JPS63188128A - Image forming device - Google Patents

Abstract

PURPOSE:To increase the quantity of light and miniaturize a device body and simplify wiring and to suppress the occurrence of noise by forming a light source into a U shape. CONSTITUTION:An exposure lamp 22 as the light source consists of a U-shaped fluorescent lamp. Consequently, the original on an original platen is simultaneously exposed and scanned with the combinational light of the light from a first linear part 22a and the light from the second linear part 22b of the U-shaped fluorescent lamp, and the quantity of the light of the exposure lamp is increased twice. Since the U-shaped fluorescent lamp is used as the exposure lamp 22, both end parts of the fluorescent lamp are arranged on one side of a copying machine body and respective connection terminals as feeding parts provided in both ends of the fluorescent lamp are close arranged. Thus, wiring is simplified because complicated wiring can be avoided, and the noise is reduced because drawing-around of wiring which may cause the noise is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) The present invention relates to an image forming apparatus such as an electronic copying machine.

(Prior Art) As is well known, in an electronic copying machine, an image of a document is read by lighting an n-light lamp (light source) and exposing and scanning the surface of the document.

In such electronic copying machines, a straight-tube fluorescent lamp is used as an exposure lamp, and more recently, a type of apparatus has been developed in which this fluorescent lamp (exposure lamp) also serves as a static elimination lamp.

However, fluorescent lights used in exposure lamps and the like are affected by changes in the environment, and for example, when the room temperature drops, the amount of light becomes insufficient. Therefore, in order to compensate for the insufficient amount of light when the room temperature drops, it has been considered to provide two fluorescent lights and control them as necessary.

However, a straight tube type fluorescent lamp has connection terminals as power feeding sections at both ends thereof. Therefore, with straight tube fluorescent lights, the power supply parts are placed on both sides of the copier body, which requires the body to be made smaller and the wiring that uses high frequencies must be routed in a complicated manner, which generates noise. However, it has disadvantages such as the inability to reduce the amount of

(Problems to be Solved by the Invention) This invention aims to reduce the size of the main body and reduce the φ wiring that uses frequency waves, since the power supply parts are placed on both sides of the copying machine main body in a straight tube type fluorescent light. It is possible to eliminate the drawbacks such as complicated wiring and the inability to reduce the noise generated, increase the amount of light, reduce the size of the main body, and reduce noise by simplifying the wiring. It is an object of the present invention to provide an image forming apparatus that can suppress the occurrence of such problems.

[Structure of the Invention] (Means for Solving the Problems) The image forming apparatus of the present invention optically scans a document by irradiating it with light from a light source, and creates an image corresponding to the document image. In an image forming apparatus for forming an image on a medium, the light source is formed in a U-shape.

(Function) The present invention provides an image forming apparatus that optically scans a document by irradiating light from a light source and forms an image corresponding to the document image on an image forming medium. By forming the image forming apparatus, the power supply section of the light source is arranged on one side of the image forming apparatus.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

3 and 4 schematically show an image forming apparatus of the present invention, for example, an electronic copying machine. The mounted paper feed tray 3 is a paper discharge tray mounted on the left side of the copying machine main body 1. Further, on the upper surface of the copying machine main body 1, a document table 4 is provided which is capable of reciprocating in the left-right direction (in the direction of arrow a in the figure). The document table 4 has a document placement plate (glass plate) 12 on which a document is placed, and a document cover 13 that covers the top surface of the document placement plate (glass plate) 12 .

Furthermore, on the front edge of the top surface of the copying machine body 1, there is a display section 5 that notifies the operating status of each part and the occurrence of an abnormality, number setting keys 61 and 62 for setting the number of copies per copy, and density setting keys 61 and 62 for setting the copy density. An operation panel 10 is provided with input keys including setting keys 7r, 72, a print (copy) key 8, a clear/stop key 9, and the like.

On the other hand, the paper feed tray 2 serves as a manual paper feed tray 15 for feeding paper, and one or more sheets of paper can be set on the manual paper feed tray 15.

Next, the internal mechanism (copying mechanism) of the electronic copying machine will be explained with reference to FIG. In the figure, reference numeral 20 denotes a photosensitive drum disposed approximately in the center of the copying machine main body 1, and this photosensitive drum 20 is rotated in the direction of the arrow in synchronization with the document table 4 by a drive mechanism (not shown). . First, a document image whose surface is charged by a charging device 21 and uniformly irradiated by an exposure lamp 22 consisting of a U-shaped fluorescent light is exposed by a focusing light transmitter (trade name: SELFOC lens array) 23. An image is formed at the portion Ph to form an electrostatic latent image on the surface of the photoreceptor drum 20. This electrostatic latent image is made visible by applying toner by the developing device 24.

On the other hand, the paper (image forming medium) set on the manual paper feed table 15 is taken out one by one by a delivery roller 26 and a separation roller 27, and guided through a paper guide path 28 to a pair of registration rollers 29. The image is sent to the transfer section by a pair of registration rollers 29.

The paper sent to the transfer section comes into close contact with the surface of the photoreceptor drum 20 at the transfer charger 30, so that the toner image on the photoreceptor drum 20 is transferred by the action of the charger 30. This transferred paper is electrostatically peeled off from the photoreceptor drum 20 by the action of the static elimination brush 31 for peeling.
The sheet is conveyed by the feed roller 32 along the conveyance guide 33 and sent to a pair of fixing rollers 34 as a fixing device provided at the end thereof. The transferred image is fixed by passing through the fixing roller pair 34, and the fixed paper is discharged onto the paper discharge tray 3 outside the main body 1.

