JPH0678949U - Projector - Google Patents

Abstract

(57) [Summary] [Purpose] To project an image of an opaque material on the screen as a bright and clear image. [Structure] The material 3 placed on the light-transmitting type material table is pressed from above by the material pressing plate 4, and the material 3 is illuminated by the main light source 7 arranged on the lower side of the material table. A projector for projecting an image onto a screen through a projection lens, wherein the transmission table has a flat upper surface and a convex lens surface on the lower surface, and a transmission type Fresnel lens 11 is used as the material table.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a projector.

[0002]

[Prior art]

 FIG. 10 is a partial vertical sectional view of a conventional projector.

In the figure, 1 is a main body case, 2 is a light-transmissive material table horizontally attached to an upper opening of the main body case 3, and 3 is a projection sheet-like material placed on the material table 2. It is a document. Reference numeral 4 is a material holding plate that holds the material 3 from above and fixes it on the flat glass material table 2, and the side in contact with the material 3 is white. The holding plate 4 is attached to a bearing 5 provided on the main body case so as to be movable up and down via a pin 6 so as to be openable and closable in the arrow direction.

Reference numeral 7 is a main light source installed in the main body case 1, and 8 is a reflecting mirror. The reflecting mirror 8 reflects the light from the main light source 7 in the direction of the material table 2 and reflects the light reflected by the material 3 or the material holding plate 4 in the direction of the projection lens 9. The projection lens 9 projects the light reflected by the reflecting mirror 8 onto a screen (not shown).

With such a configuration, as shown in FIG. 10, when the material 3 is placed on the material table 2 and held by the material holding plate 4 and the main light source 7 is attached, the characters of the material 3 are displayed. , Images such as figures can be projected on the screen.

[0006]

[Problems to be solved by the device]

 (1) However, since the conventional projector has a structure in which the material 3 is directly pressed by the material pressing plate 4 as described above, the light from the main light source 7 that illuminates the material 3 is opaque to the material 3. In the case of, the material 3 is reflected by the opaque material 3, and in the case of being transparent, it is reflected by the material pressing plate 4, and the image of each material is enlarged and projected on the screen through the projection lens 9. At this time, the light reflected by the material 3 or the material holding plate 4 becomes scattered light regardless of whether the material is transparent or opaque.

Therefore, the conventional projector has a problem that the image of the material projected on the screen becomes dark and the projector cannot be used in a dark room.

The transparent material referred to in this specification means that the base material is, for example, a transparent sheet such as a film, on which images such as characters and figures are recorded. In addition, an opaque material means that the base material is an opaque sheet such as paper on which an image such as characters and figures is recorded.

The present invention has been made to solve the above-mentioned conventional problems, and by attaching a reflection-type condensing Fresnel lens to the material holding plate, if the material is transparent, it is bright. An object of the present invention is to provide a projector (hereinafter, referred to as a first projector) capable of projecting an image as a bright and clear image even in a room.

(2) In the first projector, if the material is transparent, the image of the material can be projected on the screen as a bright image, but the opaque material is placed on the material table and the material is pressed. When held down by a plate and illuminated, the light is reflected by the material and becomes scattered light, so the image of the material is still projected as a dark image on the screen in the same manner as in a conventional projector, and it is projected in a dark room. Otherwise it will be difficult to see.

The present invention has been made to solve the above problems, and an object thereof is to provide the following second to sixth projectors.

A second projector that allows the image of an opaque material to be projected as a bright and clear image by making the optical axis of the main light source variable.

By using a transmissive Fresnel lens having a convex lens surface as a material table, even an opaque material can project its image as a bright and clear image. Projector.

By installing a light shielding plate or a light scattering plate on the optical axis of the main light source so as to be able to move forward and backward, even an opaque material can be projected as a bright and clear image. Fourth projector.

By using a transmissive Fresnel lens as a data base and installing a light blocking plate or a light scattering plate on the optical axis of the main light source so as to be able to move forward and backward, the image of an opaque material can be displayed. The fifth projector that is capable of projecting bright and clear images.

A projector in which an auxiliary light source is installed in addition to the main light source so that an image of an opaque material can be projected as a bright and clear image.

(3) In the first to fifth projectors, not only transparent materials but also opaque materials can project their images as bright images on the screen, but there is only one. When the light source is cut off, neither transparent nor opaque material can be projected.

The present invention has been made to solve the above problems, and uses two main light sources whose optical axes can be changed, and uses a reflecting mirror which changes the optical axis of each main light source. Therefore, even if one main light source is cut off, it is necessary to provide a projector (hereinafter referred to as a seventh projector or an eighth projector) capable of projecting a transparent or opaque material image as a bright image. With the goal.

[0019]

[Means for Solving the Problems]

 (1) The first projector provided by this invention is a main projector in which a material placed on a light-transmitting type material table is pressed from above by a material pressing plate, and the material is placed below the material table. It is a projector that illuminates with a light source and projects the image of the same material on a screen through a projection lens, and a reflective condensing Fresnel lens that is in direct contact with the material when it is pressed is attached to the material holding plate. It is a thing. The reflective condensing Fresnel lens includes a transmissive Fresnel lens having a plane reflecting mirror integrally provided on the lens surface side. (2) The second projector provided by the present invention is capable of rotating or moving the main light source in the first projector so that its optical axis can be changed between the direction of the reflecting mirror and the direction of the table. It was done.

(3) The third projector provided by the present invention uses a transmission type Fresnel lens whose upper surface is a flat surface and whose lower surface is a convex lens surface, as a data base in the first projector. It is a thing.

(4) A fourth projector provided by the present invention has a light-shielding plate or a light-scattering plate installed near the main light source in the first projector and on the optical axis of the light source. is there.

(5) A fifth projector provided by the present invention uses a transmission type Fresnel lens whose upper surface is a flat surface and whose lower surface is a convex lens surface as a data base in the first projector. A light shielding plate or a light scattering plate is installed near the light source and on the optical axis of the light source.

(6) The sixth projector provided by the present invention is provided with at least one sub light source for directly illuminating the material in the vicinity of the main light source in the first to fifth projectors.

(7) A seventh projector provided by the present invention uses a first main light source and a second main light source arranged side by side as main light sources in the first, third to fifth projectors, A first reflecting mirror and a second reflecting mirror are used as reflecting mirrors, and the optical axes of the first main light source and the second main light source can be respectively changed to the first reflecting mirror direction and the data platform direction. In addition, the first reflecting mirror is rotatably and movable, and the first reflecting mirror has a position where the optical axis of the first main light source is directed to the second reflecting mirror and a position where the optical axis of the second main light source is directed to the second reflecting mirror. Positioning is possible.

(8) The eighth projector provided by the present invention is such that the optical axes of the respective light sources are respectively provided between the first main light source and the second main light source in the seventh projector and the data base. It has a third reflecting mirror facing the table.

[0026]

[Action]

 (1) In the first projector, if a transparent material is installed on the material table and held by the material holding plate from above and illuminated from below, the light is collected by the converging Fresnel lens, And because it is reflected, the image of the material is enlarged and projected on the screen as a bright and clear image, which can be seen even in a bright room.

(2) Since the flat glass table in the first projector has two light-reflecting surfaces on the upper and lower sides on the optical axis, when the reflected light enters the projection lens, it is magnified. Form a strong light spot in the center of the screen. In the case of an opaque material, this reflected light is projected on the screen while overlapping with the effective reflected light from the surface of the opaque material, so that the image of the spot of light is faint and difficult to see.

However, in the second projector, when an opaque material is projected, the optical axis of the main light source can be changed to irradiate the light directly to the material, so that the surface generated on the optical axis You can avoid reflections. As a result, only the scattered light is screened through the projection lens and the image on the screen is uniformly bright and clear. Needless to say, if the main light source is set as shown in FIG. 1, a transparent image of the material can be projected brightly as in the first projector. The same applies to the following third to fifth projectors.

