JPH06222653A - Method for projecting original for overhead projector and image forming device used therein - Google Patents

Abstract

PURPOSE:To efficiently form and project an original for an overhead projector by setting the original for the overhead projector formed by an image forming device on a placing part provided on the upper part of an image forming device main body and forming and projecting the image of the original for the overhead projector on a screen through an image formation optical system. CONSTITUTION:An illuminating lamp 16 for the overhead projector is fixed inside a copying machine main body, and an illumination diffusing lens 17 is arranged and fixed above the lamp 16, furthermore a flat lens 18 is arranged and fixed above the lens 17, respectively. For example, a Fresnel lens is used as the flat lens 18, and the Fresnel lens 18 constitutes the placing part for the original 19 for the overhead projector provided at the upper part of the copying machine main body. The image formation optical system consisting of an image formation lens 20 and a mirror 21 is installed in the copying machine main body, then the image formation optical system is arranged above the copying machine main body. When the copying machine is not used, the flat lens 18 functioning as the original placing part is covered with a platen 1 and a press plate 2 and protected from the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming an image of an original for an overhead projector formed by an image forming apparatus on a screen, and an image forming apparatus used therefor.

[0002]

2. Description of the Related Art At a lecture, a lecture, a conference, or the like, it has been widely practiced to project an image of an original for an overhead projector onto a screen using the overhead projector. In general, such an original is usually prepared by an image forming device such as a copying machine or a printer. That is, an original for the overhead projector is created by an image forming device prepared in addition to the overhead projector, and the original is projected on the screen by the overhead projector. However, in such a system, it is necessary to prepare both the image forming device and the overhead projector, and thus a large installation space for two devices is required. Moreover, it is necessary to create a manuscript for the overhead projector by the image forming device before starting a lecture, a meeting, or a lecture, and even if a manuscript is needed during a lecture or the like, it takes time immediately. It is difficult to make a manuscript. Imaging device and overhead projector 2
It is also possible to prepare a manuscript during the lecture by preparing a device for the lecture at the lecture hall, etc.
Space is required to install two devices at the venue. Not only this, the manuscript must be created and the projection work must be performed while moving back and forth between the image forming device and the overhead projector, and the operation must be very complicated.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art and to make an original for an overhead projector and project it in a small space, so that a lecture or the like can be performed efficiently. A method of projecting an original for an overhead projector, and an image forming device used for the method.

[0004]

In order to achieve the above object, the present invention sets an original for an overhead projector created by an image forming device on a mounting portion provided on an upper part of the image forming device main body, There is proposed a projection method for an overhead projector document, which is characterized in that an image of the overhead projector document is image-projected on a screen via an imaging optical system arranged above the mounting portion.

Further, according to the present invention, a platen for placing a document, which is movably supported on an upper portion of the image forming apparatus main body, a pressure plate for pressing a document which is movable integrally with the platen, and an upper portion of the image forming apparatus main body. Mounted on the screen and covered by the pressure plate when not in use and opened by moving the pressure plate when in use, and an image for the overhead projector document set on the table is formed on the screen. An image forming apparatus including an image forming optical system for projecting is proposed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment in which the image forming apparatus according to the present invention is configured as an electronic copying machine. The basic structure of this copying machine is the same as that of an ordinary copying machine. That is,
As shown in FIG. 3, a platen 1 is supported on the upper part of the main body of the copying machine so as to be movable in the left-right direction in the figure, and a pressure plate 2 for pressing the original is provided which is movable integrally with the platen 1. A document (not shown) to be copied is placed on the sheet and is pressed by the pressure plate 2. The platen 1 is moved from the home position shown in FIG. 3 toward the right side of the drawing, at which time the light source 3 is turned on to illuminate the document surface. The reflected light passes through the lens 4, reaches the surface of the photoconductor 5 whose surface is charged in advance by the charging charger 6, and which is rotationally driven in the clockwise direction. As a result, an original image is formed on the surface of the photoconductor to form an electrostatic latent image, and the latent image is visualized by the toner when passing through the developing device 7. This visible image is transferred onto the transfer paper 10 fed from the paper feed cassette 9 by the paper feed roller 8.
Is transferred by the transfer charger 11. After the transfer, the surface of the photoconductor is cleaned of residual toner by the cleaning device 12, and is subjected to the charge removal action by the charge removal charger 13. The transfer paper onto which the visible image has been transferred has the visible image fixed by the fixing device 14, and is then discharged onto the paper discharge tray 15. In this way, the illustrated copying machine can be used as a normal copying machine.

The copying machine shown in FIGS. 1 to 3 has each element constituting an overhead projector in addition to the above-mentioned image forming element. That is, as is clear from FIG. 3, an illumination lamp (hereinafter referred to as an OHP lamp) 16 for an overhead projector is fixed in the main body of the copying machine, an illumination diffusing lens 17 is provided above it, and a flat lens 18 is provided above it. It is fixedly placed. A Fresnel lens, for example, is used as the flat lens 18,
In this example, the Fresnel lens 18 constitutes a mounting portion for a document (hereinafter referred to as an OHP document) 19 for an overhead projector, which is provided on the upper part of the main body of the copying machine.
As the OHP document 19, a transparent or semitransparent recording medium, for example, a synthetic resin film on which a predetermined image is formed is used. Further, as clearly shown in FIGS. 1 and 2, the copying machine main body is provided with an imaging optical system including an imaging lens 20 and a mirror 21 supported by the main body or independent from the main body. The optical system is arranged above the main body of the copying machine.

