JP4698713B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device capable of dimming control according to the light output of its own lamp.

  The following Patent Document 1 discloses a fluorescent lamp, an illuminance sensor that detects illuminance reflecting the light output of the fluorescent lamp, and the illuminance sensor as a lighting device capable of dimming control according to the light output of the lamp itself. An illumination device having a dimming control unit for dimming control of the fluorescent lamp based on a detection signal from is disclosed. In this illuminating device, the dimming amount is feedback-controlled so as to keep the illuminance detected by the illuminance sensor constant.

According to this illuminating device, the light output of the lamp can be kept constant even if the light output of the lamp tends to decrease due to changes over time or the like. Therefore, it is not necessary to set the initial illuminance higher than the appropriate illuminance in anticipation of a decrease in the light output of the lamp due to a change over time, and the appropriate illuminance can be obtained from the initial state. For this reason, useless power consumption can be suppressed and power saving can be achieved.
FIG. 15 of Japanese Patent Laid-Open No. 2000-315589

  In Patent Document 1, there is no mention of the arrangement of the lamp, the light control unit, and the illuminance sensor. In the conventional lighting device, a fluorescent lamp is used as a lamp, and it is assumed that a lamp with a small calorific value is used. Therefore, it is not necessary to pay special attention to their arrangement.

  However, for example, in a lighting device used for tunnel entrance illumination, a high-power (and therefore a large amount of heat generated) lamp such as a high-pressure sodium lamp is used as a lamp. Therefore, when the technique disclosed in Patent Document 1 is applied to such a lighting device, the heat generation becomes a big problem, and the light control section and the illuminance sensor are broken by the heat generation, and the reliability of the device is increased. The nature will decline. On the other hand, a lighting device using such a high-power lamp has a great power saving effect as described above.

  The present invention has been made in view of such circumstances, and is an illuminating device capable of dimming control in accordance with the light output of its own lamp. It aims at providing the illuminating device which can suppress a reliability fall.

  The following aspects are presented as means for solving the problems. A lighting device according to a first aspect includes a housing, a lamp housed in the housing, an illuminance sensor that is housed in the housing and detects illuminance reflecting the light output of the lamp, and is housed in the housing. A dimming control unit for dimming control of the lamp based on a detection signal from the illuminance sensor, a heat shield plate interposed between the lamp and the dimming control unit, and housed in the housing And a light guide unit that guides light from the lamp to the illuminance sensor, and the illuminance sensor is disposed on the dimming control unit side with respect to the heat shield plate.

  According to the first aspect, the light control amount of the lamp can be feedback-controlled so that the illuminance detected by the illuminance sensor is kept constant. Therefore, even if the light output of the lamp tends to decrease due to changes over time, the light output of the lamp can be kept constant. Therefore, it is not necessary to set the initial illuminance higher than the appropriate illuminance in anticipation of a decrease in the light output of the lamp due to a change over time, and the appropriate illuminance can be obtained from the initial state. For this reason, useless power consumption can be suppressed and power saving can be achieved.

  And according to the said 1st aspect, since the heat shielding board is interposed between the lamp | ramp and the light modulation control part, the heat | fever by a lamp | ramp is heat-shielded with respect to the light modulation control part. For this reason, even if it uses a lamp | ramp with a large emitted-heat amount, the reliability fall of the light control part by the heat_generation | fever can be suppressed. According to the first aspect, since the illuminance sensor is disposed on the light control section side with respect to the heat shield plate, the heat from the lamp is shielded from the illuminance sensor. For this reason, even if it uses a lamp | ramp with a large emitted-heat amount, the reliability fall of the illumination intensity sensor by the heat_generation | fever can be suppressed. If the illuminance sensor is focused only on the point of illuminance detection, the illuminance sensor is usually arranged close to the lamp. On the other hand, an illuminance sensor is disposed on the dimming control unit side, and the light from the lamp is guided to the distant place by the light guide unit, thereby obtaining a heat shielding effect on the illuminance sensor and reducing the reliability of the illuminance sensor. It is suppressed.

  In the lighting device according to a second aspect, in the first aspect, a lighting window is formed in the heat shield plate, and the light guide unit guides light from the lamp to the illuminance sensor through the lighting window. It is. The daylighting window may be a simple hole or may be formed of a transparent member such as a glass member.

