JPH09163086A - Method and device for adjusting position of image forming lens and document reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the position of an image forming lens with a high precision. SOLUTION: Pinholes 22 and 23 where small holes 22a, 22b, 23a, and 23b are formed are positioned by pins 26a to 26c and 27a to 27c and are arranged in both end parts of a base 3 of a document reader 1 to arrange a position adjustment device 20, and laser light sources 21a and 21b and an observation plate 24 are arranged on the outside of pinholes 22 and 23. Optical axes Da and Fb of laser light emitted from laser light sources 21a and 21b and small holes 22a, 22b, 23a, and 23b of pinholes 22 and 23 coincide or approximately coincide with an adjustment virtual incidence optical axis Jia, an adjustment virtual emission optical axis Joa, adjustment virtual incidence view angle lines Jia and Jib, and adjustment virtual emission view angle lines Joa and Job of an image forming lens 5, and a diffraction pattern K is displayed on the observation plate 24, and in this state, the image forming lens 5 is mounted on a lens block 4, whose position is controlled by pins 4a and 4b, and has the position adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position adjusting device for an image forming lens, a position adjusting method for an image forming lens, and a document reading device. More specifically, a light flux containing document reading information is formed on a light receiving means. The present invention relates to a position adjusting device for an image forming lens for accurately adjusting the position of the image forming lens, a position adjusting method for the image forming lens, and a document reading device capable of appropriately adjusting the position of the image forming lens.

[0002]

2. Description of the Related Art Although there are various types of document reading devices, a light flux containing document reading information (document image information) is introduced into a light receiving element by using an optical system including an imaging lens. In the document reading apparatus, the position control of the imaging lens is an important issue for the reading quality of the document reading apparatus.

Such a conventional document reading apparatus, for example,
In a transmissive document reading device using a CCD line sensor, a light source irradiates a document sandwiched between a contact glass and a pressure glass with light, and a light flux containing read information of the transmitted document is mirrored. And then enters the imaging lens. The imaging lens focuses incident light on a CCD line sensor, which is a light receiving element, to form an image, and the CCD line sensor photoelectrically converts the incident light to read an original image.

In a document reading apparatus using such an optical system, when all the assembled and adjusted optical members are arranged at the design position (ideal position), the optical axis of the light beam and the lens light of the imaging lens are arranged. The axis is completely coincident with each other, and the light beam is incident perpendicularly on the imaging lens, and high-quality reading can be performed.

However, in a digital document reading apparatus using a CCD, in order to improve the quality of a read image, a reading line on the document surface, a reading line of the CCD,
Is important to match. .

In particular, in recent years, in order to increase the resolution of a read image, a plurality of CCDs are arranged in the read line direction (main scanning direction) to increase the number of read pixels. In a document reading device in which a plurality of CCDs are arranged, in order to match the reading line on the document surface with the reading line of the CCD, not only the connection adjustment of the reading line in the sub-scanning direction but also the main scanning direction is performed. It will also be necessary to adjust the connection of the reading line.

As a means for adjusting the connection of such reading lines, for example, a position adjusting device for a solid-state image pickup device described in Japanese Patent Publication No. 55-18096, or Japanese Patent Laid-Open No. 59-18059.
There is a document reading device and the like described in Japanese Patent Laid-Open No. 122171.

In the position adjusting device described in Japanese Patent Publication No. 55-18096, the relative positions of the plurality of CCDs and the imaging lens are adjusted in the main scanning direction and the sub scanning direction by using an adjusting screw and an elastic plate such as a spring. By finely adjusting, connection adjustment of the reading line is performed. Also, JP-A-59-12217
In the document reading apparatus described in Japanese Unexamined Patent Publication No. 1 publication, the CCD and the imaging lens are modularized, the module is moved with respect to the document surface, and the position of the scanning line on the document surface is adjusted to connect the reading lines. Making adjustments.

In the conventional document reading apparatus, if a certain point on the document surface and the CCD are relatively displaced within the range of lens performance, light is obliquely incident on the imaging lens. Since the original can be read even if it is deviated from the lens optical axis, the deviation between the optical axis of the light beam and the optical axis of the imaging lens has not been a serious problem.

However, it is ideal that the principal ray connecting a certain point on the document surface and the CCD is incident perpendicularly to the imaging lens, and the optical axis of the principal ray and the optical axis of the lens coincide with each other. If the optical axis of the chief ray is deviated from the optical axis of the lens, the aberration of the imaging lens will be greatly varied, and the imaging performance will be deteriorated.

Such deterioration of the image forming performance causes deterioration of the image quality and becomes a serious problem in the fields of printing and plate making which require reading of high quality images. Further, as in the above-mentioned known example, one CCD is attached to one imaging lens.
In the case of using a plurality of sets corresponding to the above, when the reading line on the document surface is divided and reading is performed using a plurality of pairs of the imaging lens and the CCD, even if the imaging lenses of the same performance are used, each connection is obtained. The imaging performance varies depending on where each light flux passing through the image lens passes through the imaging lens, and the image quality varies depending on the reading width of the divided original.

An image reading apparatus in which a right-angle mirror is inserted between the imaging lens and the CCD and two CCDs are associated with one imaging lens so that the reading line on the original surface is divided into two and read. (See Japanese Patent Laid-Open No. 57-87277), if the illuminance peak position of the light source on the original surface, the reading position, the lens optical axis, the vertex of the right-angled mirror, etc. are not all the same or substantially the same, the light is incident on each CCD. The generated light flux causes not only the imaging performance but also the absolute light quantity, the light quantity distribution, the reading width, and the like, which deteriorates the image quality.

Therefore, the applicant of the present invention firstly discloses "a method for adjusting the optical axis of the document reading device and the imaging lens" (Japanese Patent Application No. 6-272).
No. 076) is proposed. This is to improve the quality of the read image by matching the lens optical axis of the imaging lens with the adjusted virtual optical axis (design position) of the apparatus body.

[0014]

However, in the document reading apparatus and the optical axis adjusting method of the imaging lens previously proposed by the present applicant, attention is paid only to the optical axis and the lens optical axis of the imaging lens is adjusted. Since the adjustment was made to match the virtual optical axis (design position) of the device body, the reading performance near the optical axis,
That is, although the image quality can be improved, there is still room for improvement in the entire reading width of the document.

That is, if the performance around the angle of view line of the effective light flux passing through the object height and the image height of the imaging lens is equivalent to around the optical axis, good image quality can be obtained over the entire reading width. If the performance of the imaging lens around the angle of view line of the effective light flux is not equivalent to that near the optical axis, the image quality is degraded. Therefore, there is still room for improvement in improving the image quality.

Therefore, according to the first aspect of the present invention, it is possible to improve the setting accuracy of the adjusted virtual angle-of-view line that serves as a reference for adjusting the position of the imaging lens, and to improve the adjustment accuracy when adjusting the position of the imaging lens. An object of the present invention is to provide a position adjusting device for an imaging lens that can be improved.

According to the second aspect of the present invention, the position adjustment accuracy of the image forming lens can be further improved by adjusting the position of the image forming lens not only for the angle of view line but also for the optical axis. An object is to provide a position adjusting device for an imaging lens.

According to the third aspect of the present invention, it is possible to improve the work efficiency of the position adjustment work of the image forming lens when the position adjustment of the image forming lens of the document reading apparatus equipped with the image forming lens of the same characteristics is performed a plurality of times. An object of the present invention is to provide a position adjusting device for an imaging lens that can be used.

According to a fourth aspect of the present invention, by adjusting the projection distance from the minute aperture of the light flux regulating member to the pattern display means, it is possible to clearly understand the adjustment state of the imaging lens. An object is to provide a position adjusting device.

According to the invention of claim 5, the size and shape of the minute opening of the light flux regulating member can be adjusted,
An object of the present invention is to provide a position adjusting device for an image forming lens, which can clearly grasp the adjustment state of the image forming lens.

According to a sixth aspect of the present invention, by preventing the fixing member (constituent member) of the document reading apparatus on which the holding member for holding the imaging lens is placed from bending, the imaging lens before and after the position adjustment is performed. It is an object of the present invention to provide a document reading device capable of improving position accuracy.

According to a seventh aspect of the present invention, the position of the imaging lens can be efficiently adjusted and the distortion of the document reading device before and after the position adjustment of the imaging lens can be reduced. The purpose is to provide a method of adjustment.

The invention according to claim 8 provides an original reading device capable of efficiently performing the position adjustment work of the imaging lens and reducing the distortion of the original reading device before and after the position adjustment of the imaging lens. The purpose is to do.

According to the ninth aspect of the present invention, the position adjusting work of the image forming lens is efficiently performed by assembling a larger number of constituent parts and components to the document reading device before adjusting the position of the image forming lens. An object of the present invention is to provide a method of adjusting the position of an imaging lens, which can be performed and which can further reduce the distortion of the document reading device before and after the position adjustment of the imaging lens.

According to the tenth aspect of the present invention, the position adjusting work of the image forming lens can be efficiently performed by assembling a larger number of components or members to the document reading device before adjusting the position of the image forming lens. An object of the present invention is to provide an original reading device which can be performed and can further reduce the distortion of the original reading device before and after the position adjustment of the imaging lens.

According to the eleventh aspect of the present invention, the position of the imaging lens can be efficiently adjusted while the original reading device is close to the finished product, and the distortion of the original reading device before and after the position adjustment of the imaging lens is improved. It is an object of the present invention to provide a document reading device capable of further reducing the number of sheets.

[0027]

According to another aspect of the present invention, there is provided an image forming lens position adjusting device which illuminates an original with an illuminating means so that a luminous flux including the read information of the original is passed through a predetermined holding member. In a position adjusting device for an image forming lens of an original reading device, which is introduced into an image forming lens held by the image forming device and forms an image on a light receiving means by the image forming lens to read the read information of the original, an optical system including the image forming lens is provided. It is arranged in at least one of the tangential plane and the radial plane of the system, and is arranged on the virtual line of view for adjusting the effective light flux on either side of the entrance and exit of the imaging lens, and And at least one of the tangential surface and the radial surface on the side opposite to the wave light illumination means with the imaging lens interposed therebetween. Of effective luminous flux A light flux restricting member that is disposed on the adjusted virtual angle of view line and has a minute opening that restricts the wave light emitted from the wave light emitting means, and a diffraction pattern of the wave light generated by the light flux restricting member. A pattern display means for receiving and displaying the light, and an image forming lens adjusting means for adjusting the position of the image forming lens with respect to the incident light beam, and at least the light flux regulating member and the holding member for holding the image forming lens. The above-mentioned object is achieved by adjusting the position of the image-forming lens by the image-forming lens adjusting means based on the diffraction pattern displayed on the pattern display means, the objects being arranged on the same constituent member of the document reading device. Has been achieved.

Here, the position adjusting device for an image forming lens according to the present invention adjusts the position of the image forming lens, but it is not visible in reality, but a fictitious angle of view line (adjustment) of the image forming lens is adjusted. The virtual field angle line) is set by the wave light illuminating means and the light flux regulating member in at least one of the tangential plane and the radial plane of the optical system including the imaging lens, and the pattern display means is diffracted. Displayed as a pattern, based on the state of the diffraction pattern before and after the installation of the imaging lens,
The position of the imaging lens is adjusted.

The wave light irradiating means emits, for example, laser light as wave light to the adjusted virtual incident field angle line, and the light flux regulating member regulates the wave light by the minute opening.
It is possible to set an appropriate adjusted virtual angle-of-view line, generate diffraction, and display a diffraction pattern on the pattern display means, and use a circular shape, a rectangular shape, an elongated slit shape, or the like as the minute opening.

In the diffraction pattern displayed on the pattern display means, the wave light passes through the adjusted virtual angle of view line before the image forming lens is installed, and the minute aperture of the light flux regulating member has the adjusted virtual angle of view. When it is located on the line, it is formed into a striped shape that spreads out at regular intervals, and when it is deviated, distortion occurs in this striped pattern at regular intervals.

