JPH06251607A - Luminaire provided with directivity - Google Patents

Abstract

PURPOSE:To provide a luminaire capable of lighting widely or narrowly in a specific direction even by the same light source by arranging a light distribution plate, having anisotropism at an specific angle in a light refraction characteristic, in the front of the light source, and providing directivity in light radiated from the light source. CONSTITUTION:A light source 2 of electric lamp or the like is mounted in a casing 4 by a lighting fixture 3, and a light distribution plate 10, having 90 deg. anisotropic in a light refraction characteristic, is arranged in the lighting part front of the casing 4 to manufacture a luminaire 1 provided with directivity. Thus in a lighting range by the luminaire 1, the lighting range is spread as shown by (w) relating to a floor surface 6 in a predetermined one axial direction, and on the other hand in the case of viewing from a side surface in a direction orthogonal to this floor surface, the lighting range is reversely narrowed as shown by (n). Accordingly, lighting can be obtained by distributing light, radiated from the light source 2, at a large spread angle and at a narrow spread angle in a specific 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, and more particularly,
The present invention relates to a luminaire having directivity that can selectively illuminate a specific direction in a strip shape with the same light source.

[0002]

2. Description of the Related Art In a conventional lighting apparatus, for example, as shown in FIG. 6, an outer casing 41 having a reflector is provided on the back of a light source 42 such as an electric lamp, and a protective lens 43 is provided on the front surface of the light source 42. It was installed and configured. It should be noted that FIGS. 9A and 9B respectively show a situation in which the side surfaces of the lighting fixture 40 are viewed from directions orthogonal to each other. That is, according to the conventional luminaire, as shown in FIGS. 6 (A) and 6 (B), the illumination light 45 causes the irradiation light 45 to have an equal spread angle with respect to the floor 6 around the luminaire 40. Was the lighting of. As a conventional lighting device, in addition to this, as a lighting device for obtaining directivity, a lighting device having a slight directivity using a louver, or a lens mounted on the front surface of the light source to There are also floodlights that provide local illumination with a narrow divergence angle in the center.

[0003]

By the way, according to the conventional luminaire, it is suitable for illuminating the light source mounting position in four directions with substantially the same spread as in the case of normal indoor lighting, but it is suitable for underpasses and underpasses. It was not appropriate when illuminating a long space in a specific direction, such as lighting inside a tunnel. In addition, illumination using a louver could not obtain sufficient directivity for illumination of an extremely long space in one direction such as an underground passage or the inside of a tunnel. On the other hand, when illuminating a long and narrow space such as an underpass or inside a tunnel, trying to save the number of lighting fixtures creates bright and dark illuminance in the space, and many lighting fixtures are required to reduce the brightness. There was a problem. Thus, the conventional one is not suitable as a lighting fixture that can efficiently illuminate a long space in a specific direction such as an underpass or the inside of a tunnel.
Therefore, when it is used as a lighting device for such a place, there is a problem that the lighting is wasted in a narrow zone. An object of the present invention is to provide a lighting fixture that solves the above-mentioned problems (problems) of the conventional one.

[0004]

In order to solve the above-mentioned problems, in a luminaire having directivity according to the present invention, a light distribution plate having a 90-degree anisotropy in light refraction characteristics is provided in front of a light source. It is configured to be arranged.

[0005]

As described above, according to the present invention, since the light distribution plate disposed in front of the light source has a 90-degree anisotropy in the light refraction characteristics, the light from the light source may vary depending on the mounting direction of the light distribution plate. Irradiation is performed with a narrow divergence angle in one predetermined direction and with a wide divergence angle in a direction orthogonal to the above direction. Therefore, when this luminaire is installed, the illumination characteristic is such that only a narrow range can be illuminated in the predetermined one-axis direction according to the above-mentioned illumination characteristic, while the illumination characteristic reaches a far range in the axial direction orthogonal to this axial direction. The illumination characteristic is such that the range is the long axis.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of a lighting fixture having a directional characteristic according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view for explaining an example of a lighting fixture according to the present invention, and FIGS. 1A and 1B are views showing the same lighting fixture viewed from a side in a direction orthogonal to each other. Shows.
It should be noted that in FIG. 1, for simplicity, the mounting means of the lighting fixture, the power supply line, etc. are omitted. 1 (A) and 1 (B), a light source 2 such as an electric light is attached to a luminaire 1 by an illuminating device 3 which is attached to an outer casing 4 whose inner surface is formed to have a predetermined reflection characteristic. A light distribution plate 10 described later is mounted on the front surface of the part. As for the light distribution plate 10, the light distribution plate functions like an opaque plate in a range where the incident angle of light with respect to the light distribution plate (angle formed by the light beam and the light distribution plate) is narrow, and the incident angle is determined by the characteristics of the light distribution plate. When the angle is more than the angle, the light distribution plate functions so that it looks transparent, and the characteristic change angle is different in the direction of 90 degrees on the light distribution plate, and the light refraction characteristic is 9
It is configured by using a light transmission plate having a light transmission characteristic having anisotropy of 0 degree.