  Although this 2nd aspect gives the example using the lighting window formed in the heat shield, it is not limited to this example in the said 1st aspect.

  The lighting device according to a third aspect includes a reflection plate that reflects light from the lamp forward in the first or second aspect, a lighting window is formed in the reflection plate, and the light guide unit includes: It includes a reflecting mirror that is disposed on the lamp side with respect to the heat shield plate and reflects light that has passed through the daylighting window of the reflecting plate out of light from the lamp.

  The third mode is an example of the light guide unit, but the first and second modes are not limited to this example. For example, an optical fiber or the like may be used as the light guide unit.

  In the lighting device according to a fourth aspect, in any of the first to third aspects, the lamp is a high-pressure sodium lamp or a metal halide lamp.

  The fourth aspect is an example of a lamp, but the first to third aspects are not limited to this example. For example, an LED lamp or the like may be used as the lamp.

  The illumination device according to the fifth aspect is used for tunnel entrance illumination in any of the first to fourth aspects.

  The fifth aspect is an example of the application of the lighting device according to the first to fourth aspects, but the application is not limited to this example.

  According to the present invention, it is an illumination device capable of dimming control according to the light output of its own lamp, and even if a lamp with a large calorific value is used, it is possible to suppress a decrease in reliability due to the heat generation. An apparatus can be provided.

  Hereinafter, a lighting device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic plan view seen from the front (illumination light exit side) showing a tunnel entrance illumination device 1 used for tunnel entrance illumination as an illumination device according to an embodiment of the present invention. FIG. 2 is a side view taken along the arrow A in FIG. FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a cross-sectional view taken along the line CC in FIG. FIG. 5 is a schematic diagram showing a state of the light L from the lamp 3 to the illuminance sensor 4 by extracting a part of FIG. In FIG. 5, illustration of a heat shield plate 6 and a reflector plate 16 which will be described later is omitted.

  A tunnel entrance lighting device 1 according to the present embodiment includes a box-shaped housing 2 flattened in the front-rear direction (a direction perpendicular to the paper surface in FIG. 1), a lamp 3 housed in the housing 2, and a housing An illuminance sensor 4 that detects the illuminance reflected in the light output of the lamp 3 housed in the lamp 2, and a dimming control unit 5 that controls the light of the lamp 3 based on a detection signal from the illuminance sensor 4 housed in the housing; And a heat shield plate 6 interposed between the lamp 3 and the dimming control unit 5, and a light guide unit 7 which is housed in the housing 2 and guides the light L from the lamp 3 to the illuminance sensor 4. Yes.

  The housing 2 is composed of a box-shaped main body 11 made of a stainless steel plate or the like and having a large opening in the front, and a transparent cover 12 made of a glass plate or the like that covers the front of the main body 11. One side of the transparent cover 12 is hinged to the main body 11 by a metal fitting 13, and the transparent cover 12 can be freely opened and closed so that the lamp 3 and the like can be easily replaced. On the other side of the transparent cover 12, a fastener 14 is provided for detachably fixing the transparent cover 12 to the main body 11. Although not shown in the drawings, a packing is provided between the transparent cover 12 and the main body 11 so that the space in the housing 2 can be kept watertight with respect to the outside. An attachment leg 15 for attaching to the wall surface of the tunnel is fixed to the back surface of the main body 11.

  In the present embodiment, the heat shield plate 6 is made of a metal plate such as a stainless steel plate, and substantially divides the internal space of the housing 2 into two of the left chamber and the right chamber in FIGS. 1 and 3. . Although not shown in the drawing, the heat shield plate 6 is fixed to the bottom surface of the main body 11 by an L metal fitting or the like. A lamp 3 is disposed in the left chamber, and a dimming control unit 5 (an electronic ballast 23 and a control unit 24 described later) and an illuminance sensor 4 are disposed in the right chamber. Thereby, the heat shield 6 is interposed between the lamp 3, the dimming controller 5 and the illuminance sensor 4. In the present embodiment, the heat shield plate 6 is constituted by a flat plate, but may be constituted by a double plate, a corrugated plate or the like.

