JPH0523666B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD 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. Conventional technology Traditionally, in order to increase the efficiency 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: the blackboard surface moving type and the reading section moving type. The electronic whiteboard with a moving reader is superior to others in that it can be applied to commercially available blackboards. 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 block diagram thereof. In FIG. 6, 100 is a blackboard, 102 is a rail, 10
4 is a reading section that moves on the rail 102, 106 is a recording section, and 108 is a cable connecting the reading section 104 and the recording section 106. In FIG. 7, the same members as in FIG. 6 are given the same symbols, but 110
-1 to 110-4 are lenses, 112 is an image sensor, 114 is a pulse motor that moves the reading unit 104, 116 is a drive circuit for the pulse motor 114, 118 is a read drive circuit for the image sensor 112, and 120 is a drive circuit for the image sensor 112. This is a processing circuit for outputting image signals, and the above is installed in the reading unit 104. Although not shown, a fluorescent lamp is also mounted on the reading section as a light source for reading. On the other hand, the recording unit 106 includes a recording circuit 122, a recording head 124, a roll of recording paper 126, a platen roller 128, a pulse motor 130 for the platen roller 128, a drive circuit 132 for the pulse motor 130, and a control circuit 134. There is. Light from a fluorescent lamp 108 (not shown) is irradiated onto the blackboard 100 on which a written image is recorded, and the reflected light is guided to an image sensor 112 via a lens 110.
It starts with the start signal outputted by 18, and outputs the photoelectrically converted image signal to the image signal processing circuit 120.
The image signal that has been appropriately processed by the image signal processing circuit 120 is input to the recording circuit 122, which drives the recording head 124 to record the rolled recording paper 12.
Record on the rolled-out part of 6. On the other hand, the control circuit 134 outputs a pulse signal of a predetermined frequency to the motor drive circuit 116 and the reading drive circuit 118, but this pulse signal synchronizes the drive timing of the pulse motor 114 that moves the reading unit 104, and For example, the read drive circuit 118 outputs a start signal for the image sensor 112 every four pulses to synchronize the read operation. Similarly, the control circuit 13
4 also outputs a pulse signal to the recording circuit 122 and the motor drive circuit 132, and the timing when the recording circuit 122 drives the recording head 124 to record on the rolled recording paper 126, and the pulse motor 130 rotates the platen roller 128 and synchronizes the timing at which the rolled recording paper 126 is fed out. Note that the recording operation starts when the line memory in the recording circuit 122 becomes full, and the control circuit 134 detects a predetermined signal output from the recording circuit 122 to the control circuit 134 to start the recording operation. In this way, by performing a reading operation while moving the reading section 104 along the blackboard 100 and recording on the rolled recording paper 126 that is fed out according to the output image signal, the information recorded on the blackboard 100 is recorded. It is possible to obtain a reduced version of the reproduced image in which the short side length of the written image corresponds to the width of the roll of recording paper. Problems to be Solved by the Invention The Japanese Industrial Standards specify 21 types of blackboard sizes that have been commercially available as shown in Table 1. Of these, number 7 is the most commonly available.

[Table] On the other hand, the width of a roll of recording paper is generally the same as the short side length of an A4 sheet, which is 210 mm, as defined by the Japanese Industrial Standards (hereinafter referred to as JIS). Therefore, if the short side length of a No. 7 blackboard was recorded in accordance with the width of the roll recording paper, the recorded length would be 420 mm, which far exceeds the long side length of the A4 version of 297 mm. There was an inconvenience when file the reproduced image.
In other words, there was a problem in that orderly filing would not be possible unless the reproduced image was reduced to A4 size by copying it using a copying machine with a reduction function and then filed. In view of the above-mentioned problems, the present invention provides an electronic whiteboard with a movable reading section that allows selection of a first recording operation that changes the recording width to A4 size and a second reduced recording operation that changes the recording length to A4 size, making it easy to use. It provides a good electronic blackboard. 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 the short side direction of the blackboard and moves in the long side direction of the blackboard, and an arm that is attached to the arm. a reading device comprising a light source, a lens, and an image sensor; a reading drive device for driving the image sensor; a rail for moving the arm provided along the upper side of the blackboard; and a first device for moving the arm along the rail. The pulse motor and its driving means, and its width according to the input image signal are as specified in the Japanese Industrial Standards.
