JPH04170846A - Fitting structure for optical line sensor - Google Patents

Abstract

PURPOSE:To always obtain the high definition read picture of good quality without deteriorating picture quality through simple and inexpensive configuration by providing a first adjusting means to support an optical line sensor movably in the direction of Z-axis, a second adjusting means to support it rotatably around Z-axis, and a third adjusting means to support it rotatably around Y- axis. CONSTITUTION:The first supporting means to support the optical line sensor 7 movably in the direction of Z-axis is constituted of micrometer heads 9, 10, and besides, the third adjusting means to support the optical line sensor 7 rotatably around Y-axis is constituted of the micrometer head 10 (9). Further, the second adjusting means to support the optical line sensor 7 rotatably around Z-axis is constituted of the micrometer head 11. Accordingly, the fine adjustment of the position and the posture of the optical line sensor 7 can be executed by the micrometer heads 9 to 11. Thus, the good high definition read picture can be always obtained without being accompanied with the deterioration of the picture quality through the simple and inexpensive configuration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the installation of the optical line sensor of an image reading device that forms an image of a document on an optical line sensor (for example, a CCD) and reads the formed image. It's about structure.

[Prior art]

Conventionally, in this type of image reading device, light from a light source is irradiated onto a document on a document table, and then incident on an optical line sensor through an imaging lens to form an image of the document on the optical line sensor. , read (photoelectrically convert) the optical line sensor in the main scanning direction (X axis) perpendicular to the optical axis direction (two axes), and move the document table in the main scanning direction of the optical line sensor. Orthogonal sub-scanning direction (Y
The device is configured to read the entire image of the document by mechanically moving it along the axis (axis).

[Problem to be solved by the invention]

By the way, in the above-mentioned image reading device, the positioning and assembly accuracy of the light source, document table, projection optical system, optical line sensor, etc. has traditionally been within the range of machining accuracy of each component that supports them. is determined, and thus the detection accuracy is determined.

Therefore, if the processing accuracy includes errors in advance, for example, the image may not be in focus, or the reading area of the original image or the actual scanning area may be out of alignment.

This causes a problem that the input image read by the optical line sensor is degraded.

In order to solve the above-mentioned problems, providing each element with a fine adjustment mechanism that can make translational and rotational adjustments in all directions increases costs and complicates the mechanism.

It is also conceivable to process the image data read by the optical line sensor using software and correct it to regular image data (data correction means).

If the data read by the above-mentioned optical line sensor has a rotational deviation around the optical axis with respect to the normal image, data interpolation is required in the rotation calculation of the digital image sampled at 1M intervals. This results in deterioration of the two images.

Therefore, one object of the present invention is to always obtain high-quality and good read images without image deterioration with a simple and inexpensive configuration by providing only the minimum mechanical adjustment function. An object of the present invention is to provide a mounting structure for the above-mentioned optical line sensor of an image reading device.

[Means to solve the problem]

In order to achieve the above object, the main means adopted by the present invention is to irradiate light from a light source onto a document on a document table and then make it enter an optical line sensor through an imaging lens. The image of the document is formed on the line sensor and read in the main scanning direction (X wheel) of the optical line sensor perpendicular to the optical axis direction (Z axis), and the image data read by the optical line sensor in the X-axis direction and/or the X-axis, Z
In the mounting structure for the optical line sensor of an image reading device comprising data correction means for correcting deviation in a direction perpendicular to the axis (Y-axis), the optical line sensor is used as a positioning means for the optical line sensor. a first adjustment means that supports the optical line sensor so as to be movable in the direction of the Z-axis; a second adjustment means that supports the optical line sensor so as to be rotatable around the Z-axis; This is an optical line sensor mounting structure comprising only a third adjusting means that is rotatably supported around the optical line sensor.

