JPH08142581A - Screen to be combinedly used as writing board - Google Patents

Abstract

PURPOSE: To provide a screen to be combinedly used as a writing board, that is, it can be used as a writing board and also as a screen by turning over the front and back. CONSTITUTION: A product is composed of a writing board 1 and a screen placed on the back of the board 1. Besides, the screen 2 is preferably composed of a polarizing screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing board / screen which can be used as a writing board by reversing the board and can also be used as a screen.

[0002]

2. Description of the Related Art As a way of proceeding with explanations at conferences and lectures, in order to accurately convey the content to the audience, the main points of the content are written down on a writing board such as a whiteboard or a blackboard,
Images such as slides, video images, and movies may be projected on the screen.

[0003]

Since the writing board and the screen are separate from each other, a space for arranging the writing board and the screen is required when both are used, and the indoor space that can be effectively used is narrow. There is a problem of becoming.

When both a writing board and a screen are used, they are not usually used at the same time.
When switching between the writing board and the screen, one or both of them are moved to an appropriate position, or the audience changes the direction of the line of sight between the writing board and the screen, which are respectively placed at predetermined positions. .

Moving one or both of the writing board and the screen is time consuming, there is a problem that the flow of the lecture is stopped during this period, and it is also troublesome for the speaker or his assistant. .

When changing the line-of-sight direction, the lecture can be continued without stopping the flow, but the speaker sometimes has to move between the writing board and the screen, and the line-of-sight direction is changed for the audience. It is troublesome to change.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a writing board / screen which can be used as a writing board or a screen by turning the board over. To do.

[0008]

In order to achieve the above-mentioned object, a writing board / screen according to the present invention comprises a writing board and a reflecting material, a polarizing plate and a diffusion film which are sequentially laminated on the back surface of the writing board. And a polarizing screen.

[0009]

The function of the writing board / combined screen of the present invention can be exerted as a writing board by using the writing board toward the audience. When the screen is turned upside down, the polarizing screen faces the audience. It can exert its function as.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of a writing board / screen according to an embodiment of the present invention with reference to the drawings.

As shown in the schematic sectional view of FIG. 1, this writing board / screen also comprises a board B in which the writing board 1 and the screen 2 are joined to each other at their back surfaces, and a support frame 3 shown in FIG.

The writing board 1 may be any board that can be written with chalk, ink, etc. and that can be erased by wiping the written characters, drawings, etc., such as a blackboard, green board, white board, etc. As an example thereof, in this embodiment, the writing board 1 is composed of a whiteboard which has been widely used in recent years.

The construction of the writing board 1 is not particularly limited, but as shown in detail in FIG. 2, a cold-rolled coil steel sheet (cold coil) is galvanized on both sides of the galvanized steel sheet 1a. A chemical conversion film 1b made of zinc phosphate, a primer 1c containing an epoxy resin as a main component, a base coat 1d containing a polyester resin as a main component, and a top coat 1e containing a special acrylic resin as a main component are sequentially formed on the front surface side, and the back surface side In addition, a structure in which a chemical conversion coating 1f made of zinc phosphate and a backside coating 1g containing a polyester resin as a main component are sequentially formed is provided.

The method for manufacturing the writing board 1 is also not particularly limited, and it is manufactured, for example, by the procedure shown in the flow chart of FIG.

That is, first, the cold coil is galvanized (S1) to form the galvanized steel sheet 1a, and then chemical conversion treatment is performed on both surfaces to form the chemical conversion coatings 1b and 1f (S2).

After that, the primer 1c and the base coat 1
d, the back coat 1g, and the top coat 1e are sequentially coated (S3 to S5), and protective films are attached to both front and back surfaces (S6) to obtain a product coil.

Then, the product coil is sheared in a predetermined size (S7) to obtain the writing board 1 as a product, that is, a white board.

The screen 2 may be any film capable of projecting movies, slides, magic lights, and the like, and examples thereof include a bead screen, a pearl screen, a white screen, a high-intensity screen, and a polarizing screen.

As shown in Table 1, among these, the high brightness screen has the highest screen gain (brightness), but since the surface to which the screen is attached must be curved, a flat surface such as a whiteboard is required. Since a polarizing screen is most suitable as the screen to be attached to the screen, a polarizing screen is used as the screen 2 in this embodiment.

[0020]

[Table 1]

The screen 2 may be arranged on the back side of the writing board 1, and the writing board 1 and the screen 2 may be arranged.
Although an appropriate space may be provided between the board B and the board, in this embodiment, the board B is thinned and the writing board 1 having high rigidity is used as a reinforcement for the screen 2 in FIG.
As shown in (1), the protective film on the back surface is attached to the back surface of the writing board 1 which has been peeled off.

The screen 2 made of this polarizing screen is made up of, for example, a reflector 2a made of aluminum foil and a polarizing plate 2.
b and a diffusion film 2c made of, for example, a vinyl chloride film, which is attached to the writing board 1 as a laminate in which the reflection material 2a, the polarizing plate 2b, and the diffusion film 2c are laminated in advance.

The support frame 3 includes a pair of left and right legs 3a extending in the front and rear direction, a pair of left and right columns 3b standing up from the center of the legs 3a in the front-rear direction, and an intermediate height between the left and right columns 3b. It is provided with a horizontal frame 3c connecting the two, a saucer 3d fixed to the upper surface of the horizontal frame 3c, and free wheels 3d supported at the front and rear ends of each leg 3a.

Two mortises are formed at the lower end of each column 3b. After inserting the two mortises into the leg 3a from above, one bolt 3e inserted from the lower side of the leg 3a is provided at the lower end. The support 3b is fixed to the leg 3a by screwing and calling.

Further, the horizontal frame 3c is fixed to the support column 3b by screwing up a pair of upper and lower bolts 3f which are inserted from the outside of each support column 2b to each end and bringing them together. The board B is provided with a peripheral frame 4 that surrounds the four circumferences thereof, and a fulcrum pin 5 is fixed to the center of the left and right side frames 4a and 4b of the peripheral frame 4 in the longitudinal direction.

Each fulcrum pin 5 is rotatably inserted into a pin hole 3g formed on the inner surface of the upper end of each support column 3b of the support frame 3.

Further, the rotation stop grips 3 are attached to the columns 3b.
h is inserted into the upright end of the board B so as to be able to advance and retreat, and a rubber pad 3i fixed to the inner end of the anti-rotation grip 3h is pressed against the lower end of the board B. B can be fixed almost upright.

According to the screen also used as the writing board,
When the board B is upright and fixed to the support frame 3, either the writing board 1 or the screen 2 faces forward.

When the writing board 1 is facing forward, letters and drawings can be written on the writing board 1 with a chalk, a pen or the like, and the written letters and drawings can be erased with an eraser. Can be erased.

Further, when the screen 2 faces forward, an image can be projected from the front by a liquid crystal projector, a projector, an overhead projector (OHP), a phantom lamp, or the like.

When the rotation stop grip 3h is screwed by hand to move the pad 3i away from the peripheral frame 4 of the board B, the board B can be easily turned over easily and in a short time. Screen 2 facing backwards
Alternatively, the writing board 1 can be turned to the front, and then the rotation stop grip 3h is manually screwed in the opposite direction to press the pad 3i against the peripheral frame 4 of the board B to fix the board B in the upright state. it can.

Therefore, the installation space for the writing board 1 and the installation space for the screen 2 can be shared, and the indoor space that can be effectively used can be expanded.

Further, since the writing board 1 and the screen 2 can be switched in a short time, the lecture and the explanation can be continued with almost no interruption, and moreover, the lecturer or the presenter need to move and the audience can be moved. Since there is no need to shift the line of sight, the lecturer or the presenter and the audience can smoothly give lectures and explanations.

Further, since the supporting frame 3 for the writing board 1 and the screen 2 can be used as the other, the facility cost can be reduced.

In particular, in this embodiment, since a polarizing screen is used as the screen 2, a bright screen can be seen, and 50% of the room illumination is blocked by the polarizing plate 2b, so that an image with a high contrast can be viewed even in a bright room. In addition, since the viewing angle is wide, many audiences can view the same image at the same time.

Further, in this embodiment, since the support frame 3 is provided with the free wheel 3d, it can be easily moved to the room or another room.

[0037]

As described above, according to the writing board / screen of the present invention, the writing board and the screen are fixed so as to be opposite to each other. Can also be used as

As a result, the installation space for the writing board and the installation space for the screen can be shared, so that the effective use space in the room can be expanded.

Further, since the supporting frame of the writing board and the supporting frame of the screen are used in common, the cost can be reduced and the equipment cost can be reduced.

Furthermore, since the function as a writing board and the function as a screen can be switched simply by reversing the board, the function can be switched easily, easily and in a short time. It can be continued with almost no interruption, and since there is almost no need to move the speaker or presenter or change the direction of the line of sight of the audience, the lecture or explanation can be smoothly conducted for both the lecturer or presenter and the audience. It will be performed continuously.

In the present invention, particularly when a polarizing screen is used as the screen, since the screen is bright and 50% of the room illumination is blocked by the polarizing plate, an image with high contrast can be viewed even in a bright room.
Also, since the viewing angle is wide, a large number of audiences can view the same image at the same time.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a board of the present invention.

FIG. 2 is a schematic sectional view of a writing board of the present invention.

FIG. 3 is a flow chart of a manufacturing process of the writing board of the present invention.

FIG. 4 is an exploded perspective view of the present invention.

[Explanation of symbols]

 1 Writing board 2 Screen

Claims (2)

[Claims] 1. A screen also serving as a writing board, comprising a writing board and a screen arranged on the back surface of the writing board. 2. The screen also serving as a writing board according to claim 1, wherein the screen is a polarizing screen.