JP2004055188A - Key switch and electronic apparatus equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key switch allowing a plurality of switches to be pressed at the same time and preventing an erroneous key pressing operation. <P>SOLUTION: This electronic apparatus is provided with n-pieces of switches 6, an operation key 2 having a back face touching the switches, an operation face serving as a front face, and an outer circumferential side face put between the operation face and the back face, n-pieces of projections 9 formed in association with the switches 6 and protruded outward respectively, and a case member 1 having a window for installing the operation key. In the operation key, an ordinary pressing operation can be carried out for pressing the operation face above the switch while using a contact point with the switch 6 adjacent to a pressing part as a fulcrum, and a diagonal pressing operation can be carried out for pressing the operation face excepting a part above the switch. In the window 1a of the case member 1, the end face facing the projections of the operation key is provided with recessed curved faces 10 which are not brought into contact with the projections in the ordinary pressing operation of the operation key and brought into contact with the projections in the diagonally pressing operation of the operation key. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a key switch having an operation key capable of pressing a plurality of switches one by one or a plurality of switches at the same time, and an electronic apparatus including the key switch.
[0002]
[Prior art]
FIG. 8 is a front view (FIG. 8A) and a side view (FIG. 8B) showing a conventional key switch. In the figure, reference numeral 31 denotes a housing (partially shown) serving as a case member, and 31a denotes a window for the operation keys 32 provided on the housing 31. The operation key 32 is a disk-shaped key including an operation surface, which is a front surface, a back surface, and an outer peripheral side surface. The operation key 32 can be pressed between the end surface of the window 31 a and the outer peripheral side surface of the operation key 32. A gap is provided. Reference numeral 35 denotes a board built in the housing 1, and 36a, 36b, 36c, and 36d denote switches mounted on the board 35. The four switches 36a, 36b, 36c, 36d are mounted at equal intervals on a circle centered on a point on the board overlapping the center of the operation key 32. Reference numeral 37 denotes a sheet provided on the back surface of the operation keys 32. The sheet 37 has projections 37a, 37b, 37c, and 37d at portions in contact with the four switches 36a, 36b, 36c, and 36d. Reference numerals 38a, 38b, 38c, and 38d denote protrusions formed on the outer peripheral side surface of the operation key 32 so as to protrude outward, and are provided corresponding to the switches 36a, 36b, 36c, and 36d. Further, on the substrate 35, a switch detection unit (not shown) that is connected to the switches 36a to 36d and detects pressing of one switch or simultaneous pressing of two adjacent switches, that is, pressing of eight patterns is provided. Have been.
[0003]
Next, the operation will be described. The operator presses the operation surface of the operation key 32 to perform any one of the eight patterns. For example, when the operation surface on the switch 36d is pressed (normally pressed), the operation key 32 is pressed down on the switch 36d and raised on the switch 36c, using the point contacting the switch 36a and the point contacting the switch 36b as a fulcrum. Lean like so. Then, the switch 36d is pressed by the protrusion 37d, and the switch detection unit detects that the switch 63d is pressed.
[0004]
Here, it is assumed that the operator presses a portion of the operation key 32 between the switch 36a and the switch 36c in order to select a pattern to be executed by simultaneously pressing the switches 36a and 36c. At this time, when the intermediate point on the switch 36a and the switch 36c is pressed exactly (diagonally pressed 1), the operation key 32 is pressed down with the point contacted with the switch 36a and the point contacted with 36c as a fulcrum. The switch 36b is tilted so that an intermediate portion on the switch 36b and the switch 36d is pushed up. When further pressed, the projections 38b and 38d on the outer peripheral side surface of the operation key 32 come into contact with the housing 31, so that a force in the switch pressing direction is applied to the operation key 32, and the switches 36a and 36c serving as fulcrums respectively become the projections 37a. , 37c. Then, the switch detector detects simultaneous depression of the switches 36a and 36c.
[0005]
On the other hand, when the operator presses the operation surface on the switch 36a side from the intermediate point on the switch 36a and the switch 36c (diagonally depressed 2), the operation key 32 uses the point contacting the switch 36a and the point contacting the switch 36c as fulcrums. The pushed portion is pushed down, and the middle portion on the switch 36b and the switch 36d is tilted so as to be pushed up. At this time, a force in the pressing direction stronger than 36c is applied to the switch 36a serving as the fulcrum, but the switch is not turned on. When further pressed, the protrusions 38b and 38d on the outer peripheral side come into contact with the housing 31, the contact load is dispersed, and a uniform force in the switch pressing direction is applied to the protrusions 38d and the protrusions 38b. As a result, a state similar to the above-described oblique pressing 1 is obtained, and the switches 36a and 36c are uniformly pressed by the protrusions 37a and 37c, respectively, and the switch detecting unit detects the simultaneous pressing.
[0006]
[Problems to be solved by the invention]
As described above, in the conventional key switch, the projections 38a to 38d are provided on the outer peripheral side surface of the operation key 32, and these are configured to be in contact with the housing 31, so that the intermediate switch between the two switches to be simultaneously pressed is provided. Even when an operation surface other than a point is pressed (the above-described oblique pressing 2), simultaneous pressing of two switches can be detected.
[0007]
However, in order to realize the above operation, it is necessary to dispose the protrusion 38 and the housing 31 in close proximity. FIG. 9 shows a front view (FIG. 9 (a)) and a side view (FIG. 9 (b)) when a part of the housing 31 is pressed by the same conventional key switch as FIG. As shown in the figure, when the surface portion 39 of the housing 31 overlapping the projection 38 is pressed, the housing 31 and the projection 38 come into contact with each other, and the projection 38 is pressed, whereby the operation key 32 is pressed and the switch erroneously is pressed. There is a problem that the button 36a is pressed.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a first object is to obtain a key switch capable of simultaneously pressing a plurality of switches and hardly pressing the switches accidentally. .
[0009]
A second object of the present invention is to provide an electronic device which can easily detect pressing of one switch and simultaneous pressing of a plurality of switches, and in which it is difficult to detect switch pressing by mistake.
[0010]
[Means for Solving the Problems]
A key switch according to the invention of claim 1, wherein n (n is an even number greater than or equal to 4) switches are arranged such that each point is point-symmetric with respect to one of the other points, and a back surface that contacts this switch. An operation surface serving as a front surface, an outer peripheral side face sandwiched between the operation surface and the back surface, and other than normal pressing and pressing on the operation surface on the switch with a contact point between the operation surface and the switch adjacent to the pressing portion as a fulcrum. An operation key provided to be able to be pressed obliquely to press the operation surface of the operation key, n projections formed on the outer peripheral side surface of the operation key so as to respectively protrude outward corresponding to the switch, and the operation key A case member having a window provided is provided, and an end face of the window of the case member facing the projection of the operation key does not contact the projection when the operation key is normally pressed, and when the operation key is obliquely pressed. To Projecting and has a concave surface in contact with the raised portion.
[0011]
A key switch according to a second aspect of the present invention is the key switch according to the first aspect, wherein the protrusion has a convex curved surface having the same curvature as a concave curved surface of the case member.
[0012]
A key switch according to a third aspect of the present invention is the key switch according to the first aspect, wherein the projection has a dome shape.
[0013]
In the electronic device according to the present invention, n switches (n is an even number of 4 or more) are arranged so that each point is point-symmetric with respect to any other, and the switches are in contact with each other. A normal press and a switch having a back surface, an operation surface serving as a front surface, an outer peripheral side face sandwiched between the operation surface and the back surface, and pressing an operation surface on the switch using a contact point between the switch and the switch adjacent to the press portion as a fulcrum. An operation key provided to be capable of being pressed obliquely to press an operation surface other than the top, n projections formed on the outer peripheral side surface of the operation key so as to respectively protrude outward corresponding to the switches, A switch detection unit connected to each of the switches for detecting one press of the switch and two simultaneous presses of the switch, and displaying information on one press of the switch and two simultaneous presses of the switch Table And a housing having a display window for providing the display unit and an operation key window for providing the operation keys, and an end face of the operation key window opposed to the projection of the operation key is provided with the operation key. It has a concave curved surface that does not touch the projection when pressed normally and contacts the projection when obliquely pressed with the operation key.
