TW580569B - Optical measurement device - Google Patents

Abstract

The object is to provide an optical measurement device for increasing the precision of the measured value of the sensed light quantity from the emitted surface by inhibiting the non-uniformity of the emitted light quantity from plural emitted surfaces even under the situation that the optical distribution characteristic of the object to be measured is asymmetric. To achieve the object, the optical measurement device comprises the fiber bundle 22 on the plural emitted surfaces to split the light incident into the incident surface A from the measured object. The structure of incident surface A is divided into plural incident regions A11 to A32, and each emitted surface emits light onto plural different incident regions A11 to A32 which are not adjacent.

Description

580569 Case No. 91135055 Amendment V. Description of the Invention (1) [Technical Field to which the Invention belongs] The present invention relates to a light branch including a plurality of light exit surfaces including a light exit from a measured object that is incident on an incident surface. Optical device for measuring. The present invention is applied to, for example, a tristimulus type photoelectric colorimeter for measuring or adjusting display characteristics (colorimetric, brightness, color difference, etc.) of a liquid crystal panel or the like. [Prior Art] A conventional optical device for measurement is described with reference to FIG. 3 showing an embodiment of the present invention. In Fig. 3, the optical device includes an objective lens 21, a beam fiber 22, and a photoelectric conversion section 23. The objective lens 21 is disposed so as to face the measurement area AR of the measurement object Q, and focuses the light beams from the measurement area AR to the incident surface A of the optical fiber 22. The bundle optical fiber 22 is formed by bundling a plurality of optical fiber prime wires, and has one incident surface A and three exit surfaces B1, B2, and B3. The light beam incident on the incident surface A is branched into three light beams and then emitted from the three emission surfaces Bl, B2, and B3. The bundle optical fiber 22 is arranged so that the incident surface A is located at a distance substantially equal to the focal point f of the image side of the objective lens 21 and its focal length f. With this arrangement, only the light beams having an exit angle α or less out of the light emitted from the measurement area AR enter the incident surface A. The magnitude of the exit angle α is determined based on the focal length f of the objective lens 21 and the diameter D of the beam fiber 22. Generally, the emission angle α is set to about 2.5 degrees or less. The photoelectric conversion unit 23 is composed of three spectral sensitivity compensation filters 231a, 231b, 231c, and three photosensitive sensors 232a, 232b, and 232c, which are arranged corresponding to the three emission surfaces Bl, B2, and B3, respectively. Photosensitive sensors 232a ~ c

2201-5287-PFl (Nl) .ptc Page 4 580569 __Case No. 91135055_year month__ * V. Description of the invention (2) The spectral sensitivity compensation filter 23 la ~ c has a close color matching function. The spectral sensitivity accepts the light beams emitted from the emission surfaces B1 to B3, respectively. Therefore, an electric signal for decomposing the light beam incident on the incident surface A into the color components of the three primary colors is output from the photoelectric conversion section 23. According to the electrical signal, the three stimulus values of the measured object Q are calculated.

As shown in FIG. 11, in the past, the incident surface A of the bundle optical fiber 2 was divided into three fan-shaped incident areas A j 1, A j 2, and A j 3 with a center angle of 120 degrees and an area equal to each other. . The light beam incident on the incident area A j 1 is guided to the exit surface B 丨 and then emitted, and the light beam incident on the incident area A j 2 is guided to the exit surface b 2 and emitted, and the light beam incident on the incident area A j3 is guided to the exit surface B3 Shoot out. [Summary of the Invention] Problems to be Solved by the Invention In the past, the incident surface A of the bundled optical fiber 22 was divided into only three incident areas Ajb3. According to the light distribution characteristics of the measured object Q, the incident areas Ajl ~ Unevenness in light sensitivity (fluctuation in illumination) occurs between three. Therefore, when the relationship between the rotation angle position of the incident surface A and the measured object Q is changed, as a result of the change in the light sensitivity of the light-sensitive sensors 232a to C, there are three changes in the stimulus value obtained in the measured value. Problem.

