JPS58145004A - Lighting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting device suitable as a security lighting device.

2. Description of the Related Art For the security of industrial facilities, etc., the surroundings of the facilities are illuminated at night to make it difficult for illegal intruders to do so. However, since the lighting devices conventionally used for this type of purpose were based on the idea of simply brightening the surrounding area, they ended up illuminating the inside of the facility as well, which could actually attract intruders into the facility. However, recently, as shown in Figures 1 and 2, a lighting system has been installed inside the fence F surrounding the facility A to be protected. It has become possible to install lights L, . . . to illuminate the fence F side from the facility A side, and form a bright area B and a dark area on the ground inside the fence F.

In this case, the boundary line CL between regions B and D is called a cut-off line, and it is necessary to make the difference in brightness between regions B and D as large as possible to make the cut-off line CL as clear as possible. If such lighting is used, it will be difficult to see the situation inside the facility from outside the fence due to the significant difference in brightness and darkness and the dazzle from direct light, which may create a sense of psychological pressure on those attempting to trespass. It is possible to prevent illegal trespassing. Furthermore, since the facility A side can completely grasp the external situation, it is possible to take appropriate measures against illegal intrusion.

In order to achieve the desired purpose with the above-mentioned lighting, by making the difference between the brightness and darkness of areas B and D extreme, waiting for a clear cut-off line CL, and then moving the facility side beyond the cut-off line. It is necessary to darken the light rapidly, and it is also necessary to increase the dazzling effect by not attenuating the peak value of the light beam emitted from the light source. However, a lighting device that can meet such demands has not yet been developed, and when a conventional lighting device is used, a clear cutoff line cannot be obtained.

An object of the present invention is to provide an illumination device that can obtain a clear cutoff line on a surface to be illuminated.

The lighting device of the present invention includes a housing having an opening on the front surface and a light-transmitting plate attached to close the opening, and a housing arranged in the housing facing the light-transmitting plate so that each part has a common focal point. a concave mirror existing on a focal axis; a light source arranged such that its central axis substantially coincides with the focal axis of the concave mirror and having a light emitting section extending along the central axis; the transparent plate; It consists of a looper and a light source placed between it and the light source. The above-mentioned loops are made up of a plurality of vanes arranged approximately parallel to a plane defined by the optical axis and focal axis of the concave mirror, and both sides of each vane constituting the looper are exposed to the light emitted from the light source. It has been treated to absorb light.

Loopers have traditionally been used in lighting equipment to block direct light from a light source and provide soft, uniform illumination, but no attempt has been made to use a looper to form a cutoff line on the illuminated surface. . One way to create a cut-off line is to place a lens in front of the light source so that the beam exiting the illuminator is a perfectly parallel beam, but this method significantly narrows the beam width, making it brighter. The area is extremely limited, and if used as shown in Figure 1, the outside of the fence will be dark and the purpose of security cannot be achieved. The inventor has also conducted various experiments using a structure in which a high-intensity light source is placed at the focal point of a concave mirror to converge the beam to a predetermined width, but in this case as well, it was not possible to obtain a clear cutoff line. won. Furthermore, the inventor of the present invention believed that by placing a mirror (5) in front of the light source, it would be possible to block the light emitted from the light source and prevent the beam from spreading. After arranging the light source, we considered a structure in which the light source was placed in front of the light source.

However, by simply arranging the loops in this manner, the cut-off line and the loop are still not clear, and even after repeated experiments with various dimensions and spacings of the looper blades, the results were the same. After conducting various studies on these experiments, we found that the looper is very effective for obtaining the force and to-line, but simply reusing the looper that has been used in the past will reduce the amount of light emitted from the light source. It has become clear that since light is reflected on the surface of each blade of the looper, the cut-off line becomes unclear and it is not possible to increase the difference in brightness on both sides of the cut-off line.

