JPH0451210A - Method for mounting optical unit - Google Patents

Abstract

PURPOSE:To prevent the generation of the deformation and distortion of a frame of an optical unit and to prevent the misalignment of an optical axis by fixing two points among three points spaced from each other of the frame to a base frame and coupling the remaining one point to the base frame in such a manner that this point can be displaced within a microrange. CONSTITUTION:The transmission of the displacement and distortion of the frame 9 to the frame 21 can be shut off by the displacement of a supporting piece 43 within the microrange if the deformation and distortion arise in the frame 9 after an image reading part 3 is mounted to the base frame 9 and, therefore, the generation of the deformation and distortion of the frame 21 is prevented. The influence on the optical members, such as 1st mirror 15 and 2nd mirror 17, is eliminated and the misalignment of the optical axis is prevented. This method is applicable also to the mounting of the optical unit mounted to devices, such as copying machines and scanners or laser beam printers in addition to facsimiles.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for attaching an optical unit, and more particularly to a method for attaching a frame of an optical unit to a base frame.

(Prior Art) An optical member that is disposed in an optical path that guides a light beam corresponding to image information to a light receiving means and determines the course of the light or the convergence and diffusion of the light, and a frame that supports the optical member. In the optical unit provided, it is desirable that the frame be integral and hard to deform so as to prevent optical axis misalignment.

However, even if the frame of the optical unit is formed as one piece and does not deform, for example, if the base frame is deformed after the frame is attached to the base frame, the deformation of the base frame will be caused by the frame of the optical unit. This causes deformation and distortion in the frame of the optical unit, causing an optical axis shift, making it impossible to perform accurate image processing, for example, in the optical unit that constitutes the image reading section of a facsimile.

Therefore, in the past, the rigidity of the optical unit frame itself was set high, or a highly rigid tray was placed at the bottom of the optical unit frame, and this tray was placed on the base frame. , to prevent deformation or distortion from occurring in the frame of the optical unit.

(Problems to be Solved by the Invention) Therefore, with the conventional method of mounting an optical unit, there are problems such as increased weight and cost, and no matter how rigid it is, it is necessary to avoid a certain degree of optical axis misalignment. There was a problem that I couldn't do it.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a method for attaching an optical unit that can reduce weight and cost while preventing optical axis misalignment.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention fixes three places out of three places spaced apart from each other on the frame of the optical unit to the base frame, and fixes the remaining one place within a minute range. It is characterized in that it is connected to the base frame in a movable manner.

(Function) For example, even if the base frame is deformed or distorted, one part of the support part of the frame of the optical unit is displaced within a minute range, so that the deformation or distortion of the base frame is reduced to the frame of the optical unit. Therefore, deformation and distortion of the frame of the optical unit can be prevented, and optical axis deviation can be prevented.

In addition, the frame part of the optical unit fixed to the base frame supports one end of the optical member in the longitudinal direction so that the inclination angle can be changed, and the frame part of the optical unit connected to the base frame supports the optical member so that the inclination angle can be changed within a minute range. When the other longitudinal end of the member is positioned and fixed, even if one part of the supporting part of the frame of the optical unit is displaced due to distortion of the base frame, the inclination of the optical member at the displaced frame part of the optical unit remains unchanged.
In addition, since the inclination of the optical member fixed to the base frame changes, changes in the inclination of the optical member with respect to the optical system of the optical unit can be absorbed, and optical axis deviation can be prevented.

(Example) Hereinafter, an example in which the present invention is applied to an image reading section of a facsimile will be described.

Figure 1 is a schematic side view of a facsimile machine.
includes an image reading section 3, a transmitting section (not shown) that transmits the image read by the image reading section 3, a receiving section (not shown) that receives the image signal, and a roll function based on the image signal received by the receiving section. It includes an image reproducing section 7 that prints an image on paper 5, and a base frame 9 that supports the image reading section 3, transmitting section, receiving section, and image reproducing section 7.

