JP5350861B2 - Pressure detection unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure detection unit of high responsiveness to an information input operation. <P>SOLUTION: The pressure detection unit 20 includes a first substrate 21; a second substrate 22 arranged facing the first substrate 21; a pressure detecting part 23 provided between the first substrate 21 and the second substrate 22 to detect the mutual pressing force of the first substrate 21 and second substrate 22; and an initial load applying part 30 provided across the first substrate 21 and the second substrate 22 and biasing the first substrate 21 and the second substrate 22 to the side of the pressure detecting part 23 to apply an initial load. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pressure detection unit used in an information input device or the like that enables information input by a user pressing a panel member.

  As an information input device including a panel member having an information input function, a device in which a touch panel is arranged on a liquid crystal display is widely used. Some digital cameras having a liquid crystal monitor are provided with a panel member that can detect a contact position and a pressing force on the upper surface of the liquid crystal monitor, and give different instructions depending on the strength of pressing at the time of contact (for example, Patent Document 1).

  Further, the display device of the car navigation device is configured to include a touch panel on the surface portion of the liquid crystal display via a pressure detection unit, and the pressure applied to the touch panel is detected by the pressure detection unit based on the pressing time, the number of times of pressing, and the like. There are those that give different instructions (see, for example, Patent Document 2). In addition to the touch panel, a pressure sensor is arranged under the operation button for inputting characters on the mobile terminal, and the pressure when the operation button is pressed is measured and input according to the measured pressure value. There is one in which the size of the character is changed (see, for example, Patent Document 3).

JP-A-11-355617 JP 2006-39745 A JP 2004-177994 A

  As shown in FIG. 11, the pressure-sensitive sensor for detecting the pressing force of the panel member usually has a problem that the detection value (resistance value) has a wide error range and sensitivity is not constant particularly when detecting a light load. . For this reason, detection values for light loads with a wide error range are not often used, and detection values for predetermined loads (loads from the arrows in FIG. 11) are mainly used and controlled. However, in this case, the light load at the time of initial pressing of the panel member does not contribute to the information input at all, and then the information is input only after a load in the range of the stable detection value is given. Can not do.

  Accordingly, an object of the invention according to the present application is to obtain a pressure detection unit having good responsiveness to an information input operation.

A first characteristic configuration of a pressure detection unit according to the present invention is provided between a first substrate, a second substrate disposed opposite to the first substrate, and the first substrate and the second substrate, A pressure detection unit configured to detect a pressing force between the first substrate and the second substrate; the first substrate; and the second substrate; and the first substrate and the second substrate. An initial load applying portion for applying an initial load by urging the pressure detecting portion, and the thickness of the initial load applying portion is larger than the thickness of the pressure detecting portion in a free state where no external force is applied. Is also set to be thin .

With this configuration, the initial load applying unit reduces the distance between the first substrate and the second substrate and reduces the thickness of the pressure detecting unit in the non-pressurized state, thereby applying the initial load to the pressure detecting unit. . Even when a light load force is detected, an initial unstable detection value is automatically excluded because a load is applied to the pressure detection unit in advance. This also makes the error range of the detection value (resistance value) with respect to the load extremely small, and the pressure measurement accuracy can be improved.
Further, the pressure detection unit and the member for applying an initial load to the pressure detection unit are integrally incorporated in the pressure detection unit, and an information input device having a panel member having a contact type information input function is manufactured. In this case, there is no need to specially arrange a structure corresponding to an elastic member that applies an initial load to the information input device itself. Therefore, the structure of the information input device can be simplified. Further, the member that applies the initial load attracts the first substrate and the second substrate to apply the initial load to the pressure detection unit. The thickness of the pressure detection unit can be reduced as compared with the case of doing so.

  A second characteristic configuration of the information input device according to the present invention is that the initial load applying unit is an elastic member connected to the first substrate and the second substrate.

  With this configuration, the initial load applying portion can be easily configured with an elastic member. Examples of the elastic member used as the initial load applying unit include various members such as an adhesive, a double-sided adhesive, rubber, a tension coil spring, and a leaf spring.

According to a third characteristic configuration of the pressure detection unit according to the present invention, the pressure detection unit is disposed between a pair of electrodes disposed between the first substrate and the second substrate, and the pair of electrodes. lies in having a conductive pressure-sensitive ink electrical characteristics due to a load from the outside is changed.

