JP2011113673A - Lighting system - Google Patents

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JP2011113673A
JP2011113673A JP2009266579A JP2009266579A JP2011113673A JP 2011113673 A JP2011113673 A JP 2011113673A JP 2009266579 A JP2009266579 A JP 2009266579A JP 2009266579 A JP2009266579 A JP 2009266579A JP 2011113673 A JP2011113673 A JP 2011113673A
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light
led
lighting device
light emitting
emitting diodes
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JP5476101B2 (en
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Yoji Tateno
洋司 立野
Koji Yamashita
浩司 山下
Jun Matsuzaki
純 松▲崎▼
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Panasonic Electric Works Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To control a light quantity of each LED at a desired value with the use of the smaller number of light quantity sensors than the number of LEDs, for a lighting device using a plurality of LEDs as a light source. <P>SOLUTION: An LED current adjustment part 13 controls each LED 9a, 9b with two kinds of emission patterns of turning on one and turning off the other of the two LEDs 9a, 9b as an LED light quantity adjustment operation, a light quantity of leaked light in each case is detected through a light quantity sensor 10, and an operation of adjusting an LED current of each LED 9a, 9b is carried out so that the volume of the leaked light is contained within a given target range preset in accordance with each emission pattern. The LED current adjustment part 13 controls an LED current of each LED 9a, 9b based on the value of the LED current set by the LED light quantity adjustment operation when the LED light quantity adjustment operation is not carried out, so that a light quantity of each LED 9a, 9b can be controlled at a desired value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、誘導灯などの照明装置において、特に光源に複数の発光ダイオードを用いた照明装置に関するものである。   The present invention relates to an illumination device such as a guide lamp, and more particularly to an illumination device using a plurality of light emitting diodes as a light source.

従来、導光板の側面に対向するように線状光源を配置し、線状光源から放射された線状（帯状）の光を導光板によって面状の光に変換して、導光板の出射面に対向して配設された表示パネルを照明する照明装置がある。   Conventionally, a linear light source is disposed so as to face the side surface of the light guide plate, and linear (strip-shaped) light radiated from the linear light source is converted into planar light by the light guide plate, and the light exit surface of the light guide plate There is an illuminating device that illuminates a display panel that is disposed opposite to the display panel.

このような照明装置の線状光源としては、冷陰極ランプ（例えば、特許文献１参照）や、ＬＥＤ（発光ダイオード）を一列に並べて配置したもの（例えば、特許文献２参照）が用いられてきた。   As a linear light source of such an illuminating device, a cold cathode lamp (for example, refer to Patent Document 1) or an LED (light emitting diode) arranged in a line (for example, refer to Patent Document 2) has been used. .

また、線状光源として、柱状の線状導光体と点光源（ＬＥＤ）とを用いた照明装置も、提案されている（例えば、特許文献３参照）。本従来例では、ＬＥＤを線状導光体の底面に対向して配置している。このＬＥＤから放射された光は、底面から線状導光体の内部に入射し、線状導光体の一側面である反射面で反射されて、反射面と対向する出射面から線状に放射される。この線状の光は、導光板によって面状の光に変換され、導光板の出射面から放射される。本従来例では、光源にＬＥＤを用いることで低消費電力・長寿命が実現され、また、点光源であるＬＥＤの光を線状導光体によって線状の光に変換しているので、線状光源としてＬＥＤを一列に並べて配置した照明装置に比べて、色ムラが発生しにくいという特徴がある。   Moreover, the illuminating device using a columnar linear light guide and a point light source (LED) as a linear light source is also proposed (for example, refer patent document 3). In this conventional example, the LED is disposed to face the bottom surface of the linear light guide. The light emitted from this LED enters the inside of the linear light guide from the bottom, is reflected by the reflective surface that is one side of the linear light guide, and is linear from the output surface facing the reflective surface. Radiated. This linear light is converted into planar light by the light guide plate and is emitted from the exit surface of the light guide plate. In this conventional example, low power consumption and long life are realized by using an LED as a light source, and the light of the LED as a point light source is converted into linear light by a linear light guide. Compared to a lighting device in which LEDs are arranged in a line as a shape light source, color unevenness is less likely to occur.

特開２００１−２４９０９号公報JP 2001-24909 A 特開２００８−９８２９０号公報JP 2008-98290 A 特許４１４１７６６号公報Japanese Patent No. 4141766

ところで、一般用照明器具に使用されるＬＥＤの寿命は、ＪＩＬ５００６（白色ＬＥＤ照明器具性能要求事項）にて、全光束または光度が初期値の７０％になったときと定められている。また、一般にＬＥＤの光量は素子毎のばらつきが大きく、ランク指定などにより細分化した後でも２０％程度のばらつきがある。よって、光量の小さなＬＥＤの寿命末期時の光量は、光量の大きなＬＥＤの初期の光量と比べて、４０〜５０％程度小さいことになる。従って、光源にＬＥＤを用いた照明装置では、ＬＥＤの寿命末期時には、初期設定値よりも４０〜５０％程度光量が低下するおそれがある。   By the way, the lifetime of the LED used for the general lighting fixture is determined by JIL5006 (white LED lighting fixture performance requirement) when the total luminous flux or luminous intensity becomes 70% of the initial value. In general, the amount of light of the LED varies greatly from element to element, and there is a variation of about 20% even after being subdivided by rank designation or the like. Therefore, the light amount at the end of the lifetime of the LED with a small light amount is about 40 to 50% smaller than the initial light amount of the LED with a large light amount. Therefore, in an illuminating device using an LED as a light source, the light amount may be reduced by about 40 to 50% from the initial set value at the end of the life of the LED.

一般に、照明装置はただ点灯すればよいというものではなく、所定の光量が要求されることが多い。例えば誘導灯では、ＪＩＬ５５０２（誘導灯器具及び避難誘導システム用装置技術基準）にて、満たすべき表示面の平均輝度が定められている。一例として、表示面の縦寸法が２００ｍｍ以上４００ｍｍ未満であるＢ級の誘導灯で必要とされる平均輝度は、表示面平均輝度が高いＢ級ＢＨ形、表示面平均輝度が低いＢ級ＢＬ形それぞれにおいて、図６に示すとおりである。従って、例えばＢ級ＢＨ形の避難口誘導灯において、ＬＥＤの寿命末期時に通常時の平均輝度の下限値（５００ｃｄ／ｍ２）を満たすためには、光束減退を４０％とすると、初期の平均輝度を８３３ｃｄ／ｍ２に設定する必要があり、ＪＩＬ５５０２に定められた上限値（８００ｃｄ／ｍ２）を超えてしまうことになる。このように、ＬＥＤを光源に用いた照明装置では、ＬＥＤの寿命末期時の光束減退のために、所望の光量が得られないおそれがあるという問題があった。 In general, the lighting device is not simply turned on, and a predetermined amount of light is often required. For example, for guide lights, the average luminance of the display surface to be satisfied is defined in JIL5502 (Guide for equipment for guide light fixtures and evacuation guidance systems). As an example, the average luminance required for a class B guide light whose vertical dimension of the display surface is 200 mm or more and less than 400 mm is a class B BH type with a high display surface average luminance and a class B BL type with a low display surface average luminance. Each is as shown in FIG. Therefore, in order to satisfy the lower limit (500 cd / m 2 ) of normal average brightness at the end of the life of the LED, for example, in a class B BH evacuation exit guide light, if the luminous flux decline is 40%, the initial average You must set the luminance 833cd / m 2, so that exceed the upper limit defined in JIL5502 the (800cd / m 2). Thus, in the illuminating device which used LED for the light source, there existed a problem that there existed a possibility that a desired light quantity might not be obtained for the light beam decline at the end of the lifetime of LED.

