JP2015090776A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture which can suppress a temperature rise of an optical member while securing a favorable light distribution property.SOLUTION: A lighting fixture 1 comprises an LED light source 10, and a lens member 40 arranged so as to oppose the LED light source 10 in an emission front part of light from the LED light source 10. The lens member 40 includes a first external peripheral face 401 being an external peripheral region at a light incident side on which a plurality of concentric annular protrusions with an optical axis of the lens member 40 as a center are formed, a first internal peripheral face 402 being a region at an internal peripheral side of the first external peripheral face 401, a second external peripheral face 411 being an external peripheral region at a light emission side, and opposing the first external peripheral face 401, and a second internal peripheral face 412 being a region at an internal peripheral side of the second external peripheral face 411, and opposing the first internal peripheral face 402. The first internal peripheral face 402 is protruded to a direction which separates from a plane including the LED light source 10 rather than the first external peripheral face 401 with an optical axis as a normal line, and the second internal peripheral face 412 is protruded to a direction which separates from the plane rather than the second external peripheral face 411.

Description

  The present invention relates to a lighting fixture, and more particularly to an embedded lighting fixture that uses a light emitting element such as a light emitting diode (LED) as a light source.

  Conventionally, as embedded lighting fixtures, for example, embedded ceiling lighting fixtures that are embedded in the ceiling and emit light downward, such as downlights and spotlights, or embedded in the ground Underground lighting fixtures that emit light upward are known. As a conventional embedded lighting fixture, for example, Patent Literature 1 discloses a lighting fixture related to a downlight.

  The conventional lighting fixture disclosed in Patent Document 1 includes an LED light source (LED module) and a fixture main body that houses the LED light source. The instrument body has an annular reflection portion disposed between the LED light source and the frame portion, and a frame body portion having an incident port for receiving light from the LED light source and an emission port for emitting light incident from the incident port. A plate, and a translucent panel disposed between the reflector and the frame portion. The reflecting plate is made of aluminum, and is configured to reflect light from the LED light source on the inner peripheral surface and collect it at the entrance of the frame body.

  Patent Document 2 discloses a small-sized light source having a condensing blazed shape on either one of a light incident surface and a light emitting surface with respect to an LED light source having a divergent light distribution characteristic. A light source module is disclosed.

JP 2011-210621 A JP 2011-54829 A

  By applying the light source module disclosed in Patent Document 2 to the conventional embedded lighting apparatus disclosed in Patent Document 1, even in the embedded lighting apparatus, for example, surface-mounted LEDs By the light source and the thin condensing element, it can be thinned in the emission direction. Further, it is considered that the light extraction efficiency from the emission port can be improved and light distribution factors such as a light blocking angle can be improved.

  However, when the light source module is mounted in an embedded lighting fixture, the distance between the light condensing element and the LED light source can be reduced. The temperature rises. Since the light energy is transmitted in proportion to the square of the distance, depending on the arrangement relationship between the LED light source and the condensing element, the temperature of the condensing element exceeds the allowable temperature, and the light extraction efficiency is reduced. It is assumed that

  The present invention has been made to solve such problems, and an object of the present invention is to provide a lighting apparatus capable of reducing the temperature rise of an optical member while ensuring good light distribution. .

  In order to achieve the above object, one aspect of a lighting fixture according to the present invention is a light source, disposed in front of the light source from the light source so as to face the light source, and emits light from the light source in a predetermined direction. An optical member that distributes light, and the optical member is an outer peripheral region on a light incident side, and a first outer peripheral surface on which a plurality of concentric annular protrusions centered on the optical axis of the optical member are formed, A first inner peripheral surface that is an inner peripheral region of the first outer peripheral surface, a second outer peripheral surface that is an outer peripheral region on the light emitting side and faces the first outer peripheral surface, and an inner portion of the second outer peripheral surface A second inner peripheral surface facing the first inner peripheral surface, and the first inner peripheral surface includes the light source with the optical axis as a normal to the first outer peripheral surface. Projecting away from the plane, the second inner peripheral surface protrudes away from the plane than the second outer peripheral surface. And wherein the Rukoto.

  Further, in one aspect of the lighting fixture according to the present invention, the protrusion includes a refracting surface that refracts the emitted light, and a reflection that is formed on an outer peripheral side of the refracting surface and reflects light incident on the protrusion. May have a surface.

  In the aspect of the lighting fixture according to the present invention, the second outer peripheral surface may be flat.