[0014]
An electronic device according to a fifth aspect of the present invention is the electronic device according to the fourth aspect, wherein the protrusion has a convex curved surface having the same curvature as the concave curved surface.
[0015]
Furthermore, an electronic device according to a sixth aspect of the present invention is the electronic device according to the fourth aspect, wherein the protrusion has a dome shape.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a mobile phone which is an electronic device provided with a key switch according to the present invention. In the figure, reference numeral 1 denotes a housing (case member) of a mobile phone, which is provided with a window for providing an operation key 2, a display unit 3, and an operation button 4. The operation key 2 is a disk-shaped key including an operation surface, which is a front surface, a back surface, and an outer peripheral side surface. The operation key 2 is not fixed to a window of the housing 1 and is provided so that the operation surface can be pressed. The display unit 3 displays information related to the operation of the operation keys 2 and information corresponding to the operation results of the operation keys 2 and the operation buttons 4. The operation buttons 4 include ten keys, function keys, and the like, and are used to input telephone numbers and the like.
[0017]
FIG. 2 is an exploded perspective view showing the key switch structure according to the present invention built in the housing 1. In FIG. 2, reference numeral 5 denotes a board, and 6 denotes a switch mounted on the board 5. The switch 6 includes a dome plate 18 that is crushed by a force in a pressing direction equal to or greater than a predetermined value, and a switch pattern (not shown) on a substrate that is turned on when the dome plate 18 is crushed. The four switches 6 are mounted at equal intervals on a circle centered on a point on the board overlapping the center of the operation key 2. Reference numeral 7 denotes a sheet provided on the back surface of the operation keys 2, and includes four protrusions 7 a, 7 b, 7 c, and 7 d at portions contacting the four switches 6. By fixing a part of the sheet 7 inside the housing 1, the operation keys 2 are operably provided on the housing 1. The sheet 7 may be attached to the back surface of the operation key 2 or may be formed integrally with the operation key 2. Also, on the substrate 5, a switch detecting unit connected to each switch 6 and detecting pressing of one switch (switch on) or simultaneous pressing of two adjacent switches (switch on), that is, pressing of eight patterns. (Not shown) is provided.
[0018]
FIGS. 3A and 3B show the operation keys 2 mounted on the housing 1 and the periphery thereof. FIG. 3A is a front view, and FIG. 3B is a side view along AA ′. 1 and 2 indicate the same configuration. In the figure, reference numeral 1a denotes a window for an operation key 2 provided in a housing 1, and a gap is provided between an end face of the window 1a and an outer peripheral side surface of the operation key 2 so that the operation key 2 can be pressed. Have been. Reference numerals 6a, 6b, 6c, and 6d denote the respective switches 6, and the sheet 7 is provided with projections 7a, 7b, 7c, and 7d corresponding thereto. 8a, 8b, 8c, and 8d are eaves formed to protrude outward on the outer peripheral side surface of the operation key 2, and are provided at positions corresponding to the switches 6a, 6b, 6c, and 6d. Protrusions 9a, 9b, 9c, 9d having curved surfaces are provided on the eaves 8a to 8d, respectively. In addition, concave surfaces 10a, 10b, 10c, and 10d having the same curvature as the curved surfaces of the projections 9a to 9d are formed on the end surface of the window 1a of the housing 1 at positions corresponding to the projections 9a to 9d, respectively. Reference numeral 11 denotes a coordinate axis corresponding to the front view, and reference numeral 12 denotes a coordinate axis corresponding to the side view along AA '.
