JPS62241464A - Image reader - Google Patents

Abstract

PURPOSE:To display image information on the sheet surface of an electronic blackboard device, etc., at a high speed and to read it by arranging a transmission type screen on the back of a writable light-transmissive sheet member. CONSTITUTION:A screen 4 which is a plate type member made of a light- transmissive material is arranged on the back of the sheet member 1. This screen 4 functions as a screen where an image projected by an optical image forming means is formed. The image formed on the screen 4 is transmitted through the screen 4 and displayed on the sheet member 1. A read sensor 6 is scanned at a constant speed as shown by an arrow (b) to read the image information displayed on the sheet member 1 and image information written directly on the sheet member 1.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to an image reading device capable of reading image information written on a sheet member and image information formed on the back surface of the sheet member. It is something.

<Prior Art> In recent years, iterative blackboard devices have been developed to save time and effort in transcribing image information written on a blackboard during meetings and the like.

This electronic blackboard uses a reading means to read the image information written on the sheet surface forming the board, transmits the signal to the recording means and records it on recording paper, etc.
(cathode ray tube), etc.

<Problems to be Solved by the Invention> In the electronic whiteboard device described above, if it is possible to display aha prepared in advance on the sheet surface and read it,
The efficiency of meetings can be further improved without the hassle of writing on the spot. For this purpose, methods have been considered in which image information is written onto the sheet surface using electrical signals via an FD (flexible disk), etc., but since the display surface is large, it is difficult to write at high speed. There are problems in that it is difficult and expensive.

The present invention solves the above-mentioned conventional problems and provides an image reading device capable of displaying and reading image information at high speed on a sheet surface of an electronic whiteboard device or the like.

<Means for Solving the Problems> The means of the present invention for solving the above conventional problems includes a writable translucent sheet member, a transmissive screen disposed on the back side of the sheet member, and the screen. The sheet member is characterized by being provided with an optical imaging means for projecting image information on the back surface of the sheet member, and a reading means capable of reading the image information displayed on the sheet member.

<Operation> According to the above means, when image information prepared in advance is projected onto the back of the screen by an optical imaging means such as an OHP (over head projector), the image information is transmitted through the screen and onto the sheet member. Since the information is projected onto the sheet, image information can be displayed at high speed on the sheet surface without being written on the spot, and this image information can be easily read by scanning with a reading means.

<Example> Next, an embodiment of the present invention to which the above means is applied will be described.

FIG. 1 is a schematic explanatory diagram of an embodiment of the electronic whiteboard, and FIG. 2 is a schematic explanatory diagram of an optical imaging means.

In the figure, 1 is an endless sheet member that forms the display surface of the electronic blackboard, and is made of a translucent material made of a base made of polyethylene terephthalate, polypropylene, or polyester, coated with Teflon or silicone. It has a belt shape and is stretched between a driving roller 3a driven by a motor 2 and a driven roller 3b, and is configured to rotate in the direction of arrow a as the driving roller 3a rotates.

Further, on the back surface of the sheet member 1, a screen 4, which is a plate-like member made of a light-transmitting material, is disposed. This screen 4 has a function of supporting the back surface of the sheet member 1 when image information is written on the sheet member 1, and also has a function as a screen for forming an image projected by an optical imaging means to be described later. are doing.

Next, the optical imaging means 5 for projecting the image information prepared in advance onto the screen 4 is constructed as shown in FIG. 2, for example. That is, when a transparent film 5a on which image information is written is placed on a film stand 5b and light is irradiated onto the film 5a by a light source 5d turned on by a light source control device 5C, the transmitted light is transmitted to a full mirror 5e and an imaging lens 5. It is configured to project onto the front of the screen 4 via the Datsuham mirror 5g.

Therefore, the image information written on the transparent film 5a is enlarged and formed on the screen 4, and the image is transmitted through the screen 4 and displayed on the sheet/member l.

According to the optical imaging means 5, image information prepared in advance can be immediately displayed on the sheet member 1, and can be displayed in an overlapping manner with image information directly written on the sheet member 1. Furthermore, by displaying a predetermined format on the surface of the sheet member using the optical imaging means 5, it becomes possible to erase only the directly written image information without erasing the formant.

