JPS61182995A - Blackboard having copying function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a blackboard with a copying function that can be used for educational and conference purposes.

BACKGROUND OF THE INVENTION Blackboards have been frequently used for educational and conference purposes, but recently blackboards with a copying function have been developed that have the ability to hard copy characters, figures, etc. written on the blackboard.

Hereinafter, a conventional blackboard with a copying function will be explained with reference to FIGS. 3, 2, and 5.

In the figure, reference numeral 1 denotes a case of a blackboard with a copying function, and inside thereof there are provided a conveyance roller 3b for conveying an endless drawing sheet 2 and a driven roller 3a driven by the conveyance roller 3b. - For example, the drawing sheet may be a polyester film coated with Teflon. . or,
Reference numeral 4 denotes a light source that illuminates the surface of the drawing sheet that is being wound up, and uses a fluorescent lamp. 5 is a mirror that reflects the reflected light from the drawing sheet. 6 is a lens that condenses the reflected light from the mirror 5;
An image is formed on an image sensor 7 such as a coupled device). 8, a reflecting plate arranged to reflect the light from the light source 4 and illuminate the image reading surface 2a on the drawing sheet.

The operation of the conventional blackboard with a copying function constructed as described above will be explained below.

The drawing sheet 2 on which characters, figures, etc. are written is conveyed to the conveying roller 3b.
The image reading surface 2a of the drawing sheet 2 is irradiated with the light source 4 while being conveyed in the direction of the arrow by the light source 4, and the reflected light is reflected at the boundary 5, condensed by the lens 6, and focused on the image sensor 7. The optical information is read, electrically converted into a serial analog signal, and sent to the binarization circuit 9. The binarization circuit 9 outputs a digital signal corresponding to the input analog signal to the recorder 10. The recorder 10 performs a hard copy 11 based on the electrical signals sent.

nU Problems to be Solved by the Invention As the conventional blackboard with copying function uses a fluorescent light as the light source 4, it takes time to turn on the light source 4, so when starting to use the blackboard with copying function, While the light source was on and in use, it was on continuously.

Therefore, power consumption was large and the life of the light source 4 was short.

The present invention has been made in view of these problems, and its purpose is to provide a blackboard with a copying function that consumes less power (has a long light source life).

Means for Solving the Problems In order to solve the above-mentioned problems, the blackboard with a copying function of the present invention is equipped with a timer that preheats the light source for illuminating the characters and figures written on the drawing sheet for a certain period of time and starts copying. This will start the timer at the same time.

Operation With the above-described structure, the blackboard with a copying function of the present invention preheats and turns on the fluorescent light that illuminates the drawing sheet before copying characters and figures written on the drawing sheet, and turns off the fluorescent light after copying is completed. Since they are illuminated, power consumption is low and the lifespan of fluorescent lights is not shortened.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing the structure of a blackboard with a copying function according to an embodiment of the present invention, FIG. 2 is a timing chart thereof, and FIG. 3 is a flow chart thereof. In the figure, the blackboard with a copy function of the present invention has the following additions to the conventional blackboard with a copy function shown in FIGS. 4 and 5.

A timer 12 sends a signal to a preheating signal line 14 and a lighting signal line 15 of the lamp drive unit 13. The timer 12 also sends a signal to the pulse motor driver 16.

The lamp drive unit 13 is provided with an oscillator for turning on the fluorescent lamp of the light source 4 at high frequency and a switching circuit for sending a preheating current to the heater of the electrode of the fluorescent lamp.

The pulse motor driver 16 controls the rotation of a sheet feed motor 17, which is a pulse motor.

A power source 18 sends power to the lamp drive unit 13 and pulse motor driver 16, and a sheet position sensor 19 detects when the drawing sheet 2 has come to the copying position.

Next, the operation of the timer 12 will be explained.

First, when the timer 12 starts operating, it sends a preheating signal to the lamp drive unit 13 for 3 seconds.

At the same time, a drive signal is sent to the pulse motor driver 16 to start the sheet feed motor 17.

During the above three seconds, the drawing sheet 2 reaches the copying position, the sheet position sensor 19 operates, and the sheet feed motor 17
stops.

When the above three seconds have elapsed, the timer 12 stops the preheating signal and simultaneously outputs a lighting signal for the light source 4.

After 0.2 seconds after this, that is, after the light emission from the light source 4 becomes stable, the timer 12 outputs a drive signal for the sheet feed motor 17 again, and copying is started.

The overall operation of the present invention will be explained according to the a-chart shown in FIG.

First, when copying work is started, the sheet feed motor 17 is driven and at the same time preheating of the light source 4 is started. Thereafter, the sheet feeding motor is stopped when the drawing sheet 2 reaches the copying start position, and the preheating is stopped when the preheating time has elapsed for 3 seconds.

At the same time as preheating is stopped, the light source 4 is turned on, and after 0.2 seconds, the sheet feed motor 17 is started to be driven and copying is started.

When the drawing sheet 2 reaches the copy end position, the lighting signal of the light source 4 is turned off, and at the same time, the sheet feeding motor is turned off.

Effects of the Invention As has been made clear from the above explanation, the blackboard with copying function of the present invention is equipped with a timer that preheats the light source for illuminating the characters and figures drawn on the drawing sheet for a certain period of time before copying starts. Since the timer is started at certain times, the power consumption is low and the life of the fluorescent lamp is not shortened, making it extremely effective in practice.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a blackboard with a copying function according to an embodiment of the present invention, FIG. 2 is a timing chart of the same embodiment, FIG. 3 is a flowchart of the same embodiment, and FIG. FIG. 5 is a front view showing the structure of the same embodiment and the conventional blackboard with a copying function. FIG. 5 is a block diagram of the main parts of the same embodiment and the conventional blackboard with the copying function. 1-Case 2-Drawing sheet 4-Light II 5-Mirror 6-Lens 7-Image sensor 8-Reflector 9-Binarization circuit 10-Recorder 11-Hard copy 12-Timer 13-Lamp drive unit 14-Preheating signal Line 15 Single light signal line 16-Pulse motor-Driver 17-Sheet feed motor 19-Seat position sensor Agent's name Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3rIA Figure 4 Figure 5 8-Document copy far μm2 to rod 1

Claims (1)

[Claims] (1) A drawing sheet at least partially exposed from the case, a means for transporting the drawing sheet, a light source for illuminating the surface of the drawing sheet within the case, and a preheating of the light source at the start of copying operation. a timer that cuts off preheating of the light source and turns on the light source after a certain period of time has elapsed; an image sensor that receives reflected light from the surface of the drawing sheet and reads optical information; A blackboard with a copying function, comprising a recording device that obtains a copy of the surface of the drawing sheet by recording.