上記のような寿命末期時の光束減退を解消するには、表示面の輝度を測定する光量センサを設け、表示面の輝度が所望の値となるようにＬＥＤの光量を調整するという方法が考えられる。しかしこの方法は、光源として１個のＬＥＤを用いた照明装置では特に問題ないが、光源として複数のＬＥＤを用いた照明装置にこの方法を適用すると、この方法では複数のＬＥＤの光量の総和しか測定できないため、時間経過に伴う各ＬＥＤの光束のばらつきによって、表示面に色ムラが発生してしまうおそれがあった。また、この問題を解消するには、複数のＬＥＤそれぞれに対応して複数の光量センサを設け、表示面の輝度と各光量センサで検出した光量との対応関係を予め求めておき、表示面の輝度が所望の輝度となるように、また表示面に色ムラが生じないように、各ＬＥＤを制御するという方法が考えられるが、この場合にはＬＥＤと同じ数だけ光量センサが必要になってしまうという課題があった。   In order to eliminate the above-described decrease in luminous flux at the end of the life, a method of providing a light amount sensor for measuring the luminance of the display surface and adjusting the light amount of the LED so that the luminance of the display surface becomes a desired value is considered. It is done. However, this method is not particularly problematic for an illuminating device that uses a single LED as a light source. However, when this method is applied to an illuminating device that uses a plurality of LEDs as a light source, this method only provides the sum of the light amounts of the plurality of LEDs. Since measurement cannot be performed, there is a possibility that color unevenness may occur on the display surface due to variations in the luminous flux of each LED over time. In order to solve this problem, a plurality of light quantity sensors are provided corresponding to each of the plurality of LEDs, and the correspondence between the luminance of the display surface and the light quantity detected by each light quantity sensor is obtained in advance. A method is conceivable in which each LED is controlled so that the luminance becomes a desired luminance and color unevenness does not occur on the display surface. In this case, the same number of light quantity sensors as the LEDs are required. There was a problem of ending up.

本発明は上記事情に鑑みて為されたものであり、光源として複数のＬＥＤ素子を用い、ＬＥＤの個数よりも少ない個数の光量センサを用いて、個々のＬＥＤをそれぞれ所望の光量で発光させることができる照明装置を提供することを目的とする。   The present invention has been made in view of the above circumstances, and uses a plurality of LED elements as a light source and uses a light quantity sensor smaller in number than the number of LEDs to cause each LED to emit light with a desired light quantity. An object of the present invention is to provide a lighting device that can perform the above-described operation.

上記の目的を達成するために、請求項１の発明は、複数の発光ダイオード及び、底面でこれら発光ダイオードと対向するとともにこれら発光ダイオードから入射された光を線状の光に変換して側面から出射する導光ロッドを有する点灯部と、側端面で前記導光ロッドの側面と光学的に結合されて、この導光ロッドから入射された線状の光を面状の光に変換して出射する導光板と、この導光板から放射された光によって照明される表示パネルと、外部電源に接続されて前記各発光ダイオードを点灯させる点灯装置と、この点灯装置を内部に収容し、前記点灯部及び前記導光板を保持する筐体とを備え、前記点灯部には、前記導光ロッドからの漏れ光を検出することによって、前記複数の発光ダイオードから放射される光の光量を検出する光量センサが備えられており、前記点灯装置は、ＬＥＤ光量調整動作として、前記複数の発光ダイオードのうち少なくとも一つは点灯させて残りは消灯させるような発光パターンで前記各発光ダイオードを点灯させ、このときの前記漏れ光の光量を前記光量センサを介して検出し、この検出された光量が当該発光パターンに対応した所定の目標範囲内に収まるように前記各発光ダイオードの光量を調整する動作を行い、この点灯装置は、前記ＬＥＤ光量調整動作で調整された前記各発光ダイオードの光量に基づいて、前記各発光ダイオードを点灯させることを特徴とする。   In order to achieve the above-mentioned object, the invention of claim 1 is directed to a plurality of light emitting diodes and the light emitting diodes facing the light emitting diodes at the bottom and converting the light incident from these light emitting diodes into linear light from the side surface. A lighting part having a light guide rod to be emitted and optically coupled to a side surface of the light guide rod at a side end face, and linear light incident from the light guide rod is converted into a planar light and emitted. A light guide plate, a display panel illuminated by light emitted from the light guide plate, a lighting device that is connected to an external power source and lights each of the light emitting diodes, and the lighting device is housed inside the lighting unit. And a housing for holding the light guide plate, and the lighting section detects a light amount emitted from the plurality of light emitting diodes by detecting leakage light from the light guide rod. The lighting device, as an LED light quantity adjustment operation, lights each light emitting diode with a light emitting pattern in which at least one of the plurality of light emitting diodes is turned on and the remaining light is turned off. The light amount of the leakage light is detected through the light amount sensor, and the light amount of each light emitting diode is adjusted so that the detected light amount falls within a predetermined target range corresponding to the light emission pattern. The lighting device lights each light emitting diode based on the light amount of each light emitting diode adjusted by the LED light amount adjusting operation.

