JP4186724B2 - lighting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting fixture such as a spotlight.
[0002]
[Prior art]
As a conventional vehicular lamp, there is an approximately trumpet-shaped reflecting plate (or reflecting mirror) that obtains substantially parallel reflected light, and a lens provided at an opening of the reflecting plate . This lens is composed of a large number of convex lenses having horizontal stripes (see Patent Document 1) .
[0003]
[Patent Document 1]
JP-A-9-298002 [0004]
[Problems to be solved by the invention]
However, when the reflecting plate is a narrow-angle light distribution reflecting plate as shown in FIG. 11A, the light 101 incident on the lens 100 is obtained as a whole parallel to the optical axis Q, but FIG. In the case of a wide-angle light distribution reflector as shown in FIG. 4B, the reflected light near the opening end away from the optical axis Q is inclined with respect to the optical axis Q. There was a problem of being formed.
[0005]
Accordingly, an object of the present invention is to provide a lighting apparatus that can obtain a highly uniform irradiation pattern by reducing light that falls outside the target irradiation pattern in a combination of a reflector and a lens that changes the irradiation pattern. It is to be.
[0006]
[Means for Solving the Problems]
The luminaire according to claim 1 includes a reflecting plate in which a light source is disposed, and a lens disposed in an opening of the reflecting plate.
The reflection plate is bullet-shaped and has a reflected light parallel to the optical axis near the optical axis, and is a wide-angle light distribution type in which the reflected light near the opening end is inclined with respect to the optical axis.
The lens has a plurality of irregularities formed on the surface in parallel lines or concentric circles to change the irradiation pattern, and transmitted light by reflected light in the vicinity of the opening end inclined with respect to the optical axis is applied to the lens. In order to reduce leakage outside the pattern, the concave and convex portions have an angle formed by a normal line of the concave and convex surface with respect to incident light that is incident on the lens after being reflected from the light source by the light source and the optical axis of the reflective plate. The lens is large at the center of the lens and small as it approaches the periphery from the center of the lens.
[0007]
According to the lighting apparatus of the first aspect, since the inclination of the normal line of the convex lens near the opening end away from the optical axis of the reflecting plate is smaller than that near the optical axis, the light beam near the opening end of the reflecting plate is reduced. Even if the inclination with respect to the optical axis is large, it is possible to reduce the light irradiated to unnecessary parts compared to the conventional case, thereby reducing the light that falls outside the target irradiation pattern and obtaining an irradiation pattern with high uniformity. it can.
[0008]
The lighting fixture according to claim 2 is the lighting device according to claim 1, wherein the irregularities are substantially isosceles triangles in a range in the vicinity of the optical axis of the reflecting plate, and the outside of the range has a long side facing the reflecting plate. The substantially triangular shape has the long side and the short side with respect to the bottom side, the long side is gently inclined, and the short side is vertical or steeply inclined. .
[0009]
According to the lighting apparatus of claim 2, in addition to the effect similar to that of claim 1, the oblique incident light from the vicinity of the opening end of the reflecting plate is incident on the substantially triangular long piece of the lens, so that it has a substantially isosceles triangular shape. As compared with the above, the reflectance becomes lower and the incidence rate of light incident on the lens can be increased.
[0010]
The lighting fixture according to claim 3 is the lighting device according to claim 1 or 2, wherein the reflector is disposed in a lamp body, and the lens is placed on a bottom surface in a frame that can be fixed to an opening of the lamp body, There is a chipped ring-shaped spring member that presses and fixes the periphery of the lens to the bottom surface, and a groove that is locked by elastically expanding the spring member while holding the lens by the spring member is formed in the frame. Is provided.
[0011]
According to the lighting apparatus of claim 3, in addition to the same effects as those of claim 1 or 2, the lens can be attached and detached by elastically expanding and contracting the diameter of the spring member, so that the structure is simple and assembled. It is easy, and at the same time, a plurality of lenses can be fixed by a single spring member, and exchange is easier than in the case where a plurality of lenses are fixed by an independent fixing method.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. That is, the spotlight has a reflector 1, a lens 2, and a lamp body 3.
[0013]
First, as shown in FIGS. 5 and 6, the lamp body 3 has a substantially trumpet shape or a cannonball shape, and a lamp socket 8 is built in the top, and a light source 9 is attached to the lamp socket 8 and is arranged in the lamp body 3. is doing. Arms 4 are rotatably provided on both sides of the lamp body 3, a main body 5 having an electronic transformer is provided between the ends of the arm 4, and a wiring duct plug 6 connected to a wiring duct (not shown) on the main body 5. Is provided. Reference numeral 7 denotes a lead wire led to the lamp socket 8 from the main body 5 side. In addition, an irregularity in which an L-shaped groove is formed in one of the lamp body 3 and the frame 10 and a projection is formed in the other so that the frame 10 is fitted and rotated to the opening of the lamp body 3 and is locked. The fitting part 12 can be attached by a thumbscrew 11 provided on the lamp body 3 and an L-shaped slit provided on the frame 10 through which the thumbscrew 11 can be inserted.
