JP4163045B2 - Coordinate input device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coordinate input device in which a surface of an operation surface functions as a speaker, and more particularly to a coordinate input device capable of outputting with a high sound pressure.
[0002]
[Prior art]
Some portable information terminals have a display panel and perform an input operation while touching the screen of the display panel with a finger or a pen. In this type of terminal, coordinate detection means formed in a transparent color is provided on the front surface of the display panel so as to be mounted on a casing larger than the display screen. In addition, other operation units and the like are provided in a portion of the casing that is not a display screen.
[0003]
Some of the portable information terminals have a built-in speaker in a casing and can emit sound based on a screen pattern. Alternatively, in a case where only a sound source is mounted in a housing, there are those that listen to sound by connecting earphones or headphones.
[0004]
[Problems to be solved by the invention]
However, in the portable information terminal equipped with the above-described conventional coordinate input device, when a speaker is mounted, it is difficult to reduce the size of the terminal because an installation space for the speaker is required. Also, a terminal equipped with only a sound source needs to wear an earphone, which is inconvenient to handle.
[0005]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a coordinate input device that can be mounted with a speaker without increasing the size of a terminal, in which various operations can be performed on a screen.
[0006]
[Means for Solving the Problems]
The present invention includes a plane-shaped coordinate detection unit in which a pair of detection sheets are stacked , a support body that supports the coordinate detection unit, and a drive unit that is fixed to the coordinate detection unit. In the coordinate input device in which sound pressure is emitted from the coordinate detection means when driven,
The coordinate detection means comprises a first end and a second end protrudes from the other of the detection sheet, said second end and said first end portion facing the opposite sides of one of the detection sheet Each part is supported by the support , and the drive means is provided at a position offset from the center of the coordinate detection means toward the first end,
The attachment portion between the first end and the support is provided with a first gap in which one of the detection sheets is easily deformed between the other detection sheet and the support , The attachment portion between the second end portion and the support body is provided with a second gap in which one of the detection sheets is easily deformed between the other detection sheet and the support body , the length dimension of the first gap, and is characterized in that it is set larger than the length of said second gap.
[0007]
In the present invention, since the coordinate detecting means can be used also as the diaphragm of the speaker, the casing is not enlarged. Note that the function is not limited to the speaker, but may be applied as an operation feeling by driving the coordinate detection means when the operator performs an input operation.
[0009]
Thus, since a part of the coordinate detection means can also be used as a part of the speaker, the number of parts can be reduced and the manufacturing cost can be suppressed.
[0012]
Even when the driving means is provided at a position biased with respect to the coordinate detecting means, the output of the sound pressure does not decrease.
[0013]
Further, the coordinate detection means is formed in a transparent color, and a display member is provided on the opposite side of the operation surface of the coordinate detection means. Accordingly, various input operations can be performed while touching an image displayed on the display member. In addition, a thin display device equipped with a sound output function similar to that of a speaker can be provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 is a plan view of an example of the coordinate input device of the present invention as viewed from the operation surface side, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, and FIG. 3 shows detection means in the coordinate detection means. FIG . 4 is a schematic diagram showing the operation of the diaphragm during sound generation, (A) is an operation diagram in the conventional form, and (B) is an operation diagram in the present embodiment.
[0015]
The coordinate input device 1 according to the present embodiment can be mounted on the front surface of a display panel such as a PDA (Personal / Digital / Assistant). Therefore, it is possible to input while operating the screen displayed on the display panel with a finger or a pen, and sound is emitted from the surface of the display panel.
[0016]
A coordinate input device 1 shown in FIG. 1 has coordinate detection means 2 formed in a rectangular shape. This coordinate detection means 2 is a resistance type tablet, and as shown in FIG. 2, a detection sheet 3 for detecting a position in the X direction is provided on the Z1 side which is the surface side, and the Z2 side of the detection sheet 3 Another detection sheet 4 for detecting the position in the Y-axis direction is provided. However, the position in the Y direction may be detected by the detection sheet 3 and the position in the X direction may be detected by the detection sheet 4.
[0017]
The detection sheet 3 is formed of a material that can be bent and deformed. Specifically, the detection sheet 3 can be selected from a film formed of a synthetic resin such as polyethylene terephthalate or a glass having a thin thickness. The detection sheet 4 can be selected from transparent glass or transparent synthetic resin. In the detection sheets 3 and 4, conductive layers are formed on one side on opposite sides. This conductive layer is formed of a transparent electrode such as ITO (indium tin oxide). Although not shown, a plurality of minute projections made of a non-conductive member are formed on the opposing surface of either the detection sheet 3 or the detection sheet 4, and the detection sheet 3 and the detection sheet 4. Is set so that a minute gap is maintained between the conductive layer of the detection sheet 3 and the conductive layer of the detection sheet 4 when not being operated.
