TW200303416A - 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~A32, and each emitted surface emits light onto plural different incident regions A11~A32 which are not adjacent.

Description

200303416 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a measurement device including a light divergence device including a plurality of light exit surfaces having a light exit from a measured object that is incident on an incident surface and divided. Optical device. The present invention is applied to, for example, a tristimulus value type photoelectric colorimeter for measuring or adjusting display characteristics (chroma, 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 arranged so as to be opposed to the measurement area AR of the measurement object Q, and converges the light beam 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 exit surfaces Bl, B2, and B3. The bundle optical fiber 22 is arranged such 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 configuration, only the light beams that are less than ^ α out of the light emitted from the measurement area 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. Photo sensor 2 3 2a ~ c

2201-5287-Pf (Nl) .ptd Page 4 200303416 V. Description of the invention (2) The spectral sensitivity compensation filter 23 la ~ c has a spectral sensitivity close to the color matching function, and each accepts self-emission surfaces B1 ~ B3 Of the beam. Therefore, an electrical signal is output from the photoelectric conversion section 23 to decompose the light beam incident on the incident surface A into color components of the three primary colors. 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 directed toward the exit surface B 1 and emitted, and the light beam incident on the incident area A j 2 is directed on the exit surface B 2 and emitted, and the light beam incident on the incident area A j 3 is directed on the exit surface B 3 and emitted. [Summary of the Invention] The problem to be solved by the invention in the past was' the incident surface A of the bundle optical fiber 22 was divided into only three incident areas Ajl ~ 3, and according to the light distribution characteristics of the measured object Q, the incident areas Aji ~ 3 Variations in light sensitivity (illuminance variations) occur between them. Therefore, when the relationship between the rotational angle position of the incident surface A and the measured object q is changed, the photosensitive quantity of the photosensitive sensors 2 3 2 a to c varies. As a result, there are three obtained from the measured value. Problems with stimulus changes. That is, as shown in FIG. 6, for example, a light beam KSa having a circular cross section that is incident on the incident surface A from a point in the measurement area AR is considered. The upper half of the light beam KSa (the part indicated by the oblique line in FIG. 6) enters the upper part of the incident surface A, and the lower half of the light beam (the part without the oblique line in FIG. 6) enters the half of the incident surface a . This is not a problem when the measured light distribution characteristics are symmetrical with respect to its normal system ', but there are problems when the light distribution characteristics are asymmetric.

2201-5287-Pf (Nl) .ptd f Page 2003200316 V. Explanation of the invention (3) That is, as shown in FIG. 7, among the light beams KS from the object Q to be measured, the light beams that are directed upwards are downward. When the outgoing beam is large, the upper half of the incident surface A becomes brighter and the lower half becomes darker. As a result, the amount of light incident on the three incident areas A jl to 3 is uneven. Therefore, when the relationship between the position of the rotation angle of the incident surface A and the object Q to be measured changes, the sensitivity of the same photosensitive sensors 232a to c varies. For example, in the case of the rotation angle position shown in FIG. 11, the light intensity of the incident area A jl above is the most, but the rotation angle position of the beam fiber 22 is changed by 180 degrees, and the incident area A j 1 comes to the bottom. , Its light sensitivity becomes the smallest. 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 a liquid crystal panel, it is often seen that the light distribution characteristics are asymmetrical up and down ', which becomes a problem when measuring the optical characteristics of a liquid crystal display. The object of the present invention is to provide an optical device for measurement, which aims to provide an optical device for measurement, which is a case where the light distribution characteristics of the object to be measured are asymmetrical. The accuracy of the measurement value measured in accordance with the amount of light from the emitting surface is improved. Means for Solving the Problem The optical device for measurement of the present invention includes a light diverging device having a plurality of exit surfaces that diverge light from the object to be measured that is incident on the incident surface, and divides the incident surface structurally. Plurality of incidents = From this exit plane, the incidents are not incident on the multiple incident areas that are different from each other. Preferably, the measuring optical device includes condensing light from the object to be measured

