JP6878481B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device.

A lighting device equipped with a cone-shaped mirror surface reflector whose aperture expands from the light source side to the outside is known. Such a lighting device is generally used because it is easy to design and highly efficient.

However, the light emitted directly from the light source without hitting the mirror surface reflector cannot be controlled by the mirror surface reflector, so that it becomes unnecessary light that causes flare and glare, and the quality of lighting deteriorates. It may end up. FIG. 1 is a vertical cross-sectional view for explaining emitted light in a general lighting device 11, and a path of light is drawn on the left half surface. In FIG. 1, a part of the light emitted from the light source 15 on the base 16 is reflected by the inner surface of the reflector 12 to become parallel light, but the light not reflected by the inner surface of the reflector 12 spreads radially from the light source 15 and flares. It causes unnecessary light such as glare.

Therefore, by combining the mirror surface reflector with a lens, it is possible to control the light emitted from the light source that does not hit the mirror surface reflector (see, for example, Patent Documents 1 and 2). FIG. 2 is a vertical cross-sectional view for explaining the emitted light in the illuminating device 11 provided with the lens 13, and the path of the light is drawn on the left half surface. In FIG. 2, a part of the light emitted from the light source 15 on the base 16 is reflected by the reflector 12 to become parallel light. Further, the lens 13 is provided with an effective lens portion except for the outer peripheral portion so as to act on the portion through which the light not reflected by the reflector 12 passes, and converts the light into parallel light by refraction.

Japanese Unexamined Patent Publication No. 2003-272565 Japanese Unexamined Patent Publication No. 2006-134707

However, when a lens is used, a structure for mounting the lens on the mirror surface reflector is required, and such a mounting structure may hinder the reflection of light by the mirror surface reflector and normal light reflection may not be performed. In such a case, dark areas and dark lines are generated in the emitted light, and the quality and performance (efficiency) of the lighting are deteriorated.

The present invention has been made in view of the above, and an object of the present invention is to provide a lighting device capable of improving the quality of lighting.

In order to solve the above-mentioned problems and achieve the object, the lighting device according to one aspect of the present invention includes a light source, a reflector, and a lens. The reflector has a cone-shaped reflecting surface on the inner surface, and the light source is arranged in the opening on the small diameter side. The lens is arranged in the middle portion of the reflector in the optical axis direction, and collects light passing through the central portion . The reflector has first and second reflecting surfaces divided in the optical axis direction with the lens in between, and light incident on a portion of the second reflecting surface near the light source near the lens. And the light incident on the portion of the first reflecting surface near the lens is configured to be reflected in the same direction, and the end portion of the second reflecting surface on the lens side is the first. It is located on the same or outer side of the end of the reflective surface on the lens side when viewed from the optical axis direction.

The lighting device according to one aspect of the present invention can improve the quality of lighting.

FIG. 1 is a vertical cross-sectional view for explaining emitted light in a general lighting device. FIG. 2 is a vertical cross-sectional view for explaining the emitted light in the lighting device provided with the lens. FIG. 3 is an external perspective view (1) of the lighting device according to the embodiment. FIG. 4 is an exploded perspective view (1) showing the components of the lighting device. FIG. 5 is an external perspective view (2) of the lighting device according to the embodiment. FIG. 6 is an exploded perspective view (2) showing the components of the lighting device. FIG. 7 is a cross-sectional view taken along the line AA in FIG. FIG. 8 is a diagram showing a state of light reflected from a light source by the first paraboloid. FIG. 9 is a diagram showing the relationship between the size of the paraboloid and the position of the lens. FIG. 10 is a diagram showing a state of an intersection between the first paraboloid and the lens. FIG. 11 is a diagram showing a second paraboloid. FIG. 12 is a diagram showing a state of light reflection from the light source 5. FIG. 13 is a diagram showing a state of light reflection in the comparative example. FIG. 14 is a vertical sectional view of the lighting device according to another embodiment.

Hereinafter, the lighting device according to the embodiment will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the relationship between the dimensions of each element in the drawing, the ratio of each element, and the like may differ from the reality. Even between drawings, there may be parts with different dimensional relationships and ratios. Further, in principle, the contents described in one embodiment or modification are similarly applied to other embodiments or modifications.