請求項１の発明では、点灯装置がＬＥＤ光量調整動作を行うことで、例えば１個の光量センサだけで、複数の発光ダイオードの個々の光量を設定することができる。すなわち、点灯装置には、予め、複数の発光ダイオードのうちいくつかを点灯させ残りを消灯させるようなある発光パターンに対して、光量センサで検出される光量の目標値が定められている。そしてこの点灯装置は、上記発光パターンで複数の発光ダイオードを点灯させて、このときに光量センサで検出された光量が上記目標値に等しくなるように、各発光ダイオードの光量を調整する。このような調整を、発光パターンを変更しながら複数回行うことによって、各発光ダイオードの光量をそれぞれ所定の値に設定することができるのである。なお、例えば発光ダイオードが対称に配置された照明装置などでは、各発光ダイオードの光量が等しくなるように各発光ダイオードを点灯させることで、表示面での色ムラをなくすことができる。また、本発明を誘導灯に適用する場合には、すべての発光ダイオードを点灯させたときの表示パネルの輝度が、ＪＩＬ規格で定められた目標範囲内に収まるように、各発光パターンの光量の目標値を定めておくことで、すべての発光ダイオードを点灯させたときに適切にＪＩＬ規格を満たすことができる。   In the first aspect of the invention, the lighting device performs the LED light amount adjustment operation, so that the individual light amounts of the plurality of light emitting diodes can be set with only one light amount sensor, for example. That is, in the lighting device, a target value of the amount of light detected by the light amount sensor is determined in advance for a certain light emission pattern in which some of the plurality of light emitting diodes are turned on and the rest are turned off. Then, the lighting device lights a plurality of light emitting diodes with the light emission pattern, and adjusts the light amount of each light emitting diode so that the light amount detected by the light amount sensor at this time becomes equal to the target value. By performing such adjustment a plurality of times while changing the light emission pattern, the light quantity of each light emitting diode can be set to a predetermined value. For example, in an illumination device in which light emitting diodes are arranged symmetrically, color unevenness on the display surface can be eliminated by lighting each light emitting diode so that the amount of light from each light emitting diode becomes equal. When the present invention is applied to a guide light, the light intensity of each light emission pattern is adjusted so that the brightness of the display panel when all the light emitting diodes are turned on falls within the target range defined by the JIL standard. By setting the target value, it is possible to appropriately satisfy the JIL standard when all the light emitting diodes are turned on.

請求項２の発明は、請求項１記載の発明において、前記点灯装置は、初期電源投入時に前記ＬＥＤ光量調整動作を行うことを特徴とする。   According to a second aspect of the present invention, in the first aspect of the present invention, the lighting device performs the LED light amount adjustment operation when an initial power is turned on.

請求項２の発明では、初期電源投入時にＬＥＤ光量調整動作を行うことによって、設置場所の外部光の影響を考慮して、各発光ダイオードの光量を決めることができる。   In the invention of claim 2, by performing the LED light amount adjustment operation when the initial power is turned on, the light amount of each light emitting diode can be determined in consideration of the influence of the external light at the installation location.

請求項３の発明は、請求項１記載の発明において、前記点灯装置は、定期的に前記ＬＥＤ光量調整動作を行うことを特徴とする。   According to a third aspect of the invention, in the first aspect of the invention, the lighting device periodically performs the LED light amount adjustment operation.

請求項３の発明では、定期的にＬＥＤ光量調整動作を行うことによって、各発光ダイオードの光量が寿命で劣化しても、これを補正することができる。   In the invention of claim 3, by performing the LED light amount adjustment operation periodically, even if the light amount of each light emitting diode is deteriorated due to the lifetime, this can be corrected.

請求項４の発明は、請求項１〜３のいずれか一項記載の発明において、前記光量センサは、前記ＬＥＤ光量調整動作を行う際にだけ、給電が入切されることを特徴とする。   According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the light amount sensor is turned on and off only when performing the LED light amount adjustment operation.

請求項４の発明では、ＬＥＤ光量調整動作を行うときにだけ光量センサに電力を供給することで、省エネを実現できる。   According to the fourth aspect of the present invention, energy can be saved by supplying power to the light quantity sensor only when the LED light quantity adjustment operation is performed.

請求項５の発明は、請求項１〜４のいずれか一項記載の発明において、前記点灯装置は、前記ＬＥＤ光量調整動作を行う際には、人間の目が明るさのちらつきを感知できない程度の早い周期で、前記発光パターンを切り替えることを特徴とする。   According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, when the lighting device performs the LED light amount adjustment operation, a human eye cannot detect a flicker of brightness. The light emission pattern is switched at an early cycle.

請求項５の発明では、発光ダイオードの発光パターンを切り替える際に、人間の目に見えない程度の早い周期で発光パターンを切り替えることで、ＬＥＤ光量調整動作を行う際に外観上の見栄えが悪くなるのを防ぐことができる。   In the invention of claim 5, when the light emission pattern of the light emitting diode is switched, the light emission pattern is switched at an early cycle that is not visible to human eyes, so that the appearance of the LED light is poor when performing the LED light amount adjustment operation. Can be prevented.

請求項６の発明は、請求項１〜５のいずれか一項記載の発明において、前記筐体の内部には二次電池が備えられており、前記点灯装置は、前記外部電源からの電力供給により前記二次電池を充電する充電回路部と、前記外部電源又は前記二次電池からの電力供給により前記発光ダイオードを点灯させる点灯回路部とを備え、前記点灯装置は、前記ＬＥＤ光量調整動作を行う際には、前記外部電源からの電力供給で前記発光ダイオードを点灯させる場合と、前記二次電池からの電力供給でこれら発光ダイオードを点灯させる場合とで、前記光量センサで検出される光量の目標範囲が同じ発光パターンに対して異なる値となるように、前記各発光ダイオードの光量を調整することを特徴とする。   According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, a secondary battery is provided inside the casing, and the lighting device supplies power from the external power source. A charging circuit unit that charges the secondary battery, and a lighting circuit unit that lights the light-emitting diode by power supply from the external power source or the secondary battery, and the lighting device performs the LED light amount adjustment operation. When performing, when the light emitting diodes are turned on by power supply from the external power supply, and when the light emitting diodes are turned on by power supply from the secondary battery, The amount of light of each of the light emitting diodes is adjusted so that the target range has different values for the same light emission pattern.

請求項６の発明では、筐体内に二次電池を備えることで、停電時でも発光ダイオードを点灯させることができる。また、商用電源から給電される場合と二次電池から給電される場合とで、同じ発光パターンに対して光量の目標範囲を異ならしめているので、商用電源から給電される場合と二次電池から給電される場合とで、異なる輝度で表示パネルを照明することができる。よって、例えば本発明を誘導灯に適用した場合には、通常時には商用電源から電力を供給し、非常時には二次電池から電力を供給して、異なる光量で各発光ダイオードを点灯させることで、通常時・非常時双方において適切にＪＩＬ規格を満たすことができる。   In the invention of claim 6, by providing the secondary battery in the housing, the light emitting diode can be turned on even during a power failure. In addition, the target range of the amount of light is different for the same light emission pattern depending on whether the power is supplied from the commercial power source or the secondary battery, so the power is supplied from the commercial power source or from the secondary battery. The display panel can be illuminated with different brightness. Thus, for example, when the present invention is applied to a guide light, power is normally supplied from a commercial power source, and power is supplied from a secondary battery in an emergency, so that each light emitting diode is turned on with a different amount of light. JIL standards can be properly met in both emergency and emergency situations.

