JPH1172385A - Light receiving device - Google Patents
Light receiving deviceInfo
- Publication number
- JPH1172385A JPH1172385A JP9234118A JP23411897A JPH1172385A JP H1172385 A JPH1172385 A JP H1172385A JP 9234118 A JP9234118 A JP 9234118A JP 23411897 A JP23411897 A JP 23411897A JP H1172385 A JPH1172385 A JP H1172385A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light receiving
- receiving element
- sensitivity
- filter
- 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
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Optical Filters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、被照射面からの反
射光を受光する受光素子を備えた受光装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving device having a light receiving element for receiving light reflected from a surface to be irradiated.
【０００２】[0002]
【従来の技術】受光装置に内設されている受光素子は正
面方向の感度が高く、角度が正面方向からずれるに従っ
て感度が低下するものである。しかし、広い角度の照度
を平均して計測してその照度に基づいて部屋の調光制御
を行うために受光装置を使用する場合、どの方向からの
入射光も同じ感度で検知できることが好ましい。受光素
子の正面方向の感度が高く、周辺方向の感度が低い場合
には、受光素子の正面方向でわずかに明るくなっても照
度が高いと誤って検知され、一方受光素子の正面から所
定角度を有している周辺方向でかなり明るくなっても照
度が低いと誤って検知されることがあるからである。2. Description of the Related Art A light receiving element provided in a light receiving device has a high sensitivity in the front direction, and the sensitivity decreases as the angle shifts from the front direction. However, when the light receiving device is used to average and measure the illuminance at a wide angle and perform dimming control of the room based on the illuminance, it is preferable that incident light from any direction can be detected with the same sensitivity. When the sensitivity in the front direction of the light receiving element is high and the sensitivity in the peripheral direction is low, it is erroneously detected that the illuminance is high even if the light becomes slightly bright in the front direction of the light receiving element. This is because even if the image becomes considerably brighter in the peripheral direction, it may be erroneously detected that the illuminance is low.
【０００３】かかる受光素子の感度特性を補正するもの
として、中心部分の光透過率が最も低く外側に行くに従
って光透過率が同心円状に徐々に高くなっているフィル
タを備えた受光装置がある。該フィルタは、具体的には
透明部材のフィルタ表面に印刷した一定の大きさのドッ
トのドット密度を段階的に径方向に同心円状に変化させ
ることで光透過率を徐々に変化させたものである。As a device for correcting the sensitivity characteristic of such a light receiving element, there is a light receiving device provided with a filter in which the light transmittance at the center is lowest and the light transmittance gradually increases concentrically toward the outside. Specifically, the filter gradually changes the light transmittance by gradually changing the dot density of dots of a certain size printed on the filter surface of the transparent member concentrically in the radial direction. is there.
【０００４】このものにあっては、フィルタが受光素子
の周辺方向からの光を高い光透過率でもって受光素子に
入光させ、受光素子の正面方向からの光を低い透過率で
もって減光して受光素子に入光させる。In this device, a filter allows light from the periphery of the light receiving element to enter the light receiving element with a high light transmittance, and diminishes light from the front direction of the light receiving element with a low light transmittance. To make the light enter the light receiving element.
【０００５】従って、フィルタにより受光素子の感度特
性は広域平均形となされ、受光素子は広い角度の照度を
平均して検知することができる。Therefore, the sensitivity characteristic of the light receiving element is made to be a wide area average type by the filter, and the light receiving element can detect the illuminance at a wide angle by averaging.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上述の
ようなフィルタを有する受光装置にあっては、受光素子
の感度特性を広域平均形とすることができるものの、フ
ィルタを作成するのが困難であった。However, in the light receiving device having the above-described filter, although the sensitivity characteristics of the light receiving element can be of a wide-area average type, it is difficult to create a filter. Was.
【０００７】即ち、フィルタ表面のドットを印刷する部
分のうち、高密度にドットを印刷する部分にあっては、
ドットとドットとの間が極めて狭いので印刷時にドット
同士が連結した形状となって印刷されて印刷むらを生じ
る場合があり、該構成では光透過率が同心円状に変化す
るフィルタを作成するのが困難であった。That is, among the portions of the filter surface where dots are printed, the portions where dots are printed at high density are:
Since the space between the dots is extremely narrow, printing may be performed in a shape in which the dots are connected at the time of printing and printing unevenness may occur.In this configuration, it is necessary to create a filter in which the light transmittance changes concentrically. It was difficult.
【０００８】本発明は、上記問題点を改善するために成
されたもので、その目的とするところは、簡易な構成で
受光素子の受光方向に対する感度特性を広域平均形にな
すことができ、誤検知の確率を低減することのできる受
光装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to make the sensitivity characteristics of a light receiving element in a light receiving direction to a wide area average type with a simple configuration. An object of the present invention is to provide a light receiving device that can reduce the probability of erroneous detection.
【０００９】[0009]
【課題を解決するための手段】本発明は上記の問題を解
決するために、請求項１記載の発明にあっては、被照射
面からの反射光を受光する受光素子を備えた受光装置に
おいて、前記受光素子の感度の低い受光方向の感度を上
げることにより受光素子の受光方向に対する感度特性を
略均一にする感度特性補正手段を設けたことを特徴とす
るものである。According to the present invention, there is provided a light-receiving device having a light-receiving element for receiving light reflected from a surface to be illuminated. In addition, a sensitivity characteristic correcting means for increasing the sensitivity of the light receiving element in the light receiving direction where the sensitivity is low to make the sensitivity characteristic of the light receiving element in the light receiving direction substantially uniform is provided.
