JP2010154413A - Image sensor unit, and, image reading apparatus employing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image sensor unit in which positioning accuracy is improved by eliminating the influences of error in the step of manufacturing a sensor substrate and a mount alignment mark by positioning a rod lens array and a photoelectric transducer by means of a positioning member mounted by a mounting means for the same coordinate system as the photoelectric transducer. <P>SOLUTION: In a sensor substrate 7 on which a plurality of photoelectric transducers 6<SB>k</SB>are mounted to be arrayed, and a frame 8 holding the sensor substrate 7, the sensor substrate 7 comprises a positioning member 9 which is continuously mounted by a mounting means of the same coordinate system when mounting the photoelectric transducers 6<SB>k</SB>, and the frame 8 comprises a groove 10. The sensor substrate 7 is positioned by the positioning member 9 and the groove 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a contact image sensor unit and an image reading apparatus using the contact image sensor unit.

Conventionally, an image sensor unit is used as an image reading apparatus used for a facsimile, a copying machine, a scanner, or the like.
That is, as shown in FIG. 8, in Patent Document 1, a mounting substrate 21 on which an image sensor 20 is mounted, a converging means 22 for converging reflected light from a document onto the sensor element of the image sensor 20, and a mounting substrate 21. And a converging means 22 or a mounting frame 23 to be mounted has been proposed.

JP-A-4-314255

By the way, in the above-mentioned contact image sensor unit, the lens array 22 is abutted and fixed to one surface of the mounting frame 23, and the center of the lens array 22 and the first hole 24 formed in the second hole 25 or the mounting substrate 21. The predetermined distance B is ensured from the protrusion 26 fitted to the.
Further, the first hole 24 is formed in the mounting substrate 21 on which the image sensor 20 is mounted, and the center of the photodiode provided in the image sensor 20 and the second hole 25 formed in the mounting frame 23 or the first hole. In this configuration, a predetermined distance A is ensured from the protrusion 26 fitted to 24.
With this configuration, the lens array 22 and the image sensor 20 are positioned by making A and B coincide with each other.

  In general, the image sensor 20 is mounted using a mounting alignment mark or the like formed on the mounting substrate 21 with a conductor pattern or the like as a reference position. The mounting alignment mark is formed on the mounting substrate 21. The first hole 24 is used as a reference position.

  However, the first hole 24 serving as a reference position for forming the mounting alignment mark has a problem that an error or the like in the manufacturing process occurs when the first hole 24 is formed in the mounting substrate 21. In addition, there is a problem that an error in the manufacturing process occurs when the alignment mark for mounting is formed. For this reason, when the mounting alignment mark is formed with the first hole 24 as a reference position, there is an error that occurs when the first hole 24 is formed, and an error that occurs when the mounting alignment mark is formed. In addition, an error of the mounting apparatus generated when the image sensor 20 is mounted on the mounting alignment mark is added, and there is a possibility that sufficient positioning accuracy cannot be ensured.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an image sensor unit in which the positioning accuracy between the rod lens array and the photoelectric conversion element is improved, and an image reading apparatus using the image sensor unit.

  The image sensor unit according to claim 1, wherein a sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted, a light source for document illumination, a rod lens array that forms an image of reflected light from the document on the sensor substrate, In the image sensor unit constituted by a frame for holding these, the frame has a groove portion, and the sensor substrate has a positioning member that is continuously mounted by mounting means of the same coordinate system when the photoelectric conversion element is mounted. And the sensor substrate is positioned by the groove and the positioning member.

  The image sensor unit according to claim 2, a sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted, a light source for document illumination, a rod lens array that images reflected light from a document on the sensor substrate, In the image sensor unit constituted by a frame for holding them, the frame has a groove portion, and the sensor substrate is positioned by the photoelectric conversion elements positioned at both ends of the groove and the photoelectric conversion elements mounted in an array. It is characterized by being.

  The image reading apparatus according to claim 3, wherein a sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted, a light source for document illumination, a rod lens array that forms an image of reflected light from the document on the sensor substrate, In the image reading apparatus using the image sensor unit composed of a frame for holding these, the frame has a groove portion, and the sensor substrate is continuously mounted by mounting means of the same coordinate system when the photoelectric conversion element is mounted. It has a positioning member to be mounted, and the sensor substrate is positioned by the groove and the positioning member.

