TW201905413A

TW201905413A - Optical system for measurement, color luminance meter and color meter

Info

Publication number: TW201905413A
Application number: TW107115173A
Authority: TW
Inventors: 長澤仁
Original assignee: 日商柯尼卡美能達股份有限公司
Priority date: 2017-06-15
Filing date: 2018-05-04
Publication date: 2019-02-01
Also published as: KR20200006112A; KR102321175B1; JPWO2018230177A1; JP7200936B2; WO2018230177A1; CN110741300A; TWI683090B

Abstract

These optical system for measurement, color luminance meter and colorimeter are provided with: a stop; a light waveguide that guides incident light; a first optical system that is disposed on the object side of the stop, and forms a light image from an object to be measured on an aperture plane of the stop; and a second optical system that is disposed between the stop and the light waveguide, and causes respective principal rays of light fluxes emitted from the aperture plane of the stop to be incident on the light waveguide such that the principal rays become parallel to a light axis.

Description

Optical system for measurement, color luminance meter and color meter

本發明係有關於將來自被測定物的光導光至受光部的測定用光學系統、使用其的色彩輝度計、及使用其的色彩計。The present invention relates to a measurement optical system that guides light from a measurement object to a light receiving unit, a color luminance meter using the same, and a color meter using the same.

從前已知有測定作為被測定物的發光體中的顏色(光源色)及輝度的色彩輝度計、或測定作為被測定物的物體中的顏色(物體色)的色彩計，並作為各種利用。這種色彩輝度計或色彩計，使用將來自被測定物的光導光至受光部的測定用光學系統，例如，由專利文獻1所揭示。　　在該專利文獻1中揭示的測定用的光學裝置具備光分歧機構，該光分歧機構具有將來自入射至入射面的被測定物的光分歧並出射的複數出射面。更具體來說，專利文獻1中揭示的測定用的光學裝置具備：由對物透鏡103、開口光圈104、視野光圈105、中繼透鏡106及纖維束陣列22等所構成的光學系統KK2(圖9及段落[0042]等)。對物透鏡103使來自被測定物Q的光束集光至視野光圈105的位置並成像。中繼透鏡106將成像於視角光圈105的位置的像導至纖維束陣列22的入射面A。開口光圈104配置於對物透鏡103的後方，僅使通過開口光圈104的光束朝向中繼透鏡106。纖維束陣列22相當於前述光分歧機構，將複數光纖母線成束而構成，在軸方向的中間部分分成3個，入射至入射面A的光束分3個出射面B1、B2、B3而出射。中繼透鏡106配置於開口光圈104和入射面A成為光學共軛關係的位置。此外，參照符號在該段落為前述專利文獻1中用於各構成的符號。　　此外，近年來，顯示裝置不只是液晶顯示器，有機EL(electro luminescence)顯示器也受到注目。該有機EL顯示器相較於利用背光的液晶顯示器，因為是自發光故在低輝度域也能夠發光。為了能夠也在高精度地測定該低輝度域的發光的顏色，因此，希望有能將更多的光量從被測定物導光至受光部的測定用光學系統。　　在前述專利文獻1中揭示的測定用的光學裝置中，具有纖維束陣列(光纖母線)的開口數相當的角度以上的入射角的光束並無法入射至纖維束陣列(光纖母線)，而產生光量消耗。 [先前技術文獻] [專利文獻] 　　[專利文獻1]特開2003-247891號公報Colorimeters that measure color (light source color) and brightness in a luminous body as a measurement object or colorimeters that measure color (object color) in an object as a measurement object are known in the past and are used for various purposes. Such a colorimeter or colorimeter uses an optical system for measurement that guides light from a measurement object to a light-receiving portion, and is disclosed, for example, in Patent Document 1. (2) The optical device for measurement disclosed in Patent Document 1 includes a light divergence mechanism having a plurality of exit surfaces that diverge and emit light from the object to be measured incident on the incident surface. More specifically, the optical device for measurement disclosed in Patent Document 1 includes an optical system KK2 including an objective lens 103, an aperture stop 104, a field-of-view aperture 105, a relay lens 106, and a fiber bundle array 22 (FIG. 9 and paragraph [0042], etc.). The objective lens 103 focuses the light beam from the object Q to the position of the field diaphragm 105 and forms an image. The relay lens 106 guides an image formed at the position of the viewing aperture 105 to the incident surface A of the fiber bundle array 22. The aperture stop 104 is arranged behind the objective lens 103, and only the light beam passing through the aperture stop 104 is directed toward the relay lens 106. The fiber bundle array 22 is equivalent to the optical branching mechanism described above, and is configured by bundling a plurality of optical fiber bus bars, divided into three in the middle portion in the axial direction, and a light beam incident on the incident surface A is divided into three exit surfaces B1, B2, and B3 and emitted. The relay lens 106 is disposed at a position where the aperture stop 104 and the incident surface A are in an optical conjugate relationship. In addition, the reference symbol in this paragraph is a symbol used for each component in the aforementioned Patent Document 1. In addition, in recent years, display devices are not only liquid crystal displays but also organic EL (electro luminescence) displays. Compared with a liquid crystal display using a backlight, this organic EL display can emit light in a low luminance region because it is self-emitting. In order to be able to measure the color of light emitted in this low-luminance region with high accuracy, a measurement optical system capable of guiding a larger amount of light from the object to be measured to the light receiving unit is desired. In the optical device for measurement disclosed in the aforementioned Patent Document 1, a light beam having an incident angle of an angle equal to or greater than the number of openings of the fiber bundle array (optical fiber bus) cannot enter the fiber bundle array (optical fiber bus), and the amount of light is generated. Consume. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-247891

本發明係鑑於上述情事而完成的發明，其目的為提供能夠將更多的光量從被測定物導光至受光部的測定用光學系統、使用其的色彩輝度計、及使用其的色彩計。　　為了實現上述目的，反映本發明的一側面的測定用光學系統、色彩輝度計及色彩計，具備：光圈；將入射光導光的光導波路；配置於光圈的物體側，使來自測定對象的光像成像於光圈的開口面的第1光學系統；配置於光圈與光導波路之間，以使從光圈的開口面出射的各光束的各主光線成為與光軸平行的方式入射至光導波路的第2光學系統。　　由發明的1或複數實施形態所提供的優點及特徵，從以下提供的詳細說明及圖式可充分理解。該等詳細說明及圖式，僅作為例示提供，並沒有要限定本發明的意圖。The present invention has been made in view of the foregoing circumstances, and an object thereof is to provide a measuring optical system capable of guiding a larger amount of light from a measurement object to a light receiving unit, a color luminance meter using the same, and a color meter using the same. In order to achieve the above object, a measurement optical system, a color luminance meter, and a color meter reflecting one aspect of the present invention include: an aperture; an optical waveguide that guides incident light; and is arranged on the object side of the aperture to make a light image from the measurement object The first optical system that forms an image on the aperture surface of the diaphragm; the second optical system that is arranged between the aperture and the optical waveguide so that each principal ray of each light beam emitted from the aperture surface of the diaphragm is incident on the optical waveguide in parallel with the optical axis Optical system.的 The advantages and features provided by one or more embodiments of the invention can be fully understood from the detailed description and drawings provided below. These detailed descriptions and drawings are provided as examples only, and are not intended to limit the present invention.

以下，根據圖式說明本發明的實施的一形態。但是，發明的範圍並不限於揭示的實施形態。此外，在各圖中附加相同符號的構成表示相同的構成，適宜省略其說明。在本說明書中，總稱時會以省略添附文字的參照符號表示，指個別的構成時會以附加添附文字的參照符號表示。 (第1實施形態) 　　圖1為表示第1實施形態中的色彩輝度計的構成的區塊圖。此外，圖1也是表示後述的第2及第3實施形態中的色彩輝度計Db、Dc的構成的區塊圖。圖2為表示用於前述色彩輝度計的測定用光學系統的構成的圖。圖2A表示第1實施形態中的前述測定用光學系統，圖2B作為光導波路的一例示出纖維束陣列。圖3表示在前述測定用光學系統中，從第2光學系統的射出面到光導波路(纖維束陣列)的入射面的各光束的光線圖。圖7為表示比較例中的測定用光學系統的構成的圖。圖7A表示比較例中的前述測定用光學系統，圖7B表示在比較例中，從第2光學系統的射出面到光導波路(纖維束陣列)的入射面的各光束的光線圖。　　第1實施形態中的色彩輝度計Da，例如，如圖1所示，具備：測定用光學系統SSa、受光部1、控制處理部2a、輸入部3、輸出部4、介面部(IF部)5。　　測定用光學系統SSa為接收來自測定對象即被測定物Ob的光，並將該接收到的光向受光部1導光的光學元件。測定用光學系統SSa將在後述更具體說明。被測定物Ob在本實施形態中因為是色彩輝度計Da，故為發出光的發光體。　　受光部1為接收在測定用光學系統SSa被導光的來自被測定物Ob的光，藉由將該接收到的光進行光電變換，輸出因應該光強度的電信號的受光部件。受光部1，例如具備：將來自前述受光的被測定物Ob的光分光的分光部、將在前述分光部被分光的光進行光電變換的光電變換元件。更具體來說，在本實施形態中，因為從XYZ的3刺激值測定被測定物Ob的顏色及輝度，受光部1具備：分別對應CIE(國際照明委員會)規定的等色函數X、Y、Z的3個X濾波器11-1、Y濾波器11-2、Z濾波器11-3、分別接收由該等X濾波器11-1、Y濾波器11-2、Z濾波器11-3所分別濾波的各光並進行光電變換的X濾波器用受光元件12-1、Y濾波器用受光元件12-2、Z濾波器用受光元件12-3。在這種受光部1中，來自被測定物Ob的光，由X濾波器11-1所濾波，該經濾波的光由X濾波器用受光元件12-1受光並進行光電變換，X濾波器用受光元件12-1輸出因應該光強度的電信號(X信號)，來自被測定物Ob的前述光，由Y濾波器11-2所濾波，該經濾波的光由Y濾波器用受光元件12-2受光並進行光電變換，Y濾波器用受光元件12-1輸出因應該光強度的電信號(Y信號)，接著，來自被測定物Ob的前述光，由Z濾波器11-3所濾波，該經濾波的光由Z濾波器用受光元件12-3受光並進行光電變換，Y濾波器用受光元件12-1輸出因應該光強度的電信號(Z信號)。受光部1連接至控制處理部2a，該等X信號、Y信號及Z信號被輸出至控制處理部2a。　　輸入部3連接至控制處理部2a，例如，為將指示測定對象即被測定物Ob的測定的指令等各種指令、及例如被測定物Ob的識別子(試料編號或ID或名稱等)的輸入等的測定上必要的各種資料輸入至色彩輝度計Da的裝置，例如，為分配預定機能的複數輸入開關等。輸出部4連接至控制處理部2a，為依照控制處理部2a的控制，將從輸入部3輸入的指令或資料、及由該色彩輝度計Da測定到的被測定物Ob的顏色及輝度輸出的裝置，例如，為CRT顯示器、LCD(液晶顯示裝置)及有機EL顯示器等顯示裝置或印刷機等的印刷裝置等。　　此外，從輸入部3及輸出部4構成觸控面板也可以。構成該觸控面板時，輸入部3例如為檢出電阻膜方式及電容方式等的操作位置並輸入的位置輸入裝置，輸出部4為顯示裝置。在該觸控面板中，在顯示裝置的顯示面上設置位置輸入裝置，顯示能輸入至顯示裝置的1或複數輸入內容的候選，使用者碰觸顯示欲輸入的輸入內容的顯示位置時，由位置輸入裝置來檢出該位置，並將顯示於檢出到的位置的顯示內容作為使用者的操作輸入內容輸入至色彩輝度計Da。在該種觸控面板中，使用者因為容易直覺地理解輸入操作，對使用者來說能提供容易操作的色彩輝度計Da。　　IF部5連接至控制處理部2a，為依照控制處理部2a的控制，與外部機器之間進行資料的輸入輸出的電路，例如，為串列通信方式即RS-232C的介面電路、使用Bluetooth(註冊商標)規格的介面電路、IrDA(Infrared Data Asscoiation)規格等的進行紅外線通信的介面電路、及利用USB(Universal Serial Bus)規格的介面電路等。又，IF部5為與外部機器之間進行通信的電路，例如，也可以是資料通信卡、或依照IEEE802．11規格等的通信介面電路等。　　控制處理部2a將色彩輝度計Da的各部1、3～5因應該各部的機能分別進行控制，掌控色彩輝度計Da全體的控制。接著，控制處理部2a因應輸入部3受理到的指示在測定用光學系統SSa及受光部1測定來自被測定物Ob的光，基於從受光部1輸出的電信號求出被測定物Ob的顏色及輝度，將該求出的被測定物Ob的顏色及輝度輸出至輸出部4。又因應必要，控制處理部2a將前述求出的被測定物Ob的顏色及輝度從IF部5輸出。在本實施形態中，控制處理部2a從由受光部1輸出的X信號、Y信號及Z信號藉由公知的手法求出被測定物Ob的顏色及輝度。控制處理部2a，例如，具備微處理器而構成。　　關於測定用光學系統SSa以下更具體說明。測定用光學系統SSa，例如，如圖2所示具備第1光學系統OSa-1、光圈DI、第2光學系統OSa-2、光導波路OP。　　光圈DI為限制測定徑的光學元件，例如，為具有因應前述測定徑的圓形的貫通開口，且具遮光性的板狀構件。前述貫通開口形成開口面。　　光導波路OP為將入射光導光的光學元件，在本實施形態中，因為將來自被測定物Ob的光分別導光至受光部1中的3個X濾波器11-1、Y濾波器11-2及Z濾波器11-3，為將入射光分歧成3個的光分歧器。更具體來說，在本實施形態中，光導波路OP如圖2B所示，將成束的複數光纖母線在途中分成3個束，將從1個入射面入射的入射光從3個第1至第3出射面分別射出的纖維束陣列。　　第1光學系統OSa-1配置於光圈DI的物體側(被測定物Ob側)，為使來自測定對象的被測定物Ob的光像作為中間像成像於光圈DI的開口面的光學元件。更具體來說，在本實施形態中，第1光學系統OSa-1如圖2A所示，具有正的折射力(光功率、焦距的倒數)，由使來自測定對象的被測定物Ob的光像成為物體側遠心的方式作為中間像成像於光圈DI的開口面的2個第1及第2透鏡群Gra-1、Gra-2所構成。因此，如圖2A所示，從被測定物Ob出射的各光束的各主光線以成為與光軸平行的方式入射至第1透鏡群Gra-1。此外，所謂的主光線與光軸平行，不只是主光線與光軸完全平行的情形，因為製造偏差等，而即便主光線離光軸在±1度的範圍內有偏差，也在誤差的範圍內視為平行。第1及第2透鏡群Gra-1、Gra-2也與後述的各透鏡群Grb～Grf同樣，具備1或複數透鏡而構成。　　第2光學系統OSa-2配置於光圈DI與光導波路OP之間，為以使從光圈DI的開口面出射的各光束的各主光線成為與光軸平行的方式入射至光導波路OP的光學元件。亦即，第2光學系統OSa-2為像側遠心的中繼透鏡，例如，由1個透鏡群Grb所構成。　　在該種測定用光學系統SSa中，如上述可明白，依序配置有第1光學系統OSa-1、光圈DI、第2光學系統OSa-2及光導波路OP。光圈DI配置於第1光學系統OSa-1的成像位置。來自測定對象的被測定物Ob的光，以該各光束的各主光線與光軸成為平行的方式入射至第1光學系統OSa-1的第1透鏡群Gra-1。第1光學系統OSa-1藉由該正的折射力，使來自被測定物Ob的光像作為中間像成像於光圈DI的開口面，光圈DI將來自被測定物Ob的光限制在測定徑，並使其入射至第2光學系統OSa-2。藉此測定用光學系統SSa能夠實現均勻且邊緣尖的測定靈敏度，即便是較小的測定徑也能將更多的光量導光。又，因為藉由第2光學系統OSa-2如同兩側遠心的情形不會成為成像關係，故測定用光學系統SSa不容易受到測定面的虹斑的影響。　　接著，第2光學系統OSa-2使來自由光圈DI所限制的被測定物Ob的光，以各光束的各主光線成為平行於光軸的方式入射至光導波路OP。因此，測定用光學系統SSa，能夠降低因軸外的光束具有大入射角而產生的光量損耗，集光效率佳。利用比較例詳細說明。該比較例的測定用光學系統SSr如圖7所示，除了使用非像側遠心的透鏡群Grr來取代第2光學系統OSa-2的透鏡群Grb以外，與圖2所示的上述測定用光學系統SSa具有同樣的構成。　　一般入射至光導波路的光的傳遞會由前述光導波路的開口數NA所限制。亦即，在因應光導波路的開口數NA的立體角以內入射的光能夠在前述光導波路傳遞，超過因應光導波路的開口數NA的立體角入射的光無法在前述光導波路傳遞。因此，光導波路OP在本實施形態中為了藉由纖維束陣列OP使更多光量入射，使測定用光學系統SSa的像側的開口數NA1與光導波路(纖維束陣列)OP的開口數NA2一致是有效率的。即便這樣使開口數NA1與開口數NA2相互一致，在比較例中的測定用光學系統SSr的情形中，如圖7B所示，由光線A_+1、A_0、A_-1所構成的軸上光束能夠在所有光導波路(纖維束陣列)OP傳遞，但因為透鏡群Grr非像側遠心，由光線B_+1、B_0、B_-1所構成的軸外光束會存在超過因應光導波路(纖維束陣列)OP的開口數NA2的立體角而入射的光線，故無法在所有光導波路(纖維束陣列)OP傳遞，而產生光量消耗。亦即，軸外的光束因為具有大入射角而產生光量損耗。另一方面，在本實施形態的測定用光學系統SSa的情形，如圖2C所示，因為由光線A_+1、A_0、A_-1所構成的軸上光束，本來第2光學系統OSa-2的透鏡群Grr為像側遠心，由光線B_+1、B_0、B_-1所構成的軸外光束，其光束中心也會與軸上光束一樣垂直入射，能夠在所有光導波路(纖維束陣列)OP傳遞。因此，本實施形態的測定用光學系統SSa，能夠降低因軸外的光束具有大入射角而產生的光量損耗，集光效率佳。　　接著，光導波路OP，在本實施形態中入射至纖維束陣列OP的來自被測定物Ob的光在纖維束陣列OP傳播，從被分成3個的第1至第3出射面分別射出。　　以光導波路OP的出射面對向受光部1的入射面的方式，配置光導波路OP與受光部1。在本實施形態中，如圖2B所示，以纖維束陣列OP的第1出射面對向受光部1的X濾波器11-1的入射面的方式，且以纖維束陣列OP的第2出射面對向受光部1的Y濾波器11-2的入射面的方式，且以纖維束陣列OP的第3出射面對向受光部1的Z濾波器11-3的入射面的方式，配置纖維束陣列OP與受光部1。　　從光導波路OP出射的來自被測定物Ob的光入射至受光部1。在本實施形態中，從纖維束陣列OP的第1出射面出射的來自被測定物Ob的光入射至受光部1的X濾波器11-1，在X濾波器11-1濾波，該經濾波的光由X濾波器用受光元件12-1受光。從纖維束陣列OP的第2出射面出射的來自被測定物Ob的光入射至受光部1的Y濾波器11-2，在Y濾波器11-2濾波，該經濾波的光由Y濾波器用受光元件12-2受光。接著，從纖維束陣列OP的第3出射面出射的來自被測定物Ob的光入射至受光部1的Z濾波器11-3，在Z濾波器11-1濾波，該經濾波的光由Z濾波器用受光元件12-3受光。　　接著，如同上述，X濾波器用受光元件12-1將因應在X濾波器11-1濾波的光的光強度的X信號向控制處理部2a輸出，Y濾波器用受光元件12-2將因應在Y濾波器11-2濾波的光的光強度的Y信號向控制處理部2a輸出，Z濾波器用受光元件12-3將因應在Z濾波器11-3濾波的光的光強度的Z信號向控制處理部2a輸出。控制處理部2a從由受光部1輸出的X信號、Y信號及Z信號求出被測定物Ob的顏色及輝度，將該求出的被測定物Ob的顏色及輝度輸出至輸出部4。　　如同以上說明，用於本實施形態的色彩輝度計Da的測定用光學系統SSa，第1光學系統OSa-1使來自測定對象的被測定物Ob的光像成像於光圈DI的開口面並形成中間像，第2光學系統OSa-2以使從光圈DI的開口面出射的各光束的各主光線平行於光軸的方式使其入射光導波路(本實施形態中為纖維束陣列)OP。因此，上述測定用光學系統SSa，能夠降低因軸外的光束具有大入射角而產生的光量損耗，集光效率佳。因為上述測定用光學系統SSa形成前述中間像，能夠實現均勻且邊緣尖的測定靈敏度，即便是較小的測定徑也能將更多的光量導光。因此，上述測定用光學系統SSa能將更多的光量從被測定物Ob導光至受光部1。　　上述測定用光學系統SSa，因為藉由第2光學系統OSa-2如同兩側遠心的情形不會成為成像關係，故不容易受到測定面的虹斑的影響。上述測定用光學系統SSa，因為第1光學系統OSa-1由2個的第1及第2透鏡群Gra-1、Gra-2所構成，能將更多光量集光，因應必要也變得容易補正色像差。　　因為使用這種測定用光學系統SSa，第1實施形態中的色彩輝度計Da能提升SN比，能以更高精度測色。上述色彩輝度計Da對於低輝度域的測定特別有利。又，上述色彩輝度計Da能使測定徑更小，能夠提升空間解析度。 (第2實施形態) 　　接著，說明關於別的實施形態。圖4為表示第2實施形態中的測定用光學系統的構成的圖。　　第1實施形態中的色彩輝度計Da使用具備2個的第1及第2透鏡群Gra-1、Gra-2的測定用光學系統SSa，雖在該等第1及第2透鏡群Gra-1、Gra-2形成被測定物Ob的中間像，但在第2實施形態中的色彩輝度計Db為使用以1個透鏡群Grc形成中間像的測定用光學系統SSb者。　　這種第2實施形態中的色彩輝度計Db，例如，如圖1所示，具備：測定用光學系統SSb、受光部1、控制處理部2a、輸入部3、輸出部4、IF部5。該等第2實施形態的色彩輝度計Db中的受光部1、控制處理部2a、輸入部3、輸出部4及IF部5分別與第1實施形態的色彩輝度計Da中的受光部1、控制處理部2a、輸入部3、輸出部4及IF部5相同，故省略該說明。　　用於第2實施形態中的色彩輝度計Db的測定用光學系統SSb，例如，如圖4所示具備第1光學系統OSb-1、光圈DI、第2光學系統OSb-2、光導波路OP。　　光圈DI與第1實施形態的測定用光學系統SSa一樣為限制測定徑的光學元件。光導波路OP與第1實施形態的測定用光學系統SSa一樣，為將入射光導光的光學元件，在本實施形態中也是1入射3出射的纖維束陣列OP。　　第1光學系統OSb-1配置於光圈DI的物體側(被測定物Ob側)，為使來自測定對象的被測定物Ob的光像作為中間像成像於光圈DI的開口面的光學元件。更具體來說，在本實施形態中，第1光學系統OSb-1如圖4所示，具有正的折射力，由使來自測定對象的被測定物Ob的光像成為物體側遠心的方式作為中間像成像於光圈DI的開口面的1個透鏡群Grc所構成。　　第2光學系統OSb-2配置於光圈DI與光導波路OP之間，為以使從光圈DI的開口面出射的各光束的各主光線成為與光軸平行的方式入射至光導波路OP的光學元件。亦即，第2光學系統OSb-2為像側遠心的中繼透鏡，例如，由1個透鏡群Grd所構成。　　這種用於第2實施形態中的色彩輝度計Db的測定用光學系統SSb，與用於第1實施形態中的色彩輝度計Da的測定用光學系統SSa一樣，能夠降低因軸外的光束具有大入射角而產生的光量損耗，集光效率佳。上述測定用光學系統SSb能夠實現均勻且邊緣尖的測定靈敏度，即便是較小的測定徑也能將更多的光量導光。因此，上述測定用光學系統SSb能將更多的光量從被測定物Ob導光至受光部1。上述測定用光學系統SSb，不容易受到測定面的虹斑的影響。　　接著，上述測定用光學系統SSb，因為第1光學系統OSb-1由1個透鏡群Grc所構成，能更簡易地構成。　　因為使用這種測定用光學系統SSb，第2實施形態中的色彩輝度計Db能達到與第1實施形態中的色彩輝度計Da一樣的作用效果。 (第3實施形態) 　　接著，說明關於別的實施形態。圖5為表示第3實施形態中的測定用光學系統的構成的圖。　　第1及第2實施形態中的色彩輝度計Da、Db使用具備物體側遠心的第1光學系統OSa-1、OSb-1的測定用光學系統SSa、SSb，但在第3實施形態中的色彩輝度計Dc為使用特別是具備非物體側遠心的通常的第1光學系統OSc-1的測定用光學系統SSc者。　　這種第3實施形態中的色彩輝度計Dc，例如，如圖1所示，具備：測定用光學系統SSc、受光部1、控制處理部2a、輸入部3、輸出部4、IF部5。該等第3實施形態的色彩輝度計Dc中的受光部1、控制處理部2a、輸入部3、輸出部4及IF部5分別與第1實施形態的色彩輝度計Da中的受光部1、控制處理部2a、輸入部3、輸出部4及IF部5相同，故省略該說明。　　用於第3實施形態中的色彩輝度計Dc的測定用光學系統SSc，例如，如圖5所示具備第1光學系統OSc-1、光圈DI、第2光學系統OSc-2、光導波路OP。　　光圈DI與第1實施形態的測定用光學系統SSa一樣為限制測定徑的光學元件。光導波路OP與第1實施形態的測定用光學系統SSa一樣，為將入射光導光的光學元件，在本實施形態中也是1入射3出射的纖維束陣列OP。　　第1光學系統OSc-1配置於光圈DI的物體側(被測定物Ob側)，為使來自測定對象的被測定物Ob的光像作為中間像成像於光圈DI的開口面的光學元件。更具體來說，在本實施形態中，第1光學系統OSc-1如圖5所示，具有正的折射力，由使來自測定對象的被測定物Ob的光像作為中間像成像於光圈DI的開口面的1個透鏡群Gre所構成。透鏡群Gre特別不需要是物體側遠心，是通常的光學系統即可。此外，第1光學系統OSc-1具有正的折射力，由使來自測定對象的被測定物Ob的光像作為中間像成像於光圈DI的開口面的複數透鏡群Gre所構成也可以。　　第2光學系統OSc-2配置於光圈DI與光導波路OP之間，為以使從光圈DI的開口面出射的各光束的各主光線與光軸平行的方式入射至光導波路OP的光學元件。亦即，第2光學系統OSc-2為像側遠心的中繼透鏡，例如，由1個透鏡群Grf所構成。　　這種用於第3實施形態中的色彩輝度計Dc的測定用光學系統SSc，與用於第1實施形態中的色彩輝度計Da的測定用光學系統SSa一樣，能夠降低因軸外的光束具有大入射角而產生的光量損耗，集光效率佳。上述測定用光學系統SSc能夠實現均勻且邊緣尖的測定靈敏度，即便是較小的測定徑也能將更多的光量導光。因此，上述測定用光學系統SSc能將更多的光量從被測定物Ob導光至受光部1。上述測定用光學系統SSc，不容易受到測定面的虹斑的影響。　　因為使用這種測定用光學系統SSc，第3實施形態中的色彩輝度計Dc能達到與第1實施形態中的色彩輝度計Da一樣的作用效果。 (第4及第6實施形態) 　　接著，說明關於別的實施形態。圖6為表示第4至第6實施形態中的色彩計的構成的區塊圖。　　第1至第3實施形態為分別使用測定用光學系統SSa、SSb、SSc的色彩輝度計Da、Db、Dc，但第4至第6實施形態為分別使用測定用光學系統SSa、SSb、SSc的色彩計Dd、De、Df。　　這種第4實施形態中的色彩輝度計Dd，例如，如圖6所示，具備：測定用光學系統SSa、受光部1、控制處理部2b、輸入部3、輸出部4、IF部5、照明部7。該等第4實施形態的色彩計Dd中的測定用光學系統SSa、受光部1、輸入部3、輸出部4及IF部5分別與第1實施形態的色彩輝度計Da中的測定用光學系統SSa、受光部1、輸入部3、輸出部4及IF部5相同，故省略該說明。　　照明部7為以預定的幾何圖將照明光照射至被測定物Ob的照射裝置，例如，具備：連接至控制處理部2b，並依照控制處理部2b的控制放射光的光源部、將從前述光源部放射的光以前述預定的幾何圖作為照明光照射至被測定物Ob的照明光學系統。在圖6中，作為一例雖圖示45°：0°的幾何圖，但幾何圖並不限於此，任意即可。　　控制處理部2b將色彩計Dd的各部1、3～5、7因應該各部的機能分別進行控制，掌控色彩輝度計Dd全體的控制。接著，控制處理部2b因應輸入部3受理到的指示在測定用光學系統SSa及受光部1測定來自被測定物Ob的光，並基於從受光部1輸出的電信號求出被測定物Ob的顏色，將該求出的被測定物Ob的顏色輸出至輸出部4。又因應必要，控制處理部2b將前述求出的被測定物Ob的顏色從IF部5輸出。在本實施形態中，控制處理部2b從由受光部1輸出的X信號、Y信號及Z信號，由公知的方法求出被測定物Ob的顏色。控制處理部2b，例如，具備微處理器而構成。　　在這種第4實施形態的色彩計Dd中，照明部7以照明光照明被測定物Ob，該反射光入射至測定用光學系統SSa。來自被測定物Ob的光(這裡為反射光)，藉由測定用光學系統SSa而與第1實施形態一樣被導光，由受光部1受光並在受光部1作為X信號、Y信號及Z信號進行光電變換。受光部1將該等X信號、Y信號及Z信號輸出至控制處理部2b，控制處理部2b從該等X信號、Y信號及Z信號求出被測定物Ob的顏色，將該求出的被測定物Ob的顏色輸出至輸出部4。　　用於這種第4實施形態中的色彩計Db的測定用光學系統SSa，能達到與第1實施形態一樣的作用效果。因為使用這種測定用光學系統SSa，第4實施形態中的色彩計Dd能提升SN比，能以更高精度測色。上述色彩計Dd對於低輝度域的測定特別有利。又，上述色彩計Dd能使測定徑更小，能夠提升空間解析度。　　這種第5實施形態中的色彩計De，例如，如圖6所示，具備：測定用光學系統SSb、受光部1、控制處理部2b、輸入部3、輸出部4、IF部5、照明部7。該等第5實施形態的色彩計De中的受光部1、輸入部3、輸出部4及IF部5分別與第1實施形態的色彩輝度計Da中的受光部1、輸入部3、輸出部4及IF部5相同，故省略該說明。