JP5350906B2 - Optical directivity measurement device - Google Patents

Description

  The present invention relates to an apparatus for measuring optical directivity characteristics of a light emitting device such as an LED.

  In recent years, light-emitting devices using semiconductor elements such as LEDs have come into the limelight as next-generation lighting fixtures with less environmental impact in place of conventional filament bulbs and fluorescent lamps, and many products have begun to be marketed. Along with this, many measurement techniques for inspecting the characteristics of products have been proposed.

  For example, a light emitting device using a semiconductor element such as an LED (hereinafter referred to as a “light emitting device”) is gripped by the positioning means of the detection / measuring means, and the front light from the light emitting device is received and detected by the detecting unit of the detecting / measuring means. A technique for obtaining light emission characteristics in a measuring section of a measuring means has been disclosed. (For example, see Patent Document 1)

  In this technical disclosure, there is a drawback that light from the side surface of the light emitting device is not detected and accurate measurement cannot be performed. Therefore, a reflecting surface is provided on the positioning means for gripping the light emitting device, and light from the side surface of the light emitting device is used as a detection unit. Techniques have been disclosed that reflect to improve measurement accuracy. (For example, see Patent Document 2)

  In another technical disclosure, the relative position between the light emitting device and the light receiving device is changed in various ways, the light from the light emitting device is measured over a wide range, and a large amount of the obtained data is processed to obtain the optical characteristics of the light emitting device. Measurement system technology is also disclosed. (For example, see Non-Patent Document 1)

JP 2000-180122 A (Claims, Fig. 2) Japanese Patent Laying-Open No. 2006-30135 (Claims, Fig. 1)

Toshihide Iwanaga, 2 others, “Development of optical characteristic measurement system for LED module for lighting”, Tokyo Metropolitan Industrial Technology Research Center Research Report, No. 2, 2007, p. 34-p. 37

  Since a light emitting device using a semiconductor element has a light emission mechanism different from that of a conventional illumination element, a method suitable for the principle of semiconductor light emission is required for measuring light emission characteristics such as illuminance, total luminous flux, and directivity.

In other words, in a light emitting device using semiconductor technology, the light emission intensity has a temperature characteristic peculiar to a semiconductor, that is, the characteristic that the light emitting characteristic changes due to the ambient temperature or the temperature rise of the light emitting device itself is sufficient for measurement. Must be considered.
For example, in directivity measurement, which is the most important element of a luminaire, it is necessary to allow a wide range of measurements in a short time in order to prevent uncertain measurements due to temperature changes.

  Since the disclosed technique of Patent Document 1 detects only light from the front surface of the light emitting device, perfect optical directivity characteristics cannot be obtained. Further, in the disclosed technique of Patent Document 2, light from the side surface of the light emitting device also enters the detection unit by the reflection surface, but the light reaching the light reception unit is limited by the angle of the reflection surface, so that complete directivity characteristics are obtained. Therefore, it is necessary to change the angle of the detection unit, which takes time for measurement.

  Although the disclosed technique of Non-Patent Document 1 can measure light in all directions from the light emitting device, the measurement time is shorter and improved than the disclosed technique of Patent Document 2, but in principle one-dimensional measurement. Since it is a method of obtaining two-dimensional information by repeating the above, it takes a certain amount of time, and measurement errors due to temperature rise cannot be avoided. In addition, cost increases such as complicated devices and maintenance of movable parts such as motors become a major obstacle to widespread use.

  As described above, when the optical directivity characteristic of the light emitting device is measured by a known technique, it takes a long time for the measurement. As a result, the measurement becomes inaccurate due to the temperature rise of the light emitting device, and the measuring device itself. There was a problem that the cost of

  The object of the present invention is to solve the above-mentioned problems, ensure high accuracy by measuring light in all directions from the light-emitting device in a very short time and suppressing the temperature rise of the light-emitting device itself, and having no moving parts. It is to provide a low-cost optical directivity characteristic measuring apparatus with a simple structure and little maintenance.

  In order to solve the above problems, the optical directivity characteristic measuring apparatus of the present invention employs the following configuration.

The optical directivity characteristic measuring apparatus of the present invention is
The light-emitting device 3 that is the object to be measured, the reflecting means 2 that reflects the light from the light-emitting device 3, the light-receiving device 5n that detects the light from the light-emitting device 3 that is reflected from the reflecting means 2, and the light-receiving device 5n In the light emission characteristic measuring apparatus 1 having the data processing means 10 for calculating the light emission characteristic of the light emitting device 3 based on the signal output Sn,
The reflecting means 2 is a screen 2 having a curved or concave reflecting surface 2 a, and the light emitting device 3 is disposed at a substantially central position on the reflecting surface 2 a side of the screen 2, and a plurality of light receiving devices are provided in the vicinity of the light emitting device 3. 5n,
The data processing means 10 includes a light emission characteristic calculation unit 70 that calculates light emission characteristic data D3 that is a light emission characteristic of the light emitting device 3 based on light reception signal outputs Sn of the plurality of light receiving devices 5n.

