JPS6135748B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for adjusting the mounting angle of a scanning element in a reading device such as a facsimile machine which uses a fixed scanning element to optically read an original image.

First, the arrangement of solid-state scanning elements in this type of reading device will be explained with reference to FIGS. 1 and 2. FIG.

A light source 2 for illuminating the image surface 1a of the original 1
is arranged close to the main scanning line 3 of the image plane 1a, and furthermore, an imaging lens 4 and a fixed scanning element 5 are arranged on the optical path of the reflected light L from the original 1. The image reflected light flux of the main scanning line 3 forms an image on the light receiving section 6 of the scanning element 5 formed by an arrayed CCD, a photodiode array, etc., and the imaged light is generated by the electronic self-scanning action of the element 5. The original image is read by photoelectric conversion.

By the way, as shown in FIG.
If there is a shift in the tilt, the fidelity of the photoelectric conversion operation of the image will decrease due to the image being out of focus, but since the dimensions of the scanning element 5 are extremely small, the tolerance for the shift is low. The degree of deviation is extremely small, and in general, it is difficult to keep this deviation within an allowable range even with the dimensional accuracy of manufacturing the scanning element 5 and the dimensional accuracy of its assembly.

That is, with the current manufacturing technology, the parallelism from the ceramic cover surface of the scanning element 5 to the light receiving part 6,
There are limits to the machining accuracy of the components and spacing dimensions, and there are also limits to the machining accuracy of the substrate and socket that hold the elements and form the drive circuit.Furthermore, the optical system itself has limitations on the optical axis. It is difficult to avoid misalignment of the scanning imaging line A due to eccentricity or misalignment, and for this reason, current reading devices of this type are equipped with an installation angle adjustment device for the solid-state scanning element 5 to adjust the output signal of the element. A practical alignment method is to adjust the light receiving section 6 to match the scanning imaging line A while looking at the image.

However, with conventional installation angle adjustment devices, the scanning element is connected to a stationary part through a connector whose inclination angle can be adjusted, or by screwing an adjustment screw with an elastic body interposed. However, with such a conventional adjustment structure, it is difficult to perform adjustment operations while the scanning element 5 is attached to the main body, and the adjustment The repeatability of the position is poor, the configuration for adjustment is complicated, and furthermore, the adjusted position may shift due to vibration or shock after adjustment, making it impractical in terms of operability and stability. There was a drawback that it wasn't.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a mounting angle adjustment device for a scanning element that has a simple structure, is easy to adjust, and has a reliable adjustment operation. Our goal is to provide the following.

The present invention will be described below based on illustrated embodiments.

In the adjusting device of the embodiment, a block-shaped lens frame 7 having a U-shaped cross section is used as the lens frame disposed in the optical system, as shown in FIGS. 3 to 6. This lens frame 7
The lens barrel 9 that holds the imaging lens 8 is formed by integrally molding a base portion 7a forming the lower part and base portions 7b and 7c forming the left and right side portions of the frame.
is screwed into a screw hole passing through the center of the base 7a so that its position in the optical axis direction can be adjusted.

Among the upper surfaces of the pedestals 7b and 7c forming the light-emitting side end surface of the lens frame 7, a plurality (two in the figure) of riveted head-shaped protrusions 10 are arranged in the front and back on the upper surface of one of the pedestals 7b. It is fixedly installed, and a screw hole 7d into which the fixing screw 11 is screwed is bored in the middle thereof.

In addition, the middle part of the outer edge of the upper surface of the other platform 7c is
It slopes downward inward and has a rectangular notch,
A guide hole 7f and a screw hole 7g are bored in the inner wall of the notch 7e, and near the side of the notch 7e,
Screw holes 7h for screwing in a plurality of (two in the illustration) fixing screws 12 are bored.

An adjustment screw 13 as a protruding body formed into a round head is inserted into this notch 7e, and the neck portion 13a of this adjustment screw 13 is inserted into the guide hole 7f.
is inserted into the screw hole 7g, and its screw shaft 13b is inserted into the screw hole 7g.
The lens frame 7 is screwed into the lens frame 7 at an angle to the end of the exit side surface thereof.