第5實施形態的色彩計De中的測定用光學系統SSb與第2實施形態的色彩輝度計Db中的測定用光學系統SSb相同，故省略該說明。該等第5實施形態的色彩計De中的控制處理部2b及照明部7分別與第4實施形態的色彩輝度計Dd中的控制處理部2b及照明部7相同，故省略該說明。　　用於這種第5實施形態中的色彩計De的測定用光學系統SSb，能達到與第2實施形態一樣的作用效果。因為使用這種測定用光學系統SSb，第5實施形態中的色彩計De能達到與第4實施形態中的色彩輝度計Dd一樣的作用效果。　　這種第6實施形態中的色彩計Df，例如，如圖6所示，具備：測定用光學系統SSc、受光部1、控制處理部2b、輸入部3、輸出部4、IF部5、照明部7。該等第6實施形態的色彩計Df中的受光部1、輸入部3、輸出部4及IF部5分別與第1實施形態的色彩輝度計Da中的受光部1、輸入部3、輸出部4及IF部5相同，故省略該說明。第6實施形態的色彩計Df中的測定用光學系統SSc與第3實施形態的色彩輝度計Dc中的測定用光學系統SSc相同，故省略該說明。該等第6實施形態的色彩計Df中的控制處理部2b及照明部7分別與第4實施形態的色彩輝度計Dd中的控制處理部2b及照明部7相同，故省略該說明。　　用於這種第6實施形態中的色彩計Df的測定用光學系統SSc，能達到與第3實施形態一樣的作用效果。因為使用這種測定用光學系統SSa，第6實施形態中的色彩計Df能達到與第4實施形態中的色彩輝度計Dd一樣的作用效果。　　此外，在上述第1至第6實施形態中，測定用光學系統SSa～SSc中的第2光學系統OSa-2、OSb-2、OSc-2中的像側開口數NA1也可以是光導波路(上述中的纖維束陣列)OP的開口數NA2以上(NA1≧NA2)。在這種測定用光學系統SSa～SSc中，因為NA1≧NA2，從測定用光學系統SSa～SSc出射的光，其一部分不在光導波路(纖維束陣列)OP傳遞，雖產生光量損耗，但從利用圖2C及圖7B的上述說明可明白，該產生的光量損耗的損耗量相較於從前能夠更為降低。該等實施形態中的測定用光學系統SSa～SSc為NA1≧NA2時為有效的。　　在本說明書雖揭示上述各種態樣的技術，其中主要技術整理如下。　　一態樣的測定用光學系統，具備：光圈；將入射光導光的光導波路；配置於前述光圈的物體側，使來自測定對象的光像成像於前述光圈的開口面的第1光學系統；配置於前述光圈與前述光導波路之間，以使從前述光圈的開口面出射的各光束的各主光線成為與光軸平行的方式入射至前述光導波路的第2光學系統。　　該種測定用光學系統，第1光學系統使來自測定對象的光像成像於前述光圈的開口面並形成中間像，第2光學系統以使從光圈的開口面出射的各光束的各主光線成為與光軸平行的方式入射至前述光導波路。因此，上述測定用光學系統，能夠降低因軸外的光束具有大入射角而產生的光量損耗，集光效率佳。因為上述測定用光學系統形成前述中間像，能夠實現均勻且邊緣尖的測定靈敏度，即便是較小的測定徑也能將更多的光量導光。因此，上述測定用光學系統能將更多的光量從被測定物導光至受光部。　　在其他一態樣中，在上述測定用光學系統中，前述第1光學系統具有正的折射力，且由使來自測定對象的光像成為物體側遠心的方式成像於前述光圈的開口面的2個第1及第2透鏡群所構成。　　上述測定用光學系統，因為藉由前述第2光學系統如同兩側遠心的情形不會成為成像關係，故不容易受到測定面的虹斑的影響。上述測定用光學系統，因為前述第1光學系統由2個的第1及第2透鏡群所構成，能將更多光量集光，因應必要也變得容易補正色像差。　　在其他一態樣中，在上述測定用光學系統中，前述第1光學系統具有正的折射力，且由使來自測定對象的光像成為物體側遠心的方式成像於前述光圈的開口面的1個透鏡群所構成。　　這種測定用光學系統根據與前述態樣相同的理由，不容易受到測定面的虹斑的影響。上述測定用光學系統，因為前述第1光學系統由1個透鏡群所構成，能更簡易地構成。　　在其他一態樣中，在上述測定用光學系統中，前述第2光學系統中的像側開口數NA1為前述光導波路的開口數NA2以上(NA1≧NA2)。　　這種測定用光學系統雖產生光量損耗，但該產生的光量損耗的損耗量相較於從前能夠更為降低。　　其他一態樣的色彩輝度計，係使用該等上述中的任一測定用光學系統。　　這種色彩輝度計，因為使用該等上述中的任一測定用光學系統，能將更多的光量從被測定物導光至受光部。因此，上述色彩輝度計能夠提升SN比(Signal-to-Noise ratio)，能以更高精度測色。上述色彩輝度計對於低輝度域的測定特別有利。又，上述色彩輝度計能使測定徑更小，能夠提升空間解析度。　　其他一態樣的色彩計，係使用該等上述中的任一測定用光學系統。　　這種色彩計，因為使用該等上述中的任一測定用光學系統，能將更多的光量從被測定物導光至受光部。因此，上述色彩計能夠提升SN比(Signal-to-Noise ratio)，能以更高精度測色。對於低輝度域的測定特別有利。又，上述色彩計能使測定徑更小，能夠提升空間解析度。　　本申請案是以2017年6月15日申請的日本專利發明申請號2017-117588為基礎，將其內容包含至本案中。　　本發明的實施形態詳如圖示且進行說明，但其不單限於圖例及實例。本發明的範圍應以申請專利範圍的文言進行解釋。　　為了表現本發明，雖在上述中參照圖式通過實施形態適切且充分說明本發明，但應意識到該技術領域的通常知識者能夠輕易變更及/或改良上述實施形態。因此，技術領域的通常知識者實施的變更形態或改良形態，只要不脫離申請專利範圍所記載的請求項的權利範圍的話，該變更形態或改良形態應解釋為包含於該請求項的權利範圍中。 [產業上的利用可能性] 　　根據本發明，能提供將來自被測定物的光導光至受光部的測定用光學系統、使用其的色彩輝度計、及使用其的色彩計。Hereinafter, one embodiment of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. It should be noted that the structures having the same reference numerals in the drawings represent the same structures, and descriptions thereof are appropriately omitted. In this specification, the generic name will be indicated by a reference symbol omitting additional characters, and the individual structure will be indicated by a reference symbol affixed with additional characters. (First Embodiment) FIG. 1 is a block diagram showing a configuration of a color luminance meter in a first embodiment. FIG. 1 is also a block diagram showing the configuration of the color luminance meters Db and Dc in the second and third embodiments described later. FIG. 2 is a diagram showing a configuration of an optical system for measurement used in the color luminance meter. FIG. 2A shows the optical system for measurement in the first embodiment, and FIG. 2B shows a fiber bundle array as an example of an optical waveguide. FIG. 3 shows a light ray diagram of each light beam from the exit surface of the second optical system to the entrance surface of the optical waveguide (fiber bundle array) in the measurement optical system. FIG. 7 is a diagram showing a configuration of a measurement optical system in a comparative example. FIG. 7A shows the optical system for measurement in the comparative example, and FIG. 7B shows a ray diagram of each light beam from the exit surface of the second optical system to the entrance surface of the optical waveguide (fiber bundle array) in the comparative example. The color luminance meter Da in the first embodiment includes, for example, as shown in FIG. 1, an optical system for measurement SSa, a light receiving section 1, a control processing section 2a, an input section 3, an output section 4, and an interface section (IF section). 5. The measurement optical system SSa is an optical element that receives light from the measurement target Ob, which is a measurement object, and guides the received light to the light receiving unit 1. The measurement optical system SSa will be described in more detail later. The object to be measured Ob is a luminous body that emits light because it is a color luminance meter Da in this embodiment. (1) The light receiving unit 1 is a light receiving member that receives light from the measurement object Ob guided by the measurement optical system SSa, and performs photoelectric conversion on the received light to output an electric signal according to the light intensity. The light receiving unit 1 includes, for example, a light splitting unit that splits light from the light-receiving object Ob, and a photoelectric conversion element that photoelectrically converts the light split by the light splitting unit. More specifically, in the present embodiment, since the color and brightness of the measurement target Ob are measured from the three stimulus values of XYZ, the light receiving unit 1 includes corresponding isochromatic functions X, Y, and The three X filters 11-1, Y filters 11-2, and Z filters 11-3 of Z receive the X filters 11-1, Y filters 11-2, and Z filters 11-3, respectively. The X-filter light-receiving element 12-1, the Y-filter light-receiving element 12-2, and the Z-filter light-receiving element 12-3 are subjected to photoelectric conversion of the respective filtered lights. In such a light receiving unit 1, the light from the measurement target Ob is filtered by the X filter 11-1, and the filtered light is received by the X filter light receiving element 12-1 and subjected to photoelectric conversion, and the X filter receives light The element 12-1 outputs an electric signal (X signal) according to the light intensity. The aforementioned light from the object Ob is filtered by the Y filter 11-2, and the filtered light is received by the Y filter light receiving element 12-2. Receive light and perform photoelectric conversion. The Y filter light receiving element 12-1 outputs an electric signal (Y signal) corresponding to the light intensity. Then, the aforementioned light from the object Ob is filtered by the Z filter 11-3. The filtered light is received by the Z filter light receiving element 12-3 and subjected to photoelectric conversion, and the Y filter light receiving element 12-1 outputs an electric signal (Z signal) according to the light intensity. The light receiving section 1 is connected to the control processing section 2a, and these X signals, Y signals, and Z signals are output to the control processing section 2a. The input unit 3 is connected to the control processing unit 2a. For example, the input unit 3 is various instructions such as a command instructing the measurement of the measurement target Ob, which is the measurement target, and the input of the identifier (sample number, ID, or name) of the measurement ob. Various data necessary for the measurement are input to the device of the color luminance meter Da, for example, a plurality of input switches for assigning predetermined functions. The output unit 4 is connected to the control processing unit 2a, and outputs the command or data input from the input unit 3 and the color and luminance of the measured object Ob measured by the color luminance meter Da according to the control of the control processing unit 2a. The device is, for example, a display device such as a CRT display, an LCD (Liquid Crystal Display) and an organic EL display, or a printing device such as a printer. In addition, a touch panel may be configured from the input section 3 and the output section 4. When the touch panel is configured, the input unit 3 is, for example, a position input device that detects and inputs an operation position such as a resistive film system and a capacitive system, and the output unit 4 is a display device. In this touch panel, a position input device is provided on a display surface of a display device, and 1 or plural candidates for input content that can be input to the display device are displayed. When a user touches a display position where input content to be input is displayed, The position input device detects the position, and inputs the display content displayed at the detected position as a user's operation input content to the color luminance meter Da. In this type of touch panel, since the user can intuitively understand the input operation, it is possible for the user to provide an easy-to-operate color luminance meter Da. The IF section 5 is connected to the control processing section 2a and is a circuit for inputting and outputting data to and from an external device according to the control of the control processing section 2a. For example, it is an RS-232C interface circuit that is a serial communication method, and uses Bluetooth ( (Registered trademark) standard interface circuits, IrDA (Infrared Data Asscoiation) standard interface circuits for infrared communication, and interface circuits using USB (Universal Serial Bus) standards. The IF unit 5 is a circuit that communicates with an external device. For example, the IF unit 5 may be a data communication card or a communication interface circuit in accordance with the IEEE802.11 standard. (2) The control processing unit 2a controls each part 1, 3 to 5 of the color luminance meter Da according to the function of each part, and controls the overall control of the color luminance meter Da. Next, the control processing unit 2a measures the light from the object Ob in the measurement optical system SSa and the light receiving unit 1 in response to the instruction received by the input unit 3, and obtains the color of the object Ob based on the electrical signal output from the light receiving unit 1. And brightness, and outputs the obtained color and brightness of the measured object Ob to the output unit 4. If necessary, the control processing unit 2 a outputs the color and brightness of the object Ob obtained as described above from the IF unit 5. In the present embodiment, the control processing unit 2a obtains the color and brightness of the object to be measured Ob from the X signal, Y signal, and Z signal output from the light receiving unit 1 by a known method. The control processing unit 2a is configured, for example, by including a microprocessor. The optical system SSa for measurement will be described in more detail below. The measurement optical system SSa includes, for example, a first optical system OSa-1, a diaphragm DI, a second optical system OSa-2, and an optical waveguide OP as shown in FIG. 2. The diaphragm DI is an optical element that restricts the measurement diameter, and is, for example, a plate-shaped member having a circular through opening corresponding to the measurement diameter and having a light-shielding property. The through-opening forms an opening surface. The optical waveguide OP is an optical element that guides incident light. In this embodiment, the light from the measurement target Ob is guided to the three X filters 11-1 and Y filters 11- in the light receiving unit 1 respectively. 2 and Z filters 11-3 are optical splitters that split incident light into three. More specifically, in this embodiment, as shown in FIG. 2B, the optical waveguide OP divides the bundled complex optical fiber bus into three bundles on the way, and the incident light incident from one incident surface is changed from three first to The fiber bundle arrays emitted from the third exit surface. The first optical system OSa-1 is an optical element that is arranged on the object side of the diaphragm DI (the object to be measured Ob side), and forms a light image from the object of measurement Ob of the measurement target as an intermediate image on the opening surface of the diaphragm DI. More specifically, in the present embodiment, as shown in FIG. 2A, the first optical system OSa-1 has a positive refractive power (optical power and inverse number of focal length), and the light from the measurement target Ob The image becomes telecentric on the object side, and is constituted by two first and second lens groups Gra-1 and Gra-2 that are formed on the aperture surface of the aperture DI as an intermediate image. Therefore, as shown in FIG. 2A, each principal ray of each light beam emitted from the measurement target Ob is incident on the first lens group Gra-1 so as to be parallel to the optical axis. In addition, the so-called main ray is parallel to the optical axis, not only when the main ray is completely parallel to the optical axis, because of manufacturing deviations, etc., even if the main ray is deviated from the optical axis within a range of ± 1 degree, the error range is Inside is considered parallel. The first and second lens groups Gra-1 and Gra-2 are also configured with one or a plurality of lenses, similar to the lens groups Grb to Grf described later. The second optical system OSa-2 is an optical element arranged between the diaphragm DI and the optical waveguide OP so that each principal ray of each light beam emitted from the opening surface of the diaphragm DI enters the optical waveguide OP so as to be parallel to the optical axis. . That is, the second optical system OSa-2 is a telecentric relay lens on the image side, and is composed of, for example, one lens group Grb. (1) As can be understood from the above-mentioned measurement optical system SSa, the first optical system OSa-1, the diaphragm DI, the second optical system OSa-2, and the optical waveguide OP are sequentially arranged. The diaphragm DI is arranged at the imaging position of the first optical system OSa-1. The light from the measurement target object Ob is incident on the first lens group Gra-1 of the first optical system OSa-1 such that each principal ray of each light beam becomes parallel to the optical axis. The first optical system OSa-1 uses the positive refractive power to form a light image from the object Ob as an intermediate image on the opening surface of the aperture DI. The aperture DI restricts the light from the object Ob to the measurement diameter. It is made incident on the second optical system OSa-2. Thereby, the measurement optical system SSa can achieve uniform and sharp edge measurement sensitivity, and can guide a larger amount of light even with a small measurement diameter. In addition, since the second optical system OSa-2 does not become an imaging relationship as if it is telecentric on both sides, the measurement optical system SSa is not easily affected by the rainbow spot on the measurement surface. (2) Next, the second optical system OSa-2 causes light from the measurement target Ob restricted by the aperture DI to enter the optical waveguide OP so that each principal ray of each light beam becomes parallel to the optical axis. Therefore, the measurement optical system SSa can reduce the amount of light loss caused by the off-axis light beam having a large incident angle, and has a high light collection efficiency. This will be described in detail using a comparative example. As shown in FIG. 7, the optical system SSR for this comparative example is the same as the optical system for measurement shown in FIG. 2 except that the non-image-side telecentric lens group Grr is used instead of the lens group Grb of the second optical system OSa-2. The system SSa has the same configuration. Generally, the transmission of light incident on the optical waveguide is limited by the number of openings NA of the optical waveguide. That is, light incident within a solid angle corresponding to the number of openings NA of the optical waveguide can be transmitted through the optical waveguide, and light incident beyond a solid angle of the number of openings NA according to the optical waveguide can not be transmitted through the optical waveguide. Therefore, in this embodiment, in order to allow a larger amount of light to be incident through the fiber bundle array OP in this embodiment, the number of openings NA1 on the image side of the optical system SSa for measurement and the number of openings NA2 of the optical waveguide (fiber bundle array) OP are the same Is efficient. Even if the number of openings NA1 and the number of openings NA2 are made to coincide with each other, in the case of the optical system for measurement SSR in the comparative example, as shown in FIG. 7B, an on-axis light beam composed of rays A_ + 1, A_0, and A_-1 Can be transmitted in all optical waveguides (fiber bundle arrays) OP, but because the lens group Grr is not telecentric on the image side, the off-axis beam composed of rays B_ + 1, B_0, B_-1 will exceed the corresponding optical waveguides (fiber bundle arrays). ) The number of light rays incident on the solid angle of the opening number NA2 of the OP cannot be transmitted through the OP in all optical waveguides (fiber bundle arrays), and the amount of light is consumed. That is, the off-axis light beam has a large amount of incident angle, and thus a light amount loss occurs. On the other hand, in the case of the measurement optical system SSa in this embodiment, as shown in FIG. 2C, the on-axis light beam composed of the light rays A_ + 1, A_0, and A_-1 is originally the second optical system OSa-2. The lens group Grr is telecentric on the image side and is an off-axis beam composed of rays B_ + 1, B_0, B_-1. The beam center will also be incident perpendicularly as the beam on the axis, and can be used in all optical waveguides (fiber bundle arrays). OP passed. Therefore, the measurement optical system SSa of this embodiment can reduce the amount of light loss caused by the off-axis light beam having a large incident angle, and has excellent light collection efficiency. Next, in the present embodiment, the light guide wave path OP, the light from the measurement target Ob, which is incident on the fiber bundle array OP, propagates through the fiber bundle array OP, and is emitted from the first to third exit surfaces divided into three. The optical waveguide OP and the light receiving unit 1 are arranged so that the exit surface of the optical waveguide OP faces the incident surface of the light receiving unit 1. In this embodiment, as shown in FIG. 2B, the first exit surface of the fiber bundle array OP faces the incident surface of the X filter 11-1 of the light receiving unit 1, and the second exit of the fiber bundle array OP The fibers are arranged so as to face the incident surface of the Y filter 11-2 of the light receiving unit 1, and the third exit surface of the fiber bundle array OP faces the incident surface of the Z filter 11-3 of the light receiving unit 1. Beam array OP and light receiving unit 1. (2) The light from the measurement target Ob, which is emitted from the optical waveguide OP, enters the light receiving unit 1. In this embodiment, light from the measurement target Ob, which is emitted from the first exit surface of the fiber bundle array OP, enters the X filter 11-1 of the light receiving unit 1, and is filtered by the X filter 11-1. The light is received by the X-filter light receiving element 12-1. The light from the measurement object Ob, which is emitted from the second exit surface of the fiber bundle array OP, enters the Y filter 11-2 of the light receiving unit 1, and is filtered by the Y filter 11-2. The filtered light is used by the Y filter. The light receiving element 12-2 receives light. Next, the light from the object to be measured Ob, which is emitted from the third exit surface of the fiber bundle array OP, enters the Z filter 11-3 of the light receiving unit 1 and is filtered by the Z filter 11-1. The filter light receiving element 12-3 receives light. Next, as described above, the X filter light receiving element 12-1 outputs an X signal corresponding to the light intensity of the light filtered by the X filter 11-1 to the control processing section 2a, and the Y filter light receiving element 12-2 will respond to the Y signal. The Y signal of the light intensity of the light filtered by the filter 11-2 is output to the control processing unit 2a. The Z filter light receiving element 12-3 sends the Z signal corresponding to the light intensity of the light filtered by the Z filter 11-3 to the control processing. Section 2a outputs. The control processing unit 2 a obtains the color and brightness of the measured object Ob from the X signal, Y signal, and Z signal output from the light receiving unit 1, and outputs the obtained color and brightness of the measured object Ob to the output unit 4. As described above, the first optical system OSa-1 used in the optical system SSa for measurement of the color luminance meter Da according to the present embodiment forms a light image from the measurement target Ob on the opening surface of the diaphragm DI to form an intermediate For example, the second optical system OSa-2 makes an optical waveguide (a fiber bundle array in this embodiment) OP so that each principal ray of each light beam emitted from the opening surface of the diaphragm DI is parallel to the optical axis. Therefore, the above-mentioned measuring optical system SSa can reduce the amount of light loss caused by the off-axis light beam having a large incident angle, and has excellent light collection efficiency. Since the above-mentioned measurement optical system SSa forms the intermediate image, it is possible to achieve a uniform and sharp-edged measurement sensitivity, and even a smaller measurement diameter can guide a larger amount of light. Therefore, the above-mentioned measurement optical system SSa can guide a larger amount of light from the object to be measured Ob to the light receiving unit 1. The above-mentioned measurement optical system SSa does not become an imaging relationship with the second optical system OSa-2 as if it is telecentric on both sides, so it is not easily affected by the rainbow spot on the measurement surface. The above-mentioned measuring optical system SSa, because the first optical system OSa-1 is composed of two first and second lens groups Gra-1 and Gra-2, can collect more light and make it easier if necessary. Correct chromatic aberration. Because the optical system SSa for such measurement is used, the color luminance meter Da in the first embodiment can increase the SN ratio and can measure color with higher accuracy. The above-mentioned color luminance meter Da is particularly advantageous for measurement in a low luminance region. In addition, the above-mentioned color luminance meter Da can make the measurement diameter smaller and improve the spatial resolution. (Second Embodiment) Next, another embodiment will be described. FIG. 4 is a diagram showing a configuration of a measurement optical system in a second embodiment. The color luminance meter Da in the first embodiment uses a measurement optical system SSa having two first and second lens groups Gra-1 and Gra-2. Although these first and second lens groups Gra-1 Although Gra-2 forms an intermediate image of the measurement target Ob, the color luminance meter Db in the second embodiment is a measurement optical system SSb that forms an intermediate image with one lens group Grc.色彩 The color luminance meter Db in this second embodiment includes, for example, a measurement optical system SSb, a light receiving section 1, a control processing section 2a, an input section 3, an output section 4, and an IF section 5 as shown in FIG. The light-receiving section 1, the control processing section 2a, the input section 3, the output section 4, and the IF section 5 of the color luminance meter Db of the second embodiment are respectively different from the light-receiving section 1 of the color luminance meter Da of the first embodiment. Since the control processing section 2a, the input section 3, the output section 4, and the IF section 5 are the same, the description is omitted.光学 The optical system SSb for measuring the color luminance meter Db in the second embodiment includes, for example, a first optical system OSb-1, a diaphragm DI, a second optical system OSb-2, and an optical waveguide OP as shown in FIG. 4. The diaphragm DI is an optical element that restricts the measurement diameter in the same manner as the measurement optical system SSa of the first embodiment. The optical waveguide OP is the same as the optical system SSa for measurement in the first embodiment, and is an optical element that guides incident light. In this embodiment, the fiber bundle array OP is also one incident and three emitted. The first optical system OSb-1 is an optical element that is arranged on the object side of the diaphragm DI (the object to be measured Ob side), and forms a light image from the measuring object Ob as an intermediate image on the opening surface of the diaphragm DI as an intermediate image. More specifically, in the present embodiment, as shown in FIG. 4, the first optical system OSb-1 has a positive refractive power, and the optical image from the object Ob to be measured is made to be telecentric on the object side as The intermediate image is formed by one lens group Grc formed on the opening surface of the diaphragm DI. The second optical system OSb-2 is an optical element arranged between the diaphragm DI and the optical waveguide OP so that each principal light ray of each light beam emitted from the opening surface of the diaphragm DI enters the optical waveguide OP so as to be parallel to the optical axis. . That is, the second optical system OSb-2 is a telecentric relay lens on the image side, and is composed of, for example, one lens group Grd. Such an optical system SSb for measuring the color luminance meter Db in the second embodiment is similar to the optical system SSa for measuring the color luminance meter Da in the first embodiment. The light quantity loss caused by the large incident angle has good light collection efficiency. The above-mentioned measurement optical system SSb can achieve uniform and sharp edge measurement sensitivity, and can guide a larger amount of light even with a small measurement diameter. Therefore, the measurement optical system SSb can guide a larger amount of light from the measurement target Ob to the light receiving unit 1. The above-mentioned measurement optical system SSb is not easily affected by the rainbow spot on the measurement surface. Next, the above-mentioned measurement optical system SSb can be configured more simply because the first optical system OSb-1 is composed of one lens group Grc. Because the measurement optical system SSb is used, the color luminance meter Db in the second embodiment can achieve the same function and effect as the color luminance meter Da in the first embodiment. (Third Embodiment) Next, another embodiment will be described. FIG. 5 is a diagram showing a configuration of a measurement optical system in a third embodiment. The color luminometers Da and Db in the first and second embodiments use the optical systems SSa and SSb for measuring the first optical system OSa-1 and OSb-1 with telecentricity on the object side, but the color in the third embodiment The luminance meter Dc is a person using an optical system SSc for measurement, which is generally equipped with a normal first optical system OSc-1 which is non-object-side telecentric.色彩 The color luminance meter Dc in this third embodiment includes, for example, a measurement optical system SSc, a light receiving unit 1, a control processing unit 2a, an input unit 3, an output unit 4, and an IF unit 5 as shown in FIG. The light-receiving section 1, the control processing section 2a, the input section 3, the output section 4, and the IF section 5 in the color luminance meter Dc of the third embodiment are respectively different from the light-receiving section 1 of the color luminance meter Da of the first embodiment. Since the control processing section 2a, the input section 3, the output section 4, and the IF section 5 are the same, the description is omitted.光学 The optical system SSc for measurement of the color luminance meter Dc in the third embodiment includes, for example, a first optical system OSc-1, a diaphragm DI, a second optical system OSc-2, and an optical waveguide OP as shown in FIG. 5. The diaphragm DI is an optical element that restricts the measurement diameter in the same manner as the measurement optical system SSa of the first embodiment. The optical waveguide OP is the same as the optical system SSa for measurement in the first embodiment, and is an optical element that guides incident light. In this embodiment, the fiber bundle array OP is also one incident and three emitted. 1The first optical system OSc-1 is an optical element that is disposed on the object side of the diaphragm DI (the object to be measured Ob side), and forms a light image from the object of measurement Ob of the measurement target as an intermediate image on the opening surface of the diaphragm DI. More specifically, in this embodiment, as shown in FIG. 5, the first optical system OSc-1 has a positive refractive power, and a light image from the measurement target object Ob is imaged as an intermediate image on the diaphragm DI. Is composed of one lens group Gre on the opening surface of the lens. The lens group Gre does not particularly need to be telecentric on the object side, and may be a general optical system. In addition, the first optical system OSc-1 has a positive refractive power, and may be composed of a plurality of lens groups Gre that form a light image from the measurement target object Ob as an intermediate image on the aperture surface of the diaphragm DI. 2The second optical system OSc-2 is disposed between the diaphragm DI and the optical waveguide OP, and is an optical element that makes the main rays of each light beam emitted from the opening surface of the diaphragm DI enter the optical waveguide OP in parallel with the optical axis. That is, the second optical system OSc-2 is a telecentric relay lens on the image side, and is composed of, for example, one lens group Grf. The optical system SSc used for measuring the color luminance meter Dc in the third embodiment is similar to the optical system SSa used for measuring the color luminance meter Da in the first embodiment. The light quantity loss caused by the large incident angle has good light collection efficiency. The above-mentioned measurement optical system SSc can achieve a uniform and sharp edge measurement sensitivity, and can guide a larger amount of light even with a smaller measurement diameter. Therefore, the above-mentioned measurement optical system SSc can guide a larger amount of light from the object to be measured Ob to the light receiving unit 1. The above-mentioned measurement optical system SSc is not easily affected by the rainbow spot on the measurement surface. Since the optical system SSc for measurement is used, the color luminance meter Dc in the third embodiment can achieve the same function and effect as the color luminance meter Da in the first embodiment. (Fourth and Sixth Embodiments) Next, other embodiments will be described. FIG. 6 is a block diagram showing the configuration of a colorimeter in the fourth to sixth embodiments. The first to third embodiments are color luminance meters Da, Db, and Dc using the measurement optical systems SSa, SSb, and SSc, respectively. The fourth to sixth embodiments are each using the measurement optical systems SSa, SSb, and SSc. Color meters Dd, De, Df. The color luminance meter Dd in the fourth embodiment includes, for example, as shown in FIG. 6, an optical system for measurement SSa, a light receiving unit 1, a control processing unit 2b, an input unit 3, an output unit 4, an IF unit 5,照明部 7。 Lighting section 7. The optical system for measurement SSa, the light receiving section 1, the input section 3, the output section 4, and the IF section 5 in the color meter Dd of the fourth embodiment are respectively different from the optical system for measurement in the color luminance meter Da of the first embodiment. The SSa, the light receiving section 1, the input section 3, the output section 4, and the IF section 5 are the same, so the description is omitted. The illuminating unit 7 is an irradiating device that irradiates illumination light to the measurement target Ob with a predetermined geometrical figure. For example, the illuminating unit 7 includes a light source unit connected to the control processing unit 2b and emitting light in accordance with the control of the control processing unit 2b. The light emitted from the light source unit is an illumination optical system that irradiates the object Ob with the predetermined geometrical pattern as illumination light. In FIG. 6, although a geometrical figure of 45 °: 0 ° is illustrated as an example, the geometrical figure is not limited to this, and may be arbitrary. (2) The control processing unit 2b controls each part 1, 3 to 5, and 7 of the color meter Dd according to the functions of each part, and controls the overall control of the color luminance meter Dd. Next, the control processing unit 2b measures the light from the measurement object Ob in the measurement optical system SSa and the light receiving unit 1 in response to the instruction received by the input unit 3, and obtains the measurement target Ob based on the electrical signal output from the light receiving unit 1. The color is output to the output unit 4 of the color of the measured object Ob. If necessary, the control processing unit 2b outputs the color of the measured object Ob as described above from the IF unit 5. In this embodiment, the control processing unit 2b obtains the color of the measurement target Ob from a X signal, a Y signal, and a Z signal output from the light receiving unit 1 by a known method. The control processing unit 2b is configured, for example, by including a microprocessor. In the colorimeter Dd of the fourth embodiment, the illumination unit 7 illuminates the measurement target Ob with illumination light, and the reflected light is incident on the measurement optical system SSa. The light from the measured object Ob (reflected light here) is guided by the measurement optical system SSa in the same manner as in the first embodiment, and is received by the light receiving unit 1 as X signals, Y signals, and Z in the light receiving unit 1. The signal undergoes photoelectric conversion. The light receiving unit 1 outputs these X signals, Y signals, and Z signals to the control processing unit 2b. The control processing unit 2b obtains the color of the measured object Ob from the X signals, Y signals, and Z signals, and calculates the obtained Ob The color of the measurement object Ob is output to the output unit 4. The optical system SSa for measuring the colorimeter Db used in such a fourth embodiment can achieve the same function and effect as those of the first embodiment. Since the optical system SSa for such measurement is used, the colorimeter Dd in the fourth embodiment can increase the SN ratio and can measure color with higher accuracy. The above-mentioned colorimeter Dd is particularly advantageous for measurement in a low luminance region. In addition, the colorimeter Dd can make the measurement diameter smaller and improve the spatial resolution. The colorimeter De in such a fifth embodiment includes, for example, a measurement optical system SSb, a light receiving unit 1, a control processing unit 2b, an input unit 3, an output unit 4, an IF unit 5, and illumination, as shown in FIG. Department 7. The light receiving section 1, input section 3, output section 4, and IF section 5 of the color meter De of the fifth embodiment are respectively different from the light receiving section 1, input section 3, and output section of the color luminance meter Da of the first embodiment. 4 and IF section 5 are the same, so this description is omitted. The optical system SSb for measurement in the color meter De according to the fifth embodiment is the same as the optical system SSb for measurement in the color luminance meter Db according to the second embodiment, and therefore description thereof is omitted. The control processing section 2b and the lighting section 7 in the color meter De of the fifth embodiment are the same as the control processing section 2b and the lighting section 7 in the color luminance meter Dd of the fourth embodiment, respectively, and therefore description thereof is omitted. (2) The optical system SSb for measurement of the colorimeter De used in such a fifth embodiment can achieve the same effect as that of the second embodiment. Because the measurement optical system SSb is used, the colorimeter De in the fifth embodiment can achieve the same effect as the colorimeter Dd in the fourth embodiment. The colorimeter Df in the sixth embodiment includes, for example, as shown in FIG. 6, an optical system for measurement SSc, a light receiving unit 1, a control processing unit 2b, an input unit 3, an output unit 4, an IF unit 5, and lighting. Department 7. The light receiving section 1, input section 3, output section 4, and IF section 5 of the color meter Df of the sixth embodiment are respectively the light receiving section 1, input section 3, and output section of the color luminance meter Da of the first embodiment. 4 and IF section 5 are the same, so this description is omitted. The optical system SSc for measurement in the color meter Df of the sixth embodiment is the same as the optical system SSc for measurement in the color luminance meter Dc of the third embodiment, and therefore description thereof is omitted. The control processing section 2b and the lighting section 7 in the color meter Df of the sixth embodiment are the same as the control processing section 2b and the lighting section 7 in the color luminance meter Dd of the fourth embodiment, respectively, and therefore description thereof is omitted. (2) The optical system SSc for measuring the colorimeter Df used in such a sixth embodiment can achieve the same effect as that of the third embodiment. Since such a measuring optical system SSa is used, the colorimeter Df in the sixth embodiment can achieve the same effect as the colorimeter Dd in the fourth embodiment. In the first to sixth embodiments, the number of image-side openings NA1 in the second optical systems OSa-2, OSb-2, and OSc-2 of the measurement optical systems SSa to SSc may be an optical waveguide ( The number of openings in the above-mentioned fiber bundle array) OP is NA2 or more (NA1 ≧ NA2). In such a measurement optical system SSa to SSc, since NA1 ≧ NA2, part of the light emitted from the measurement optical system SSa to SSc is not transmitted through the optical waveguide (fiber bundle array) OP. Although a light amount loss occurs, it is used from It can be understood from the above description of FIGS. 2C and 7B that the loss amount of the generated light amount loss can be reduced more than before. It is effective when the measurement optical systems SSa to SSc in these embodiments are NA1 ≧ NA2.虽 Although the techniques of the above various aspects are disclosed in this specification, the main techniques are as follows. One aspect of an optical system for measurement includes: an aperture; an optical waveguide that guides incident light; a first optical system that is arranged on the object side of the aperture and forms a light image from the measurement target on the aperture surface of the aperture; A second optical system between the aperture and the optical waveguide such that each principal ray of each light beam emitted from the opening surface of the aperture is incident on the optical waveguide in parallel with the optical axis. In this optical system for measurement, a first optical system forms a light image from a measurement target on the aperture surface of the aperture to form an intermediate image, and a second optical system makes each principal ray of each light beam emitted from the aperture surface of the aperture become The optical waveguide is incident parallel to the optical axis. Therefore, the optical system for measurement described above can reduce the amount of light loss caused by the off-axis light beam having a large incident angle, and has excellent light collection efficiency. Because the above-mentioned optical system for measurement forms the intermediate image, it is possible to achieve a uniform and sharp-edged measurement sensitivity, and even a smaller measurement diameter can guide a larger amount of light. Therefore, the above-mentioned measurement optical system can guide a larger amount of light from the object to be measured to the light receiving portion. In another aspect, in the optical system for measurement, the first optical system has a positive refractive power, and is formed on the aperture surface of the aperture so that a light image from the measurement target becomes telecentric on the object side. It consists of 1st and 2nd lens group. The above-mentioned optical system for measurement is not easily affected by the rainbow spots on the measurement surface because the second optical system does not become an imaging relationship as if it is telecentric on both sides. The above-mentioned optical system for measurement, because the first optical system is composed of two first and second lens groups, can collect a larger amount of light, and it becomes easier to correct chromatic aberrations if necessary. In another aspect, in the optical system for measurement, the first optical system has a positive refractive power and is formed on the aperture surface of the aperture so that a light image from the measurement object becomes telecentric on the object side. Lens group. This optical system for measurement is not easily affected by iridescent spots on the measurement surface for the same reasons as described above. The above-mentioned measurement optical system can be configured more simply because the first optical system is composed of a single lens group.其他 In another aspect, in the optical system for measurement, the number of openings on the image side NA1 in the second optical system is equal to or greater than the number of openings in the optical waveguide NA2 (NA1 ≧ NA2). Although this measurement optical system generates a loss of light amount, the loss amount of the generated light amount loss can be reduced more than before. Other color luminometers use any of the optical systems for measurement described above. This color luminance meter uses any of the above-mentioned measuring optical systems to guide a larger amount of light from the object to be measured to the light receiving section. Therefore, the above-mentioned color luminance meter can improve the SN ratio (Signal-to-Noise ratio), and can measure color with higher accuracy. The above-mentioned color luminance meter is particularly advantageous for measurement in a low luminance region. Moreover, the above-mentioned color luminance meter can make the measurement diameter smaller, and can improve the spatial resolution. The colorimeter of another aspect uses any of the optical systems for measurement described above. This colorimeter uses any of the optical systems for measurement described above to guide a larger amount of light from the measurement object to the light receiving section. Therefore, the above-mentioned colorimeter can improve the SN ratio (Signal-to-Noise ratio) and can measure color with higher accuracy. It is particularly advantageous for measurements in the low luminance region. In addition, the above-mentioned colorimeter can make the measurement diameter smaller and improve the spatial resolution. This application is based on Japanese Patent Application No. 2017-117588, filed on June 15, 2017, and its contents are incorporated into this case.的 The embodiment of the present invention is illustrated and described in detail, but it is not limited to the drawings and examples. The scope of the invention should be interpreted in the language of the patent application. In order to express the present invention, although the present invention has been described appropriately and adequately through the embodiments with reference to the drawings, it should be appreciated that those skilled in the art can easily change and / or improve the above embodiments. Therefore, as long as it does not depart from the scope of the claims described in the scope of the patent application, the forms of changes or improvements implemented by ordinary knowledgeable persons in the technical field shall be construed as being included in the scope of rights of the claims. . [Industrial Applicability] According to the present invention, it is possible to provide a measuring optical system that guides light from a measurement object to a light receiving unit, a color luminance meter using the same, and a color meter using the same.

D‧‧‧色彩輝度計D‧‧‧Color Luminance Meter

SS‧‧‧測定用光學系統SS‧‧‧ Optical System for Measurement

1‧‧‧受光部1‧‧‧ light receiving section

2a‧‧‧控制處理部2a‧‧‧Control Processing Department

3‧‧‧輸入部3‧‧‧ Input Department

4‧‧‧輸出部4‧‧‧Output Department

5‧‧‧介面部(IF部)5‧‧‧ Face (IF Department)

Ob‧‧‧被測定物Ob‧‧‧Measured

11‧‧‧濾波器11‧‧‧Filter

12‧‧‧濾波器用受光元件12‧‧‧ Filter light receiving element

OS‧‧‧光學系統OS‧‧‧ Optical System

DI‧‧‧光圈DI‧‧‧ aperture

OP‧‧‧光導波路(纖維束陣列)OP‧‧‧Optical waveguide (fiber bundle array)

Gr‧‧‧透鏡群Gr‧‧‧ lens group

7‧‧‧照明部7‧‧‧Lighting Department

[圖1]表示第1實施形態中的色彩輝度計的構成的區塊圖。　　[圖2]表示用於前述色彩輝度計的測定用光學系統的構成的圖。　　[圖3]表示在前述測定用光學系統中，從第2光學系統的射出面到光導波路的入射面的各光束的光線圖。　　[圖4]表示第2實施形態中的測定用光學系統的構成的圖。　　[圖5]表示第3實施形態中的測定用光學系統的構成的圖。　　[圖6]表示第4至第6實施形態中的色彩計的構成的區塊圖。　　[圖7]表示比較例中的測定用光學系統的構成的圖。1 is a block diagram showing a configuration of a color luminance meter in the first embodiment. [FIG. 2] A diagram showing a configuration of an optical system for measurement of the color luminance meter. [Fig. 3] shows a ray diagram of each light beam from the exit surface of the second optical system to the entrance surface of the optical waveguide in the optical system for measurement. [FIG. 4] A diagram showing a configuration of a measurement optical system in a second embodiment. [FIG. 5] A diagram showing a configuration of a measurement optical system in a third embodiment. [FIG. 6] A block diagram showing the configuration of a colorimeter in the fourth to sixth embodiments. [FIG. 7] A diagram showing a configuration of a measurement optical system in a comparative example.

Claims

An optical system for measurement, comprising: an aperture; an optical waveguide for guiding incident light; a first optical system arranged on the object side of the aperture and imaging a light image from the measurement target on the aperture surface of the aperture; arranged on the aperture A second optical system that is incident on the optical waveguide with the optical waveguide such that each principal ray of each light beam emitted from the opening surface of the diaphragm is parallel to the optical axis.

The optical system for measurement according to claim 1, wherein the first optical system has positive refractive power and is formed on the two aperture opening surfaces of the aperture so that a light image from the measurement target becomes telecentric on the object side. The first and second lens groups are configured.

The optical system for measurement according to claim 1, wherein the first optical system has a positive refractive power and is formed on the aperture surface of the aperture so that a light image from the measurement target becomes telecentric on the object side. Consists of lens groups.

The optical system for measurement according to any one of claim 1 to claim 3, wherein the number of image-side openings in the second optical system is equal to or greater than the number of openings in the optical waveguide.

A color luminance meter using the optical system for measurement described in any one of claim 1 to claim 4.

A colorimeter using the optical system for measurement described in any one of Claims 1 to 4.