  As a result, light in all directions of the light emitting device 3 is collectively measured, and the total light emission characteristic is calculated from the obtained light reception signal outputs Sn. Therefore, the measurement time is shortened and the temperature rise is minimized. In addition, it is possible to measure the optical directional characteristics with high accuracy. Also, the structure is simple with no moving parts.

  The plurality of light receiving devices 5n may be arranged around the light emitting device 3 at equal intervals.

  As a result, light in all directions of the light emitting device 3 is evenly received by the plurality of light receiving devices 5n arranged at equal intervals around the light emitting device 3, so that the concentration of light on the specific light receiving device 5n is eliminated. High-precision measurement of optical directivity characteristics is possible.

  The light receiving surfaces 5na of the plurality of light receiving devices 5n may be inclined with respect to the light emitting surface 3a of the light emitting device 3 by a predetermined angle θ.

  As a result, the light in all directions of the light emitting device 3 is reflected by the reflecting surface 2a of the screen 2 and efficiently concentrated on the light receiving device 5n, so that the optical directivity characteristics can be measured with high accuracy.

  Further, a fisheye lens 4n may be provided on each light receiving surface 5na of the plurality of light receiving devices 5n.

  Thereby, the light in all directions of the light emitting device 3 is reflected by the reflecting surface 2a of the screen 2, and is efficiently concentrated on the light receiving device 5n by the fisheye lens 4, so that the optical directivity characteristic can be measured with high accuracy.

  Further, the light receiving device 5n may be an image sensor device.

  As a result, the light receiving device 5n can collectively receive the light in each direction and collectively output a light reception signal corresponding to the light in each direction, thereby shortening the measurement time.

  According to the present invention, since the optical directivity characteristics of the light emitting device are measured in a short time, there is no decrease in accuracy due to temperature rise, and there is no moving part in the measuring device, so maintenance is also low cost and high accuracy optical. A directivity measurement apparatus can be provided.

It is sectional drawing of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a typical side view of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a typical top view of a 1st embodiment of an optical directivity characteristic measuring device by the present invention. It is a light ray figure in a 1st embodiment of an optical directivity characteristic measuring device by the present invention. 1 is a block diagram of a first embodiment of an optical directivity characteristic measuring apparatus according to the present invention. It is a flowchart of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 1st Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is sectional drawing of 2nd Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a block diagram of 2nd Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a flowchart of 2nd Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 2nd Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a chart for demonstrating operation | movement of 2nd Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a typical top view of 3rd Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a typical top view of 4th Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is sectional drawing of 5th Embodiment of the optical directivity characteristic measuring apparatus by this invention. It is a light ray figure in a 5th embodiment of an optical directivity characteristic measuring device by the present invention. It is sectional drawing of the prior art example of an optical directivity characteristic measuring apparatus.

  The general operation of the optical directivity measuring apparatus of the present invention is to fix the light emitting device to the measurement stage, supply drive power to emit light, and reflect this light by the reflective surface of the screen provided above the light emitting device. In addition, the reflected light is concentrated on a plurality of light receiving devices provided in the vicinity of the light emitting device, and the signal output of the plurality of light receiving devices is calculated and processed by the data processing means. Is to measure.

  In addition, reference light source data of a reference light source with uniform directivity is stored in advance, and the light emission characteristic data of the light emitting device is corrected with the reference light source data, thereby causing variations in reflection characteristics of the reflective surface of the screen, and of a plurality of light receiving devices. A technique is adopted that minimizes factors that cause errors, such as sensitivity variations, fluctuations in the distance between the light emitting device and the screen, or the distance between the screen and the light receiving device.

[Principle description of the present invention: FIGS. 4 and 21]
Here, how the light intensity distribution in all directions of the light-emitting device, that is, the optical directional characteristic data can be measured at once by the mechanism, will be described with reference to FIG. 4 and FIG. Detailed description.

  FIG. 21 is a schematic cross-sectional view of the “light emission characteristic measurement system” shown in Non-Patent Document 1. The light emitting device 3 is set on the measurement stage 6, and the measurement stage 6 is for tilting with the XY slide unit 15. The motor 16 and the rotation motor 18 can move in the XY direction 15a, the tilt direction 16a, and the rotation direction 18a, and the posture of the light emitting device 3 set on the measurement stage 6 is changed by moving these movable parts. Thus, the azimuth angle of the light of the light emitting device 3 entering the light receiver 19 is changed variously, and light in all directions is sequentially measured by the light receiver 19 and the spectroscope 14 to obtain the light emission characteristics of the light emitting device 3.

  That is, in the conventional example shown in FIG. 21, the light receiver 19 for receiving the light of the light emitting device 3 is constituted by one optical sensor, and can measure only the intensity of light in a certain direction. For example, it is necessary to set the angle of 3 from −90 degrees to +90 degrees in steps of 0.5 degrees to several degrees and measure the light intensity each time. That is, it takes a lot of time to measure all directions.

  FIG. 4 is a ray diagram of the first embodiment of the optical directivity measuring apparatus according to the present invention. Light in each direction of the light emitting device 3 is reflected by the reflecting surface 2 a of the screen 2 and is provided in the vicinity of the light emitting device 3. A typical route until the two light receiving devices 5n are gathered is shown.

