TW535004B - Measuring optical system and three-stimulation value photoelectric colorimeter provided therewith - Google Patents

Abstract

The object is to provide a measuring optical system capable of accurately measuring the optical characteristic of an object to be measured of strong directivity even in the case that light intensity is very weak. The measuring optical system is composed of: an objective lens 21 having positive power condensing only a light flux of an emission angle alpha or less out of the light flux emitted from the area AR to be measured; a fiber 241 having the incident face A of the light flux condensed with the objective lens 21 at a position separated substantially for only the focus distance (f) of the objective lens 21 from the image side main point PP of the objective lens 21 and emitted to light receiving sensors 252a, 252b, 252c by dividing the incident light flux into three light fluxes. A telecentric optical system is composed of the objective lens 21, the fiber 241, and the loss of a light guide amount is reduced by guiding the whole light flux condensed by the objective lens 21 to a light receiving sensor side by the fiber 241.

Description

535004 V. Description of the invention (1) Background of the Invention The invention relates to a tri-stimulus value type photoelectric colorimeter mainly used for measuring the display characteristics (color, redundancy, color difference, and other characteristics) of a color LCD, and particularly relates to its use in Optical system for measurement. Figure 12 shows an optical system suitable for a conventional tristimulus type photoelectric colorimeter. The optical system 1 0 0 shown in the figure is suitable for a non-contact portable colorimeter. The optical system 1 is used to measure tristimulus values (hereinafter referred to as the optical system 101 for measurement), and the measurement is performed to confirm the measurement. A single-lens reflection type optical system 102 (hereinafter referred to as a viewfinder optical system 102) used for the measurement area AR of an object 104 (for example, a liquid crystal panel or the like). The optical measurement system 1 〇1 includes a structure for condensing the light LF from the measured area AR of the measured object 1 04. For example, an objective lens L1 composed of a plano-convex lens is used to specify the measured object 1 〇4The field aperture S of the measured area AR, and the light beam condensed on the objective lens L1 is divided into three beams, which are respectively led to the light receiving sensors (photoelectric switching elements) D1, D2 of the light receiving device 103. Optical fiber FB of D3. In order to measure the luminous color of the measured object 104 by using three stimulus values (X, γ, Z), the beam receiving section 103 includes three beam receiving sensors D1, D2, and D3, and the light receiving sensors D1 to D1- The light receiving sensitivity of D3 is corrected to the spectral sensitivity correction filters FI, F2, and F3 of the standard measurer specified by the CIE (Commission Internationale de I'Eclairage; International Commission on Illumination), respectively. The light emitted from the measured area AR passes through

2014-4726-PF (N) .ptd Page 4 535004

The light is collected through the objective lens L1.

Evening μ & α% Dismiss Aperture position imaging. The incident surface of the optical fiber FB is set at the opening of the field of vision G3, and the aperture 3 is transmitted through the aperture 3 of the field of vision. The fiber FB is divided into two beams through the optical fiber FB, and is emitted from the optical fiber FB. Xi Xizhong accounted for Bazhifandaochengyi # τm The first beam emitted by PQ wear was corrected by the spectral sensitivity; considering Guang Guangzhai F 1, F 2, H shot into Zhong, Mr a & rd shot first received sensor D1, D2, D3, and then these light receiving sensors D1, D ?, m address eight i? 丨 ι_. Eighty seven + a also w ^ D3 are switched into electrical signals respectively. If the spectral sensitivity correction filter J ? 1, the filter characteristic of the clear umbrella M & π °° 为 is a color matching function [element (one κ λ)] for the red wavelength region, and the filter characteristic of the filter F2 is for the green wavelength region Color matching function with sensitivity [y (—) (long)], spectral filtering function of the spectral sensitivity correction filter is a color matching function with sensitivity to blue wavelengths [5 (~) (λ)], then receive from light The sensors D1, D2, and D3 output light-receiving signals corresponding to the three stimulus values (X, Y, Z). The system 102 is composed of a semi-transparent lens μ,! ^ 〇1 ^ 〇 type prism PR, a scale glass G with a measurement area mark, and an eyepiece L2. Part of the light transmitted through the objective lens li passes through the translucent The mirror M is guided to the Porro prism PR, and then passes through the scale glass g, and then enters the unillustrated window through the eyepiece L2. The light image incident on the translucent lens μ (light image of the measured area AR) passes through The translucent mirror μ was inverted and led to the Porro-type prism PR, but since the Poro-type prism ρK was inverted again, an upright light image entered the eyepiece L2, and the light image (both measured A standing orthographic image of the area) is projected into the window. Since the ruler glass G is arranged at a position that is equivalent to the light receiving sensors D 1 to D3, the surveyor can see the measured area with the measurement range mark through the window. A r

2014-4726-PF (N) .ptd Page 5 535004 V. Description of the invention (3) Light image. SUMMARY OF THE INVENTION As shown in FIG. 13, in an optical system suitable for a conventional three-stimulus-type photoelectric colorimeter, only a part of the light beam is incident on the light receiving sensor due to the light beam emitted from the radiation surface S0 of the optical fiber FB. This causes a problem that the light receiving amount of the light receiving sensor D decreases.