That is, for example, as shown in FIG. 6, a light beam KSa having a circular cross-section from the measurement area ar to the incident surface A is considered. The beam of the light weave: of the half of the light beam (the part indicated by the oblique line in FIG. 6) is incident into the lower half of the part ′ (the part without the oblique line in FIG. 6) is entered into the half. This is no problem with the light distribution characteristics of "by", but the light distribution characteristics are different:

2201-5287-PFI (NI) .r: c $ 5 pages 580569 case number 91135055

V. Description of the invention (3), y c i

That is, as shown in FIG. 7, the light beam K emitted from the measurement object Q

In the case where the light beam coming from above the λ emission surface A is larger than the light beam coming down, the upper half becomes brighter and the lower half becomes darker. As a result, 3 incidents

The light quantity of Ajl ~ 3 is uneven. Therefore, when the relationship between the rotation angle spread τ of the incident surface A and the measured object Q is changed, the sensitivity of the same feeling is particularly changed from ^ §232a to c.

For example, in the case of the rotation angle position shown in FIG. 11, the sensitivity of the upper shot area A j 1 is the most, but the rotation angle and position of the beam fiber 22 are changed by 180 degrees. When the incident area A jl comes to the bottom, The amount of light exposure becomes minimal. Therefore, in the past, the three stimulus values obtained from the measured values according to the configuration of the object to be measured Q and the optical device changed, and there was a problem of measurement errors. In the case of liquid crystal panels, it is often seen that the light distribution characteristics are asymmetrical up and down. When measuring the optical characteristics of liquid crystal displays, it is a question of the present invention. In view of the above problems, the purpose of the present invention is to provide-using optical devices, measuring The asymmetrical measurement of the light distribution characteristics of the test object suppresses the unevenness of the amount of light emitted from the complex emission surface, so that the accuracy of the measurement value measured according to the sensitivity of the surface is improved. A self-projection

The optical device for measurement according to the present invention includes: a plurality of emitting surfaces that are emitted after the light from the object to be measured is diverged: the emitting surface J 'structurally divides the incident surface into a plurality of incident areas, = Qi Dun "Shot = Surface Shooting. The non-adjacent ones that are different from each other are best. The measuring optical device includes

580569 __91135055--year, month and year_ amendment ___ 5. The light concentrating device of the invention description (4), the light branching device is configured such that the incident surface is located away from the main point of the image side of the light concentrating device and its focal length is approximately equal The location of the distance. Alternatively, the measuring optical device includes: a first focusing device that focuses light from the object to be measured; an aperture stop that is disposed behind the first focusing device; and a second focusing device that passes through The light divergence device is disposed at a position where the incident surface and the aperture stop become a conjugate relationship with respect to the second condenser device.

Also, the plurality of incident areas corresponding to the respective exit surfaces are located at positions symmetrical to each other with respect to the center point of the incident surface. Alternatively, each of the plurality of incident areas corresponding to the respective exit surfaces is located at a random position on the incident surface. In addition, the structure includes a light-receiving device, which is disposed opposite to the respective emitting surfaces of the light divergence device, and decomposes light incident on the incident surface into colors and converts the light into electrical signals. The electrical signal output by the device calculates the tristimulus value. The present invention can be applied to various optical devices or measuring devices such as a colorimeter. For example, in the case of a tristimulus type photoelectric colorimeter, the structure may include the following components. The optical divergence device has a structure that diverges the light from the measured object that is incident on the incident surface and emits it. The multiple exit surfaces are divided into multiple incident areas, and the respective incident surfaces are emitted from the respective incident surfaces into non-adjacent plural incident areas that are different from each other; the light-sensing device has its own The plurality of sensing units arranged opposite to the exit surface, decompose the light incident on the incident surface into three color components of the primary color, and change the gas signal; and a computing device according to the electrical output from the photosensitive device.

