JPS61110016A - Photoelectric detector for color selector - Google Patents

Photoelectric detector for color selector

Info

Publication number
JPS61110016A
JPS61110016A JP23180084A JP23180084A JPS61110016A JP S61110016 A JPS61110016 A JP S61110016A JP 23180084 A JP23180084 A JP 23180084A JP 23180084 A JP23180084 A JP 23180084A JP S61110016 A JPS61110016 A JP S61110016A
Authority
JP
Japan
Prior art keywords
light
photoelectric
particles
detection device
wavelength components
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23180084A
Other languages
Japanese (ja)
Inventor
Toshihiko Satake
佐竹 利彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Satake Engineering Co Ltd
Original Assignee
Satake Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Satake Engineering Co Ltd filed Critical Satake Engineering Co Ltd
Priority to JP23180084A priority Critical patent/JPS61110016A/en
Publication of JPS61110016A publication Critical patent/JPS61110016A/en
Pending legal-status Critical Current

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  • Spectrometry And Color Measurement (AREA)
  • Sorting Of Articles (AREA)

Abstract

PURPOSE:To achieve a simplified construction and a higher detection accuracy, by providing a dichroic mirror of a construction peculiar to the optical path in a photoelectric detector. CONSTITUTION:Particles mixed with those of different colors as material dropping to a vibrating grain feed gutter 8 from a feed hopper 6 run down with a vibrator 7 through a down gutter 2 in a photoelectric selection chamber 3. In the selection chamber 3, a beam emitted from a light source 9 provided on a photoelectric selector 12 irradiate grain particles running down along a downflow locus A separately and the transmission light is made incident into a dichroic mirror 19 through a condenser 20. This mirror 19 reflects short wavelength components from the surface thereof 19 below about 550nm as boundary while transmits long wavelength components through the surface thereof 19 thereabove. The reflected light as the short wavelength component is received with a light receiving element 10A while the transmission light as long wavelength component done with a light receiving element 10B and the light reception signals thereof are inputted into a control circuit 16 to be compared with respective preset references. An jet nozzle unit 13 is operated by the light reception signal exceeding the set reference to separate particles of different colors.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は異色粒混入粒子を色彩選別する色彩選別機の光
電検出装置の改良に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement of a photoelectric detection device for a color sorter that color sorts particles mixed with different colors.

従来技術とその問題点 従来、穀粒等の色彩選別機の光電検出装置は、広帯域の
波長を有する白色光を被写体に照射し、その反射または
透過光線を単一の色フィルターを透してこれに応じた特
定波長の光線を受光していたので、複数個の特定波長を
検出する場合は、複数個の色フィルターとこれに対応す
る複数個の受光素子を設ける必要があり、ために狭隘な
光電室内を複雑化して点検・修理等を不便にすると共に
、各受光素子は受光する光線の射入角が変化してその受
光量を減衰する等の欠点を有し、またハーフミラを設け
た装置では、各受光素子の受光量が半減して検出精度を
大幅に低下する等の問題点を有し、これら装置の改善が
夙に要望される処であった。
Conventional technology and its problems Conventionally, the photoelectric detection device of a color sorter for grains, etc., irradiates a subject with white light having a wide range of wavelengths, and passes the reflected or transmitted light through a single color filter. Since the light rays of specific wavelengths were received according to In addition to complicating the interior of the photoelectric chamber and making inspection and repair inconvenient, each light receiving element has drawbacks such as the angle of incidence of the received light rays changing and the amount of light received is attenuated. However, the amount of light received by each light-receiving element is halved, resulting in a significant decrease in detection accuracy.Therefore, improvements to these devices have long been desired.

発明の目的 本発明は上記の諸点に鑑み、光電検出装置内の光路に特
有構造のダイロイツクミラを設けることにより、被写体
からの光線を短波長成分と長波長成分に区分してそれぞ
れの波長成分を反射および透過させて効率的にそれぞれ
受光するようにし、以て、前述した従来装置の欠点を完
全に排除すると共に、複数個の特定波長を高精度に検出
して色彩による選別機能を大幅に向上し、しかも、簡潔
な構造により異色粒の混入しない良質精選穀粒を確実に
示度する高性能な色彩選別薇の光電検出装置を提供する
ことを目的とする。
Purpose of the Invention In view of the above-mentioned points, the present invention divides the light rays from the subject into short wavelength components and long wavelength components and reflects each wavelength component by providing a diloic mirror with a unique structure in the optical path in the photoelectric detection device. By transmitting and receiving light efficiently, the drawbacks of the conventional device described above are completely eliminated, and multiple specific wavelengths can be detected with high precision, greatly improving the ability to sort by color. Moreover, it is an object of the present invention to provide a high-performance photoelectric detection device for color sorting roses that has a simple structure and can reliably indicate high-quality carefully selected grains without contamination with different-color grains.

発明の構成 本発明の色彩選別機の光電検出装置は、異色粒混入粒子
を流下樋から流下し、その流下軌跡の周囲に、光源と受
光素子および基準色板から成る光電検出装置と該検出装
置の信号によって作動する噴射ノズル装置を設けて色彩
選別する装置において、受光する光線を短波長成分と長
波長成分に区分してそれぞれの波長成分を反射および透
過するダイクロイックミラを前記光電検出装置内に設け
、前記流下軌跡上の異色粒混入粒子を前記光源から照射
してその反射または透過する光線を前記ダイク0イツク
ミラを介して複数個の受光素子によって受光して選別す
る構成を有する。
Structure of the Invention The photoelectric detection device of the color sorter of the present invention allows particles mixed with different colors to flow down from a downflow gutter, and around the trajectory of the flow, a photoelectric detection device consisting of a light source, a light receiving element, and a reference color plate, and the detection device In the device for color sorting by providing an injection nozzle device activated by a signal, a dichroic mirror that divides the received light beam into a short wavelength component and a long wavelength component and reflects and transmits each wavelength component is installed in the photoelectric detection device. The light source irradiates the different color mixed particles on the falling trajectory from the light source, and the reflected or transmitted light is received by a plurality of light receiving elements via the dike mirror and is selected.

実施例の説明 本発明の構成について第1図〜第2図に基づき説明する
DESCRIPTION OF EMBODIMENTS The structure of the present invention will be explained based on FIGS. 1 and 2.

第1図において、符号1は流下樋2を嵌挿した保温用機
部で、該R筒1の下半部に光電選別室3を、また機部1
の上端部に給穀装置4をそれぞれ連結して一体的に選別
用機体に形成し、給穀装置4では、箱枠5内の上半部を
供給ホッパー6に形設してその下部に振動装置7を備え
た振動送穀樋8を設置し、また光電選別室3には、流下
樋2から流出する穀粒粒末の流下軌跡Aの周囲に、光源
9.受光素子10.基準色板11から成る光電検出装置
12を設けると共に、その下部の前記機部1内部に噴射
ノズル装置13を関連的に配置し、また、前記流下軌跡
Aの延長線上に集穀筒14を固設すると共に、前記機部
1の下端に異色粒排出口15を開設し、前記機部1側部
に制御回路16を内蔵した灘枠17を固着すると共に、
該機枠17下部に支柱18を設けて一体的に色彩選別機
に形成しである。
In FIG. 1, reference numeral 1 denotes a heat-retaining machine part into which a downstream gutter 2 is inserted, a photoelectric sorting chamber 3 is installed in the lower half of the R cylinder 1, and a machine part 1
A grain feeding device 4 is connected to the upper end of the grain feeding device 4 to integrally form a sorting machine. A vibrating grain feeding trough 8 equipped with a device 7 is installed, and a light source 9. Light receiving element 10. A photoelectric detection device 12 consisting of a reference color plate 11 is provided, and an injection nozzle device 13 is arranged in relation to the inside of the machine section 1 below the photoelectric detection device 12, and a grain collecting barrel 14 is fixed on an extension line of the flow trajectory A. At the same time, a unique grain discharge port 15 is opened at the lower end of the machine section 1, and a Nada frame 17 with a built-in control circuit 16 is fixed to the side of the machine section 1.
A support 18 is provided at the bottom of the machine frame 17 to integrally form a color sorting machine.

そして、前記光電検出装置12には、(第2図参照)受
光する光線を短波長成分と長波長成分に区分してそれぞ
れ反射または透過させるダイクロイックミラ19を集光
レンズ20の後方位置に配置し、前記各光源9・・・か
ら流下軌跡A上の異色粒混入粒子を照射してその透過光
線(または反射光線)を前記ダイクロイックミラ19を
介して複数個の受光素子10A、IOBによってそれぞ
れ受光するように形成し、21は青色フィルター、22
は赤色フィルターである。
In the photoelectric detection device 12 (see FIG. 2), a dichroic mirror 19 is arranged behind the condenser lens 20 to divide the received light into short wavelength components and long wavelength components and reflect or transmit them. , the particles mixed with different color particles on the falling trajectory A are irradiated from each of the light sources 9 . 21 is a blue filter, 22 is formed as follows.
is a red filter.

以上の構成について以下その作用を説明する。The operation of the above configuration will be explained below.

供給ホッパー6から振動送穀樋8に流下する、原料の異
色粒混入粒子(例えば玄米とする)は振動装置7の振動
作用によって下部の流下樋2に流下し、混入粒子は樋面
を清流して光電選別室3内を流下軌跡Aに沿って流下す
る。光電選別室3内では、(第2図参照)光電選別装置
12に設けた光源9・・・から発する光線が流下軌跡A
を流下する穀粒(被射体)をそれぞれ照射し、その透過
光線(または反射光線)は集光レンズ2oを介してダイ
クロイックミラ19に射入される。このダイクロイック
ミラ19は、受光する光線を短波長成分と長波長成分に
区分してそれぞれの波長成分を反射および透過するとい
う波長特性を有しており、前記ダイクロイックミラ19
は第3図に示すように波長55Qnmを境界線としてそ
れ以下の短波長成分はミラ19面から反射し、またそれ
以上の長波長成分はミラ19面を透過すると共に、短波
長成分の反射光は青色フィルター21を通過し、(第4
図参照)その波長選択性により波長400〜500nm
区域の光II(相対強度100%)を受光素子10Aに
、また、長波長成分の透過光は赤色フィルター22を通
過し、その波長選択性により、波長600〜700nm
区域の光線(相対強度100%)を受光素子10Bによ
ってそれぞれ減衰することなく受光されると共に、その
各受光信号は制御回路16に入力されて予め定めた各設
定基準値と比較され、前記設定基準値を超える受光信号
によつで噴射ノズル装置13をそれぞれ作動し、その噴
風ノズルの噴風作用によって前記混合粒子く玄米)から
異色粒子を飛散し分離して選別することになる。従来装
置では、単一の受光素子によって透過光(または反射光
)を受光して選別したので、青味を帯びた整粒は前記設
定基準値を超えて選別されていたが、本装置では前述し
たように複数個の受光素子を設けて2種の特定波長く4
00〜500nII1区域、  600〜700rv区
域)の光線を検出するので、前記受光素子10Aの受光
信号を前記制御回路16に入力し、その信号により前記
受光素子10Bの検出信号を消去して噴射ノズル装置1
3の作動を阻止できるので、前記混合粒子中に青味を帯
びた整粒を残して着色粒を飛散して分離し、分離された
異色粒子は異色粒排出口15から機外に排除されると共
に、基準色粒子は集穀筒14を介して機外に取出される
ことになる。
The mixed particles of raw material (for example, brown rice) flowing down from the supply hopper 6 to the vibrating grain feed gutter 8 flow down to the lower flow gutter 2 by the vibration action of the vibrating device 7, and the mixed particles are washed away from the gutter surface. and flows down inside the photoelectric sorting chamber 3 along a flow trajectory A. In the photoelectric sorting chamber 3 (see Fig. 2), the light beams emitted from the light sources 9 provided in the photoelectric sorting device 12 follow a falling trajectory A.
The transmitted light beams (or reflected light beams) are incident on the dichroic mirror 19 via the condenser lens 2o. This dichroic mirror 19 has a wavelength characteristic of dividing the received light into a short wavelength component and a long wavelength component and reflecting and transmitting each wavelength component.
As shown in Figure 3, with the wavelength 55Qnm as the boundary line, shorter wavelength components are reflected from the mirror 19 surface, longer wavelength components are transmitted through the mirror 19 surface, and the reflected light of the shorter wavelength components is passes through the blue filter 21, and the (fourth
(See figure) Due to its wavelength selectivity, the wavelength is 400 to 500 nm.
The light II (relative intensity 100%) of the area is sent to the light receiving element 10A, and the transmitted light of the long wavelength component passes through the red filter 22, and due to its wavelength selectivity, the wavelength is 600 to 700 nm.
The light rays (relative intensity 100%) in the area are each received without attenuation by the light receiving element 10B, and each received light signal is input to the control circuit 16 and compared with each predetermined reference value, and the said setting reference value is The jet nozzle devices 13 are actuated by the received light signal exceeding the value, and the jet action of the jet nozzles scatters, separates and sorts out the different colored particles from the mixed particles (brown rice). In conventional devices, a single light-receiving element receives transmitted light (or reflected light) and selects it, so that the particles with a bluish tinge exceed the set standard value. As shown above, multiple light-receiving elements are installed to detect two types of specific wavelengths with a length of 4.
00 to 500nII1 area, 600 to 700rv area), the light reception signal of the light receiving element 10A is input to the control circuit 16, and the signal erases the detection signal of the light receiving element 10B, and the injection nozzle device 1
3 can be prevented, the colored grains are scattered and separated while leaving bluish regular grains in the mixed grains, and the separated different colored grains are discharged outside the machine from the different colored grain outlet 15. At the same time, the reference color particles are taken out of the machine via the grain collecting cylinder 14.

なお、前記ダイクロイックミラは、その蒸着被膜材の分
子の大小変化により、第3図で説明した境界線の波長を
任意に変更調整でき、また短波長成分を透過し、また長
波長成分を反射するように形成することもできる。また
複数のダイクロイックミラを並列して使用する場合もあ
り、またダイクロイックミラによる選別方法は、例示し
た玄米選別の以外に各特定波長を利用して2種類の異色
粒子を選別する場合もあり、またこの選別方法は米・麦
などの穀粒、豆類などの色彩選別に好適である。
In addition, the dichroic mirror can arbitrarily change and adjust the wavelength of the boundary line explained in FIG. 3 by changing the size of the molecules of the vapor-deposited coating material, and also transmits short wavelength components and reflects long wavelength components. It can also be formed like this. In addition, multiple dichroic mirrors may be used in parallel, and the sorting method using dichroic mirrors, in addition to the exemplified brown rice sorting, may also use each specific wavelength to separate two types of uniquely colored particles. This sorting method is suitable for color sorting grains such as rice and wheat, beans, and the like.

発明の詳細 な説明したように本発明によれば、光電検出装置内の光
路に特有構造のダイクロイックミラを設けることにより
、被射体からの光線を、短波長成分と長波長成分に区分
してそれぞれの波長成分を反射および透過させて効率的
に受光するようにし、以て、前述した従来装置の欠点を
完全に排除できると共に、複数個の特定波長を高精度に
検出して色彩による選別機能を大幅に向上でき、しかも
、構造は極めて簡潔で製作・組立を簡易にし、異色粒の
混入しない良質の精選穀粒を確実に■産できる等の効果
を有する。
DETAILED DESCRIPTION OF THE INVENTION According to the present invention, by providing a dichroic mirror with a unique structure in the optical path within the photoelectric detection device, the light rays from the object are divided into short wavelength components and long wavelength components. By reflecting and transmitting each wavelength component to efficiently receive light, it is possible to completely eliminate the drawbacks of the conventional device described above, and it also has the ability to detect multiple specific wavelengths with high precision and sort by color. In addition, the structure is extremely simple, making production and assembly easy, and it has the effect of reliably producing selected grains of high quality that are free from foreign-colored grains.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は色彩選別機の側断面図、第2図は光電検出装置
内の配置図、第3図はダイクロイックミラの波長特性を
示すグラフ、第3図はフィルター通過後の光の波長特性
を示すグラフである。 1・・・保温用橋部    2・・・流下樋3・・・光
電選別至    4・・・給穀装置5・・・箱枠   
    6・・・供給ホッパー7・・・振動装置   
  8・・・振動送穀樋9・・・光源  10.IOA
、10B・・・受光素子11・・・基準色板    1
2・・・光電選別装置13・・・複写ノズル装置 14
・・・集糠筒15・・・異色粒排出口  16・・・制
御回路17・・・機枠      18・・・支柱19
・・・ダイクロイックミラ  20・・・集顯レンズ2
1・・・青色フィルター 22・・・赤色フィルターA
・・・流下軌跡 特許出願人 株式会社′佐竹製作所 第1図 2二流下樋 3 :光電選別室 第3図 岐 長 (nm) 第4図 1!  j!  (nm) 手続ネ甫正書 く方式) %式% 1、事件の表示 昭和59年特許願第231800号 2、発明の名称  色彩選別機の光電検出装置3、補正
をする者 事件との関係 特許出願人 住所 東京都台東区上野1丁目19番10号名称 (1
81)株式会社 佐 竹 製 作 所昭和60年 2月
 6日 (昭和60年 2月26日 発送) 5、補正の対象 4、図面の簡単な説明 第1図は色彩選別機の側断面図、第2図は光電検出装置
内の配置図、第3図はダイクロイックミラの波長特性を
示すグラフ、第4図はフィルター通過後の光の波長特性
を示すグラフである。 1・・・保温用橋部    2・・・流下樋3・・・光
電選別室    4・・・給穀装置5・・・箱枠   
    6・・・供給ホッパー7・・・振動装置   
  8・・・振動送穀樋9・・・光源  10.10A
、10B・・・受光素子11・・・基準色板    1
2・・・光電選別装置13・・・複写ノズル装置 14
・・・集糠筒15・・・異色粒排出口  16・・・制
御回路17・・・機枠      18・・・支柱′1
9・・・ダイクロイックミラ  20・・・集糠レンズ
21・・・青色フィルター 22・・・赤色フィルター
A・・・流下軌跡
Figure 1 is a side sectional view of the color sorter, Figure 2 is the layout inside the photoelectric detection device, Figure 3 is a graph showing the wavelength characteristics of the dichroic mirror, and Figure 3 is the wavelength characteristics of the light after passing through the filter. This is a graph showing. 1... Bridge section for heat retention 2... Downflow gutter 3... Photoelectric sorting 4... Grain feeding device 5... Box frame
6... Supply hopper 7... Vibration device
8... Vibrating grain feeder 9... Light source 10. IOA
, 10B... Light receiving element 11... Reference color plate 1
2...Photoelectric sorting device 13...Copying nozzle device 14
...Blank collector tube 15...Unusual grain discharge port 16...Control circuit 17...Machine frame 18...Strut 19
...Dichroic Mira 20...Collection lens 2
1...Blue filter 22...Red filter A
...Downflow path Patent applicant: Satake Seisakusho Co., Ltd. Figure 1 2 Second flow downpipe 3: Photoelectric sorting room Figure 3 Width length (nm) Figure 4 1! j! (nm) Procedure name (original format) % formula % 1. Indication of the case Patent Application No. 231800 of 1982 2. Title of the invention Photoelectric detection device for color sorting machine 3. Person making the amendment Relationship with the case Patent Applicant Address: 1-19-10 Ueno, Taito-ku, Tokyo Name (1)
81) Manufactured by Satake Co., Ltd. February 6, 1985 (shipped February 26, 1985) 5. Subject of correction 4. Brief explanation of drawings Figure 1 is a side sectional view of the color sorting machine. FIG. 2 is a layout diagram inside the photoelectric detection device, FIG. 3 is a graph showing the wavelength characteristics of a dichroic mirror, and FIG. 4 is a graph showing the wavelength characteristics of light after passing through a filter. 1... Heat retention bridge section 2... Downflow gutter 3... Photoelectric sorting room 4... Grain feeding device 5... Box frame
6... Supply hopper 7... Vibration device
8... Vibrating grain feeder 9... Light source 10.10A
, 10B... Light receiving element 11... Reference color plate 1
2...Photoelectric sorting device 13...Copying nozzle device 14
...Branch collector tube 15...Unusual grain discharge port 16...Control circuit 17...Machine frame 18...Strut '1
9... Dichroic mirror 20... Rice bran collecting lens 21... Blue filter 22... Red filter A... Downward trajectory

