JP2022129795A - Optical property measuring device - Google Patents

Abstract

To provide an optical property measuring device capable of maintaining constant measurement accuracy requiring no skills for adjustment work at the time of measurement while easily changing the aspect of light, such as the position of the light emitted from a light source and the shape and size of the light.SOLUTION: The optical property measuring device includes: a holding means 1 for holding a sample W; a light source capable of irradiating light to the sample W held by the holding means 1; an optical path forming means capable of forming an arbitrary optical path by reflecting or transmitting the light irradiated from the light source to the sample W; and detection means 9 capable of detecting the light reflected or transmitted through the sample W along the optical path formed by the optical path forming means. The optical property measuring device is capable of evaluating the optical characteristics of sample W based on the light detected by the detection means 9. The light source consists of a projector 2 that can emit arbitrary light at the desired position.SELECTED DRAWING: Figure 1

Description

The present invention relates to an optical property measuring apparatus capable of evaluating optical properties of a sample based on light detected by a detection means.

Conventionally, an optical characteristic measuring apparatus capable of evaluating the optical characteristics of a sample by irradiating the sample with light, reflecting or transmitting the light, and detecting the reflected light or transmitted light is disclosed, for example, in Patent Document 1. there is Such a conventional optical characteristic measuring apparatus is configured to irradiate light from a light source (light emitter) through an optical fiber from an irradiation device toward a sample, and by arbitrarily moving the irradiation device with respect to the sample , specular reflectance, diffuse reflectance, linear transmittance and diffuse transmittance.

JP 2019-144089 A

However, in the above-described prior art, it is difficult to arbitrarily change the position, shape, or size of the irradiation light from the light source, and it is necessary to move the light source according to the object to be measured. When changing the position of the irradiation light, the form of the light, etc. according to the object, there is a problem that adjustment work at the time of measurement requires skill and it is difficult to keep the measurement accuracy constant.

The present invention has been made in view of such circumstances, and it is possible to easily change the position of the irradiation light from the light source and the form of light such as the shape and size of the irradiation light. To provide an optical characteristic measuring device capable of maintaining constant measurement accuracy without requiring skill.

The invention according to claim 1 comprises holding means for holding a sample, a light source capable of irradiating the sample held by the holding means, and the light emitted from the light source being reflected or transmitted to the sample. an optical path forming means capable of forming an arbitrary optical path by causing the sample to form an arbitrary optical path; and a detecting means capable of detecting light reflected or transmitted through the sample along the optical path formed by the optical path forming means, An optical characteristic measuring apparatus capable of evaluating optical characteristics of the sample based on light detected by a detecting means, wherein the light source comprises a projector capable of irradiating arbitrary light at a desired position. do.

The invention according to claim 2 is the optical characteristic measuring apparatus according to claim 1, wherein the optical path forming means is capable of forming an arbitrary optical path while the light source and the detecting means are fixed at predetermined positions. characterized by

The invention according to claim 3 is the optical characteristic measuring apparatus according to claim 1 or 2, characterized in that the detection means is capable of detecting a luminance distribution of light reflected or transmitted through the sample. .

The invention according to claim 4 is the optical characteristic measuring apparatus according to any one of claims 1 to 3, wherein the light source is installed above or below the base part on which the sample is arranged, and the It is characterized in that a reflecting mirror capable of reflecting the light emitted from the light source onto the sample on the base is attached.

According to a fifth aspect of the present invention, there is provided an optical characteristic measuring apparatus according to any one of the first to fourth aspects, further comprising display means capable of displaying a result of detection by the detection means.

According to a sixth aspect of the present invention, in the optical characteristic measuring apparatus according to the fifth aspect, the display means can display a visible image based on the detection result in addition to the detection result by the detection means. do.

The invention according to claim 7 is the optical characteristic measuring apparatus according to any one of claims 1 to 6, wherein the holding means is a prism capable of reflecting, transmitting or diffusely reflecting incident light through the sample. is attachable.

According to an eighth aspect of the invention, there is provided the optical characteristic measuring apparatus according to the seventh aspect, wherein the prism is formed in a trapezoidal shape capable of bending the path of light at a desired angle.

According to the first aspect of the invention, the light source is a projector capable of irradiating arbitrary light at a desired position. It can be easily changed, and the measurement accuracy can be kept constant without requiring skill for adjustment work at the time of measurement.

According to the second aspect of the invention, the optical path forming means can form an arbitrary optical path while the light source and the detecting means are fixed at predetermined positions. can let

According to the invention of claim 3, the detection means can detect the luminance distribution of the light reflected or transmitted through the sample, so that the optical characteristics of the sample can be easily and favorably evaluated.

