JPH10185690A - Two-color sensor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-color sensor capable of judging the color component of a printed matter printed with a plurality of colors at a high speed. SOLUTION: This two-color sensor 1 has light sources 2, 3, first and second deflecting plates 4, 5 arranged between the light sources 2, 3 and a matter to be measured O, an objective lens 6 for imparting a prescribed converging property to the reflected light reflected by the matter to be measured O, first and second optical detectors 7, 8 for receiving the light transmitted through the objective lens 6 and outputting an electric signal corresponding to the luminous intensity of the received light, and third and fourth deflecting plates 9, 10 arranged between the first and second optical detectors 7, 8 and the matter to be measured O (objective lens). The deflecting direction of the first and third deflecting plates 4, 9 and the deflecting direction of the second and fourth deflecting plates 5, 10 are set to the same direction, respectively. The deflecting direction of the first and third deflecting plate 4, 9 and the deflecting direction of the second and fourth deflecting plates 5, 10 are set to directions mutually differed by 90 deg., or mutually orthogonal directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-color sensor used for recognizing printed matter, for example, bills.

[0002]

2. Description of the Related Art For example, in a financial institution such as a bank, a paper sheet processing apparatus used for counting or bundling of banknotes is used to print front and back of banknotes conveyed in the apparatus, a characteristic portion of printing, or a specific color material. It has an inspection unit that detects and determines the authenticity of the bill.

In the inspection section, for example, a two-color sensor for detecting a specific character and color printed on a bill is used. Conventionally, as a two-color sensor, a color filter system and a light source blinking system are known.

In the color filter system, as shown in FIG. 3, light generated from a first light source 101 and a second light source 102 in a two-color sensor 100 is reflected by a measurement object 103 by a lens 104. The light is condensed, and the first color filter 105 and the second color filter 106 are respectively supplied to the first photodetector 107 and the second photodetector 108 by using the first color filter 105 and the second color filter 108. The light whose specific color is blocked by the color filter 106 is made incident to detect the color of the measurement object 103.
The first color filter 105 has a predetermined filter characteristic capable of mainly transmitting the light of the color emitted from the first light source 101, and the second color filter 106 has a predetermined filter characteristic mainly for the second light source 102. Each of the predetermined filter characteristics capable of transmitting the light of the color that emits is given. Further, as the light source, one light source that generates light including light of a color that can be transmitted by each of the first color filter 105 and the second color filter 106 may be used.

According to such a two-color sensor 100, the first light detector 107 emits light of the color generated by the first light source 101, and the second detector 108 emits light of the second light source 102.
Are converted into electric signals. Each light source is simultaneously turned on (emitted).

In the light source blinking method, as shown in FIG. 4, a first light source 201 and a second light source 202 in a two-color sensor 200 are turned on alternately, and light from each light source is reflected by an object 203 to be measured. The reflected light is collected by a lens 204 and made incident on a photodetector 205 to detect the color of the measured object 203. At this time, only the light generated from either the first light source 201 or the second light source 202 is input to the photodetector 205, and as a result, the photodetector 205 outputs the first light source 201 or the second light source 202. The second light source 202
An electrical signal corresponding to the color of light from any of the above is output.

That is, in the light source blinking method, the first light source 201 or the second light source 2
02 is alternately incident on the light generated from
The color of the measured object 203 is detected only by the two light detectors 205.

[0008]

However, in the above-described color filter system, as shown in FIG.
As a characteristic of the color filter, a part of light of a color other than the desired color is transmitted, so that there is a problem that the resolution is reduced. In particular, when the colors of light generated from the first and second light sources are relatively close to each other, the transmittance of light of a color other than the desired color increases, and the available light source There is a problem that limits the light emission characteristics (color) of the light emitting device.

On the other hand, the light source blinking method has a better color resolution than the above-described color filter method, but has a problem that the speed cannot be increased because two colors are read alternately. SUMMARY OF THE INVENTION It is an object of the present invention to provide a two-color sensor capable of determining a high-speed color component of a printed matter printed in a plurality of colors.

