JPH056970U - Optical reader - Google Patents

Abstract

(57) [Summary] [Purpose] To enable easy and accurate focus adjustment and optical path adjustment. [Structure] First connection means (41) for supporting the wiring board (22) so as to be movable horizontally, vertically, and horizontally.
And a second connecting means (31) capable of moving toward and away from the lens (11) by moving the first connecting means (41) in the front-back direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical reading device.

[0002]

[Prior Art]

 FIG. 5 shows a schematic configuration of a conventional optical reading device. In the figure, reference numeral 2 denotes a light source for irradiating the original P with the light L. The light L emitted from the light source 2 is reflected by the document P and enters the image reading sensor 21 via the reflection mirrors 3, 3 and the lens 11. Then, the image reading sensor 21 converts the signal into an electric signal, and the image is read based on the signal.

Specifically, as shown in FIG. 3, the lens 11 is attached to a predetermined position of the main body frame 1 via a lens holder 12. Further, the wiring board 22 provided with the image reading sensor 21 is supported at a predetermined position of the main body frame 1 via the connecting means 31 so as to be movable in the front-back, horizontal, vertical and left-right roll directions with respect to the lens 11. There is.

The connecting means 31 is composed of a mounting bolt 32, a nut 34, a spring 35, and the like. Here, as shown in FIGS. 3 and 4, a plurality of (for example, three) mounting bolts 32 are arranged on the main body frame 1 at predetermined intervals. The wiring board 22 is movably supported by these mounting bolts 32 in the front-back direction (arrow X direction), the horizontal direction (H direction), the vertical direction (V direction), and the left and right roll directions (R1 and R2 directions). A spring 35 is mounted between the wiring board 22 and the boss portion 32a of each mounting bolt 32 via a washer 36. Therefore, the wiring board 22 can be moved in the front-rear direction (X direction) by screwing the nut 34 into the threaded portion 33 of each mounting bolt 32 and rotating the nut 34 appropriately. In addition, the wiring board 22 is slightly moved in the horizontal direction (H direction), the vertical direction (V direction) and the left and right roll directions (R1 and R2 directions) on the plane orthogonal to the plane of FIG. (Therefore, the mounting posture of the image reading sensor 21) can be changed.

However, in the above-mentioned optical reading apparatus, in order to perform the focus adjustment and the optical path adjustment, the focus adjustment is first performed before the optical path adjustment. That is, the focus adjustment is performed by rotating the nuts 34 against the elasticity of the springs 35 so that the wiring board 22 (and therefore the image reading sensor 21) is appropriately moved toward and away from the lens 11.

In this way, when the focus adjustment is completed, the wiring board 22 is slightly moved in the horizontal direction (H direction), the vertical direction (V direction), and the left and right roll directions (R1 and R2 directions). Align the light receiving surface with the ideal optical path.

[0007]

[Problems to be solved by the device]

 By the way, in the above-mentioned optical reading device, when the optical path is adjusted, the wiring substrate 22 is moved in the horizontal direction or the like, so that the focus may be out of focus during the optical path adjustment. If such a situation occurs, it will take time and effort to start over from focus adjustment.

In view of the above circumstances, an object of the present invention is to provide an optical reading device capable of performing focus adjustment and optical path adjustment easily and accurately.

[0009]

[Means for Solving the Problems]

 The present invention relates to an optical reading device including a light source for irradiating an original with light and a wiring board provided with an image reading sensor for converting light reflected from the original and passing through a lens into an electric signal, wherein the wiring board A first connecting means for movably supporting the lens in horizontal, vertical, and left-right roll directions, and a second connecting means for moving the first connecting means in the front-rear direction so that the second connecting means can approach and separate from the lens. It is characterized by

[0010]

[Action]

 In the present invention, in order to perform focus adjustment and optical path adjustment, first, the second connecting means is used to move the wiring board (image reading sensor) in the front-rear direction through the first connecting means to the lens. The focus is adjusted by appropriately approaching and separating. Next, while the first connecting means is locked, the second connecting means is used to slightly move the wiring board in the horizontal, vertical, and left-right roll directions, so that the light receiving surface of the image reading sensor is aligned with the ideal optical path. .. At this time, since the first connecting means is locked and the image reading sensor does not move in the front-back direction, the focus does not get out of focus. As described above, since the focus adjustment and the optical path adjustment can be separately performed using the first and second connecting means, both adjustments can be easily and accurately performed.

