JP2003156393A - Method and instrument for measuring deformation luminous intensity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deformation luminous intensity measuring instrument that can measure deformation luminous intensities in three-dimensional directions, by fixing either the incident angles or light-receiving angles to a certain fixed angles. SOLUTION: A light-receiving unit 37 is rotated about a normal line (vertical axis) to the surface of a sample 24 by means of a pulse motor 31 and, in addition, is rotated in the forward and backward directions about around a prescribed horizontal axis in Fig. 1 by means of a pulse motor 34. A light source unit 29 is rotated in the forward and backward directions about the prescribed horizontal axis in Fig. 1 by means of a pulse motor 26. Rotation of the light source unit 29 about the vertical axis is substituted, by the rotation of the sample 24 about the normal line to the surface of the sample 24 by means of a pulse motor 22. Since the light source unit 29 and the light-receiving unit 37 are thus rotated and controlled separately, and as a result, this measuring instrument can measure the deformation luminous intensity by fixing either the incident angle or light-receiving angle to the certain fixed angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a goniophotometric measuring method and apparatus.

[0002]

2. Description of the Related Art For example, in pearl mica coating or raster tile, the color appears to change when the viewing direction or the light incident direction changes. For such quality control of an object, a three-dimensional variable angle photometric device is used to measure a color that changes depending on a viewing direction or a light incident direction.

FIG. 10 is a plan view showing a part of an example of a conventional variable angle photometric device, and FIG. 11 is a front view thereof. This goniophotometric device includes a sample table 1, a light source unit 2, a light receiving unit 3, and the like.
The sample table 1 has a horizontal axis 11 (see FIG. 12) as a center, and FIG.
In the above, the sample 4 is mounted on the sample mounting surface so as to be rotatable in the horizontal plane direction from the vertical position on the paper surface. In this case, the sample stage 1 fixed to the horizontal shaft 11 is rotated by driving a sample stage pulse motor (not shown). The surface of the sample 4 mounted on the sample mounting surface of the sample table 1, that is, the sample surface 12 (see FIG. 12) intersects the horizontal axis 11 which is the rotation center of the sample table 1.

The light source unit 2 is on a first circular orbit 5 centered on the center of the horizontal axis 11 in the longitudinal direction on a horizontal plane 13 (see FIG. 12) including the horizontal axis 11 which is the center of rotation of the sample table 1. It is rotatably arranged. In this case, the light source unit 2 is rotated by driving a light source unit pulse motor (not shown). Further, the incident light beam 6 emitted from the light source unit 2 toward the sample 4 is the horizontal plane 13 concerned.
Pass through.

The light receiving unit 3 has a horizontal axis 11 on a horizontal plane 13 including the horizontal axis 11 which is the center of rotation of the sample table 1.
Is rotatably arranged on the second circular orbit 7 centered on the center portion in the longitudinal direction. In this case, the light receiving unit 3 is rotated by driving a pulse motor for the light receiving unit (not shown). The received light ray 8 reflected by the sample 4 and traveling toward the light receiving unit 3 passes through the horizontal plane 13.

Here, as shown in FIG.
Is inclined counterclockwise by an angle δ with respect to a vertical plane 14 including the horizontal axis 11. Then, a normal line 15 of the sample surface 12 (hereinafter referred to as a sample surface normal line) and a horizontal plane 13 including the horizontal axis 11 (sample surface normal line 1 when δ = 0 ° described later).
The angle formed by 6) is called the sample inclination angle (orbiting angle) δ.

The angle formed by the sample surface normal 15 and the incident light beam (incident optical axis) 6 is called the incident angle i. The angle formed by the sample surface normal 15 and the received light beam (reception optical axis) 8 is referred to as the light reception angle r.
The angle formed by the sample surface normal 16 of the sample surface 12 (that is, the vertical surface 14) and the incident light ray 6 when the sample inclination angle δ = 0 ° is called the mechanical incident angle i0. The angle formed by the sample surface normal 16 and the received light beam 8 when the sample tilt angle δ = 0 ° is defined as the mechanical light receiving angle r0.
Say.

[0008] And, in this variable angle photometric device 3
The dimensional correspondence means that the measurement is performed under the incident light receiving condition such that the sample surface normal 15 is not on the plane including the incident light ray 6 and the received light ray 8, that is, the horizontal plane 13. It should be noted that this goniophotometer can also perform two-dimensional measurement. Two-dimensional measurement means sample tilt angle δ = 0 °
In this case, the measurement is performed under the incident / light receiving condition such that the sample surface normal 16 at that time is on the plane including the incident light ray 6 and the received light ray 8, that is, the horizontal plane 13.