[0010]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned problems, and has a first light source for generating light of a first color and a light source for deflecting light generated from the first light source. A first deflecting plate, a second light source for generating a second color light different from the first color light, and a second light source for deflecting the light generated from the second light source. A deflecting plate, of the first color light and the second color light deflected by the first deflecting plate or the second deflecting plate and reflected by the object to be measured,
A third deflecting plate provided to pass only the first color light, a fourth deflecting plate provided to pass only the second color light, and the third deflecting plate. A first detector for detecting the light of the first color that has passed therethrough, and a second detector for detecting light of the second color that has passed the fourth deflection plate. A two-color sensor device is provided.

Further, the two-color sensor device of the present invention has a first
Each of the deflecting plates is arranged so that the deflecting directions of the deflecting plate and the third deflecting plate coincide with each other, and the deflecting directions of the second and fourth deflecting plates coincide with each other.

Further, in the two-color sensor device according to the present invention, the deflection directions of the first and third deflection plates are different from the deflection directions of the second and fourth deflection plates by approximately 90 °. Characterized by being arranged in

Still further, the two-color sensor device of the present invention is provided between the object to be measured and the third and fourth deflecting plates, and the light of the first color reflected from the object to be measured. Further, a lens for condensing the light of the second color is further provided.

Further, the present invention relates to an optical sensor comprising two types of monochromatic light sources and two photodetectors, one immediately after each monochromatic light source and one immediately before each photodetector. A two-color sensor device in which a deflecting plate is placed, and the deflecting direction of the deflecting plate is the same between the pair of the light source and the photodetector, and the deflecting direction of the deflecting plate is different by 90 ° between the pair. It is.

Still further, according to the present invention, a first light source emits light of a first color, and the first color light is deflected by a first deflector to irradiate an object to be measured, and The second light source emits a light of a second color different from the light of the first color, and the light of the second color is deflected by a second deflector to irradiate the object to be measured. Of the light of the first color and the light of the second color reflected by the object to be measured, only the light of the first color passes through the third deflecting plate, and the light of the first color passes through the fourth deflecting plate. Only the light of the second color is allowed to pass, the light of the first color is detected by the first detector, and the light of the second color is detected by the second light detector. And a method for detecting color separation of two-color light.

Further, in the color separation detecting method for two-color light according to the present invention, the deflection directions of the first and third deflection plates are made to coincide with each other, and the deflection directions of the second and fourth deflection plates are adjusted. Are arranged so that the light of the first color and the light of the second color applied to the object to be measured are color-separated.

Still further, in the color separation detecting method for two-color light according to the present invention, the deflection directions of the first and third deflection plates and the deflection directions of the second and fourth deflection plates are different from each other by approximately 90 °. The first color light and the second color light applied to the object to be measured are color-separated.

Further, in the color separation detecting method for two-color light according to the present invention, the first color light and the second color light reflected by the object to be measured are condensed by a lens and then the second color light is condensed. It is characterized in that it is directed to the third deflecting plate and the fourth deflecting plate.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an example of a two-color sensor incorporated in a banknote processing apparatus used in a financial institution such as a bank, to which the embodiment of the present invention is applied.

As shown in FIG. 1, the two-color sensor 1 has a first color light generating a different color (wavelength range), for example, a red light.
Light source 2 and a second light source 3 for generating green light, first and second deflection plates 4 and 5, which are arranged between the respective light sources 2 and 3 and a measurement object (detection target) O, First
And an objective lens 6 for giving predetermined convergence to the reflected light reflected by the measurement object O after passing through the second deflecting plates 4 and 5, receiving the light passing through the objective lens 6, and receiving the light. The first light detector 7 and the second light detector 8 that output an electric signal corresponding to the intensity, and each of the first and second light detectors 7 and 8 and the object to be measured O (objective lens 6) Third deflecting plate 9 and fourth deflecting plate 1 disposed between
0 and a control unit not described in detail.

In the two-color sensor 1 shown in FIG. 1, the directions of deflection of the first and third deflection plates 4 and 9 are set in the same direction. The directions of deflection of the second and fourth deflection plates 5 and 10 are respectively
They are set in the same direction. The direction of deflection of the first and third deflection plates 4 and 9 and the direction of deflection of the second and fourth deflection plates 5 and 10 are different from each other by 90 degrees, that is, in directions orthogonal to each other. ing.