The present invention was made as a result of various studies as described above, and the important points in the present invention are (a) arranging the light source at the focal position of the concave mirror to converge the beam within a predetermined range; ,
(b) In front of the light source, a loop consisting of (6) blades approximately parallel to the plane defined by the optical axis and focal axis of the concave mirror is placed to limit the beam width without attenuating the peak value of the beam. To prevent light from going around to the dark side inside the cut-off line by applying light-absorbing treatment to both sides of each blade of eUuru・9,
and 2) By housing the concave mirror, light source, and roots inside a noun whose front face is closed with a transparent plate, dust is prevented from adhering to the looper, and light is diffusely reflected by the dust adhering to the looper. This is to prevent light from entering the dark areas inside the cut-off line.

Next, the principle of the lighting device of the present invention will be explained with reference to FIG. In the figure, 1 is a housing having a window portion 1a on the front surface, and 2 is a transparent plate made of a glass plate arranged so as to close the window portion 1a. 3 is a transparent plate 2 inside the housing 1
This concave mirror has a focal point of each part on a common axis 2 extending perpendicular to the plane of the drawing, and has a symmetrical shape with respect to the optical axis X (in the example shown, it has a parabolic shape). )
It has a cross section of In this specification, the axis 2 that connects the focal points of each part is called a focal axis. Reference numeral 4 denotes a high-intensity light source formed in a substantially tubular shape with a light emitting part extending along the central axis, such as a thorium lamp or a mercury lamp. It is arranged to match 2. 5 is the roots placed between the transparent plate 2 and the light source 4, and this looper has a concave surface #! Band-shaped blade plates 501, 50 parallel to the plane determined by the focal axis 2 and optical axis X of i3
1°... are arranged in a predetermined number at a predetermined interval and supported on the housing 1 by appropriate means. Both sides of these slats are treated to absorb the light emitted from the light source, for example, with a black matte coating.

When configured as shown in Figure 3, a part of the light emitted from the light source 4 is reflected by the concave mirror (paraboloid*) 3 and is parallel to the optical axis X as shown by the symbols Pt+Pz+...p4 in the figure. It becomes parallel light rays and emerges from between the loopers 5 to the front. If the concave mirror 3 is a parabolic mirror, and if the light source 4 is a perfect line light source, all the light reflected by the concave mirror will be parallel, but in reality, the light source 4 has a thickness that is equal to that of the concave mirror 3. Since light is emitted even from a position out of focus, the symbol qt is shown in the figure.
As shown by tq, there are also reflected lights that are not parallel to the optical axis X, and these reflected lights hit the blades of the looper 5 as shown. Light q1 hitting Lou Gu5.

When q is reflected, it goes forward as shown by the symbols q1'+q2' in the figure, but in the present invention, both sides of each blade of the looper are treated to absorb light, so These reflected lights ql'+qg' are never generated. Therefore, the width of the beam due to the reflected light from the concave mirror is approximately determined by the illustrated light P11p4.

Further, another part of the light emitted from the light source 4 goes directly to the looper 5 side without being reflected by the concave mirror 3, and part of it is marked r! As shown in , it directly hits the blade of the looper.

When the light that hits this vane is reflected, the reflected light r! / occurs, but as mentioned above, the light hitting the blades of the looper is absorbed, so the reflected lights r and l do not occur. The other part of the light that comes directly from the light source 4 to the looper side is
It passes between the slats of Roopa and comes out in front. The outer edge of the beam of direct light passing through the looper (9) is marked '2rr3 in the figure.
These lights r2 are determined by the lights shown.

It will be done.

A beam of reflected light whose beam width is approximately determined by the light Pt*1) z and a beam of direct light whose outer edge is determined by the beams r2 and 'r3 merge in front of the beam and exit toward the object to be irradiated. To go.

If the concave mirror 3 is not a perfect parabolic mirror, the edge is defined by the outer edge r2+r3 of the beam of direct light.