  In FIG. 4, the two light receiving devices 5n for receiving the light of the light emitting device 3 include image sensor devices such as solid-state imaging devices and CMOS devices having hundreds of thousands to millions of pixels (not shown). Is used. For example, in the case of one million pixels, a photosensor exists in each of the mesh-like sections of 1000 × 1000 = 10 million, which is divided into 1000 on one side and 1000 on the other side.

  That is, as shown in FIG. 4, the light in each direction from the light emitting device 3 is reflected by the reflecting surface 2a of the screen 2, and enters one million pixels of the image sensor device.

Further, the signal of 1 million pixels of the image sensor device can be taken out in an extremely short time of about 10 5 to the 4th power by an electronic circuit method. Then, by preliminarily conducting a preliminary experiment or the like using a standard light bulb or the like, it is possible to know the light intensity distribution in each direction by making a table showing from which direction the signal of each pixel corresponds.
For the reasons as described above, the light intensity in each direction of the light emitting device 3 can be measured in a lump.

  Hereinafter, embodiments of the optical directivity measuring apparatus of the present invention will be described in detail with reference to the drawings.

[Description of All Drawings of First Embodiment: FIGS. 1 to 11]
Hereinafter, the first embodiment of the optical directivity measuring apparatus of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a cross-sectional view of the optical directivity measuring apparatus 1, FIG. 2 is a side view schematically showing the positional relationship from the side of the screen 2, the light emitting device 3, and the light receiving device 5n. 4 is a plan view schematically showing a positional relationship from the upper surface of the screen 2 with respect to the light emitting device 3 and the light receiving device 5n, and FIG. 4 is a light ray diagram showing a light path from the light emitting device 3 to the light receiving device 5n. 5 is a block diagram of the data processing means 10, FIG. 6 is a flowchart showing a measurement flow of the optical directivity characteristic measuring apparatus 1, and FIGS. 7 to 10 are intermediate stages calculated in the course of data processing. FIG. 11 is an example of optical directivity characteristic data D4 that is a final measurement result.

[Configuration of First Embodiment: FIGS. 1 to 5]
First, the configuration of the optical directivity characteristic measuring apparatus 1 according to the present invention will be described with reference to FIGS.
In FIG. 1, the light emitting device 3 is set on the measurement stage 6 with the light emitting surface 3a facing right above, and is electrically connected to the data processing means 10 by a power terminal 8, a spring electrode 8a, and a power supply cable 10a.

The screen 2 has a spherical or parabolic curved surface, and has a reflecting surface 2a on the inner side, that is, on the light emitting device 3 side, as shown in FIG.
The reflection surface 2a is subjected to a surface treatment such as aluminum vapor deposition, and has a so-called mirror surface structure in which the reflectivity is high regardless of the wavelength of light and the reflection angle of light accurately depends on the incident angle.

The light receiving device 5n is an image sensor device such as a solid-state imaging device or a CMOS device having hundreds of thousands to millions of pixels for receiving a wide range of light from the light emitting device 3, as shown in FIG. Two are installed at symmetrical positions with respect to the light emitting device 3 and are inclined at a predetermined angle from the vertical line.
The support base 9 is a housing that fixes and holds each structure such as the measurement stage 6.

  The data processing means 10 is, for example, a personal computer and a set of power sources controlled by the personal computer, and controls the power supply to the light emitting device 3 using the power supply cable 10a, and from the two light receiving devices 5n by the signal cable 10b. Is received, and data processing for calculating the optical directivity characteristic data D4 of the light emitting device 3 is performed based on these received light signal outputs Sn.

Next, the positional relationship among the screen 2, the light emitting device 3, and the light receiving device 5n will be described with reference to FIGS.
FIG. 2 schematically shows the arrangement of the screen 2, the light emitting device 3, and the light receiving device 5n from the side, and the point P is the center position of the light emitting device.

In FIG. 2, a line segment L is a line segment that passes through the center of the light emitting surface 3a of the light emitting device 3 and is perpendicular to the light emitting surface, that is, the optical axis, and the line segments K1 and K2 are the light receiving surfaces of the two light receiving devices 5n. A line segment passing through the center of 5na and perpendicular to the light receiving surface 5n, that is, the optical axis. The “optical axis” is defined as “a line passing through the center of the light emitting surface or the light receiving surface and perpendicular to the light emitting surface or the light receiving surface”.
As shown in FIG. 2, the diameter of the screen 2 is 2r, and the point O is the center of the screen 2.

In FIG. 2, the light emitting device 3 is installed in the vicinity of the center of the screen 2 on the reflecting surface 2 a side with the light emitting surface 3 a directly above. The two light receiving devices 5n are installed such that each light receiving surface 5na is inclined at a predetermined angle θ with respect to the light emitting surface 3a of the light emitting device 3.
The reason why the two light receiving devices 5n are installed at a predetermined angle θ with respect to the light emitting surface 3a of the light emitting device 3 will be described in detail in [Description of the operation of the optical directivity measuring device 1 of the present invention].

  FIG. 3 schematically shows the arrangement of the screen 2, the light emitting device 3, and the two light receiving devices 5 n as viewed from above. The two light receiving devices 5 n are arranged on the reflecting surface 2 a side (the back side of the drawing) of the screen 2. Are arranged symmetrically on both sides of the light emitting device 3.

