JPS61237569A - Scanner device - Google Patents

Abstract

PURPOSE:To correct contraction of an image data in the direction perpendicular to that of main scanning of a line sensor due to the inclination of an original by controlling the relative speed of the line sensor and the original in accordance with the amount of variation in the hight of the original from the surface plate. CONSTITUTION:A hight measuring part 303 calculates the amount of variation DELTAL1 of the distance between the original 101 and a lens 102 from the output from the line sensor 103 in a state where a flat light source 104 is turned off and a beam light source 105 is turned on, and outputs the result. The DELTAL1 occurrs from the variation in Z-direction of the original. A speed controlling part 301 calculates the inclination dL1/dy of the original 101 from the variation amount DELTAL1 in Z-direction of the original associating with the variation DELTAy in y-direction of the relative position of the line sensor 103 and the original 101, and calculates a speed-command value V based on the result of said calculation, and outputs it. By the value V, the relative speed of the sensor and the original is commanded. Accordingly, a drive part 302 moves the line sensor 103 or the original 101 at the speed of V.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scanner device, and particularly to a scanner device for inputting image data from books and the like.

[Conventional technology]

As shown in the fifth factor, the conventional scanner device
The entire surface of the original 10 is illuminated by a flat light source 104.
1. The image on the top is shown by the lens 102 and the terrain senna 103.
image and convert it into an electrical signal.

Scanning in the X direction is electrically performed by the line sensor 103K, and scanning in the y direction is performed by moving the original 101 or the line sensor 1o3 and the edge of the lens 102 in the y direction at a constant speed. In this way, two-dimensional image data covering the entire surface of the original 101 is input.

[Problems to be Solved by the Invention] The above-mentioned conventional scanner device has no problems when the document is flat and has no undulations in two directions, but when the document is flat and has no undulations in two directions, it has no undulations. In some cases, the read image data shrinks in the y direction depending on the magnitude of the y direction differential of the height in two directions on the surface of the original, resulting in the disadvantage that image data without distortion can rarely be obtained. .

[Means for solving problems]

The scanner device of the present invention includes a flat light source located above the document and irradiating the entire surface of the document, a beam light source located above the document and irradiating a narrow area of the document, and an image gIt on the document.
- a lens for forming an image, and a lens for forming an image through said lens;
a line sensor that converts dimensional image scratches into an electrical signal and outputs it; and a document height that measures the height of the document by measuring the position of a light spot generated on the document by the beam light source using the lens and the line sensor. a measuring unit; and a speed control system that controls the relative speed between the line sensor and the original in a direction perpendicular to the scanning direction of the line sensor in accordance with the amount of change in the height of the original measured by the original height measuring unit. Of course, it consists of

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The first is a perspective view showing an embodiment of the present invention, the second is a sectional view thereof, and the third (8) is a perspective view. In FIG. 1, an image on a document 101 is illuminated by a flat light source 104 and is illuminated by a two-in sensor 103 by a lens 102.
image and is converted into an electrical signal.

The beam light source 105 has a light beam 106 emitted from it, a light receiving element array of the line sensor 103 (arranged in the X-axis direction in the first factor), and an optical axis 108 of a lens (in the first factor, arranged in the two-axis direction). The light beam 106 forms a spot 107 on the original 101.
The spot 107 forms an image 201 on the line sensor 103 through the lens 102. Figure 2 shows m1
FIG. 2 is a cross-sectional view in plane A of the figure. When L is the distance between the document 101 and the lens 102, the distance between the lens 102 and the 2-in sensor 103, and the inclination of the θ-ge light beam 106 with respect to the two axes, when the distance Ll changes, the optical axis 108 of the spot 107 The amount of change Δ11 in distance/1 is as follows.

Changes by Δt1=ΔL1·tanθ (1). However, in formula 11, ΔL1h distance L1
is the amount of change. Distance 1. According to the change, the distance t2 between the image 201 on the line sensor 103 and the optical axis 108 also changes as follows.

