JP2017027415A - Electronic pen, electronic pen holder and coordinate input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism of an electronic pen used for an optical touch panel that, when a user starts writing from a power-saving mode, sends a predetermined writing signal from a moment at which the writing starts, and achieves quick transition from the power-saving mode to an operation mode so as not to delay the writing.SOLUTION: An electronic pen comprises: a press switch 103 that is in an ON-state when a pressure applied on a pen tip exceeds a predetermined threshold; a signal processing circuit 104 that converts the pressure applied on the pen tip into a signal; and a power-saving control part 107 that performs state transition of the power consumption mode of the signal processing circuit 104 from a power-saving mode to an operation mode based an ON/OFF state of the press switch 103. The predetermined threshold is smaller than a pressure generated by the own weight of an electronic pen 100. The power-saving control part 107 transitions from the power-saving mode to the operation mode when while in the power-saving mode the press switch 103 transitions from the ON-state to the OFF-state.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electronic pen, an electronic pen holder, and a coordinate input device, and more particularly to power saving of the electronic pen.

  A so-called “electronic information board” product in which a touch panel is mounted on a large display having a size of about 40 inches to 60 inches using a flat panel such as liquid crystal or plasma or a projector is on the market. A typical external appearance of the electronic information board is shown in FIG. These products can be used for presentations in meetings, etc., by connecting a personal computer and displaying a large screen of the connected personal computer. Using the built-in touch panel function, a “computer operation function via the touch panel” is provided to operate the personal computer displaying the screen by directly touching the displayed screen instead of using the mouse. Yes. In addition, electronic blackboard application software that runs on a connected personal computer is provided with these devices. This application software provides a screen that acts as a blackboard and draws handwritten characters on the touch panel on it. For example, a “handwriting function via a touch panel” is provided.

  The touch panel used in these electronic information boards can handle large screens such as 50 inches, and there is no need to attach a film-like mechanism to the display surface in order not to impair the image quality of flat panel displays such as liquid crystal displays and plasma displays. For this reason, an optical touch panel is often used. Examples of optical touch panels include, for example, “IT Fer (registered trademark)” manufactured by IT Corporation, “Touch Data (registered trademark) series” manufactured by Minato Electronics, “Display Touch Screen (registered trademark)” manufactured by next window, “Carol Touch (registered trademark)” and the like are already known. As specific product examples using these optical touch panels, for example, Hitachi Software Engineering's "Starboard (registered trademark)" and Pioneer's "Cyber Conference (registered trademark)" are already known. . Furthermore, for example, Patent Document 1 is already known in an open gazette of an optical touch panel.

  The optical touch panel used in these is, as described in the above-mentioned publicly known document, any “pen-shaped stick or finger (hereinafter referred to as a stylus) that blocks or reflects light”. It can be touched or written even if using. This provides great convenience for the user because no stylus material is chosen.

  In these optical touch panels, whether or not the stylus has been inserted into the display surface, that is, whether or not the stylus has touched the display surface is determined by the light distribution near the display surface in the process of inserting the stylus into the display surface. Detection is performed by blocking or reflecting a predetermined amount of light (probing light for the following description). That is, it is determined whether or not the intensity of light detected by a predetermined light receiving element has reached a predetermined threshold value. When it is determined that the threshold value has been reached, the touch position information at that time is issued as a mouse event to the connected personal computer to notify the personal computer of the touch position.

  However, for several reasons, such as mechanical placement accuracy between the light source and the display surface, the spread of the probe light, the spread of the image on the light receiving element due to the fact that the stylus image is not always formed on the light receiving element, etc. It is difficult to match the threshold with the position of the stylus tip with respect to the direction perpendicular to the display surface at the moment when the stylus physically contacts the display surface over all locations on the display surface. Or, in order to match, high machine accuracy exceeding a practical level is required.

  Most existing electronic information boards that use an optical touch panel are designed to allow the threshold to be set and to set the threshold just before the stylus physically touches the display surface. ing. As a result, the touch panel determines that the stylus has touched the display surface with the stylus floating slightly above the display surface from the position where the stylus physically contacts the display surface. Then, a mouse event at that position is issued. For the sake of explanation, this state is referred to as “state 1”.

  By the way, the electronic information board provides a function for handwriting characters and drawings on a display like a white board by being started on a personal computer connected with application software providing a white board function. When handwritten characters are written on the white board function application in “State 1”, physical contact of the stylus tip with the display surface cannot be detected sharply, so each side of the character (hereinafter referred to as a stroke) is written. May not be separated as intended, resulting in a stroke-like character or a whisker-like noise at the end of each stroke. This is shown in FIG. This is an example of writing the kanji “eye”.