[0014]
The reflecting plate 1 is also substantially in the shape of a trumpet or a shell, and a light source 9 is disposed inside. That is, the reflecting plate 1 is inserted inside the lamp body 3, and the light source 9 is arranged inside the reflecting plate 1. In the embodiment, the reflecting plate 1 is a substantially parabolic circular reflecting plate, and is formed so as to reflect to the outermost end of the irradiation pattern at the opening end in order to obtain a desired irradiation pattern, and the light source 9 penetrates. It forms so that it may irradiate to the center (directly downward direction) of an irradiation pattern gradually toward an upper end part. Specifically, the angle formed by the reflected light L of the opening of the reflecting plate 1 with the optical axis Q is the maximum and is formed so as to be substantially parallel to the optical axis Q toward the upper end.
[0015]
The lens 2 is disposed in the opening of the reflecting plate 1. This lens 2 is a circular lens, and a large number of irregularities 13 are formed in parallel lines on one side, and a normal P of the irregular surface with respect to incident light that is reflected from the light source 9 and is incident on the lens 2. The angle α formed with the optical axis Q of the reflecting plate 1 is large at the center of the lens 2 and becomes smaller as it approaches the periphery of the lens 2. In the embodiment, the objective is to change the circular irradiation pattern to an oval shape by applying it to a spotlight, and the lens 2 for changing the light irradiation characteristic has the same diameter as the opening diameter of the reflector 1, and the optical axis Q Are formed on the concave surface facing the reflector 1 in the shape of a rib parallel to the vertical or horizontal direction. The width W of the rib-shaped uneven shape is equally spaced, and the uneven shape is an arc shape or a substantially isosceles triangle shape in a cross section passing through the center of the lens 2 and orthogonal to the unevenness 13. An arc shape or an isosceles triangle has a low angle (angle formed by a base and a hypotenuse) of α0 degrees, and a low angle of an adjacent rib is α1 = α0−β. The nth rib from the center is set to αn = α0−nβ (αn> 0). α is determined by the desired spread. For example, when it is desired to irradiate within the range of about 20 degrees from the optical axis Q, α is set to 36 degrees.
[0016]
αn and β are determined by an angle incident on the lens 2 reflected from the vicinity of the opening of the wide-angle reflecting plate 1. For example, if the objective is to irradiate within the range of about 20 degrees from the optical axis Q, and the angle between the incident light to the lens 2 and the optical axis Q at the opening of the reflector is 10 degrees, αn is 19 degrees. , Β may be (α0−αn) / n depending on the number n of irregularities from α0 to αn.
[0017]
As described above, the reflector 1 is disposed in the lamp body 3, and the lens 2 is placed on the bottom surface in the frame 10 that can be fixed to the opening of the lamp body 3. A chip ring-shaped spring member 14 is prepared for pressing and fixing the periphery of the lens 2 to the bottom surface, and the groove 15 to be locked by elastic expansion of the spring member 14 while the lens 2 is pressed by the spring member 14 is formed in the frame 10. It is provided inside. And the recessed part and screw hole of the uneven | corrugated fitting part 12 are formed in the outer periphery of the opening edge part of the lamp | ramp body 3, and the frame 10 forms the protrusion 12a (FIG. 9, 10) fitted to a recessed part, and the thumbscrew 11 An insertion hole through which the screw is inserted is formed to face the screw hole. Details of fixing the lens 2 will be described in the context of the fourth embodiment.
[0018]
Reference numeral 17 denotes a glare cut cap that covers the front surface of the light source 9.
[0019]
According to this embodiment, when the irregularities 13 are the same arc shape or substantially triangular shape, particularly when combined with a wide-angle reflector, as shown in FIG. Since the light reflected from the reflecting plate 1 is incident obliquely, the light transmitted from the lens 2 is inclined as compared with the light incident from the vertical direction as shown in FIG . When this inclination is different from the desired irradiation range, for example, the shaded portion 18 becomes leaked light.
[0020]
On the other hand, the present invention gradually changes the inclination of each normal line of the lens 2 having the arcuate or substantially triangular irregularities 13 from the center to the periphery as described above, in other words, the convex surface of the lens 2. Leakage light can be reduced by gradually lowering the height from the center to the periphery.
[0021]
In the first embodiment, the projections and depressions 13 are parallel lines in order to expand the irradiation pattern into an oval shape. However, the projections and depressions 13 may be formed concentrically so as to expand the irradiation pattern in a circle.
[0022]
A second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the concavities and convexities 13 are formed concentrically so as to be continuous in the radial direction, and are substantially isosceles triangles as shown in FIG. 8A in the range near the optical axis Q of the reflector 1. and to have a substantially triangular shape having long sides 20 facing the outside of the range to the reflection plate 1 as shown in Figure 8 (c). The short side of the substantially triangular shape is almost vertical or inclined with a draft angle of the mold.
[0023]
More specifically, in the second embodiment, the present invention is applied to a spotlight, the purpose is to expand the diameter of a circular irradiation pattern to a desired circular irradiation pattern, and the concave surface facing the light source 9 of the lens is The concavities and convexities 13 are composed of concentric concavities and convexities centered on a point orthogonal to the optical axis Q, each concavity and convexity 13 has a substantially triangular shape, and light reflected from the reflecting plate 1 is incident substantially parallel to the optical axis Q In the range, it consists of approximately isosceles triangles. For example, when the irradiation range is increased by about 4 degrees as an angle, a substantially isosceles triangle having a low angle with respect to the lens bottom surface of about 9 degrees is used.
[0024]
Further, the long side 20 is formed of a substantially triangular shape facing the reflector 1 from the outside of the range to the opening diameter of the reflector 1 at the lens peripheral end. For example, if the angle formed by the light reflected from the opening of the reflecting plate 1 and the light incident on the lens 2 with respect to the optical axis is 10 degrees, the angle is about 9 degrees with respect to the lens bottom surface. In this case, the oblique side and the long side 20 of the substantially isosceles triangle have the same angle, but since the unevenness 13 is formed on the concave surface of the lens 2, the normal to the incident light incident on the long side 20 is As in the first embodiment, the peripheral portion of the lens 2 gradually approaches the parallel from the inclination with respect to the optical axis Q rather than the central portion.
[0025]
According to this embodiment, when the concavo-convex shape of the lens 2 is substantially the same isosceles triangle shape as a whole, particularly when combined with a wide-angle reflecting plate, it is reflected from the reflecting plate 1 in the vicinity of the peripheral edge of the lens 2. Since the incident light is obliquely incident, as shown in FIG. 8B, an oblique person radiates at one oblique side 27, and the reflectance on the lens surface becomes higher than in the case of FIG. 8A. Therefore, the incidence rate to the lens 2 is increased by making the long side 20 into a substantially triangular shape facing the reflecting plate 1 as shown in FIG. .
[0026]
On the other hand, in the portion where the light substantially parallel to the optical axis Q is incident, the reflectance of light incident on the short side 21 as shown in FIG. Becomes higher. Therefore, the incidence rate can be increased by forming a substantially isosceles triangle at a portion where light substantially parallel to the optical axis Q is incident.
[0027]
In this way, by combining the unevenness 13 with a substantially isosceles triangle shape and a substantially triangular shape, the incidence rate of light incident from the reflector 1 can be increased.
[0028]
The isosceles triangular portion can be formed in an arc shape, and the substantially triangular long side 20 can be formed in an arc shape instead of a plane. The shape of the projections and depressions 13 in this embodiment is not limited to a concentric circle, but can be a parallel line.
[0029]
In the second embodiment, the unevenness 13 is formed on the concave surface, but the unevenness 13 can be formed on a flat surface and applied as a lens for increasing the incidence rate.
[0030]
A third embodiment of the present invention will be described with reference to FIGS. That is, as shown in FIG. 6, the frame 10 is detachably attached to the lamp body 3 by the thumbscrew 11 . Protrusions 24 for guiding the lens 2 to the bottom surface 23 are projected at a plurality of locations near the bottom peripheral surface of the frame 10, for example, approximately three locations, and a groove 15 parallel to the bottom is formed on the surface of the projection 24 facing the center of the frame 10. A plurality of stages, for example, three stages are formed. The distance between the grooves 15 and the distance from the bottom surface 23 are determined by the thickness of the peripheral edge of the lens 2 and the elastic member 25 having a U-shaped ring shape covering the peripheral edge. The groove 15 has a width corresponding to the wire diameter of the spring member 14 which is a fixed ring spring having a chipped ring shape, and allows the spring member 14 to be fitted. The spring member 14 has bent knobs 14a at both ends lacking in a C-shape, and the diameter is reduced by pinching the knobs 14a, the diameter is restored by releasing them, and the diameter is expanded by this restoring action. The spring member 14 is fitted into the groove 15 and supported. On the other hand, the periphery of the lens 2 is protected by an elastic member 25 covering the periphery of the lens 2, for example, rubber . When attaching one lens 2, the lens 2 with the elastic member 25 is placed on the bottom surface 23 of the frame 10, the spring member 14 is placed on the elastic member 25 while being pinched, and the hand is released from the knob portion 14 a to release the spring member 14. Is fitted into the groove 15 and fixed. When two lenses 2 are stacked and three lenses 2 are stacked, the spring member 14 is engaged from the bottom surface 23 to the second-stage groove 15 or the third-stage groove 15.
[0031]
According to this embodiment, the lens 2 can be easily attached and detached by elastically enlarging and reducing the spring member 14. In addition, since the plurality of lenses 2 can be fixed by one spring member 14, the structure can be simplified. Further, the replacement is facilitated as compared with the case where the plurality of lenses 2 are fixed by an independent fixing method.
[0032]
【The invention's effect】
According to the lighting apparatus of the first aspect, since the inclination of the normal line of the convex lens near the opening end away from the optical axis of the reflecting plate is smaller than that near the optical axis, the light beam near the opening end of the reflecting plate is reduced. Even if the inclination with respect to the optical axis is large, it is possible to reduce the light irradiated to unnecessary parts compared to the conventional case, thereby reducing the light that goes outside the target irradiation pattern and obtaining an irradiation pattern with high uniformity. it can.
[0033]
According to the lighting apparatus of claim 2, in addition to the effect similar to that of claim 1, the oblique incident light from the vicinity of the opening end of the reflecting plate is incident on the substantially triangular long piece of the lens, so that it has a substantially isosceles triangular shape. As compared with the above, the reflectance is lowered, and the incidence rate of light incident on the lens can be increased.
[0034]
According to the luminaire of claim 3, in addition to the same effect as that of claim 1 or 2, the lens can be attached and detached by elastically expanding and contracting the diameter of the spring member, so that the structure is simple and assembled. It is easy, and at the same time, a plurality of lenses can be fixed by a single spring member, and exchange is easier than in the case where a plurality of lenses are fixed by an independent fixing method.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram of a first embodiment of the present invention.
2A is an explanatory diagram showing an optical path where a light beam enters the lens substantially parallel to the optical axis, and FIG. 2B is an explanatory diagram showing an optical path where the light beam enters the lens obliquely with respect to the optical axis.
3A is a plan view of a lens, and FIG. 3B is a front view thereof.
4 is a partially enlarged view of FIG. 3;
FIG. 5 is a front view of a lighting fixture.
FIG. 6 is a partially broken side view thereof.
7A is a plan view of a lens according to a second embodiment, FIG. 7B is a sectional view thereof, and FIG. 7C is a partially enlarged view thereof.
FIGS. 8A and 8B are explanatory diagrams in the case of incidence parallel to the optical axis when the lens is convex in an isosceles triangle, FIG. 8B is an explanatory diagram in the case of oblique incidence, and FIG. (C) is an explanatory view in the case of oblique incidence.
FIG. 9 is an exploded side view for explaining a lens fixing configuration according to a third embodiment;
FIG. 10 is a half-sectional side view for explaining a case where three lenses are fixed.
FIGS. 11A and 11B are explanatory diagrams of incidence of a conventional narrow-angle light distribution reflector on a lens, and FIG. 11B are explanatory diagrams of incidence of a wide-angle light distribution reflector on a lens.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reflector 2 Lens 3 Lamp 9 Light source 10 Frame 13 Concavity and convexity 14 Spring member 25 Elastic member

Claims (3)

A reflection plate having a light source disposed therein, and a lens disposed in an opening of the reflection plate;
The reflection plate is bullet-shaped and has a reflected light parallel to the optical axis near the optical axis, and is a wide-angle light distribution type in which the reflected light near the opening end is inclined with respect to the optical axis.
The lens has a plurality of irregularities formed on the surface in parallel lines or concentric circles to change the irradiation pattern, and transmitted light by reflected light in the vicinity of the opening end inclined with respect to the optical axis is applied to the lens. In order to reduce leakage outside the pattern, the concave and convex portions have an angle formed by a normal line of the concave and convex surface with respect to incident light that is incident on the lens after being reflected from the light source by the light source and the optical axis of the reflective plate. The lighting fixture is formed so as to be large at the center of the lens and small as it approaches the periphery from the center of the lens. The irregularities, the a substantially isosceles triangle in the range near the optical axis of the reflector, there is to be substantially triangular shape having long sides facing the outside of the range to the reflecting plate, the substantially triangular The lighting fixture according to claim 1, wherein the lighting device has the long side and the short side with respect to the bottom side, the long side is gently inclined, and the short side is vertical or steeply inclined . The reflector is disposed in the lamp body, the lens is mounted on a bottom surface in a frame that can be fixed to the opening of the lamp body, and a spring member in the shape of a ring that presses and fixes the periphery of the lens to the bottom surface. The lighting device according to claim 1, further comprising: a groove provided in the frame that is engaged when the spring member elastically expands in a state where the lens is held by the spring member.

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