JPH0523667U - Image reading / writing device - Google Patents

Abstract

(57) [Summary] [Object] To provide an image reading / writing apparatus capable of reducing the number of parts and being compact in size. [Structure] A document 21 that can be relatively moved in one direction
On the other hand, the bar light source device 22 that irradiates a linear illumination light along the scanning direction orthogonal to the moving direction, and the light that is emitted from the bar light source device and reflected on the surface of the document is passed through the lens array 23. The light receiving device 25 mounted on the substrate 24 on which the light is incident and the LED array 26 arranged so as to extend in parallel along the light receiving device on the substrate.
And a driving IC 27 disposed on the substrate in the vicinity of the LED array, and the image reading / writing device is configured so that the above-mentioned elements are housed in the main body case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an image reading / writing device capable of reading and writing images in facsimiles, digital copying, and the like.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, an image reading apparatus 1 configured as shown in FIG. 4 is known when reading an image on a document surface in a facsimile, digital copy, or the like. That is, the image reading apparatus 1 moves the document 2 relatively in one direction (the direction of arrow X in FIG. 4) while moving the LED along the scanning direction orthogonal to the moving direction X with respect to the document 2. An image sensor in which linear illumination light is emitted from a bar light source 3 such as a bar light source, and the reflected light reflected from the original 2 is mounted on the substrate 5 via the lens array 4, for example (charge storage photoelectric conversion By reading with a light receiving device 5a such as a CCD (which is an element), the above-mentioned reading operation is sequentially repeated in accordance with the movement of the original 2, and the image information on the original surface is read.

Further, in the case of writing an image on the original surface, an image writing device 7 incorporated in an LED printer 6 as shown in FIG. 5 is known. That is, the LED printer 6 includes a charging device 9, an image writing device 7, and a developing device 11 in which a toner 10 is housed, which are sequentially provided with respect to a photosensitive drum 8 which is rotationally driven, along the rotational direction. , A transfer device 12 for adhering toner to the supplied paper, a peeling device 13 for removing the paper from the drum 8, a cleaning device 14 for removing the toner remaining on the drum surface, and a discharge lamp for removing the electric charge remaining on the drum Toner attached to the paper is provided on the paper by the fixing device 16.

In this case, the image writing device 7 forms an image of the light from the LED array 7a mounted on the substrate at the writing position on the surface of the photosensitive drum 8 via the lens array 7b, and the LED array By appropriately controlling the drive of each LED dot of 7a, a latent image by electrostatic charge is formed on the surface of the photosensitive drum 8 which is rotationally driven.

Therefore, in the case of both reading and writing an image such as a facsimile or digital copy, the image reading device 1 described above is used as a reading head and the image writing device 7 is written. Image reading and writing are performed by incorporating each as a built-in head in the device.

[0006]

[Problems to be solved by the device]

 However, in the configuration in which both the image reading device 1 and the image writing device 7 are incorporated, both the image reading device 1 which is the reading head and the image writing device 7 which is the writing head are respectively lens arrays. Since this lens array usually consists of a refractive index dispersion type lens and the number of parts is relatively large, parts cost and assembly cost increase, and the overall structure becomes large. There was a problem that it would end up.

In view of the above points, the present invention has an object to provide an image reading / writing device that can be reduced in the number of parts and can be configured in a small size.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the image reading / writing apparatus of the present invention applies line-shaped illumination light to a document that is relatively moved in one direction along a scanning direction orthogonal to the moving direction. The bar light source device for irradiating, the light receiving device mounted on the substrate on which the light emitted from the bar light source device and reflected on the surface of the original document enters through the lens array, and the light receiving device mounted on the substrate The device includes an LED array arranged so as to extend close to and parallel to the light receiving device, and a driving IC arranged on the substrate so as to be close to the LED array. It is characterized by being housed in a case.

[0009]

[Action]

 According to the above configuration, the apparatus is arranged so as to face the photoconductor drum with the passage of the reading original interposed therebetween, so that in the case of image reading, the reading position of the original to be read by the light from the bar light source device is set to the line. The image is read by illuminating the light in a circular shape and receiving the light reflected by the surface of the document by the light receiving device through the lens array. Further, in the case of image writing, the driving IC appropriately drives and controls the LED array so that the LED array emits light in a desired pattern, thereby forming a latent image by electrostatic charge on the surface of the photoconductor drum. Then, the image is written.

