JP2012028189A - Luminaire - Google Patents

Abstract

An object of the present invention is to provide a psychological sense of security while ensuring visibility and not disturb the landscape.
When a day starts to tilt, a control unit 7 gives a psychological sense of security and prevents a landscape from being disturbed by rated lighting a second light source 2 having a low color temperature. In addition, until the sun is completely set (time t1 to t2), the control unit 7 increases visibility by gradually increasing the light amount of the first light source 1 having a relatively high color temperature. Then, after the sun has completely set, the control unit 7 turns on the first and second light sources 1 and 2 at rated power so as to provide a psychological sense of security while ensuring visibility.
[Selection] Figure 1

Description

  The present invention relates to a lighting device, and more particularly to a lighting device suitable for use in outdoor lighting such as street lighting.

  Lighting devices used for road and street lighting (hereinafter collectively referred to as street lighting) need to ensure the visibility of passers-by and road vehicles on the road and street. By the way, the human visual sensitivity is different between photopic vision, scotopic vision, and dimming vision. In photopic vision, color can be perceived by the action of cone cells, and in dark vision, the cone cells do not function and cannot perceive color. However, the sensitivity is improved by the action of rod cells. In addition, twilight vision is an intermediate state between photopic vision and scotopic vision, and both cone cells and rod cells function. Here, the peak wavelength of visibility in photopic vision is about 555 nm, whereas the peak wavelength of visibility in dark vision is shifted to about 507 nm. Such a phenomenon is well known as the Purkinje phenomenon.

  As a lighting device using the Purkinje phenomenon, there is a vehicle headlamp device described in Patent Document 1. This conventional device emits light with a large blue component (short wavelength component) at night when the ambient illumination detected by the illumination sensor is relatively low, and a red component (long wavelength at daytime when the ambient illumination is relatively high. Visibility is enhanced by irradiating light with many components.

JP 2007-106341 A

  On the other hand, a lighting device used for street lighting, unlike a vehicle headlamp device, affects the landscape of the installation location. For example, pale illumination light that contains a relatively large amount of short-wavelength components often makes people feel uneasy, and is often not preferred as a landscape.

  This invention is made | formed in view of the said subject, and it aims at not giving up a landscape while giving a psychological relief while ensuring visibility.

  An illuminating device of the present invention is an illuminating device installed outdoors, an illuminance sensor unit that detects ambient illuminance of the outdoor, a first light source that irradiates light with a relatively high color temperature, and the first A second light source that emits light having a color temperature lower than the light emitted from one light source, and a control unit that controls blinking and light amount of the first and second light sources, When the ambient illuminance detected by the illuminance sensor unit is greater than or equal to a predetermined threshold value, the first and second light sources are turned off, and when the ambient illuminance falls below the threshold value, the second light source is turned off. The first light source is lit at a later time than the second light source while being rated lit.

  In this illumination device, it is preferable that the control unit increases the light amount of the first light source as ambient illuminance detected by the illuminance sensor unit decreases.

  The lighting device includes a clock unit that counts the current time, and the control unit reduces the light amount of the second light source to a predetermined lower limit value when the current time counted by the clock unit passes midnight. It is preferable to decrease.

  The lighting device of the present invention has an effect of providing a psychological sense of security while ensuring visibility and not hindering the landscape.

It is a block diagram which shows embodiment of the illuminating device which concerns on this invention. It is an external view same as the above. It is a top view of the lamp body in the same as the above. It is a time chart for demonstrating control operation | movement of the control part in the same as the above. It is a time chart for demonstrating control operation | movement of the control part in the same as the above.

  Hereinafter, an embodiment in which a lighting device according to the present invention is applied to a street lamp will be described in detail with reference to the drawings. However, the lighting device to which the technical idea of the present invention can be applied is not limited to a street lamp, and includes, for example, all lighting devices used for outdoor lighting such as road lighting.

  As shown in FIG. 1, the lighting device (street light) A of the present embodiment includes a first light source 1, a second light source 2, a first power supply unit 3, a second power supply unit 4, an illuminance sensor unit 5, A clock unit 6 and a control unit 7 are provided. The second light source 2 is composed of a light emitting diode that emits light having a color temperature (about 5000 Kelvin) that has been conventionally used in street lighting. On the other hand, the first light source 1 is composed of a light emitting diode that emits light having a color temperature higher than that of the second light source 2 (for example, about 8000 Kelvin).

  Each of the first and second power supply units 3 and 4 includes a switching power supply (for example, a step-down chopper circuit) whose output voltage is variable. The illuminance sensor unit 5 includes, for example, a solar cell, and outputs the output voltage of the solar cell that changes in accordance with ambient brightness (ambient illuminance) to the control unit 7 as a detection voltage. The clock unit 6 measures the current time using, for example, an oscillator using a crystal resonator. The control unit 7 has a microcomputer as a main component, and executes a control operation described later by executing a program stored in the memory by the microcomputer.

  FIG. 2 is an external view of the illumination device A of this embodiment. The lighting device A includes a lamp body 100 and a support 110. The support 110 is made of a columnar metal body, and the lower part is embedded in the ground. The lamp body 100 is attached to the upper end of the column 110. The lamp body 100 is formed in a long and narrow box shape with an open bottom surface. As shown in FIG. 3, a plurality of light emitting diodes as first and second light sources 1 and 2 are arranged inside the lamp body 100 so as to be adjacent to each other vertically and horizontally. Although not shown, the lamp body 100 is provided with a reflecting member and a diffusing member, so that the two types of light emitted from the first and second light sources 1 and 2 are appropriately mixed and the road surface. Irradiated evenly.

