JP5184227B2 - Key press detection device - Google Patents

Description

  The present invention relates to a key press detection device. More specifically, the present invention relates to a key press detection device that detects that a predetermined key is pressed when a current flows between two or more wires.

2. Description of the Related Art Conventionally, a portable electronic device having a plurality of keys, such as a cellular phone, includes a key press detection device that detects which of the plurality of keys is pressed (see, for example, Patent Document 1). This key press detection device has a circuit configuration in which a plurality of wirings are arranged in a row direction and a column direction called a key matrix provided on a substrate. When any one of the plurality of keys is pressed, a predetermined wiring of the plurality of wirings arranged in the row direction and a predetermined wiring of the plurality of wirings arranged in the column direction Are electrically connected. The key press detection device identifies the pressed key by detecting the current of the connected wiring.
JP-A-2005-150121

For example, in a cross key that performs scrolling in the up / down / left / right directions in a mobile phone, wiring connection patterns corresponding to the up key, the right key, the down key, and the left key are assigned. Metal domes are arranged between the upper key, right key, lower key and left key and the substrate, respectively, and when the key is pressed, the metal dome is deformed to electrically connect predetermined wires to each other. Connecting.
In such a cross key, for example, a predetermined operation is assigned to double pressing of a key such as pressing the upper key and the right key simultaneously. That is, when the upper key and the right key are pressed simultaneously, the key press detection device specifies that the upper right key is pressed.

  Here, an upper right key is provided between the upper key and the right key, and when the upper right key is pressed, the metal dome pressed by the upper key and the metal dome pressed by the right key are simultaneously pressed. There has been proposed a key press detection device provided with.

  However, in the above method, since it is necessary to further provide a member between the key and the substrate for pressing the metal dome pressed by the up key and the metal dome pressed by the right key at the same time, the key is arranged. The thickness of the key operation unit will increase. Therefore, there has been a problem that thinning of the mobile phone is hindered.

  In addition to the wiring for specifying the upper key and the wiring for specifying the right key, a method of providing a wiring for specifying the upper right key has also been proposed. In this method, the upper right key is specified. For this reason, there is a problem in that a new wiring is required, which complicates the key matrix and increases the manufacturing cost of the key press detection device.

  Accordingly, an object of the present invention is to provide a key press detection device capable of detecting a double press of a key without compromising a thin key operation unit and without complicating a key matrix.

  The present invention is a key press detection device that detects that a predetermined key is pressed due to a current flowing between two or more wires, and includes a substrate having a first wire, a second wire, and a third wire; A first key, a second key, and a third key that are arranged on the substrate and are each pressed independently, and electrically connecting the first wiring and the second wiring by pressing the first key. A first connection portion that connects the first wiring and the third wiring by pressing the second key; and the first wiring by pressing the third key. The present invention relates to a key press detection device including a third connection portion that electrically connects the second wiring and the third wiring.

  The first wiring includes a first terminal portion, a second terminal portion, and a third terminal portion formed by exposing a part of the first wiring, and the second wiring includes the first wiring. The third wiring is configured to include a fourth terminal portion and a fifth terminal portion formed by exposing a part of the second wiring, and the third wiring is a sixth terminal formed by exposing a part of the third wiring. And a seventh terminal portion, wherein the first connection portion comes into contact with the first terminal portion and the fourth terminal portion by pressing the first key, and the second connection portion is When the second key is pressed, the second terminal portion and the sixth terminal portion are brought into contact with each other, and when the third key is pressed, the third terminal portion, the fifth terminal portion, and the third terminal portion are brought into contact with each other. It is preferable to contact the seventh terminal portion.

  Moreover, it is preferable that one terminal part of the said 1st terminal part and the said 4th terminal part is cyclic | annular, and the other terminal part is arrange | positioned inside the said one terminal part.

  In addition, one of the third terminal portion, the fifth terminal portion, and the seventh terminal portion is annular, and of the third terminal portion, the fifth terminal portion, and the seventh terminal portion. It is preferable that two terminal portions different from the one terminal portion are arranged inside the one terminal portion.