  With this configuration, the pair of electrodes and the conductive pressure-sensitive ink constituting the pressure detection unit can be applied to the first substrate and the second substrate using a printing method, and the thickness of the pressure detection unit can be reduced. Therefore, as a result, the entire pressure detection unit can be reduced in thickness.

According to a fourth characteristic configuration of the pressure detection unit of the present invention, the pressure detection unit includes a pair of electrodes disposed on either the first substrate or the second substrate, and the first substrate or the first substrate. It has the point which has the electroconductive pressure sensitive ink which is arrange | positioned so that the said pair of electrodes may be covered on the other of 2 board | substrates, and an electrical property changes with the load from the outside.

  With this configuration, the conductive pressure-sensitive ink can be applied using a printing method so as to cover a pair of electrodes arranged on one substrate constituting the pressure detector, and the electrode layer becomes one layer. The thickness of the pressure detection unit is further reduced, and as a result, the pressure detection unit can be made thinner. In addition, comb electrodes can be used as a pair of electrodes disposed on one substrate to increase the contact area between the electrode and the conductive pressure-sensitive ink, thereby facilitating sensitivity adjustment.

  A fifth characteristic configuration of the pressure detection unit according to the present invention is provided on at least one of the outer surface of the first substrate and the outer surface of the second substrate, and the installation area thereof is the first of the pressure detection unit. The load transmission part formed so that it may become below the contact area with one board | substrate or the said 2nd board | substrate is provided.

  With this configuration, when an external load is applied to the pressure detection unit, the load transmission unit supports the pressure detection unit and receives the load from the outside without being dispersed, and the load is reliably received by the pressure detection unit. To communicate. Thus, since the pressure detection part is pressed reliably, the pressure measurement accuracy of the pressure detection unit can be improved.

  The sixth characteristic configuration of the pressure detection unit according to the present invention is that the cross-sectional area is reduced as the load transmitting portion is further away from the outer surface on which the first substrate or the second substrate is installed.

  With this configuration, the load transmission unit allows a change in posture between the pressure detection unit and an external member (such as a panel member) that presses the pressure detection unit to some extent. Therefore, when the posture change between the pressure detection unit and the external member is small, the load transmission unit can suppress the dispersion of the external load to other than the pressure detection unit 23.

It is a perspective view of the information input device which has arranged the pressure detection unit concerning the present invention. It is II-II sectional drawing of FIG. It is a figure which shows arrangement | positioning in the information input device of the pressure detection unit which concerns on this invention. FIG. 3 is an enlarged view of the vicinity of a pressure detection unit in FIG. 2. It is a figure which shows Embodiment 3 of the pressure detection unit which concerns on this invention. It is a figure which shows the operation state of Embodiment 3 of the pressure detection unit which concerns on this invention. It is a figure which shows the sample used for the effect confirmation test. It is a graph which shows the relationship between the resistance value and load in the Example (sample S1-S15) of this invention. It is a graph which shows the relationship between the resistance value in a comparative example (samples S16-S30) and a load. It is a graph which shows the relationship between the variation coefficient of resistance value and load in samples S1 to S30. It is a graph which shows the relationship between the load and resistance value in a pressure sensor.

  Hereinafter, a first embodiment of a pressure detection unit 20 according to the present invention will be described with reference to the drawings.

Embodiment 1
First, the configuration of the information input device 1 to which the pressure detection unit 20 according to Embodiment 1 of the present invention is mounted will be described with reference to FIGS. As shown in FIG. 1, the information input device 1 includes a housing 2 having an opening 2 </ b> A and the like formed on the front surface, a panel member 4 having a contact-type information input function, and a pressing operation force on the panel member 4. There is provided pressure detection means including a pressure detection unit 20 for detecting.

  As shown in FIG. 4, the pressure detection means processes the pressure detection unit 20 provided across the panel member 4 and the support portion 2 b of the housing 2 and the output signal from the pressure detection unit 20. The signal processing circuit is not configured. For example, if the pressure detection means has a so-called touch input function that detects an XY coordinate serving as an operation position based on a user's touch operation on the panel member 4, the convenience of the apparatus is enhanced. A device having a touch input function can be selected from a resistance film method, a capacitance method, an electromagnetic induction method, and the like.

  Next, the configuration of the pressure detection unit 20 will be described. As shown in FIG. 4, the pressure detection unit 20 is sandwiched between a first substrate 21, a second substrate 22 disposed to face the first substrate 21, and the first substrate 21 and the second substrate 22. In addition to the pressure detection unit 23, a member 30 that applies an initial load to the pressure detection unit 23 is provided across the first substrate 21 and the second substrate 22. The pressure detector 23 detects the pressing force between the first substrate and the second substrate.

  As shown in FIGS. 3 and 4, the pressure detection unit 20 used in the information input device 1 includes a frame-shaped first substrate 21 and a frame-shaped second substrate 22 arranged to face the first substrate 21. ing. The inner diameters of the frame-like first substrate 21 and the second substrate 22 are adjusted to the dimensions of the opening 2A, and the outer diameter is adjusted to an XY coordinate detection device (not shown) provided separately. On the surface of the first substrate 21 facing the second substrate 22, the upper electrode 21a is arranged in a frame shape. On the surface of the second substrate 22 facing the first substrate 21, the lower electrode 22a is arranged in a frame shape so as to face the upper electrode 21a. A dot-shaped upper pressure-sensitive ink 23a is disposed at the corner portion and the peripheral portion of the first substrate 21 so as to cover the upper electrode 21a. Similarly, in the case of the second substrate 22, the dot-like lower pressure-sensitive ink 23b covers the lower electrode 22a at the corner portion and the peripheral portion of the second substrate 22 and faces the upper pressure-sensitive ink 23a. Is arranged. The pressure sensitive ink electrode is designed to be slightly smaller than the pressure sensitive ink print size. However, the dimensions and the like are not particularly limited as long as the electrode portions are considered not to directly contact the electrodes disposed on the opposing substrate. The pressure detection unit 20 is attached to the opening 2A by sticking the second substrate 22 on the support 2b with, for example, an adhesive (not shown).

  The pressure detection unit 23 includes an electrode 21a formed on the first substrate 21, an electrode 22a formed on the second substrate 22 so as to face the electrode 21a, and a pressure sensitive formed on the electrode 21a. The ink 23a and the pressure-sensitive ink 23b formed on the electrode 22a so as to face the pressure-sensitive ink 23a.

  The initial load applying unit 30 includes a tension member 30 a and is disposed in a region where the first substrate 21 and the second substrate 22 are opposed to each other and on the peripheral portion of the pressure detecting unit 23. The tension member 30a is provided in a state sandwiched between the first substrate 21 and the second substrate 22, and is configured to bias the first substrate 21 and the second substrate 22 toward the pressure detection unit 23. ing. The tension member 30a is, for example, an inelastic spacer (including an adhesive layer with the substrates 21 and 22 or a single adhesive) having a thickness smaller than that of the pressure detection unit 23, and the first substrate 21 or the second substrate. When the deformation of 22 is permitted, the pressure detection unit 23 to which the initial load is applied is further compressed by the first substrate 21 or the second substrate 22 to detect the pressing force. Further, the tension member 30a may be a sticky adhesive or double-sided adhesive material having elasticity, or various elastic members such as rubber, tension coil springs, leaf springs, etc. that are set to exert a tensile force. It may be. In FIG. 4, the pressure detection unit 23 and the initial load application unit 30 are separated from each other, but the pressure detection unit 23 and the initial load application unit 30 may partially contact each other.

  Here, the tension member 30 a is configured such that its thickness is smaller than the thickness of the pressure detection unit 23 in the free state. A force for maintaining the original thickness acts on the arranged tension member 30a, and this force acts in a direction in which the first substrate 21 and the second substrate 22 are brought close to each other. Thus, by reducing the distance between the first substrate 21 and the second substrate 22 and reducing the thickness of the pressure detection unit 23 in the non-pressurized state, an initial load is applied to the pressure detection unit 23 as a result. ing.

  Hereinafter, the operation of the pressure detection unit 20 attached to the information input device 1 will be described. In the information input device 1, the upper electrode 21a and the lower electrode 22a are connected to a connector (not shown), and the connector is connected to a load detection unit (not shown) built in the information input device. .

  A change in resistance applied to the upper pressure-sensitive ink 23a and the lower pressure-sensitive ink 23b of the pressure detection unit 23 of the pressure detection unit 20 when the panel member 4 is pressed is detected. By detecting this change in resistance, it is possible to detect the external force applied to both pressure-sensitive inks 23a and 23b, and to detect the load on the panel member 4.

  At this time, since the pressure detection unit 20 includes the tension member 30a, an initial load is applied to the pressure detection unit 23 before the panel member 4 is pressed. Since the load range with large detection variation from no load to the stable detection load can be canceled, the value detected by the pressure detection unit 23 can be used as it is for the control of information input when the panel member 4 is subsequently pressed. it can.

  The first substrate 21 and the second substrate 22 of the pressure detection unit 20 are, for example, films or the like, and the material can be used for a flexible substrate, for example, polyethylene terephthalate, polystyrene resin, polyolefin resin, ABS resin. And general-purpose resins such as AS resin, acrylic resin, and AN resin. In addition, general-purpose engineering resins such as polystyrene resins, polycarbonate resins, polyacetal resins, polycarbonate-modified polyphenylene ether resins, polybutylene terephthalate resins, ultrahigh molecular weight polyethylene resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxide resins, Super engineering resins such as polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin, and polyallyl heat-resistant resin can also be used.

  As a material of the upper electrode 21a and the lower electrode 22a of the pressure detection unit 23, a metal such as gold, silver, copper, or nickel, or a conductive paste such as carbon can be used. Examples of these forming methods include printing methods such as screen printing, offset printing, gravure printing, and flexographic printing, and a photoresist method. The upper electrode 21a and the lower electrode 22a can be formed by attaching a metal foil such as copper or gold. Further, the upper electrode 21a and the lower electrode 22a may be formed by forming an electrode pattern with a resist on an FPC plated with a metal such as copper and etching a portion of the metal foil that is not protected by the resist. it can. The electrodes may be formed by combining or laminating the formation methods and materials listed here.

  The composition constituting the upper pressure-sensitive ink 23a and the lower pressure-sensitive ink 23b of the pressure detection unit 23 is made of a material whose electric characteristics such as an electric resistance value change according to an external force. As the composition, for example, a quantum tunnel phenomenon composite material (trade name “QTC”) manufactured by Peratech of England can be used. The upper pressure-sensitive ink 23a and the lower pressure-sensitive ink 23b can be disposed on the first substrate 21 and the second substrate 22 by application. As a method for applying the upper pressure-sensitive ink 23a and the lower pressure-sensitive ink 23b, a printing method such as screen printing, offset printing, gravure printing, or flexographic printing can be used. The pressure sensitive ink may be applied to only one side of the first substrate 21 or the second substrate 22.

  The pressure detection unit 20 is attached to the lower surface of the panel member 4 of the information input device 1 with an adhesive layer such as an adhesive such as glue or a double-sided adhesive tape, and is concealed in the decorative portion of the peripheral edge portion 4A of the panel member 4. Are arranged in at least one. Therefore, each member constituting the pressure detection unit 20 is not limited to being made of a transparent material, and may be made of a colored material.

[Embodiment 2]
In the first embodiment, the pair of electrodes 21a and 22a disposed between the first substrate 21 and the second substrate 22 and the pressure detection unit 23 in which pressure-sensitive ink is disposed between the pair of electrodes have been described. However, the pressure detection unit 23 covers the pair of electrodes disposed on either the first substrate 21 or the second substrate 22 and the other of the first substrate or the second substrate. The structure to arrange | position may be sufficient. In this case, since the electrode layer becomes one layer, the thickness of the pressure detection unit 23 is further reduced, and as a result, the pressure detection unit 20 can be thinned. In this case, a signal in a desirable detection range can be obtained by controlling the contact area with the pressure-sensitive ink member by forming a pair of electrodes in a comb shape, a spiral shape, or the like.

[Embodiment 3]
As shown in FIG. 5, bumps 24 a may be provided on the outer surface of the second substrate 22 as the load transmission unit 24. The installation area of the bump 24a is formed to be equal to or less than the contact area of the pressure detection unit 23 with the second substrate. When an external load is applied to the pressure detection unit 20, the bump 24a supports the pressure detection unit 23 from below, and the load is concentrated and transmitted to the pressure detection unit 23 (FIG. 6). As the configuration of the bump 24a, a thermosetting resin or an ultraviolet curable resin is disposed and cured by printing or coating, a film or a resin plate, PE foam, There are foams such as urethane foam. The bumps 24 a may be provided on the outer surface of the first substrate 21, or may be provided on both the outer surfaces of the first substrate 21 and the second substrate 22. Here, the height of the bump 24a is, for example, 50 μm to 200 μm (including the thickness of the adhesive layer for bonding to the second substrate 22). The bumps 24a are preferably arranged on the back side (directly below) where the pressure detection unit 23 is provided. Thus, the upper pressure-sensitive ink 23a and the lower pressure-sensitive ink 23b can be reliably pressed against each other, and the pressure measurement accuracy of the pressure detection unit 20 can be improved.

