JPH06273713A - Image projecting device and image forming device for projecting image - Google Patents

Abstract

PURPOSE:To provide an image projecting device and an image forming device for projecting an image for which a special original need not be previously formed, whose constitution is miniaturized and is inexpensive, and whose operation is easy. CONSTITUTION:The original 4 is placed on a contact glass 3, and scanned by an image-formation scanner 6 in a state where voltage is impressed on transference electrodes 5a and 5b formed on the upper and the lower surfaces of a high-molecular liquid crystal composite film 5 by a power source 2. By scanning the composite film 5 with the reflected light from the original 4, the image in accordance with the variable density of an original image is transferred as an unmagnified image being the difference of the transmittance of the light in the composite film 5. When the original 4 is removed from the contact glass 3 and a lamp in an illuminating unit 9 is turned on, the image formed in the composite film 5 is enlarged and projected on a screen by a Fresnel lens, and the reflection mirror and the lens of a projecting unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection apparatus for optically projecting an original image on a screen and an image forming apparatus for image projection, and more particularly to a plain paper projector (PPP:
Plain PaperProjector).

[0002]

2. Description of the Related Art A general pure optical OHP (Over Head
Projector) and slide projectors use transparent sheets such as OHP sheets and slide films as originals, as disclosed in, for example, Japanese Patent Laid-Open No. 4-128734, and a transparent sheet is produced by projecting transmitted light from the transparent sheet. The image above is magnified and projected on the screen. However, since such a projection device cannot project an opaque plain paper original and cannot naturally project a thick book original,
It is inconvenient because it is necessary to handwrite on the transparent sheet or transfer the image by a copying machine.

Therefore, a semi-optical semi-electric device for projecting transmitted light of a TFT (thin film transistor) type liquid crystal display device which is electrically driven as disclosed in, for example, JP-A-4-149417 and JP-A-4-208932. Method is known, in which a document image is photoelectrically converted and electrically written in a liquid crystal device for visualization, and this image is optically magnified and projected. Further, in this apparatus, since the image to be projected is converted into an electric signal and stored in advance, the troublesome work of exchanging the document can be omitted.

[0004]

However, this T
In a projection device using an FT type liquid crystal display device, since the display device is electrically driven, a scanner for reading an original document and a digital image processing device are large and expensive, and the operation is complicated. There is. Furthermore, T
Since it is necessary to form a TFT for each pixel in the FT type liquid crystal display device, it is difficult to increase the size of the FT type liquid crystal display device due to the yield in manufacturing.

In view of the above-mentioned conventional problems, the present invention provides an image projection apparatus and an image projection apparatus for image projection which do not require a special original to be prepared in advance and which is small in size and inexpensive in operation. The purpose is to

[0006]

In order to achieve the above object, the image projection apparatus of the first means is provided with a photoresponsive film showing a change in state of transmitting or scattering incident light by light irradiation, and reflection of an original image. Image forming means for transferring an original image onto the photoresponsive film by forming light on the photoresponsive film, illuminating means for illuminating the photoresponsive film, and the illuminating means for illuminating the photoresponsive film. Projection means for enlarging and projecting the transmitted light of the photoresponsive film is provided.

In this case, the image forming means may be constructed so as to form an original image on the photoresponsive film after being magnified or reduced. Further, the photoresponsive film and the image forming means, the illuminating means and the projecting means are detachably configured, and in a separated state, the illuminating means illuminates the transparent sheet and the projecting means transmits the transmitted light of the transparent sheet. It can also be configured to magnify and project.

The image forming apparatus for image projection of the second means is
A photoresponsive film showing a state change in which incident light is transmitted or scattered by light irradiation, and a document image is transferred to the photoresponsive film by focusing the reflected light of the document image on the photoresponsive film. And image means.

In the image forming apparatus for image projection,
It is preferable that the photoresponsive film is horizontally arranged so that it can be mounted on the transparent sheet mounting surface of a pure optical image projector that magnifies and projects the transmitted light of the transparent sheet.

[0010]

In the first means, the reflected light of the original image is formed on the photoresponsive film by the image forming means, the original image is transferred onto the photoresponsive film, and the light on which the original image is transferred by the illuminating means is transferred. Illuminate the responsive film. The projection means magnifies and projects the light transmission light illuminated by the illumination means. In this way, an opaque plain paper original image is transferred optically onto the photoresponsive film without photoelectric conversion, and the transmitted light of the photoresponsive film is projected, so that a special transparent original is created in advance. There is no need to do so, and the reading of the original becomes easy.

Since the transmitted light of the transparent sheet can be enlarged and projected, it is possible to project not only plain paper but also a transparent OHP sheet with a small and inexpensive structure and a simple operation, and an opaque ordinary sheet. It is possible to reduce the size of the original image on paper without photo-electric conversion and transfer it onto the photo-responsive film. This allows the photo-sensitive film original image of a size smaller than the original to be transferred and reduced. The projected image can be enlarged and projected.

In the image forming apparatus for image projection of the second means, since the original image is optically transferred onto the photoresponsive film, a plain paper original can be attached by attaching it to a general pure optical image projector. Can be projected and therefore
Further, the cost can be reduced. By placing the photoresponsive film horizontally so that it can be placed on the transparent sheet placement surface of a general optical image projection device, it can be attached to or removed from a general optical image projection device. By doing so, not only plain paper but also transparent OHP
The sheet can be projected.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a document reading state of an embodiment of an image projecting apparatus according to the present invention, FIG. 2 is a block diagram showing a projecting state of the image projecting apparatus of FIG. 1, and FIG. FIG. 4 is an explanatory view showing the operation principle of the molecule / liquid crystal composite film, and FIG.
5 is an explanatory view showing the reading operation when the scanner unit of FIG. 1 is used alone, FIG. 5 is an explanatory view showing the reading after completion of the reading when the scanner unit of FIG. 1 is used alone, and FIG. It is explanatory drawing which shows the projection state of an OHP sheet.

In FIG. 1 and FIG. 2, this apparatus is constituted by, for example, an equal-magnification reading and transmission projection type, and a plain paper original 4 is roughly optically read to obtain a polymer as an example of a photoresponsive liquid crystal film. A scanner unit 1 for transferring to the liquid crystal composite film 5, an illumination unit 9 for illuminating an image transferred to the polymer / liquid crystal composite film 5, and a projection for projecting light transmitted through the polymer / liquid crystal composite film 5. The polymer / liquid crystal composite film 5 constituted by the unit 12 has a characteristic of changing the state of transmitting or scattering the incident light when irradiated with light.

The scanner unit 1 is detachably attached to the illumination unit 9 and is formed on the polymer / liquid crystal composite film 5 on which an image is formed by irradiation of light and on the upper and lower surfaces of the polymer / liquid crystal composite film 5. The power source 2 for applying a voltage to the transparent electrodes 5a, 5b, the transparent contact glass 3 for placing the original 4 downward, and the original 4 on the contact glass 3 are optically scanned to raise the height. An imaging scanner 6 for transferring to the molecule / liquid crystal composite film 5 is provided. The imaging scanner 6 forms a lamp 7 for illuminating the original 4 on the contact glass 3 in the main scanning direction (a direction orthogonal to the drawing) and an image of the reflected light of the original 4 on the polymer / liquid crystal composite film 5 at the same magnification. The lens 8 and the like are provided for moving the sub-scanning direction (the direction of the arrow in the figure). Therefore, the scanner unit 1 can be configured in the same manner as a general analog copying machine except for the polymer / liquid crystal composite film 5 and the power source 2.

The illumination unit 9 includes a polymer / liquid crystal composite film 5
Is provided with a lamp 11 for illuminating and radiating the transmitted light upward through the contact glass 3, and a Fresnel lens 10 is arranged so as to contact the lower surface of the polymer / liquid crystal composite film 5. . The projection unit 12 is composed of an even number of reflection mirrors 13 and 14 and a lens 15 for magnifying projection and is supported as one unit by a supporting means (not shown). Therefore, the illumination unit 9 and the projection unit 12 are generally pure optical. An optical system similar to the formula OHP can be used.

Next, the operating principle of the polymer / liquid crystal composite film 5 will be described with reference to FIG. First, the polymer / liquid crystal composite film 5 shows a state change in which a material formed by photopolymerization transmits or diffuses light depending on the presence or absence of an electric field. The composition of photopolymerization is, for example, a cyanobiphenyl liquid crystal and a bifunctional urethane. An acrylate oligomer (molecular weight: 2000) and a monomer (2-hydroxyethyl acrylate) are known.

The polymer / liquid crystal composite film 5 having such a configuration is set in advance so that the refractive index of the matrix and the ordinary refractive index of the liquid crystal match, and light is applied while applying an electric field as shown in FIG. 3 (a). When irradiated with, the liquid crystal is phase-separated in the irradiation part and polymerization proceeds, and the entire phase becomes transparent. Further, since the light distribution is fixed, this transparent state is maintained even when the electric field is not applied.

If the composition is simply photopolymerized,
Similarly, the liquid crystal phase gradually separates from the matrix, but since the orientation of the liquid crystal phase is random, a spatial difference in refractive index occurs, and light is scattered and opaque as shown in FIG. 3B. It becomes a state. Further, when a voltage is applied to the film 5, the liquid crystal is aligned in the direction of the electric field, the refractive indexes of the liquid crystal part and the matrix part match each other, and a transparent state is obtained as shown in FIG. 3C. Therefore, although the light transmittance changes greatly depending on whether the electric field is turned on or off, the original image can be optically transferred without photoelectric conversion.

Next, the operation of the above embodiment will be described. First,
When the original 4 is optically read and transferred to the polymer / liquid crystal composite film 5, the original 4 is placed on the contact glass 3 as shown in FIG. A voltage is applied by the power source 2 to the transparent electrodes 5a and 5b formed on the upper and lower surfaces. In this state, the original document 4 is scanned by the image forming scanner 6 and the polymer / liquid crystal composite film 5 is scanned by the reflected light, so that an image corresponding to the light and shade of the original image is reflected in the polymer / liquid crystal composite film 5. The image is transferred in the same size as the difference in the transmittance of the image. In this state, when the power supply 2 is turned off and the applied voltage to the transparent electrodes formed on the upper and lower surfaces of the polymer / liquid crystal composite film 5 is turned off, the image formed in the polymer / liquid crystal composite film 5 is retained. To be done. The transferred image is a negative of the original image.

Next, as shown in FIG. 2, when the original 4 is removed from the contact glass 3 and the lamp 11 in the illumination unit 9 is turned on, the image forming scanner 6 causes the contact glass 3 and the polymer / liquid crystal composite. With the Fresnel lens 10 and the reflection mirrors 13 and 14 and the lens 15 of the projection unit 12 in a state of being retracted from between the films 5,
The image formed in the liquid crystal composite film 5 is enlarged and projected as a positive image on a screen (not shown).

Therefore, according to the above embodiment, the original 4
Image is optically transferred to the polymer / liquid crystal composite film 5, and the image optically transferred to the polymer / liquid crystal composite film 5 is enlarged and projected. Therefore, a projection device using a TFT type liquid crystal display device can be used. As described above, the plain paper document 4 can be projected without using a scanner or a digital image processing circuit for photoelectrically converting the image of the document 4.

Since the scanner unit 1 is detachably attached to the illumination unit 9, the scanner unit 1 is attached to the illumination unit 9 as shown in FIGS. 4 and 5.
The original can be read at a different place separately from the above, and can also be attached to the existing pure optical OHP. Furthermore, since the illumination unit 9 and the projection unit 12 can be used as a pure optical OHP, the OHP sheet 16 can also be projected with the scanner unit 1 removed as shown in FIG. It can be used as a convenient OHP that is not available in Japan.

Although the polymer / liquid crystal composite film 5 is used as an example of the photoresponsive liquid crystal film in the above embodiment, a ferroelectric liquid crystal (FLC: Ferroelectric Liquid Cryst) is used instead.
It is possible to use a liquid crystal in which, for example, an azobenzene derivative that reacts with light is mixed with al). This LCD is "NATU
RE VOL 361 4 FEBRUARY 1993 ”, a liquid crystal in which an azobenzene derivative is mixed with FLC is used as a transparent conductive film.
ITO (indium oxide) arranged with a gap of μm
Enclosed between the membranes.

The operation principle of this liquid crystal will be described with reference to FIG. 7. First, as shown in FIG.
First, a voltage of several V is applied between a and 21b, and then FIG.
When the polarity of the applied voltage is reversed and the image is projected (or laser light is irradiated) as shown in FIG.
As shown in (c), the liquid crystal 2 between the ITO films 21a and 21b.
The two phases change according to the irradiation light, and therefore the liquid crystal 22
An image is formed on. Further, in this state, unless the polarity of the applied voltage is reversed, the image formed on the liquid crystal 22 is held.

Next, a second embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a configuration diagram showing the original reading state of the second embodiment, and FIG. 9 is a configuration diagram showing the projection state of the image projection apparatus of FIG. 8. In the first embodiment, the image projection apparatus is of the transmissive projection type. However, in the second embodiment, the reflection projection type is used.

