Peripheral devices

Abstract

To provide a peripheral apparatus capable of suppressing wear due to contact with a display apparatus that can be detected as a surface of the display apparatus.SOLUTION: A peripheral apparatus that is used in a display apparatus having a hovering area formed on a surface, comprises: a flat portion; and a projecting portion projecting from the flat portion toward the surface of the display apparatus and capable of contacting the surface. A protrusion amount of the projecting portion is defined to be equal to or less than a height of the hovering area.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a peripheral device. [Background technology]

[0002] Patent Document 1 discloses an eraser for a character and graphic input device that has protrusions for inputting the position of the eraser at one or more corners of the erasing surface of the eraser so that the eraser does not touch the input surface when the erasing surface of the eraser is pressed against the input surface, but only touches the input surface when a corner of the eraser is pressed against the input surface, making it possible to erase minute areas of characters and graphics already drawn on the input surface and to input the coordinate values ​​of the protrusions.

[0003] The conventional technology is configured to detect the contact of a protrusion with the surface on which characters and figures are displayed and input the coordinates of the protrusion, but the display device cannot detect the contact of the display surface with the erasing tool as a surface. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a peripheral device that can suppress wear due to contact with a display device, the surface of which can be detected as a plane. [Means for solving the problem]

[0005] The present invention provides a hovering area on a surface, When the area of ​​the object that has entered the hovering area exceeds a predetermined threshold value, the device starts an erasing operation to erase the drawing information written on the surface. A peripheral device used for a display device, the peripheral device is an eraser that erases the drawing information, The peripheral device is a circular first flat surface portion used during a normal erase operation; and a second flat surface portion having a smaller area than the first flat surface portion, protruding outward from an end of the first flat surface portion so as to be inclined at a predetermined angle relative to the first flat surface portion, and used during a small-area erase operation; The aforementioned 1st The display device is characterized in that it has a protruding portion that protrudes from a flat portion toward the surface of the display device and is capable of contacting the surface, the protruding amount of the protruding portion is set to be equal to or less than the height of the hovering area, and the protruding portion has a shape that makes point contact with the surface. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a peripheral device that can suppress wear due to contact with a display device whose surface with the display device can be detected as a plane. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. [Figure 2] FIG. 2 is an explanatory diagram showing the appearance of the surface of a touch panel. [Figure 3] FIG. 2 is an explanatory diagram showing the relationship between a capacitive touch panel and a hovering area. [Figure 4] FIG. 2 is an explanatory diagram showing the relationship between an infrared touch panel and a hovering area. [Figure 5] 1 is a diagram showing the overall configuration of a peripheral device according to an embodiment of the present invention; [Figure 6] FIG. 1 is an explanatory diagram illustrating a peripheral device according to an embodiment of the present invention when used with a capacitive touch panel. [Figure 7] FIG. 1 is an explanatory diagram illustrating a peripheral device according to an embodiment of the present invention when used with an infrared touch panel. [Figure 8] FIG. 1 is a configuration diagram showing an example of hardware of an electronic whiteboard. [Figure 9] FIG. 10 is an explanatory diagram of a first modified example of the present invention. [Figure 10] FIG. 10 is an explanatory diagram of a second modified example of the present invention. [Figure 11] FIG. 10 is an explanatory diagram of a third modified example of the present invention. [Figure 12] FIG. 10 is an explanatory diagram of a fourth modified example of the present invention. [Figure 13] FIG. 10 is an explanatory diagram of a fifth modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described below with reference to the drawings.

[0009] FIG. 1 is a schematic explanatory diagram of an interactive whiteboard as an example of a display device.

[0010] The electronic whiteboard 2 (hereinafter referred to as an IWB (Interactive Whiteboard)) includes a display 280. The display 280 is a touch panel display equipped with a contact sensor that detects contact of an object with its surface. The IWB 2 has become widely used in recent years for meetings, seminars, presentations, classes, etc., because it allows multiple members to share information displayed on the display 280 attached to, for example, a stand 20.