Therefore, in adjusting the position of the imaging lens, after setting the position adjusting device of the imaging lens so that the diffraction pattern has a striped shape with equal intervals, the imaging lens is disposed and the imaging lens is arranged. So that the diffraction pattern by the wave light that has passed through becomes a diffraction pattern similar to the state before the installation of the imaging lens (actually, it becomes a diffraction pattern in which the stripe-shaped intervals are widened by the imaging lens). The position of the image lens is adjusted by the image forming lens adjusting means.

In adjusting the position of the imaging lens, the light flux regulating member is an important member in setting the adjusted virtual angle of view line, and the positional accuracy of the light flux regulating member has a great influence on the adjustment accuracy of the imaging lens. give.

Therefore, in the present invention, by setting the light flux regulating member on the same constituent member of the document reading device as the imaging lens whose position is to be adjusted, the setting accuracy of the adjusted virtual angle-of-view line can be improved. In addition to the improvement, the adjustment accuracy when adjusting the position of the imaging lens is improved.

According to the above construction, since the light flux regulating member and the imaging lens are arranged on the same constituent member, the setting accuracy of the adjusted virtual angle-of-view line can be improved and the imaging lens The adjustment accuracy at the time of position adjustment can be improved, and the position adjustment accuracy of the imaging lens can be improved.

In this case, for example, as described in claim 2, the position adjusting device of the imaging lens emits the wave light on the adjusted virtual optical axis on either side of the entrance and exit of the imaging lens. And a light flux regulating member having a fine aperture for regulating the undulating light emitted from the undulating light illuminating means on an adjustment virtual optical axis of the imaging lens opposite to the undulating light illuminating means. And may be further provided.

According to the above arrangement, the position of the imaging lens can be adjusted not only with respect to the angle of view line but also with respect to the optical axis, and the position adjustment accuracy of the imaging lens can be further improved.

In the image-positioning lens position adjusting apparatus of the third aspect of the present invention, the document is illuminated by the illuminating means, and the light flux containing the read information of the document is held through a predetermined holding member. In a position adjusting device of an image forming lens of a document reading device which is introduced into a lens and forms an image on a light receiving means by the image forming lens to read the read information of the document, in a tangential plane of an optical system including the image forming lens. And at least one of the radial planes, and is a wave light illumination that is disposed on the virtual line of view for adjusting the effective light flux on either side of the entrance and exit of the imaging lens and emits the wave light. Means and
On at least one of the tangential surface and the radial surface on the side opposite to the wave light illuminating means with the imaging lens interposed, on the virtual line of view for adjusting the effective light flux of the imaging lens. And a light flux restricting member having a minute opening for restricting the wave light emitted from the wave light emitting means, and a diffraction pattern of the wave light generated by the light flux restricting member is received and displayed. A pattern display means, an image forming lens adjusting means for adjusting the position of the image forming lens with respect to an incident light beam, and at least the wave light illuminating means are installed, and at least the image forming device which is a component of the document reading apparatus. A position adjusting table on which a fixing member for fixing the holding member for holding the lens is detachably installed, and the wave adjusting unit is attached to the position adjusting table. The document reading device is located at a position where the optical axis of the wave light emitted by the means coincides with or substantially coincides with the adjusted virtual optical axis of the imaging lens or the adjusted virtual field angle line of the effective light flux of the imaging lens. A positioning means for positioning the fixing member is provided, and the position of the imaging lens is adjusted by the imaging lens adjusting means based on the diffraction pattern displayed on the pattern display means, thereby achieving the above object. ing.

Here, the position adjustment table has at least a flatness suitable for adjusting the position of the imaging lens on which the wave light illuminating means and the document reading device are mounted, and the document reading device is fixed. Positioning means for positioning the members, such as pins, are provided.

According to the above construction, when at least the wave light illuminating means among the constituent means of the position adjusting device for the image forming lens is once installed on the position adjusting table and the position is adjusted, an image having the same characteristics is formed. When a plurality of positions of the imaging lens of the document reading device equipped with the lens are adjusted, it is not necessary to adjust the position of the wave light illuminating means again, and the holding member for holding the imaging lens is fixed. Can be installed on the same position adjustment table with their positions regulated, so that the imaging lens is installed in a state adjusted to some extent with respect to the adjusted virtual optical axis and the adjusted virtual angle of view line emitted by the wave light illumination means. be able to. As a result, the position adjustment of the imaging lens can be performed more accurately, and the work efficiency of the position adjustment work of the imaging lens can be improved.

In each of the above cases, for example, as described in claim 4, in the position adjusting device for the image forming lens, the light flux regulating member is arranged in the adjustment virtual optical axis direction of the image forming lens or in the connection state. Adjustment of effective light flux of image lens Light flux regulating member position adjusting means for position adjustment in the direction of the virtual angle of view line and the pattern display means are adjusted in the virtual optic axis direction of the imaging lens, or effective light flux of the imaging lens. Adjustment of at least one of the pattern position adjusting means for adjusting the position in the direction of the virtual angle of view is further provided, and the projection distance from the minute opening of the light flux regulating member to the pattern displaying means is adjusted. It may be one.

According to the above arrangement, the projection distance from the minute opening of the light flux regulating member to the pattern display means is adjusted,
The diffraction pattern displayed on the pattern display means can be displayed in an appropriate state, and the adjustment state of the imaging lens can be clearly understood. As a result, the position adjustment accuracy of the imaging lens can be improved.

Further, for example, as described in claim 5, the light flux regulating member may be provided with an opening variable means for adjusting at least one of the size and the shape of the minute opening.

According to the above construction, by adjusting the size and shape of the minute opening of the light flux regulating member, the display state of the diffraction pattern displayed on the pattern display means can be made appropriate and the image formation can be achieved. The adjustment state of the lens can be clearly understood. As a result, the position adjustment accuracy of the imaging lens can be improved.

A document reading apparatus according to a sixth aspect of the invention is a document reading apparatus in which the position of the image forming lens is adjusted by the position adjusting device for the image forming lens according to any one of the first to fifth aspects. Of the fixing member of the document reading device in which the holding member that holds the imaging lens is installed, at least a portion where the holding member is installed or a peripheral portion thereof has a predetermined rigidity. The above object is achieved by being reinforced by.

Here, the image forming lens becomes larger and heavier as the image quality of the document reading apparatus becomes higher and the image quality becomes higher, and the image forming lens is placed through the holding member. If the fixing member is curved due to the weight of the imaging lens, it affects the positional accuracy of the imaging lens, and thus the image quality of the document reading device.

That is, even if the position of the image forming lens is adjusted with high accuracy by the position adjusting device for the image forming lens according to any one of claims 1 to 5, the image forming lens is fixed through the holding member to the fixing member of the document reading device. If the fixing member bends when fixed to, the positional accuracy of the imaging lens will be distorted, which will affect the reading accuracy of the document reading device.

Therefore, in the present invention, the fixing member of the document reading device on which the holding member for holding the imaging lens is placed is reinforced by the reinforcing member.

According to the above construction, it is possible to prevent the fixing member of the document reading apparatus on which the holding member for holding the imaging lens is mounted from being bent due to the load of the imaging lens, and the imaging lens before and after the position adjustment. The position accuracy of can be improved. As a result, the reading accuracy of the document reading device can be improved.

According to a seventh aspect of the invention, there is provided a method for adjusting the position of an imaging lens, wherein the position adjustment device for the imaging lens according to any one of the first to fifth aspects is used. A method of adjusting the position of an imaging lens for adjusting the position, wherein the constituent parts and constituent members of the document reading device other than the constituent parts and the constituent members that become obstacles when the position of the imaging lens is adjusted. After the component and the component are assembled to the document reading device before the position of the imaging lens is adjusted and the position of the image lens is adjusted, the component and the component that become the obstacle The above object is achieved by assembling the above.

Here, the components and components of the document reading apparatus which obstruct the adjustment of the position of the imaging lens are, for example, components and components that shield the wave light (for example, the passage position of the wave light). The optical system parts of the document reading device, the holding member of the optical system parts, the side plate of the document reading device, etc., and the component parts or components that hinder the installation of the light flux regulating member (for example, the side plate of the document reading device or the same). Accessory member).

According to the above configuration, before adjusting the position of the imaging lens, the components other than the components and the members of the document reading device, which are obstacles to the position adjustment of the imaging lens, are adjusted. Since it is assembled to the document reading device, the position adjustment work of the imaging lens can be efficiently performed, and external force at the time of assembling the components and components of the document reading device and the load of the document reading device due to these loads. By reducing the distortion, the distortion of the document reading device before and after the position adjustment of the imaging lens can be reduced, and the reading accuracy of the document reading device can be improved.

According to an eighth aspect of the present invention, there is provided a document reading apparatus in which the position of the image forming lens is adjusted by the position adjusting device for the image forming lens according to any one of the first to fifth aspects. In the apparatus, a state in which, of the components and components of the document reading apparatus, the components and the components other than the components that obstruct the position adjustment of the imaging lens and the components are assembled. The position of the image forming lens is adjusted by, and after the position of the image forming lens is adjusted, the obstacle and the component are assembled, thereby achieving the above object.

According to the above configuration, before adjusting the position of the imaging lens, the components or components other than those of the document reading apparatus which hinder the position adjustment of the imaging lens are adjusted. Since it is assembled to the document reading device, the position adjustment work of the imaging lens can be efficiently performed, and external force at the time of assembling the components and components of the document reading device and the load of the document reading device due to these loads. By reducing the distortion, the distortion of the document reading device before and after the position adjustment of the imaging lens can be reduced, and the reading accuracy of the document reading device can be improved.

According to a ninth aspect of the present invention, there is provided a method for adjusting the position of an image forming lens, wherein the position adjusting device for the image forming lens according to any one of the first to fifth aspects is used. A method for adjusting the position of an image forming lens for adjusting the position, comprising: among the component parts and the component members of the document reading apparatus, the component parts and the component members that are obstacles when adjusting the position of the image forming lens. The component or the component for blocking the wave light emitted from the wave light illuminating means is detachable, and is removed when the position of the imaging lens is adjusted, and the image is formed. A configuration that obstructs the position adjustment of the component or the component member that obstructs the position adjustment of the lens so that the obstruction can be avoided. Before the position adjustment of the imaging lens is carried out together with parts other than the product and the constituent member, the component or the constituent member is removed after being assembled to the original reading device and the position of the imaging lens is adjusted. The above object is achieved by assembling the above.

Here, as the component or the component for shielding the wave light when adjusting the position of the imaging lens, for example, an optical system part of the document reading device at the wave light passing position, or this optical system is used. A holding member for the parts, a side plate of the document reading device, and the like, which are configured to be detachable, and when the position of the imaging lens is adjusted, the position is adjusted in the removed state.

The components and components which obstruct the installation of the light flux regulating member are, for example, the side plate of the document reading device and its attached members, which are attached or detached to the optical components or the image forming lens. The shape and configuration should not hinder the position adjustment.

According to the above-mentioned structure, the position adjustment of the imaging lens is performed with respect to more components and constituent members other than those of the document reading device which shields the wave light when the position of the imaging lens is adjusted. Since it can be assembled to the original reading device before, the position adjustment work of the imaging lens can be efficiently performed, and at the same time, the external force at the time of assembling the components and components of the original reading device and the load thereof It is possible to further reduce the distortion of the document reading device, further reduce the distortion of the document reading device before and after the position adjustment of the imaging lens, and further improve the reading accuracy of the document reading device.

According to a tenth aspect of the document reading apparatus of the present invention,
A document reading device in which the position of the image forming lens is adjusted by the position adjusting device for the image forming lens according to any one of claims 1 to 5, and the components and components of the document reading device. Of the constituent parts and the constituent members that obstruct the adjustment of the position of the imaging lens, the constituent parts or the constituent members that shield the wave light emitted from the wave light illumination means can be attached or detached. As a configuration, the component is removed during the position adjustment, and the component or the component that becomes an obstacle in the position adjustment of the imaging lens is shaped and configured to avoid the obstacle, and the position is adjusted. Assembled in the document reading device before adjusting the position of the imaging lens together with the obstructing component and components other than the component It was carried out, after the position adjustment of the imaging lens, by making the assembly of the components and the components are the removed, have achieved the above objects.

