JP2017156200A - Measurement-purpose optical system and colorimetry device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of variations in amounts of incidence light upon a plurality of optical filters without using a light guide member such as an optical fiber in the optical filters included in a light reception unit receiving light from a measurement object.SOLUTION: A measurement-purpose optical system 1 includes: a first optical member 2 that causes light from a measurement object (a spot area SP) to be converged; a light division unit 3 that divides the light passing through the first optical member 2 into two light; a first light reception unit 4 that is arranged at a position of a rear side focus fp1 serving as a rear side focus of the first optical member 2, and receives one light of two sub-divided light; an aperture stop 5 that is arranged at a position of a second rear side focus fp2 serving as a rear side focus of the first optical member 2; a second light reception unit 7 that is arranged at a position where the light from the spot area SP is image-formed, and receives the light passing through the aperture stop 5. The first light reception unit 4 and second light reception unit 7 include: three optical filters 11 in which a transmitting wavelength component is different, respectively; and three light reception elements 12 that are provided corresponding to each of the optical filters 11, and receive light transmitting a corresponding optical filter.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for measuring colors of a display screen, for example.

  The color measuring device is a device that measures an object to be measured using an optical sensor. The color measuring device is applied in various industrial fields, and is used, for example, for measuring the chromaticity of a display screen.

  As a conventional color measurement device, Patent Document 1 discloses an optical measurement device including a measurement optical system that realizes object-side telecentricity, and Patent Document 2 discloses a color including a measurement optical system that realizes both-side telecentricity. The total is disclosed.

JP 2000-221109 A JP 2010-2255 A

  The colorimetric devices disclosed in Patent Documents 1 and 2 include a red filter, a light receiving element that receives light transmitted through the red filter, a green filter, a light receiving element that receives light transmitted through the green filter, a blue filter, and a blue filter. A light-receiving element that receives light transmitted through the filter, and measures a color of a partial region (spot region) on the display screen. Light from the spot area enters the red filter, the green filter, and the blue filter, and is received by the light receiving element corresponding to each of these filters. If the amounts of incident light on the red, green, and blue filters vary (in other words, the amounts of incident light on the red, green, and blue filters are not the same), the colorimetric accuracy decreases.

  The light from the spot area on the measurement target may have directivity or may have unevenness. The former is that the amount of light varies depending on the emission angle of light from the spot region. The latter is that the amount of light from each point on the spot area is not uniform. In either case, the amount of incident light on the red filter, the green filter, and the blue filter may vary. For example, a liquid crystal display screen has both problems.

  If light enters the red filter, green filter, and blue filter via a light guide member such as an optical fiber, the amount of incident light on the red filter, green filter, and blue filter should not vary. Can do.

  According to the present invention, in a plurality of optical filters included in a light receiving unit that receives light from a measurement target, the amount of incident light on these optical filters does not vary without using a light guide member such as an optical fiber. It is an object of the present invention to provide a measuring optical system that can be used and a colorimetric device including the same.

  An optical system for measurement according to a first aspect of the present invention that achieves the above object includes an optical member that converges light from a measurement target, a light splitting unit that splits light that has passed through the optical member, and the two The rear focal point of the optical member located in the optical path of one of the divided lights is set as the first rear focal point, and is disposed at the position of the first rear focal point. A first light-receiving unit that receives light, and a rear focal point of the optical member that is positioned in the optical path of the other light divided into two parts is set as a second rear focal point, and is disposed at the position of the second rear focal point. And a second light receiving unit that is disposed at a position where the light from the measurement object forms an image, and that receives the light that has passed through the aperture stop in the other divided light. The first light receiving unit and the second light receiving unit have a plurality of light components having different wavelength components to be transmitted. A filter, provided corresponding to each of the plurality of optical filters, including a plurality of light receiving elements for receiving light transmitted through the corresponding optical filter, the.

  The light splitting unit splits the light from the measurement object that has passed through the optical member into two. Thereby, two back focal points of the optical member can be formed. One is a rear focal point (first rear focal point) located in the optical path of one of the two divided lights. The other one is a rear focal point (second rear focal point) located in the optical path of the other light divided into two.

  The first light receiving unit is disposed at the position of the first rear focal point. As a result, the light from each point on the measurement target is uniformly distributed to each of the plurality of optical filters. Therefore, when the light from the measurement target has unevenness (that is, the light from each point on the measurement target is Even when it is not uniform, it is possible to prevent variations in the amount of light incident on the plurality of optical filters.

