JP2020053144A - Lens and lighting device - Google Patents

Abstract

To provide a lens that can increase a degree of freedom in controlling light distribution, and to provide a lighting device.SOLUTION: A lens includes a barrel part and a bottom part. The barrel part has an inner surface that constitutes an emission surface and an outer surface that constitutes a reflection surface. The bottom part closes one end of the barrel part, is formed with an incidence surface at one of the first end surface in an axial direction of the barrel part, and constitutes an emission surface at the other of the second end surface facing the inner surface in the axial direction of the barrel part.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to, for example, a lens used for a lighting device and a lighting device.

  2. Description of the Related Art An illumination device including a lens that controls light distribution and emits light from a light source is known. This type of lens is arranged to face the light source, and has an incident surface on which light from the light source is incident, an exit surface for emitting light, and a reflecting surface for reflecting light from the incident surface to the exit surface side. It has been known.

JP 2014-120296 A

  The problem to be solved by the present invention is to provide a lens and a lighting device capable of improving the degree of freedom of light distribution control.

  According to an embodiment, a lens includes a body and a bottom. The body has an inner surface formed as an emission surface and an outer surface formed as a reflection surface. The bottom portion closes one end of the body portion, an incident surface is formed on one first end surface in the axial direction of the body portion, and the other face in the axial direction of the body portion and faces the inner surface. The end face of No. 2 is configured as an emission surface.

  The present invention can be expected to provide a lens and a lighting device capable of improving the degree of freedom of light distribution control.

FIG. 1 is a perspective view illustrating a configuration of the lighting device according to the first embodiment. FIG. 2 is a perspective view illustrating a configuration of a main part of the lighting device according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a configuration of a lens used in the illumination device according to the first embodiment. FIG. 4 is a cross-sectional view illustrating a configuration of a lens used in the lighting device according to the second embodiment. FIG. 5 is a cross-sectional view illustrating a configuration of a lens used in the lighting device according to the third embodiment.

  The lenses 30, 30A, and 30B according to the embodiments described below have a body 40 in which an inner surface is configured as a first emission surface 42 and an outer surface is configured as a reflection surface 41, and one end of the body 40 is closed. An incident surface 52 is formed on one first end surface 51 in the axial direction of the body 40, and a second end surface facing the first emission surface 42 on the other side in the axial direction of the body 40 is a third surface. And the bottom 50 formed on the emission surfaces 54, 54A, 54B.

  The first emission surface 42 of the body 40 includes a plurality of different diameter portions 43. The plurality of different-diameter portions 43 have different inner diameters, and the inner diameter of one of the two different-diameter portions 43 adjacent to each other in the axial direction of the body 40 is larger than one inner diameter on the bottom portion 50 side. Have.

  The plurality of different-diameter portions 43 include a first surface 44 configured as a plane orthogonal to the axial direction of the body portion 40 and a second surface that is continuous with the first surface 44 and extends along the axial direction of the body portion 40. 45.

The third emission surface 54 is configured as a plane orthogonal to the axial direction. The third emission surfaces 54A and 54B are configured as lens surfaces. The illumination device 10 includes a light source module 25, lenses 30, 30A, 30B. The lenses 30, 30 </ b> A, and 30 </ b> B have an inner surface formed on the first emission surface 42, an outer surface formed on the reflecting surface 41, and a body 40 closed at one end. An incident surface 52 is formed on one first end surface 51, and a second end surface facing the first emission surface 42 of the body 40 on the other side in the axial direction of the body 40 is a third emission surface. It has a bottom 50 configured on the surface 54.

(First embodiment)
A lighting device 10 according to a first embodiment will be described with reference to FIG.
FIG. 1 is a perspective view illustrating a configuration of the lighting device 10.
FIG. 2 is a perspective view illustrating a configuration of a main part of the lighting device 10. FIG. 2 shows the configuration of the illumination device 10 from which the reflection plate 60 has been removed.
FIG. 3 is a cross-sectional view illustrating a configuration of the lens 30 used in the illumination device 10.
As shown in FIGS. 1 and 2, the lighting device 10 includes a lamp body 20, a power supply device 80, and a connection unit 90 that connects the lamp body 20 and the power supply device 80. The lighting device 10 is, for example, a downlight installed on a ceiling of a building.