[0011] The IWB 2 can display information from a terminal such as a notebook PC (Personal Computer), tablet, or smartphone on a display 280, and can write by hand directly on the display 280 that displays the information. The IWB 2 can also save the information displayed on the display 280 as data. When writing by hand directly on the display 280, the user can write characters, figures, etc. on the display 280 by touching the display 280 with a finger or a pen-type input device 290. When erasing drawing information such as characters or figures written on the display 280, the user can erase the characters, figures, etc. from the display 280 by touching the characters, figures, etc. to be erased with an eraser 300 and performing a rubbing motion.

[0012] The display 280 detects an object that has come into contact with the surface of the display 280 using a contact sensor provided in the display 280, and the sensor controller controls the operation of the display 280 according to the contact area calculated from the detection result. For example, if the contact area is equal to or smaller than a predetermined determination threshold, the sensor controller determines that a finger or pen-type input device 290 has touched the display 280, and proceeds to a writing operation. If the contact area exceeds the predetermined determination threshold, the sensor controller determines that an eraser 300 has touched the display 280, and proceeds to an erasing operation.

[0013] FIG. 2 is an explanatory diagram showing the appearance of the surface of the touch panel.

[0014] As described above, the display 280 detects an object that has come into contact with the surface of the display 280 using a contact sensor, and the sensor controller controls the operation of the display 280 based on the detection result.

[0015] Incidentally, a contact sensor always has a detection tolerance, which exists in a region of height Ht relative to the surface of the display 280 as shown in the figure. The height Ht of the detection tolerance varies slightly depending on the type and performance of the contact sensor, but is approximately 0.1 mm to 0.5 mm. Therefore, in controlling the operation of the display 280, even if an object is not directly touching the surface of the display 280, the contact sensor can detect the object as long as the object is within the detection tolerance. In this invention, the range of the height Ht of the detection tolerance is called the "hovering region" (Fh).

[0016] Among the objects that come into contact with the display 280 when the IWB 2 is in use, the eraser 300 in particular has a larger contact area than the user's finger or the pen-type input device 290. Therefore, if the contact surface of the eraser 300 is made of a hard material, an unpleasant contact sound will be generated every time an erasing operation is performed.

[0017] Furthermore, if the contact surface of the eraser 300 is made of a soft material such as a fibrous material in order to suppress contact noise, the contact surface of the eraser 300 will be subject to wear and tear and become more susceptible to damage due to contact with the display 280. Furthermore, dirt from the display 280 will be more likely to accumulate on the contact surface of the eraser 300, making it unsanitary.

[0018] In particular, when the display 280 is a capacitive touch panel, conductive fabric with metal threads woven into it is used on the contact surface of the eraser 300 to suppress contact noise while ensuring conductivity. This makes the damage and dirt accumulation more pronounced. Therefore, if it were possible to detect the contact surface of the eraser 300 in the hovering range Fh, the above problems could be resolved.

[0019] Below, a capacitive touch panel display and an infrared touch panel display will be described as typical examples.

[0020] Figure 3 is an explanatory diagram showing the relationship between the capacitive touch panel and the hovering area, where Figure 3(a) shows the state where the eraser 300 is outside the hovering area Fh, and Figure 3(b) shows the state where the eraser 300 is inside the hovering area Fh.

[0021] In the capacitive touch sensor, when a conductive object (here, the eraser 300) enters the hovering area Fh, electrostatic coupling occurs between the touch sensor 214a provided on the display 280 and the eraser 300, causing a change in capacitance. The touch sensor 214a detects the eraser 300 that has entered the hovering area Fh by capturing the change in capacitance, and the sensor controller identifies the area and position of the eraser 300 based on the detection result of the touch sensor 214a. Note that in the state shown in FIG. 3(a), the eraser 300 is outside the hovering area Fh, so no change in capacitance occurs, and the sensor controller determines that "no object is present."