【００１０】請求項２記載の発明にあっては、前記感度
特性補正手段は、受光素子の側方を覆い、受光素子の近
傍を通過する光を反射して受光素子に集光する反射板で
あることを特徴とするものである。According to a second aspect of the present invention, the sensitivity characteristic correcting means is a reflecting plate that covers a side of the light receiving element, reflects light passing near the light receiving element, and condenses the light on the light receiving element. It is characterized by having.
【００１１】請求項３記載の発明にあっては、被照射面
からの反射光を受光する受光素子と、該受光素子の感度
の高い受光方向の感度を下げることにより受光素子の受
光方向に対する感度特性を略均一にする感度特性補正手
段と、を備えた受光装置において、前記感度特性補正手
段は、光を透過する透明部材に光を透過しないドット模
様を複数付して、前記受光素子の検知領域に臨む側に配
設したフィルタであって、該フィルタのドット模様はフ
ィルタの中心部分に存在するドット模様を大きくし、フ
ィルタの周縁部分に存在するドット模様をフィルタの中
心部分に存在するドット模様より小さくしたものである
ことを特徴とするものである。According to a third aspect of the present invention, there is provided a light receiving element for receiving light reflected from a surface to be illuminated, and the sensitivity of the light receiving element in the light receiving direction is reduced by lowering the sensitivity of the light receiving element in the high light receiving direction. A sensitivity characteristic correcting unit for making characteristics substantially uniform, wherein the sensitivity characteristic correcting unit attaches a plurality of dot patterns that do not transmit light to a transparent member that transmits light, and detects the light receiving element. A filter arranged on the side facing the area, wherein the dot pattern of the filter is made larger than the dot pattern existing at the center of the filter, and the dot pattern existing at the periphery of the filter is changed to the dot existing at the center of the filter. It is characterized by being smaller than the pattern.
【００１２】請求項４記載の発明にあっては、被照射面
からの反射光を受光する受光素子と、該受光素子の感度
の高い受光方向の感度を下げることにより受光素子の受
光方向に対する感度特性を略均一にする感度特性補正手
段と、を備えた受光装置において、前記感度特性補正手
段は、中心から一定半径内において透過率が低くなされ
た低透過率部と、前記一定半径外において透過率が高く
なされた高透過率部とを有して成り受光素子の検知領域
に臨む側に配設したフィルタであって、前記受光素子の
受光面を前記フィルタ上の各所に投影した場合にフィル
タ上の略全ての位置において前記受光面の投影された領
域は高透過率部と低透過率部とを包含することを特徴と
するものである。According to a fourth aspect of the present invention, there is provided a light receiving element for receiving light reflected from a surface to be illuminated, and the sensitivity of the light receiving element in the light receiving direction is reduced by lowering the sensitivity of the light receiving element in the light receiving direction having high sensitivity. A sensitivity characteristic correction unit for making characteristics substantially uniform, wherein the sensitivity characteristic correction unit includes a low transmittance portion having a low transmittance within a certain radius from the center, and a transmission portion outside the certain radius. A filter having a high transmittance portion with a high transmittance and disposed on the side facing the detection area of the light receiving element, wherein the light receiving surface of the light receiving element is projected to various places on the filter. At substantially all the positions above, the projected area of the light receiving surface includes a high transmittance portion and a low transmittance portion.
【００１３】請求項５記載の発明にあっては、前記受光
装置を建物躯体に取付られる被取付部材に取着して成る
ことを特徴とするものである。According to a fifth aspect of the present invention, the light receiving device is attached to a member to be attached to a building frame.
【００１４】[0014]
【発明の実施の形態】本発明にかかる受光装置の第一実
施の形態を図１〜図４に基づいて、第二実施の形態を図
５乃至図７に基づいて、第三実施の形態を図８に基づい
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a light receiving device according to the present invention will be described with reference to FIGS. 1 to 4, a second embodiment will be described with reference to FIGS. 5 to 7, and a third embodiment will be described. A description will be given based on FIG.
【００１５】〔第一実施の形態〕図１は受光装置の構成
を示す側面図である。図２は最大視野角から受光装置に
入光する光の説明図である。図３は受光装置の検知方向
と受光量との関係の説明図である。図４は受光装置を取
り付けた状態を説明するものであり、図４（ａ）は受光
装置を取り付けた火災報知機の側面図、図４（ｂ）は受
光装置を取り付けた火災報知機の平面図である。[First Embodiment] FIG. 1 is a side view showing the structure of a light receiving device. FIG. 2 is an explanatory diagram of light that enters the light receiving device from the maximum viewing angle. FIG. 3 is an explanatory diagram of the relationship between the detection direction of the light receiving device and the amount of received light. 4A and 4B illustrate a state in which the light receiving device is attached. FIG. 4A is a side view of the fire alarm with the light receiving device attached, and FIG. 4B is a plan view of the fire alarm with the light receiving device attached. FIG.
【００１６】図１において天井面Ｔに取り付けられた受
光装置１は、受光素子２と、感度特性補正手段に相当す
る反射板３を有して構成してある。受光素子２は検知領
域からの光を受光して受光量を検知するものである。反
射板３は受光素子２の側方を覆い、受光素子２の近傍を
通過する光を反射して受光素子に集光するものであり、
受光素子２の感度分布における感度が低い部分の感度を
上げるものである。In FIG. 1, a light receiving device 1 mounted on a ceiling surface T includes a light receiving element 2 and a reflecting plate 3 corresponding to sensitivity characteristic correcting means. The light receiving element 2 detects the amount of received light by receiving light from the detection area. The reflecting plate 3 covers the side of the light receiving element 2 and reflects light passing near the light receiving element 2 to collect the light on the light receiving element.
This is to increase the sensitivity of the low sensitivity portion in the sensitivity distribution of the light receiving element 2.
【００１７】反射板３は具体的には次のように構成して
ある。即ち、反射板３は下面を開放した大略椀状体であ
る。そして、図２に示すように、受光素子２の最大視野
角θ１の方向の検知平面Ａ上の一点Ｐ１からの光が、反
射板３の開口端部３ａに反射して、該反射光が受光素子
２に入光するように、反射板３の湾曲が形成されてい
る。また、検知平面Ａ上の任意の一点Ｐ２と受光素子２
の正面方向に伸びた軸Ｘ１とが受光素子２について成す
角θ２が最大視野角θ１より小さい場合にあっては、前
記一点Ｐ２からの光は直接受光素子２に入光するととも
に、反射板３に反射して受光素子２に入光する。従っ
て、反射板３は最大視野角θ１内の光を受光素子２に集
光する。The reflecting plate 3 is specifically constructed as follows. That is, the reflection plate 3 is a substantially bowl-shaped body having an open lower surface. Then, as shown in FIG. 2, light from one point P1 on the detection plane A in the direction of the maximum viewing angle θ1 of the light receiving element 2 is reflected by the opening end 3a of the reflection plate 3, and the reflected light is received. The reflection plate 3 is formed to be curved so as to enter the element 2. An arbitrary point P2 on the detection plane A and the light receiving element 2
When the angle θ2 formed by the light receiving element 2 with the axis X1 extending in the front direction is smaller than the maximum viewing angle θ1, the light from the point P2 directly enters the light receiving element 2 and the reflecting plate 3 And enters the light receiving element 2. Therefore, the reflector 3 condenses the light within the maximum viewing angle θ1 on the light receiving element 2.
【００１８】次に、反射板３の内面は開口端部３ａから
基端部３ｂにかけて徐々に反射率が低くなるように構成
してある。Next, the inner surface of the reflecting plate 3 is configured so that the reflectance gradually decreases from the opening end 3a to the base end 3b.
【００１９】ここで検知平面Ａ上の一点Ｐ２と受光素子
２の正面方向に伸びた軸Ｘ１とが受光素子２について成
す角が角θ２である場合に、一点Ｐ２で大きさ「１」の
大きさの光が受光素子２に向けて照射されるとすると、
受光素子２は（ cosθ２）の４乗の大きさの光を受光す
ることになる。これは、図３に示すように、一点Ｐ２が
照射する光の受光素子方向の成分の大きさが cosθ２で
あり、受光素子２の感度も正面方向を１とすると一点Ｐ
２方向の成分の大きさが cosθ２となり、更に光量は距
離の２乗に反比例するからである。即ち、図３中受光素
子２の直下の点Ｐ３において「１」の大きさの光が受光
素子２に照射されたときに受光素子２が「１」の光量を
受光することができるとすると、点Ｐ２において「１」
の大きさの光が受光素子２に照射された場合には受光素
子２は（ cosθ２）の４乗の光量を受光する。Here, when the angle formed between the point P2 on the detection plane A and the axis X1 extending in the front direction of the light receiving element 2 with respect to the light receiving element 2 is the angle θ2, the size of the point "P2" is "1". If the light is irradiated toward the light receiving element 2,
The light receiving element 2 receives light having a magnitude of the fourth power of (cos θ2). This is because, as shown in FIG. 3, the magnitude of the component of the light irradiated at one point P2 in the light receiving element direction is cos θ2, and the sensitivity of the light receiving element 2 is one point P2 when the front direction is 1.
This is because the magnitude of the component in the two directions is cos θ2, and the light amount is inversely proportional to the square of the distance. That is, assuming that the light receiving element 2 can receive the light amount of “1” when the light having the size of “1” is irradiated on the light receiving element 2 at a point P3 immediately below the light receiving element 2 in FIG. "1" at point P2
Is irradiated on the light receiving element 2, the light receiving element 2 receives a light amount of the fourth power of (cos θ2).
【００２０】従って、点Ｐ２からの光を受光した場合と
点Ｐ３からの光を受光した場合とでは、点Ｐ２からの光
を受光した場合のほうが（１−（ cosθ２）の４乗）だ
け受光素子２の受光量が少ない。Therefore, between the case where light from the point P2 is received and the case where light from the point P3 is received, the case where light from the point P2 is received is only (1- (cos θ2) to the fourth power). The amount of light received by the element 2 is small.
【００２１】そこで、反射板３の反射率は、点Ｐ２から
の光を受光素子２に向けて反射することにより、受光素
子２において（１−（ cosθ２）の４乗）の受光量を補
うことができるものとしている。Therefore, the reflectivity of the reflecting plate 3 is to compensate for the light receiving amount of (1- (cos θ2) to the fourth power) in the light receiving element 2 by reflecting the light from the point P2 toward the light receiving element 2. Can be done.