On the other hand, it is well known that liquid crystal panels have different brightness and chromaticity characteristics (light distribution characteristics) with the change of viewing angle (angle deviating from the normal of the center plane of the liquid crystal panel). As disclosed in Japanese Laid-Open Publication No. 2000- 2 2 1 1 009, it is necessary to use only a predetermined angle (a predetermined angle according to the light distribution characteristics of the liquid crystal panel) to direct the light beam receiving sensor to the center plane normal, As a result, the light beam emitted beyond the predetermined angle cannot enter the optical system for measurement of the light receiving sensor. If a colorimeter uses an optical system for measurement as described in the publication, as described below, with respect to the center plane normal of the liquid crystal panel, only a part of the light beam of a given angle enters the light receiving sensor, and the visible light receiving sensor The problem of reduced light reception remains.

Fig. 14 is a schematic diagram of the optical system for measurement shown in the above-mentioned bulletin, only the light beam emitted from the measured area of the object to be measured, which is smaller than the predetermined exit angle, is guided to the light receiving sensor. The measurement optical system shown in the figure has a single convergence function power), and the object-side principal point pp of the objective lens u with the focal length f is placed on the light receiving clothing 1 〇 The side is only away from the measured area ar focal length f position,

Page 6 535004

The focal point f of the image-side principal point pp (the points in FIG. 14 are approximately the same) is set so that the light-receiving surface RS is located only away from the objective lens [i In the example, the image-side principal point and the object-side main light-receiving device 103 are located. The measurement optical system, department, and system are so-called remote optical systems, and the light receiving device 103 itself functions as an aperture of the remote optical system. Therefore, from the light beams radiated from each part of the measured area AR, light beams having an emission angle smaller than α are incident on the light receiving sensors of the light receiving device. However, the optical system for this measurement, Since the light-receiving sensor D is set only at a distance from the focal point f of the image-side principal point pp of the objective lens L1, the radiation angle radiated from each part of the measured AR region AR of the liquid crystal panel 1 0 4 Among the light beams of 0 to α, only light beams with an emission angle of / 3 to α (light beams shown by diagonal lines in FIG. Η) are incident on the light-receiving sensor D, and light beams with an emission angle of 0 to points cannot enter the light-receiving sensor. The sensor D reduces the amount of light received by the light-receiving device. 〇〇3 The conventional optical system shown in Fig. 12 is suitable for a tristimulus type photoelectric colorimeter. In order to enable the surveyor to confirm the measured object, A framing optical system 102 is provided in the measured area AR of 1.04, and a part of the light beam transmitted through the objective lens 11 is guided to the framing optical system 102, so that the light receiving amount of the light receiving sensor d is further reduced. problem. In addition, when the above-mentioned light receiving amount is low, when the light beam radiated from the rigid area AR of the measured object 104 is weak (in the case of low brightness), it is impossible to ensure the smallest possible luminous flux for measurement (especially repeated measurement). The minimum luminous flux required at the time), resulting in

535004 V. Description of the Invention (5) Problem. #To the above-mentioned subject, the object of the present invention is to provide an optical system for measurement, which can accurately and accurately measure the light-emitting characteristics of a test object having a strong directivity even if the intensity of light is weak, and the third method includes the optical system. Stimulus value photoelectric color meter. The present invention is an optical system for measurement, which is characterized in that it has a convergence function (plus p0weo) for condensing only light beams radiated from a measured area of an object to be measured which have a small value = a predetermined radiation angle. And a light beam having an incident surface of a light beam condensed by the light condensing device at a position approximately equal to a focal distance of the light condensing device from a main point on the image side of the light condensing device and dividing the incident light beam into a plurality of light beams Dividing device: According to the optical system for measurement, the light beam radiated from the measured area of the measured object passes through the focusing device, so that only the light beam smaller than the predetermined radiation angle is focused on the incident surface of the beam splitting device, and then passes through this The beam splitting device is divided into a plurality of light beams to be emitted. Therefore, the light beam emitted from the measured area of the object to be measured can be guided to the light receiving sensor without causing a decrease in light flux ^. In the optical system for measurement, an alignment is also provided at a position which is approximately the focal length of the focusing device from the principal point on the shadow side of the focusing device. ,, ', ~ The lighting device that illuminates the entire measured area of the object to be measured. According to the measurement optical system, once the lighting device emits light, the light taking device and the beam splitting device constitute a remote optical system, and the lighting is: After the emitted light beam passes through the condensing device, it becomes a substantially parallel light ^ sunknife hits the measured area of the measured object. Therefore, the optical system for measurement a

