JPH0735491Y2 - Image sensor position adjustment mechanism in document reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art] Conventionally, a document reading apparatus used in a digital copying machine, a facsimile, or the like illuminates a document by relatively moving the document and a light source, and reflects light from the document. Is guided to the image sensor by the lens to read the original image.

In order for the original document to be read correctly by the image sensor, it is necessary that the image forming position of the lens and the light receiving area of the image sensor are exactly the same. Conventionally, the original image received by the image sensor is The position of the image sensor was adjusted while checking.

Then, as for the position adjustment of the conventional image sensor, after adjusting the attachment member of the image sensor by advancing and retracting the adjustment screw, the screw is fixed to the immovable part of the apparatus body (see Japanese Utility Model Publication No. 58-11092). Or, the adjustment screw was directly subjected to viskeeping by painting.

[Problems to be solved by the invention]

However, the fixing by the screw has a complicated structure in which a screw hole is provided in the manufacturing process for fixing and a long hole which can be adjusted is formed, and the adjustment work is also required. There was a problem that it was complicated.

On the other hand, although the viskeeping process can be easily fixed, there is a problem that the image sensor cannot be replaced or adjusted at the serviceman level.

[Purpose of device]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a position adjusting mechanism for an image sensor in a document reading apparatus that has a simple configuration and is easy to adjust.

[Means for solving problems]

In order to achieve the above object, the position adjusting mechanism of the image sensor in the document reading device of the present invention illuminates and scans the document, and the reflected light from the document is guided to the image sensor by the lens. A position adjusting mechanism, a support plate to which the image sensor is integrally mounted, a through hole formed in the support plate, the through hole being a long hole in a direction in which the image sensor approaches and separates from the lens; A threaded rod that is erected on a stationary portion of the main body, extends in a direction perpendicular to the direction in which the image sensor approaches and separates from the lens, and penetrates the through hole, and a screw fitted into a thread of the threaded rod. An adjustment member having a hole formed therein and movable along with the support plate along the screw rod, a support portion formed on the adjustment member and abutting on the support plate, and fitted into a thread of the screw rod. A fixing member that is formed with a screw hole, is coaxial with the adjusting member, and fixes the support plate by sandwiching the supporting plate between the adjusting member, and a coil-shaped compression spring member disposed in the fixing member. It is characterized by

[Action]

According to the position adjusting mechanism of the image sensor in the document reading apparatus having the above configuration, the fixing member coaxially arranged with respect to the screw rod erected on the immovable portion of the apparatus body is loosened, and then the adjusting member is moved. It can be operated to adjust the height of the support plate.

Since the through hole of the support plate through which the screw rod penetrates is formed as a long hole in the direction in which the image sensor moves closer to and away from the lens, the position adjustment can be performed by moving the support plate in the same direction.

At this time, since the adjustment member is provided with the support portion that enables the above-mentioned movement when the support plate is in contact with the adjustment member, the adjustment work is facilitated.

〔Example〕

 Embodiments will be described below in detail with reference to the accompanying drawings.

FIG. 4 is a schematic cross-sectional view showing the internal structure of the document reading apparatus, in which the optical system 2 for scanning and illuminating the document G placed on the document placing plate 11 which is a transparent plate is arranged in the apparatus main body 1. Has been done. The optical system 2 includes an illumination lamp 21 as a light source, a reflector 22, mirrors 23, 24, 25, a lens 26, and an image sensor 27. The image sensor 27 is
CCD type image sensors, MOS type image sensors, etc. are used.

Then, the illumination lamp 21, the reflector 22 and the mirror 23 are integrally moved at a predetermined speed in the direction of the arrow A, and
By moving 24 and 25 integrally in the same direction at a speed half the moving speed of the lamp 21, etc., the original G placed on the original placing plate 11 is illuminated and reflected from the original G. Light mirror
It is guided to an image sensor 27 (shown by an optical path C in FIG. 4) through 23, 24, 25 and a lens 26.

