JP2003330125A - Image read carriage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the number of function constitution components of an image read carriage which switches reads of image information of the visible range and infrared range by the attachment and detachment of an infrared-ray cutting glass and to securely perform effective operation and positioning with less-component precision. <P>SOLUTION: This carriage has an optical filter which limits the absolute value of the quantity of light and a specified wavelength band, an optical filter base which holds the optical filter between an energizing part and a receiving surface part, a means of converting the kinetic momentum of a linear movement driving source into rotational motion by sliding on a portion of the optical filter base with a portion of a cam mechanism, an energizing means of trying to return the optical filter base to the original position, and three optical filter receiving projection parts positioned by optical adjustment on a pedestal where they are constituted together; when the driving of the driving source is not available, the optical filter floats slightly over the receiving surface part and can be positioned by being pressed against the three optical filter receiving projection parts by the optical filter energizing means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention irradiates a document with illumination light to form image information, reads the image information on the document with an image sensor, which is a photoelectric conversion means, and performs photoelectric conversion for conversion. The present invention relates to an image reading device that processes image signals to form image information.

[0002]

2. Description of the Related Art Today, various image reading devices such as an image canner for reading image information of a document to form digital image information have been put into practical use.

In recent years, in such an image reading apparatus, the image reading unit (carriage) itself becomes large, but the structure of the entire apparatus can be simplified, and the optical adjustment can be completed only within the unit. An image reading unit (carriage), which is an integrated optical system unit, is being widely used.

An example of an image reading apparatus for reading a document using the image reading unit (carriage) which is the integrated optical system unit will be described.

FIG. 9 shows a view seen from the upper side with the document pressure plate of the image reading apparatus removed, and a partial sectional view.

Since the platen glass 31 is transparent, the internal structure of the main frame 32 can be seen, and the left side frame 33 and the right side frame 34 are partially sectioned so that the overall shape of the carriage 1 can be confirmed.

The image reading unit (carriage) 1 having the photoelectric conversion means (image sensor) 21 opposed to the original P by the platen glass 31 outputs image information for one straight line (image information by main scanning for one line). In order to read the image information of the document P, the document P is read, and is moved in parallel in the sub-scanning direction (the direction of the arrow in the figure) from the front end to the rear end of the document P by a drive motor (not shown). .
As a result, a two-dimensional flat image of the original image can be read.

FIG. 3 shows an image reading unit (carriage).
1 shows a basic configuration diagram (a lamp and the like are omitted).

A lamp 22 serving as a light source, a reflecting mirror (reflecting shade) 23 on the back side of the lamp 22, and a reflecting mirror (reflecting shade) 24 near the lamp 22 linearly scan a required portion of the document P in the main scanning direction. To illuminate.

Here, the document table glass 31 on which the document P is set is not shown.

The light reflected by the image surface of the original P is formed into an optical image by the optical first mirror 25, the second mirror 26, the third mirror 27, the fourth mirror 28 and the fifth mirror 29. The image of the original is imaged on the image sensor 21 as a photoelectric conversion unit.

An infrared cut filter glass 2 is provided between the lens unit 30 and the image sensor 21 on the way.
Is rotatably provided at a position where it crosses the optical path and a position when it does not.

The image sensor 21 performs photoelectric conversion to create image information.

After processing one line of data,
The carriage 1 as an image reading unit is moved by one line in the sub-scanning direction to similarly create image information, and this is repeated.

These readings are divided into the case where there is visible light only and the case where there is infrared light, with or without being in the optical path of the infrared cut filter glass 2. These are used for detecting dust and scratches on the surface of the original P when the original P is a transparent film.

The light source lamp 22 in the main scanning direction
Therefore, the illuminance with respect to the document P may be non-uniform, or the pixels of the image sensor 21 may have different characteristics. Therefore, there is a large variation in creating the image information.

