Push button structure of an ultrasound diagnostic device

Abstract

To reduce a difference of a push feeling when mutually-different positions on a push button surface are pushed in a push button provided in an ultrasonic diagnostic device.SOLUTION: A push button structure 10 comprises: a substrate 12; a movable contact point member 14; a guide member 18; and a cap member 20 including an upper side cap member 34 and a lower side cap member 36. The movable contact point member 14 includes a base part 24, a protrusion 26 in which a movable contact point 30 is formed on the lower surface and an elastic member 28 which connects the base part 24 and the protrusion 26. The guide member 18 is cylindrical and is provided so as to surround a lateral side of the protrusion 26. The lower side cap member 36 covers the lateral side of the protrusion 26 and is located between a side wall of the protrusion 26 and the guide member 18. Concretely, the lower side cap member 36 is arranged close to and opposed to an inner side surface 18a so as to be slidable in a vertical direction along the inner side surface 18a of the guide member 18.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This specification discloses a push button structure of an ultrasonic diagnostic apparatus.

Background Art

[0002] Conventionally, an ultrasonic diagnostic apparatus that transmits and receives ultrasonic waves to and from a subject to perform ultrasonic diagnosis has been widely known. For example, as described in Patent Document 1, an ultrasonic diagnostic apparatus is provided with an operation panel for a user such as a doctor to input instructions to the ultrasonic diagnostic apparatus. A plurality of operation elements including push buttons are provided on the operation panel of the ultrasonic diagnostic apparatus.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the push button of the ultrasonic diagnostic apparatus, there has been a problem that when pressing different positions on the surface of the push button, the pressing feeling (feeling) is different from each other. This problem will be described together with the conventional push button structure while referring to FIGS. 5 to 9.

[0005] FIG. 5 is an exploded view of a push button structure 110 of an ultrasonic diagnostic apparatus according to a conventional example, and FIG. 6 is a vertical cross-sectional view of the push button structure 110. In FIGS. 5 and 6, the X-axis is in the horizontal direction and indicates the width direction of the ultrasonic diagnostic apparatus, the Y-axis is a horizontal direction perpendicular to the X-axis and indicates the depth direction of the ultrasonic diagnostic apparatus, and the Z-axis indicates the height direction (the positive direction of the Z-axis is the upper side).

[0006] The push button structure 110 comprises a circuit board 112, a movable contact member 114 provided above (outside) the circuit board 112, a housing 116 provided further above the movable contact member 114, and a cap member 118.

[0007] The substrate 112 is an electronic circuit board with a wire pattern, and a fixed contact 120 is provided on its upper surface.

[0008] The movable contact member 114 comprises a base 122, a convex portion 124 having a convex shape that protrudes upward, and an elastic member 126 connecting the base 122 and the convex portion 124. A movable contact (not shown) is formed on the lower surface of the convex portion 124. The elastic member 126 biases the convex portion 124 upward and is a member that holds the convex portion 124 such that, in its natural state, the movable contact of the convex portion 124 and the fixed contact 120 of the substrate 112 are separated. In the example of the push button structure 110, the elastic member 126 has a ring shape and, in the natural state shown in Figure 6, exhibits a skirt shape that slopes downward toward the outside. The inner end of the ring-shaped elastic member 126 (which becomes the upper end in the natural state) is connected to the side wall of the convex portion 124 (which becomes the lower end of the side wall in the example of the push button structure 110), and the outer end of the elastic member 126 (which becomes the lower end in the natural state) is connected to the base 122.

[0009] The housing 116 is a component that makes up the outer surface of the ultrasound diagnostic device (more specifically, the control panel). The housing 116 is provided with a button hole 128 through which the cap member 118 is inserted.

[0010] The cap member 118 is composed of a top plate 118a that extends horizontally and a side wall 118b that protrudes downward from the end of the top plate 118a. The cap member 118 is attached to the protrusion 124 so as to cover the top surface and a portion of the side surface of the protrusion 124.

[0011] When the top plate 118a of the cap member 118 is pushed downward by the user, the elastic member 126 elastically deforms accordingly, causing the protrusion 124 to also be pushed downward. Then, the operation of the push button is detected when the movable contact and the fixed contact 120 provided on the lower surface of the protrusion 124 come into contact.

