JP2004153490A - Image reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading apparatus capable of preventing deformation of a printed circuit board such as warpage due to a temperature rise and suppressing occurrence of a positional deviation of a CCD and defocusing. <P>SOLUTION: An end of a CCD 12 is provided with a plurality of leads 15 connected to the printed circuit board 13. Soldering ends 16 of the leads 15 projected from the printed circuit board 15 solder and fix the CCD 12 onto the printed circuit board 12. A spacer 14 is located between the CCD 12 and the printed circuit board 13 so as to avoid a gap from being generated between the CCD 12 and the printed circuit board 13. The spacer 14 is for fixing and supporting the printed circuit board 13 and is joined and fixed to the side of the printed circuit board 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading device using a CCD (charge coupled device) as a reading device, such as a digital copying machine, an image scanner, and a facsimile.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, digital copying machines, image scanners, facsimile machines, and the like use a digital reading device that reads a document image using a reading sensor. In this digital reading device, a CCD (Charge Coupled Device) is used as a reading sensor, and the density of a document image is converted into an electric signal level. In recent years, with the development of digital technology, digital copiers, image scanners, facsimile machines and the like have also realized higher speed and higher accuracy, and accordingly, the reading speed of the image reading unit in the image reading device has also been increased. It has been sped up.
[0003]
The scanning optical system moves the light source parallel to the document surface at a constant scanning speed, and scans the light reflected from the document surface to form an image on the CCD unit by the imaging lens. The original document is slit-irradiated by the light source, and the reflected light is reflected by the first mirror in parallel to the original surface, reflected in the opposite directions through the second and third mirrors orthogonal to each other, and is reflected on the CCD by the imaging lens. A device configured to form an image is generally employed.
[0004]
A CCD unit in a conventional image reading apparatus includes a CCD and a printed board for driving the CCD, and the CCD is soldered and fixed on the printed board. The printed circuit board to which the CCD is soldered is attached to a CCD unit fixing board (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-4-252656 (page 3, FIG. 4)
[0006]
[Problems to be solved by the invention]
However, as the reading speed of the image reading unit in the above-described image reading device increases, the amount of heat generated by the CCD used in the image reading device also tends to increase. The temperature of the soldered printed circuit board will also increase. Further, in the CCD unit of the conventional image reading apparatus, when the CCD is soldered to the printed board, a gap is generated between the CCD and the printed board. As a result, the printed circuit board is likely to be deformed such as warpage. As a result, there has been an inconvenience that a CCD position shift and a focus shift occur. In addition, when a gap is formed between the CCD and the printed circuit board during soldering, the parallelism between the CCD surface and the printed circuit board is deteriorated, resulting in a disadvantage that the working efficiency is reduced.
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an image reading apparatus which solves the above-mentioned problems, prevents deformation such as warpage of a printed circuit board due to a rise in temperature, and can suppress the occurrence of a position shift and a focus shift of a CCD. And
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a light emitting device which further includes a mirror that reflects light irradiated by a light source and reflected by a document, and further includes a light-emitting device provided to face a CCD soldered on a printed circuit board. In an image reading apparatus in which an image is made incident on a CCD via an image lens to form an image on the CCD, a spacer is provided between the CCD and the printed board for fixing and holding the printed board.
[0009]
According to this configuration, since the spacer for fixing and holding the printed circuit board is provided between the CCD and the printed circuit board, even if the temperature of the printed circuit board increases, the deformation of the printed circuit board is prevented beforehand. As a result, it is possible to avoid the position shift and the focus shift of the CCD. In addition, since the spacer is provided so that there is no gap between the CCD and the printed board, the parallelism between the CCD face and the printed board face can be easily taken when soldering, and the work efficiency can be improved. Can be improved.
[0010]
Further, the present invention is characterized in that the spacer is adhesively fixed on a printed circuit board. According to this configuration, since the spacer and the printed board are integrated, deformation of the printed board due to a rise in temperature can be further prevented.
[0011]
Further, the present invention is characterized in that the spacer is formed of a heat-resistant resin. According to this configuration, since the spacer having excellent heat resistance against the temperature rise is used, the deformation of the printed circuit board due to the temperature rise can be further prevented. Note that a configuration using a polycarbonate resin as the heat-resistant resin can also be used.