2201-5287-ΡΠ (Ν1) .ρ ;: Page 7 580569 _ Case No. 91135055_ Year Month Day _ Modification _ _ V. Description of the invention (5) calculates the tristimulus value. [Embodiment] Fig. 1 is a perspective view showing the appearance of a tristimulus value photoelectric colorimeter 1 according to an embodiment of the present invention. Fig. 2 is a block diagram showing a functional structure of the tristimulus value photoelectric colorimeter 1. Fig. 3 is a diagram showing the structure of the optical system KK1 of the measuring head 2, and Fig. 4 is a diagram showing the situation of the incident area divided by the incident surface A of the bundle fiber 22. Fig. 5 is another example of the divided incident area Figure 'Figure 6 shows the path from the measured object to the incident surface,

Fig. 7 is a diagram showing an example of a case where the light distribution characteristic of the measured object is asymmetric. In this embodiment, an example of optical characteristics of a liquid crystal panel of a measurement object Q using a non-contact measurement system using a tristimulus photoelectric photoelectric colorimeter (hereinafter referred to as "colorimeter 1") will be described. In addition, since FIG. 3, FIG. 6, and FIG. 7 are the same as those described in the prior art, the description is omitted or simplified here. In FIG. 1, the colorimeter 1 is composed of a measuring head 2, a measuring body 3, an electric wire 4 connecting these elements, and a tripod 6 supporting the measuring head 2.

The measuring head 2 uses a tripod 6 to adjust the height so that the distance is only a predetermined distance d from the display surface HG of the liquid crystal panel which is the object to be measured Q, and is arranged to face the desired measurement area AR. The distance d is, for example, about 3cnl. The measuring head 2 receives the light from the measurement area AR of the display surface HG, converts it into an analog electrical signal, and inputs it into the measuring device body 3. —The measuring body 3 converts the electrical signal input from the measuring head 2 into a digital lean material (hereinafter referred to as "measurement data"), and performs predetermined calculation processing ′ to display the result on the display panel. For example, use arithmetic processing to calculate the country

580569 _Case No. 91135055 _Year Month $ 正 __ V. Description of the Invention (6) Three stimulus values (X, γ, z), xyY (chromaticity coordinates, brightness), T formulated by the International Lighting Commission (CIE) Au vY (correlated color temperature, color difference from black body track, brightness), etc. In FIGS. 2 and 3, the measuring head 2 is composed of a measuring optical system KK1 including an objective lens 21 and a beam optical fiber 22, and a photosensitive 糸 J Κ1 composed of a photoelectric conversion unit 23 and an amplification unit 24.

The photoelectric conversion unit 23 includes three photosensitive sensors 232a to c composed of three spectral sensitivity compensation filters 23a to c and a tandem converter (SPC), etc., and the photosensitive sensors 232a to c are each disposed in the system. The positions of the planes B1, B2, and B3 on the central axis of the beams and the beams emitted from the emitting planes and B2 and B3 are well received. The photosensitivity compensation filters 2 3 1 a to c are respectively disposed at appropriate positions between the photoreceptors 232 a to c and the emission surfaces B1, B2, and B3. The spectral sensitivity compensation filter 2 3 1 a has, for example, a filter characteristic having sensitivity in a wavelength region of red light (r). Using this filter characteristic, the photo sensor 232a is compensated to the photosensitivity of a color matching function (X · person) having a large sensitivity in the wavelength region of red light. And other spectrum

The sensitivity compensation filters 231b and 231c each have a filter characteristic having sensitivity in a wavelength region of green light (G) or blue light (B), and the photo sensor is 2 3 2 b is compensated by using this filter characteristic. The wavelength range of green light has a large sensitivity, and the photosensitivity of the color matching function (Y.bar · λ) compensates the photosensitivity 232c to a color matching function (Z · bar) with a large sensitivity in the blue light wavelength region. · Λ). Therefore, the self-sensing I5 2 32a ~ c outputs an electrical signal (photosensitive) corresponding to three stimulus values (χ, γ, ζ).