[0022] Electrostatic coupling basically occurs when the contact surface 300a of the eraser 300 directly contacts the surface of the display 280. However, since a hovering area Fh actually exists, electrostatic coupling is established when the contact surface 300a of the eraser 300 enters the hovering area Fh as shown in Figure 3(b), making it possible to detect the area and position of the eraser 300. Note that the capacitive method only reacts to objects that are conductive, so the contact surface 300a of the eraser 300 must be made of a conductive material.

[0023] Figure 4 is an explanatory diagram showing the relationship between the infrared touch panel and the hovering area, where Figure 4(a) shows the state where the eraser 300 is outside the hovering area Fh, and Figure 4(b) shows the state where the eraser 300 is inside the hovering area Fh.

[0024] The infrared method uses an infrared sensor 214b consisting of a light-emitting unit 2141 equipped with an infrared LED (Light Emitting Diode) and a light-receiving unit 2142 that detects the infrared light emitted by the light-emitting unit 2141. A plurality of infrared sensors 214b are installed on a frame or the like that surrounds the periphery of the display 280, with the light-emitting unit 2141 and the light-receiving unit 2142 facing each other.

[0025] When an object (here, the eraser 300) enters between the light-emitting unit 2141 and the light-receiving unit 2142, the infrared rays are blocked. The infrared sensor 214b detects the eraser 300 that has entered the hovering area Fh by detecting the blocking of the infrared rays, and the sensor controller identifies the area and position of the eraser 300 based on the detection result of the infrared sensor 214b. Note that in the state of FIG. 4(a), the eraser 300 is outside the hovering area Fh, so the infrared rays are not blocked and the sensor controller determines that "there is no object."

[0026] Blocking of infrared rays basically occurs when the contact surface 300a of the eraser 300 directly touches the surface of the display 280. However, in reality, a hovering area Fh exists, and therefore it becomes possible to detect the blocking of infrared rays when the contact surface 300a of the eraser 300 enters the hovering area Fh, as shown in Figure 4(b), making it possible to detect the area and position of the eraser 300. Note that the infrared method has an advantage in terms of design freedom compared to the capacitive method, as there are no particular restrictions on the material used for the contact surface 300a of the eraser 300.

[0027] In the following description, the touch sensor 214a shown in Figure 3 and the infrared sensor 214b shown in Figure 4 will be collectively referred to as the contact sensor 214. Next, the peripheral device of the present invention will be described in detail.

[0028] 5A and 5B are diagrams illustrating the overall configuration of a peripheral device according to an embodiment of the present invention, in which an eraser is shown as an example of the peripheral device, with Fig. 5A being an overall side view of the eraser and Fig. 5B being an overall bottom view of the eraser.

[0029] The eraser 300 mainly comprises a casing 301 and a detectable portion 302. The casing 301 holds the detectable portion 302 and also serves as a grip for a user when using the eraser 300. The detectable portion 302 comprises a first flat portion 302a and a second flat portion 302b. The first flat portion 302a has a circular bottom surface as shown in FIG. 5(b), and the second flat portion 302b protrudes outward from a part of the first flat portion 302a and is inclined at an angle θ with respect to the first flat portion 302a as shown in FIG. 5(a).

[0030] The first flat surface 302a has an area roughly the size of a fist, and the second flat surface 302b has an area roughly the size of the pad of a thumb. For example, the first flat surface 302a is used for normal erasing operations, and the second flat surface 302b is used for erasing small areas by tilting the eraser 300 at an angle θ so that the second flat surface 302b is parallel to the display surface. In this way, the user can use the eraser 300 by selectively using the first flat surface 302a and the second flat surface 302b.

[0031] The material (substance) constituting the detected part 302 is selected appropriately based on the type of touch panel display (capacitive type, infrared type, etc.).

[0032] The detected portion 302 also has a protruding portion 303 that protrudes from the first flat portion 302a toward the display surface, and the amount of protrusion is set to be equal to or less than the height of the above-mentioned hovering area Fh. Therefore, when the eraser 300 performs an erasing operation, the protruding portion 303 comes into contact with the display surface, and the first flat portion 302a is no longer in direct contact with the display surface.

