JP2002202265A - Rice grain quality level discrimination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice grain quality level discrimination device for discriminating the quality level of rice grains with high accuracy by making the number of light receiving means smaller than in the past and providing accurate information on grain thickness. SOLUTION: A light receiving means 17 is disposed in a position confronting one face part, either a flat face part or a side face part, of a rice grain conveyed by a conveying means 2 to a prescribed position. A deflection means 19 is disposed near the other face part to direct the light from the rice grain to the receiving means 17. A light inlet means 18 is disposed between the rice grain plus the deflection means and the receiving means 17 to inlet the light from the one face part confronting the receiving means 17 and the light from the deflection means 19 into the receiving means 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice grain quality discriminating apparatus for discriminating rice grains into a plurality of grades.

[0002]

2. Description of the Related Art Conventionally, this kind of rice grain quality discriminating apparatus has a transfer means for transferring rice grains, and an illumination for irradiating the rice grains with green light and red light to the rice grains transferred by the transfer means using a light emitting diode or the like. Means, a light-receiving sensor that detects light in a wavelength range A (for example, 670 to 680 nm) of red light obtained from the front side and / or the back side of the rice grain that has received the illumination light from the illumination means, and a wavelength range B of green light ( For example, 540-5
50 nm), a light receiving means having a light receiving sensor for detecting light of 50 nm, a quality determining means for determining the quality of the rice grain based on the detected light from the light receiving means, and a display for displaying a result of the determination by the quality determining means. The means provided are known. In this rice grain quality determining device, the quality determining means determines the rice grain to have a plurality of qualities based on the detected light quantity detected by the light receiving means and a light quantity ratio between the light quantity in the wavelength range A and the light quantity in the wavelength range B. Then, the judgment result is displayed.

[0003] Further, a light receiving means (RGB sensor) for emitting signals corresponding to respective light colors of red, green and blue is provided, and based on the signal from the light receiving means, rice grain is classified into a plurality of grades. An apparatus is also known (for example, see Japanese Utility Model Publication No. 7-33151).

[0004]

By the way, information on the thickness of rice grains cannot be obtained only by the light obtained from the front side and the back side of rice grains, and the grains having a thickness smaller than that of the sized grains are discriminated as immature grains. Despite the rice grain to be determined, it was identified as sized. For this reason, in recent years, a type that also obtains the thickness information of the rice grain and determines the quality of the rice grain has been developed.

For example, a rice grain quality discriminating apparatus described in Japanese Patent Application Laid-Open No. 6-174647 is provided with a plane information detecting unit comprising a light receiving sensor for obtaining so-called surface information on the front side of rice grains, A grain thickness information detecting unit is provided to obtain rice grain thickness information based on the amount of displacement of reflected light obtained from the front side in the direction of transport of the rice grains.

[0006] In addition to the apparatus disclosed in JP-A-6-174647, an apparatus disclosed in JP-A-2000-180369 is known as a rice grain quality discriminating apparatus for obtaining information on the thickness of rice grains. This is provided with a plane information detecting unit for obtaining surface information of the rice grain, and a light receiving sensor is arranged on the side of the rice grain so as to receive light from the side surface of the rice grain, and the light receiving sensor is provided with A grain thickness information detecting unit is provided which captures the side surface of the rice grain as an image based on the signal and obtains information on the thickness of the rice grain from the rice grain side image.

[0007] However, Japanese Patent Laid-Open No.
No. 7, the plane information detecting unit provided in the rice grain quality discriminating apparatus is configured such that the reflected light from the rice grain that has received the irradiation light from the irradiation unit including the laser diode enters any position of the light receiving sensor of the plane information detecting unit. The amount of displacement is detected depending on whether light is emitted, and information on the grain thickness of rice grains is obtained. However, the surface of the rice grain has an uneven shape, and the uneven shape differs for each rice grain. For this reason, the reflection angle of the reflected light is slightly different for each rice grain, and the position where the reflected light enters the light receiving sensor differs for each rice grain, and there is a concern that the grain thickness information of the detected rice grain is not accurate. .

Further, the rice grain quality discriminating apparatus disclosed in the above publication is provided with a grain thickness information detecting section for obtaining grain thickness information of rice grains as described above and a plane information detecting section for obtaining so-called plane information of rice grains separately. Therefore, the device cannot be made compact, and furthermore, a light receiving sensor is required for both the grain thickness information detecting section and the plane information detecting section, which not only increases the cost but also adjusts the position of each light receiving sensor. Was needed.