  Here, the illuminance sensor unit 5 is installed at the upper end of the lamp body 100 so as not to detect light (artificial light) emitted from the first and second light sources 1 and 2 (see FIG. 2). .

  Next, the control operation of the control unit 7 will be described with reference to the time chart of FIG. In FIG. 4, the horizontal axis indicates time, and the vertical axis indicates the light amounts of the first and second light sources 1 and 2, respectively.

  When the ambient illuminance detected by the illuminance sensor unit 5 is equal to or greater than a predetermined threshold value, the control unit 7 turns off both the first and second light sources 1 and 2. Then, when the sun leans near sunset, the ambient illuminance detected by the illuminance sensor unit 5 falls below the threshold (time t = t1 in FIG. 4). When the ambient illuminance falls below the threshold value, the control unit 7 turns on the second light source 2 at the rated power and turns on the first light source 1 with a delay after the second light source 2 (time t = t2 in FIG. 4). ). Here, the control unit 7 gradually increases the light amount of the first light source 1 as the ambient illuminance detected by the illuminance sensor unit 5 decreases (as time t progresses). In FIG. 4, the light amount of the second light source 2 is indicated by a solid line M, and the light amount of the first light source 1 is indicated by a broken line N.

  Thus, when the sun starts to tilt, the control unit 7 gives a psychological relief by rated lighting of the second light source 2 having a low color temperature, and prevents the landscape from being disturbed. In addition, until the sun is completely set (time t1 to t2), the control unit 7 increases visibility by gradually increasing the light amount of the first light source 1 having a relatively high color temperature. Then, after the sun has completely set, the control unit 7 turns on the first and second light sources 1 and 2 at rated power so as to provide a psychological sense of security while ensuring visibility.

  That is, when the environment becomes dark, it is possible to efficiently ensure the visibility of a passerby by turning on a high color temperature light source (first light source 1) that contains a relatively large amount of short wavelength components. If the low color temperature light source (second light source 2) is turned on, the psychological anxiety of the passerby can be reduced by increasing the brightness, and the deterioration of the landscape can be suppressed by reducing the color temperature. In addition, the visibility shifts in the short wavelength direction due to the decrease in brightness, so the visibility is improved efficiently by relatively increasing the short wavelength component in the illumination light as it darkens during sunset. It is done. Such a relative gradual increase of the short wavelength component can be achieved by controlling a high color temperature light source (first light source 1) containing a relatively large amount of the short wavelength component. On the other hand, the low color temperature light source (second light source 2) functions to ensure the brightness of the environment and the color temperature to be low, thereby ensuring a sense of security for a passerby and a favorable landscape. Therefore, the low color temperature light source (second light source 2) is linked with the time, so that the low color temperature light source (second light source 2) can be turned on only when there are many passersby, and it is easy to provide the passersby with a sense of security and a favorable landscape.

  In the present embodiment, when the current time measured by the clock unit 6 passes midnight time t = t3 (for example, 2:00 am), the control unit 7 turns off the second light source 2 and the first light source 1. Only the rated light is turned on (see Fig. 4). Thereby, the first light source 1 is rated on to ensure visibility, and the second light source 2 is turned off to save energy. In other words, in low-traffic times, the importance of passersby's psychological anxiety and scenery is reduced, so energy is saved by reducing the output of the low color temperature light source (second light source 2). Can be achieved. Although the brightness of the space is reduced, the visibility peak is greatly shifted in the short wavelength direction. Therefore, by illuminating with a high color temperature light source (first light source 1) containing relatively short wavelength components, Visibility can be secured efficiently.

  The next morning, when the sun starts to rise and the ambient illuminance detected by the illuminance sensor unit 5 begins to rise, the control unit 7 gradually decreases the light amount of the first light source 1 and the ambient illuminance becomes equal to or greater than the threshold The first light source 1 is turned off at (time t = t4).

  However, when the control unit 7 changes the light amount of the first light source 1, it does not necessarily need to be gradually increased or decreased with time. For example, as shown in FIG. 5, at the time t = t2 when the sun completely sunk, the control unit 7 turns on the first light source 1 at a rate and the ambient illuminance detected by the illuminance sensor unit 5 is the threshold. The first light source 1 may be extinguished at a time when the value exceeds the value (time t = t4).

DESCRIPTION OF SYMBOLS 1 1st light source 2 2nd light source 5 Illuminance sensor part 7 Control part

Claims (3)

An illumination device installed outdoors, an illuminance sensor unit that detects ambient illuminance of the outdoor, a first light source that emits light having a relatively high color temperature, and the first light source A second light source that emits light having a color temperature lower than that of the light, and a controller that controls the blinking and light amount of the first and second light sources,
The control unit turns off the first and second light sources when ambient illuminance detected by the illuminance sensor unit is greater than or equal to a predetermined threshold, and when the ambient illuminance falls below the threshold, An illumination device characterized in that the second light source is lit at a rated power and the first light source is lit at a later time than the second light source.   The lighting device according to claim 1, wherein the control unit increases the amount of light of the first light source as ambient illuminance detected by the illuminance sensor unit decreases.   A clock unit that counts the current time is provided, and the control unit reduces the light amount of the second light source to a predetermined lower limit when the current time measured by the clock unit passes midnight. The lighting device according to claim 1 or 2.

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