2014-4726-PF (N) .ptd 535004 V. Description of the invention (6) When used in non-contact optical instruments, the surveyor can confirm the measured area by illuminating the measured area of the measured object. Because it is possible to confirm the area to be measured even if the Mimiao optical system is not used, there is no problem that the luminous flux that guides the light to the beam receiving sensor decreases due to the aiming optical system. Further, in the above-mentioned measuring optical system, a position where the distance from the main point on the image side of the light-condensing device to approximately the focal length of the light-condensing device is provided with a light-transmitting portion that transmits the light beam and a light-shielding portion that blocks the light beam. The light path switching device 'is disposed in the light-shielding section of the light path switching device. According to the optical system for measurement, the light beam collected by the light path switching device is incident on the light beam from the light condensing device to the light beam splitting device, and the light can be easily measured in the light-shielding state (for measurement Adjustment deviation from the correction value). Therefore, when the light path switching device is shielded and placed on the light path of the light beam, once the lighting device emits light, the correction value can be set in the measurement section. At the same time, the measurement of the measured object is performed during the measurement; J: With illumination, the surveyor can recognize the measured area of the measured object in the same area where the measurement deviates from the correction value. $ ~ Confirmation: In addition, the measurement optical system can be equipped with an i-th light-condensing device that has the function of converging (Plus p〇wer) only the light emitted from the area within the measured area is smaller than the predetermined radiation angle. The main point on the image side of the first focusing device of Hexingshui is larger than the distance μ, which is the first focusing point of the first focusing device, and splits the light beam transmitted through the opening aperture. Device, and set on the above page 9 2014-4726-PF (N) .ptd 535004 V. Description of the invention (7) and the above-mentioned beam splitting device, the opening aperture and the incident surface of the beam splitting device have a common Yoke (conn jugate), and condensing the light beam transmitted through the aperture stop in the second condensing device of the beam splitting device. According to this measurement optical system, the light beam emitted from the measured area of the object to be measured passes through the first condenser device and the aperture stop, and only the light beam smaller than the predetermined radiation angle is condensed on the first condenser device for imaging Position, the focused light beam is guided to the incident surface of the light beam splitting device through the second light collecting device, and is divided into a plurality of light beams by the light beam splitting device and emitted. Therefore, the optical system for measurement can also guide light beams smaller than a predetermined radiation angle out of the light beam emitted from the measured area of the measured object to the light beam receiving sensor without lowering the luminous flux. In the optical system for measurement, an illumination device for illuminating the entire measurement area of the object to be measured is provided near the entrance surface of the aperture stop or the beam splitting device. According to this measurement optical system, if the lighting device is installed near the aperture stop, once the lighting device emits light, the condenser device and the aperture stop constitute a remote optical system, and the light beam emitted by the lighting device passes through the first condenser device. Back 'becomes roughly parallel light to illuminate the measured area of the measured object. If the illuminating device is disposed near the incident surface of the beam splitting device, once the illuminating device emits light, the position of the opening aperture and the position of the incident surface of the beam splitting device have a conjugate relationship, and the remote optical system is the first 1 Condensing device and opening aperture, so the light beam emitted by the lighting device passes the second condensing device at the position of the opening aperture '_

2014-4726-PF (N) .ptd " " " Page 10 '" "-535004 V. Description of the invention (8)-Once the light is collected, it will be injected into the first light-condensing device, The object is irradiated to the area to be measured by the i-th light-concentrating device. Therefore, when it is applied to a non-contact optical instrument, the measurement area can be confirmed by illuminating the measurement area of the measurement object. Since the optical system is not used and can be measured one by one, the problem that the light flux of the light guide to the beam receiving sensor is low due to the framing optical system does not exist. Further, in the optical system for measurement, a light path switching device capable of switching a light transmitting portion that transmits a light beam and a light shielding portion that blocks the light beam is provided near the entrance surface of the aperture stop or the beam splitting device, and the lighting device is provided. It is arranged in a light shielding portion of the optical path switching device. According to the optical system used in this measurement, when the light-shielding part of the light path switching device is installed on the light path of the beam, once the lighting device emits light, the deviation correction value can be measured. At the same time, the measured area of the measured object can be measured during this measurement. Illumination, the surveyor can confirm that the measured object = measurement area when the measurement deviates from the correction value. " In addition, in the above-mentioned measuring optical system, the beam splitting and splitting has a plus power. In addition, the above-mentioned dividing unit ^ also divides the light beam into a plurality of light-guiding members, and corresponding to the light-guiding structure ^ is composed of a focusing member (P1US power) with a converging function provided on a plurality of radiating surfaces. Based on this measurement, the optical system is used to condense the light beam emitted from the measured area of the object under test. The light receiving area of the emitted light beam and the light receiving range of the light receiving sensor can be roughly obtained. Consistent, that is, the light guide loss between the salt-dry beam splitting device and the light receiving sensor. / Xiaoguang

535004 V. Description of the invention (9) In addition, the present invention is a three-stimulus-type photoelectric colorimeter, including the optical system for measurement, a light receiving device, and a calculation device, wherein the light receiving device has an optical system relative to the measurement. The plurality of light beam receiving sections provided on the plurality of radiation surfaces of the above-mentioned beam splitting device respectively separate the light beams emitted by the radiating surface of the helium into three color components of the primary colors, and perform photoelectric conversion to form an electrical signal output. The light receiving signals of the color components of the three primary colors output by the beam receiving unit are used to calculate a tristimulus value. In this tristimulus-type photoelectric colorimeter, among the light beams radiated from the measurement area of the object to be measured, light beams smaller than a predetermined radiation angle are divided into three beams by the optical system for measurement, and are respectively incident on the light receiving device. In each of the pre-receiving devices, the incident light beams are converted into electrical components of the three primary colors through photoelectric conversion, and the electrical signals are rotated out. In the calculation device, these electrical signals are used to calculate the tristimulus value. Because the light beam emitted from the measured area of the object to be measured is smaller than the predetermined radiation angle, all the light beams are guided to the light receiving device through the optical system for measurement, so the light loss of the light guide of the optical system for measurement is reduced. The amount of luminescence is small, and the second stimulus value can also be measured accurately. ~ Embodiments of the Invention Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view of the appearance of a tristimulus type photoelectric color meter according to an embodiment of the present invention. Tristimulus value photoelectric color meter 丨 (hereinafter referred to as color meter 丨)

535004 V. Description of the Invention (ίο) The probe 2 and the measuring instrument body 3 are composed. The measuring probe 2 and the measuring instrument body 3 are connected by a dedicated cable. The measurement probe 2 faces the display surface 5 of the liquid crystal panel 5 of the object to be measured, and is arranged at a predetermined distance d (for example, approximately 3 cm) from the display surface, and receives the output of the display surface 51 of the liquid crystal panel 5. The light is converted into an electric sign (analog signal) by photoelectric conversion, and is input to the measuring device body 3. The measurement probe 2 receives light from the liquid crystal panel 5 in a non-contact manner. Thus, as shown in Fig. ^, 1 the probe 2 can be fixed to the tripod 6, and when the height of the tripod is adjusted, the opposite position facing the liquid crystal panel 5 is adjusted at the same time, so as to achieve the desired The measurement area AR is set to face each other. After the light receiving signal from the measuring probe 2 is input, the measuring device main body 3 performs predetermined calculation processing, for example, calculates a tristimulus value (X, γ, Z), and Yxy (luminance, chromaticity) specified by CIE. Coordinate), τ (color difference from the relevant color temperature, blackbody trajectory, brightness), etc., and display the result of the calculation on the display panel 301. Fig. 2 is a block diagram showing the internal structure of the measurement probe 2 and the main body 3 of the measuring device. For example, the 'measuring probe 2 is provided with a measuring optical system and a light receiving system', where the 'measuring optical system includes an objective lens 2 (concentrating device) composed of a plano-convex lens and having a single converging function (plus power), and an optical path switching member 22 ( Optical path switching device), a driving member 23 that drives the optical path switching member 22, and a beam splitting member 2 4 (beam splitting device) that splits the light beam that has passed through the objective lens 21 into three beams (beam splitting device). The beam receiving system includes three standard observers. A beam receiving sensor having a spectral sensitivity characteristic, and each of the three light receiving members respectively photoelectrically converts the three beams emitted by the beam splitting member 24.

2〇14-4726-PF (N) .ptd

Page 13 535004 V. Description of the invention (11) Replace the photoelectric conversion unit 2 with an electric signal corresponding to the respective incident intensity and output it, and amplify the electric signal (voltage) output by each beam receiving sensor to a predetermined level The enlargement section 2 6. Fig. 3 is a schematic diagram showing a specific configuration of the measuring optical system and the photoelectric conversion section of the measuring probe 2. As shown in the figure, the beam splitting member 24 is composed of an optical fiber 241 bundled by a plurality of optical fiber bundles and three lenses 242a, 242b, and 242c having a converging function. In the optical fiber 2 41, the bundled plurality of optical fibers are divided into three bundles at the middle portion, that is, the bundled optical fiber has one beam incident surface and three beam exit surfaces B1, B2, and B3. In addition, the optical fiber 241 is arranged so that the incident surface a is located only from the image-side principal point PP of the objective lens 21 (for convenience of explanation, in this embodiment and the embodiments described later, only the image-side principal point and the object-side principal point are exemplified. When the points are substantially the same) is approximately the position of the focal length f of the objective lens 21. In other words, the objective lens 2 1 and the optical fiber 2 4 1 constitute a remote optical system. In addition, in this embodiment, the 'beam splitting member 24' uses an optical fiber, but other optical members such as a light pipe that perform the same function as an optical fiber may be used. According to this structure, if the measurement probe 2 is installed at a predetermined distance d (for example, about 3 cm) from the display surface 51 of the liquid crystal panel 5, only the light beam emitted from the measurement area AR of the liquid crystal panel 5 is only A light beam having a maximum radiation angle α (hereinafter referred to as a maximum radiation angle α) in a normal direction (direction parallel to the optical axis l) in the measured area AR is incident on the optical fiber 2 4 1 Incident surface. The maximum radiation angle α is determined based on the focal length f of the objective lens 21 and the diameter R of the incident surface a of the optical fiber 241. The incident light beam is divided into three beams in the optical fiber 2 4 1 and emitted from the radiation surfaces B1, B2, and B3, respectively.

2〇14-4726-PF (N) .ptd Page 14 535004 V. Description of the invention (12) Output 0 As shown in FIG. 4, the lens 242a focuses the light beam emitted from the radiation surface B1 of the optical fiber 2 41 to the light In the receiving sensor 252a, the irradiation range LA of the light beam is made to coincide with the light receiving range SA of the light receiving sensor 252a. Similarly, 'lens 2 42b, 242c focuses the light beams emitted from the radiation surfaces B2, B3 of the optical fiber 241 into the light receiving sensors 25 2b, 252c, respectively, so that the irradiation range of each light beam is corresponding to the corresponding light receiving sensor 252b. And 252c have the same light receiving range.

As a result, the light beam emitted from the optical fiber 241 is condensed in the light receiving range SA of the light receiving sensor 252, so the light beam entering the optical fiber 241 (radiated from the measurement area AR of the liquid crystal panel 5) All beams with a maximum radiation angle in the normal direction of the measured area AR less than ^) are incident on the light receiving sensors 252a, 252b, and 252c separately, so that the conventional optical system for measurement shown in FIG. 14 does not appear. The light receiving sensor ^ produces another phenomenon of low reception. The light path switching member 22 connects the light beam condensed by the objective lens 21 to the light ψ, f :, and switches the incident and light-shielding on the same day. In the light-shielded state, the second display Λ plane 51 is illuminated. The measured area AR can be confirmed visually.

