JPH0413712B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an image forming apparatus such as an electrophotographic copying machine, and more particularly to an image forming apparatus that directly copies characters, figures, etc. written on a blackboard (display member). It is something.

[Prior art and problems]

Conventionally, at meetings, lectures, etc., writing on display materials such as blackboards to eliminate the hassle of transcribing characters, figures, etc. written on display materials into notebooks, etc., and to prevent mistakes caused by transcription. A copying device has been proposed that directly copies .

Regarding conventional examples, various copying machines have been proposed that can selectively copy an image written on a sheet serving as a display member and a document on a document table.

The above-mentioned copying machine was composed of a copying section and a display section, and the copying section was mounted so that it could be moved between a position for copying originals and a position for copying on a board by means of a rail provided on the display section. .

The copying section is provided with an exposure opening for display copying, and in the case of copying on the document table, the built-in shutter is closed, and in the case of display copying, the shutter is opened and the image from the display sheet is exposed as described above. The light was introduced through the exposure port to form an image on the photoreceptor drum.

However, in conventional image forming apparatuses with such a configuration, the only thing that can be done is to reduce the characters, etc. on the display section using the display section optical system, form an image on the surface of the photoreceptor drum, and copy it onto paper of a predetermined size. I couldn't do it.

Therefore, in order to copy onto sheets of different sizes, a variable magnification mechanism must be provided in the optical system of the display section, and the variable magnification mechanism of the copying section cannot be used.

Another drawback is that, after the image on the display unit is once copied, the copy must be used as a document and enlarged or reduced in the copying unit to the required size.

[Purpose of the invention]

In view of the above-mentioned conventional drawbacks, the present invention has been developed to scale an image written on a display surface to a desired size, copy it, and use both the optical system of the blackboard and the optical system of the copying machine to display the image on the display section. An object of the present invention is to provide an image forming apparatus that can copy images.

[Key points of the invention]

In order to achieve the above object, the present invention includes a display section having a display surface on which writing and erasing can be performed with a writing instrument, and a document mounting table, and an image of the document placed on the document mounting table or the display surface. In the image forming apparatus, the copying section includes a document imaging optical system that forms an image on a photoreceptor of light reflected from the document exposed by a light source. The present invention is characterized in that a portion of the document mounting table is provided with an auxiliary optical member that cooperates with the document imaging optical system to form an image on the display surface onto the photoreceptor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a copying section of an image forming apparatus according to the present invention.

As shown in FIG. 1, the copying section 2 includes a photosensitive drum 13, a charger arranged around it, a blank lamp, a developing device, a transfer device, a cleaner, a paper feed cassette, a paper feed roller, a timing roll, and a copying unit. The apparatus is comprised of a fixing section that fixes an image on the printed paper, a discharge section that discharges the paper to the outside of the machine, an optical scanning mechanism, a document table, and the like.

The optical scanning mechanism exposes and scans the original image onto the photosensitive drum 13, and includes a halogen lamp 3 for illuminating the original, a copying mirror, a copying lens 4, and the like.

Here, on the upper surface of the copying section 2, an exposure aperture 5 for copying an original is provided, and a document table consisting of an original glass 6 and an original mat 7 is provided in a movable manner. In addition, a part of the original glass 6 (Figs. 1 and 2)
The document mat 7 is the part that extends perpendicularly to the scanning direction of the document table (shaded area in the figure).
Even when the original mat 7 is closed, the portion that is not covered by the original mat 7 is formed of frosted glass 8, and
A tip indicator plate 9 is provided at the other end. and,
When copying the display surface, the original table is moved all the way to the left, and the ground glass 8 portion of the original glass 6 is moved to a position covering the original copying exposure opening 5 and fixed.

The image light of the display surface guided by the display unit optical system is projected and imaged onto the ground glass 8 surface.

On the copying section 2 side, the image on the display surface formed on the frosted glass 8 is used as a document, and a copying operation similar to normal document copying is performed (however, the document table remains fixed and does not move).

On the other hand, the image forming apparatus is composed of a display section 1 and a copying section 2, and the copying section 2 is mounted on a mounting beam 2b and is provided so as to be removable.

FIGS. 3a and 3b are perspective views showing the operating state of the image forming apparatus of the present invention.

In the same figure, when copying a normal manuscript,
The copying unit 2 is pulled out to the front, the document mat 7 is opened, and the document is placed on the document glass 6 to make a copy (see FIG. 3a).

In addition, when copying the display section 1, the copying section 2
, and the characters, figures, etc. written on the display sheet 1a are copied by the copying section 2 (see FIG. 3b).

FIG. 4 is a front view showing the relationship between the display section 1 and the copying section 2 when copying the display section.

In the case of display copying, the document table is moved to the left end, and the ground glass 8 at the end of the document glass 6 is positioned directly above the document copying exposure opening 5 of the copying section 2.

Further, the above-mentioned ground glass 8 may be made of other semi-transparent materials as long as the projected light can be imaged and read from the back side.

Further, at the lower end of the display section 1 and at the exit of the display section optical path, a light shielding member 10 is swingably supported.
The lower surface of the light shielding member 10 has a brush 10
A is planted.

Therefore, the exposure light from the display section 1 is not disturbed by surrounding light.

FIG. 5 is a side view showing the relationship between the display section 1 and the copying section 2. In the figure, the copying section 2 indicated by a solid line indicates a display section copying state, and the double-dashed line indicates a normal copying state.