A recording means consisting of a recording head for recording on a roll of recording paper having the same length as the short side length of an A4 size sheet, a driving means thereof, a platen roller, a second pulse motor for driving the recording head and a driving means thereof, and a blackboard. When the short side of is recorded corresponding to the width of the roll recording paper, the recording length in the sub-scanning direction of the similar image is _L1 , and the length of the A4 size is _L2 , then from the image sensor A reduction processing means for reducing the output image signal to L ₁ /L ₂ , a switching means for switching whether or not the reduction processing means is interposed between the image sensor and the recording means, a reduction instruction button, and a reduction processing means for non-reduction. When the reading scanning line density is N ₁ and the recording scanning line density is M ₁ , the reading scanning line density during reduction is N ₂ (≒N ₁ × L ₂ ÷ L ₁ )
A reading scanning line density switching means which sets the recording scanning line density to M ₂ (≒M ₁ ×L ₁ ÷L ₂ ) at the time of reduction; It is composed of a control means for controlling the reading scanning line density switching means or the recording scanning line density switching means. Effect The present invention has the above-described configuration, and when obtaining a reduced reproduction image of a calligraphy image recorded on a blackboard, the recording width of the reproduction image is made to correspond to the short side length of the JIS/A4 version. The operation to be performed and the recording length of the playback image.
Since it is possible to select the recording operation corresponding to the long side length of the JIS/A4 version, it is easier to use.
For example, if you want to file a reproduced image as is, you can select an operation in which the recording length of the reproduced image corresponds to the long side length of the JIS/A4 version, and file the file in an orderly manner. Embodiment Hereinafter, an electronic blackboard according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic perspective view of an electronic blackboard in one embodiment of the present invention. 10 is a JIS No. 7 blackboard, 12 is an arm that extends in a direction perpendicular to the long side direction of the blackboard 10 and moves in the long side direction, 14 is a recording device, and 16 is an arm that connects the arm 12 and the recording device 14. 18 is a rail on which the arm 12 moves, and 20 is a rail for the cable 16. FIG. 2 shows a schematic vertical cross-sectional view of the arm 12, and FIG. are doing. In FIGS. 2 and 3, 22 is a 1-magnification lens array attached to the arm 12 and has a small aperture angle that is approximately the same length as the short side of the blackboard 10, and 24 is a lens array 2.
This is an image sensor in which 1,200 photoelectric conversion elements (not shown) are arranged in a line at a constant density along the line 2. Further, in FIG. 2, 26 is a wall to which the blackboard 10 is attached, 28 is a pulse motor attached to the arm 12, and 30 is attached to the rotating shaft of the pulse motor 28, and is attached to the rail 18. It is a pinion that meshes with the rack. Furthermore, in FIG. 3, 32 is a fluorescent lamp as a light source. The fluorescent lamp 32, lens array 22, and image sensor 24 constitute reading means. FIG. 4 is also a schematic block diagram of an electronic whiteboard according to an embodiment of the present invention, and the same members as those shown in FIG. 2 are given the same reference numerals. In FIG. 4, 34 is a first motor drive circuit that drives the pulse motor 28 according to the input first pulse signal, and 36 is the same as the first pulse signal input to the motor drive circuit 34. This is a read scanning line density switching circuit which receives a pulse signal and gives a start instruction to the read drive circuit 38 every predetermined number of pulse signals. The read drive circuit 38 drives the image sensor 24 in accordance with the start instruction to perform a read operation. Note that the read scanning line density switching circuit 36 gives a start instruction every 6 pulse signals when not reducing, and if the scanning line density at this time is, for example, 1.5 lines/mm, when reducing A start instruction is given, and the scanning line density at this time is 1 line/mm. Further, 42 is an image signal processing circuit that performs appropriate electrical processing on the image signal output from the image sensor 24, such as automatic background control and binarization. The pulse motor 28, motor drive circuit 34, read scanning line density switching circuit 36, read drive circuit 38, image sensor 24, and image signal processing circuit 42 described above are built into the arm 12. Next, what is built into the recording device 14 will be explained. 44 is a reduction processing circuit that reduces the total number of pixels of the image signal input for each scanning line to 2/3;
6 is a second switching circuit for selecting the presence or absence of the reduction processing circuit 44 in the image signal transmission route; 48 is provided with two line memories capable of storing image signals for one scanning line; , is a storage circuit that uses two line memories alternately and outputs a recording start signal when one line memory stores all the image signals for one scanning line, and 50 is a storage circuit whose width is equal to the length of the short side of A4 paper. 52 is a platen roller, 54 is a recording head in which the same number of recording elements as the number of reading elements of the image sensor 24 are arranged in a row, and 56 is a recording paper that is arranged in a row according to the input image signal. 58 is a pulse motor that is the driving source for the platen roller 52, and 60 is a pulse motor that drives the recording head 54 to print on the rolled recording paper 50. Therefore, it is a second motor drive circuit that drives the pulse motor 58, 62 is a selection button provided on the operation panel (not shown) for specifying the recording size, and 64 is a selection button that creates the first and second pulse signals. This is a control circuit that outputs the read scanning line density and controls the read scanning line density switching circuit 36 and the switching switch 46. The operation of the electronic blackboard having the above configuration will be explained below. First, a case of normal recording in which the short side of the blackboard 10 is recorded in accordance with the width of the roll recording paper (short side length of JIS/A4 version) will be described. When the electronic blackboard is activated when the instruction button 62 selects normal recording, the control circuit 64 causes the reading scanning line density switching circuit 36 to select the scanning line density at the time of non-reduction (1.5
2/mm), the changeover switch 46 selects no intervention of the reduction processing circuit 44, and the first
Outputs a pulse signal. Then, the first motor drive circuit 34 rotates the first pulse motor 28 to move the arm 12 in the long side direction of the blackboard 10. On the other hand, the read scanning line density switching circuit 36 gives a start instruction to the read drive circuit 38 every six first pulse signals, and the read drive circuit 38 drives the image sensor 24 . Then, an image signal for one scanning line is output from the image sensor 24 and input to the recording device 14 via the image signal processing circuit 42 and the cable 16. The input image signal passes through the changeover switch 46 and is stored in one line memory of the storage circuit 48 without going through the reduction processing circuit 44. Then, when all the image signals for one scanning line are stored in one line memory of the storage circuit 48,
The storage circuit 48 outputs a recordable signal to the control circuit 64, and also switches the internal switch to the other line memory. Then, the second pulse signal of the control circuit 64 is transmitted to the recording circuit 56 and the motor drive circuit 60.
