JPH0349907Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an electronic blackboard for recording patterns of characters, figures, etc. on the board.

[Conventional technology]

In recent years, letters written on blackboards at meetings and education, etc.
Due to the growing desire to instantly record (hard copy) figures, etc., an electronic blackboard called an "electronic board" was developed and put into practical use as a type of office automation equipment. .

Conventionally, in this type of electronic blackboard, as schematically shown in FIGS. 5 and 6, a white board 1 is used.
Move the reading head section 2 upward in the scanning direction X,
On the board 1, a writing pattern A of letters, figures, etc. written with a black, red, blue, etc. felt-tip pen,
By irradiating a line of light from a light emitter made of light emitting elements such as LEDs and fluorescent tubes, and receiving the reflected light by a light receiving part made of light receiving elements such as CCD, the strength and weakness of the reflected light can be determined by electrical signals. It has a structure that converts the intensity to weak and hard copies it to thermal recording paper or the like.

[Problem that the invention attempts to solve]

However, in the case of such conventional electronic blackboards, for example, the white board 1 is used as a screen for OHP, slides, etc., and characters, etc. are written on the projection pattern B of optically projected tables, diagrams, etc. There are many machines that overwrite patterns, and in this case there was a problem that it was not possible to hard copy both patterns at the same time.

The present invention has been made under the above circumstances, and its purpose is to provide an electronic blackboard in which a hard copy of a projected pattern as well as a written pattern can be made.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the electronic blackboard of the present invention moves a reading head section including a light projecting section and a light receiving section along the white board. In an electronic blackboard for reading and hard copying a handwriting pattern written on a white board, the light emitting section and the light receiving section are separated, and the reading head section is configured such that the light receiving section is movable independently; and the white board. The relationship between the illuminance measurement light-receiving element that measures the illuminance above, the illuminance, the light amount accumulation time, and the moving speed of the light receiving section is prepared in advance in a table, and the light amount accumulation time and the light amount accumulation time are calculated based on the illuminance measured by the illuminance measurement light-receiving element. a speed setting section that determines a moving speed of the light receiving section, the light receiving section is moved independently according to the light amount accumulation time and the moving speed determined by the speed setting section, and the light receiving section is moved optically onto the white board. The system is designed to read the projected projection pattern and make a hard copy.

[Effect]

When making a hard copy of a projected pattern projected on a white board together with a written pattern, the light receiving section of the reading head section is moved independently, and the light receiving section receives the projection light reflected from the white board to read the pattern. In order for the light receiving section to receive an appropriate amount of projected light, the illuminance on the white board is measured by the light receiving element for illuminance measurement, and based on this illuminance, the light amount accumulation time and the moving speed of the light receiving section are determined in the speed setting section. . The relationship between the illuminance, the light amount accumulation time, and the moving speed of the light receiving section is prepared in advance in a table.

〔Example〕

The present invention will be explained below based on the embodiments shown in FIGS. 1 to 4. In the illustrated embodiment of the present invention, parts having the same configuration as those of the conventional electronic whiteboard shown in FIGS. 5 and 6 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In other words, the electronic blackboard is as shown in Figures 1 to 3.
As shown in the figure, the light emitting part 21 and the light receiving part 22 are separate bodies, and the reading head part 2 has the light receiving part 22 movable independently, and one or two parts are mounted on the white board 8 to measure the illuminance. or more light-receiving elements 3 for measuring illuminance, illuminance, light amount accumulation time, and the light-receiving section 22.
a speed setting unit (not shown) that creates a table in advance of the relationship between the moving speeds of and determines the light amount accumulation time and the moving speed of the light receiving section 22 based on the illuminance measured by the illuminance measuring light receiving element 3; The reading head section 2 is reciprocated in the scanning direction Alternatively, the light receiving section 22 can be moved independently. The light projecting section 21 includes a light emitting element 2 such as an LED or a fluorescent tube.
1a, the line-shaped illumination light is sent to the condensing lens 21b.
It is configured so that it can be irradiated onto the white board 1 at an arbitrary angle θ ₁ (for example, 45°) through the
The light receiving unit 22 receives the reflected light from the light projecting unit 21 through a condensing lens 22a and a light receiving element 22b such as a CCD line sensor, and images patterns such as letters and figures on the white board 1 at an arbitrary angle θ ₂ (for example,
45°). Note that 4 in the figure is an OHP that projects the projection pattern B onto the white board 1.

FIG. 4 shows another embodiment of the present invention, in which the light receiving section 22 of the reading head section 2 is replaced with a normal condensing lens and a lens 220 having a light guide function is used to obtain an OHP, a slide, etc. The light receiving unit itself has a structure that makes it difficult to block the projected light, and the light receiving element 2
2b to the white board 1 at an angle of 40° or more θ ₂
In addition, a light blocking plate 210 is provided on the light projecting section 21 to prevent external light from entering the light receiving section 22 during normal operation.

To explain the operation of the electronic blackboard with the above configuration, first, when making a hard copy of only the writing pattern A written on the board 1, the light emitting part 21 and the light receiving part 22 of the reading head part 2 are driven together to move in the scanning direction, thereby reading the writing pattern A on the white board 1 and making a hard copy. On the other hand, when making a hard copy of both the writing pattern A written on the board 1 and the projection pattern B projected by an OHP 4 or the like, first, the light receiving element 3 for measuring illuminance arranged on the board 1 The illuminance is measured, and the speed setting section determines the light amount accumulation time (scanning time for a CCD element) and the moving speed of the light receiving section 22 based on the measured illuminance. Then, decide in this way. Next, the light receiving section 22 of the reading head section 2 is separated and moved independently using the light amount accumulation time (or scanning time) and moving speed set in this way, and the writing pattern A and the projected pattern B on the white board 1 are drawn. Read and hard copy.
Note that when the projection light from the OHP 4 directly enters the light receiving section 22, the light receiving section 22 is connected to the lenses 22a, 2.
The lens 22 condenses light through the lens 20
A, 220 is installed so as to receive only the projection light reflected from the white board 1, so that this is prevented.

[Effect of idea]

The electronic blackboard of the present invention has the following effects. That is, the light emitting part and the light receiving part of the reading head section are made separate, the light receiving part is movable independently, and the light receiving element for measuring the illuminance for measuring the illuminance on the white board, the illuminance, and the light amount accumulation time are arranged. and a speed setting unit that tabulates the relationship between the moving speeds of the light receiving unit in advance and determines the light amount accumulation time and the moving speed of the light receiving unit based on the illuminance measured by the illuminance measuring light receiving element, The light receiving section is moved independently according to the light amount accumulation time and the moving speed determined by the speed setting section to read the projection pattern optically projected onto the white board and hard copy it. , this projected pattern can be hard-copied along with a written pattern written on a white board.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an embodiment of the electronic blackboard according to the present invention, FIG. 2 is a schematic plan view,
FIG. 3 is a schematic plan view showing one embodiment of the reading head section, FIG. 4 is a schematic plan view showing another embodiment of the reading head section according to the present invention, and FIG. 5 is a conventional electronic blackboard. FIG. 6 is also a schematic plan view. 1...White board, 2...Reading head section, 2
1... Light projecting section, 21a... Light emitting element, 21b, 2
2a... Condensing lens, 22... Light receiving section, 22b...
...Light receiving element, 210... Light shielding plate, 220... Lens with light guide function, 3... Light receiving element for illuminance measurement, 4...
...OHP, X...scanning direction, A...writing pattern,
B...Projection pattern.

Claims (1)

[Scope of utility model registration request] In an electronic blackboard in which a reading head section 2 including a light projecting section 21 and a light receiving section 22 is moved along a white board 1 to read a writing pattern A written on the white board 1 and make a hard copy, A reading head section 2 in which the section 21 and the light receiving section 22 are separated and the light receiving section 22 is movable independently; a light receiving element 3 for measuring illuminance for measuring the illuminance on the white board 1; The relationship between the light amount accumulation time and the moving speed of the light receiving section 22 is made into a table in advance, and the light amount accumulation time and the light receiving section 22 are calculated based on the illuminance measured by the light receiving element 3 for measuring illuminance.
a speed setting section that determines the moving speed of the
The light receiving section 22 is moved independently according to the light amount accumulation time and the moving speed determined by the speed setting section to read the projection pattern B optically projected onto the white board 1 and make a hard copy. Features an electronic blackboard.