  Moreover, it is preferable that one terminal part of the two terminal parts has a region sandwiched between the other terminal parts.

  The substrate is configured such that the first wiring, the second wiring, and the third wiring are sandwiched between a plurality of insulating members, and a part of each of the two terminal portions includes the plurality of insulating members. It is preferable that the third connecting portion is in contact with a portion of the two terminal portions located in a region where the plurality of insulating members are not present.

  According to the key press detection device of the present invention, the thinning of the key operation unit is not impaired. In addition, it is possible to detect double pressing of the key without complicating the key matrix.

  Hereinafter, a preferred embodiment for carrying out the present invention will be described with reference to the drawings. First, the basic structure of a mobile phone 1 including a key press detection device according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view showing the mobile phone 1 with the operation unit side body 2 and the display unit side body 3 opened. FIG. 2 is an exploded perspective view of the operation unit side body 2. FIG. 3 is a plan view of the operation unit side body 2. 4 is a cross-sectional view taken along line XX of FIG.

  As shown in FIG. 1, the mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 and the display unit side body 3 are connected to each other through a connection unit 4 having a hinge mechanism. Specifically, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected to each other via the connection unit 4 so as to be opened and closed. That is, the connecting portion 4 connects the display unit side body 3 and the operation unit side body 2 so as to be openable and closable around the opening / closing axis I.

  The cellular phone 1 relatively rotates (rotates) the operation unit side body 2 and the display unit side body 3 connected via the connection unit 4, thereby causing the operation unit side body 2 and the display unit to be rotated. The side housing 3 can be brought into an open state (open state), or the operation unit side housing 2 and the display unit side housing 3 can be folded (folded state). Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other.

  The outer surface of the display unit side body 3 is mainly composed of a front case 3a and a rear case 3b. In the front case 3a, an LCD display 31 for displaying various information and a speaker 32 as a receiver for outputting the voice of the other party of the call are disposed so as to be exposed.

  The LCD display unit 31 includes a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit (not shown) such as a backlight that emits light from the back side of the liquid crystal panel. The LCD display unit 31 displays numbers, characters, images, and the like according to various functions of the mobile phone 1.

As shown in FIG. 2, the operation unit side body 2 has an outer surface mainly composed of a front case 2a and a rear case 2b.
As shown in FIG. 1, the operation unit side body 2 has a plurality of keys 11 and a microphone 21 as a microphone to which a voice uttered by a user of the mobile phone 1 is input on the front case 2 a side. Each is configured to be exposed.

  A plurality of keys 11 includes a function setting operation key 12 for operating various functions such as various settings, a telephone book function, a mail function, and the like, and an input operation key 13 for inputting numbers such as telephone numbers and characters such as mail. And a determination operation key 14 for performing determination in various operations, scrolling in the vertical and horizontal directions, and the like.

As shown in FIG. 3, the determination operation key 14 includes an annular cross key 141 and a determination key 142 arranged inside the cross key 141.
In the state shown in FIG. 3, the cross key 141 has an upper key 141a as a first key located on the upper side, a right key 141b as a second key located on the right side, a lower key 141c located on the lower side, and A left key 141d is provided on the left side. Further, an upper right key 141e as a third key is provided between the upper key 141a and the right key 141b, a lower right key 141f is provided between the right key 141b and the lower key 141c, and a lower key 141c and a left key 141d are provided. A lower left key 141g is provided between the left key 141d and an upper left key 141h is provided between the left key 141d and the upper key 141a.

The upper key 141a, the right key 141b, the lower key 141c, the left key 141d, the upper right key 141e, the lower right key 141f, the lower left key 141g, and the upper left key 141h are all configured from an annular cross key 141. Each of these keys is pressed independently.
Here, “each is pressed independently” means that pressing any one key does not cause other keys to be mechanically pressed. Indicates that it is not related to pressing the key.