On the other hand, the rice grain quality discriminating apparatus described in Japanese Patent Application Laid-Open No. 2000-180369 captures a side portion of a rice grain as an image based on light incident on a light receiving sensor, and obtains grain thickness information of the rice grain from the image. In order to obtain the above,
The grain thickness information is more accurate than the rice grain quality discriminating apparatus disclosed in Japanese Patent No. 647, and the grain thickness information detecting section for obtaining grain thickness information of rice grains and the plane information detecting section for acquiring plane information of rice grains are not separately provided. Because it is composed of one block,
It is more compact than the device of 174647. However, the light receiving sensor is required for both the grain thickness information detecting unit and the plane information detecting unit, and thus not only costs are increased as described above, but also the position of each light receiving sensor needs to be adjusted.

In view of the above, the present invention provides a rice grain quality discriminating apparatus which reduces the number of light receiving means as compared with the prior art, and obtains accurate grain thickness information and discriminates the grain quality of rice grains with high accuracy. It is a technical issue.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a transfer means for transferring rice grains one by one, and a plurality of single-color rice grains at predetermined positions transferred by the transfer means. Irradiating means for irradiating light, light receiving means for receiving a plurality of monochromatic light from the rice grain received irradiation light from the irradiating means in a plurality of pixels and outputting a signal corresponding to each monochromatic light,
A rice grain quality discriminating device comprising: a rice grain quality discriminating means for discriminating rice grains into a plurality of grades based on a signal from each pixel of the light receiving means. And a diverting means for directing the light obtained from the rice grains to the light receiving means is disposed in the vicinity of the other surface part, and the diverting means is disposed in the vicinity of the other surface part. Light receiving means is provided between the light directing means and the light receiving means, the light from one surface of the rice grain facing the light receiving means and the light from the turning means being incident on the light receiving means, Taking the technical measures of that.

Accordingly, the rice grains transferred by the transfer means are irradiated with a plurality of monochromatic lights, for example, red light, green light and blue light from the irradiation means. The light of the rice grain from either the flat surface or the side surface facing the light receiving means enters the light receiving means (RGB image sensor) via the light entering means. On the other hand, the light from the other surface of the rice grain is changed in the direction of the light receiving unit by the turning unit, and enters the light receiving unit via the light input unit. The light receiving means sends a signal to the quality determining means in pixel units corresponding to the color of light obtained from the flat part and the side part of the rice grain. The quality discriminating means constructs an image of the rice grain based on the transmitted signal, obtains "front side information" and "grain thickness information" of the rice grain, and based on the "front side information" and "grain thickness information". To determine the quality. Thus, according to the present invention, the plane portion and the side portion of the rice grain can enter the same light receiving unit by configuring the turning unit. Further, since the "grain thickness information" is calculated based on the number of pixels on which the image of the rice grain side is constructed, it is accurate, and thus the quality of the rice grain can be determined with high accuracy.

The second aspect of the present invention takes the technical means that the diverting means and the diverting means are constituted by mirrors or prisms, and receives light from the side and flat portions of the rice grain. Suitable for entering the means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of a rice grain quality determining device 1 of the present invention. FIG. 2 is a plan view of a disk provided in the rice grain quality determination device. FIG. 3 is a side sectional view of the first optical detection unit 9. FIG. 4 is a side sectional view of the second optical detection unit 10. FIG. 5 is a block diagram of the quality determining means provided in the rice quality determining apparatus for determining the quality of rice grains. FIGS. 6 and 7 are side sectional views showing a modification of the first optical detection unit 9.

The rice grain quality discriminating apparatus 1 is provided with a transfer means 2 for transferring rice grains S one by one. The transfer means 2
Forms a recess 3 near the periphery to enable rice grains to be arranged,
Further, there is provided a disk 5 rotatable in the direction of arrow Q about the rotation shaft 4a. The bottom surface 3a of the concave portion 3 of the disk 5 is made of transparent glass. Below the disk 5 is the disk 5
A disk base 6 having substantially the same shape as that of FIG. A drive motor 4b (deceleration motor) for rotating the rotary shaft 4a is provided on the back surface of the disk base 6. The drive motor 4b is fixed to a base 8 together with the disk base 7, and the disk 5 and the disk base 6 are arranged in an inclined manner. A storage unit 7 for storing rice grains is provided at a lower part of the disk 5 at an inclined position.
The first optical detection unit 9 and the second optical detection unit 10 are disposed on the upper slope.

The "flat portion" used in the present invention indicates a surface of a rice grain having a long grain length, and the "side portion" indicates a surface in the grain thickness direction of the rice grain. The recess 3 is shaped such that the flat portion of the rice grain faces the front side of the disk 5.

The first optical detecting section 9 which is a characteristic component of the present invention will be described with reference to FIG. Each recess 3
Is formed of a transparent material, for example, transparent glass. This transparent outer peripheral portion 11 may be formed for each concave portion 3 or the entire outer peripheral edge of the disk 5 may be integrally formed in a ring shape. A space 12 is formed in a portion of the first optical detection unit 9 that overlaps the bottom surface 3a of the recess 3 of the disk base 6.

In the first optical detecting section 9, irradiation means for irradiating the rice grains in the recess 3 with light are arranged on the front side and the back side of the disk 5, respectively. On the front side of the disk 5, a red light emitting diode lamp 13 for irradiating red light and a green light emitting diode lamp 14 for irradiating green light are provided in the first optical detection unit 9.
It is arranged at a position above the recess 3 at a predetermined position (hereinafter, referred to as “first detection recess A”). on the other hand,
On the back side of the disk 5, a blue light-emitting diode lamp 15 for irradiating blue light is disposed below the first detection recess A. In addition, a diffusion plate 16 for dispersing the light of the blue light emitting diode lamp 15 and irradiating the rice grains is provided between the blue light emitting diode lamp 15 and the first detection recess A.

On the front side of the disk 5 of the first detecting recess A, reflected light and transmission obtained from rice grains irradiated from the red light emitting diode lamp 13, green light emitting diode lamp 14, and blue light emitting diode lamp 15 of the irradiation means. An RGB image sensor 17 that outputs a signal corresponding to each of red, green, and blue light colors is provided. The RGB image sensor 17 has a plurality of elements (pixels) that respond to light of each color of red, green, and blue arranged for each color, and a plane corresponding portion 17a that receives light from a plane portion of a rice grain and a rice grain. And a side surface corresponding portion 17b for receiving light from the side surface portion. Between the RGB image sensor 17 and the first detection concave portion A, a condenser lens (light entering means) 18 described later for causing light from the front side of the rice grain to enter the plane corresponding portion 17a of the RGB image sensor 17 is provided. It is arranged.

Light from the side surface of the rice grains in the first detecting recess A enters the lateral position of the disk 5 at the outer peripheral edge portion 11, and the light from the RGB image sensor 17 passes through the condenser lens 18. Deflection means 19 for causing light to enter the side surface corresponding portion 17b is provided. The diverting means 19 is composed of, for example, a prism or a mirror. In the case of a prism, as shown in FIG. 3, the cross section is a right-angled isosceles triangle, and one side of the isosceles faces the side edge portion 11 and the other side faces the RGB image sensor 17. It is arranged. In the case where the turning means 19 is constituted by a mirror, as shown in FIG. 6, a mirror is provided so as to reflect the light from the side surface of the rice grain to the condenser lens 18.

Both the light obtained from the flat portion of the rice grain in the first detecting recess A and the light from the side portion of the rice grain are converted to the flat surface corresponding portion 17a and the side surface corresponding portion 17a.
b is configured to be detected by one of the RGB image sensors 17. These two lights are made to enter the RGB image sensor 17 via one condensing lens 18. In the present embodiment, the condensing lens (light entering means) 18 is a horizontally long one such as a rod lens array or a cylindrical lens.

Next, the second optical detector 10 will be described with reference to FIG. A space 20 is formed in the disk base 6 below the concave portion 3 at a predetermined position (hereinafter, referred to as “second detecting concave portion B”) in the second optical detecting portion 10. Irradiation means for irradiating the rice grains of the second detection recess B with light are provided on the front side and the back side of the disk 5, respectively.
On the front side of the disk 5, a green light emitting diode lamp 21 for irradiating green light to a position obliquely above the second detection recess B, and a blue light emitting diode lamp 22 for irradiating blue light to a position above the second detection recess B And are arranged respectively. Between the blue light emitting diode lamp 22 and the second detection recess B, a diffusion plate 23 for diffusing the light of the blue light emitting diode lamp 22 and irradiating the rice grains is provided. On the other hand, on the back side of the disk 5, a red light-emitting diode lamp 24 for irradiating red light is disposed at a position obliquely below the second detection recess B.

