JP2540889Y2 - Film filter unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film filter unit applied to an electrophotographic apparatus.
The present invention relates to a film filter unit integrally configured with a dustproof glass and a film filter.

[0002]

2. Description of the Related Art Generally, in an electrophotographic apparatus, it is desirable to reproduce an image at a density equal to the relative luminous efficiency of an original image. However, in many cases, the spectral sensitivity characteristics of the photoreceptor used and the emission spectrum of the light source do not match the relative luminous efficiency. In this case, correction is generally performed using a filter.

[0003] As a filter, for example, a lens, a mirror, a light source, and the like for reading a document image are arranged in an optical path so that toner or the like scattered from the image forming system does not enter the optical system. There is one coated on the dust-proof glass provided in the above. However, a filter having such a configuration has an advantage that surface accuracy is good, but on the other hand, it is expensive, and the spectral transmission characteristic tends to vary between processing lots. However, there is a disadvantage that the characteristics are easily varied. Also, in the case of a multilayer coating, the spectral transmission characteristics change depending on the incident angle of the light beam (exposure),
If there is a variation in the incident angle of the light beam, there is a possibility that unevenness in the light amount may occur due to the balance with the photoconductor sensitivity characteristics.

As described above, it is necessary to adjust the balance between the filter and the photoreceptor sensitivity characteristics. However, since a filter coated on dust-proof glass is expensive, an inexpensive film filter is generally used. Further, as a unit (unit) on which the film filter is installed, a flat plate-like support member is adhered to both ends of a resin strip film filter, and tension is applied to the support member by a tension applying means so that the support member at both ends is supported by the support plate. There is something that engages with.

[0005]

However, a flat support member is adhered to both ends of a resin strip film filter, and tension is applied to the support member by a tension applying means to engage the support members at both ends with the support plate. It is necessary to accurately attach the film filter to the support member,
If the sticking position is shifted, a portion to which tension is applied and a portion to which no tension is applied come out, and there is a problem that the film surface is distorted. In addition, since parts such as the support member and the tension applying means are used, the assembling process is complicated, and there is a problem that the detachability and handleability are poor.

The present invention has been made in view of the above, and has as its object to constantly maintain good surface accuracy, simplify the assembling process, and improve the detachability and handleability of a film filter unit. I do.

[0007]

In order to achieve the above object, the present invention is provided on an optical path from an optical system to a photoreceptor surface, and a dustproof means for preventing toner and the like from entering the optical system. Film filter that regulates the spectral distribution of exposure
In the film filter unit consisting of
The contact between the dustproof means and the film filter is prevented.
For this purpose, insert between the dustproof means and the film filter.
The opening is provided so as not to block the optical path
The present invention provides a film filter unit provided with a contact preventing means .

It is desirable that a projection for preventing reverse setting be provided at one end of the contact preventing means . Further, it is desirable that the film filter unit can be detachably set to a mounting portion provided on the apparatus main body. Furthermore, the film filter unit prevents contact
It is desirable that the means be mounted on only one side.

[0009]

In the film filter unit according to the present invention, the film filter is adhered to only one side of the spacer, so that the filter does not wrinkle even in a high-temperature and high-humidity environment or in a aging state, and has a good surface accuracy. Can be maintained. In addition, since the configuration is simple, the assembly process is also simplified. Furthermore, since it is integrated with the dust-proof glass, a new mounting member is not required, and the detachability and handleability are good.
The protrusion provided at one end of the spacer prevents the film filter unit from being set upside down.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded view of the film filter unit 100 of the present invention, which is disposed on an exposure path,
A dust-proof glass 101 for preventing toner from entering the optical system from the image forming system, and a plate-shaped having an opening 102b adhered to a shaded portion shown on the dust-proof glass 101 with a double-sided tape so as not to block an exposure path. And a film filter 103 which is supported on all four sides by the spacer 102 and is adhered to the hatched portion shown on the spacer 102 with a double-sided tape.
It is composed of

As described above, the film filter according to the present invention
The filter unit 100 includes a dustproof glass 101 and a spacer.
102 and a film filter 103
And apply double-sided tape (shaded area) on the upper surface of the dustproof glass 101.
The spacer 102 is adhered through the
Surface on both sides so as to cover the opening 102b
The film filter 103 is connected via the tape (shaded area).
It is worn and integrally configured. Assembled like that
It is arranged on the exposure path in a state where it is set. Here, the film filter 103 regulates the spectral distribution of the exposure (corrects the image so that the image can be reproduced at a density equal to the relative luminous efficiency of the original image), that is, functions as a band bypass filter. The role of preventing contact between the film filter 101 and the film filter 103, that is, the difference in the amount of transmitted light caused by the difference in the number of light reflection surfaces between the contacting portion and the non-contacting portion is prevented.
The film filter 103 has only one side and the spacer 1
02 is attached to the film filter 1
03 heats up faster than the spacer 102, and
This is to prevent distortion of the film surface caused by a difference in thermal expansion coefficient between the film filter 103 and the spacer 102.

