JPH0735492Y2 - Image reader - Google Patents

Description

TECHNICAL FIELD The present invention relates to an image reading device that optically reads an image of a document.

Conventional Technology First, a conventional example is shown in FIG. Reference numeral 1 denotes a transparent document table on which a document 2 is placed, and a support 4 having a cover 3 facing the lower surface of the document table 1 is movably provided along the document table 1. A plate 50 that holds a plurality of light sources 5 adjacent to the document table 1 is fixed to the cover 3. A slit 7 is formed in the plate 50 and a part of the cover 3 facing the plate 50 so as to pass light therethrough along the width direction of the original 2. The support 4 has a mirror 8 located below the slit 7 and other mirrors 9,
10 and are fixed. Further, an optical system case 14 holding a converging lens 11 which is an image forming optical element is fixedly attached to the support body 4. A substrate 13 that holds the image sensor 12 is attached to the optical system case 14.
That is, as shown in FIG. 6, the optical system case 14 is formed with a cylindrical portion 15 that holds the converging lens 11 movably in the optical axis direction. The cylindrical portion 15 is in contact with the outer periphery of the converging lens 11. A screw 16 for fixing the movement of the lever lens 11 in the optical axis direction is screwed (see FIG. 5). The optical system case 14 is formed with mounting holes 51 through which the screws 17 screwed into the support 4 are inserted. Since these mounting holes 51 are oval-shaped, the optical system case 14 The position can be adjusted in the optical path length direction Z. Further, on both sides of the substrate 13, there are formed mounting holes 52 through which screws 53 screwed on both sides of the end face of the optical system case 14 are inserted with a predetermined clearance.

In such a structure, the original 2 is illuminated by the light source 5, and the reflection image of the original 2 is reflected by the mirrors 8, 9, 10.
Further, an image is formed on the image sensor 12 by the converging lens 11.

Here, FIG. 8 shows the reading range P of the original 2 with a hatched portion. X'is a reading start position in the main scanning direction, Y'is a reading start position in the sub-scanning direction, and L is a reading magnification from a predetermined value. A reading range when the reading magnification is large, 1 is a reading range when the reading magnification is smaller than a predetermined value, and α and β are reading angles (inclinations of reflected optical axes from the original 2). The reading magnification is adjusted by loosening the screw 17 and finely moving the optical system case 14 in the optical path length direction, and the focus adjustment is performed by loosening the screw 16 and finely moving the converging lens 11 with respect to the optical system case 14 in the optical axis direction. Adjusted. If the reading angle is tilted in the α or β direction,
As shown in FIG. 6, it is adjusted by loosening the screw 53 and rotating the substrate 13 in the direction R around the optical axis. Similarly, the adjustment of the reading start position X ′ in the main scanning direction is performed by moving the substrate 13 in the X direction. Then, the sub-scanning direction reading start position Y'is adjusted by finely moving the substrate 13 in the Y direction. In order to adjust the inclination of these reading angles and the reading start positions X ', Y'in the main scanning direction and the sub-scanning direction, the mounting holes 52 of the board 13 are provided with screws 53.
Is formed with a circular hole larger than the outer diameter of.

Conventionally, in order to adjust the reading angle, the reading start position X ', Y'in the main scanning direction and the sub-scanning direction, the substrate 13 is displaced in the R, X, Y directions. Therefore, it is not possible to adjust the positions in the three directions independently, and the adjustment state in the other direction is likely to be misaligned when adjusting in one direction, and adjustment requires skill and time.

Means for Solving the Problems A light source that is close to the document table and a mirror that reflects the reflected light from the document are provided on a support that moves relative to the document table, and the position in the reflected light path from the mirror is provided. The optical system case for holding the image forming optical element is operated from a direction parallel to the optical axis direction of the image forming optical element to move the image sensor to a position orthogonal to the optical axis of the image forming optical element. An adjustable holding unit is provided, and by operating from the same direction as the operating direction of the holding unit, the optical system case is rotatable on the support body around the optical axis of the imaging optical element and at an arbitrary position. Rotational direction position adjusting means for holding in a fixed manner is provided.