[0019]
As shown by the coordinate axes 11 and 12, when the direction from the switches 6c to 6d is the + x direction, the direction from the switches 6b to 6a is the + y direction, and the pressing direction of the switch 6 is the + z direction, the curved surface of the projection 9a is y The cross section of the −z plane is a curve, and the cross section of the xy plane and the zx plane is a straight line. The curved surfaces of the projections 9b to 9d have the same shape. The concave curved surface 10a also has a curved section in the yz plane and a straight section in the xy plane and the zx plane. The same applies to the concave curved surfaces 10b to 10d. The operation key 2 is disposed on the housing 1 such that the projections 9a to 9d have concave curved surfaces 10a to 10d, respectively, and a gap corresponding to the pressing displacement of the switch 6.
[0020]
4A and 4B show the operation keys 2 mounted on the housing 1 and its peripheral portions, as in FIG. 3. FIG. 4A is a front view, and FIG. 4B is a side view at AA ′. The figure shows a state in which the upper portion 13 of the switch 6a on the operation surface of the operation key 2 is pressed (normally pressed). 5 also shows the operation keys 2 mounted on the housing 1 and its peripheral parts, as in FIGS. 3 and 4, FIG. 5 (a) is a front view, and FIG. 5 (b) is AA '. 5 (c) is a side view taken along line BB '. FIG. 5 illustrates a state in which the intermediate portion 14 on the switch 6b and the switch 6d on the operation surface of the operation key 2 is pressed (obliquely pressed). Reference numeral 19 denotes a coordinate axis corresponding to the side view at BB '.
[0021]
Next, the operation will be described. The display unit 3 displays information on a total of eight patterns including four patterns in which the switches 6a, 6b, 6c, and 6d are pressed, and four patterns in which two adjacent switches (for example, 6a and 6c) are pressed simultaneously. Is displayed. The operator presses the operation surface of the operation key 2 to select one of the eight patterns based on this information. First, the case of normal pressing will be described with reference to FIG. When the upper portion 13 of the switch 6a on the operation surface of the operation key 2 is pressed, the upper portion 13 of the switch 6a is pushed down, and the upper portion of the switch 6b is pushed up with the point of contact with the switch 6c and the point of contact with 6d as a fulcrum. Tilt to be able to. When the switch 6a is depressed by the projection 7a and the dome plate 18 is crushed beyond the allowable stress of the dome plate, the switch detection unit detects the depression (switch on) of the switch 6a. At this time, the projection 9 b approaches the housing 1, but the operation key 2 does not contact the housing 1 because the concave curved surface 10 b is formed.
[0022]
Next, in order to select a pattern to be executed by pressing the switches 6b and 6d at the same time, a case where the operator presses a portion of the operation key 2 between the switch 6b and the switch 6d obliquely is pressed. 5 will be described. When the intermediate portion 14 on the switch 6b and the switch 6d is pressed, the pressed portion of the operation key 2 is first depressed with the point contacting the switch 6b and the point contacting the switch 6d as a fulcrum, and the operation key 2 is pressed on the switch 6a and the switch 6c. Tilt so that the middle part of the can be pushed up. At this time, the protrusions 9 a and 9 c on the outer peripheral side surface of the operation key 2 approach the housing 1. When further pressed, the projections 9a and 9c contact the concave curved surfaces 10a and 10c, respectively. This is because the operation keys 2 are tilted about the point where they touch the switch 6b and the point where they touch the switch 6d as a fulcrum, so that the projections 9a and 9c are lifted upward (−z-axis direction) by a normal depression and the shape of the curved surface thereof. When the projections 9a and 9c are lifted up diagonally, they come into contact with the concave curved surfaces 10a and 10c. As a result, a force in the switch pressing direction is applied to the operation key 2, and the switches 6b and 6d serving as fulcrums are pressed by the projections 7b and 7d, respectively, and the dome plate 18 is crushed when the allowable resistance of the dome plate 18 is exceeded. Thus, the switch detection unit detects simultaneous depression (switch-on) of the switches 6b and 6d.
