JP3576348B2 - 1x sensor unit - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is used in image input devices such as copiers, flat head scanners, and facsimile machines. In particular, the present invention prevents dust from entering a reading optical system that guides reading reflected light to an optical element, and facilitates its dust-proof parts. The present invention relates to a detachable detachable sensor unit.
[0002]
[Prior art]
Conventionally, in a reduction optical system using a CCD sensor, the height of a scanner part has been required to be large due to the space of a driving part such as a return mirror. Therefore, the following contact-type image sensor units have been developed to reduce the thickness.
[0003]
FIG. 5 is a cross-sectional view showing a configuration of a conventional unit-size sensor unit. In the figure, reference numeral 11 denotes a lamp for illuminating a document, 12 denotes a sensor substrate on which a sensor chip 13 such as a CCD on which a document reading light is formed is mounted, 14 is a roof mirror array, 15 is a lens array, and 16 and 17 are lenses. Aperture plates 18 provided before and after the array 15 are optical path separating mirrors which deflect the reading light in the direction of 90 degrees and guide the reading light to the sensor chip 13.
[0004]
The optical components are supported and protected by structures such as a frame A19 and a frame B20 using an extruded aluminum product that forms the housing of the unit. Reference numeral 21 denotes a dustproof glass provided on the reading unit for preventing dust from entering the optical system; 22, a light shielding plate; and 23, a lamp cover. Reference numeral 30 denotes a contact glass on which a document is placed.
[0005]
In the above configuration, scanning is performed at a predetermined speed while irradiating the lamp 23 along the surface of the contact glass 30 on which the original to be read is placed, and the reflected light passes through the dustproof glass 21 via the lens system and the optical path separating mirror 18. An image is sequentially formed on the sensor chip 13 of the sensor substrate 12. As a result, an optical image corresponding to the original image is formed on the sensor chip 13 line by line, and the original image is read.
[0006]
Further, since the light-shielding plate 22 and the frame A19 and the frame B20 and the dust-proof glass 21 are fixed to each other by adhesion, the dust accumulated on the dust-proof glass 21 can be read optically except for a gap between the dust-proof glass 21 and the light-shielding plate 22. It is not to enter the system.
[0007]
[Problems to be solved by the invention]
However, in the conventional unit-size sensor unit as shown above, in order to prevent dust from entering the inside of the sensor, each component is bonded and adhered between the dust-proof glass and the light shielding plate or frame thereon. Since it is fixed, it takes time and effort during disassembly during assembly and maintenance, which leads to an increase in cost, and furthermore, there is a problem that there is a high possibility that parts are damaged during disassembly.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has a structure for preventing dust from entering the inside of a sensor, yet easily assembling and disassembling a dustproof portion, and assembling parts with a relatively simple configuration. The purpose is to improve maintainability and maintainability.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the unity magnification sensor unit according to claim 1, scanning is performed while irradiating light along a contact glass surface on which a document to be read is placed, and the scanning is performed. In a unit-size sensor unit having a reading optical system for sequentially reading reflected light and reading a document image, at least the reading optical system is protected, and a cover having an opening through which a light beam from the reading optical system passes; It blocks dust that enters the optical system, and is located directly below the cover and has a dust-proof sheet having substantially the same opening as the opening, and is held by a structure such as a frame. And a dust-proof glass provided in close contact with and fixed so as to cover, and is configured to be detachable from the structure.
[0010]
That is, a cover having an opening through which the light beam from the reading optical system passes to protect the reading optical system, and a cover immediately below the cover to prevent dust from entering the reading optical system. A dust-proof sheet having substantially the same opening as the opening, and a dust-proof glass held by a structure such as a frame and closely attached and fixed so as to cover the opening of the dust-proof sheet. Since it is configured to be detachable from the body, it is possible to prevent dust from entering the reading optical system, and it is easy to assemble and disassemble the dustproof component, which leads to improvement in productivity and serviceability.
[0011]
Further, in the unit-size sensor unit according to the second aspect, instead of the dust-proof sheet , a transparent member which is not tightly fixed to the dust-proof glass and has a transparent opening through which the reading light beam can pass without having the opening. It is provided with a dust-proof sheet made of a material.
[0012]
That is, in addition to the first aspect, since the dust-proof sheet is made of a transparent material having no opening, there is no need to fix the dust-proof sheet and the dust-proof glass by means such as bonding, thereby reducing the manufacturing cost. Becomes possible.
[0013]
According to a third aspect of the present invention, in the unit magnification sensor unit according to the second aspect, the dustproof glass is omitted.
[0014]
That is, in the second aspect, since the dust-proof sheet is made of a transparent material, the dust-proof glass also functions as the dust-proof glass, and the dust-proof glass can be omitted, so that the manufacturing cost can be further reduced.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the unit-size sensor unit of the present invention will be described in detail with reference to the accompanying drawings.
[0016]
[Embodiment 1]
FIG. 1 is a cross-sectional view illustrating a configuration of a unit-size sensor unit according to Embodiment 1. In the figure, 101 is a lamp for illuminating a document, 102 is a sensor substrate on which a sensor chip 103 such as a CCD on which document reading light is formed is mounted, 104 is a roof mirror array, 105 is a lens array, and 106 and 107 are lenses. Aperture plates 108 provided before and after the array 105 are optical path separating mirrors which deflect the reading light in the direction of 90 degrees and guide it to the sensor chip 103.
[0017]
The optical parts are supported and protected by structures such as frames 109 to 113, which form a unit housing, and are manufactured by integral molding and a bottom plate 114. Reference numeral 115 denotes a dust-proof glass provided on the frame 112 for preventing dust from entering the optical system. Reference numeral 116 denotes a dust-proof glass adhered and fixed on the dust-proof glass 115 with an adhesive or glue, and passes a reading light beam. A dust-proof sheet 117 provided with an opening for reading is provided with an upper cover having an opening 117a substantially in contact with the dust-proof glass 115 to protect the entire reading optical system and to be substantially the same as the opening of the dust-proof sheet 116. .
[0018]
Further, the dustproof glass 115 is placed on the frame 112 and is in contact with the frame 112, but the holding thereof is pressed down from above by the upper cover 117 through the dustproof sheet 116. Both ends of the dustproof glass 115 are also in contact with the frame 113. The upper cover 117 is configured to be detachable from the frames 110 and 113 by joining means such as screwing or fitting.
[0019]
In the unit-size sensor unit configured as described above, dust enters between the upper cover 117 and the dust-proof sheet 116 from the opening 117a of the upper cover 117. However, in the above-described configuration, the invading dust stops between the upper cover 117 and the dust-proof sheet 116, or goes out of the gap between the upper cover 117 and the dust-proof sheet 116, or Moving.
[0020]
By the way, it is desirable that the surface of the dustproof sheet 116 is subjected to a black matting process in order to avoid optical diffuse reflection. In addition, if the dust-proof sheet 116 is made of a soft material, the accuracy of the shape is not so required, and the dust-proof sheet 116 can be easily assembled.
[0021]
FIG. 2 is a plan view showing a positional relationship between the dust-proof sheet 116 and the dust-proof glass 115. As shown in FIG. 2, the dustproof sheet 116 is closely fixed to the dustproof sheet 116 around the opening 117 a of the dustproof glass 117 by a fixing method such as bonding.
[0022]
Therefore, by configuring the reading optical system of the unit magnification sensor unit as described above, it is possible to prevent dust from entering the reading optical system, and it is configured to be detachable from the frame. The maintainability is improved, and the economics are also improved due to the lower manufacturing cost.
[0023]
[Embodiment 2]
The second embodiment differs from the first embodiment in that the dust-proof sheet is made of a transparent material through which reading light can pass, and is not tightly fixed to the dust-proof glass and has an opening corresponding to the cover. An example of not having this will be described.
