JP3037966B2 - How to attach the optical unit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for mounting an optical unit, and more particularly, to a method for mounting a frame of an optical unit on a base frame.

(Prior Art) An optical member, which is disposed in an optical path for guiding a light beam corresponding to image information to a light receiving unit and determines a light path or light focusing and diffusion, and a frame supporting the optical member. In the optical unit provided, it is desirable that the frame is integral and hardly deformed so as not to cause an optical axis shift.

However, even if the frame of the optical unit is formed integrally and hardly deformed, for example, if the base frame is deformed after the frame is attached to the base frame, the deformation of the base frame is transmitted to the frame of the optical unit. As a result, the frame of the optical unit is deformed or distorted, causing an optical axis shift. For example, an optical unit constituting an image reading unit of a facsimile cannot perform accurate image processing.

Therefore, conventionally, the rigidity of the optical unit frame itself is set high, or a highly rigid tray is provided below the optical unit frame, and this tray is mounted on the base frame. In this case, deformation and distortion do not occur in the frame of the optical unit.

(Problems to be Solved by the Invention) Therefore, in the conventional mounting method of the optical unit,
There are problems such as an increase in weight and cost, and
Even if the rigidity is increased, there is a problem that some deviation of the optical axis cannot be avoided.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide an optical unit mounting method capable of reducing the weight while preventing the optical axis shift and reducing the cost.

(Means for Solving the Problems) In order to achieve the above object, the present invention is provided in an optical path for guiding a light beam corresponding to image information to a light receiving unit, and determines a light path or a light convergence / diffusion. A method for attaching an optical unit having a frame supporting the optical member to the base frame, wherein the optical member has a length, and a length of the optical member in a frame of the optical unit in a longitudinal direction of the optical unit. Two places located on one end side and spaced from each other are fixed to the base frame, and one place located on the other end side in the longitudinal direction of the optical member in the frame of the optical unit is displaceable within a minute range. And one end in the longitudinal direction of the optical member is supported by the frame of the optical unit so that the inclination angle can be changed, and the other end is positioned and The tilt angle is fixed and supported.

(Operation) For example, even if deformation or distortion occurs in the base frame, the deformation or distortion of the base frame is transmitted to the frame of the optical unit by changing one portion of the support portion of the frame of the optical unit within a minute range. Therefore, deformation and distortion of the frame of the optical unit can be prevented, and optical axis deviation can be prevented.

Further, one end in the longitudinal direction of the optical member is supported by the frame portion of the optical unit fixed to the base frame so that the inclination angle can be changed, and the optical unit is displaceably coupled to the base frame within a minute range. Since the other end in the longitudinal direction of the member is positioned and fixed, when one portion of the support portion of the frame of the optical unit is displaced due to the distortion of the base frame, the inclination of the optical member in the displaced frame portion of the optical unit does not change. In addition, since the inclination of the optical member in the portion fixed to the base frame changes, the change in the inclination of the optical member with respect to the optical system of the optical unit can be absorbed, and the optical axis shift can be prevented.

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

FIG. 1 is a schematic side view of a facsimile. A facsimile 1 includes an image reading unit 3, a transmitting unit (not shown) for transmitting an image read by the image reading unit 3, and a receiving unit (not shown) for receiving an image signal. And an image reproducing unit 7 for printing an image on the roll paper 5 based on the image signal received by the receiving unit, and a base frame 9 supporting the image reading unit 3, the transmitting unit, the receiving unit, and the image reproducing unit 7. .

FIG. 2 is a plan view of the image reading section, FIG. 3 is the same plan view with the guide plate removed, FIG. 4 is a side view showing the arrangement of a light source, a light receiving element, and an optical member, and FIG. FIG. 3 is a side view showing the transfer path of FIG.

The image reading unit 3 includes a light source (LED) 1 for irradiating the original with light.
1 and an optical member for guiding reflected light from the original and forming an image,
A light receiving element (CCD) 13 that is arranged at the image forming location and converts an optical image into electrical image information.

In the embodiment, the first and second mirrors 15 and 17 are used as optical members.
And the imaging lens 19, and the first and second mirrors 15, 17
Are formed with a predetermined length as shown in FIG.

The frame 21 of the image reading unit 3 is provided with side plates 21A on both sides.
And the inclined upper surface portion 21B connecting the side plate portions 21A on both sides.
Consists of

A guide plate 23 is provided above the upper surface 21B of the frame 21.
Is disposed, the upper surface portion 21B of the frame 21 and the guide plate 2
3 forms a document transport path 25 and guide plate 23
As shown in FIG. 2, is disposed so as to be separated and approached from the upper surface portion 21B by operating the handle 26.

As shown in FIG. 5, a separating section 27 for feeding the originals one by one is provided upstream of the transport path 25, and a feeding section 29 for feeding the originals in the transport direction is provided downstream thereof. As shown in FIG. 3, a gear train 31 for driving the separation unit 27 and the feed unit 29 is disposed on one side plate of the 21.

The separating section 27 includes an ADF roller 271, a separating rubber 272, a separating rubber pressing spring 273, a paper pressing 274, and the like.

Further, the feed portion 29 is composed of two rollers 291 and 292 supported on the frame 21 side and spaced in the transport direction, and rollers 294 and 295 supported on the guide plate 23 side and pressed by the rollers 291 and 292 by springs 293, respectively. As shown in FIGS. 2 and 3, three rollers 292 and 295 are provided separately in a direction perpendicular to the transport direction.

Then, as shown in FIG.
Light from the light source 11 is applied to the original portion between
The light is guided to the light receiving element 13 by the first and second mirrors 15 and 17 and the imaging lens 19, and is read by being converted into electrical image information line by line in a direction orthogonal to the document conveying direction. The reading of the entire original is performed by reading and transporting the original.

The light source 11 is supported by the frame 21 via a mounting plate 33, the light receiving element 13 and the imaging lens 19 are supported by the frame 21 via a case 35, and the first and second mirrors 15, 17 are It is disposed so that the longitudinal direction extends between the side plates 21A on both sides.

The attachment of the frame 21 to the base frame 9 is performed as follows.

More specifically, as shown in FIG. 3, at the lower end of one side plate portion 21A, two support pieces 37 are formed at an interval, and these support pieces 37 are formed by screws 39 as shown in FIG. It is fastened to the boss 41 of the base frame 9.

As shown in FIG. 3, one support piece 43 is bent at the lower end of the other side plate portion 21A.

A hole 43A is formed in the support piece 43. As shown in FIGS. 7 and 8, the hemispherical projection 45 of the base frame 9 is formed.
Is engaged with the hole 43A, and a leaf spring 47 is disposed above the support piece 43.

The leaf spring 47 has a base end fixed to the base frame 9 by screws 49, a front end portion 47A is engaged with the hole 43A, and the support piece 43 is
It is always biased in the direction of pressing.

The support piece 43 is supported by the hole 43A, the protrusion 45, and the leaf spring 47 so as to be displaceable with respect to the base frame 9 within a minute range.

Further, one end 15A of the first mirror 15 located on the side of the support piece 37 fixed to the base frame 9, as shown in FIG.
One holding piece 51 and the projection 53 are supported so that the inclination angle can be changed.

In addition, the first member located on the side of the support piece 43 supported so as to be displaceable.
As shown in FIG. 10, the other end 15B of the mirror 15 is
And the flat plate portion 57, and are supported at a fixed inclination angle.

Similarly, one end 17A of the second mirror 17 located on the support piece 37 side
As shown in FIG. 11, the other end 17B of the second mirror 17 located on the support piece 43 side is supported so that the inclination angle of one holding piece 61 and the corner 63 can be changed. As shown in FIG. 12, the holding piece 65 and the flat plate portion 67 are supported at a fixed inclination angle.

 Next, the operation will be described.

After attaching the image reading unit 3 to the base frame 9,
For example, when the base frame 9 is deformed or distorted, the support piece 43 is displaced within a minute range, and thus the base frame 9 is displaced.
Since the transmission of the deformation and distortion of the frame 21 to the frame 21 can be blocked, the deformation and distortion of the frame 21 can be prevented, and the optical axes such as the first mirror 15 and the second mirror 17 are not affected. Can be prevented.

Further, in the embodiment, when the support 43 is displaced within a minute range, the inclination of the first and second mirrors 15 and 17 on the displaced support 43 does not change, and the second mirror 15 and 17 on the fixed support 37 side. 1, second
Since the inclination of the mirrors 15 and 17 changes, even if the support piece 43 is displaced and the frame 21 is deformed, the change in the inclination of the first and second mirrors 15 and 17 with respect to the optical system can be absorbed and the optical axis shift can be prevented. it can.

The present invention can be similarly applied to the attachment of an optical unit to be mounted on various other devices such as a copying machine, a scanner, and a laser beam printer, in addition to the facsimile.

(Effect of the Invention) As is clear from the above description, according to the mounting method according to the present invention, it is possible to prevent deformation and distortion of the base frame from being transmitted to the frame of the optical unit with a simple configuration, and therefore, the optical unit It can prevent deformation and distortion of the frame, prevent optical axis deviation, can reduce the weight and cost of various devices using the optical unit, and can further reduce the inclination of the optical member with respect to the optical system of the optical unit. It can be kept constant.

[Brief description of the drawings]

1 is a schematic side view of a facsimile, FIG. 2 is a plan view of an image reading section, FIG. 3 is a plan view of the same with a guide plate removed, and FIG. 4 is an arrangement of a light source, a light receiving element, and an optical member. 5, FIG. 5 is a side view showing a document conveying path, FIG. 6 is a side view showing a mounting state of a support piece, FIG. 7 is a side view showing a mounting state of a support piece, and FIG. FIG. 9 to FIG. 12 are side views showing the mounted state of the mirror. 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, 17 is a second mirror, 19 is an imaging lens, 21 is a frame,
37 and 43 are supporting pieces.

Claims (1)

(57) [Claims] 1. An optical member disposed in an optical path for guiding a light beam corresponding to image information to a light receiving means, and determining an optical path and / or a convergence and diffusion of light; and a frame supporting the optical member; A method of attaching an optical unit comprising a base frame, wherein the optical member has a length, and two places spaced apart from each other at one longitudinal end of the optical member in the frame of the optical unit. One portion of the frame of the optical unit, which is fixed to the other end side in the longitudinal direction of the optical member, is coupled to the base frame so as to be displaceable within a minute range. One end is supported by the frame of the optical unit so that the inclination angle can be changed, and the other end is positioned and supported with the inclination angle fixed. The mounting method of the optical unit.