FIG. 1 is a side sectional view of a position adjusting mechanism of an image sensor of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a plan view thereof. The image sensor 27 is fixed to a mounting plate 28, and the mounting plate 28 is fixed to a supporting plate 29, that is, the image sensor 27 is integrally mounted to the supporting plate 29. 3), three screw rods 31 each having a screw thread are provided upright, and an adjusting member 32 and a fixing member 33 are coaxially arranged on each of the three screw rods 31. .

The adjusting member 32 includes a screw hole portion 32a fitted into the thread of the screw rod 31, an adjusting portion 32b having a large radius, and an adjusting portion 32b.
It is composed of a support portion 32c protruding upward from the guide portion 32d and a guide portion 32d protruding further upward from the support portion 32c.

The fixing member 33 has a screw hole portion 33a formed in the upper portion and fitted in the thread of the screw rod 31 and a knob portion 33b formed in the circumference, and a cavity 33c is formed below the screw hole portion 33a. Has been formed.

A screw rod 31 penetrates through the support plate 29 and the optical path C
A through hole 29a that is a long hole is formed in the direction (the direction in which the image sensor 27 of FIG. 4 approaches and separates from the lens 26), and the guide portion 32d of the adjusting member 32 penetrates the through hole 29a. The support plate 29 is placed on the upper surface of the support portion 32c.

Then, the support plate 29 is sandwiched and fixed by the upper surface of the supporting portion 32c of the adjusting member 32 and the lower surface of the fixing member 33.

A coil-shaped compression spring 3 is provided in the fixing member 33, that is, in the cavity 33c.
4, the compression spring 34 surrounds the screw rod 31, one end of the compression spring 34 abuts the fixing member 33 and the other end abuts the upper surface of the support plate 29, and urges them in opposite directions. ing.

Two protruding pieces 29b are erected on the support plate 29, and a screw rod 29c is erected horizontally from the protruding piece 29b in the optical path C direction.

A fixing piece 35 is erected on the board 10, and the screw rod 29c penetrates the elongated hole 35a.

A coiled compression spring 36 is surrounded by the screw rod 29c. One end of the compression spring 36 is a protruding piece 29b and the other end is a fixing piece 3b.
It is abutted against 5 and urges them in opposite directions.

The screw rod 29c is further provided with an adjusting member 37 which is located on the opposite side to the compression spring 36 with respect to the fixed piece 35 and which has a screw hole to be fitted into the thread of the screw rod 29c.

Next, the adjustment procedure will be described mainly with reference to FIGS. 1 and 2.

In the adjustment, first, the fixing member 33 is loosened upward.

Next, while monitoring the output of the image sensor 27 with a measuring device such as an oscilloscope, the adjusting section 32b of the three adjusting members 32 is
Is operated to adjust the height of the image guided by the lens 26 so that the image is located at an appropriate position of the image sensor 27.

At this time, the coil-shaped compression spring 34 inserted in the fixing member 33
Urges both the fixing member 33 and the support plate 29 in opposite directions, so that the support plate 29 is always brought into contact with the support portion 32c of the adjusting member 32 even if the support plate 29 has a warp. Therefore, when the fixing member 33 is tightened, there is no deviation from the time of adjustment. The through hole 35a of the fixing piece 35
Has a long hole to allow the vertical movement of the support plate 29 to move the screw rod 29c up and down.

When the height adjustment is completed, next, while the output of the image sensor 27 is monitored by a measuring instrument such as an oscilloscope in the same manner as described above, the adjusting member 37 is operated and the sensor support plate 29 is moved to the lens 26.
Then, the distance between the lenses of the image sensor 27 is adjusted. In this state, the fixing member
33 is not tightened, the support plate 29 is in a state of being pressed by the compression spring 34, and the through hole 29a is formed in the support plate 29, so that the adjustment work can be performed accurately and smoothly. .