Figure 2 is a plan view of the image reading section, Figure 3 is a plan view of the same with the guide plate removed, Figure 4 is a side view showing the arrangement of the light source, light receiving element, and optical members, and Figure 5 is the original document. FIG.

The image reading unit 3 includes a light source (LED) that irradiates the document with light.
11, an optical member that guides reflected light from the document and forms an image, and a light receiving element (CCD) 13 that is placed at the image formation location and converts the optical image into electrical image information.

In the embodiment, the first optical member is used as the optical member. Second mirror 15.1
7 and an imaging lens I9 are used, and the first and second mirrors 15 and 17 are each formed with a predetermined length as shown in FIG.

The frame 21 of the image reading section 3 has side plate sections 21A on both sides.
and an inclined upper surface portion 21B that connects the side plate portions 21A on both sides.

A guide plate 23 is disposed above the upper surface 21B of the frame 21, and the upper surface 21B of the frame 21 and the guide plate 23 form a document conveyance path 25. The guide plate 23 is arranged as shown in FIG. , handle 26
It is disposed so as to move away from and approach the upper surface portion 21B by the operation.

As shown in FIG. 5, upstream of the conveyance path 25, there is provided a separation section 27 that sends out the documents one by one, and downstream of that, there is provided a feed section 29 that sends out the documents in the conveyance direction, and the separation section 27 sends out the documents one by one. As shown in FIG.
1 is arranged.

The separating section 27 includes an ADF roller 271 and a separating rubber 27.
2. Consists of a separation rubber presser spring 273, a paper presser 274, etc.

The feeding unit 29 also includes two rollers 291 and 292 supported on the frame 21 side and spaced apart in the conveying direction, and a roller 294 supported on the guide plate 23 side and pressed against the rollers 291 and 292 by a spring 293, respectively. ,29
As shown in FIGS. 2 and 3, three rollers 292 and 295 are provided separately in a direction orthogonal to the conveyance direction.

Then, as shown in FIG. 4, two rollers 291.2
The light from the light source 11 is irradiated onto the document portion between the first and second sections. It is guided to the light receiving element 13 by the second mirror 15° 17 and the imaging lens 19, and is read by converting it into electrical image information line by line in a direction perpendicular to the direction of conveyance of the document. As the document is conveyed, the entire document is read.

The light source 11 is supported by the frame 21 via a mounting plate 33, and the light receiving element 13 and the imaging lens 19 are mounted on the case 3.
5, and is supported by the frame 21 via the first. The second mirror 15.17 is disposed so that its longitudinal direction extends between the side plate portions 21A on both sides.

The frame 21 is attached to the base frame 9 in the following manner.

To explain in detail, as shown in FIG. 3, two branch pieces 37 are bent at a distance from each other at the lower end of one of the side plate parts 21A, and these branch pieces 37 are secured by screws 39 as shown in FIG. It is fastened to the boss portion 41 of the base frame 9.

Further, as shown in FIG. 3, one branch piece 43 is bent and formed at the lower end of the other side plate portion 21A.

A hole 43A is formed in the branch piece 43, and as shown in FIGS. 7 and 8, the hemispherical protrusion 45 of the base frame 9 is engaged with the hole 43A, and A leaf spring 47 is provided.

The base end of the leaf spring 47 is fixed to the pace frame 9 by a screw 49, and the distal end portion 47A engages with the hole 43A, and the branch piece 43
is always urged in the direction of pressing against the protrusion 45.

These holes 43A, protrusions 45, and leaf springs 47 allow the support piece 4 to
3 is supported so as to be displaceable with respect to the base frame 9 within a minute range.

Further, as shown in FIG. 9, one end 15A of the first mirror 15 located on the side of the support piece 37 fixed to the base frame 9 is configured so that its inclination angle can be changed by one holding piece 51 and a protrusion 53. Supported.