【００２２】該構成により、受光素子２は点Ｐ２から直
接入射する光によって（ cosθ２）の４乗の光量を受光
し、点Ｐ２から反射板３に反射して受光素子２に至る光
によって（１−（ cosθ２）の４乗）の光量を受光し
て、結果として合計で「１」の光量を受光することがで
きる。よって、受光素子２は最大視野角θ１内では感度
を均一のものとすることができ、感度特性を広域平均形
となすことができる。With this structure, the light receiving element 2 receives the fourth power of (cos θ2) by the light directly incident from the point P2, and reflects (1) by the light reflected from the point P2 to the reflecting plate 3 and reaching the light receiving element 2. − (Cos θ2) to the fourth power), and as a result, a total of “1” light can be received. Therefore, the light receiving element 2 can have uniform sensitivity within the maximum viewing angle θ1, and can have a wide-range average sensitivity characteristic.
【００２３】また、フィルタを用いていないので、受光
素子２の正面方向からの光も減光させることなく、よっ
て受光素子２の受光量が減少することもない。Further, since no filter is used, the light from the front of the light receiving element 2 is not reduced, so that the light receiving amount of the light receiving element 2 is not reduced.
【００２４】また、図４では他の例として受光装置１
を、被取付部材に相当する火災報知機Ｂの下面に取り付
けて構成してある。該構成の受光装置１にあっては、受
光装置１を火災報知機Ｂを天井に取り付けることによ
り、受光装置１も天井に取り付けられることとなる。よ
って、受光装置１のみを取り付けるという作業が不要で
あるという利点がある。FIG. 4 shows another example of the light receiving device 1.
Is attached to the lower surface of the fire alarm B corresponding to the member to be attached. In the light receiving device 1 having such a configuration, the light receiving device 1 is mounted on the ceiling by mounting the fire alarm B on the ceiling. Therefore, there is an advantage that the work of attaching only the light receiving device 1 is unnecessary.
【００２５】〔第二実施の形態〕図５は受光装置の構成
を示す側面図である。図６はフィルタの平面図である。
図７はフィルタの光透過率と受光方向との関係を示す説
明図である。[Second Embodiment] FIG. 5 is a side view showing the structure of a light receiving device. FIG. 6 is a plan view of the filter.
FIG. 7 is an explanatory diagram showing the relationship between the light transmittance of the filter and the light receiving direction.
【００２６】図５において、天井面Ｔに取り付けられた
受光装置４は受光素子５と、フィルタ６とを有して構成
してある。受光素子５は検知領域からの光を受光して受
光量を検知するものである。フィルタ６は、受光素子５
の感度特性を補正するものであって、中心部分の光透過
率が最も低く外側に行くに従って光透過率が同心円状に
徐々に高くなっているものである。In FIG. 5, the light receiving device 4 attached to the ceiling surface T includes a light receiving element 5 and a filter 6. The light receiving element 5 detects the amount of received light by receiving light from the detection area. The filter 6 includes a light receiving element 5
The light transmittance of the central portion is lowest and the light transmittance gradually increases concentrically toward the outside.
【００２７】詳しくは、図６に示すように、フィルタ６
は光を透過する透明部材で形成した円形板状体に、光を
透過しない円形のドット模様６ａ，６ｂ，６ｃ…を複数
付して受光素子の検知領域に臨む側に配設したフィルタ
である。そして、該ドット模様６ａ，６ｂ，６ｃ…はフ
ィルタの中心部分に存在するドット模様６ａ等の直径を
大きくし、フィルタ６の周縁部分に存在するドット模様
６ｃ等がフィルタ６の中心部分に存在するドットの直径
より小さくなるように、徐々にドット模様の直径を変化
させてある。More specifically, as shown in FIG.
Is a filter formed by attaching a plurality of circular dot patterns 6a, 6b, 6c... That do not transmit light to a circular plate-like body formed of a transparent member that transmits light, and disposed on the side facing the detection area of the light receiving element. . The dot patterns 6a, 6b, 6c... Increase the diameter of the dot pattern 6a and the like existing at the center of the filter, and the dot patterns 6c and the like existing at the periphery of the filter 6 exist at the center of the filter 6. The diameter of the dot pattern is gradually changed so as to be smaller than the diameter of the dot.
【００２８】該構成のフィルタ６は、図７に示すよう
に、例えば角度が０度の正面方向からの入射光に対して
は光透過率を約２５％とし、また正面方向から４０度の
角度を成す方向からの入射光に対しては光透過率を約７
２％として、受光素子５の感度の高い受光方向の感度を
下げて受光素子５の受光方向に対する感度特性を略均一
にしている。As shown in FIG. 7, the filter 6 having the above configuration has a light transmittance of about 25% with respect to incident light from a front direction having an angle of 0 degrees, and has an angle of 40 degrees from the front direction. About 7 for incident light from the direction of
As 2%, the sensitivity of the light receiving element 5 in the light receiving direction with high sensitivity is lowered to make the sensitivity characteristics of the light receiving element 5 in the light receiving direction substantially uniform.
【００２９】従って、従来の技術で説明したフィルタの
ように光透過率の低いフィルタの中心部分にあってもド
ットを密にするのではなく、本発明の受光装置のフィル
タはドットの大きさを大きくしているものであるから、
印刷時にドットとドットの距離が短くなって両ドットが
結合等することなく、印刷ムラの生じにくいものとなっ
ている。よって、簡易な構成で受光素子の感度特性を広
域平均形になすことができる。Therefore, the filter of the light-receiving device of the present invention does not reduce the density of dots even in the center of a filter having a low light transmittance as in the filter described in the background art. Because it is bigger,
At the time of printing, the distance between dots becomes short, and the two dots do not combine, etc., so that printing unevenness is unlikely to occur. Therefore, the sensitivity characteristics of the light receiving element can be made to have a wide area average shape with a simple configuration.