[0033] In this embodiment, the first flat surface 302a is supported at three points by three protrusions 303 provided on the first flat surface 302a, so that the first flat surface 302a is parallel to the display surface. The protrusions 303 are made of a material (such as a resin material or hard rubber) that is softer than the material that forms the display surface, thereby suppressing contact noise with the display surface during the erasing operation.

[0034] Furthermore, in order to reduce the contact area with the display surface, it is preferable that the protrusion 303 has a shape that makes point contact with the display surface, and in this embodiment, the protrusion 303 has a semicircular cross section.

[0035] In this embodiment, the protruding portion 303 is provided only on the first flat surface portion 302a, but the protruding portion 303 may also be provided on the second flat surface portion 302b. In this case, the protruding amount of the protruding portion 303 protruding from the second flat surface portion 302b toward the display surface is set to be equal to or less than the height of the hovering range Fh. Here, the first flat surface portion 302a is an example of a "flat surface portion," and the protruding portion 303 is an example of a "protruding portion."

[0036] Furthermore, the number of flat surfaces of the detected part 302 is not limited to two (302a, 302b). For example, it may be three or more surfaces, or conversely, it may be one surface.

[0037] As described above, this embodiment is an eraser 300 for use with a display 280 having a hovering area Fh on its surface, and the eraser 300 comprises a first planar portion 302a and a protruding portion 303 that protrudes from the first planar portion 302a toward the surface of the display 280 and is capable of contacting the surface of the display 280, and the protruding amount of the protruding portion 303 is set to be equal to or less than the height of the hovering area Fh.

[0038] As a result, during an erasing operation by the eraser 300, the protrusion 303 comes into contact with the surface of the display 280, and the first flat surface portion 302a does not come into direct contact with the surface of the display 280. As a result, it is possible to provide an eraser 300 that can suppress wear of the first flat surface portion 302a due to contact with the surface of the display 280.

[0039] As described above, the protrusion 303 also holds the first flat portion 302a parallel to the surface of the display 280.

[0040] This stabilizes the attitude of the first planar portion 302a within the hovering range Fh, thereby reducing false detections caused by tilting of the first planar portion 302a.

[0041] As described above, the protrusion 303 is made of a material that is softer than the material that forms the surface of the display 280 .

[0042] As described above, the protrusion 303 is shaped to make point contact with the surface of the display 280.

[0043] This makes it possible to suppress the generation of contact noise caused by contact between the protrusion 303 and the surface of the display 280.

[0044] 6 is an explanatory diagram of a peripheral device according to an embodiment of the present invention used with a capacitive touch panel. FIG. 6(a) shows the eraser 300 outside the hovering area Fh, and FIG. 6(b) shows the eraser 300 inside the hovering area Fh. Note that the principles of the capacitive touch panel are the same as those in FIG. 3, and therefore will not be described here. Components equivalent to those already described are designated by the same reference numerals, and their description will be omitted.

[0045] As described above, the amount of protrusion of the protruding portion 303 from the first flat portion 302a is set to be equal to or less than the height Ht of the detection tolerance, that is, the height of the hovering range Fh.

[0046] Therefore, when the protrusion 303 comes into contact with the surface of the display 280, the detected part 302 can also enter the hovering range Fh as shown in Fig. 6(b). As a result, electrostatic coupling is established in the area of ​​the first flat part 302a, making it possible to detect the area and position of the eraser 300.

[0047] 6(a), the eraser 300 is outside the hovering range Fh, so there is no change in capacitance and the sensor controller determines that there is no object. Note that the capacitance method does not react to objects other than those that are conductive, so the detected part 302 is made of a conductive material.