Since there is no liquid crystal panel 5 (that is, no light is incident), the beam receiving portion 25 of the measurement optical system formed by the division member 24 is divided from the beam receiving portion 25 by =, 2 = = = 4 Erosion and sores; ^ I means “L shouting output” 隹 Under this shape, it makes it possible for the cover to shoot into the optical fiber 24 i to eliminate the above-mentioned noise 俨 _ bundle, but it can be said that the bluffing is positive (deviation Correction).

Page 15 535004 V. Description of the invention (13) Optical path switching member 2 2, optical fiber 2 4 1 祜 & person free Λ * +, M 1 The measurement value can be adjusted to 0 when the light is completely shielded, or it can be adjusted in the light-shielded state. The measured value is used in the harp. m as the deviation correction value§ has been remembered: as shown in Figure 5, the optical path switching member 22 can surround the central axis 22: a circular dish-like member, forming an existing inch of circular opening 223 at a predetermined distance from the center, and The light-emitting element 2 2 4 is not disposed on the surface facing the objective lens 21 (the optical surface of the optical fiber 24m) and the center axis 222 of the circular opening 223 is point-symmetrical. The size of the circular opening 223 is set such that when the incident surface of the circular opening “optical fiber 241 is faced, the light beam focused by the objective lens 21 does not disappear or darken in the optical path switching member 22 (πΐ丨), can be completely incident on the incident surface A. In addition, the light-emitting element 224 can use any light-emitting element such as LED, semiconductor laser, and lamp. The optical path switching member 22 is driven and rotated by a driving member 23 such as a motor. The circular opening 2 23 is set at a position (light guide position) opposite to the optical fiber. During the correction, as shown in FIG. 6, the light emitting element 224 is set at the position of the optical axis L of the objective lens 21 (incident with the optical fiber 241 Where the planes overlap, that is, the light-shielding position.) When the light path switching eye member 22 is provided in the light-shielding position, the light-emitting element 224 is set at a position approximately the same as that of the incident surface of the optical fiber 24ι. The purpose is to enable the surveyor to confirm during calibration. The measured area ar of the liquid plate 5. In other words, 'the light path switching member 22 is provided at the light-shielding position, which will cause the light emitting element 2/24 to emit light. As mentioned above, since the objective lens 2 and the optical fiber 241 ^ ^ Pass optical system, so that as shown in FIG 6, is incident from the optical fiber 241 disposed in the

535004

The light beams emitted from the light emitting elements 224 at the same position pass through the objects Η &% and ^ to form parallel light and irradiate the areas substantially the same as the display surface of the liquid crystal panel 5 and the vortex area AR. Therefore, the surveyor can check the illuminated area AR (illumination area) of the illuminated area of the display surface 51 of the crystal panel 5. In addition, in this embodiment, a driving source such as a motor is used to switch the optical path switching member 22, and a manual method may also be used. This makes it possible to reduce the size and weight of the measuring probe 2 because it is not necessary to install a driving source inside the measuring probe 2.

In this embodiment, the shape of the optical path switching member 22 is a disk shape, and is also a rectangular plate shape as shown in FIG. 7. Moreover, in this embodiment, the light-shielding position and the light-guiding position of the optical path switching member 22 are switched by rotation ', as shown in FIG. 7, and the switching may also be performed in a sliding manner (the sliding direction is arbitrary). -

In addition, in this embodiment, the optical path switching member 22 is provided inside the i-probe 2, but the optical path switching member 22 may be omitted. In this state, the surveyor can cover the top of the measurement probe 2 with a light-shielding member such as a sleeve to form a light-shielded state, and perform calibration in this state. On the other hand, in order to confirm the light-emitting element 2 2 4 of the measured area AR, it can be set as shown in FIG. 8 'that is, a flange portion 2 4 1 A is provided at the front end of the side A of the incident surface of the optical fiber 2 4 1 and passes through the optical fiber. 241 prevents the light beam from being blocked on the surface of the flange portion 241 A facing the objective lens 21. In this case, the light emitting element 224 may be one or plural. In the example of FIG. 8, two light-emitting elements 224 and 224 are provided, and the light emitted from each light-emitting element 2 2 4 and 2 2 4 ′ passes through the respective lights shown in the same figure.

