JP2020161445A - Front lighting device - Google Patents

Abstract

To provide a front lighting device capable of increasing an amount of lower side light.SOLUTION: A floodlight 1 comprises a lens 92 that radiates the light emitted from a light source forward. The lens 92 comprises: a first lens part 92a that focuses the lens emitted by the light source, and emits it forward; and a second lens part 92b that is provided in front of the first lens part 92a, and is composed of a refractive part 92b2 that refracts the light emitted from above the first lens part 92a diagonally downward, and a non-refractive part 92b1 that does not refract the light emitted from below the first lens part 92a.SELECTED DRAWING: Figure 7

Description

The present invention relates to a lighting device that illuminates the front of, for example, a floodlight or a headlight of a vehicle.

For example, in a lighting device that illuminates the front such as a floodlight, it is required to irradiate an irradiation target located at a certain distance in front of the light source with light of a required brightness within a predetermined irradiation range.

Light emitted outdoors by a lighting device such as a floodlight at a position away from the light source may be diffused beyond a predetermined irradiation range. Therefore, the diffusion of light is suppressed by providing a louver to block light (see, for example, Patent Document 1).

JP-A-2017-69025

Here, there is a demand for a floodlight used for a specific application, a headlight of a vehicle, or the like to increase the amount of light on the lower side while suppressing the light on the upper side. In this case, simply providing the louver can suppress the light on the upper side, but cannot increase the amount of light on the lower side.

Therefore, an object of the present invention is to provide a front illuminating device capable of increasing the amount of light on the lower side.

The invention according to claim 1, which has been made to solve the above problems, is a front illuminating device including a lens that irradiates light emitted from a light source forward, and the lens is the light emitted from the light source. The light emitted from either the upper side or the lower side of the first lens unit, which is provided in front of the first lens unit and the first lens unit that collects the light and emits the light forward, is obliquely downwardly refracted. A second lens portion composed of a refracting portion for emitting light and a non-reflecting portion for emitting light emitted from either the upper side or the lower side of the first lens portion without refracting the light. It is a front lighting device characterized by being equipped with.

The invention according to claim 2 is the invention according to claim 1, wherein the refracting portion is configured to increase in thickness from above to below, and is an inclined surface with respect to the non-refracting portion. It is characterized in that it forms.

The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the lens is formed in an array formed by connecting a plurality of lenses.

The invention according to claim 4 includes the light source and the housing for accommodating the lens in the invention according to any one of claims 1 to 3, and the lens is the housing in front view. It is characterized by being provided on the underside of the body.

The invention according to claim 5 includes a louver that limits the upward diffusion of light emitted from the lens in the invention according to any one of claims 1 to 4. It is characterized by.

The invention according to claim 6 is characterized in that, in the invention according to claim 5, at least the top surface portion of the louver has a light-shielding function.

According to the present invention, since the lens includes a first lens portion and a second lens portion, and the second lens portion is composed of a refracting portion and a non-refracting portion, a part of the focused light is exposed. It can be emitted toward the side. Therefore, the amount of light on the lower side can be increased. Further, since the amount of light on the lower side is increased at the refracting portion, the light diffused upward can be reduced by that amount, and the light pollution caused by the light on the upper side can be suppressed.

It is a perspective view of the floodlight according to one Embodiment of this invention. It is an exploded perspective view of the floodlight shown in FIG. It is a perspective view of the lens array shown in FIG. It is a schematic block diagram of the lens which constitutes the lens array shown in FIG. It is a perspective view of the lens array shown in FIG. It is a schematic block diagram of the lens which constitutes the lens array shown in FIG. It is explanatory drawing of the example of the optical path of the light emitted from the light source in the lens shown in FIG. It is a perspective view of the floodlight provided with a louver. It is a perspective view of the louver alone shown in FIG. It is a perspective view which shows the other structural example of a louver.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 10. FIG. 1 is a perspective view of a floodlight as a front lighting device according to an embodiment of the present invention. Further, FIG. 2 is an exploded perspective view of the floodlight 1 shown in FIG. Here, the arrow X direction in FIG. 1 is referred to as a width direction, the arrow Y direction is referred to as a depth direction, and the arrow Z direction is referred to as a height direction. In FIG. 1, the direction of the arrow Y is forward.

The floodlight 1 shown in FIG. 1 is used, for example, at a wharf, a ground, or the like, and the height direction described above is the vertical direction (top-bottom direction) in the installed state. Even when the floodlight 1 is tilted with respect to the vertical direction, the handle 71, which will be described later, is installed so as to be on the upper side. That is, the front illuminating device is a device whose function is not to illuminate the surroundings of the illuminating device but to mainly illuminate the direction in front of the front illuminating device. The floodlight 1 shown in FIG. 1 includes a main body 2, a light source unit 3, a wiring cover 4, and a front lens 5.

As shown in FIG. 2, the main body 2 includes a guard member 6, a housing 7, and a mounting arm 21 (see FIG. 1). The housing 7 is formed in a bottomed tubular shape with an open front surface, and houses the light source unit 3 and the wiring cover 4. Further, a handle 71 is formed on the housing 7.

The guard member 6 is a member that is attached to the back surface of the housing 7 and covers and protects a component member that projects rearward from the back surface of the housing 7. As shown in FIGS. 1 and 2, the guard member 6 is formed in a cage shape by bending a metal plate having a large number of through holes formed into a rectangular parallelepiped shape, and has sufficient rigidity to withstand an external collision. Ensures good breathability. By allowing outside air to flow through the guard member 6, the constituent members inside the guard member 6 can be air-cooled.

The mounting arm 21 is a mounting member that fixes the floodlight 1 to the mounting surface, and rotatably supports the main body 2.

The light source unit 3 includes a first array unit 8 and a second array unit 9. The first array unit 8 includes a lens array 81 (see FIG. 3) and an LED substrate (not shown). As shown in FIGS. 1 and 2, the first array unit 8 is provided on the upper side of the housing 7 in front view (viewed from the front lens 5 side), and the second array unit 9 is a housing in front view. It is provided on the lower side of the body 7. In the present embodiment, the light source unit 3 has a two-stage configuration of the first array unit 8 and the second array unit, but may have three stages, four stages, or the like. In that case, in order to increase the amount of light going downward while ensuring the amount of light in the central portion, it is preferable to configure the second array portion 9 so that there is at least one second array portion 9 below the center.

A perspective view of the lens array 81 is shown in FIG. The lens array 81 is configured by arranging the lenses 82 in an array in which a plurality of rows and a plurality of columns are connected. A perspective view of the lens 82 is shown in FIG. As shown in FIG. 4, the lens 82 is formed in a conical shape. In the lens 82, an LED (light emitting diode), which is a light source provided on the LED substrate, is positioned on the side where the apex of the cone-shaped cone is cut off (the side where the circle of the cross section is small). The bottom surface side of the cone-shaped head (the side having a large circle in cross section) is an exit surface 82c from which light is emitted. The lens 82 of the lens array 81 and the LED (light source) of the LED substrate are associated with each other on a one-to-one basis.

Further, the lens 82 has a cylindrical bottomed hole 82a that is recessed from the side where the LED is positioned toward the exit surface 82c, and further has a cylindrical shape that is recessed from the emission surface 82c toward the side where the LED is positioned. A bottomed hole 82b is formed. The bottomed hole 82a and the bottomed hole 82b do not penetrate. These bottomed holes 82a and 82b have a function of condensing the light emitted from the LED and directing it toward the exit surface 82c. Further, in the lens 82, of the light emitted from the LED, the light that is not directed to the exit surface 82c by the bottomed holes 82a and 82b described above is reflected toward the exit surface 82c at the end surface that is the side surface of the head cone. Ru. That is, the lens 82 controls the light so as to collect the light emitted from the light source and emit it forward.

The second array unit 9 includes a lens array 91 (see FIG. 5) and an LED substrate (not shown). A perspective view of the lens array 91 is shown in FIG. The lens array 91 is configured by arranging the lenses 92 in an array in which a plurality of rows and a plurality of columns are connected. A perspective view of the lens 92 is shown in FIG. As shown in FIG. 6, the lens 92 is composed of a first lens portion 92a and a second lens portion 92b.

Like the lens 82, the first lens portion 92a is formed in a conical shape. In the first lens portion 92a, an LED (light emitting diode), which is a light source provided on the LED substrate, is positioned on the side where the apex of the conical cone is cut off (the side where the circle of the cross section is small). The second lens portion 92b is formed so as to overlap the bottom surface side (the side having a large circle in cross section) of the head cone shape. The lens 92 of the lens array 91 and the LED of the LED substrate are associated with each other on a one-to-one basis.

Further, in the first lens portion 92a, a cylindrical bottomed hole 92c that is recessed from the side where the LED is positioned toward the second lens portion 92b is formed, and further, the LED is positioned from the second lens portion 92b side. A cylindrical bottomed hole 92d that is recessed toward the side is formed. The bottomed hole 92c and the bottomed hole 92d do not penetrate. These bottomed holes 92c and 92d have a function of condensing the light emitted from the LED and directing it toward the second lens portion 92b. Further, of the light emitted from the LED, the light that cannot be directed to the second lens portion 92b by the bottomed holes 92c and 92d described above is directed to the second lens portion 92b at the end surface which is the side surface of the head cone. It is reflected toward. That is, the first lens unit 92a controls the light so that the light emitted from the light source is collected and emitted forward.

The second lens portion 92b is formed so as to overlap the first lens portion 92a. That is, the second lens portion 92b is provided in front of the first lens portion 92a when configured as the floodlight 1. The second lens portion 92b is composed of a non-refracting portion 92b1 and a refracting portion 92b2. The non-refracting portion 92b1 occupies the lower half (left side in FIG. 6) of the second lens portion 92b in the height direction (Z direction), and the light controlled by the first lens portion 92a is not refracted as it is and goes to the outside. Exit. The refracting portion 92b2 occupies the upper half (right side in FIG. 6) of the second lens portion 92b in the height direction (Z direction), and refracts the light controlled by the first lens portion 92a diagonally downward in the height direction. Let it exit to the outside.

The refracting portion 92b2 is formed so that the thickness (depth) increases toward the lower side (left side in FIG. 6) in the height direction. Therefore, as shown in FIG. 6, the refracting portion 92b1 forms an inclined surface inclined with respect to the surface of the non-refracting portion 92b1. In the present embodiment, the second lens portion 92b is a prism.

Further, the second lens portion 92b is formed with a through hole 92e that penetrates the bottomed hole 92d of the first lens portion 92a. The through hole 92e collects the light that has reached the second lens portion 92b in the same manner as the bottomed hole 92d.

FIG. 7 shows an example of an optical path of light emitted from a light source passing through the lens 92. FIG. 7 is a side view of the lens 92. In FIG. 7, the light source is indicated by reference numeral L. In FIG. 7, the light emitted from the light source L is collected and reflected toward the second lens portion 92b at the bottomed holes 92c and 92d and the end faces of the first lens portion 92a.

Then, the light that reaches the refracting portion 92b2 located on the upper side of the second lens portion 92b is refracted downward and emitted (arrow A1). On the other hand, the light that reaches the non-refracting portion 92b1 located on the lower side of the second lens portion 92b is emitted as it is without being refracted (arrow A2). The direction of the arrow A2 is the direction of the optical axis of the floodlight 1. That is, as is clear from FIG. 7, the second lens portion 92b is provided in front of the first lens portion 92a. Further, in the second lens portion 92b, the refracting portion 92b2 refracts the light emitted from the upper side of the first lens portion 92a diagonally downward, and the non-refracting portion 92b1 emits the light emitted from the lower side of the first lens portion 92a. Is emitted without refraction.

Since the lens 92 has a refracting portion 92b2 in the second lens portion 92b that emits light, as shown in FIG. 5, when the lens 92 is formed as a lens array 91, it does not have a flat surface like the lens array 81. Instead, the surface becomes uneven.

In the present embodiment, the lens 92 is formed so that the non-refracting portion 92b1 is on the upper side and the refracting portion 92b2 is on the lower side while being housed in the housing 7, but conversely, the non-refracting portion 92b1 is formed. The refracting portion 92b2 may be formed on the lower side so as to be on the upper side. In short, it is sufficient that the refracting portion 92b2 and the non-refracting portion 92b1 are formed side by side, and the refracting portion 92b2 can emit the incident light obliquely downward.

The wiring cover 4 is a cover member that covers the wiring allocated between the first array portions 8 and 8 and between the second array portions 9 and 9 in order to supply electric power from the housing 7 to the LED substrate. Is. The front lens 5 is provided in front of the light source unit 3 and the wiring cover 4, and is fixed by screws or the like. The front lens 5 also has a function of covering and protecting the light source unit 3.

Further, the above-mentioned floodlight 1 may be provided with a louver on the front surface (the surface from which light is emitted). A floodlight 1 provided with a louver is shown in FIG.

The louver 10 shown in FIG. 8 is attached to the housing 7 so that the fin 14 described later is positioned on the front surface of the floodlight 1, that is, the front surface of the front lens 5.

FIG. 9 is a drawing of the louver 10 alone. The louver 10 includes an upper plate 11, side plates 12, 12, a lower plate 13, and a plurality of fins 14.

The louver 10 is formed into a tubular shape by the upper plate 11, the side plates 12, 12, and the lower plate 13. The upper plate 11 constitutes the outer circumference of the cylinder of the louver 10 and serves as a top surface portion. The upper plate 11 also functions as a light-shielding plate, and blocks a part of the light emitted from the floodlight 1 that diffuses upward. That is, it limits the upward diffusion of the light emitted from the floodlight 1.

The side plate 12 constitutes the outer circumference of the cylinder of the louver 10. Further, as shown in FIGS. 8 and 9, the side plate 12 is notched on the lower side. That is, the length of the lower side of the side plate 12 in the depth direction is shorter than that of the upper side. This is so that the lens array 91 does not block the light directed downward. The lower plate 13 constitutes the outer circumference of the cylinder of the louver 10 and is formed in a band shape. The lower plate 13 has a shorter length in the depth direction than the upper plate 11. This is also to prevent the lens array 91 from blocking the light directed downward.

The fin 14 is a plate-shaped member provided inside a cylinder formed by the upper plate 11, the side plates 12, 12, and the lower plate 13, and each of the fins 14 is provided with the plate surfaces parallel to each other in a front view. .. Further, the fins 14 extend parallel to the optical axis of the floodlight 1. The length of the fin 14 in the depth direction is substantially the same as that of the upper plate 11. In this way, the fin 14 functions as a light-shielding plate that blocks the light emitted from the floodlight 1.

Further, the louver 10 shown in FIG. 9 is not provided in the notched portion of the side plate 12. That is, the fin 14 is not provided at a certain position of the lens array 91 (see FIG. 8). This is to prevent the fins 14 from blocking the downward light by the lens array 91. That is, the fin 14 has a light blocking function of light diffused upward together with the upper plate 11. However, depending on the specifications of the floodlight 1, fins 14 may be provided at a part of a certain position of the lens array 91.

FIG. 10 is a modified example of the louver. The louver 10A is mainly used for illuminating the vicinity. The louver 10A shown in FIG. 10 includes an upper plate 11, side plates 12 and 12, a lower plate 13, and one fin 14.

The louver 10A is similar to the louver 10 in that the upper plate 11, the side plates 12, 12, and the lower plate 13 form a tubular shape.

Further, the louver 10A is provided with only one fin 14. The fin 14 is provided in a portion directly above the notch portion of the side plate 12.

Since this louver 10A is for the vicinity, it is assumed that the distance to the illumination target is short at the time of use. Therefore, the number of fins 14 may be small because the light reaches the object to be illuminated before the emitted light spreads. In the example of FIG. 10, the number of fins 14 is one, but two or more may be used. Further, the location of the fin 14 does not have to be directly above the notch. Alternatively, the fins 14 may not be provided. That is, the louver may have at least the upper plate 11 (top surface portion) having a light shielding function upward.

According to the present embodiment, the floodlight 1 includes a lens 92 that irradiates the light emitted from the light source forward. The lens 92 is provided with a first lens portion 92a that collects the lens emitted by the light source and emits it forward, and light emitted from above the first lens portion 92a provided in front of the first lens portion 92a. A second lens portion 92b composed of a refracting portion 92b2 that refracts the light obliquely downward and emits light, and a non-refracting portion 92b1 that emits light emitted from the lower side of the first lens portion 92a without refracting. It has. By doing so, since the second lens portion 92b is composed of the refracting portion 92b2 and the non-refracting portion 92b1, a part of the focused light can be emitted downward. Therefore, the amount of light on the lower side can be increased. Further, since the refracting portion 92b2 increases the amount of light on the lower side, the light diffused upward can be reduced by that amount, and the light pollution caused by the light on the upper side can be suppressed.

Further, since the refracting portion 92b2 is configured to increase in thickness from the upper side to the lower side and forms an inclined surface with respect to the non-refracting portion 92b1, the boundary with the first lens portion 92a is flat. It can be easily molded by a mold.

Further, since the lens 92 is configured as an array-shaped lens array 91 formed in a row of a plurality of rows and a plurality of columns, lenses corresponding to a plurality of light sources can be collectively formed.

Further, since the floodlight 1 includes a housing 7 for accommodating the first array portion 8 and the second array portion 9, the second array portion 9 is provided on the lower side of the housing 7 in a front view, so that it is a floodlight. Of the light emitted from No. 1, it is possible to increase the amount of light going downward while ensuring the amount of light in the central portion.

Further, since the floodlight 1 is attached to the housing 7 and includes a louver 10 that limits the upward diffusion of the light emitted from the lens arrays 81 and 91, it limits the upward diffusion of the light while limiting the diffusion of the light upward. You can increase the amount of light going down.

Further, since the upper plate 11 which is at least the top surface of the louver 10 has a light-shielding function, it is possible to limit the diffusion of light emitted from the floodlight 1 at least upward. Therefore, the light pollution caused by the upper light can be suppressed.

In the above-described embodiment, the floodlight 1 has been described as the front lighting device, but any lighting device that illuminates the front such as a headlight attached to a vehicle may be used.

Further, the present invention is not limited to the above embodiment. That is, those skilled in the art can carry out various modifications according to conventionally known knowledge within a range that does not deviate from the gist of the present invention. As long as the front lighting device of the present invention is still provided by such deformation, it is, of course, included in the category of the present invention.

1 Floodlight (front lighting device)
7 Housing 9 Second array part 10, 10A Louver 11 Top plate (top surface part)
91 Lens array 92 Lens 92a 1st lens part 92b 2nd lens part 92b1 Non-refractive part 92b2 Refractive part

Claims (6)

In a front illuminating device equipped with a lens that irradiates light emitted from a light source forward.
The lens is
A first lens unit that collects the light emitted by the light source and emits it forward.
A refracting portion provided in front of the first lens portion, which refracts light emitted from either the upper side or the lower side of the first lens portion diagonally downward and emits light, and an upper side of the first lens portion. Alternatively, a second lens portion composed of a non-refracting portion that emits light emitted from either one of the lower sides without refraction, and a second lens portion.
A front lighting device characterized by being equipped with. The front lighting device according to claim 1, wherein the refracting portion is configured to increase in thickness from the upper side to the lower side, and forms an inclined surface with respect to the non-refracting portion. The front illuminating device according to claim 1 or 2, wherein a plurality of the lenses are arranged in an array. A housing that houses the light source and the lens is provided.
The front lighting device according to any one of claims 1 to 3, wherein the lens is provided on the lower side of the housing in a front view. The forward lighting device according to any one of claims 1 to 4, further comprising a louver that limits the upward diffusion of light emitted from the lens. The front lighting device according to claim 5, wherein the louver has at least a top surface portion having a light-shielding function.

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