[Embodiment 4]
As shown in FIG. 5, the bump 24 a is preferably formed so that the cross-sectional area decreases as the distance from the outer surface of the installed second substrate 22 increases. This allows a certain degree of posture change between the pressure detection unit 23 and an external member (for example, a panel member) that presses the pressure detection unit 23. Therefore, when the change in posture between the pressure detection unit 23 and the external member is small, the bumps 24a suppress the dispersion of external loads other than the pressure detection unit 23. The bump 24a may be a non-elastic member or an elastic member.

[Another embodiment]
(1) In the first embodiment, the pressure detection unit 23 has been described using the pressure detection unit 23 that is composed of a pair of electrodes and two layers of pressure-sensitive inks 23a and 23b sandwiched between the electrodes. The configuration of 23 is not particularly limited as long as the pressing force can be detected, and the pressure-sensitive ink may be a single layer. Further, the shape of the pressure-sensitive ink is not limited to a dot shape, and may be a circle, a rectangle, or a frame shape in plan view. The electrodes of the pressure detection unit 23 are not necessarily arranged in a frame shape, and may be individually arranged on the frame-shaped substrate.

(2) In Embodiment 1, the upper pressure-sensitive ink 23a or the lower pressure-sensitive ink 23b is disposed at each corner of the first substrate 21 or the second substrate 22, but the present invention is not limited to this. The upper pressure-sensitive ink 23 a or the lower pressure-sensitive ink 23 b may be arranged so as to be scattered along the edge of the first substrate 21 or the second substrate 22. As shown in FIG. 3, the upper pressure-sensitive ink 23a and the lower pressure-sensitive ink 23a may be arranged symmetrically and at equal intervals. In this way, if the apparatus has a function of detecting the XY coordinates as the operation position based on the user's touch operation on the panel member 4, the detection of the XY coordinates is facilitated, and the convenience of the apparatus is improved. Rise.

(3) In the first embodiment, the pressure detection unit 20 is attached to the lower surface of the panel member 4. However, the pressure detection unit 20 may be attached to the support portion 2 b of the housing instead of the panel member 4. Good.

(Pressure measurement accuracy evaluation test)
Next, the pressure detection unit 20 provided with a tension member 30 a whose thickness is made thinner than the thickness of the pressure detection unit 23 as an initial load applying unit 30 in a region facing the first substrate 21 and the second substrate 22. The result of the effect confirmation test performed using will be described.

  Here, as an embodiment of the present invention, as shown in FIG. 7, the pressure detection unit 23 is arranged between an upper film (first substrate) 21 and a lower film (second substrate) 22, a silver electrode 21 a, The ink 23a, carbon printing, and silver electrode 22b were arranged in this order. Fifteen samples S1 in which tension members 30a (glue printing) having a smaller thickness than the thickness of the pressure detector 23 (the total thickness of the silver electrodes 21a and 22a, the pressure-sensitive ink 23a, and the carbon) are arranged. -S15 was produced. Further, as a comparative example, a double-sided tape in which the same pressure detection unit 23 as that of the embodiment of the present invention is disposed and the thickness is larger between the upper film 21 and the lower film 21 than the thickness of the pressure detection unit 23. Fifteen samples S16 to S30 on which (an acrylic adhesive was applied on both sides) were prepared.

  The silver electrodes 21a and 22a have a diameter of 4 mm and a thickness of 10 μm, the pressure-sensitive ink 23 a has a diameter of 3 mm and a thickness of 20 μm, the carbon has a diameter of 3 mm and a thickness of 10 μm (the thickness of the pressure detector 23 is 50 μm in total), respectively. Printed in a substantially circular shape. The thickness of the tensile member 30a (glue printing) of the samples S1 to S15 was 30 μm, and the thickness of the double-sided tape of the samples S16 to S30 was 70 μm. For the pressure-sensitive ink 23a, "QTC" (trade name) manufactured by Peratech of England was used. The upper film 21 is a PET film with a thickness of 50 μm, and the lower film 22 is a laminate of two PET films with a thickness of 50 μm and a PET film with a thickness of 38 μm. Silver electrodes 21a and 22a are printed on a PET film having a thickness of 50 μm for the upper film 21 and the lower film 22, and bumps (not shown) having a diameter of 1 mm and a height of 100 μm are arranged on the 38 μm thickness of the lower film 22. did.