The scanner unit 1a of this embodiment is roughly composed of the scanner unit 1 of the first embodiment and a Fresnel lens mirror 17 which constitutes a part of an illumination projection optical system. The polymer / liquid crystal composite film 5 showing a change in the state of transmitting or scattering incident light by the transparent electrode 5 and the transparent electrode 5 formed on the upper and lower surfaces of the polymer / liquid crystal composite film 5.
a, a power source 2 for applying a voltage to 5b, a transparent contact glass 3 for placing the original 4 downward, and an original 4 on the contact glass 3 is optically scanned for polymer / liquid crystal composite. It has an imaging scanner 6 for transferring to the film 5 and a Fresnel lens mirror 17 arranged so as to contact the lower surface of the polymer / liquid crystal composite film 5.

The illumination projection unit 19 includes a lamp 18 for illuminating the upper surface of the polymer / liquid crystal composite film 5 from above via the contact glass 3 and a Fresnel lens mirror 17 for condensing light through the polymer / liquid crystal composite film 5. It is composed of an even number of mirrors 13 and 14 that reflect the reflected light and a lens 15 for magnifying projection, and is supported by a Fresnel lens mirror 17 on the scanner unit 1a side.

Therefore, in the original reading operation in this case, the original 4 is placed on the contact glass 3 and the polymer / liquid crystal composite film 5 is placed on the contact glass 3 as shown in FIG. A voltage is applied by the power source 2 to the transparent electrodes 5a and 5b formed on the lower surface. In this state, the original document 4 is scanned by the image forming scanner 6 and the polymer / liquid crystal composite film 5 is scanned by the reflected light, so that an image corresponding to the light and shade of the original image is reflected in the polymer / liquid crystal composite film 5. The image is transferred in the same size as the difference in the transmittance of the image. Further, in this state, when the power supply 2 is turned off and the applied voltage to the transparent electrodes 5a and 5b formed on the upper and lower surfaces of the polymer / liquid crystal composite film 5 is turned off, the polymer / liquid crystal composite film 5 is formed. The created image is retained.

Next, as shown in FIG. 9, when the original 4 is removed from the contact glass 3 and the lamp 11 of the illumination projection unit 19 is turned on, the imaging scanner 6 causes the contact glass 3 and the polymer / liquid crystal composite. The image formed in the polymer / liquid crystal composite film 5 by the Fresnel lens mirror 17, the reflection mirrors 13 and 14 and the lens 15 in a state of being retracted from between the films 5 is enlarged as a positive image on a screen (not shown). Projected.

Next, referring to FIG. 10 and FIG.
An example will be described. FIG. 10 is a configuration diagram showing a document reading state of the third embodiment, and FIG. 11 is a configuration diagram showing a projection state of the image projection apparatus of FIG. 10. In the first and second embodiments, the image is of the same-magnification reading type. However, in the third embodiment, the reduction reading type is used.

The polymer / liquid crystal composite film 22 of the scanner unit 1b has one end so that the polymer / liquid crystal composite film 22 can be selectively arranged in the optical path at the time of reading an original as shown in FIG. 10 and the optical path at the time of projection as shown in FIG. Is rotatably supported about the rotary shaft. Note that this driving may be performed electrically or manually.

The scanner unit 1b also has a lamp 27 for collectively illuminating the original 4 on the contact glass 3 as a reading optical system, and a reflected light of the original 4 for reducing and forming an image on the polymer / liquid crystal composite film 22. A reflecting mirror 20 and a lens 21 for guiding the reflected light of the original 4 illuminated by the lamp 27 to the polymer / liquid crystal composite film 22 are fixed to the projection mirror to illuminate the polymer / liquid crystal composite film 22 as a projection optical system. The lamp 24, the lens 23, and the polymer / liquid crystal composite film 2
A lens 25 and a mirror 26 for enlarging and projecting the transmitted light of No. 2 on a screen (not shown) are fixed.

The lens 25 and the mirror 26 of the projection optical system are fixed to the scanner unit 1b via a supporting member (not shown), and the polymer / liquid crystal composite film 22 is a positive image of the original image by the reflecting mirror 20. Was written,
Since the transmitted light of the polymer / liquid crystal composite film 22 is projected, the number of mirrors 26 is an odd number.

Therefore, according to this embodiment, since the original image is reduced and written on the polymer / liquid crystal composite film 22, the polymer / liquid crystal composite film 22 can be downsized,
Therefore, the cost can be reduced compared to the first and second embodiments.

[0036]

As is apparent from the above description, since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, since the opaque plain paper original image is transferred onto the photoresponsive film purely optically without photoelectric conversion, it is necessary to prepare a special transparent original in advance. Further, since the image is eliminated and projection can be performed using the transferred photoresponsive film, it is possible to provide an image projection apparatus which is small in size, inexpensive, and easy to operate.

According to the second aspect of the invention, since the image forming means forms an original image on the photoresponsive film at the same size, it is not necessary to prepare a special original in advance.

According to the third aspect of the present invention, the photoresponsive film, the image forming means, the illuminating means and the projecting means are detachable, and the illuminating means illuminates the transparent sheet in a separated state. Since the projection means is capable of magnifying and projecting the transmitted light of the transparent sheet, it is possible to use not only plain paper but also transparent O with a small and inexpensive structure and simple operation.
The HP sheet can be projected.

According to the invention described in claim 4, since the image forming means reduces the image of the original to form an image on the photoresponsive film, the image can be projected by the photoresponsive film smaller than the original. Therefore, it is possible to provide an image projection apparatus which does not require a special original to be prepared in advance and which has a small size and is inexpensive.

According to the fifth aspect of the present invention, since the plain paper original can be projected by being attached to a general pure optical image projection device, the structure can be constructed at a lower cost.

According to the sixth aspect of the invention, the photoresponsive film is horizontally arranged so that it can be mounted on the transparent sheet mounting surface of the pure optical image projection device for magnifying and projecting the transmitted light of the transparent sheet. Therefore, it is possible to project not only plain paper but also transparent OHP sheet by a simple operation by attaching or detaching to a general pure optical image projector.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a document reading state of an image projection apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a projection state of the image projection apparatus of FIG.

FIG. 3 is an explanatory diagram showing the operating principle of the polymer / liquid crystal composite film of FIGS. 1 and 2.

FIG. 4 is an explanatory diagram showing a reading operation when the scanner unit of FIG. 1 is used alone.

5 is an explanatory diagram showing a state after reading is completed when the scanner unit of FIG. 1 is used alone.

FIG. 6 is an explanatory diagram showing a projection state of an OHP sheet of the image projection device of FIG.

FIG. 7 is an explanatory diagram showing the operating principle of another example of the photoresponsive liquid crystal film.

FIG. 8 is a configuration diagram showing a document reading state of the second embodiment.

9 is a configuration diagram showing a projection state of the image projecting apparatus of FIG.

FIG. 10 is a configuration diagram showing a document reading state of a third embodiment.

11 is a configuration diagram showing a projection state of the image projecting apparatus of FIG.

[Explanation of symbols]

 1, 1a, 1b Scanner unit 3 Contact glass 4 Original 5 Polymer / liquid crystal composite film 6 Imaging scanner 9 Illumination unit 12 Projection unit 16 OHP sheet 19 Illumination projection unit

Claims (6)

[Claims] 1. An image projection apparatus for enlarging and projecting a document placed on a document placing means, wherein a photoresponsive film showing a state change of transmitting or scattering incident light by light irradiation, and an image of the document. Image forming means for transferring an original image to the photoresponsive film by forming reflected light on the photoresponsive film, illuminating means for illuminating the photoresponsive film, and illumination by the illuminating means An image projection apparatus comprising: a projection unit that magnifies and projects the transmitted light of the photoresponsive film. 2. The image projection apparatus according to claim 1, wherein the image forming unit forms an original image on the photoresponsive film at an equal size. 3. The photoresponsive film and the image forming means, and the illuminating means and the projecting means are detachably configured, and the illuminating means illuminates a transparent sheet in a separated state to cause the projecting means to operate. The image projection apparatus according to claim 1 or 2, wherein the transmitted light of the transparent sheet is configured to be capable of being magnified and projected. 4. The image projection apparatus according to claim 1, wherein the image forming unit reduces the size of the original image and forms an image on the photoresponsive film. 5. A photoresponsive film showing a state change in which incident light is transmitted or scattered by light irradiation, and a reflected light of a document image is imaged on the photoresponsive film, whereby the document image is rendered photoresponsive. An image forming apparatus for image projection, comprising: an image forming means for transferring onto a film. 6. The photoresponsive film is horizontally arranged so that it can be mounted on a transparent sheet mounting surface of a pure optical image projection device that magnifies and projects transmitted light of the transparent sheet. The image forming apparatus for image projection according to claim 5.