JP3262955B2 - Two-stage switch structure for control destination confirmation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a button
The present invention relates to a two-stage switch structure for confirming a control destination, which is confirmed by an indicator indicating a control state of various actuators.

[0002]

2. Description of the Related Art This type of two-stage switch for confirming a control destination has not been used conventionally. For example, in the case of a general automobile, a plurality of buttons are provided on a dash board or the like. The buttons simply control various actuators such as, for example, 4WD switching. In addition, an indicator indicating a control state or an abnormal state of the various actuators is provided, but this indicator merely illuminates and displays the control state or the abnormal state.

[0003]

However, in conventional automobiles and the like, the display of symbols and the like on buttons becomes less visible as the vehicle becomes darker, and it is difficult to determine which button has what function. May disappear. In particular, when traveling, it is difficult to find a target button, which is often inconvenient. In some cases, the display on each button is turned on. However, a light source must be provided for each button, which is extremely uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object thereof is to provide a two-stage switch structure for confirming a control destination which can easily find a target button even in a dark state and has a low cost. Is to provide.

[0005]

In order to achieve the above-mentioned object, according to the present invention, there is provided a main button, a main contact separated by the main button, and an auxiliary button provided on an operation section of the main button. An auxiliary contact that is separated by the auxiliary button.The main contact is connected to an actuator, and the auxiliary contact is connected to a light source of an indicator corresponding to the actuator. It is characterized in that an auxiliary button provided on the operation unit is operated first to turn on the auxiliary contact, and an indicator is lit before the actuator is operated by the main contact.

According to a second aspect of the present invention, the main button is formed of resin, and the auxiliary button is formed of rubber which is easily elastically deformed, and the auxiliary contact is turned on before the main contact due to the elastic deformation of the auxiliary button. It is characterized by being in a state.

A third aspect of the present invention is characterized in that the auxiliary button is disposed substantially at the center of the operation section of the main button.

[0008]

According to the first aspect of the present invention, if the operating portion of the main button is reached, the auxiliary button first touches the hand. The auxiliary contact can be turned on earlier. That is, before the actuator operates,
An indicator corresponding to this actuator can be lit and displayed. Therefore, it is possible to easily determine whether or not the button currently being pressed is the button of the target actuator by the lighting display of the indicator.

According to the second aspect of the present invention, the main button is formed of resin, and the auxiliary button is formed of rubber which is easily elastically deformed.
Since the auxiliary contact is turned on before the main contact, the indicator can be reliably lighted and displayed before the actuator operates.

According to the third aspect of the present invention, since the auxiliary button is disposed substantially at the center of the operation section of the main button, if the main button is to be pressed, the auxiliary button must be pressed first. Therefore, the auxiliary contact is turned on before the main contact, and the indicator can be reliably lighted and displayed before the actuator operates.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 6, reference numeral 1 denotes a combination meter provided on a dashboard of an automobile, and a display 1a of the combination meter 1 is provided with a speedometer 2, a tachometer 3, various indicators 4, and the like. Also,
A hood 1b is provided around the display unit 1a.

The indicator 4 is provided on an automobile.
For example, a control state or an abnormal state of a 4WD switching device, an ABS (anti-skid brake system), an engine oil or the like is illuminated and displayed. The operation of the 4WD switching device, ABS, etc., is controlled by each actuator 5 (FIG. 5).
).

On the left and right sides of the hood 1b of the combination meter 1, two-stage switches 6 for controlling the actuators 5 and the like are provided. This two-stage switch 6
2 is assembled by sandwiching the main wiring board 7 between the upper case 8 and the lower case 9 and connecting these cases 8 and 9 with screws 10 as shown in FIGS. As shown in FIG. 1, the main wiring board 7 has wiring patterns 7a and 7b on its upper surface, and has wiring patterns 7c and 7d on its lower surface.
It has. The upper case 8 is provided with three through holes 80a at equal intervals. Through hole 80a
Is formed by a guide cylinder 80 for guiding the main button 11 in the axial direction, as shown in FIG.
Is provided with a main button 11 so as to be able to come and go.

The main button 11 is made of an insulating resin and has a cylindrical shape whose upper end is closed as an operation portion 110, and has a lower end with an annular flange 111 whose diameter increases outward.
Is provided. The annular flange 111 abuts on the lower end of the guide cylinder 80 to prevent the main button 11 from being pulled out upward.

The operation portion 110 of the main button 11 has a circular through hole 110b at the center of the operation surface 110a.
On the back surface 110c, a concave portion 110d surrounding the through hole 110b in a circular shape is formed. And this through hole 1
The auxiliary button 12 is provided so as to fit into the recess 10d and the recess 110d.

The auxiliary button 12 is integrally formed of rubber having insulation and elasticity.
An operation portion 120 is fitted to the outer portion 0b so as to be movable in the axial direction, and a base portion 121 is fitted to the concave portion 110d. The operation unit 120 has an operation surface 120 a that is the main button 11.
Project from the operation surface 110a. The base 121 has a recess 121b on the back surface 121a, and a conductive contact 122 is provided at the center of the recess 121b.
The conductive contact 122 is formed of conductive rubber containing carbon, and is provided integrally with the recess 121b by a fixing means such as bonding.

The main button 11 has an operation unit 11
The auxiliary wiring board 13 is provided so as to be in close contact with the back surface 110c of the “0” and the back surface 121a of the auxiliary button 12. The auxiliary wiring board 13 has a wiring pattern 13 on its upper surface.
a, 13b, and these wiring patterns 13a, 13b are connected or disconnected by the conductive contact 122. That is, a normally open auxiliary contact B having the wiring patterns 13a and 13b as fixed contacts and the conductive contact 122 as a movable contact is configured.

Further, the wiring pattern 13a is connected to the wiring pattern 7 via the conductive shaft 14 and the conductive spring 15.
a, and the wiring pattern 13b is connected to the conductive shaft 16
And a conductive spring 17 connected to the wiring pattern 7b. The upper ends of the conductive shafts 14 and 16 are caulked to the wiring patterns 13a and 13b and connected by soldering M, and the lower ends of the conductive shafts 14 and 16 are slidable in through holes 7e formed in the main wiring board 7. ing. The conductive spring 15 is provided so as to surround the conductive shaft 14 and is not compressed between the rib 14a of the conductive shaft 14 and the wiring pattern 7a. Similarly, the conductive spring 17 surrounds the conductive shaft 16 so that the rib 1
It is provided in an uncompressed state between the wiring pattern 6a and the wiring pattern 7b.

A return spring 1 for urging the main button 11 upward is provided outside these conductive springs 15 and 17.
8 are provided. The return spring 18 is formed in a cylindrical spiral shape so as to surround the entirety of the conductive springs 15, 17, etc., the upper end of which is in contact with the lower surface of the auxiliary wiring board 13, and the lower end of which is via an insulating ring 19. It is in contact with the upper surface of main wiring board 7. The insulating ring 19 has a cylindrical portion 19a for maintaining an insulating state between the return spring 18 and the conductive springs 15 and 17, and a diameter expanding from the lower end of the cylindrical portion 19a to the outside to return the return spring 18 and each wiring pattern 7a. , 7b maintaining an insulated state between them
9b.

On the upper surface of the main wiring board 7, there is an ON section having a movable portion Aa at a position corresponding to the center of the main button 11.
An / OFF switch (main contact) A is provided. The ON / OFF switch A has a contact that is turned on when pressed once and turned off when pressed again. When the main button 11 is pressed, the ON / OFF switch A passes through the lower surface of the auxiliary wiring board 13 that moves up and down together with the main button 11. , ON / OFF
Operation is performed.

However, when the auxiliary button 12 is pressed,
The contact between the conductive contact 122 and the wiring patterns 13a and 13b is made first, and when the auxiliary button 12 is pressed, the ON / OFF switch A is turned ON or OFF via the main button 11. That is, the elastic force of the return spring 18 is set sufficiently larger than the elastic force of the auxiliary button 12. The terminals A1 and A2 of the ON / OFF switch A are respectively connected to the wiring patterns 7c and 7c.
d is connected by soldering. That is, ON
When the / OFF switch A is turned on / off, the wiring patterns 7c and 7d are connected or disconnected.

As described above, the two-stage switch 6 is provided with three switches. The electric circuit of the two-stage switch 6 is schematically shown in FIG. The wiring pattern 13a is connected to the light source 23 of the various indicators 4 (see FIG. 6) via the conductive shaft 14, the conductive spring 15, the wiring pattern 7a, the wiring 21, the connector 22, and the like. , Conductive shaft 16, conductive spring 17, wiring pattern 7b, wiring 2
1, connected to a power supply 24 via a connector 22 and the like. On the other hand, the wiring pattern 7c includes the wiring 21 and the connector 2
2 and the like, and connected to each actuator 5.
The wiring pattern 7c is connected to the power supply 24 via the wiring 21, the connector 22, and the like. The wiring 21 and the connector 22 are arranged outside the upper case 8 and the lower case 9 as shown in FIG. The light source 23 is provided as a light source of the indicator 4 that displays a control state or an abnormal state of each actuator 5.

In the control destination confirmation two-stage switch structure configured as described above, if the upper surface of the main button 11 is lightly pressed, the auxiliary button 12 is first depressed. Then, the conductive contact 122 is connected to the wiring pattern 13.
a, 13b, the wiring patterns 13a, 13b are connected, and the light source 23 of the indicator 4 corresponding to the wiring patterns 13a, 13b is turned on. Therefore, it can be seen from the light-on display of the indicator 4 whether or not the button currently being pressed corresponds to the target actuator 5. Therefore, if the display of the indicator 4 is not that of the target actuator 5, the other main button 11 is lightly pressed to search for the main button 11 of the target actuator 5. If the main button 11 corresponds to the target actuator 5, the main button 11 is further pressed. Then, this time, the main button 11 is depressed, and the ON / OFF switch A is turned on. That is, the target actuator 5 operates.

Therefore, even when the surroundings are dark,
By simply pressing each button of the two-stage switch 6, it is possible to easily confirm whether or not the button to be pressed is correct by turning on the indicator 4. In addition, since the light source 23 provided conventionally is used for lighting the indicator 4, the cost can be reduced.

In the above embodiment, the conductive contacts 1
Although an example is shown in which the conductive contact 22 is formed of conductive rubber, the conductive contact 122 may be configured such that a conductive substance (ink containing carbon or the like) is provided in the recess 121b of the auxiliary button 12 by printing or coating. Good.

Although the example in which the auxiliary button 12 is formed of rubber has been described, the auxiliary button 12 may be formed of a resin plate such as polycarbonate as shown in FIG. However, it is preferable to provide a flexible portion 123 around the conductive contact 122 so that the conductive contact 122 easily contacts the wiring patterns 13a and 13b when the auxiliary button 12 is pressed. Note that, in FIG.
Although an example using conductive rubber as 2 is shown, the conductive contact 122 may also be formed by printing or coating a conductive substance as described above.

Further, the auxiliary button 12 may be formed entirely of conductive rubber containing carbon. in this case,
Although the concave portion 121b becomes the conductive contact 122 as it is, the conductive contact 122 may be formed in a convex shape as shown in FIG. 1 or may be the planar concave portion 121b. However, the auxiliary wiring board 13 and the conductive shaft 1
It is necessary to insulate portions such as 4, 15 and their soldered portions M, which need to avoid electrical contact, by interposing an insulator or by printing or coating for insulation.

The outer peripheral surface of the main button 11 and the through hole 8
0a is provided with a groove extending in the axial direction, and the other is provided with a ridge movably fitted in this groove so that the main button 11 does not rotate with respect to the upper case 8. Is preferred. With this configuration, the load on the soldering M due to the twisting of the auxiliary wiring board 13 and the conductive shafts 14 and 16 can be reduced, and the reliability of the soldering M can be improved. In addition, it is possible to prevent the conductive shafts 14 and 16 and the through hole 7e from being caught due to the twisting.

Next, a second embodiment of the present invention will be described with reference to FIG. However, the same elements as those of the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and the description will be simplified for the same elements.
The difference between the second embodiment and the first embodiment is mainly that
The difference is that the structure of each switch in the stage switch 6 is different.

That is, as shown in FIG. 8, the two-stage switch 6 is assembled by sandwiching the main wiring board 7 between the upper case 8 and the lower case 9 and connecting these cases 8, 9 with screws 10. ing. The main wiring board 7 has a wiring pattern 70 on its lower surface. The upper case 8 is provided with three through holes 80a at equal intervals, and a guide cylinder 80 for guiding the main button 11 in the axial direction is formed inside the through holes 80a. The guide cylinder 80 and the through hole 80a are both formed in a circular shape and are arranged coaxially. However, the diameter of the through-hole 80a is
0 is formed smaller than the inner diameter of the through hole 80a.
Around the main button 11 is a retaining flange portion 80b upward.
It has become. A guide groove 80c extending in the axial direction is formed on the inner surface of the guide cylinder 80 at a position divided into four equal parts in the circumferential direction.

The main button 11 is made of an insulating resin, and has a disk-shaped operating portion 110, an upper cylindrical portion 112 extending downward from the outer periphery of the operating portion, and a step portion extending radially from the upper cylindrical portion 112. 113 and a lower cylindrical portion 114 extending downward from the outer periphery of the step portion 113. The upper cylindrical portion 112 is formed so that its outer peripheral surface fits into the through hole 80a, the step portion 113 is formed so as to abut on the retaining flange portion 80b, and the lower cylindrical portion 114 has its outer peripheral surface formed of the guide cylinder 80. It is formed so as to fit on the inner surface. The guide cylinder 8 is provided on the outer peripheral surface of the lower cylindrical portion 114.
A convex ridge 114a that fits into each of the 0 guide grooves 80c is formed, so that the main button 11 can move to and from the upper case 8 without rotating with respect to the upper case 8. .

The operation portion 110 of the main button 11 has a circular through hole 110b formed in the center of the operation surface 110a, and a cylindrical surface inside the through hole 110b for guiding the auxiliary button 12 in the axial direction. 110e is formed. The cylindrical surface 110e and the through hole 110b are both formed in a circular shape and are coaxially arranged. However, the diameter of the through hole 110b is formed smaller than the inner diameter of the cylindrical surface 110e, and the area around the through hole 110b is the auxiliary button 1
2 is formed as a retaining flange 110f upward. The cylindrical surface 110e is formed so as to open downward, and the auxiliary button 12 is inserted into the cylindrical surface 110e from below.

The auxiliary button 12 includes an auxiliary button body 124
And a pressing member 125 provided in the auxiliary button body 124, and an auxiliary contact spring 126 for urging the pressing member 125 downward. The auxiliary button main body 124 is formed by an operation portion 120 that is movably fitted in the through hole 110b in the axial direction and a cylindrical base 121 that is movably fitted in the cylindrical surface 110e in the axial direction. The operation unit 120 is formed such that the operation surface 120a protrudes from the operation surface 110a of the main button 11. A guide groove 121a penetrating in the radial direction is formed in the cylindrical base 121 at least at a position where the cylindrical base 121 is equally divided into two.
a is fitted.

The pressing member 125 directly presses a tact switch (auxiliary contact) B provided on the main wiring board 7,
The auxiliary button body 124 is turned ON / OFF, and the downward movement of the auxiliary button body 124 is restricted by the contact of the claw 125a with the lower end of the guide groove 121a. The auxiliary contact spring 126 includes the operating unit 120 and the pressing member 12.
5 so that the pressing member 125 is constantly urged downward. That is, the auxiliary contact spring 126 urges the claw 125a of the pressing member 125 to always contact the lower part of the guide groove 121a.

The lower cylindrical portion 114 of the main button 11 is formed with a first annular groove 114b which extends circumferentially and opens downward.
Is provided with a cylindrical spiral return spring 18. The return spring 18 has a first annular groove 114.
The main button 11 is provided in a compressed state between the main button 11 and the main wiring board 7 so as to constantly urge the main button 11 upward. That is, the return spring 18 is connected to the main button 11.
The step 113 is urged to always contact the retaining flange 80b.

Further, the lower cylindrical portion 114 is provided with a guide groove 114 penetrating in the radial direction at a position at least bisected.
The conductive contact 115 is provided so as to be guided by the guide groove 114c. The conductive contact 115 is formed of a metal having conductivity, and has a hollow disk-shaped contact portion 115a formed so as to surround the tact switch B, and a lower cylindrical portion 114 from the outer periphery of the contact portion 115a. Guide plate 11 extending along the inner surface of
5b. Then, the guide plate portion 115
B is formed with a claw 115c that fits into the guide groove 114c. The claw 115c is movably fitted along the guide groove 114c, and abuts on the lower end of the guide groove 114c to restrict downward movement of the main button 11.

Further, a second annular groove 114d is formed in the upper cylindrical portion 112 so as to make a round in the circumferential direction and open downward. The second annular groove 114d has a cylindrical spiral main portion. A contact spring 116 is provided. The main contact spring 116 is provided with a second annular groove 114d.
The conductive contact 115 is provided in a compressed state between the conductive contact 115 and the conductive contact 115 so as to always urge the conductive contact 115 downward. That is, the main contact spring 116 biases the claw 115c of the conductive contact 115 so as to abut the guide groove 114c.

A terminal A is provided below the conductive contact 115.
1, A2 are provided. These terminals A1,
A2 is fixed to the main wiring board 7 on both sides of the tact switch B, is soldered to the wiring pattern 70, and is connected to various actuators 5 via the wiring pattern 70 and the like. In the terminals A1 and A2, the main button 11 is
When the main button 11 is pressed against the return spring 18 when the main button 11 is pressed against the return spring 18, the conductive contacts 115 are separated from the terminals A 1 and A 2. To come into contact with. That is, a normally-open main contact A having the conductive contact 115 as a movable contact and the terminals A1 and A2 as fixed contacts is configured. When the main button 11 is pressed once, the pressed state is maintained and the main contact A is turned ON.
When the switch is pressed again, it returns to the original position and the main contact A is turned off.

The tact switch B includes a pressing member 125
, And are coaxially arranged with the auxiliary button switch 12 and the main button 11, and their terminals B1 and B2 are soldered to the wiring pattern 70 and further connected to the light source 23 via the wiring pattern 70 and the like. ing. The tact switch B is configured such that the movable portion Ba is urged upward with a predetermined force, and the contact is turned on when the movable portion Ba is pressed downward by a predetermined amount, and turned off when the movable portion Ba is released. Has become. The tact switch B allows the auxiliary button 12 to abut on the retaining flange 110f of the main button 11 by the upward urging force of the movable portion Ba when the main button 11 is in contact with the retaining flange 80b. It has become. However, in a state where the auxiliary button 12 is in contact with the retaining flange 110f, the tact switch B is in the OFF state.

The auxiliary contact spring 126 is set to a biasing force slightly larger than that of the movable portion Ba of the tact switch B. Therefore, when the auxiliary button 12 is pressed, the auxiliary contact spring 126 and the pressing member 1 are pressed.
25, the movable portion Ba moves and the tact switch B
Is turned on. The biasing force of the return spring 18 is set to a biasing force sufficiently larger than the biasing forces of the auxiliary contact spring 126 and the movable portion Ba. Therefore, by pressing the auxiliary button 12, the tact switch B is turned on.
Even in the state, the main button 11 does not move.

Then, the main button 11 is moved by pressing with a force larger than the urging force of the return spring 18.
At this time, the conductive contact 115 contacts the terminals A1 and A2, and the main contact spring 116 bends by a predetermined amount. Therefore, the conductive contacts 115 are connected to the terminals A1, A
2 comes into contact with a certain force. The auxiliary contact spring 126 also bends by a predetermined amount, thereby absorbing the force applied to the tact switch B.

In the two-stage switch for confirming the control destination configured as described above, when the upper center of the main button 11 is lightly pressed, the auxiliary button 12 is first depressed, and the tact switch B is turned on. State. For this reason,
The light source 23 of the indicator 4 corresponding to the auxiliary button 12 is turned on. Therefore, if the lighting display of the indicator 4 is not the one of the target actuator 5, the finger is moved to another main button 11, and the upper surface of the main button 11 is lightly pressed again. If the main button 11 corresponds to the target actuator 5, the main button 11 is further pressed to turn the main contact A on. Thereby, the target actuator 5 can be operated without fail. In addition, the same functions and effects as those of the first embodiment are obtained.

According to the second embodiment, as in the first embodiment, the conductive contacts 122 and the wiring patterns 13a,
3b, a second contact point between each of the ribs 14a, 16a of the conductive shafts 14, 16 and each of the conductive springs 15, 17, and a second contact point between each of the conductive springs 15, 17 and the wiring patterns 7a, 7b. Since the switch does not have many contact points unlike the third contact point, the reliability of the switch can be improved. Moreover, unlike the first embodiment, since the conductive shafts 14 and 16 do not protrude below the main wiring board 7, the space over which the lower case 9 extends below can be reduced. That is, the size can be reduced. Further, only one of the main wiring boards 7 is required as the wiring board, and the main wiring board 7 only needs to be provided with the wiring pattern 70 on one surface, so that the cost can be reduced. Also, terminals A1 and A2 and conductive contacts 11
5 is made constant by the main contact spring 116 and the force applied to the tact switch B is also made constant by the auxiliary contact spring 126. Therefore, an excessively large force is applied to the main contact A and the tact switch (auxiliary contact) B. Can be prevented from acting. That is, the reliability of the main contact A and the auxiliary contact B can be improved.

[0045]

According to the first aspect of the present invention, if the operating portion of the main button is lightly pressed even when the surroundings are dark, the auxiliary button is first activated, and the main button is operated. Since the indicator corresponding to the button is illuminated and displayed, it is possible to easily confirm whether the button being pressed is correct. In addition, since only the light source of the conventional indicator is used as the light source, there is an advantage that the cost can be reduced.

According to the second aspect of the present invention, the main button is formed of resin, and the auxiliary button is formed of rubber which is easily elastically deformed. The elastic deformation of the auxiliary button causes the auxiliary contact to precede the main contact. Is turned on, the indicator can be reliably lit and displayed before the actuator operates.

According to the third aspect of the present invention, since the auxiliary button is arranged substantially at the center of the operation section of the main button, if the main button is to be pressed, the auxiliary button must be first pressed. Therefore, the auxiliary contact is turned on before the main contact, and the indicator can be reliably lighted and displayed before the actuator operates.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a two-stage switch structure for confirming a control destination shown as a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the two-stage switch structure for confirming the control destination, which is a cross-sectional view along the line II-II in FIG. 4;

FIG. 3 is a sectional view of a main part of the two-stage switch structure for confirming the control destination, which is a sectional view along the line III-III in FIG. 4;

FIG. 4 is a plan view of a two-stage switch structure for confirming the control destination.

FIG. 5 is an electric circuit diagram of the two-stage switch structure for confirming the control destination.

FIG. 6 is an explanatory diagram showing a state in which the two-stage switch structure for confirming the control destination is provided in a meter unit.

FIG. 7 is a sectional view showing another example of the auxiliary button having the two-stage switch structure for confirming the control destination.

FIG. 8 is a sectional view of a main part of a two-stage switch structure for confirming a control destination shown as a second embodiment of the present invention.

[Explanation of symbols]

 5 Actuator 11 Main button 12 Auxiliary button 23 Light source 110 Operation section A Main contact (ON / OFF switch) B Auxiliary contact (tact switch)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 13/00-13/76 H01H 25/00-25/04

Claims (3)

(57) [Claims] 1. A main button, a main contact separated by the main button, an auxiliary button provided on an operation section of the main button, and an auxiliary contact separated by the auxiliary button. The auxiliary contact is connected to an actuator, and the auxiliary contact is connected to a light source of an indicator corresponding to the actuator. When operating the main button, an auxiliary button provided on an operation unit of the main button is operated first to turn on the auxiliary contact. A two-stage switch structure for confirming a control destination characterized in that an indicator is lit and displayed before an actuator is operated by a main contact. 2. The main button is made of a resin, and the auxiliary button is made of rubber which is easily elastically deformed. The elastic deformation of the auxiliary button turns on the auxiliary contact prior to the main contact. The two-stage switch structure for confirming a control destination according to claim 1, wherein: 3. The two-stage switch structure for confirming a control destination according to claim 1, wherein the auxiliary button is disposed substantially at the center of the operation section of the main button.