JP2006301979A - Pen type input device and sensor element used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pen type input device for satisfactorily detecting a pen pressure by using a compact and highly sensitive pressure sensitive sensor. <P>SOLUTION: This pen type input device is provided with a pen main body 10, a pen core 12 mounted on the pen main body 10 and a pen pressure sensor part 100 where an electrode pattern is formed on the substrate for detecting the pen pressure of a user to be acquired from the pen core 12. The sensor element of the stroke pressure sensor part 100 is provided with a pressure sensitive conductive elastomer oppositely to the electrode pattern, and the resistance value of the electrode pattern is changed by deforming the pressure sensitive conductive elastomer according to a pressure obtained from the pen core 12 so that the stroke pressure can be detected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to, for example, a pen-type input device that communicates with a computer device, and a high-sensitivity sensor element and the like used therefor.

  In recent years, for example, a pen-type input device has attracted attention as an information input device for a computer device. In this pen type input device, in addition to the printing function of an original pen, there is known a device equipped with an electronic device that digitally records the content printed with the pen (see, for example, Patent Document 1). In a conventional pen-type input device, position information provided on a paper surface is read by an optical sensor, and various types of information such as used time, pen tilt, and pen serial information are acquired. Further, Patent Document 1 discloses a pen-type input device provided with a writing pressure sensor that detects a state in which a pen tip is pressed against a paper surface by a user's writing operation on the paper surface.

  In a pen pressure sensor used in such a pen-type input device, conventionally, for example, a first portion having a region printed with conductive carbon ink and a second portion in which comb-like electrodes are alternately arranged from the left and right. A film substrate having a pattern printed thereon was used. Then, the film substrate is folded and the first portion and the second portion are overlapped. By pressing the film substrate from the outside with a pen core, the writing pressure was measured by changing the contact state in which the conductive carbon ink contacts the comb-like electrode.

JP 2003-308163 A

  In such a small pressure sensor used in the conventional pen-type input device, due to its structure, if a load is continuously applied repeatedly, the material is destroyed and the durability is very low. For example, there is a case where high durability is required such that the performance can be maintained even when the repetitive load of 200 gf is 10 million times or more, and it has been difficult to satisfy the demand with the structure of the conventional compact pressure-sensitive sensor.

  In addition, the small pressure-sensitive sensor used in the conventional pen-type input device can only obtain a sensitivity close to the binary value of on or off due to its structure. For this reason, it has not been possible to function sufficiently for a specification that covers a dynamic range of 0 to 500 gf, for example. Furthermore, since the information on the user's writing pressure varies from person to person, there is a new demand for using it for, for example, identification or authentication of a person. It is difficult to respond to such a request with a conventional compact pressure-sensitive sensor that is difficult to acquire an intermediate value and has low sensitivity.

The present invention has been made to solve the technical problems as described above, and the object of the present invention is to satisfactorily detect writing pressure using a small and highly sensitive pressure sensitive sensor. The object is to provide a pen-type input device.
Another object of the present invention is to provide a pen-type input device and a sensor element that are highly durable even during repeated use.

  For this purpose, the pen-type input device to which the present invention is applied includes a main body, a pen core attached to the main body, an electrode pattern formed on a substrate, and a user's writing pressure obtained from the pen core. The sensor element is provided with a pressure-sensitive conductive elastomer opposite to the electrode pattern, and the pressure-sensitive conductive elastomer is deformed by the pressure obtained from the pen core to change the resistance value between the electrode patterns. It is characterized in that the user's writing pressure is detected by changing it.

Here, the sensor element can be characterized in that a cover lay is provided to ensure a gap between the electrode pattern and the pressure-sensitive conductive elastomer in a state where the user's writing pressure is not applied. The cover lay of the sensor element can be characterized by being formed of a hard insulating material on the outer periphery of the electrode pattern.
In addition, this sensor element is characterized in that a pressure-sensitive conductive elastomer is laminated on the pressure side of the pen core on the pressure-sensitive conductive elastomer. Even when a conductive elastomer is used, it is preferable in that a sensor structure that maintains high durability can be provided.
Furthermore, it is possible to provide a pressure element that holds the pen core and transmits a user's writing pressure obtained from the pen core to the pressure-sensitive conductive elastomer.