According to the above-mentioned structure, the position adjustment of the imaging lens is performed for a larger number of components and constituents other than the constituent parts and components of the document reading device which shield the wave light when adjusting the position of the imaging lens. Since it can be assembled to the original reading device before, the position adjustment work of the imaging lens can be efficiently performed, and at the same time, the external force at the time of assembling the components and components of the original reading device and the load thereof It is possible to further reduce the distortion of the document reading device, further reduce the distortion of the document reading device before and after the position adjustment of the imaging lens, and further improve the reading accuracy of the document reading device.

According to the document reading apparatus of the invention described in claim 11,
A document reading device in which the position of the image forming lens is adjusted by the position adjusting device for the image forming lens according to any one of claims 1 to 5, and the components and components of the document reading device. Of the constituent parts and the constituent members that are obstacles when adjusting the position of the imaging lens, the constituent parts or the constituent members for blocking the wave light emitted from the wave light illumination means are The above-described object is achieved by forming an opening having a size equal to or larger than the light flux width of the wave light and assembling it in the document reading device before adjusting the position of the imaging lens.

According to the above-mentioned structure, the position adjustment of the imaging lens is performed by adding more components or constituents other than the components or members of the document reading apparatus, which are obstacles to the position adjustment of the imaging lens. Since it can be assembled to the document reading device before performing, the position adjustment work of the imaging lens can be efficiently performed, and the position adjustment of the imaging lens is performed in a state where the document reading device is close to a finished product. Therefore, it is possible to further reduce the distortion of the document reading device before and after the position adjustment of the imaging lens and further improve the reading accuracy of the document reading device.

[0062]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Since the embodiments described below are preferred embodiments of the present invention, various technically preferable limitations are given, but the scope of the present invention is particularly limited in the following description. Unless specifically stated to limit the present invention, the present invention is not limited to these embodiments.

FIGS. 1 to 7 are views showing a first embodiment of an image-forming lens position adjusting device, an image-forming lens position adjusting method, and a document reading device according to the present invention. ,
The present invention is applied to a transparent document reading type document reading device using a CCD line sensor, a position adjusting device for an image forming lens thereof, and a position adjusting method thereof.

In this embodiment, a pinhole for adjusting the position of the imaging lens is installed on the same member as the imaging lens of the document reading device, and the pinhole and the imaging lens are fixed to the document reading device. The document reading device is provided with a positioning member for doing so, and corresponds to claim 1 and claim 2.

In FIG. 1, in the document reading apparatus 1, a lens block 4 (see FIG. 3) which is a holding member is installed on a base (fixing member) 3 of a main body case 2, and the lens block 4 is an imaging lens. Holds 5. Document reading device 1
Is provided with a CCD line sensor (hereinafter, simply referred to as CCD) 6 as a light receiving means and a mirror 7 with the imaging lens 5 interposed therebetween, and a cold mirror 8 is provided above the mirror 7. Light is emitted from a light source 9 to the cold mirror 8, and a carriage 10 is movably arranged between the mirror 7 and the cold mirror 8. The carriage 10 includes a contact glass 11 and a contact glass 11
It is equipped with a pressing glass 12 arranged close to the top,
The document 13 is placed between the contact glass 11 and the pressing glass 12.
Sandwich. The carriage 10 is connected to a driving unit (not shown), and is moved in the arrow direction (sub scanning direction) in FIG. 1 at a predetermined speed corresponding to the reading resolution by the driving unit.

The document reading device 1 irradiates the cold mirror 9 with light from the light source 9, reflects the light with the cold mirror 9, and irradiates the document 13. The light applied to the original 13 is transmitted through the original 13 and is applied to the mirror 7, and the original 1
The light that has passed through 3 is applied to the mirror 7 as a light flux A containing image information. The mirror 7 reflects the incident light flux A in the direction of the imaging lens 5, and the imaging lens 5 causes the incident light flux A to CC.
D6 is focused and irradiated. The CCD 6 main-scans the incident light in the main-scanning direction (line direction) and photoelectrically converts the incident light into the original 1
Read image 3

As shown in FIGS. 1 and 2, the optical system 14 extending from the light source 9 to the cold mirror 8, the mirror 7, the imaging lens 5 and the CCD 6 has an ideal position (design position), that is, The optical axis C of the imaging lens 5 and the optical axis B of the light flux A coincide with each other, and the angle-of-view lines H1 to H of the imaging lens 5
4 and the angle-of-view lines G1, G2, I1, and I2 of the light flux A are all aligned with each other, the light flux A passing through the light source 13 has an optical axis B of the imaging lens 5. Through the angle of view lines G1, G2, I1, and I2 of the imaging lens 5 and the C of the design position.
The image is formed at the image forming position of the CD 6, the image is not distorted, and the absolute light amount and the light amount distribution are uniform, so that good image quality can be obtained.

That is, as shown in FIGS. 1 and 2, in the document reading apparatus 1, in order to obtain high image quality, the luminous flux A
The optical axis B of the image forming lens 5 and the optical axis C of the imaging lens 5 are not only matched or substantially matched, but also the angle of view lines G1, G2 of the light flux A,
It is necessary to match or substantially match I1 and I2 with the angle-of-view lines H1 to H4 of the imaging lens 5. 1 shows a radial surface (Radial surface, hereinafter referred to as R surface) of the optical system 14, and FIG. 2 shows a tangential surface (Tangential surface) of the optical system 14 which is a surface perpendicular to the R surface. ,Less than,
It is called the T side. ).

Therefore, in the present embodiment, the position adjustment of the imaging lens 5 of the document reading device 1 is performed by using the position adjusting device 20 shown in FIGS.
This is done for both the optical axis and the angle of view line by utilizing an optical phenomenon.

3 and 4, the position adjusting device 20 is shown.
Is a pair of pinholes (light flux regulating members) 2 arranged with three laser light sources (wave light illuminating means) 21a and 21b for emitting laser light as wave light and the imaging lens 5 interposed therebetween.
2 and 23, an observation plate (pattern display means) 24, etc. are provided, and FIG. 3 shows an R surface and FIG. 4 shows a T surface.

Further, in reality, the fictitious adjusted virtual incident optical axis, which is not visible, is used for convenience in designing and adjustment, Jia, adjusted virtual incident angle of view line, Jib, adjusted virtual outgoing optical axis. , Joa, the adjusted virtual exit angle of view line, J
Let ob be the laser optical axis of the laser light emitted from the laser light source 21a, Da, the laser optical axis of the laser light emitted from the laser light source 21b, Db, the optical axis of the imaging lens 5, C, and the angle of view line. Hereinafter, the angle of view lines of the light flux A of the light source 9 of the document reading apparatus 1 and H1 to H4 will be described as G1, G2, I1, and I2. When the adjusted virtual incident optical axis Jia and the adjusted virtual incident field angle line Jib are properly adjusted in position of the imaging lens 5, finally, the light flux A from the light source 9 of the document reading apparatus 1 is finally detected. It corresponds to the optical axis B and the angle-of-view lines G1 and I1.

As shown in FIG. 3, the lens block 4 for holding the imaging lens 5 is installed on the base 3 of the document reading apparatus 1 as described above.
Are pins 25a, 25 formed on the base 3 shown in FIG.
It is arranged in a state of being positioned by b. That is, the pins 25 a and 25 b for setting the position of the imaging lens 5 via the lens block 4 are formed on the upper surface of the base 3 so as to project from the surface of the base 3, and the lower end surface of the lens block 4 is formed on the lower surface. The holes 4a and 4b into which the pins 25a and 25b enter are formed. Lens block 4
Is positioned and disposed on the base 3 in a state in which the pins 25a and 25b enter the holes 4a and 4b and are restricted from moving in the X direction and the Yθ direction.

A pinhole 22 and a pinhole 22 are provided at both ends of the light incident side and the light emitting side of the base 3 with the lens block 4 interposed therebetween.
23 is arranged, and as shown in FIG. 4, one small hole 22a as a minute opening is formed on the T surface of the pinhole 22.
And two small holes 22b are formed in the pinhole 23, and one small hole 23a and two small holes 23b are formed as minute openings.

As shown in FIG. 5, three pins 26a to 26c are provided on the upper surface of the base 3 where the pinholes 22 are arranged.
Are formed so as to project from the surface of the base 3, and holes 22c to 22e into which the pins 26a to 26c enter are formed in the lower end surface of the pin hole 22. In the pinhole 22, the pins 26a to 26c have holes 22c to 22e.
Is positioned in a state of approaching to and is arranged on the base 3.

As shown in FIG. 5, the three pins 27a to 27c are provided on the upper surface of the base 3 where the pinholes 23 are arranged.
Is formed so as to project from the surface of the base 3,
The pins 27a to 27c are provided on the lower end surface of the pinhole 23.
The holes 23c to 23e into which the entry is made are formed. In the pinhole 23, the pins 27a to 27c are the holes 23c to 23c.
It is positioned so as to enter e and is placed on the base 3.

That is, the original reading device 1 called the base 3
An imaging lens 5, a pinhole 22 as a light flux regulating member, and a pinhole 23 are arranged on the same component member via a lens block 4.

Then, the pins 25a and 25b for positioning the lens block 4 and the pins 26a to 26c and 27a to 27c for positioning the pin holes 22 and 23 in the center of the pins 26b and 27b are adjusted as shown in FIG. It is formed so as to coincide with the virtual incident optical axis Jia and the adjusted virtual outgoing optical axis Joa.

The three laser light sources 21a and 21b are arranged outside the pinhole 22, and the generated diffraction pattern K (see FIG. 6) is formed outside the pinhole 23.
And FIG. 7), an observation plate 24 is arranged as a pattern display means for receiving and displaying the received light.

The laser light source 21a is arranged so that the laser light axis Da of the emitted laser light is located on the adjusted virtual incident light axis Jia, and the two laser light sources 21b are arranged so that each laser of the emitted laser light is The optical axis Db is arranged so as to be located on the adjusted virtual incident field angle line Jib.

The pinhole 22 has a small hole 22a.
Is located on the adjusted virtual incident optical axis Jia, and the centers of the two small holes 22b are located on the adjusted virtual incident field angle line Jib.

Further, the pinhole 23 is the small hole 23.
The center of a is located on the adjusted virtual emission optical axis Joa, and
It is located on an extension of the adjusted virtual incident view angle line Jib, and the centers of the two small holes 23b are located on the two adjusted virtual exit view angle lines Job.

The image forming lens 5 is movably supported by an image forming lens adjusting means (not shown) such as a spacer or a micro head. As will be described later, the position of the image forming lens 5 with respect to the incident light flux is adjusted by the image forming lens adjusting means.
oa, the adjusted virtual incident view angle line Jib and the adjusted virtual exit view angle line Job are moved and adjusted.

The observation plate 24 is arranged behind the pinhole 23 on a member different from the base 3, and receives the diffraction pattern K of the laser light passing through the small holes 23a and 23b of the pinhole 23. To display.

Next, the operation will be described.

In this embodiment, the optical axis C of the imaging lens 5 and the angle-of-view lines H1 and H2 are moved by the position adjusting device 20.
The position of the imaging lens 5 is simply and accurately adjusted so that the optical axis C of the light flux A of the light source 9 of the document reading device 1 and the angle-of-view lines I1 and I2 coincide or substantially coincide with each other.