In addition, the first
As shown in FIG. 10, the other end 15B of the mirror 15 is positioned and supported by a holding piece 55 and a flat plate portion 57 with a fixed inclination angle.

Similarly, one end 1 of the second mirror 17 located on the support piece 37 side
7A, as shown in FIG. 11, one presser piece 61;
The other end of the second mirror 17 is supported such that the angle of inclination by the corner portion 63 can be changed and is located on the branch piece 43 side], 7
B is supported by the presser piece 65 and the flat plate part 67 with the inclination angle fixed, as shown in No. 1213.

Next, the effect will be explained.

For example, if the base frame 9 is deformed or distorted after the image reading unit 3 is attached to the base frame 9, the support piece 43 will be displaced within a minute range, causing the base frame 9 to
Since the transmission of deformation and strain to the frame 21 can be blocked,
Deformation and distortion of the frame 21 can be prevented, and optical axis deviation can be prevented by eliminating the influence on optical members such as the first mirror 15 and the second mirror 17.

Further, in the embodiment, when the branch piece 43 is displaced within a minute range, the first. Second mirror 15.
17 remains the same, and the first of the 37 fixed branch pieces. Since the inclination of the second mirror 15.17 changes, even if the support piece 43 is displaced and the frame 2] is deformed, the change in the inclination of the first and second mirrors 15.17 with respect to the optical system can be absorbed, and the optical axis Misalignment can be prevented.

It should be noted that the present invention is equally applicable to the attachment of optical units to various devices such as copying machines, scanners, and laser beam printers in addition to facsimiles.

(Effects of the Invention) As is clear from the above explanation, according to the mounting method of the present invention, deformation of the pace frame and transmission of distortion to the frame of the optical unit can be prevented with a simple configuration, and therefore, It is possible to prevent deformation and distortion of the frame, prevent optical axis misalignment, reduce the weight and cost of various devices using optical units, and furthermore, it is possible to prevent the inclination of optical members with respect to the optical system of the optical unit. It becomes possible to maintain it constant.

[Brief Description of the Drawings] Fig. 1 is a schematic side view of the facsimile, Fig. 2 is a plan view of the image reading section, Fig. 3 is a plan view of the same with the guide plate removed, Fig. 4 is the light source, FIG. 5 is a side view showing the arrangement of the light-receiving element and optical member; FIG. 5 is a side view showing the document conveyance path; FIG. 6 is a side view showing the attachment state of the branch piece; FIG. 7 is a side view showing the attachment state of the branch piece. A side view, FIG. 8 is a cross-sectional front view of the same, and FIGS. 9 to 12 are side views showing how the mirror is attached. In the figure, 1 is a facsimile, 3 is an image reading unit, 9 is a base frame, 11 is a light source, 13 is a light receiving element, 15 is a first mirror, I7 is a second mirror 19 is an imaging lens, and 21 is a frame. is a branch.

Claims (2)

[Claims] (1) An optical member that is disposed in an optical path that guides a light beam corresponding to image information to a light receiving means and that determines the course of the light or convergence or diffusion of the light, and a frame that supports the optical member. This is a method of attaching an optical unit to a base frame, in which two of the three locations on the frame of the optical unit that are spaced apart from each other are fixed to the base frame, and the remaining location is attached to the base frame so that it can be displaced within a minute range. A method for attaching an optical unit, characterized in that: (2) The optical member has a predetermined length, and two locations located on one end side in the longitudinal direction of the optical member in the frame of the optical unit are fixed to a base frame, and the optical member in the frame of the optical unit is fixed to the base frame. One longitudinal end of the optical member is connected to the base frame so as to be able to move within a minute range, and one longitudinal end of the optical member is connected to the frame of the optical unit so that the inclination angle can be changed. 2. The method for attaching an optical unit according to claim 1, wherein the optical unit is supported, and the other end is positioned and supported with a fixed inclination angle.