[0012]
In the present invention, the outer shape of the spacer is smaller than the outer shape of the CCD. According to this configuration, even when a spacer is inserted between the CCD and the printed circuit board, the CCD is soldered onto the printed circuit board without causing inconvenience such as disconnection of leads provided on the CCD and poor contact. , Can be fixed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating an overall configuration of an image reading apparatus according to an embodiment of the present invention. In an image reading apparatus having an optical system, a platen glass 2 is provided on an upper surface of an image reading apparatus main body 1, and a document 3 placed on the platen glass 2 is provided inside the image reading apparatus main body 1. A first optical system unit 6 including a light source 4 for illuminating the original by irradiating light, a first mirror 5 for reflecting the irradiation light reflected by the original 3 in the 90-degree direction, and a first mirror 5 A second optical system unit 9 including a second mirror 7 that reflects the reflected light in the 90-degree direction and a third mirror 8 that further reflects the light reflected by the second mirror 7 in the 90-degree direction is provided. .
[0014]
An image forming lens 10 and a CCD unit 11 on which a CCD 12 is mounted are provided inside the image reading apparatus main body 1, and light reflected from the document reflected by the third mirror 8 faces the CCD 12. The light is converged by the imaging lens 10 provided as described above, enters the CCD 12 via the imaging lens 10, and is imaged on the CCD 12.
[0015]
Here, in the above configuration, the imaging lens 10 and the CCD 12 are fixed to the image reading apparatus main body 1. However, even if the light source 4 moves, the light source 4 does not change. A first optical unit 6 composed of a first mirror 5 and a second optical unit 9 composed of a second mirror 7 and a third mirror 8 are provided so as to be movable at a constant speed. Have been.
[0016]
Next, a CCD unit of an image reading apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a side view illustrating a schematic configuration of a CCD unit of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a front view illustrating a schematic configuration of the CCD unit of the image reading apparatus according to the embodiment of the present invention. FIG. Here, as shown in FIG. 2, the CCD unit 11 includes a CCD 12, a printed circuit board 13, and a spacer.
[0017]
Further, as shown in FIG. 2, a plurality of leads 15 connected to the printed circuit board 13 are provided at an end of the CCD 12. The lead 15 is inserted into a hole (not shown) formed in the printed circuit board 13. By soldering an end 16 of the lead 15 protruding from the printed circuit board 13, the CCD 12 is placed on the printed circuit board 13. Is soldered and fixed. As shown in FIGS. 2 and 3, a printed circuit board 13 to which a CCD 12 is soldered is attached to a printed circuit board 13 on a CCD unit fixing board (not shown) provided in the image reading apparatus main body 1. A screw hole 18 in which a screw 17 for fixing is provided.
[0018]
A spacer 14 is provided between the CCD 12 and the printed board 13 so that no gap is formed between the CCD 12 and the printed board 13. The spacer 14 is for fixing and holding the printed board 13 and is bonded and fixed to the printed board 13 side. The spacer 14 is made of, for example, a resin having high heat resistance such as a polycarbonate resin.
[0019]
Therefore, in the embodiment of the present invention, since the spacer 14 having high heat resistance for fixing and holding the printed board 13 is provided between the CCD 12 and the printed board 13, the heat generated by the CCD 12 is increased. Even when the temperature of the printed circuit board 13 to which the CCD 12 is soldered rises, it is possible to prevent the printed circuit board 13 from being deformed, such as warping, as a result. And the inconvenience of defocusing can be avoided.
[0020]
In addition, since the spacers 14 are provided so as not to form a gap between the CCD 12 and the printed circuit board 13, the parallelism between the CCD surface and the printed circuit board surface can be easily obtained when soldering, thereby improving work efficiency. Can be done.
[0021]
Further, in the present embodiment, as shown in FIG. 3, the outer shape of the spacer 14 is smaller than the outer shape of the CCD 12, and particularly, in the end region of the CCD 12 where the leads 15 are formed, the spacer 14 The side 19 has a shape separated from the lead 15 by a predetermined distance α. By making the outer shape of the spacer 14 into such a shape, even when the spacer 14 is inserted between the CCD 12 and the printed board 13, when the lead 15 is soldered to the printed board 13, The CCD 12 can be soldered and fixed on the printed circuit board 13 without causing inconveniences such as disconnection or poor contact.