  After placing each sample S1 to S30 on the test bench, a weight is placed in the central portion C where the pressure sensitive ink 23a of each sample S1 to S30 is located, and the resistance value is measured three times for each sample. did. This operation was repeated a plurality of times while changing the weight of the weight, and the resistance value against the load applied to the pressure-sensitive ink was measured.

  FIG. 8 is a graph showing the relationship between resistance values (average values of resistance values measured three times) and loads in samples S1 to S15, and FIG. 9 shows resistance values (resistance values measured three times) in samples S16 to S30. It is a graph which shows the relationship between an average value) and a load.

  In the examples of the present invention (samples S1 to S15), as shown in FIG. 8, when the load was about 100 gf or more, all the samples showed substantially the same resistance value. On the other hand, in the comparative example (samples S16 to S30), as shown in FIG. 9, the resistance value of each sample varied as the load decreased. This variation in resistance value is particularly noticeable when the load is smaller than 200 gf. In addition, when the load was less than 150 gf, the resistance value could not be measured.

  FIG. 10 is a graph showing the relationship between the coefficient of resistance variation and the load in samples S1 to S30. Here, the coefficient of variation is obtained by dividing the standard deviation by the arithmetic average, and the larger the coefficient of variation, the greater the variation in resistance value with respect to the load.

  In the examples of the present invention (samples S1 to S15), as shown in FIG. 10, even when the load applied to each sample was small, the coefficient of variation of the resistance value for each sample load was very small. . On the other hand, in the comparative examples (samples S16 to S30), the coefficient of variation of the resistance value of each sample increased as the load decreased. This increase in coefficient of variation is particularly noticeable when the load is less than 200 gf.

  From the above test results, by arranging the tension member 30a thinner than the thickness of the pressure detection unit 23 between the upper fill 21 and the second substrate 22, the pressure can be measured even when the external load is small. It was confirmed that the accuracy could be improved.

  It is to be noted that, by appropriately combining any of the various embodiments, the effects possessed by them can be produced.

  The pressure detection unit according to the present invention is effectively used in electronic devices such as a mobile phone, a smartphone, a PDA, a car navigation device, a digital camera, a digital video camera, a game machine, and a tablet. It can be used to improve

DESCRIPTION OF SYMBOLS 1 Information input device 2 Case 4 Panel member 20 Pressure detection unit 21 1st board | substrate (upper film)
22 Second substrate (lower film)
23 Pressure detecting unit 24 Load transmitting unit 24a Bump 30 Initial load applying unit 30a Tensile member

Claims (6)

A first substrate;
A second substrate disposed opposite the first substrate;
A pressure detection unit that is provided between the first substrate and the second substrate and detects a pressing force between the first substrate and the second substrate;
An initial load applying unit that is provided across the first substrate and the second substrate and applies an initial load by urging the first substrate and the second substrate toward the pressure detection unit; ,
A pressure detection unit in which a thickness of the initial load applying portion is set to be thinner than a thickness of the pressure detection portion in a free state where no external force is applied .   The pressure detection unit according to claim 1, wherein the initial load applying unit is an elastic member connected to the first substrate and the second substrate. The pressure detecting unit is disposed between the pair of electrodes between the first substrate and the second substrate, and between the pair of electrodes, and a conductive sensation in which electrical characteristics change due to an external load. The pressure detection unit according to claim 1, further comprising pressure ink. The pressure detection unit is disposed so as to cover the pair of electrodes on one of the first substrate and the second substrate and the other of the first substrate and the second substrate. The pressure detection unit according to claim 1, further comprising : a conductive pressure-sensitive ink whose electrical characteristics are changed by an external load.   It is provided on at least one of the outer surface of the first substrate and the outer surface of the second substrate, and the installation area thereof is equal to or smaller than the contact area of the pressure detection unit with the first substrate or the second substrate. The pressure detection unit as described in any one of Claims 1-4 provided with the formed load transmission part.   The pressure detection unit according to any one of claims 1 to 5, wherein the load transmission unit has a smaller cross-sectional area as the distance from the outer surface of the first substrate or the second substrate increases.

Images