JPS59160370A - Adjusting method of reader - Google Patents

Abstract

PURPOSE:To adjust the positions of image pickup elements mutually by arranging patterns which differ in density about a boundary line consisting of points at equal distance to respective optical axes of lenses corresponding to image pickup elements at image pickup positions of a subject. CONSTITUTION:When a light shielding plate 3 is not provided, the outputs of the image pickup elements 1 and 2 are both electric signals of entire-surface white because of a white original 8. When the light shielding plate 3 is interposed, an electric signal of entire-surface black is obtained from the image pickup element 1 and the signal of entire-surface white is obtained from the image pickup element 2. Therefore, the mutual adjustment of the positions of the image pickup elements in the direction of an arrow A is made.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting a reading device that performs reading using a plurality of image pickup devices, and more particularly to a method for adjusting a reading device that adjusts the mutual positions of image pickup devices. .

In recent years, by arranging multiple one-dimensional solid-state image sensors such as COD in a -dimensional manner and sub-scanning an object such as a document in a direction perpendicular to the arrangement direction, it is possible to capture a time-series image corresponding to the document image. Reading devices that obtain electrical signals have been proposed.

However, if the distance between the two adjacent image sensors becomes close and the subject images are captured overlappingly, when the images are reproduced using electrical signals obtained from the image sensors, overlapping portions will also occur in the reproduced images. Further, if the distance between the adjacent image sensors is increased 17 and a part of the object image is not captured by either of the adjacent image sensors, part of the object image will not appear on the reproduced image. In order to prevent such a situation, it is possible to adjust the positions of the image sensors, but
For example, if the adjustment is performed using a document obtained by scanning a test document, it is time consuming and the accuracy is not very good.

In view of the above-mentioned points, the present invention achieves high accuracy in a short period of time.
The present invention aims to provide a method for adjusting a reading device that allows six adjustments. More specifically, by arranging patterns having different densities with respect to a line consisting of points having the same distance to each optical axis of each lens corresponding to each image sensor at the imaged position of the subject, the image sensors are mutually separated. An object of the present invention is to provide a method for adjusting the position of a reading device.

Hereinafter, the present invention will be explained based on illustrated embodiments. FIG. 1 is a perspective view for explaining this embodiment, and FIG. 2 is a plan view of the apparatus shown in FIG. 1.

Reference numerals 1 and 2 are solid-state imaging devices whose positions can be adjusted, and each has an imaging section 1a and 2a. Reference numeral 3 denotes a completely black light-shielding plate whose end is located on a straight line 9 consisting of equal points from each optical axis 6, 7 of lenses 4, 5. 8 is a white original. The white original 8 and the light-shielding plate 3 are mostly in place. The light shielding plate 3 is removable, but may be fixed if it does not interfere with imaging. If there is no light shielding plate 3, the image sensors 1 and 2
For both outputs, a completely white electrical signal is obtained. Furthermore, when the light shielding plate 3 is included, the image sensor 1 also obtains an entirely black electrical signal, and the image sensor 2 obtains an entirely white signal. Therefore, it is possible to perform nine mutual positional adjustments of the imaging elements in the direction of the arrow.

In other words, the adjustment is made by shifting the image sensor 1 in the direction of arrow A2 until a white signal appears as part of the image output electrical signal, then gradually shifting it in the direction of arrow AI, and returning it to the position where the white signal completely disappears. This is the completion point.

On the other hand, the adjustment completion point for the image sensor 2 is when it is shifted in the direction of arrow A4 to a position where a black signal appears as part of the image output electric signal, and then returned to the direction of arrow A3 until the black signal completely disappears.

In this embodiment, the light shielding plate 3 is placed in front of the white original, but for example, a straight line 9 equidistant from each optical axis may be placed at the edge of the original placing table 12 outside the image scanning area 11 as shown in FIG. Patterns 10 having different densities may be arranged at the border. Also, the density only needs to be different at the position of the straight line 9, and the entire surface is black,
It doesn't have to be all fun. Further, in this embodiment, two one-dimensional solid-state image sensors have been described, but the present invention is of course applicable to adjustment of a reading device having three or more one-dimensional solid-state image sensors.

FIG. 4 is an explanatory diagram of another embodiment of the present invention, and is a side view of the reading device, in which components having the same functions as those in FIG. 1 are given the same numbers.

In the figure, 15 is a mirror, 16 is an imaging plane whose distance from the image sensor 1°2 is equal to the distance to the original 8, and the imaging plane 16 has different densities along the boundary line, as in the previous embodiment. It has a pattern. By arranging the mirror 15 on the optical axis during adjustment, the image pickup device can be adjusted without using the original surface.

In other words, patterns with different densities may be arranged along a boundary line formed by points having equal distances not only to the document surface but also to the optical axes of the lenses at the optically imaged position.

As described above, in the present invention, adjustments can be made while observing the output electrical signals of the image pickup device with an extremely simple configuration, and the adjustments can be made with higher accuracy and in a shorter time than adjustments using test originals.

[Brief explanation of the drawing]

FIG. 1 is an explanatory perspective view of one embodiment of the present invention, FIG. 2 is a plan view of the apparatus shown in FIG. 1, FIG. 3 is a plan view of the document table, and FIG. It is a diagram. In the figure, 1.2 is a one-dimensional solid-state image sensor, 3 is a light shielding plate, 4 and 5 are lenses, and 6 and 7 are optical axes, respectively. Applicant Canon Co., Ltd. No. 37 12

Claims (1)

[Claims] In a method for adjusting a reading device having a subject, a plurality of linearly arranged one-dimensional solid-state image sensors, and an optical lens provided corresponding to each of the image sensors, each of the optical image pickup positions A reading device adjustment method for adjusting the mutual positions of the image pickup elements by arranging patterns of different densities with respect to a line formed by points having equal distances to two adjacent optical axes of lenses.