The adjustment screw 13 is attached to the lens frame 7 in this way.
As shown in FIG. 7, by screwing in the adjusting screw 13, the protrusion of the head of the adjusting screw 13 from the upper surface of the pedestal 7c can be reduced. Also, by unscrewing it, the protrusion can be increased.

Next, the element substrate 16 to which the socket 15 of the fixed scanning element 14 is fixed is fixed to the left and right steps 18a of the square mounting plate 18 by machine screws 17 at the four corners, and the mounting plate 18 A window hole 18b is formed by cutting off the central portion facing the scanning element 14.

Insertion holes 18c for fixing screws 11 and 12 are bored in the left and right sides of this mounting plate 18, and plate-shaped spring washers 19 or corrugated spring washers 2 are provided.
Fixing screws 11 and 12, which are inserted into the hole 18c through the screw holes 7d and 7h, are screwed into the screw holes 7d and 7h, respectively.

In the adjusting device configured as described above, by moving the adjusting screw 13 forward and backward, the inclination angle between the upper surface of the lens frame 7 and the lower surface of the mounting plate 18 as the light-receiving end surface of the scanning element 14 can be freely and easily set. Is possible. That is, first,
After slightly loosening the fixing screws 11 and 12 to the extent that the washer 19 does not wobble, turn the adjusting screw 13 while checking the output signal of the element 14 to change the mounting angle until the position where the best output is obtained is reached. After stopping, all you have to do is tighten the fixing screws 11 and 12. In this way, the light-receiving part of the element 14 will accurately match the scanning imaging line, and in the adjusted state, the adjusting screw 13 will be Since rotation is prevented by strong friction with the mounting plate 18, the adjustment position does not shift due to vibration or impact, and stable adjustment is possible.

In addition, for the purpose of simplifying the above-mentioned structure, as shown in FIG.
1 can be screwed into the inclined screw hole 22a of the base to make the same adjustment.

Here, in the above-mentioned embodiment, one of the protrusions was formed as a movable protrusion whose protrusion dimension was variable, but instead of this, a plurality of movable protrusions were formed on the upper surface of one base. By forming movable protrusions at three of the four corners on the top surface of both sides, it becomes possible to adjust the mounting angle in two coordinate directions. The number of movable protrusions can be freely set depending on the purpose.

According to the present invention, by rotating the protrusion screwed into the side surface of the lens frame and moving it forward and backward, the degree of protrusion of the protrusion from the exit side end surface of the lens frame, that is, the mounting inclination angle of the fixed scanning element mounting plate can be minimized. It can be adjusted very finely and easily.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the optical system of the reading device, FIG. 2 is a partial front view of FIG. 1, and FIG. A sectional view, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a plan view of FIG.
The plan end view taken along the line - in Fig. 3 and Fig. 6 are as follows:
An enlarged perspective view of the part shown in FIG. 3, and FIG.
FIG. 8 is a perspective view of a wave spring washer, and FIG. 9 is a front view of an adjusting screw showing another embodiment. 7... Lens frame, 8... Imaging lens, 1
3, 21... Adjustment screw as a movable protrusion, 14
...Solid state scanning element, 18...Mounting plate.

Claims (1)

[Scope of Claims] 1. An optical reading device that reads a document image using a solid-state scanning element that faces the image surface of the document through an imaging lens and has its light-receiving portion exposed to the scanning imaging beam. a lens frame that supports an image lens and has an output side end face that is perpendicular to the optical axis of the imaging lens; a solid-state scanning element mounting plate provided so as to be tiltable; a portion protruding from the output side end face; a part of the surface of the mounting plate facing the lens frame abuts; and the opposing surface of the mounting plate a protrusion that is screwed onto a side surface of the lens frame near the exit side end face at an angle with respect to the lens frame, and is movable forward and backward with respect to the lens frame, and the protrusion is moved forward and backward with respect to the lens frame. A mounting angle adjustment device for a solid-state scanning element, which adjusts a mounting angle of the mounting plate with respect to the output side end surface.