JPS62205379A - Image forming device - Google Patents

Abstract

PURPOSE:To keep picture quality excellent by permitting the optical path of an optical system in a screen unit to orthogonally intersect with that of an optical system in a device main body. CONSTITUTION:The screen unit 31 is integrally installed on one upper side of the electronic copying machine main body 1 in a vertical state, keeping away from an original platen 4. A screen 32 in the unit 31 is stretched between winding cores 33 and 34 vertically disposed, and vertically wound and traveled. The optical system 35 in the screen unit 31 is comprised of a fluorescent lamp 36, the 1st mirror 37, a lens 38 and the 2nd mirror 39, all of which are vertically installed. For copying an image stated on the screen 32, light from the fluorescent lamp 36 is irradiated to wind and scan the screen 32 in the direction of an arrow, and the reflected light beams are image-formed on a photosensitive drum 18 to form an image. Thus the screen unit 32 is installed on one upper side of the copying machine main body 1, keeping away from the original platen 41, whereby an easy-to-handle copying machine 1 can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Structure of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus comprising, for example, an electronic copying machine equipped with a screen unit (electronic blackboard).

(Prior Art) As this type of image forming apparatus, those shown in FIGS. 4 to 10 are known. That is, numeral 1 in the figure is an electronic copying machine, and a screen unit 3 is provided on the upper surface of a main body 2 of the electronic copying machine 1. The screen unit 3 is detachably attached to the main body 2 of the electronic copying machine 1 via bins 4, as shown in FIG.

As shown in FIG. 6, inside the screen unit 5,
A screen 9 is provided stretched between the first and second winding cores 7 and 8, and this screen 9
The winding cores 7 and 8 are driven by first and second motors 1θ and 11 to be wound.

Further, inside the screen unit 6, as shown in FIG.
A lens 14 and second to fourth mirrors 15, 16, and 17 are provided. The fluorescent lamp 12 is opposed to the screen 9 wound around the first winding core 7 of the screen unit 5, as shown in FIG.

On the other hand, as shown in FIG. 9, the copying machine main body 1 is provided with a photosensitive drum 18 and an optical system 19 for scanning a document set on a document table.

The optical system 19 includes a fluorescent lamp 20 and first to third mirrors 2.
1 to 23, a lens 24, and a fourth mirror 25. The fourth mirror 25 is rotatably provided as shown in FIG. 9, and is selectively rotated to the position shown by the solid line when the electronic copying machine 1 is used, and to the position shown by the broken line when the screen unit 3 is used. It has become so.

When a user copies an image written on the screen 9 of the electronic whiteboard 3, the screen 9 is rolled up while being scanned with light (by the fluorescent lamp 12), and the reflected light is As shown in FIG. 9 and FIG. 1O, an image is formed on the photosensitive drum 18 via the first mirror 13 lens 14 and the second to fourth mirrors 15 to 17 to form an electrostatic latent image. After this # latent image is developed by a developing device (not shown), the paper P! is fed from the paper feed cassette 26 or 27. (
Pg) and is discharged onto the discharge tray 28.

Note that when using the electronic copying machine 1, as shown in FIG.
An original is set on the holder, and the original is scanned using a fluorescent lamp 20. The reflected light from the original is imaged on the photosensitive drum 18 via the third mirrors 21 to 23, the lens 24, and the fourth mirror 25, thereby forming an electrostatic latent image.

This electrostatic # image is developed in the same manner as described above, and then
(P!) and is discharged onto the discharge tray 28.

(Problems to be Solved by the Invention) However, in the conventional apparatus, since the optical path of the optical system of the screen unit 5 was configured to be parallel to the optical path of the optical system of the electronic copying machine, the reflected light from the screen 9 was In order to guide the light to the photosensitive drum 18, the optical path must be changed many times. Therefore, the number of reflecting mirrors 13, 15, 16, 17 constituting the optical system increases, resulting in an increase in cost and a decrease in the amount of light, resulting in poor image quality. Furthermore, when using an electronic copying machine, the screen unit 5 must be removed, which is troublesome.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to simplify the structure of the optical system of the screen unit, and also to simplify the structure of the image forming mechanism on the apparatus main body side without removing the screen unit. An object of the present invention is to provide an image forming apparatus that can use the following methods.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention has a configuration in which the optical path of the optical system of the screen unit is orthogonal to the optical path of the optical system on the device main body side, and the screen unit is connected to the device. This device is characterized by being provided on the top surface of the main body, avoiding the document table.