  In the present embodiment, a high pressure sodium lamp is used as the lamp 3. However, in the present invention, as the lamp 3, for example, a metal halide lamp or an LED lamp may be used. The left chamber is provided with a substantially semi-cylindrical reflecting plate 16 that reflects light emitted backward and laterally from the lamp 3 forward to produce illumination light. The reflection plate 16 is fixed to the main body 11 via an attachment member (not shown). The lamp 3 is held by a socket 17 and a lamp holding bracket 18 that are respectively fixed to the reflecting plate 16. The lamp 3 has a built-in arc tube 3a.

  A circular daylighting window 16b (see FIG. 1) is formed at a position immediately below the arc tube 3a in the reflecting plate 16. In the present embodiment, the daylighting window 16b is a hole in the present embodiment, but it may be formed of a transparent member such as a glass member. Directly below the daylighting window 16b, the light that is emitted from the lamp 3 and passes through the daylighting window 16b is reflected as illuminance detection light toward the daylighting window 6a (see FIG. 4) formed on the heat shield plate 6. A mirror 21 is provided. In the present embodiment, the daylighting window 6a is a hole, but it may be formed of a transparent member such as a glass member. A reflecting member 22 having a U-shaped cross section is provided on the back surface of the reflecting plate 16, a reflecting mirror 21 is provided at one end of the reflecting member 22, and the other end of the reflecting member 22 is near the lighting window 6 a of the heat shield plate 6. Has been placed. A reflection rectangular tube is formed by the inner surface of the reflection member 22 and the back surface of the reflection plate 16, and the illuminance detection light reflected by the reflection mirror 21 is directed toward the lighting window 6 a of the heat shield plate 6 efficiently. The illuminance sensor 4 is disposed near the daylighting window 6a of the heat shield 6 in the right side chamber, receives illuminance detection light through the daylighting window 6a, and detects the illuminance reflecting the light output of the lamp 3.

  As can be seen from the above description, in the present embodiment, the light guide 7 that guides the light L from the lamp 3 to the illuminance sensor 4 is constituted by the reflecting mirror 21 and the reflecting member 22. But the light guide part 7 is not necessarily limited to such a structure. For example, the reflecting member 22 is preferably provided in order to efficiently guide the light L from the lamp 3 to the illuminance sensor 4, but it is not necessarily provided. Moreover, you may comprise the light guide part 7 using an optical fiber.

  In the present embodiment, the dimming control unit 5 includes an electronic ballast 23 including an inverter that drives the lamp 3, and a control unit 24 that controls the electronic ballast 23. The control unit 24 receives a light output command signal indicating the target value of the light output of the lamp 3 from the outside, and the illuminance detected by the illuminance sensor 4 (that is, the light output of the lamp 3) is the target indicated by the light output command signal. The electronic ballast 23 is controlled so as to perform feedback control based on the detection signal from the illuminance sensor 4 so that the illuminance is in accordance with the value. The electrical schematic configuration of the tunnel entrance lighting device 1 according to the present embodiment is as shown in FIG.

  The electronic ballast 23 and the control unit 24 are fixed to the bottom surface of the main body 11 via the mounting base 25. In addition, electrical wiring between each part is performed via the terminal block 26.

  According to the present embodiment, the dimming control unit 5 keeps the illuminance detected by the illuminance sensor 4 constant (here, the value corresponding to the target value indicated by the light output command signal). The dimming amount can be feedback controlled. Therefore, even if the light output of the lamp tends to decrease due to changes over time, the light output of the lamp can be kept constant. Therefore, it is not necessary to set the initial illuminance higher than the appropriate illuminance in anticipation of a decrease in the light output of the lamp due to a change over time, and the appropriate illuminance can be obtained from the initial state. For this reason, useless power consumption can be suppressed and power saving can be achieved.