When a beam with the outer edge r2 + ra determined as described above is obtained, a cut I is generated at the intersection of the irradiated surface S and the lower outer edge r3.
- Offline CL is formed, and the area behind the cutoff line CL on the irradiated surface S becomes a dark area, and the area B in front of the cutoff line CL becomes a bright area. If it is assumed here that light is reflected at each vane plate of Ru(10)-P, the reflected light r1' etc. shown by the broken line in the figure will reach the dark area, making the cut-off line CL unclear. . However, in the present invention, as mentioned above, each vane plate is treated to absorb light, so no reflected light r, /, etc. occurs.
No unnecessary light reaches dark areas. Therefore, the area behind the cut-off line CL becomes an almost completely dark area, and the cut-off line CL becomes extremely clear.

If you place a light-absorbing Lu-Ma in front of the light source as described above, you can obtain a clear cutoff line, but if dust gets on the Lu-Ma's blades during use, The dust causes diffused reflection, making it difficult to obtain a clear cutoff line. Therefore, in the present invention, the looper is not placed outside the housing, but inside the housing to prevent dust from adhering to the roots. In this way, a clear cutoff line can be maintained for a long period of time even when used outdoors in a dusty location. Also Loopa 5
Since each blade is arranged parallel to the plane determined by the optical axis and the focal axis of the concave mirror, the peak value of the beam is not attenuated in any way, and a sufficient dazzling effect can be obtained.

Next, the present invention will be explained in detail with reference to FIGS. 4 and 5. 4 and 5 show one embodiment of the present invention, with FIG. 4 being a front view and FIG. 5 being an enlarged cross-sectional view taken along line 1--v in FIG. In these figures, reference numeral 1 denotes a box-shaped housing made of aluminum, stainless steel, etc., which is sufficiently reinforced to protect against stones being thrown. body 1
The frame body 104 is attached to the front surface of the box body 102 with a hinge 103 so as to be openable and closable.
Locking means 105 is provided for fixing to.

A window portion 1m is formed on the front surface of the frame body 104, and this window portion 1a
A light transmitting plate 2 made of tempered glass is attached via a gasket 106. Inside the window portion 1a of the frame body 104, there is an inner frame 10 formed by joining members each having a cross section in the shape of a frame.
Support members 108, 108 having a U-shaped cross section and extending in the long side direction of the window portion 1a are fixed to the vertically opposing surfaces of the inner frame 107. These support members 108. A plurality of pieces (two pieces in the illustrated example) are straddled between the support members 108 and 108.
The pillars 502 are arranged at equal intervals in the long side direction of the window portion 1a, and both ends of each pillar are fixed to the support members 108 and 108. Support member 10
Between 8 and 108, there are a number of locations that make up the looper 5 (
In the illustrated example, it is supported at two locations.

A groove 109 is formed in the periphery of the opening 101 of the box body 102, a pad packing 110 is fitted into this groove, and the inner frame 1 is inserted into the groove formed on the front surface of the packing 110.
07 on the box 102 side is engaged. The gaskets 106 and 110 prevent water and dust from entering the housing. Box body 10-, . 2, a concave surface (13)-3 is disposed facing the light-transmitting plate 2 side, and the edge of this concave mirror meets the box body 102.
It is fixed and supported in the opening 101 of. concave mirror 3
A tubular high-intensity light source 4 such as a sodium lung is arranged inside the housing 1 with its central axis aligned with the focal axis 2 of the concave mirror 3, and this light source 4 is supported by a socket (not shown) supported on the side wall of the housing 1. has been done. In addition, when using a light source 4 that has a socket at only one end of a tubular body, such as a storium lamp, a support 6 is provided to support the end of the tubular body that does not have a socket, as shown in the figure. This prevents the central axis of the light source from shifting from the focal axis of the concave mirror due to vibrations, the weight of the light source, etc. In the illustrated example, the support 6 includes a bracket 601 fixed to a housing or a concave mirror by an appropriate means, and a spring 6 that engages with the outer periphery of the light source 4 and presses the light source toward the bracket.
02. In this embodiment, the blade plates 501, 501, . . . of the looper 5 are arranged so as to be substantially parallel to the plane defined by the optical axis In the lighting device, the number and dimensions of the blades of the looper 5 are appropriately set depending on the cut-off line formation position, the distance between the light source and the looper, the width of the beam, and the like. - As an example, in FIG. 5, the distance dl between the light source and the looper is 63W+, and the distance d2 between the blades of the looper
20 gourds, the width dimension d3 of each blade plate 501 is 50 + 1 + I
+, and when we conducted an experiment with this lighting device installed at a position 3 m above the ground, we were able to obtain a clear cutoff line at a position 7 m in front of the lighting device. In this case, the ratio of the illuminance of the ground at a distance of 1 m on both sides of the cut-off line was approximately 1:5, and it was confirmed that a difference in brightness and darkness that could sufficiently achieve the purpose of security was obtained. The thickness of the blade of the looper used in this experiment was 1+tm. In addition, a 135W Su I Rium Lanzo was used as a light source.