That is, when the position of the imaging lens 5 is adjusted, the pin holes 22 and 23 are formed on the base 3, and the pins 26a to 26c and the pins 27a to 26a to 26c are formed.
The laser light source 21
The a and 21b and the observation plate 24 are arranged outside the pinhole 22 and the pinhole 23, respectively. In addition, the laser light sources 21a and 21b and the observation plate 24 are connected to the plurality of document reading devices
When the position adjustment of the imaging lens 5 is continuously performed, the imaging lens 5 is placed in a steady position.

In this case, the laser light sources 21a and 21b and the pinholes 22 and 23 have the laser light source 2 as described above.
The laser optical axis Da of the laser light emitted by 1a is located on the adjusted virtual incident optical axis Jia, and each laser optical axis Db of the laser light emitted by the two laser light sources 21b is on the adjusted virtual incident view angle line Jib. Located and also the small hole 22 of the pinhole 22
The center of a is two small holes 2 on the adjusted virtual incident optical axis Jia.
The center of 2b is located on the adjusted virtual incident field angle line Jib, and the center of the small hole 23a of the pinhole 23 is on the adjusted virtual exit optical axis Joa on the extension line of the adjusted virtual incident field angle line Jib. In addition, it is necessary that the centers of the two small holes 23b are arranged so as to be located on the two adjusted virtual emission field angle lines Job.

Then, in such a state, as shown in FIG. 6, a diffraction pattern K having a concentric circular (striped) uniform light amount distribution is projected on the observation plate 24 and is displaced. In this case, for example, when the light is obliquely incident, the position of the center does not change and the shape becomes an ellipse depending on the incident angle, as shown in FIG.

When the diffraction pattern K projected on the observation plate 24 does not have a concentric uniform light amount distribution as shown in FIG. 6, a laser light source is provided so that the diffraction pattern K as shown in FIG. 6 can be obtained. The positions of 21a and 21b are adjusted.

That is, although not actually visible, the fictitious adjusted virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident angle of view line Jib, and the adjusted virtual outgoing angle of view line Job are imaginary in terms of design and adjustment. By setting the adjusted virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident angle of view line Jib, and the adjusted virtual outgoing angle of view line Job, the imaging lens 5 to be position-adjusted. On the base 3 on which the lens block 4 to be held and fixed is installed, the pin holes 22 and 23 are pin 26a to 26c and pin 27a to.
Since the positions are regulated by 27c, the pinholes 22 and 23 are properly set in positional accuracy.

Therefore, by adjusting the positions of the laser light sources 21a and 21b so that the diffraction pattern K becomes the diffraction pattern K as shown in FIG. 6, the optical axis Da of the laser light emitted from the laser light source 21a is adjusted and virtually incident. The optical axis Dia of the laser light emitted from the laser light source 21b can be set on the optical axis Jia, and the adjusted virtual incident field angle line Jib can be set.

That is, as shown in FIG. 5, pins 25a and 25b for restricting the position of the imaging lens 5 and pins 26a for restricting the positions of the pinholes 22 and 23 are formed on the same member called the base 3. 26c, pins 27a to 27c
And are formed, and the adjusted virtual incident optical axis Jia
And the small holes 22a and 22b of the pinhole 22 and the small holes of the pinhole 23, which are formed by arranging the centers of the pins 25a and 25b for regulating the position of the imaging lens 5 on the adjusted virtual emission optical axis Joa. 23a and 23b are the adjusted virtual incident optical axis Jia and the adjusted virtual incident field angle line J as described above.
ib, the adjusted virtual emission optical axis Joa, and the adjusted virtual emission angle of view line Job are formed so as to be mounted and arranged in a state where the relative positional accuracy of these components is improved. Well-placed pinholes 22, 2
By adjusting the positions of the laser light sources 21a and 21b with respect to 3, it is possible to easily set the position of the entire position adjusting device 20,
And it can be performed accurately and properly.

In this way, the laser light sources 21a, 21
When the position adjustment of b is performed, the positions of the laser light sources 21a and 21b are fixed, so that the pinholes 22 of the original reading device 1 can be adjusted even when the positions of the imaging lenses 5 of the large number of original reading devices 1 are adjusted. , A pin 26a for regulating the positions of 23
26c and 27a to 27c are formed, it is not necessary to adjust the positions of the laser light sources 21a and 21b thereafter, and the position of the imaging lens 5 can be adjusted easily and accurately.

When the above setting is completed, the lens block 4
And the imaging lens 5 is attached to the base 3, and the imaging lens 5 is supported by the imaging lens adjusting means (not shown),
The position of the imaging lens 5 is adjusted.

At this time, the lens block 4 has the pins 25a, 25 formed so as to coincide with the adjusted virtual incident optical axis Jia and the adjusted virtual outgoing optical axis Joa on the base 3 as described above.
Since the movement is restricted by b and the imaging lens 5 is held by the lens block 4, the positional accuracy of the imaging lens 5 in the X direction and the Yθ direction is roughly adjusted in advance.

Therefore, the imaging lens 5 and the pinhole 2
2 and 23 and the height from the base 3 to the adjusted virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident angle of view line Jib, and the adjusted virtual outgoing angle of view line Job are highly accurate. The state is set in advance.

As a result, the position of the image forming lens 5 can be adjusted by finely adjusting the image forming lens 5 in the X direction and the Yθ direction by the image forming lens adjusting means, and the position adjusting work is simple and quick. Can be done.

The position of the imaging lens 5 is adjusted by setting the diffraction lens K on the observation plate 24 with the imaging lens 5 installed.
Is projected, and the imaging lens 5 is moved in the Y direction and the Xθ direction while observing the diffraction pattern K.

That is, before the image forming lens 5 is installed, the laser light from the laser light sources 21a and 21b passes through only the small hole 23a of the pinhole 23 and passes through the point 2 on the observation plate 24.
The diffraction pattern K is projected onto the points 4a and 24b, but when the imaging lens 5 is installed, the points 24 on the observation plate 24 are
The diffraction pattern K projected on b moves from the point 24b to the point 24c.

At this time, if the distances X1 and X2 from the point 24b to the point 24c are substantially equal and the shapes of the diffraction patterns K are substantially the same (the ellipse of FIG. 6), the adjusted virtual incident field angle. The line Jib and the incident field angle line H1 of the imaging lens 5 and the adjusted virtual exit field angle line Job and the exit field angle line H2 of the imaging lens 5 respectively match, and the X direction and the Yθ direction of the imaging lens 5 are the same. No adjustment (in the T-plane) is necessary.

However, when the distances X1 and X2 are not equal to each other, or when the shape of the elliptical diffraction pattern K is different from the diffraction pattern K before the imaging lens 5 is attached, the adjusted virtual incident view angle line Jib is set. Image forming lens 5
This means that the incident field angle line H1 of is shifted, and adjustment of the imaging lens 5 in the X direction and the Yθ direction is performed.
In this case, the imaging lens 5 is moved in the X direction and the Yθ direction within the T plane by the imaging lens adjusting means, and the distance X1,
The position of the imaging lens 5 is adjusted by adjusting X2 to match and adjusting the shape of the diffraction pattern K to match the shape before the installation of the imaging lens 5.

In adjusting the position of the imaging lens 5,
Considering the optical property that the light emitted from the image forming lens 5 is inclined when the image forming lens 5 is shifted, and the light emitted from the image forming lens 5 is shifted when the image forming lens 5 is inclined. If the adjustment is performed while doing so, the direction and the amount of adjustment of the imaging lens 5 can be easily grasped, and the work efficiency of the adjustment work can be improved.

The positional deviation between the adjusted virtual exit field angle line Job and the exit field angle line H2 of the imaging lens 5 is caused by the adjustment virtual entrance field angle line Jib and the incident field angle line H1 of the imaging lens 5. When they are matched, they are automatically matched and no adjustment is necessary.

As described above, the laser light sources 21a and 2a, 2
1b, the small holes 22a to 22c of the pinhole 22, the small holes 23a to 23c of the pinhole 23, and the observation plate 24, the adjusted virtual incident optical axis Jia and the adjusted virtual output that are not actually visible but are visible. When the position adjustment of the imaging lens 5 is completed in accordance with the optical axis Joa, the adjusted virtual incident field angle line Jib, and the adjusted virtual exit field angle line Job, the imaging lens 5 is fixed to the lens block 4, and the imaging lens 5
Complete the position adjustment of.

In the document reading apparatus 1 having thus adjusted the position of the imaging lens 5, the light flux A of the light source 9 travels on the adjusted virtual incident optical axis Jia on the T surface during the actual image reading. , Its optical axis B coincides with the optical axis C of the imaging lens 5, and the incident field angle line I1 of the light flux A is the imaging lens 5
Coincides with the incident field angle line H1.

As a result, the document reading device 1 scans the light flux A having a uniform light amount distribution over the entire reading width of the document with the CCD.
6 can be formed into an image, and a high-quality image that can be applied in the fields of printing and plate making can be obtained.

In the above embodiment, if the imaging lens 5 and the pinholes 22 and 23 cannot be installed directly on the base 3, that is, if they cannot be installed on the same plane, at least some member is used. If these members are installed on the base 3, the position of the imaging lens 5 can be easily adjusted with the same accuracy as described above.

In addition, the imaging lens 5 and the pinholes 22, 2
If not only the members necessary for adjusting the position of the imaging lens 5 such as 3 but also the installation parts such as the main constituent members of the document reading device 1 such as the mirror 7 and the CCD 6 are installed on the same member, the optical system 1
The adjustment accuracy of the whole 4 can be improved, and the assembly accuracy of the document reading apparatus 1 can be further improved.

FIG. 8 and FIG. 9 are views showing a second embodiment of the position adjusting device of the image forming lens, the position forming method of the image forming lens, and the document reading device according to the present invention. The base (fixing member) is reinforced in order to improve the positional accuracy of the imaging lens and the pinhole, and corresponds to claim 6.

The present embodiment is applied to the same document reading device and image lens position control device as those of the first embodiment, and has the same structure as that of the first embodiment. The same reference numerals are given to the parts, and detailed description thereof will be omitted.

In FIGS. 8 and 9, a channel (reinforcing member) 30 is fixed to the lower surface of the base 3 so as to be in close contact with the base 3, and the channel 30 is parallel to a parallel channel 31 parallel to the base 3. Two vertical channels 32 projecting downward from the channel 31 are provided.

The length of the parallel channel 31 in the longitudinal direction (horizontal direction in FIGS. 8 and 9) is approximately the distance between the pinhole 22 and the pinhole 23, and its width (vertical direction in FIG. 9).
Has a width of at least the pinhole 22 and the pinhole 23. That is, the parallel channel 31 is arranged at least on the lower surface of the base 3 on which the lens block 4, the pinhole 22 and the pinhole 23 are installed.

The vertical channel 32 is the parallel channel 3
To prevent the vertical deflection of 1.
As shown in FIG. 9, the pins 25a, 25 on which the lens block 4 is installed are provided over the entire length of the parallel channel 31.
Two pieces are arranged in parallel with each other with a predetermined distance therebetween, with b in between.

In the channel 30, the base 3 is concavely curved downward by the load of the lens block 4 installed on the base 3, the imaging lens 5, and the pinholes 22 and 23 installed when adjusting the positions of the imaging lens 5. It is formed of a member having sufficient rigidity to prevent the occurrence of

Therefore, in this embodiment, since the channel 30 is arranged on the lower surface of the base 3,
It is possible to prevent the base 3 from being concavely curved downward due to the load of the lens block 4, the imaging lens 5, and the pinholes 22 and 23 installed when the positions of the imaging lens 5 are adjusted. The position adjustment of the described imaging lens 5 can be performed more accurately, and even if another member is installed in the document reading device 1 after the position adjustment of the imaging lens 5, the base 3 is concavely curved. Thus, it is possible to prevent the positional accuracy of the adjusted imaging lens 5 from being distorted.

That is, when the positions of the optical axis C of the imaging lens 5 and the angle-of-view lines H1 and H2 are adjusted, the imaging lens 5
The pin holes 22 and 23 are important adjusted parts and adjusted parts, and these are pin 25a, 25b, 26a to 26c on the base 3 as shown in the first embodiment.
And 27a to 27c, the lens block 4, the pinhole 22, and the pinhole 23 are installed, and the adjusted virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident field angle line Jib, and the adjusted virtual outgoing are provided. Even when the angle of view line Job and the optical axes Da and Db of the laser light sources 21a and 21b are aligned, when the image forming lens 5 is installed in the lens block 4 when actually adjusting the position of the image forming lens 5, If the base 3 is concavely curved due to the load of the image lens 5, the positional adjustment accuracy of the imaging lens 5 will be incorrect.

In particular, the imaging lens 5 is an important part for determining the image quality read by the document reading apparatus 1. In order to obtain a high quality image, the imaging lens 5 should be large and heavy. Need to use. In the document reading apparatus 1 using the heavy imaging lens 5 as described above,
The concave curve of the base 3 due to the load of the imaging lens 5 is further increased, which affects the position adjustment accuracy of the imaging lens 5.

However, in the present embodiment, since the channel 30 is arranged on the lower surface of the base 3, it is possible to suppress the concave curve of the base 3 during the position adjustment of the imaging lens 5 and after the position adjustment. It is possible to adjust the position of the imaging lens 5 more easily and accurately, and
It is possible to suppress the deviation of the positional accuracy of the imaging lens 5 after the position adjustment, and it is possible to improve the image quality.

FIGS. 10 and 11 are views showing a third embodiment of the image-forming lens position adjusting device, the image-forming lens position adjusting method, and the document reading device according to the present invention. The position of a pinhole on the exit side of the imaging lens can be adjusted, and the aperture diameter of the small hole can be adjusted so that an appropriate diffraction pattern can be projected on the observation plate. It corresponds to 5.

This embodiment is applied to a document reading device and a position adjusting device similar to those of the first embodiment, and the same components as those of the first embodiment are designated by the same reference numerals. Will be attached and detailed description thereof will be omitted.

In FIG. 10 and FIG. 11, the position adjusting device 40 includes a laser light source 21a or 2a on the incident side of the base 3 of the document reading device 1 on which the imaging lens 5 is placed.
1b and the pinhole 41, and the observation plate 24 and the pinhole 42 are disposed on the emission side thereof.

Laser light sources 21a and 21b, pinhole 4
1 and the pinhole 42 respectively have a position adjusting mechanism 43.
a, 43b, 44, 45, and these position adjusting mechanisms 43a, 43b, 44, 45 and the observation plate 24.
Is placed on a predetermined adjustment table (not shown) having good flatness.

In the pinhole 41 and the pinhole 42,
Although not shown in detail, three small holes 41a, 41b and five small holes 42a to 42c for passing the laser beam are formed, and at least the pin hole 42 has a small hole 42.
An aperture diameter variable mechanism (not shown) for adjusting the aperture diameters of a to 42c is provided. The opening diameter changing mechanism (opening part changing means) may be any mechanism as long as it can finely adjust the opening diameters of the small holes 42a to 42c.

The observation plate 24 has a small hole 42 of the pinhole 42.
It is arranged at a position where the diffraction pattern K by the laser light that has passed through a to 42c is appropriately projected.

Laser light sources 21a and 21b, pinhole 4
1 and the pinhole 42 are installed on the adjustment table with the adjustment virtual incident optical axis Jia, the adjustment virtual outgoing optical axis Joa, the adjusted virtual incident angle of view line Jib, and the adjusted virtual outgoing angle of view line Job being roughly adjusted. After that, the position adjusting mechanisms 43a, 43
The position is accurately adjusted by b, 44, and 45, and the observation plate 24 is installed.

Therefore, when the position of the image forming lens 5 of the same type of document reading apparatus 1 is adjusted, the document reading apparatus 1 is installed on the adjustment table and the position of the image forming lens 5 is adjusted. Therefore, the position adjusting device 40 for adjusting the positions of the imaging lenses 5 of a large number of document reading devices 1 can be obtained.
Can be easily set, and work efficiency can be improved.

With this position adjusting device 40, the imaging lens 5
Position adjustment mechanism, the pinhole 42 on the exit side of the imaging lens 5 is adjusted to a position adjusting mechanism (light flux regulating member position adjusting means).
It moves in the Z direction by 45, and the position is adjusted so that the diffraction pattern K by the laser light passing through the pinhole 42 is appropriately formed on the observation plate 24.

That is, since the position adjustment of the imaging lens 5 is performed using the diffraction pattern K projected on the observation plate 24 as described above, the position of the imaging lens 5 is changed depending on the projection state of the diffraction pattern K. The adjustment accuracy is affected, and the diffraction pattern K becomes difficult to see due to the positional relationship between the focal length of the imaging lens 5 and the pinhole 42 arranged on the exit side of the imaging lens 5. However, it becomes difficult to determine the shape and position of the clear diffraction pattern K.

However, in order to improve the projection state of the diffraction pattern K, the focal length of the imaging lens 5 whose position is to be adjusted is changed, or the imaging lens 5 is moved in the optical axis direction (Z direction). It cannot be moved.

Therefore, in the present embodiment, the pinhole 42 is moved in the Z direction by the position adjusting mechanism 45,
The position is adjusted so that the diffraction pattern K is displayed in a good state on the observation plate 24.

Specifically, the position adjusting mechanism 45 for performing shift adjustment in the X and Y directions is also provided with an adjusting mechanism capable of adjusting in the optical axis direction (Z direction), and the adjustment virtual incident optical axis Jia and the adjustment virtual are set. The pinhole 42 is moved in the optical axis direction (Z direction) while maintaining the center position of the small hole 42a of the pinhole 42 positioned on the emission optical axis Joa, and the observation plate 24
The position is adjusted so that the diffraction pattern K is displayed in a good state.

In this case, if the pinhole 42 is moved in the optical axis direction as it is, the small hole 42a positioned on the adjusted virtual incident optical axis Jia and the adjusted virtual outgoing optical axis Joa will be adjusted virtual. The position is properly adjusted while being positioned on the incident optical axis Jia and the adjusted virtual outgoing optical axis Joa.
The small holes 42b and 42c positioned on the adjusted virtual incident view angle line Jib and the adjusted virtual exit view angle line Job are
Positional deviation occurs from the adjusted virtual incident view angle line Jib and the adjusted virtual exit view angle line Job.

Therefore, each small hole 42a of the pinhole 42,
When 42b moves as a unit, at least the adjusted virtual incident view angle line Jib and the adjusted virtual exit view angle line J
This can be dealt with by providing a dedicated X-direction position adjusting mechanism in which the small holes 42b and 42c on the ob are individually movable in the X direction. Further, when the small holes 42a, 42b, 42c are not integrally provided in the pinhole 42 but provided in individual pinholes, the pinholes of the small holes 42a are arranged in the optical axis direction. The pinholes of the small holes 42b and 42c can be dealt with by providing an adjusting mechanism for moving the pinholes 42b and 42c in the directions of the adjusted virtual incident view angle line Jib and the adjusted virtual exit view angle line Job, respectively.

Therefore, by moving the pinhole 42, a good diffraction pattern K can be projected on the observation plate 24, and the position of the imaging lens 5 can be adjusted more accurately.

In this case, the projection state of the diffraction pattern K is adjusted by moving the pinhole 42 arranged outside the base 3 of the document reading device 1, but depending on the model of the document reading device 1. Since the imaging lens 5 used is different and the focal length of the imaging lens 5 is variously different, the pinhole for movement adjustment is not limited to the pinhole 42.

Further, in the present embodiment, the small hole 4 is provided by the opening diameter changing mechanism provided in the pinhole 42.
By adjusting the opening diameter of 2a, 42b, 42c,
The light quantity and size of the diffraction pattern K projected on the observation plate 24 are adjusted to an appropriate state.

As described above, since the position adjustment of the imaging lens 5 is performed using the diffraction pattern K projected on the observation plate 24, the position adjustment accuracy of the imaging lens 5 depends on the projection state of the diffraction pattern K. Will be affected.

Then, the small hole 4 of the pinhole 41 on the incident side.
1a and 41b perform beam shaping of the laser light from each laser light source 21a and 21b and light amount regulation, and the small holes 42a to 42c of the pinhole 42 on the emission side are the final portions of the diffraction pattern K projected on the observation plate 24. It has a role to decide the amount and size of the light. That is, the light amount of the diffraction pattern K is proportional to the size of the diameter of the small holes 42a to 42c of the pinhole 42, and conversely, the size of the diffraction pattern K is the size of the small hole 42.
It is inversely proportional to the size of the diameter of a to 42c.

Therefore, in the present embodiment, by adjusting the opening diameters of the small holes 42a to 42c of the pinhole 42, the light quantity and size of the diffraction pattern K are adjusted for the position of the imaging lens 5. It is adjusted to the one suitable for.

Specifically, while looking at the diffraction pattern K projected on the observation plate 24, the pinhole 42 is provided so that the light amount and size of the diffraction pattern K become a desired light amount and size. Small holes 42a to 42 due to the variable opening diameter mechanism
Adjust the opening diameter of c.

Therefore, the light quantity and size of the diffraction pattern K projected on the observation plate 24 can be set in an appropriate state, and the position of the imaging lens 5 can be adjusted with higher accuracy.

The opening diameter changing mechanism is used for the small holes 42a-4a.
All of the opening diameters of 2c may be changed at the same time, or the opening diameters of the small holes 42a to 42c may be individually changed. In addition, the mechanism for changing the opening diameter has a small hole 42.
Not only the opening diameters of a to 42c but also the shapes of the small holes 42a to 42c may be adjustable. By doing so, the light quantity and size of the diffraction pattern K can be adjusted in a wider range. .

12 and 13 are views showing a fourth embodiment of the image-forming lens position adjusting device, the image-forming lens position adjusting method, and the document reading device according to the present invention. The position of the observation plate can be adjusted, and the opening diameter of the small hole of the pinhole on the exit side of the imaging lens can be adjusted so that an appropriate diffraction pattern can be projected on the observation plate. And corresponds to claim 5.

This embodiment is applied to the same document reading device and position adjusting device as those of the third embodiment, and the same components as those of the third embodiment have the same reference numerals. Will be attached and detailed description thereof will be omitted.

In FIG. 12 and FIG. 13, the position adjusting device 50 sandwiches the base 3 of the document reading device 1 on which the imaging lens 5 is placed, and the laser light sources 21a, 2a are provided on the incident side thereof.
1b and a pinhole 41, and an observation plate 51 and a pinhole 42 are arranged on the emission side thereof.

Laser light sources 21a and 21b, pinhole 4
1 and the pinhole 42 respectively have a position adjusting mechanism 43.
a, 43b, 44, 45, and the pinholes 41 and 42 are not shown in detail,
Three small holes 41a, 41b and 5 for passing laser light
Individual small holes 42a to 42c are formed.

At least the pinhole 42 has a small hole 42.
An aperture diameter varying mechanism (not shown) for adjusting the aperture diameters of a to 42c is provided, and this aperture diameter varying mechanism (opening portion varying means) can appropriately finely adjust the aperture diameters of the small holes 42a to 42c. Any mechanism may be used as long as it is one.

The observation plate 51 is held on a position adjusting mechanism (pattern position adjusting means) 52, and the position adjusting mechanism 5
2 holds the observation plate 51 movably in at least the optical axis direction (Z direction). That is, the position adjusting mechanism 52
Adjusts the observation plate 51 to a position where the diffraction pattern K by the laser light passing through the small holes 42a to 42c of the pinhole 42 is appropriately projected on the observation plate 51.

Laser light sources 21a and 21b, pinhole 4
1 and the pinhole 42 are installed on the adjustment table with the adjustment virtual incident optical axis Jia, the adjustment virtual outgoing optical axis Joa, the adjusted virtual incident angle of view line Jib, and the adjusted virtual outgoing angle of view line Job being roughly adjusted. After that, the position adjusting mechanisms 43a, 43
The position is accurately adjusted by b, 44, and 45, and the observation plate 51 is installed.