The motor drive circuit 60 drives the pulse motor 58 according to the pulse signals,
The platen roller 52 is rotated and the rolled recording paper 50 is fed out. Then, the recording circuit 56
After the pulse signal ends, an image signal is received from the memory circuit 48, and the recording head 5 is
4 to record on the roll-shaped recording paper 50. Thereafter, normal recording is performed by repeating similar operations. The recording length in this case is 420 mm. Next, a description will be given of A4 size recording in which the recording length corresponds to the long side length of the JIS/A4 version.
The long side length of the JIS/A4 version is 297 mm, but here, for convenience, the A4 size recording length is set to 280 mm, thereby making it A size recording. First, when the instruction button 62 selects A4 size recording and the electronic blackboard is activated,
The control circuit 64 causes the read scanning line density switching circuit 36 to select the scanning line density (1 line/mm) at the time of reduction, and causes the changeover switch 46 to select the presence or absence of the reduction processing circuit 44. Outputs a pulse signal. Then, the first motor drive circuit 34 rotates the first pulse motor 28 and the arm 12
is moved in the long side direction of the blackboard 10. On the other hand, the read scanning line density switching circuit 36 gives a start instruction to the read drive circuit 38 every nine first pulse signals, and the read drive circuit 38 drives the image sensor 24 . Then, an image signal for one scanning line is output from the image sensor 24 and input to the recording device 14 through the image signal processing circuit 42 and the cable 16. The input image signal is stored in one line memory of the storage circuit 48 via the changeover switch 46 and the reduction processing circuit 44. Then, when all the image signals for one scanning line are stored in one line memory of the storage circuit 48, the storage circuit 48 outputs a recording start signal to the control circuit 64. Thereafter, similar operations are performed to record the reduced A4 size, and the recording length in that case is 280 mm. Of course, in this case, the scanning line density (6 lines/mm) on the recording means side is constant. Next, another embodiment will be described in which the reading scanning line density is constant and the recording scanning line density is switchable. FIG. 5 is a schematic diagram of an electronic blackboard according to another embodiment of the present invention, and the same parts as in FIG. 4 are given the same reference numerals. In FIG. 5, 66 is a recording scanning line density switching circuit that switches the scanning line density of the recording means according to instructions from the control circuit 64, and when not reducing, the motor drive circuit 66
A start instruction is given to the recording circuit 56 every time three second pulse signals are sent to the motor drive circuit 60, and a start instruction is given to the recording circuit 56 every time two second pulse signals are sent to the motor drive circuit 60 during reduction. Give start instructions. Next, the operation of the electronic whiteboard of this embodiment will be explained. Since the basic operation is the same as that of the embodiment shown in FIG. 4, only the differences will be explained in detail. When activated, the control circuit 64 sends a first pulse signal to the motor drive circuit 34 and gives a start instruction to the read drive circuit 38 every six first pulse signals. As a result, a reading operation is performed at a scanning line density of 1.5 lines/mm, and an image signal is input to the recording device 14. The input image signal is input to the recording circuit 48 through the reduction processing circuit 44 only during reduction. The control circuit 64 receiving the recordable signal from the storage circuit 48 supplies a recording start signal to the recording scanning line density switching circuit 66 . Then, the recording scanning line density switching circuit 66 outputs three pulse signals when not reducing, and outputs two pulse signals when reducing, to the motor drive circuit 60, and also outputs two pulse signals to the recording circuit 5.