Δt2ki(L2/Ll)・Δtl=ΔL1・(L2/L
l)・tan6・・・・・・(2) Changes in height. However, in equation (2), Δt2 is a change of 1 in distance t2. Since Ll s L2 #θ is a design feature of the scanner device of the embodiment, if Δt22 can be determined, ΔLl can be easily determined.

In FIG. 4, the flat light source 104 is turned off, and the beam light source 10
5 is a waveform diagram of an image signal output from the line sensor 103 when the line sensor 5 is turned on. FIG.

The time t at which the peak 401 caused by @201 appears
changes in proportion to the distance t2. Therefore, by measuring time t, ΔL1t- can be determined.

Next, the operation of each part will be explained using a block diagram illustrating a control method of the embodiment of the present invention shown in FIG.

The height measurement unit 303 turns off the flat light source 104 and measures the line sensor 10 with the beam light source 105e turned on.
3, the amount of change ΔLlt in the distance Ll between the original 101 and the lens 102 is determined by the method described above.
Calculate and output. ΔL1 is caused by a change in the height of the original 101 in two directions. The speed control unit 301 is connected to the line sensor 103,! : The inclination dLt of the original 101 is determined as follows by the amount of change ΔL1 in the height of the original 101 in two directions due to the change Δy in the relative position with respect to the original 101 in the y direction.
/dyt is calculated, and then a speed command value vf is calculated and output.

ΔLt/Δy in di,,/dy... (3
) v=vo/-Jl + (dl, 1/dy)
-t4i Speed command value V is line sensor 103 and document 10
1, and vo is a speed command value when scanning a flat document.

The driving unit 302 moves the original 101 or the 2-in sensor 103 and the lens in the ty direction at a speed of 3v in accordance with the speed command value V.

When moving, the flat light source 104 and the beam light source 105'
iTurn on and off alternately. Two-dimensional image data covering the entire surface of the original 101 is input to the image memory 304 by storing image signals output from the line sensor 103 in the image memory 304 with the flat light source 104 turned on and the beam light source 105 turned off. I can do it.

〔Effect of the invention〕

The scanner device t of the present invention controls the relative speed between the line sensor and the original according to the amount of change in the original, in the direction perpendicular to the scanning direction of the line sensor, that is, in the y direction in FIG. Even if the height of the document changes in two directions, the shrinkage of the image data in the y direction due to the inclination of the document can be corrected, so the effect is that image data can be obtained without distortion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
3 is a block diagram for explaining the control method, and FIG. 4 is a sectional view of the line sensor 10 shown in FIG. 1.
3 is a waveform diagram of the output image signal, and FIG. 5 is a perspective view showing a conventional example. 101... Manuscript, 102... Lens,
103... Line sensor, 104...
Flat light source, 105...Beam light source, 106
...Flux of light, 107...Spot, To, 10
8... Optical axis, 201... Subbo, G10
Image 7, 301...Speed control section, 302...
... Drive section, 303 ... Height measurement section, 304
・・・・・・Image memory. 401---Peak of image signal, vmax
... Maximum voltage of the image signal, A ... Surface including the optical axis 108 and the light receiving element row of the line sensor 103, x*Y*" ... Coordinate axis, L
leI72 s Alt L2...Distance, θ・
... Yuken, V ... Speed command koshiki, 1...
. . . Image signal, ΔL1 . . . Amount of change in distance between original 101 and lens 102. Figure 4

Claims (1)

[Claims] A flat light source located above the document illuminates the entire surface of the document; a beam light source located above the document illuminates a narrow area of the document; a lens that forms an image on the document; and a beam light source that illuminates the entire surface of the document. a line sensor that converts a one-dimensional image into an electrical signal and outputs it; and a document height that measures the height of the document by measuring the position of a light spot generated on the document by the beam light source using the lens and the line sensor. a measuring section; and a speed control section that controls the relative speed between the line sensor and the document in a direction perpendicular to the scanning direction of the line sensor in accordance with the amount of change in the height of the document measured by the document height measuring section. A scanner device comprising: