JPH069023B2 - Eraser for electronic blackboard - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eraser for an electronic blackboard in which a written image is electronically processed, and more particularly to an eraser which provides data for automatically processing erased parts. It is a thing.

(Prior Art) In a conventional coordinate-reading type electronic blackboard in which each coordinate of the image is sequentially read and stored in a memory along with writing, the eraser eraser has a circular shape and its center point By providing a transmission part for electric signals etc. for position detection and erasing the inside of a circle with a predetermined radius from the detection position, the erased part does not change regardless of the orientation of the eraser. , The method of simplifying the correspondence with the detection site was taken. When using this eraser, all the surfaces of the erase member were always in contact with the writing surface.

(Problems to be Solved by the Invention) From the viewpoint of usability, it is preferable that the eraser has a rectangular shape or a shape similar to that of the eraser, as used in a general blackboard. The eraser having such a shape has a different erase region depending on the inclination with respect to the reference line on the writing surface, but it is difficult to detect the inclination by detecting the positional relationship. .

(Means for Solving Problems) In order to solve the above problems, the present invention includes, as a first invention, at least a writing surface and a sensing portion arranged over substantially the entire back surface of the writing surface. Detecting the coordinates in the X direction and the Y direction of each part of the writing image formed on the writing surface with the use of a tool having a position indicating section that gives information indicating the position to the sensing section, In an eraser for an electronic blackboard used in an electronic blackboard that processes a written image as electrical data, position indicating portions indicating the first and second positions are provided near both ends of the contact surface of the erase member with the writing surface. An inclination sensor which is provided respectively and detects which side the straight line connecting the first and second positions is inclined with reference to the X axis or the Y axis, which is substantially the same as the vertical direction on the writing surface, and the inclination sensor. Detection result An eraser for an electronic blackboard is proposed, which has an information transmitting unit for transmitting the information to the electronic blackboard side.

Further, as a second aspect of the invention, at least a writing surface and a sense portion disposed over substantially the entire back surface of the writing surface are provided, and a position indicating portion for giving information indicating the position to the sense portion is provided. For an electronic blackboard used in an electronic blackboard that detects the X-direction and Y-direction coordinates of each part of a writing image formed on a writing surface with the use of a tool and processes the writing image as electrical data In the eraser, the position indicating portions indicating the first and second positions are provided near both ends of the contact surface of the erase member with the writing surface, and
At least one switch that changes its state when the erase member comes into contact with the writing surface is provided near each of the first and second positions, and a straight line connecting the first and second positions is a writing surface. Inclination sensor for detecting which side is inclined with reference to the X-axis or Y-axis, which is almost the same as the vertical direction, and an information transmission unit for transmitting the detection result of the inclination sensor and the state of the switch to the electronic blackboard side. We propose an eraser for the electronic blackboard with and.

(Operation) When the eraser of the first invention is used, the first and second positions are detected on the electronic blackboard side, while the straight line connecting the first and second positions is the X-axis or the Y-axis on the writing surface. The inclination sensor detects which side is inclined with reference to, and since this is transmitted to the electronic blackboard side via the information transmission unit, it corresponds to the vicinity of both ends of the contact surface with the writing surface of the erase member. It is possible to determine the erased portion based on the first and second positions.

Further, when the eraser of the second invention is used, the first and second
Is detected on the electronic blackboard side, while the straight line connecting the first and second positions is the X-axis or Y-axis on the writing surface.
The tilt sensor detects which side is inclined with respect to the axis, and which one of the erase members near the first and second positions is in contact with the writing surface, or The switch detects whether or not both erase members have come into contact with each other, and these are transmitted to the electronic blackboard side through the information transmitting unit. Therefore, the first or the two corresponding to the vicinity of both ends of the contact surface with the writing surface of the erase member are detected. It is possible to determine the erased part based on the second position or the erased part based on the first and second positions.

(Embodiment) FIG. 2 is a circuit diagram showing the operating principle of the electronic blackboard according to the present invention. In this embodiment, the magnetostriction detection method is used.

In the electronic blackboard 1, the magnetostrictive transmission medium 3 is attached to the back surface of the writing surface 2 virtually shown in FIG. 3 in layers of a set in the X direction and a set in the Y direction, and one end of each set is attached. Common to each group,
An exciting coil 4 is wound, and each of the magnetostrictive transmission media 3 is wound with a detection coil 5 for extracting an induced voltage based on a magnetostrictive vibration wave. It should be noted that the above-described configuration in which a plurality of magnetostrictive transmission media 3 each having the excitation coil 4 wound around one end and the detection coil 5 wound around the other end thereof are provided substantially parallel to each other in the X direction and the Y direction, It is called a sense unit. Further, in FIG. 2, in order to simplify the explanation,
These are shown alone for that one set, and the control of one set is shown.