In order to carry out this correction, white and black shading corrections are required. The white reference plate for white shading and the black reference plate for black shading are arranged in the sub-scanning direction by the image reading unit (carriage) 1. They are provided at positions where they can be shaded on the extension and outside the original image reading range.

[0018]

However, as can be seen from the above, the optical adjustment of the image reading unit (carriage) is completed only within the unit.
A higher resolution image sensor can be used.

In order to make full use of the capabilities of the high resolution image sensor, the performance and dimensional accuracy of the lens unit, the folding mirror and the infrared cut filter glass, which are similarly important parts, are also high resolution images. What is appropriate for the sensor is required.

Therefore, unless the technical precision of the optical adjustment is set to a considerably high precision, there arises a problem that the capabilities of the high resolution image sensor and the high performance lens unit cannot be fully utilized.

Further, the accuracy of the parts relating to the optical adjustment causes a problem as described above, and therefore the number of the constituent parts should be small. In other words, if it is a functional component, it is desirable that one component can perform many functions.

[0022]

A light source unit, an optical image forming unit, and a photoelectric conversion unit are integrally included, a document is linearly illuminated by the light source unit, and an optical image is read in the main scanning direction of the photoelectric conversion unit. , In the image reading carriage that scans the entire image in the sub-scanning direction that is perpendicular to the main scanning direction and reads the image information of the document, read the image information in the visible region and the infrared region in the absolute value of the light amount or An optical filter that limits a specific wavelength band, an optical filter base that sandwiches the optical filter between an optical filter urging portion and an optical filter receiving surface portion, and an optical filter base that controls the momentum of a linear motion drive source by a part of a cam mechanism. Of the optical filter base and a biasing means for returning the optical filter base to its original position, and a pedestal that collectively constitutes these members are positioned for optical adjustment. It has three optical filter receiving protrusions, and the optical filter floats slightly above the filter receiving surface when the drive source is not driven, and the optical filter biasing portion can be pressed against the three optical filter receiving protrusions for positioning. I configured it like this.

Further, the light source means, the optical image forming means and the photoelectric conversion means are integrally included, the original is linearly illuminated by the light source means, an optical image is read in the main scanning direction of the photoelectric conversion means, and the main scanning direction is read. In the image scanning carriage that scans the entire image in the sub-scanning direction which is the direction perpendicular to the scanning direction, and reads the image information in the visible region and infrared region in the image reading carriage, the absolute value of the light amount or the specific wavelength band is read. An optical filter that limits the optical filter, an optical filter base that sandwiches the optical filter between the optical filter urging portion and the optical filter receiving surface portion, and the momentum of the linear motion drive source as part of the optical filter base at a part of the cam mechanism Means for converting the movement into sliding and rotation, and a biasing means for returning the cam mechanism to its original position,
A means for sliding the other part of the optical filter base by another part of the cam mechanism to rotate it to the original position, and an optical three-position optical position adjusted for optical adjustment on the pedestal that collectively constitutes these parts. It has a filter receiving protrusion, and the optical filter floats slightly from the filter receiving surface when the drive source is not driven, and the optical filter biasing portion can be pressed against three optical filter receiving protrusions for positioning. did.

Further, an image reading device is constructed by utilizing these image reading carriages.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Before explaining the embodiment, the adjustment of the image sensor 21 with respect to the carriage 1 will be briefly described again with reference to the basic configuration diagram of FIG.

It is considered that a straight line portion of the image information of the original P in the main scanning direction is focused on a straight line element of an image sensor which is a photoelectric conversion means.

The central optical path (optical axis) is shown by a one-dot chain line,
This optical path (optical axis) includes a first mirror 25, a second mirror 26,
The light is reflected by the third mirror 27, the fourth mirror 28, and the fifth mirror 29, is bent, and is guided to the lens unit 30 that forms an optical image.

Each of the optical mirrors 25 to 29 includes the carriage 1
It is fixed at a fixed position on the main body and does not require adjustment. The lens unit 30 is movable in the longitudinal direction with respect to the optical path (optical axis) for magnification adjustment and the like.

The infrared cut filter glass 2 is provided so as to be rotatable when it crosses the optical path and when it does not. When the infrared cut filter glass 2 traverses the optical path, the infrared cut filter glass 2 is attached to the carriage 1.
The body is positioned at a fixed position, that is, the lens unit 30 is also fixed at a fixed position.

As a result, the image sensor 21 needs five degrees of freedom of adjustment movement with respect to the carriage 1.
It is understood that if these five degrees of freedom are ensured, optical adjustment is possible (X-S, Y-R, Y-S, Z-R, Z in the figure).
-S).

The configuration, shape, adjustment and operation of this embodiment will be described.

FIG. 4 shows an enlarged sectional view of the carriage. The configuration is the same as that described with reference to the basic configuration diagram of FIG. 3, and the configuration of the infrared cut filter rotating unit 3 can be understood. The figure shows the case where the infrared cut filter glass 2 crosses the optical path, and a diagram of the unit portion when the infrared cut filter glass 2 does not cross the optical path is shown in the lower part.

FIG. 5 shows a lower front view of the carriage enlarged sectional view of FIG. 4 as seen from below.

As can be seen from the figure, the optical adjustment of this embodiment is performed by turning the carriage 1 upside down, and after the optical adjustment and the adjustment movement of the image sensor 21, the assembly is completed by the adhering step.

In the carriage 1, an infrared cut filter rotation unit 3 is provided between the lens unit 30 and the image sensor 21.

FIG. 6 is a front view of the lower portion of the carriage shown in FIG.
Sectional view, ie, infrared cut filter rotation unit 3
A part viewed from the lens unit 30 side is shown, and is a partial cross-sectional view for easy understanding.

FIG. 1 and FIG. 2 are views of the infrared cut filter rotating unit 3, which respectively show the case where the infrared cut filter glass 2 crosses the optical path (0 °) and the case where it does not cross the optical path (90 °). ) Is shown.

The solenoid 4 which is the drive source of this unit, and the solenoid 4 is turned on / off to turn on / off the solenoid 4.
The cam 6 integrated with the core core 5 of FIG. The cam 6 has a spiral portion 7, and an escape prevention portion 8 for the cam 6 is provided on the unit pedestal 9 so that the cam 6 does not shift during movement.

The end of the rotary shaft 11 of the filter glass base 10 that supports the infrared cut filter glass 2 is placed by the stopper portion 12 of the unit pedestal 9 with almost no play in the direction of the rotary shaft 11.

The spiral portion 7 of the cam 6 slides in contact with the arm-shaped portion 13 of the filter glass base 10, and when the solenoid 4 is ON, that is, when the cam 6 moves to the solenoid 4 side, the arm-shaped portion 13 is Sliding on the spiral part 7,
The filter glass stand 10 will rotate.

When the solenoid 4 is OFF, the filter glass base 10 is pressed against the unit pedestal 9 by the urging force of the filter glass base return spring 14. Also, the arm shape part 1
3 presses the spiral part 7 so that the cam 6 moves in the direction of being separated from the solenoid 4 and the core 5
Along with returning to the original position.

That is, a cam mechanism that causes a rotary motion from a linear motion is used.

Here, the filter glass base 10 will be described in more detail. Infrared cut filter glass 2
Is the two glass urging members 15 of the filter glass base 10.
And the glass receiving surface (chain line portion) in contact with the opposing surface of the infrared cut filter glass 2.

Each of the two glass urging members 15 has a projection 16 at the tip thereof and is in contact with the infrared cut filter glass 2. On the other hand, the unit pedestal 9 has an opening 17 so as not to obstruct the optical path, and has three glass receiving protrusions 18 near the opening 17 for positioning the infrared cut filter glass 2.