[0022]
2 and 3, the case where the plurality of leads 15 connected to the printed circuit board 13 are provided at the end of the CCD 12 has been described. However, as shown in FIGS. A configuration in which a plurality of leads 15 connected to the printed circuit board 13 are provided may be employed.
[0023]
When the lead 15 is provided at the center of the CCD 12, the printed circuit board 13 is easily curved. Therefore, compared to the case where the lead 15 is provided at the end of the CCD 12, deformation such as warpage of the printed circuit board 13 due to temperature rise is caused. Even in such a case, the spacer 20 having high heat resistance for fixing and holding the printed board 13 is provided between the CCD 12 and the printed board 13 even in such a case. Even if the temperature rises, it is possible to prevent the printed circuit board 13 from being deformed such as warpage beforehand, and as a result, it is possible to avoid the disadvantage that the CCD 12 is displaced and defocused. be able to.
[0024]
Also, when a plurality of leads 15 are provided in the center of the CCD 12, the outer shape of the spacer 20 is smaller than the outer shape of the CCD 12, as shown in FIG. In the central region, the side 21 of the spacer 20 has a shape separated from the lead 15 by a predetermined distance β. By forming the outer shape of the spacer 20 into such a shape, even when the spacer 20 is inserted between the CCD 12 and the printed board 13, the lead 15 is soldered to the printed board 13. The CCD 12 can be soldered and fixed on the printed circuit board 13 without causing inconveniences such as disconnection or poor contact.
[0025]
It should be noted that the present invention is not limited to the above-described embodiment, and it is possible to appropriately change the structure, shape, and the like of each part based on the gist of the present invention, and exclude them from the scope of the present invention. is not.
[0026]
For example, in the above embodiment, the spacer is formed of a resin having a high heat resistance, such as a polycarbonate resin. However, the spacer can prevent deformation of the printed board by holding and fixing the printed board. Glass or metal other than the above resin may be used as long as it can be prevented.
[0027]
In the above embodiment, the spacer is bonded and fixed to the printed circuit board. However, the spacer may be bonded and fixed to the CCD.
[0028]
【The invention's effect】
As described above, according to the present invention, since the spacer having high heat resistance for fixing and holding the printed board is provided between the CCD and the printed board, when the temperature of the printed board increases. Even if it does, the deformation of the printed circuit board can be prevented beforehand, and the occurrence of positional shift and defocus of the CCD connected to the printed circuit board can be avoided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating an overall configuration of an image reading apparatus according to an embodiment of the present invention.
FIG. 2 is a side view showing a schematic configuration of a CCD unit of the image reading apparatus according to the embodiment of the present invention.
FIG. 3 is a front view illustrating a schematic configuration of a CCD unit of the image reading apparatus according to the embodiment of the present invention.
FIG. 4 is a side view showing a schematic configuration of a CCD unit of an image reading apparatus according to another embodiment of the present invention.
FIG. 5 is a front view illustrating a schematic configuration of a CCD unit of an image reading apparatus according to another embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 image reading device main body 2 platen glass 4 light source 5 first mirror 7 second mirror 8 third mirror 10 imaging lens 11 CCD unit 12 CCD
13 Printed circuit board 14 Spacer 15 Lead 16 Lead end 20 Spacer

Claims (5)

The irradiation light irradiated by the light source and reflected by the original is further reflected by a mirror, and is incident on the CCD via an imaging lens provided facing the CCD soldered on a printed circuit board. An image reading apparatus for forming an image on a CCD, wherein a spacer for fixedly holding the printed board is provided between the CCD and the printed board. The image reading device according to claim 1, wherein the spacer is adhesively fixed to the printed circuit board. The image reading device according to claim 1, wherein the spacer is formed of a heat-resistant resin. The image reading device according to claim 3, wherein the heat-resistant resin is a polycarbonate resin. The image reading device according to claim 1, wherein an outer shape of the spacer is smaller than an outer shape of the CCD.

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