2201-5287-Pf (Nl) .ptd Page 6 200303416 V. Description of the Invention (4) ~ " '" a " "' ^ device 'Configure the optical divergence device such that the incident surface is located away from the water The position of the image-side principal point of the optical device and a distance at which the focal length is approximately equal.者 者 'The optical device used for this quantity includes a first condensing device that condenses light from the object to be measured; an aperture stop is disposed behind the first condensing device f; and a second condensing device The device condenses the light passing through the aperture stop iron. The optical divergence device is arranged at a position where the entrance surface of the second condenser device and the aperture stop iron are in a common vehicle relationship. Also, each of the plural incident areas corresponding to the respective exit surfaces is located at positions symmetrical to each other with respect to the center point of the incident surface. Alternatively, the plurality of incident areas corresponding to the respective ° exit surfaces of the respective spears are located at random positions on the incident surfaces. ^ The structure & includes: a light-sensitive device, and a configuration facing each of the light diverging devices. The light incident on the incident surface is decomposed into a knife and converted into an electric letter. 4 # 虎 ， 计 异 1 Set, according to the stimulus value of the different tristimulus from the photosensitive device. 4 It can be applied to various optical devices or measuring devices such as colorimeters. =: = Type, according to the situation, ...-The measurement surface of the measurement surface is = = = = ^ = The projection surface is divided into a plurality of incident areas, which are different from each other. A plurality of incident areas ⑨; the respective emitting surfaces of the sensing surface emitting and the chirping light divergence device are opposite to each other: there is' decompose the light incident on the incident surface into three primary colors], the gas signal of the photosensitive part; Converted from this photoreceptor wheel f to electricity • Tunzhi Electric Page 2201 -5287-Pf (N 1). Ptd 200303416

2201-5287-Pf (Nl) .ptd Page 8 200303416 V. Description of the invention (6) Calculate the three stimulus values (X, γ, z), xy Y (chromaticity coordinates, brightness, etc.) formulated by the International Commission for Illumination (CIE) ), Τ ΔυνΥ (correlated color temperature, color difference from blackbody locus, brightness), etc. In Figs. 2 and 3, the measuring head 2 is composed of an optical lens KK 1 for measurement including an objective lens 21 and a beam optical fiber 22, and a photosensitive system JK1 composed of a photoelectric conversion section 23 and an amplification section 24. The photoelectric conversion unit 2 3 includes 3 photo-sensing sensors 2 3 1 a to c and S P C, etc., which are each composed of 3 spectral sensitivity compensation filters 2 3 2 a to c.

It is arranged on the central axis of the emitting surfaces B1, B2, and B3, and receives the light beams emitted from the emitting surfaces B1, B2, and B3. The spectral sensitivity compensation filters 23 la to c are respectively disposed at appropriate positions between the photoreceptors 2 3 2 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 2 3 2 a is compensated to the photosensitivity of a color matching function (X · bar · again) having a large sensitivity in the wavelength region of red light. In addition, the other spectral A sensitivity compensation filters 231b and 231c each have a filter characteristic having sensitivity in a wavelength region of green (G) or blue (B) light, and the photosensitive sensor is used to utilize the filter characteristic 2 32b is compensated to have a large

”Color matching function (Y .bar · λ), the sensitivity * sensitivity, compensates the light sensing M32c to a color with a large sensitivity in the wavelength region of M light = distribution i: (Z · bar · λ) Therefore, the electric signals (photosensitivity numbers) of phase t relative to the three stimulus values (γ, γ, ζ) are output from the photosensitive sensors 2 = a ~ c.

200303416 V. Description of the invention (7) The amplifying section 24 amplifies the electric 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 2 is divided into six fan-shaped incident areas A11, A1 2, A 2 1, A 2 2 and A 3 1, A 3 2. It can be seen from FIG. 4 that the incident areas A11 and A1 2, the incident areas A 2 1 and A 2 2, and the incident areas A 3 1 and A 3 2 are located at positions symmetrical to each other about the optical axis l as a center. The light beams entering these two incident areas located at point-symmetrical positions are emitted from the same exit surface. That is, the light beams entering the incident areas A i 1 and A1 2 are guided to the exit surface B1, the light beams entering the incident areas A2i and A22 are directed to the exit surface B2, and the light beams entering the incident areas A31 and A32 are directed to the exit surface B 3 〇Then, the light beams entering the non-adjacent and different plural incident areas of the incident surface A are guided to the exit surfaces B1, β2, and B3, and those beams are added out from the exit surfaces B1, B2, and B3. Therefore, 'the light beam incident on the incident surface A has unevenness in the incident surface a, and the unevenness is also averaged by adding the light beams incident on the two incident regions 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, the two incident areas that are located on the opposite side of each other with respect to the center of the incident surface a are grouped by a pair of buckles ^ I, Λ ^ old and one exit surface, as shown in FIG. 7.物 Q 的 配 来 斗 主 ^. Nine characteristics are the case of up and down asymmetry, and the feeling of 2 incident areas is added to this, which is called 4 I, which cancels the asymmetry of the light distribution characteristics and the rotation angle sound of the optical fiber 22 # $ > η 度Position-independent light emission from each exit surface

2201-5287-Pf (Nl) .ptd version 200303416

5. Description of the invention (8) Beams of approximately the same amount. Therefore, the electrical signals output by each of the light-sensitive sensors 23 of the photoelectric conversion unit 23 are not affected by the asymmetry of the light distribution characteristics of the object q, and therefore, the accuracy of the measurement value can be improved. μ In addition, in FIG. 4, each incident area a 1 1 to A 3 2 has a fan shape surrounded by a straight line and an arc. However, in fact, each incident area is formed by the end faces of a plurality of optical fiber prime lines, and the boundary of the incident area may not necessarily be Beautiful straight lines and arcs. For example, 'the incident areas adjacent to each other in the boundary portion may invade the opposite side of each other. In the above-mentioned embodiment, the two incident areas at the point-symmetrical positions correspond to one exit surface, but as shown in FIG. 5 (A), the positions are symmetrical at the points divided by the central angle every 30 degrees. Four of the incident areas may correspond to one exit surface. That is, in FIG. 5 (A), the four incident areas AU, A12, A13, and A14 correspond to the exit surface B1, and the four incident areas A21, eight 22, A23, A24, and the exit surface B2 correspond to four incident areas. The areas A31 and A32 may correspond to A3 丄 and the emitting surface B3, respectively. Therefore, it is also possible to correspond to 2 · η (η integers) incident areas and one exit plane located at point symmetry = position. In addition, it is also possible to correspond to a plurality of points that are not at the point symmetry position and add U-planes. For example, let # 盖 I 幺 区 or a shot J ^ be centered on the optical axis [at the center of the fe η (η is an integer of 3 or more). Personal A VII. The angle of the temple ^, the shot area and a Correspondence of injection surface is possible. So that 隹 is not in point symmetry but is in μ

The plural C-radiation plane A of the position where the inner sentences are averaged is also acceptable. For example, as shown in Fig. 5 (B), the number of incident areas corresponding to the H emission surfaces on the human body and one injection + ^ ^ ^ randomly arranged multiple injection surfaces A can also correspond. Especially in the shooting area

Page 11 200303416___ 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 face of each of the optical fibers constituting the bundle optical fiber 22 is an incident area, and those optical fibers are randomly distributed in one of the three exit surfaces B. In FIG. 5 (B), a plurality of people shoot 'fields ;; factory, A12, A13, ... correspond to one exit surface B1, and the same incident area A21, A2 2, A23, ... correspond to one exit surface B2, and the incident area A31 , A3 2, A33, ... correspond to an injection surface B3. These incident areas A1 i, A1 2, A1 3,... Are randomly arranged on the incident surface A. The incident areas A2 1, A22, A23, ... and the incident areas A31, A32, A33, ... are also randomly arranged on the incident surface A. In this embodiment, an optical fiber is used for the optical branching device, but another optical member having the same function, such as a light pipe, may be used. Returning to FIG. 2, the measuring instrument body 3 is composed of an A / D conversion unit 31, a data memory 3 2, a data processing unit 3, a display unit 3 4, an operation input unit 35, and a control unit 36. The A / D conversion section 31 converts the electrical signals SX, SY, and SZ input from the measuring head 2 into digital measurement data DX, DY, and DZ. The data memory 32 stores measurement data DX, DY, DZ, calibration data KX, KY, KZ and other data output from the A / D conversion section 31. The data processing unit 33 uses the measurement data stored in the data memory 32 to calculate tristimulus values, xyY, T Λινν, and the like. For example, the calibration data KX, KY, and KZ are used to calculate the tristimulus values X, Y, and Z according to the following formula.

2201-5287-Pf (Nl) .ptd Page 12 200303416 V. Description of the invention (10)

\ 2 KX · DX Y 2 KY · DY Z- KZ · DZ The display section 34 displays the calculation result. The operation input section 35 is operated by the user to input various information about measurement (instructions for measurement, setting of display mode, measurement range, etc.). The control unit 36 centrally controls the operation of the measuring head 2 and the operations and processing of each unit in the measuring unit body 3. Next, the measurement operation of the colorimeter 1 will be described using the flowchart of FIG. 8. In FIG. 8, first, as shown in FIG. 1, the measuring head 2 is set so as to face the measurement area A R (# 丨 丨) of the liquid crystal panel of the measurement object Q. 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 a measurement image is displayed, three photosensitive signals SX, SY, and SZ regarding the three stimulus values are output from each of the photosensitive sensors 2 32a to c. The amplified signal is amplified to a predetermined level by the amplifying section 24, and then input to the measuring device body 3. After the measuring device body 3 'uses the A / D conversion section 31 to convert the photosensitive signal into measurement data d X, d γ, and DZ, it is stored in the data memory 32 (# 13). Next, the “data processing section 33” reads out the measurement data and the calibration data from the data memory 32, and calculates the tristimulus value, chromaticity coordinates, brightness, and correlated color temperature of the measurement image (# 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 KK1) does not occur. because

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200303416 V. Description of the invention (π) In addition, it is not affected by the light distribution characteristics of the measured object Q, and it can accurately measure color by performing high-precision measurement. Next, the structure of the optical system KK2 in another embodiment of the measuring head 2 will be described. FIG. 9 is a structural diagram of an optical system KK 2 showing another embodiment of the measuring head 2, and FIG. 10 is a path diagram of light from the object Q to the incident surface A in the optical system KK 2 of FIG. 9. . In FIG. 9, the optical system KK2 is composed of an objective lens 103, an aperture stop 104, a field stop 105, a relay lens 106, a bundle optical fiber 22, and the like. The objective lens 103 condenses the light beam from the object to be measured Q at the position of the field stop 105 and forms an image. The relay lens 106 guides the image formed at the position of the field stop 105 to the incident surface A of the bundle optical fiber 22. The aperture stop 104 is arranged 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 bundle optical fiber 22 may be the same as 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 so that the incident surface A and the diaphragm stop iron 104 have a common roll relationship with the relay lens 106. In the case of using this optical system K K 2, the position of the incident light incident on the incident surface a also depends on the exit angle? That is, as shown in FIG. 10, after a certain point of the measurement area ... comes out of the light beam incident on the incident surface A, the upper half of the light beam (the part indicated by the oblique line) is incident on the lower half of the incident surface A (The part without the oblique line enters the upper half of the incident surface A.) In the case of using this optical system KK2, the optical fiber 22 is used without being affected by the beam. Effects of light distribution characteristics of the test object q

200303416 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. It is not necessary to have only one incident surface A system. The method, shape, number, and structure, material, and shape of the incident area A of the incident area 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 directing the light from the object to be measured Q to the incident surface A. This example shows that the optical system KK 1 and 2 are embedded in the measuring head. It can be used for various devices other than the measuring head, and it can also be an independent :: structure. Nine sons and sisters 1. In the above embodiment, the photoelectric conversion unit 23 has a large sensitivity in the wavelength region of red light, green light, and monitor light, but it may be set to have a spectral sensitivity. The function of the measuring instrument body 3 can be implemented by using ^; the CPU of each program can be realized by software, and it can also be realized by hardware circuits or by a combination thereof. Applicable to color optical devices In the above-mentioned embodiment, the example of the optical cluster meter 1 according to the present invention is shown, but it can be applied to various or measuring devices other than the color meter 1. In addition, according to the gist of the present invention, the structure, circuit, contents, processing sequence, processing sequence, various values, etc. of the measuring head 2 or the whole or each part of the measuring body 3 or the colorimeter 1 can be changed as appropriate. The present invention can measure two kinds of objects to be measured other than a liquid crystal panel. … '[Inventive effect]

200303416

2201-5287-Pf (Nl) .ptd Page 16 200303416

Fig. 1 is a perspective view showing the appearance of a second embodiment of the present invention. Two-stimulus-type photoelectric colorimeter Figure 2 shows a tristimulus-type photoelectric block diagram. Rectangular functional structure Figure 3 shows the incident area of the optical system of the measuring head. Figure 4 shows the incidence of the optical fiber in the bundle. Figures 5 (A) to 5 (B) are the incident incidents divided by the plane. Figure 6 is a diagram showing other examples of light from the measured object to σσ or above. FIG. 7 is a view showing a road surface of a distribution surface of a measured object. 70 7-inch sex is not right for cats & Example of F vs.% property Fig. 8 shows the amount of colorimeter j Fig. 9 shows the difference of the measuring head Fig. 10 shows the path diagram on the optical surface A of Fig. 9. Flow chart of actions. Structure diagram of the optical system of the embodiment 糸 The light from the object to be measured to FIG. 11 is a colorimeter (three stimulus value photoelectric colorimeter) showing the incident area divided on the explanation surface of the incident symbol in the past. 2 ~ measuring head (optical measurement for measurement) ° '21 ~ objective lens (condensing device); 2 2 ~ bundle optical fiber (optical divergence device); 23 ~ photoelectric conversion unit (photosensitive device); 3 3 ~ data processing (Computing device); 10 3 ~ objective lens (first condensing device);

2201-52S7-Pf (Nl) .ptd 200303416 Brief description of the diagram 104 105 106 KK1 Aperture stop iron; Field of view stop iron; Relay lens (second condensing device); KK2 ~ Optical system (Measuring optical device) A ~ Incident surface; A 1 1 ~ A 3 2 incident area; B ~ exit surface; Q ~ measured object.

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Claims (1)

200303416 VI. Scope of patent application ____ 丨 · An optical device for measurement, including: optical branching device i, = complex emission after the light branching from the measured object that enters the incident surface is characterized by: The incident surface is divided into a plurality of incident areas, and a plurality of non-adjacent complex incidents are emitted from the emitting surface. 2. If the optical device for measurement of item 丨 of the patent application scope is issued, the measurement The optical device includes a position from which the optical divergence device is arranged, and the optical divergence device is arranged at a distance of approximately equal to the principal point of the image side of the optical device and the focal length thereof. Τ 先 衣装 3. If the optical device for measurement in item i of the patent application scope, the optical device for measurement includes: "Medium" No. :: Concentrating device that condenses the light from the object to be measured; aperture jh iron 'is placed in the ancient female flute ^. First, ... ”Brother—the first device is behind the device; and Brother Yishui is the first to place the light to condense the light that has passed through the aperture to stop the iron. The second spotlight is in a conjugate relationship with the diaphragm stop iron. . / Incoming plane and measuring optics in the range 1'2 or 3 of the measurement optics Each of Bazhong's corresponds to the respective exit plane This is a symmetrical position with respect to the center point of the incident plane. The radiation field is located at the measurement light beam of item i'2 or 3 on the other side. The radiation surface is located at a random position. The plane of incidence of the unit number is in this 6.-A measuring optical device ', which is characterized by: 2201-5287-Pf (Nl) .ptd Page 19, 200303416 6. The patent application scope optical divergence device has a structure that has a complex exit surface that emits the divergent light from the measured object that is incident on the incident surface. The incident surface is divided into a plurality of incident areas, and from each of the emitting surfaces, a non-adjacent complex incident area that is different from each other is emitted; the photosensitive device and the respective emitting surfaces of the optical divergence device are arranged to face each other, and will be incident on the The light on the incident surface is decomposed into color components and converted into electrical signals; and a computing device calculates a tristimulus value based on the electrical signals output from the photosensitive device. 2201-5287-Pf (Nl) .ptd Page 20