[0048] 7A and 7B are explanatory diagrams illustrating a peripheral device according to an embodiment of the present invention used with an infrared touch panel. FIG. 7A shows the eraser 300 outside the hovering area Fh, and FIG. 7B shows the eraser 300 inside the hovering area Fh. The principles of the infrared system are the same as those in FIG. 4, and therefore will not be described here. Components equivalent to those already described are designated by the same reference numerals, and their description will be omitted.

[0049] 6, the protrusion amount of the protruding portion 303 from the first flat portion 302a is set to be equal to or less than the height of the hovering area Fh. Therefore, when the protruding portion 303 comes into contact with the surface of the display 280, the detected portion 302 can also be brought into the hovering area Fh as shown in FIG. 7(b). As a result, infrared rays are blocked in the area of ​​the first flat portion 302a, making it possible to detect the area and position of the eraser 300.

[0050] On the other hand, in the state of FIG. 7(a), the eraser 300 is outside the hovering range Fh, so the light receiving unit 2142 detects the infrared light emitted from the light emitting unit 2141, and the sensor controller determines that "no object is present."

[0051] In the following description, the touch sensor 214a shown in Fig. 6 and the infrared sensor 214b shown in Fig. 7 will be collectively referred to as the contact sensor 214. Here, the contact sensor 214 is an example of a detection means.

[0052] FIG. 8 is a configuration diagram showing an example of hardware of an interactive whiteboard.

[0053] As shown in the figure, the electronic whiteboard (IWB) 2 includes a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, an SSD (Solid State Drive) 204, a network controller 205, and an external device connection I / F (Interface) 206.

[0054] Of these, the CPU 201 controls the overall operation of the IWB 2. The ROM 202 stores the CPU 201 and programs used to drive the CPU 201, such as an IPL (Initial Program Loader). The RAM 203 serves as a work area for the CPU 201 and temporarily stores programs and data. The SSD 204 stores various data, such as programs for the IWB.

[0055] The network controller 205 controls communication with the communication network. The external device connection I / F 206 is an interface for connecting various external devices. In this case, the external devices are, for example, a USB (Universal Serial Bus) memory 230 and external devices (a microphone 240, a speaker 250, and a camera 260).

[0056] The IWB 2 also includes a capture device 211, a GPU (Graphics Processing Unit) 212, a display controller 213, a contact sensor 214, a sensor controller 215, an electronic pen controller 216, a short-range communication circuit 219, an antenna 219a of the short-range communication circuit 219, a power switch 222, and selection switches 223.

[0057] Of these, the capture device 211 displays video information as still images or moving images on the display of an external PC (Personal Computer) 270. The GPU 212 is a semiconductor chip that specializes in graphics. The display controller 213 controls and manages the screen display to output the output image from the GPU 212 to a display 280 or the like.

[0058] The contact sensor 214 detects contact of a pen-type input device 290 such as an electronic pen or a touch pen, an eraser 300, a user's hand (finger) H, or the like on the display 280. The sensor controller 215 controls the processing of the contact sensor 214. The contact sensor 214 is realized by a touch sensor 214a shown in FIG. 6 and an infrared sensor 214b shown in FIG. 7, and inputs and detects the coordinates of an object that has touched the display 280. The sensor controller 215 identifies the area and position of the object from the coordinate information based on the output of the contact sensor 214.

[0059] If the pen-type input device 290 being used has a communication function, the electronic pen controller 216 communicates with the pen-type input device 290 to determine whether the pen tip or the pen tail has touched the display 280. The short-range communication circuit 219 is a communication circuit such as NFC (Near Field Communication) or Bluetooth (registered trademark).

[0060] The power switch 222 is a switch for switching ON / OFF the power supply of the IWB 2. The selection switches 223 are a group of switches for adjusting the brightness and color of the display 280, for example.

[0061] Furthermore, the IWB 2 includes a bus line 210. The bus line 210 is an address bus, a data bus, etc. for electrically connecting the components such as the CPU 201.