  FIG. 4 is a ray diagram, and shows a light path, that is, a typical path of a light beam when the light emitted from the light emitting device 3 is reflected by the reflecting surface 2a of the screen 2 and converges on the two light receiving devices 5n. ing. Details will be described later.

Next, the configuration of the data processing apparatus 10 will be described with reference to FIG.
5, the data processing apparatus 10 includes two light distribution data calculation units 6n, a light emission characteristic calculation unit 70, a light emission characteristic data storage unit 71, a correction data storage unit 71b, an optical directivity characteristic calculation unit 72, and an optical directivity characteristic display. The unit 73 and the power control unit 74 are configured.

  The two light distribution data calculation units 6n calculate the light intensity in each direction from the information of each pixel of the light reception signal output Sn output by the light receiving device 5n, and calculate the two light distribution data Dn. The “light distribution data” is defined as “light intensity distribution map by direction”.

The light emission characteristic calculation unit 70 calculates light emission characteristic data D3 that is a total light emission characteristic of the light receiving device 3 from the two light distribution data Dn calculated by the two light distribution data calculation units 6n.
In other words, since the two light distribution data Dn are partial light distribution data based on the two light reception signal outputs Sn, the light emission characteristic calculation unit 70 combines the two light distribution data Dn to obtain the light emitting device 3. The light emission characteristic data D3, which is the light emission characteristic in all directions, is calculated.

  The light emission characteristic data storage unit 71 is a buffer that temporarily stores the light emission characteristic data D3 calculated by the light emission characteristic calculation unit 70 for later calculation.

  The correction data storage unit 71b stores correction data D3b created based on past experimental data and knowledge, and is used when correcting the light emission characteristic data D3.

  The optical directivity characteristic calculation unit 72 uses the light emission characteristic data D3 of the light emitting device 3 stored in the light emission characteristic data storage unit 71 and the correction data D3b stored in the correction data storage unit 71b to determine the optical characteristics of the light emitting device 3 that is the final objective. Directivity characteristic data D4 is calculated. More specifically, the light emitting characteristic data D3 of the light emitting device 3 is corrected based on experimental data, knowledge, etc. to calculate the optical directivity characteristic data D4 of the light emitting device 3.

  The optical directivity characteristic display unit 73 visually displays the optical directivity characteristic data D4 of the light emitting device 3 output from the optical directivity characteristic calculation unit 72 and outputs a printed matter.

  The power supply controller 74 is a drive power supply having a control function such as turning on or off the light emitting device 3.

[Description of Operation of First Embodiment: FIGS. 1 to 11]
Next, operation | movement of the optical directivity characteristic measuring apparatus 1 of this invention is demonstrated using FIGS.
In FIG. 1, when the light emitting device 3 is installed on the mounting table 6a of the measurement stage 6, and the driving power is supplied from the data processing means 10 by the power terminal 8, the spring electrode 8a and the power supply cable 10a, the light emitting device 3 emits light.

  Then, as shown in FIG. 4, the light of each direction from the light-emitting device 3 is reflected by the reflective surface 2a of the screen 2, and is collected by the two light-receiving devices 5n. More specifically, as shown in FIG. 2, the curved surface of the screen 2 is spherical with a diameter of 2r, and the center position P point of the light emitting device 3 is slightly offset from the center O point of the screen 2 toward the reflecting surface 2 a. Therefore, the light emitted from the light emitting device 3 is dispersed almost equally about the optical axis L of the light emitting device 3, and after being reflected by the reflecting surface 2a of the screen 2, it is again in the vicinity of the two light receiving devices 5n. It follows the path of convergence. Note that the ray diagram of FIG. 4 shows typical rays of light, and of course there are countless rays other than these.

  As shown in FIG. 4, the typical angle of the light beam that converges in the vicinity of the light receiving device 5n is inclined by a certain angle with respect to the vertical line. On the other hand, as shown in FIG. 2, each light-receiving surface 5na of the light-receiving device 5n is inclined at a predetermined angle θ with respect to the light-emitting surface 3a of the light-emitting device 3, so that light in each direction of the light-emitting device 3 is more widely and efficiently received. It collects on each 5n light-receiving surface 5na.

  In this way, light in each direction from the light emitting device 3 enters the two light receiving devices 5n, and the two light receiving devices 5n each generate a light reception signal output Sn as shown in FIG. The two received light signal outputs Sn are respectively input to the two light distribution data calculating units 6n, and the light distribution data calculating unit 6n outputs two light distribution data Dn.

  Next, a process in which the light emission characteristic calculation unit 70 of the data processing unit 10 shown in FIG. 5 calculates the light emission characteristic data D3 will be described in detail with reference to FIGS. Please refer to FIG. 4 and FIG.

7 to 10 are data diagrams showing the intensity distribution of light in each direction of the light emitting device 3.
First, the contents of FIGS. 7 to 10 will be described. 7 to 10, the horizontal axis represents the azimuth or angle of light from -90 degrees to +90 degrees, -90 degrees represents the horizontal direction of the extension of the light emitting surface 3a of the light emitting device 3 shown in FIG. The degree indicates the opposite horizontal direction, and 0 degree indicates the optical axis direction of the light emitting surface 3a of the light emitting device 3, that is, the vertical direction. The vertical axis indicates the intensity of light in each direction of the light emitting device 3 as a relative value.

  First, the solid line d1x in FIG. 7 is the intensity distribution data Dn of light on the left side toward the optical axis L of the light emitting device 3 shown in FIG. 4 (hereinafter referred to as “(left) light distribution data Dn”). The light receiving signal output Sn output from the left light receiving device 5n of the two light receiving devices 5n shown in FIG. 4 is input to one light distribution data calculating unit 6n as shown in FIG. It is calculated by the data calculation unit 6n.

  As described above, the (left) light distribution data Dn indicates the light intensity distribution in a state where the left-side light beam is dominant toward the optical axis L of the light emitting device 3, and is indicated by a solid line d1x in FIG. In the same manner, the relative intensity of light with an azimuth angle of −90 degrees to 0 degrees is strong, and the relative intensity of light with an azimuth angle of 0 degrees to +90 degrees is weak.

  In addition, a dotted line d1y in FIG. 7 indicates the relative intensity of light on the measurement surface perpendicular to the measurement surface of (left) light distribution data Dn. This relationship will be described in detail with reference to FIG.

  That is, FIG. 8 shows the case where the (left) light distribution data Dn of the light emitting device 3 is measured along one measurement surface, and the light receiving device along a measurement surface perpendicular to the measurement surface, that is, perpendicular to the paper surface of FIG. 5n also shows two results when measured by moving 90 degrees on a vertical measurement surface, and the solid line dx is light distribution data measured along the surface shown in FIG. 4 (left). The dotted line dy indicates the light distribution data measured along a plane perpendicular to the dotted line dy. If the light emitting device 3 is manufactured symmetrically, the two coincide with each other, but it can be seen that there is a slight characteristic deviation in the light distribution data Dn due to the slightly non-uniformity of the structure that actually exists. This deviation in characteristics is ignored if it is small considering the measurement accuracy.

  Next, a solid line d2x in FIG. 9 shows intensity distribution data Dn of light on the right side toward the optical axis L of the light emitting device 3 shown in FIG. 4 (hereinafter referred to as “(right) light distribution data Dn”). The light receiving signal output Sn output from the right light receiving device 5n of the two light receiving devices 5n shown in FIG. 4 is input to the other light distribution data calculating unit 6n as shown in FIG. Calculated by the light distribution data calculation unit 6n.

  As shown in FIG. 9 (right), the light distribution data Dn indicates the light intensity distribution in a state where the right-side light beam dominates toward the optical axis L of the light emitting device 3, and therefore, the solid line d2x in FIG. As shown by, the relative intensity of light with an azimuth angle of −90 degrees to 0 degrees is weak, and the relative intensity of light with an azimuth angle of 0 degrees to +90 degrees is strong.

  The dotted line d2y in FIG. 9 is the same as in FIG.

  Further, FIG. 10 is an example of the light emission characteristic data D3 calculated by the light emission characteristic calculation unit 70 shown in FIG. That is, the light emission characteristic calculation unit 70 combines these two signals from the (left) light distribution data Dn and the (right) light distribution data Dn to emit light characteristic data that is the intensity distribution of light in all directions of the light emitting device 3. D3 is calculated.

  A dotted line d3y in FIG. 10 is data on a measurement surface orthogonal to the measurement surface of the light emission characteristic data D3, and the light emission characteristic is slightly shifted due to the asymmetry of the structure slightly present in the light emitting device 3. If the measurement accuracy is small, it will be ignored.

Next, FIG. 11 shows optical directivity characteristic data D4 of the light emitting device 3 which is the final object.
That is, in FIG. 11, the dotted line is the light emission characteristic data D3 before correction calculated by the light emission characteristic calculation unit 70 shown in FIG. 5 and stored in the light emission characteristic data storage unit 71, and the solid line is stored in the correction data storage unit 71b. This is optical directivity characteristic data D4 after being corrected by the correction data D3b.

  The correction data D3b includes measurement errors such as temperature dependency of the light emitting device 3, variation in reflection characteristics of the reflection surface 2a of the screen 2, and variation in sensitivity due to the incident angle of light on the light reception surface 5na of the light reception device 5n. In addition to various connected fluctuation factors, the relative intensity of light (d1y, d2y, d3y shown by the dotted lines in FIGS. 7 to 10) on other measurement surfaces orthogonal to the measurement surface is evaluated. Correction items such as taking an average are also included.

[Description of Measurement Flow of First Embodiment: FIGS. 6 and 1 to 5]
FIG. 6 shows a flowchart of the optical directivity characteristic measuring apparatus of the present invention described above. Hereinafter, the flow of measurement will be described in detail in comparison with the operation of the components of the data processing means 10 shown in FIG.

[Light emitting device light emission step]
The light emitting device 3 is set on the mounting table 6a of the measurement stage 6 shown in FIG. 1, and the driving power source V is supplied from the data processing means 10 to cause the light emitting device 3 to emit light. (ST10)

[Light emission characteristic data calculation step]
Based on the light reception signal outputs Sn of the two light receiving devices 5n shown in FIG. 5, the two light distribution data calculating sections 6n calculate (left) light distribution data Dn and (right) light distribution data Dn, respectively, and emit light characteristics. The calculation unit 70 calculates light emission characteristic data D3 based on (left) light distribution data Dn and (right) light distribution data Dn. (ST20)

[Light emission characteristic data storage step]
The light emission characteristic data storage unit 71 shown in FIG. 5 temporarily stores the light emission characteristic data D3 for later calculation. (ST30)

[Optical directivity calculation step]
The optical directivity characteristic calculation unit 72 shown in FIG. 5 corrects the light emission characteristic data D3 stored in the light emission characteristic data storage unit 71 with the correction data D3b stored in the correction data storage unit 71b to calculate the optical directivity characteristic data D4. . (ST40)

[Effect of the first embodiment]
As described above, since the measurement of the optical directivity characteristic data D4 is performed very quickly and without any moving part, it can be said that it is remarkably superior in the measurement of an element such as a semiconductor that has a large characteristic change due to a temperature rise. Furthermore, since the entire apparatus has no moving parts, it can be a simple structure, and it can be said that it is extremely excellent in terms of economics such as cost.

[Description of All Drawings of Second Embodiment: FIGS. 12 to 16]
Next, a second embodiment of the optical directivity characteristic measuring apparatus of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in measurement steps. In the following description, the same elements are denoted by the same reference numerals and redundant description is omitted.

  In the second embodiment, the light emission characteristics of the reference light source 11 with uniform directivity are measured prior to the measurement of the light emitting device 3 that is the measurement target, and then the light emission characteristics of the light emission device 3 that is the measurement target are measured. And a step of correcting the light emission characteristic of the light emitting device 3 with the light emission characteristic of the reference light source 11.

[Description of Configuration of Second Embodiment: FIGS. 12 and 13]
First, the configuration of the optical directivity measuring apparatus 200 according to the present invention will be described with reference to FIGS. In addition, the same element as 1st Embodiment attaches | subjects the same number, and the overlapping description is abbreviate | omitted.

FIG. 12 is a cross-sectional view of the optical directivity measuring apparatus 200 of the present invention.
In FIG. 12, the reference light source 11 is a reference light source having uniform directivity, and is set on the mounting table 6 a of the measurement stage 6 at the same position as the position where the light emitting device 3 is set.
FIG. 12 schematically shows how the light emitting device 3 is set on the mounting table 6 of the measurement stage 6 instead of the reference light source 11 in the subsequent measurement step.

FIG. 13 is a block diagram of the data processing means 100 of the optical directivity measuring apparatus 200 of the present invention.
In FIG. 13, the reference light source data storage unit 71a stores the light emission characteristics of the reference light source calculated by the light receiving device 5n, the light distribution data calculation unit 6n, and the light emission characteristic calculation unit 70 as reference light source data D3k.
FIG. 13 schematically shows a state in which the light emitting device 3 is connected to the power control unit 74 of the data processing means 10 instead of the reference light source 11 in the subsequent measurement step.

  The optical directivity characteristic calculation unit 72 corrects the light emission characteristic data D3 of the light emitting device 3 with the reference light source data D3k stored in the reference light source data storage unit 74, and calculates the optical directivity characteristic data D4.

[Description of Operation of Second Embodiment: FIGS. 12 to 16]
Next, the operation of the optical directivity measuring apparatus of the present invention will be described with reference to FIG.
FIG. 14 is a flowchart of the optical directivity measuring apparatus of the present invention. The flow of measurement will be described in detail in comparison with the operation of the components of the data processing means 10 shown in FIG.

[Reference light source emission step]
As shown in FIG. 12, the reference light source 11 is set on the mounting table 6 a of the measurement stage 6, and the drive power supply V is supplied from the data processing means 10 to cause the reference light source 11 to emit light. (ST1)

[Reference light source data calculation step]
As shown in FIG. 13, the light distribution data calculation unit 6n calculates light distribution data Dn based on the light reception signal output Sn of the light receiving device 5n, and the light emission characteristic calculation unit 70 calculates the light emission characteristics of the reference light source 11 based on the light distribution data Dn. Is calculated as reference light source data D3k. (ST2)

[Reference light source data storage step]
As shown in FIG. 13, the reference light source data storage unit 71a stores the light emission characteristics of the reference light source 11 calculated by the light emission characteristic calculation unit 70 as reference light source data D3k. (ST3)

[Light emitting device light emission step]
As shown in FIG. 12, the light emitting device 3 is set on the mounting table 6 a of the measurement stage 6 instead of the reference light source 11, and the driving power supply V is supplied from the data processing means 10 to cause the light emitting device 3 to emit light. (ST10)

[Light emission characteristic data calculation step]
As shown in FIG. 13, the light distribution data calculation unit 6n calculates light distribution data Dn based on the light reception signal output Sn of the light receiving device 5n, and the light emission characteristic calculation unit 70 emits light emission characteristics of the light emitting device 3 based on the light distribution data Dn. Is calculated as light emission characteristic data D3. (ST20)

[Light emission characteristic data storage step]
As shown in FIG. 13, the light emission characteristic data storage unit 71 stores the light emission characteristic data D <b> 3 calculated by the light emission characteristic calculation unit 70. (ST30)

[Optical directivity calculation step]
As shown in FIG. 13, the optical directivity characteristic calculation unit 72 corrects the light emission characteristic data D3 stored in the light emission characteristic data storage unit 71 with the reference light source data D3k stored in the reference light source data storage unit 71a, and the optical directivity. Calculated as characteristic data D4. (ST40)

[Detailed description of the effects of the invention]
As described above, the great difference between the second embodiment and the first embodiment of the present invention is that the light emission characteristic data D3 of the light emitting device 3 as the measurement target is corrected to the final optical directivity characteristic data D4. It can be said that it is in the correction contents for.

  That is, in the first embodiment, the correction content is based on correction data D3b based on past experimental data and knowledge, but in the second embodiment, the correction content is reference light source data D3k obtained by actually measuring the reference light source. Therefore, it is possible to theoretically reduce error factors such as changes in ambient conditions and changes in the mechanical shape of the apparatus to the level of stability of the reference light source 11, and the entire optical directivity characteristic measuring apparatus 200 can be reduced. The accuracy can be further increased.

[Description of All Drawings of Third Embodiment: FIG. 17]
Next, a third embodiment of the optical directivity measuring apparatus of the present invention will be described with reference to FIG. The third embodiment differs from the second embodiment in the number and arrangement of the light receiving devices 5n. In the following description, the same elements are denoted by the same reference numerals and redundant description is omitted.

The configuration of the optical directivity measuring apparatus 300 (not shown) of the present invention will be described with reference to FIG.
FIG. 17 is a schematic plan view of the optical directivity measuring apparatus 300 according to the present invention. In the periphery of the light emitting device 3, there are three light receiving devices 5n (“51”, “52”, “53” in FIG. 17). Are equally arranged around the light emitting device 3 so as to form an equal angle of 120 degrees.
The light receiving surfaces 5na of the three light receiving devices 5n are inclined with respect to the light emitting surface 3a of the light emitting device 3 by a predetermined angle θ.

[Detailed description of the effects of the invention]
The effect of the optical directivity characteristic measuring apparatus 300 according to the present invention is that the three light receiving devices 5n are provided around the light emitting device 3, whereby the measurement of the light distribution data Dn is further elaborated, and the final optical directivity characteristic data D4 is obtained. That is, it is possible to achieve higher accuracy.

[Description of All Drawings of Fourth Embodiment: FIG. 18]
Next, a fourth embodiment of the optical directivity measuring apparatus of the present invention will be described with reference to FIG. The fourth embodiment is different from the second embodiment in the number and arrangement of the light receiving devices 5n. In the following description, the same elements are denoted by the same reference numerals and redundant description is omitted.

The configuration of the optical directivity measuring apparatus 400 (not shown) of the present invention will be described with reference to FIG.
FIG. 18 is a schematic plan view of the optical directivity characteristic measuring apparatus 400 of the present invention. Around the light emitting device 3, there are four light receiving devices 5n (“51”, “52”, “53” in FIG. 18). , “54”) are equally arranged around the light emitting device 3 so as to form an equal angle of 90 degrees.
The light receiving surfaces 5na of the four light receiving devices 5n are inclined with respect to the light emitting surface 3a of the light emitting device 3 by a predetermined angle θ.

[Detailed description of the effects of the invention]
The effect of the optical directivity characteristic measuring apparatus according to the present invention is that the four light receiving devices 5n are provided around the light emitting device 3, so that the measurement of the light distribution data becomes more precise and the final optical directivity characteristic data is highly accurate. Can be achieved. Of course, a larger number of light receiving devices can be used for the number and arrangement of the light receiving devices.

[Description of All Drawings of Fifth Embodiment: FIGS. 19 and 20]
Next, a fifth embodiment of the optical directivity characteristic measuring apparatus of the present invention will be described with reference to FIGS. 19 and 20. The fifth embodiment is different from the second embodiment in the posture and configuration of the light receiving device. In the following description, the same elements are denoted by the same reference numerals and redundant description is omitted.

First, the configuration of the optical directivity characteristic measuring apparatus 500 of the present invention will be described with reference to FIG. FIG. 19 is a cross-sectional view of the optical directivity measuring apparatus 500 of the present invention.
In FIG. 19, the light receiving device 5 n is measured so that the optical axes K 1 and K 2 of the light receiving device 5 n are parallel to the optical axis L of the light emitting device 3 in the vicinity of the light emitting device 3 and substantially on the same plane as the light emitting device 3. It is installed on the stage 6. Each light receiving surface 5na of the two light receiving devices 5n is provided with a fish-eye lens 4n having a wide angle of 180 degrees.

Next, the operation of the optical directivity measuring apparatus 500 of the present invention will be described with reference to FIG.
FIG. 20 is a ray diagram of the optical directivity measuring apparatus 500 of the present invention. In FIG. 20, light in each direction from the light emitting device 3 is reflected by the screen reflecting surface 20a of the screen 20, converged by the fisheye lens 4n, and enters the light receiving device 5n. Since the fish-eye lens 4n is a 180-degree wide-angle fish-eye lens, it can capture light in a wide range of directions.

[Detailed description of the effects of the invention]
The effect of the optical directivity characteristic measuring apparatus 500 of the present invention is that the light receiving device 5n can be disposed in the vicinity of the light emitting device 3 and substantially on the same plane as the light emitting device 3 without restriction on the installation angle. Can be received, so that it is possible to reduce the size of the screen 20 and further reduce the size of the optical directivity measuring device 500 while maintaining high-precision measurement of the optical directivity data D4 of the light emitting device 3. It becomes.

[Overall summary]
As described above, according to the optical directivity characteristic measuring apparatus of the present invention, since the optical directivity characteristic data D4 of the light emitting device 3 is measured in a short time, there is no decrease in accuracy due to a temperature rise. Since there are no movable parts, it is possible to provide a low-cost and high-precision optical directivity characteristic measuring apparatus that does not require maintenance. It should be noted that the embodiment described above is not limited to this, and can be arbitrarily changed as long as it satisfies the gist of the present invention.

The present invention is capable of measuring optical directivity characteristics for many types of light-emitting devices, such as light sources based on conventional methods and new principles. In addition to the optical directional characteristics, it can be applied to various measurements such as illuminance, total luminous flux, and saturation as well as general luminous intensity.
In addition, since the behavior of radio waves with short wavelengths is the same as that of light, it is considered useful for characteristic analysis and measurement of ultra-high frequency antennas.

DESCRIPTION OF SYMBOLS 1,200,300,400,500 Optical directivity measuring device 2 Screen 20 Screen 2a Screen reflective surface 20a Screen reflective surface 20b Screen support part 3 Light-emitting device 3a Light-emitting device light-emitting surface 4n Fisheye lens 5n Light-receiving device 51-54 Light-receiving device 5na Light-receiving Surface 6 Measurement stage 6a Mounting table 8 Power supply terminal 8a Spring electrode 9 Supporting table 10, 100 Data processing means 10a Power supply cable 10b Signal cable 11 Reference light source 13 Optical fiber 14 Spectrometer 15 XY slide part 15a XY slide direction 16 Motor for tilting 16a Tilt motor rotation direction 17 Movable base 18 Rotation motor 18a Rotation motor rotation direction 19 Light receiver L Optical axis of light emitting device 3 K1, K2 Optical axis of light receiving device 5n 6n Light distribution data calculation unit 70 Light emission characteristic calculation unit 71 Light emission characteristic data storage unit 71a Reference light source data storage unit 71b Correction data storage unit 72 Optical directivity characteristic calculation unit 73 Optical directivity characteristic display unit 74 Power supply control unit Sn Light reception signal output Dn Light distribution data d1x (left) Light distribution data d1y (left) ) Light distribution data on measurement surface orthogonal to light distribution data d2x (Right) Light distribution data d2y (Right) Light distribution data on measurement surface orthogonal to light distribution data D3 Emission characteristic data d3x Emission characteristic data d3y Emission characteristic data d3x Whole emission characteristic data of orthogonal measurement surface D3k Reference light source data D3b Correction data D4 Optical directivity characteristic data dx Optical directivity characteristic along a certain plane dy Optical directivity characteristic along a plane perpendicular to the certain plane V Light emitting device drive signal P point Center position of light emitting device 3 Point O Center of screen 2

Claims (5)

A light-emitting device 3 which is an object to be measured, a reflecting means 2 for reflecting light from the light-emitting device 3, a light-receiving device 5n for detecting light from the light-emitting device 3 reflected from the reflecting means 2, and the light-receiving device In the light emission characteristic measuring apparatus 1 having the data processing means 10 for calculating the light emission characteristic of the light emitting device 3 based on the light reception signal output Sn of the apparatus 5n, the reflecting means 2 is a screen having a curved or concave reflecting surface 2a. 2, the light emitting device 3 is disposed at a substantially central position on the reflective surface 2 a side of the screen 2, and a plurality of the light receiving devices 5 n are disposed in the vicinity of the light emitting device 3, and the data processing means 10 And a light emission characteristic calculating unit 70 for calculating light emission characteristic data D3 which is a light emission characteristic of the light emitting device 3 based on light reception signal outputs Sn of the plurality of light receiving devices 5n. Directivity characteristic measuring apparatus.
  The optical directivity characteristic measuring apparatus according to claim 1, wherein the plurality of light receiving devices (5n) are arranged at equal intervals around the light emitting device (3).   3. The optical directivity characteristic measuring apparatus according to claim 2, wherein each of the light receiving surfaces 5 na of the plurality of light receiving devices 5 n is inclined by a predetermined angle θ with respect to the light emitting surface 3 a of the light emitting device 3.   The optical directivity characteristic measuring apparatus according to claim 1 or 2, wherein a fish-eye lens 4n is provided on each light receiving surface 5na of the plurality of light receiving devices 5n. 5. The optical directivity characteristic measuring apparatus according to claim 1, wherein the light receiving device 5n is an image sensor device.

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