JPS59200239A - Color scanner - Google Patents

Abstract

PURPOSE:To obtain a small-sized color scanner with high-operability by reading highly precisely the original of a colored picture or the like by transmission or reflection and combining the rotation of a cylindrical filter with a linear solid- state image sensor to obtain various features. CONSTITUTION:The light from a light source 21 provided in a stage 1 is focused as a transmitted light 22 of an original 23 onto a one-dimensional solid-state image sensor 26, which is arranged orthogonally to the linear moving direction of the stage 1, by an optical lens 24. The transmitted light 22 passes a cylindrical filter 25 which can store the image sensor 26 internally and has a filter group, which decomposes the color picture into primary colors, combined into a cylindrical shape and is attached to a motor 27 rotated uniformly by a control circuit 28 and an encoder 29. R, G, and B filters are divided equally and are combined into a cylindrical shape. The relation between the rotation timing of the cylindrical filter 25 and the timing of the photoelectric conversion cycle of the one-dimensional image sensor 26 is set to a certain value. Thus, the color picture read in, for example, a cycle Rn is converted photoelectrically by the image sensor 26 and is read out as DRn in the cycle following the cycle Rn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color scanner for color reading a document using a one-dimensional solid-state image sensor.

Conventionally, in scanners that color-separate and photoelectrically convert originals containing colored images, the original is wrapped around a rotating drum, and a dichroic mirror splits spot light into red (R1, green (G), and blue). (B) A color image scanner that uses three sets of color filters and a photomultiplier to read and scan images with three solid-state image sensors;
There were also scanners that repeatedly scanned a document three times and changed filters of various types each time.

Furthermore, in recent years, there have been color television imagers and the like that rely on a combination of a diffraction filter and an imaging device.

However, the one-type drum scanner has a slow reading speed, and the one using three image sensors has difficulty adjusting the three primary colors, requiring three times as many image sensors and drive circuits. The method that repeatedly scans three times required repeatability of the scanning system and had a slow reading speed. Furthermore, it must be said that it is currently difficult to receive images over a wide area with high resolution using a color television image pickup device.

SUMMARY OF THE INVENTION The present invention provides a color scanner that can scan documents containing colored images with high accuracy by transmission or reflection, is easily miniaturized, and has good operability.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking a transmissive type movable original as an example.

FIG. 1 shows an overall overview of a color scanner showing an embodiment of the present invention. A stage 1 is provided with a light source for transmission, supports an original on a flat surface, and is movable in a straight line; an optical system for forming an image of the transmitted light of the original; a part of a sensor using a one-dimensional solid-state image sensor; and a stage 1. It consists of a color scanner main body 2 containing a scanning motor, etc., and an operation switch 3 for operating these. FIG. 2 shows a part of the optical system and sensor of the color scanner of the present invention. Light emitted from a light source 21 provided inside the stage in FIG. 1 is imaged by an optical lens 24 as transmitted light 22 of the original onto a one-dimensional solid-state image sensor 26 arranged perpendicular to the direction in which the stage 1 moves. do. First, the transmitted light 22 is transmitted through a control circuit 2 which can house a one-dimensional solid-state image sensor 26 inside, and which combines a group of filters in a cylindrical shape for separating a color image into primary colors.
8 and a cylindrical filter 25 attached to a motor 27 which is rotated at a constant rate by an encoder 29.

Figure 3G~), tB) are colored images in red jR1,
Cylindrical filter 2 that separates the primary colors into green (Gl, blue CB+)
An example of No. 5 is shown below. +A+ in FIG. 3 shows the outline of the cylindrical filter 25, R filter 251, G filter 252, B
Filters 253 are combined into a cylindrical shape. Rin 3 (
13) is a developed view of the cylindrical filter 25 shown in FIG.

The relationship between the rotation timing of the cylindrical filter 25 and the photoelectric conversion cycle of the one-dimensional solid-state image sensor 26 is shown in Figure 4) to (D+).The cylindrical filter
'□25 consists of color filters of three primary colors, R filter 251, G filter 252, and B filter 253 shown in FIG. 3. As shown in FIG. This shows the timing when At this time, n in Rn, Gn, and Bn shown in the figure represents the cycle of the cylindrical filter 5 that rotates once. Fourth
The timing of the Rn, Gn, and Bn color filters shown in the figure relative to the one-dimensional solid-state image sensor 26 can be found from the timings LB) and [C) produced by the two output signals of the encoders shown in FIG.

FIG. 4(B) shows the timing at which the R, G, and B color filters of the cylindrical filter 25 are switched by the rotation of the motor 27. FIG. 4(C) shows timing representing one revolution of the cylindrical filter 25. FIG. (D) is output data DRn, DG that has been photoelectrically converted after passing through Rn, Gn, and Bn color filters in the -dimensional solid-state image sensor 26.
n.

The timing of DBn is shown. For example, the color image read in the Rn cycle is captured by the one-dimensional solid-state image sensor 2.
6 is photoelectrically converted and the output data DR is output in the next cycle.
n. On the other hand, the stage 1 shown in FIG. 1 can read a color image of % of the original by driving and scanning a pulse smoke or a servo motor in synchronization with the timing shown in FIG. 4 (C). Stage 1 is driven by the feed hole screw and stepping motor or D
This can be easily accomplished by those skilled in the art by using a precision positioning table in combination with a C motor or the like, and a detailed explanation will be omitted.

Conversely, the stage that supports the original on a flat surface is integrated and fixed with the main body of the color scanner, and the light source, optical system, and one-dimensional solid-state image sensor are mounted on the precision positioning chifur to perform A-turbo scanning. is also easily possible.