  The aperture stop is disposed at the position of the second rear focal point, and the second light receiving unit is disposed at the position where the light from the measurement object is imaged, and the aperture is formed in the other light divided into two. The light passing through the aperture is received. As a result, an optical system that realizes object-side telecentricity is formed, and an image formed by this optical system is formed by the second light receiving unit, so that even if light from the measurement target has directivity, it is incident on a plurality of optical filters. Variations in the amount of light can be prevented.

  As described above, according to the measurement optical system according to the first aspect of the present invention, a plurality of light receiving units (first light receiving unit, second light receiving unit) that receive light from the measurement target are included. In this optical filter, it is possible to prevent variations in the amount of light incident on these optical filters without using a light guide member such as an optical fiber.

  A colorimetric apparatus according to a second aspect of the present invention includes the measurement optical system according to the first aspect.

  In the above configuration, using a signal output from the first light receiving unit, a first calculation unit that calculates predetermined color information of the measurement target, and a signal output from the second light receiving unit. A second calculation unit that calculates the predetermined color information of the measurement target, and a result calculated by the first calculation unit is a first measurement result, and is calculated by the second calculation unit. The result is the second measurement result, the third calculation unit that calculates the average of the first measurement result and the second measurement result, and the result calculated by the third calculation unit is the third measurement result. As the measurement result, the operation unit that is operated to preselect any one of the first measurement result, the second measurement result, and the third measurement result is selected by the operation unit. And an output unit for outputting a measurement result.

  The first measurement result is calculated based on the signal output from the first light receiving unit. As described above, even when the light from the measurement target has unevenness, it is possible to prevent variations in the amount of incident light to the plurality of optical filters included in the first light receiving unit. Therefore, even if the light from the measurement object has unevenness, it is possible to prevent the color measurement accuracy from being lowered. The operator of the color measuring device selects the first measurement result when it is known in advance that the influence of unevenness is relatively large and the influence of directivity is relatively small for the light from the measurement object.

  The second measurement result is calculated based on the signal output from the second light receiving unit. As described above, even when light from the measurement target has directivity, it is possible to prevent variations in the amount of incident light to the plurality of optical filters included in the second light receiving unit. Therefore, even if the light from the measurement object has directivity, it is possible to prevent the color measurement accuracy from being lowered. The operator of the color measuring device selects the second measurement result when it is known in advance that the influence of directivity is relatively large and the influence of unevenness is relatively small for the light from the measurement object.

  The third measurement result is a measurement result obtained by averaging the first measurement result and the second measurement result. The average may be a simple average or a weighted average. The operator of the color measurement device selects the third measurement result when it is known in advance that the influences of unevenness and directivity are large for the light from the measurement object.

  As described above, according to this configuration, when the influence of unevenness is relatively large and the influence of directivity is relatively small for the light from the measurement object, the influence of the directivity is compared for the light from the measurement object. When the influence of unevenness is relatively small and the influence of unevenness is relatively small, and the influence of unevenness and directivity are both large, it is possible to prevent the color measurement accuracy from being lowered in any case.

  As a format for outputting the measurement result selected by the operation unit, there are a format for displaying an image indicating the measurement result on a display unit and a format for printing an image indicating the measurement result on a sheet.

  In the above configuration, the operation unit is configured to measure the first measurement result, the second measurement result, the third measurement result, and both the first measurement result and the second measurement result. An operation of selecting one of the results in advance is performed.

  When the operator of the color measurement device wants to know both the first measurement result and the second measurement result, both measurement results are selected.

  In the above configuration, the operation unit includes the first measurement result, the second measurement result, the third measurement result, the measurement result of both the first measurement result and the second measurement result, In addition, an operation of preselecting any one of the three measurement results of the first measurement result, the second measurement result, and the third measurement result is performed.

  When the operator of the color measurement device wants to know three measurement results (all measurement results) of the first measurement result, the second measurement result, and the third measurement result, the three measurement results are selected.

  According to the present invention, in the plurality of optical filters included in the light receiving unit that receives light from the measurement target, the amount of incident light on these optical filters varies without using a light guide member such as an optical fiber. I can not.

It is explanatory drawing explaining the structure of the optical system for a measurement which concerns on this embodiment. It is a top view of the 1st light-receiving part seen from the incident side of light. It is explanatory drawing explaining the light which injects into a 1st light-receiving part and a 2nd light-receiving part when the light from a spot area | region has a nonuniformity. It is explanatory drawing explaining the light which injects into a 1st light-receiving part and a 2nd light-receiving part when the light from a spot area | region has directivity. It is a block diagram which shows the structure of the color measurement apparatus which concerns on this embodiment. 5 is a flowchart for explaining an operation of outputting a first measurement result in the color measurement device according to the present embodiment. 6 is a flowchart for explaining an operation of outputting a second measurement result in the color measurement device according to the present embodiment. 6 is a flowchart for explaining an operation of outputting a third measurement result in the color measurement device according to the present embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram illustrating the configuration of a measurement optical system 1 according to the present embodiment. The measuring optical system 1 is provided in a color measuring device. The measurement object of this color measuring device is, for example, a screen SC of a liquid crystal display. The color measuring device measures the color information of a part of the screen SC (hereinafter referred to as spot region SP), not the entire screen SC, and outputs the result. The color information is information indicating numerically the expression related to the color of the spot area SP. For example, chromaticity is color information. The measurement optical system 1 includes a first optical member 2, a light dividing unit 3, a first light receiving unit 4, an aperture stop 5, a second optical member 6, and a second light receiving unit 7.

  The first optical member 2 converges the light from the spot region SP. In other words, the first optical member 2 has a positive optical power. The optical power means refractive power (reciprocal of focal length).

  The light splitting unit 3 is a half mirror that reflects half of the light from the spot region SP that has passed through the first optical member 2 and transmits the remaining half. As described above, the light splitting unit 3 splits the light from the spot region SP that has passed through the first optical member 2 into two. The division ratio will be described as one-to-one, but is not limited to this. The light splitting unit 3 is not limited to a half mirror, and may be a beam splitter.

  By the two divisions, two rear focal points of the first optical member 2 can be formed. One is a rear focal point (hereinafter referred to as a first rear focal point fp <b> 1) located in the optical path of the light reflected by the light dividing unit 3 (one light divided into two). The other one is a rear focal point (hereinafter referred to as a second rear focal point fp2) located in the optical path of the light transmitted through the light dividing unit 3 (the other divided light).

  The first light receiving unit 4 is disposed at the position of the first rear focal point fp1. The light reflected by the light splitting unit 3 enters the first light receiving unit 4 and is received.

  An aperture stop 5, a second optical member 6, and a second light receiving unit 7 are disposed in the optical path of the light transmitted through the light dividing unit 3. The aperture stop 5 is disposed at the position of the second rear focal point fp2. Object-side telecentricity is realized by the first optical member 2 and the aperture stop 5.

  You may adjust the focal distance of the 1st optical member 2 so that the international standard requested | required of the color measuring apparatus provided with the optical system 1 for a measurement may be satisfy | filled. More specifically, according to the international standard for colorimeters (IEC 61747-6), when evaluating the screen SC of the liquid crystal display, the light from the screen SC is within ± 2.5 degrees with respect to the principal ray. It is prescribed to use. The focal length of the first optical member 2 is adjusted so that light from an angle exceeding plus or minus 2.5 degrees with respect to the principal ray can be blocked so as to satisfy this rule, The beam diameter may be matched with the diameter.

  Conversely, the diameter of the first light receiving unit 4 may be set in advance so as to satisfy the international standard for an arbitrary focal length of the optical member 2.

  Note that by adjusting the diameter of the aperture stop 5 on the transmission side, the angle of light can be regulated independently of the reflection side, so that the aperture stop can be measured so that a light beam having a desired angle with respect to the principal ray can be measured. The diameter of 5 may be set in advance.

  Further, the diameter of the aperture stop 5 may not be set in advance, and the operator of the color measuring device may be able to adjust the diameter of the aperture stop 5.

  The second optical member 6 converges the light that has passed through the aperture stop 5. The position of the front focal point of the second optical member 6 may or may not coincide with the position of the second rear focal point fp2. If these positions are matched, bilateral telecentricity is realized.

  The second light receiving unit 7 is disposed at a position where the light converged by the second optical member 6 forms an image (that is, a position where the light from the spot region SP forms an image). Of the light that has passed through the light splitting unit 3, the light that has passed through the aperture stop 5 is converged by the second optical member 6, enters the second light receiving unit 7, and is received.

  Note that the second optical member 6 may be omitted if the light from the spot region SP can be imaged by the second light receiving unit 7 by the first optical member 2. The first light receiving unit 4 is arranged on the transmission side of the light dividing unit 3, and the aperture stop 5, the second optical member 6 and the second light receiving unit 7 are arranged on the reflecting side of the light dividing unit 3. Also good.

  The first light receiving unit 4 will be described in detail with reference to FIGS. 1 and 2. FIG. 2 is a plan view of the first light receiving unit 4 as viewed from the light incident side. The light from the spot region SP incident on the first light receiving unit 4 is spot light L having a circular shape when viewed from the first light receiving unit 4 side. The first light receiving unit 4 includes three optical filters 11a, 11b, and 11c and three light receiving elements 12a, 12b, and 12c.

  The three optical filters 11a, 11b, and 11c are spectral filters that have different wavelength components to be transmitted and are equivalent to the color matching functions of the XYZ color system of the CIE (International Commission on Illumination). When the three optical filters 11a, 11b, and 11c are not distinguished, they are referred to as an optical filter 11. The optical filter 11 is not limited to the color matching function of the XYZ color system, and may be a spectral filter capable of performing desired spectroscopy. The number of optical filters 11 is not limited to three.

  The light from the spot region SP reflected by the light splitting unit 3 enters the respective light receiving surfaces 15 of the optical filters 11a, 11b, and 11c shown in FIG. In FIG. 1, for the sake of drawing, the light receiving surface 15 is shown separated from the optical filters 11a, 11b, and 11c.

  The three light receiving elements 12a, 12b, and 12c are, for example, photodiodes or phototransistors, and are elements that convert received light into electric signals. An optical filter 11a is disposed on the light receiving element 12a, and the light receiving element 12a receives light transmitted through the optical filter 11a. An optical filter 11b is disposed on the light receiving element 12b, and the light receiving element 12b receives light transmitted through the optical filter 11b. An optical filter 11c is disposed on the light receiving element 12c, and the light receiving element 12c receives light transmitted through the optical filter 11c. As described above, the three light receiving elements 12a, 12b, and 12c are provided corresponding to the three optical filters 11a, 11b, and 11c, respectively, and receive light transmitted through the corresponding optical filters. When the three light receiving elements 12a, 12b, and 12c are not distinguished, they are described as the light receiving element 12.

  Since the second light receiving unit 7 has the same configuration as that of the first light receiving unit 4, the same components are denoted by the same reference numerals and description thereof is omitted.

  According to the measurement optical system 1, even when the light from the spot region SP has unevenness (that is, when the amount of light from each point on the spot region SP is not uniform), the first light receiving unit 4 is provided. The light incident on the respective light receiving surfaces 15 of the optical filters 11a, 11b, and 11c is not uneven. This will be described with reference to FIGS. FIG. 3 is an explanatory diagram for explaining light incident on the first light receiving unit 4 and the second light receiving unit 7 when the light from the spot region SP has unevenness. The light L1 from the point P1 on the spot area SP indicates that the amount of light is larger than the light L2 from the point P2 on the spot area SP.

  Since the respective light receiving surfaces 15 of the optical filters 11a, 11b, and 11c provided in the first light receiving unit 4 are at the position of the first rear focal point fp1, each point (for example, the point P1, The light from the point P2) is uniformly distributed on the light receiving surface 15 thereof. For this reason, the amount of light incident on each point on the light receiving surface 15 is the same, and the light incident on the light receiving surface 15 is not uneven. Therefore, even when the light from the spot region SP has unevenness, it is possible to prevent variations in the amount of incident light on the three optical filters 11 provided in the first light receiving unit 4.

  Since the light receiving surfaces 15 of the optical filters 11a, 11b, and 11c provided in the second light receiving unit 7 are at positions where light from the spot region SP is imaged, each point on the spot region SP and their points Each point on the light receiving surface 15 has a one-to-one correspondence. For this reason, since the unevenness of the light from the spot area SP is transmitted to the light receiving surfaces 15 as they are, the amount of light incident on each point on the light receiving surfaces 15 varies. Therefore, when the light from the spot area SP has unevenness, the amount of incident light on the three optical filters 11 provided in the second light receiving unit 7 varies.

  As described above, when the light from the spot region SP has unevenness, the second light receiving unit 7 receives this influence, but the first light receiving unit 4 does not receive this influence. A color measurement device including the measurement optical system 1 can obtain a measurement result with high accuracy by calculating color information of the spot region SP using a signal output from the first light receiving unit 4.

  According to the measurement optical system 1, even when the light from the spot region SP has directivity, the light incident on the light receiving surfaces 15 of the optical filters 11a, 11b, and 11c provided in the second light receiving unit 7 is used. Does not cause unevenness. This will be described with reference to FIGS. FIG. 4 is an explanatory diagram for explaining light incident on the first light receiving unit 4 and the second light receiving unit 7 when the light from the spot region SP has directivity.

  That the light from the spot area SP has directivity means that the amount of light varies depending on the emission angle of the light from the spot area SP. In FIG. 4, the point P1 on the spot area SP and the point P2 on the spot area SP have the same light quantity, but the light quantity at the emission angle θ is larger than the light quantity at other emission angles. .

  The aperture stop 5 is disposed at the position of the second rear focal point fp2, and the second light receiving unit 7 is disposed at a position where the light from the spot region SP is imaged, and the other light divided in two. The light passing through the aperture stop 5 is received. As a result, an optical system that realizes object-side telecentricity is formed, and images by this optical system are formed on the respective light receiving surfaces 15 of the optical filters 11a, 11b, and 11c provided in the second light receiving unit 7. For this reason, the amount of light incident on each point on the light receiving surface 15 is the same, and the light incident on the light receiving surface 15 is not uneven. Therefore, even when the light from the spot region SP has directivity, it is possible to prevent variations in the amount of incident light on the three optical filters 11 provided in the second light receiving unit 7.

  On the other hand, each of the light receiving surfaces 15 of the optical filters 11a, 11b, and 11c provided in the first light receiving unit 4 is affected by the directivity of light from the spot region SP, and each point on the light receiving surface 15 is affected. Variations in the amount of light incident on the. Therefore, when the light from the spot region SP has directivity, the amount of incident light on the three optical filters 11 provided in the first light receiving unit 4 varies.

  As described above, when the light from the spot region SP has directivity, the first light receiving unit 4 receives this influence, but the second light receiving unit 7 does not receive this influence. A color measurement device including the measurement optical system 1 can obtain a measurement result with high accuracy by calculating the color information of the spot region SP using the signal output from the second light receiving unit 7.

  As described above, according to the measurement optical system 1, in the plurality of optical filters 11 included in each of the first light receiving unit 4 and the second light receiving unit 7 that receive light from the spot region SP, Without using such a light guide member, it is possible to prevent variations in the amount of light incident on these optical filters 11.

  Further, the number of optical filters 11 and light receiving elements 12 used in the measurement optical system 1 is not limited to three.

  FIG. 5 is a block diagram showing the configuration of the color measurement device 20 according to this embodiment. The color measuring device 20 includes the measuring optical system 1 shown in FIG. In FIG. 5, the components of the measurement optical system 1 other than the first light receiving unit 4 and the second light receiving unit 7 are omitted. In addition to the measurement optical system 1, the color measurement device 20 further includes a calculation control unit 21 and an operation unit 22.

  The calculation control unit 21 controls the operation of the color measurement device 20 and calculates color information. The arithmetic control unit 21 is a microcomputer realized by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. As functional blocks, the first calculation unit 23, the second calculation unit 23, and the like. A calculation unit 24 and a third calculation unit 25 are provided.

  The first calculation unit 23 calculates the chromaticity (an example of predetermined color information) of the spot area SP using the signal output from the first light receiving unit 4. The second calculation unit 24 calculates the chromaticity of the spot region SP using the signal output from the second light receiving unit 7. The third calculator 25 uses the chromaticity calculated by the first calculator 23 as the first measurement result, the chromaticity calculated by the second calculator 24 as the second measurement result, and the first The average of the measurement result and the second measurement result is calculated. The calculated average is the third measurement result.

  The operation unit 22 is a device for operating the color measurement device 20, and is realized by a touch panel, a keyboard, or the like, for example. As an operation of the color measurement device 20, before the operator performs color measurement using the color measurement device 20, any one of the first measurement result, the second measurement result, and the third measurement result is obtained. , There is a pre-selection operation.

  The operation unit 22 includes a display unit 26. The display unit 26 is a device that displays the measurement result selected by the operation unit 22, and is realized by a display device such as an LCD (liquid crystal display) or an organic EL display. The display unit 26 is an example of an output unit that outputs the measurement result selected by the operation unit 22. A printing unit that prints the measurement result selected on the operation unit 22 on a sheet can be used as the output unit.

  An operation of outputting the first measurement result in the color measurement device 20 according to the present embodiment will be described with reference to FIGS. 1, 5, and 6. FIG. FIG. 6 is a flowchart for explaining the operation. The color information is chromaticity. The output of the first measurement result is a display of the first measurement result. The operator of the color measurement device 20 operates the operation unit 22 to select the output of the first measurement result (step S1).

  An operator operates the operation unit 22 to instruct start of measurement. Thereby, the 1st calculation part 23 calculates the chromaticity of the light from the spot area | region SP using the signal output from the 1st light-receiving part 4 (step S2).

  The calculation control unit 21 causes the display unit 26 to display the chromaticity calculated in step S2 as the first measurement result.

  The first measurement result is calculated based on the signal output from the first light receiving unit 4 (step S2). As described with reference to FIG. 3, even when the light from the spot region SP has unevenness, it is possible to prevent variations in the amounts of incident light on the three optical filters 11 included in the first light receiving unit 4. . Therefore, even if the light from the spot area SP has unevenness, it is possible to prevent the measurement accuracy of chromaticity from being lowered. The operator of the color measurement device 20 selects the first measurement result when it is known in advance that the influence of unevenness is relatively large and the influence of directivity is relatively small for the light from the spot region SP.

  An operation of outputting the second measurement result in the color measurement device 20 according to the present embodiment will be described with reference to FIGS. FIG. 7 is a flowchart for explaining the operation. The color information is chromaticity. The output of the second measurement result is a display of the second measurement result. The operator of the color measurement device 20 operates the operation unit 22 to select the output of the second measurement result (step S11).

  An operator operates the operation unit 22 to instruct start of measurement. Thereby, the 2nd calculation part 24 calculates the chromaticity of the light from spot area SP using the signal output from the 2nd light-receiving part 7 (step S12).

  The calculation control unit 21 displays the chromaticity calculated in step S12 on the display unit 26 as the second measurement result (step S13).

  The second measurement result is calculated based on the signal output from the second light receiving unit 7 (step S12). As described with reference to FIG. 4, even when the light from the spot region SP has directivity, the amount of incident light on the three optical filters 11 included in the second light receiving unit 7 does not vary. it can. Therefore, even if the light from the spot region SP has directivity, it is possible to prevent the chromaticity measurement accuracy from being lowered. The operator of the color measuring device 20 selects the second measurement result when it is known in advance that the influence of directivity is relatively large and the influence of unevenness is relatively small for the light from the spot region SP.

  An operation of outputting the third measurement result in the color measurement device 20 according to the present embodiment will be described with reference to FIGS. 1, 5, and 8. FIG. FIG. 8 is a flowchart for explaining the operation. The color information is chromaticity. The output of the third measurement result is a display of the third measurement result. The operator of the color measurement device 20 operates the operation unit 22 to select the output of the third measurement result (step S21).

  The operator operates the operation unit 22 to input a weight for the first measurement result and a weight for the second measurement result (step S22). If these weights are the same, the third measurement result is a simple average of the first measurement result and the second measurement result. If these weights are different (for example, 2 to 1), the third measurement result is a weighted average of the first measurement result and the second measurement result.

  An operator operates the operation unit 22 to instruct start of measurement. Accordingly, the first calculation unit 23 calculates the chromaticity of the light from the spot region SP using the signal output from the first light receiving unit 4, and the second calculation unit 24 Using the signal output from the light receiving unit 7, the chromaticity of the light from the spot region SP is calculated (step S23).

  The third calculation unit 25 calculates an average value of the chromaticity calculated by the first calculation unit 23 and the chromaticity calculated by the second calculation unit 24 (step S24).

  The calculation control unit 21 displays the chromaticity calculated in step S24 on the display unit 26 as the third measurement result (step S25).

  The third measurement result is a measurement result obtained by averaging the first measurement result and the second measurement result. The average may be a simple average or a weighted average. The operator of the color measurement device 20 selects the third measurement result when it is known in advance that the influences of unevenness and directivity are large for the light from the spot region SP.

  As described above, according to the present embodiment, the light from the spot area SP has a relatively large unevenness and the directivity has a relatively small influence. When the influence is relatively large and the influence of unevenness is relatively small, and when the influences of unevenness and directivity are both large for the light from the spot area SP, it is possible to prevent the colorimetric accuracy from being lowered in any case. .

  A first modification of the present embodiment will be described. In the first modification, it is possible to select both outputs of the first measurement result and the second measurement result. That is, the operation unit 22 in FIG. 5 is one of the first measurement result, the second measurement result, the third measurement result, and the measurement results of both the first measurement result and the second measurement result. An operation for selecting one in advance is performed. When the operator of the color measurement device 20 wants to know both the first measurement result and the second measurement result, both measurement results are selected.

  A second modification of the present embodiment will be described. In the second modification, the output of three measurement results (all measurement results) of the first measurement result, the second measurement result, and the third measurement result can also be selected. 5 includes the first measurement result, the second measurement result, the third measurement result, the measurement results of both the first measurement result and the second measurement result, and the first measurement result. The operation of preselecting any one of the three measurement results of the measurement result, the second measurement result, and the third measurement result is performed. When the operator of the color measuring device 20 wants to know the three measurement results of the first measurement result, the second measurement result, and the third measurement result, the three measurement results are selected.

  In the present embodiment, the first modified example, and the second modified example, the measurement of the light source color (the screen SC of the liquid crystal display) has been described. In this case, an illumination light source that illuminates the measurement target is added.

1 optical system for measurement 2 first optical member (an example of an optical member)
3 Light splitting section 4 First light receiving section 5 Aperture stop 6 Second optical member 7 Second light receiving sections 11, 11a, 11b, 11c Optical filters 12, 12a, 12b, 12c Light receiving element 15 Light receiving surface 20 of optical filter Color measuring device SP Spot area SC LCD screen (an example of measurement target)
fp1 First rear focal point fp2 Second rear focal point P1, P2 Point L1 on the spot area Light L2 emitted from the point P1 Light L2 emitted from the point P2 Spot light incident on the light receiving surface

Claims (5)

An optical member for converging light from the measurement object;
A light splitting unit that splits the light that has passed through the optical member into two parts;
The rear focal point of the optical member, which is located in the optical path of the one of the two divided lights, is the first rear focal point, and is disposed at the position of the first rear focal point, and the one of the two divided parts. A first light receiving portion for receiving light;
An aperture stop located at the position of the second rear focal point, the rear focal point of the optical member being located in the optical path of the other light divided into two as the second rear focal point;
A second light receiving unit that is disposed at a position where the light from the measurement object forms an image, and that receives the light that has passed through the aperture stop among the other divided light;
The first light receiving unit and the second light receiving unit are:
A plurality of optical filters having different wavelength components to be transmitted;
A measuring optical system including a plurality of light receiving elements provided corresponding to each of the plurality of optical filters and receiving light transmitted through the corresponding optical filter.   A colorimetric apparatus comprising the measuring optical system according to claim 1. A first calculation unit that calculates predetermined color information of the measurement object using a signal output from the first light receiving unit;
A second calculation unit that calculates the predetermined color information of the measurement object using a signal output from the second light receiving unit;
The result calculated by the first calculator is the first measurement result, the result calculated by the second calculator is the second measurement result, and the first measurement result and the second measurement A third calculation unit for calculating an average of the results;
The result calculated by the third calculation unit is set as a third measurement result, and any one of the first measurement result, the second measurement result, and the third measurement result is selected in advance. An operation unit to be operated;
The color measurement device according to claim 2, further comprising: an output unit that outputs a measurement result selected by the operation unit.   The operation unit is one of the first measurement result, the second measurement result, the third measurement result, and the measurement results of both the first measurement result and the second measurement result. The colorimetric apparatus according to claim 3, wherein an operation for selecting one in advance is performed.   The operation unit includes the first measurement result, the second measurement result, the third measurement result, the measurement results of both the first measurement result and the second measurement result, and the first measurement result. The colorimetric apparatus according to claim 3, wherein an operation for selecting in advance one of the three measurement results of the first measurement result, the second measurement result, and the third measurement result is performed.

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