JPH0773955B2 - Electronic blackboard - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic blackboard used as a conference record automatic creation apparatus or the like.

2. Description of the Related Art Generally, this type of electronic blackboard has a writing surface that can be written / erased for multiple pages on a white sheet, and the writing surface that has been written is moved to illuminate the writing surface with a fluorescent lamp or the like. The image reflected light from is imaged on a photoelectric conversion element, for example, a CCD image sensor through a mirror, a lens, etc., and image information on the writing surface is read. The read image information can be given to the printer to obtain a hard copy.

In such an electronic blackboard, there is a copy mode that enables a standard copy mode, a 4-page copy mode, a 2-page copy mode, and a long copy mode. Here, the standard copy mode is a mode for copying one page described on the standard page of the sheet, and the 4-page copy mode and the 2-page copy mode are 4 pages and 2 pages described on the standard page of the sheet, respectively. In this mode, pages are reduced to make one copy. The long copy mode is a mode in which a plurality of pages are reduced in a continuous state including standard pages of a sheet to make one copy. In such a long-length copy mode, since it is necessary to write at a position between standard pages, it is necessary to stop the sheet not only at the standard page position but also at a position other than the standard page position. For this reason, there are those that stop the sheet at an arbitrary position, but it is unclear whether the stopped state is the position of the standard page or another position, and there is a case where erroneous entry is made. . That is,
If a standard page, such as the one that should be described on the second page in order to be used in the standard copy mode originally, is erroneously written between standard pages, for example, between the first and second pages, it will be written at a later standard copy. This is because the contents are copied in half.

The present invention has been made in view of such a point, the operator can clearly know when the stop position of the sheet is at the standard page position and when it is at a position other than the standard page position. The purpose is to obtain an electronic blackboard that can be prevented.

Structure In order to achieve the above object, the present invention is free to write and
A plurality of writing surfaces formed on an erasable sheet, means for moving the sheet, reading means for exposing and scanning the writing surface on the moved sheet, and reading the content of the read writing surface In the electronic blackboard provided with means for stopping the sheet, a means for stopping the sheet at a position other than the position of the standard page set on the sheet, a sheet stop position determining means for determining the stop position of the sheet, and the sheet Means for differentiating and displaying the stop position according to the signal from the sheet stop position discriminating means at the standard page position and at a position other than the standard page position.

An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a basic structure of an electronic blackboard, in which a rewritable white sheet 2 is provided in a blackboard main body 1 which is formed in a rectangular shape and has an opening 1a on the front surface. The front surface of the white sheet 2 is a writing / erasable writing surface 3, and the writing surface 3 is prepared on the white sheet 2 for 4 to 5 pages. Both ends of the white sheet 2 are driven by rollers 4, 5, 6, and 7, respectively.
It is wound around 8,9. These drive rollers 8 and 9 are rotatably driven by pulse motors 10 and 11 so as to freely rotate in the forward and reverse directions, whereby the writing surface 3 of the white sheet 2 is sequentially moved. Here, a back plate 12 is provided on the back surface of the white sheet 2 in the opening portion 1a. This white sheet 2 is usually wound to the left,
A reading means 13 for exposing and scanning the writing surface 3 is provided at a position A after passing the roller 5. Specifically, the writing surface 3 is slit-exposed by a fluorescent lamp 14, and the reflected light is passed through a mirror 15 and a lens 16 to a photoelectric conversion element such as CC.
The image is read on D17. The image information on the writing surface 3 thus read by the CCD 17 is printed by printing means such as a thermal printer (not shown).