請求項７の発明は、請求項１〜６のいずれか一項記載の発明において、前記点灯装置は、前記複数の発光ダイオードに流すＬＥＤ電流を調整するＬＥＤ電流調整部を備え、前記点灯装置は、前記ＬＥＤ光量調整動作を行う際には、前記ＬＥＤ電流調整部で前記ＬＥＤ電流を調整することによって、前記各発光ダイオードの光量を調整することを特徴とする。   The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the lighting device includes an LED current adjusting unit that adjusts an LED current to be passed through the plurality of light emitting diodes, and the lighting device includes: When performing the LED light amount adjustment operation, the LED current adjustment unit adjusts the LED current to adjust the light amount of each light emitting diode.

請求項７の発明では、ＬＥＤ電流調整部でＬＥＤ電流を調整することによって、各発光ダイオードの光量を調整することができる。   In the invention of claim 7, the light quantity of each light emitting diode can be adjusted by adjusting the LED current by the LED current adjusting section.

本発明は、光源として複数のＬＥＤ素子を用い、ＬＥＤの個数よりも少ない個数の光量センサを用いて、個々のＬＥＤをそれぞれ所望の光量で発光させることができる照明装置を提供することができる。   The present invention can provide an illuminating device that uses a plurality of LED elements as a light source and can emit light of each LED with a desired light amount by using a light amount sensor smaller than the number of LEDs.

実施形態の断面図である。It is sectional drawing of embodiment. 同上の分解斜視図である。It is an exploded perspective view same as the above. 同上のブロック図である。It is a block diagram same as the above. 電流一定の場合においてＬＥＤの光量の経時変化を表す図である。It is a figure showing the time-dependent change of the light quantity of LED in the case of constant electric current. 別の実施形態の断面図である。It is sectional drawing of another embodiment. ＪＩＬ５５０２で規定された、Ｂ級の誘導灯の必要輝度を表す図である。It is a figure showing the required brightness | luminance of a class B guide light prescribed | regulated by JIL5502.

以下、本発明の技術的思想を誘導灯に適用した実施形態について説明する。ただし、本発明の技術的思想が適用可能な照明装置は、誘導灯に限定されるものではない。   Hereinafter, an embodiment in which the technical idea of the present invention is applied to a guide lamp will be described. However, the illumination device to which the technical idea of the present invention can be applied is not limited to the guide light.

本発明の実施形態を、図１〜図５を参照して説明する。なお、下記説明中での上下左右は図２を基準とし、図２の筐体１から導光板４に向かう向きを前方とする。   An embodiment of the present invention will be described with reference to FIGS. In the following description, up, down, left, and right are based on FIG. 2, and the direction from the housing 1 to the light guide plate 4 in FIG.

本実施形態の照明装置は、図２に示すように、前面開口した略矩形箱形の筐体１の内部に、点灯装置２及び二次電池３を収納し、筐体１の前面を覆うように導光板４、表示パネル５、及び点灯部６を配設してなる。   As shown in FIG. 2, the lighting device according to the present embodiment houses the lighting device 2 and the secondary battery 3 in a substantially rectangular box-shaped housing 1 that is open to the front, and covers the front surface of the housing 1. The light guide plate 4, the display panel 5, and the lighting unit 6 are arranged on the screen.

導光板４は透明アクリル樹脂製であって、上下方向において下側ほど厚さが薄くなるように形成されている。またその後面には、上端面から入射した光を前面に反射するために、ドット印刷などの反射構造が形成されている。   The light guide plate 4 is made of a transparent acrylic resin, and is formed so that the thickness becomes thinner toward the lower side in the vertical direction. Further, a reflection structure such as dot printing is formed on the rear surface in order to reflect light incident from the upper end surface to the front surface.

表示パネル５は、透光性を有するアクリル樹脂製であって、上下左右の寸法が導光板４とほぼ等しくなっており、導光板４の前面を覆うように配置される。またその前面には、例えば避難口へ誘導するためのシンボルが表記されている。   The display panel 5 is made of an acrylic resin having translucency, and has vertical and horizontal dimensions substantially equal to those of the light guide plate 4 and is disposed so as to cover the front surface of the light guide plate 4. Further, on the front surface, for example, a symbol for guiding to an evacuation exit is written.

導光板４及び表示パネル５は、例えば、左右の幅が筐体１の左右幅とほぼ等しく筐体１の上下幅よりも短い上下幅を有し、導光板４及び表示パネル５が上下方向にスライド自在に嵌合される、図示しないパネルケースによって一体となっている。このパネルケースは、例えばねじ止めによって、あるいは筐体１の左右両側面に形成した嵌合凸部をパネルケースの左右両側面に形成した嵌合凹部に嵌合する嵌合手段によってなどの、適宜の保持手段を用いて筐体１に固定される。パネルケースが固定された状態では、筐体１の上面と表示パネル５の上端縁との間には、点灯部６の上下方向とほぼ等しい隙間が形成される。   The light guide plate 4 and the display panel 5 have, for example, a vertical width that is substantially equal to the horizontal width of the housing 1 and shorter than the vertical width of the housing 1, and the light guide plate 4 and the display panel 5 are in the vertical direction. It is united by a panel case (not shown) that is slidably fitted. This panel case is suitably used, for example, by screwing or by fitting means for fitting fitting protrusions formed on the left and right side surfaces of the housing 1 to fitting recesses formed on the left and right side surfaces of the panel case. It is fixed to the housing 1 using the holding means. In a state where the panel case is fixed, a gap substantially equal to the vertical direction of the lighting unit 6 is formed between the upper surface of the housing 1 and the upper edge of the display panel 5.

なお、導光板４及び表示パネル５を筐体１に固定するには、必ずしもパネルケースを用いる必要はない。例えば、筐体１の横幅とほぼ等しい横幅を持つ導光板４と表示パネル５を、接着剤などで結合して、上記のような適宜の保持手段で保持するなどとしてもよい。   In order to fix the light guide plate 4 and the display panel 5 to the housing 1, it is not always necessary to use a panel case. For example, the light guide plate 4 and the display panel 5 having a width substantially equal to the width of the housing 1 may be combined with an adhesive or the like and held by the appropriate holding means as described above.

点灯部６はランプホルダ７を備え、ランプホルダ７の内部には、図１に示すように、導光ロッド８と、ＬＥＤ（発光ダイオード）９ａ及び９ｂと、光量センサ１０とが配設されている。   The lighting unit 6 includes a lamp holder 7. As shown in FIG. 1, a light guide rod 8, LEDs (light emitting diodes) 9 a and 9 b, and a light amount sensor 10 are disposed inside the lamp holder 7. Yes.

