JPH0534552A - Fitting device for read lens - Google Patents

Abstract

PURPOSE:To miniaturize the structure of a scanner part in a mirror scanning type by centralizing and arranging the focus adjustment mechanism and the fixing mechanism of a read lens at the lower part thereof. CONSTITUTION:A focus adjustment mechanism 103 and the fixing mechanism are centralized and disposed at the lower part of the read lens 100 with respect to the lens 100 mounted in the V-shaped groove of a lens receiving table 110. Then, the focus of the lens 100 is adjusted by rotating the adjustment screw 130 of the adjustment mechanism 103 and moving the lens 100 in an optical axis direction together with a slider 116. At the adjustment position thereof, the lens 100 is fixed and held by the coupling of the screw of the adjustment mechanism 103 and the pressing of the fixing band 113 of the fixing mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading lens mounting device installed immediately before an image reading plate in an optical reading system such as a copying machine, and more particularly to a focus adjusting mechanism and a fixing mechanism for the reading lens.

[0002]

2. Description of the Related Art Generally, a copying machine is provided with an optical reading system for optically reading the contents of a document. Conventionally,
This optical reading system, for example, as shown in FIG.
The exposure lamp 1102, the reflection plate 1103, and the first mirror 110 are provided directly below the contact glass 1101 on which the wafer is mounted.
4 having a first scanner 1105 and a second mirror 110
6, a second scanner 1108 having a third mirror 1107
And are movably attached. Also, the third mirror 11
The image reading plate 101 is arranged on the optical axis H from 07 via the reading lens 100, and the first and second scanners 110
Reference numerals 5 and 1108 scan the document G, and the read lens 100 forms an image on the image reading plate 101 by the reading lens 100 and reads the image.

On the other hand, in such an optical reading system,
The accuracy of forming an image on the image reading plate 101 by the reading lens 100 directly affects the reading accuracy, but individual differences occur due to the accuracy of each component, assembly error, and the like. Therefore, in order to adjust such an individual difference to properly focus the reading lens 100, the reading lens is provided with a focus adjusting and fixing mechanism.

A conventional focus adjusting mechanism for the reading lens is described in, for example, Japanese Utility Model Laid-Open No. 62-109127.
It is disclosed that a cover for holding a lens alone in the optical axis direction is movably provided on an upper portion of a pedestal of a mold, and the position of the cover is adjusted to focus and fix the cover. Further, Japanese Utility Model Laid-Open No. 63-99455 discloses that a fixing screw is provided on an upper portion of a light shielding plate that covers the lens holder, and the lens holder is fixed to the base plate by the fixing screw.

[0005]

However, in the above-mentioned prior art, since the focus adjusting mechanism and the fixing mechanism of the reading lens are provided above the lens, the first scanner as shown in FIG. When applied to a configuration in which the scanner scans above the reading lens and the image reading plate, it is necessary to widen the distance between the optical axis of the first scanner and the optical axis of the lens so as not to interfere with the focus adjustment mechanism and the like. There is. For this reason,
There has been a problem that the space between the second mirror and the third mirror is required to be increased and the size of the second scanner becomes large.

The present invention has been made in view of this point, and it is an object of the present invention to centrally arrange the focus adjusting mechanism and the fixing mechanism of the reading lens in the lower part thereof to reduce the size of the mirror scanning type scanner unit. And

[0007]

In order to achieve the above object, according to the present invention, a focus adjustment mechanism and a fixing mechanism are provided in a reading lens which is movably mounted in a V groove in the optical axis direction of a lens holder. In the reading lens mounting device, the focus adjustment mechanism includes a moving groove formed in the optical axis direction immediately below the V groove,
A slider that engages with a small diameter portion of the reading lens and is movably fitted into the V groove and the moving groove; Configured with an adjusting screw that moves the slider,
The fixing mechanism provides a reading lens mounting device including a fixing band to be hung on a small diameter portion of the reading lens and a screw for fastening the fixing band to the lens holder.

Further, the adjusting screw of the focus adjusting mechanism has an end portion rotatably attached to the slider so that the screw portion is fixed to a plate fixed to the lens pedestal side at the opening end portion of the moving groove. It is desirable to be screwed and projected to the opposite side of the image reading plate.

The adjusting screw of the focus adjusting mechanism has an end portion rotatably coupled to the lens pedestal side and a screw portion screwed to the slider so as to project to the opposite side of the image reading plate. It is desirable to be done.

An end of the adjusting screw of the focus adjusting mechanism is rotatably attached to the lens pedestal side, and a screw portion of the adjusting screw is screwed to the slider which is divided into two parts. It is desirable to project to the opposite side.

[0011]

Based on the above construction, the focus adjusting mechanism and the fixing mechanism are centrally arranged below the reading lens mounted in the V groove of the lens receiving table. Therefore, when the adjusting screw of the focus adjusting mechanism is rotated, the reading lens moves together with the slider in the optical axis direction to adjust the focus. At this adjusting position, the reading lens is coupled by screwing the focusing mechanism and pressing the fixing band of the fixing mechanism. Is held fixed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, the first embodiment of the present invention will be described. The reading lens 100 includes a lens pedestal 110.
The V-shaped groove 111 is regulated and inserted so as to be movable only in the direction of the optical axis H, and a fixing mechanism 102 and a focus adjusting mechanism 103 are provided below the reading lens 100. The fixing mechanism 102 has a small diameter portion 112 formed in the middle of the reading lens 100 in the axial direction, a fixing band 113 is hung on the small diameter portion 112, and both ends of the fixing band 113 are attached to the lens pedestal 110 by screws 114. It is configured to be fastened and fixed.

The focus adjustment mechanism 103 includes a lens pedestal 110.
Moving groove 1 formed in the optical axis H direction just below the V groove 111
The slider 116 is fitted in the V groove 111 and the moving groove 115. Further, the plate 11 is provided in the opening front part of the moving groove 115 on the side opposite to the image reading plate 101.
7 is fixed to the lens pedestal 110 with a screw 118, and is closed and installed. As shown in FIG. 4, the slider 116 has an engaging surface 119 having the same curvature as the small diameter portion 112 of the reading lens 100.
Is inserted so as to be movable while being engaged with the small diameter portion 112 of the reading lens 100, and a retaining groove 120 formed by combining a circle and a straight line is formed. Further, it has an adjusting screw 130 having a ball 131 at its end, and this adjusting screw 130 rotatably hangs the ball 131 on the retaining groove 120 of the slider 116, and the screw portion 132 is screwed onto the plate 117 to externally The reading lens 100 is arranged so as to protrude, and the reading lens 100 is moved by the rotation of the adjusting screw 130.

Next, the operation of this embodiment will be described. By slightly loosening the screw 114 of the fixing band 113, it is possible to move the reading lens 100 in the optical axis H direction while the reading lens 100 is engaged with the slider 116. become. Therefore,
When the adjusting screw 130 protruding to the opposite side of the image reading plate 101 is rotated in this state, the adjusting screw 130 moves back and forth with respect to the plate 117. At this time, adjust screw 1
The ball 131 at the end of 30 is the retaining groove 12 of the slider 116.
While idling at 0, the slider 116 is moved in association with the movement of the adjusting screw 130, and thus the reading lens 100 moves together with the slider 116. Therefore,
Focusing on the image reading plate 101 is performed by the forward / backward movement of the reading lens 100 by the adjusting screw 130, and the forward / backward direction of the reading lens 100 is fixed by the screw connection itself at the focused adjustment position. Then, when the screw 114 of the fixing band 113 is tightened, the reading lens 100 is pressed and brought into contact with the V groove 111 by the fixing band 113, and the reading lens 100 is also fixed in the vertical direction and held at that position.

A second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the reading lens 10
The zero fixing mechanism 102 is configured in the same manner as described above. on the other hand,
In the focus adjustment mechanism 103, a step portion 500 is provided at an end of the moving groove 115 on the image reading plate 101 side, and the retaining groove 120 is formed in the step portion 500. Further, a screw hole 501 is formed in the slider 116 that engages with the small diameter portion 112 of the reading lens 100, and the adjustment screw 130 is provided at the end of the ball 1.
31 is rotatably hung on the retaining groove 120 of the step 500,
The threaded portion 132 is directly screwed into the threaded hole 501 of the slider 116 and is projected to the outside as it is. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Therefore, in this embodiment, the adjusting screw 130 is held immovably by the engagement of the ball 131 and the retaining groove 120 of the step portion 500 and rotates, and at this time, the slider 116 and the reading lens 100, which are screwed together, move forward and backward. Move to and adjust to focus as well. Then, at the adjustment position, the focus adjustment mechanism 103 and the fixation mechanism 102 fix and hold the focus adjustment mechanism 103 and the fixation mechanism 102.

A third embodiment of the present invention will be described with reference to FIGS. 9 and 10. In this embodiment, most of the structure is similar to that of the second embodiment, the slider 116 is divided into two halves 901 and 902, and a screw hole 501 is formed in the joint surface of the halves 901 and 902. Is provided.
Therefore, in this embodiment, the two halves 901 and 902 are joined to each other and are fitted into the moving groove 115 to be read by the reading lens 100.
, And the threaded portion 132 of the adjusting screw 130 is screwed into the threaded hole 501, and the same operation as in the second embodiment is achieved. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

[0018]

As described above, according to the present invention,
In the reading lens installed in the optical reading system of the copying machine,
Since both the focus adjusting mechanism and the fixing mechanism are arranged under the lens, they do not interfere in the case of the mirror scanning type.
For this reason, the distance between the optical axis of the first scanner and the optical axis of the lens can be narrowed, whereby the second scanner can reduce the shape and the distance of the mirrors, and the size can be reduced. Since the reading lens and the slider are configured separately, workability and assembly are good. Since the focus adjustment mechanism is a screw type,
Since the adjusting screw itself can have a fixing function and the adjusting screw projects in the optical axis direction on the side opposite to the image reading plate, the operability of focusing is also good.

In the first embodiment, the slider is not affected by the rotational force of the screw coupling, and in the second embodiment, the adjusting screw does not move. Further, in the third embodiment, the screwing of the slider with the adjusting screw is facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a device for mounting a reading lens according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is an exploded perspective view of a main part of the reading lens attachment device shown in FIG. 1.

FIG. 5 is a perspective view showing a second embodiment of the reading lens mounting apparatus according to the present invention.

6 is a sectional view taken along line AA of FIG.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is an exploded perspective view of a main part of the mounting device for the reading lens shown in FIG.

FIG. 9 is a cross-sectional view showing a third embodiment of the reading lens mounting device according to the present invention.

FIG. 10 is an exploded perspective view of a main part of the reading lens mounting device shown in FIG.

FIG. 11 is a side view showing a schematic configuration of a conventional mirror scanning type optical reading system.

[Explanation of symbols]

100 reading lens 101
Image reading plate 102 Fixing mechanism 103
Focus adjustment mechanism 110 Lens pedestal 111
V-groove 113 Fixed band 114
Screw 115 Moving groove 116
Slider 120 retaining groove 130
Adjustment screw 131 Ball 132
Screw part 500 step part 501
Screw hole 901 902 Half body

Claims (4)

[Claims] 1. A reading lens mounting device in which a focus adjusting mechanism and a fixing mechanism are provided in a reading lens movably mounted in a V groove in the optical axis direction of a lens pedestal, wherein the focus adjusting mechanism includes a V groove. A moving groove formed in the optical axis direction immediately below,
A slider that engages with a small diameter portion of the reading lens and is movably fitted into the V groove and the moving groove; Configured with an adjusting screw that moves the slider,
An apparatus for mounting a reading lens, wherein the fixing mechanism includes a fixing band to be hung on a small diameter portion of the reading lens, and a screw for fastening the fixing band to the lens pedestal. 2. An adjusting screw of the focus adjusting mechanism has an end rotatably coupled to the slider so that the screw is fixed to a plate fixed to the lens pedestal side at an opening end of the moving groove. The device for mounting a reading lens according to claim 1, wherein the device is screwed to be projected to the opposite side of the image reading plate. 3. An adjusting screw of the focus adjusting mechanism has an end rotatably coupled to the lens pedestal side, and a screw portion screwed to the slider so as to project to the opposite side of the image reading plate. The mounting device for a reading lens according to claim 1, wherein the device is mounted. 4. An adjusting screw of the focus adjusting mechanism has an end portion rotatably coupled to the lens pedestal side so as to be rotatable, and a screw portion screwed to the slider divided into two parts so that an image reading plate The reading lens mounting device according to claim 1, wherein the mounting device is provided on the opposite side.