Here, FIG. 2 is an expanded view of the white sheet 2. In this embodiment, the writing surface 3 is a standard page P ₁
It has been prepared 5-page as to P _5, since the fifth page P ₅ can not be moved up to the moment the exposure position A, that the content of the writing surface 3 of the fifth page P ₅ is hardcopy Can not. Therefore, only the contents of the writing surface 3 of P _{1 to} P ₄ can be copied. Then, a detection hole 18 for identifying the page is formed on the upper side of each writing surface 3 of the white sheet 2 so as to be positioned on the front page side, and a transmissive sensor when passing through the left end of the opening 1a.
It is set to be detected by 19. Here, in the present embodiment, the detection hole 18a for one page P ₁ is the detection hole ₁ for another page.
Unlike 8b-18e, it is formed by two holes and is distinguished from others. This is to search for the first page P ₁ of the writing surface 3 and set the white sheet 2 to the basic position during initialization when the power is turned on. Detection holes for other pages 18
A plurality of b to 18e are provided for one page like the detection holes 18b ₁ , 18b ₂ and 18b ₃ so that the stop position of the sheet 2 can be arbitrarily set stepwise. Further, the detection holes 18a, 18b to 18e, the sensor 19, and a counter described later form a sheet stop position determination means for determining the stop position of the sheet 2.

Next, the entire control circuit will be described with reference to FIG. First,
Direct memory access controller DMA21 is connected to CPU20 which is the center of control. on the other hand,
ROM22, RAM23, timer 24 are connected to the CPU20 and DMA21 by the address bus AB, data bus DB, and control bus CB, and further CCD17, thermal head 25,
The dynamic RAM DRAM26 also has respective controllers 27, 28,
Connected through 29. Therefore, the DMA21 is a CCD
The image data from 17 is directly transmitted to the DRAM 26 (see FIG. 4), and the data is directly transmitted from the DRAM 26 to the thermal head 25 (see FIG. 5). Further, an I / O port 30 is connected to the CPU 20 and this I / O
Connected to the port 30 are a fluorescent lamp controller 31, which controls the fluorescent lamp 14, an operating section 32, the pulse motors 10 and 11, and a pulse motor driver 34 for a pulse motor 33 which conveys thermal paper for copying.

Here, a concrete configuration of the CCD controller 27 is shown in FIG. The image data read by the CCD 17 from the writing surface 3 is first amplified by the amplifier 35, A / D converted by the A / D conversion circuit 36, image-processed by the image processing circuit 37, and binarized by the digital comparator 38. After that, the serial / parallel conversion circuit 39 converts the parallel signal into an 8-bit parallel signal and outputs it to the DRAM 26. In this way, the image data from the CCD 17 is directly stored in the DRAM 26 under the control of the DMA 21.

The construction of the operating section 32 is shown in FIG. This operating part 32
Includes a power switch 40, a copy start key 41, a stop key 42 for stopping the sheet 2 feeding, a clear key 43, +
Keys 44, -keys 45, a copy mode key 46 for designating a copy mode, page feed keys 47a and 47b for page-forwarding the sheet 2 forward and backward, and a continuous page-feed key 48 for continuously page-feeding the sheet 2 are provided. Has been. Further, among the copy modes, a display other than the standard copy mode, that is, a display 49 for the long copy mode, a display 50 for the 4-page copy mode, and a display 51 for the 2-page copy mode are provided. 52 is seat 2
Is a page display unit that displays the page of the writing surface 3 in which is appearing.

With such a configuration, the operation of the abnormality detection according to the present embodiment will be described with reference to the flowchart of FIG. First, when the power is turned on, initialization is performed to set the white sheet 2 to the basic position. That is, the detection of the detection hole 18a~18e each writing surface 3 made by the sensor 19, the first page P ₁ is moved white sheet 2 is performed until the opening 1a. At this time, the first page P ₁ cueing by detecting hole 18a for the first page P ₁ is different from the other sensing holes 18b~18e is performed. In this way, when the white sheet 2 is initialized to the basic position, that is, the writing surface 3 of the first page P ₁ is located, the white sheet 2
B line (see FIG. 2) is the exposure position A in FIG.
Will be located in. Since this B line position is a non-image position outside the writing surface of the white sheet 2, it is always the background portion (white level) of the white sheet 2.
In this state, this B line position is exposed and illuminated by the fluorescent lamp 14, and the image data at the B line position is read by the CCD 17 as initial image data and stored in the DRAM 26. The initial image data stored in this DRAM 26 is CP
If U20 reads and the data is white level, it is normal, and if it is black level, it is abnormal. The black level of the initial image data is due to the fluorescent lamp.
If 14 is not lit, it may occur in various cases such as when the CCD 17 is defective, the DRAM 26 or the like is defective, and in the end, according to the present embodiment, not only the non-illumination abnormality of the fluorescent lamp 14 but also various The abnormality can be reliably detected. When such an abnormality is detected, the abnormality processing may be performed. Therefore, it is possible to prevent the copying operation from being performed while the CCD 17 or the like is abnormal.

Next, the contents of each mode in the copy mode and the copy operation will be described. Figure 10 (a) ~ (d)
Shows the copy state in each copy mode, and FIG. 9A shows the standard copy mode. That is, the contents of one standard page on the sheet 2 are copied to one copy sheet 53 in a one-to-one relationship. FIG. 2B shows a two-page copy mode in which the contents of two pages on the sheet 2 are reduced and copied onto one copy sheet 53. FIG. 6C shows a 4-page copy mode in which the contents of 4 pages on the sheet 2 are reduced and copied onto one copy sheet 53. FIG. 3D shows the long copy mode, in which the continuous contents of a plurality of pages including the pages on the sheet 2 are reduced and copied onto one copy sheet 53.

In order to perform such processing, a reduction function is required,
In this embodiment, a part of the circuit of the CCD controller 27 is constructed as shown in FIG. First, there is provided a serial shift register 54 which receives the image signal data VIDEO from the CCD 17 in synchronization with the clock signal and outputs an 8-bit parallel signal LD. This shift register
Connected to 54 is an 8-bit D-type flip-flop 55. A D-type flip-flop 56 is connected to the clock terminal of the flip-flop 55.
A DACK (DMA acknowledge) signal which becomes L level when the operation of the DMA 21 is started is inputted to the clear terminal of the flip-flop 56, and the DRQ which is the request signal of the DMA controller is set to be cleared. An octal counter 57 is also connected to the flip-flop 56. A frequency divider 58 is connected to the octal counter 57 and the shift register 54. This frequency divider 58 is set to L by setting the reduced copy mode.
The clock signal is divided into halves when it becomes valid by the level select signal.

In such a configuration, first, the operation in the standard copy mode will be described with reference to the timing chart of FIG. The image signal data VIDEO from the CCD 17 is sent in synchronization with the clock CLK. Here, in the standard copy mode, the SELECT signal is at the H level, the frequency divider 58 does not perform the frequency dividing operation, and CLK1 becomes the same pulse as CLK. Then, the VI input to the A terminal of the shift register 54
DEO signal is 8Q, 7Q, 6Q, depending on the rising timing of CLK1 signal.
…, Sent to 1Q. Also, the CLK1 signal is an octal counter 5
It is also input to 7, and the DRQ signal goes high every 8 counts. When the DRQ signal rises, the shift register 54
The output data LD from is latched inside the flip-flop 55. Also, the DRQ signal serves as a request signal for the DMA controller, and the operation of the DMA 21 starts. DMA21
When the operation of is started, the DACK signal becomes L level,
While the DRQ is cleared and the DACK is at the L level, the CCDRD signal is at the L level and 8-bit parallel data is output from the flip-flop 55 onto the bus and written to the DRAM 26. At this time, as the data, all of the VIDEO data from the CCD 17 is written like n + 1, n + 2, ..., N + 8 ,.

On the other hand, in the long copy mode and the like, it is necessary to perform reduction copy processing, and the reduction copy mode processing is performed. This will be described with reference to the timing chart of FIG. By this mode setting, the SELECT signal becomes L level and the frequency divider 58 operates, so that CLK1 is divided into 1/2 of CLK. As a result, the data output from the flip-flop 55 on the bus is every other data such as n + 1, n + 3, ..., N + 15.

Then, the method of writing the data to the DRAM 26 by the DMA controller is as follows.
This is done by setting the number of lines of data. In the normal copy mode, all lines are written to the DRAM 26, and in the reduced copy mode, every other line is written to the DRAM 26. In this embodiment, the same DRAM 26 is used. This is done by setting the head address twice and writing the same address twice. FIG. 14 and FIG. 15 show this, and image data by the CCD 17 as shown in FIG. 14 (data of 1 line is 1-1, 1-2, 1-3, ... 2-1,2-2,2-3, ...,)), the data written to the DRAM 26 in the normal copy mode is all data as shown in FIG. In the copy mode, as shown in FIG. 15 (b), one line and one data are placed. In this way, in the reduced copy mode, image data is thinned out and written to the memory, so that data for multiple pages can be processed with the memory capacity required in the normal copy mode.