  And according to this Embodiment, since the heat-shielding board 6 is interposed between the lamp | ramp 3 and the light control part 5, the heat | fever by the lamp 3 is heat-shielded with respect to the light control part 5. FIG. . For this reason, even if it uses the lamp | ramp 3 with large emitted-heat amount, the reliability fall of the light control part 5 by the emitted_heat | fever can be suppressed. Moreover, according to this Embodiment, since the illumination intensity sensor 4 is arrange | positioned with respect to the heat insulation board 6 at the light control part 5 side, the heat | fever by the lamp | ramp 3 is insulated with respect to the illumination intensity sensor 4. FIG. For this reason, even if it uses the lamp | ramp 3 with large calorific value, the reliability fall of the illumination intensity sensor 4 by the heat_generation | fever can be suppressed. The illuminance sensor 4 is usually arranged close to the lamp 3 if attention is paid only to the point of illuminance detection. However, in the present embodiment, the heat shield is a place away from the lamp 3. By arranging the illuminance sensor 4 on the light control section 5 side with respect to the plate 6 and guiding the light of the lamp 3 to the distant place by the light guide section 7, the heat shielding effect on the illuminance sensor 4 is obtained, The reliability deterioration of the illuminance sensor 4 is suppressed.

  FIG. 6 is a schematic block diagram showing an example of a tunnel entrance illumination system using a plurality of tunnel entrance illumination apparatuses 1 according to the present embodiment. This tunnel entrance illumination system includes an external illuminance sensor 31 that detects the illuminance outside the tunnel, and a general control unit 32 in addition to the plurality of tunnel entrance illumination devices 1. The plurality of tunnel entrance lighting devices 1 are arranged in the tunnel at predetermined intervals over a predetermined distance from the tunnel entrance. Based on the detection signal from the external illuminance sensor 31, the overall control unit 32 sends the light output command signal to each tunnel entrance illumination device so that the illuminance by the tunnel entrance illumination is appropriate according to the illuminance outside the tunnel. 1 is supplied. The light output command signal may be created so as to indicate a stepwise target value of two or more steps according to the illuminance outside the tunnel, or a continuous target value according to the illuminance outside the tunnel. You may create as follows.

  According to this tunnel entrance illumination system, since the tunnel entrance illumination device 1 according to the present embodiment is used, reliability can be improved while saving power.

  The tunnel entrance illumination device and the tunnel entrance illumination system using the same according to one embodiment of the present invention have been described above, but the present invention is not limited to this embodiment. For example, the lighting device according to the present invention can be applied not only to a tunnel entrance lighting device but also to other various lighting devices.

It is the schematic plan view seen from the front which shows the tunnel entrance illuminating device by one embodiment of this invention. FIG. 2 is a side view taken along the arrow A in FIG. FIG. 3 is a cross-sectional view taken along the line BB in FIG. It is CC sectional view taken on the line in FIG. It is the schematic which shows the mode of the light which extracts a part in FIG. 3 and reaches an illumination intensity sensor from a lamp | ramp. FIG. 6 is a schematic block diagram showing an example of a tunnel entrance illumination system using a plurality of tunnel entrance illumination devices shown in FIGS. 1 to 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel entrance illumination device 2 Case 3 Lamp 4 Illuminance sensor 5 Dimming control part 6 Heat shield board 7 Light guide part

Claims (5)

A housing,
A lamp housed in the housing;
An illuminance sensor that detects the illuminance reflecting the light output of the lamp housed in the housing;
A dimming control unit for dimming and controlling the lamp based on a detection signal from the illuminance sensor housed in the housing;
A heat shield interposed between the lamp and the dimming controller;
A light guide that is housed in the housing and guides light from the lamp to the illuminance sensor;
With
The light from the lamp is radiated forward from the housing,
The dimming control unit is disposed on the side of the lamp with respect to the front-rear direction of the housing,
The illumination device, wherein the illuminance sensor is disposed on the light control section side with respect to the heat shield plate.   The lighting device according to claim 1, wherein a daylighting window is formed on the heat shield plate, and the light guide unit guides light from the lamp to the illuminance sensor through the daylighting window. Including a reflector that reflects light from the lamp forward;
A daylighting window is formed on the reflector;
The light guide unit includes a reflecting mirror that is disposed on the lamp side with respect to the heat shield plate and reflects light that has passed through the lighting window of the reflection plate out of light from the lamp. The lighting device according to claim 1.   The lighting device according to claim 1, wherein the lamp is a high-pressure sodium lamp or a metal halide lamp.   The illumination device according to claim 1, wherein the illumination device is used for tunnel entrance illumination.

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