[0062] The contact sensor 214 is not limited to the touch sensor 214a and the infrared sensor 214b. For example, various methods may be used, such as a resistive film method that identifies the contact position by a voltage change between two opposing resistive films, or an electromagnetic induction method that identifies the contact position by detecting electromagnetic induction caused by contact with an object. Furthermore, the electronic pen controller 216 may determine whether or not the pen tip and pen tail of the pen-type input device 290 have been touched, as well as the portion of the pen-type input device 290 that the user holds or other portions.

[0063] Hereinafter, modifications of the present invention will be described.

[0064] FIG. 9 is an explanatory diagram of a first modified example of the present invention.

[0065] While the embodiment of Figure 5 is configured to support the first flat portion 302a at three points using three protrusions 303 provided on the first flat portion 302a, this modified example differs in that only one protrusion 304 is provided in the center of the first flat portion 302a. Note that the shape of the protrusion 304 is not limited to the circular shape shown in the figure, as long as it can hold the first flat portion 302a parallel to the display surface. The protrusion 304 may also be ring-shaped with a hollowed-out center portion (for example, the portion indicated by the dashed line in the figure).

[0066] According to this modification, the area of ​​contact is smaller than when the entire surface of the first flat surface portion 302a is in contact with the display surface, which reduces the harsh contact noise when moving across the display surface. Also, because the first flat surface portion 302a does not come into direct contact with the display surface, damage to the first flat surface portion 302a due to wear can be suppressed.

[0067] FIG. 10 is an explanatory diagram of a second modified example of the present invention.

[0068] 5, protrusion 303 supporting first flat portion 302a at three points is a member with a semicircular cross section, whereas this modification is different in that protrusion 305 is provided with a sphere. Specifically, protrusion 305 is realized by a free ball bearing or the like provided with a sphere (ball) that is held so as to be movable 360 ​​degrees in all directions.

[0069] According to this modification, the user can move the eraser 300 smoothly on the display, which further reduces the contact noise when moving the eraser 300 on the display surface. Also, because the first flat surface portion 302a does not come into direct contact with the display surface, damage due to wear of the first flat surface portion 302a can be suppressed.

[0070] FIG. 11 is an explanatory diagram of a third modified example of the present invention.

[0071] 5, protrusions 303 are provided on first flat portion 302a, whereas this modified example differs in that protrusions 306 are provided on casing 301. That is, protrusions 306 are provided at multiple locations (four locations in this modified example) on the edge of casing 301, and protrusions 306 are provided so as to protrude from casing 301 toward the display side. Note that protrusions 306 may also be configured as protrusions having spheres as in the second modified example.

[0072] In this modification, the contact area between the display surface and the eraser 300 can also be reduced, thereby reducing contact noise when moving over the display surface. Furthermore, since the first flat surface portion 302a does not come into direct contact with the display surface, damage to the first flat surface portion 302a due to wear can be suppressed.

[0073] FIG. 12 is an explanatory diagram of a fourth modified example of the present invention.

[0074] 5, the first flat surface portion 302a is circular, whereas this modification has a rectangular shape. Note that the rectangular shape is merely an example, and the present invention can be applied to any shape. Also, in this modification, the protrusion 303 may be configured as a spherical protrusion like the second modification.

[0075] According to this modification, the contact area between the display surface and the eraser 300 can be reduced, thereby reducing the contact noise when moving over the display surface. Also, since the first flat surface portion 302a does not come into direct contact with the display surface, damage to the first flat surface portion 302a due to wear can be suppressed.

[0076] FIG. 13 is an explanatory diagram of a fifth modified example of the present invention.

[0077] The first flat surface portion 302a is circular in the embodiment shown in Fig. 5, whereas the present modification has a rectangular shape. Also, the fourth modification shown in Fig. 12 is different in that the first flat surface portion 302a is supported at three points by three protrusions 303, whereas the present modification has rod-shaped protrusions 307 provided at both longitudinal ends of the first flat surface portion 302a.

[0078] The size of the protrusion 307 may be changed as appropriate as long as it is capable of holding the first flat surface 302a parallel to the display surface. The location of the protrusion 307 is not limited to both longitudinal ends of the first flat surface 302a. For example, the protrusion 307 may be provided in the center of the first flat surface 302a, or may be provided in the lateral direction.