When the copying machine is not in use, the flat lens 18 as the OHP document placing portion is covered by the platen 1 and the pressure plate 2 as shown in FIG. For this reason,
The flat lens 18 is protected from the outside, and it is possible to prevent such a defect that the flat lens 18 is scratched.

When the copying machine is used as an overhead projector, the platen 1 and the pressure plate 2 are moved to the positions shown in FIGS. 2 and 3 (home position in this example). As a result, the flat lens 18 is opened to the outside, and the OHP original 19 is placed on the flat lens 18 as shown in FIGS. 2 and 3, and the OHP lamp 16 is turned on. As a result, similarly to the conventional overhead projector, the light from the OHP lamp 16 is spread by the diffusion lens 17 so as to illuminate the entire OHP document 19, and the light passes through the flat lens 18 and then illuminates the OHP document 19. To do. O
The light that has passed through the HP original 19 passes through an imaging lens 20, is reflected by a mirror 21, and then reaches an external screen 22, where an image of the OHP original is imaged and projected. Imaging lens 2
There is no difference from the conventional overhead projector in that 0 is movable in the optical axis direction and the focus is adjusted during projection by adjusting the position.

Since the copying machine itself has the function of the overhead projector as described above, an OHP original can be created by this copying machine and this can be immediately projected on the screen 22. That is, the transfer paper 1 shown in FIG.
A recording medium for OHP original is used as 0, and an OHP original is created by copying a predetermined image on this recording medium as described above. Then, as described above, the placing portion, that is, the flat lens 18 provided on the upper portion of the main body of the copying machine is opened, and the OHP original prepared by the copying machine is set thereon, and the flat lens 18 is continued.
The image of the OHP document may be image-projected on the screen 22 via the image-forming optical system including the image-forming lens 20 and the mirror 21 arranged above the.

Using the illustrated copying machine, the above-mentioned O
Since the HP manuscript projection method can be adopted, by installing this copier in a venue such as a lecture or a conference, even when a manuscript is needed on the spot, it can be processed by the normal copying process of the copier. The OHP original created immediately can be placed on the flat lens 18 as it is and projected on the screen 22. At that time, since it is not necessary to install two devices, a copying machine and an overhead projector, as in the conventional case, the installation space can be kept small, and the copying machine itself is equipped with an overhead projector. Moreover, it is possible to efficiently create an OHP original and project it, and there is no need to go back and forth between the copying machine and the overhead projector as in the conventional case. Also, the finished state of the OHP manuscript can be confirmed on the spot, and the lecture, the conference, the lecture, etc. can be efficiently performed. Further, the user does not need to purchase both the copying machine and the overhead projector and install them, respectively, and it is possible to reduce the purchase cost and save the installation space when not in use.

Imaging lens 2 attached outside the body of the copying machine
The mirror 20, the mirror 21, and the supporting device thereof are provided separately from the main body of the copying machine or are detachably connected to the main body when the function of the overhead projector is not required. Can be kept away from the main body of the copying machine, and it is possible to prevent inconveniences that these disturb the copying work. Further, the imaging lens 20 and the mirror 21
A user who does not need the overhead projector function can purchase the lens 20 and the mirror 21 at a later date, if necessary, so that the burden on the user can be reduced.

Although the present invention can be applied to a copying machine other than the illustrated type and various image forming apparatuses other than the copying machine, the copying lens 4 is fixed and the platen 1 and the pressure plate 2 are fixed as in the illustrated copying machine. When applied to a moving type image forming apparatus, when the platen 1 and the pressure plate 2 are brought to the positions shown in FIGS. 2 and 3, the copying machine main body portion on the right side in the drawing is largely exposed. Even if the size is not particularly larger than the conventional one, the elements for the overhead projector, such as the flat lens in the example shown in the figure, can be arranged in the space on the right side, and space saving or compact design is possible.

[0015]

According to the method of projecting an original for an overhead projector according to the first aspect, it is possible to efficiently create the original and project it.

According to the image forming apparatus of the second aspect, in addition to the above-described effect, the image forming apparatus itself has the function of the overhead projector, so that one image forming apparatus has two functions. Therefore, the entire structure can be made compact and the installation space can be reduced. Moreover, when not in use, the placing portion of the original for the overhead projector can be covered with the pressure plate, so that the placing portion can be reliably protected.

[Brief description of drawings]

FIG. 1 is an external perspective view of an image forming apparatus configured as a copying machine.

FIG. 2 is a perspective view when the copying machine shown in FIG. 1 is used as an overhead projector.

FIG. 3 is a schematic cross-sectional view of the copying machine shown in FIGS. 1 and 2.

[Explanation of symbols]

 1 Platen 2 Pressure Plate 19 Overhead Projector Document 22 Screen

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasunori Kawaishi 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Junji Nakai 1-3-6 Nakamagome, Ota-ku, Tokyo Stock company Ricoh

Claims (2)

[Claims] 1. An overhead projector original document created by an image forming apparatus is set on a mounting portion provided on an upper part of the image forming apparatus main body, and an imaging optical system disposed above the mounting portion is set. A method of projecting an original document for an overhead projector, which comprises projecting an image of the original document for an overhead projector on a screen through the image projection. 2. A platen for placing a document, which is movably supported on the upper part of the image forming apparatus main body, a pressure plate for pressing the original that is movable integrally with the platen, and attached to the upper part of the image forming apparatus main body. For placing an overhead projector original document, which is covered by the pressure plate when not in use and opened by the movement of the pressure plate when in use, and an overhead projector original document set on the placing part, to project an image on the screen. Image forming apparatus comprising the image forming optical system of.