JPH0417403B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a projection device that allows additions and corrections to an image that is being projected onto a video screen in front of it by another image enlarging device. .

[Background of the invention]

Slides and OHP (Over
A projector called a head projector or a real projector is used. These principles involve projecting light onto a film displaying the contents of the material or the material itself, magnifying the transmitted or reflected light with a lens, and projecting it onto a video screen.

OHP has various advantages in use compared to slides, but like slides, it uses film, and creating the film software is extremely complicated, time-consuming, and expensive. There was a problem.

On the other hand, a real projector projects the real thing as it is, so there is no need to create software, and it is extremely advantageous in terms of quick response, speed, and cost.

However, in this physical projector, the surface of the material being projected is oriented toward the inside of the device and cannot be seen from the outside, so there is a drawback that writing cannot be done on the material itself.

In this case, although it is possible to point to the image on the video screen with a pointer using a stick, spotlight, or laser, the point cannot be left on the video.

[Purpose of the invention]

An object of the present invention is to enable additions, corrections, and corrections to be made very easily at desired positions on any type of image projected on the video screen in front of the user.

[Structure of the invention]

To this end, the present invention provides a projector main body that projects an image projected on a front video screen onto a document set surface in the same manner on the left, right, top, and bottom, and has a light source below the document set surface, and a projector body that is transparent. A document screen is provided in which an opaque substance that can be held in an irregular shape and can be held in any shape is sealed between two flexible sheets, and both sheets are placed on the document screen placed on the document set surface of the projector main body. It is now possible to project symbols, etc. written in such a way that the gaps are transparent on the video screen.

〔Example〕

Examples of the present invention will be described below. First, FIG. 1 is a diagram showing an embodiment of the original screen, and this original screen A is made of flexible, translucent sheets 1 and 2 whose periphery is closed to form an outer cover.
and an opaque substance 3 sealed inside both sheets 1 and 2. The opaque material 3 is made of a material made by kneading metal powder such as stainless steel powder with a highly viscous paste material such as silicone oil, and its surface is glossy with a semi-gloss silver to white color or a color close to it. It is in an extinguished state. Note that the upper sheet 1 of the sheets 1 and 2 can be made smooth by coating the surface with a fluorine resin.

Therefore, it is possible to project an image projected from the outside onto the upper surface of the original screen A. In other words, it can function as a small video screen. Note that a sheet with a matte surface may also be used for the sheet 1 or 2 on the side that functions as the video screen surface. In this case as well, the effect of image appearance is the same.

In addition, when this manuscript screen A is placed on a relatively solid surface and a line or character is drawn on it with a pointed pen-like stick, the inside of the pressed part becomes opaque. The substance 3 escapes to the surrounding area, and the sheets 1 and 2 above and below that part are bonded together, and the space between them becomes translucent. This state is maintained for a long time because the opaque material has a high viscosity. In other words, this original screen A also functions as a translucent original sheet. Note that if the sheet 1 on the upper surface of the original screen A is coated with fluorine as described above, even if writing is done with a magic pen, ballpoint pen, etc., it will be easy to erase it.

Next, FIG. 2a, FIG. 2b, and FIG. 2c are views showing an embodiment of the projector main body. This projector body B
is a light source storage box 4 similar to that in a normal OHP,
A Fresnel lens (not shown) is set on the top surface of the box 4, a mirror 5 changes the optical path of the image of the original placed on the Fresnel lens by 90 degrees and directs it in the direction C; A lens 6 for forming an optical image of the image on a screen (not shown) installed at the front D, and a V mirror 7 for reversing the optical path of the image light from the lens 6 toward the rear C by 180 degrees and directing it toward the front D. It is equipped with.

Numeral 8 is a column that stands up from the front D side of the box 4, and a rack 9 is provided on one of its upper surfaces. A guide 10 is guided to this pillar 8, and a pinion 1 that meshes with the rack 9 is connected to this guide 10.
1 is provided. 12 is a knob for rotating the pinion 11. Reference numeral 13 denotes a support plate fixed to the guide 10, and the above-mentioned lens 6 and mirrors 5, 7 are attached to this support plate 12. However, the V mirror 7 is fixed by one screw 15 via a block 14, and by loosening the screw 15, the elevation angle relative to the front D can be adjusted. The other mirror 5 is fixed. 16 is a light shielding plate that covers the front D side of the upper surface of the box 4.

On the top surface of this box 4, as shown in FIG. 3, a wiper E is provided for smoothing the surface of the document screen A described above. This wiper E includes a frame 17 and roller mechanisms 1 mounted on both ends of the frame 17.
Each of the roller mechanisms 18 is composed of a pair of rollers 18a and 18b arranged vertically in parallel with a slight gap between them. It is designed to be rotated in the opposite direction. Note that the gap between the rollers 18a and 18b is adjusted to be approximately equal to the thickness of the document screen A described above. A handle 19 is attached to the roller 18b to rotate the roller mechanism 18. Reference numeral 20 denotes a document receiving plate disposed between the two roller mechanisms 18, and is made of a light-transmitting plate material, for example, a transparent resin plate.

Now, in order to point and write on the image on the video screen in the forward direction D using the original screen A, first place the original screen A in the gap between the rollers 18a and 18b as shown in FIG. It is sandwiched and mounted so as to span between both roller mechanisms 18, and mounted on the receiving plate 20. This operation is performed while turning the handle 19.

Next, adjust the vertical positions of the lens 6 and mirrors 5 and 7, the elevation angle of the V-mirror 7, etc. using the knob 12 of the pinion 11, and use the OHP, slide, video, real projector, etc. installed elsewhere to The image being projected on the video screen is projected onto the upper surface of the original screen A. At this time, the image projected onto the A side of the original screen remains exactly as it is on the top, bottom, right and left of the image on the video screen. In other words, when an operator stands on the rear C side of the projector body B, the operator can confirm the image projected on the front image screen D on the original screen A side.

At this time, direct light from the front video screen D to the original screen A is blocked by the light shielding plate 16, and the original screen A is illuminated with sufficient contrast.
You can see the image projected on.

Therefore, when a predetermined character, symbol, etc. is written at a point or a desired location on the image copied on the upper surface of the original screen A with a pen-like pointed stick, the writing section As shown in the figure, a concave portion 30 is formed, and the non-transparent material 3 in that portion becomes a concave portion 30.
0 and is pushed to the circumference of the recess 30.
is transparent between both surfaces of sheets 1 and 2.

Therefore, light from the light source inside the box 4 passes through the recess 30 and is projected onto the video screen in front D. That is, the recess 30 written on the surface of the original screen A
The shapes of characters, figures, etc., are projected in the same manner vertically and horizontally, superimposed on the same target position of the image on the video screen, and a clear point or writing is made on the image on the screen.

On the other hand, since the opaque material 3 sealed therein has a high viscosity, the original screen A has the above-mentioned concave portion 3.
0 remains in that state unless an external force is applied. Therefore, in order to return the recess 30 to its original state, that is, to erase the writing, use the handle 19 to remove the rollers 18a and 1.
8b to move the recess 30 into the rollers 18a, 18.
Just pass it through the gap b. In this case, reciprocating motion is performed as necessary.

Note that when no other image is projected on the video screen in the forward direction D, the content written on the original screen A will be projected on that video screen, and in this case, it can be used as a substitute blackboard.

Further, the present invention can be applied to any other image projected on the video screen or to any image written on ordinary paper or the like.

Furthermore, if one or both of the sheets 1 and 2 is colored with a specific color, colored points and writing can be made. In this case, if you divide the sheets 1 and 2 in the longitudinal direction appropriately and color each section with a different color, you can point and write in a color different from the image projected on the video screen, making it clear. Sexuality is promoted.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to very easily point or write on any image projected on a video screen and erase it at a desired position, and it can also be used as a substitute blackboard. have sex.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a document screen according to an embodiment of the present invention, FIG. 2a is a front view of the projector main body of the same embodiment, FIG. 2b is a side view, FIG. 2c is a plan view, and FIG.
The figure is an explanatory diagram of the state in which the original screen is loaded into the projector main body, and FIG. 4 is a sectional view for explaining the state of writing on the original screen. A...Original screen, B...Projector body, C
...Backward, D...Front, E...Wiper, 1, 2...
... Sheet, 3... Opaque material, 4... Light source box,
5...mirror, 6...lens, 7...V mirror,
8... Pillar, 9... Rack, 10... Guide, 11
...Pinion, 12...Knob, 13...Support plate, 14...Block, 15...Screw, 16...
Light shielding plate, 17... Frame, 18... Roller mechanism, 19
...handle, 20...receiving plate, 30...recess.

Claims (1)

[Scope of Claims] 1. A projector main body that projects the image projected on the front video screen onto the document set surface in the same manner horizontally, top and bottom, and has a light source below the document set surface, and a light-transmitting projector body. A document screen is provided in which an opaque substance that can be held in an irregular shape and can be held in any shape is sealed between two flexible sheets, and both sheets are placed on the document screen placed on the document set surface of the projector main body. A recording and projecting device characterized in that it is possible to project symbols, etc. written on the video screen so that the gaps are transparent.