[0011]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the optical reading apparatus according to this embodiment includes a main body frame 1, a light source 2, a reflection mirror 3, a lens 11, a lens holder 12, an image reading sensor 21, a wiring board 22, a first connecting means 41, and The second connecting means (31) is included. The same components as those shown in FIGS. 3 to 5 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, as shown in FIG. 2, the first connecting means 41 moves the wiring board 22 (image reading sensor 21) horizontally (in the direction of arrow H) so that the optical path adjustment can be performed separately from the focus adjustment. It is a means for supporting so as to be movable in the vertical direction (V direction) and the left and right roll directions (R1, R2 directions). In this embodiment, the first connecting means 41 includes a set plate 42, collars 43 and 44, and a position adjusting screw 45, as shown in FIG. The set plate 42 is provided with an opening 42b for allowing the image reading sensor 21 to receive the reflected light (L) from the document P. Further, the set plate 42 is provided with a plurality of (three in the present embodiment) screw holes 42a at predetermined intervals. Further, a plurality of mounting holes 42d (three in this embodiment) are provided on the outer peripheral portion of the set plate 42 so as to correspond to the respective mounting bolts 32. Furthermore, the wiring board 22 is attached to the set plate 42 through the stupid holes 22a, the collars 43 and 44, the position adjusting screws 45, the screw holes 42a and the like provided in the board 22. .. The stiff hole 22a of the wiring board 22 is formed so that the position adjusting screw 45 can be inserted with some margin. Therefore, the wiring board 22 is temporarily fixed to the set plate 42 by using the position adjusting screws 45 and the like, and in that state, the board 22 is horizontally (H direction) or vertical on the plane orthogonal to the paper surface of FIG. It can be slightly moved in the direction (V direction) and the left and right roll directions (R1 and R2 directions).

On the other hand, the second connecting means is configured to move the first connecting means 41 in the front-rear direction (X direction) so as to move toward and away from the lens 11. In this embodiment, the second connecting means is formed by using the conventional connecting means 31 (the mounting bolt 32, the nut 34, the spring 35, etc.) in order to reduce the cost.

Next, the operation will be described. In order to adjust the focus and the optical path, first, the second connecting means (31) is used to move the wiring board 22 (image reading sensor 21) in the front-rear direction via the first connecting means 41 to the lens 11 as appropriate. The focus is adjusted by appropriately approaching and moving away from each other.

Next, with the first connecting means 41 locked, the second connecting means (31) is used to finely move the wiring board 22 in the horizontal, vertical, and left-right roll directions to move the image reading sensor 21. Align the light receiving surface with the ideal optical path. At this time, since the first connecting means 41 is locked and the image reading sensor 21 does not move in the front-back direction, the focus does not get out of focus.

As described above, since the focus adjustment and the optical path adjustment can be performed separately by using the first and second connecting means (31) and 41, both optical path adjustments can be performed easily and accurately. it can.

Further, since the wiring board 22 is not directly moved in the front-rear direction by using the nuts 34, the warp at the time of focus adjustment can be made extremely small as compared with the conventional case. Adjustment can be performed easily and accurately.

[0018]

[Effect of the device]

 According to the present invention, the first connecting means for supporting the wiring board so as to be movable in the horizontal, vertical, and left-right roll directions, and the first connecting means can be moved in the front-rear direction to approach and separate from the lens. Since the second connecting means is provided, focus adjustment and optical path adjustment can be performed separately, and both adjustments can be performed easily and accurately.

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a view showing how the position adjusting bolt is attached.

FIG. 3 is a diagram for explaining focus adjustment / optical path adjustment in a conventional optical reading device.

FIG. 4 is a plan view of a conventional optical reading device.

FIG. 5 is a diagram showing a schematic configuration of a conventional optical reading device.

[Explanation of symbols]

 2 light source 11 lens 21 image reading sensor 22 wiring board 31 connecting means (second connecting means) 41 first connecting means

Claims (1)

Claims for utility model registration: 1. A light source for irradiating a document with light, and a wiring board provided with an image reading sensor for converting light reflected from the document and passing through a lens into an electric signal. In the optical reading device, a first connecting means for movably supporting the wiring board in horizontal, vertical, and left-right roll directions, and moving the first connecting means in the front-rear direction can approach and separate from the lens. An optical reading device comprising a second connecting means.