Claims (1)

【特許請求の範囲】[Claims] 異色粒混入粒子を流下樋から流下し、その流下軌跡の周
囲に、光源と受光素子および基準色板から成る光電検出
装置と該検出装置の信号によつて作動する噴射ノズル装
置を設けて色彩選別する装置において、受光する光線を
短波長成分と長波長成分に区分してそれぞれの波長成分
を反射および透過するダイクロイックミラを前記光電検
出装置内に設け、前記流下軌跡上の異色粒混入粒子を前
記光源から照射してその反射または透過する光線を前記
ダイクロイックミラを介して複数個の受光素子によつて
受光して選別することを特徴とした色彩選別機の光電検
出装置。
Particles mixed with different colors are allowed to flow down from a downflow gutter, and a photoelectric detection device consisting of a light source, a light-receiving element, and a reference color plate, and an injection nozzle device activated by the signal of the detection device are installed around the trajectory of the flow to perform color sorting. In the device, a dichroic mirror that divides the received light into short wavelength components and long wavelength components and reflects and transmits the respective wavelength components is provided in the photoelectric detection device, and the particles mixed with different color particles on the falling trajectory are A photoelectric detection device for a color sorter, characterized in that light rays emitted from a light source and reflected or transmitted are received by a plurality of light receiving elements via the dichroic mirror and are sorted.
JP23180084A 1984-11-02 1984-11-02 Photoelectric detector for color selector Pending JPS61110016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23180084A JPS61110016A (en) 1984-11-02 1984-11-02 Photoelectric detector for color selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23180084A JPS61110016A (en) 1984-11-02 1984-11-02 Photoelectric detector for color selector

Publications (1)

Publication Number Publication Date
JPS61110016A true JPS61110016A (en) 1986-05-28

Family

ID=16929218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23180084A Pending JPS61110016A (en) 1984-11-02 1984-11-02 Photoelectric detector for color selector

Country Status (1)

Country Link
JP (1) JPS61110016A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0378634A (en) * 1989-08-23 1991-04-03 Yamamasu Seisakusho:Kk Color sorter using color-separating prism
US5135114A (en) * 1988-08-11 1992-08-04 Satake Engineering Co., Ltd. Apparatus for evaluating the grade of rice grains
US5158181A (en) * 1985-10-29 1992-10-27 Bailey Roger F Optical sorter
US6075217A (en) * 1995-01-24 2000-06-13 Chipper 2000 Limited Color detection apparatus
US20130098807A1 (en) * 2010-04-28 2013-04-25 Grant Ashley Wellwood Sorting mined material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51145384A (en) * 1975-06-10 1976-12-14 Toshiba Corp Color tone detector
JPS59168327A (en) * 1983-03-14 1984-09-22 Satake Eng Co Ltd photoelectric detecting device for color selecting machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51145384A (en) * 1975-06-10 1976-12-14 Toshiba Corp Color tone detector
JPS59168327A (en) * 1983-03-14 1984-09-22 Satake Eng Co Ltd photoelectric detecting device for color selecting machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158181A (en) * 1985-10-29 1992-10-27 Bailey Roger F Optical sorter
US5135114A (en) * 1988-08-11 1992-08-04 Satake Engineering Co., Ltd. Apparatus for evaluating the grade of rice grains
JPH0378634A (en) * 1989-08-23 1991-04-03 Yamamasu Seisakusho:Kk Color sorter using color-separating prism
US6075217A (en) * 1995-01-24 2000-06-13 Chipper 2000 Limited Color detection apparatus
US20130098807A1 (en) * 2010-04-28 2013-04-25 Grant Ashley Wellwood Sorting mined material
US8957340B2 (en) * 2010-04-28 2015-02-17 Technological Resources Pty Ltd Sorting mined material
AU2011245066B2 (en) * 2010-04-28 2015-11-05 Technological Resources Pty. Limited Sorting mined material

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