  A predetermined function is assigned to each of the plurality of keys 11 according to the open / closed state of the operation unit side body 2 and the display unit side body 3, various modes, or the type of the activated application (key / Assignment). When the user presses each key, a pressed key detection device described later identifies the pressed key, and an operation corresponding to the function assigned to each key is executed.

  The microphone 21 is disposed on the outer end side opposite to the connecting portion 4 side in the longitudinal direction of the operation unit side body 2. That is, the microphone 21 is arranged on one outer end side in the open state of the mobile phone 1.

  As shown in FIG. 2, between the front case 2a and the rear case 2b, in order from the front case 2a side, a key sheet 40 having a plurality of keys 11, a flexible wiring board 50 as a board, and a case member 60 and the circuit board 70 are stacked and incorporated.

  The front case 2 a is provided with a plurality of key holes 22 having shapes corresponding to the shapes of the plurality of keys 11.

  The key sheet 40 is configured by attaching a plurality of keys 11 to one surface of a silicon rubber sheet 45 with an adhesive. The plurality of keys 11 in the key sheet 40 are arranged so as to be exposed from the plurality of key holes 22 provided in the front case 2a.

As shown in FIG. 4, the flexible wiring board 50 includes a first wiring A, a second wiring B, and a third wiring C, which will be described later, between two insulating films 52 and 52 made of polyimide resin as insulating members. A plurality of wirings 53 including them are sandwiched. A plurality of terminal portions 54 including a first terminal portion A1 to a seventh terminal portion C2, which will be described later, are formed on the surface of the flexible wiring board 50 on the front case 2a side. The plurality of terminal portions 54 are formed by exposing a part of each of the plurality of wirings 53 sandwiched between the two insulating films 52 and 52. A plurality of key switches 51 are arranged on the surface of the flexible wiring board 50 on the front case 2a side.
The plurality of key switches 51 are arranged at positions overlapping with the plurality of keys 11 provided on the key sheet 40.

  As shown in FIGS. 2 and 4, each of the plurality of key switches 51 includes a metal dome that is three-dimensionally curved in a bowl shape. On the inner surface at the apex of the metal dome, a convex portion 511 protruding inward is provided. When the apex of the bowl-shaped metal dome is pressed, the convex portion 511 comes into contact with the terminal portion 54 formed on the predetermined wiring 53 and the peripheral portion forms the terminal portion 54 with which the convex portion 511 contacts. The two or more wirings 53 are electrically connected by contacting a terminal portion 54 formed on the wiring 53 different from the wiring 53 formed.

The case member 60 functions as a shield case and is attached in a state of being placed on the surface of the circuit board 70 on the front case 2a side.

  A plurality of electronic components 71 such as an RF (Radio Frequency) circuit, a CPU circuit, and a power supply circuit are mounted on the surface of the circuit board 70 on the front case 2a side. The plurality of electronic components 71 are electrically connected by wiring 72 provided on the circuit board 70, wiring (not shown) provided in the circuit board 70, and the like.

  An opening is provided outside the rear case 2b, and the battery 80 is detachably accommodated in the opening. The outside of the battery 80 is covered with a battery cover 81.

  An interface (not shown) for communicating with an external device (for example, a host device) is disposed on one side surface of the operation unit side body 2. On the other side surface of the operation unit side body 2, a side key 16 to which a predetermined function is assigned and an interface (not shown) for inserting and removing an external memory are arranged. The interface is covered with a cap 17.

Next, the key press detection device according to the first embodiment will be described with reference to FIGS.
FIG. 5 is an enlarged plan view of a portion of the flexible wiring board 50 that overlaps the determination operation key 14. FIG. 6 is a diagram schematically showing the arrangement of the first wiring A, the second wiring B, and the third wiring C.