  Moreover, the one aspect | mode of the lighting fixture which concerns on this invention WHEREIN: The said 1st internal peripheral surface and the said 2nd internal peripheral surface are good also as having a spherical shape.

In one aspect of the lighting fixture according to the present invention, the first inner peripheral surface has a spherical shape,
The second inner peripheral surface may include a flat surface.

  Moreover, the one aspect | mode of the lighting fixture which concerns on this invention WHEREIN: The said 1st internal peripheral surface and the said 2nd internal peripheral surface are good also as including a plane.

  Further, in one aspect of the lighting fixture according to the present invention, the first inner peripheral surface has a spherical shape, and an annular protrusion that protrudes away from the plane is formed on the second inner peripheral surface. It may be.

  According to the lighting fixture according to the present invention, it is possible to reduce the temperature rise of the optical member while ensuring good light distribution.

Overview perspective view of lighting apparatus according to an embodiment of the present invention The exploded perspective view of the lighting fixture which concerns on embodiment of this invention Sectional drawing at the time of cut | disconnecting by XZ plane containing the central axis of the lighting fixture which concerns on embodiment of this invention The perspective view which shows an example of the lens member which concerns on embodiment of this invention Three views of a lens member according to an embodiment of the present invention (plan view, front view, and bottom view) Sectional drawing at the time of cut | disconnecting the lens member which concerns on embodiment of this invention in XZ plane containing an optical axis Sectional drawing at the time of cut | disconnecting the lens member which concerns on the modification 1 of embodiment of this invention in the XZ plane containing an optical axis. Sectional drawing at the time of cut | disconnecting the lens member which concerns on the modification 2 of embodiment of this invention in the XZ plane containing an optical axis. Sectional drawing at the time of cut | disconnecting the lens member which concerns on the modification 3 of embodiment of this invention in XZ plane containing an optical axis Sectional view when cutting a conventional lens member along the XZ plane including the optical axis

  Hereinafter, a light bulb shaped lamp and an illumination device according to an embodiment of the present invention will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements. Each figure is a schematic diagram and is not necessarily illustrated exactly. Therefore, there is a portion that does not exactly match in each figure.

(Embodiment)
First, the structure of the lighting fixture which concerns on embodiment of this invention is demonstrated using FIGS. 1-3. FIG. 1 is a schematic perspective view of a lighting apparatus according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lighting fixture according to the embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the XZ plane including the central axis of the lighting fixture according to the embodiment of the present invention.

  The lighting fixture 1 shown in FIG.1 and FIG.2 is used for lighting fixtures, such as a downlight which illuminates light, for example, a spotlight.

  The lighting fixture 1 according to the present embodiment is surrounded by a housing 20 and an auxiliary reflecting member 50 as shown in FIG. 1, and as shown in FIG. 2, the LED light source 10, the housing 20, The reflection member 30, the lens member 40, and the auxiliary reflection member 50 are provided. As illustrated in FIG. 2, the lighting fixture 1 is configured by combining the housing 20, the LED light source 10, the reflecting member 30, the lens member 40, and the auxiliary reflecting member 50 in this order.

  Hereinafter, each component in the lighting fixture 1 is demonstrated in detail.

[LED light source]
The LED light source 10 is a light emitting module having a light emitting element, and emits predetermined light radially. The LED light source 10 is configured to emit white light, and includes a substrate 11, a plurality of LEDs (bare chips) 12 mounted on the substrate 11, and a sealing member 13 that seals the LEDs 12. Light source. In the present embodiment, the optical axis of the LED light source 10 is in the vertical direction.

  The substrate 11 is a mounting substrate for mounting the LED 12, and is, for example, a resin substrate, a ceramic substrate, a metal base substrate with an insulating coating, or the like. Moreover, as the board | substrate 11, the plate-shaped board | substrate which has a plane which is a rectangular shape in planar view can be used, for example. The substrate 11 is fixed between the fixing member inside the housing 20 and the reflecting member 30. Thereby, the heat generated by the LED 12 is conducted to the housing 20 through the substrate 11. In order to efficiently conduct the heat generated by the LED 12 to the housing 20, it is preferable to use a substrate or a metal base substrate in which a metal material is formed on the surface to be in close contact with the internal member. Although not shown, the substrate 11 is formed with a pair of electrode terminals (a positive electrode terminal and a negative electrode terminal) for receiving DC power for causing the LED 12 to emit light from the outside. The LED light source 10 emits predetermined light by electric power supplied from a power supply unit (not shown) outside the lighting fixture 1.

