JPS6026224B2 - Color copier filter mounting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for attaching a filter to a color copying machine.

More specifically, the present invention relates to a filter mounting device in which a glass filter and a gelatin filter are used together. In color electrophotographic equipment, the original image is red R, green G.
, Blue B color separation filters are used to separate the colors, and each static latent image is developed using cyan, magenta, and yellow developers, and then these developed images are multiple-transferred onto copy paper to obtain a color copy. It is something.

Another use of this device is to make monochrome copies of originals. For example, when copying a colored original using only cyan. In this case, when copying is performed using the R filter among the above filters, colors including cyan colors are formed as latent images and copied, but areas that do not contain cyan colors such as yellow and red are left with latent images. There is an inconvenience that it is not copied because it is not formed. Therefore, there is a method of performing monochrome copying using an ND filter in addition to the above-mentioned three-color filter. Also, when performing color separation using the R, G, and B filters mentioned above, in order to maintain the overall color balance,
Since it is necessary to adjust the amount of light in accordance with the characteristics of each filter, an ND filter may be used in addition to the above-mentioned filter.

In other words, in color copying machines, there are four types of filters: R, G, B, and ND, and from the perspective of color separation characteristics and cost, it would be good if all of them could be achieved with inexpensive gelatin filters. , the color separation characteristics may be unsatisfactory.

In this case, as the color separation filter, an interference filter or the like in which an interference film is deposited on a dry plate glass is used. In our experimental examples, gelatin filters were sufficient for R and ND, but better results in terms of color balance were obtained with interference filters for G and B. In this case, the thickness of the gelatin fill is approximately 0.1
The thickness of the dry plate glass on the other hand is approximately 1.35 cm, and the optical path length naturally varies depending on the filter used. When the thickness of the gelatin film is about 0.1, the increase in optical path length is about 1/3 of the thickness and can be ignored considering the depth of focus of the projection lens, but in the case of dry plate glass, the increase in optical path length is about 0. .4
It becomes about 5 ribs and cannot be ignored. Therefore, when using both gelatin filter and dry plate glass interference filter,
A light separating glass with the same thickness as the above-mentioned dry plate glass is required for the gelatin filter. As mentioned above, an ND filter may also be required for the interference filter, so looking at the configuration of one color separation filter, it consists of a glass plate (for interference filter or light matching) and a gelatin filter. (for color separation or ND). In such cases, the conventional method is to overlap and fix the gelatin filter and the glass plate, but the gelatin filter expands and contracts rapidly depending on temperature and humidity (depending on the arrangement of the color separation filter, the length may vary). (becomes long), which tends to cause sagging.

That is, in this case, the image appears distorted. Therefore,
The gelatin filter and glass plate are fixed separately, and
It is necessary to apply tension to one end with a spring or the like to absorb the amount of expansion and contraction outside the gelatin fill. However, if tension is simply applied with a spring or the like, when the filter is switched for color separation, the shock will cause the gelatin filter to vibrate, resulting in image distortion. Therefore, it is an object of the present invention to suspend thin film filters such as gelatin filters, which are highly elastic and expandable, in a manner that eliminates the above-mentioned drawbacks, to simultaneously install glass plates, and to facilitate the conversion of these filters. The goal is to provide a variety of configurations.

As a means for achieving the above-mentioned object, the present invention provides an apparatus for installing an easily expandable thin film filter in the optical path of a color copying machine, as illustrated in FIGS. 2 and 3. It has protrusions 3061 and 3071 that are continuous in a direction perpendicular to the provided longitudinal direction, and a means for supporting and stretching the end of the filter 302 on the opposite side of the optical path side of the protrusions. is attached between the top ends of both convex parts.

The details of the present invention will be explained below using specific examples with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of an electronic copying machine to which a filter mounting device according to the present invention is applied.

First, the surface of the drum 1 is made of a three-layered photoconductor using a CdS photoconductor, is rotatably supported on a shaft 2, and starts rotating in the direction of an arrow 3 in response to a copy command.

When the drum 1 rotates to the normal position, the document placed on the document table glass 4 is illuminated by an illumination lamp 6 that is integrated with the first scanning mirror 5, and the reflected light is reflected from the first scanning mirror. 5 and a second scanning mirror 7.

By moving the first scanning mirror 5 and the second scanning mirror 7 at a distance ratio of 1:1/2, the original is scanned while the optical path length in front of the lens 8 is always kept constant. After passing through the lens 8 and the third mirror 9, the reflected light image is color-separated by the color separation filter device 10 if necessary, and further passes through the fourth mirror 11 and the dust-proof sealing glass 12, and is then sent to the exposure section 13 to form a drum. The image is formed on 1.

The color separation filter device 10 rotates the axis 301 under predetermined control.
It rotates sequentially with the rotation of , and performs color separation and light one after another. The drum 1 is neutralized by a static eliminator 14, and then charged (for example, to 100%) by a primary charger 15.The drum 1 is subjected to slit exposure with an image irradiated by the illumination lamp 6 in the exposure section 13.