(Function) The reflected light from the screen can be guided linearly to the image carrier, and the image forming mechanism on the main body side of the apparatus can be used without removing the screen unit.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 to 3. Note that the same parts as those shown in FIGS. 4 to 10 are given the same numbers, and the explanation thereof will be omitted. In the figure, reference numeral 31 denotes a screen unit, and the cono-screen unit 31 is integrally erected vertically on one side of the upper surface of the main body 1 of the electronic copying machine, avoiding the document table 4.

The screen 32 in this screen unit 31 is on the top,
It is stretched between winding cores 33 and 34 disposed below, and is wound and run along the upward and downward directions. The optical system 35 in the screen unit 31 includes a fluorescent lamp 36 and a first mirror 37 disposed along the upper and lower directions. Lens: Consists of I8 and second mirror 39.

When a user copies an image written on the screen 32, the screen 32 is irradiated with light from the fluorescent lamp 36 and the screen 32 is wound up in the direction of the arrow. And screen 32
The reflected light is imaged on the photosensitive drum 18 via the first mirror 37, lens 38, and second mirror 39 to form an image.

As mentioned above, since the screen unit 32 is provided on one side of the top surface of the electronic copying machine main body 2, avoiding the document table 4,
When using the electronic copying machine 1, a document can be set on the document table 41 and copied without removing the screen unit 31.

Furthermore, since the optical path of the reflected light from the screen 32 guided by the optical system 35 of the screen unit 31 is orthogonal to the optical path of the optical system 19 of the copying machine 1, the mirror constituting the optical system 35 of the screen unit 3 is 2 pieces (
Only the first mirror 37 and the second mirror 39) are required, and the structure of the optical system 35 can be simplified, the amount of light does not decrease, and costs can be reduced.

Note that the present invention is not limited to the above embodiment,
Of course, various modifications can be made within the scope of the gist.

〔Effect of the invention〕

As described above, according to the present invention, the structure of the optical system in the screen unit can be simplified, the cost can be reduced, and the amount of light does not decrease, making it possible to maintain good image quality.

Furthermore, since the screen unit is provided avoiding the document table of the apparatus main body, the image forming means on the apparatus main body side can be used without moving the screen unit, which is advantageous in that it does not take much time.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a configuration diagram showing the optical system of an electronic copying machine and a screen unit from the front side, FIG. 2 is a side view thereof, and FIG. The figure is a perspective view showing the entire device; FIGS. 4 to 10 show a conventional example; FIG. 4 is a perspective view showing the entire device; FIG. 5 is a perspective view showing the screen unit removed; Fig. 6 is a perspective view showing the screen, Fig. 7 is a perspective view showing the optical system, Fig. 8 is a plan view thereof, and Figs. 0 2... Apparatus main body (electronic copying machine main body), 18... Photosensitive drum (image carrier), 19... Optical system, 32... Screen, 35... Optical system. Applicant's representative Patent attorney Takehiko Suzue-9= Figure 1 Figure 2 Figure 3 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] A device body includes a light source that scans light onto a document set on a document table and an optical system that forms an image of reflected light from the document on an image carrier, and the document table is mounted on one side of the top surface of the device body. A screen unit is further provided with an optical system that forms an image of reflected light from the screen on the image carrier, the optical system of the screen unit further comprising a screen that is erected so as to be avoided and a light source that scans light onto the screen. An image forming apparatus characterized in that an optical path of the image forming apparatus is configured to be orthogonal to an optical path of an optical system of the apparatus main body.