JP6593186B2 - Push button mounting structure - Google Patents

Description

  The present invention relates to a push button attachment structure for attaching an operation push button to a case.

  For example, a push button operated by a pressing operation is attached to a case of a portable electronic device. The push button is, for example, a power button. A switch which is a circuit element is accommodated in the case, and the switch inside the case is turned ON / OFF by pressing the power button from the outside of the case.

  The case is, for example, a box shape including a plurality of side surfaces orthogonal to the upper surface, the lower surface, and the upper and lower surfaces. Such a case is often formed by a combination of two parts, an upper case having an upper surface and a lower case having a lower surface. If it is a rectangular parallelepiped shape, the upper case has an upper surface and four side surfaces, and the lower case has a lower surface and four side surfaces. Each of the upper case and the lower case has a configuration in which a side wall portion that constitutes a side surface and a plane portion that constitutes an upper surface or a lower surface are arranged orthogonal to each other.

  Patent Document 1 discloses a push button mounting structure in which a push button is attached to the inner wall surfaces of a side wall portion and a flat portion that are orthogonally arranged in such a case. The push button described in Patent Document 1 has a substantially L shape having a first arm portion and a second arm portion extending along the inner wall surfaces of the side wall portion and the flat portion (FIG. 1). A pressing portion is formed at one end portion which is a free end of the first arm portion, and one end portion of the second arm portion is connected to the other end portion. A screw hole for screwing is formed at the other end which is the free end of the second arm.

  The push button uses a screw hole in a state where the longitudinal direction of the first arm portion is arranged parallel to the inner wall surface of the side wall portion and the longitudinal direction of the second arm portion is arranged parallel to the inner wall surface of the flat portion. It is fixed to the case with screws.

Japanese Utility Model Publication No. 63-58433

  However, the push button mounting structure of the case of the portable electronic device is required to be as simple as possible since the cost is severely limited. In the push button mounting structure described in Patent Document 1, it is necessary to position the pressing portion of the push button and then screw it while maintaining that state. In addition, since a separate member for attaching a push button such as a screw or an adhesive is required, the parts cost is increased.

  An object of this invention is to provide the push button attachment structure which can attach a push button easily in a case, without using the separate member for push button attachment.

  In order to achieve the above object, in a case having a side wall portion and a flat surface portion arranged orthogonal to each other, a push button having a pressing portion operated to be pressed from the outside of the case is provided on the inner wall surface of the side wall portion and the flat surface portion. In the push button mounting structure for mounting, the side wall portion has an opening that exposes the pressing portion to the outside, the flat surface portion has a protruding portion erected on the inner wall surface, and the push button has a free end and The first arm portion is formed with a pressing portion at one end portion and elastically deforms when the pressing portion is pressed, and the inner wall surface of the side wall portion is attached to the inner wall surface of the side wall portion and the flat surface portion. A first arm that extends in parallel with the other end and abuts against the inner wall surface of the flat portion, one end connected to the other end of the first arm, and a projecting portion on the other end serving as a free end. A second arm part formed with a fitting hole to be fitted and elastically deformed; In the attached state, it has a second arm part extending in parallel with the inner wall surface of the flat part, and further, in the second arm part, the length from one end of the second arm part to the fitting hole is in the attached state. The one end portion of the second arm portion and the inner wall surface of the side wall portion are in contact with each other, and the inner wall on the side wall portion side of the fitting hole to be fitted into the protruding portion is in contact with the protruding portion.

  The fitting hole formed in the other end portion of the second arm portion is preferably a cutout portion formed in the other end portion.

  The fitting hole formed in the other end portion of the second arm portion is preferably a long hole formed in the other end portion.

  The case is preferably a resin molded product.

  The case is configured by a combination of the first case and the second case, and the opening is formed in either the first case or the second case. In the case, the first case and the second case are divided. It is preferable to be formed at a position that does not overlap the line.

  According to the present invention, it is possible to easily attach the push button in the case without using a member for attaching the push button.

It is an external appearance perspective view of the portable recording device in which a push button attachment structure is used. It is a disassembled perspective view of the portable recording device in which the push button mounting structure is used. It is an expansion perspective view of the push button attachment structure which shows the state where the power button was attached to the case. It is an expansion perspective view of the push button attachment structure which shows the state which removed the power button from the case. It is a perspective view of a power button. It is explanatory drawing explaining the attachment procedure of a power button, and the effect | action of a push button attachment structure. It is explanatory drawing explaining the attachment procedure of a power button, and the effect | action of a push button attachment structure. It is explanatory drawing explaining the attachment procedure of a power button, and the effect | action of a push button attachment structure. It is explanatory drawing explaining the attachment procedure of a power button, and the effect | action of a push button attachment structure. It is a perspective view of the power button which has a long hole-shaped fitting hole. It is explanatory drawing explaining the comparative example 1 in which the opening part was formed in the position which overlaps with the dividing line of an upper case and a lower case. It is explanatory drawing explaining the metal mold | die which makes a projection part stand in a plane part. It is explanatory drawing explaining the metal mold | die of the comparative example 2 which makes a protrusion stand in a side wall part.

  1 to 3, the push button mounting structure 10 of the present invention is used in, for example, a portable recording device 11 that is a small electronic device. In the portable recording device 11, a push button used for operation is provided on a case 12, and the push button mounting structure 10 is for attaching the push button. The push button is a button that is pressed. Examples of the push button include the operation button 17 shown in FIGS. 1 and 2 and the power button 22 shown in FIGS.

  An external microphone 13 for inputting sound can be attached to the portable recording device 11. The microphone 13 has, for example, a cylindrical shape, and has a microphone-side connector 13a connected to the portable recording device 11 at the rear end. The audio signal collected by the microphone 13 is output from the microphone-side connector 13a.

  The case 12 is a rectangular parallelepiped shape whose planar shape is a substantially rectangular shape, and the outer peripheral surface is composed of opposing upper and lower surfaces and four side surfaces orthogonal to the upper and lower surfaces. The case 12 is composed of two parts, an upper case 12a constituting the upper side and a lower case 12b constituting the lower side. The upper case 12a corresponds to the “first case” described in the claims, and the lower case 12b corresponds to the “second case” described in the claims.

  The upper case 12a is composed of four side wall portions 14 constituting the upper half of each of the four side surfaces and one flat portion 15 constituting the upper surface. The side wall part 14 is orthogonal to the plane part 15. Similar to the upper case 12 a, the lower case 12 b includes four side wall portions 14 and one flat surface portion 15, and the side wall portions 14 are orthogonal to the flat surface portion 15. In the lower case 12b, the flat portion 15 constitutes the lower surface. Each of the upper case 12a and the lower case 12b has a bottomed box shape in which an opening is formed.

  The upper case 12a and the lower case 12b are assembled with each other by, for example, screwing in a state where the openings are opposed to each other to assemble the case 12. In a state where the upper case 12a and the lower case 12b are assembled, a dividing line serving as a boundary between the upper case 12a and the lower case 12b is formed on the side surface of the case 12.

  A substrate 16 and the like are accommodated in the case 12. The substrate 16 is provided with a switch that is a circuit element that operates when a push button such as the operation button 17 or the power button 22 is pressed. 2 and 9, reference numeral 16 a is one of the switches, and is a switch that is activated by pressing the power button 22. The substrate 16 also includes a data storage device (not shown) such as an IC (Integrated Circuit) memory that records input sound, a main body side connector (not shown) to which the microphone side connector 13a is connected, and the like. Is provided.

  On the flat portion 15 of the upper case 12a, a plurality of operation buttons 17 used for operations such as recording, reproduction and volume adjustment, and various statuses such as status during recording or reproduction, recording time, volume, etc. An indicator 18 that performs display is provided. When the operation button 17 is pressed, a switch (not shown) corresponding to the operation button 17 is activated to enable recording, reproduction, volume adjustment, and the like.

  One of the side wall portions 14 of the upper case 12a is provided with a jack 19 that is an external output terminal for outputting an audio signal obtained by reproducing audio data recorded in the IC memory to the outside. The jack 19 is connected to a plug attached to one end of a cable such as a headphone cable.

  One of the side walls 14 of the lower case 12b has a slot 20 in which a memory card for recording audio data can be mounted, and a USB (Universal Serial Bus) connector 21 for transmitting the recorded audio data to the outside. Is provided. In addition, a power button 22 used to turn on / off the power is provided on one of the side walls 14 of the lower case 12b. When the power button 22 is pressed, the switch 16a corresponding to the power button 22 is actuated to switch the power on and off.

  Both the upper case 12a and the lower case 12b are resin molded products made of a plastic material. In this way, the bottomed box-shaped case having one flat portion 15 and the side wall portions 14 arranged orthogonally to the respective sides of the flat portion 15 and having an opening on one side has a concave cavity. In general, injection molding is performed using a cavity mold 60 having a convex shape and a core mold 61 having a convex core (see FIG. 12).