Further, a reading sensor 6 for reading image information on the sheet member l is provided on the front side of the sheet member l. The reading sensor 6 has approximately the same length as the width of the sheet member 1, and is configured to optically read image information written on the sheet member 1 moving in the direction of arrow a.

An example of the structure of the reading sensor 6 is shown in FIG. 3(A), in which a signal electrode 6a and a common electrode 6b made of an amorphous silicon layer are formed in a comb shape. This amorphous silicon layer can be considered to have a high resistance whose conductivity changes depending on the light intensity as shown in FIG. is converted into a current change, and an image is read by storing charge for a certain period of time in a capacitor (not shown) connected to each signal electrode 6a.

The reading sensor 6 is configured to be able to scan in the direction of the arrow along a track 6c provided along the scanning path of the sheet member l.

Further, the reading sensor 6 is connected to a control section 7. This control section 7! The image information read by the reading sensor 6 is transmitted to a control section 7, and from the control section 7 to a predetermined output device 8.

The output device 8 includes a printer that records the read image information on a recording paper or the like, and also stores image information for one screen written on the sheet member 1 in a built-in memory and outputs it to a CRT. A CRT monitor for display, a file device for recording read image information on a medium such as a floppy disk, etc. can be used.

Next, a case will be described in which an image displayed on the apparatus configured as described above is read.

First, when reading an image written directly on the sheet member 1 with a pen or the like, the film 5a is removed from the film stand 5b of the optical imaging means 5, the light source 5d is turned on, and the light is directed through the screen 4 onto the sheet member. Uniformly irradiate the back surface of l. In this state, when the driving roller 3a is driven and rotated to move the sheet member 1 at a constant speed in the direction of arrow a,
When the image on the sheet member 1 passes through the reading sensor 6 position, it is read by the sensor 6.

Therefore, the reading sensor 6 can directly read the image information on the sheet member l without requiring a dedicated light source.

Next, when reading the image information displayed from the back side of the sheet member 1 by the optical imaging means 5, the reading sensor 6 is scanned at a constant speed in the direction of the arrow in FIG. The displayed image information of the film 5a and the image information directly written on the sheet member 1 can be read.

The image information read as described above is processed by a predetermined output device 8.

As described above, according to the above embodiment, it is possible to directly write on the sheet member l, and image information prepared in advance can be immediately displayed on the sheet member l by the optical imaging means 5. The sensor 6 reads the image
It can be read and processed using .

In the above-described embodiment, the optical imaging means 5 forms an image of the transmitted light of the light irradiated onto the transparent film 5a, but in this case, a normal document is irradiated with light and the reflected light is converted into an image. It may be arranged to form an image.

Further, in the above-described embodiment, the image information written on the film 5a is enlarged and projected onto the screen 4 through the lens 5'', but if a zoom lens is used as the lens 5r, the image information Information can be enlarged or reduced at will.

Further, in the above-mentioned embodiment, an example of a sensor using amorphous silicon was shown as a reading means, but the present invention is not limited to this, and reading may be performed using other methods such as COD. .

<Effects of the Invention> As described above, the present invention allows a predetermined image to be formed on a writable sheet member using an optical imaging means, so that image information prepared in advance can be immediately displayed on the sheet member. It is also possible to display an overlay by overlapping the image information written directly on the sheet member. Furthermore, the image information displayed on the sheet member can be read by a reading means, and the light source of the optical imaging means can be used for this reading, so there is no need for a light source dedicated to the reading means as in the past. It exists.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an embodiment of an electronic blackboard which is an embodiment of the present invention, FIG. 2 is a schematic explanatory diagram of an optical imaging means, and FIG. 3 is a configuration explanatory diagram of a reading sensor. ■ is a sheet member, 2 is a motor, 3a is a drive roller, 3
b is a driven roller, 4 is a screen, 5 is an optical imaging means,
5a is a film, 5b is a film stand, 5c is a light source control device, 5d is a light source, 5e and 5g are mirrors, 5f is a lens,
6 is a reading sensor, 6a is a signal electrode, 6b is a common electrode, 6c is a track, 7 is a control section, and 8 is an output section. Figure 2

Claims (1)

[Claims] A writable translucent sheet member, a transmissive screen disposed on the back surface of the sheet member, an optical imaging means for projecting image information onto the back surface of the screen, and image information displayed on the sheet member. An image reading device comprising: a reading means capable of reading the image;