ランプホルダ７は、合成樹脂材料から下面が開口した直方体状に形成され、その横幅は筐体１の横幅とほぼ等しくなっている。   The lamp holder 7 is formed in a rectangular parallelepiped shape having a lower surface opened from a synthetic resin material, and the lateral width thereof is substantially equal to the lateral width of the housing 1.

導光ロッド８は透明アクリル樹脂製で、上面がＶ字状の反射面８ａである柱状であって、反射面８ａにはＶ溝加工やドット印刷などにより光を反射する反射構造が形成されている。そして、反射面８ａの一部又は全部を粗面化するなどして光が全反射しない部分を設けることで、ランプホルダ７の上面と導光ロッド８の反射面８ａの間に形成された空間６ａ内に、ＬＥＤ９ａ及び９ｂからの光の一定割合であって且つ少量の光を漏らす構成になっている。   The light guide rod 8 is made of a transparent acrylic resin and has a columnar shape whose upper surface is a V-shaped reflection surface 8a. The reflection surface 8a is formed with a reflection structure that reflects light by V-groove processing or dot printing. Yes. A space formed between the upper surface of the lamp holder 7 and the reflecting surface 8a of the light guide rod 8 is provided by providing a portion where the light is not totally reflected by roughening part or all of the reflecting surface 8a. In 6a, it is the structure which is a fixed ratio of the light from LED9a and 9b, and leaks a small amount of light.

ランプホルダ７内には、導光ロッド８の両底面８ｂに対向して、ＬＥＤ９ａとＬＥＤ９ｂとが配置される。ＬＥＤ９ａ及び９ｂは、図示しない基板上に導電性接着剤などで固着され、この基板は接着剤やねじなどの固定手段でランプホルダ７に固定される。このＬＥＤ９ａ及び９ｂは、電線Ｗ１及び前記図示しない基板を介して点灯装置４から電力を供給されて、発光する。   In the lamp holder 7, an LED 9 a and an LED 9 b are disposed so as to face both the bottom surfaces 8 b of the light guide rod 8. The LEDs 9a and 9b are fixed to a substrate (not shown) with a conductive adhesive or the like, and this substrate is fixed to the lamp holder 7 by fixing means such as an adhesive or a screw. The LEDs 9a and 9b emit light by being supplied with electric power from the lighting device 4 through the electric wire W1 and the substrate (not shown).

空間６ａ内のランプホルダ７の上面には、フォトダイオードなどの光量センサ１０が、１個配設されている。光量センサ１０は、導光ロッド８の反射面８ａからの漏れ光を検出することにより、ＬＥＤ９ａ及び９ｂの光量を検出する。   One light amount sensor 10 such as a photodiode is disposed on the upper surface of the lamp holder 7 in the space 6a. The light quantity sensor 10 detects the light quantity of the LEDs 9 a and 9 b by detecting leakage light from the reflection surface 8 a of the light guide rod 8.

点灯部６は、導光板４及び表示パネル５が筐体１に取り付けられた状態において、ランプホルダ７の左右両端から後方に突設された差込片（図示せず）を、筐体１上部に形成した差込孔部材（図示せず）に差し込んで、器具本体１に着脱自在に取り付けられる。このとき、点灯部６は筐体１と表示パネル５の隙間を塞ぎ、表示パネル５と点灯部６とで筐体１の前面開口を覆っている。またこのとき、導光ロッド８の下面８ｃが、導光板４の上端面の真上に位置している。   In the state where the light guide plate 4 and the display panel 5 are attached to the housing 1, the lighting unit 6 is configured to insert insertion pieces (not shown) protruding rearward from the left and right ends of the lamp holder 7 at the upper portion of the housing 1. It is inserted in the insertion hole member (not shown) formed in, and is detachably attached to the instrument body 1. At this time, the lighting unit 6 closes the gap between the housing 1 and the display panel 5, and the display panel 5 and the lighting unit 6 cover the front opening of the housing 1. At this time, the lower surface 8 c of the light guide rod 8 is located immediately above the upper end surface of the light guide plate 4.

筐体１は、合成樹脂などの絶縁性材料からなり、図示しない取付ねじによって壁面または天井面に取り付けられる。また筐体１内には、電線Ｗ２を介して商用電源ＡＣに接続された点灯装置２と、商用電源ＡＣの停電時に点灯装置２へ給電するための非常用電源であって、電線Ｗ３を介して点灯装置２に接続された二次電池３とが配設されている。   The housing 1 is made of an insulating material such as synthetic resin, and is attached to a wall surface or a ceiling surface by a mounting screw (not shown). Further, in the housing 1, there are a lighting device 2 connected to the commercial power source AC via the electric wire W2, and an emergency power source for supplying power to the lighting device 2 in the event of a power failure of the commercial power source AC. And a secondary battery 3 connected to the lighting device 2.

点灯装置２は、図３に示すように、充電回路部１１と、点灯回路部１２と、ＬＥＤ電流調整部１３とを備えている。充電回路部１１は、電線を介して商用電源ＡＣ並びに二次電池３に接続され、商用電源ＡＣから電力を供給されて二次電池３を充電する。点灯回路部１２は、商用電源ＡＣと二次電池３とに接続され、通常は商用電源ＡＣにより給電されて点灯部６を点灯させ、商用電源ＡＣの停電時には二次電池３により給電されて点灯部６を点灯させるように構成されている。ＬＥＤ電流調整部１３は、後述するＬＥＤ光量調整動作を行うとともに、ＬＥＤ光量調整動作を行っていないときには、このＬＥＤ光量調整動作によって設定されたＬＥＤ電流の設定値に基づいて、点灯回路部１２がＬＥＤ９ａ及び９ｂに流すＬＥＤ電流の電流値を制御している。   As shown in FIG. 3, the lighting device 2 includes a charging circuit unit 11, a lighting circuit unit 12, and an LED current adjusting unit 13. The charging circuit unit 11 is connected to the commercial power supply AC and the secondary battery 3 through electric wires, and is charged with the secondary battery 3 by being supplied with electric power from the commercial power supply AC. The lighting circuit unit 12 is connected to the commercial power source AC and the secondary battery 3 and is usually supplied with power from the commercial power source AC to light the lighting unit 6. It is comprised so that the part 6 may be lighted. The LED current adjusting unit 13 performs the LED light amount adjusting operation described later, and when the LED light amount adjusting operation is not performed, the lighting circuit unit 12 performs the LED current adjusting operation based on the set value of the LED current set by the LED light amount adjusting operation. The current value of the LED current passed through the LEDs 9a and 9b is controlled.

本実施形態において、ＬＥＤ９ａ及び９ｂから放射された光は、これらに対向した導光ロッド８の両底面８ｂから、導光ロッド８へ入射する。この光の一部は反射面８ａから空間６ａ内に放射され、残りの光は、図１の矢印に示すように導光ロッド８の反射面８ａによって下方へと反射され、導光ロッド８の下底面８ｃから線状に放射される。   In the present embodiment, the light emitted from the LEDs 9a and 9b is incident on the light guide rod 8 from both bottom surfaces 8b of the light guide rod 8 opposed to the LEDs 9a and 9b. Part of this light is radiated from the reflecting surface 8a into the space 6a, and the remaining light is reflected downward by the reflecting surface 8a of the light guide rod 8 as shown by the arrows in FIG. Radiated linearly from the lower bottom surface 8c.

導光ロッド８の下底面８ｃから導光板４へ向かって線状に放射された光は、図１に示すように、導光板４の上端面から導光板４の内部へ入射する。この光は導光板４の後面で反射され、導光板４の前面から表示パネル５方向へ向かって面状に放射される。なお、導光板４の後方に反射シートを配設し、導光板４の後方へ放射された光を前方へ反射するようにしてもよい。   The light emitted linearly from the lower bottom surface 8 c of the light guide rod 8 toward the light guide plate 4 enters the light guide plate 4 from the upper end surface of the light guide plate 4 as shown in FIG. 1. This light is reflected on the rear surface of the light guide plate 4 and is emitted in a planar shape from the front surface of the light guide plate 4 toward the display panel 5. Note that a reflection sheet may be provided behind the light guide plate 4 so that the light emitted to the rear of the light guide plate 4 is reflected forward.

次に、本発明の特徴であるＬＥＤ光量調整動作について説明する。   Next, the LED light amount adjustment operation, which is a feature of the present invention, will be described.

発明が解決しようとする課題で示したように、ＬＥＤは、素子毎に光量のバラツキがある。また、一般にＬＥＤは、ＬＥＤ電流が一定であれば、図４に示すように総点灯時間が経過すると光量が低下していく。これに対し本実施形態では、施工時、並びに、毎日の決まった時間や照明装置の点検時などに定期的に、以下に示すＬＥＤ光量調整動作を行うことによって、ＬＥＤ９ａ及び９ｂがそれぞれ所定の光量となるように、各ＬＥＤ９ａ，９ｂのＬＥＤ電流を調整している。   As shown in the problem to be solved by the invention, the LED has a variation in light amount for each element. In general, if the LED current is constant, the amount of light decreases as the total lighting time elapses as shown in FIG. On the other hand, in the present embodiment, the LED 9a and 9b each have a predetermined light amount by performing the following LED light amount adjusting operation at the time of construction, and at a fixed time every day or when checking the lighting device. The LED current of each LED 9a, 9b is adjusted so that

以下に、このＬＥＤ光量調整動作の手順を説明する。   The procedure of this LED light quantity adjustment operation will be described below.

まず、ＬＥＤ電流調整部１３は、第１の発光パターンとして、ＬＥＤ９ａだけを点灯させＬＥＤ９ｂを消灯させるような発光パターンで各ＬＥＤ９ａ，９ｂを制御する。そしてＬＥＤ電流調整部１３は、図示しない電線に挿入された図示しないスイッチをオン制御して、光量センサ１０に電力を供給する。このとき光量センサ１０は、この状態での漏れ光の光量を検出するとともに、検出した光量の値をＬＥＤ電流調整部１３に送信する。ここで、ＬＥＤ電流調整部１３には、予め、ＬＥＤ９ａだけを点灯させたときに光量センサ１０で検出される光量の目標値が設定されており、ＬＥＤ電流調整部１３は、この目標値と検出された光量の値とを比較して、検出される光量が目標値と等しくなるようにＬＥＤ９ａに流すＬＥＤ電流を調整する。ここで、ＬＥＤ電流を調整する際には、例えば、オンデューティ比を変化させることで単位時間あたりの平均電流を増減させることによって、ＬＥＤ電流の電流値を調整する。そしてＬＥＤ電流調整部１３は、光量センサ１０で検出される光量が上記目標値と等しくなったときのＬＥＤ電流の値を、ＬＥＤ９ａの設定電流値として設定し、その後、電線に挿入された上記スイッチをオフ制御して、光量センサ１０への電力の供給を停止する。   First, the LED current adjusting unit 13 controls each LED 9a, 9b with a light emission pattern that turns on only the LED 9a and turns off the LED 9b as the first light emission pattern. The LED current adjustment unit 13 supplies power to the light amount sensor 10 by turning on a switch (not shown) inserted in a wire (not shown). At this time, the light quantity sensor 10 detects the light quantity of the leaked light in this state, and transmits the detected light quantity value to the LED current adjustment unit 13. Here, a target value of the light amount detected by the light amount sensor 10 when only the LED 9a is turned on is set in advance in the LED current adjusting unit 13, and the LED current adjusting unit 13 detects the target value and the detected value. The amount of light emitted is compared, and the LED current passed through the LED 9a is adjusted so that the detected amount of light is equal to the target value. Here, when adjusting the LED current, for example, the current value of the LED current is adjusted by increasing or decreasing the average current per unit time by changing the on-duty ratio. The LED current adjusting unit 13 sets the LED current value when the light amount detected by the light amount sensor 10 becomes equal to the target value as the set current value of the LED 9a, and then the switch inserted into the electric wire. Is turned off, and the supply of power to the light quantity sensor 10 is stopped.

次にＬＥＤ電流調整部１３は、第２の発光パターンとして、ＬＥＤ９ａを消灯させＬＥＤ９ｂだけを点灯させるような発光パターンで各ＬＥＤ９ａ，９ｂを制御し、第１の発光パターンと同様の動作を行って、ＬＥＤ９ｂの設定電流値を設定する。ここで、ＬＥＤ９ａの光量の目標値とＬＥＤ９ｂの光量の目標値とを同じ値に設定しておけば、ＬＥＤ９ａの光量とＬＥＤ９ｂの光量が等しくなるので、表示パネル５のうちでＬＥＤ９ａで照明される部位の輝度と、ＬＥＤ９ｂで照明される部位の輝度が等しくなり、表示パネル５での色ムラをなくすことができる。なお、これらの発光パターンを切り替えるとき（ＬＥＤ９ａ，９ｂを両方点灯させた発光パターンから、第１または第２の発光パターンに切り替えるときなども含む）には、人が知覚できない程度の早い（例えば数１００Ｈｚ以上の）周期で、各発光パターンを切り替えている。   Next, the LED current adjustment unit 13 controls each LED 9a, 9b with a light emission pattern that turns off the LED 9a and turns on only the LED 9b as the second light emission pattern, and performs the same operation as the first light emission pattern. The set current value of the LED 9b is set. Here, if the target value of the light quantity of the LED 9a and the target value of the light quantity of the LED 9b are set to the same value, the light quantity of the LED 9a and the light quantity of the LED 9b become equal. The luminance of the part is equal to the luminance of the part illuminated by the LED 9b, and color unevenness on the display panel 5 can be eliminated. It should be noted that when these light emission patterns are switched (including when the light emission pattern in which both the LEDs 9a and 9b are lit are switched to the first or second light emission pattern, etc.), it is as fast as humans cannot perceive (for example, several Each light emission pattern is switched at a period of 100 Hz or more.