FIG. 3 is an external perspective view of the lighting device 1 according to the embodiment, which is viewed from an obliquely upper position. FIG. 4 is an exploded perspective view showing the components of the lighting device 1, and is from the same viewpoint as in FIG. Further, FIG. 5 is an external perspective view of the illuminating device 1 from an obliquely downward viewpoint, and FIG. 6 is an exploded perspective view showing components of the illuminating device 1 from the same viewpoint as in FIG. FIG. 7 is a cross-sectional view taken along the line AA in FIG.

In FIGS. 3 to 7, the illuminating device 1 includes a first reflector block 2, a lens 3, a second reflector block 4, a light source 5, and a heat sink 6. The lens 3 is sandwiched between the first reflector block 2 and the second reflector block 4. A light source 5 is arranged on the heat sink 6, and the heat sink 6 is connected to the second reflector block 4. The first reflector block 2 and the second reflector block 4 are examples of reflectors. The first reflector block 2 is an example of the first reflector block. The second reflector block 4 is an example of the second reflector block.

The first reflector block 2 has a cone portion 2b in which a cone-shaped reflecting surface 2a is formed on the inner surface, and a cylindrical portion 2c branching from the large diameter side of the cone portion 2b, and has a large diameter of the cone portion 2b. A flange portion 2d is provided on the side. The reflection surface 2a is formed by a paraboloid or an ellipsoid of a predetermined function. Paraboloids and ellipsoids are functions of focal length. In the present embodiment, the focal length of the reflecting surface is appropriately changed. How the function of the reflecting surface 2a is determined will be described later. The reflecting surface 2a is an example of the first reflecting surface.

The flange portion 2d of the first reflector block 2 is provided with a plurality of fixing portions 2e, and the fixing portion 2e is provided with screw holes 2f. The fixing portion 2e and the screw hole 2f are used for attaching the lighting device 1 to another housing or the like (not shown). A plurality of boss portions 2g are provided between the cone portion 2b and the cylindrical portion 2c, and the boss portion 2g is provided with a screw hole 2h. The boss portion 2g and the screw hole 2h are used for attaching the first reflector block 2 to the second reflector block 4 with the lens 3 sandwiched between them. The first reflector block 2 is integrally formed of resin or the like, and the reflecting surface 2a is formed by metal vapor deposition or the like.

The lens 3 is formed of a substantially disk-shaped flat portion 3b provided with a lens portion 3a by a Fresnel lens in the central portion, and a notch portion 3c is provided around the flat portion 3b. The notch portion 3c is provided so as not to interfere with the screw when the lens 3 is sandwiched and fixed between the first reflector block 2 and the second reflector block 4. The lens portion 3a may be, for example, a convex lens instead of the Fresnel lens. The lens 3 is sandwiched between the first reflector block 2 and the second reflector block 4, and is inserted into the screw hole 2h of the boss portion 2g of the first reflector block 2 and the screw hole 4e of the flange portion 4d of the second reflector block 4. It is fixed by the screw 7 through.

The second reflector block 4 includes a cone portion 4b in which a cone-shaped reflecting surface 4a is formed on the inner surface, and a cylindrical portion 4c in which a part of the peripheral surface is cut off, which branches from the large diameter side of the cone portion 4b. A flange portion 4d is provided on the large diameter side of the cone portion 4b. The reflection surface 4a is formed by a paraboloid or an ellipsoid of a predetermined function. How the function of the reflecting surface 4a is determined will be described later. The reflecting surface 4a is an example of the second reflecting surface.

A plurality of screw holes 4e are provided in the flange portion 4d, and the above-mentioned screw 7 is inserted into the screw holes 4e. A plurality of boss portions 4f are provided between the cone portion 4b and the cylindrical portion 4c, and the boss portion 4f is provided with a screw hole 4g. The boss portion 4f and the screw hole 4g are used for attaching the second reflector block 4 to the heat sink 6. The second reflector block 4 is integrally formed of resin or the like, and the reflecting surface 4a is formed by metal vapor deposition or the like.

The light source 5 is a light emitting element such as an LED (Light Emitting Diode) and is fixed on the base 6a of the heat sink 6. The base 6a is provided with a plurality of screw holes 6b, and is fixed to the screw holes 4g of the second reflector block 4 by screws (not shown). The heat sink 6 has a plurality of heat radiating fins 6c. The heat sink 6 is made of an aluminum alloy or the like.

As shown in FIG. 7, which is partially enlarged, the side of the reflection surface 2a of the first reflector block 2 and the reflection surface 4a of the second reflector block 4 sandwiching the lens 3 that is closer to the light source 5. The end portion of the reflection surface 4a on the lens 3 side is located at the same position or outside the end portion of the reflection surface 2a on the lens 3 side when viewed from the optical axis direction. This is to prevent the reflection of light from being hindered by the thick portion that supports the lens 3 and the generation of dark areas and dark lines in the reflected light. Further, the relationship between the reflecting surface 2a and the reflecting surface 4a sandwiching the lens 3 can be expressed as that the reflecting surface 2a is located inside the extrapolated surface of the reflecting surface 4a.

Hereinafter, the size of each part of the first reflector block 2 and the like, the position of the lens 3, and the functions of the reflection surface 2a of the first reflector block 2 and the reflection surface 4a of the second reflector block 4 will be described. The case where a paraboloid is used as the reflection surface will be described, but the same can be applied to an ellipsoidal surface.

Figure 8 is a diagram showing a state of reflection of light from the light source LS of the first paraboloid P _1, the light path is drawn on the right. However. Light source LS corresponds to the light source 5, the parabolic P ₁ corresponding to the first reflecting surface 2a of the reflector block 2. 8, by arranging the light source LS to the focal position of the paraboloid P _1, light irradiated on the paraboloid P ₁ from the light source LS is a parallel light is reflected.

Figure 9 is a graph showing the relationship between the position of the paraboloid P ₁ of the size and the lens LE. The lens LE corresponds to the lens 3. In FIG. 9, assuming that the radius on the large diameter _{side of the paraboloid P 1 is R 1} and the radius on the small diameter side is R ₂ , the end of the portion (lens portion) effective as a lens of the lens LE is the radius on the small diameter side. a line drawn from R ₂ in the optical axis direction and should be located at the intersection of the straight line connecting the end portion of the large diameter side of the light source LS and parabolic P _1. Light which is adapted to the light from the light source LS that is not reflected at the end of the large diameter side of the paraboloid P ₁ as captured by the lens LE, which is reflected by the small diameter side edge portion of the paraboloid P ₁ This is to make the light continuous with the light refracted by the lens LE without generating or overlapping a blank area. Paraboloid P ₁ of L ₁ the height of the optical axis direction of the end portion of the large diameter side of the small-diameter parabolic relative to the end portion of the side P _1, the optical axis direction of the height of the lens LE L ₂ Then, from the geometrical relationship,
L ₁ : L ₂ = R ₁ : R ₂
Than,
L ₂ = L ₁ x R ₂ / R ₁
Will be.

Figure 10 is a diagram showing a state of the intersection of the first paraboloid P ₁ and the lens LE, and the intersection of the enlarged view of the right side, for example, with the top paraboloid P ₁ of the lens LE, nonreflective regions of ΔR between the lower surface and the intersection of the paraboloid P ₁ of the lens LE is generated, which causes the dark portion and the dark line.

Therefore, as shown in the enlarged view on the right side of FIG. 11, a _{new paraboloid P 2} passing through a position below the thickness of the lens LE in the optical axis direction from the intersection _{of the upper surface of the lens LE and the paraboloid P 1} is formed. Introduce. The paraboloid P ₂ corresponds to the reflecting surface 4a of the second reflector block 4. The focal position of the paraboloid P ₂ is the same as the paraboloid P _1, it is necessary to further pass through the ends of the minor axis of the original paraboloid P _1. In general, since a parabola defining the parabolic surface is represented by a quadratic equation, two points should pass through, by being given the focal position, paraboloid P ₂ is uniquely determined. Incidentally, defined previously parabolic P _1, a case has been described in which thereafter alter the parabolic P _2, on the contrary, it defines a paraboloid P ₂ above, varying the paraboloid P ₁ on the basis thereof You may do so. Further, if the spread of light can be tolerated within a certain range, the function of the reflection surface 2a of the first reflector block 2 and the function of the reflection surface 4a of the second reflector block 4 may be matched.

FIG. 12 is a diagram showing the state of light reflection from the light source 5, and the path of light is drawn on the right half surface. Although it is a cross-sectional view, hatching is omitted. In FIG. 12, the lens 3 is sandwiched between the reflecting surface 2a of the first reflector block 2 and the reflecting surface 4a of the second reflector block 4, but is reflected at the end of the reflecting surface 2a on the lens 3 side. There is no blank area between the light and the light reflected by the end of the reflecting surface 4a on the lens 3 side. Therefore, dark areas and dark lines in the irradiation light are eliminated, and the quality of the illumination is improved.

FIG. 13 is a diagram showing a state of light reflection in the comparative example, and a light path is drawn on the right half surface. Although it is a cross-sectional view, hatching is omitted. In FIG. 13, in the lighting device 101 of the comparative example, a flat portion 102b is provided in the middle of the reflecting surface 102a of the reflector block 102, and the end portion of the lens 103 is supported by the flat portion 102b. .. Therefore, the reflecting surface 102a is divided by the flat portion 102b, and a part of the light from the light source 105 is not reflected, so that a dark portion or a dark line is generated. In this regard, in the embodiment shown in FIG. 12, no dark part or dark line is generated.

FIG. 14 is a vertical sectional view of the lighting device 1 according to another embodiment, in which the first reflector block 2 and the second reflector block 4 are integrally formed. Further, a guide groove 2i having an opening in a part of the cylindrical portion 2c is formed at a place where the boundary portion between the first reflector block 2 and the second reflector block 4 is formed, and the lens 3 is formed in the groove 2i from the outside. Is inserted and supported. Other configurations are the same as those in FIGS. 3 to 7.

Further, other optical elements can be provided for both the illuminating device 1 shown in FIGS. 3 to 7 and the illuminating device 1 shown in FIG. As the other optical element, not only a lens for controlling light distribution but also various elements for improving the function of the lighting device 1 such as an optical filter for light diffusion and wavelength limitation can be used.

For example, the first reflector block 2 in FIG. 7 is divided in the optical axis direction, and a structure similar to that supporting the lens 3 is added to the divided portion, so that other optical elements can be supported. Further, in the middle of the first reflector block 2 in FIG. 14, a groove for a guide into which another optical element is inserted, similar to the groove 2i for supporting the lens 3, is added to support the other optical element. Is possible.

That is, the first reflector block 2 has a third reflecting surface having a function different from that of the first reflecting surface, which faces the first reflecting surface with the optical element interposed therebetween, and the optical element of the first reflecting surface. The side end is located on the same side as or outside the optical element side end of the third reflecting surface when viewed from the optical axis direction. As a result, the structure for supporting the optical element does not hinder the reflection, and the deterioration of the quality of the lighting can be prevented.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

As described above, the lighting device according to the embodiment is arranged in a light source, a reflector having a cone-shaped reflecting surface on the inner surface where the light source is arranged in the opening on the small diameter side, and an intermediate portion in the optical axis direction of the reflector. The reflector has first and second reflecting surfaces that are divided in the optical axis direction with the lens in between, and the end of the second reflecting surface on the side closer to the light source on the lens side. Is located on the same side as or outside the end of the first reflecting surface on the lens side when viewed from the optical axis direction. As a result, dark areas and dark lines due to the structure for supporting the lens can be prevented, and the quality of illumination can be improved.

Further, the reflector includes a light source, a reflector having a cone-shaped reflecting surface on the inner surface in which the light source is arranged in the opening on the small diameter side, and a lens arranged in the middle portion in the optical axis direction of the reflector. It has first and second reflecting surfaces that are divided in the optical axis direction with the lens in between, and the first reflecting surface on the side far from the light source is inside the external surface of the second reflecting surface. Is located in. As a result, dark areas and dark lines due to the structure for supporting the lens can be prevented, and the quality of illumination can be improved.

Further, the first and second reflecting surfaces have different functions for representing the reflecting surfaces. As a result, the reflection of light in the divided portion can be adjusted more accurately.

Further, the functions representing the first and second reflecting surfaces have different focal lengths. As a result, the reflection of light in the divided portion can be adjusted more accurately.

Further, the reflector is composed of a first reflector block having a first reflecting surface and a second reflector block having a second reflecting surface, and the lens is composed of a first reflector block and a second reflector block. It is sandwiched between and supported. As a result, the lens can be easily supported by the reflector.

Further, the lens is inserted and supported in a guide groove provided between the first reflecting surface and the second reflecting surface. As a result, the lens can be easily supported by the reflector.

The first reflecting surface and the second reflecting surface are paraboloids or ellipsoids whose focal positions are aligned with the positions of the light sources. This makes it possible to easily perform a design in consideration of light reflection.

Further, the reflector is provided with an optical element arranged in the middle portion on the larger diameter side than the lens of the reflector, and the reflector has a first reflecting surface and a third reflecting surface facing the first reflecting surface with the optical element interposed therebetween. The end of the first reflecting surface on the optical element side is located on the same side as or outside the end of the third reflecting surface on the optical element side when viewed from the optical axis direction. Thereby, the function of the lighting device can be improved.

Moreover, the present invention is not limited by the above-described embodiment. The present invention also includes a configuration in which the above-mentioned constituent elements are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

1 Lighting device, 2 1st reflector block, 2a Reflective surface, 3 Lens, 4 2nd reflector block, 4a Reflective surface, 5 Light source, 6 Heat sink

Claims (9)

Light source and
A reflector having a cone-shaped reflecting surface on the inner surface, in which the light source is arranged in the opening on the small diameter side,
A lens for condensing light passing through the central portion, which is arranged in the middle portion in the optical axis direction of the reflector, is provided.
The reflector has first and second reflecting surfaces that are divided in the optical axis direction with the lens in between.
The light incident on the portion of the second reflecting surface close to the light source near the lens and the light incident on the portion of the first reflecting surface near the lens are reflected in the same direction. Configured
The lens-side end of the second reflective surface is located the same as or outside the lens-side end of the first reflective surface when viewed from the optical axis direction.
Lighting device. Light source and
A reflector having a cone-shaped reflecting surface on the inner surface, in which the light source is arranged in the opening on the small diameter side,
A lens for condensing light passing through the central portion, which is arranged in the middle portion in the optical axis direction of the reflector, is provided.
The reflector has first and second reflecting surfaces formed by a predetermined function, respectively, which are divided in the optical axis direction with the lens in between.
The light incident on the portion of the second reflecting surface close to the light source near the lens and the light incident on the portion of the first reflecting surface near the lens are reflected in the same direction. Configured
If the first reflecting surface is continuous from the end of the first reflecting surface on the lens side to the lens and the side of the second reflecting surface by the predetermined function, the second reflecting surface is formed. Located outside the surface to be formed,
Lighting device. The same direction is parallel to the optical axis direction.
The lighting device according to claim 1 or 2. The first and second reflecting surfaces have different functions representing the reflecting surfaces.
The lighting device according to any one of claims 1 to 3. The functions representing the first and second reflecting surfaces have different focal lengths.
The lighting device according to claim 4. The reflector is composed of a first reflector block having the first reflecting surface and a second reflector block having the second reflecting surface.
The lens is sandwiched and supported by the first reflector block and the second reflector block.
The lighting device according to any one of claims 1 to 5. The lens is inserted and supported in a guide groove provided between the first reflecting surface and the second reflecting surface.
The lighting device according to any one of claims 1 to 5. The first reflecting surface and the second reflecting surface are paraboloids or ellipsoids whose focal positions are aligned with the positions of the light sources.
The lighting device according to any one of claims 1 to 7. An optical element arranged in the middle portion of the reflector on the larger diameter side than the lens is provided.
The reflector has a third reflecting surface that faces the first reflecting surface with the optical element interposed therebetween.
The end of the first reflective surface on the optical element side is located on the same side as or outside the end of the third reflective surface on the optical element side when viewed from the optical axis direction.
The lighting device according to any one of claims 1 to 8.

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