  As shown in FIGS. 5 and 6, the key press detection device is disposed on the flexible wiring board 50 as a board having the first wiring A, the second wiring B, and the third wiring C, and the flexible wiring board 50. An upper key 141a as a first key, a right key 141b as a second key, an upper right key 141e as a third key, and the first wiring A and the second wiring B are electrically connected by pressing the upper key 141a. The first key switch 512 as the first connection portion, the second key switch 513 as the second connection portion that electrically connects the first wiring A and the third wiring C by pressing the right key 141b, and the upper right key 141e And a third key switch 514 as a third connection portion that electrically connects the first wiring A, the second wiring B, and the third wiring C when pressed.

  When the key press detection device detects an electrical connection between the first wiring A and the second wiring B, the key press detection device specifies that the upper key 141a is pressed. When an electrical connection between the first wiring A and the third wiring C is detected, it is specified that the right key 141b is pressed. When an electrical connection between the first wiring A, the second wiring B, and the third wiring C is detected, it is specified that the upper right key 141e is pressed.

As shown in FIGS. 5 and 6, the first wiring A includes a circular first terminal portion A1 provided at a portion overlapping the upper key 141a, and an annular second terminal provided at a portion overlapping the right key 141b. An annular third terminal portion A3 provided at a portion overlapping the portion A2 and the upper right key 141e is provided.
The second wiring B is provided in a portion overlapping the upper key 141a, and is provided in a portion overlapping the annular fourth terminal portion B1 and the upper right key 141e disposed so as to surround the first terminal portion A1. A fifth terminal portion B2 disposed inside A3 is provided.
The third wiring C is provided in a portion overlapping the right key 141b, provided in a portion overlapping the circular sixth terminal portion C1 disposed inside the second terminal portion A2 and the upper right key 141e, and the third terminal portion. A seventh terminal portion C2 disposed inside A3 is provided.

As shown in FIG. 5, the 1st key switch 512 is arrange | positioned in the part which overlaps with the upper key 141a. The first key switch 512 is arranged so that the peripheral edge of the metal dome is positioned on the annular fourth terminal portion B1 and the top is positioned on the first terminal portion A1.
The second key switch 513 is disposed in a portion overlapping the right key 141b. The second key switch 513 is arranged so that the peripheral edge of the metal dome is located on the second terminal portion A2 and the top is located on the sixth terminal portion C1.
The third key switch 514 is disposed in a portion overlapping the upper right key 141e. The third key switch 514 is arranged so that the peripheral edge of the metal dome is located on the third terminal part A3 and the top part is located on the fifth terminal part B2 and the seventh terminal part C2.

  As shown in FIG. 5, each of the fifth terminal portion B2 and the seventh terminal portion C2 has a substantially U shape. And it arrange | positions so that the one end side of 5th terminal part B2 may enter between the both ends of 7th terminal part C2, and the one end side of 7th terminal part C2 may enter between the both ends of 5th terminal part B2. That is, a region sandwiched between the seventh terminal portions C2 is provided on one end side of the fifth terminal portion B2. Similarly, a region sandwiched between the fifth terminal portions B2 is provided on one end side of the seventh terminal portion C2.

Next, the operation of the key press detection device described above will be described with reference to FIGS.
7 is a cross-sectional view taken along line YY of FIG. FIG. 8 is a diagram illustrating a state where the first key switch 512 is modified from the state illustrated in FIG. 7 and the first key switch 512 is in contact with the first terminal portion A1 and the fourth terminal portion B1. 9 is a cross-sectional view taken along the line ZZ in FIG. FIG. 10 shows a state in which the third key switch 514 is modified from the state shown in FIG. 9 and the third key switch 514 is in contact with the third terminal portion A3, the fifth terminal portion B2, and the seventh terminal portion C2. FIG.

  First, when the upper key 141a is pressed, the upper key 141a presses the first key switch 512. Then, the first key switch 512 pressed by the upper key 141a causes the top portion of the metal dome to be deformed toward the flexible wiring board 50 and the convex portion 511 contacts the first terminal portion A1, and the peripheral portion of the metal dome is It contacts 4th terminal part B1 (refer FIG.7 and FIG.8). As a result, the first terminal portion A1 and the fourth terminal portion B1 are electrically connected and a current flows between the first wiring A and the second wiring B. Therefore, the key press detection device has the upper key 141a Identifies that it was pressed.