  From another point of view, the pen-type input device to which the present invention is applied includes a main body, a pen core attached to the main body, an electrode pattern formed on a substrate, and a user's writing pressure obtained from the pen core. The sensor element includes a first layer made of a pressure-sensitive conductive elastomer on the side facing the electrode pattern, and a protective member for protecting the pressure-sensitive conductive elastomer on the pressure side by the pen core. The second layer is provided by being laminated.

Here, this sensor element can be characterized in that a cover lay for ensuring a gap between the electrode pattern and the first layer at the time of no pressure is provided around the detection portion by the electrode pattern.
The pressure sensor may further include a pressure element that holds the pen core and transmits the user's writing pressure obtained from the pen core by contacting the second layer.
Further, the pressure element holds the pen core between the opening provided toward the tip end side of the pen core, the pressure surface provided toward the second layer side, and the opening and the pressure surface. A pen core holding part is provided.

Furthermore, the pressurizing element is made of a hard material, and the second layer of the sensor element has elasticity and is more durable than the first layer with respect to repeated load caused by contact of the pressurizing element. It can be characterized by being a protection member which consists of.
In addition, the first layer and the second layer of the sensor element are not bonded to a portion where the pressure element is in contact with the second layer, and a peripheral portion away from the contact portion is bonded. Is preferable in that a good writing pressure can be detected even when the writing pressure is generated from an oblique direction.

  On the other hand, when the present invention is grasped from a sensor element, the present invention is a sensor element provided in a pen-type input device for measuring a writing pressure by a user, and a substrate and an electrode pattern formed on the substrate. A pressure-sensitive conductive elastomer which is provided opposite to the electrode pattern and deforms when pressed, a protective member laminated on the pressure-side of the pressure-sensitive conductive elastomer, and the pressure-sensitive A coverlay that secures a predetermined gap between the electrode pattern and the conductive pattern when the conductive elastomer is not pressurized, and pressurizes the pressure-sensitive conductive elastomer against the electrode pattern, It is characterized in that a change in resistance value between electrode patterns due to pressure deformation of the pressure-sensitive conductive elastomer is detected.

Here, the coverlay is provided on the outer periphery of the electrode pattern, and one surface is bonded to the substrate, and the other surface is bonded to the pressure-sensitive conductive elastomer.
In addition, the pressure-sensitive conductive elastomer and the protective member can be characterized in that a peripheral portion of a region where the electrode pattern is formed is bonded.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the pen-type input device which can detect a user's writing pressure favorably using a small and highly sensitive pressure-sensitive sensor.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing the overall configuration of a pen-type input device to which the present embodiment is applied. The pen-type input device shown in FIG. 1 includes a pen body 10 that is one of portable electronic devices, and a cap 30 that functions as a pen tip protection or switch for the pen body 10.
The pen body 10 is entirely covered with an exterior case 11. A strap hole 19 for attaching the strap 40 is provided at the rear end of the pen body 10. The pen body 10 has an outer shape that gradually decreases in diameter as it goes from the intermediate portion to both ends, and is formed so as to become familiar with the hand when the user grips it. The pen body 10 is provided with an indicator unit 24. The indicator unit 24 includes an LED (Light Emitting Diode), a liquid crystal panel, and the like, and displays, for example, a remaining battery level.