そしてＬＥＤ電流調整部１３は、上記のような調整動作を行っていないときには、第１の発光パターン及び第２の発光パターンで設定された各ＬＥＤ９ａ，９ｂの設定電流値に基づいて、ＬＥＤ９ａ及び９ｂを点灯させるのである。   Then, the LED current adjustment unit 13 does not perform the adjustment operation as described above, and the LEDs 9a and 9b are based on the set current values of the LEDs 9a and 9b set by the first light emission pattern and the second light emission pattern. Is turned on.

本実施形態は、上記のようなＬＥＤ光量調整動作を行うことで、一つの光量センサ１０だけを用いて、ＬＥＤ９ａとＬＥＤ９ｂの２つのＬＥＤの光量を所望の値に設定することができる。   In the present embodiment, by performing the LED light amount adjustment operation as described above, the light amounts of the two LEDs 9a and 9b can be set to desired values using only one light amount sensor 10.

ここで、予め設定しておく光量の目標値としては、ＬＥＤ９ａとＬＥＤ９ｂの両方を点灯させたときに、表示パネル５の輝度が所望の目標範囲内に収まる値にしておけばよい。すなわち、このＬＥＤ光量調整動作は、商用電源ＡＣにより給電される通常時と二次電池３により給電される非常時とに対してそれぞれ行われ、例えばＢ級ＢＨ形の避難口誘導灯であれば、ＪＩＬ５５０２で定められているように、表示パネル５の平均輝度が、商用電源ＡＣから電力を供給される通常時では５００〜８００ｃｄ／ｍ２の範囲の値となるように、二次電池３から電力を供給される停電時などの非常時には１００〜３００ｃｄ／ｍ２の範囲の値となるように、各ＬＥＤ９ａ，９ｂの電流値が調整される。 Here, the light intensity target value set in advance may be set to a value that allows the luminance of the display panel 5 to fall within a desired target range when both the LED 9a and the LED 9b are turned on. That is, this LED light quantity adjustment operation is performed for each of the normal time supplied by the commercial power supply AC and the emergency supplied by the secondary battery 3, for example, if it is a class B BH type escape exit light As defined in JIL5502, from the secondary battery 3 so that the average brightness of the display panel 5 has a value in the range of 500 to 800 cd / m 2 in normal time when power is supplied from the commercial power source AC. The current values of the LEDs 9a and 9b are adjusted so as to be in the range of 100 to 300 cd / m 2 in the event of an emergency such as a power failure where power is supplied.

以上述べた本実施形態では、施工時にＬＥＤ光量調整動作を行うことで、複数のＬＥＤ素子の光量にばらつきがあっても一定の光出力を得ることができ、また、定期的にＬＥＤ光量調整動作を行うことで、各ＬＥＤの経年劣化の程度が異なっても、一定の光出力を得ることができる。また本実施形態では、ＬＥＤ光量調整動作を行う際にだけ光量センサ１０に電力を供給しているので、無駄な電力消費をなくすことができ、省エネを実現できる。また、ＬＥＤ光量調整動作を行う際に、人が知覚できない程度の早い周期で発光パターンを切り替えているので、外観上の見栄えが悪くなるのを防ぐことができる。   In the present embodiment described above, by performing the LED light amount adjustment operation at the time of construction, a constant light output can be obtained even if the light amounts of the plurality of LED elements vary, and the LED light amount adjustment operation is periodically performed. By performing the above, a constant light output can be obtained even if the degree of aging of each LED is different. In the present embodiment, since power is supplied to the light quantity sensor 10 only when the LED light quantity adjustment operation is performed, useless power consumption can be eliminated and energy saving can be realized. In addition, when performing the LED light amount adjustment operation, since the light emission pattern is switched at a cycle that is not perceptible to humans, it is possible to prevent the appearance from deteriorating.

なお、本実施形態のように２個のＬＥＤ９ａ，９ｂの電流値を設定するときには、任意の２種類の発光パターンで各ＬＥＤ９ａ，９ｂを点灯させて、各ＬＥＤ９ａ，９ｂの電流値を設定すればよい。すなわち、例えば第１の発光パターンとしてＬＥＤ９ａだけ点灯させて、このとき検出される光量から、ＬＥＤ９ａの電流値を設定し、次に、第２の発光パターンとして２個のＬＥＤ９ａ及び９ｂを両方点灯させて、このとき検出される光量から、ＬＥＤ９ｂの電流値を設定するなどとしてもよい。   Note that when setting the current values of the two LEDs 9a and 9b as in the present embodiment, the LEDs 9a and 9b can be lit with arbitrary two types of light emission patterns, and the current values of the LEDs 9a and 9b can be set. Good. That is, for example, only the LED 9a is turned on as the first light emission pattern, the current value of the LED 9a is set from the amount of light detected at this time, and then both the two LEDs 9a and 9b are turned on as the second light emission pattern. Thus, the current value of the LED 9b may be set based on the amount of light detected at this time.

また、ＬＥＤの個数は２個に限られず、３個以上のＬＥＤを用いてもよく、この場合には、ＬＥＤの個数と同じ回数の発光パターンでＬＥＤ光量調整動作を行うことで、各ＬＥＤの電流値を設定することができる。また、本実施形態では１個の光量センサで２個のＬＥＤの各光量を設定しているが、ＬＥＤを３個以上設けた場合には光量センサが１個である必要はなく、例えば４個のＬＥＤに対して光量センサを２個設け、各光量センサで２個ずつのＬＥＤの電流値を設定するなどとしてもよい。   In addition, the number of LEDs is not limited to two, and three or more LEDs may be used. In this case, by performing the LED light amount adjustment operation with the same number of light emission patterns as the number of LEDs, The current value can be set. In this embodiment, each light quantity of two LEDs is set by one light quantity sensor. However, when three or more LEDs are provided, the number of light quantity sensors does not need to be one, for example, four pieces. Two light quantity sensors may be provided for each LED, and the current value of each of the two LEDs may be set by each light quantity sensor.