  The lamp body 20 includes a light source module 25, a lens 30, a reflector 60, and a radiator 70.

  The light source module (light source) 25 includes a substrate 26 and a light emitting unit 27 mounted on the substrate 26. The light emitting unit 27 includes a plurality of semiconductor light emitting elements (not shown) such as an LED (light emitting diode).

  The lens 30 is arranged to face the light source module 25. As illustrated in FIG. 3, the lens 30 includes a body 40 and a bottom 50 that closes one end of the body 40. The lens 30 controls the light distribution of the light from the light source module 25 and emits the light to the reflection plate 60 side. The lens 30 is formed of a material that can transmit light, and is formed of, for example, a transparent resin material.

  The outer peripheral surface of the body 40 is configured as a reflecting surface 41 that can reflect light from an incident surface 52 described later toward a first emission surface 42 described later. The reflecting surface 41 includes an incident surface 52 and an outgoing surface (including a first outgoing surface 42, a second outgoing surface 46, and a third outgoing surface 54, which will be described later) among the outer surfaces of the lens 30. ). The reflecting surface 41 has a power to convert light from the incident surface 52 into parallel light parallel to the axial direction of the body 40. The reflection surface 41 is configured as, for example, a paraboloid of revolution. The reflection surface 41 is not limited to a paraboloid of revolution.

  The inner peripheral surface of the body 40 is configured as a first emission surface 42. Further, the first emission surface 42 has a plurality of different diameter portions 43. The plurality of different diameter portions 43 have different inner diameters. Further, the plurality of different diameter portions 43 has a configuration in which one inner diameter on the bottom 50 side of two different diameter portions 43 adjacent in the axial direction of the body portion 40 is larger than the other inner diameter.

  Further, each of the plurality of different diameter portions 43 has a first surface 44 that is an axial end surface of the body portion 40 and a second surface 45 that is continuous with the first end surface. Note that, of the plurality of different diameter portions 43, the different diameter portion 43 disposed at one end on the bottom portion 50 side does not have the first surface 44 but has only the second surface 45. This is because the different diameter portion 43 arranged at one end on the side of the bottom portion 50 among the plurality of different diameter portions 43 is configured to be closed by the bottom portion 50.

The first surface 44 is configured as, for example, a plane orthogonal to the axial direction of the body 40. The second surface 45 is, for example, a cylindrical surface parallel to the axial direction of the body 40.
The end face of the body 40 is configured as a second emission surface 46.

  The bottom 50 closes one end of the body 40. An incident surface 52 is formed on one first end surface 51 of the bottom portion 50 in the axial direction of the body portion 40. The incident surface 52 is disposed at a position facing the light source module 25 in the axial direction of the body 40. Light from the light source module 25 is incident on the incident surface 52. The incident surface 52 is a lens surface having a power to refract a part of the light from the light source module 25 toward the reflection surface 41. The incident surface 52 is, for example, a concave lens that is concave toward the opposite side of the light source module 25 in the axial direction of the body 40.

  The other second end surface of the bottom portion 50 in the axial direction of the body portion 40 is configured as a third emission surface 54. The third emission surface 54 constitutes an end face of the different diameter portion 43 arranged at one end on the light source module 25 side among the plurality of different diameter portions 43. The third emission surface 54 is formed on a plane orthogonal to the axial direction of the body 40. The third emission surface 54 is arranged on the incident surface 52 side with respect to, for example, an intermediate position between both ends of the lens 30 in the axial direction.

  The lens 30 configured as described above is formed by, for example, injection molding. In addition, after the lens 30 is formed into a rough appearance by injection molding, the incidence surface 52 and the emission surfaces 42 and 54 may be formed by performing cutting or polishing.

  That is, the second surface 45 of the different diameter portion 43 is preferably formed as a truncated conical surface that is inclined with respect to the axial direction of the body portion 40 in view of die cutting. For this reason, the second surface 45 may be formed into a cylindrical surface parallel to the axial direction of the body portion 40 by performing cutting or polishing after die cutting.

  The thickness of the body 40, in other words, the distance from the reflection surface 41 to the first emission surface 42 in the direction orthogonal to the axial direction of the body 40, when the lens 30 is manufactured by injection molding, The thickness is set so that the density of the material constituting the lens 30 in the mold used for the manufacturing does not become partially uneven.

