JPS61130829A - Light receiving section for illuminometer - Google Patents
Light receiving section for illuminometerInfo
- Publication number
- JPS61130829A JPS61130829A JP25310884A JP25310884A JPS61130829A JP S61130829 A JPS61130829 A JP S61130829A JP 25310884 A JP25310884 A JP 25310884A JP 25310884 A JP25310884 A JP 25310884A JP S61130829 A JPS61130829 A JP S61130829A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light receiving
- light diffusing
- plate
- diffusing plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000005286 illumination Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 2
- 230000000007 visual effect Effects 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0418—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using attenuators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0474—Diffusers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0488—Optical or mechanical part supplementary adjustable parts with spectral filtering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、受光角特性補正済みの受光部をもつ照度計受
光部に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an illuminometer light receiving section having a light receiving section whose light receiving angle characteristics have been corrected.
従来の技術
照度計がもつべき重要な特性は２つあり、１つは受光部
の分光感度特性が標準比視感度に合致していることと、
もう１つは、受光部の受光角特性が余弦則に合致してい
ることである。このうち後者の余弦則は第３図のように
表せる。第３図ａにおいて受光面の中心に立てた垂線と
入射光とのなす角を受光角θとすると、受光角の変化に
ともなう受光部の感度がωＳθで変化することを余弦則
に従うという。この特性を第３図すに示す。There are two important characteristics that conventional technology illuminance meters should have: one is that the spectral sensitivity characteristics of the light receiving part match the standard luminous efficiency;
The other is that the light receiving angle characteristics of the light receiving portion match the cosine law. The latter cosine law can be expressed as shown in Figure 3. If the angle between the perpendicular to the center of the light-receiving surface and the incident light is the light-receiving angle θ in FIG. This characteristic is shown in Figure 3.
照度計の受光部は通常、光電変換素子の上に光拡散板を
おくことにより上記受光角特性を余弦則に合致させるよ
うにしている。この光拡散板はその形状が平面である場
合、第４図のように拡散性のよいものほど余弦則に近似
する。しかし、最も優れた拡散性を持つ光拡散板を用い
た場合でも、受光面の形状が平面であり、また周辺の基
板と同一平面またはそれより低い位置にある場合には、
受光角が９０°に近づくにつれ、受光角特性の余弦則か
らのはずれが大きくなる。そこでこれを改善するため、
光拡散板およびその周辺の基板の形状に様々な工夫がこ
らされている。例えば、第６図に示すように光拡散板の
形状を平面から立体状にするとともに、周辺の基板より
も拡散板を持ち上げることＫよって９００付近での受光
角特性の改善をはかっている（例えば実新公開Ｓ６〇−
０１０７８７号公報）。The light receiving section of the illuminance meter usually has a light diffusing plate placed on top of the photoelectric conversion element so that the above-mentioned light receiving angle characteristics match the cosine law. When this light diffusing plate has a planar shape, the better the diffusivity of the plate as shown in FIG. 4, the more it approximates the cosine law. However, even when using a light diffusing plate with the best diffusing properties, if the light-receiving surface is flat and located on the same plane as or lower than the surrounding substrate,
As the acceptance angle approaches 90°, the deviation of the acceptance angle characteristic from the cosine law increases. So to improve this,
Various improvements have been made to the shape of the light diffusing plate and the surrounding substrates. For example, as shown in Fig. 6, the shape of the light diffusion plate is changed from a plane to a three-dimensional shape, and the light reception angle characteristics around 900K are improved by raising the diffusion plate above the surrounding substrates (for example, Real new release S6〇-
010787).
発明が解決しようとする問題点
このよう、な従来の照度計受光部では、光拡散板を基板
より持ち上げることにより、９０°付近での指示値が零
にならない場合もある。また、光拡散板が立体状である
場合、測定基準面を光拡散板のどの位置にするかによっ
て光源からの距離が変わるため、その照度値の信頼性に
問題が生じてくる。また測定時および収納時に光拡散板
の表面に傷がつきやすく、受光角特性に悪影響をおよぼ
すといった問題点が生じてくる。本発明は上記問題点を
解決するもので、受光角特性を余弦則に精度よく合致さ
せることを目的とする。Problems to be Solved by the Invention In such a conventional illuminance meter light receiving section, the indicated value may not become zero at around 90° by lifting the light diffusing plate above the substrate. Furthermore, when the light diffusing plate is three-dimensional, the distance from the light source changes depending on where the measurement reference plane is located on the light diffusing plate, which poses a problem in the reliability of the illuminance value. Further, the surface of the light diffusing plate is likely to be scratched during measurement and storage, which poses a problem in that the light receiving angle characteristics are adversely affected. The present invention is intended to solve the above-mentioned problems, and it is an object of the present invention to make the light receiving angle characteristics match the cosine law with high precision.
問題点を解決するための手段 。A means to solve problems.
本発明の照度計受光部は、上記目的を達成するため、受
光部の光拡散板の入射面に複数の半球状の光拡散素子を
配置する構成としている。In order to achieve the above object, the illumination meter light receiving section of the present invention has a configuration in which a plurality of hemispherical light diffusing elements are arranged on the incident surface of the light diffusing plate of the light receiving section.
作 用
本発明の照度計受光部は光拡散板を上記の構成とするこ
とにより、光拡散板の表面で反射され光電変換素子に入
射しなかった光が半球状の光拡散素子を通して光拡散板
に吸収される。Function: In the illumination meter light receiving section of the present invention, the light diffusing plate has the above-described configuration, so that the light reflected on the surface of the light diffusing plate and not entering the photoelectric conversion element passes through the hemispherical light diffusing element and passes through the light diffusing plate. be absorbed into.
この結果、受光角の大きな方向からの入射光が増加し、
受光角９０’付近での受光角特性の余弦則からのはずれ
を補正することになる。As a result, incident light from the direction with a large acceptance angle increases,
The deviation of the light receiving angle characteristic from the cosine law near the light receiving angle 90' is corrected.
実施例
第１図は本発明の実施例における照度計受光部の基板、
４は減光板、６は視感度補正フィルタ、６は光電変換素
子である。光拡散板１は、第１図に示すように入射面に
半球状の光拡散素子を配置しており、光拡散板に入射し
た光は順次減光板３゜視感度補正フィルタ４を通って光
電変換素子６に達して光電変換される。Embodiment FIG. 1 shows the substrate of the illumination meter light receiving part in the embodiment of the present invention.
4 is a light reduction plate, 6 is a visibility correction filter, and 6 is a photoelectric conversion element. As shown in FIG. 1, the light diffusing plate 1 has hemispherical light diffusing elements arranged on the incident surface, and the light incident on the light diffusing plate sequentially passes through the attenuating plate 3 and the visibility correction filter 4 to be photoelectrically transmitted. The light reaches the conversion element 6 and undergoes photoelectric conversion.
第２図は、光拡散板１に入射した光の流れを示すもので
、受光角の小さな方向からの光Ｘは、半球状の光拡散素
子を配置しない時と同様に光拡散 ）板１を通
過して受光部内に導かれる。また、受光角の大きな方向
からの光ｙは、光拡散板１の入射面が平板の時には表面
反射で逃げていた光も半球状の光拡散素子２でき吸収さ
れ、同様に光電変換される。光拡散板１をこのような構
造とすることにより、受光角の大きな方向からの光が入
射した時に発生する表面反射をなくすことができ、受光
角９０°付近での受光角特性の余弦則からのはずれを補
正することができる。Figure 2 shows the flow of light incident on the light diffusing plate 1. Light X from a direction with a small acceptance angle is diffused through the light diffusing plate 1 in the same way as when no hemispherical light diffusing element is arranged. It passes through and is guided into the light receiving section. Furthermore, light y from a direction with a large acceptance angle, which would have escaped due to surface reflection when the incident surface of the light diffusing plate 1 was a flat plate, is absorbed by the hemispherical light diffusing element 2 and similarly photoelectrically converted. By configuring the light diffusing plate 1 in this way, it is possible to eliminate the surface reflection that occurs when light enters from a direction with a large acceptance angle. The deviation can be corrected.
発明の効果
本発明による照度計受光部は、受光部の光拡散板の入射
面に複数の半球状の光拡散素子を配量しているため、測
定基準面の位置の設定誤差を小さくでき、照度値の信頼
性を向上させるとともに、余弦則に精度よく合致した受
光角特性をもち、照度計用受光部としてその効果は大き
い。Effects of the Invention The light receiving section of the illumination meter according to the present invention has a plurality of hemispherical light diffusing elements arranged on the incident surface of the light diffusing plate of the light receiving section, so it is possible to reduce the setting error in the position of the measurement reference plane. In addition to improving the reliability of illuminance values, it has light receiving angle characteristics that precisely match the cosine law, making it highly effective as a light receiving section for illuminance meters.
第１図は本発明の実施例における照度計受光部の断面図
、第２図は同党拡散板の入射光の方向を示す図、第３図
は余弦則に従う受光角特性の説明図、第４図は拡散性の
違いによる照度計受光部の受光角特性図、第６図は従来
の照度計受光部の断面図である。
１・・・・・・光拡散板、２・・・・・・半球状の光拡
散素子、３・・・・・・受光部の基板、４・・・・・・
減光板、５・・・・・・視感度補正フィルタ、６・・・
・・・光電変換素子。
第２図
第３図
受尤角７１ｊ ＜ｅ）
第４図
骨芝ｊｌ濱（の
第５図
（ｆｔ＄倉仮FIG. 1 is a cross-sectional view of the illuminometer light receiving part in an embodiment of the present invention, FIG. 2 is a diagram showing the direction of incident light on the diffuser plate, FIG. 3 is an explanatory diagram of the acceptance angle characteristics according to the cosine law, and FIG. FIG. 4 is a light-receiving angle characteristic diagram of the light-receiving section of an illuminance meter due to differences in diffusivity, and FIG. 6 is a sectional view of a conventional light-receiving section of an illuminance meter. 1...Light diffusion plate, 2...Semispherical light diffusion element, 3...Substrate of light receiving section, 4...
Light reduction plate, 5... Visibility correction filter, 6...
...Photoelectric conversion element. Figure 2 Figure 3 Acceptable angle 71j <e) Figure 4
Claims (1)
てなる照度計受光部。An illuminance meter light receiving section consisting of a plurality of hemispherical light diffusing elements arranged on the incident surface of a light diffusing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25310884A JPS61130829A (en) | 1984-11-30 | 1984-11-30 | Light receiving section for illuminometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25310884A JPS61130829A (en) | 1984-11-30 | 1984-11-30 | Light receiving section for illuminometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61130829A true JPS61130829A (en) | 1986-06-18 |
Family
ID=17246605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25310884A Pending JPS61130829A (en) | 1984-11-30 | 1984-11-30 | Light receiving section for illuminometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61130829A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579984A (en) * | 2018-12-27 | 2019-04-05 | 西北核技术研究所 | A kind of laser beam homogenizes attenuator |
-
1984
- 1984-11-30 JP JP25310884A patent/JPS61130829A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579984A (en) * | 2018-12-27 | 2019-04-05 | 西北核技术研究所 | A kind of laser beam homogenizes attenuator |
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