FIG. 2 is an explanatory view showing an installation position when the film filter unit 100 of the present invention is applied to an electrophotographic apparatus. The film filter unit 100 has an optical system for reading an original image and an image on a recording paper. A photosensitive member 202 can be attached and detached along a rail 201a provided on a partition plate 201 which separates an image forming system to be formed and shields light. Exposure from the original image is projected from the original 203 through the film filter unit 100. Reference numeral 204 denotes a sixth mirror bracket for supporting the sixth mirror 203.

Next, a method of mounting the film filter unit 100 will be described with reference to a perspective view of a state where the sixth mirror bracket 204 and the film filter unit 100 are installed as shown in FIG. As described above, the film filter unit 100 can be attached and detached along the rail 201a provided on the partition plate 201. In FIG. 3A, the portion where the film filter unit 100 protrudes from the sixth mirror bracket 204 protrudes longer on the near side than on the far side. This is because the front side can be grasped and detached.

The upright bent portion 102a provided at one end of the spacer 102 is provided to prevent upside-down and upside-down reverse setting. , It is possible to prevent the setting from being reversed. If the user tries to set the film filter unit 100 upside down, the hole 301 provided for setting the film filter unit 100 on the main body side plate (not shown) has the shape shown in FIG. The part 102a can be prevented from being set upside down.

In this embodiment, a dustproof glass 101 is arranged on the side facing the image forming system. This is because toner scatters easily on the side facing the image forming system and is easily stained, but the dustproof glass 101 is hardly damaged even if it is strongly wiped during cleaning. Also,
Since the dustproof glass 101 and the film filter 103 are integrally formed, it is possible to clean the dustproof glass 101 and the film filter 103 at one time, which also contributes to the efficiency of work at the time of maintenance.

[0016]

As is clear from the above, according to the film filter unit of the present invention, the film filter unit is provided on the optical path from the optical system to the surface of the photoreceptor, and is provided with dustproof means for preventing intrusion of toner and the like into the optical system. Regulates the spectral distribution of exposure
Film filter unit
Between the dustproof means and the film filter.
Mounted so as not to block the optical path, the dustproof means and the
Equipped with contact prevention means to prevent contact of the film filter
And for which, always maintaining good surface precision, and the assembly process is simplified, thereby improving the detachability and handling of the film filter unit.

[Brief description of the drawings]

FIG. 1 is an exploded view of a film filter unit according to the present invention.

FIG. 2 is an explanatory view showing an installation position of a film filter unit in the electrophotographic apparatus according to the present invention.

3A is a perspective view showing a state where a sixth mirror bracket and a film filter unit are installed, and FIG. 3B is an explanatory view showing a shape of a hole provided for setting a film filter unit on a main body side plate. .

[Explanation of symbols]

REFERENCE SIGNS LIST 100 Film filter unit 101 Dustproof glass 102 Spacer 102a Standing bent portion 102b Opening 103 Film filter 201 Partition plate 201a Rail 204 Sixth mirror bracket 301 Hole

Claims (4)

(57) [Scope of request for utility model registration] 1. A film filter unit which is provided on an optical path from an optical system to a surface of a photoreceptor and includes dustproof means for preventing toner and the like from entering the optical system, and a film filter for regulating a spectral distribution of exposure. In the above, the contact between the dustproof means and the film filter is prevented.
Between the dustproof means and the film filter.
An opening is provided so that it is inserted and does not block the optical path.
Film filter units comprising the contact preventing means are. 2. The film filter unit according to claim 1, wherein a protrusion for preventing reverse setting is provided at one end of the contact preventing means. Wherein the film filter unit, a film filter unit according to claim 1 or 2, characterized in that to mounting portion provided in the apparatus main body can be detachably set in. 4. The apparatus according to claim 1, wherein the film filter is mounted on the contact preventing means only on one side.
4. The film filter unit according to any one of items 1 to 3.