なお、本実施形態の別の形態として、図５に示すように、導光ロッド８の片側の底面８ｄに対向するように、複数のＬＥＤ９ｄを配置してもよい。この場合には、導光ロッド８の形状は、図に示すように楔形となっている。   As another form of this embodiment, as shown in FIG. 5, a plurality of LEDs 9 d may be arranged so as to face the bottom surface 8 d on one side of the light guide rod 8. In this case, the shape of the light guide rod 8 is a wedge shape as shown in the figure.

２ 点灯装置
４ 導光板
５ 表示パネル
６ 点灯部
８ 導光ロッド
９ａ ＬＥＤ
９ｂ ＬＥＤ
１０ 光量センサ 2 lighting device 4 light guide plate 5 display panel 6 lighting part 8 light guide rod 9a LED
9b LED
10 Light intensity sensor

Claims (7)

複数の発光ダイオード及び、底面でこれら発光ダイオードと対向するとともにこれら発光ダイオードから入射された光を線状の光に変換して側面から出射する導光ロッドを有する点灯部と、側端面で前記導光ロッドの側面と光学的に結合されて、この導光ロッドから入射された線状の光を面状の光に変換して出射する導光板と、この導光板から放射された光によって照明される表示パネルと、外部電源に接続されて前記各発光ダイオードを点灯させる点灯装置と、この点灯装置を内部に収容し、前記点灯部及び前記導光板を保持する筐体とを備え、
前記点灯部には、前記導光ロッドからの漏れ光を検出することによって、前記複数の発光ダイオードから放射される光の光量を検出する光量センサが備えられており、
前記点灯装置は、ＬＥＤ光量調整動作として、前記複数の発光ダイオードのうち少なくとも一つは点灯させて残りは消灯させるような発光パターンで前記各発光ダイオードを点灯させ、このときの前記漏れ光の光量を前記光量センサを介して検出し、この検出された光量が当該発光パターンに対応した所定の目標範囲内に収まるように前記各発光ダイオードの光量を調整する動作を行い、
この点灯装置は、前記ＬＥＤ光量調整動作で調整された前記各発光ダイオードの光量に基づいて、前記各発光ダイオードを点灯させることを特徴とする照明装置。 A plurality of light emitting diodes, a lighting part having a light guide rod facing the light emitting diodes on the bottom surface and converting light incident from the light emitting diodes into linear light and exiting from the side surfaces, and the light guides on the side end surfaces. A light guide plate that is optically coupled to the side surface of the light rod, converts linear light incident from the light guide rod into planar light, and is emitted by the light emitted from the light guide plate. A display panel, a lighting device connected to an external power source to turn on the light emitting diodes, a housing that houses the lighting device and holds the lighting unit and the light guide plate,
The lighting unit is provided with a light amount sensor that detects the amount of light emitted from the plurality of light emitting diodes by detecting leakage light from the light guide rod,
As the LED light amount adjustment operation, the lighting device turns on each light emitting diode with a light emitting pattern in which at least one of the plurality of light emitting diodes is turned on and the rest is turned off, and the light amount of the leakage light at this time Is detected via the light amount sensor, and the light amount of each light emitting diode is adjusted so that the detected light amount falls within a predetermined target range corresponding to the light emission pattern,
The lighting device lights up each light emitting diode based on the light amount of each light emitting diode adjusted by the LED light amount adjusting operation. 前記点灯装置は、初期電源投入時に前記ＬＥＤ光量調整動作を行うことを特徴とする請求項１記載の照明装置。   The lighting device according to claim 1, wherein the lighting device performs the LED light amount adjustment operation when an initial power supply is turned on. 前記点灯装置は、定期的に前記ＬＥＤ光量調整動作を行うことを特徴とする請求項１記載の照明装置。   The lighting device according to claim 1, wherein the lighting device periodically performs the LED light amount adjustment operation. 前記光量センサは、前記ＬＥＤ光量調整動作を行う際にだけ、給電が入切されることを特徴とする請求項１〜３のいずれか一項記載の照明装置。   The illumination device according to any one of claims 1 to 3, wherein the light quantity sensor is turned on and off only when the LED light quantity adjustment operation is performed. 前記点灯装置は、前記ＬＥＤ光量調整動作を行う際には、人間の目が明るさのちらつきを感知できない程度の早い周期で、前記発光パターンを切り替えることを特徴とする請求項１〜４のいずれか一項記載の照明装置。   5. The lighting device according to claim 1, wherein when the LED light amount adjustment operation is performed, the lighting pattern is switched at an early cycle such that a human eye cannot perceive brightness flicker. The lighting device according to claim 1. 前記筐体の内部には二次電池が備えられており、
前記点灯装置は、前記外部電源からの電力供給により前記二次電池を充電する充電回路部と、前記外部電源又は前記二次電池からの電力供給により前記発光ダイオードを点灯させる点灯回路部とを備え、
前記点灯装置は、前記ＬＥＤ光量調整動作を行う際には、前記外部電源からの電力供給で前記発光ダイオードを点灯させる場合と、前記二次電池からの電力供給でこれら発光ダイオードを点灯させる場合とで、前記光量センサで検出される光量の目標範囲が同じ発光パターンに対して異なる値となるように、前記各発光ダイオードの光量を調整することを特徴とする請求項１〜５のいずれか一項記載の照明装置。 A secondary battery is provided inside the housing,
The lighting device includes a charging circuit unit that charges the secondary battery by power supply from the external power source, and a lighting circuit unit that lights the light emitting diode by power supply from the external power source or the secondary battery. ,
When the LED light amount adjustment operation is performed, the lighting device turns on the light emitting diodes by supplying power from the external power source, and turns on the light emitting diodes by supplying power from the secondary battery. Then, the light quantity of each said light emitting diode is adjusted so that the target range of the light quantity detected by the said light quantity sensor may become a different value with respect to the same light emission pattern. The lighting device according to item. 前記点灯装置は、前記複数の発光ダイオードに流すＬＥＤ電流を調整するＬＥＤ電流調整部を備え、
前記点灯装置は、前記ＬＥＤ光量調整動作を行う際には、前記ＬＥＤ電流調整部で前記ＬＥＤ電流を調整することによって、前記各発光ダイオードの光量を調整することを特徴とする請求項１〜６のいずれか一項記載の照明装置。 The lighting device includes an LED current adjusting unit that adjusts an LED current flowing through the plurality of light emitting diodes,
The said lighting device adjusts the light quantity of each said light emitting diode by adjusting the said LED electric current in the said LED electric current adjustment part, when performing the said LED light quantity adjustment operation | movement. The lighting device according to any one of the above.
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