FIG. 5 shows the optical system and sensor section of a color scanner according to the present invention as a second embodiment. The operation is similar to the embodiment shown in FIG. Therefore, by utilizing the shape of the cylindrical filter 25, an encodeable mark 30 for rotational position detection is provided on the cylindrical filter 25, and the rotational position detection sensor 31 detects the rotational position as shown in FIG. M4 (B).

The output signal for creating the timing shown in (C) can be easily generated, and the motor 2 can be easily generated without using the encoder 29 shown in FIG.
Since only the rotation of 7 can be controlled, the device can be simplified.

As a third embodiment, FIG. 6 shows a developed view of a cylindrical filter in which a light shielding portion is provided at the boundary between each filter in order to correct uneven rotation of the cylindrical filter. In the cylindrical filter 25 as shown in FIG. 3, an R filter 251,
The boundary width of each of the G filter 2 and the B filter 253 is narrow, and the rotational unevenness of the cylindrical filter 25 due to the rotational unevenness of the motor 27 and the photoelectric conversion cycle of the one-dimensional solid-state image sensor 26 are very precisely synchronized. Therefore, the 6th
As shown in the figure, an R filter 251 and a G filter 252
, B filters 253 are provided with an interval that serves as a light shielding portion 250 at the boundary portion of each. With this, the photoelectric conversion cycle of the one-dimensional solid-state image sensor 26 is switched while the light-shielding part 250 passes over the one-dimensional solid-state image sensor 26.
It is possible to easily synchronize the rotational unevenness of the cylindrical filter 25 with the photoelectric conversion cycle.

As a fourth embodiment, R, G of a one-dimensional solid-state image sensor
, 11 is a developed view of a cylindrical filter that performs sensitivity correction for , 11. - For example, if the sensitivity of a -dimensional solid-state image sensor to blue (CB) is poor to red (R) and green (G), B
Filter 253, R filter 251, G filter 252
Wider in the direction of rotation compared to . This results in
The B filter 253 passes over the scanning line of the -dimensional image sensor 26 over a long period of time, and a large amount of B C can be accumulated.

As a fifth embodiment, when a cylindrical filter rotates once and a color image is read, the stage is moved in the same manner as the cylindrical filter rotates! FIG. 8 shows a developed view of the cylindrical filters that can be easily removed. 12 Sep I (filter 2
51. If the G filter 252, the B filter 253, and the cylindrical filter 25 are rotating, the boundary spacing 250'' between the cylindrical filter 251 and the B filter 253 as shown in FIG. It's okay if you decide depending on the balance.

As a sixth embodiment, FIG. 9 shows a developed view of a cylindrical filter that can reduce the rotational speed of the motor that rotates the cylindrical filter. For example, as shown in the ninth section, R filter 251, G
By providing two filters 252 and two B filters 253, the rotational speed of the motor 27 is reduced to one-half. This reduces the vibration caused by the motor 27,
The lifespan of Tanabata 27 can be extended. It is also easy to make the rotational speed of the motor 27 the same as that of the corresponding one-dimensional image sensor.

As a seventh embodiment, primary color components provided in a cylindrical filter are
It is also possible to use a filter other than the folding filter, such as an ultraviolet cut filter.

As described above, various features can be obtained by combining the rotation of the cylindrical filter and the one-dimensional solid-state image sensor. You can easily combine the special requests of the literary names.

Furthermore, since the cylindrical filter is constantly rotating,
The inhomogeneity of the evening light is alleviated by the light weight of the one-dimensional solid-state image sensor; the averaging of the fractional effect of vermilion within the conversion time.

[Brief explanation of the drawing]

FIG. 1 is an overall overview of a color filter and a printer showing an embodiment of the present invention. FIG. 2 is a block diagram showing an i- embodiment of the optical system of a part of the scanner of the color scanner of the present invention. Fig. 3 iAl, (Bl is a diagram showing an example of a cylindrical filter that separates a color image into primary colors of R, G, and H. Fig. 4 cA), tB+, (c)
, ID) is a diagram showing the timing relationship between the rotation timing of a cylindrical filter and the photoelectric conversion cycle of a one-dimensional solid-state image sensor. Figure 5 shows a diagram of the optical system and sensor section of a color scanner as an example. Figures 6 to 9 show the cylindrical filter Q). In the figure, l is a stage, 2 is a main body of the y-ray scanner, 3 is an operation switch, 21 is a light source, 22 is a transmitted light, 2
3 is a document, 24 is an optical lens, 25 is a cylindrical filter, 2
6 is a one-dimensional solid-state image sensor, 27 is a motor, 28 is a control circuit, 29 is an encoder, 30 is a mark, a representative,
+P,, 4i soup ``1 misfortune ぢ・11. La 60th q ward 3rd figure

Claims (1)

[Claims] 1. A stage that supports a document on a flat surface and is movable in a straight line;
a light source that transmits or reflects the original; an optical system that forms an image of transmitted light or reflected light of the original; and a stage that is arranged at a position where the optical system forms an image of the original, and that the stage is linearly movable. A one-dimensional solid-state image sensor that scans in a direction perpendicular to a direction to obtain a video signal, and a group of filters that can house the above-mentioned -dimensional solid-state image sensor and separate a color image into primary colors are combined in a cylindrical shape and rotated at a constant rate. A color scanner featuring 2. The color scanner according to claim 1, wherein a stage supporting the original on a flat surface is fixed, and a light source, an optical system, and a one-dimensional solid-state image sensor are movable relative to the stage in conjunction with each other.