[0023]
On the other hand, when the operator presses the operation surface on the switch 6b side from the intermediate point on the switch 6b and the switch 6d, the operation key 2 is initially set to a point contacting the switch 6b and a point contacting the switch 6d. The switch 6c is tilted so that an intermediate portion thereof is pushed up. At this time, a force in the pressing direction stronger than 6d is applied to the switch 6b serving as a fulcrum, but the switch 6b is not turned on because the allowable resistance of the dome plate 18 is not exceeded. When the operation surface is further pressed, the protrusions 9a, 9c on the outer peripheral side come into contact with the concave curved surfaces 10a, 10c, the contact load is dispersed, and a uniform force in the switch pressing direction is applied to the protrusions 9a and 9c. As a result, the state becomes the same as that of FIG. 5 described above. The switches 6b and 6d are pressed down evenly by the projections 7b and 7d, respectively, and when the allowable resistance of the dome plate 18 is exceeded, the dome plate 18 is crushed. The detection unit detects simultaneous depression (switch-on).
[0024]
With the above configuration, simultaneous depression of two switches can be detected not only when an intermediate point of two adjacent switches to be simultaneously pressed but also an operation surface deviated from the intermediate point is pressed. This makes it possible to realize a key switch that is easy for the operator to use.
[0025]
FIG. 6 shows a front view (FIG. 6 (a)) and a side view (FIG. 6 (b)) when the same key switch as that of FIG. As shown in the figure, when the portion 15 near the surface of the housing 1 that overlaps the projection 9a is pressed, the bending end of the housing 1 approaches the projection 9a, but a concave curved surface 10a is formed at the end. Therefore, it is difficult to contact the protrusion 9a, and the switch 6a is not pressed by mistake. This makes it possible to prevent the switch 6 from malfunctioning when the housing 1 is pressed by mistake.
[0026]
In the first embodiment, the four switches 6a to 6d are mounted at equal intervals on the circumference. However, the present invention is not limited to this, and two switches are provided for each point. Even in the case of an even number of switches mounted so as to be point symmetric, the same effect as that of the first embodiment can be obtained by providing the projection 9 and the concave curved surface 10 at portions corresponding to the respective switches. . Further, the operation key 2 is not limited to a disk shape, and may be realized by other shapes such as a square operation surface.
[0027]
Embodiment 2 FIG.
Hereinafter, a second embodiment of the present invention will be described. The configuration of the mobile phone provided with the key switch according to the second embodiment is the same as that shown in FIG. 1, and the key switch structure is the same as that shown in FIG. 2, and therefore, description thereof will not be repeated here. .
[0028]
FIGS. 7A and 7B show the operation keys 2 mounted on the housing 1 and the periphery thereof. FIG. 7A is a front view, and FIG. 7B is a side view taken along AA ′. 1, 2 and 3 indicate the same components. In the figure, projections 16a, 16b, 16c, 16d having a dome-shaped curved surface are provided on the eaves 8a to 8d, respectively. In addition, concave end faces 17a, 17b, 17c, and 17d are formed on the end surface of the window 1a of the housing 1 at positions corresponding to the projections 16a to 16d, respectively. The concave curved surface 17a has a curved section on the yz plane and a straight section on the xy plane and the zx plane. The concave curved surfaces 17b to 17d have the same shape. The operation key 2 is disposed on the housing 1 such that the projections 16a to 16d have concave curved surfaces 17a to 17d, respectively, and a gap corresponding to the amount by which the switch 6 is depressed.
[0029]
Next, the operation will be described. The display unit 3 displays information on a total of eight patterns including four patterns in which the switches 6a, 6b, 6c, and 6d are pressed, and four patterns in which two adjacent switches (for example, 6a and 6c) are pressed simultaneously. Is displayed. The operator presses the operation surface of the operation key 2 to select one of the eight patterns based on this information. In the case of normal pressing of each switch, for example, when the upper portion of the operation surface of the operation key 2 on the switch 6a is pressed, the operation key 2 is turned on the point of contact with the switch 6c and the point of contact with the switch 6d as a fulcrum. Is pushed down, and the upper part of the switch 6b is tilted up. When the switch 6a is depressed by the projection 7a and the dome plate 18 is crushed beyond the allowable stress of the dome plate, the switch detection unit detects the depression (switch on) of the switch 6a. At this time, the projection 16b approaches the housing 1, but the operation key 2 does not contact the housing 1 because the concave curved surface 17b is formed.
[0030]
In order to select a pattern to be executed by pressing the switches 6b and 6d at the same time, when the operator presses a part of the operation key 2 between the switch 6b and the switch 6d obliquely, the switch 6b is pressed. When the intermediate portion 14 on the switch 6d is pressed, the pressed portion of the operation key 2 is pressed down with the point contacting the switch 6b and the point contacting 6d as a fulcrum, and the intermediate portion on the switch 6a and the switch 6c is Tilt to push up. At this time, the protrusions 16 a and 16 c on the outer peripheral side surface of the operation key 2 approach the housing 1. When further pressed, the projections 16a and 16c come into contact with the concave curved surfaces 17a and 17c, respectively. This is because the operation keys 2 are tilted about the point where they touch the switch 6b and the point where they touch the switch 6d as a fulcrum, so that the projections 16a and 16c are lifted upward (−z-axis direction) by a normal depression and the shape of the curved surface thereof. When the projections 16a and 16c are lifted up diagonally, they come into contact with the concave curved surfaces 17a and 17c. As a result, a force in the switch pressing direction is applied to the operation key 2, and the switches 6b and 6d serving as fulcrums are pressed by the projections 7b and 7d, respectively, and the dome plate 18 is crushed when the allowable resistance of the dome plate 18 is exceeded. Thus, the switch detection unit detects simultaneous depression (switch-on) of the switches 6b and 6d.
[0031]
On the other hand, when the operator presses the operation surface on the switch 6b side from the intermediate point on the switch 6b and the switch 6d, the operation key 2 is initially set to a point contacting the switch 6b and a point contacting the switch 6d. The switch 6c is tilted so that an intermediate portion thereof is pushed up. At this time, a force in the pressing direction stronger than 6d is applied to the switch 6b serving as a fulcrum, but the switch 6b is not turned on because the allowable resistance of the dome plate 18 is not exceeded. When the operation surface is further pressed, the projections 16a, 16c on the outer peripheral side come into contact with the concave curved surfaces 17a, 17c, the contact load is dispersed, and a uniform force in the switch pressing direction is applied to the projections 16a and 16c. Thus, similarly to the above, the switches 6b and 6d are uniformly pressed by the projections 7b and 7d, respectively, and when the allowable resistance of the dome plate 18 is exceeded, the dome plate 18 is crushed. ON) is detected.
[0032]
With the above configuration, simultaneous depression of two switches can be detected not only when an intermediate point of two adjacent switches to be simultaneously pressed but also an operation surface deviated from the intermediate point is pressed. This makes it possible to realize a key switch that is easy for the operator to use.
[0033]
When the portion near the surface of the housing 1 that overlaps with the projection 16a is pressed, the bent end of the housing 1 approaches the projection 16a, but since the end has the concave curved surface 17a, It is difficult to contact the protrusion 16a, and the switch 6a is not erroneously operated. This makes it possible to prevent the switch 6 from malfunctioning when the housing 1 is pressed by mistake.
[0034]
【The invention's effect】
As described above, the key switch according to the present invention is provided with n outwardly protruding projections corresponding to the n switches on the outer peripheral side surface of the operation key, and provided on the end surface of the case member provided with the operation key. Since the configuration is such that a concave curved surface is formed, simultaneous pressing of the switches by the operator is easy and convenient, and erroneous operation of the switches due to pressing the case member can be prevented.
[0035]
Further, the electronic device according to the present invention includes n outwardly protruding projections corresponding to the n switches on the outer peripheral side surface of the operation key, and has a concave curved surface on an end surface of a housing provided with the operation key. Since the switch is formed, simultaneous depression of the switches by the operator can be detected without error, and erroneous operation of the switches caused by pressing the housing can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a mobile phone provided with a key switch according to the present invention.
FIG. 2 is an exploded perspective view showing a key switch structure according to the present invention.
FIGS. 3A and 3B are a front view and a side view showing an operation key and a peripheral portion thereof according to Embodiment 1 of the present invention; FIGS.
FIG. 4 is a front view and a side view showing an operation key and its peripheral portion at the time of normal pressing according to the first embodiment of the present invention.
FIGS. 5A and 5B are a front view and a side view showing the operation key and its peripheral portion when obliquely pressed according to the first embodiment of the present invention.
FIG. 6 is a front view and a side view showing the operation keys and their peripheral portions when the housing is pressed according to the first embodiment of the present invention.
FIG. 7 is a front view and a side view showing an operation key and its peripheral portion according to a second embodiment of the present invention.
FIG. 8 is a front view and a side view showing an operation key and its peripheral portion in a conventional key switch.
FIG. 9 is a front view and a side view showing an operation key and its peripheral portion when a housing is pressed in a conventional key switch.
[Explanation of symbols]
1 case (case member)
1a Window 2 Operation keys 3 Display portions 6a to 6d Switches 8a to 8d Eave portions 9a to 9d Projection portions 10a to 10d Concave curved surfaces 16a to 16d Projection portions 17a to 17d Concave curved surface 31 Housing 32 Operation keys 36a to 36d Switches 38a to 38d protrusion

Claims (6)

N (n is an even number greater than or equal to 4) switches each arranged so as to be point-symmetrical to one of the other points with respect to one point;
The switch has a back surface, an operation surface serving as a front surface, and an outer peripheral side face sandwiched between the operation surface and the back surface, and presses the operation surface on the switch with a contact point between the switch and the switch adjacent to the pressing portion as a fulcrum. An operation key provided to be able to be normally pressed and obliquely pressed to press an operation surface other than on the switch,
On the outer peripheral side surface of the operation key, there is provided a case member having n projections formed so as to protrude outward corresponding to the switch, and a window for providing the operation key,
An end face of the window of the case member facing the projection of the operation key does not contact the projection when the operation key is normally pressed, but does not contact the projection when the operation key is obliquely pressed. A key switch comprising: The key switch according to claim 1, wherein the protrusion has a convex curved surface having the same curvature as the concave curved surface of the case member. The key switch according to claim 1, wherein the protrusion has a dome shape. N (n is an even number greater than or equal to 4) switches each arranged so as to be point-symmetrical to one of the other points with respect to one point;
The switch has a back surface, an operation surface serving as a front surface, and an outer peripheral side face sandwiched between the operation surface and the back surface, and presses the operation surface on the switch with a contact point between the switch and the switch adjacent to the pressing portion as a fulcrum. An operation key provided to be able to be normally pressed and obliquely pressed to press an operation surface other than on the switch,
N projections formed on the outer peripheral side surface of the operation key so as to respectively project outward corresponding to the switch;
A switch detection unit that is connected to each of the n switches and detects pressing of one switch of the switch and simultaneous pressing of two adjacent switches;
A display unit for displaying information on two simultaneous presses adjacent to each one press of the switch, a display window for providing the display unit, and a housing having an operation key window for providing the operation keys; ,
An end surface of the operation key window facing the projection of the operation key does not contact the projection when the operation key is normally pressed, and is a concave curved surface that contacts the projection when the operation key is obliquely pressed. An electronic device comprising: The electronic device according to claim 4, wherein the protrusion has a convex curved surface having the same curvature as the concave curved surface. The electronic device according to claim 4, wherein the projection has a dome shape.

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