[0079] According to this modification, the contact area between the display surface and the eraser 300 can be reduced, thereby reducing the contact noise when moving over the display surface. Also, since the first flat surface portion 302a does not come into direct contact with the display surface, damage to the first flat surface portion 302a due to wear can be suppressed.

[0080] In the above description, an eraser has been used as an example of a peripheral device, but the present invention is not limited to erasers. The present invention is applicable to all peripheral devices that are operated by a user on a display device such as a monitor.

[0081] The above description is merely an example, and the present invention provides unique effects for each of the following aspects.

[0082] The first aspect is a peripheral device (e.g., eraser 300) used with a display device (e.g., touch panel display 280) that forms a hovering area (e.g., hovering area Fh) on its surface (e.g., the surface of touch panel display 280), characterized in that the peripheral device has a planar portion (e.g., first planar portion 302a) and a protruding portion (e.g., protruding portion 303) that protrudes from the planar portion toward the surface of the display device and is capable of contacting the surface, and the protruding amount of the protruding portion is specified to be equal to or less than the height of the hovering area (e.g., height Ht of detection tolerance).

[0083] According to the first aspect, the protrusion comes into contact with the surface of the display device and the flat portion does not come into contact with the surface of the display device, thereby providing a peripheral device that can suppress wear on the flat portion due to contact with the surface of the display device.

[0084] The second aspect is characterized in that, in the first aspect, the protrusion (e.g., protrusion 303) holds the planar portion (e.g., first planar portion 302a) parallel to the surface (e.g., the surface of touch panel display 280).

[0085] According to the second aspect, the attitude of the planar portion within the hovering area is stabilized, and erroneous detection due to tilting of the planar portion can be reduced.

[0086] The third aspect is characterized in that in the first or second aspect, the protrusion (e.g., protrusion 303) is made of a material that is softer than the material that forms the surface (e.g., the surface of touch panel display 280).

[0087] The fourth aspect is characterized in that, in any of the first to third aspects, the protrusion (e.g., protrusion 303) has a shape that makes point contact with the surface (e.g., the surface of touch panel display 280).

[0088] According to the third and fourth aspects, it is possible to suppress the generation of contact noise caused by contact between the protrusion and the surface of the display device. [Explanation of symbols]

[0089] 280 Display (display device) 300 Eraser (peripheral device) 301 Casing 302 Detected part 302a First flat surface portion (flat surface portion) 302b Second flat portion 303 Protrusion Fh hovering range Ht: Height of detection tolerance [Prior art documents] [Patent documents]

[0090] [Patent Document 1] Japanese Patent Publication No. 61-026124

Claims

1. A peripheral device for use with a display device that forms a hovering area on a surface, and that transitions to an erasing operation of erasing drawing information written on the surface when an area of ​​the surface that has entered the hovering area exceeds a predetermined determination threshold, the peripheral device is an eraser that erases the drawing information, The peripheral device is a circular first plane portion used during a normal erase operation; a second planar portion having an area smaller than that of the first planar portion, protruding outward from an end of the first planar portion so as to be inclined at a predetermined angle relative to the first planar portion, and used during a small-area erasing operation; a protrusion that protrudes from the first planar portion toward the surface of the display device and is capable of coming into contact with the surface; The protrusion amount of the protrusion is set to be equal to or less than the height of the hovering area, The peripheral device is characterized in that the protrusion is shaped to make a point contact with the surface.

2. 2. The peripheral device according to claim 1, wherein the protrusion holds the first flat portion parallel to the surface.

3. 3. The peripheral device according to claim 1, wherein the protrusion is made of a material softer than the material of the surface.

4. 2. The peripheral device according to claim 1, wherein the hovering area is a range of heights of detection tolerances generated in a height direction from the surface by a detection means for detecting contact of the protrusion with the surface.

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