  When the phenomenon as shown in FIG. 11 occurs, it is difficult to write characters, or the written characters are difficult to read, and the writing property is remarkably reduced as compared with a whiteboard written with conventional ink. For this reason, the performance of electronic writing on the projected electronic video, which is a feature of the electronic information board, is deteriorated. For this reason, the electronic whiteboard is not used as a substitute for the conventional white electronic board and the electronic whiteboard is used in combination. The user falls into an unavoidable situation, and the appeal of the electronic information board as a product is significantly hindered.

  In order to avoid this situation, some conventional electronic information board products are equipped with a dedicated stylus (hereinafter referred to as a dedicated pen) equipped with a pressure sensor or the like that detects that the tip is in physical contact with the display surface. Many. In the case of using a dedicated pen, when the dedicated pen blocks the light, the pen tip physically touches the display surface, and the pressure sensor installed at the pen tip detects a predetermined pressure, the touch at that time Coordinate values are issued as mouse events. This state is referred to as “state 2”. In this state, coordinates are detected only when the pen tip physically touches the display surface, so when writing characters, the strokes are well separated and the sides are connected like a single stroke. It does not become a letter, and there is no noise like a whisker at the end of each stroke.

  In general, in “state 1”, there is an advantage that writing can be performed with an opaque object that blocks light, that is, a finger or an appropriate stick. On the other hand, there is almost no problem with GUI object operations, but when writing figures and characters as in paint applications, the strokes are not decomposed well as described above, and the user intends to use the characters and figures. There is a drawback that it is difficult to write as it is.

  In “State 2”, since the touch signal is not detected unless the pressure sensor signal is detected, the GUI operation and the writing of characters and figures can be performed only with the dedicated pen, but the stroke is good as described above. Therefore, there is an advantage that characters and figures can be written as intended by the user.

  Dedicated pens (hereinafter referred to as electronic pens) used in the usage state of the “state 2” are known, and even existing touch panel products are introduced and marketed.

  In these electronic pens, when contact of the pen tip with the display surface is detected, the detected state is notified to the touch sensor by radio or wire using an electrical signal. In order to configure these mechanisms, an electric circuit mechanism is provided in the electronic pen.

  In the electronic pen, a battery is often used as a power source to drive the circuit. In order to minimize the battery consumption, for example, when the nib switch is not pressed for a predetermined time, control for shifting the circuit to the power saving mode is used. Further, when the user starts writing using the electronic pen in the power saving mode, the electronic pen detects that the pen tip switch has been pressed, and the electronic pen shifts from the power saving mode to the normal operation mode. To control.

  The above-described conventional technology detects that the pen tip switch has been pressed due to the user starting to write using the power-saving electronic pen, and the electronic pen enters the operating state. In order for the electronic circuit in the electronic pen to shift from the power saving state to the operating state, a recovery time of the order of milliseconds is necessary. On the other hand, when the user starts the writing operation and the pen tip touches the display surface, the writing operation has already started, and it is necessary to notify the system that the pen tip has touched at this point.

  However, in the conventional technology, since the time required for the electronic circuit to shift from the power saving state to the operating state is required, the coordinate signal of the coordinates is not notified during the transition time. Therefore, even if the user starts to write, he / she does not write during this time, so that he / she cannot write a short stroke such as a dot, and there is a significant discomfort due to a delay in the beginning of writing.

  In view of these, in the electronic pen used in the optical touch panel, when the user starts writing from the power saving mode state, a predetermined writing signal is notified from the moment when writing is started, and writing is delayed. An object of the present invention is to provide a mechanism for promptly shifting from the power saving mode to the operation mode so as not to occur.

  To achieve the above object, the present invention provides a pressure switch that is turned on when the pressure applied to the pen tip exceeds a predetermined threshold, a signal processing circuit that converts the pressure applied to the pen tip, and the press A power saving control unit that performs a state transition from a power saving mode with relatively low power consumption to an operation mode with relatively high power consumption based on the on / off state of the switch; The predetermined threshold is a value smaller than the pressure generated by the weight of the electronic pen, and the power saving control unit is in the power saving mode when the on state of the push switch is turned off. In addition, the power saving mode is shifted to the operation mode.

  According to the present invention, in an electronic pen used in an optical touch panel, when a user starts writing from the power saving mode state, a predetermined writing signal is notified from the moment when writing is started, and writing is not delayed. As described above, it is possible to provide a mechanism for promptly shifting from the power saving mode to the operation mode.

It is a figure which shows the structural example of an optical coordinate input device. It is a figure which shows the example of an internal structure of a light emitting / receiving means. It is a figure which shows the example of the relationship between interruption | blocking of the beam by an instruction | indication means, and distribution of the light intensity on a light receiving element. It is a figure which shows the example of the angle relationship between the light emitting / receiving means and the position of an instruction | indication means. It is a figure which shows the example which installs an optical system in the display surface etc. It is a figure which shows the structure of an electronic pen. 2 is a block diagram illustrating a configuration of an electronic pen pressure detection unit 101. FIG. 5 is a state transition diagram of the signal processing circuit 104. FIG. It is a figure (the 1) which shows the structure of an electronic pen holder. It is a figure (the 2) which shows the structure of an electronic pen holder. It is a figure for demonstrating the subject of the conventional electronic information board.

Embodiments of the present invention will be described in the following order: (1) An example of an optical coordinate input device using an electronic pen to which the present invention is applied (2) Configuration of an electronic pen to which the present invention is applied

<Principle of optical coordinate input device>
First, the principle of an optical coordinate input device to which the present invention is applied will be described. The principle described here is an example of an optical coordinate input device, and the present invention is not limited to this method. The present invention is applicable to all optical coordinate input devices. Not too long.

  FIG. 1 shows an example of an optical coordinate input device to which the present invention is applied. The coordinate input area 3 of the coordinate input device has a quadrangular shape, such as a display surface for electronically displaying an image or a whiteboard for writing with a pen such as a marker. Consider a case where the coordinate input area 3 is touched by the pointing means 2 such as a user's finger, pen, or pointing bar made of an optically opaque material. The purpose of such an optical coordinate input device is to detect the coordinates of the instruction means 2 at this time.

  The light emitting / receiving means 1 is mounted on both upper ends of the coordinate input area 3. A light beam bundle (probe light) indicated by L1, L2,..., Ln is irradiated from the light emitting / receiving means 1 toward the coordinate input area 3. Actually, it is a fan-shaped light wave that travels along a plane parallel to the coordinate input plane extending from the point light source 81.

  A retroreflective member 4 is attached to the peripheral portion of the coordinate input area 3 with the retroreflective surface facing the center of the coordinate input area 3. The retroreflective member 4 is a member having a characteristic of reflecting incident light in substantially the same direction regardless of the incident angle. For example, when attention is paid to one beam 12 among the fan-shaped plate-like light waves emitted from the light receiving / emitting means 1, the beam 12 is reflected by the retroreflecting member 4, and the same optical path is used as the retroreflected light 11 again. Proceed to return toward. The light receiving / emitting means 1 is provided with a light receiving means to be described later, and it can be determined whether or not the recurring light has returned to the light receiving / emitting means 1 for each of the probe lights L1 to Ln.

  Consider a case where the user touches the position indicated by the instruction means 2 with his hand. At this time, the probe light 10 is blocked by the hand as the instruction means 2 and does not reach the retroreflective member 4. Accordingly, the return light of the probe light 10 does not reach the light emitting / receiving means 1, and an indication on the extension line (straight line L) of the probe light 10 is made by detecting that the return light corresponding to the probe light 10 is not received. It can be detected that the means 2 has been inserted. Similarly, the probe light 13 is also emitted from the light emitting / receiving means 1 installed at the upper right in FIG. 1, and by detecting that the recursive light corresponding to the probe light 13 is not received, R) It is possible to detect that the pointing means 2 has been inserted above. If the straight line L and the straight line R can be obtained, the coordinates into which the instruction means 2 is inserted can be obtained by calculating the intersection coordinates by calculation.

  Next, the structure of the light receiving / emitting means 1 and the mechanism for detecting which probe light among the probe lights L1 to Ln is blocked will be described.

  An outline of the internal structure of the light emitting / receiving means 1 is shown in FIG. FIG. 2 is a view of the light emitting / receiving means 1 attached to the coordinate input area 3 of FIG. 1 as viewed from a direction perpendicular to the coordinate input area 3. Here, for the sake of simplicity, description will be made on a two-dimensional plane parallel to the coordinate input area 3.

  The schematic configuration includes a point light source 81, a condenser lens 51, and a light receiving element 50. The point light source 81 emits light in a fan shape in a direction opposite to the light receiving element 50 when viewed from the light source. The fan-shaped light emitted from the point light source 81 is considered to be a set of beams traveling in the arrows 53 and 58 and other directions. The beam traveling in the direction of the arrow 53 is reflected by the retroreflecting member 55, passes through the condenser lens 51, and reaches the position 57 on the light receiving element 50. Further, the beam traveling along the traveling direction of the arrow 58 reaches the position 56 on the light receiving element 50 by the retroreflective member 55. In this way, the light emitted from the point light source 81 and reflected by the retroreflecting member 55 and returning through the same path arrives at different positions on the light receiving element 50 by the action of the condenser lens 51. Therefore, when an instruction means is inserted at a certain position and a certain beam is blocked, the light does not reach a point on the light receiving element 50 corresponding to the beam. Therefore, by examining the light intensity distribution on the light receiving element 50, it is possible to know which beam is blocked.

  The above operation will be described in detail with reference to FIGS.

  In FIG. 3, it is assumed that the light receiving element 50 is installed on the focal plane of the condenser lens 51. Light emitted from the point light source 81 toward the right side in FIG. 3 is reflected by the retroreflecting member 55 and returns along the same path. Therefore, the light is condensed again at the position of the point light source 81. The condenser lens 51 is installed so that the center thereof coincides with the position of the point light source 81. Since the retroreflected light returning from the retroreflective member 55 passes through the center of the condensing lens 51, it travels along a symmetrical path to the rear of the lens (light receiving element side).

At this time, the light intensity distribution on the light receiving element 50 is considered. If the instruction means 80 is not inserted at the position shown in the drawing, the light intensity distribution on the light receiving element 50 is substantially constant, but if the instruction means 80 for blocking light is inserted as shown in FIG. The blocked beam is blocked, and a region (dark spot) having a low light intensity is generated at the position D _n on the light receiving element 50. This position D _n corresponds with the exit / incidence angle theta _n of interrupted beams, it is possible to know the theta _n by detecting the D _n. That is, θ _n is a function of D _n θ _n = arctan (D _n / f) (Equation 1)
It can be expressed as. Here, in particular, θ _n is replaced with θ _nL and D _n is replaced with D _nL in the light emitting / receiving means 1 in the upper left of FIG.

Further, in FIG. 4, the angle θ _L formed by the instruction unit 80 and the coordinate input area 3 is obtained by Expression 1 by the conversion g of the geometric relative positional relationship between the light emitting / receiving means 1 and the coordinate input area 3. As a function of D _nL
θ _L = g (θ _nL )
Where θ _nL = arctan (D _nL / f) (Equation 2)
It can be expressed as.

Similarly, for the light receiving / emitting means 1 in the upper right of FIG. 1, the L symbol in the above formula is replaced with the R symbol, and the geometric relative positional relationship between the right light receiving / emitting means 1 and the coordinate input area 3 Conversion h
θ _R = h (θ _nR )
Where θ _nR = arctan (D _nR / f) (Equation 3)
It can be expressed as.

Here, if the attachment interval of the light emitting / receiving means 1 on the coordinate input area 3 is w as shown in FIG. 4, the coordinates (x, y) of the point indicated by the instruction means 80 on the coordinate input area 3 are ,
x = w tanθ _R / (tanθ _L + tanθ _R ) (Formula 4)
y = w tanθ _L · tanθ _R / (tanθ _L + tanθ _R ) (Formula 5)
It can be expressed as.

Thus, the coordinates (x, y) can be expressed as a function of D _nL and D _nR . That is, the point indicated by the instruction means 80 by detecting the positions D _nL and D _nR of the dark spots on the light receiving element 50 on the left and right light emitting / receiving means 1 and considering the geometrical arrangement of the light receiving / emitting means 1. Can be detected.

<Example of optical system installation on display surface>
Next, an example in which the above-described optical system is installed in a coordinate input area, for example, the surface of a display will be described.

  FIG. 5 shows an embodiment in which one of the left and right light emitting / receiving means 1 described in FIGS. 1 and 2 is installed on the surface of the display 3d. The display 3d in FIG. 5 shows a cross-section, and is viewed in the direction from the negative to the positive y-axis shown in FIG. Also, A and B in FIG. 5 are displayed with the viewpoint changed as shown in the figure for explanation.

  The light emitting means among the light receiving and emitting means will be described.

  As the light source 83, a light source capable of narrowing a spot to some extent, such as a laser diode or a pinpoint LED, is used.

  Light emitted from the light source 83 toward the surface of the display 3d is collimated by the cylindrical lens 84 only in the x direction. This collimation is to be distributed as parallel light in a direction perpendicular to the surface of the display 3d after being folded back by the half mirror 87 later.

  After exiting the cylindrical lens 84, the light is condensed with respect to the y direction by two cylindrical lenses 85 and 86 whose curvature distributions are orthogonal to the cylindrical lens 84. In order to explain this state, portion A in FIG. 5 shows the arrangement of the cylindrical lens group and the condensed state of the luminous flux as viewed from the x direction with the viewpoint rotated about the z axis.

  Due to the action of the cylindrical lens group, a linearly condensed region is formed behind the cylindrical lens 86. Here, a slit 82 narrow in the y direction and elongated in the x direction is inserted. That is, a linear secondary light source 81 ′ is formed at the slit position.

  The light emitted from the secondary light source 81 ′ is folded back by the half mirror 87, and does not spread in the vertical direction on the surface of the display 3d, but is parallel light, centering on the secondary light source 81 ′ in the direction parallel to the surface of the display 3d. It progresses along the surface of the display 3d while spreading in a fan shape. The advanced light is reflected by the retroreflecting member 55 installed at the peripheral edge of the display, and returns to the half mirror 87 direction (arrow C) through the same path. The light transmitted through the half mirror 87 travels parallel to the surface of the display 3d, and enters the light receiving element 50 through the cylindrical lens 51 ′.

  At this time, the secondary light source 81 ′ and the cylindrical lens 51 ′ are conjugated with respect to the half mirror 87 (D in the same figure). Therefore, the secondary light source 81 ′ corresponds to the point light source 81 in FIG. 3, and the cylindrical lens 51 ′ corresponds to the condenser lens 51 in FIG. 5B shows the cylindrical lens and the light receiving element on the light receiving side when viewed from the z-axis direction by changing the viewpoint, and corresponds to the condenser lens 51 and the light receiving element 50 in FIG.

<Configuration of electronic pen>
FIG. 6 shows a configuration of the electronic pen 100 according to the present embodiment. The electronic pen 100 outputs a detection result by the electronic pen pressure detection unit 101 provided at the pen tip to the external signal processing unit 106 via the input interface unit 105.

  The electronic pen pressure detection unit 101 includes a movable pen tip 102 installed at the tip of the electronic pen 100, a push switch 103, and a signal processing circuit 104 that processes signals from the push switch 103.

  The movable pen tip 102 is held by the pen tip of the electronic pen 100 with a spring or the like (not shown), and when the pen tip contacts the display surface and a contact pressure is generated, the pressing switch 103 is pushed by the reaction force. ing. Alternatively, a so-called tact switch having a module configuration in which the pressing switch 103 itself has a built-in spring mechanism may be used.

  The signal processing circuit 104 sends a logic circuit that outputs true or false according to ON / OFF of the push switch 103 and a logic value output from the logic circuit to the signal processing unit via the input interface unit 105 at a predetermined rate. And an output circuit for sending out. In the following description, a true / false signal input from the electronic pen pressure detection unit 101 to the signal processing unit 106 via the input interface unit 105 is referred to as a pressure signal. That is, when the electronic pen 100 is physically in contact with the display surface, the signal processing unit 106 sets “pressure signal = true”, and otherwise sets “pressure signal = false”.

  FIG. 7 shows a functional block diagram of the electronic pen pressure detection unit 101. An infrared LED light emitting unit 105 a and an infrared LED light receiving unit 105 b in the drawing are an example of the input interface unit 105.

  In FIG. 7, a signal from the pressing switch 103 interlocked with the pressing of the movable pen tip 102 of the electronic pen 100 is notified to the infrared LED light emitting unit 105 a via the signal processing circuit 104 and converted into a predetermined light emitting pattern of the infrared LED. Then, the signal processing unit 106 is notified.

  On the other hand, the push switch signal is also notified to the power saving control unit 106. The power saving control unit 106 performs a process of shifting the entire signal processing circuit 104 to the power saving mode when the pressing switch 103 is continuously pressed for a predetermined time. The power saving mode is a power consumption mode in which the power consumption of the electronic pen 100 is reduced as compared with the normal operation mode. As a preferable example of the control in the power saving mode, there is control for stopping the light emission of the infrared LED light emitting unit 105a. Further, it may include a control for stopping the signal processing of the detected pressure by the signal processing circuit 104.