Therefore, when the position of the image forming lens 5 of the same type of document reading apparatus 1 is adjusted, the document reading apparatus 1 is set on the adjustment table and the position of the image forming lens 5 is adjusted. Position adjusting device 50 for adjusting the positions of the imaging lenses 5 of a large number of document reading devices 1.
Can be easily set, and work efficiency can be improved.

With this position adjusting device 50, the imaging lens 5
When adjusting the position of the
The position is adjusted so that the diffraction pattern K by the laser light that has passed through the pinhole 42 is appropriately formed on the observation plate 51 by moving in the Z direction by.

That is, as described above, in order to adjust the position of the imaging lens 5, it is necessary that the diffraction pattern K is projected on the observation plate 51 with an appropriate light amount and size.
The diffraction pattern K becomes larger when the projection position is far,
The closer it gets, the smaller it gets.

However, if the diffraction pattern K is made too large during the adjustment of the imaging lens 5, the light quantity deteriorates and the diffraction pattern K becomes blurred. Conversely, if it is made too small, the diffraction before and after the installation of the imaging lens 5 is reduced. The difference in the projection state of the pattern K cannot be determined, and the adjustment accuracy of the imaging lens 5 deteriorates.

Therefore, in this embodiment, the size of the diffraction pattern K can be freely adjusted by changing the projection position of the diffraction pattern K, so that the observation plate 51 is moved in the optical axis direction (Z direction). The size and the amount of light of the diffraction pattern K projected on the observation plate 51 are set to appropriate ones by moving to the observation plate 51.

Specifically, the observation plate 51 is replaced by the observation plate 51.
While looking at the diffraction pattern K projected on, the position adjustment mechanism 52 moves the optical axis direction to adjust the position of the observation plate 51 to a position where the diffraction pattern K has a good light amount and a large size.

Therefore, by moving the observation plate 51, a good diffraction pattern K can be projected on the observation plate 51, and the position of the imaging lens 5 can be adjusted more accurately.

In this case, the position adjusting mechanism 52 moves the observation plate 51 only in the optical axis direction (Z direction), but the position adjusting mechanism 52 is not limited to the optical axis direction, and the shift direction (X direction, Y direction). ), And in the tilt direction (Xθ direction, Yθ direction), the projection state of the diffraction pattern K projected on the observation plate 51 can be further improved.

In addition, in the present embodiment, the observation plate 5
Although the case where 1 is formed of a single member has been described, the observation plate 51 is not limited to that formed of a single member, and is provided for each projected diffraction pattern K individually. May be. In this case, a position adjusting mechanism is provided for each observation plate, and for example, the observation plate that projects the diffraction pattern K at the position of the point 51a has points 51b, 5 in the optical axis direction.
The observation plate for projecting the diffraction pattern K at 1c is moved in the directions of the adjusted virtual incident view angle lines Jib and the adjusted virtual exit view angle lines Job to further improve the projection state of all the diffraction patterns K. You can

As described above, since the position adjustment of the imaging lens 5 is performed using the diffraction pattern K projected on the observation plate 51, the position adjustment accuracy of the imaging lens 5 depends on the projection state of the diffraction pattern K. Will be affected.

Then, only by adjusting the position of the observation plate 51, the projection state of the diffraction pattern K when the image forming lens 5 for adjusting the position is installed is deteriorated, and the range of the image forming lens 5 whose position can be adjusted is limited. Will be done.

Therefore, in the present embodiment, by adjusting the opening diameters of the small holes 42a to 42c of the pinhole 42 as well, the light quantity and size of the diffraction pattern K are adjusted, and position adjustment is performed. The applicable range of the image lens 5 is widened.

Specifically, the pinhole 42 is provided so that the light quantity and size of the diffraction pattern K become a desired light quantity and size while observing the diffraction pattern K projected on the observation plate 51. Small holes 42a to 42 due to the variable opening diameter mechanism
Adjust the opening diameter of c.

In the present embodiment, the adjustment of the opening diameters of the small holes 42a to 42c of the pinhole 42 and the position adjustment of the observation plate 51 are performed by changing the projection state of the analysis pattern K projected on the observation plate 51. By observing and performing both adjustments at the same time while keeping a balance, the light quantity and size of the diffraction pattern K can be adjusted to a wider range and to an appropriate value.

Therefore, the position adjustment of the imaging lens 5 can be further improved, and the reading accuracy of the document reading device 1 can be further improved.

The opening diameter changing mechanism may be one that changes all the opening diameters of the small holes 42a to 42c at the same time as in the third embodiment, or each of the small holes 42a to 42c.
The opening diameter of 2c may be individually changed. Further, the aperture diameter varying mechanism may be capable of adjusting not only the aperture diameters of the small holes 42a to 42c but also the shapes of the small holes 42a to 42c. In this case, the light amount and the size of the diffraction pattern K can be adjusted. Can be adjusted over a wider range.

In the present embodiment, the light quantity and size of the diffraction pattern K are adjusted by adjusting the position of the observation plate 51 and the opening diameters of the small holes 42a to 42c of the pinhole 42. However, the present invention is not limited to these, and other factors that determine the light quantity and size of the diffraction pattern K, for example, the light quantity of the laser light sources 21a and 21b, the pinhole 41.
It may be performed by adjusting the position of or the opening diameter of the small holes 41a to 41c, and the like. If these adjustments are also performed, the adjustment range of the light quantity and size of the diffraction pattern K can be further widened.

14 and 15 are views showing a fifth embodiment of the position adjusting device for the image forming lens, the position adjusting method for the image forming lens, and the document reading device according to the present invention. A main member of the position adjusting device is installed on the adjustment table, and a position restricting member for restricting the position of the document reading device is provided on the adjustment table to adjust the positions of the imaging lenses of many document reading devices. It is intended to improve work efficiency and corresponds to claim 3.

This embodiment is applied to the same document reading device and position adjusting device as those of the above-mentioned fourth embodiment, and the same reference numerals are given to the same components as those of the fourth embodiment. Will be attached and detailed description thereof will be omitted.

In FIG. 14 and FIG. 15, the position adjusting device 60 sandwiches the base 3 of the document reading device 1 on which the imaging lens 5 is placed, and the laser light sources 21a and 2a are provided on the incident side thereof.
1b and a pinhole 41, and an observation plate 51 and a pinhole 42 are arranged on the emission side thereof.

Laser light sources 21a and 21b, pinhole 4
1, 42 and the observation plate 51 are the position adjusting mechanism 43, respectively.
a, 43b, 44, 45, 52, and the pinhole 41 and the pinhole 42 have three small holes 41 through which the laser light passes, as in the fourth embodiment.
a, 41b and five small holes 42a to 42c are formed.

Laser light sources 21a and 21b, pinhole 4
1, 42 and the observation plate 51 are position adjusting mechanisms 43a, 43.
The adjusted virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident angle of view line Jib, and the adjusted virtual outgoing angle of view line J on the adjustment table 61 via b, 44, 45, and 52.
After the coarse adjustment of the ob, the position adjustment mechanism 43
The position is accurately adjusted by a, 43b, 44, 45 and 52.

As shown in FIG. 14, on the adjustment table 61, pins (positioning means) 62a and 62b for restricting the position of the base 3 of the document reading apparatus 1 are provided.
It is fixed so as to project from the pins 62a, 62
b is arranged at a position spaced apart by a predetermined distance so as to coincide with the adjusted virtual incident optical axis Jia and the adjusted virtual outgoing optical axis Joa.

As shown in FIG. 15, the base 3 of the document reading apparatus 1 is formed with holes 3a and 3b into which the pins 62a and 62b are removably inserted so as to be in close contact with each other. When the position of the imaging lens 5 is adjusted, the pins 3 62 a and 62 b are inserted into the holes 3 a and 3 b to regulate the position of the base 3 and set the base 3 on the adjustment table 61.

According to this embodiment, when the position of the image forming lens 5 of the first document reading apparatus 1 is adjusted, the base 3 is adjusted while the pins 62a and 62b are inserted into the holes 3a and 3b. It is installed on the table 61, and then the laser light sources 21a and 21b, the pinholes 41 and 42, and the observation plate 5 are installed.
1 as described above, the position adjusting mechanisms 43a, 43b, 4
The adjustment virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident angle-of-view line Jib, and the adjusted virtual outgoing angle-of-view line Job are roughly adjusted and installed on the adjustment table 61 via 4, 45, and 52. After that, the position adjusting mechanism 43a, 43
Accurate position adjustment by b, 44, 45, 52.

In this case, the projection state of the diffraction pattern K projected on the observation plate 51 can be adjusted by the method shown in the third embodiment or the fourth embodiment.

When the setting and adjustment of the position adjusting device 60 is completed, the imaging lens 5 is attached to the base 3 via the lens block 4 (see FIGS. 3 and 8), and the same operation as in the first embodiment is performed. The position of the imaging lens 5 is adjusted.

When the position adjustment of the image forming lens 5 of the first original reading device 1 is completed, the position adjusting device 60 on the adjustment table 61 is maintained as it is, and the image forming lens 5 is maintained.
Of the document reading device 1 whose position adjustment has been completed on the adjustment table 6
In order to adjust the imaging lens 5 of the original reading device 1 of the same type or to readjust the imaging lens 5 of the original reading device 1 that has been once adjusted in the past, the adjustment is performed. Similarly to the above, the base 3 of the document reading apparatus 1 to be performed is positioned by inserting the pins 62a and 62b into the holes 3a and 3b of the base 3 and set on the adjustment table 61.

When the base 3 is installed on the adjustment table 61 in this way, the laser light source 21 of the adjustment device 60 is installed.
a, 21b, pinholes 41, 42 and observation plate 51 are
Properly aligned and the base 3 has pins 6
Since the position is regulated to an appropriate position by 2a and 62b, the position of the imaging lens 5 can be adjusted without performing the adjusting operation again.

Therefore, when adjusting the position of the imaging lens 5 of the same type of original reading device 1, the original reading device 1 is installed on the adjustment table 61, and the position of the imaging lens 5 is efficiently adjusted. Adjustment can be performed, and the position adjusting device 50 can be easily set when adjusting the positions of the imaging lenses 5 of many document reading devices 1.

As a result, the work efficiency of the position adjustment work of the imaging lens 5 can be improved.

Further, in this embodiment, since the pinholes 41 and 42 are installed on the adjustment table 61, the position of the pinholes 22 and 23 is regulated on the base 3 in the first embodiment. Pin 2 provided for
6a-26c, 27a-27c can be deleted,
It is possible to reduce the number of parts of the base 3, and eventually the document reading apparatus 1.

In this embodiment, the adjustment table 61 is provided with the pins 62a and 62b so that the pin 62
By inserting a and 62b into the holes 3a and 3b of the base 3, the position of the base 3, and by extension, the document reading device 1 is regulated, but the position of the document reading device 1 is regulated by the base 3
Is not limited to the one that regulates the position of the
The position of the document reading apparatus 1 may be regulated by another member formed as a constituent member of the document reading apparatus 1 when the position adjustment is performed.

Next, a sixth embodiment of the image-forming lens position adjusting apparatus, the image-forming lens position adjusting method, and the document reading apparatus according to the present invention will be described.

In the present embodiment, the components and components other than the components and components of the document reading device that hinder the position adjustment of the imaging lens are assembled to the document reading device before adjusting the position of the imaging lens. Claims 7 and 8
It corresponds to.

That is, in each of the above embodiments,
Although it has been described that the position of the image forming lens 5 is adjusted in a state where the parts and members unnecessary for the position adjustment of the image forming lens 5 are removed, in reality, the mechanical system of the document reading device 1, the optical system 14, and It is customary to assemble components and members such as electrical components and adjust the position of the imaging lens 5 in a state close to a finished product as the document reading device 1. However, if an attempt is made to adjust the position of the imaging lens 5 after being assembled in a state close to the finished product, the laser light is blocked by the constituent members or parts of the document reading apparatus 1, or in the case of the first embodiment. May run out of places to install the pinholes 22, 23.

In such a case, the constituent members and components of the position adjusting devices 20, 40, 50 and 60 necessary for adjusting the position of the imaging lens 5 are necessary for adjusting the position of the imaging lens 5, and The members that need to be assembled to the document reading apparatus 1 are assembled before the position adjustment of the imaging lens 5 and are not necessary for the position adjustment of the imaging lens 5, or they are an obstacle to the position adjustment of the imaging lens 5. These members and parts are mounted on the document reading device 1 after the position of the imaging lens 5 is adjusted.

Specifically, for example, in the first embodiment, the imaging lens 5, the pinholes 22 and 23 are used as the minimum components and members necessary for adjusting the position of the imaging lens 5. Assemble to the base 3 before entering the adjustment process of 5,
After adjusting the position of the imaging lens 5 as described above,
All the remaining parts and members are assembled to the document reading device 1.

By doing so, a series of document reading devices 1
The assembling work and the position adjustment work of the imaging lens 5 can be smoothly performed, and the position adjustment accuracy of the imaging lens 5 can be improved.

In this case, parts and members that do not interfere with the position adjustment of the imaging lens 5 may be attached at any of the above-mentioned stages, but they are assembled as much as possible before the position adjustment of the imaging lens 5.

A seventh embodiment of the image-forming lens position adjusting apparatus, the image-forming lens position adjusting method, and the document reading apparatus according to the present invention will be described below.

In this embodiment, before adjustment of the imaging lens,
As many components and constituent members as possible are assembled into the document reading device, and they correspond to claims 9 and 10.

In the assembling procedure of the document reading apparatus 1 and the position adjusting procedure of the image forming lens 5, the members or parts which are unnecessary or obstructive to the position adjusting of the image forming lens 5 are the same as those of the image forming lens 5. Although it is assembled to the document reading device 1 after the position adjustment, this may deteriorate the position adjustment accuracy of the imaging lens.

Therefore, before adjusting the position of the imaging lens 5, a member that interferes with the position adjustment of the imaging lens 5 can be attached or detached, or a structure that is assembled to a position that does not interfere with the position can be provided. After assembling most of the components and components of the document reading apparatus 1, the position of the imaging lens 5 is adjusted.

That is, the mirror 7, the CCD 6 and the imaging lens 5 which interfere with the adjustment of the position of the imaging lens 5 are detachably assembled, and the other members and parts are shaped so as not to interfere with the assembly thereof. In addition to the configuration, the configuration and the shape are such that the laser light at the time of adjusting the position of the imaging lens 5 is not blocked.

Then, for example, in the case of the first embodiment, the pinholes 22 and 23 are attached to the position adjusting device 20 with the mirror 7, CCD 6 and imaging lens 5 not attached. After adjusting the positions of 40, 50 and 60 and the position of the image forming lens 5 and completing the position adjustment of the image forming lens 5, the mirror 7 and the CCD 6 are assembled.

By doing so, a series of document reading devices 1
The assembly work and the position adjustment work of the imaging lens 5 can be performed smoothly, and after the position adjustment of the image formation lens 5 is performed as described above, most of the components and constituent members of the document reading apparatus 1 are removed. The position adjustment accuracy of the imaging lens 5 can be further improved as compared with the case of mounting.

That is, when most other components and constituent members of the document reading device 1 are assembled after the position of the imaging lens 5 is adjusted, the document reading device 1 is distorted by the load and external force at the time of assembly. This is because there is a risk that the image forming lens 5 may be displaced during actual use.

However, as described above, if most of the components and components are assembled and then the position of the imaging lens 5 is adjusted, distortion due to the load of these components and components and external force at the time of assembly is generated. The position of the imaging lens 5 can be adjusted in this state, and the position of the imaging lens 5 can be adjusted in a state close to that in actual use. As a result, the positional accuracy of the imaging lens 5 can be improved.

Next, an eighth embodiment of the image-forming lens position adjusting device, the image-forming lens position adjusting method, and the document reading device according to the present invention will be described.

In this embodiment, an opening for passing the laser light is formed in a component of the document reading device which shields the laser light when adjusting the position of the laser light.
It corresponds to.

That is, in the case of the seventh embodiment,
A component and a component of the document reading device 1 that shields a laser beam when the position of the imaging lens 5 is adjusted.
In order to prevent other members other than the CD 6 and the imaging lens 5 from blocking the laser beam when adjusting the position of the imaging lens 5, a large hole or a relief portion may be formed, or the constituent member may be omitted. However, the rigidity and accuracy of the main body of the document reading device 1 may be deteriorated, and further, the function of the document reading device 1 may be deteriorated.

Therefore, in such a case, a member that shields the laser beam when the position of the imaging lens 5 is adjusted, for example, a side plate or a mirror 7 provided outside the pinholes 22 and 23 of the document reading apparatus 1 in FIG. This can be dealt with by forming an opening of a holding member or the like for holding the laser beam of a size sufficient and sufficient for passing the laser light. As the opening, for example, one having a diameter of 3 to 5 mm is sufficient.

By thus forming an opening of a size sufficient for passing laser light, the imaging lens 5
By ensuring the passage of laser light when adjusting the position of
Reduction in rigidity and accuracy of the document reading device 1 and document reading device 1
It is possible to adjust the position of the imaging lens 5 of the document reading device 1 with high accuracy in a state where most of the components and components are assembled without degrading the function of.

Although the invention made by the present inventor has been specifically described based on the preferred embodiments, the present invention is not limited to the above, and various modifications can be made without departing from the scope of the invention. It goes without saying that it is possible.

For example, in each of the above embodiments, T
Although the position adjustment of the imaging lens 5 in the plane has been described, the position adjustment is not limited to the T plane, but the R plane or the T plane.
Adjustments in both the in-plane and R-plane can be similarly applied.

Further, in the above-mentioned respective embodiments, the pinholes 22, 23, 41 and 42 are provided with the small openings 22.
a-22c, 23a-23c, 41a-41c, 42a
However, the shape of the minute opening is not limited to the circular small hole, and may be, for example, a rectangular shape or a vertically or horizontally long slit.

Furthermore, the pinholes 22, 23, 41, 4
2 is one pinhole 22, 23, 41, 4 respectively
2 small holes 22a-22c, 23a-23c, 41a-4
1c and 42a to 42c are formed, the shape of the pinhole is not limited to this, and for example, each small hole 22a is formed.
-22c, 23a-23c, 41a-41c, 42a-
You may form a pinhole for every 42c.

In each of the above embodiments, the ideal adjusted virtual incident optical axis Jia, the adjusted virtual outgoing optical axis Joa, the adjusted virtual incident angle-of-view line Jib, and the adjusted virtual outgoing that are imaginarily set in the main body of the document reading apparatus 1 are used. The position adjusting devices 20, 40, 50, and 60 are used to adjust the optical axis C of the imaging lens 5 and the angle-of-view lines H1 and H2 so as to match or substantially match the angle-of-view line Job. The degree of matching, that is, the adjustment accuracy, is the original reading device 1 that is the adjustment target.
It is appropriately set according to the performance and specifications of the.

Furthermore, in each of the above embodiments, the case where the position of the imaging lens 5 is adjusted by projecting the diffraction pattern K on the observation plates 24 and 51 has been described, but the diffraction pattern K is projected. Is an observation plate 24,
The number is not limited to 51 and may be projected on a light receiving monitor such as a CCD camera. In this case, a display for displaying the diffraction pattern K on the light receiving monitor (for example,
CRT (Cathode Ray Tube) and LCD (Liqu
id Crystal Display) and the like), and while adjusting the light quantity and size of the diffraction pattern K and adjusting the position of the imaging lens 5 while watching the diffraction pattern K displayed on the display. Further, in this case, if an analyzing device that analyzes the state of the diffraction pattern K is connected to the light receiving monitor and the analyzing device adjusts the light amount and size of the diffraction pattern K and the position of the imaging lens 5, it becomes more effective. More accurate adjustments can be made.

In each of the above embodiments, the case where the position adjusting devices 20, 40, 50 and 60 are applied to the position adjustment of the imaging lens 5 of the document reading device 1 has been described, but it is limited to the document reading device. However, the present invention can be applied to all high-quality and high-precision devices that use an imaging lens.

[0212]

According to the position adjusting device of the image forming lens of the invention described in claim 1, since the light flux regulating member and the image forming lens are arranged on the same component member, the adjustment virtual angle of view line can be adjusted. The setting accuracy can be improved, the adjustment accuracy when adjusting the position of the imaging lens can be improved, and the position adjustment accuracy of the imaging lens can be improved.

According to the image-lens position adjusting device of the second aspect of the invention, the position of the image-forming lens can be adjusted not only with respect to the angle of view line but also with respect to the optical axis.
The position adjustment accuracy of the imaging lens can be further improved.

According to the image-lens position adjusting device of the third aspect of the invention, at least the wave light illuminating means of the components of the image-lens position adjusting device is installed once on the position-adjusting table. If the position adjustment is performed by adjusting the position, the position adjustment of the wave light illumination means does not need to be performed again when the position adjustment of the image forming lens of the document reading apparatus equipped with the image forming lens having the same characteristics is performed, and the image forming is performed. Since the fixing member to which the holding member for holding the lens is fixed can be installed on the same position adjusting table with its position regulated, the image forming lens emits the adjusting virtual optical axis and the adjusting virtual angle of view of the wave light illumination means. It can be installed with some adjustment to the line. As a result, the position adjustment of the imaging lens can be performed more accurately, and the work efficiency of the position adjustment work of the imaging lens can be improved.

According to the position adjusting device of the image forming lens of the invention described in claim 4, the projection distance from the minute opening of the light flux regulating member to the pattern display means is adjusted, and the diffraction pattern displayed on the pattern display means. Can be displayed in an appropriate state, and the adjustment state of the imaging lens can be clearly understood. As a result, the position adjustment accuracy of the imaging lens can be improved.

According to the position adjusting device of the image forming lens of the fifth aspect, the display state of the diffraction pattern displayed on the pattern display means is adjusted by adjusting the size and shape of the minute opening of the light flux regulating member. Can be made appropriate, and the adjustment state of the imaging lens can be clearly understood. As a result, the position adjustment accuracy of the imaging lens can be improved.

According to the document reading device of the sixth aspect, it is possible to prevent the fixing member of the document reading device on which the holding member holding the imaging lens is mounted from being bent by the load of the imaging lens. The position accuracy of the imaging lens before and after the position adjustment can be improved. As a result, the reading accuracy of the document reading device can be improved.

According to the position adjusting method of the image forming lens of the seventh aspect of the present invention, the component parts and the component members other than the component parts and the component members of the document reading device which hinder the position adjustment of the image forming lens. Since it is assembled to the original reading device before adjusting the position of the imaging lens, the position adjustment work of the imaging lens can be performed efficiently, and the components and components of the original reading device can be assembled. It is possible to reduce the distortion of the document reading device due to external force and the load at the time, to reduce the distortion of the document reading device before and after the position adjustment of the imaging lens, and to improve the reading accuracy of the document reading device. .

According to the document reading device of the present invention, the components other than the components or the members of the document reading device which obstruct the position adjustment of the image forming lens are formed by the image forming lens. Since it is assembled to the document reading device before the position adjustment of the document reading device, the position adjustment work of the imaging lens can be efficiently performed, and the external force at the time of assembling the components and components of the document reading device can be improved. It is possible to reduce the distortion of the original reading device due to these loads, reduce the distortion of the original reading device before and after the position adjustment of the imaging lens, and improve the reading accuracy of the original reading device.

According to the position adjusting method of the image forming lens of the ninth aspect of the present invention, more component parts than the component parts of the document reading device and the component members for shielding the wave light when the position of the image forming lens is adjusted, and Since the constituent members can be assembled to the document reading device before adjusting the position of the imaging lens,
The position adjustment work of the imaging lens can be efficiently performed, and the external force when assembling the components and components of the document reading device and the distortion of the document reading device due to these loads are reduced to form an image. The distortion of the document reading device before and after the lens position adjustment can be further reduced, and the reading accuracy of the document reading device can be further improved.

According to the document reading device of the tenth aspect of the invention, more components and components than the components and components of the document reading device that shield the wave light when adjusting the position of the imaging lens are provided. Since it can be assembled to the document reading device before the position adjustment of the imaging lens, the position adjustment work of the imaging lens can be efficiently performed, and
It is possible to further reduce the distortion of the document reading device before and after the position adjustment of the imaging lens by further reducing the distortion of the document reading device due to the external force at the time of assembling the components and components of the document reading device and these loads. Therefore, the reading accuracy of the document reading device can be further improved.

According to the document reading device of the eleventh aspect of the present invention, more components and components than the components and components of the document reading device which hinder the position adjustment of the imaging lens. Before adjusting the position of the imaging lens,
Since it can be assembled to the document reading device, the position adjustment work of the imaging lens can be efficiently performed, and the position adjustment of the imaging lens can be performed in a state where the document reading device is close to a finished product. It is possible to further reduce the distortion of the document reading device before and after the adjustment of the position of the imaging lens and further improve the reading accuracy of the document reading device.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an original reading device to which a first embodiment of an image forming lens position adjusting device, an image forming lens position adjusting method, and an original reading device according to the present invention are applied.

FIG. 2 is a plan view of the imaging lens portion of the document reading apparatus of FIG. 1 viewed from the T surface.

FIG. 3 is a side view of the image forming lens of the image forming lens of the document reading apparatus of FIG.

4 is a plan view of the image forming lens of the image forming lens of the document reading apparatus of FIG.

5 is a plan view of the base of the document reading apparatus of FIG.

FIG. 6 is a schematic diagram of a normal diffraction pattern projected on an observation plate.

FIG. 7 is a schematic diagram of a diffraction pattern projected on an observation plate in an abnormal state.

FIG. 8 is a main part of a document reading device and a focusing lens position adjusting device to which a second embodiment of a focusing lens position adjusting device, a focusing lens position adjusting method, and a document reading device according to the present invention is applied. Side view of the imaging lens of FIG.

9 is a plan view of the base of FIG.

FIG. 10 is an image forming operation of an image forming lens position adjusting apparatus, an image forming lens position adjusting method, and an original reading apparatus according to a third embodiment of the present invention. The side view seen from the R surface of a lens.

11 is a plan view of the image forming lens of the document reading device and the image forming lens position adjusting device of FIG.

FIG. 12 is an image forming operation of an image forming lens position adjusting apparatus, an image forming lens position adjusting method, and an original reading apparatus according to a fourth embodiment of the present invention. The side view seen from the R surface of a lens.

13 is a plan view of the image forming lens of the document reading apparatus and the image forming lens position adjusting apparatus of FIG.

FIG. 14 is an image forming operation of an imaging lens position adjusting device, an imaging lens position adjusting method, and an original reading device according to a fifth embodiment of the present invention. The side view seen from the R surface of a lens.

15 is a plan view of the image forming lens of the document reading apparatus and the image forming lens position adjusting apparatus of FIG.

[Explanation of symbols]

1 Document Reader 2 Body Case 3 Base 3a, 3b Hole 4 Lens Block 4a, 4b Hole 5 Imaging Lens 6 CCD 7 Mirror 8 Cold Mirror 9 Light Source 10 Carriage 11 Contact Glass 12 Pressing Glass 13 Original 14 Optical System 20, 40, 50, 60 Position adjusting device 21a, 21b Laser light source 22, 23, 41, 42 Pinhole 22a, 22b, 23a, 23b, 41a, 41b, 4
2a to 42c Small holes 22c to 22e, 23c to 23e Holes 24, 51 Observation plates 25a, 25b, 26a to 26c, 27a to 27c Pins 30 Channels 31 Parallel channels 32 Vertical channels 43a, 43b, 44, 45, 52 Position adjustment mechanism 51a to 51c Points 61 Adjustment table 62a, 62b Pin A Luminous flux B Optical axis of luminous flux C Optical axis of imaging lens H1 to H4 Angle of view line of imaging lens G1, G2, I1, I2 Angle of view line of light flux Da, Db Laser optical axis K Diffraction pattern Jia Adjusted virtual incident optical axis Joa Adjusted virtual outgoing optical axis Jib Adjusted virtual incident angle of view line Job Adjusted virtual outgoing angle of view line

Claims (11)

[Claims] 1. A document is illuminated by an illuminating means, a light flux containing read information of the document is introduced into an image forming lens held through a predetermined holding member, and the image forming lens connects the light to the light receiving means. In a position adjusting device for an image forming lens of an original reading device for forming an image and reading the read information of the original, in at least one of a tangential surface and a radial surface of an optical system including the image forming lens, A wave light illuminating means which is disposed on an adjustment virtual field angle line of the effective light flux on one side of the entrance and exit of the imaging lens and emits the wave light; and the wave light illumination with the imaging lens interposed therebetween. Is disposed on at least one of the tangential surface and the radial surface on the side opposite to the means, on the adjusted virtual angle of view line of the effective light flux of the imaging lens, and from the wave light irradiation means. Emitted A light flux regulating member having a minute opening for regulating the wave light, pattern display means for receiving and displaying a diffraction pattern of the wave light generated by the light flux regulating member, and a position of the imaging lens with respect to an incident light flux An image forming lens adjusting means for adjusting the image forming lens, and at least the holding member for holding the light flux restricting member and the image forming lens are arranged on the same constituent member of the document reading device, A position adjusting device for an image forming lens, wherein the position of the image forming lens is adjusted by the image forming lens adjusting means based on the displayed diffraction pattern. 2. A position adjusting device for the image forming lens, a wave light illuminating means for emitting wave light on an adjustment virtual optical axis on one side of the entrance and exit of the image forming lens, and the wave light illuminating means. And a light flux regulating member having a minute opening for regulating the wave light emitted from the wave light illuminating means on the adjustment virtual optical axis of the imaging lens on the opposite side thereof. The position adjusting device for an image forming lens according to claim 1. 3. A document is illuminated by an illuminating means, a light flux containing read information of the document is introduced into an image forming lens held by a predetermined holding member, and the image forming lens connects the light to the light receiving means. In a position adjusting device for an image forming lens of an original reading device for forming an image and reading the read information of the original, in at least one of a tangential surface and a radial surface of an optical system including the image forming lens, A wave light illuminating means which is disposed on an adjustment virtual field angle line of the effective light flux on one side of the entrance and exit of the imaging lens and emits the wave light; and the wave light illumination with the imaging lens interposed therebetween. Is disposed on at least one of the tangential surface and the radial surface on the side opposite to the means, on the adjusted virtual angle of view line of the effective light flux of the imaging lens, and from the wave light irradiation means. Emitted A light flux regulating member having a minute opening for regulating the wave light, pattern display means for receiving and displaying a diffraction pattern of the wave light generated by the light flux regulating member, and a position of the imaging lens with respect to an incident light flux And an imaging lens adjusting means for adjusting, and at least the wave light illuminating means is installed,
A position adjusting table, which is a constituent member of the document reading device and at least a fixing member for fixing the holding member that holds the imaging lens, is detachably installed; The original document is located at a position where the optical axis of the wave light emitted from the light illuminating means coincides with or substantially coincides with the adjusted virtual optical axis of the imaging lens or the adjusted virtual field angle line of the effective light flux of the imaging lens. Positioning means for positioning the fixing member of the reading device is provided, and the position of the imaging lens is adjusted by the imaging lens adjusting means based on the diffraction pattern displayed on the pattern display means. Image lens position adjustment device. 4. A position adjusting device for the imaging lens, wherein the light flux regulating member is positioned in an adjusting virtual optical axis direction of the imaging lens or in an adjusting virtual angle-of-view line direction of the effective light beam of the imaging lens. Pattern position adjustment for adjusting the position of the light flux regulating member for adjusting and the pattern display means in the direction of the adjusted virtual optical axis of the imaging lens or in the direction of the adjusted virtual angle of view line of the effective light beam of the imaging lens. 4. A position adjusting means of at least one of the means is further provided to adjust a projection distance from the minute opening of the light flux regulating member to the pattern display means. A position adjusting device for an image forming lens according to item 1. 5. The light flux regulating member is provided with aperture varying means for adjusting at least one of the size and the shape of the minute aperture, and the light flux regulating member according to claim 1. Position adjusting device for the image forming lens. 6. An original reading device in which the position of the image forming lens is adjusted by the position adjusting device of the image forming lens according to any one of claims 1 to 5, and the image forming lens is held. Of the fixing member of the document reading device in which the holding member is installed, at least a portion in which the holding member is installed or a peripheral part thereof is reinforced by a reinforcing member having a predetermined rigidity. Document reader. 7. A method for adjusting the position of an imaging lens, wherein the position of the imaging lens is adjusted by using the position adjusting device for the imaging lens according to any one of claims 1 to 5. Among the constituent parts and constituent members of the document reading apparatus, the constituent parts and constituent members other than the constituent parts and the constituent members that become obstacles when adjusting the position of the imaging lens are The position of the imaging lens, which is characterized in that it is assembled to the document reading device before performing the position adjustment, and the position of the imaging lens is adjusted, and then the obstructing component and the component are assembled. Adjustment method. 8. A document reading device in which the position of the image forming lens is adjusted by the position adjusting device of the image forming lens according to any one of claims 1 to 5, Of the constituent parts and constituent members, the position adjustment of the imaging lens is performed with the constituent parts and the constituent members other than the constituent parts and the constituent members that are obstacles in the position adjustment of the imaging lens being assembled. The document reading apparatus is characterized in that, after the position adjustment of the imaging lens, the obstacle and the component are assembled. 9. A position adjusting method of an image forming lens, which adjusts the position of the image forming lens using the position adjusting device of the image forming lens according to claim 1. Description: Among the constituent parts and constituent members of the document reading apparatus, the constituent parts and the constituent members that become obstacles when the position of the imaging lens is adjusted, and the wave light emitted from the wave light illumination means is The component for shielding light or the component is configured to be detachable, and is removed when the position of the imaging lens is adjusted, and the component that becomes an obstacle when adjusting the position of the imaging lens or The imaging lens with the constituent member having a shape and a structure capable of avoiding the obstacle, together with a constituent component and a component other than the constituent component that obstruct the position adjustment. Prior to adjusting the position of the image forming apparatus, and after adjusting the position of the image forming lens, the removed component or the component is assembled. Position adjustment method. 10. A document reading device in which the position of the image forming lens is adjusted by the position adjusting device for the image forming lens according to any one of claims 1 to 5, wherein: Of the constituent parts and constituent members, the constituent parts and the constituent members that are obstacles in the position adjustment of the imaging lens, and the constituent parts or the constituent parts that shield the wave light emitted from the wave light illumination means. The member has a detachable structure, and the member is removed when performing the position adjustment, and the component or the component that causes an obstacle in the position adjustment of the imaging lens has a shape and a configuration that can avoid the obstacle. , The original reading before adjusting the position of the imaging lens together with the component and the component other than the component that obstruct the position adjustment. An original reading apparatus, characterized in that after the assembly device is assembled and the position of the imaging lens is adjusted, the detached component parts and component members are assembled. 11. An original reading device in which the position of the imaging lens is adjusted by the position adjusting device of the imaging lens according to any one of claims 1 to 5, Among the constituent parts and constituent members, the constituent parts and the constituent members that become obstacles when the position of the imaging lens is adjusted, and the constituent parts that shield the wave light emitted from the wave light illumination means or An original reading device, wherein an opening having a size equal to or larger than a luminous flux width of the wave light is formed in the constituent member, and the opening is formed in the original reading device before adjusting the position of the imaging lens.