Next, a description will be given of a case where the reflectance characteristic which changes depending on the viewing direction of the sample 4 is measured three-dimensionally by using this goniophotometer. First, the sample stage 1 is driven to a desired sample tilt angle δ by driving the sample stage pulse motor.
Fix in the position according to. Further, the fixed light source unit 2 is fixed at a position corresponding to a desired mechanical incident angle i0 by driving the light source unit pulse motor. Then, the incident light beam 6 emitted from the light source unit 2 is applied to the sample surface 12 of the sample 4.
With an incident angle i.

Next, the light receiving unit 3 is rotated by a certain angle within a desired angle range by driving the pulse motor for the light receiving unit. Then, the light receiving unit 3 is
The circular orbit 8 is rotated by a certain angle within a desired angle range, and the light receiving angle r changes. And the light receiving unit 3
Receives the received light beam 8 reflected by the sample surface 12 of the sample 4 at each rotation position thereof. As a result, the reflectance characteristics that change depending on the viewing direction of the sample 4 at the sample tilt angle δ are measured at all wavelengths or in three-dimensional correspondence for each wavelength.

Next, a case will be described in which the reflectance characteristics, which change depending on the direction of light incident on the sample 4, are measured in three dimensions. First, the sample stage 1 is fixed to a position corresponding to a desired sample inclination angle δ by driving a sample stage pulse motor. Further, the light receiving unit 3 is fixed at a position corresponding to a desired mechanical light receiving angle r0 by driving the light receiving unit pulse motor.

Next, while the light source unit 2 is emitting light, the light source unit pulse motor is driven to rotate the light source unit 2 by a certain angle within a desired angle range. Then, the light source unit 2 rotates on the first circular orbit 6 by a certain angle within a desired angle range, and the incident angle i changes. And
The light receiving unit 3 receives the received light beam 8 reflected by the sample surface 12 of the sample 4 at each rotation position of the light source unit 2. As a result, the reflectance characteristics that change due to the difference in the light incident direction on the sample 4 at the sample inclination angle δ are measured in a three-dimensional manner.

By the way, in the evaluation of the viewing angle characteristics of a reflection type liquid crystal display panel, for example, as shown in FIG. 7, the incident direction of the incident light ray 30a with respect to the display surface of the liquid crystal display panel 24 is fixed to a certain direction. It is necessary to change the light receiving angle of the received light beam 38a reflected in the direction along the outer peripheral inclined surface of the first inverted cone 42 centered on the normal 41 of the display surface of the liquid crystal display panel 24.

Further, in the evaluation of the light environment adaptation characteristics (reflection characteristics when the light source is at various positions) of the reflection type liquid crystal display panel, as shown in FIG. 8, the light receiving direction of the received light beam 38a is fixed. The angle of incidence of the incident light ray 30a incident from the direction along the outer peripheral inclined surface of the second inverted cone 43 centered on the normal 41 of the display surface of the liquid crystal display panel 24 needs to be changed. is there.

[0015]

However, in the above-mentioned conventional variable angle photometric device, when the sample tilt angle δ is changed, both the incident angle i and the light receiving angle r are changed. There is a problem that the above evaluation cannot be performed. The subject of this invention is
At least one of the incident angle and the light receiving angle is fixed to a certain angle so that the variable angle luminous intensity can be measured.

[0016]

