JP2002289031A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce any possible occurrence of self on-and-off light function. SOLUTION: This lighting device controls the light operation which detects brightness at the spot nearby the front side by using a brightness sensor 8 such as cds element designed and fitted at a certain wall side 1 facing oppositely to the counterpart side wall 7, controls to light on the light source 3 consisting of the chip-type LED during darkness in the surroundings and controls to light out the light source 3 during brightness. The light source 3 is fitted to face the irradiation direction right in front of the opposite side wall 7 in keeping the brightness sensor 8 and not receiving substantially the reflected light (the virtual dotted line in drawing 4) from the opposite wall 7 by using the lens 4 (the transparent light cover of almost flat face) fitted at the front side of the light source 3 in setting the irradiation direction substantially as non-frontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device which is preferable as a foot light.

[0002]

2. Description of the Related Art A lighting device is known which detects the brightness near the front by a brightness sensor and controls the light source to be turned on when the surroundings are dark and to turn off the light source when the surroundings are bright. It is used as a foot light.

[0003]

However, the light source light of the light source itself may enter the brightness sensor. As a typical example, such a lighting device is installed on a wall having a wall facing the front, and a brightness sensor is provided in the lighting device so as to face the wall facing the front. It is. In this case, since the brightness sensor is installed so as to detect the brightness near the front, if the irradiation direction of the light source is provided so as to face the wall facing the front, the own light source light faces the front. The light is reflected on the wall and enters the brightness sensor. Then, by the light emitted from its own light source that was once turned on due to the darkening of the surroundings,
Since the brightness sensor recognizes that the surroundings have become brighter, the light is turned off, and so-called self-blinking may occur repeatedly. 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 illustrated embodiment, a brightness sensor 8 such as a cds element is installed on a wall 1 having a wall 7 facing the front, and is provided so as to face the wall 7 facing the front.
A lighting device that detects the brightness in the vicinity of the front and controls the lighting of the light source 3 including a chip type LED (light emitting diode) when the surroundings are dark, and turns off the light source 3 when the surroundings are bright. Numeral 3 is provided so that the irradiation direction thereof is opposed to a wall surface 7 facing the front, and the irradiation direction is substantially non-front direction by a lens (substantially flat face type light-transmitting cover) 4 provided on the front surface of the light source 3. An illumination device in which reflected light from the wall surface 7 facing the front (virtual dotted line in FIG. 4) does not substantially enter the brightness sensor 8.

An LED foot light installed below the wall surface 1 to illuminate the floor 2 uses a chip-type LED as the LED 3 and is provided so that the irradiating direction is the front direction. L on the front of LED3
L provided with a lens (substantially flat face type translucent cover) 4 for refracting light from the ED 3 at least downward.
ED foot light. The lens 4 diffuses the light from the LED 3 in the horizontal direction and adapts the light to the longitudinal direction of the floor 2 as the lower surface of the hallway so that the light can be emitted. Specifically, when the height of the LED 3 is set to 20 to 40 cm from the floor surface 2 and the lens 4 is formed of a transparent acrylic resin, the angle θ of the Fresnel lens 5 formed on the inner surface in the lateral direction is 15 to 60 ° (more preferably). Is 30 to 40 °), the pitch p of the wavy surface 6 formed on the outer surface in the longitudinal direction is 200 to 500 μm, and the depth d is 100 to 500 μm.
It is 200 μm.

[0010] The structure of the LED foot light will be described in detail. The LED foot light is embedded in the wall 1 in the corridor consisting of the wall 1, the wall 7, and the floor 2. That is, a frame-shaped plate 10 is fixed to the front surface of the opening 9 of the wall surface 1 with screws (not shown) or the like, and the lighting circuit block 11 is fixed to the back surface of the opening of the plate 10. The lighting circuit block 11 includes a brightness sensor 8 and a brightness sensor 8.
A board 13 on which a control circuit 12 for controlling the turning on / off of the LED 3 in response to a signal from the controller 3 is mounted. On the front surface of the lighting circuit block 11, the substrate 1 on which the LED 3 is mounted
A reflector 4 is provided on the front surface of the substrate 14 so as to surround the LED 3 and penetrate the plate 10. A transparent cover type lens 4 is provided so as to cover the LED 3 and the reflector 15. The brightness sensor 8 is inserted into a light shielding tube 16 provided on the front surface of the lighting circuit block 11,
The light shielding tube 16 penetrates the plate 10. Plate 1
A decorative cover 17 having a shape exposing the brightness sensor 8 and the lens 4 is fitted on the front surface of the lens 0.

In this lighting device, since the surroundings have become darker in the evening, the brightness sensor 8 recognizes that the surroundings have become brighter by the light emitted from its own light source 3 whose lighting is once controlled by the brightness sensor 8. The illumination may be turned off, and the so-called self-blinking may occur repeatedly. This is because the irradiation direction is substantially changed to the non-front direction by the lens 4 provided on the front surface of the light source 3. 7 (virtual dotted line in FIG. 4) so as not to substantially enter the brightness sensor 8.
Since the light from the own light source 3 does not substantially enter the brightness sensor 8, the possibility of self-blinking can be reduced or eliminated.

In this LED foot light, a chip type LED 3 is used, and its irradiation direction is a front direction which is advantageous for mounting.
Since the lens 4 for refracting light from at least downward is provided, that is, the lateral Fresnel lens 5 is formed on the inner surface of the lens 4, it is possible to contribute to the improvement of the illuminance of the floor surface 2. Further, since the lens 4 diffuses the light from the LED 3 in the horizontal direction, that is, since the corrugated surface 6 is formed in the vertical direction on the outer surface of the lens 4, it can be irradiated in a manner adapted to the longitudinal direction of the floor surface 2 which is the lower surface of the hallway. And This state is shown in FIG. 5, and it will be easily understood that an elliptical light distribution matching the longitudinal direction of the floor 2 is obtained. When the height of the LED 3 is 20 to 40 cm from the floor surface 2 and the lens 4 is formed of a transparent acrylic resin, as shown in FIG. 3, the angle θ of the Fresnel lens 5 formed on the inner surface in the horizontal direction is 15 to 60 °
(More preferably 30 to 40 °), and if the pitch p of the wavy surface 6 formed on the outer surface in the vertical direction is 200 to 500 μm and the depth d is 100 to 200 μm, a good floor light distribution can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view

FIG. 2 is a sectional view of the same.

FIG. 3 is a perspective view of a lens.

FIG. 4 is a sectional view of an installed state.

FIG. 5 is a perspective view of the same.

[Explanation of symbols]

 Reference Signs List 1 wall 3 light source (LED) 4 lens 7 wall 8 brightness sensor

Claims (2)

[Claims] 1. A brightness sensor installed on a wall having a wall facing the front and provided so as to face the wall facing the front detects brightness near the front, and turns on a light source when the surroundings are dark. A lighting device that controls lighting and turns off a light source when the surroundings are bright, and the light source is provided so that the irradiation direction thereof is opposed to a wall surface facing the front, and the illumination direction is provided by a lens provided in front of the light source. A substantially non-frontal direction, so that light reflected from a wall facing the front is substantially not incident on the brightness sensor. 2. The light source according to claim 1, wherein the light source is a chip type LE.
D. An illuminating device provided with a lens on its front surface that refracts an irradiation direction substantially in a non-front direction.