In the above embodiment, the blades of the looper are arranged at equal intervals, but depending on the case, the intervals between the blades may be appropriately varied.

In the present invention, the support structure for the concave mirror and the support structure for the light source are arbitrary. Further, it is preferable that the blades constituting the looper 5 be made as thin as possible so as not to attenuate the peak value of the beam.

In this case, depending on the material of the slats, there is a risk that the slats may curve due to their own weight, but in that case, each slat is supported at at least one location (two locations in the above example) in the middle of its longitudinal direction. You can create a structure that does this. In order to make the cut-off line clear, it is necessary to prevent each blade from curving as much as possible and maintain good parallelism of the blades. Further, the housing only needs to have a hermetic structure to at least prevent dust from entering, and its specific structure is not limited to the above example.

As described above, according to the present invention, in front of the light source whose central axis substantially coincides with the focal axis of the concave mirror, there is provided a looper made of a vane plate that is substantially parallel to the plane defined by the optical axis and the focal axis of the concave mirror. Since both sides of each blade are treated to absorb light, it is possible to prevent light from going around to the dark areas outside the outer edge of the irradiation beam and form a clear cutoff line on the irradiated surface. I can do it. Furthermore, since the peak value of the direct beam is not attenuated, the dazzling effect can be enhanced, making it possible to provide ideal illumination especially for security purposes. Furthermore,
Since the looper is placed inside the light-transmitting plate inside the nozzle, it is possible to prevent dust from adhering to the looper and to enable long-term use.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the usage state of the lighting device of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is an explanatory diagram explaining the present invention in detail, and FIG. FIG. 5 is a front view showing an embodiment of the present invention, and FIG. DESCRIPTION OF SYMBOLS 1... Housing, 2... Translucent plate, 3... Concave mirror, 4... Light source, 5... Looper, 501... Feather board. ,・,゛pa(17)

Claims (4)

[Claims] (1) A housing song having a window portion on the front side and a light-transmitting plate attached to close the window portion, and a housing song disposed within the housing facing the light-transmitting plate so that the focal points of each part are on a common focal axis. between the existing concave mirror, a light source arranged so that its central axis substantially coincides with the focal axis of the concave mirror, and whose light emitting part extends along the central axis, and the transparent plate and the light source; and a looper disposed in the looper, the looper is composed of a plurality of vanes arranged substantially parallel to a plane determined by the optical axis of the concave mirror and the focal axis, and each vane constituting the looper has a A lighting device characterized in that both surfaces are treated to absorb light emitted from the light source. (2) The lighting device according to claim 1, wherein the concave mirror is a parabolic mirror whose reflecting surface has a parabolic cross section perpendicular to the focal axis. (3) The lighting device according to claim 1 or 2, wherein the housing has a sealing structure that prevents at least dust from entering. (4) Claims 1 to 3, characterized in that the plurality of vanes constituting the looper are supported at at least one location in the middle portion of each of the vanes in the longitudinal direction to prevent the vanes from curving. The illumination device according to any one of paragraphs.