FIG. 2 is a vertical sectional view showing an example of the structure of the light distribution plate 10. As such a structure, for example, a field-selection glass (trade name: Angle 2 manufactured by Nippon Sheet Glass Co., Ltd.) is used.
It is appropriate to use 1). That is, as shown in FIG. 2, the light distribution plate 10 includes a plate glass (or plastic plate) 11 covering both surfaces thereof, and a polymer film 12 made of a special material having a characteristic of changing a transmission state depending on an incident angle of light. ，
Intermediate film 1 provided between plate glass 11 and polymer film 12
It is composed of 3 combinations. In FIG. 2, the light distribution plate 1
For the sake of simplicity, the thickness of each constituent element of 0 is shown as the same thickness.

FIG. 3 is a schematic side view showing a measuring method for obtaining the characteristics shown in FIG. 4, and as shown in the figure, a pin spot P provided on a light source 1T equipped with the light distribution plate (not shown).
Is to measure the illuminance on the floor surface 6 at a position 700 mm below. As shown in the figure, right below the light source 1T (0 degree), and 10 degrees in both left and right directions of a predetermined axis with a large illumination spread angle due to the lighting fixture equipped with the light distribution plate.
The measurement was performed at an irradiation point of 30 degrees, and also when the light distribution plate was not attached. In FIG. 3, the light source body 1
One direction from 0 degrees at the bottom of T is shown as − degrees, and the opposite direction is shown as + degrees. FIG. 4 shows a characteristic diagram measured under the situation of FIG. 3 as described above. The horizontal axis represents the angle at which the measurement point (irradiation point) is seen from the pin spot light source P, and the vertical axis represents the illuminance (L _X )
Indicates. As shown in the figure, the illuminance on the floor when directly illuminated by the pin spot light source P without the light distribution plate has a characteristic that only a narrow zone directly below the light source P is illuminated as shown by a curve b. On the other hand, when the floor surface is illuminated by the pin spot light source P equipped with the light distribution plate, the characteristic in the predetermined axis direction is that the illuminance spreads in both left and right directions as shown by the curve a. . The illumination characteristic in the axial direction orthogonal to the direction indicated by the curve a in the pin spot light source provided with the light distribution plate is not shown, but is similar to the curve b (however, the level is a little lower). It has been confirmed that Therefore, by using the light distribution plate having the characteristics as shown in FIG. 4 as the front plate of the luminaire, local illumination by direct light can be diffused with uniform illuminance in the longitudinal direction as shown in FIG. Was known.

The present invention is characterized by the fact that the light distribution plate 10 is constructed as the luminaire shown in FIG. 1 by paying attention to the physical property that the light distribution plate 10 has the above-mentioned illuminating characteristics by the experiment of the applicant. . As a result of such a configuration, the illumination range of the lighting fixture 1 in which the light distribution plate 10 is arranged in front of the light source spreads in a predetermined uniaxial direction with respect to the floor surface 6 as shown by w in FIG. 1 (A). On the other hand, it was confirmed that the illumination range of FIG. 1B showing the direction orthogonal to the measurement axis of FIG. 1A is a narrow illumination range as indicated by n, on the contrary. FIG. 5 is a plan view of the illumination situation of FIG. 1 seen from above. In FIG.
Reference numeral 1 of the present invention indicates a lighting fixture, and 1A indicates an isolux line obtained by smoothing and connecting the same illuminance points of the lighting fixture 1. 1w of the isolux line 1A corresponds to the wide illumination range w shown in FIG. 1 (A), and n corresponds to the narrow illumination range n shown in FIG. 1 (B). Therefore, if the lighting equipment of the present invention is adopted, it is suitable for illuminating a long space in a specific direction such as an underpass or a tunnel, and the direction that is the long axis of the illuminance characteristic of the light distribution plate 10 is defined as the above-mentioned space. By matching the longitudinal direction, the illumination range in the longitudinal direction can be increased by the same light source.
On the other hand, it is possible to perform efficient illumination by reducing the illumination range in the road width direction.

The above description shows the basic method and configuration for realizing the technical idea of the present invention, and can be variously applied and modified. For example, for the light distribution plate, a field of view selection glass manufactured by Nippon Sheet Glass Co., Ltd. (Product name: Angle 21)
Although the example using has been described, it goes without saying that other products having similar characteristics may be used. Further, it goes without saying that a light distribution plate having appropriate characteristics may be selected and used according to the dimension ratio in the direction perpendicular to the space to be illuminated, and the type of light source, the shape of the reflecting portion, etc. may be selected and set appropriately.

[0011]

As described above, the present invention improves the light refraction characteristics.
Since the light distribution plate having anisotropy of 0 degree is arranged in front of the light source, it has the following excellent effects. The light emitted from the light source can be distributed and illuminated in a specific direction with a large divergence angle. The light emitted from the light source can be distributed and illuminated in a specific direction with a narrow spread angle. A single light source can efficiently illuminate an elongated space. Therefore, it is suitable as a lighting fixture arranged in a space long in a specific direction such as an underpass or a tunnel, and the number of lighting fixtures for such an application can be reduced. In addition, when used as a lighting fixture to be installed in a narrow space in a specific direction such as an underpass or a tunnel, the lighting of a zone in a specific direction, which was a wasteful lighting in the conventional lighting fixture, is replaced by this narrow zone. It is possible to make the lighting in a proper range that matches the lighting conditions.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining a lighting fixture and its lighting characteristics according to the present invention, in which FIG. 1A shows a characteristic in which an illumination range is a long axis, and FIG. The arrangement of the lighting fixture which shows the characteristic that the illumination range of the orthogonal direction becomes a short axis is shown.

FIG. 2 is a vertical cross-sectional view illustrating a configuration example of a light distribution plate applied to the present invention.

FIG. 3 is a schematic side view illustrating a characteristic measuring unit of a light distribution plate applied to the present invention.

FIG. 4 is a characteristic diagram of a light distribution plate measured by a measuring unit shown in FIG.

FIG. 5 is a plan view for explaining a schematic shape of an isolux surface of the lighting fixture according to the present invention.

FIG. 6 is a schematic side view illustrating a conventional luminaire and its illuminating characteristics, in which (A) and (B) of FIG. 6 are measured separately in both orthogonal axis directions.

[Explanation of symbols]

 1: Lighting equipment 2: Light source 3: Lighting equipment 4: Outer housing 5: Irradiation light 6: Floor surface 10: Light distribution plate

[Procedure amendment]

[Submission date] April 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of a lighting fixture having a directional characteristic according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view for explaining an example of a lighting fixture according to the present invention, and FIGS. 1A and 1B are views showing the same lighting fixture viewed from a side in a direction orthogonal to each other. Shows.
It should be noted that in FIG. 1, for simplicity, the mounting means of the lighting fixture, the power supply line, etc. are omitted. 1 (A) and 1 (B), a light source 2 such as an electric light is attached to a luminaire 1 by an illuminating device 3 which is attached to an outer casing 4 whose inner surface is formed to have a predetermined reflection characteristic. A light distribution plate 10 described later is mounted on the front surface of the part. As for the light distribution plate 10, the light distribution plate functions like an opaque plate in a range in which the incident angle of the light to the light distribution plate (the angle formed by the normal and the light ray to the light distribution plate) is narrow, and the incident angle is determined by the characteristics of the light distribution plate. When the angle exceeds a certain angle, the light distribution plate appears to be transparent, and the characteristic change angle is changed in the direction of 90 degrees on the light distribution plate, and the light transmission characteristic having the anisotropy of 90 degrees is exhibited. It is configured by using such a light transmitting plate. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kodaira 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A luminaire having directivity, wherein a light distribution plate having a 90-degree anisotropy in light refraction characteristics is disposed in front of a light source.