2014-4726-PF (N) .ptd Page 17 Cut 004

The object F 21 is irradiated in a range substantially the same as the measured area AR of the display surface 51 of the liquid crystal panel 5. FIG. 9 is a schematic diagram of another embodiment of a measurement optical system. The optical system for measurement shown in the figure is a measurement system shown in FIG. 3, and a relay lens is provided at the position between the objective lens 21 (the first optical device) and the optical fiber 241. It is formed by 211 (second condensing device), an aperture stop si, and a wild light HS2. The iris aperture S1 is set at a position approximately at the focal length f from the main point pp of the image 21 of the objective lens 21, and the field of view aperture S2 is set at the imaging position of the objective lens 21. The relay lens 211 guides the light image formed on the field diaphragm S2 to the optical fiber 241, and is arranged at the opening aperture s 丨 and 165 to form a conjugated positional relationship between the opening aperture S1 and the position c of the incident surface a of the optical fiber 241 Between the optical fibers 241. The aperture stop S1 and the objective lens 21 constitute a remote optical system, and among the light beams emitted from the measurement area AR of the liquid crystal panel 5, a light beam smaller than the maximum radiation angle α enters the aperture stop S1. Moreover, since the maximum radiation angle α is determined by the focal length t of the objective lens 21 and the aperture diameter of the aperture stop s 丨, the opening of the aperture stop S1 can be adjusted according to the desired maximum radiation angle α and the focal length f of the objective lens 2 丨diameter. In this measurement optical system, only the light beams radiated from the measured area AR of the liquid crystal panel 5 that are smaller than the maximum radiation angle ^ can pass through the aperture stop S1 ′ and the light image of the measured area AR is in the field aperture S2 Location imaging. Thereafter, this light image is guided to the incident surface A of the optical fiber 241 through the relay lens 21 1. Since the opening aperture S1 and the incident surface A of the optical fiber 241 are arranged at positions having a conjugate relationship, the light beam passing through the opening aperture s 丨 can pass through the relay

2014-4726-PF (N) .ptd Page 18 535004 V. Description of the invention (16) 2—22 = to the incident surface A of the optical fiber 241 A 'Based on this measurement optical system :, Figure 3. The optical system is the same, and there is no angle. "The first beam king part is led to the beam receiving part 2 5 〇 Setting Π In this measurement optical system, the" home light path switching member 22 "is emitted and the light emitting element 224 emits light. The light emitting element 224 The first p L passes through the light path shown in FIG. 10 (the light path that is generally opposite to the light path from the liquid crystal panel 5 to the optical fiber-incident light) and is irradiated to the measured area AR that is substantially the same as the display surface 51 of the liquid crystal panel 5 In the area. Therefore, in the optical system, the surveyor can also confirm the measurement area AR of the liquid crystal panel 5 by the light of the light emitting element 224. In addition, in the optical system for measurement, since the aperture ㈣ and the incident surface of the light _ have a conjugated positional relationship, as shown by the dashed lines in FIG. 9 and FIG. J, a light-emitting element can be provided at the position of the aperture stop S1. 224. For example, a ring-shaped disc member is used to form an opening diaphragm temple, as in a structure similar to that shown in Figure 5: 叉 Fork switching member 22, 'an appropriate number can be set at an appropriate position on the surface of the disc member surface 10 The light-emitting element 2 2 4 ° As described above, since the aperture stop 31 and the objective lens 21 constitute remote light, first, the light emitted from the element 224 which is set at approximately the same position as the aperture stop S1 enters the objective lens. After 21, substantially parallel light is formed and goes to the display surface 51 (refer to the light path shown in FIG. 6) of the liquid crystal panel 5, thereby clarifying the measurement area ar of the liquid crystal panel 5. ... Returning to FIG. 3 again, the photoelectric conversion unit 25 has approximately the same beam connection 535004. 5. Description of the invention (π) receiving sensitivity, for example, three light receiving sensors 252a, 252b, and 252c composed of SPC and the like, and Each of the light-receiving sensors 252a, 252b, and 252c includes three spectroscopic sensitivity correction filters 2 5 1 a, 2 5 1 b, and 2 5 1 c, which are spectroscopic sensitivities of a standard measurer specified by CIE. The light receiving sensors 2 5 2 a, 2 5 2 b, and 2 5 2 c are respectively disposed on the optical axes of the lenses 242a, 242b, and 242c, and the light beams focused by the lenses 242a, 24 2b, and 242c are collected. The irradiated range is the light receiving range of the light receiving sensors 252a, 252b, and 252c. The spectral sensitivity correction filters 251a, 251b, and 251c are provided at appropriate positions between the light receiving sensors 252a, 252b, and 252c and the lenses 242a, 242b, and 242c, respectively. For example, the spectral sensitivity correction filter 2 5 1 a may have a filtering characteristic having sensitivity to a wavelength region of R (red). With this filtering characteristic, the light receiving sensitivity of the light receiving sensor 2 5 2 a is corrected to The light receiving sensitivity of the color matching function [cross (a) (again)] with high sensitivity to the red wavelength region. On the other hand, the spectral sensitivity correction filters 251b and 251c have filtering characteristics having sensitivity to the G (green) and B (blue) wavelength regions, respectively. Based on this filtering characteristic, the light receiving sensor 252b and the light receiving sensor The light-receiving sensitivity of the device 252c is corrected to the light-receiving sensitivity of the color matching function [y (—) (λ)] with high sensitivity for the green wavelength region, and the color-matching function [Shi (a ) (Λ)] light receiving sensitivity. Accordingly, the light receiving sensors 252a, 252b, and 252c can respectively output light receiving signals corresponding to three stimulus values (X γ z). ’’ Return to FIG. 2, the measuring instrument body 3 is provided with input from the measuring probe 2.