In addition to the writing function similar to that of a normal ballpoint pen, the pen body 10 configured in this way reads and stores the written content, for example, optically, as will be described later, and an external computer device as necessary. It has an electronic function to communicate.
The cap 30 is attached to a cap body 31 for covering the pen tip of the pen body 10, a notch 32 formed by cutting out a part of the edge 31 a of the cap body 31, and an outer surface 31 c of the cap body 31. And a clip 34 for holding paper or the like.
When the pen body 10 is not used, as shown in FIG. 1, the tip of the pen is covered with a cap 30 to protect the pen tip and prevent the pen ink from drying. When the pen body 10 is used, the cap 30 is removed and sufficiently inserted and engaged with the rear end of the pen body 10 to hold the cap 30 with the pen body 10 and prevent the cap 30 from being lost. be able to.

  Here, about the attachment of the cap 30 and the pen main body 10, directionality is given. That is, if the cap 30 and the pen body 10 are not in a specific positional relationship, the cap 30 can be engaged with the pen body 10 so that the inner surface shape of the cap 30 and the front and rear ends of the pen body 10 The outer surface shape is formed. Specifically, when the cap 30 is inserted into the front end portion or the rear end portion of the pen body 10, the cutout portion 32 is configured to be positioned on the indicator portion 24 side. The cap 30 includes a magnet (not shown) on the inner surface of the cap body 31. This magnet is a component for corresponding to a switch mechanism (not shown) provided in the pen body 10. That is, when the cap 30 is removed from the tip end side of the pen body 10, the switch is turned on to turn on the power, and when the tip end side of the pen body 10 is attached to the cap 30, the switch is turned off. Thus, by enabling the switch to be turned on / off by attaching the cap 30, it is possible to improve the feeling of use by the user and to suppress unnecessary power consumption due to forgetting to turn off the switch.

  FIG. 2 is a diagram showing an example in which the pen body 10 is used on an indoor desk or the like. Here, a cradle 50 for placing the pen body 10 on a desk or the like and enabling charging and communication is shown. The cradle 50 includes a separation unit 51 that holds the inserted pen body 10 and a base 52 that can be attached with the separation unit 51, thereby constituting a separation-type cradle. Here, a USB cable 53 as an interface connected to the USB connector of the separation unit 51 is shown. The cradle 50 including the separation unit 51 and the base 52 has a function for placing the pen body 10 and a function for charging the pen body 10 and communicating with an external terminal. The base 52 is provided with a weight (not shown) inside in order to increase stability when it is placed. Further, the separation unit 51 has a charging function and a communication function. When the user takes the pen body 10 outside and uses it, only the separation unit 51 is removed from the cradle 50 and taken out, so that charging or communication can be realized outside. The separation unit 51 does not have a function for placing a weight or the like and is light in weight. By separating this and carrying it, the portability can be improved.

  FIG. 3 is a partial cross-sectional view for explaining the structure of the pen body 10. The pen body 10 is entirely covered with the exterior case 11 as described in FIG. And the exterior case 11 of the pen main body 10 is comprised so that attachment of the pen core 12 which has the pen point 12a which protrudes at the front-end | tip of the exterior case 11 is possible. The pen core 12 stores ink ejected from the pen tip 12 a and is attached to the pen body 10 by being inserted from the front end of the exterior case 11. Moreover, it can be removed from the pen body 10 by grasping and pulling out the pen tip 12a. The exterior case 11 includes a writing pressure sensor unit 100 that detects the writing pressure of the user transmitted through the pen core 12.

  The pen body 10 includes an optical module 15 that reads a dot pattern provided by, for example, Anoto. Further, a terminal 16 is provided for supplying power for charging the pen body 10 and for communicating with an external computer. The terminal 16 is connected to a terminal (not shown) of the separating unit 51 and can be energized when the pen body 10 is inserted into the separating unit 51 shown in FIG. Furthermore, the pen body 10 includes a battery 17 made of, for example, a lithium ion battery that becomes a power source of the pen body 10 by discharging after charging, and a vibrator 18 that vibrates when the power is turned on, for example. . In addition, a substrate 20 on which various integrated circuits and electronic components are mounted is provided inside the pen body 10. An optical module 15 is mounted on the substrate 20, and a processor 21 that controls the entire pen body 10 and a memory 22 that stores information (written contents, position information, etc.) read by the optical module 15. For example, a wireless communication module 23 for performing wireless communication by Bluetooth (trademark) or the like is provided.

  FIG. 4 is a diagram illustrating a configuration of the writing pressure sensor unit 100 to which the present exemplary embodiment is applied. The writing pressure sensor unit 100 includes a sensor element 110 and a pressure element (holding member) 130. The sensor element 110 includes an FPC (Flexible Printed Circuit) electrode 111 and an FPC lead 112 that connects the FPC electrode 111 and a terminal on the substrate 20. Further, a pressure-sensitive conductive elastomer 120 provided at a position facing an electrode pattern (described later) of the FPC electrode 111 and a protective cover 121 for protecting the pressure-sensitive conductive elastomer 120 are provided. The pressure element 130 is made of a hard insulating material that is sufficiently hard with respect to the protective cover 121 of the sensor element 110, and has a smooth spherical contact surface (described later). By pressing the sensor element 110 with the pressurizing element 130, the writing pressure sensor unit 100 is highly durable against repeated loads when the resistance value is changed and pressure (load) is detected with high sensitivity. Is realized.

  FIG. 5 is a diagram for explaining the shape of the FPC electrode 111 constituting the sensor element 110 of the writing pressure sensor unit 100. The FPC electrode 111 has a spiral electrode pattern 113 at the center of an electrode having a diameter (φ) of 4 mm, for example, and is pressure-sensitively conductive from the center of the electrode pattern 113 even when pressed by the pressurizing element 130 (see FIG. 4). The electrode can be brought into contact with the conductive elastomer 120. The electrode pattern 113 of the FPC electrode 111 is obtained by adding a nickel / gold plating of 3.5 μm to a copper electrode of 12 μm, and an FPC coverlay 114 having a thickness of 25 μm is formed on the outer periphery of the φ4 mm electrode surface. Has been. By disposing the FPC coverlay 114 on the outer peripheral portion of the φ4 mm electrode surface, it is possible to ensure a certain gap between the FPC electrode 111 and the pressure-sensitive conductive elastomer 120.

  FIG. 6 is a view showing a cross section of the sensor element 110 in the writing pressure sensor unit 100. As shown in FIG. 6, in the sensor element 110 of the writing pressure sensor unit 100, an electrode pattern 113 and an FPC coverlay 114 surrounding the electrode pattern 113 are formed on the FPC electrode 111. The FPC coverlay 114 is bonded to the pressure-sensitive conductive elastomer 120 at the first bonding portion 122. The FPC coverlay 114 is preferably made of PET (polyethylene terephthalate) or Kapton (trademark), which is a polyimide film having excellent heat resistance and cold resistance, and has high hardness and is difficult to be compressed. As the pressure-sensitive conductive elastomer 120, for example, Inastomer # 86 manufactured by Inaba Rubber Co., Ltd. having a thickness of 0.5 mm was used. The adhesion region of the first adhesion part 122 is on the FPC cover lay 114 outside the φ4 mm electrode pattern formation region of the FPC electrode 111.

  In addition, the pressure-sensitive conductive elastomer 120 is bonded to the protective cover 121 at the second bonding portion 123. As the protective cover 121, for example, urethane rubber (hardness 70Hs) having a thickness of 0.5 mm is used. Further, the adhesion region by the second adhesion part 123 is only outside the electrode pattern formation region of φ4 mm, similarly to the adhesion region of the first adhesion part 122. As a result, the pressure-sensitive conductive elastomer 120 and the protective cover 121 are not bonded by an adhesive in the region corresponding to the φ4 mm electrode pattern forming region. This region is a portion where pressure from the pressurizing element 130 (see FIG. 4) is preferentially applied. By setting this region as a non-bonded region, for example, when a writing pressure is applied by the pressure element 130 from an oblique direction, a portion to which a resistance such as a lateral displacement force is applied becomes free. And by making this part free, it becomes possible to apply pressure equally to the electrode pattern 113.

  Here, when the pressure element 130 is brought into contact with the pressure-sensitive conductive elastomer 120 as it is without providing the protective cover 121, it cannot withstand the repeated load as described above, and the pressure-sensitive conductive material can be used at an early point. There was a hole in the elastomer 120. Moreover, if a hard material is selected as the protective cover 121, the surface pressure with respect to the pressure-sensitive conductive elastomer 120 becomes large, and it becomes difficult to obtain a preferable sensitivity. Therefore, in the present embodiment, by adopting urethane rubber (hardness 70Hs) having a thickness of 0.5 mm for the protective cover 121, the sensor element 110 that achieves high sensitivity characteristics by appropriate pressure dispersion is realized. . In the sensor element 110 formed as described above, the element external size of the sensor pressure-sensitive portion is 1.5 mm or less. It is a variable resistance pressure sensor that covers a dynamic range of 0 to 500 gf, and the resistance value changes from 40 kΩ or more at no load to 120 kΩ or less at a load of 30 gf. The high durability sensor that can maintain the performance of is realized.

Next, the pressure element 130 of the writing pressure sensor unit 100 will be described with reference to FIGS.
FIG. 7 is a perspective view showing the configuration of the pressure element 130. FIG. 8 is a cross-sectional view of the cylindrical pressure element 130 shown in FIG. 7 cut in the vertical direction. Further, FIG. 9 is a cross-sectional view of the pressure element 130 shown in FIG. 7 cut in the lateral direction. As the pressurizing element 130, a resin containing polycarbonate glass fiber having good permanent strain resistance is used as a material.

  The pressurizing element 130 to which the present embodiment is applied has a function of pressing the elastic members (the protective cover 121 and the pressure-sensitive conductive elastomer 120) of the sensor element 110 as well as the function of holding the pen core 12. Therefore, the pressure element 130 can also be called a holding member. The pressurizing element (holding member) 130 has an opening side (one end) 131 having an opening 131a for receiving the pen core 12, and a pressure unit side (the other end) having a pressurizing part 132a provided toward the elastic member side. ) 132 and an elastic mechanism portion 133 provided between the opening portion side 131 and the pressure portion side 132 and provided with a pen core holding portion 133a (see FIGS. 8 and 9) for holding the pen core 12 on the inner wall. It has. This elastic mechanism part 133 forms a spring mechanism that holds both ends by a plurality of (two in this embodiment) slits 136, the opening part 131, and the pressure part 132. By providing slits 136 on both sides of the pen core holding portion 133a, it is possible to cause the elastic mechanism portion 133 of the pressurizing element 130 to be appropriately elastically deformed in a state where the pen core 12 is press-fitted and held. . Further, the pressurizing part 132a that is the end face of the pressurizing part side 132 forms a smooth spherical surface having a radius (R) of 10 mm as described above, thereby absorbing the impact of the pen core 12 and the protective cover 121. The pressurizing element 130 can be softly contacted. Even when the writing pressure is generated from an oblique direction, a good writing pressure can be detected by appropriate load distribution.

  The opening 131a, which is the inner surface of the opening 131, is larger than the diameter of the pen core 12, so that the press-fitting stress of the pen core 12 is not directly applied. The pen core holding portion 133a of the elastic mechanism portion 133 that is an inner surface intermediate portion has a shape that is narrowed to be smaller than the other inner diameter, and the pen core 12 is press-fitted and held at this portion. The cross-sectional shape of the pen core holding portion 133a is a shape along the outer diameter of the pen core 12, and is configured to increase the contact area with the pen core 12. As a result, in addition to the elastic force of the pen core holding portion 133a, the frictional force is also improved, and the holding force of the pen core 12 can be further increased. Further, an innermost portion 134 (see FIG. 8) is provided on the inner surface of the pressurizing element 130 at a position where the rear end portion (on the side opposite to the pen tip 12a) of the inserted pen core 12 hits. Further, a vent hole 138 is provided on the pressurizing portion side 132 of the pressurizing element 130, and air is ensured to eject ink from the rear end portion of the inserted pen core 12. Further, the innermost innermost part 134 is provided with a lateral hole 137 for opening the inner diameter stop and for securing the ink vent hole 138, and a direct stress from the pen core 12 is also applied to this part. It has a structure that does not participate.