  The image reading apparatus according to claim 4, wherein a sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted, a light source for document illumination, a rod lens array that forms an image of reflected light from the document on the sensor substrate, In the image reading apparatus using the image sensor unit composed of a frame for holding them, the frame has a groove portion, and the sensor substrate is positioned at both ends of the photoelectric conversion element mounted in alignment with the groove portion. It is characterized by being positioned by a photoelectric conversion element.

As described above, by positioning the rod lens array and the photoelectric conversion element with the positioning member mounted by the mounting means having the same coordinate system as the photoelectric conversion element, the sensor substrate and the mounting alignment mark The influence of errors in the manufacturing process can be eliminated, and positioning accuracy can be improved.
In addition, positioning of the rod lens array and the photoelectric conversion element is performed by the photoelectric conversion elements located at both ends of the photoelectric conversion element, thereby eliminating the influence of errors in the manufacturing process of the sensor substrate and the mounting alignment mark. , Positioning accuracy can be improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing the structure of a scanner (image reading apparatus) to which the present invention can be applied.
An image sensor unit 2 is stored in the housing 1 as a photoelectric conversion device. The image sensor unit 2 is, for example, a contact image sensor (CIS) unit. The housing 1 is also provided with a signal processing unit (not shown) that processes signals output from the image sensor unit 2.

FIG. 2 is a diagram showing the structure of the image sensor unit 2.
The image sensor unit 2 includes a light source 3 composed of LEDs or the like, a light guide 4 that guides light from the light source 3 to a document (not shown), and a rod in which a plurality of erecting equal-magnification imaging lens elements are arranged. A lens array 5 is provided. Furthermore, a photoelectric conversion element 6 _k (k is a natural number from 1 to 8) for converting light emitted from the rod lens array 5 into an electric signal, and a sensor substrate 7 on which the photoelectric conversion element 6 _k is mounted are provided. .
In the present embodiment, the number of photoelectric conversion elements is eight, but the number of photoelectric conversion elements is not particularly limited.
Reference numeral 8 denotes a frame in which a sensor substrate 7 on which the light source 3, the light guide 4, the rod lens array 5, and the photoelectric conversion element _6k are mounted is attached.

In the image sensor unit 2 configured as described above, the light emitted from the light source 3 is guided to the document by the light guide 4. Then, the reflected light from the original is focused on the photoelectric conversion element 6 _k by the rod lens array 5. Thereafter, the reflected light is converted into an electric signal by the photoelectric conversion element 6 _k , and this electric signal is processed by a signal processing unit (not shown) via the sensor substrate 7. In this way, the original is read.
At this time, if the photoelectric conversion element 6 _k is not mounted at the center position of the rod lens array 5, it adversely affects the reading of the document, such as a reduction in the amount of light and deterioration of the image.

Next, the relationship between the sensor substrate 7 and the frame 8 will be described. 3 is a top view showing the structure of the sensor substrate 7 to which the present invention can be applied, and FIGS. 4 and 5 are a side view showing the structure of the image sensor unit 2 and a cross-sectional view taken along line AA. .
The planar shape of the sensor substrate 7 is an elongated rectangle, and circuit patterns are formed on both sides (or multiple layers).
On the sensor substrate 7, photoelectric conversion elements _6k are arranged at regular intervals, and the direction of this arrangement is the main scanning direction of the image reading apparatus.

Reference numeral 9 denotes a positioning member mounted on both ends of the photoelectric conversion element 6 _k . The positioning member 9 is a mounting device having the same coordinate system when the photoelectric conversion element 6 _k is mounted with a mounting alignment mark or the like (not shown) as a reference position. These are mounted on the sensor substrate 7 continuously during die bonding by the die bonder. The photoelectric conversion element 6 _k and the positioning member 9 are bonded on the sensor substrate 7 with a thermosetting adhesive (not shown).
Reference numeral 10 denotes a groove provided at both ends of the frame 8, and the groove 10 is configured to be fitted to the positioning member 9.

With this configuration, the groove portion 10 provided in the frame 8 and the positioning member 9 mounted on the sensor substrate 7 are fitted to each other, so that the center position in the lens width direction of the rod lens array 5 and the photoelectric conversion element 6 _k are aligned. Positioning with the light receiving unit is performed.

In the present embodiment, since the positioning member 9 can be mounted continuously with the photoelectric conversion element 6 _k using a high-accuracy mounting apparatus (die bonder), the positioning member 9 as the attachment reference position and the photoelectric conversion element 6 _k are provided. Can be mounted with the same accuracy. For this reason, positioning by the groove 10 provided in the frame 8 can be performed with the same accuracy as the photoelectric conversion element 6 _k , and the influence of errors in the manufacturing process of the sensor substrate and the mounting alignment mark can be eliminated. lens arrays 5 and the positioning of the photoelectric conversion element 6 _k performed with high accuracy. Since the positioning accuracy by the die bonder is ± 0.05 mm or less, even if different members of the photoelectric conversion element 6 _k and the positioning member 9 are mounted at the same time, from the conventional positioning intersection of about ± 0.5 mm to about ± 0.1 mm Can be improved.
Further, since the positioning member 9 is continuously mounted when the photoelectric conversion element 6 _k is mounted, there is no significant increase in the number of man-hours and the influence on the cost is small.

The positioning member 9 may have any shape as long as die bonding using a die bonder such as width, length, and height is possible. For example, a photoelectric conversion element may be used as a dummy sensor (see FIG. 6). Moreover, you may divert other electrical components.
The mounting position of the positioning member 9 may be any position as long as die bonding by a die bonder is possible (see FIG. 7).

  The contact image sensor unit of the present invention is a technique effective as an image reading apparatus such as an image scanner, a facsimile machine, and a copying machine.

FIG. 1 is a diagram showing the structure of an image scanner to which the present invention can be applied. FIG. 2 is a diagram showing the image sensor unit 2. FIG. 3 is a top view showing the structure of the sensor substrate 7. FIG. 4 is a side view showing the image sensor unit 2. FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a top view showing the structure of another sensor substrate 7. FIG. 7 is a top view showing the structure of another sensor substrate 7. FIG. 8 is a diagram showing a contact image sensor unit described in Patent Document 1. As shown in FIG.

Explanation of symbols

5: Rod lens array 6: Photoelectric conversion element 7: Sensor substrate 8: Frame 9: Positioning member 10: Groove

Claims (4)

A sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted;
A light source for document illumination;
A rod lens array that images reflected light from a document on the sensor substrate;
In the image sensor unit composed of a frame that holds these,
The frame has a groove,
The sensor substrate has a positioning member that is continuously mounted by mounting means of the same coordinate system when the photoelectric conversion element is mounted;
The image sensor unit, wherein the sensor substrate is positioned by the groove and the positioning member. A sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted;
A light source for document illumination;
A rod lens array that images reflected light from a document on the sensor substrate;
In the image sensor unit composed of a frame that holds these,
The frame has a groove,
The image sensor unit, wherein the sensor substrate is positioned by photoelectric conversion elements positioned at both ends of the photoelectric conversion elements that are continuously mounted by mounting means having the same coordinate system as the groove. A sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted;
A light source for document illumination;
A rod lens array that images reflected light from a document on the sensor substrate;
In an image reading apparatus using an image sensor unit composed of a frame for holding these,
The frame has a groove,
The sensor substrate has a positioning member that is continuously mounted by mounting means of the same coordinate system when the photoelectric conversion element is mounted;
The image reading apparatus, wherein the sensor substrate is positioned by the groove and the positioning member. A sensor substrate on which a plurality of photoelectric conversion elements are arranged and mounted;
A light source for document illumination;
A rod lens array that images reflected light from a document on the sensor substrate;
In an image reading apparatus using an image sensor unit composed of a frame for holding these,
The frame has a groove,
The image reading apparatus, wherein the sensor substrate is positioned by photoelectric conversion elements positioned at both ends of the photoelectric conversion elements that are continuously mounted by mounting means having the same coordinate system as the groove.

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