Action When mounting the image sensor to the optical system case that holds the imaging optical element, adjust the relative position of the imaging optical element and the image sensor by the holding part to complete the unit, and attach this optical system case to the support. At times, only the reading angle of the original can be adjusted independently by the rotation position adjusting means, which prevents the adjustment state of the imaging optical element and the image sensor from being affected and facilitates the adjustment work. Can be done. Further, since the operating direction of the holding portion and the operating direction of the rotational position adjusting means are the same direction, there is no complication during the adjustment work, and further simplification thereof can be achieved. Moreover, since the adjusting portion of the holding portion and the adjusting portion of the rotational position adjusting means are different, the structure does not become complicated.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. The same parts as those described in FIGS. 5 to 8 are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 3, a plate 6 for holding the light source 5 is attached to the cover 3, and a slit 7 is formed in the plate 6 and a part of the cover 3 facing the plate 6. Also,
As shown in FIG. 1, on both sides of the end face of the optical system case 14, there are screws 18 which are holding portions for holding the substrate 13 on which the image sensor 12 is fixed so as to be displaceable in the main scanning direction X and fixed at an arbitrary position. It is screwed. That is, although the mounting holes 19 through which the screws 18 are inserted are formed on both sides of the substrate 13, these mounting holes 19 are long holes that are long in the X direction. Further, a mounting plate having elongated holes 21 through which a screw 17 screwed into the support body 4 is inserted and which is mounted on the support body 4 so as to be positionally adjustable in the optical path length direction Z.
20 are provided. On both sides of the mounting plate 20, a screw 22 is screwed as a rotation direction position adjusting means for holding the optical system case 14 so as to be rotatable around the optical axis of the converging lens 11 and fixed at an arbitrary position. That is, the mounting holes 23 through which the screws 22 are inserted are formed on both sides of the optical system case 14 so as to have a long hole shape elongated in the Y direction. Further, openings 24 for letting out the screws 22 are formed on both sides of the substrate 13. further,
As shown in FIG. 4, mounting holes 25 elongated in the sub-scanning direction are formed on both sides of the plate 6, and screws 26 passed through these mounting holes 25 are screwed on both sides of the cover 3. .

In such a configuration, loosen the screws 17 and
The position in the optical path length direction Z can be adjusted by displacing in the optical path length direction Z. Further, when the substrate 13 is coupled to the optical system case 14 with the screw 18, the substrate 13 is displaced in the X direction so that the relative position of the converging lens 11 and the image sensor 12 in the main scanning direction, that is, in the main scanning direction. The reading start position X'is adjusted. Further, by loosening the screw 22 and rotating the optical system case 14 in the direction R around the optical axis, the reading angle from the original 2 can be adjusted. Further, by loosening the screw 26 and displacing the plate 6 together with the slit 7 in the sub scanning direction, the reading start position in the sub scanning direction is adjusted.

As described above, the reading start position X ′ in the main scanning direction, the reading start position Y ′ in the sub scanning direction, the reading angle α with respect to the original 2,
Since β, the optical path length, etc. can be adjusted independently of each other, the adjustment work in one direction does not affect the adjustment in the other direction, which makes the adjustment work extremely easy. . Further, since the operating direction of the holding portion 18 and the operating direction of the rotational position adjusting means 22 are the same direction, there is no complication during the adjustment work, and further simplification thereof can be achieved. Moreover, the adjusting portion of the holding portion 18 and the rotating position adjusting means 22
The structure is not complicated because it is different from the adjustment part of.

Effect of the Invention Since the present invention is configured as described above, when mounting the image sensor in the optical system case holding the imaging optical element,
The holding unit adjusts the relative position of the imaging optical element and the image sensor to complete the unit, and when the optical system case is attached to the support, only the reading angle adjustment with respect to the original is independently adjusted by the rotation direction position adjusting means. This can prevent the adjustment state of the imaging optical element and the image sensor from being affected,
As a result, adjustment work can be performed easily, and
Since the operating direction of the holding part and the operating direction of the rotational position adjusting means are the same direction, it is possible to prevent complexity during adjustment work and to further facilitate the adjustment work. Since the adjustment position of the rotation position adjusting means is different, there is an effect that the structure can be prevented from becoming complicated.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
FIG. 1 is an exploded perspective view showing a support structure of an optical system case, FIG. 2 is a front view showing its assembled state, FIG. 3 is a vertical sectional side view showing an internal structure of a support, and FIG. 4 is a plate for a cover. FIG. 5 to FIG. 8 show a conventional example, FIG. 5 is a vertical sectional side view showing the internal structure of the support, and FIG. 6 is an optical system case. FIG. 7 is an exploded perspective view showing a support structure, FIG. 7 is a front view of a substrate on which an image sensor is held, and FIG. 8 is an explanatory view showing a reading range. 1 ... Platen, 4 ... Support, 5 ... Light source, 8-10 ... Mirror,
11 ... Imaging optical element, 12 ... Image sensor, 14 ... Optical system case, 18 ... Holding part, 22 ... Rotation direction position adjusting means

Claims (1)

[Scope of utility model registration request] 1. A support which moves relative to a document table is provided with a light source close to the document table and a mirror for reflecting the reflected light from the document, and the mirror is positioned in the reflected light path from the mirror. The position of the image sensor in the direction orthogonal to the optical axis of the imaging optical element can be adjusted by operating the optical system case holding the image optical element from a direction parallel to the optical axis direction of the imaging optical element. A holding portion for holding the optical system case is provided around the optical axis of the imaging optical element on the support body by being operated from the same direction as the operating direction of the holding portion, and the optical system case can be fixed at any position. An image reading apparatus characterized in that a rotation direction position adjusting means for holding the image reading apparatus is provided.