JP2002245841A - Lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce self-flashing of a lighting equipment. SOLUTION: For the lighting equipment, controlling a light source 2 like a light emitting diode by lighting when environment becomes dark, and controlling a light source 2 by turning off when environment becomes light, by detecting the lightness of the environment by a light sensor 1 like a cds, an optical filter 3 with a property of practically blocking the spectrum of the light source 2, and transmitting a part of solar light spectrum, is installed in front of the light sensor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture suitable for being installed in a corridor or the like.

[0002]

2. Description of the Related Art There is known a lighting fixture that detects the brightness of the surroundings by a brightness sensor and controls the lighting of the light source when the surroundings are dark, and controls the light source to be turned off when the surroundings are bright.
It is used as a foot light in corridors.

[0003]

However, there is a case where the own light source light is incident on the brightness sensor. For example, when the lighting fixture is installed on a wall in a corridor, its own light source light may be reflected on the opposite wall and enter the brightness sensor. Moreover, there is a possibility that the light source light of the own device leaks directly to the brightness sensor side due to the structure of the device. In that case, the light emitted from its own light source once turned on due to the darkening of the surroundings causes the brightness sensor to recognize that the surroundings have become brighter, and it turns off the light, and so-called self-flashing occurs repeatedly was there. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and has as its object to reduce the possibility of occurrence of self-blinking.

[0004]

Means for solving the problems are as described in the claims.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described. However, this is merely an exemplary embodiment adopted based on the present invention, and the present invention is described based on matters specific to the embodiment. Therefore, the technical scope of the present invention should be determined based on the matters stated in the claims and matters substantially equivalent to the matters.

In the embodiment shown in FIG. 1, the brightness of the surroundings is detected by a brightness sensor 1 such as a cds, and the light source 2 such as a light emitting diode is controlled to be turned on when the surroundings are dark, and the light source is controlled when the surroundings are bright. In the lighting apparatus for controlling the turning off of the light source 2, an optical filter 3 having a characteristic of substantially blocking the emission spectrum of the light source 2 and transmitting a part of the sunlight spectrum is provided in front of the brightness sensor 1. It is.

[0007] The structure of the lighting fixture will be described in more detail. The lighting fixture is embedded in the wall 5 of the corridor 4 and installed. That is, a frame-shaped plate 7 is fixed to the front surface of the opening 6 of the wall surface 5 with screws or the like (not shown), and the lighting circuit block 8 is fixed to the back surface of the opening of the plate 7.
The lighting circuit block 8 has a built-in board 10 on which a brightness sensor 1 and a control circuit 9 for controlling the turning on / off of the light source 2 by receiving a signal from the brightness sensor 1 are mounted.
On the front surface of the lighting circuit block 8, a substrate 11 on which a light emitting diode chip constituting the light source 2 is mounted is provided.
1 is covered with a light-transmitting cover 12. The brightness sensor 1 is mounted in a state of being inserted into the light-shielding tube 13, and an optical filter 3 is mounted on a front edge of the light-shielding tube 13. Further, a decorative cover 14 having a shape exposing the optical filter 3 and the translucent cover 12 is fitted on the front surface of the plate 7. In addition, 15 is a wall surface facing the wall surface 5.

When the lighting apparatus is installed as described above, light from its own light source 2 is applied to the facing wall surface 1 as described above.
There is a possibility that the light is reflected by the light 5 and enters the brightness sensor 1. In this case, the light emitted from its own light source 2 whose lighting has been once controlled by the brightness sensor 1 because the surroundings have become dark in the evening, conventionally, the brightness sensor 1
Is recognized as having brightened surroundings, and is turned off, and so-called self-flashing may occur repeatedly. In the present embodiment, the light from the own light source 2 is supplied to the brightness sensor 1 by providing the optical filter 3 having a characteristic capable of substantially blocking the emission spectrum of the light source 2 and transmitting a part of the sunlight spectrum. Since the light does not substantially enter, the possibility of occurrence of self-blinking can be reduced or eliminated. In addition, since the optical filter 3 is capable of transmitting a part of the sunlight spectrum, the brightness sensor 1 senses when the surroundings become bright in the morning, and the light source 2 can be turned off.

Next, a preferred embodiment of the present invention will be described. First, FIGS. 2 and 3 show a light source 2 having a spectral characteristic that emits light in a narrow band within a visible wavelength band, for example, an amber light emitting diode (LED). The following shows the spectrum characteristics in the case of using a material that substantially blocks only the spectrum. In this example, the narrow-band emission spectrum 21 of the LED light source 2 can be easily cut off by the narrow-band cutoff characteristic 22 of the optical filter 3 and can contribute to the prevention of self-blinking.
Since only a part of the sunlight spectrum 23 is blocked and most of the sunlight spectrum 23 is transmitted through the optical filter 3 (transmitted light spectrum 24), the light-off control when the surrounding area becomes bright is surely performed.

FIGS. 4 and 5 show a light source 2 having a spectral characteristic that emits light in a relatively wide band within a visible wavelength band, for example, a white light emitting diode (LED). 2 shows a spectrum characteristic when a substance having a characteristic of substantially blocking only the emission spectrum of No. 2 is used. In this example, a relatively broad band emission spectrum 31 of the LED light source 2 can be substantially blocked by the optical filter 3 having a relatively wide band blocking characteristic 32 to contribute to the prevention of self-blinking and the sunlight spectrum 33.
Although the light is cut off in a relatively wide band, there is also a sufficient band that passes through the optical filter 3 (transmitted light spectrum 34), so that there is no problem in turning off the light when the surrounding area becomes bright.

[Brief description of the drawings]

FIG. 1A is a sectional view of an installation state, and FIG.

FIG. 2 is a spectrum characteristic diagram of a light source and an optical filter according to an example.

FIG. 3 is a spectrum characteristic diagram of sunlight and an optical filter according to an example.

FIG. 4 is a spectrum characteristic diagram of a light source and an optical filter according to another example.

FIG. 5 is a spectrum characteristic diagram of sunlight and an optical filter according to another example.

[Explanation of symbols]

 1 brightness sensor 2 light source 3 optical filter

Claims (3)

[Claims] 1. A lighting fixture for detecting the brightness of the surroundings by a brightness sensor and controlling the lighting of the light source when the surroundings are dark and controlling the extinguishing of the light source when the surroundings are bright. A lighting device provided with an optical filter having characteristics capable of substantially blocking an emission spectrum of the light source and transmitting a part of a sunlight spectrum. 2. The lighting apparatus according to claim 1, wherein the light source has a spectral characteristic of emitting light in a narrow band within a visible wavelength band, and the optical filter substantially blocks only the emission spectrum of the light source. 3. The lighting apparatus according to claim 1, wherein the light source has a spectral characteristic that emits light in a relatively wide band within a visible wavelength band, and the optical filter substantially blocks only the emission spectrum of the light source. .