At the same time, AC or primary and reverse magnetic (for example, 1) static electricity removal is performed using the static eliminator 16, and then the entire surface exposure lamp 1
7 to form a high-contrast static latent image on the drum 1. The electrostatic latent image on the photosensitive drum 1 is then visualized as a toner image by the developing device 18.

The developing device 18 consists of four developing devices for yellow 181, magenta 182, cyan 183, and black 184, and the required color toner is produced by the specified developing device corresponding to the color separation filter used for exposure. An image is obtained. Cassette 19
The transfer paper 201 in 1 is fed into the machine by a paper feed roller 211, roughly timed by a first register roller 221, and accurately timed by a second register roller 23, and gripped by a gripper 24.

Next, while the transfer paper 201 passes between the transfer charger 25 and the drum 1, the toner image on the drum 1 is transferred onto the transfer paper.

The gripper 24 rotates by the required number of rotations while gripping the transfer paper 201, and an image of the required number of colors is transferred. After the transfer is completed, the transfer paper is released from the gripper 24, guided to the conveyor belt 27 by the separating claw 26, and further transferred to the fixing roller pair 28, 2.
9, where it is fixed by pressure and heating, and then discharged onto a tray 30. After the transfer, the surface of the drum 1 is cleaned by a cleaning device 31 composed of an elastic blade, and the process proceeds to the next cycle.

FIG. 2 is an overview diagram showing the structure of one filter in the color separation filter device 10 used in the color copying machine shown in FIG. 1, and FIG. 3 is a cross-sectional view of FIG. 2. It is a diagram.
Fixing plates 304 and 305 are installed on the rotating support shaft 301 using screws, etc., and a glass plate 303 is attached to the fixing plates 304 and 305 using fittings 306 and 307. the mounting bracket 306,
Chevron-shaped protrusions 3061 and 3071 are formed at one end of 307, and gelatin filter 302 is stretched between the top ends of the protrusions. The gelatin filter 302 has one end attached to a support plate 308.
, the support plate 308 is inserted between the mounting plates 317 with the screws 314.
is fixed to the mounting plate 317.

Further, the mounting plate 317 is fixed to the fixed plate 305 with screws 315. Further, the end of the gelatin filter 302 is sandwiched between a support plate 309 and a mounting plate 310 and fixed with screws 313. Mounting plate 31 Kawakohamiyotan hole 31
8 and fixedly fixed to the fixing plate 304
is played, and the support plate 310 is slidably held on the surface of the fixed plate 304. The head of the pin 311 is smaller than the large hole of the gourd hole 318. Also, the mounting plate 31
A spring 316 is hooked between the spring hook 3041 of the fixing plate 304 and the spring hook 3041 of the fixing plate 304, and serves to constantly apply tension to the gelatin filter 302 via the mounting plate 310.

In addition, the gelatin filter 302 is attached to the mounting bracket 3 as described above.
06, 307, the height of both ends of the filter is lower than the height of the protrusion, and the height of the filter and the protrusion are It is configured so that saddle force works. Since the filter mounting device has the above configuration, a spring 31 is always attached to the gelatin filter 302 to prevent the filter from sagging.
6 acts, and due to this tension, the filter 302 is pressed against the protrusions 3061, 3071 of the mounting fittings 306, 307 with a constant force, and due to the shock when the filter mounting device rotates due to this pressure force. It functions to reduce the vibration of the filter.

Here, since the diameter of the large hole of the hole 318 is larger than the head of the step screw 311, by attaching the spring 316 and removing it from the mounting plate 3041 and sliding the mounting plate 310, the mounting plate 310 can be easily attached to the fixing plate 304. Since the end of the filter can be removed by simply removing the pin 315, efficiency can be improved when replacing or cleaning the filter 302 to adjust the light intensity or when performance deteriorates due to dirt such as dust. be able to perform work in a specific manner.

Note that the filter holding member 317 may also have the same attachment/detachment mechanism as 310. As described above, according to the configuration of the present invention, a thin leaf-like filter, such as a gelatin filter, which is easily expanded and contracted depending on temperature, humidity, etc., is stretched without sag, and a color separation filter during color separation exposure is stretched. At the time of switching, the vibration of the thin film filter due to shock is reduced,
In addition, adjustment and replacement of the filter can be done extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of an electronic copying machine to which the apparatus of the present invention is applied, FIG. 2 is an overview of one filter configuration of a color separation filter device, and FIG. 3 is a longitudinal sectional plan view thereof. 1 is a photosensitive drum, 10 is a color separation filter device, 18 is a developing device, 301 is a rotating shaft, 302 is a filter, 303 is a glass plate, 304 and 305 are fixed plates, and 316 is a spring. Figure * Now should be 2 Zuko should be 3 Figure

Claims (1)

[Claims] 1. In a device for installing an easily expandable thin leaf filter in the optical path of a color copying machine, a convex portion continuous in a direction perpendicular to the longitudinal direction provided on both sides of the optical path, and a convex portion on the opposite side of the optical path of the convex portion are provided on both sides of the optical path. 1. A filter mounting device for a color copying machine, characterized in that the filter is mounted between the top ends of both convex portions, and the filter is mounted between the top ends of both convex portions.