[Effect]

In the mounting structure of the optical line sensor according to the present invention,
For image data processing that does not involve data deterioration, image data is corrected using a software data correction means. , 1st. Second. Image data is corrected by adjusting each third mechanical adjustment means.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Three embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. still.

The following example is an example embodying the present invention.

It is not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a schematic configuration diagram of main parts of an image reading device according to an embodiment of the present invention, and FIGS. 2(a), (b), (C
) are explanatory diagrams for adjusting the position of the optical line sensor in the image reading device, and FIG. This is a chart showing the relationship between

In the image reading apparatus 1 equipped with the optical line sensor mounting structure according to this embodiment, as shown in FIG.
．． An imaging lens 6 and an optical line sensor (CCD) 7 are arranged in that order, and the light source 3. Moving mechanism 4. Manuscript table 5. The positioning and assembly accuracy of the imaging lens 6 and the like is determined within the range of processing accuracy during machining of each component that supports them.

The light from the light source 3 is irradiated onto a document (not shown) on the document table 5 and then enters the optical line sensor 7 through the imaging lens 6, and an image of the document is formed on the optical line sensor 7. The image is imaged and read in the main scanning direction (Y-axis) of the optical line sensor 7 perpendicular to the optical axis 8 direction (Z-axis). Then, the document table 5 is moved by the moving mechanism 4 in the sub-scanning direction (Y-axis) perpendicular to the main-scanning direction and the Z-axis, and the entire image of the document is read.

Here, in the two embodiments, the micrometer head 9,
10.11, the structure is such that the mechanical position and posture of the optical line sensor 7 can be finely adjusted. The above-mentioned micrometer head is a spindle used in a so-called micrometer for measuring minute distances.
It is a position adjustment mechanism composed of a sleeve, vernier, simple, etc.

The micrometer head 9.10 constitutes a first adjustment means that supports the optical line sensor 7 so as to be movable in the direction of the Z-axis.

That is, by rotating the micrometer heads 9 and 10 by the same amount and in the same direction, the optical line sensor 7 is adjusted in translation in the direction of the Z-axis.

By the micrometer head 10 (9).

A third adjusting means is configured to support the optical line sensor 7 rotatably around the Y axis.

That is, by rotating and adjusting only the micrometer head 10 (9) with the micrometer head 9 (10) fixed, the optical line sensor 7 can be adjusted to the Y position.
The rotation is adjusted around the axis.

The micrometer rod 11 constitutes a second adjusting means that supports the optical line sensor 7 rotatably around the Z axis. That is.

By rotating and adjusting the micrometer head 11, the optical line sensor 7 can be moved to the Z Z centering on the supporting position of the RAD 9 with respect to the base 2.
The rotation is adjusted around the axis.

Therefore, in the image reading device 1, the real image 12 of the original image is optically distorted due to, for example, variations in the focal length of the imaging lens 6, misalignment in the direction of the optical axis 8, and misalignment of the document table 5 in the direction of the optical axis 8. When the image is not formed on the line sensor 7 (see FIG. 2(a)).

By adjusting the rotation of the micrometer heads 9 and 10 by the same amount and in the same direction to align the imaging position of the real image 12 on the optical line sensor 7, a read image in focus can be obtained.

Further, when the imaging lens 6 undergoes a rotational shift around the Y axis, the real image 12 of the original image is distorted by the imaging lens 6 due to the stirring effect.
(see FIG. 2(b)), but by rotating the micrometer heads 9 and 10 by the same amount in opposite directions, the real image 12 can be rotated around the Y-axis by the optical line sensor. 7, and a well-focused read image can be obtained.

Further, if the document table 5 is rotated around the optical axis 8 (see FIG. 2(C)), the field of view of the optical line sensor 7 is tilted with respect to the area to be read. Although it is possible to restore this image by performing rotation processing after converting it into a digital image, data interpolation is required in rotation processing of a discretely sampled digital image, resulting in image deterioration. . Therefore, in the apparatus of this embodiment, by rotating and adjusting the micrometer head 11, it is possible to align the field of view of the optical line sensor 7 with the document table 5.