  Hereinafter, as an example of the push button mounting structure 10, a mounting structure for mounting the power button 22 to the lower case 12b will be described.

  As shown in FIGS. 2 to 5, the power button 22 has a pressing portion 28 and an L-shaped L-shaped arm portion 29. The power button 22 is, for example, a resin molded product made of a plastic material, and each part is integrally molded.

  An opening 25 for exposing the pressing portion 28 of the power button 22 to the outside of the lower case 12b is formed in the side wall portion 14 of the lower case 12b. The opening 25 has a shape corresponding to the outer shape of the pressing portion 28. In this example, the pressing portion 28 has an elliptical shape, and thus has an elliptical shape.

  A protrusion 26 for attaching the power button 22 is provided on the inner wall surface of the flat portion 15 of the lower case 12b. The protrusion 26 is erected. The protruding portion 26 has, for example, a cylindrical shape. The protruding portion 26 protrudes in a direction orthogonal to the pressing direction of the pressing portion 28.

  The pressing part 28 is inserted into the opening part 25. At the rear end of the pressing portion 28, a flange portion 30 that protrudes one step along the outer periphery of the pressing portion 28 is formed. The flange portion 30 is formed so that the outer periphery is larger than the opening portion 25, and restricts the movement of the pressing portion 28 in the insertion direction by contacting the outer edge portion of the opening portion 25.

  A protrusion 31 protruding rearward is provided at the center of the flange portion 30. The protrusion 31 is disposed at a position facing the switch 16a (see FIGS. 2 and 9), and when the power button 22 is pressed, the switch 16a is pressed to operate.

  The L-shaped arm portion 29 is formed in an L shape in accordance with two inner wall surfaces arranged orthogonally to each of the side wall portion 14 and the flat surface portion 15, and the side wall portion 14 constituting the side surface in the lower case 12 b. And it attaches to the intersection part vicinity of each inner wall surface of the plane part 15 which comprises a lower surface. The L-shaped arm portion 29 is composed of two arm portions, a first arm portion 33 and a second arm portion 34 that are orthogonal to each other.

  The first arm portion 33 has a pressing portion 28 formed at one end portion serving as a free end via a flange portion 30. In the attached state in which the power button 22 is attached to the respective inner wall surfaces of the side wall portion 14 and the flat surface portion 15, the first arm portion 33 extends parallel to the inner wall surface of the side wall portion 14 and the other end portion is the flat surface portion 15. Abuts against the inner wall surface.

  The first arm portion 33 is elastically deformed when the pressing portion 28 is pressed. Therefore, when the pressing portion 28 is pressed, the pressing portion 28 is moved rearward, and the switch 16 a is pressed by the protruding portion 31. Further, the first arm portion 33 has two columnar shapes in which the central portion is thinned along the longitudinal direction. Thereby, the 1st arm part 33 becomes easy to elastically deform.

  One end of the second arm portion 34 is connected to the other end portion of the first arm portion 33, and a fitting hole 36 that fits the protruding portion 26 is formed at the other end portion that is a free end. Yes. The fitting hole 36 is a cutout portion having a cutout shape in which the other end of the second arm portion 34 is a free end. In this cutout portion, the inner wall on one end side opposite to the free end has a shape corresponding to the outer shape of the protruding portion 26. In this example, the protruding portion 26 has a cylindrical shape, The shape is semicircular.

  The second arm portion 34 is elastically deformed when the fitting hole 36 is fitted to the protruding portion 26. As will be described in detail later, the power button 22 can be easily attached to the inner wall surface of the flat portion 15 by utilizing the elastic deformation of the second arm portion 34. The second arm portion 34 has a concave shape in which the upper surface and the lower surface extend in the longitudinal direction. That is, as for the 2nd arm part 34, the thickness of the center part is thin along the longitudinal direction. Thereby, the 2nd arm part 34 becomes easy to elastically deform.

  The second arm portion 34 is arranged in a state of extending in parallel with the inner wall surface of the flat portion 15 in the attached state. In the second arm portion 34, the length from the one end portion on the side wall portion 14 side to the fitting hole 36 is such that the one end portion of the second arm portion 34 and the inner wall surface of the side wall portion 14 are in contact with each other. The inner wall on the side wall portion 14 side of 36 has a length that makes contact with the outer peripheral surface of the protruding portion 26 (see length L in FIG. 9). The length L is determined according to the position of the protruding portion 26 from the inner wall surface of the side wall portion 14 in the lower case 12b.

  Since the length L is such, when the power button 22 is attached to the inner wall surface of the side wall portion 14 and the flat surface portion 15, one end portion and the side wall of the second arm portion 34 on the side wall portion 14 side. The inner wall surface of the portion 14 is in pressure contact, and the inner wall on the side wall portion 14 side of the fitting hole 36 and the protruding portion 26 are in pressure contact. Thereby, the power button 22 is fixed to the lower case 12b and positioning is performed without using another member for attaching the push button such as a screw. Since it is not necessary to use a separate member for attaching a push button such as a screw, it is possible to reduce labor and parts costs for assembly work.

  Next, the operation of the push button mounting structure 10 will be described while explaining the mounting procedure for mounting the power button 22 to the lower case 12b. As shown in FIG. 6, the pressing part 28 of the power button 22 is inserted into the opening 25 provided in the side wall part 14 of the lower case 12b. As shown in FIG. 7, when the upper surface of the pressing portion 28 and the flange portion 30 come into contact with the outer edge portion of the opening portion 25, the movement of the power button 22 in the insertion direction is restricted. Further, when the lower surface of the second arm portion 34 comes into contact with the upper surface of the protruding portion 26, the downward movement of the power button 22 is restricted. At this time, the one end part of the 2nd arm part 34 and the inner wall face of the side wall part 14 are spaced apart.

  As shown in FIG. 8, when the second arm portion 34 is pressed toward the side wall portion 14, since the downward movement of the second arm portion 34 is restricted by the protruding portion 26, the free end is warped. Elastically deforms in the direction. As a result, the second arm portion 34 can be further pushed toward the side wall portion 14.

  The length L from the one end portion of the second arm portion 34 to the fitting hole 36 is such that, in the attached state, one end portion on the side wall portion 14 side of the second arm portion 34 and the inner wall surface of the side wall portion 14 abut. The inner wall on the side wall 14 side of the fitting hole 36 has a length that makes contact with the protruding portion 26. When the fitting hole 36 is positioned above the protruding portion 26 by the above pushing, the protruding portion 26 can enter the fitting hole 36, and the restriction of the protruding portion 26 with respect to the downward movement of the second arm portion 34 is released. The For this reason, the second arm portion 34 moves downward while returning from the elastically deformed state to the original state, and the protruding portion 26 is fitted into the fitting hole 36 as shown in FIG. 9.

  Thereby, the power button 22 is fixed to the lower case 12b, and positioning is also performed. Since such fixing and positioning do not require a separate member for attaching a push button such as a screw, the power button 22 can be easily attached to the lower case 12b. As a result, it is possible to reduce labor and component costs for assembly work.

  In addition, when the power button 22 is attached to the lower case 12 b and the power button 22 is pressed and an external force is applied to the power button 22, the second arm portion 34 is connected to the inner wall surface of the side wall portion 14. Since it is in contact with the outer peripheral surface of the protruding portion 26, the power button 22 is prevented from being accidentally dropped off.

  Moreover, in the said embodiment, since the fitting hole 36 is a notch part of a notch shape, for example, the size of a fitting hole is comparable as the size of the protrusion part 26, and is circular like the protrusion part 26, for example. Compared to the case of the shape, the mounting is easy. This is because the fitting between the fitting hole 36 and the protruding portion 26 is, as shown in FIG. 8, from the state in which the free end of the second arm portion 34 is elastically deformed in the direction of warping, as shown in FIG. This is done in the process of returning to a linear state. For this reason, when the size and shape of the fitting hole and the protruding portion 26 are the same, the protruding portion 26 and the fitting hole interfere with each other, and the fitting is difficult. In the case of the fitting hole 36 of this example, since the hole shape is widened to the free end side due to the notch shape, and is larger than the size of the protruding portion 26, the protruding portion 26 and the fitting hole Since 36 does not interfere, it is easy to install.

  Further, the power button 22 may be provided with a long hole-shaped fitting hole 42 shown in FIG. 10 instead of the notch-shaped fitting hole 36 as in the above embodiment. The fitting hole 42 is a long hole extending in the longitudinal direction of the second arm portion 34. Even in the case of the elongated hole shape, a space for allowing the protruding portion 26 to escape backward in the longitudinal direction is secured in the fitting hole 42 when the protruding portion 26 is fitted. For this reason, the power button 22 can be easily attached because the protruding portion 26 and the fitting hole 42 do not interfere with each other in the same manner as in the above-described embodiment having the cutout shape.

  The push button mounting structure 10 of the present invention is particularly suitable when the opening 25 is formed at a position that does not overlap the dividing line between the upper case 12a and the lower case 12b, as shown in FIGS. It is valid. Hereinafter, the reason will be described while comparing with Comparative Example 1.

[Comparative Example 1]
The push button mounting structure of Comparative Example 1 is different from the above embodiment in the position where the opening is formed. As shown in FIG. 11, the upper case 50a and the lower case 50b are assembled in the upper case. An opening 51 is formed at a position overlapping the dividing line between 50a and lower case 50b. Specifically, a semicircular cutout 51a is formed at the lower end of the side wall 14 of the upper case 50a. A semicircular cutout 51b is formed at the upper end of the side wall portion 14 of the lower case 50b. In a state where the lower case 50b and the upper case 50a are assembled, the substantially elliptical opening formed by the notches 51a and 51b is the opening 51.

  Moreover, the push button of the comparative example 1 is, for example, a power button 52 that is used to turn on / off the power, and has substantially the same configuration as the power button 22 of the above embodiment. That is, the power button 52 has an L-shaped arm portion 54 and a pressing portion 28.

  The L-shaped arm portion 54 includes two arm portions, a first arm portion 55 and a second arm portion 56 that are orthogonal to each other. One end of the second arm portion 56 is connected to the other end portion of the first arm portion 55, and a fitting hole 57 that fits the protruding portion 26 is formed at the other end portion that is a free end. Yes. However, the second arm portion 56 of the power button 52 is not elastically deformed, and the fitting hole 57 has a circular shape, and the diameter is formed to be approximately equal to the diameter of the protruding portion 26. This is different from the second arm portion 34 of the power button 22.

  Thus, in the state where the opening 51 is formed at a position overlapping the dividing line of the upper case 50a and the lower case 50b, the upper case 50a can be assembled after the power button 52 is attached to the lower case 50b. The power button 52 can be easily attached in any manner.

  For example, in the power button 52, even when the second arm portion 56 in which the fitting hole 57 is formed is not elastically deformed, when the power button 52 is attached, the insertion of the pressing portion 28 into the opening 51 and the fitting hole 57 are performed. And the protrusion 26 can be simultaneously fitted. Even if the size and shape of the fitting hole 57 and the protruding portion 26 are the same, the fitting hole 57 can be fitted in parallel to the axial direction of the protruding portion 26. This is because, since the opening 51 is formed at a position overlapping the dividing line, the upper case 50a can be assembled after the power button 52 is attached to the lower case 50b. This is because the part 51 can be opened.

  On the other hand, in the above embodiment, the second arm portion 34 of the power button 22 can be elastically deformed even when the opening is formed at a position that does not overlap the dividing line between the upper case and the lower case. The power button 22 can be attached even when the pressing portion 28 is inserted into the opening 51. Thus, it can be said that the push button mounting structure 10 of the above embodiment is particularly effective when the opening 51 is present at a position that does not overlap with the dividing line of the upper case and the lower case. Further, if the fitting hole is notched or elongated as in the above embodiment, there is less interference when the second arm portion 34 is fitted to the protruding portion 26 while being elastically deformed. It is.

  Further, when the lower case 12b is a plastic molded resin product, as shown in FIG. 12, a cavity mold 60 having a concave cavity and a convex core are provided for injection molding. A core mold 61 is used. The cavity mold 60 and the core mold 61 are movable in the Y direction. A cylindrical recess 61 a is provided on the bottom surface of the core mold 61. As is well known, the lower case 12b is injection-molded by bringing the cavity mold 60 and the core mold 61 close to each other and injecting the resin made of a plastic material into the gap between the molds 60 and 61 in a molten state. . After forming, the cavity mold 60 and the core mold 61 are separated from each other, whereby the lower case 12 b is taken out from the respective molds 60 and 61. Thereby, the protrusion 26 is integrally formed on the inner wall surface of the flat portion 15 of the lower case 12 b at a position corresponding to the recess 61 a of the core mold 61.

[Comparative Example 2]
Hereinafter, a comparison between Comparative Example 2 in the case where the protruding portion 26 is provided on the side wall portion 14 as shown in FIG. 13 and the above-described embodiment in which the protruding portion 26 is provided on the flat portion 15 as shown in FIG. To do. In conclusion, as described below, compared to Comparative Example 2, it is better to form the lower case 12b by providing the projecting portion 26 on the flat surface portion 15 as in the above embodiment, and the power button. The fixing and positioning of 22 is also simplified.

  In the above embodiment, in the lower case 12b, the protruding portion 26 is provided on the inner wall surface of the flat surface portion 15, whereas in the comparative example 2, the protruding portion 26 is provided on the inner wall surface of the side wall portion 14. The point is different from the above embodiment. In the case of the comparative example 2, as shown in FIG. 13, a slide mold having a cavity mold 63 and a core mold 64 movable in the Y direction, and a slide structure movable in the X direction orthogonal to the Y direction. 65 is used. The slide mold 65 is for integrally forming the protruding portion 26 on the inner wall surface of the side wall portion 14.

  In order to integrally form the protruding portion 26 on the inner wall surface of the side wall portion 14, the slide die 65 is required in addition to the cavity die 63 and the core die 64, so that the die structure is complicated and the finishing accuracy is high. There is a problem that the deterioration and the yield are easily adversely affected, and the mold itself is expensive. On the other hand, in the above-described embodiment, the protrusion 26 can be integrally formed on the inner wall surface of the flat portion 15 by the cavity mold 63 and the core mold 64, so the above problem does not occur. Good formability.

  Furthermore, when the protrusion part 26 is provided in the side wall part 14 like the comparative example 2, the axial direction of the protrusion part 26 becomes parallel to the insertion direction of the pressing part 28 to the opening part 51. Therefore, in the case of the comparative example 2, when the power button 22 is pressed only by fitting the protruding portion 26 and the power button 22, the position of the power button 22 may be shifted or from the protruding portion 26. It will come off. Therefore, a separate fixing member is required to fix the power button 22. If the projecting portion 26 is provided on the flat surface portion 15 as in the above embodiment, the projecting portion 26 functions as a fixing member and a positioning member for the power button 22 because the axial direction of the projecting portion 26 is perpendicular to the pressing direction. To do. Therefore, fixing and positioning of the power button 22 are simplified.

  In the above embodiment, an example in which the power button 22 is attached has been described. However, the operation button 17 may be attached instead of the power button 22. Moreover, in the said embodiment, although the power button 22 is attached to the lower case 12b, it may replace with the lower case 12b and may be attached to the upper case 12a.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Push button attachment structure 11 Portable recording device 12 Case 12a Upper case 12b Lower case 14 Side wall part 15 Plane part 17 Operation button 22 Power button 25 Opening part 26 Projection part 28 Press part 29 L-shaped arm part 33 1st arm part 34 Second arm 36, 42 Mating hole

Claims (5)

In a case having a side wall portion and a flat surface portion arranged orthogonal to each other, a push button for attaching a push button having a pressing portion operated to be pressed from the outside of the case to the inner wall surface of the side wall portion and the flat surface portion. In the mounting structure,
The side wall portion has an opening that exposes the pressing portion to the outside,
The flat portion has a protruding portion erected on the inner wall surface,
The push button is
The pressing portion is formed at one end that is a free end, and is a first arm portion that is elastically deformed during the pressing operation of the pressing portion, and is attached to the inner wall surface of the side wall portion and the planar portion A first arm portion extending in parallel with the inner wall surface of the side wall portion and having the other end portion in contact with the inner wall surface of the planar portion;
One end portion is connected to the other end portion of the first arm portion, and the other end portion serving as a free end is formed with a fitting hole for fitting with the protruding portion, and is a second arm portion that is elastically deformed, In the attached state, having a second arm portion extending in parallel with the inner wall surface of the plane portion,
Furthermore, in the second arm portion, the length from the one end portion of the second arm portion to the fitting hole is determined so that the one end portion of the second arm portion and the inner wall surface of the side wall portion are in the attached state. A push button mounting structure in which the inner wall on the side wall portion side of the fitting hole that comes into contact with the projecting portion is in contact with the projecting portion.   The push button mounting structure according to claim 1, wherein the fitting hole formed in the other end portion of the second arm portion is a cutout portion formed in the other end portion.   The push button mounting structure according to claim 1, wherein the fitting hole formed in the other end portion of the second arm portion is a long hole formed in the other end portion.   The push button mounting structure according to any one of claims 1 to 3, wherein the case is a resin molded product. The case is composed of a combination of a first case and a second case,
The opening is formed in either the first case or the second case, and in the case, the opening is formed at a position that does not overlap a dividing line between the first case and the second case. Item 5. The push button mounting structure according to any one of Items 1 to 4.

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