(3) In the third projector, since a transmission type Fresnel lens whose lower surface is a convex lens surface is used for the data base, the light reflecting surface on the optical axis of the lens is the upper surface side. This is only a plane, and the amount of light reflected by the Fresnel lens is about half that of the first projector. Further, the pattern of the reflected light in the peripheral portion of the Fresnel lens is also inside the lens, so that the light amount in the peripheral portion of the lens also increases by about 17%. As a result, the above-mentioned light spot image becomes less faint and less visible, and the peripheral part of the Fresnel lens also becomes brighter, so when an opaque material is projected, the image on the screen is uniformly bright and clear. It will be

(4) In the first projector, the above-mentioned strong light spot is formed at the center of the screen. When projecting an opaque material, this spot of light thins the image in that part and darkens the periphery of the image, and is not necessary in the original sense.

However, in the fourth projector, the light on the optical axis portion of the main light source that produces a spot of light is blocked or scattered by the light blocking plate or the light scattering plate, so that the light reflected by the flat glass table is used. Can be eliminated. That is, the amount of reflected light generated on the optical axis can be made almost zero. As a result, there is no possibility that the image of the light spot portion becomes faint and difficult to see. Therefore, when an opaque material is projected, the image on the screen becomes uniformly bright and clear.

(5) Since the fifth projector is configured by combining the above-described third and fourth projectors, it has a synergistic action of both projectors.

(6) In the sixth projector, a sub light source is provided in addition to the main light source in the first to fifth projectors. Therefore, all of them are turned on to illuminate an opaque document. The amount of light emitted can be increased. As a result, the image on the screen can be made uniformly bright and clear. By turning off the sub light source and setting the main light source as in the first projector, an image of a transparent material can be projected brightly.

(7) In the seventh projector, two main light sources are used as the main light sources in the first, third, and fifth projectors, and the first reflecting mirror and the second reflecting mirror are used as reflecting mirrors. By using a mirror and changing the position of the first reflecting mirror, the optical axes of the first main light source and the second main light source can be individually directed to the second reflecting mirror. When one of the main light sources is cut off, the transparent material image can be projected on the screen by changing the position of the first reflecting mirror and using the other main light source.

Since both the light sources are rotatable or movable so that the optical axes of the first main light source and the second main light source can be changed, when projecting an opaque material, the light from both light sources can be changed. It is possible to direct the light to the material by directing the axis toward the material table. As a result, the image on the screen will be uniformly bright and clear.

(8) In the eighth projector, when an opaque material is projected, the material can be illuminated through the third reflecting mirror by the first main light source and the second main light source, so that the scattering is performed. Only the light is projected onto the screen through the projection lens, and the image on the screen becomes uniformly bright and clear.

[0037]

【Example】

 Example 1 FIG. 1 is a configuration diagram of an example (hereinafter referred to as Example 1) of a first projector.

In the figure, 1-9 show the same components as in the conventional projector shown in FIG. Therefore, its explanation is omitted. Reference numeral 10 is a reflective condensing Fresnel lens attached to the lower surface of the material holding plate 4. The lower surface of the Fresnel lens 10, that is, the surface of the side that directly contacts the material 3 when the material 3 is pressed by the material pressing plate 4 on the material table 2 is a concave lens surface. Further, the upper surface of the Fresnel lens 10, that is, the surface on the side of the material holding plate is a reflecting mirror formed by sputtering aluminum.

Next, the operation will be described. When the material 3 held by the material holding plate 4 is transparent, the light of the main light source 7 reflected by the reflecting mirror 8 is collected and reflected by the condenser Fresnel lens 10, so that the characters of the material 3 are displayed. , Images such as figures are enlarged and projected on the screen as bright and clear images. Therefore, you can view the image in a bright room without making the room dark.