【００３０】〔第三実施の形態〕図８は受光装置の構成
を示す側面図である。[Third Embodiment] FIG. 8 is a side view showing the structure of a light receiving device.
【００３１】図８において、天井面Ｔに取り付けられた
受光装置は受光素子７とフィルタ８とを有して構成して
ある。受光素子７は検知領域からの光を受光して受光量
を検知するものである。Referring to FIG. 8, the light receiving device mounted on the ceiling surface T includes a light receiving element 7 and a filter 8. The light receiving element 7 detects light received by receiving light from the detection area.
【００３２】フィルタ８は受光素子７の検知領域に臨む
側に設けられ、中心から一定半径内における透過率が低
い低透過率部８ａと、一定半径外における透過率の高い
高透過率部８ｂとの２段階の透過率を有するフィルタで
ある。そして、前記受光素子７の受光面７ａをフィルタ
８上の各所に投影した場合に、フィルタ８上の略全ての
位置において受光面７ａの投影された領域は低透過率部
８ａの一部と高透過率部８ｂの一部とを包含するように
なされている。The filter 8 is provided on the side facing the detection area of the light receiving element 7, and includes a low transmittance portion 8a having a low transmittance within a certain radius from the center, and a high transmittance portion 8b having a high transmittance outside the certain radius. This is a filter having a two-stage transmittance. When the light-receiving surface 7a of the light-receiving element 7 is projected to various places on the filter 8, the projected area of the light-receiving surface 7a at almost all positions on the filter 8 is a part of the low transmittance portion 8a and high. It is configured to include a part of the transmittance portion 8b.
【００３３】ところで、従来のフィルタを用いて受光装
置の受光素子とフィルタとの距離は約１５［ｍｍ］程度
であり、フィルタの直径が約３０［ｍｍ］程度であった
から、１［ｍｍ］程度の直径である受光面のフィルタに
対する比率は小さいものであった。By the way, the distance between the light receiving element of the light receiving device and the filter using the conventional filter is about 15 [mm] and the diameter of the filter is about 30 [mm], so that about 1 [mm]. The ratio of the light receiving surface, which is the diameter of the filter, to the filter was small.
【００３４】しかしながら、フィルタ８の直径を受光素
子７の数倍程度となるように小さくし、またフィルタ８
と受光素子７の距離を受光素子７の数倍程度となるよう
に小さくすると、受光素子７の受光面のフィルタ８に対
する比率が大きなものとなり、受光素子７の受光面７ａ
をフィルタ８上の各所に投影した場合に、フィルタ８上
の略全ての位置において受光面７ａの投影された領域は
低透過率部８ａの一部と高透過率部８ｂの一部とを包含
するようになすことができる。However, the diameter of the filter 8 is reduced to be several times the diameter of the light receiving element 7, and
When the distance between the light receiving element 7 and the light receiving element 7 is reduced to be about several times the light receiving element 7, the ratio of the light receiving surface of the light receiving element 7 to the filter 8 becomes large, and the light receiving surface 7a
Is projected on various places on the filter 8, the projected area of the light receiving surface 7a at almost all positions on the filter 8 includes a part of the low transmittance part 8a and a part of the high transmittance part 8b. It can be made to do.
【００３５】そして、該構成によると、受光面７ａと同
幅の光が受光素子７に入光する場合を考えると、該光の
入射角によってフィルタ８を通過する際の透過率の高い
高透過率部８ｂを通過する割合と透過率の低い低透過率
部８ａを通過する割合との比率が異なるものとなる。According to this configuration, considering that light having the same width as the light receiving surface 7a enters the light receiving element 7, a high transmittance having a high transmittance when passing through the filter 8 depending on the incident angle of the light is considered. The ratio of the ratio of passing through the transmittance portion 8b and the ratio of passing through the low transmittance portion 8a having a low transmittance is different.
【００３６】よって、検知領域の周縁部からの光は高透
過率部８ｂを通過する割合が多く低透過率部８ａを通過
する割合が低いので、結果として周縁部からの光は高い
透過率のフィルタを通過するのと同じことになる。一
方、検知領域の中心部近辺からの光は高透過率部８ｂを
通過する割合が少なく低透過率部８ａを通過する割合が
多いので、結果として中心部近辺からの光は低い透過率
のフィルタを通過するのと同じことになる。また、周縁
部と中心部近辺との中間位置からの光は透過率の高透過
率部８ｂと低透過率部８ａとを略半分づつ通過するの
で、結果として周縁部からの光の場合の透過率と中心部
近辺からの光の場合の透過率の中間の透過率のフィルタ
を通過するのと同じことになる。Therefore, the light from the periphery of the detection area passes through the high transmittance portion 8b at a high rate and the low rate through the low transmittance section 8a, and as a result, the light from the periphery has a high transmittance. It is the same as passing through a filter. On the other hand, light from the vicinity of the center of the detection area passes through the high transmittance portion 8b at a low rate and passes through the low transmittance portion 8a at a high rate. As a result, light from the vicinity of the center of the detection area has a low transmittance. Is the same as passing through In addition, light from an intermediate position between the peripheral portion and the vicinity of the center portion passes through the high transmittance portion 8b and the low transmittance portion 8a of the transmittance approximately half at a time, and as a result, the light transmitted from the peripheral portion is transmitted. This is equivalent to passing through a filter having a transmittance between the transmittance and the transmittance in the case of light from near the center.
【００３７】以上の構成の受光装置にあっては、フィル
タ８は透過率を２段階設けるのみであるから、簡易な構
成で受光素子の感度特性を広域平均形になすことができ
る。In the light receiving device having the above-described configuration, the filter 8 is provided with only two levels of transmittance, so that the sensitivity characteristics of the light receiving element can be made to have a wide range average with a simple configuration.
【００３８】なお、本第一実施の形態では、受光装置は
天井面Ｔ又は火災報知機Ｂに取り付けられているものと
して説明しているが、本構成に限られるものではなく、
他の被取付部材に一体として設けたものであってもよ
い。他の被取付部材の具体例としては、図９乃至図１３
に示すようにスプリンクラーＣ、換気扇Ｄ、スピーカ
Ｅ、扇風機Ｆ、エアコンの吹出口Ｇ等がある。受光装置
をこれら被取付部材に一体に設けることにより、受光装
置の取付作業を省略することができるという利点があ
る。In the first embodiment, the light receiving device is described as being attached to the ceiling surface T or the fire alarm B. However, the present invention is not limited to this configuration.
It may be provided integrally with another mounted member. 9 to 13 show specific examples of other attached members.
As shown, there are a sprinkler C, a ventilation fan D, a speaker E, a fan F, an air conditioner outlet G, and the like. By providing the light receiving device integrally with these members to be mounted, there is an advantage that the work of mounting the light receiving device can be omitted.
【００３９】[0039]
【発明の効果】本発明の受光装置は上述のように構成し
てあるから、請求項１記載の発明にあっては、感度特性
補正手段が受光素子の感度の低い受光方向の感度を上げ
ることにより受光素子の受光方向に対する感度特性を略
均一にするので、簡易な構成で受光素子の受光方向に対
する感度特性を広域平均形になすことができ、誤検知の
確率を低減することのできる受光装置を提供できるとい
う効果を奏する。Since the light receiving device of the present invention is constructed as described above, according to the first aspect of the present invention, the sensitivity characteristic correction means increases the sensitivity of the light receiving element in the light receiving direction where the sensitivity is low. Since the sensitivity characteristics of the light receiving element in the light receiving direction are made substantially uniform, the light receiving element of the light receiving element can have a wide-range average sensitivity characteristic in the light receiving direction with a simple configuration, and the probability of erroneous detection can be reduced. Is provided.
【００４０】請求項２記載の発明にあっては、感度特性
補正手段は、受光素子の側方を覆い、受光素子の近傍を
通過する光を反射して受光素子に集光する反射板である
から、簡易な構成で受光素子の受光方向に対する感度特
性を広域平均形になすことができ、誤検知の確率を低減
することのできる受光装置を提供できるという効果を奏
する。According to the second aspect of the present invention, the sensitivity characteristic correcting means is a reflector that covers the side of the light receiving element, reflects light passing near the light receiving element, and condenses the light on the light receiving element. Therefore, it is possible to provide a light-receiving device that can have a wide-range average sensitivity characteristic of the light-receiving element in the light-receiving direction with a simple configuration and that can reduce the probability of erroneous detection.
【００４１】請求項３記載の発明にあっては、感度特性
補正手段は、光を透過する透明部材に光を透過しないド
ット模様を複数付して、受光素子の検知領域に臨む側に
配設したフィルタであって、該フィルタのドット模様は
フィルタの中心部分に存在するドット模様を大きくし、
フィルタの周縁部分に存在するドット模様をフィルタの
中心部分に存在するドット模様より小さくしたものであ
るので、簡易な構成で受光素子の受光方向に対する感度
特性を広域平均形になすことができ、誤検知の確率を低
減することのできる受光装置を提供できるという効果を
奏する。According to the third aspect of the present invention, the sensitivity characteristic correcting means is provided on the transparent member, which transmits light, with a plurality of dot patterns which do not transmit light, and is provided on the side facing the detection area of the light receiving element. Filter, wherein the dot pattern of the filter increases the dot pattern existing in the center of the filter,
Since the dot pattern present at the periphery of the filter is smaller than the dot pattern present at the center of the filter, the sensitivity characteristic of the light receiving element in the light receiving direction can be made to be a wide-range average shape with a simple configuration. This has the effect of providing a light receiving device that can reduce the probability of detection.
【００４２】請求項４記載の発明にあっては、感度特性
補正手段は、中心から一定半径内において透過率が低く
なされた低透過率部と、前記一定半径外において透過率
が高くなされた高透過率部とを有して成り受光素子の検
知領域に臨む側に配設したフィルタであって、前記受光
素子の受光面を前記フィルタ上の各所に投影した場合に
フィルタ上の略全ての位置において前記受光面の投影さ
れた領域は高透過率部と低透過率部とを包含するように
したので、簡易な構成で受光素子の受光方向に対する感
度特性を広域平均形になすことができ、誤検知の確率を
低減することのできる受光装置を提供できるという効果
を奏する。According to a fourth aspect of the present invention, the sensitivity characteristic correcting means includes a low transmittance portion having a low transmittance within a certain radius from the center and a high transmittance portion having a high transmittance outside the certain radius. And a filter disposed on the side facing the detection area of the light receiving element, wherein the light receiving surface of the light receiving element is projected to various positions on the filter, and substantially all positions on the filter are provided. Since the projected area of the light receiving surface includes a high transmittance portion and a low transmittance portion, the sensitivity characteristic of the light receiving element with respect to the light receiving direction of the light receiving element can be made to have a wide area average shape with a simple configuration. This has the effect of providing a light receiving device that can reduce the probability of erroneous detection.