[0024]
FIG. 3 is a cross-sectional view illustrating a configuration of a unit-size sensor unit according to Embodiment 2. In this figure, this unit-size sensor unit uses a dust-proof sheet 301 made of a transparent material through which the light beam of the reading optical system can pass, with respect to the dust-proof sheet 116 having the opening described in the first embodiment. Therefore, the other components and their functions are the same as those in the first embodiment, and therefore, the same reference numerals as those in FIG.
[0025]
That is, since a dust-proof sheet 301 made of a transparent material through which the light beam of the reading optical system can pass is used, and the dust-proof sheet 301 is not tightly fixed to the dust-proof glass 115, a manufacturing process such as bonding is eliminated, so that the dust-proof function is maintained. In this state, it is possible to further reduce the manufacturing cost.
[0026]
[Embodiment 3]
In the third embodiment, the function of the dust-proof glass 115 is replaced by a dust-proof sheet 401 made of a transparent material having a certain rigidity in the configuration of the unit-size sensor unit shown in the second embodiment (see FIG. 3). , The dustproof glass 115 is omitted.
[0027]
That is, as shown in a cross-sectional view illustrating the configuration of the unit-size sensor unit according to the second embodiment in FIG. 4, the dust-proof glass 115 is not required, thereby maintaining the dust-proof function in the second embodiment. The manufacturing cost can be further reduced in the state as it is.
[0028]
【The invention's effect】
As described above, according to the unity magnification sensor unit according to the present invention (claim 1), the cover unit having the opening for protecting the reading optical system and having the light beam from the reading optical system passing therethrough, Immediately below the unit, in order to block dust entering the reading optical system, a dust-proof sheet with an opening almost the same as the opening of the cover unit, and a structure such as a frame are used to hold the opening of the dust-proof sheet. A dust-proof glass, which is attached and fixed so as to cover it, and is configured to be detachable from the structure, so that dust can be prevented from entering and assembly and disassembly of the dust-proof component can be prevented. Since it becomes easy, productivity and serviceability can be improved.
[0029]
Further, according to the unit-size sensor unit according to the present invention (claim 2), the dust-proof sheet is made of a transparent material having no opening, so that the dust-proof sheet and the dust-proof glass can be separated. Since there is no need to fix by means such as bonding, manufacturing costs can be reduced.
[0030]
Further, according to the 1 × sensor unit according to the present invention (claim 3), the dustproof sheet is made of a transparent material in claim 2 so that the dustproof glass also functions as the dustproof glass and the dustproof glass can be eliminated. Therefore, the manufacturing cost can be further reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration of a unit-size sensor unit according to Embodiment 1.
FIG. 2 is a plan view showing a positional relationship between a dust-proof sheet and a dust-proof glass in FIG.
FIG. 3 is a cross-sectional view illustrating a configuration of a unit-size sensor unit according to Embodiment 2.
FIG. 4 is a cross-sectional view illustrating a configuration of a unit-size sensor unit according to Embodiment 3.
FIG. 5 is a cross-sectional view showing a configuration of a conventional unit-size sensor unit.
[Explanation of symbols]
101 Lamp 103 Sensor chip 109 to 113 Frame 115 Dustproof glass 116 Dustproof sheet 117 Upper cover 117a Opening

Claims (3)

In a unity magnification sensor unit having a reading optical system that scans while irradiating light along a contact glass surface on which a document to be read is placed and sequentially guides reflected light obtained by the scanning to read a document image,
A cover portion for protecting at least the reading optical system and having an opening through which a light beam from the reading optical system passes;
A dust-proof sheet that blocks dust entering the reading optical system and is located immediately below the cover and has an opening substantially the same as the opening;
A dust-proof glass, which is held by a structure such as a frame and is closely attached and fixed so as to cover the opening of the dust-proof sheet,
A unit-size sensor unit comprising: Wherein instead of the dust-proof sheet, said not contact fixed to the dust-proof glass, and claim the light beam scanning without having the opening characterized by comprising a dust-proof sheet made of a permeable transparent material 1 1 × sensor unit. The unit-size sensor unit according to claim 2, wherein the dust-proof glass is omitted.

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