As shown in FIG. 1, the reflection plate 60 is arranged at a position facing the lens 30 in the axial direction of the body 40. The reflection plate 60 is formed in a tubular shape.
The radiator 70 is thermally connected to the substrate 26 of the light source module 25.
The power supply device 80 is electrically connected to the substrate 26 of the light source module 25 and supplies power to the light source module 25.
The connection section 90 fixes the lamp body 20 to the power supply device 80.

  The lens 30 configured as described above has a body 40, and the inner peripheral surface of the body 40 is configured as a first emission surface 42. As a result, the lens 30 has a configuration in which the body 40 is not provided, that is, the lens 30 has a structure in which the resin is filled in the body 40, and only the end surface facing the incident surface 52 in the axial direction is the emission surface. Compared with a lens having a structure, it can have a plurality of optical control surfaces, so that the degree of freedom of light distribution control is improved.

  In the present embodiment, the lens 30 emits light that is reflected by the reflection surface 41 and is parallel to the axial direction of the body 40 toward the first emission surface 42 and the second emission surface 46 as it is. The first surface 44 of each of the plurality of different-diameter portions 43 of the body 40 is formed as a plane orthogonal to the axial direction, and the second surface 45 is formed so as to emit parallel light parallel to the axial direction. Is formed on a cylindrical surface parallel to the axial direction of the body 40.

  Further, the first emission surface 42 has a plurality of different diameter portions 43. Therefore, the shape of the first emission surface 42 can be changed for each different-diameter portion 43 from a planar shape orthogonal to the axial direction of the body 40.

  Furthermore, since the first emission surface 42 has a configuration including a plurality of different diameter portions 43, the thickness of the lens 30 through which light is transmitted can be reduced, so that light loss caused by transmission through the lens 30 can be reduced. , Can be smaller.

  Furthermore, since the thickness of the lens 30 can be reduced, it is possible to prevent a difference in material density from being partially generated in a mold used for the manufacturing when the lens 30 is molded by injection molding. For this reason, it is possible to prevent the performance of the lens 30 from lowering.

(Second embodiment)
Next, a lens 30A of the illumination device according to the second embodiment will be described with reference to FIG. The configuration of the illumination device of the present embodiment other than the lens 30A may be the same as that of the first embodiment. Therefore, in the present embodiment, only the configuration of the lens 30A will be described, and the description of the other configurations will be omitted. In the lens 30A, components having the same functions as those of the lens 30 of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

FIG. 4 is a sectional view showing the configuration of the lens 30A.
As shown in FIG. 4, the lens 30A includes a body 40, and a bottom 50A that closes one end of the body 40.

  The bottom portion 50A has an incident surface 52A formed on one first end surface 51 in the axial direction of the body portion 40, a third emission surface 54A serving as the other second end surface in the axial direction of the body portion 40, have. The entrance surface 52A is configured as a concave surface that is concave toward the third exit surface 54A. Light from the light source module 25 enters the incident surface 52A. The incident surface 52A has a first incident surface 55 and a second incident surface 56.

The first incident surface 55 is a peripheral surface of the incident surface 52 </ b> A, and is a lens surface having a power to refract light and travel toward the reflection surface 41. The first incident surface 55 is formed in, for example, a truncated cone shape.
The second incident surface 56 is a bottom surface of the incident surface 52A, and is a lens surface having a power for converting light from the light source module 25 into light parallel to the axial direction of the body 40 and directing the light to the third exit surface 54A. is there. The second incident surface 56 is, for example, a convex lens protruding on the opposite side of the light source module 25.

  The third emission surface 54A closes the different diameter portion 43 arranged at one end on the incident surface 52A side among the plurality of different diameter portions 43. The third exit surface 54A is disposed on the incident surface 52A side with respect to an intermediate position between both ends in the axial direction of the lens 30A. It is a lens surface having power to diverge light from the second incident surface 56. The third emission surface 54A is, for example, a convex lens that protrudes in the axial direction of the body 40 toward the opposite side to the incidence surface 52A.

  According to the lens 30A configured as described above, the same effects as in the first embodiment can be obtained.

  Further, in the present embodiment, light emitted from the third emission surface 54A is divergent light, and light emitted from the first emission surface 42 and the second emission surface 46 is parallel to the axial direction of the body 40. It becomes parallel light. As described above, the light distribution can be controlled by forming the shape of a part of the emission surface, in this embodiment, the third emission surface 54A into a shape that allows desired emission light.

(Third embodiment)
Next, a lens 30B of the illumination device according to the third embodiment will be described with reference to FIG. The configuration of the illumination device of the present embodiment other than the lens 30 </ b> B may be the same as that of the second embodiment. For this reason, in the present embodiment, only the configuration of the lens 30B will be described, and the description of the other configurations will be omitted. In the lens 30B, components having the same functions as those of the lens 30A of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and description thereof is omitted.

FIG. 5 is a cross-sectional view illustrating the configuration of the lens 30B.
As shown in FIG. 5, the lens 30B includes a body 40 and a bottom 50B that closes one end of the body 40.

  The bottom portion 50B has an incident surface 52A formed on one first end surface 51 in the axial direction of the body portion 40, a third emission surface 54B serving as the other second end surface in the axial direction of the body portion 40, have.

  The third emission surface 54B closes the different diameter portion 43 arranged at one end on the incident surface 52A side among the plurality of different diameter portions 43. The third emission surface 54B is arranged on the incident surface 52A side from an intermediate position between both ends in the axial direction of the lens 30B. The third emission surface 54B is a lens surface having a power that converges light from the second incidence surface 56. The third emission surface 54B is, for example, a convex lens that protrudes in the axial direction of the body 40 on the opposite side to the incident surface 52A.

  According to the lens 30B configured as described above, the same effect as in the second embodiment can be obtained.

  According to at least one embodiment described above, a lens that can improve the degree of freedom of light distribution control can be provided.

  In the above-described embodiment, an example has been described in which the first surface 44 of the different diameter portion 43 is configured to be a plane orthogonal to the axial direction of the body portion 40, but is not limited thereto. The first surface 44 of the different diameter portion 43 is configured according to desired light distribution control.

  Further, in the above-described embodiment, an example has been described in which the second surface 45 of the different diameter portion 43 is configured to be a cylindrical surface parallel to the axial direction of the body portion 40, but is not limited thereto. The second surface 45 of the different-diameter portion 43 may be configured in accordance with desired light distribution control. For example, in the axial direction of the body 40, the diameter of the second surface 45 increases toward the opening side of the body 40. It may be configured on a surface.

  While certain embodiments of the invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

  DESCRIPTION OF SYMBOLS 10 ... Lighting device, 25 ... Light source module (light source), 30 ... Lens, 30A ... Lens, 30B ... Lens, 40 ... Body part, 41 ... Reflection surface, 42 ... First emission surface, 43 ... Different diameter part, 44 .. A first surface, 45 a second surface, 50 a bottom, 50A a bottom, 50B a bottom, 51 a first end surface, 52 a light incident surface, 52A a light incident surface, 54 a third light exit surface, 54A: third emission surface, 54B: third emission surface, 55: first incidence surface, 56: second incidence surface.

Claims (6)

A body having an inner surface formed as an emission surface and an outer surface formed as a reflection surface;
One end of the body is closed, an entrance surface is formed on one first end surface in the axial direction of the body, and a second end surface facing the inner surface is the other in the axial direction of the body. A bottom configured on the exit surface;
A lens comprising: The inner surface of the trunk portion includes a plurality of different diameter portions,
The plurality of different-diameter portions each have a different inner diameter, and one of the two different-diameter portions adjacent to each other in the axial direction has a configuration in which the other inner diameter is larger than one inner diameter on the bottom side. Item 2. The lens according to item 1.   The plurality of different-diameter portions include a first surface configured as a plane orthogonal to the axial direction, and a second surface continuous with the first surface and along the axial direction. 3. The lens according to 2. The lens according to claim 3, wherein the second end surface is configured as a plane orthogonal to the axial direction. The lens according to claim 3, wherein the second end surface is configured as a lens surface. A light source;
An inner surface is configured as an emission surface, an outer surface is configured as a reflective surface, and one end of the body is closed, and an incident surface is formed on one first end surface in the axial direction of the body, and A lens having a bottom having a second end surface facing the inner surface which is the other end in the axial direction of the body portion and which is configured as an emission surface;
A lighting device comprising: