Education and demonstration – Visual art or craft – artistic adornment – or color training...
Reexamination Certificate
1999-01-29
2001-06-12
Ackun, Jacob K. (Department: 3712)
Education and demonstration
Visual art or craft, artistic adornment, or color training...
C434S428000, C446S485000
Reexamination Certificate
active
06244872
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a light-drawing type display apparatus. Particularly, it relates to a light-drawing type display apparatus which provides a plurality of light-transmitting small holes in a board each having a predetermined size; provides a light source to the back side of the board; mounts, for example, a sphere-like light-cutting member to each of the small holes; moves the light-cutting member by using a predetermined writing means or an erasing means so that the light from the light source can be transmitted or cut off: and draws predetermined characters or pictures on the board or erases them from the board. The board of the light-drawing type display apparatus according to the present invention can be applied to, for example, a board used in a council room, a black board used in a school room, a board used for an advertisement, and building materials, for example, windows, for admitting light from outside a house.
BACKGROUND ART
As conventional display apparatuses, there are known a blackboard using a chalk and a white board using a colored quick-drying ink, etc., in order to draw characters or pictures on the board.
When using chalk, there are problems, however, in sanitation. That is, one problem is the dust occurring when erasing the board in use or after use of the chalk, and the other is the uncomfortable sound occurring when the chalk scrapes the board. Further, there is uncomfortable touch for a tip of a finger when holding the chalk. On the other hand, when using quick-drying ink, there is a problem that the quick-drying ink cannot be easily erased after use, as well as the above problems of the chalk.
Further, another problem is that it is very hard to see the surface of the board due to reflection of the light from the board depending on the angle in observation of the black board or the white board.
Still further, there is a drawing toy which is formed by mixing iron sand into milk white fluid, enclosing the fluid into a small resin capsule, and arranging a plurality of resin capsules so as to constitute the board. In this structure, when drawing characters or pictures on the board, the iron sand is brought up to the surface of the board by using a magnetic bar. When erasing them, the iron sand is removed from the surface of the board by using another magnetic bar.
There is a problem, however, in this drawing toy. That is, it is very hard to partially erase characters or pictures from the board although it is possible to easily draw them on the board. As a result, this is inconvenient in actual use since the whole of the surface of the board is erased at once. Further, there is a problem that it is hard to observe the surface of the board depending on the observation angle since the light is reflected from the surface of the capsules.
Still further, recently, there is a display apparatus which arranges a plurality of photodiodes or liquid crystal elements on a flat board and controls the voltage supplied to them. Various types of this display apparatus have been developed and applied to various products. However, there are problems in this type of display apparatus. That is, although it is possible to realize high quality image in this type of the display apparatus, this display apparatus is very expensive, and the contents to be displayed must be previously input through a predetermined input device. As a result, this type of the display apparatus has no flexibility and convenience in actual use.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a new light-drawing type display apparatus which can solve the above-mentioned problems which occur in actual use of the black board, the white board, etc. The light-drawing type display apparatus according to the present invention has various advantages such as, for example, being very convenient in actual use, having a simplified structure and being low in cost, etc. That is, according to the present invention, it is possible to clearly solve the conventional problems which are caused by dust and the uncomfortable sound or touch in actual use of the chalk, and which are caused by the smell of the quick-drying ink. Further, according to the present invention, it is possible to easily erase, after use, and to avoid light reflection from the board depending on the observation angle.
According to the light-drawing type display apparatus of the present invention, there are provided a plate in the front side of the apparatus (i.e., the side in which a user observes the board) having a plurality of light-transmitting small holes (e.g., a plurality of penetrated small holes) and standing upright; a plurality of light-cutting members each of which is provided to each of small holes on the plate in order to open or close each of small holes; and a light source provided to the rear side of the plurality of light-cutting members for irradiating the whole of the plate;
wherein the plurality of light-cutting members are moved by using a predetermined writing means so that the plurality of light-transmitting small holes are opened, and the light from the light source is transmitted to the front side, then, characters or pictures are drawn on the plate; and
wherein the plurality of light-cutting members are moved by using a predetermined erasing means so that the plurality of light-transmitting small holes are closed, and the light from the light source is cut off, then, characters or pictures are erased from the plate.
In an embodiment, a plurality of plate-like light-cutting members are provided to the rear side of the plate, each of the plate-like light-cutting members has a sufficient size for closing each small hole and is mounted to the rear side of each small hole so as to be freely rotated by using a supporting shaft, and a magnet is mounted to each plate-like light-cutting member; a magnetic member is mounted to an upper portion of each small hole in the rear side of the plate so as to make an attraction force provided between the magnetic member and the magnet mounted to each plate-like light-cutting member;
the magnet is used as a predetermined writing means, the direction of the magnetic force of the magnet is directed to the direction for making a reaction force provided to the magnetic member, and each of the plurality of plate-like light-cutting members is moved to a position where the light from the light source is transmitted, by bringing the magnet near to the plate; and
the magnet is used as a predetermined erasing means, the direction of the magnetic force of the magnet is directed to the direction for making the attraction force provided to the magnetic member, and each of the plurality of plate-like light-cutting members is moved to a position where the light from the light source is cut off, by bringing the magnet near to the plate.
In another embodiment, each of the light-cutting members is formed of a spherical magnetic light-cutting member;
a light-transmitting holder which is inclined to a predetermined angle is mounted to each small hole through the magnet provided to the rear side of the plate; and the spherical magnetic light-cutting member is arranged so as to move within the holder; wherein when an external force from a writing brush used as the writing means and gravity act on the spherical magnetic light-cutting member, the spherical magnetic light-cutting member is moved within the holder so as to transmit the light from the light source; and wherein when the magnet used as the erasing means is brought near to the magnetic light-cutting member, the spherical magnetic light-cutting member is moved to the rear of the plate so that the light from the light source is cut off.
In still another embodiment, each of the light-cutting members is formed of a spherical magnetic light-cutting member which can move within a light-transmitting holder which is inclined to a predetermined angle and mounted to each small hole in the rear side of the plate;
wherein when blowing force from a blowing tool used as the writing means and gravity act on the spheri
Ackun Jacob K.
Christie Parker & Hale LLP
Fernstrom Kit
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