JPS61201231A - Dirt preventing device of copying machine optical system - Google Patents

Abstract

PURPOSE:To prevent an optical system from being stained with suspended toner, etc., by providing at least one air blowing means which blows out air almost in the opposite direction from the air blowing-out direction of an air blowing means. CONSTITUTION:A duct 14 is installed between a lamp housing 9 and a lower drum type photosensitive body 3 and partitioned internally into a right and a left parts, and the blowoff outlet of the left duct 14a is directed to between a small-diameter lens array 2 with short focus and the drum type photosensitive body 3. The air blowoff outlet of the right duct 14b is directed to between a developing device 6 and the photosensitive body 3; and air flows from both air blowoff outlets are nearly opposite in direction. Fresh air is sent in the duct 14 from the front and rear and isolated from the air in the machine before it is blown out of the outlets, so the invariably fresh air is blown out of the outlets.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing contamination of an optical system of a copying machine by toner, etc., using a short focus and small diameter lens array.

[The Kako dish short focus small diameter lens uses a converging light transmitting material made of fibers processed from glass or plastic material and has a symmetrical refractive index distribution with respect to the central axis as an optical lens, and a group of three small diameter lenses. There is an optical system that is used as a relay imaging optical system and is equivalent to the above-mentioned convergent light transmission body.

When a short-focus, small-diameter lens is used in the optical system of a copying machine, the optical system can be integrated into the copying machine and can be compactly accommodated, so there is an advantage that the copying machine itself can be made smaller.

Figure 2 shows a schematic diagram of the interior of a copying machine using a short focus, small diameter lens.

A platen glass 01 is provided on the upper surface of the copying machine casing, and a document 02 is moved to the left on the platen glass 01.

A short focal length small diameter lens array 03 is disposed directly under the lath 01 of the platen, and a drum-shaped photoreceptor 04 is further supported below it so as to rotate around a rotation axis oriented in the front-rear direction.

The short-focus small-diameter lens array 03 is elongated in a direction parallel to the rotation axis of the drum-shaped photoreceptor 04, and has 0-focus small-diameter lenses arranged with a distance equal to the width of the photoreceptor.

Around the drum-shaped photoreceptor 04, in clockwise order in FIG.
3. An exposure lamp 06, a developing device 07, a transfer device 08, a peeling device 09, a cleaning device 010, etc. are arranged, and a fixing device 011 is arranged below the cleaning device 010.

The light projected from the exposure lamp 06 is transmitted to the platen glass 01.
The reflected light passes through the short focus and small diameter lens array 03 and reaches the surface of the photoreceptor 04 to form an image.

The drum 11-shaped photoreceptor 04 is charged on its surface by a charger 05 to form a J-shaped electrostatic latent image on the optical system, and then subjected to adhesion of 1 hener by a developer 07, and transferred to a transfer device 08.
The same toner image is transferred onto the paper, the paper is peeled off by a peeler 09, and the tree remaining on the surface is removed by a cleaner 010.

After the transfer, the paper is fixed in a fixing device 011 and then discharged outside.

In this way, each process of copying is performed around the drum L-shaped photoreceptor 04, and in a copying machine using the short focus small diameter lens array 03, the elements of the optical system, especially the short focus small diameter lens array 03, are attached to the photoreceptor. Since the developing device 07 and the cleaning device 010 are installed close to each other, the developing device 07 and the cleaning device 010 are placed close to each other.

Therefore, there is a problem in that the optical system elements are likely to be contaminated by floating particles.

Therefore, in the past, a blower pipe 012 was installed between the short focus small diameter lens array 03 and the developing unit 07, and the air outlet was used to send clean air toward the imaging side surface of the short focus small diameter lens array 03. There is one in which the air is blown out from the air outlet to prevent staining of the lens surface.

However, when this conventional method is used, it has the disadvantage that surrounding floating particles are sucked into the blown air flow, and the tonneau is instead blown onto the lens surface. there were.

The present invention has been made in view of the above, and an object of the present invention is to provide an optical system of a copying machine which can prevent contamination of the optical system by floating 1 henna etc. by providing at least two air outlets. The point is that it provides a dirt prevention device.

The present invention relates to a copying machine optical system using a short-focus small-diameter lens array, and an optical system disposed on or near the image-forming side lens surface of the short-focus small-diameter lens array. It is composed of a blowing means that blows air toward the parts, and at least one or more blowing means that blows air in a direction substantially opposite to the air blowing direction by the blowing means, and the blowing means does not reach the air outlet. By isolating the blown air from the air inside the copying machine, clean air is blown out, and air flows in two or more directions to prevent floating toner from being sucked into the same air flow, allowing clean air to be delivered to the optical system components. It can be sprayed on to prevent stains on the optical system.

One embodiment of the present invention illustrated in FIGS. 1 and 3 will be described below.

FIG. 1 is a sectional view of the main parts of this embodiment, in which 1 is a platen glass, 2 is a short-focus small-diameter lens array, 3 is a drum-shaped photoreceptor, 4 is an exposure lamp, 5 is a charger, 6 is a developer, 7 is a cleaning device.

A removable filter 8 is provided directly below the short focal length small diameter lens array 2, and serves to protect the short focal length small diameter lens array 2 and to cut infrared rays.

The exposure lamp 4 is supported by a lamp housing 9. A reflective surface 10 is formed on the inner surface of the lamp housing 9, and a glass 11 is fitted at the light exit.

The interior space 12 of the lamp housing 9 partitioned by the glass 11, the interior space 13 of the lamp housing 9 formed on the back surface of the exposure lamp 4, and the space 15 around the lens array 2 are accessed from the front as shown in FIG. Clean air from outside the machine is flowed toward the rear, suppressing heat generation caused by the lighting of the exposure lamp 4, and also plays a role in preventing the exposure lamp 4 from becoming dirty.

Further, the platen of the short focal length small diameter lens array 2 also allows clean air to flow from the front to the rear through the lens surface on the lath 1 side and the outer surface of the glass 11, thereby preventing the optical system from becoming contaminated.

Ducts 1 to 14 are installed between the lower drum-shaped photoreceptor 3 of the lamp housing 9, and the ducts 1 to 14 are internally partitioned into left and right, and the left duct 14a has an air outlet with a short focus and small diameter. The right duct 14b has its air outlet facing between the developing device 6 and the drum-shaped photoreceptor 3, and is blown out from both secondary outlets. The air flow is almost in the opposite direction.

Clean air is fed into the duct 14 from the front and rear, and is isolated from the air inside the machine until it is blown out from the outlet, so clean air is always blown out from the outlet.

Conventionally, the air flow was only blown out toward the photoconductor side of the short focal length small diameter lens array 2 by the left duct h14a, so the toner floating in the gap between the drum-shaped photoconductor 3 and the ducts 1 to 14 was blown out. The toner is sucked into the air flow and blown onto the surface of the filter 8, which has the opposite effect.

In particular, since the developing device 6 is installed next to the ducts 1 to 14, there is a high probability that toner leaking from the developing device 6 will enter the gap between the drum-shaped photoreceptor 3 and the ducts 1 to 14.

Therefore, in this embodiment, the right ducts 1 to 14b are provided alongside the left duct 14a, and the air outlet of the right duct is directed toward the developing unit 6 along the surface of the drum-shaped photoreceptor 3, so that the toner is removed. This prevents it from entering the gap between the drum-shaped photoreceptor 3 and the duct 14.

Therefore, the air blown out from the right ducts 1 to 14a does not contain toner, and the air is always clean, thereby preventing contaminants such as toner from adhering to the surface of the filter 8.

In this embodiment, due to the structure of the optical system, the left and right ducts I to 14a, 14
The optical system was prevented from getting dirty by blowing air in two directions from b, but when the optical system has a different structure or arrangement, air flows not only in two directions but in three or more directions, preventing the optical system from getting dirty. It is possible to prevent the system from becoming contaminated.

Kure 1 and Eri The present invention can prevent contaminants such as toner from adhering to optical components such as short focus and small diameter lens arrays, so that clear copied images can always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment according to the present invention, FIG. 2 is a schematic internal view of a copying machine, and FIG. 3 is a perspective view of a main part of this embodiment. 01...Platen glass, 02...Original, 03...
・Short focus small diameter lens array, 04...Drum-shaped photoreceptor, 05...Charger, 06...Exposure lamp, 07...
・Developer, 08...Transfer device, 09...Peeler, 01
0...Cleaning device, 011...Fixing device, 1...
・Platen glass, 2...Short focus small diameter lens array,
3...Drum-shaped photoreceptor, 4...Exposure lamp, 5...
・Charger, 6...Developer, 7...Erase lamp,
8... Filter, 9... Lamp housing, 10.
... Reflective surface, 11... Glass, 12.13... Lamp housing internal space, 14... Duct, 15...
Lamp housing internal space.

Claims (2)

[Claims] (1) In a copying machine optical system using a short-focus small-diameter lens array, a blowing means for blowing air toward an optical component disposed on or near the imaging side lens surface of the short-focus small-diameter lens array; 1. A stain prevention device for an optical system of a copying machine, comprising at least one blowing means for blowing out air in a direction substantially opposite to the air blowing direction. (2) A contamination prevention device for an optical system of a copying machine according to claim 1, wherein the blowing means isolates the blown air from the air inside the copying machine up to the air outlet.