When a pulse current is applied from the excitation control unit Ex to the excitation coil 4 based on a pulse signal applied from the control unit CONT in a predetermined cycle to excite the excitation coil 4, a magnetostrictive vibration wave is generated in the vicinity of the excitation coil 4 of the magnetostriction transmission medium 3, The vibration wave is transmitted to the other end at high speed (about 5000 m / sec). At this time, writing surface 2
When a writing instrument (not shown) is in contact with, the position indicating magnet 6 provided in the vicinity of the core gives a magnetic flux toward the indicated portion of each magnetostrictive transmission medium 3 in the X and Y directions. However, when the magnetostrictive vibration wave reaches the relevant portion, a predetermined peak voltage is induced in the detection coil 5. Comparator CP
Reference numeral 1 compares the detection signal of the detection coil 5 with the reference level ER, and outputs an H level signal when exceeding the reference level ER.

The pulse signal is also sent to the reset terminals R of the flip-flops FF1 and FF2 and the counters CT1 and CT2. At the same time as the excitation in the excitation control unit Ex, the negative side outputs of the flip-flops FF1 and FF2 are set to the H level, and the AND gate is used. While G1 and G2 are opened, counting of clock pulses of the clock oscillator CL is started by the counters CT1 and CT2.

At this time, when the generated magnetostrictive vibration wave reaches the portion of the magnet 6, the comparator CP1 becomes H level. The flip-flop FF1 has its J terminal receiving the potential Vcc and being at the H level, is set by receiving the H level signal of the comparator CP1 at the K terminal, and the counter CT1 stops its counting.

The control unit CONT performs the program control from the count value, the frequency of the clock oscillator CL, and the magnetostriction transmission speed,
The coordinates of the position of the magnet 6 are calculated. The counter CT2
Is also counted at the same time, but the counted value is not adopted when the writing instrument is used.

FIG. 1 is a schematic view of a rectangular eraser 7 showing a first embodiment of the present invention. As the erase member 9 attached below the synthetic resin case 8, when the core of the writing instrument described above is a marker, a sponge wound with felt is used.

The magnets m1 and m2 are attached to each end of the eraser 7 in the longitudinal direction with a predetermined space therebetween, and when the erase member 9 contacts the writing surface 2, the magnetostriction transmission is performed in the same manner as the magnet 6 in FIG. Each part is designated on the medium 3. Here, the magnets m1 and m2 are referred to as position indicating portions, and the respective indicated positions are respectively referred to as a first position and a second position.
I will call it the position of.

The tilt sensors 10 and 10 'are moved in a direction parallel to a straight line connecting the magnets m1 and m2 by the gravity of the sliders 11 and 11' and a direction perpendicular to the straight line, and one of the sensor switches 12A and 12B and 12A '. , 12B 'are actuated, or they are balanced by a spring or the like (not shown) so as not to operate when gravity does not act. In this case, the writing surface 2 is assumed to be vertically installed or used according to this, and the magnet m
When the straight line connecting 1 and m2 is parallel to the X axis of the writing surface 2, the sensor switches 12A and 12B do not operate, and Y
When parallel to the axis, the sensor switches 12A 'and 12B' are inoperative. As will be described later, this data indicating that the operation is not performed is not used.

The switches SW1 to SW4 for instructing end portions are attached to the respective corners of the eraser 7, and when the cut portions 13A or 13B at both ends of the erase member 9 are pressed against the writing surface 2, the switch set operates or one of them is operated. When only the corner is pressed, its independent switch is activated.

The infrared transmitter 14 has a switch SW for indicating these end portions.
1 to SW4 and two inclination sensors 10 and 10 'are provided on two side surfaces in the longitudinal direction of the case 8 (only one of which is shown in the drawing) based on each combination of operating states. An infrared signal is transmitted from the infrared transmission window 15.

FIG. 5 is a circuit diagram of the transmission unit 14, and the multiplexers MP1 and MP2 respectively receive the operation signals of the switches SW1 to SW4 and the sensors 10 and 10 'at their input terminals A, B and C, and their common terminals COM are , Output terminals X1 to X6 which are respectively connected to the control terminals φA and φB of the driver DV, and which decode and output the control terminals φA and φB, are connected in parallel to the input terminals I1 to I6 of the driver DV, respectively. Based on each combination of the terminals A, B, and C, the infrared light emitting element LED generates an infrared ray unique to each combination, and the infrared ray is emitted from the infrared transmitting window 15.