1 580569 _Case No. 91135055_ Year Month _ V. Description of the Invention (7) The amplifying section 24 amplifies the electrical signal output from the photoelectric conversion section 23 to a predetermined level. In FIG. 3, the bundle optical fiber 22 is divided into three at the middle portion in the axial direction, and the light beams incident on the incident surface A are separately emitted to the three exit surfaces B1, B2, and B3. As shown in FIG. 4, the incident surface A of the bundle optical fiber 22 is divided into six fan-shaped incident areas A1 1, A1 2, A21, A22, A31, and A32 with a central angle of 60 degrees and areas equal to each other. From FIG. 4, it is known that the 'incident regions All and A12, the incident regions A21 and A22, and the incident regions A31 and A32 are located at positions symmetrical with respect to the point centered on the light cart. Into these two incident areas at point-symmetrical positions

Beams of the domain are emitted from the same exit surface. That is, the light beams entering the incident area A " and ai2 are directed to the exit surface B1, the light beams entering the incident area A2i and the person 22 are directed to the exit surface B2, and the light beams entering the incident areas A3 1 and A32 are directed to the exit surface B 3 〇Then, the light beams that enter the non-adjacent and different plural incident areas of the incident surface A are guided to the exit surfaces Bl, β2, and B3, and those beams are added out from the exit surfaces Bl, B2, and B3. Therefore, the light beam incident on the incident surface A has unevenness in the incident surface a. The unevenness is also averaged by adding the light beams incident on the two incident areas located away from each other, and the light is emitted from each of the emission surfaces Bl, B2, and B3. A light beam with reduced unevenness is emitted.

In particular, as shown in FIG. 4, in the case where two incident areas located on the opposite side of each other with respect to the center of the incident surface A correspond to one outgoing surface, as shown, the light distribution characteristic of the measurement object Q is In the case of up and down asymmetry, the light asymmetry of the light distribution characteristics is cancelled by adding the light sensitivity of the two incident areas, and light is emitted from each exit surface regardless of the position of the rotation angle of the optical fiber 22

580569 _ Case No. 91135055 _ year and month said 佟 heart _; 5. Description of the invention (8) Light beams of approximately the same amount. Therefore, the electrical signals output by the photosensitive sensors 232a to c of the photoelectric conversion section 23 are not affected by the asymmetry of the light distribution characteristics of the object to be measured Q, and therefore, the accuracy of the measurement value can be improved. In addition, in FIG. 4, each of the incident areas A11 to A 3 2 has a fan shape surrounded by a straight line and an arc. However, in fact, each of the incident areas is formed by using end faces of a plurality of optical fiber prime lines, so the boundaries of the incident areas may not be beautiful straight lines. And arc. For example, the incident areas adjacent to each other at the boundary may invade each other. In the above-mentioned embodiment, “the two incident areas located at the point-symmetrical positions correspond to one exit surface”, but as shown in FIG. 5 (A), It is also possible to correspond four incident areas and one exit surface located at positions symmetrical at points divided by a central angle every 30 degrees. That is, in FIG. 5 (A), the four incident areas An, A12, A13, and A14 correspond to the exit surface B1, and the four incident areas A21, eight 22, A2 3, and A24 correspond to the exit surface B2. The incident area A3, a32, A33, A34, and the exit surface B3 may correspond to each other. Yuxian, you y, can

It is also possible to correspond to 2 · η (η integers) incident areas and one exit plane. In addition, it is also possible to correspond to plural entrance planes that are not in point-symmetrical positions. For example, let the smooth car be centered on L times and one:

η (η is an integer of 3 or more) personal shooting area and one shooting position: the second is not in a point-symmetrical position but will be. Multiple incident areas at homogenizable locations: i

Fans with several incident areas and one exit surface correspondingly arranged in the incident area J

580569 _Case No. 91135055 _Year Month: You π: ___ V. Description of the Invention (9) When the number is sufficiently large, the fiber primes become randomly divided randomly (random division). In these cases, it is preferable that the total areas of the incident areas corresponding to the respective exit surfaces are the same as each other. In addition, in the example shown in FIG. 5 (B), the end faces of the respective optical fibers constituting the bundle optical fiber 22 are an incident area, and those optical fibers are randomly assembled to be aggregated on one of the three exit surfaces B. In FIG. 5 (B), the multiple incident areas A11, A12, A13, ... correspond to one exit surface B1, and the same incident areas A21, A2 2, A23, ... correspond to one exit surface B2, and the incident areas A31, A3 2, A33, ... corresponds to an exit surface B3. These incident areas A1,

A1 2, A1 3, ... are randomly arranged on the incident surface a. The incident areas mi, A22, A23, ... and the incident areas A31, A32, A33, ... are similarly arranged on the incident surface A, respectively. In this embodiment, an optical fiber is used for the optical branching device, but another optical member having the same function as a light pipe or the like may be used. Returning to FIG. 2 ′, the measuring instrument body 3 is composed of an A / D conversion section 31, a data record recovery 32, a data processing section 33, a display section 34, and an operation input 36. The long-time control unit A / D conversion unit 31 receives electrical signals sx,

Converted into digital measurement data Dx, DY, Dz. The data memory 32 stores the measurement data ^, DY, Dz, and correction data from ky, κζ, and other data output by the Z A / D conversion unit 31. The data processing unit 33 calculates tristimulus values, xyY, ΔΔννΥ, etc. using the measurement data memorized in the data record 怆.粒粒 U For example, using the correction data KK, κγ, κζ to calculate according to the formula: Values X, Υ, 7. ^ —Assassination

580569

_ Case number 91135055 V. Description of the invention (10)

X = KX · DX Y = ΚΥ · DY

The Z = KZ · DZ display section 34 displays the calculation result pa, and inputs various measurement information regarding the measurement. The input section 35 is operated by the user, the measurement range, etc.). Control of two fingers *, display mode setting 3 actions of each part in the main body 3 of the measuring device ^ = control of the operation of the measuring head 2 and secondly, the measuring operation of the colorimeter i will be described using the flowchart of FIG. 8.

Fig. 8 'First, as shown in Fig. I', the measuring head 2 is set to face the broken measuring area AR (#U) of the liquid crystal panel which is the object Q to be measured. An image signal is transmitted from the unillustrated pattern generator to the liquid crystal panel, and the predetermined measurement image (# 丨 2) is displayed on the display surface HG of the liquid crystal panel. When an image for measurement is not displayed, three photosensitive signals SX, SY, and SZ regarding the three stimulus values are output from each of the photosensitive sensors 2 3 2 a to c. After the photosensitive signal is amplified to a predetermined level by the magnifying section 24, it is input to the measuring unit body 3. In the measuring instrument body 3, the A / D conversion section 31 converts the light-sensitive signals into measurement data DX, DY, and DZ, and stores them in the data memory 32 (# 13). Next, the data processing section 33 reads out the measurement data and the correction data from the data memory 32, and calculates the three stimulus values, chromaticity coordinates, and brightness of the measurement image.

Degrees, correlated color temperature, etc. (# 1 4). The calculation result (# 1 5) is displayed on the display section 3 4. In the above-mentioned embodiment, the amount of light on the incident surface A of the incident optical fiber 22 is uneven, and the unevenness is also averaged by adding the light beams that are incident on the two incident areas located away from each other. Therefore, the measurement value (tristimulus value) caused by the rotation of the conventional measurement head 2 (optical department K K 1) did not occur. because

580569 Correction t ′ is not affected by the light distribution characteristics of the object to be measured Q. It is possible to accurately measure color by performing high-precision measurement. & Next, the structure of the optical system KK2 of another embodiment of the measuring head 2 will be described. Fig. 9 is a diagram showing the structure of the optical system KK2 of another embodiment of the measuring head 2. Fig. 10 is a diagram showing a path from the light Q to the incident surface A in the optical system KK2 of Fig. 9. In FIG. 9 ′, the optical fiber KK2 is composed of an objective lens 103, an aperture stop 104, a field stop 105, a relay lens 106, and a bundle optical fiber 22. The objective lens 103 focuses the light beam from the object Q to be measured at the position of the field diaphragm 005, and forms an image. The relay lens 丨 〇6 guides the image formed at the position of the field diaphragm 〇05 to the incident surface A of the bundle optical fiber 22. The aperture stop 104 is disposed behind the objective lens 103, and only the light beam that has passed through the aperture stop 104 goes to the relay lens 106. The optical fiber 22 may be the same as that described above. The relay lens 106 is disposed at a position where the aperture stop 104 and the incident surface A become optically conjugated. In other words, the bundle optical fiber 22 is arranged such that the incident surface A and the aperture stop 104 are conjugated to the relay lens 106. In the case of using this optical system KK2, the position of the incident light incident on the incident surface a also depends on the exit angle of the light beam emitted from the object 1. That is, as shown in FIG. 10, after coming out of a certain point of the measurement area AR, it enters the light beam incident on the incident surface A, and the upper half of the light beam (the part indicated by the oblique line) The lower half, the lower half of the light beam (the part without the oblique line) enters the upper half of the incident surface A. In the case of using such an optical system KK2, by using the bundled optical fiber 2 2 described above, it is not affected by the light distribution characteristics and the like of the object to be measured q.

220M287-PFl (Nl) .ptc Page 14 580569 Case No. 91135055 Month Revision V. Description of the Invention (12) It can measure with high accuracy. In the above-mentioned embodiment, an example of the bundle optical fiber 22 having three emitting surfaces B is shown, but it is also possible to have two or more emitting surfaces B. The incident surface A may not be one. The method, shape, number, and structure, material, and shape of the incident area A of the incident surface A may be set to various other than the above. In the above-mentioned embodiment, the optical system of the measuring head 2 may adopt other various structures having a function of guiding the light from the object to be measured Q to the incident surface A. It shows an example in which the optical systems KK1 and 2 are embedded in the measuring head, but it may be built in various devices other than the measuring head, or it may be constituted by an independent optical system. In the above embodiment, the photoelectric conversion section 23 has a large sensitivity in the wavelength region of red light, green light, and blue light in the structure, but it may be set to a different spectral sensitivity. The function of the measuring instrument body 3 may be realized in software by a CPU executing an appropriate program, or may be realized by a hardware circuit, or may be realized by a combination thereof. The above embodiment shows an example in which the optical device of the present invention is applied to the colorimeter 1, but it can be applied to various optical devices or measuring devices other than the colorimeter 1. σσ In addition, according to the gist of the present invention, the structure, circuit, processing integration, processing sequence, processing sequence, various values, etc. of the whole or each part of the measuring head 2, the measuring device 3 or the colorimeter 1 can be appropriately changed. . The invention can be applied to the measurement of various measured objects other than the liquid crystal panel. [Effect of the invention]

2201-5287.PFl (Ni) .ptc P.15 580569 _Case No. 91135055_Year Month and Revise_ V. Description of the invention (13) According to the present invention, even if the light distribution characteristics of the measured object are asymmetric, Try to suppress unevenness in the amount of light emitted from the complex exit surface as much as possible, so that the accuracy of the measurement value measured according to the amount of light from the exit surface is improved.

2201.5287-PFl (Nl) .ptc p. 16 580569

Fig. 1 is a perspective view showing the appearance of a second embodiment of the present invention. ~ Tattoo value type photoelectric colorimeter Figure 2 shows a tristimulus value type photoelectric color block diagram. Fig. 3 is a diagram showing the optical system of the measuring head. Fig. 4 is a diagram showing the incident light on the bundle fiber. The functional structure of the meter. Figures 5 (A) ~ 5 (B) of the divided incident area are shown in the table. Figure 6 shows the light distribution characteristics of the light-to-object from the measured object divided by the diagram shown in Figure 7 A diagram of another area. Path map of the incident surface. Example of asymmetry

FIG. 8 is a flowchart showing a measurement operation of the colorimeter. Fig. 9 is a structural diagram showing an optical system of another embodiment of the measuring head. Fig. 10 is a path diagram of the radiation surface A of the optical system shown in Fig. 9 from the object to be measured. FIG. 11 is a view showing an incident area divided on a conventional incident surface. Colorimeter (tristimulus photoelectric colorimeter); 2 ~ measuring head (optical device for measurement); 21 ~ objective lens (condensing device); 22 ~ beam optical fiber (optical divergence device); 23 ~ photoelectric Conversion section (photosensitive device); 3 3 to data processing section (computing device); 103 to objective lens (first condensing device);

2201-5287-PFl (Nl) .p: c

580569 Case No. 91135055 Brief description of the revised diagram 104 ~ aperture stop; 105 ~ field diaphragm; 106 ~ relay lens (second condenser); KK1, KK2 ~ optical system (optical device for measurement); A ~ incident surface; AU ~ A 3 2 incident area; B ~ outgoing surface; Q ~ measured object.

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Claims (1)

580569 Case No. 91135055 Amendment VI. Application for Patent Scope 1. An optical device for measurement, including: optical divergence device, having a multiple exit surface that diverges the light from the measured object that is incident on the incident surface, and emits it. It is characterized in that the incident surface is divided into a plurality of incident regions structurally, and the respective incident surfaces are emitted from the respective emitting surfaces into non-adjacent plural incident regions different from each other. 2. If the optical device for measurement in item 1 of the patent application scope, The measuring optical device includes a light condensing device for condensing light from the object to be measured, and the light branching device is arranged so that the incident surface is located at a distance substantially equal to the focal point on the image side of the light concentrating device and its focal length Its location. 3. The optical device for measurement according to item 1 of the scope of patent application, wherein the optical device for measurement includes: a first light condensing device for condensing light from the object to be measured; an aperture stop disposed in the first Behind a condensing device; and a second condensing device that condenses the light that has passed through the aperture stop; the light branching device is disposed relative to the incident surface and the aperture stop of the second condensing device to become a common vehicle The position of the relationship. 4. The optical device for measurement according to item 1, 2 or 3 of the scope of patent application, wherein the plurality of incident areas corresponding to the respective exit surfaces are located at positions symmetrical to each other with respect to the center point of the incident surface. 5. The optical device for measurement according to item 1, 2, or 3 of the scope of application for a patent, wherein each of the plurality of incident areas corresponding to the respective exit surfaces is located at a random position on the entrance surface. 6. —An optical device for measurement, which is characterized by: 2201-5287-PFi (N!). Ptc P.19 580569 _Case No. 91135055_Year Month Amendment_ ^ VI. Patent application scope Optical divergence device, with structure from the object to be measured that will be incident on the incident surface A plurality of exit surfaces that are emitted after the light diverges, and the incident surface is divided into a plurality of incident areas. From each of the exit surfaces, a plurality of incident areas that are different from each other and are not adjacent to each other are emitted. The respective emitting surfaces are arranged opposite to each other, and the light incident on the incident surface is decomposed into color components and converted into electrical signals; and a computing device calculates a tristimulus value according to the electrical signals output from the photosensitive device. 2201-5287-PFl (Nl) .ptc Page 20