According to a first aspect of the present invention, the incident polar angle of the light source unit with respect to the sample or the light receiving polar angle of the light receiving unit with respect to the sample is predetermined on a plane including the sample surface normal of the sample. An angle and a step of setting an incident azimuth angle to the light source unit the sample and a light receiving azimuth angle to the sample of the light receiving unit on a plane perpendicular to a sample plane normal of the sample, respectively. Including either the light source unit or the light receiving unit on a plane perpendicular to the sample plane normal line of the sample on a first circular orbit centered on the sample plane normal line, or Emit from the light source unit at a predetermined rotation position by rotating on a second circular orbit centered on the sample on a plane including the sample surface normal. The incident light is reflected by the sample, it is characterized in that the receiving light rays consisting of the reflected light is received by the light receiving unit. According to a second aspect of the present invention, in the invention according to the first aspect, the other of the light source unit and the light receiving unit is set on the plane perpendicular to the sample plane normal line of the sample, It is characterized in that it is fixed at a certain position on the third circular orbit around the center. According to a third aspect of the invention, in the invention of the second aspect, the light source unit is the third
It is fixed at a certain position on the circular orbit, and the light receiving unit is rotated on the first circular orbit. According to a fourth aspect of the invention, in the third aspect of the invention, the light receiving unit is rotated once. The invention described in claim 5 is the invention according to claim 2.
In the invention described in (4), the light receiving unit is fixed at a certain position on the third circular orbit, and the light source unit is rotated on the first circular orbit. According to a sixth aspect of the invention, in the invention according to the fifth aspect, the light source unit is rotated once. According to a seventh aspect of the present invention, in the invention according to the first aspect, any one of an incident polar angle θi and an incident azimuth angle φi of the incident light ray and a light receiving polar angle θr and a light receiving azimuth angle φr of the received light ray. Bend only one or
It is characterized by fixing the remaining three. The invention described in claim 8 is the same as the invention described in claim 1, wherein the incident polar angle θi and the incident azimuth angle φi of the incident light ray are included.
And one or two of the light receiving polar angle θr and the light receiving azimuth angle φr of the received light beam are fixed, and at least the remaining one is changed. According to a ninth aspect of the present invention, in the first aspect of the invention, the sample is rotated by a certain angle about the sample surface normal, and the incident azimuth angle φi of the incident light beam and the incident azimuth angle of the received light beam are It is characterized in that it changes the angle of φr while keeping the difference constant. According to a tenth aspect of the present invention, a sample table on which a sample is placed, a light source unit that emits an incident light beam toward the sample, and a light receiving unit that receives a received light beam that is a reflected light beam reflected by the sample. A variable angle photometric device comprising: a light source unit, wherein an incident polar angle θi of an incident light beam and an incident azimuth angle φi, and a light receiving polar angle θr and a light receiving azimuth angle φr of a received light beam of the light receiving unit are separately controlled. It is characterized in that it is provided with a means for doing. According to an eleventh aspect of the present invention, in the invention according to the tenth aspect, the means for controlling the incident polar angle θi is arranged such that the light source unit is aligned with a sample surface normal line of the sample on an extension surface of the sample surface of the sample. A means for rotating about a vertical axis, a means for controlling the incident azimuth angle φi is a means for rotating the sample stage about a sample surface normal of the sample, and controls the light receiving polar angle θr. The means is a means for rotating the light receiving unit on an extension surface of the sample surface of the sample about an axis perpendicular to the sample surface normal of the sample, and the means for controlling the light receiving azimuth angle φr is the light receiving unit. It is characterized in that it is means for rotating about the sample surface normal on a plane perpendicular to the sample surface normal of the sample. The invention described in claim 12 is claim 1
In the invention described in 0, the means for controlling the incident polar angle θi is means for rotating the light source unit on an extension surface of the sample surface of the sample about an axis perpendicular to a normal to the sample surface of the sample. The means for controlling the incident azimuth angle φi is means for rotating the light source unit about a sample surface normal on a plane perpendicular to the sample surface normal of the sample, and controls the light receiving polar angle θr. The means is means for rotating the light receiving unit on an extension surface of the sample surface of the sample about an axis perpendicular to the sample surface normal of the sample, and the means for controlling the light receiving azimuth angle φr is It is a means for rotating the sample about the normal to the sample surface. According to a thirteenth aspect of the present invention, in the tenth aspect of the present invention, the means for controlling the incident polar angle θi sets the light source unit on the extension surface of the sample surface of the sample to the sample surface normal line of the sample. Means for rotating about a vertical axis, and means for controlling the incident azimuth angle φi is means for rotating the light source unit on a plane perpendicular to the sample plane normal line of the sample about the sample plane normal line. The means for controlling the light-receiving polar angle θr is means for rotating the light-receiving unit on an extension surface of the sample surface of the sample about an axis perpendicular to the normal to the sample surface of the sample. The means for controlling the angle φr is a means for rotating the light-receiving unit on a plane perpendicular to the sample surface normal of the sample about the sample surface normal. According to the present invention, the incident polar angle of the light source unit with respect to the sample and the light receiving polar angle of the light receiving unit with respect to the sample are separately controlled to be different from each other, so that either one of the light source unit and the light receiving unit is used as the sample. It is possible to fix the other position and rotate the other by a certain angle around the sample. Therefore, at least one of the incident angle and the light receiving angle is fixed to a certain angle to measure the variable angle luminous intensity. be able to.

[0017]

1 is a front view of a main part of a variable angle photometric device as one embodiment of the present invention, and FIG. 2 is a plan view thereof. This goniophotometric device includes a base plate 21 that extends in the left-right direction in FIG. 1 and is fixedly arranged. On the upper surface of the right end portion of the base plate 21 in FIG. 1, a sample table 23 is arranged via a first incident angle controlling pulse motor 22. A sample 24 is placed on the upper surface of the sample table 23. The central axis of the first incident angle controlling pulse motor 22 is arranged on an extension of the normal to the sample surface of the sample 24.

The lower end of the fixed support column 25 is attached to the left end of the base plate 21 in FIG. The lower end of the movable support 27 is attached to the surface of the upper end of the fixed support 25 facing the sample table 23 via the second incident angle controlling pulse motor 26. The central axis of the second incident angle controlling pulse motor 26 is arranged so as to be perpendicular to the normal to the sample surface of the sample 24 on the extension surface of the sample surface of the sample 24.