When both adjustments are completed, operate the fixing member 33 to operate the fixing member.
Tighten the bottom surface of 33 against the top surface of support plate 29 to
9, that is, the image sensor 27 is fixed.

As is clear from FIG. 3, the adjusting portion 32 of the adjusting member 32 is
b is partially exposed from the support plate 29, and the fixing member 33 and the adjusting member 37 are configured to be operated by a finger.

This is because the adjustment work is usually performed from above by removing the document placing plate 11, so that the adjustment work can be performed with one hand.

In the above-mentioned embodiment, the lens adjustment is performed together with the height adjustment. However, if this configuration is adopted, it is preferable that the fixing member 33 can be used in common, but the lens adjustment is performed by other means. May be.

Furthermore, in the above-described embodiment, the adjusting member 32 is placed below and the fixing member 33 is placed above with the support plate 29 sandwiched therebetween, but the fixing member 33 may be placed below and the adjusting member 32 may be placed above. In that case, it is preferable to provide the fixing member with an adjusting portion having a large radius like the adjusting member 32.

Further, in the above-described embodiment, the spring member 34 is provided as a countermeasure against the warp of the support plate 29, but it is not particularly required if there is no problem with the warp or the like.

However, as described above, when the fixing member is arranged below, it is preferable to arrange it.

[Effect of device]

As described above, the position adjusting mechanism of the image sensor in the document reading device of the present invention illuminates and scans the document and guides the reflected light from the document to the image sensor by the lens. An adjusting mechanism, a support plate to which the image sensor is integrally mounted, a through hole formed in the support plate, the through hole being a long hole in a direction in which the image sensor approaches and separates from the lens; A screw rod that is erected on the immovable portion, extends in a direction perpendicular to the direction in which the image sensor approaches and separates from the lens, and that penetrates the through hole, and a screw hole that is fitted into the thread of the screw rod. An adjusting member that is formed and is movable along the screw rod together with the support plate; a support portion that is formed on the adjusting member and abuts the support plate; and a screw hole that is fitted into the thread of the screw rod. And a coil-shaped compression spring member disposed in the fixing member, the fixing member being formed coaxially with the adjusting member and sandwiching and fixing the support plate between the adjusting member and the fixing member. It has a practical effect that it is easy and adjustment work becomes easy.

[Brief description of drawings]

FIG. 1 is a side sectional view of a position adjusting mechanism of an image sensor according to the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a plan view thereof, and FIG.
FIG. 1 is a schematic sectional view showing the internal structure of a document reading apparatus to which the position adjusting mechanism of the image sensor of the present invention is applied. 10 ... Substrate (immovable part), 21 ... Illumination lamp, 26 ... Lens, 27
... image sensor, 29 ... support plate, 31 ... screw rod, 32 ... adjusting member, 33 ... fixing member, 34 ... compression spring.

Claims (1)

[Scope of utility model registration request] 1. A position adjusting mechanism of an image sensor in an original reading device, wherein an original is illuminated and scanned, and reflected light from the original is guided to an image sensor by a lens, wherein the image sensor is integrally mounted. A supporting plate, a through hole that is formed in the supporting plate, and is a hole that is long in the direction in which the image sensor moves closer to and away from the lens, and is erected on an immovable portion of the apparatus main body. A threaded rod extending in a direction perpendicular to the separating direction and penetrating the through hole, and a threaded hole fitted into a thread of the threaded rod are formed,
An adjusting member movable along the screw rod together with the support plate, a support portion formed on the adjusting member and abutting the support plate, and a screw hole to be fitted into a screw thread of the screw rod,
A document having a fixing member which is coaxial with the adjusting member and is fixed by sandwiching the supporting plate between the adjusting member and the adjusting member, and a coil-shaped compression spring member disposed in the fixing member. Position adjustment mechanism of the image sensor in the reading device.