Further, residual toner on the surface of the photoreceptor drum 20 after the transfer is removed by a cleaner 35, and the photoreceptor drum 20 is further removed by the exposure lamp 22.
The afterimage is erased by the bypass slit light 36, which is a branched light beam, thereby returning to the initial state. In addition, 37 is a cooling fan for preventing a temperature rise in the main body 1, 38 is an ozone filter that neutralizes ozone odor generated from the charging device 21, etc., and 39
is a paper detection switch that detects paper feeding errors and paper jams, 40
is a paper ejection switch that detects paper jams.

Next, the optical system will be briefly explained. As shown in FIG. 1, the exposure lamp 22 as a light source is constituted by a U-shaped fluorescent lamp. The first straight part 22a of the U-shaped fluorescent light that constitutes this exposure lamp 22 is shielded from light by the frame 41, and the second straight part 22b is shielded from light by the frames 42a, 4.
2b and a glue flap 43 serving as a reflecting plate. Further, the frame 42a has a slit 4.
4 is formed, and a static elimination filter 45 is provided above this slit 44. Therefore, by irradiating the photosensitive drum 20 with the light from the second linear portion 22b reflected by the reflector 43, that is, the bypass slit light 36, through the static elimination filter 45,
Afterimages on the surface of the photosensitive drum 20 are erased.

On the other hand, openings are formed in the frames 41, 42a, and 42b, and the original I#j,
W7 is directed toward the plate 12 so that light from an aperture (not shown) formed on the inner side surface of the exposure lamp 22 is uniformly irradiated. That is, the original on the original placing plate 12 is simultaneously exposed and scanned by the light from the exposure lamp 22, that is, the combined light of the first straight part 22a and the second straight part 22b of the U-shaped fluorescent light. It looks like this.

Then, the light reflected from the document by the light irradiation of the exposure lamp 22 is transmitted to the photoreceptor drum 20 via the convergent light transmitter 23.
By forming an image at the exposed portion ph of the photoreceptor drum 2
An electrostatic latent image is formed on the surface of 0. In this case, as shown in FIG. 2, the focusing light transmitting body 23 is located at the center of the exposure lamp 22, for example, at the straight line portion 22a of the Ml of the U-shaped fluorescent lamp within the effective usage range of the exposure lamp 22, and at the second straight line. 22b. As a result, an image corresponding to the original image is formed on the surface of the photoreceptor drum 20.

According to the embodiment described above, the exposure lamp serving as the light source is constituted by a U-shaped fluorescent lamp.

As a result, the original on the original placing plate 12 can be exposed and scanned at the same time by the combined light of the light from the first straight part and the light from the second straight part of the U-shaped fluorescent light. . Therefore, the amount of light from the exposure lamp can be doubled.

In other words, it is equivalent to exposing and scanning the original image using two fluorescent lights, that is, the light from the two fluorescent lights can be used when exposing the original.

Therefore, it is possible to obtain the same amount of light as using two straight tube fluorescent lamps, and by using one U-shaped fluorescent lamp, only one inverter is required.

Furthermore, by using a U-type fluorescent lamp as the exposure lamp, both ends of the fluorescent lamp can be concentrated on one side of the main body of the copying machine.

This makes it possible to arrange the connection terminals provided at both ends of the fluorescent lamp as power feeding sections in close proximity to each other. Therefore, since complicated wiring can be avoided, wiring can be simplified, and since wiring that can be a source of noise can be avoided, noise can be reduced. In addition, the proportion occupied by the power supply system was halved (on one side).
Therefore, the depth (front to rear side) of the copying machine main body can be shortened, and the main body can be made smaller.

Although the above embodiment has been described using an electronic copying machine as an example, the present invention is not limited to this, and can also be applied to a light source for a facsimile, an image scanner, and the like.

It goes without saying that the present invention is applicable not only to copying machines with a movable document table but also to copying machines with a fixed document table.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to increase the light display, reduce the size of the main body, and suppress the generation of noise by simplifying the wiring. An image forming apparatus can be provided.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the main parts of the optical system of an electronic copying machine which is an embodiment of the present invention, and FIG. 2 is a plan view showing the positional relationship between a U-shaped fluorescent lamp and a convergent light transmission body. 3 and 4 respectively show the structure of an electronic copying machine to which the present invention is applied, and the third factor is an external perspective view, and FIG. 4 is a side sectional view. DESCRIPTION OF SYMBOLS 1... Copying machine main body, 4... Document stand, 10... Operation panel, 12... Document placement plate, 20... Photosensitive drum, 21... Charger for charging, 22...・・Exposure lamp,
22a... first straight portion of U-shaped fluorescent light, 22b...
・Second linear part of U-shaped fluorescent light, 23... Focusing light transmission body, 36... Bypass slit light. Figure 1

Claims (2)

[Claims] (1) In an image forming apparatus that optically scans a document by irradiating light from a light source and forms an image corresponding to the document image on an image forming medium, the light source is formed in a U-shape. Features of the image forming device. (2) The image forming apparatus according to claim 1, wherein the light source is a U-shaped fluorescent light.