  Next, when the right key 141b is pressed, the right key 141b presses the second key switch 513. Then, the second key switch 513 pressed by the right key 141b causes the top portion of the metal dome to be deformed to the flexible wiring board 50 side so that the convex portion 511 contacts the sixth terminal portion C1, and the peripheral portion of the metal dome is It contacts the second terminal portion A2 (not shown). As a result, the sixth terminal portion C1 and the second terminal portion A2 are electrically connected, and a current flows between the first wiring A and the third wiring C. Therefore, the key press detection device has the right key 141b. Specify that is pressed.

  Next, when the upper right key 141e is pressed, the upper right key 141e presses the third key switch 514. Then, the third key switch 514 pressed by the upper right key 141e is such that the top of the metal dome is deformed toward the flexible wiring board 50 and the convex portion 511 contacts the fifth terminal portion B2 and the seventh terminal portion C2, The peripheral part of the metal dome contacts the third terminal part A3. As a result, the third terminal portion A3, the fifth terminal portion B2, and the seventh terminal portion C2 are electrically connected, and a current flows between the first wiring A, the second wiring B, and the third wiring C. The key press detection device specifies that the upper right key 141e is pressed.

According to the above key press detection device, the following effects can be obtained.
The first key switch 512 that electrically connects the first wiring A and the second wiring B by pressing the upper key 141a, and the first wiring A and the third wiring C that are electrically connected by pressing the right key 141b. And a third key switch 514 that electrically connects the first wiring A, the second wiring B, and the third wiring C by pressing the upper right key 141e.
Thus, when the upper right key 141e is pressed, a member for pressing the first key switch 512 pressed by the upper key 141a and the second key switch 513 pressed by the right key 141b at the same time is used as the cross key 141. And the first key switch 512 and the second key switch 513 are not required. Therefore, it is possible to reduce the thickness of the mobile phone 1 including the key press detection device.

  Further, it is configured to identify that the upper right key 141e is pressed by detecting an electrical connection among the first wiring A, the second wiring B, and the third wiring C. Accordingly, it is possible to detect pressing of the upper right key 141e without providing a new wiring and electrode for specifying the upper right key 141e. Therefore, it is possible to detect the double pressing of the key without complicating the key matrix of the flexible wiring board 50.

The first wiring A includes the first terminal portion A1, the second terminal portion A2, and the third terminal portion A3, and the second wiring B includes the fourth terminal portion B1 and the fifth terminal portion B2. The third wiring C includes the sixth terminal portion C1 and the seventh terminal portion C2.
Thereby, the degree of freedom of arrangement of the plurality of terminal portions 54 formed on the plurality of wirings 53 is increased, and the plurality of terminal portions 54 can be arranged at optimum positions corresponding to the arrangement of the plurality of keys 11. It is possible to reduce the size of the mobile phone 1 provided with the press detection device.

  Further, the fourth terminal portion B1 is formed in an annular shape, the first terminal portion A1 is disposed inside the fourth terminal portion B1, and the peripheral portion of the metal dome of the first key switch 512 is in contact with the fourth terminal portion B1. In addition, the convex portion 511 of the metal dome was brought into contact with the first terminal portion A1. Therefore, even if the arrangement of the first key switch 512 is slightly shifted vertically and horizontally, the first key switch 512 is in good contact with the fourth terminal portion B1 and the first terminal portion A1, so that the first wiring A connection failure between A and the second wiring B hardly occurs.

  Further, the third terminal portion A3 is formed in an annular shape, the fifth terminal portion B2 and the seventh terminal portion C2 are arranged inside the third terminal portion A3, and the peripheral edge portion of the metal dome of the third key switch 514 is the second one. While making it contact 3 terminal part A3, the convex part 511 of the metal dome was made to contact 5th terminal part B2 and 7th terminal part C2. Therefore, even when the arrangement of the third key switch 514 is slightly shifted vertically and horizontally, the third key switch 514 makes good contact with the third terminal portion A3, the fifth terminal portion B2, and the seventh terminal portion C2. Therefore, connection failure among the first wiring A, the second wiring B, and the third wiring C hardly occurs.

Further, the fifth terminal portion B2 and the seventh terminal portion C2 are both formed in a substantially U shape, and one end side of the fifth terminal portion B2 is inserted between both end portions of the seventh terminal portion C2, so that the seventh terminal One end side of the part C2 is inserted between both end parts of the fifth terminal part B2.
Thereby, a region sandwiched between the seventh terminal portions C2 is provided on one end side of the fifth terminal portion B2, and a region sandwiched between the fifth terminal portions B2 is provided on one end side of the seventh terminal portion C2. Provided. Therefore, even if the arrangement of the third key switch 514 is shifted in the left-right direction or the up-down direction as shown in FIGS. 11A to 11E, the convex portion 511 of the metal dome is the fifth terminal portion B2. And the seventh terminal portion C2 are preferably in contact with each other, so that poor connection between the three wirings of the first wiring A, the second wiring B, and the third wiring C hardly occurs.

Next, a second embodiment of the key press detection device of the present invention will be described with reference to FIGS.
FIG. 12 is a partially enlarged cross-sectional view of the key press detection device according to the second embodiment, corresponding to FIG. 9 in the first embodiment. FIG. 13 is a diagram illustrating a state in which the third key switch 514 and the third terminal unit A3, the fifth terminal unit B2, and the seventh terminal unit C2 are in contact with each other in the key press detection device illustrated in FIG.
In the following description of the second embodiment, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.

The second embodiment differs from the first embodiment mainly in that a part of each of the fifth terminal portion B2 and the seventh terminal portion C2 is located in a region where the two insulating films 52 do not exist.
Specifically, as shown in FIG. 12, the portions of the fifth terminal portion B2 and the seventh terminal portion C2 that are located in the region where the insulating film 52 does not exist overlap with the convex portion 511 of the third key switch 514. Is formed.

The key press detection device of the second embodiment operates as follows.
As shown in FIGS. 12 and 13, when the upper right key 141e is pressed, the upper right key 141e presses the third key switch 514. Then, the third key switch 514 pressed by the upper right key 141e is such that the top portion of the metal dome is deformed to the flexible wiring board 50 side, and the convex portion 511 is formed on the insulating film 52 in the fifth terminal portion B2 and the seventh terminal portion C2. While contacting the part located in the area | region which does not exist, the peripheral part of a metal dome contacts 3rd terminal part A3.
When the convex portion 511 of the third key switch comes into contact with the portion of the fifth terminal portion B2 and the seventh terminal portion C2 that is located in the region where the insulating film 52 does not exist, the fifth terminal portion B2 and the seventh terminal portion C2 Since the portion located in the region where the insulating film 52 does not exist is not supported by the insulating film 52, the portion is pressed by the convex portion 511 and deformed (curved) toward the pressing direction of the upper right key 141e.

According to the key press detection device of the second embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained.
A part of each of the fifth terminal portion B2 and the seventh terminal portion C2 was positioned in a region where the two insulating films 52 did not exist. Thereby, when the upper right key 141e is pressed, the contact portion between the convex portion 511 of the third key switch 514 and the fifth terminal portion B2 and the seventh terminal portion C2 is curved, so that the convex portion 511 and the fifth terminal are curved. The contact area between the part B2 and the seventh terminal part C2 increases. Therefore, the connectivity between the third key switch 514 and the fifth terminal portion B2 and the seventh terminal portion C2 is improved.

As mentioned above, although each embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in the first embodiment and the second embodiment, the fifth terminal portion B2 and the seventh terminal portion C2 are both configured in a substantially U shape, but the present invention is not limited thereto. For example, the fifth terminal portion and the seventh terminal portion may each be configured in a substantially semicircular shape, and may be arranged such that their strings (straight line portions) face each other (not shown).

  Further, in the first embodiment and the second embodiment, the fourth terminal portion B1, the second terminal portion A2, and the third terminal portion A3 are formed in an annular shape, and the first terminal portion A1 is disposed inside the fourth terminal portion B1. The sixth terminal portion C1 is disposed inside the second terminal portion A2, and the fifth terminal portion B2 and the seventh terminal portion C2 are disposed inside the third terminal portion A3. However, the present invention is not limited thereto. For example, the first terminal part A1, the sixth terminal part C1, and the fifth terminal part B2 are formed in an annular shape, the fourth terminal part B1 is disposed inside the first terminal part A1, and the second terminal part A2 is connected to the second terminal part A2. You may arrange | position inside 6 terminal part C1, and may arrange | position 3rd terminal part A3 and 7th terminal part C2 inside 5th terminal part B2.

  In the first embodiment and the second embodiment, one convex portion 511 is provided on the inner surface side of the apex of the key switch 51. However, the present invention is not limited to this. That is, as shown in FIG. 14, two convex portions 511a may be provided on the inner surface of the apex of the key switch 51, and as shown in FIG. 15, the area of the convex portion 511b may be increased. .

  In addition, the key press detection device of the present invention is configured such that the three keys are pressed simultaneously and four keys are pressed simultaneously by changing the arrangement of each of the plurality of terminal portions formed on the plurality of wirings and the shape of the key switch. A predetermined operation may be assigned to quadruple pressing of keys simultaneously pressing the keys.

  In the first embodiment and the second embodiment, the key press detection device of the present invention is applied to a mobile phone, but the present invention is not limited to this. That is, the key press detection device of the present invention includes a plurality of keys such as a PHS (registered trademark: Personal Handyphone System), a portable game machine having a wireless function, a portable navigation machine, a PDA (Personal Data Assistance), and a notebook computer. You may apply to an electronic device.

It is a perspective view which shows the mobile telephone provided with the key press detection apparatus of this invention in the state which opened the operation part side housing | casing and the display part side housing | casing. It is a disassembled perspective view of the operation part side housing | casing in the mobile telephone shown in FIG. It is a top view of the operation part side housing | casing in the mobile telephone shown in FIG. It is the XX sectional view taken on the line in FIG. It is an enlarged plan view of a portion overlapping with a determination operation key in the flexible wiring board. It is a figure which shows typically arrangement | positioning of a 1st wiring, a 2nd wiring, and a 3rd wiring. FIG. 6 is a cross-sectional view taken along line YY in FIG. 5. It is a figure which shows the state which the 1st key switch deform | transformed from the state shown in FIG. 7, and the 1st key switch, the 1st terminal part, and the 4th terminal part contacted. FIG. 6 is a sectional view taken along line ZZ in FIG. 5. FIG. 10 is a diagram illustrating a state in which the third key switch is modified from the state illustrated in FIG. 9 and the third key switch is in contact with the third terminal unit, the fifth terminal unit, and the seventh terminal unit. FIG. 11A to FIG. 11D are plan views showing a state in which the key switch is displaced in the vertical and horizontal directions with respect to the flexible wiring board. It is a partial expanded sectional view of the key press detection apparatus which concerns on 2nd Embodiment. FIG. 13 is a diagram illustrating a state in which the third key switch and the third terminal unit, the fifth terminal unit, and the seventh terminal unit are in contact with each other in the key press detection device illustrated in FIG. 12. It is a figure which shows the modification of the convex part of a metal dome. It is a figure which shows the modification of the convex part of a metal dome.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile phone 2 Operation part side housing | casing 3 Display part side housing | casing 4 Connection part 50 Flexible wiring board (board | substrate)
141a Up key (first key)
141b Right key (second key)
141e Upper right key (3rd key)
512 1st key switch (1st connection part)
513 Second key switch (second connection part)
514 3rd key switch (3rd connection part)
A 1st wiring A1 1st terminal part A2 2nd terminal part A3 3rd terminal part B 2nd wiring B1 4th terminal part B2 5th terminal part C 3rd wiring C1 6th terminal part C2 7th terminal part

Claims (3)

A key press detection device that detects that a predetermined key is pressed due to a current flowing between two or more wires,
A substrate having a first wiring, a second wiring, and a third wiring;
A first key, a second key and a third key which are arranged on the substrate and are independently pressed;
A first connection portion that electrically connects the first wiring and the second wiring by pressing the first key;
A second connection portion for electrically connecting the first wiring and the third wiring by pressing the second key;
A third connection portion that electrically connects the first wiring, the second wiring, and the third wiring by pressing the third key ;
The first wiring includes a first terminal part, a second terminal part, and a third terminal part formed by exposing a part of the first wiring,
The second wiring includes a fourth terminal portion and a fifth terminal portion formed by exposing a part of the second wiring,
The third wiring includes a sixth terminal portion and a seventh terminal portion formed by exposing a part of the third wiring,
The first connection part contacts the first terminal part and the fourth terminal part by pressing the first key,
The second connection part contacts the second terminal part and the sixth terminal part by pressing the second key,
The third connecting portion contacts the third terminal portion, the fifth terminal portion, and the seventh terminal portion by pressing the third key,
One terminal part of the first terminal part and the fourth terminal part is annular, and the other terminal part is disposed inside the one terminal part,
The first connection part has a metal dome whose relative position with respect to the first terminal part and the fourth terminal part is not fixed, and when the first key is pressed, the peripheral part of the metal dome is the one of the ones. A key press detection device in which the inner surface at the apex of the metal dome contacts the other terminal portion while contacting the terminal portion . A key press detection device that detects that a predetermined key is pressed due to a current flowing between two or more wires,
A substrate having a first wiring, a second wiring, and a third wiring;
A first key, a second key and a third key which are arranged on the substrate and are independently pressed;
A first connection portion that electrically connects the first wiring and the second wiring by pressing the first key;
A second connection portion for electrically connecting the first wiring and the third wiring by pressing the second key;
A third connection portion that electrically connects the first wiring, the second wiring, and the third wiring by pressing the third key ;
The first wiring includes a first terminal part, a second terminal part, and a third terminal part formed by exposing a part of the first wiring,
The second wiring includes a fourth terminal portion and a fifth terminal portion formed by exposing a part of the second wiring,
The third wiring includes a sixth terminal portion and a seventh terminal portion formed by exposing a part of the third wiring,
The first connection part contacts the first terminal part and the fourth terminal part by pressing the first key,
The second connection part contacts the second terminal part and the sixth terminal part by pressing the second key,
The third connecting portion contacts the third terminal portion, the fifth terminal portion, and the seventh terminal portion by pressing the third key,
One terminal part of the third terminal part, the fifth terminal part, and the seventh terminal part is annular, and the third terminal part, the fifth terminal part, and the seventh terminal part are Two terminal portions different from one terminal portion are arranged inside the one terminal portion,
One terminal part of the two terminal parts has a region sandwiched between the other terminal parts,
The third connection part has a metal dome whose relative position with respect to the third terminal part, the fifth terminal part, and the seventh terminal part is not fixed, and when the third key is pressed, A key press detection device in which a peripheral portion contacts the one terminal portion, and an inner surface at an apex of the metal dome contacts the two terminal portions . The substrate is configured such that the first wiring, the second wiring, and the third wiring are sandwiched between a plurality of insulating members,
A part of each of the two terminal portions is located in a region where the plurality of insulating members do not exist,
3. The key press detection device according to claim 2 , wherein the third connection portion contacts a portion of the two terminal portions located in a region where the plurality of insulating members are not present.

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