JPH06347898A - Electronic blackboard - Google Patents

Abstract

PURPOSE:To easily project an image recorded on a transparent original sheet without performing troublesome setting operation, to write a character or a picture on the surface of a screen while the image is projected, and easily copy the projected image or handwritten information. CONSTITUTION:By depressing a screen changeover switch 22, a translucent sheet 13 is set in a screen frame 10a. When the transparent original sheet 26 is set on the glass plate 29 of a stage 27 and a lamp turning-on switch 24 is depressed to turn on the halogen lamp of a projector part 25, the image recorded on the original sheet 26 is projected to the sheet 13 through mirrors 38 and 39 in a main body 10. While observing the projected image, the character or the picture is written on the surface of the sheet 13 at need. By depressing a printing start switch 23, the projected image or the handwritten information is read by a scanner 15, and a hard copy 18 is printed out. When it is unnecessary to project the image, the switch 22 is depressed to set a white sheet 12 in the screen frame 10a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blackboard with an image projection function, which is capable of displaying and copying not only handwritten characters and pictures but also projected images of transparent originals.

[0002]

2. Description of the Related Art There is known an electronic blackboard which has a writing surface on which characters and pictures can be written by hand like a conventional blackboard, and which can easily make a hard copy thereof as needed. On the other hand, there is known an overhead projector (OHP) that illuminates a transparent document from below and projects an image recorded on the transparent document onto a screen installed in front.
Therefore, an electronic blackboard has been proposed in which a projected image of a transparent original is displayed on the screen and a hard copy of the image can be taken.

For example, in the electronic blackboard disclosed in Japanese Patent Laid-Open No. 63-138861, a roll-up type transparent sheet is used as a board surface, and a roll-up type white sheet is arranged behind the roll-up type transparent sheet so as to be in close contact with the transparent sheet. I am doing it. Handwritten characters and pictures are written on a transparent sheet. The OHP is provided at a position facing the board surface of the electronic blackboard, and the image projected from the OHP is displayed on the white sheet through the transparent sheet. An image sensor is provided on the white sheet, and the projection image is read as the white sheet moves. Also, handwritten information on the transparent sheet is O
Light from the HP produces a shadow picture, which is read by the image sensor.

Further, for example, a desk-top electronic blackboard disclosed in Japanese Utility Model Laid-Open No. 62-185093 has a box-shaped main body having a screen on one side, and an OHP is built in the screen, and an OHP image projected from the back is provided on the screen. The image is read by an image sensor.

[0005]

However, as described above, in the method of projecting the OHP image from the front of the electronic blackboard, the writer enters between the electronic blackboard and the OHP when writing characters or pictures on the screen. , The projection light from the OHP is blocked by the writer, and it is extremely difficult to add a character or a picture to the projected image while observing the projected image. Also,
It is necessary to prepare OHP separately, and setting is troublesome. In addition, in the box-shaped body with built-in OHP,
Although there is an advantage that characters and pictures can be added to the screen while observing the projected image, there is a disadvantage that the transparent original cannot be easily exchanged because the OHP is inside the box-shaped body. .

The present invention has been made in order to solve the above problems. It is not necessary to separately prepare an OHP, and a transparent original can be easily set, and an image recorded on the transparent original can be displayed on a screen. It is an object of the present invention to provide an electronic blackboard on which characters and pictures can be written on the surface of a screen as it is projected, and which can easily copy these projected images and handwritten information.

[0007]

In order to solve the above-mentioned problems, an electronic blackboard according to claim 1 is provided with a box-shaped main body and a front portion of the main body, and a projection image from the rear is projected and a surface is provided. A roll-shaped sheet member provided with a translucent sheet that can be written on and a white sheet for writing,
A projector unit which is provided in a part of the front surface of the main body, has a stage for placing an original, and projects a recorded image of a transparent original placed on the stage toward the inside of the main unit; An optical system that reflects the projected image and guides it to the semitransparent sheet from behind, and reads the projected image projected on the semitransparent sheet through this optical system and the handwritten information written on the surface of the semitransparent sheet and the white sheet. It is composed of a copy section for outputting these hard copies.

An electronic blackboard according to a second aspect of the present invention is provided with a box-shaped main body having a screen opening portion on the front surface, and a roll-like winding in the main body, and characters or the like on the surface through the screen opening portion. , A white sheet member for writing the white sheet member, an opening formed by cutting out a part of the white sheet member, and provided behind the white sheet member in close proximity, and through the opening of the white sheet member and the screen opening of the main body. A plate-shaped rear screen member that is exposed to the back and projects a projected image from the rear, and a stage for placing a document, which is provided on a part of the front surface of the main body, and a transparent document placed on the stage. A projector unit that projects a recorded image toward the inside of the main body, an optical system that reflects the projected image from the projector unit and guides it from the rear to a rear screen member, and a rear system via this optical system. Clean member projected projection images and white sheet, which is constituted from a copy unit which outputs the hard copy read handwritten information such as characters written on the surface of the rear screen member.

[0009]

When the transparent original is set on the stage and the projector is turned on, the image recorded on the transparent original is imaged on the semitransparent sheet through the optical system in the main body. While observing this image from the front of the main body, write letters and pictures on the surface of the translucent sheet as needed. Further, when the copy unit is operated, the projected image and handwritten information are immediately read and copied. When the projected image is unnecessary, the sheet member is moved so that the white sheet appears in the frame of the main body.

[0010]

EXAMPLE FIG. 1 showing the appearance of an example of the present invention,
A screen frame 10a is provided in the upper half of the front surface of the box-shaped main body 10, and a white sheet 12 is arranged therein. The white sheet 12 is made of a white resin sheet on which it is easy to write arbitrary characters and pictures with a whiteboard marker, and has a roll shape with a length of, for example, three sides. Then, one of them is cut out in a window shape and the semitransparent sheet 13 is adhered thereto. By moving the white sheet 12, the semitransparent sheet 13 is moved to the screen frame 10 if necessary.
It can be set to a. This semi-transparent sheet 13 is for displaying a projected image projected from the back so that it can be observed from the front of the main body 10. On the surface thereof, as with the white sheet 12, characters and pictures are written with a marker. You can also It should be noted that FIG. 1 shows the white sheet 12 being fed, for the sake of explanation.
Both the white sheet 12 and the translucent sheet 13 are visible in the screen frame 10a.

A white sheet 12 is provided in front of the screen frame 10a.
A vertically long scanner 15 for reading handwritten information or a projected image written on the semi-transparent sheet 13 is attached movably in the horizontal direction. As is well known, the scanner 15 has a large number of image sensors arranged in the vertical direction.
The image on the sheet surface thus read is converted into an electric signal and transferred to the printer unit 17. The printer unit 17 converts the electric signal into a digital signal, and through various processes, a hard copy 18 of the image is printed out. A power switch 21, a screen switching switch 22, a print start switch 23, and a lamp lighting switch 24 of the projector section are arranged above the discharge port 19 of the hard copy 18.

A projector section 25 is arranged to the right of the switches 21 to 24. This projector unit 25
The main body 10 has a stage 27 on which the transparent original 26 is placed.
It is attached so that it protrudes from the front part of the. Thereby, the transparent original 26 can be easily set. Lid 28
Is rotatably connected to the stage unit 27 by a hinge, and is closed so as to cover the stage unit 27 during projection.

FIG. 2 showing the internal structure of the projector section 25.
A glass plate 29 is fitted in the stage 27, a Fresnel lens 31 for converging illumination light is attached to the lid 28 side, and a Fresnel lens 31 is attached.
A mirror 32 is attached to the back of the. The illumination light reflected here passes through a transparent original placed on the glass plate 29, is then reflected by a mirror 33 obliquely provided on the bottom of the projector unit 25, and passes through a projection lens 34 to the main body. The light is projected toward the optical system of 10. Projection lens 34
A halogen lamp 35 that emits illumination light is arranged in the vicinity of, and a fan 36 that cools the halogen lamp 35 is arranged below the halogen lamp 35. Reference numeral 37 is a fixing member for fixing the projector unit 25 to the wall surface of the main body 10.

In FIG. 3 showing the internal structure of the main body 10,
The optical system of the main body 10 has 135
The main body 10 is composed of two mirrors 38 and 39 mounted so that their reflecting surfaces face each other at an inclination angle of 45 degrees.
Has a structure such that the projection light from the projector unit 25 does not leak to other than this optical system.

Between the mirror 39 and the white sheet 12,
A transparent plate 41 made of, for example, glass is arranged at a position that is substantially in close contact with the back surface of the white sheet 12. The transparent plate 41 maintains the flatness of the white sheet 12 and the semi-transparent sheet 13, and also serves as a writing table for handwriting with a marker on the surface of each sheet 12, 13. Reference numeral 12a is a roll of the white sheet 12, and the roll 1 is provided below this roll.
A screen feed device 42 for rotating the winding shaft of 2a is arranged. Although not shown, a drive device for moving the scanner 15 in the horizontal direction is provided in the main body 10.

To use the electronic blackboard having such a structure, the power switch 21 is first turned on. When projecting a transparent original, the screen switching switch 22 is pressed. Each time the screen change switch 22 is pressed, the white sheet 12 is fed by the screen feed device 42 one screen at a time,
After reaching the edge screen, it is sent in the opposite direction. Screen frame 1
When the lamp lighting switch 24 is pressed after the translucent sheet 13 is set to 0a, the halogen lamp 35 in the projector unit 25 is turned on. The transparent original 26 is placed on the glass plate 29 of the stage 27, and the lid 28 is closed.

The transparent original 26 is illuminated from the back surface by the illumination light reflected by the mirror 33. The illumination light that has passed through the transparent original 26 is condensed by the Fresnel lens 31, is then reflected by the mirror 32, passes through the Fresnel lens 31 again, is reflected by the mirror 33, and then is transmitted through the projection lens 34 to the inside of the main body 10. It is incident on the optical system. The projection image reflected by the mirrors 38 and 39 is transmitted through the transparent plate 41 and imaged on the semitransparent sheet 13.

While observing the projected image displayed on the translucent sheet 13, characters or pictures are written on the surface of the translucent sheet 13 with a marker of a desired color as necessary. At this time, the transparent plate 4 provided behind the translucent sheet 13
Since 1 serves as a writing table, the translucent sheet 13 can be easily written without being deformed. When the print start switch 23 is pressed, the scanner 15 starts moving in the horizontal direction and reads the projected image of the translucent sheet 13 and the characters and pictures drawn by the marker. The read image data is processed by the printer unit 17, and the image projected on the translucent sheet 13 and the hard copy 18 of handwritten characters and pictures are drawn.
Is discharged from the discharge port 19. After this, hard copy 1
When 8 is held and pulled upward, the hard copy 18 is cut off by a cutter provided in the discharge port 19.

When it is not necessary to project and display the transparent original, the screen changeover switch 22 is pushed to press the white sheet 12.
Is set in the screen frame 10a. Pictures and letters written on the surface of the white sheet 12 are printed by the print start switch 2
By pressing 3, the scanner 15 reads the hard copy, and these hard copies are output from the discharge port 19.

In the embodiment described above, the translucent sheet is attached to the opening formed in the white sheet and the projected image is projected on the translucent sheet. However, instead of the transparent plate, the transmissive sheet used in the rear projector is used. A rear type screen may be installed behind the white sheet, and the projected image may be displayed on this. In this case, the translucent sheet is not stuck to the opening formed in the white sheet, and the rear screen is exposed through this opening.

By providing a lens for reducing the spread angle of the projection light in front of the projection lens, the main body can be downsized. If the projection lens is a zoom lens, the size of the projection image formed on the semitransparent sheet can be adjusted arbitrarily. Further, a switch for copying may be provided so that a plurality of hard copies can be continuously output by the same image data.

[0022]

As described in detail above, according to the electronic blackboard of the present invention, a box-shaped main body is provided with a translucent sheet and a white sheet so as to be switchable, and a projected image projected on the translucent sheet or The handwritten information written on the surface of the semi-transparent sheet and the white sheet was read. Alternatively, a plate-shaped rear screen is provided close to the back of the white sheet so that it is exposed from the opening formed in the white sheet, and the projected image displayed on the rear screen or the surface of the rear screen or the white sheet is written. I tried to read the handwritten information. Therefore, while observing the projected image, it is possible to write characters, pictures, etc. on the semitransparent sheet or the surface of the rear screen with a marker, and also to copy these projected image and handwritten information together. Further, since the projector section is provided on the front surface of the main body, it is not necessary to separately prepare an OHP, and the transparent original can be easily set.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an electronic blackboard.

FIG. 2 is a cross-sectional view showing an internal structure of a projector unit.

FIG. 3 is a cross-sectional view showing the internal structure of the electronic blackboard.

[Explanation of symbols]

 10 Main body 10a Screen frame 12 White sheet 13 Semi-transparent sheet 15 Scanner 17 Printer section 25 Projector section 26 Transparent original document 38, 39 Mirror 41 Transparent plate

Claims (2)

[Claims] 1. A box-shaped main body having a screen opening on the front surface, a white sheet member rollably wound inside the main body, and writing characters or the like on the surface through the screen opening. A semi-transparent sheet that is provided in parallel with this white sheet member to project a projected image from the back and can write characters and the like through the screen opening, and a part of the front surface of the main body for placing a document. A projector stage that has a mounting stage and projects the recorded image of the transparent original placed on this stage toward the inside of the main body, and reflects the projected image from this projector unit and guides it from the back to a semitransparent sheet. The optical system and the projection image projected on the translucent sheet through this optical system, handwritten information such as characters written on the surface of the translucent sheet, and the white sheet are read to read these hardware codes. An electronic blackboard comprising a copy unit for outputting pee. 2. A box-shaped main body having a screen opening on the front surface, a white sheet member rollably wound inside the main body, and writing characters or the like on the surface through the screen opening. An opening formed by cutting out a part of the white sheet member is provided close to the back of the white sheet member, and is exposed to the outside through the opening of the white sheet member and the screen opening of the main body and from the back. A plate-shaped rear screen member for projecting a projected image of the image, and a stage for placing a document, which is provided on a part of the front surface of the main body. A projector section that projects toward the front, an optical system that reflects a projection image from the projector section and guides the image from behind to the rear screen member, and is projected on the rear screen member through this optical system. An electronic blackboard comprising: a projected image, a white sheet, and a copy unit that reads handwritten information such as characters written on the surface of a rear screen member and outputs a hard copy of these.