JPH06331431A - Light source for illuminometer calibration - Google Patents
Light source for illuminometer calibrationInfo
- Publication number
- JPH06331431A JPH06331431A JP12222093A JP12222093A JPH06331431A JP H06331431 A JPH06331431 A JP H06331431A JP 12222093 A JP12222093 A JP 12222093A JP 12222093 A JP12222093 A JP 12222093A JP H06331431 A JPH06331431 A JP H06331431A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- calibration
- illuminance
- filament
- luminous intensity
- 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.)
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、照度計を校正するため
の照度計校正用光源に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a illuminance meter calibration light source for calibrating an illuminance meter.
【０００２】[0002]
【従来の技術】照度計の目盛りの校正は、測光ベンチ上
に光度標準電球と校正しようとする照度計をセットし
て、前記光度標準電球の光度Ｉと、前記光度標準電球と
照度計受光面の距離ｄから、照度計受光面での照度Ｅを
（１）式により求め、この値で照度計の指示値を調整す
るものである。2. Description of the Related Art To calibrate the scale of an illuminance meter, a luminosity standard light bulb and an illuminance meter to be calibrated are set on a photometric bench, and the luminosity I of the luminosity standard light bulb, the luminosity standard light bulb and the illuminance meter light receiving surface are set. The illuminance E on the light-receiving surface of the illuminometer is obtained from the distance d of ## EQU1 ## and the indicated value of the illuminometer is adjusted by this value.
【０００３】Ｅ＝Ｉ／ｄ2 …（１） 実際には、照度計の感度の切り換えがあるため、数十ル
ックスから数万ルックスの広い範囲で指示値の校正が必
要であり、このため、ベンチ上で距離ｄを変え、さらに
光度の異なる光度標準電球を複数切り換えて行わなけれ
ばならない。すなわち、精密な校正に使用される測光ベ
ンチでは、光軸のアライメントや空間的な制約からせい
ぜい４ｍが限度であり、このベンチ上で光度標準電球と
照度計の距離を設定できるのは、せいぜい５０ｃｍから
３ｍ程度である。このため距離ｄだけでは１：４０の照
度比を校正するのが限度である。したがって光度の異な
る３〜４種の光度標準電球を切り換える必要がある。E = I / d 2 (1) Actually, because the sensitivity of the illuminometer is switched, it is necessary to calibrate the indicated value in a wide range of tens to tens of thousands of lux. It is necessary to change the distance d on the bench and switch a plurality of standard luminous intensity bulbs having different luminous intensities. That is, the photometric bench used for precise calibration has a limit of at most 4 m due to the alignment of the optical axis and spatial restrictions, and the distance between the standard light bulb and the illuminance meter can be set on this bench at most 50 cm. To about 3 m. Therefore, the illuminance ratio of 1:40 can be calibrated only with the distance d. Therefore, it is necessary to switch 3 to 4 types of light intensity standard light bulbs having different light intensities.
【０００４】[0004]
【発明が解決しようとする課題】上記のように、光度標
準電球を切り換える場合、そのつど電球の位置合わせを
行わなければならず、きわめて煩雑であつた。また、数
十万ルックスの照度レベルの校正では、２ｋｗ〜３ｋｗ
の光度標準電球を必要とし、高ワットの標準電球を運用
するために、電力の安定供給など安定で精度のある照度
設定に大きな課題があった。As described above, when switching the light intensity standard light bulb, the light bulb must be aligned each time, which is very complicated. In addition, in the calibration of the illuminance level of several hundred thousand lux, 2 kw to 3 kw
In order to operate the high wattage standard light bulb, there was a big problem in stable and accurate illuminance setting such as stable power supply.
【０００５】本発明は上記問題を解決するもので、照度
計の目盛りの校正を行うための光度標準光源において、
同一投入電力で得られる光度を倍増し、高い照度レベル
の校正を実現することができる照度計校正用光源を提供
することを目的とする。The present invention solves the above problems and provides a luminous intensity standard light source for calibrating the scale of an illuminometer.
An object of the present invention is to provide a illuminance meter calibration light source capable of calibrating a high illuminance level by doubling the luminous intensity obtained with the same input power.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明の照度計校正用光源は、照度校正光軸上に
おいて、光度標準光源の発光部またはフィラメントから
校正しようとする照度計側と反対側に発せられる光束
を、その曲率中心が光度標準光源の発光部またはフィラ
メントの近傍にあり、かつ照度校正光軸上に配置した凹
面鏡によって反射させ、光度標準光源の発光部またはフ
ィラメントの近傍で、かつ照度校正用光軸に垂直な平面
上に前記発光部またはフィラメントの像を結像させ、光
度標準光源の発光部またはフィラメントの光度と、凹面
鏡で結像された光度標準光源の発光部またはフィラメン
トの光度の合成された光度を使用するようにしたもので
ある。In order to solve the above-mentioned problems, the illuminance meter calibration light source of the present invention is an illuminance meter which is to be calibrated from the light emitting part or filament of the luminous intensity standard light source on the illuminance calibration optical axis. The luminous flux emitted to the opposite side is reflected by a concave mirror whose center of curvature is in the vicinity of the light emitting part or filament of the light intensity standard light source and on the illuminance calibration optical axis, The image of the light emitting part or filament is formed in the vicinity and on the plane perpendicular to the optical axis for illuminance calibration, and the light intensity of the light emitting part or filament of the light intensity standard light source and the light emission of the light intensity standard light source imaged by the concave mirror It is intended to use the combined luminous intensity of the parts or filaments.
【０００７】さらに、凹面鏡と光度標準光源の発光部ま
たはフィラメントとの間に設けた光シャッタで、光度標
準光源の発光部またはフィラメントの像を消したり出し
たりするようにしたものである。Further, an optical shutter provided between the concave mirror and the light emitting portion or filament of the standard light source for luminosity erases or projects the image of the light emitting portion or filament of the standard light source for luminosity.
【０００８】[0008]
【作用】上記構成によって、凹面鏡を用いて光度標準光
源の発光部またはフィラメントの近傍に、この発光部ま
たはフィラメントの像を結像させることで、光度標準電
球単独で使用する場合の倍の光度の光源を実現でき、照
度計の校正できる目盛りのレベルの増大を実現できる。
また、凹面鏡と光度標準光源の発光部との間に設けた光
シャッタを用いて、前記光度標準光源の発光部の像を消
したり出したりすることで、光源を差し替えることなく
一つの光度標準光源により、２つの光度レベルの光度標
準の設定を実現でき、従来より広い照度レベルの設定が
可能となる。With the above construction, by forming an image of this luminous part or filament in the vicinity of the luminous part or filament of the luminous intensity standard light source using a concave mirror, the luminous intensity of double that of the case of using the luminous intensity standard bulb alone is achieved. The light source can be realized, and the level of the calibrated scale of the luminometer can be increased.
In addition, by using an optical shutter provided between the concave mirror and the light emitting unit of the light intensity standard light source, the image of the light emitting unit of the light intensity standard light source is erased and displayed, so that one light intensity standard light source is not replaced. Thus, it is possible to realize the standard setting of two luminous intensity levels, and it is possible to set a wider illuminance level than ever before.
【０００９】[0009]
【実施例】以下本発明の一実施例を図面に基づいて説明
する。本発明の第１の実施例として、一本のフィラメン
トより成る光度標準電球を用いた照度計校正用光源につ
いて図面を使って説明する。図１は本発明の第１の実施
例の照度計校正用光源の構成図を示す。光度標準電球１
のフィラメント２からの光束を、照度校正用光軸３上の
フィラメント２からの距離がほぼ曲率半径に等しい位置
に配置した凹面鏡４によって反射させ、フィラメント２
の近傍でかつフィラメント２を含む照度校正用光軸３に
垂直な平面上にフィラメント像５を結像する。このフィ
ラメント像５とフィラメント２の両者の光度を合成した
光度を使用して、凹面鏡４とは反対側の照度校正用光軸
３上に設置した照度計６の照度指示値を校正する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As a first embodiment of the present invention, an illuminance meter calibration light source using a luminous intensity standard bulb made of one filament will be described with reference to the drawings. FIG. 1 shows a block diagram of a illuminance meter calibration light source according to a first embodiment of the present invention. Luminous intensity standard bulb 1
The luminous flux from the filament 2 is reflected by the concave mirror 4 arranged on the illuminance calibration optical axis 3 at a position where the distance from the filament 2 is substantially equal to the radius of curvature.
The filament image 5 is formed on a plane near the optical axis 3 for illuminance calibration including the filament 2. The illuminance indicated value of the illuminance meter 6 installed on the illuminance calibration optical axis 3 on the opposite side of the concave mirror 4 is calibrated using the luminosity obtained by combining the luminosity of both the filament image 5 and the filament 2.
【００１０】フィラメント２は通常長さ数十ｍｍ、直径
数ｍｍの円筒状であるため、フィラメント２とフィラメ
ント像５を平行に近接させても、５０ｃｍ以上離れた照
度計６の受光面７の照度は、フィラメント２とフィラメ
ント像５の中心と前記照度計受光面７との距離に対して
逆二乗則は十分成り立つ。Since the filament 2 is usually a cylindrical shape having a length of several tens of mm and a diameter of several mm, even if the filament 2 and the filament image 5 are brought close to each other in parallel, the illuminance of the light receiving surface 7 of the illuminance meter 6 at a distance of 50 cm or more. The inverse square law is sufficiently established for the distance between the filament 2 and the center of the filament image 5 and the illuminance meter light-receiving surface 7.
【００１１】次に本発明の第２の実施例として、複数の
フィラメント２より成る光度標準電球１を用いた照度計
校正用光源について図面を使って説明する。図２は、本
発明の第２の実施例の照度計校正用光源の構成図を示
す。第２の実施例は、第１の実施例と同様の構成で、凹
面鏡４を用いて、平行に配置されたフィラメント２の間
にフィラメント像５を結像させるようにしたものであ
る。これにより、通常の標準電球のフィラメント発光面
積をそれほど大きくすることなく、光度を増加できる。
光度基準器として使用される近藤シルバニア製５００Ｗ
光度標準電球では、距離５０ｃｍで３０００［ｌｘ］、
同じく７５０Ｗでも距離５０ｃｍで１００００［ｌｘ］
程度である。したがって本発明の実施例により、７５０
Ｗ光度標準電球で距離５０ｃｍにおいて２００００［ｌ
ｘ］程度の照度レベルの校正が可能である。Next, as a second embodiment of the present invention, an illuminance meter calibration light source using a luminous intensity standard bulb 1 composed of a plurality of filaments 2 will be described with reference to the drawings. FIG. 2 is a configuration diagram of a illuminance meter calibration light source according to a second embodiment of the present invention. The second embodiment has a configuration similar to that of the first embodiment and uses a concave mirror 4 to form a filament image 5 between filaments 2 arranged in parallel. As a result, the luminous intensity can be increased without increasing the filament light emitting area of a normal standard light bulb so much.
Kondo Sylvanian 500W used as luminous intensity standard
With the standard luminous intensity bulb, 3000 [lx] at a distance of 50 cm,
Similarly, at 750 W, the distance is 50 cm and 10000 [lx].
It is a degree. Therefore, according to an embodiment of the present invention,
20000 [l at a distance of 50 cm with a W light intensity standard bulb
It is possible to calibrate the illuminance level of about [x].
【００１２】次に本発明の第３の実施例を図面を使って
説明する。図３は、本発明の第３の実施例の照度計校正
用光源の構成図を示す。第３の実施例は第１の実施例の
構成において、光度標準電球１光源と凹面鏡４との間に
照度校正用光軸３に対して８０゜以下の角度で光シャッ
タ８を配置し、低照度校正には、この光シャッタ８を閉
じて光度標準電球１のフィラメント２からのみの光度を
使用し、高い照度校正には、光シャッタ８を開いて光度
標準電球１のフィラメント２および凹面鏡４により結像
されたフィラメント像５からの光度を使用する。Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a configuration diagram of a illuminance meter calibration light source according to a third embodiment of the present invention. In the third embodiment, in the structure of the first embodiment, an optical shutter 8 is arranged between the light source of the standard luminous intensity bulb 1 and the concave mirror 4 at an angle of 80 ° or less with respect to the optical axis 3 for illuminance calibration. For the illuminance calibration, the light shutter 8 is closed and only the luminous intensity from the filament 2 of the luminous intensity standard bulb 1 is used. For the high illuminance calibration, the optical shutter 8 is opened and the filament 2 of the luminous intensity standard bulb 1 and the concave mirror 4 are used. The luminous intensity from the imaged filament image 5 is used.
【００１３】なお、光シャッタ８を照度校正用光軸３に
対して８０゜以下の角度で配置するのは、フィラメント
２からの光が光シャッタ８に反射して、それが、照度校
正の光軸上に混入するのを防ぐためである。さきほどの
５００Ｗ光度標準電球で本実施例を実施した場合、光シ
ャッタ８を閉じてフィラメント２からの光度のみを使用
した場合、距離５０ｃｍから３ｍで設定できる照度はで
１００［ｌｘ］から３０００［ｌｘ］程度である。さら
にシャッタ２を開いてフィラメント２および凹面鏡４に
より結像されたフィラメント像５からの光度を使用する
と、距離５０ｃｍで６０００［ｌｘ］程度まで照度設定
が可能となる。したがって、１回の標準電球の位置合わ
せにより従来より広い照度レベルの設定が実現できる。The optical shutter 8 is arranged at an angle of 80 ° or less with respect to the illuminance calibration optical axis 3 because the light from the filament 2 is reflected by the optical shutter 8 and the illuminance calibration light is reflected. This is to prevent mixing on the shaft. When the present embodiment is carried out with the above-mentioned 500 W light intensity standard light bulb, when the light shutter 8 is closed and only the light intensity from the filament 2 is used, the illuminance that can be set at a distance of 50 cm to 3 m is from 100 [lx] to 3000 [lx. ] It is about. Further, when the shutter 2 is opened and the luminous intensity from the filament image 5 formed by the filament 2 and the concave mirror 4 is used, the illuminance can be set up to about 6000 [lx] at a distance of 50 cm. Therefore, by setting the position of the standard light bulb once, it is possible to set a wider illuminance level than before.
【００１４】[0014]
【発明の効果】以上のように、発明によれば、凹面鏡を
設けたことにより光度標準電球単独で使用する場合の倍
の光度の光源を実現でき、照度計の校正できる目盛りの
レベルの増大を実現できる。また、凹面鏡と光度標準光
源の発光部との間に設けた光シャッタで、前記光度標準
光源の発光部の像を消したり出したりすることにより、
光源を差し替えることなく一つの光度標準光源で、２つ
の光度レベルの光度標準の設定を実現でき、従来より広
い照度レベルの設定が可能となる。As described above, according to the present invention, by providing the concave mirror, it is possible to realize a light source having a light intensity twice as high as that when a standard light bulb is used alone, and increase the level of the calibrated illuminance meter. realizable. Also, with an optical shutter provided between the concave mirror and the light emitting portion of the standard light source for luminosity, by erasing or displaying an image of the light emitting portion of the standard light source for luminosity,
One light intensity standard light source can be used to set two light intensity standards without changing the light source, and a wider illuminance level can be set than before.
【図１】本発明の第１の実施例の照度計校正用光源の構
成図FIG. 1 is a configuration diagram of a illuminance meter calibration light source according to a first embodiment of the present invention.
【図２】本発明の第２の実施例の照度計校正用光源の構
成図FIG. 2 is a configuration diagram of a illuminance meter calibration light source according to a second embodiment of the present invention.
【図３】本発明の第３の実施例の照度計校正用光源の構
成図FIG. 3 is a configuration diagram of a illuminance meter calibration light source according to a third embodiment of the present invention.
１ 光度標準電球 ２ フィラメント ３ 照度校正用光軸 ４ 凹面鏡 ５ フィラメント像 ６ 照度計 ７ 受光面 ８ 光シャッタ 1 Luminous intensity standard light bulb 2 Filament 3 Optical axis for illuminance calibration 4 Concave mirror 5 Filament image 6 Illuminometer 7 Light receiving surface 8 Optical shutter
Claims (3)
光部またはフィラメントが曲率中心近傍にあり、かつ照
度校正用光軸に対して垂直な平面上で前記光度標準光源
の発光部またはフィラメントと、その結像された発光像
が接近して位置するように、照度校正光軸上に配置した
凹面鏡を備えた照度計校正用光源。1. A light intensity standard light source, and a light emitting unit or filament of the light intensity standard light source on a plane where the light emitting unit or filament of the light intensity standard light source is near the center of curvature and is perpendicular to the optical axis for illuminance calibration. An illuminance meter calibration light source having a concave mirror arranged on the illuminance calibration optical axis so that the formed luminescent images are located close to each other.
垂直な平面上で複数の発光部またはフィラメントを持
ち、凹面鏡が前記発光部またはフィラメントの間隙に発
光像を結像するように照度校正用光軸上に配置されてい
る請求項１記載の照度計校正用光源。2. The illuminance standard light source has a plurality of light emitting parts or filaments on a plane perpendicular to an optical axis for illuminance calibration, and the illuminance is such that a concave mirror forms a light emission image in a gap between the light emitting parts or filaments. The illuminance meter calibration light source according to claim 1, which is disposed on the calibration optical axis.
用光軸に対して８０゜以下の角度で配置した光シャッタ
を備え、低照度校正には、前記光シャッタを閉じて前記
光度標準光源の発光部またはフィラメントからのみの光
度を使用し、高い照度校正には、前記光シャッタを開い
て前記光度標準光源の発光部またはフィラメントおよび
前記凹面鏡により結像された発光像からの光度を使用す
るようにした請求項１または２記載の照度計校正用光
源。3. An optical shutter disposed between the light intensity standard light source and the concave mirror at an angle of 80 ° or less with respect to the illuminance calibration optical axis, and for low illuminance calibration, the optical shutter is closed to provide the luminosity standard. Only the luminous intensity from the light emitting part or filament of the light source is used, and for high illuminance calibration, the luminous intensity from the luminous part or filament of the luminous intensity standard light source and the luminous image formed by the concave mirror is used for high illuminance calibration. The illuminance meter calibration light source according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12222093A JP3241165B2 (en) | 1993-05-25 | 1993-05-25 | Light source for illuminometer calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12222093A JP3241165B2 (en) | 1993-05-25 | 1993-05-25 | Light source for illuminometer calibration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06331431A true JPH06331431A (en) | 1994-12-02 |
| JP3241165B2 JP3241165B2 (en) | 2001-12-25 |
Family
ID=14830528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12222093A Expired - Fee Related JP3241165B2 (en) | 1993-05-25 | 1993-05-25 | Light source for illuminometer calibration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3241165B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7286215B2 (en) | 2003-11-21 | 2007-10-23 | Kenji Imura | Light measuring apparatus and a method for correcting non-linearity of a light measuring apparatus |
-
1993
- 1993-05-25 JP JP12222093A patent/JP3241165B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7286215B2 (en) | 2003-11-21 | 2007-10-23 | Kenji Imura | Light measuring apparatus and a method for correcting non-linearity of a light measuring apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3241165B2 (en) | 2001-12-25 |
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| LAPS | Cancellation because of no payment of annual fees |