The back side of the second detecting recess B (disk 5)
A RGB image sensor 26 of the same type as that used in the first optical detection unit 9 is disposed on the
A condensing lens 25 of the same type as that used in the first optical detection unit 9 is disposed between the B image sensor 26 and the second detection concave portion B. Note that the RGB image sensor 26 is not divided like the RGB image sensor 17.

The rice grain quality discriminating apparatus 1 is provided with an elimination means for removing the optically detected rice grains that have passed through the first optical detection section 9 and the second optical detection section 10 from the recess 3. In the present embodiment, an injection unit F that injects high-pressure air is used as the elimination unit.

Next, a quality discriminating means 27 for discriminating the quality of rice grains based on the light receiving signals from the first optical detecting section 9 and the second optical detecting section 10 and a display means 28 for displaying the result of the quality discrimination are shown in FIG. This will be described with reference to the block diagram of FIG. The quality determining means 27 includes a central processing unit 29 (hereinafter, referred to as a CPU). The CPU 29 has a read-only storage unit 30 (hereinafter, referred to as a ROM),
A read / write storage unit 31 (hereinafter, referred to as RAM) and an input / output circuit 32 for inputting and outputting signals are electrically connected. The input / output circuit 32 is connected to the first optical detector 9 and the second optical detector 9 via a converter 33 (hereinafter, referred to as an A / D converter) that converts an analog signal into a digital signal.
The optical detection units 10 are electrically connected to each other, and are also electrically connected to the display unit 28 for displaying the result of quality determination and the injection unit F.

The rice grain quality discriminating apparatus 1 has the first
An elimination means is provided for removing the optically detected rice grains that have passed through the optical detection unit 9 and the second optical detection unit 10 from the recess 3. In the present embodiment, an injection unit F that injects high-pressure air is used as the elimination unit.

Next, the rice grain quality discriminating apparatus 1 according to the present invention.
The operation of will be described. When the irradiating means of the first optical detection unit 9 and the second optical detection unit 10 are constantly turned on and the drive motor 4b is operated, the disk 5 is rotated by the rotating shaft 4a.
Is rotated in the direction of arrow Q in FIG. 2, and the rice grains S stored in the storage unit 7 enter the recess 3 one by one and are transported toward the first optical detection unit 9. In the first optical detection section 9, the first optical detection section 9 defines the concave portion 3 at a predetermined position where optical detection is performed.
The rice grains S in the detection recess A are irradiated with light from the red light emitting diode lamp 13, the green light emitting diode lamp 14, and the blue light emitting diode lamp 15. The light emitted from the flat portion of the rice grain passes through the condensing lens 18 to the flat corresponding portion 17a of the RGB image sensor 17.
And the side of the rice grain (peripheral side of disk 5)
Is transmitted through the outer peripheral edge portion 11 formed of a transparent material, and further, the prism (turning means) 19
The direction is changed to the RGB image sensor 17 by the RGB image sensor 1 via the condenser lens 18.
7 enters the side surface corresponding portion 17b. The plane corresponding portion 17a and the side corresponding portion 17 of the RGB image sensor 17
b outputs a signal to the quality determining means 27 in pixel units corresponding to the incoming red light, green light and blue light, respectively.

The quality determining means 27 converts the analog signals sent from the plane corresponding portion 17a and the side surface corresponding portion 17b of the RGB image sensor 17 into an A / D converter 33.
Is converted into a digital signal by the input / output circuit 32.
Is taken into the CPU 29 via the. The CPU 29
First, a plane image (shape) of a rice grain is constructed based on the pixel signal (information) of blue light from the plane corresponding portion 17a,
Next, based on the respective pixel signals (information) of the red light, green light and blue light from the plane corresponding portion 17a corresponding to the rice grain image, color information as “front side information” of the rice grain,
Obtain partial coloring information and transparency information. Next, a side image of the rice grain is constructed based on the pixel signal of any one color sent from the side corresponding portion 17b, and the “grain” of the rice grain is determined based on the number of pixels corresponding to the side image. Thickness information ". The “front side information” and the “grain thickness information” are temporarily stored in the RAM 31 until the “back side information” of the rice grain is obtained by the second optical detection unit 10.

The rice grains having passed through the first optical detecting section 9 are transferred to the second optical detecting section 10. The second optical detection unit 10
In the above, light from the red light emitting diode lamp 24, the green light emitting diode lamp 21, and the blue light emitting diode lamp 22 is irradiated on the rice grains S in the second detecting concave portion B, which is the concave portion 3 at a predetermined position for performing optical detection. You. The light emitted from the back side of the rice grain (the back side of the disk 5) passes through the condenser lens 25 to the RGB image sensor 26.
Light enters. The RGB image sensor 26 outputs a signal to the quality judging means 27 in a pixel unit corresponding to each of the incoming red light, green light and blue light.

The quality judging means 27 converts the sent pixel signal from analog to digital by an A / D converter 33, and takes it into a CPU 29 via an input / output circuit 32. The CPU 29 constructs a plane image (shape) of the back side of the rice grain based on the pixel signal (information) of the blue light from the RGB image sensor 26, and then red light and green light from the RGB image sensor 26 corresponding to the rice grain image. Based on each pixel signal (information) of light and blue light, partial coloring information and body split information as “backside information” of rice grains are obtained. Thereafter, the CPU 29 compares the “back side information” with the values for each quality preset in the ROM 30 based on the “front side information” and the “grain thickness information” temporarily stored in the RAM 31. To comprehensively determine the quality of rice grains. Then, in order to finally total the number of rice grains for each discrimination quality, the CPU 29 compares the judgment result with the RA.
It is stored in M31. As described above, the optical detection by the first optical detection unit 9 and the second optical detection unit 10 and the quality determination by the quality determination means 27 are performed for each rice grain, and when the determination of all the rice grains is completed, the number of rice grains for each quality is determined. And the like, and screen display and / or printout as the display means 28 is performed.

The rice grains in each of the recesses 3 having passed through the first optical detecting section 9 and the second optical detecting section 10 are separated by the blowing means F
Is removed from the concave portion 3 by the operation of.

According to the present invention, the prism 1 as a turning means is used.
By configuring No. 9, the light from the side of the rice grain can be incident on the same RGB image sensor together with the light obtained from the flat part of the rice grain. Since the calculation is accurate based on the number of pixels on which the image construction is based, it is possible to determine the quality of rice grains with high accuracy. Further, according to the present invention, as described in the above embodiment, "backside information" of the rice grain can be obtained by using another RGB image sensor for the second optical detection unit 10, and the quality of the rice grain can be obtained. The discrimination accuracy can be further improved.

A modification of the first optical detector 9 will be described with reference to FIG. This modification is based on the RGB
The image sensor 17 is provided upright at a position on the side of the peripheral edge of the disk 5. At a position above the surface of the disk 5 in the first detection recess A, light turning from a flat portion of the rice grain in the first detection recess A is incident and the light is emitted to the RGB image sensor 17. Is provided.
The turning means 34 uses a prism or a mirror as described above, and FIG. 7 shows an example using a prism. The same condensing lens 1 as in the previous embodiment is provided between the prism (the turning means 34) and the RGB image sensor 17 and between the outer peripheral edge 11 of the disk 5 and the RGB image sensor 17.
8 and the light from the prism is directed to the plane corresponding portion 17a of the RGB image sensor 17, and the light from the side surface of the rice grain is directed to the side corresponding portion 17b of the RGB image sensor 17.
The light is made to enter each.

The first optical detector 9 configured as described above is
The light obtained from the flat portion of the rice grain is taken into the flat corresponding portion 17a via the prism (turning means 34) and the condensing lens 18, and the light obtained from the side portion of the rice grain is collected by the condensing lens 18. The signal is taken into the side surface corresponding portion 17b through the interface, and signals are output from the plane corresponding portion 17a and the side surface corresponding portion 17b to the quality determining means 27, respectively. Then, as described in the above embodiment, the quality determining means 27 obtains “front side information” of the rice grain based on the signal from the plane corresponding portion 17a, and obtains the rice grain based on the signal from the side corresponding portion 17b. Get “grain thickness information”. Thus, the first
According to the modified example of the optical detection unit 9, light from the flat part and the side part of the rice grain can be acquired by one RGB image sensor.