  Further, when the pressing of the push switch 103 is released during the power saving mode, the fact is notified to the power saving control unit 107, the power saving mode of the entire signal processing circuit 104 is released, and the operation mode is shifted to. Perform the process.

  FIG. 8 shows a state transition diagram of the signal processing circuit 104. As shown in the figure, the signal processing circuit 104 has two states, an operation mode and a power saving mode, and changes state when a predetermined condition is met. In the present embodiment, the condition for transition from the operation mode to the power saving mode is that the pressure switch 103 is continuously on for a predetermined time, in other words, “pressure signal = true” continues for a predetermined time. When the pressure switch 103 is off for a predetermined time, in other words, when “pressure signal = false” continues for a predetermined time. Further, the condition for transition from the power saving mode to the operation mode is when the push switch 103 is turned off from on or when it is turned on from off.

  Next, the electronic pen holder 110 that stores the electronic pen 100 will be described with reference to FIGS. 9 and 10. As shown in FIG. 9, the electronic pen holder 110 of the present embodiment has a cylindrical shape. Further, the inner diameter is a little thicker than the thickness of the electronic pen 100, so that the electronic pen 100 enters the inside of the cylinder. Further, the opening of the cylinder is positioned on the vertical upper surface, and the bottom surface of the cylinder is positioned on the vertical lower surface. The electronic pen 100 is inserted with the movable nib 102 facing down so that the movable nib 102 abuts against the bottom surface. Since the cylinder is arranged in the vertical direction, the movable pen tip 102 of the inserted electronic pen 100 is pressed against the bottom surface in the cylinder by the weight of the electronic pen 100, and the movable pen tip 102 is pressed. . Here, it is preferable to design the on load of the pressing switch 103 installed in the movable pen tip 102 to be smaller than the pressure generated by the weight of the electronic pen 100. According to this configuration, when the electronic pen 100 is inserted into the electronic pen holder 110, the push switch 103 is always on.

  Note that the inner diameter may have some play as shown in FIG. 10 as long as the movable pen tip 102 hits the bottom surface and the pressure switch 103 is turned on by the weight of the electronic pen 100.

<Summary>
In the above-described embodiment, since the transition from the power saving mode to the operation mode is started at the moment when the electronic pen 100 is lifted, the operation state can be reached at the start of writing, and writing delay does not occur.
Furthermore, when shifting to the power saving mode after the pen tip is pressed, the time required for shifting to zero is required, but the time from the start of the lifting operation to the actual writing has a margin of about 1 second. Therefore, the circuit specifications can be relaxed, and the cost can be reduced.

DESCRIPTION OF SYMBOLS 100 Electronic pen 101 Electronic pen pressure detection part 102 Movable pen tip 103 Push switch 104 Signal processing circuit 105 Input interface part 106 Signal processing part 107 Power-saving control part

JP 2008-176802 A

Claims (6)

A pressure switch that is turned on when the pressure applied to the pen tip exceeds a predetermined threshold;
A signal processing circuit for converting the pressure applied to the pen tip;
A power saving control unit that controls the state transition of the power consumption mode of the signal processing circuit from a power saving mode with relatively low power consumption to an operation mode with relatively high power consumption based on the on / off state of the push switch. When,
Have
The predetermined threshold is a value smaller than the pressure generated by the weight of the electronic pen,
The power saving control unit shifts from a power saving mode to an operation mode when the on state of the push switch is turned off in the power saving mode.   2. The power saving control unit according to claim 1, wherein the power saving control unit shifts from the operation mode to the power saving mode when the ON state of the push switch continues for a predetermined first time in the operation mode. Electronic pen.   The power saving control unit shifts from the operation mode to the power saving mode when the OFF state of the push switch continues for a predetermined second time in the operation mode. Electronic pen described in 1.   It has the cylindrical member which inserts the electronic pen of any one of Claim 1 to 3, This cylindrical member is the shape where the said electronic pen stands in a perpendicular direction when the said electronic pen is inserted. An electronic pen holder characterized by being.   5. The electronic pen holder according to claim 4, wherein when the electronic pen is inserted into the cylindrical member, the pressing switch is turned on by the weight of the electronic pen. Having at least two light emitting means for emitting probe light for scanning on the scanning surface;
It has a detection means which detects the coordinates where the pen tip of an electronic pen given in any 1 paragraph of Claims 1 points on said scanning surface using the probe light of said light emission means, It is characterized by the above-mentioned. Coordinate input device.

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