Here, in order to be able to replace the pen core 12 without disassembling the pen body 10, it is necessary to be able to be easily inserted and removed from the pen tip 12 a which is the tip of the pen core 12. For this purpose, it is necessary to always apply a constant load to the pen core 12 when the end of the pen core 12 opposite to the pen tip 12a (the end on the back side) is press-fitted into the holding mechanism. At this time, in the conventional holding mechanism, permanent distortion occurs due to the passage of time or the change of the temperature environment, and the holding force is reduced due to the passage of time and the change of the pen core outer diameter, so that the pen core 12 is easily removed. The problem that occurred.
On the other hand, the pressurizing element 130 to which the present embodiment is applied has the above-described shape, and holds both ends of the flexure deforming portion with respect to the flexure deformation when the pen core 12 is press-fitted. This makes it possible to obtain a structure that does not easily cause permanent distortion.

  With such a configuration, when the user writes the character or the like on the dedicated paper while holding the pen body 10 in his hand, the writing pressure is transmitted from the pen core 12 to the pressure element 130. That is, when the pressure applied to the pen core 12 by the user is transmitted to the pressurizing element 130, the pressurizing element 130 presses the sensor element 110. In the sensor element 110, a value (voltage value or current value) corresponding to a resistance that changes according to a state in which the pressure-sensitive conductive elastomer 120 is pressed and contacts the electrode pattern 113 is set via the FPC lead 112 to the processor 21 (FIG. 3). The processor 21 converts the writing pressure based on the value obtained from the sensor element 110, and executes predetermined processing (trajectory calculation or the like) according to the writing pressure state.

  As described above in detail, in the present embodiment, a sensor element that is a pressure-sensitive sensor using a pressure-sensitive conductive elastomer is employed in the pen-type input device. This sensor element secures a specific gap between the height of the electrode pattern and the height of the FPC coverlay, and a protective cover, which is urethane rubber for surface protection, is arranged in a layered manner on the pressure-sensitive conductive elastomer. . With such a structure, for example, a small sensor structure having high sensitivity that reacts to a load from 30 gf and high durability against a repeated load is realized. Furthermore, the switch-on stroke can be reduced by using the sensor element having such a structure. Furthermore, since the impact at the tip of the pen is absorbed, the user's writing quality can be improved.

  Further, in this embodiment, a pen core such as a replaceable ballpoint pen is held as a pressure element of a writing pressure sensor unit used in a pen-type input device, that is, a pen core holding member in a pen on which a user writes characters. Mechanism (pen core holding mechanism). The pen core holding mechanism constitutes a spring mechanism for holding both ends as described above, and has a vent hole for ballpoint pen ink. Accordingly, it is possible to provide a pen core holding mechanism that makes it difficult for the pen core holding force to decrease, that is, the pen core holding force decreases due to permanent distortion.

It is the perspective view which showed the whole structure of the pen-type input device to which this Embodiment is applied. It is the figure which showed the example in the case of using a pen main body on an indoor desk etc. It is a fragmentary sectional view for demonstrating the structure of a pen main body. It is the figure which showed the structure of the pen pressure sensor part to which this Embodiment is applied. It is a figure for demonstrating the shape of the FPC electrode which comprises the sensor element of a pen pressure sensor part. It is the figure which showed the cross section of the sensor element of a writing pressure sensor part. It is the perspective view which showed the structure of the pressurization element. It is sectional drawing which cut | disconnected the pressurization element shown in FIG. 7 to the vertical direction. It is sectional drawing which cut | disconnected the pressurization element shown in FIG. 7 to the horizontal direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pen main body, 11 ... Exterior case, 12 ... Pen core, 12a ... Pen tip, 100 ... Pen pressure sensor part, 110 ... Sensor element, 111 ... FPC electrode, 113 ... Electrode pattern, 114 ... FPC coverlay, 120 ... Pressure-sensitive conductive elastomer, 121 ... protective cover, 122 ... first adhesive portion, 123 ... second adhesive portion, 130 ... pressure element (holding member)

Claims (15)

The body,
A pen core attached to the main body;
An electrode pattern is formed on the substrate, and includes a sensor element that detects a user's writing pressure obtained from the pen core,
The sensor element is provided with a pressure-sensitive conductive elastomer facing the electrode pattern, and the pressure-sensitive conductive elastomer is deformed by pressure obtained from the pen core to change a resistance value between the electrode patterns. A pen-type input device that detects a user's writing pressure.   2. The pen type according to claim 1, wherein the sensor element is provided with a cover lay for ensuring a gap between the electrode pattern and the pressure-sensitive conductive elastomer in a state where a user's writing pressure is not applied. Input device.   The pen-type input device according to claim 2, wherein the cover lay of the sensor element is formed of a hard insulating material on an outer peripheral portion of the electrode pattern.   2. The pen-type input device according to claim 1, wherein the sensor element has a protective member for protecting the pressure-sensitive conductive elastomer laminated on the pressure side of the pen core.   The pen-type input device according to claim 1, further comprising a pressure element that holds the pen core and transmits a user's writing pressure obtained from the pen core to the pressure-sensitive conductive elastomer. The body,
A pen core attached to the main body;
An electrode pattern is formed on the substrate, and includes a sensor element that detects a user's writing pressure obtained from the pen core,
The sensor element includes a first layer made of a pressure-sensitive conductive elastomer on a side facing the electrode pattern, and a second layer made of a protective member for protecting the pressure-sensitive conductive elastomer on a pressure side by the pen core. A pen-type input device in which are stacked.   The pen type according to claim 6, wherein the sensor element is provided with a cover lay for securing a gap between the electrode pattern and the first layer when there is no pressure around the detection portion by the electrode pattern. Input device.   The pen-type input according to claim 6, further comprising a pressurizing element that holds the pen core and transmits the user's writing pressure obtained from the pen core in contact with the second layer. apparatus.   The pressure element includes an opening provided toward the tip side of the pen core, a pressure surface provided toward the second layer, and the pen core between the opening and the pressure surface. The pen-type input device according to claim 8, further comprising a pen core holding unit that holds the pen. The pressure element is made of a hard material,
The second layer of the sensor element is a protective member made of a material having elasticity and higher durability against repeated load due to contact of the pressure element than the first layer. The pen-type input device according to claim 6.   The first layer and the second layer of the sensor element are not bonded to a portion where the pressure element contacts the second layer, and a peripheral portion away from the contact portion is bonded. The pen-type input device according to claim 6. A sensor element provided in a pen-type input device for measuring a writing pressure by a user,
A substrate,
An electrode pattern formed on the substrate;
A pressure-sensitive conductive elastomer that is provided facing the electrode pattern and deforms when pressed;
A protective member laminated on the pressurized side of the pressure-sensitive conductive elastomer,
A sensor element capable of measuring a user's writing pressure by detecting a change in resistance value between the electrode patterns due to pressure deformation of the pressure-sensitive conductive elastomer.   When the pressure-sensitive conductive elastomer is not pressurized, a predetermined gap is secured between the electrode pattern and the conductive pattern, and the pressure-sensitive conductive elastomer is brought into contact with the electrode pattern by being pressurized. The sensor element according to claim 12, further comprising a coverlay to be moved.   The sensor element according to claim 13, wherein the coverlay is provided on an outer peripheral portion of the electrode pattern, and one surface is bonded to the substrate and the other surface is bonded to the pressure-sensitive conductive elastomer.   The sensor element according to claim 12, wherein the pressure-sensitive conductive elastomer and the protective member are bonded to a peripheral portion of a region where the electrode pattern is formed.

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