Now, the feeding process of the sheet 2 according to this embodiment will be described with reference to the flow chart of FIG. First, sheet feeding is performed by pressing the page feed key 47a or 47b in the operation unit 32. By this key input, the pulse motor 10 or 11 is turned on and the sheet feeding process is performed. During this sheet feeding, the sheet 2 can be stopped at the standard page position or at a position other than the standard page. In this stopping method, the sheet 2 can be stopped at that position immediately when the stop key 42 is pressed, or as shown in FIG. 2, a plurality of detection holes 18b ₁ to 18b can be formed on each page of the sheet 2.
b _3, 18c ₁ ~18c _3, previously formed a ~, it is also possible to be stopped stepwise first with the time of detecting one of the detection hole 18 after pressing Sutotsupuki 42. Whatever it is,
When the sheet feeding process is performed, it is checked whether the sheet 2 is stopped at the standard page position or not.
If any of the pages P _{1 to} P ₅ is the position of the standard page appearing in the opening 1a, the page display unit 52 performs the display process indicating that the page is the standard page. In this display processing, the segment 52a of the page display section 52 shown in FIG. 17 lights up and the page is displayed. On the other hand, when the sheet 2 is stopped at a position other than the standard page due to the long copy mode or the like, the page display section
At 52, non-standard page display processing is performed. In this process, unlike the case of the standard page display, the page 52 is displayed by blinking the segment 52a of the page display unit 52. As described above, the stopped state of the sheet 2 is clearly distinguished by the lighting display and the blinking display of the page display section 52, and when the normal copy mode is performed,
It is possible to prevent a mistake such that a portion other than the standard page appears, writing is performed between pages, and the written content cannot be copied. Then, in such a sheet feeding, in this embodiment, the page feeding keys 47a, 47b
Since it has a continuous page feed key 48 together with, for example, when it is desired to make P ₅ appear in the state where P ₁ appears, or vice versa, this continuous page feed key 48 together with the page feed key 47a or 47b. By pressing, the continuous sheet feeding process is performed, and the movement to the last page in the movement direction specified by the page feeding key 47a or 47b is performed by one key operation unless the stop key 42 is pressed midway. Will be done. That is, there is no trouble of operating the key for each page to move to the final page.

Effect As described above, according to the present invention, the sheet is stopped at the standard page position and the sheet is stopped at a position other than the standard page. In such a case, it is possible to prevent a mistake such as making a standard page appear and writing between the pages, which makes it impossible to copy.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view showing a schematic configuration of an electronic blackboard, FIG. 2 is a front view showing a white sheet in a developed state, and FIG. 4 to 6 are block diagrams showing transmission and reception of a part of the signals, FIG. 7 is a block diagram showing processing of image data, FIG. 8 is a plan view of the operation unit, and FIG. Is a flow chart showing the operation of detecting the presence or absence of abnormality, FIG. 10 (a)-
(D) is an explanatory view showing the processing in each copy mode, FIG. 11 is a block diagram, FIG. 12 is a timing chart in the normal copy mode, FIG. 13 is a timing chart in the reduction copy mode, and FIG. 14 is a CCD. FIG. 15 is an explanatory view of image data, FIGS. 15A and 15B are explanatory views showing stored data, FIG. 16 is a flow chart, and FIG. 17 is a plan view of a page display section. 2 ... white sheet, 3 ... writing surface, 13 ... reading means, 52 ... page display section

Claims (1)

[Claims] 1. A plurality of writing surfaces formed on a freely writable / erasable sheet, means for moving the sheets, and reading means for exposing and scanning the writing surfaces on the moved sheets to read the contents. In an electronic blackboard provided with a means for printing the content of the read writing surface, a means for stopping this sheet at a position other than the position of the standard page set on the sheet and a stop position for the sheet are determined. A sheet stop position discriminating means and a means for separately displaying the sheet stop position according to a signal from the sheet stop position discriminating means are displayed at a standard page position and at a position other than the standard page position. A characteristic electronic blackboard.