When the infrared cut filter glass 2 does not cross the optical path (90 °), the infrared cut filter glass 2 should be supported by the two glass urging member protrusions 16 and the glass receiving surface (chain line). I understand.

When the infrared cut filter glass 2 crosses the optical path (0 °), the infrared cut filter glass 2
Is slightly supported by the two glass urging member projecting portions 16 and the three glass receiving projecting portions 18 so that the dimensional positional relationship between the three glass receiving projecting portions 18 and the glass receiving surface (chain line portion) is slightly shifted. ing. As a result, the infrared cut filter glass 2 is pressed against the three glass receiving projections 18 by the urging of the two glass urging member projections 16, is supported at three points, and is easily positioned.

Therefore, it is only these three glass receiving projections 18 that the dimensions must be highly accurate among the components related to the infrared cut filter rotation unit 3.

Further, the unit can be assembled and the number of parts in the unit can be reduced.

(Second Embodiment) FIGS. 7 and 8 are views of the infrared cut filter rotating unit 3, in which the infrared cut filter glass 2 crosses the optical path (0
(°) and the case where it does not cross the optical path (90 °).

The solenoid 4 which is the drive source of this unit, and the solenoid 4 is turned on / off by turning on / off the solenoid 4.
The cam 6 integrated with the core core 5 of FIG. The cam 6 has an outer spiral portion 7 and an inner spiral portion 20, and an escape prevention portion 8 of the cam 6 is provided on a unit pedestal 9 so that the cam 6 does not shift during movement.

The end of the rotary shaft 11 of the filter glass base 10 which supports the infrared cut filter glass 2 is placed by the stopper portion 12 of the unit pedestal 9 with almost no play in the direction of the rotary shaft 11.

The outer spiral portion 7 of the cam 6 is slidably engaged with the arm-shaped portion 13 of the filter glass base 10, and when the solenoid 4 is ON, that is, when the cam 6 moves to the solenoid 4 side, the arm-shaped portion 13 is formed. Slides on the spiral portion 7, and the filter glass base 10 rotates.

When the solenoid 4 is off, the urging force of the core return spring 14 causes the cam 6 to move in a direction away from the solenoid 4, and returns to the original position together with the core 5.

At this time, the inner spiral portion 20 of the cam 4 is
However, while sliding while pushing the sliding engagement portion 19 of the filter glass base 10, the filter glass base 10 is pressed against the unit pedestal 9.

This also utilizes a cam mechanism that causes a rotational movement from a linear movement.

Here, the filter glass base 10 will be described in more detail. Infrared cut filter glass 2
Is the two glass urging members 15 of the filter glass base 10.
And the glass receiving surface (chain line portion) in contact with the opposing surface of the infrared cut filter glass 2.

Each of the two glass urging members 15 has a projection 16 at the tip thereof and is in contact with the infrared cut filter glass 2. On the other hand, the unit pedestal 9 has an opening 17 so as not to obstruct the optical path, and has three glass receiving protrusions 18 near the opening 17 for positioning the infrared cut filter glass 2.

When the infrared cut filter glass 2 does not cross the optical path (90 °), the infrared cut filter glass 2 should be supported by the two glass urging member projections 16 and the glass receiving surface (chain line). I understand.

When the infrared cut filter glass 2 crosses the optical path (0 °), the infrared cut filter glass 2
Is slightly supported by the two glass urging member projecting portions 16 and the three glass receiving projecting portions 18 so that the dimensional positional relationship between the three glass receiving projecting portions 18 and the glass receiving surface (chain line portion) is slightly shifted. ing. As a result, the infrared cut filter glass 2 is pressed against the three glass receiving projections 18 by the urging of the two glass urging member projections 16, is supported at three points, and is easily positioned.

Therefore, it is only these three glass receiving projections 18 that the dimensions of the components related to the infrared cut filter rotating unit 3 must be highly accurate.

Further, the unit is assembled and the number of parts in the unit can be reduced, which is the same as the first embodiment.