According to the invention of claim 4, the light source is installed above or below the base portion on which the sample is arranged, and a reflecting mirror is attached that can reflect the light emitted from the light source onto the sample on the base portion. Therefore, the installation space of the device can be reduced.

According to the invention of claim 5, since the display means is provided so as to display the detection result by the detection means, the detection result can be grasped quickly during or after the measurement.

According to the sixth aspect of the present invention, the display means can display not only the result of detection by the detection means, but also a visible image based on the result of detection, so that the visual image can be grasped more accurately.

According to the seventh aspect of the invention, the holding means can be attached with a prism capable of reflecting, transmitting or diffusing the incident light through the sample. can be made

According to the eighth aspect of the invention, the prism is formed in a trapezoidal shape that can bend the path of light at a desired angle. can be bent to a desired angle.

FIG. 1 is an overall schematic diagram showing an optical characteristic measuring device according to an embodiment of the present invention; A perspective view showing the device configuration on the base part in the same optical property measuring device. Schematic diagram showing a prism formed in a holding means for holding a sample in the same optical property measuring apparatus. Schematic diagram showing the path of light reflected by the prism Schematic diagram showing the path of light passing through the prism Schematic diagram showing the path of light diffusely reflected by the prism A plan view showing the device configuration and the optical path on the base part in the same optical characteristic measuring device. Schematic diagram showing the luminance distribution of light passing through the optical path of FIG. A plan view showing the device configuration and the optical path on the base part in the same optical characteristic measuring device. Schematic diagram showing luminance distribution of light passing through the optical path of FIG. Schematic diagram showing contents displayed by display means in the same optical property measuring device

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The optical characteristic measuring apparatus according to this embodiment can evaluate the optical characteristics of a sample based on the light detected by the detecting means. As shown in FIGS. Light projector 2 as a light source, control means 3, optical filters (4, 5, 6), movable deflection angle means 7, fixed deflection angle means 8, base portion B, transmission plate 10, and display plate 11 (display means).

The main body F constitutes a darkroom, and in the interior of the darkroom are arranged various components constituting the apparatus. The interior of the main body F is divided in the vertical direction by partition plates D1 and D2. Means 3 are arranged respectively. Furthermore, reflecting mirrors M1 and M2 are attached to the upper and middle stages of the main body F, respectively.

However, in this embodiment, the light projector 2 as a light source is installed below the base portion B on which the sample W is arranged, and the light emitted from the light projector 2 is projected onto the base portion B. The sample W can be reflected by the reflecting mirrors M1 and M2. It may be configured so that the light can be reflected by the reflecting mirrors M1 and M2 onto the sample W on the base portion B. FIG.

The projector 2 is called a projector capable of projecting an image or the like onto a screen, and in this embodiment, it is composed of a light source capable of irradiating the sample W held by the holding means 1 with light. The projector 2 is composed of, for example, an LED projector or the like using light emitting diodes 2 as a light source, and is controlled by the control means 3 to irradiate arbitrary light (light of arbitrary size, shape and color) at a desired position. It is possible.

As a specific example of the light projector 2, for example, as shown in FIG. 1, there is a light source 2a such as a lamp, a prism 2b, a lens 2c, and the like. In this case, the light emitted from the light source 2a is separated into the three primary colors (red, green, and blue) of light, and one liquid crystal panel is assigned to each of the three primary colors to transmit the light. The decomposed light is combined by the prism 2b to form the colors and shapes that make up the image, and then projected outside (towards the reflecting mirror M1 in this embodiment) through the lens 2c. The Rukoto.

The control means 3 is composed of a personal computer or the like for controlling the projector 2, and arbitrarily adjusts the irradiated light to arbitrarily control the irradiation position, size, shape, color, intensity, etc. of the light. It is adjustable. The light emitted from the light projector 2 controlled by the control means 3 is reflected by the reflecting mirrors M1 and M2, respectively, and then is irradiated substantially parallel to the upper base portion B. Become.

As shown in FIG. 2, the base portion B is provided with a holding means 1, optical filters (4, 5, 6) constituting an optical path forming means, a movable deflection angle means 7 and a fixed deflection angle means 8. It is. The holding means 1 is for holding a sample W, which is an object to be measured, and is fixed at a predetermined position on the base portion B. As shown in FIGS. is configured with

The contacting means 1a is attached in close contact with the prism portion 1b, and is made of, for example, an optical bonding sheet (adhesive sheet) or the like that eliminates an air layer between the sample W and the prism portion 1b and brings them into optical contact. . Instead of the optical bonding sheet, the contacting means 1a may be another type of adhesive or oil such as an optical adhesive or silicone oil that can match the refractive indices of the prism and the sample W. The prism portion 1b is composed of a trapezoidal prism having slopes a and b, short sides c and long sides d in plan view, and reflects and transmits light to and from the sample W fixed to the contact means 1a. It is possible to

For example, when light is reflected by the sample W, as shown in FIG. 4, the light incident on the prism portion 1b is bent at the slope a, reflected at a predetermined angle with respect to the sample W, and then reflected at the slope b. The light is emitted from the prism portion 1b while being bent. When light is transmitted through the sample W, as shown in FIG. 5, the light incident from the short side c of the prism portion 1b is emitted from the long side d and passes through the sample W. As shown in FIG. Furthermore, when the light is diffusely reflected by the sample W, as shown in FIG. 6, the light incident on the prism portion 1b is bent at the slope a, reflected at a predetermined angle with respect to the sample W, and then reflected by the prism portion 1b. is emitted from the short side c of .

The optical filters (4, 5, 6) are configured with lenses (4a, 5a, 6a) capable of transmitting light, and the optical filters (4, 5) filter the light ( The optical filter 6 guides (guides) the incident light) and guides (guides) the light (emitted light) after the sample W has been irradiated by the optical filter 6 . The lenses (4a, 5a, 6a) are sufficient as long as they can pass and guide light. For example, they may be lenses, polarizers, optical thin films, or the like. The optical filters (4, 5, 6) are slidable along slide rails La to Lc attached to the base portion B, and can be set at arbitrary positions.

The movable deflection angle means 7 is provided with a mirror portion 7a capable of reflecting light, and is slidable on slide rails Lb. The movable deflection angle means 7 has a mirror portion 7a that is rotatable. 9) are adjustable. The fixed deflection angle means 8 can reflect light, and is fixed at a position facing the movable deflection angle means 7 with the holding means 1 interposed therebetween.

In the present embodiment, the optical filters (4, 5, 6), the movable deflection angle means 7 and the fixed deflection angle means 8 reflect or transmit the light emitted from the projector 2 (light source) to the sample W to arbitrarily constitutes an optical path forming means capable of forming an optical path of In particular, the optical path forming means according to the present embodiment is capable of forming arbitrary optical paths (specular reflection light path H1, transmitted light path H2 and diffusion light path H1) with the light projector 2 (light source) and the detection means 9 fixed at predetermined positions. A reflected light path H3) can be formed.

Specifically, in the measurement mode 1, as shown in FIG. 7, the optical path forming means causes the light that has passed through the optical filter 4 to reflect off the sample W and then pass through the optical filter 6 on a specular reflection light path. H1 (the path indicated by the dotted line in FIG. 7), and a transmitted light path H2 (the path indicated by the dotted line in FIG. 7), in which the light that has passed through the optical filter 5 is reflected by the movable deflection angle means 7 and transmitted through the sample W, and then reflected by the fixed deflection angle means 8 ( 7) are formed.

In the measurement mode 2, as shown in FIG. 8, the light path forming means (in this case, the mirror portion 7a of the movable deflection angle means 7 is rotated by 90°) causes the light passing through the optical filter 4 to pass through the sample. Specularly reflected light path H1 (the path indicated by the dotted line in FIG. 8) passing through the optical filter 6 after reflecting W, and the light passing through the optical filter 4 being diffusely reflected by the sample W, the movable deflection angle means 7 A diffusely reflected light path H3 (a path indicated by a chain double-dashed line in FIG. 8) is formed.

The detection means 9 is capable of detecting the light reflected or transmitted through the sample W along the optical path formed by the optical path forming means, and is installed, for example, at a position adjacent to the main body F (in a separate dark room or the like). It consists of a hyperspectral camera, an illuminometer, a luminance meter or a digital camera. Specifically, the detection means 9 according to this embodiment can detect light transmitted through a transmission plate 10 attached to the main body H, and can detect the luminance distribution of light reflected or transmitted through the sample W. It is said that

For example, in measurement mode 1, as shown in FIG. 8, the light that has passed through the specularly reflected light path H1 and the light that has passed through the transmitted light path H2 are detected as luminance distributions. , the light passing through the specular reflection light path H1 and the light passing through the diffuse reflection light path H3 are detected as luminance distributions.

The transmission plate 10 is composed of a transmission screen that transmits light before it is detected by the detection means 9. When the brightness of the transmitted light is high, it can be adjusted by the gain of the transmission screen. . As shown in FIG. 11, the light transmitted through the transmission plate 10 is displayed as a two-dimensional luminance distribution of the light (in the figure, the light on the specular reflection light path H1 and the light on the transmission light path H2). It will happen.

A display plate 10 is formed above the transmission plate 10 . The display panel 10 includes a display section 11a that displays measurement items, a display section 11b that displays the detection result by the detection means 9, and a display section 11c that displays a visible image based on the detection result by the detection section 9. is configured with The display section 11a displays the conditions (various parameters, etc.) at the time of measurement, and the display section 11b displays not only the transmittance and reflectance, but also the degree of glossiness and the degree of polarization. .

Furthermore, when the sample W is actually used for a part or the like, the display unit 11c displays an image, video, or the like based on the detection result as a visible image. It is configured so that appearance and the like can be visually grasped. As a result, the visual image based on the optical properties of the sample W can be accurately grasped during or after the measurement, and the sensory evaluation can be performed quickly.

According to the optical characteristic measuring apparatus according to this embodiment, the light source is composed of the projector 2 capable of irradiating arbitrary light at a desired position. The shape of the light can be easily changed, and the measurement accuracy can be kept constant without requiring skill for adjustment work at the time of measurement. Further, since the optical path forming means according to the present embodiment can form an arbitrary optical path in a state where the projector 2 (light source) and the detecting means 9 are fixed at predetermined positions, adjustment work at the time of measurement is required. can be made easier.

Furthermore, the detection means 9 according to the present embodiment can detect the luminance distribution of the light reflected or transmitted through the sample W, so the optical characteristics of the sample W can be evaluated easily and satisfactorily. Furthermore, the light projector 2 (light source) is installed above or below the base portion B on which the sample W is arranged, and the light emitted from the light projector 2 (light source) is projected onto the base portion B Since the reflecting mirrors (M1, M2) that can reflect light onto the sample W are attached, the installation space of the apparatus can be reduced.

Further, according to this embodiment, the display panel 11 (display means) capable of displaying the detection result by the detection means 9 is provided, so that the detection result can be quickly grasped during or after the measurement. Furthermore, the display panel 11 (display means) according to the present embodiment can display a visible image based on the detection result in addition to the detection result by the detection means 9, so that the visual image can be grasped more accurately. be able to.

In particular, according to this embodiment, the holding means 1 can be attached with a prism (prism part 1b) that can reflect, transmit or diffusely reflect incident light through the sample W, so that the properties of the prism can be used. can reflect or transmit light. In addition, since the prism is formed in a trapezoidal shape that can bend the path of light to a desired angle, it is possible to easily bend the light to a desired angle by arbitrarily adjusting the length and angle of the side of the trapezoid. can be done.

Although the present embodiment has been described above, the present invention is not limited to this, and for example, the optical path forming means may be configured by other parts, or the display panel 11 may not be provided. In addition to the measurement modes 1 and 2, it may be possible to select a measurement mode capable of detecting other light. Furthermore, in this embodiment, the base portion B and the light projector 2 are arranged in two stages, one above the other. You may set it.

As long as the light source is a projector that can irradiate arbitrary light at a desired position, it can be applied to a device having a different external shape or a device to which other functions are added.

1 holding means 1a close contact means 1b prism portion 2 light projector (light source)
3 control means 4, 5, 6 optical filter 7 movable deflection angle means 7a mirror section 8 fixed deflection angle means 9 detection means 10 transmission plate 11 display plate (display means)
W Sample B Base portion F Main body D Demarcation plate H1 Specularly reflected light path H2 Transmitted light path H3 Diffuse reflected light path M1, M2 Reflector La to Lc Slide rail

Claims (8)

holding means for holding the sample;
a light source capable of irradiating light onto the sample held by the holding means;
an optical path forming means capable of forming an arbitrary optical path by reflecting or transmitting the light emitted from the light source to the sample;
a detecting means capable of detecting light reflected or transmitted through the sample along the optical path formed by the optical path forming means;
An optical characteristic measuring device capable of evaluating the optical characteristics of the sample based on the light detected by the detecting means,
An optical characteristic measuring apparatus, wherein the light source comprises a projector capable of irradiating arbitrary light at a desired position. 2. The optical characteristic measuring apparatus according to claim 1, wherein said optical path forming means is capable of forming an arbitrary optical path while said light source and detecting means are fixed at predetermined positions. 3. An optical characteristic measuring apparatus according to claim 1, wherein said detection means is capable of detecting a luminance distribution of light reflected or transmitted through said sample. The light source is installed above or below the base portion on which the sample is arranged, and is equipped with a reflecting mirror capable of reflecting the light emitted from the light source onto the sample on the base portion. The optical characteristic measuring device according to any one of claims 1 to 3. 5. The optical characteristic measuring apparatus according to claim 1, further comprising display means capable of displaying a result of detection by said detection means. 6. The optical characteristic measuring apparatus according to claim 5, wherein said display means can display a visible image based on said detection result in addition to said detection result by said detection means. 7. The optical characteristic measurement according to any one of claims 1 to 6, wherein said holding means has a prism capable of reflecting, transmitting or diffusely reflecting incident light through said sample. Device. 8. The optical characteristic measuring apparatus according to claim 7, wherein said prism is formed in a trapezoidal shape capable of bending a path of light at a desired angle.

Images