As described above, since each element for reading an image and each element for writing an image are all housed in the case of the present apparatus, the device can be made compact as a whole and the image reading and the image can be formed. Since the lens array for writing is commonly used, and the light receiving device, the LED array, and the driving IC are mounted on the same substrate, the number of parts is further reduced, and the assembly is easy. , Parts cost and assembly cost can be reduced.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of an image reading / writing device according to the present invention. An image reading / writing device 20 moves an original 21 relatively in one direction (the arrow X direction in FIG. 1). Meanwhile, the LED bar light source 22 irradiates the original 21 with linear illumination light along the scanning direction orthogonal to the moving direction X, and the reflected light reflected from the original 21 is, for example, an erecting equal-magnification system. Image sensor mounted on a substrate 24 through a lens array 23 composed of a gradient index lens, a light receiving device 25 composed of a sensor IC such as a CCD or a-Si sensor which is a charge storage photoelectric conversion element. The image information on the surface of the document is read by sequentially repeating the above reading operation as the document 21 moves.

The above-mentioned configuration is similar to that of the conventional image reading device 1 shown in FIG. 4, but in the image reading / writing device 20 according to the present invention, the light receiving device 25 is arranged on the substrate 24. In order to appropriately drive and control the LED array 26 and each LED dot of the LED array 26 mounted along the side of the LED array 26 so as to extend in parallel with each other. Driving IC 27 is mounted, and each LED dot of the LED array 26 is wire-bonded to the driving IC 27 by a gold wire or the like.

Here, each light receiving element chip 25a of the light receiving device 25 and each LED dot 26a of the LED array 26 are arranged so as to be close to the optical axis of the lens array 23 as shown in FIG. Are located close to each other and near the edges.

The embodiment of the present invention is configured as described above, and when it is used by being incorporated in, for example, a fax machine as shown in FIG. 3, when the image of the original 21 is read, it passes through the reading original passage 28. The supplied document 21 is linearly illuminated at the image reading position by the light emitted from the bar light source 22. The original 21 illuminated in this way is imaged on the light-receiving surface of the light-receiving device 25 via the lens array 23, so that each light-receiving element chip 25a of the light-receiving device 25 reads an image of the original 21. It can be performed.

Further, when writing an image on the original 21, the driving IC 27 drives and controls each LED dot 26 a of the LED array 26 in an appropriate pattern so that the LED array 26 can be controlled. A latent image by electrostatic charge is formed by focusing light on the writing position on the surface of the photosensitive drum 8 through the lens array 23, and this latent image is written by the developing device, the transfer device, and the fixing device. An image is written on the surface of the sheet supplied through the sheet passage 29.

[0016]

[Effect of the device]

 As described above, according to the present invention, the device is opposed to the photoconductor drum with the passage of the read document interposed therebetween, and the reading position of the document is linearly illuminated by the light from the bar light source device. An image is read by receiving the light reflected by the surface with a light receiving device through a lens array, and the driving IC appropriately drives and controls the LED array so that the LED array emits light in a desired pattern. By this, it is possible to form an electrostatic latent image on the surface of the photoconductor drum to write an image. In this way, each element for image reading and image writing in the case of this device can be performed. Since each element is housed in its entirety, it can be made compact in size. Further, since the lens array for image reading and image writing is commonly used and the light receiving device, the LED array and the driving IC are mounted on the same substrate, the number of parts can be further reduced. Therefore, the cost of parts and the assembly cost can be reduced by facilitating the assembly. Thus, according to the present invention, there is provided an image reading / writing device which can be reduced in the number of parts and can be configured in a small size.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an image reading / writing device according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view near a light receiving device of the device of FIG.

FIG. 3 is a schematic view showing a configuration in which the apparatus shown in FIG. 1 is incorporated in an electrostatographic facsimile machine.

FIG. 4 is a schematic sectional view showing an example of a conventional image reading apparatus.

FIG. 5 is a schematic sectional view showing an example of a conventional image writing device.

[Explanation of symbols]

 20 image reading / writing device 21 original document 22 LED bar light source 23 lens array 24 substrate 25 light receiving device 25a light receiving element chip 26 LED array 26a LED dot 27 driving IC

Claims (1)

[Scope of utility model registration request] 1. A bar light source device for irradiating a document which is relatively moved in one direction with linear illumination light along a scanning direction orthogonal to the moving direction, and a bar light source device for irradiating the light source. The light receiving device mounted on the substrate on which the light reflected on the surface of the original enters through the lens array, and the light receiving device arranged on the substrate so as to extend in parallel along the light receiving device. LED array and a driving IC provided on the substrate in the vicinity of the LED array
And an image reading / writing device, wherein each of the above elements is housed in a main body case.