Give start instructions to 6. As a result, a recording operation is performed, and a recording length of 420 mm is obtained at a scanning line density of 6 lines/mm when not reduced, and 9 lines/mm when reduced.
A recording length of 280 mm can be obtained at a scanning line density of . As is clear from the description of the above two embodiments, in the present invention, by providing a scanning line density switching circuit on either the reading side or the recording side, both normal recording and A4 size recording are possible. Effects of the Invention As described above, the present invention includes a blackboard, an arm that extends in the short side direction of the blackboard and moves in the long side direction of the blackboard, and a light source, a lens, and an image sensor attached to the arm. a reading means, a reading driving means for driving the image sensor, a rail for moving the arm provided along the upper side of the blackboard;
A first pulse motor that moves the arm along the rail and its driving means, and a roll of recording paper whose width is equal to the short side length of A4 size paper established by Japanese Industrial Standards according to the input image signal. A recording means comprising a recording head, a driving means for the recording head, a platen roller, a second pulse motor for driving the recording head, a driving means for the recording head, and a recording means for recording with the short side of the blackboard corresponding to the width of the roll of recording paper. between the image sensor and the recording means and the reduction processing means that reduces the image signal output from the image sensor to L ₁ /L ₂ where the recording length of the image sensor is L ₁ and the length of the A4 size plate is _L 2 . A switching means for switching between the presence and absence of the reduction processing means, a reduction instruction button, and a read scanning line density when not reduced.
N ₁ , when the recording scanning line density is M ₁ , the reading scanning line density is set to N ₂ (≒N ₁ × L ₂ ÷ L ₁ ) at the time of reduction, or the recording scanning line density at the time of reduction. A recording scanning line density switching means that sets M ₂ (≒M ₁ ×L ₁ ÷L ₂ ), and controlling the switching means and the reading scanning line density switching means or the recording scanning line density switching means according to instructions from the reduction instruction button. Since the recording width of the reproduced image of the calligraphy image on the blackboard corresponds to the short side length of the JIS/A4 version, the recording length of the reproduced image can be adjusted according to the JIS/A4 version.・A4
Since it is possible to select whether to record according to the length of the long side of the plate, the usability is improved.

[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 cross-sectional view of the same essential parts, FIG. 3 is a schematic cross-sectional view of the same main parts, and FIG. 4 is the schematic FIG. 5 is a schematic block diagram of an electronic blackboard according to another embodiment of the present invention, FIG. 6 is a schematic perspective view of a conventional electronic blackboard, and FIG. 7 is a schematic block diagram of the same. 10... Blackboard, 12... Arm, 14... Recording device, 16... Cable, 18... Rail, 20
... Cable rail, 22 ... Lens array, 24 ... Image sensor, 28, 58 ... Pulse motor, 34, 60 ... Pulse motor drive circuit, 36 ... Read scanning line density switching circuit, 3
8...reading drive circuit, 42...image signal processing circuit,
44... reduction processing circuit, 46... changeover switch,
48...Memory circuit, 62...Instruction button, 64...
...Control circuit, 66... Recording scanning line density switching circuit.

Claims (1)

[Claims] 1. A blackboard, an arm that extends in the short side direction of the blackboard and moves in the long side direction of the blackboard, a reading device that is attached to the arm and includes a light source, a lens, and an image sensor, and drives the image sensor. a reading drive means, a rail for moving the arm provided along the upper side of the blackboard, a first pulse motor for moving the arm along the rail, and a drive means for the first pulse motor. , a recording head for recording on a roll of recording paper whose width is equal to the short side length of an A4 size sheet established by the Japanese Industrial Standards in accordance with an input image signal, a driving means for the recording head, a platen roller, and a second roller for driving the recording head. L ₁ is the recording length when the short side of the blackboard is recorded in correspondence with the width of the rolled recording paper, and L ₂ is the length of the A4 plate.
reduction processing means for reducing the image signal output from the image sensor to L ₂ of L ₁ ;
a switching means for switching between presence or absence of the reduction processing means between the image sensor and the recording means, a reduction instruction button, a reading scanning line density in the non-reduction state of N ₁ and a recording scanning line density of M ₁ ; When reducing, the read scanning line density is N ₂ (≒N ₁ ×L ₂ ÷L ₁ )
A reading scanning line density switching means that sets the recording scanning line density to M ₂ (≒M 1 ×L 1 ÷L 2 ) during reduction, and a recording scanning line density switching unit that sets the recording scanning line density to M 2 (≒M ₁ ×L ₁ ÷L ₂ ) in accordance with the instruction of the reduction instruction button. 1. An electronic whiteboard comprising a switching means and a control means for controlling the reading scanning line density switching means or the recording scanning line density switching means.