[0063]

As described above, according to the present invention, the assembling property of the optical adjustment work of the carriage which is the image reading unit of the integrated optical system is improved, and the high precision part of the parts relating to the optical adjustment is improved. It is possible to reduce the number of components and the number of constituent parts, which improves efficiency.

[Brief description of drawings]

FIG. 1 shows a case where a filter glass according to a first embodiment crosses an optical path.

FIG. 2 shows a case where the filter glass according to the first embodiment does not cross the optical path.

FIG. 3 is a basic configuration diagram of an image reading unit (carriage).

FIG. 4 is an enlarged sectional view of an image reading unit (carriage).

FIG. 5 is a lower front view of the enlarged carriage sectional view seen from below.

FIG. 6 is a cross-sectional view taken along the line XX of the front view of the bottom of the carriage.

FIG. 7 shows a case where the filter glass of the second embodiment crosses the optical path.

FIG. 8 shows a case where the filter glass of the second embodiment does not cross the optical path.

9A and 9B are a top view and a partial cross-sectional view of the image reading device.

[Explanation of symbols]

1 carriage 2 Infrared cut filter glass 3 Infrared cut filter rotation unit 4 solenoid 5 core core 6 cams 7 spiral part (outside) 8 escape prevention section 9 unit pedestal 10 Filter glass stand 11 rotation axis 12 Stopper part 13 Arm shape part 14 Return spring 15 Glass biasing member 16 Protrusion 17 openings 18 Glass receiving protrusion 19 Inner spiral 20 Sliding engagement part 21 image sensor 22 lamps 23 Reflection mirror (reflection shade) 24 Reflection mirror (reflection shade) 25 First Mirror 26 Second mirror 27 Third Mirror 28 Fourth mirror 29 Fifth Mirror 30 lens unit 31 Platen glass 32 mainframe 33 Left side frame 34 Right side frame

Claims (2)

[Claims] 1. A light source means, an optical image forming means, and a photoelectric conversion means are integrally included, a document is linearly illuminated by the light source means, and an optical image is read in a main scanning direction of the photoelectric conversion means. An image reading carriage that scans the entire document in the sub-scanning direction, which is the direction perpendicular to the scanning direction, and reads the image information of the document, reads the image information in the visible region and infrared region by the absolute value of the light amount or a specific wavelength. An optical filter that limits the band, an optical filter base that sandwiches the optical filter between an optical filter urging portion and an optical filter receiving surface portion, and the optical filter base that controls the momentum of a linear motion drive source by a part of a cam mechanism. Of the optical filter base, a biasing means for returning the optical filter base to its original position, and a position for optical adjustment on a pedestal that collectively includes these means. The optical filter receiving projections at three points, the optical filter floats slightly above the filter receiving surface portion when the drive source is not driven, and the optical filter biasing portion causes the optical filter at the three points. An image reading carriage, which is configured so that it can be pressed against a receiving projection to be positioned. 2. A light source means, an optical image forming means, and a photoelectric conversion means are integrally included, the original is linearly illuminated by the light source means, and an optical image is read in a main scanning direction of the photoelectric conversion means. The image scanning carriage that scans the entire document in the sub-scanning direction, which is the direction perpendicular to the scanning direction, reads the image information of the original. An optical filter that limits the band, an optical filter base that sandwiches the optical filter between an optical filter urging portion and an optical filter receiving surface portion, and the optical filter base that controls the momentum of a linear motion drive source by a part of a cam mechanism. Of the optical filter base by means of another part of the cam mechanism and a biasing means for returning the cam mechanism to its original position. One And a means for sliding it back to its original position and a pedestal that collectively comprises these and has three optical filter receiving protrusions positioned for optical adjustment, and when there is no drive of the drive source, An image reading carriage, characterized in that the optical filter is slightly floated from the filter receiving surface portion, and the optical filter urging portion can press and position the optical filter receiving protrusions at the three points.