Example 2 FIG. 2 is a configuration diagram of an example (hereinafter, referred to as Example 2) of the second projector.

The projector according to the second embodiment has a structure in which the light source 7 in the first embodiment is rotatable so that the optical axis of the main light source 7 can be directly directed from the reflecting mirror 8 to the document 3. is there. Other configurations are the same as those in the first embodiment. In this case, the main light source 7 may be configured to move for a certain distance and then rotate, for example.

Since the flat glass table 2 in the projector of Example 1 has two light-reflecting surfaces on the optical axis, that is, upper and lower surfaces, when the reflected light enters the projection lens 9, it is magnified and scrolled. Creates a strong light spot in the center of the lean. This reflected light overlaps with the effective reflected light from the document surface and is projected on the screen, so there is a drawback that the image of the spot of light becomes faint and difficult to see.

However, according to the projector of the second embodiment, when an opaque material is projected, the optical axis of the main light source 7 can be changed and the light can be directly applied to the material 3, so that scattered light can be obtained. Only the projection is projected on the screen through the projection lens 9. As a result, the image on the screen is uniformly bright and clear.

Example 3 FIG. 3 is a configuration diagram of an example of a third projector (hereinafter, referred to as Example 3).

The projector of Example 3 has a structure using a transmission type Fresnel lens 11 whose upper surface is a flat surface and whose lower surface is a convex lens surface, instead of the data base 2 in the first embodiment. Other configurations are the same as those in the first embodiment.

In the projector of Example 3, the light-reflecting surface on the optical axis of the transmissive Fresnel lens 11 is only the plane on the upper surface side, and the amount of light reflected by the Fresnel lens 11 is about 1 / th of that in Example 1. It becomes 2. Further, since the pattern of the reflected light in the peripheral portion of the Fresnel lens 11 also comes inside the lens 11, the light amount in the peripheral portion of the lens also increases by about 17%. As a result, the image on the screen is uniformly bright and clear.

Fourth Embodiment FIG. 4 is a configuration diagram of an embodiment (hereinafter, referred to as a fourth embodiment) of a fourth projector.

The projector of the fourth embodiment has a structure in which a light shielding plate 12 is installed near the main light source 7 in the first embodiment and on the optical axis of the light source 7. A light scattering plate may be used instead of the light shielding plate 12. Other configurations are the same as those in the first embodiment.

In the projector of the first embodiment, as described above, a strong light spot is formed at the center of the screen. When projecting an opaque material, this spot of light makes the image of the part thin and darkens the periphery of the image, and thus is not originally necessary.

However, in the projector of the fourth embodiment, since the light on the optical axis portion of the main light source 7 that produces a light spot is blocked by the light shielding plate 12 (or is scattered by the light scattering plate), the flat glass is used. It is possible to eliminate the light reflected by the material table 2. That is, the amount of reflected light generated on the optical axis can be almost eliminated. As a result, when the opaque material 3 is projected as in the first embodiment, there is no possibility that the image of the light spot portion becomes faint and difficult to see. Therefore, when an opaque material is projected, the image on the screen becomes uniformly bright and clear.

Example 5 FIG. 5 is a configuration diagram of an example of a fifth projector (hereinafter, referred to as Example 5).

The projector of Example 5 uses a transmissive Fresnel lens 11 whose upper surface is a flat surface and whose lower surface is a convex lens surface, instead of the data base 2 in the first embodiment, and which is near the main light source 7. The light-shielding plate 12 (or a light-scattering plate) may be installed on the optical axis of the light source 7. Other configurations are the same as those in the first embodiment.

The projector of the fifth embodiment has a structure in which both the projectors of the third and fourth embodiments are combined, so that the projectors have a synergistic action.

Example 6 FIG. 6 is a configuration diagram of an example (hereinafter referred to as Example 6) of a sixth projector.

The projector of the sixth embodiment has a structure in which two sub light sources 13 are provided in the projector of the fifth embodiment. Other configurations are the same as those in the fifth embodiment.

In the sixth embodiment, in addition to the main light source 7, two sub-light sources 13 for directly illuminating the document 3 are provided. Therefore, by turning on all the light sources 7 and 13, an opaque original document is obtained. The amount of light to be applied can be increased. Therefore, the image on the screen can be uniformly bright and clear.

The configuration of the sixth embodiment can be similarly applied to the projectors of the first to fourth embodiments. In any of the embodiments, at least one sub light source 13 may be provided.

Example 7 FIGS. 7 and 8 are configuration diagrams of an example (hereinafter, referred to as Example 7) of a seventh projector.

In both figures, 7 a and 7 b are a first main light source and a second main light source which are arranged in parallel with the second reflecting mirror 8. The second reflecting mirror 8 corresponds to the reflecting mirror 8 of the seventh embodiment, and corresponds to the main light source 7 of the first embodiment of each of the main light sources 7a 1 and 7b 2. Both main light sources 7a and 7b are rotatably installed so that their optical axes are directed toward a first reflecting mirror 14 and a data base 2 which will be described later. Reference numeral 14 is a first reflecting mirror installed between the first main light source 7a and the second main light source 7b. The first reflecting mirror 14 is positioned at a position where the optical axis of the first main light source 7a is directed toward the second reflecting mirror 8 and at a position where the optical axis of the second main light source 7b is directed toward the second reflecting mirror 8 respectively. It is installed so that it can rotate in the direction of the arrow. The other structure is the same as that of the first embodiment.

In Example 7, the first main light source 7a and the second main light source 7b are used as main light sources, the first reflecting mirror 14 and the second reflecting mirror 8 are used as reflecting mirrors, and the first reflecting mirror is used. By rotating 14 so that the optical axes of the first main light source 7a and the second main light source 7b are respectively directed to the second reflecting mirror 8, for example, when the first main light source 7a is cut off, the first reflection The second main light source 7b can be used by rotating the mirror 14. By doing this, it is possible to continuously project an image of a transparent material on the screen.

Further, in the seventh embodiment, since the optical axes of the first main light source 7a and the second main light source 7b are directed toward the direction of the material table 2, both light sources are used when projecting an opaque material. It is possible to directly illuminate the material 3 with 7a and 7b and project the image brightly and clearly on the screen.

(Embodiment 8) FIG. 9 is a block diagram of an embodiment of the eighth projector (hereinafter, referred to as Embodiment 8) and corresponds to FIG.

In the projector of the eighth embodiment, the optical axes of the respective main light sources 7a and 7b are arranged between the first main light source 7a and the material table 2 and between the second main light source 7b and the material table 2 in the seventh embodiment. It has a structure in which third reflecting mirrors 15a and 15b facing the direction of the data base 2 are installed, respectively.

According to the projector of the eighth embodiment, the material can be illuminated through the third reflecting mirrors 15a and 15b. Therefore, even if the material is opaque, the image is uniformly bright. Then, it can be projected on the screen.

[0065]

[Effect of device]

 (1) According to the first projector, since a reflective condensing Fresnel lens for directly pressing the material is attached to the material holding plate, if the material is transparent, even if it is a bright room, Images can be projected as bright and clear images.

(2) According to the second projector, since the optical axis of the main light source in the first projector can be changed, the image of the transparent material as well as the opaque material can be changed. Can be projected as a bright and clear image.

(3) According to the third projector, since the transmission type Fresnel lens having the convex lens surface is used as the material table in the first projector, not only transparent material but also opaque material is used. Even if it exists, the image can be projected as a bright and clear image.

(4) According to the fourth projector, the light-shielding plate or the light-scattering plate is installed on the optical axis of the main light source in the first projector. However, the image can be projected as a bright and clear image.

(5) According to the fifth projector, the transmission type Fresnel lens having the convex lens surface is used as the data base in the first projector, and the light shielding plate or the light scattering is provided on the optical axis of the main light source. Since it has been installed, the image can be projected as a bright and clear image, not only for transparent materials but also for opaque materials.

(6) According to the sixth projector, since the sub light sources are provided in the first to fifth projectors, even if the material is opaque, these sub light sources are mainly used. By turning on all the lights together with the light source, the image can be projected as a bright and clear image.

(7) According to the seventh projector, the first main light source and the second main light source are used as main light sources, the first reflecting mirror and the second reflecting mirror are used as reflecting mirrors, and the first reflecting mirror is used. By changing the position of the reflecting mirror, the optical axes of both main light sources can be respectively directed to the second reflecting mirror, so when one main light source is cut off, the other main light source is used for projection. You can continue.

(8) According to the eighth projector, the light of the main light source is applied to the material by the third reflecting mirror provided in the seventh projector, so that even an opaque material is bright. It can be projected as an image.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of a projector according to a first embodiment.

FIG. 2 is a partial vertical sectional view of a projector according to a second embodiment.

FIG. 3 is a partial vertical sectional view of a projector according to a third embodiment.

FIG. 4 is a partial vertical sectional view of a projector according to a fourth embodiment.

FIG. 5 is a partial vertical sectional view of a projector according to a fifth embodiment.

FIG. 6 is a partial vertical sectional view of a projector according to a sixth embodiment.

FIG. 7 is a partial vertical sectional view of a projector according to a seventh embodiment.

8 is a cross-sectional view of the projector of FIG.

FIG. 9 is a cross-sectional view of the projector according to the eighth embodiment.

FIG. 10 is a partial vertical sectional view of a conventional projector.

[Explanation of symbols]

 1 Main Case 2 Material Stand 3 Material 7 Main Light Source 7a First Main Light Source 7b Second Main Light Source 8 Reflecting Mirror (Second Reflecting Mirror) 9 Projection Lens 10 Reflective Condensing Fresnel Lens 11 Transmission Fresnel Lens 12 Light Shield 13 Sub-light source 14 First reflecting mirror 15a, 15b Second reflecting mirror

Claims (8)

[Scope of utility model registration request] 1. A material placed on a light-transmissive type material table is pressed from above by a material pressing plate, and the material is indirectly illuminated via a reflecting mirror by a main light source arranged below the material table. A projector for projecting an image of the material on a screen through a projection lens, when the material is pressed on the material holding plate,
A projector with a reflective condensing Fresnel lens in direct contact with it. 2. The projector according to claim 1, wherein the main light source is rotatable or movable so that an optical axis thereof can be changed between a reflecting mirror direction and a data base direction. 3. The projector according to claim 1, wherein a transmissive Fresnel lens whose upper surface is a flat surface and whose lower surface is a convex lens surface is used as the material table. 4. The projector according to claim 1, wherein a light shielding plate or a light scattering plate is installed near the main light source and on the optical axis of the light source. 5. A transmission type Fresnel lens whose upper surface is a flat surface and whose lower surface is a convex lens surface is used as said data base, and a light shielding plate or a light is provided in the vicinity of said main light source and on the optical axis of said light source. The projector according to claim 1, further comprising a scattering plate. 6. At least one auxiliary light source for directly illuminating a material is provided near the main light source.
The projector according to any one of 4 and 5. 7. A first main light source and a second main light source, which are arranged in parallel, are used as the main light source, a first reflecting mirror and a second reflecting mirror are used as the reflecting mirror, and the first main light source is used. The second main light source is rotatable and movable so that its optical axis can be changed in the direction of the first reflecting mirror and the direction of the table, respectively, and the first reflecting mirror sets the optical axis of the first main light source to the first optical axis. The projector according to any one of claims 1, 3, 4, and 5, wherein the projector can be positioned at a position facing the two reflecting mirrors and a position at which the optical axis of the second main light source is facing the second reflecting mirrors. 8. The projector according to claim 7, further comprising a third reflecting mirror installed between the first main light source and the second main light source and the data base so as to direct the optical axis of each light source to the data base.