535004

The light receiving chemical number is converted into a digital signal (,,,,,,

... g Q 1 a / n hereinafter referred to as measurement data) A / D conversion unit 3 1. Save the measurement data output by A / D conversion unit 3 〖～ μ, times M ~ ρ / 1 Negative 枓 S ... 32. Use measurement data memorized in the data memory. For tristimulus values (X, Y, Z), γχγ (brightness, chromaticity coordinates), TAuvY (correlated color temperature, from blackbody locus) established by CIE Data processing unit 33 for performing calculations such as calculation, display unit 34 for display of calculation results by Cai Cai, operation unit 35 for inputting various data related to measurement (instructions for measurement, setting of display method, measurement range, etc.) And a control unit 36 that controls the operation of the measurement probe 2 and various operations inside the main body 3 of the measurement unit to control the measurement operation. The following describes the measurement process of the color meter 1 using the flowchart in Figure 丨 丨 for a brief description. In this measurement process, a case where the chromaticity of the liquid crystal panel (LCD) 5 as a measurement object is measured will be described. First, as shown in FIG. 1, the measurement probe 2 is positioned at a region to be measured in the liquid crystal panel 5 and at a distance of approximately a predetermined distance d (approximately several cm) from the display surface 5 of the liquid crystal panel 5 (step # 1 ). Thereafter, an image signal is sent to the liquid crystal panel 5 by a pattern generator (not shown), and a predetermined image for measurement is displayed on the display surface 51 of the liquid crystal panel 5 (step # 3). . Therefore, after the image used for measurement is displayed, three kinds of light receiving signals (analog signals) Sx, sy, and SZ related to the tristimulus values (X, Y, Z) are received from the light receiving sensors 252a, 252b, respectively. And 252c are output, and the light receiving signals SX, SY, and SZ are amplified to a predetermined level by the amplifying unit 26, and then input to the measuring instrument main body 3. Then, at the measuring device body 3, the light receiving signal

2014-4726-PF (N) .ptd Page 21 535004 V. Description of the invention (19) SX, SY, SZ are converted into digital signals DX, DY, DZ by the A / D conversion unit 31, and then stored in the data memory 3 2 (step # 5). Next, 'read the measurement data DX, DY, DZ from the data memory 32 and the calibration data κχ, KY, KZ memorized in advance, and send it to the data processing unit 33 to calculate the tristimulus values X, γ, z (step # 7). The three stimulus values X, γ, and z are calculated by X = κ × · DX, Y = KY · DY, and Z, KZ · DZ. Thus, the true values of the tristimulus values X, γ, and Z are calculated, and the calculation results are displayed on the display unit 34 (i.e., step # 9 of the display panel 301). In addition, in the above-mentioned embodiment, the red filter 2 5 丨 a and the green filter 2 5 丨 which correspond to the three kinds of spectral sensitivities prescribed by the spectral sensitivity of the International Commission for Illumination (CI Ε) as a standard measurer are adopted. b, and the blue filter 251c 'corrects the spectral sensitivity of the light receiving sensors 252 to 25 2c', but the type of the filter is not limited to this. As described above, since a light focusing device having a focusing power and a light beam splitting device having an incident surface at a position approximately equal to the focal distance of the light focusing device from the main point on the image side of the light focusing device constitute an optical system for measurement, Of the light beams emitted from the measured area of the measured object, the light beams smaller than the predetermined radiation angle can be all guided to the light receiving sensor through the beam splitting device without loss. Even if the luminous intensity of the measured object is small, it can be accurately measured Optical characteristics of the measured object. In addition, since the first focusing device having a focusing function (plus power) and the main point on the image side of the first focusing device are approximately the opening aperture set at the focal distance position of the first focusing device, the transmission will pass through. A beam splitting device for splitting the light beam of the aperture stop into a plurality of light beams and emitting the light beam;

2014-4726-PF (N) .ptd

Page 22 535004 V. Description of the invention (20) '—The position where the aperture and the incident surface of the beam splitting device have a common vehicle relationship. 丨 Erxia, Asia will converge the light beam passing through the opening aperture on the first of the above beam splitting device. The device is composed of a measuring optical system, so that the light beam emitted by the measured object within the Ih £ area less than a predetermined radiation angle can be all led to the light receiving sensor through the beam splitter 彳 f Device without loss, so as to obtain the same effect as i ^ s. Also, because an illuminating device is provided near the incident surface of the beam splitting device or near the aperture stop, and the illuminating device is used to illuminate the entire measurement area of the measured object, there is no need for a framing optical system, thereby avoiding Setting the framing optical system causes a problem in that the light guiding luminous flux of the light receiving sensor is low. In addition, because the beam splitting device has a converging function (plus power), if the irradiation range of the light beam emitted by the beam splitting device is substantially consistent with the light receiving range of the light receiving sensor, the beam splitting device and the light receiving induction can be reduced. Light guide loss between devices. This also prevents the light receiving amount of the light receiving sensor from being reduced. In addition, 'the three-stimulus-type photoelectric colorimeter is constituted by using the above-mentioned measuring optical system', and the light beam emitted from the measured area of the object to be measured can be smaller than that of the light beam with a fixed angle of radiation. ^ Sensor without any loss of luminous flux, even if the beam from the measured area of the measured object is small, the tristimulus value can be measured accurately and accurately.

535004 Round simple instructions

Fig. 1 is a perspective view showing the appearance of a real color meter according to the present invention. Figure 2 shows the measurement probe and the map. Block diagram of the internal structure of the main body of the three-stimulus-type photoelectric colorimeter. Figure 3 is a schematic diagram of the specific structure of the optical system for measuring the probe. 4 is emitted from the optical fiber. The relationship between the lighting range of the first beam and the first receiving range of the light receiving device. Fig. 5 is a structural sound diagram of an optical path switching member. Figure 6 shows shredding through the optical path

^. 0S u, the light emitting element of the switching element, the measured area

Schematic diagram of the situation in which the field is illuminated. 1T Figure 7 is a schematic diagram of the structure of a complex light path switching member. FIG. 8 is a schematic diagram of the structure of the light-emitting element of FSI 0 & = A schematic view of another embodiment of the optical system. "Sun" !: Measurement of the surroundings: the intention of using the light-emitting element in other embodiments of the optical system is not intended. Figure 11 is a flowchart illustrating the measurement processing procedure.-Figure 1 and 2 are applicable to the previous three stimulus values. The intent of the optical system of the type photoelectric colorimeter.

Fig. I # is a diagram showing the relationship between the illumination range of a light beam radiated from an optical fiber and the light receiving range of a beam receiving unit in a conventional measurement optical system. Fig. 14 is a schematic diagram of an optical system for measuring a light receiving sensor which used to guide light beams smaller than a predetermined radiation angle out of a light beam emitted from a measured area of a measured object.

535004 Brief description of the diagrams Symbol description 1 Tristimulus photoelectric color meter 2 Measuring probe 21 Objective lens (condensing device, first condensing device) 211 Relay lens (second condensing device) 2 2 Optical path switching member (optical path Switching device) 224 light-emitting element (lighting device) 2 3 driving member 24 beam splitting member (beam splitting device)

241 Optical fiber 242a, 242b, 242c Positive lens 25 Photoelectric conversion section 251a, 251b, 251c Spectral sensitivity correction filter 252a, 2 52b, 252c Light receiving sensor (light receiving device) 2 6 Amplifying section 3 Measuring device body 31 A / D conversion unit 32 data memory 33 data processing unit (calculation device)

34 Display section 35 Operation section 3 6 Control section

2014-4726-PF (N) .ptd Page 25

Claims (1)

535004 Case No. 91105187 6. Scope of patent application 1 · An optical system for measurement, including: Concentrating device, which has the function of condensing only the light beam of the measured object that is smaller than the predetermined radiation angle :: body ;: Μ repair gas is a beam splitting device. The incident surface of the light beam condensed by the above-mentioned condensing device is set at a position approximately equal to the focal length of the condensing device from the main point on the image side of the above-mentioned condensing device, and the incident light is divided A plurality of light beams are emitted. Λ 2 If the optical system for measurement according to item 1 of the scope of patent application includes: Illumination I, set at a large distance from the main point of the image side of the above-mentioned condensing device The position of the focal length of the condensing device is used to illuminate the entire measured area of the object. 3. If the optical system for measurement according to item 2 of the patent application scope further includes: | an optical path switching device, which is located at a position approximately from the main point I of the image side of the light condensing device to the focal length of the light condensing device, and has a light beam transmission The transmission part I and the light shielding part for blocking the light beam can be used to switch between the light transmission and the light blocking; among them, the above-mentioned lighting device is arranged in the light shielding part of the light path switching device. 4. An optical system for measurement, comprising: a first condensing device 'having a function of condensing only a light beam radiated from a measured area of an object to be measured that is smaller than a predetermined radiation angle; an aperture stop is set at a distance The image-side principal point of the first light-condensing device is roughly the position of the focal length of the first light-concentrating device; 535004 A 91105187 Sixth, the scope of the patent application for the beam splitting device 'separate the plurality of beams transmitted through the Shangcheng 卩 卩 ϊ; and < The beam up to the opening aperture is divided into the 詈 Hr optical clothing' 5 and placed. At the opening aperture and the above beam The incident surface of the splitting beam opening beam and the beam splitting device has the above-mentioned beam splitting device. The beam of the first circle of the upper back opening is condensed as follows: 5. If the optical system for measurement in item 4 of the patent application scope also includes a lighting device, it is set at the position near the opening # = above to the entire measured object. Measured: 6. If the optical system for measurement of item 5 of the scope of the patent application, it is also packaged and placed in the above-mentioned aperture stop or the above-mentioned beam splitter, and the position of the light beam, with a position to allow the beam to pass through. The light-shielding part can cut the transmission of the light beam and cut off the light beam. Among them, the above-mentioned lighting device is installed in the above-mentioned light path, and the shading technology of the device is as follows: range 2, 2, 3, 4, 5, ... 8 such as: "" The split device has a convergence function. 辻 异 克 八宝 丨: Patent The optical system for measurement of item 7 of Qianwei has a converging function provided in the upper middle of the light guide member corresponding to the above-mentioned light guide member, which is cut into a plurality of numbers, and the radiation surface of the number of chips 535004 — case number 91105187 Sixth, the patent application scope (plus power) of the light-concentrating member. 9 · A two-stimulus type photoelectric color meter, including: the optical system for summer measurement described in item 1 of the scope of patent application; the light receiving device 'has a complex radiation surface with respect to the above-mentioned beam splitting device of the optical system for measurement The separately provided plural beam receiving sections 'separate the beam emitted from the radiation surface into three color components of the three primary colors' and perform photoelectric conversion to form an electric signal output; and a calculation device based on the rotation from the above-mentioned beam receiving unit The light receiving signals of the color components of the three primary colors are used to calculate a tristimulus value. 2014-4726-PFl (N) .ptc Page 28