[0012] Here, we will explain the feel of pressing a push button. Figure 7 is a diagram of the feeling curve. In the graph shown in Figure 7, the horizontal axis represents the stroke of the protrusion 124 (the vertical position of the protrusion 124), and the vertical axis represents the load applied to the protrusion 124. The load can also be seen as the magnitude of the reaction force of the elastic member 126 to the pressing force on the protrusion 124. A graph that shows the relationship between the stroke of a push button and the load in this way is called a feeling curve.

[0013] In its natural state, the elastic member 126 exhibits the aforementioned skirt shape, and therefore, the load increases in proportion to the amount of pressure applied to the protrusion 124 during the stroke from 0 to S1. At stroke S1, the elastic member 126, which was in a skirt shape, takes on a horizontally extended position (a ring shape parallel to the horizontal direction). Thereafter, the reaction force of the elastic member 126 decreases, and the load decreases in proportion to the amount of pressure applied to the protrusion 124 during the stroke from S1 to S2. At stroke S2, the movable contact comes into contact with the fixed contact 120, and thereafter (stroke S2 ​​to S3), the protrusion 124 moves due to the elastic deformation of the elastic member 126, causing the load to increase. When the user stops pressing on the protrusion 124, the upward biasing force of the elastic member 126 returns the stroke of the protrusion 124 to 0.

[0014] Here, if we define load A as the load during stroke S1 (the maximum load required to activate the push button) and load C as the load during stroke S2 ​​(the load when the push button is activated), then conventionally, the click rate is calculated using the following formula. {(AC) / A} × 100[%]

[0015] The click rate is an indicator that represents the tactile sensation a user feels when pressing a push button. Therefore, if the click rates differ when pressing different locations on the push button surface, it means that the tactile sensation differs when pressing different locations on the push button surface. For example, Figure 8 shows the feeling curve when a user presses the center of the top plate 118a of the cap member 118 in a plan view, and Figure 9 shows the feeling curve when a user presses the edge of the top plate 118a in a plan view. The feeling curve shown in Figure 8 represents the normal tactile sensation (the tactile sensation intended by the push button designer), but the feeling curve shown in Figure 9 does not represent the normal tactile sensation. The click rates obtained from both feeling curves are clearly different, so in such cases, the user will feel that the tactile sensation of the push button differs from one another.

[0016] One of the factors that causes the feeling curve to be as shown in Figure 9 is that the movable part of the push button (the protrusion 124 in the push button structure 110) does not move straight up and down. For example, in Figure 6, when the user presses the right side of the top plate 118a, first only the right elastic member 126 deforms, causing the protrusion 124 to tilt downwards to the right. Then, when the user presses the protrusion 124 further, the left elastic member 126 deforms after the right elastic member 126, and the posture (tilt) of the protrusion 124 changes again. This tilt of the protrusion 124 can result in an irregular feeling curve as shown in Figure 9.

[0017] Furthermore, the gap 130 between the side wall 118b of the cap member 118 and the inner wall of the button hole 128 allows for the tilting of the protrusion 124. It is conceivable that the tilting of the protrusion 124 could be suppressed by narrowing the gap 130. However, in ultrasound diagnostic equipment, there is a possibility that foreign matter such as dust or echo gel may enter the gap 130 and become fixed, hindering the vertical movement of the cap member 118, i.e., the protrusion 124. In order to suppress the occurrence of this problem, it is necessary to maintain the gap 130 at a width of a certain magnitude or greater, and therefore it is not easy to simply narrow the gap 130.

[0018] Furthermore, users of ultrasound diagnostic equipment sometimes hold the ultrasound probe in one hand, view the ultrasound image displayed on the screen, and operate the push buttons with the other hand. In such cases, it is often difficult to accurately press the center of the push button, and therefore the above problem can be particularly evident in ultrasound diagnostic equipment.

[0019] Furthermore, as shown in Figures 5 and 6, if the protrusion 124 has an elongated shape that extends in one direction in a plan view, variations in the pressing sensation depending on the pressing position are particularly likely to occur.

[0020] The purpose of the push-button structure for an ultrasound diagnostic device disclosed herein is to reduce the difference in feel when pressing different positions on the surface of a push-button provided in an ultrasound diagnostic device. [Means for solving the problem]

[0021] The push button structure of the ultrasonic diagnostic apparatus disclosed in this specification includes a substrate provided with fixed contacts, and a movable contact member provided above the substrate. The movable contact member has a base portion, a convex portion protruding upward and having a convex shape, and a movable contact formed on the lower surface thereof to contact the fixed contacts. The elastic member connects the base portion and the convex portion, and in a natural state, biases the convex portion upward to hold the convex portion so that the movable contact and the fixed contact are separated. When the convex portion is pushed downward, the elastic member is such that the magnitude of the reaction force upward changes according to the amount of pushing. The movable contact member further includes a cylindrical guide member provided so as to surround the side of the convex portion, a top plate covering the upper surface of the convex portion, and a side wall covering the side surface of the convex portion, and a cap member attached to the convex portion. The side wall is arranged so as to be slidable in the vertical direction along the inner surface of the guide member and to be close to and opposed to the inner surface.

[0022] According to this configuration, when the side wall of the cap member abuts against the guide member, the inclination of the convex portion is suppressed. That is, it can move in the vertical direction while suppressing the inclination of the convex portion. As a result, no matter which position on the top plate of the cap member the user presses, a substantially normal feeling curve can be obtained. That is, the difference in the pressing feeling when pressing different positions on the surface of the push button is reduced.

[0023] The side wall of the cap member preferably protrudes outward above the upper end of the guide member and has a flange that covers the upper part of the gap between the side wall of the cap member and the inner surface of the guide member.

[0024] According to this configuration, it is possible to prevent foreign substances such as dust and echo jelly from entering the gap between the side wall of the cap member and the inner surface of the guide member.

[0025] The flange preferably extends above the outer end of the guide member.

[0026] According to this configuration, it is further suppressed that foreign matter enters the gap between the side wall of the cap member and the inner surface of the guide member.

[0027] Further provided is a housing provided above the movable contact member and having a button hole through which the cap member is inserted. The cap member includes an upper cap member including the top plate and inserted through the button hole, and a lower cap member disposed below the housing and having the flange, and is configured to include the cap member. It is preferable that the upper cap member and the lower cap member are detachable.

[0028] According to this configuration, when sandwiching a sheet with characters or the like between the top plate of the cap member and the convex portion, the sheet can be easily replaced.

[0029] The convex portion is preferably in an elongated shape extending in one direction in a plan view.

[0030] [[ID=十五]] According to this configuration, when the shape of the convex portion is an elongated shape in which the pressing feeling tends to vary depending on the pressing position, it is possible to reduce the difference in the pressing feeling when pressing different positions on the surface of the push button.

Effect of the Invention

[0031] According to the ultrasonic time-series data processing device disclosed in this specification, in the push button provided in the ultrasonic diagnostic device, it is possible to reduce the difference in the pressing feeling when pressing different positions on the surface of the push button.

Brief Description of the Drawings

[0032] [Figure 1] It is an exploded view of the push button structure according to this embodiment. [Figure 2] It is a perspective cross-sectional view of the push button structure according to this embodiment. [Figure 3] It is a vertical cross-sectional view of the push button structure according to this embodiment. [Figure 4] It is a bottom view of the movable contact member. [Figure 5] This is an exploded view of a conventional push-button structure. [Figure 6] This is a vertical cross-sectional view of a conventional push-button structure. [Figure 7] This is a diagram showing the feeling curve. [Figure 8] This is the feeling curve when a user presses the center of the top plate of the cap member in a plan view, in a conventional push-button structure. [Figure 9] This is the feeling curve when a user presses the edge of the top plate of the cap member in a plan view, in a conventional push-button structure. [Modes for carrying out the invention]

[0033] Figure 1 is an exploded view of the push-button structure 10 according to this embodiment, Figure 2 is a perspective cross-sectional view of the push-button structure 10, Figure 3 is a vertical cross-sectional view of the push-button structure 10, and Figure 4 is a bottom view of the movable contact member 14. In Figures 1 to 4, the X-axis is the horizontal direction and indicates the width direction of the ultrasound diagnostic device, the Y-axis is the horizontal direction perpendicular to the X-axis and indicates the depth direction of the ultrasound diagnostic device, and the Z-axis indicates the height direction (the positive Z-axis direction is upward).

[0034] The push button structure 10 comprises a circuit board 12, a movable contact member 14, a housing 16, a guide member 18, and a cap member 20.

[0035] The substrate 12 is an electronic circuit board with a wire pattern, and fixed contacts 22 are provided on its upper surface.

[0036] The movable contact member 14 is provided above (outside) the substrate 12. The movable contact member 14 is composed of a base portion 24, a convex portion 26 having a convex shape that protrudes upward, and an elastic member 28 that connects the base portion 24 and the convex portion 26.

[0037] In this embodiment, the base portion 24 has a sheet shape that extends parallel to the substrate 12, but the shape of the base portion 24 is not limited to this.

[0038] The protrusion 26 has a convex shape that projects upward. In this embodiment, the protrusion 26 projects upward from the sheet-shaped base 24. Also in this embodiment, the protrusion 26 has an elongated shape that is extended in the X-axis direction when viewed from above. Specifically, the protrusion 26 has an elliptical shape that is extended in the X-axis direction when viewed from above. As shown in Figures 2 and 3, the protrusion 26 is hollow and open downwards. A bulge 26a that projects laterally is formed in approximately the lower half of the side wall of the protrusion 26. Also, as shown in Figure 4, a movable contact 30 is formed on the lower surface of the protrusion 26. In this embodiment, a plurality (four) of movable contacts 30 are formed.

[0039] The elastic member 28 is elastic and biases the protrusion 26 upward with its elastic force, holding the protrusion 26 such that the movable contact 30 of the protrusion 26 and the fixed contact 22 of the substrate 12 are separated in the natural state. In this embodiment, the entire movable contact member 14 is made of a resin such as rubber, and the entire movable contact member 14 is elastic. However, it is sufficient that at least the elastic member 28 is elastic. In this embodiment, the elastic member 28 has a ring shape and, in the natural state shown in Figures 2 and 3, exhibits a skirt shape that slopes downward toward the outside. The inner end of the ring-shaped elastic member 28 (which is the upper end in the natural state) is connected to the side wall of the protrusion 26 (which is the lower end of the bulge 26a in this embodiment), and the outer end of the elastic member 28 (which is the lower end in the natural state) is connected to the base 24.

[0040] The housing 16 is provided above the movable contact member 14 and is a component that constitutes the outer surface of the ultrasonic diagnostic device (more specifically, the control panel). The housing 16 is made of resin or the like. The housing 16 has a protrusion 26 and a button hole 32 through which the cap member 20 (particularly the upper cap member 34 described later) is inserted.

[0041] The guide member 18 is cylindrical and is provided so as to surround the sides of the protrusion 26. The guide member 18 is made of resin or the like. In this embodiment, the guide member 18 is made of POM (PolyOxyMethylene resin). POM has the characteristics of having a low coefficient of friction (easy to slide), excellent friction resistance, and high fatigue resistance. As described above, in this embodiment, the protrusion 26 is an elliptical shape that extends in the X-axis direction in a plan view, so the guide member 18 also has an elliptical shape in its outer shape and inner hole in a plan view accordingly.

[0042] The guide member 18 is positioned around the protrusion 26 from above when the housing 16 is removed. When the housing 16 is attached in this state, the guide member 18 is held by the housing 16, sandwiched between the base 24 of the movable contact member 14 and the housing 16. Specifically, the guide member 18 is held by a claw (not shown) provided on the lower surface of the housing 16 engaging with a claw receiver 18b (see Figure 1) provided on the guide member 18. In this way, the guide member 18 is detachable from the protrusion 26.

[0043] The cap member 20 is a member attached to the protrusion 26 so as to cover at least a portion of the upper surface and side surface of the protrusion 26. The cap member 20 is made of a resin such as polycarbonate. In this embodiment, the cap member 20 consists of an upper cap member 34 and a lower cap member 36. The upper cap member 34 and the lower cap member 36 are detachably connected. Note that the cap member 20 does not necessarily have to be divided into an upper cap member 34 and a lower cap member 36.

[0044] The upper cap member 34 has a top plate 34a that extends horizontally and covers the upper surface of the protrusion 26, and a side wall 34b that protrudes downward from the end of the top plate 34a. The upper surface of the top plate 34a becomes the pressing surface that the user presses. The upper cap member 34 is inserted into the button hole 32 together with the protrusion 26.

[0045] The lower cap member 36 has a generally cylindrical shape. In a plan view, the lower cap member 36 has a shape that corresponds to the shape of the inner hole of the guide member 18. As described above, in this embodiment, the inner hole of the guide member 18 is elliptical in a plan view, so the outer shape of the lower cap member 36 is elliptical in a plan view accordingly.

[0046] The lower cap member 36 is detachably connected to the lower end of the side wall 34b of the upper cap member 34. In this embodiment, the lower cap member 36 is positioned below the lower end of the housing 16. That is, the lower cap member 36 is not inserted through the button hole 32.

[0047] The lower cap member 36 has an inner projection 36a on the upper side of its inner surface that protrudes inward. The inner projection 36a is provided along the entire circumference or a part of the circumference. The lower surface of the inner projection 36a abuts against the upper surface of the bulging portion 26a of the convex portion 26. In this way, the lower cap member 36 is provided in contact with the side wall of the convex portion 26. As shown in Figures 2 and 3, in this embodiment, almost the entire side surface of the convex portion 26 is covered by the side wall 34b of the upper cap member 34 and the lower cap member 36. In this way, the side wall 34b of the upper cap member 34 and the entire lower cap member 36 form the side wall of the cap member 20 as a whole.

[0048] In the mounting state in which the cap member 20 is attached to the protrusion 26, the lower cap member 36 is positioned between the side wall of the protrusion 26 and the guide member 18. Specifically, the lower cap member 36 is positioned close to and facing the inner surface 18a of the guide member 18 so as to be slidable in the vertical direction along the inner surface 18a of the guide member 18.

[0049] The lower cap member 36 has a flange 36b that protrudes outward above the upper end of the guide member 18. The flange 36b covers the upper part of the gap 40 between the lower cap member 36 and the inner surface 18a of the guide member 18. The upper surface of the flange 36b abuts against the lower surface of the housing 16, in particular, against the edge of the button hole 32. As a result, the lower cap member 36 does not pass through the button hole 32 and does not move above the lower end of the housing 16.

[0050] In particular, as shown in Figure 3, it is preferable that the flange 36b extends outward to or beyond the outer end of the guide member 18.

[0051] The push-button structure 10 according to this embodiment is as described above. The operation of the push-button structure 10 and the function of each part will be described below.

[0052] Similar to the conventional push-button structure 110, when the top plate 34a of the upper cap member 34 is pushed downward by the user, the elastic member 28 elastically deforms accordingly, causing the protrusion 26 to also be pushed downward. Then, the operation of the push-button is detected when the movable contact 30 provided on the lower surface of the protrusion 26 and the fixed contact 22 provided on the substrate 12 come into contact.

[0053] The feeling curve for the push-button structure 10 is similar to that shown in Figure 7. That is, in its natural state, the elastic member 28 has a skirt shape, so the load increases in proportion to the amount the protrusion 26 is pressed in during the stroke from 0 to S1. At stroke S1, the elastic member 28, which was in a skirt shape, takes on a horizontally extended position (a ring shape parallel to the horizontal direction). After that, the reaction force of the elastic member 28 decreases, so the load decreases in proportion to the amount the protrusion 26 is pressed in during the stroke from S1 to S2. In this way, the elastic member 28 changes the magnitude of its upward reaction force in proportion to the amount the protrusion 26 is pressed downward. Specifically, the magnitude of the reaction force is different between the stroke from 0 to S1 and between the stroke from S1 to S2. This gives the user a click sensation. During stroke S2, the movable contact 30 comes into contact with the fixed contact 22, and thereafter (stroke S2 ​​to S3), the protrusion 26 moves due to the elastic deformation of the elastic member 28, thus increasing the load. When the user stops pushing against the protrusion 26, the upward biasing force of the elastic member 28 returns the stroke of the protrusion 26 to zero.

[0054] In the push-button structure 10, a guide member 18 is provided immediately to the side of the outer surface of the lower cap member 36. Therefore, even if the user presses the edge of the top plate 34a in a plan view, the lower cap member 36 will come into contact with the guide member 18, suppressing the tilt of the protrusion 26. In other words, the protrusion 26 can move vertically while its tilt is suppressed. As a result, regardless of where the user presses on the top plate 34a, a generally normal feeling curve (see Figure 7 or Figure 8) can be obtained. That is, the difference in the feel of pressing when pressing different positions on the push-button surface is reduced.

[0055] In particular, in this embodiment, since the guide member 18 is made of POM, its coefficient of friction is small. Therefore, even when the lower cap member 36 comes into contact with the guide member 18, the protrusion 26 can move smoothly in the vertical direction.

[0056] The gap 40 between the lower cap member 36 and the inner surface 18a of the guide member 18 is set to be considerably narrow from the viewpoint of suppressing the tilting of the protrusion 26. It is set to be at least narrower than the gap 130 (see Figure 6) between the side wall 118b of the cap member 118 and the inner wall of the button hole 128 in the conventional push button structure 110. Therefore, if foreign matter such as dust or echo gel enters the gap 40, it may become stuck, potentially hindering the vertical movement of the lower cap member 36, i.e., the protrusion 26.

[0057] In view of this, in this embodiment, a flange 36b is provided to cover the upper part of the gap 40. Therefore, even if foreign matter enters the gap 42 between the side wall 34b of the upper cap member 34 and the inner wall of the button hole 32, the flange 36b prevents the foreign matter from entering the gap 40. If the flange 36b extends above the outer end of the guide member 18, the foreign matter entering the gap 40 is further suppressed. This prevents the foreign matter from hindering the vertical movement of the protrusion 26. The gap 42 may be the same width as the gap 130 of the conventional push button structure 110.

[0058] Furthermore, the top plate 34a of the upper cap member 34 can be made transparent, and a sheet (not shown) with characters (characters indicating the function of the push button, etc.) printed on it can be inserted between the top plate 34a and the protrusion 26. For example, this sheet can be replaced in accordance with changes in the function of the push button. If the cap member 20 were a single component (not divided into an upper cap member 34 and a lower cap member 36) and the cap member 20 had a flange 36b, then in order to remove the cap member 20 in order to replace the sheet, the housing 16 would also have to be removed.

[0059] In this embodiment, the cap member 20 is composed of an upper cap member 34 and a lower cap member 36 having a flange 36b, and the upper cap member 34 and the lower cap member 36 are detachable. Therefore, when replacing the sheet, it is not necessary to remove the housing 16, but the upper cap member 34 can be removed from the lower cap member 36. In other words, in this embodiment, the sheet can be easily replaced.

[0060] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the invention. [Explanation of Symbols]

[0061] 10 Push button structure, 12 Circuit board, 14 Movable contact member, 16 Housing, 18 Guide member, 18a Inner surface, 18b Claw receiver, 20 Cap member, 22 Fixed contact, 24 Base, 26 Protrusion, 26a Bulging part, 28 Elastic member, 30 Movable contact, 32 Button hole, 34 Upper cap member, 34a Top plate, 34b Side wall, 36 Lower cap member, 36a Inner protrusion, 36b Flange, 40, 42 Gap.

Claims

1. A circuit board with fixed contacts, A movable contact member provided above the substrate, comprising: a base; a protrusion having a convex shape projecting upward and having a movable contact formed on its lower surface that contacts the fixed contact; and an elastic member connecting the base and the protrusion, which, in its natural state, biases the protrusion upward to hold the protrusion so that the movable contact and the fixed contact are separated, and when the protrusion is pushed downward, the magnitude of the upward reaction force changes according to the amount of push; A cylindrical guide member is provided so as to surround the side of the aforementioned protrusion, A cap member having a top plate that covers the upper surface of the protrusion and a side wall that covers the side surface of the protrusion, which is attached to the protrusion, Equipped with, The side wall is positioned close to and opposite the inner surface so as to be slidable vertically along the inner surface of the guide member, The side wall of the cap member protrudes outward above the upper end of the guide member and has a flange that covers the gap between the side wall of the cap member and the inner surface of the guide member. A push-button structure for an ultrasound diagnostic device characterized by the following features.

2. The flange extends above the outer end of the guide member. The push-button structure of the ultrasound diagnostic apparatus according to feature 1.

3. A housing provided above the movable contact member and having a button hole through which the cap member is inserted, Furthermore, The aforementioned cap member is The system comprises an upper cap member that includes the top plate and is inserted through the button hole, and a lower cap member and cap member that are positioned below the housing and have the flange. The upper cap member and the lower cap member are detachable. The push-button structure for an ultrasonic diagnostic apparatus according to claim 1 or 2.

4. The aforementioned protrusion has an elongated shape that extends in one direction when viewed from above. The push-button structure of the ultrasound diagnostic apparatus according to feature 1.

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