On the other hand, deviation phenomena other than those described above include rotational deviation of the document table 5 around the X axis, translational deviation in the x and Y axis directions,
Rotational deviation around the optical axis 8 and the X axis of the imaging lens 6,
, translational deviation in the Y-axis direction, rotational deviation of the optical line sensor 7 around the X-axis, and Y-axis.

Translational deviation in the Y-axis direction does not have a harmful effect on image reading, or does not cause image deterioration after the data is processed into a digital image after image reading by the optical line sensor 7. Since this can be handled by processing only parallel movement of data, there is no need for mechanical fine adjustment as described above.

FIG. 3 shows the translational deviation and two-rotation deviation in each of the above-mentioned elements, and the position adjustment procedure according to each positional deviation situation.

That is, in the apparatus of the second embodiment, if there is no data deterioration when processing one image data, software correction of the image data is performed, and in other cases, the micrometer heads 9, 10, and 11 are adjusted as appropriate. Correction of one image data is performed by mechanical adjustment.

Therefore, by providing only the minimum mechanical fine adjustment function, it is possible to always obtain high quality and good read images without image deterioration with a simple and inexpensive configuration.

In the structure of this embodiment, a mechanism similar to the micrometer head 11 is disposed above the optical line sensor 7 in parallel to the micrometer head 11.
By finely adjusting the rotation in the direction opposite to that of the micrometer head 11, the rotational function of the optical line sensor 7 about the Y axis can be further enhanced.

〔Effect of the invention〕

As described above, in the present invention, light from a light source is irradiated onto a document on a document table, and then incident on an optical line sensor through an imaging lens to form an image of the document on the optical line sensor. While reading in the horizontal scanning direction (Y axis) of the optical line sensor perpendicular to the axial direction (Zm),
An image reading device comprising a data correction means for correcting a deviation of image data read by the optical line sensor in the X-axis direction and/or in the Y-axis and a direction perpendicular to the Y-axis (Y-axis). In the mounting structure of the above-mentioned optical line sensor of the device, the above-mentioned optical line sensor! As determining means, a first adjustment means that supports the optical line sensor so as to be movable in the direction of the Y-axis, and a second adjustment means that supports the optical line sensor so as to be rotatable around the Y-axis. .

Since this optical line sensor mounting structure is characterized in that it includes only a third adjustment means that rotatably supports the optical line sensor around the Y axis, minimal mechanical fine adjustment is required. By providing only these functions, it is possible to always obtain high-quality and good read images without image deterioration with an m-sized and inexpensive configuration.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of the main parts of an image reading device according to an embodiment of the present invention, and FIGS. FIG. 3 is a chart showing the relationship between the state of misalignment of each element constituting the image reading device and the adjustment to be made for this misalignment. [Explanation of symbols] l... Image reading device 2... Base 3... Light source 4... Moving mechanism 5... Document table 6... Imaging lens 7... Optical line sensor 8 ···optical axis

Claims (1)

[Scope of Claims] 1. Light from a light source is irradiated onto the document on the document table, and then incident on an optical line sensor through an imaging lens, and an image of the document is formed on the optical line sensor to align the optical axis. reading in the main scanning direction (X-axis) of the optical line sensor perpendicular to the direction (Z-axis), and a deviation of the image data read by the optical line sensor in the X-axis direction and/or the X-axis; In the mounting structure for the optical line sensor of an image reading device comprising data correction means for correcting deviation in a direction perpendicular to the Z-axis (Y-axis), the optical line sensor serves as a positioning means for the optical line sensor. a first adjusting means for supporting the optical line sensor so as to be movable in the direction of the Z axis; a second adjusting means for supporting the optical line sensor so as to be rotatable around the Z axis; A mounting structure for an optical line sensor, comprising only a third adjustment means that is rotatably supported around an axis.