The red light emitted from the red light source (first light source) 2 is input to the first deflecting plate 4. The first deflection plate 4 is
The direction of deflection transmits only linearly polarized light directed in a certain direction. If the angle (direction) of this deflection is -45 °, the light passing through the first deflection plate 4 is deflected by -45 °. It becomes light. This light is reflected by the object to be measured O, collected by the lens 6, and made incident on each of the third deflecting plate 9 and the fourth deflecting plate 10.

The direction of deflection of the third deflecting plate 9 is -45 ° similarly to the first deflecting plate 4, and the direction of deflecting of the fourth deflecting plate 10 is the same as that of the first deflecting plate 4. Is set at 45 ° shifted from the direction of the deflection of the first deflecting plate 4 by 90 ° with respect to the direction orthogonal to the direction of the first deflecting plate 4. Although it can pass through the plate 9, it cannot pass through the fourth deflection plate 10.

Therefore, the red light is supplied to the first photodetector 7
And is converted into an electric signal, but does not reach the second photodetector 8 and is not converted into an electric signal. -Way,
The green light emitted from the green light source (second light source) 2 is shifted by 90 ° with respect to the direction orthogonal to the direction of deflection of the first deflecting plate 3, that is, the direction of deflection of the first deflecting plate 4. By passing through the second deflecting plate 5 in which the direction of deflection is set so as to pass through the deflecting light of 45 °, deflection of 45 ° is obtained.

Like the red light, the green light is also reflected by the object O, collected by the lens 6 and then transmitted to the third deflecting plate 9 and the fourth deflecting plate 9.
To the respective deflection plates 10. The green light is 45
Since the polarized light is ゜, it can pass through the fourth deflecting plate 10 but cannot pass through the third deflecting plate 9.

Therefore, the green light is supplied to the second photodetector 8
And is converted into an electric signal, but does not reach the first photodetector 7 and is not converted into an electric signal. As described above, the first photodetector 7 converts only red light and the second photodetector 8 converts only green light into electric signals, so that the first and second light sources 2 and 3 are simultaneously turned on. By emitting light and irradiating the same position of the object O with red light and green light simultaneously, the red light reflected by the object O and the green light reflected by the object O are first and second lights. An output signal of a magnitude corresponding to the color of the image of the measurement object O at the measurement target position is obtained by the detectors 7 and 8.

As described above, the output signals output from the first and second photodetectors 7 and 8 are subjected to predetermined arithmetic processing by a control unit (not described in detail), so that the position of the object O can be measured. The color of the image can be specified.

The first and second photodetectors 7 and 8
The reflected light from the banknote detected in the above is separated into color components by a control unit (not described in detail), the ratio of each color component or the characteristics of the image is determined, and the authenticity of the banknote, the bill type (amount) Used for judgment and the like.

FIG. 2 shows the relationship between the directions of deflection of the first to fourth deflection plates 4 and 5, 9 and 10 in the two-color sensor 1 shown in FIG. 1 in detail. As shown in FIG. 2, the directions of deflection of the first and third deflection plates 4 and 9 are set to be the same, and the directions of deflection of the second and fourth deflection plates 5 and 10 are set to be the same. Is done.

On the other hand, the first and third deflection plates 4
As described with reference to FIG. 1, the directions of deflection of the second and fourth deflection plates 5 and 10 and the directions of deflection of the second and fourth deflection plates 5 and 10 are as follows.
They are oriented in directions orthogonal to each other.

What is important here is that the direction of deflection of each deflector only needs to be given a fixed relationship, and as shown in FIG. 2, the first deflector 4 and the third deflector 9 Of the pair (pair), the second deflection plate 5 and the fourth deflection plate 1
The deflection direction of the pair of zero (pair) is the same, and the deflection direction of the pair of the first deflection plate 4 and the third deflection plate 9 and the second deflection plate 5
And the direction of deflection of the pair of fourth deflection plates 10 is orthogonal, that is, the difference in the direction of deflection of each pair is 90
It is necessary to make the direction of deflection of each deflection plate uniform so that ゜.

Although the above description has been made using red light and green light, similar effects can be obtained with any other two colors. Although the example using reflected light has been described with reference to FIG. 1, a similar effect can be obtained even with a structure using transmitted light. Further, the same effect can be obtained with a line sensor or an area sensor as the form of the sensor.

[0033]

As described in detail above, according to the present invention,
A two-color sensor having high color resolution and capable of determining at high speed can be provided. Therefore, by using the reflected light of the banknote, in a banknote determination device that determines the denomination, direction, and authenticity of the banknote, the reflected light amount of the banknote is separated into color components, and the ratio of each color component is determined. , More accurate determination can be made.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a two-color sensor to which an embodiment of the present invention is applied.

FIG. 2 is a schematic diagram showing the relationship between the directions of deflection of first to fourth deflection plates in the two-color sensor shown in FIG. 1;

FIG. 3 is a schematic diagram showing a conventional example of a color filter type two-color sensor.

FIG. 4 is a schematic diagram showing a conventional example of a two-color sensor of a light source blinking type.

FIG. 5 is a schematic diagram illustrating an example of spectral characteristics of a color filter used in the color filter type two-color sensor illustrated in FIG. 3;

[Explanation of symbols]

 1 ... two-color sensor, 2 ... first light source, 3 ... second light source, 4 ... first deflecting plate, 5 ... second deflecting plate, 6 ... Objective lens 7 First photodetector 8 Second photodetector 9 Third deflecting plate 10 Fourth deflecting plate

Claims (9)

[Claims] A first light source for generating light of a first color; a first deflecting plate for deflecting light generated from the first light source; and a color different from the light of the first color. A second light source that generates light of a second color, a second deflecting plate that deflects light generated from the second light source, and the first deflecting plate or the second deflecting plate. Deflected,
And a third polarizing plate and a second color light provided to pass only the first color light out of the first color light and the second color light reflected by the measurement object. A fourth deflecting plate provided so as to pass only light, a first detector for detecting light of a first color passing through the third deflecting plate, and passing through the fourth deflecting plate A second detector for detecting the light of the second color. 2. The deflection plates of the first and third deflection plates are made to have the same deflection direction, and the deflection directions of the second and fourth deflection plates are made to match. 2. The two-color sensor device according to claim 1, wherein 3. The deflection directions of the first and third deflection plates and the deflection directions of the second and fourth deflection plates are substantially nine.
The two-color sensor device according to claim 2, wherein the two color sensor devices are arranged so as to have different deflection directions by 0 °. 4. A light of a first color and a light of a second color provided between the object to be measured and the third and fourth deflection plates and reflected from the object to be measured. 2. The two-color sensor device according to claim 1, further comprising a lens for condensing light. 5. An optical sensor comprising two types of monochromatic light sources and two photodetectors, wherein one polarizing plate is placed immediately after each monochromatic light source and immediately before each photodetector. A two-color sensor device, wherein the deflecting direction of the deflecting plate is the same between the pair of the light source and the photodetector, and the deflecting direction of the deflecting plate is different by 90 ° between the pair. 6. A first light source emits light of a first color, deflects the first color light by a first deflecting plate to irradiate the object to be measured, and emits light of a first color from a second light source. A second color light different from the first color light is emitted, and the second color light is deflected by a second deflecting plate to irradiate an object to be measured. Of the reflected light of the first color and light of the second color, only the light of the first color passes through the third deflecting plate, and the light of the second color passes through the fourth deflecting plate. Only the first color light is detected by the first detector, and the second color light is detected by the second light detector. Color separation detection method. 7. The respective deflection plates so that the deflection directions of the first and third deflection plates coincide with each other, and the deflection directions of the second and fourth deflection plates coincide with each other. 7. The color separation detection method for two-color light according to claim 6, wherein the first color light and the second color light applied to the object to be measured are color-separated. 8. The deflection directions of the first and third deflection plates and the deflection directions of the second and fourth deflection plates are substantially nine.
7. The two-color light according to claim 6, wherein the first color light and the second color light applied to the object to be measured are color-separated by arranging them so as to have different deflection directions by 0 °. Color separation detection method. 9. A first color light and a second color light reflected by the object to be measured are converged by a lens and then directed to the third deflection plate and the fourth deflection plate. 7. The method for detecting color separation of two-color light according to claim 6, wherein: