JPH056824B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic blackboard that optically reads a written image displayed on a blackboard or whiteboard to obtain a reproduced image, and relates to an electronic blackboard that uses a moving reading section.

Conventional technology Traditionally, in order to improve the performance of meetings,
Several electronic blackboards have been proposed that automatically read images of calligraphy written on the blackboard and obtain reproduced images. Broadly speaking, these electronic blackboards can be divided into two types: a movable blackboard type and a movable reader type.

FIG. 6 is a schematic perspective view of an electronic whiteboard with a moving reading section proposed in Japanese Utility Model Application Publication No. 57-176767, and FIG. 7 is a schematic cross-sectional view showing the reading section. In FIGS. 6 and 7, 100 is a blackboard, 102 is a rail, and 104 is a rail 1.
106 is a recording section for obtaining a reproduced image, and 107 is a cable connecting the reading head section 104 and the recording section 106. In addition, in FIG. 6, 108 is a fluorescent lamp, 11
0-1 to 110-6 are spherical lenses, and 112
-1 to 112-6 are image sensors. Then, the light from the fluorescent lamp 108 is irradiated onto the blackboard 100 on which the written image is recorded, and the reflected light is guided to the image sensor 112 via the lens 110, and the image sensor 112 performs photoelectric conversion. Image sensor 11
The image signal obtained in step 2 is subjected to appropriate electrical processing and then input to the recording section 106, where it is recorded. Thereafter, the reading head section 104 is moved in the longitudinal direction of the blackboard 100 using a motor or the like, and the recording paper of the recording section 106 is moved in synchronization with the reading head section 104, and the above reading and recording operations are repeated, thereby writing on the blackboard 100. The written image is automatically read and a reproduced image of a predetermined size can be obtained. Of course, it is also possible to obtain a plurality of reproduced images by storing the image signal in a memory or the like.

Problems to be Solved by the Invention However, according to the above-mentioned conventional electronic blackboard,
With respect to the movement of the reading unit 104, the cable 10
7 may get caught on something, or the reading section 104 may hit something, which could cause the drive system of the reading head section 104 to run idly, resulting in wear and tear. There were flaws.

In this way, in the conventional electronic blackboard, the reading section 10
4 moves on the exposed surface, there is no protection against movement interference, and when interference occurs, various problems occur.

In view of the above-mentioned problems, the present invention is capable of immediately detecting any interference with the movement of the reading section of an electronic blackboard, and is capable of immediately detecting the disturbance, and is able to immediately activate the driving means of the reading section before a failure occurs in the driving system of the reading section. This provides an electronic blackboard that can be stopped.

Means for Solving the Problems In order to solve the above problems, the electronic blackboard of the present invention includes a blackboard, an arm that extends in a direction perpendicular to the longitudinal direction of the blackboard and moves in the longitudinal direction of the blackboard, and a a reading means comprising an attached light source, a lens, and an image sensor; a recording means for recording based on an image signal output by the reading means; a rail for moving an arm provided along the upper side of the blackboard;
A pulse motor that moves the arm along the rail, a drive means for the pulse motor, a rotary blade that is rotated by the pulse motor, a presence detection means that detects whether or not the rotary blade passes, and a pulse that is input to the drive means. a counting means for counting the number of pulses of the signal and the pulse signal and outputting a counting end signal after counting a predetermined number; and a predetermined signal by detecting the rising and falling parts of the output signal of the presence/absence detecting means. The edge detection means outputs an output to the reset terminal of the counting means, and the control means outputs a pulse signal and stops driving the pulse motor upon receiving a counting end signal.

Effects According to the present invention, when the movement of the arm incorporating the reading means is obstructed, the rotation of the pulse motor is stopped, and at the same time, the rotary blades interlocked with the pulse motor are also stopped, and the output signal of the presence/absence detection means is Since there are no rising and falling portions and the output signal of the edge detection means does not reset the counting means, the counting means outputs a counting end signal to the control means, and the control means stops the driving means, thereby: Various troubles that may occur in the drive system of the reading unit can be prevented.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings regarding an electronic blackboard. FIG. 1 shows a schematic perspective view of an electronic blackboard according to an embodiment of the present invention, and FIG. 2 shows a schematic vertical cross-sectional view of the main part.
FIG. 3 is a schematic cross-sectional view of the main parts, and FIG. 4 is a schematic block diagram. In Figure 1,
10 is a wall-mounted blackboard; 12 is an arm with a built-in reading means; 14 is a recording device that records a reproduced image based on the image information output by the reading means in the arm 12; and 16 is a reading stop means in the arm 12. Recording device 1
4, a first rail 18 for moving the arm 12 provided along the upper side of the blackboard 10, and a second rail 20 for storing the cable 16.

In FIG. 2, the same members as those in FIG. type lens array, 24
is an image sensor in which photoelectric conversion elements (not shown) are similarly arranged in a line along a lens array 22 at a predetermined density. Further, 26 is a wall, 28 is a pulse motor attached to the arm 12, and 30 is a pinion provided on the rotating shaft of the pulse motor 28.

In FIG. 3, the same members as in FIGS. 1 and 2 are given the same reference numerals, and 32 is a fluorescent lamp attached to the arm 12 as a reading means.

In FIG. 4, the same members as in FIGS. 1 to 3 are given the same reference numerals, but 34 is a drive circuit that drives the pulse motor 28 according to an input pulse signal, and 36 is a first drive circuit. Blackboard 1 on rail 18
The pinion 30 is provided along the longitudinal direction of the pinion 30.
38 is a rotating blade rotated by the pulse motor 28 via a pinion 30, 40 is a pair of light-emitting element and light-receiving element, and detects whether or not the rotating blade passes. 42 is an edge detection circuit that detects the rising edge and falling edge of the output signal of the sensor 40 and outputs a predetermined signal; 44 is the image sensor 24;
A reading circuit 46 counts the input pulse signals and outputs a counting end signal when a predetermined number of counts are completed, and a signal is input to the reset terminal 46a. This counter has a function of returning the counted value to the initial value. 48 is a recording circuit, 50 is a thermal recording head, 52 is a platen roller, and 54 is a roll of thermal recording paper, and these constitute the recording device 14. 56 sends out a pulse signal for driving the pulse motor 28, and the reading circuit 4
This is a control circuit that controls the operations of the reading circuit 44 and the recording circuit 48, and outputs a pulse signal and stops the operation of the reading circuit 44 and the recording circuit 48 upon receiving the counting end signal output from the counter 46.

Note that 80 represents a pulse signal output by the control circuit 56, 81 represents an output signal of the sensor 40, 82 represents an output signal of the edge detection circuit 42, and 83 represents an output signal of the counter 46.

The operation of the electronic whiteboard having the above configuration will be explained with reference to FIG. In FIG. 5, A shows the pulse signal 80 output by the control circuit 56, B shows the output signal 81 of the sensor 40, and C shows the edge detection circuit 4.
2 shows the output signal 82 of the counter 46, and d shows the output signal of the counter 46, respectively.

First, the overall operation of the electronic blackboard will be explained. At start-up, the arm 12 is positioned at either end of the blackboard 10, and when a start instruction is received, the fluorescent light 32 is turned on. Next, as shown in FIG. 5A, a pulse signal 80 is output from the control circuit 56, and the drive circuit 34 drives the pulse motor 28. Then, pinion 3
0 rotates on the rack 46, thereby arm 1
2 moves along the rail 18 in the direction of arrow A or B in FIG. At the same time, the control circuit 56 operates the reading circuit 56 in synchronization with the output of the pulse signal, the image sensor 24 is driven, and the light from the fluorescent lamp 32 is reflected from the surface of the blackboard 10 and enters through the lens array 22. converts the light into electrical signals. After being appropriately processed in the reading circuit 44, the electric signal is inputted to the recording device 14 through the cable 16, and then sent to the thermal recording paper 50 by the thermal recording head 50.
4 is printed on. Then, while feeding out the thermal recording paper 54 by the platen roller 52,
By repeating the above operations, a reproduced image of a reduced version of the calligraphy image written on the blackboard 10 can be obtained in the recording device 14.

On the other hand, since the rotary vane 38 is interlocked with the pinion 30, it rotates when the arm 12 is moving, and the sensor 40 outputs a signal 81 as shown in FIG.
is output, the edge detection circuit 42 detects the rising edge and falling edge of the signal 81, and at that timing, the edge detection circuit 42 outputs the signal 82 as shown in FIG.
It is input to the reset terminal 46a of No. 6. On the other hand, the counter 46 counts the number of pulses of the pulse signal 80, but as long as the arm 12 is moving normally, the output signal 82 of the edge detection circuit 42 will cause the counter 46 to count the predetermined number of pulses. Since it is reset to the initial value, the counter 46 does not output a counting end signal. Therefore, the electronic whiteboard can continue its normal operation.

Conversely, when the arm 12 collides with some object and the arm 12 stops moving, the rotating blade 38 stops rotating, and therefore the output of the sensor 40 remains constant, with no rising or falling portions appearing.
The predetermined signal 82 is no longer generated at the output of the edge detection circuit 42, and the counter 46 is not reset. Then, the counter 46 continues counting the number of pulses of the pulse signal 80, and sends out a counting end signal 83 when the counted value reaches a predetermined value. When the control circuit 56 receives this counting end signal 83, it stops outputting the pulse signal 80 and stops the operation of the reading circuit 44 and the recording circuit 48.

Therefore, the driving of the pulse motor 28 can be stopped before the pulse motor 28, pinion 30, and rack 48 for moving the arm 12 are broken.
Furthermore, if the movement of the arm 12 is obstructed, meaningless signals are continuously output from the reading circuit 44, and based on the meaningless signals, the recording device 14 continuously performs meaningless recording. Accordingly, this can also be prevented, and wasteful use of the recording paper 54 can be prevented.

Note that the present invention is not limited to the present embodiment, and those skilled in the art can easily modify it without departing from the spirit of the present invention.

Effects of the Invention As described above, according to the present invention, a blackboard, an arm that extends in a direction perpendicular to the longitudinal direction of the blackboard and moves in the longitudinal direction of the blackboard, a light source, a lens, and an image sensor attached to the arm are provided. a reading means, a recording means for recording based on the image signal outputted by the reading means, a rail for moving the arm provided along the upper side of the blackboard, and a pulse motor for moving the arm along the rail. , a driving means for a pulse motor, a rotary blade rotated by the pulse motor, a detection means for detecting whether or not the rotary blade passes, a pulse signal input to the driving means, and counting the number of pulses of the pulse signal. After counting a predetermined number of counts, the counting means outputs a counting end signal and detects the rising and falling parts of the output signals of the presence/absence detecting means to create a predetermined signal, and connects the counter to the reset terminal of the counting means. An edge detection means for outputting,
Since it is an electronic whiteboard equipped with a control means that outputs a pulse signal and stops outputting the pulse signal when it receives a counting end signal, it can detect when the movement of the arm is obstructed and the arm stops moving. Since the movement of the arm is stopped by the movement of the arm, it is possible to prevent problems such as damage to the arm drive system due to the interference.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an electronic blackboard according to an embodiment of the present invention, FIG. 2 is a schematic vertical sectional view of the same essential parts, FIG. 3 is a schematic cross-sectional view of the same essential parts, and FIG. 4 is also a schematic diagram. FIG. 5 is a schematic timing diagram of the block shown in FIG. 4, FIG. 6 is a schematic perspective view of a conventional electronic blackboard, and FIG. 7 is a schematic vertical cross-sectional view of the reading head of the same main part. 10... Blackboard, 12... Arm, 14... Recording device, 16... Cable, 18... First rail, 20... Second rail, 22... Lens array, 24... Image sensor, 28 ...Motor, 30...Pinion, 32...Fluorescent light, 34...
... Drive circuit, 36 ... Rack, 38 ... Rotating vane, 40 ... Sensor, 42 ... Edge detection circuit,
44...Reading circuit, 46...Counter, 56...
control circuit.

Claims (1)

[Claims] 1 a blackboard, an arm extending in a direction perpendicular to the longitudinal direction of the blackboard and moving in the longitudinal direction of the blackboard, a light source and a lens attached to the arm;
and a reading means comprising an image sensor; a recording means for recording based on an image signal outputted by the reading means; a rail for moving the arm provided along the upper side of the blackboard; a pulse motor that is moved along the pulse motor, a driving means for the pulse motor, a rotary blade rotated by the pulse motor, an existence detection means for detecting whether or not the rotary blade has passed, and a drive means for the driving means. an input pulse signal, a counting means for counting the number of pulses of the pulse signal and outputting a counting end signal after counting a predetermined number; and detecting rising and falling parts of the output signal of the presence/absence detecting means. edge detection means for creating a predetermined signal and outputting it to a reset terminal of the counting means; and control means for outputting the pulse signal and stopping outputting the pulse signal when receiving the counting end signal. An electronic blackboard equipped with