[0018]
As shown in FIG. 1, the dimension of the detection sheet 3 in the X direction and the Y direction is longer than the dimension of the detection sheet 4 in the X direction and the Y direction. Each protrudes from the four sides. In the detection sheet 3, the portions protruding from the detection sheet 4 in the X1 and X2 directions are fixed to supports 6 a and 6 b provided at both ends on the base 5 via an adhesive or the like. In the present embodiment, the base 5 is made of a transparent synthetic resin such as PET or acrylic.
[0019]
The detection sheet 4 is provided with a drive unit 7 that functions as drive means. The drive unit 7 is provided at a position offset in the X1 direction with respect to the detection sheet 4. The drive unit 7 is, for example, a piezoelectric element, and can deform the piezoelectric element in the Z1-Z2 direction by applying a predetermined voltage to the piezoelectric element. The driving means may be a magnetic circuit in which a coil is provided on the detection sheet 4 side and a magnet or the like is provided on the base 5 side to constitute a porcelain circuit to drive the detection sheet 4 in the Z1-Z2 direction. Good.
[0020]
The coordinate detection means 2 is schematically shown in FIG. Thus, both the detection sheets 3 and 4 can be regarded as one resistor. Therefore, if a predetermined voltage is applied to both ends of the detection sheet 3 and the point P shown in FIG. 3 is pressed, the same resistance is applied to all the positions translated in the Y direction with respect to the point P. A value is obtained. When a predetermined voltage is applied to both ends of the detection sheet 4, the same resistance value is obtained at all positions translated in the X direction with respect to the point P.
[0021]
As shown in FIG. 3, only the detection sheet 3 has an end on the X1 side of 5 volts (V), an end on the X2 side has 0 V, and only the detection sheet 4 has a Y1 side of 5 V, Y2 A control unit (not shown) is controlled so that the detection sheets 3 and 4 are energized alternately so that the side becomes 0V.
[0022]
If the point P is pressed and the conductive layer of the detection sheet 4 with conductive layers of the detection sheet 3 comes into contact at point P, this time the detection sheet 3 is energized, the detection voltage Vx through the detection sheet 4 Is done. When the detection sheet 3 is de-energized and the detection sheet 4 is energized, the voltage Vy is detected via the detection sheet 3. In the control unit, coordinate data based on the voltage values Vx and Vy is stored in the storage unit in advance, and the operation position can be acquired by detecting the voltage values Vx and Vy.
[0023]
The coordinate detection means 2 is not limited to a resistance type tablet, and may be a capacitance type tablet.
[0024]
As shown in FIGS. 1 and 2, support portions 8 and 9 are provided on the base 5. The support portions 8 and 9 are each elongated in the X direction, and are fixed to the end portions of the base 5 on the Y1 side and the Y2 side. However, the support portion as described above may be formed on one surface of the base 5. The support portions 8 and 9 are formed by fixing a fixing portion 8a made of a synthetic resin on the base 5, and an elastic member 8b made of rubber or the like superimposed on the surface of the fixing portion 8a on the Z1 side. Thus, when the elastic member 8b is provided in the part which the detection sheet 4 contacts, the contact sound when the detection sheet 4 contacts can be reduced. In addition, the support part 9 is similarly comprised with the fixing | fixed part and the elastic member.
[0025]
As shown in FIG. 2, the height dimension H of the support portions 8 and 9 is formed such that a minute gap 11 is formed with the Z2 side surface of the detection sheet 4. That the gap 11, when the driving unit 7 detects the sheet 3, 4 are driven was driven, detection sheet 3 and 4 are not excessively deformed, detected with the conductive layer of the detection sheet 3 Sheet 4 is set to such an extent that it does not inadvertently contact the conductive layer .
[0026]
In the present embodiment, as shown in FIG. 2, the dimension of the gap 12a from the overlapping portion of the detection sheet 3 and the detection sheet 4 to the fixed portion of the detection sheet 3 of the support 6a is set to S1 on the X1 side. ing. On the opposite X2 side, the dimension of the gap 12b from the overlapping part to the fixed part of the detection sheet 3 of the support 6b is set to S2 shorter than the dimension S1.
[0027]
In the coordinate input device 1 formed as described above, when the drive unit 7 is energized and driven, vibration based on the driving force is transmitted to the detection sheet 4, and the detection sheet 4 together with the detection sheet 3. It is vibrated in the Z1-Z2 direction. Thus, the detection sheets 3 and 4 are caused to function as diaphragms, and sound pressure is generated from the detection sheets 3 and 4. In addition, when the drive unit 7 is provided at an end on the X1 side of the detection sheet 4, the gap on the X2 side when the gap 12a of the detection sheet 3 is deformed so as to protrude toward the Z1 side. In 12b, it is deformed so as to protrude in the Z2 direction.