[0035]

According to the present invention, the light receiving means is disposed at a position facing either one of the flat part and the side part of the rice grain at a predetermined position transferred by the transfer means, and is provided near the other surface part. A diverting means for directing the light obtained from the rice grain to the light receiving means is provided, and between the rice grain and the diverting means and the light receiving means, from one surface portion of the rice grain facing the light receiving means. The light from the side surface and the flat portion of the rice grain is incident on the same light receiving means by arranging the light entering means for entering the light and the light from the turning means into the light receiving means. Based on the signal from the light receiving means, the "front side information" and "grain thickness information" of the rice grain can be obtained to determine the quality of the rice grain. Therefore, according to the present invention, the number of light receiving means can be reduced as compared with the related art, so that the number of places where the position of the light receiving means is adjusted can be reduced, and the apparatus can be made compact. In addition, since the “grain thickness information” is calculated based on the number of pixels on which the image of the rice grain is constructed, it is accurate, and therefore, the quality of the rice grain can be determined with high accuracy. .

[Brief description of the drawings]

FIG. 1 is a side sectional view of a rice grain quality determination device 1 of the present invention.

FIG. 2 is a plan view of a disk provided in the rice grain quality determination device.

FIG. 3 is a side sectional view of the first optical detection unit 9;

FIG. 4 is a side sectional view of the second optical detection unit 10.

FIG. 5 is a block diagram of a quality determination means provided in the rice quality determination device for determining the quality of rice grains.

FIG. 6 is a side sectional view showing a modification of the first optical detection unit 9;

FIG. 7 is a side sectional view showing a modification of the first optical detection unit 9.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rice grain quality discriminating device 2 transfer means 3 concave portion 3a bottom surface 4a rotating shaft 4b drive motor 5 disk 6 disk base 7 storage unit 8 base 9 first optical detection unit 10 second optical detection unit 11 outer peripheral edge 12 space 13 red Light-emitting diode lamp 14 Green light-emitting diode lamp 15 Blue light-emitting diode lamp 16 Diffusion plate 17 RGB image sensor 17a Plane corresponding portion 17b Side-corresponding portion 18 Condensing lens (light incident means) 19 Turning means 20 Space portion 21 Green light-emitting diode lamp 22 Blue light emitting diode lamp 23 Diffusion plate 24 Red light emitting diode lamp 25 Condensing lens 26 RGB image sensor 27 Quality discriminating means 28 Display means 29 Central processing unit (CPU) 30 Read only storage unit (ROM) 31 Read / write storage unit (RAM) 32 Input / output circuit 33 A / D converter 34 Turning means A First detection concave part B Second detection concave part F Injection means S Rice grain

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoichi Kawamura 2-30 Saijo Nishihonmachi, Higashihiroshima City, Hiroshima Prefecture Inside Satake Works Co., Ltd. (72) Inventor Eku Nakada 2:30 Saijo Nishihonmachi, Higashihiroshima City, Hiroshima Prefecture F-term (reference) in Satake Corporation 2F065 AA23 AA30 BB05 CC00 FF41 GG07 GG21 HH14 JJ03 JJ26 LL12 LL46 LL49 MM02 QQ03 QQ23 RR06 TT03 2G051 AA04 BA01 BA08 CA07 CB01 CB02 CC20 DA01 DA08

Claims (2)

[Claims] 1. A transferring means for transferring rice grains one by one, an irradiating means for irradiating a plurality of monochromatic lights on rice grains at predetermined positions transferred by the transferring means, and a rice grain receiving irradiation light from the irradiating means. Receiving means for receiving a plurality of monochromatic lights from a plurality of pixels and outputting a signal corresponding to each monochromatic light; and quality determining means for determining rice grains to a plurality of qualities based on signals from each pixel of the light receiving means. In the rice grain quality determination device comprising: the light receiving means is disposed at a position facing one of the plane portion or the side surface portion of the rice grain at the predetermined position, and in the vicinity of the other surface portion Is disposed a turning means for directing the light obtained from the rice grains to the light receiving means,
Between the rice grain and the turning means and the light receiving means, a light inputting means for inputting light from one surface portion of the rice grain facing the light receiving means and light from the turning means to the light receiving means. A rice grain quality discriminating device, which is provided. 2. The rice grain quality discriminating apparatus according to claim 1, wherein said diverting means comprises a prism or a mirror.