JPH0716935U - Attachment for transmissive projector - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify and miniaturize the structure of the entire device. A dazzling prevention effect is realized by also using the material stand cover of the reflection type real projector. A document table 3 on which a transparent original is placed, a light source 6a for irradiating the transparent original, a Fresnel lens 4 for collecting the transmitted light from the light source 6a through the transparent original, and a reflection type real projector. It is provided with a mounting projection 7 and the like that can be attached to and detached from B. When mounted on the reflective real projector B, the transmitted light of the Fresnel lens 4 is transmitted through the material table 13 of the reflective real projector B. Light source case 6 with built-in light source 6a
The arm plate 5 and the arm plate 5 are movable so as to cover above the material table 13 of the reflection type real projector B, and are also used as a material table cover.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an attachment for a transmissive projection device that is detachably attached to a reflective real projector to form a transmissive projection device.

[0002]

[Prior art]

 When projecting a transparent original such as a transparent sheet original using a reflection type actual projector, the original is illuminated by the light source of the projector and the diffused reflected light is imaged on the screen via the projection mirror and projection lens. As compared with the projected image of transmitted light from an overhead projector, the image illuminance is significantly reduced, and a clear projected image cannot be obtained. For this reason, various projectors have been provided in which the function of an overhead projector is added to the actual projector to perform transmitted light projection on a transparent original (JP-A-54-76152). 55-96931 and Japanese Patent Publication No. 52-40980).

[0003]

[Problems to be solved by the device]

 However, since the projection apparatus described in each of these publications is provided with an optical system and other members so as to always have the functions of the actual projector and the overhead projector, the structure of the entire apparatus is generally complicated and large. In addition, there is a problem in that a complicated operation is required when switching between the actual projection and the transmitted light projection.

The present invention has been made to solve the above problems, and an object of the present invention is to mount a real-type projector as needed to configure a transmission type projection device and It can also be used as a document stand cover and has only the minimum required functions in combination with the actual projector to simplify and miniaturize the structure of the entire device, and to eliminate the need for complicated switching operations. It is to provide an attachment for a projection projector.

[0005]

[Means and Actions for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a material table on which a transparent original is placed, a light source for irradiating the transparent original, and a Frenel lens for collecting the transmitted light from the light source through the transparent original. It is equipped with attachment means that can be attached to and detached from the reflection type real projector, and when this attachment is attached to the reflection type real projector, the light transmitted through the Fresnel lens is provided on the reflection type real projector. It is configured to be transparent through the table. When the above attachment is attached to the reflection type actual projector and the transmitted original on the document table is illuminated by the light source, the transmitted light is condensed by the Fresnel lens, and then the inside of the actual projector is transmitted through the sample table of the actual projector. Then, the transmitted light projection image is formed on the external screen through the reflection mirror and the projection lens.

Further, the light source case containing the light source of the attachment and the supporting arm plate are configured to be rotatable, so that when the reflection type actual projector is used, the light source case and the arm are positioned above the material table. It can be covered with a plate so as to function as a document stand cover, and can prevent the dazzling of the irradiation light and its reflected light from the light source of the actual projector and the incidence of light from the outside, and can prevent glare.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an attachment A for a transmission type projection apparatus according to this embodiment, and FIG. 2 is a side view showing a state in which the attachment A is mounted on a reflection type actual projector B to form a transmission type projection apparatus. is there. In FIG. 1, reference numeral 1 is a main body base, and a square frame 2 is connected to the main body base 1. In the frame 2, a material table 3 made of a glass plate or the like on which a transparent original is placed and a Fresnel lens 4 (see FIG. 2) for condensing transmitted light are vertically mounted.

One end of a retractable arm plate 5 that also functions as a material table cover is rotatably supported on the main body base 1, and the other end also functions as a material table cover. The light source case 6 is rotatably supported. As shown in FIG. 2, the light source case 6 has a built-in light source 6a for projection of transmitted light. Further, a mounting projection 7 for detachably mounting the attachment A to the actual projector B is vertically provided on the bottom surface of the main body base 1.

On the other hand, in FIG. 2, a reflection type real projector B includes a light source 12 and a reflection mirror 14 in its housing 11, and a glass plate on which an object such as an original document is placed is placed on the upper surface of the housing 11. A reference table 13 such as the above and a projection lens 15 are attached to the front surface of the housing 11. Further, an attachment hole 16 with which the attachment projection 7 is engaged is provided on the upper surface of the housing 11. Reference numeral 17 is an external screen.