【００４３】請求項５記載の発明にあっては、前記受光
装置を建物躯体に取付られる被取付部材に取着し成るの
で、被取付部材を建物躯体に取り付けることにより受光
装置も躯体に取り付けられ、受光装置のみを取り付ける
という作業が不要であって取付の容易な受光装置を提供
できるという効果を奏する。According to the fifth aspect of the present invention, since the light receiving device is attached to a member to be attached to the building frame, the light receiving device is also attached to the frame by attaching the member to the building frame. In addition, there is no need to mount only the light receiving device, and the light receiving device can be easily mounted.
【図１】本発明の第一実施の形態の受光装置の一構成例
を示す側面図である。FIG. 1 is a side view illustrating a configuration example of a light receiving device according to a first embodiment of the present invention.
【図２】最大視野角から受光装置に入光する光の説明図
である。FIG. 2 is an explanatory diagram of light that enters a light receiving device from a maximum viewing angle.
【図３】受光装置の検知方向と受光量との関係の説明図
である。FIG. 3 is an explanatory diagram of a relationship between a detection direction of a light receiving device and an amount of received light.
【図４】受光装置を被取付部材に取り付けた状態を説明
するものであり、（ａ）は受光装置を取り付けた火災報
知機の側面図、（ｂ）は受光装置を取り付けた火災報知
機の平面図である。4A and 4B illustrate a state in which the light receiving device is attached to a member to be mounted, wherein FIG. 4A is a side view of a fire alarm to which the light receiving device is attached, and FIG. It is a top view.
【図５】本発明の第二実施の形態の受光装置の一構成例
を示す側面図である。FIG. 5 is a side view illustrating a configuration example of a light receiving device according to a second embodiment of the present invention.
【図６】フィルタの平面図である。FIG. 6 is a plan view of a filter.
【図７】フィルタの光透過率と受光方向との関係を示す
説明図である。FIG. 7 is an explanatory diagram showing a relationship between a light transmittance of a filter and a light receiving direction.
【図８】本発明の第三実施の形態の受光装置の一構成例
を示す側面図である。FIG. 8 is a side view illustrating a configuration example of a light receiving device according to a third embodiment of the present invention.
【図９】受光装置を被取付部材に取り付けた状態を説明
するものであり、（ａ）は受光装置を取り付けたスプリ
ンクラーの側面図、（ｂ）は受光装置を取り付けたスプ
リンクラーの平面図である。FIGS. 9A and 9B illustrate a state in which the light receiving device is attached to a member to be attached. FIG. 9A is a side view of the sprinkler to which the light receiving device is attached, and FIG. 9B is a plan view of the sprinkler to which the light receiving device is attached. .
【図１０】受光装置を換気扇に取り付けた状態を示す平
面図である。FIG. 10 is a plan view showing a state in which the light receiving device is attached to a ventilation fan.
【図１１】受光装置をスピーカに取り付けた状態を示す
平面図である。FIG. 11 is a plan view showing a state in which the light receiving device is attached to a speaker.
【図１２】受光装置を被取付部材に取り付けた状態を説
明するものであり、（ａ）は受光装置を取り付けた扇風
機の側面図、（ｂ）は受光装置を取り付けた扇風機の平
面図である。12A and 12B illustrate a state in which the light receiving device is attached to a member to be attached, wherein FIG. 12A is a side view of the electric fan to which the light receiving device is attached, and FIG. 12B is a plan view of the electric fan to which the light receiving device is attached. .
【図１３】受光装置をエアコンの吹出口に取り付けた状
態を示す平面図である。FIG. 13 is a plan view showing a state in which the light receiving device is attached to an air outlet of an air conditioner.
１ 受光装置 ２ 受光素子 ３ 感度特性補正手段 ６ 感度特性補正手段 ６ａ ドット模様 ６ｂ ドット模様 ６ｃ ドット模様 ８ 感度特性補正手段 ８ｂ 高透過率部 ８ａ 低透過率部 Ｂ 被取付部材 Ｃ 被取付部材 Ｄ 被取付部材 Ｅ 被取付部材 Ｆ 被取付部材 Ｇ 被取付部材 Reference Signs List 1 light receiving device 2 light receiving element 3 sensitivity characteristic correcting means 6 sensitivity characteristic correcting means 6a dot pattern 6b dot pattern 6c dot pattern 8 sensitivity characteristic correcting means 8b high transmittance portion 8a low transmittance portion B mounting member C mounting member D mounting member Attachment member E Attachment member F Attachment member G Attachment member
Claims (5)
子を備えた受光装置において、 前記受光素子の感度の低い受光方向の感度を上げること
により受光素子の受光方向に対する感度特性を略均一に
する感度特性補正手段を設けたことを特徴とする受光装
置。1. A light-receiving device comprising a light-receiving element for receiving light reflected from a surface to be illuminated, wherein sensitivity of the light-receiving element in a light-receiving direction with a low sensitivity is substantially uniform by increasing sensitivity of the light-receiving element in a light-receiving direction. 1. A light receiving device comprising a sensitivity characteristic correcting means.
方を覆い、受光素子の近傍を通過する光を反射して受光
素子に集光する反射板であることを特徴とする請求項１
記載の受光装置。2. The apparatus according to claim 1, wherein the sensitivity characteristic correcting means is a reflector that covers a side of the light receiving element, reflects light passing near the light receiving element, and condenses the light on the light receiving element.
The light receiving device according to the above.
子と、該受光素子の感度の高い受光方向の感度を下げる
ことにより受光素子の受光方向に対する感度特性を略均
一にする感度特性補正手段と、を備えた受光装置におい
て、 前記感度特性補正手段は、光を透過する透明部材に光を
透過しないドット模様 を複数付して、前記受光素子の検知領域に臨む側に配設
したフィルタであって、該フィルタのドット模様はフィ
ルタの中心部分に存在するドット模様を大きくし、フィ
ルタの周縁部分に存在するドット模様をフィルタの中心
部分に存在するドット模様より小さくしたものであるこ
とを特徴とする受光装置。3. A light-receiving element for receiving light reflected from a surface to be illuminated, and sensitivity characteristic correction for reducing the sensitivity of the light-receiving element in the light-receiving direction with high sensitivity to make the sensitivity characteristic of the light-receiving element in the light-receiving direction substantially uniform. A light-transmitting transparent member having a plurality of dot patterns that do not transmit light, and a filter disposed on a side facing a detection area of the light-receiving element. The dot pattern of the filter has a larger dot pattern existing at the center of the filter, and has a smaller dot pattern existing at the periphery of the filter than the dot pattern existing at the center of the filter. Characteristic light receiving device.
子と、該受光素子の感度の高い受光方向の感度を下げる
ことにより受光素子の受光方向に対する感度特性を略均
一にする感度特性補正手段と、を備えた受光装置におい
て、 前記感度特性補正手段は、中心から一定半径内において
透過率が低くなされた低透過率部と、前記一定半径外に
おいて透過率が高くなされた高透過率部とを有して成り
受光素子の検知領域に臨む側に配設したフィルタであっ
て、前記受光素子の受光面を前記フィルタ上の各所に投
影した場合にフィルタ上の略全ての位置において前記受
光面の投影された領域は高透過率部と低透過率部とを包
含することを特徴とする受光装置。4. A light-receiving element for receiving light reflected from a surface to be illuminated, and a sensitivity characteristic correction for reducing the sensitivity of the light-receiving element in a light-receiving direction having a high sensitivity so that the sensitivity characteristic of the light-receiving element in the light-receiving direction is substantially uniform. Means, wherein the sensitivity characteristic correction means comprises: a low transmittance portion having a low transmittance within a certain radius from the center; and a high transmittance portion having a high transmittance outside the certain radius. And a filter disposed on the side facing the detection area of the light receiving element, wherein the light receiving surface is projected at almost all positions on the filter when the light receiving surface of the light receiving element is projected to various places on the filter. A light receiving device, wherein the projected area of the surface includes a high transmittance portion and a low transmittance portion.
取付部材に取着して成ることを特徴とする請求項１乃至
請求項４記載のいずれかに記載の受光装置。5. The light receiving device according to claim 1, wherein the light receiving device is attached to a member to be mounted attached to a building frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9234118A JPH1172385A (en) | 1997-08-29 | 1997-08-29 | Light receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9234118A JPH1172385A (en) | 1997-08-29 | 1997-08-29 | Light receiving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1172385A true JPH1172385A (en) | 1999-03-16 |
Family
ID=16965924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9234118A Pending JPH1172385A (en) | 1997-08-29 | 1997-08-29 | Light receiving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1172385A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019132451A (en) * | 2018-01-29 | 2019-08-08 | 東芝キヤリア株式会社 | Air conditioner indoor unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61265535A (en) * | 1985-05-20 | 1986-11-25 | Matsushita Electric Ind Co Ltd | Apparatus for measuring luminous intensity |
| JPS6276419A (en) * | 1985-09-18 | 1987-04-08 | Chino Corp | Detecting device for invading body or others |
| JPH07270235A (en) * | 1994-03-31 | 1995-10-20 | Endo Shomei:Kk | Photoelectric element directive characteristic correction filter for illuminance sensor for dimming |
| JPH08170930A (en) * | 1994-12-19 | 1996-07-02 | Matsushita Electric Ind Co Ltd | Infrared ray detecting device |
| JPH09145469A (en) * | 1995-11-20 | 1997-06-06 | Mitsubishi Electric Corp | Illuminance light receiving device |
-
1997
- 1997-08-29 JP JP9234118A patent/JPH1172385A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61265535A (en) * | 1985-05-20 | 1986-11-25 | Matsushita Electric Ind Co Ltd | Apparatus for measuring luminous intensity |
| JPS6276419A (en) * | 1985-09-18 | 1987-04-08 | Chino Corp | Detecting device for invading body or others |
| JPH07270235A (en) * | 1994-03-31 | 1995-10-20 | Endo Shomei:Kk | Photoelectric element directive characteristic correction filter for illuminance sensor for dimming |
| JPH08170930A (en) * | 1994-12-19 | 1996-07-02 | Matsushita Electric Ind Co Ltd | Infrared ray detecting device |
| JPH09145469A (en) * | 1995-11-20 | 1997-06-06 | Mitsubishi Electric Corp | Illuminance light receiving device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019132451A (en) * | 2018-01-29 | 2019-08-08 | 東芝キヤリア株式会社 | Air conditioner indoor unit |
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