While the eraser 7 is in use, the magnet m in FIG.
1, m2 are opposed to the magnetostrictive transmission medium 3, and when a pulse is generated from the control unit CONT in the same manner as with the writing instrument, the flip-flops FF1 and FF2 are reset, and via the AND gates G1 and G2, Counter C
T1 and CT2 receive the clock of the clock oscillator CL and start counting. Referring to FIG. 4, when the time t1 has elapsed, the magnetostrictive vibration wave generated by the pulse is transferred to the magnet m.
When the position 1 is reached, a peak voltage is induced in the detection coil 5, and the comparator CP1 becomes H level at this time.
The flip-flop FF1 is set and the counter CT
1 stops its counting. Flip-flop FF at the same time
The J terminal 2 receives the positive output Q of the flip-flop FF1 and becomes H level.

Subsequently, when the time t2 elapses and the magnetostrictive vibration wave reaches the portion of the magnet m2, the peak voltage is induced again in the detection coil 5, the comparator CP1 becomes H level, the flip-flop FF2 is set, and the counter CT2 is set. Stops its counting.

The control unit CONT calculates two coordinates in the X-axis direction in the same manner as described above from the thus obtained count value and the like, and at the same time, separately calculates two coordinates for the Y-axis. In the vicinity of the writing surface 2, a light receiving section for receiving the infrared signal transmitted from the infrared transmission window 15 is separately provided, and the control section CO
NT receives this.

In FIG. 6, the parts of the magnets m1 and m2 are 2 by the above calculation.
FIG. 6 is an explanatory diagram for determining which one of a pair of X coordinates (denoted as x1 and x2) and two Y coordinates (denoted as y1 and y2) is used for the designation.

The magnets m1 and m2 correspond to the fact that the magnets m1 and m2 in FIG. 2 are interchanged between the case of FIG. 6 (A) and the case of FIG. 6 (B). Counter C
Since the count values received from T1 and CT2 do not change, it means that the virtual parts indicated by the crosses in FIGS. 6A and 6B are recognized at the same time.

Here, in the eraser 7, when the line connecting the magnets m1 and m2 (reference line) is used in a state of rising to the left as shown in FIG. 6 (A), the sensor switches 12A and 12A 'are used.
(Or 12B and 12B ') will turn on,
As shown in Fig. 6 (B), when it is used in an upward right direction,
The sensor switches 12A and 12B '(or 12A' and 12B) are turned on.

The control unit CONT receives an infrared signal based on the operating states of the tilt sensors 10 and 10 ', and the magnets m1 and m2 move to the position shown in FIG.
Determine whether it is in (A) or FIG. 6 (B),
On the other hand, the directions of the two types of reference lines obtained from the combination of the two X coordinates and the two Y coordinates are calculated, and the combination in which they match is determined to be the correct one.

If you want to erase the writing pattern on the writing surface 2
This is done by operating and moving the eraser 7, but the positions of the moving magnets m1 and m2 are also detected in the same manner as described above. The control unit CONT uses the magnets m1 and m2 at the start of movement.
Is defined as the first erased area, and the area surrounded by the positions of the magnets m1 and m2 obtained thereafter and the area of the erase member 9 is set as the first erased area. Areas surrounded by the positions of m1 and m2 and the positions of the magnets m1 and m2 obtained immediately before are sequentially set as the second, third, ... Erasure areas.

When only one end or a part of the erase member 9 is used, an area determined by the position of the magnet m1 (or m2) and the size of the erase member 9 according to an infrared signal based on the on / off state of the switches SW1 to SW4. Is set as the erase area.

When the inclination sensor 10 or 10 'is parallel to the X-axis of the writing surface 2 and the slider 11 or 11' is in equilibrium, the X-coordinate or Y of the portion of the magnets m1 and m2.
Since one of the coordinates is common to each other and there is no x-coordinate in FIG. 6, the above determination is not necessary.

FIG. 7 is a schematic view of an eraser as a second embodiment, in which the eraser 16 has a boat shape and magnets m1 ', m.
2 ′ and switches SW 1 ′ and SW 2 ′ for instructing end portions are provided near both ends of the case 17, respectively.

The switches SW1 ', SW2' are pressure-sensitive switches using a conductive rubber sheet as shown in principle in FIG. 8, and when one of the switches SW1 ', SW2' is pressed against the writing surface, the pressing amount is changed. The energizing current accordingly increases. The comparators CP2 and CP3 respectively receive different reference levels by the Zener diodes D1 and D2, extract two pressure-sensitive data corresponding to the compression of the erase member 18, and, like the eraser 7, transmit the data to the transmitter 14. ′ Is based on these data, infrared transmission window 1
An infrared signal is transmitted from 5 '. In the data processing in this case, the erase member 18 abuts in a substantially circular shape at the end, and the concentric circles are enlarged to correspond. When both the switches SW1 'and SW2' are turned on, the same erase range as that of the eraser 7 is set.

As shown in FIG. 9, the inclination sensor 19 in FIG. 7 has two magnets 21 each having a cylindrical shape around a segment obtained by dividing a cylindrical pressure-sensitive rubber 20 having flat electrodes on its outer and inner surfaces into four equal parts. , 22 are rolled by gravity while being pressed, and a straight line 23 having a central axis of the cylinder perpendicular to the lower surface of the erase member 18 and passing through a divided portion of the pressure sensitive rubber 20 at right angles to the central axis is erased. It corresponds to 16 major axes.

As a result, when the long axis of the eraser 16 is parallel to the X-axis or the Y-axis of the writing surface 2, the vertical line 24 coincides with the straight line 21 and the magnets 21 and 22 are located at the divided portions. As shown in the figure, a single segment is pressed, and the inclination is determined in the same manner as in the eraser 7.

Although not shown, a cylindrical member for guiding the magnets 21 and 22 is attached to the outside and inside of the pressure sensitive rubber 20.

(Effects of the Invention) As described above, according to the present invention, the eraser is formed into a rectangular shape or a shape similar to this to make it easier to use.
It is possible to read the erase range according to the shape of the eraser. Further, in the reading in the partial use of the eraser, this can be dealt with by turning the switch on and off, and there is an advantage that an eraser excellent in operability can be provided.

[Brief description of drawings]

1 (A) and 1 (B) are schematic diagrams of an eraser showing the first embodiment of the present invention, and FIG. 2 is a circuit diagram showing the operating principle of an electronic blackboard,
FIG. 3 is an explanatory view of the structure of the electronic blackboard, FIG. 4 is a time chart of the operation of each part of the circuit of FIG. 2, FIG. 5 is a circuit diagram of the infrared transmitter, and FIGS. 6 (A) and 6 (B) are FIGS. 7 (A) and 7 (B) are schematic diagrams of the eraser showing the second embodiment, and FIG. 8 is a circuit diagram relating to the end portion indicating switch in FIG. FIG. 9 is a structural diagram of the tilt sensor in FIG. 7, 16 ... Eraser, m1, m2, m1 ', m2' ... Magnet, 10, 10 ', 19 ... Tilt sensor, CONT ... Controller, SW1, SW2, SW3, SW4, SW1', SW
2 '... switch.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoichi Tsuchida 5-23-4 Sakurada, Washinomiya-cho, Kitakatsushika-gun, Saitama Prefecture Wacom Co., Ltd.

Claims (3)

[Claims] 1. A tool having at least a writing surface and a sense portion arranged over substantially the entire back surface of the writing surface, and having a position indicating portion for giving information indicating the position to the sense portion. An eraser for an electronic blackboard used in an electronic blackboard that detects the X-direction and Y-direction coordinates of each part of a writing image formed on a writing surface during use and processes the writing image as electrical data The position indicating portions indicating the first and second positions are provided near both ends of the contact surface of the erase member with the writing surface, and the straight line connecting the first and second positions is perpendicular to the writing surface. A tilt sensor for detecting which side is tilted with respect to substantially the same X-axis or Y-axis, and an information transmitting unit for transmitting the detection result of the tilt sensor to the electronic blackboard side are provided. For electronic blackboard Eraser. 2. A tool having at least a writing surface and a sense portion arranged over substantially the entire back surface of the writing surface, and having a position indicating portion for giving information indicating the position to the sense portion. An eraser for an electronic blackboard used in an electronic blackboard that detects the X-direction and Y-direction coordinates of each part of a writing image formed on a writing surface during use and processes the writing image as electrical data The position indicating portions indicating the first and second positions are provided near both ends of the contact surface of the erase member with the writing surface, and the erase member is written near each of the first and second positions. At least one switch whose state changes when contacting the surface is provided, and the straight line connecting the first and second positions is based on the X-axis or Y-axis which is substantially the same as the vertical direction on the writing surface. A tilt sensor for detecting whether the inclined side of les, eraser for an electronic blackboard, characterized in that an information transmission unit that transmits the detection result of the inclined-out sensors and the states of the switches on the electronic blackboard side. 3. The eraser for an electronic blackboard according to claim 2, wherein a switch that changes into at least three states in response to a pressing force is used.