A base end of a fixed arm 28 extending horizontally to the right in FIG. 1 is attached to the upper end of the movable column 27. A light source unit 29 is provided at the tip of the fixed arm 28.
Is attached. At the light emission center point 30 on the lower surface side of the lamp (not shown) of the light source unit 29, the second incident angle controlling pulse motor 26 is in the initial state, and the movable support 27
1 is located on the extension of the normal to the sample surface of the sample 24 when it is located at the vertical initial position without rotating in the front-back direction.

A base end of a movable arm 32 extending horizontally to the right in FIG. 1 is attached to the lower surface of one end of the base plate 21 via a first light-receiving angle controlling pulse motor 31. The central axis of the first pulse motor 31 for controlling the light receiving angle is arranged on an extension of the normal to the sample surface of the sample 24.

At the tip of the movable arm 32, a fixed column 33 is attached.
The lower end of is attached. The lower end of the movable support column 35 is attached to the surface of the upper end of the fixed support column 33 on the side facing the sample table 23 via the second light-receiving-angle controlling pulse motor 34. The central axis of the second pulse motor 34 for controlling the light receiving angle is arranged so as to be perpendicular to the normal to the sample surface of the sample 24 on the extension surface of the sample surface of the sample 24.

A base end of an upper fixed arm 36 that extends horizontally to the left in FIG. 1 is attached to the upper end of the movable column 35. A light receiving unit 37 is attached to the tip of the fixed arm 36. Light receiving center point 38 on the lower surface side of the diode array (not shown) of the light receiving unit 37
Is a pulse motor 31 for controlling the first and second light receiving angles,
34 is in the initial state, the movable arm 32 is located at the initial position extending in the right direction without rotating clockwise and counterclockwise in FIG. 2, and the movable column 35 does not rotate in the front-back direction in FIG. When located in the vertical initial position,
It is located on the extension of the normal to the sample surface of the sample 24.

Incidentally, even if the light receiving unit 37 system and the light source unit 29 system are rotationally moved respectively as described later,
They do not collide with each other. That is, the movable arm 32, the movable column 35, and the fixed arm 36 are shorter than the corresponding base plate 21, movable column 27, and fixed arm 28, respectively.

Here, the essential points of the configuration of the goniophotometer will be described. The light-receiving unit 37 is rotated about the sample surface normal (vertical axis) of the sample 24 by driving the first light-receiving-angle controlling pulse motor 31, and the second light-receiving-angle controlling pulse motor 34 is driven. Thus, it is rotated in the front-back direction in FIG. 1 about a predetermined horizontal axis.

The light source unit 29 is rotated in the front-rear direction in FIG. 1 about a predetermined horizontal axis by driving the first incident angle control pulse motor 26. Light source unit 29
The rotation about the vertical axis is performed by driving the second incident angle controlling pulse motor 22 so that the sample 24 rotates about the normal to the sample surface.

As described above, both the light receiving unit 37 and the light source unit 29 are substantially rotatable about the two axes of the horizontal axis and the vertical axis in order to correspond to the measurement in three dimensions.

Next, a two-dimensional measurement operation of this variable angle photometric device will be described. In the state shown in FIGS. 1 and 2, the sample surface normal is from the light source unit 29 to the sample 2
4 and the incident ray 30a emitted toward the sample 24
Receiving light beam 3 reflected by and received by the light receiving unit 37
It is on a plane including 8a and is in a measurable state in a two-dimensional correspondence.

In order to fix the incident angle, first, the light source unit 29 is rotated forward or backward in FIG. 1 by driving the second incident angle controlling pulse motor 26 to fix it at a desired rotational position. . Then, the incident light beam 30 a emitted from the light source unit 29 is made incident on the sample surface of the sample 24 from a fixed direction.

Next, the light receiving unit 37 is rotated by a certain angle within the desired angle range in the front-rear direction of FIG. 1 by driving the second light receiving angle controlling pulse motor 34 to change the light receiving angle. Then, the light receiving unit 3 receives the received light beam 38a reflected by the upper surface of the sample 24 at each rotational position.
To receive. As a result, optical characteristics such as reflectance, refractive index, and transmittance that change depending on the viewing direction of the sample 24 are measured at all wavelengths or two-dimensionally for each wavelength.

Next, when fixing the light receiving angle, first,
The light receiving unit 37 is replaced with the second light receiving angle controlling pulse motor 3
4 is rotated forward or backward in FIG. 1 to be fixed at a desired rotational position.

Next, the second incident angle controlling pulse motor 26 is driven while the light source unit 37 is emitting light, as shown in FIG.
The angle of incidence is changed by rotating it by a certain angle within a desired angle range in the front-back direction. Then, the light receiving unit 37
Receives the received light beam 38a reflected by the sample surface of the sample 24 at each rotation position of the light source unit 29. As a result, optical characteristics such as reflectance, refractive index, and transmittance that change depending on the direction of light incident on the sample 4 are measured at all wavelengths or two-dimensionally for each wavelength.

Next, the measuring operation of the variable angle photometric device in three dimensions will be described. First, the light receiving unit 37
Is rotated 90 ° counterclockwise in FIG. 2, for example, by driving the first light receiving angle controlling pulse motor 31. This state is shown in FIGS. 3 and 4. Next, the light receiving unit 37
Is rotated by a certain angle, for example, clockwise in FIG. 4 by driving the second light receiving angle controlling pulse motor 34. This state is shown in FIGS.

Next, the light source unit 29 is rotated forward or backward in FIG. 5 by driving the second incident angle controlling pulse motor 26, and is fixed at a desired rotational position. In this state, the normal to the sample surface is from the light source unit 29 to the sample 2
4 and the incident ray 30a emitted toward the sample 24
Receiving light beam 3 reflected by and received by the light receiving unit 37
It is not on the plane including 8a and is in a measurable state in three-dimensional correspondence.

Therefore, when fixing the incident angle, first, as shown in FIG. 7, the incident light beam 30a emitted from the light source unit 29 fixed at a desired position is directed in a fixed direction on the sample surface of the sample 24. Incident from. Next, the light receiving unit 37 is rotated by one angle in the clockwise direction or the counterclockwise direction in FIG. 6 by driving the first light receiving angle controlling pulse motor 31 to change the light receiving angle.

In this case, as shown in FIG. 7, the light receiving unit 37 (the light receiving center point 38 thereof) is located on any one of the outer circumference circles of the bottom surface of the first inverted cone 42 centered on the normal line 41 of the sample 24. Rotate once every angle in the direction of. Then, the light receiving unit 37 receives the received light beam 38a reflected by the sample surface of the sample 24 at each rotation position. This allows
The reflectance, the refractive index, which changes depending on the viewing direction of the sample 24,
Optical characteristics such as transmittance are measured at all wavelengths or for each wavelength in a three-dimensional manner.

Next, when the light receiving angle is fixed, the sample 24 is driven in the clockwise or counterclockwise direction in FIG. 6 by driving the first incident angle controlling pulse motor 22 while the light source unit 37 is emitting light. Rotate one angle at a time.
In other words, if the sample 24 is fixed as shown in FIG.
In 0), the incident angle is changed by rotating the outer circumference circle of the bottom surface of the second inverted cone 43 centered on the normal line 41 of the sample 24 by one angle in any direction. Then, the light receiving unit 37 fixed at a desired position receives the received light beam 38a reflected by the sample surface of the sample 24 at each rotation position of the light source unit 29. As a result, optical characteristics such as reflectance, refractive index, and transmittance that change depending on the difference in the direction of light incident on the sample 4 are measured at all wavelengths or three-dimensionally for each wavelength.

By the way, when the sample 24 is a reflection type liquid crystal display panel, in the three-dimensional correspondence measurement shown in FIG. 7, the incident direction of the incident light ray 30a with respect to the display surface of the liquid crystal display panel 24 is a certain direction. The received light beam 38 that is fixed to and is reflected in a direction along the outer peripheral inclined surface of the first inverted cone 42 centered on the normal line 41 of the display surface of the liquid crystal display panel 24.
The light receiving angle of a can be changed. Therefore, the viewing angle characteristics of the reflective liquid crystal display panel 24 can be evaluated.

In the three-dimensional correspondence measurement shown in FIG.
Fix the light receiving direction of the received light beam 38a in a certain direction,
The incident angle of the incident light ray 30a incident from the direction along the outer peripheral inclined surface of the second inverted cone 43 centering on the normal line 41 of the display surface of the liquid crystal display panel 24 can be changed. Therefore, it is possible to evaluate the light environment adaptation characteristics (reflection characteristics when the light source is located at various positions) of the reflective liquid crystal display panel 24.

In the above embodiment, the light receiving unit 3
Reference numeral 7 is rotatable about two axes, a vertical axis of the pulse motor 31 and a horizontal axis of the pulse motor 34. On the other hand, the light source unit 29 is rotatable about only one horizontal axis of the pulse motor 26, but the rotation around the vertical axis is performed by rotating the sample 24 around the vertical axis of the pulse motor 22. Is acting on your behalf.

However, without being limited to the above embodiment, for example, in FIG. 1, the arrangement position of the base plate 21 under the sample table 23 and the arrangement position of the movable arm 32 are reversed, that is, on the movable arm 32. Pulse motor 22
It is also possible to dispose the sample stand 23 via the base plate 21 and the base plate 21 below the movable arm 32 via the pulse motor 31.
In this case, the light source unit 29 can rotate about two axes and the light receiving unit 37 can rotate about one axis, but the light receiving unit 37 cannot rotate about the other axis. , The sample 24 is rotated by rotating the sample 24 around the vertical axis of the pulse motor 22.

Further, in FIG. 1, the sample table 23 may be fixed, the base plate 21 may be rotatable by the pulse motor 22, and the movable arm 32 may be rotatable by the pulse motor 31. In this case, the light source unit 29 can rotate about two axes, and the light receiving unit 37 can also rotate about two axes.

Here, the incident angle and the light receiving angle when the sample surface of the sample 24 is horizontal will be described using an angular coordinate system commonly used in the technical field of liquid crystal display panels.
As shown in FIGS. 9A and 9B, the liquid crystal display panel 24
On the display surface, the 3 o'clock direction is the X axis, the 12 o'clock direction is the Y axis, and the normal direction is the Z axis.

The incident angle and the light receiving angle are respectively represented by two kinds of angles (polar angle θ and azimuth angle φ), that is, the polar angle θ with the Z axis and the azimuth angle from the X axis to the counterclockwise direction. It is represented by φ and. In this case, the incident angle is represented by the incident polar angle θ using the subscript i.
i, the incident azimuth angle φi, and the light receiving angle is represented by the light receiving polar angle θr and the light receiving azimuth angle φr using the subscript r. Further, the conceptual variation of the polar angle θ and the azimuth angle φ is 0 ° ≦ θ ≦
90 ° and 0 ° ≦ φ ≦ 360 °.

In the above-described embodiment, the incident polar angle θi is controlled by driving the second incident angle control pulse motor 26 so that the light source unit 29 moves forward and backward in FIG. 1 together with the movable column 27 and the fixed arm 28. It is performed by rotating. The incident azimuth angle φi is controlled by driving the first incident angle control pulse motor 22.
At the same time, the sample 24 is rotated clockwise or counterclockwise in FIG.

The light-receiving polar angle θr is controlled by driving the second light-receiving angle controlling pulse motor 34 to rotate the light-receiving unit 37 together with the movable column 35 and the fixed arm 36 in the front-back direction in FIG. Light receiving azimuth φ
The control of r is performed by driving the first light receiving angle control pulse motor 31 so that the movable arm 32, the fixed support column 33, the second light receiving angle control pulse motor 34, the movable support column 35, and the fixed arm 36 are moved by the light receiving unit 37. It is performed by rotating clockwise or counterclockwise in FIG.

By the way, the goniophotometer of the above-mentioned embodiment can be used in six goniomodes, although there are some points that overlap with the above description. The first angle changing mode changes the angle of incidence polar angle θr among the above four angle coordinates,
This is a bending mode in which the remaining three angles (θi, φi, φr) are fixed.

As an example of the first angle changing mode, when the incident polar angle θi = 20 °, the incident azimuth angle φi = 90 °, and the light receiving azimuth angle φr = 270 °, the light receiving polar angle θr is changed.
It is possible to evaluate the vertical cross section of the viewing angle characteristics of the reflective liquid crystal display panel. In this case, the variable range of the light receiving polar angle θr is 10 ° to 77 °.

As another example of the first variable angle mode, the incident polar angle θi = 20 °, the incident azimuth angle φi = 90 °,
When the light receiving azimuth angle φr = 0 ° and the light receiving polar angle θr is changed, the left and right cross-sections of the viewing angle characteristics of the reflective liquid crystal display panel can be evaluated. In this case, the variable range of the light receiving polar angle θr is 10 ° to 77 °.

Next, in the second variable angle mode, only the light receiving azimuth angle φr of the above four angular coordinates is changed, and the remaining three angles (θi, φi, θr) are fixed. It is a corner mode. As an example, when the incident light polar angle θi = 20 °, the incident azimuth angle φi = 90 °, the light receiving polar angle θr = 45 °, and the light receiving azimuth angle φr is changed, the inverse cone of the viewing angle characteristic of the reflective liquid crystal display panel is obtained. The cross section can be evaluated. In this case, the variable range of the light receiving azimuth angle φr is 0 ° to 73 ° and 107 ° to 360 °.

Next, in the third variable angle mode, only the incident azimuth angle φi of the above four angular coordinates is changed and the remaining three angles (θi, θr, φr) are fixed. It is a corner mode. As an example, when the incident azimuth angle φi is changed with the incident polar angle θi = 20 ° and the light receiving polar angle θr = 45 ° (the incident azimuth angle φr is not defined), JEITA EIA
It is possible to simulate the omnidirectional (ring) parallel light irradiation method (configuration B) specified in JED-2523 “Reflective Liquid Crystal Display Module Measuring Method”. In this case, the variation range of the incident azimuth angle φi is 0 ° to 360 °.

The fourth variable angle mode is a variable angle mode in which the above four angles (θi, θr, φi, φr) can be arbitrarily set. The first of this fourth bending mode
As an example, if the incident polar angle θi and the incident azimuth angle φi are two-dimensionally changed with the light receiving polar angle θr = 0 ° (the light receiving azimuth angle φr is not defined), JEITA EIAJE
It is possible to simulate the partial diffusion irradiation method (configuration C) defined in D-2523 “Measuring method for reflective liquid crystal display module”. In this case, the variable range of the incident polar angle θi is 0 ° to 45 °, and the variable range of the incident azimuth angle φi is 0 ° to 360 °.

As a second example of the fourth variable angle mode,
With the light receiving polar angle θr = 0 ° (the light receiving azimuth angle φr is not defined), the incident polar angle θi and the incident azimuth angle φi are 2
If you change the dimension, JEITA EIAJ ED-2
It is possible to simulate the partial diffusion irradiation method (configuration D) defined in 523 “Measurement method for reflective liquid crystal display module”. In this case, the variable range of the incident polar angle θi is 0 ° to 77 °, and the variable range of the incident azimuth angle φi is 0 °.
˜360 °.

As a third example of the fourth bending mode,
The light receiving polar angle θr = 2 ° and the light receiving azimuth angle φr = 270 °,
When the incident polar angle θi and the incident azimuth angle φi are two-dimensionally changed, measured values (luminance, chromaticity) in an arbitrary light environment can be simulated. In this case, the changeable range of the incident polar angle θi is 0 ° to 77 °, and the changeable range of the incident azimuth angle φi is 0 ° to 253 ° and 287 ° to 360 °.

Next, in the fifth angle changing mode, only the incident polar angle θi of the above four angle coordinates is changed and the remaining three angles are set.
This is a variable angle mode in which one angle (θr, φi, φr) is fixed. The sixth angle changing mode is a angle changing mode in which the sample 24 is rotated about the normal to the sample surface and the angle is changed while keeping the difference between the incident azimuth angle φi and the light receiving azimuth angle φr constant.

[0055]

As described above, according to the present invention, the incident light polar angle of the light source unit with respect to the sample and the light receiving polar angle of the light receiving unit with respect to the sample are separately controlled to be different from each other. It is possible to fix one of the light receiving units at a certain position with respect to the sample and rotate the other at a certain angle around the sample, so at least one of the incident angle and the light receiving angle is set to a certain angle. It can be fixed and the goniophotometric value can be measured.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a variable angle photometric device as an embodiment of the present invention.

FIG. 2 is a plan view of the goniophotometer shown in FIG.

FIG. 3 is a front view showing a state in which the light receiving unit system of the goniophotometer shown in FIG. 1 is rotated 90 ° in a predetermined direction on a horizontal plane.

4 is a plan view of the goniophotometer shown in FIG.

5 is a front view of a state in which a part of the light receiving unit system of the goniophotometric device shown in FIG. 3 is rotated by a certain angle in a vertical plane.

FIG. 6 is a plan view of the goniophotometer shown in FIG.

7 is a perspective view shown for explaining a case where the light source unit is fixed at a certain position and the light receiving angle is changed in the variable angle photometric device shown in FIGS. 5 and 6. FIG.

8 is a perspective view shown for explaining a case where a light receiving unit is fixed at a certain position to change an incident angle in the variable angle photometric device shown in FIGS. 5 and 6. FIG.

9A and 9B are views shown for explaining an angular coordinate system which is commonly used in the technical field of liquid crystal display panels.

FIG. 10 is a plan view of a part of an example of a conventional goniophotometer.

FIG. 11 is a front view of the goniophotometer shown in FIG.

FIG. 12 is a perspective view shown for explaining terms such as a sample inclination angle in the variable angle photometric device shown in FIGS. 10 and 11.

[Explanation of symbols]

22 First Pulse Motor for Incident Angle Control 23 sample table 24 samples 26 Second Pulse Motor for Incident Angle Control 29 Light source unit 31 First Pulse Angle Controlling Motor 34 Second Light-Reception-Angle Control Pulse Motor 37 Light receiving unit

Claims (13)

[Claims] 1. A step of setting an incident polar angle of a light source unit with respect to the sample or a light receiving polar angle of the light receiving unit with respect to the sample on a plane including a sample surface normal of the sample, and a sample plane method of the sample. A step of setting an incident azimuth angle of the light source unit to the sample and a light receiving azimuth angle of the light receiving unit to the sample on a plane perpendicular to a line, respectively, one of the light source unit and the light receiving unit. On a plane perpendicular to the sample plane normal of the sample on a first circular orbit centered on the sample plane normal, or centering the sample on a plane containing the sample plane normal of the sample And rotating on a second circular orbit, and at a predetermined rotation position, the incident light beam emitted from the light source unit is reflected by the sample, A variable-angle light intensity measuring method, wherein a light-receiving light beam including reflected light is received by the light-receiving unit. 2. The invention according to claim 1, wherein the other of the light source unit and the light receiving unit is centered on the sample surface normal line on a plane perpendicular to the sample surface normal line of the sample. A method for measuring goniophotometry, which is characterized in that it is fixed at a certain position on the circular orbit 3 of FIG. 3. The invention according to claim 2, wherein the light source unit is fixed at a certain position on the third circular orbit,
A goniophotometric measuring method, characterized in that the light receiving unit is rotated on the first circular orbit. 4. The variable-angle photometric method according to claim 3, wherein the light receiving unit is rotated once. 5. The invention according to claim 2, wherein the light receiving unit is fixed at a position on the third circular orbit,
A variable angle photometric method characterized in that the light source unit is rotated on the first circular orbit. 6. The variable angle photometric method according to claim 5, wherein the light source unit is rotated once. 7. The invention according to claim 1, wherein only one of an incident polar angle θi and an incident azimuth angle φi of the incident light ray and a light receiving polar angle θr and a light receiving azimuth angle φr of the received light ray. And the other three are fixed. 8. The invention according to claim 1, wherein any one of an incident polar angle θi and an incident azimuth angle φi of the incident light beam and a light receiving polar angle θr and a light receiving azimuth angle φr of the received light beam, or A method for measuring goniophotometry, characterized in that two are fixed and at least one of the remaining is gonio. 9. The invention according to claim 1, wherein the sample is rotated by a certain angle about the sample surface normal, and the incident azimuth angle φi of the incident light beam and the incident azimuth angle φr of the received light beam are A gonio-photometric method characterized by diverting while maintaining a constant difference. 10. A modification comprising: a sample table on which a sample is placed; a light source unit that emits an incident light beam toward the sample; and a light receiving unit that receives a received light beam composed of reflected light reflected by the sample. An angular luminosity measuring device, comprising means for separately controlling an incident polar angle θi and an incident azimuth angle φi of an incident light beam of the light source unit, and a light receiving polar angle θr and a light receiving azimuth angle φr of a received light beam of the light receiving unit. A variable angle photometric device characterized in that 11. The invention according to claim 10, wherein the means for controlling the incident polar angle θi has the axis of the light source unit on the extension surface of the sample surface of the sample, the axis being perpendicular to the normal to the sample surface of the sample. A means for rotating the sample stage, a means for controlling the incident azimuth angle φi, a means for rotating the sample stage about a sample surface normal of the sample, and a means for controlling the light receiving polar angle θr. A unit for rotating the unit on an extension of the sample surface of the sample about an axis perpendicular to the normal to the sample surface of the sample, the light receiving azimuth angle φr
The means for controlling the light receiving unit is means for rotating the light receiving unit on a plane perpendicular to the sample surface normal line of the sample about the sample surface normal line, as a center. 12. The invention according to claim 10, wherein the means for controlling the incident polar angle θi has an axis perpendicular to the sample surface normal of the sample on the extension surface of the sample surface of the light source unit. A means for rotating the light source unit on a plane perpendicular to the normal to the sample surface of the sample, and a means for controlling the incident azimuth angle φi. The means for controlling the light-receiving polar angle θr is a means for rotating the light-receiving unit on an extension surface of the sample surface of the sample about an axis perpendicular to the normal to the sample surface of the sample, and controls the light-receiving azimuth angle φr. The means for rotating is a means for rotating the sample stage around the sample surface normal of the sample as a center. 13. The invention according to claim 10, wherein the means for controlling the incident polar angle θi is arranged such that the light source unit has an axis perpendicular to the sample surface normal line of the sample on an extension surface of the sample surface of the sample. A means for rotating the light source unit on a plane perpendicular to the normal to the sample surface of the sample, and a means for controlling the incident azimuth angle φi. The means for controlling the light-receiving polar angle θr is a means for rotating the light-receiving unit on an extension surface of the sample surface of the sample about an axis perpendicular to the normal to the sample surface of the sample, and controls the light-receiving azimuth angle φr. The means for rotating the light receiving unit is a means for rotating the light receiving unit on a plane perpendicular to the normal to the sample surface of the sample about the normal to the sample surface as a center.