounted on a wiring board having a fixed contact and constitutes a panel switch.

  Such a conventional sheet with a movable contact will be described with reference to FIGS.

  FIG. 10 is a sectional view of a conventional sheet with movable contacts, FIG. 11 is an exploded perspective view thereof, FIG. 12 is a sectional view in the same mounting state, and FIG. 13 is a sectional view showing an operation state in the same mounting state.

  In the figure, reference numeral 1 denotes a base sheet made of an insulating film having flexibility, and an adhesive 1A is applied to the lower surface. Reference numeral 3 denotes a movable contact made of an elastic thin plate metal formed in an upward convex dome shape, and its upper surface is adhered by an adhesive 1A and held at a predetermined position on the lower surface of the base sheet 1.

  Here, the base sheet 1 is formed with a protruding portion 1 </ b> B protruding upward in a columnar shape at a position corresponding to the center position of the movable contact 3 for each arrangement position of the movable contact 3. In the protruding portion 1B, a resin-made pressing projection 5 formed in a columnar shape is fitted without a gap, and the upper surface and side surfaces of the pressing projection 5 are adhered and held by the adhesive 1A in the protruding portion 1B. Yes.

  Reference numeral 2 denotes a spacer sheet made of an insulating film formed with substantially the same outer shape as that of the base sheet 1, and is adhered to the lower surface side of the base sheet 1 with an adhesive 1A. The spacer sheet 2 is provided with movable contact accommodating holes 2B that are slightly larger than the outer periphery of the movable contact 3 for each arrangement location corresponding to the movable contact 3, and a plurality of movable contact accommodating holes 2B are provided. A groove part cut out with a predetermined width is provided so as to be connected. An adhesive 2 </ b> A is formed on the lower surface of the spacer sheet 2. These constitute a conventional sheet with a movable contact.

  As shown in FIG. 12, the above-mentioned sheet with a movable contact is used by being stuck on a wiring board 7 of an electronic device typified by a mobile phone. On the wiring board 7, an outer fixed contact 8 corresponding to the outer peripheral portion of the movable contact 3 and a central fixed contact 9 corresponding to the central portion of the movable contact 3 are electrically arranged on the upper surface. And the sheet | seat with a movable contact mounts the outer periphery lower end of the movable contact 3 on the outer side stationary contact 8, and is bonded together on the wiring board 7 with the adhesive 2A of the spacer sheet | seat 2, and is comprised by the panel switch.

  An operation button 14 is disposed above the panel switch. The operation button 14 is arranged to be movable up and down by projecting the operation portion 14A from the button hole of the panel case 15, and the lower surface of the substantially cylindrical pressing portion 14B protruding downward is provided on the base sheet 1. It contacts the upper surface position of the protruding portion 1B.

  Next, the operation will be described. When a pressing force is applied to the operation portion 14A, the pressing force is applied to the movable contact 3 from the pressing portion 14B via the base sheet 1 and the pressing protrusion 5 below the base sheet 1. When the pressing force to the movable contact 3 exceeds a predetermined magnitude, as shown in FIG. 13, the dome-shaped central portion of the movable contact 3 is elastically inverted to a downward convex shape with a click feeling, and the central fixed contact 9 is contacted. As a result, the outer fixed contact 8 and the central fixed contact 9 are electrically connected via the movable contact 3, and the switch is turned on.

  When the pressing force applied to the operation portion 14A is released, the dome-shaped central portion of the movable contact 3 is elastically returned to the original upward convex shape with a click feeling by the elasticity of the movable contact 3 itself. As a result, the central portion of the movable contact 3 is separated from the central fixed contact 9, the outer fixed contact 8 and the central fixed contact 9 are insulative, and the switch is turned off.

  As described above, the conventional seat with the movable contact is configured such that the pressing force from the pressing portion 14 </ b> B of the operation button 14 is transmitted to the central portion of the movable contact 3 through the pressing protrusion 5. That is, in the sheet with the movable contact, even if the center position of the pressing portion 14B and the center position of the movable contact 3 are mounted in a combined state, the central portion of the movable contact 3 is always interposed via the pressing protrusion 5. Since it is configured to be pressed, variation in click feeling due to mounting displacement can be suppressed. Moreover, in the sheet | seat with a conventional movable contact, it presses by making it the structure which stuck the protrusion 5 for a press in the protrusion part 1B without gap, and stuck the upper surface and the side surface with the adhesive 1A in the protrusion part 1B. As a result of firmly holding the projection 5, the durability such as the positional deviation of the pressing projection 5 with respect to the number of operations after assembling the electronic device, that is, the so-called number of keystrokes has been improved.

  As prior art document information related to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.

JP 2006-216291 A JP 2008-159553 A

  However, in the conventional sheet with movable contacts, the base sheet 1 is adhered with the adhesive 1A around the side surface of the pressing protrusion 5 and the movable contact 3 near the outer periphery of the lower surface of the pressing protrusion 5. Since both the upper surface positions were adhered with the adhesive 1A, the deformation stress of the base sheet 1 was greatly influenced during the reversing operation of the movable contact 3, and there was a possibility that the operation feeling was dull.

  The present invention solves such a conventional problem, and the influence of the deformation stress of the base sheet on the movable contact is reduced, the dullness of the operation feeling is suppressed, and the movable operation that provides a good operation feeling during operation is obtained. It aims at providing the sheet | seat with a contact.

  In order to achieve the above object, the present invention has the following configuration.

  The present invention provides a sheet with a movable contact having a base sheet made of an insulating film having flexibility, and a movable contact made of an elastic thin plate metal in an upward convex dome shape held on the lower surface of the base sheet. The base sheet includes a protruding portion that is formed to protrude upward at a position corresponding to the center position of the movable contact, holds the upper portion of the pressing protrusion inserted into the protruding portion, and The sheet is provided with a movable contact, characterized in that the inner dimension of the base part is set larger than the dimension of the lower part of the pressing protrusion.

  In this case, the position of the upper surface of the movable contact near the outer periphery of the lower portion of the pressing protrusion and the lower surface of the pressing protrusion can be configured not to be attached to the base sheet. The influence of the deformation stress of the sheet is reduced, and the influence on the reversing operation of the movable contact can be reduced.

  As described above, according to the present invention, at the time of operation of the movable contact, the influence of the deformation stress of the base sheet on the movable contact is reduced, the dullness of the operation feeling is suppressed, and the movable operation that can obtain a good operation feeling at the time of operation. The advantageous effect that a sheet with contacts can be provided is obtained.

Sectional drawing of the sheet | seat with a movable contact by one embodiment of this invention Exploded perspective view Cross section in the same mounting state Sectional view showing the operating state in the same mounting state Schematic diagram explaining the processing method of the protruding part of the base sheet Schematic diagram showing the relationship between the distance traveled by the probe and the pressing force when pressing a sheet with a movable contact A diagram summarizing the relationship between the inner diameter of the base of the protrusion and the amount of change in pushing force A diagram summarizing the relationship between the root inner diameter of the protrusion and the amount of change in click rate Sectional drawing of the sheet | seat with a movable contact by other embodiment of this invention Sectional view of a conventional sheet with movable contacts Exploded perspective view Cross section in the same mounting state Sectional view showing the operating state in the same mounting state

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.

(Embodiment)
1 is a cross-sectional view of a sheet with a movable contact according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a cross-sectional view in the same mounting state, and FIG. 4 shows an operation state in the same mounting state. It is sectional drawing.

  In the figure, 21 is a base sheet made of an insulating film having flexibility (for example, made of PET film), and an adhesive 21A is formed on the lower surface thereof. The movable contact 3 is held at a predetermined position on the lower surface of the base sheet 21 by sticking the upper surface to the adhesive 21A. Reference numeral 25 denotes a resin-made pressing protrusion formed in a substantially cylindrical shape and disposed at a position above the center of the movable contact 3, and is disposed between the base sheet 21 and the movable contact 3 in the same manner as the conventional one. It is inserted into a protruding part 21B protruding upward provided at the position of the base sheet 21 corresponding to the center position of the movable contact 3, and is stuck and held by the adhesive 21A in the protruding part 21B. The pressing protrusion 25 is only placed on the movable contact 3 and is not adhesively fixed to the movable contact 3.

  Here, the protrusion 21B has a substantially cylindrical trapezoidal shape, and the upper surface inner diameter of the protrusion 21B is set to be the same as the outer diameter of the upper surface of the pressing protrusion 25, and the base inner diameter of the protrusion 21B is the same as that of the protrusion 21B. The dimension is set larger than the inner diameter of the upper surface. In addition, although mentioned later for details, it is preferable when the base part internal diameter of the protrusion part 21B is set 1.2 to 1.7 times with respect to an upper surface internal diameter.

  The flat surface of the pressing protrusion 25 is bonded to the adhesive 21A formed in the protruding portion 21B over the entire surface. At the time of manufacture, since the flat upper surface of the pressing protrusion 25 is pressed against the adhesive 21A, the side portions near the outer edge of the upper surface of the pressing protrusion 25 are also slightly adhered to the adhesive 21A. In this state, only the upper part of the pressing protrusion 25 is bonded with the adhesive 21A. On the other hand, the side surface portion of the lower portion of the pressing protrusion 25 is in a state where there is a slight gap over the entire circumference without sticking to the adhesive 21A of the protruding portion 21B.

  Furthermore, the base sheet 21 also has an upper surface position of the movable contact 3 that is in the vicinity of the outer edge of the lower surface of the pressing protrusion 25 within the protruding portion 21B, that is, a position between the outer edge of the lower surface of the pressing protrusion 25 and the root portion of the protruding portion 21B. It is in the state where a clearance gap was slightly opened in the shape of a circular ring, without being pasted with adhesive 21A. That is, when viewed from the movable contact 3, the component has a larger area of the central upper surface portion not bonded to the base sheet 1 than the conventional product.

  Reference numeral 22 denotes a spacer sheet made of an insulating film (for example, made of a PET film) having substantially the same outer shape as that of the base sheet 21, and is adhered to the lower surface side of the base sheet 21 via an adhesive 21A. The spacer sheet 22 has movable contact accommodating holes 22B slightly larger than the outer periphery of the movable contact 3 for each arrangement position corresponding to the movable contact 3, and further connects the plurality of movable contact accommodating holes 22B. In addition, a groove portion cut out with a predetermined width is provided. An adhesive 22 </ b> A is formed on the lower surface of the spacer sheet 22.

  The sheet with a movable contact according to the present invention is configured as described above, and is used by being mounted on a wiring board of an electronic device typified by a mobile phone as in the prior art. The mounting state is shown in FIG.

  The mounting state will be described with reference to the same figure. The sheet with the movable contact is configured so that the lower end and the central portion of the outer periphery of the movable contact 3 correspond to the outer fixed contact 8 and the central fixed contact 9 on the wiring board 7 as in the prior art. A panel switch is formed by adhering to the wiring board 7 with an adhesive 22A on the lower surface of the spacer sheet 22. An operation button 14 and a panel case 15 are arranged above the panel switch, and the operation button 14 has an operation part 14A and a pressing part 14B, etc., as in the conventional case.

  Next, the operation will be described. When a pressing force is applied to the operation portion 14A, a pressing force is applied to the central portion of the movable contact 3 from the pressing portion 14B via the base sheet 21 and the pressing protrusion 25 positioned below the base sheet 21. When the pressing force to the movable contact 3 exceeds a predetermined magnitude, as shown in FIG. 4, the dome-shaped central portion of the movable contact 3 is elastically inverted to a downward convex shape with a click feeling, and the central fixed contact 9 is contacted. As a result, the outer fixed contact 8 and the central fixed contact 9 are electrically connected via the movable contact 3, and the switch is turned on. When the pressing force applied to the operation portion 14A is released, the movable contact 3 elastically returns to the original upward convex shape with a click feeling, so that the outer fixed contact 8 and the central fixed contact 9 are insulated. Thus, the switch is turned off.

  Here, as described above, in the sheet with the movable contact, the side surface portion of the lower portion of the pressing protrusion 25 does not stick to the adhesive 21A in the protruding portion 21B, and is in a state where there is a slight gap. In addition, the lower surface of the pressing protrusion 25 and the position of the upper surface of the movable contact 3 corresponding to the vicinity of the outer edge thereof are not bonded to the base sheet 21. For this reason, during the above operation, the influence of the deformation stress of the base sheet 21 on the movable contact 3 is reduced, and the influence on the reversing operation of the movable contact 3 can be reduced. In other words, it is possible to realize a device in which the dullness of the operation feeling is suppressed and a good operation feeling can be obtained during operation.

  Below, the content which examined the influence which the internal diameter dimension of the base part of the protrusion part 21B formed in the base sheet 21 has on the operation feeling in the sheet | seat with a movable contact mentioned above is demonstrated.

  In this study, a JIS G 4313 stainless steel strip for spring SUS301 and an elastic thin plate metal with a plate thickness of 0.055 mm were used for the movable contact 3, and a round shape with an outer diameter of φ4 mm was used. It was. The pressing protrusion 25 is made of JIS K 6900 made of polyethylene terephthalate (PET), and is 0.125 mm in height formed by punching from a film having a thickness of 0.125 mm into a cylindrical shape having an outer diameter of φ1.2 mm. Was carried out.

  The base sheet 21 is made of PET with a material thickness of 50 μm, and the adhesive 21A formed on the lower surface thereof is acrylic, and in the holding power test according to JIS Z 0237, the bonding range is 70 ° C. in an environment of 70 ° C. A sheet having a width of 20 mm and a length of 20 mm was affixed to a steel sheet, a 1000 g weight was added in the vertical direction, and the amount of deviation after 20 minutes was 0.1 mm or less.

  Next, a method for forming the protruding portion 21B of the base sheet 21 will be described. FIG. 5 is a schematic view for explaining a method of processing the protruding portion of the base sheet. The protruding portion 21B causes the pressing adhesive 25 to adhere to and hold the exposed adhesive 21A on the flat base sheet 21, and then the adhesive 21A to prevent adhesion of dust to the adhesive 21A and the like. From the side, it was formed by hot-pressing the work-in-process with the peeled surface of the protective sheet 27 bonded.

  The hot pressing was performed using a hot pressing die 31 and a punch 32. The following description will be made with reference to FIG. 5 in which the die 31 is in the upper position and the punch 32 is in the lower position, but the installation position relationship between the die 31 and the punch 32 is limited to this. Not done.

  The die 31 is installed so as to be positioned above the base sheet 21, and a cylindrical recess 31 </ b> A set to have a predetermined diameter larger than the pressing protrusion 25 is provided on the lower surface of the die 31. . The punch 32 installed below the die 31 is movable up and down, and the center position thereof is installed in accordance with the center position of the recess 31A. The work-in-progress is a pressing projection in which the base sheet 21 is in the upper position and the protective sheet 27 is in the lower position and is passed between the die 31 and the punch 32 and the upper surface is held by the adhesive 21A. The center position of 25 is set at a position adjusted to the center position of the recess 31A. Here, the punch 32 installed at a position sandwiching the work-in-process under the die 31 has a cylindrical shape with a flat upper end, and has an outer diameter that is equal to or slightly larger than the pressing protrusion 25 in a top view. What is set is used.

  Then, the punch 32 is moved upward while maintaining the temperature at the position of the recess 31 </ b> A of the die 31 at a predetermined high temperature, and the pressing protrusion 25 is pushed upward via the protective sheet 27. While the protrusion 21 is formed so as to protrude upward, the pressing protrusion 25 is moved to a position in the recess 31 </ b> A of the die 31 to form a truncated cone-shaped protrusion 21 </ b> B that expands downward. Note that the punch 32 is set to stop by being raised to a height position at which the base sheet 21 is slightly pressed against the top surface of the recess 31A.

  With the processing method described above, the protrusion 21B can be formed and the pressing protrusion 25 can be inserted into the protrusion 21B at the same time, and the upper surface inner diameter of the protrusion 21B can be easily adjusted to the outside of the upper surface of the pressing protrusion 25. It is preferable because it can be processed into a dimension equivalent to the diameter. In addition, it is preferable that the base portion of the protruding portion 21B can be simultaneously formed into a size corresponding to the recessed portion 31A set to a predetermined diameter dimension larger than that of the pressing projection 25.

  In this study, several types were prepared by changing the diameter of the recess 31A of the die 31 to change the inner diameter of the base of the protrusion 21B in the range of φ1.4 to φ2.0 mm. That is, since the pressing protrusion 25 having a diameter of 1.2 mm is used as described above, the upper surface inner diameter of the protruding portion 21B is 1.2 mm, and the root inner diameter is about 1.1 to 1.7 times the upper surface inner diameter. Several types were created that varied within the range.

  Next, a method for measuring the operation feeling will be described. FIG. 6 is a schematic diagram showing the relationship between the moving distance of the measuring element and the pressing force when the sheet with movable contact is pressed. When pressing a sheet with a movable contact using a cylindrical push rod made of metal and set to a predetermined size as a measuring element, the relationship between the force applied to the measuring element and the amount of movement of the measuring element becomes the curve shown in FIG. . The horizontal axis represents the movement distance (stroke) of the probe, and the vertical axis represents the force (pressing force) applied to the probe. As shown in the figure, the value of P1 which is the pressing force immediately before the movable contact 3 is elastically reversed by the pressing operation is digitized as “pressing force”, and the value of the pressing force P1 and the pressing force immediately after the elastic reversal is expressed. The value of (P1−P2) × 100 / P1 with the ratio of the difference between the pressure P2 (P1−P2) and the pressing force P1 as a percentage was quantified as “click rate”. The unit of “pushing force” is (N), and the unit of “click rate” is (%).

  In this study, the above-described measurement was performed in the form of a sheet with a movable contact, and also in the form of a movable contact 3 alone used in the sheet with a movable contact. Then, the values obtained by subtracting the values of “pushing force” and “click rate” in the form of the sheet with the movable contact from the values of “pushing force” and “click rate” in the form of the movable contact 3 alone, respectively, As the amount of change in “pushing force” and the amount of change in “click rate”, the relationship with the root inner diameter of the protruding portion 21B is summarized.

  FIG. 7 is a diagram summarizing the relationship between the root inner diameter of the protrusion and the amount of change in pressing force, and FIG. 8 is a diagram summarizing the relationship between the root inner diameter of the protrusion and the click rate variation.

  As shown in FIG. 7, the amount of change in the pressing force decreased as the root inner diameter of the protruding portion 21B increased. This is because the influence of the deformation stress of the base sheet 21 on the movable contact 3 is reduced due to the increase in the inner diameter of the base portion of the protruding portion 21B, and the pressing force of the sheet with the movable contact is pushed in the state of the movable contact 3 alone. Presumed to have approached power. As can be seen from the figure, in the case of this configuration, the amount of change in the pressing force gradually decreased until the root inner diameter of the protruding portion was φ1.4 to φ1.6 mm. And the inclination angle of φ1.5 to φ1.6 mm is gentle with respect to the inclination angle of φ1.4 to φ1.5 mm, and is almost constant in the range from φ1.6 mm to φ2.0 mm. . Therefore, if the base portion inner diameter of the protruding portion 21B is in the range of φ1.5 mm to φ2.0 mm, that is, about 1.2 to 1.7 times the upper surface inner diameter, the deformation of the base sheet 21 is reduced. It was inferred that the effect of reducing the influence of stress could be greatly obtained.

  Further, if the base portion inner diameter of the protruding portion 21B is in the range of φ1.6 mm to φ2.0 mm, that is, about 1.3 to 1.7 times the upper surface inner diameter, the amount of change in the pressing force Is more preferable because of a smaller value. If the protrusion 21B has a root inner diameter in the range of φ1.6 mm to φ1.9 mm, that is, a range of about 1.3 to 1.6 times the upper surface inner diameter, the protrusion 21B Even if the finished dimension of the inner diameter of the root portion changes within a predetermined range, it is more preferable that a variation in variation in the pressing force is small.

  In addition, as shown in FIG. 8, the change amount of the click rate tended to slightly decrease as the root inner diameter of the protruding portion increased. Similarly to the above, it is presumed that the influence of the deformation stress of the base sheet 21 on the movable contact 3 is reduced and the click rate of the movable contact 3 alone is approached. Therefore, it has been found that the inner diameter of the base portion of the protruding portion 21B is preferable if it is within the above-described dimension range, because the click rate is improved.

  A so-called keying life test was performed in which the pressing operation was repeated with the above-described various movable contact-attached sheets attached to and mounted on a predetermined wiring board. The protrusion 21B had an inner diameter of φ1.4 to 2.0. Even in the sheet with the movable contact, the positional deviation of the pressing protrusion 25 was slight and there was no problem in actual use.

  As described above, according to the present embodiment, the influence of the deformation stress of the base sheet 21 on the reversing operation of the movable contact 3 can be reduced during the operation of the movable contact 3, and the operation during the operation can be reduced. It is possible to realize a sheet with a movable contact that can suppress the dullness of the feeling and obtain a good operation feeling.

  Here, the sheet with a movable contact of the idea according to the present invention is also used in a form in which the light guide sheet 28 is disposed above. An example of this is shown in FIG.

  FIG. 9 is a cross-sectional view of a sheet with movable contacts according to another embodiment of the present invention. In the same figure, the light guide sheet 28 scatters light to a base material made of an insulating film such as TPU resin or acrylic resin (PMMA) having smooth and flexible upper and lower surfaces and high light transmittance. Protruding scattering portion 29A is provided, and its outer shape is almost the same as that of base sheet 21, and is arranged on base sheet 21, and the outer edge lower surface is attached to base sheet 21 via adhesive 28A. Has been. Thus, a sheet with a movable contact to which a light guide function is added is configured.

  Then, like the above-described sheet with the movable contact, the component is also attached and mounted on the wiring board 7 (not shown), and is guided to the central portion of the movable contact 3 by the pressing portion 14B of the upper operation button 14. The switch is turned on / off by pressing the upper surface position of the light sheet 28.

  Further, in the sheet with the movable contact to which the light guide function described above is added, the LED (not shown) provided on the wiring board 7 is disposed adjacent to the side end surface of the light guide sheet 28 in the mounted state. The light guide sheet 28 takes in the light from the LED into the base material from the side end face, propagates the light in the base material, and the scattered light is disposed at a position corresponding to the movable contact 3. The upper operation button 14 can be illuminated by being scattered by the portion 29A.

  Here, in the configuration, as shown in FIG. 9, an uneven surface 21 </ b> C is provided at the upper surface position of the protruding portion 21 </ b> B of the base sheet 21 corresponding to the pressing protrusion 25. This configuration is desirable because it prevents the upper surface position of the protruding portion 21B of the base sheet 21 and the lower surface of the light guide sheet 28 from being in close contact. That is, the uneven surface 21C reduces the contact area with the light guide sheet 28, and even if the light guide sheet 28 made of TPU has high tackiness, the base sheet 21 portion at the upper surface position of the protruding portion 21B is guided. The phenomenon of sticking to the lower surface of the light sheet 28 is less likely to occur, scattering of light from the contact surface or the like is suppressed, and the operation buttons 14 are prevented from being illuminated in a non-uniform state, which is useful.

  In addition, although the formation method of 21 C of uneven surfaces mentioned above is not specifically limited, In the process of the hot press process shown in FIG. 5, what provided the predetermined unevenness | corrugation to the top | surface of the hollow part 31A provided in the die | dye 31 As described above, the uneven state of the top surface of the depression 31A may be transferred and formed on the base sheet 21 at the top dead center of the punch 32. This is desirable because, without increasing the processing equipment, in addition to the formation of the protruding portion 21B and the insertion of the pressing protrusion 25, a predetermined uneven surface 21C can be simultaneously formed on the upper surface of the protruding portion 21B.

  In the above-described embodiment, the pressing protrusion 25 is described as having a substantially cylindrical shape. However, the shape is not particularly limited. For example, the pressing protrusion 25 has a truncated cone shape with a small bottom surface. And so on. Also, it may be a polygonal column shape, etc. If it is a polygonal column shape, the base sheet protruding portion is a polygonal column with a shape that is similar to the polygon on the inside of the top surface. A trapezoidal shape or the like may be used.

  In addition, although the thing provided with the several movable contact 3 was demonstrated above, the quantity of the movable contacts 3 is not limited, The sheet | seat with a movable contact comprised by one may be sufficient, Furthermore, the movable contact 3 The shape may be circular when viewed from above, or may be polygonal, oval, or substantially elliptical.

  Further, the position where the pressing protrusion is disposed may be other than the central portion of the movable contact as long as the click feeling of the movable contact to be used is the best.

  Furthermore, the configuration concept according to the present invention can be applied to a sheet with a movable contact that does not have the spacer sheet 22.

  The sheet with a movable contact according to the present invention can reduce the influence of the deformation stress of the base sheet on the reversal operation of the movable contact during the operation of the movable contact, suppresses the dull operation feeling during operation, This has an advantageous effect of providing a sheet with a movable contact that can provide a good operation feeling, and is useful for input operation sections of various electronic devices.

DESCRIPTION OF SYMBOLS 3 Movable contact 7 Wiring board 8 Outer fixed contact 9 Center fixed contact 14 Operation button 14A Operation part 14B Press part 15 Panel case 21 Base sheet 21A, 22A, 28A Adhesive 21B Protrusion part 21C Uneven surface 22 Spacer sheet 25 Pressing protrusion 27 Protective sheet 28 Light guide sheet 29A Scattering part 31 Die 31A Depression part 32 Punch

Claims (2)

A sheet with a movable contact having a base sheet made of an insulating film having flexibility, and a movable contact made of an elastic thin plate metal in an upward convex dome shape held on the lower surface of the base sheet, The base sheet includes a protruding portion that protrudes upward at a position corresponding to the center position of the movable contact, holds the upper portion of the pressing protrusion inserted into the protruding portion, and a base portion of the protruding portion A sheet with a movable contact, wherein an inner dimension is set larger than a dimension of a lower portion of the pressing protrusion. The sheet with a movable contact according to claim 1, wherein the pressing protrusion has a cylindrical shape, and a dimension inside the base portion of the protruding portion is set to 1.2 to 1.7 times the dimension of the pressing protrusion.

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