[0028]
FIG. 4A shows a state in which the gap dimensions S1 and S2 are set to be the same. When the gaps 12a and 12b are set to the same dimension in this way, the drive unit 7 is When driven, on the X1 side of the detection sheet 3, the sound pressure having the phase indicated by reference sign a1 is emitted in the Z1 direction, and on the X2 side, the sound pressure having the opposite phase to that indicated by reference sign a2 is provided in the Z1 direction. It is emitted toward.
[0029]
In this way, sound pressures having the same amplitude and opposite phases are generated on the X1 side and the X2 side of the detection sheet 3, so that the sound pressures cancel each other and no sound is output or sound is output. Is weakened.
[0030]
Therefore, as shown in FIG. 4B, by setting the dimension S1 of the gap 12a on the X1 side to be longer than the dimension S2 of the gap 12b on the X2 side, the sound pressure emitted on the X1 side is the sound indicated by the symbol b1. The sound pressure generated on the X2 side has an opposite phase and smaller amplitude than the sound pressure b1, as indicated by reference numeral S2. Therefore, the sound pressure is not canceled between the X1 side and the X2 side, and a sound pressure with a large output can be emitted from the detection sheets 3 and 4.
[0032]
In an electronic device in which the coordinate input device 1 is mounted, a display panel 20 formed of liquid crystal or organic EL (electroluminescence) is installed on the back side of the coordinate input device 1. The display panel 20 can display still images and moving images, and various operations can be input based on the images. In this embodiment, the detection sheet 3,4, conductive So及 beauty base 5 of the detection sheet 3 and 4, since all are transparent form, even as the display panel 20 is provided on the back side of the base 5 The image displayed on the display panel 20 is visible from the operation surface 1A side. The display panel 20 may be installed between the detection sheet 4 and the base 5.
[0033]
Therefore, in the electronic device on which the coordinate input device 1 and the display panel 20 are mounted, various operations can be input according to the screen output to the display panel 20, and sound can be output from the surface of the display panel 20. . Therefore, when the electronic apparatus is viewed from the front, the external dimensions can be made closer to the size of the display panel 20, and the apparatus can be reduced in size and thickness. Further, since the detection sheets 3 and 4 can also be used as a speaker, the number of parts can be reduced and the manufacturing cost can be reduced.
[0034]
In the coordinate input device 1 described above, the function as a so-called speaker has been described. However, the present invention is not limited to this and can be used as a feedback function. For example, in an electronic device such as a PDA, the feedback function is the detection sheet 3 when the cursor reaches the menu display position on the screen, exceeds the boundary of the menu display, or reaches the icon display. And 4 are vibrated so that the operator's hand or finger can feel some force. Therefore, the operator can recognize by hand touch that the cursor has reached each position without relying only on vision.
[0038]
【The invention's effect】
In the present invention described above, the detection sheet of the coordinate detection means can also be used as the diaphragm of the speaker. Even if the drive unit is provided on one side, the output of the sound pressure is not reduced.
[Brief description of the drawings]
FIG. 1 is a plan view when a coordinate input device of the present invention is viewed from an operation surface side;
FIG. 2 is a cross-sectional view taken along line 2-2 in FIG.
FIG. 3 is a circuit diagram showing detection means in the coordinate detection means;
FIGS. 4A and 4B are operation explanatory diagrams when sound pressure is output, in which FIG. 4A is before a countermeasure for preventing a decrease in output, and FIG. 4B is a countermeasure after a countermeasure for preventing a decrease in output;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coordinate input device 2 Coordinate detection means 3, 4 Detection sheet 5 Base 6a, 6b Support body 7 Drive part (drive means)
8, 9 Support portions 12a, 12b Gap 20 Display panel (display member)

Claims (2)

A coordinate detection means of the pair of detection sheet plane shape superimposed, a support for supporting the coordinate detection hand stage, the fixed drive means are provided on the coordinate detection means, said driving means is driven In the coordinate input device in which sound pressure is emitted from the coordinate detection means when
The coordinate detection means comprises a first end and a second end protrudes from the other of the detection sheet, said second end and said first end portion facing the opposite sides of one of the detection sheet Each part is supported by the support , and the drive means is provided at a position offset from the center of the coordinate detection means toward the first end,
The attachment portion between the first end and the support is provided with a first gap in which one of the detection sheets is easily deformed between the other detection sheet and the support , The attachment portion between the second end portion and the support body is provided with a second gap in which one of the detection sheets is easily deformed between the other detection sheet and the support body , The coordinate input device according to claim 1, wherein a length dimension of the first gap is set larger than a length dimension of the second gap. The coordinate detection means is formed on the transparent color, the coordinate detection means of the coordinate input device according to claim 1, wherein are provided so as to overlap the display member on the opposite side of the operation surface.

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