When the attachment A is attached to the actual projector B, the material table 3 and the Fresnel lens 4 of the attachment A and the material table 13 of the actual projector B are overlapped with each other when seen in a plan view. The optical system of the attachment A composed of the light source 6a and the Fresnel lens 4 and the optical system of the actual projector B composed of the reflection mirror 14 and the projection lens 15 have the same optical axis.

In the above configuration, when the actual projector B is used, the attachment A is detached, a projection object such as a document is placed on the material table 13, and the reflected light from the projection object is reflected by the conventional method. Is imaged on the screen 17 via the reflection mirror 14 and the projection lens 15. At this time, the attachment A is attached to the actual projector B, and the arm plate 5 is tilted to the data base 3 side as shown by the alternate long and short dash line in FIG. 2 so that the entire attachment A acts as a cover for covering the material base 13. To do. That is, the attachment A functions as a cover that can be opened and closed with respect to the actual projector B by the attachment projection 7 and the attachment hole 16.

By mounting the attachment A in this way, leakage of irradiation light from the light source 12 and reflected light thereof and incidence of light from the outside are eliminated, and the back of the projection object placed on the data base 13 is eliminated. It can be made dark to obtain an antiglare effect. At the same time, the object to be projected is pressed against the surface of the material table 13 by the Fresnel lens 4 and comes into close contact with the material table 13.

Further, when transmitting light projection is performed by the transmission type projection device, the arm plate 5 and the light source case 6 are raised as shown by a solid line in FIG. Irradiation from source 6a only is required. As a result, the transmitted light from the light source 6a via the transparent original forms an image on the screen 17 via the reflection mirror 14 and the projection lens 15, so that a clear transmitted light projection image similar to that of an overhead projector can be obtained. You can

In the above-described embodiment, when the attachment A is removed and a document or the like is continuously supplied onto the document base 13 by the automatic document feeder to project an actual object, the mounting hole 16 provided in the housing 11 is used as an automatic document. It can also be used to position the feeder. Further, the shapes and structures of the arm plate 5 and the light source case 6 are not limited to those shown in the drawings, and other shapes and structures may be used as long as the arm plate 5 and the light source case 6 can be moved so as to cover the material table 13 of the actual projector B. . Further, the attachment means for attaching / detaching the attachment A to / from the actual projector B is not only a combination of the attachment projection 7 and the attachment hole 16 but also a main body of the attachment A in a groove provided on the housing 11 side, for example. The bottom surface of 1 may be slidable so that it can be attached or detached, or hooks may be used as engaging means.

[0015]

[Effect of device]

 As described above, according to the present invention, a transmission type projection apparatus can be configured by simply attaching an attachment to a conventional reflection type actual projector, and switching between the reflection type actual projection apparatus and the transmission type projection apparatus is possible. In addition to being easy to carry out, when used as a real projector, the attachment can be removed to remove unnecessary functions, so that the structure of the entire device can be simplified and miniaturized.

Further, even when it is used as a reflection type real projector, the attachment can also serve as the document stand cover, so that the members can be effectively used, and light leakage and dazzling can be prevented. Further, since it can be applied to a conventional reflection type real projector without making a great structural change, it has effects such as being economical and versatile.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a usage state of the embodiment of the present invention.

[Explanation of symbols]

 A Attachment for transmissive projection device B Reflective real projector 1 Main body base 2 Frame 3,13 Document stand 4 Fresnel lens 5 Arm plate 6 Light source case 6a, 12 Light source 7 Mounting protrusion 11 Housing 14 Reflection mirror 15 Projection lens 16 Mounting Hole 17 screen

Claims (2)

[Scope of utility model registration request] 1. A material table on which a transparent original is placed, a light source for illuminating the transparent original, a Fresnel lens for collecting transmitted light from the light source through the transparent original, and a reflection type real projector. It is characterized in that it is equipped with a mounting means that can be attached and detached, and that when it is attached to a reflection type real projector, the transmitted light of the Fresnel lens is transmitted through a material table provided in the reflection type real projector. Attachment for transmissive projectors. 2. A transmission type projection apparatus according to claim 1, wherein the light source case containing the light source and the arm plate supporting the light source case are movable so as to cover above the material stand of the reflection type real projector. Attachment for.