Further, when transitioning from normal copying to display section copying, the light shielding member 10 is swingably provided and has a brush 10a planted in its lower part, so that the document table of the copying section 2 comes into contact with the light shielding member 10. It won't hurt you when you come into contact with it.

The display unit 1 includes a frame 17, a display sheet 1a, a display optical system 18, and a winding device 19. The display optical system 18 includes a halogen lamp 14, a mirror 12a, and a mirror 12 in the display illumination unit.
b and a display surface side lens 15.

As shown in FIG.
A is provided at the other end of the feed rolls 20b, 20
c and 20d, and is wound up with a winding roll 21.

Further, the rolled up display sheet 1a forms a surface perpendicular to the frame 17 by means of feed rolls 20c and 20d, and is illuminated by a halogen lamp 14 in a blackboard illumination section.

On the display surface of the display unit 1, the display sheet 1a
A back-up board 22 is provided on the back side of the display sheet 1a, so that the display sheet does not bend even when written with a felt pen or the like.

The winding roll 21 is rotated by a drive mechanism (not shown) and winds up the display sheet 1a at a constant speed.

FIG. 6 is a schematic diagram showing the optical system of the display unit.

The display sheet 1a moving while being wound up is illuminated by a halogen lamp 14.
The reflected light of the image illuminated by the image forming apparatus 4 passes through the mirror 12a, the mirror 12b, and the display lens 15 along the display optical path 11, and forms an image on the ground glass 8 provided at one end of the document glass 6 of the copying section 2. Ru.

The image of the display surface formed on the frosted glass 8 is
The electrostatic latent image reaches the photosensitive drum 13 via the mirror of the copying section 2, the copying lens 4, and the mirror, and forms an electrostatic latent image (see FIG. 1). Here, the copying lens 4
A zoom lens is used, and the copying magnification can be changed by simply moving the lens barrel position of the copying lens 4 while keeping the mirror position fixed.

Next, the operation of the image forming apparatus configured as above will be explained.

First, when copying a normal manuscript, please refer to Figure 3a.
As shown in the figure, the copying section 2 is pulled out, the original is placed on the original glass 6, and the glass irradiated with the halogen lamp 3 is placed on the photosensitive drum 13 through the mirror, the copying lens 4, and the mirror. form an image.

The electrostatic latent image formed on the photosensitive drum 13 is
It is developed into a toner image using developing devices placed around it.
After being transferred onto paper by a transfer device, it is ejected from the machine after undergoing a fixing process.

When copying the display part, as shown in FIG. Place it on top.

The characters, images, etc. written on the display sheet 1a are displayed using a halogen lamp 1 in the illumination section of the display section 1.
4, and is irradiated by the display unit optical system 18 via the mirrors 12a, 12b and the display unit side lens 15.
An image is formed on ground glass 8.

The image formed on the frosted glass 8 is transferred to the copying section 2
An image is formed on the photoreceptor drum 13 via the copying lens 4 by the optical system, forming an electrostatic latent image.

The electrostatic latent image on the photoreceptor drum 13 is converted into a toner image by a known developing means and transferred onto a sheet of paper.
It is considered a copy image.

Furthermore, in the present invention, even if the image is on the display unit,
Since an image is formed on the photosensitive drum 13 through the optical system of the copying section 2, it can be reduced to any magnification using the copying lens 4, which is a zoom lens.

〔Effect of the invention〕

According to the image forming apparatus of the present invention configured as described above, characters written on the display section can be displayed as B4, A4,
Copies can be made on any size paper such as B5 or A5.

Further, it is possible to change the magnification of the image on the display surface without separately providing a variable magnification lens for the display section.

Furthermore, the display unit image is set to a predetermined size, e.g. A4.
You can directly copy to the desired size without having to go through the trouble of copying it to a computer and changing its size using a copying machine.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a copying section of an image forming apparatus of the present invention, FIG. 2 is a plan view of a document table used in the present invention, and FIGS. 3 a and 3 b are operation of the image forming apparatus of the present invention. FIG. 4 is a front view showing the relationship between the display section and the copying section when copying the display section; FIG. 5 is a side view showing the relationship between the display section and the copying section; FIG. 6 is a schematic configuration diagram showing the optical system of the display section, and FIG. 7 is a sectional view showing the inside of the display section. 1... Display section, 1a... Display sheet, 2... Copying section, 3... Halogen lamp, 4... Lens for copying, 5... Exposure aperture for copying original, 6... Original glass, 7... Original Matsuto, 8... Frosted glass, 9...
... Tip indicator board, 10 ... Light shielding member, 10a ... Brush, 11 ... Optical path for display section, 12a, 12b ...
... Mirror, 13 ... Photoreceptor drum, 14 ... Halogen lamp, 15 ... Display side lens, 17 ...
Frame, 18... Display unit optical system, 19... Winding device, 20a, 20b, 20c, 20d...
Feed roll, 21, 23... Winding roll, 2
2...Backup board.

Claims (1)

[Claims] 1. A display unit having a display surface that can be written on and erased with a writing instrument, and a document mounting table, and configured to be able to selectively copy the original placed on the document mounting table or the image on the display surface. In the image forming apparatus, the copying section includes a document imaging optical system that forms an image on a photoreceptor of light reflected from the document exposed by a light source, and a document image forming apparatus that forms an image on a photoconductor by reflecting light from the document exposed by a light source; An image forming apparatus comprising: an auxiliary optical member that cooperates with a document imaging optical system to form an image on the display surface onto the photoreceptor.