  The LED 12 is an example of a light emitting element, and is a bare chip that emits monochromatic visible light. The LED 12 in the present embodiment is a blue light emitting LED chip that emits blue light when energized. A plurality of LEDs 12 are arranged in a matrix on one surface (front surface: the lower surface in FIGS. 2 and 3) of the substrate 11. The LEDs 12 are electrically connected to each other by metal wiring (not shown) and wires (not shown) patterned on the substrate 11.

  The sealing member 13 is formed on the substrate 11 so as to collectively seal the plurality of LEDs 12. The sealing member 13 includes a phosphor that is a light wavelength conversion material, and functions as a wavelength conversion layer that converts the wavelength of light from the LED 12. As the sealing member 13, for example, a phosphor-containing resin in which predetermined phosphor particles and a light diffusing material are dispersed in a silicone resin can be used.

  In addition, the magnitude | size of the light-projection surface of the LED light source 10 is 30-40 mm in diameter as an example. The size of the LED light source 10 is not limited to this, and may be, for example, 10 mm in diameter.

  When the LED 12 is a blue light-emitting diode that emits blue light, for example, YAG-based yellow phosphor particles can be used as the phosphor particles in order to obtain white light. As a result, part of the blue light emitted from the LED 12 is converted into yellow light by the yellow phosphor particles contained in the sealing member 13. That is, the yellow phosphor particles are excited by the blue light (excitation light) emitted from the LED 12 and fluoresce yellow light having a complementary color relationship with the blue light. Then, the blue light that has not been absorbed by the yellow phosphor particles and the yellow light that has been wavelength-converted by the yellow phosphor particles are diffused and mixed in the sealing member 13 so that the white light is emitted from the sealing member 13. And emitted. As the light diffusing material, particles such as silica are used.

  In addition, in order to improve color rendering properties, red phosphor particles may be mixed in the sealing member 13 in addition to the yellow phosphor particles. Further, the sealing member 13 is not necessarily formed of a silicone resin, and may be formed of an inorganic material such as a low-melting glass or a sol-gel glass in addition to an organic material such as a fluorine-based resin. Further, the sealing member 13 may collectively seal all the LEDs 12 or may linearly seal each LED 12 row.

[Case]
The housing 20 is a part of the housing that forms the outline of the luminaire 1 and is a mounting base to which the LED light source 10 is attached. The housing 20 is a heat sink that dissipates heat generated by the LED light source 10. The casing 20 is formed in a substantially cylindrical shape using a metal material, and is made of aluminum die casting in the present embodiment.

  The housing 20 includes an internal member for attaching the LED light source 10. In the present embodiment, the internal member sandwiches the LED light source 10 with the reflecting member 30.

  In the present embodiment, the LED light source 10 is in contact with the internal member of the housing 20, but a heat dissipation base (heat sink) is placed on the bottom surface of the internal member, and the LED light source 10 is connected to the heat dissipation base. It may be fixed on the base (lower surface).

  Note that a plurality of heat radiation fins protruding upward may be provided on the upper portion (ceiling side portion) of the housing 20. The radiating fins may be provided, for example, at regular intervals along one direction. Thereby, the heat generated in the LED light source 10 can be efficiently radiated.

[Reflection member]
The reflecting member 30 is a reflecting plate having a reflecting function, and is an incident port that is an opening through which light from the LED light source 10 is incident, and an emitting port that is an opening through which light incident from the incident port is emitted from the reflecting member 30. And have. The reflecting member 30 has an annular frame shape (funnel shape) configured such that the inner diameter gradually increases from the incident port toward the output port. For example, a hard white resin material such as polybutylene terephthalate (PBT) is used. Can be formed. The reflective member using PBT has heat resistance and high reflectance, and further, a flame retardant grade can be selected.

  The inner peripheral surface of the reflecting member 30 is a reflecting surface that reflects light from the LED light source 10. The reflection surface is configured to reflect light incident from the incident port and emit the light from the output port.

  The reflecting member 30 may be formed of a metal material such as aluminum instead of a hard white resin material. Or you may form the metal vapor deposition film (metal reflective film) which consists of metal materials, such as silver and aluminum, as a reflective surface in the inner surface of the reflection member 30 made from resin.

[Auxiliary reflection member]
The auxiliary reflecting member 50 is a part of the casing that forms the outer shell of the lighting fixture 1, and includes a substantially cylindrical cone portion 501 having a reflecting surface on the inner surface, and a frame body portion 502 to which the cone portion 501 is attached. Have. The cone portion 501 is formed using a metal material, and can be manufactured by drawing or press forming an aluminum alloy or the like, for example. The frame main body 502 is formed of a hard resin material or a metal material. The auxiliary reflecting member 50 is fixed by attaching the frame main body 502 to the housing 20.

  In the upper part of the cone part 501, an entrance through which light from the LED light source 10 that has passed through the reflection member 30 directly or reflected is incident is provided. In addition, at the lower part of the cone part 501, an emission port for emitting the light incident on the auxiliary reflecting member 50 to the outside is provided. These entrance and exit are opened in a circular shape, and the exit diameter of the exit is larger than the diameter of the entrance. Moreover, the inner peripheral surface of the cone part 501 is a reflective surface that reflects light, and the reflective surface in the present embodiment is a metal reflective surface. The reflection surface is configured such that light incident from the incident port is reflected by the reflection surface and emitted from the emission port. Note that the angle of light emitted from the emission port can be appropriately adjusted depending on the shape of the reflecting surface. The reflecting surface in the present embodiment is configured such that light incident from the incident port is reflected substantially vertically downward.

  The cone portion 501 is disposed at a predetermined interval in the vertical direction from the reflecting member 30. Further, the opening diameter of the entrance of the cone portion 501 is substantially the same as the opening diameter of the exit of the reflecting member 30 described later.

  A flange protruding outward in the radial direction is integrally formed in the lower end portion of the frame body portion 502 in the circumferential direction.

  The luminaire 1 according to the present embodiment may be configured not to include the auxiliary reflecting member 50. By providing the auxiliary reflecting member 50 as shown in the present embodiment, a part of the light emitted from the lens member 40 in the lighting fixture 1 is further reflected by the auxiliary reflecting member 50. Thereby, since light distribution control can be performed even after the light emitted from the LED light source 10 has passed through the lens member 40, the light extraction efficiency can be further improved.

[Lens material]
Next, the lens member 40 will be described. As shown in FIG. 3, the lens member 40 is an optical member that is disposed at a position facing the LED light source 10 and distributes light emitted from the LED light source 10 in a predetermined direction. The lens member 40 emits the emitted light incident from the LED light source 10 from the light emitting surface.

  The lens member 40 in the present embodiment is fixed between the exit port of the reflecting member 30 and the entrance port of the auxiliary reflecting member 50, and receives the light from the LED light source 10 incident from the light incident side of the lens member 40. The light is emitted from the light incident side of the lens member 40.

  The lens member 40 is formed using a translucent material. For example, the lens member 40 is formed using a transparent resin material such as PMMA (acrylic) or polycarbonate (PC), or an insulating transparent material such as a glass material. be able to.

  Here, the structure of the lens member 40 will be described in detail with reference to FIGS.

  FIG. 4 is a perspective view showing an example of a lens member according to the embodiment of the present invention. FIG. 5 is a three-view drawing (plan view, front view, and bottom view) of the lens member according to the embodiment of the present invention. FIG. 6 is a cross-sectional view of the lens member according to the embodiment of the present invention when cut along the XZ plane including the optical axis.

  4 and 5, the lens member 40 has concentric and annular protrusions T1 to T4 (centered on the optical axis of the lens member 40 on the light incident side). (T1 is not shown). In the present embodiment, as shown in FIG. 6, the protrusions T <b> 1 to T <b> 4 are formed on the lens member 40 incident side and the outer peripheral region. The protrusions T1 to T4 are respectively reflective surfaces K1 to K4 that refract incident light from the LED light source 10, and reflections that reflect the light incident on the protrusions T1 to T4 formed on the outer peripheral side of the refractive surface. It has surface R1-R4. Moreover, the outer peripheral area | region of the light emission side of the lens member 40 is a flat surface.

  Due to the structure of the lens member 40, as shown in FIG. 6, in the outer peripheral region of the lens member 40, light Lo (light in which the X direction component is dominant over the Z direction component) is incident from the LED light source 10 at a wide angle. The light is refracted and transmitted by the refractive surface K2 of the protrusion T2 in the lens member 40, reflected by the reflective surface R2, and guided to the light emitting surface. On the other hand, in the inner peripheral area of the lens member, light Li (light in which the Z direction component is dominant over the X direction component) incident on the lens member 40 at a depression angle is incident from a flat portion of the light incident surface. The light is refracted and transmitted from the light exit surface in a substantially vertical direction.

  In the lens member 40 according to the present embodiment, the number of concentric and annular protrusions is not limited to four.

  Here, as shown in the front view (center view) of FIG. 5 and FIG. 6, the lens member 40 according to the present embodiment is an outer peripheral region on the light incident side and centered on the optical axis of the lens member 40. The first outer peripheral surface 401 on which the protruding portions T1 to T4 are formed, the first inner peripheral surface 402 that is the inner peripheral side region of the first outer peripheral surface 401, and the outer peripheral region on the light emitting side that is the first outer peripheral surface It includes a second outer peripheral surface 411 facing the surface 401 and a second inner peripheral surface 412 which is an area on the inner peripheral side of the second outer peripheral surface 411 and faces the first inner peripheral surface 402. The first inner peripheral surface 402 protrudes in a direction away from a plane including the LED light source 10 with the optical axis as a normal line than the first outer peripheral surface 401. Further, the second inner peripheral surface 412 protrudes in a direction away from a plane including the LED light source 10 with the optical axis as a normal line, than the second outer peripheral surface 411. In the present embodiment, the plane is a plane including the surface of the substrate 11, for example.

  The temperature of the lens member 40 rises due to light irradiation from the LED light source 10. Light energy from the LED light source 10 is transmitted in proportion to the square of the distance. From this viewpoint, in order to keep the temperature of the lens member 40 below the allowable temperature, it is an important factor to secure the distance between the LED light source 10 and the lens member 40. On the other hand, if the distance between the lens member 40 and the LED light source 10 is ensured, the light directly incident on the lens member 40 from the LED light source 10 (without hitting the reflecting member 30) decreases, resulting in a decrease in light extraction efficiency and light distribution. This leads to a decrease in controllability (ease of light distribution control).

  According to the above configuration of the lens member 40 included in the lighting fixture 1 according to the present embodiment, the first inner peripheral surface 402 and the second inner peripheral surface 412 disposed in the inner peripheral region where the distance from the LED light source 10 is small. Since the optical axis is normal and protrudes away from the plane including the LED light source 10, the temperature rise of the lens member 40 can be effectively reduced. Moreover, the 1st outer peripheral surface 401 and the 2nd outer peripheral surface 411 which are arrange | positioned at the outer peripheral area | region of the lens member 40 are not protruded in the direction away from the said plane. As a result, the light that directly enters the lens member 40 from the LED light source 10 (without hitting the reflecting member 30) does not decrease, so that the light extraction efficiency is reduced and the light distribution controllability (ease of light distribution control) is reduced. The decrease can be suppressed. Therefore, it is possible to reduce the temperature rise of the lens member 40 while ensuring good light distribution.

  The second outer peripheral surface 411 is flat. As a result, light that is refracted and transmitted by the refracting surface of the protrusion in the lens member 40 and reflected by the reflecting surface to reach the second outer peripheral surface 411 is a critical angle (light that is the angle at which the light is totally reflected). Since an incident angle smaller than the angle from the axis is dominant, the light is emitted from the second outer peripheral surface 411 without being totally reflected by the second outer peripheral surface 411. Therefore, it is possible to improve the light extraction efficiency.

  The first inner peripheral surface 402 and the second inner peripheral surface 412 have a spherical shape. The light incident on the inner peripheral region of the lens member 40 refracts and passes through the first inner peripheral surface 402 and the second inner peripheral surface 412 and is emitted mainly in a direction parallel to the optical axis (vertically below). The outer peripheral region of the lens member 40 is a region having a refraction and reflection function, whereas the inner peripheral region of the lens member 40 is a region having a refraction function. Therefore, the light emitted from the second inner peripheral surface 412 greatly affects the characteristics as spot illumination. Since the first inner peripheral surface 402 and the second inner peripheral surface 412 have a spherical shape, it becomes possible to impart diffusibility to the spot light.

  The spherical shape described above is not limited to a true spherical shape having the same curvature radius, and a shape whose curvature radius changes depending on the position is also included in the spherical shape.

  In addition, the lens member which the lighting fixture which concerns on this invention has is not limited to the structure mentioned above. For example, the shape of the inner peripheral surface of the lens member is not limited to the spherical surface. Hereinafter, modified examples of the shape of the inner peripheral surface of the lens member will be described.

[Modification of Embodiment]
FIG. 7A is a cross-sectional view of the lens member according to Modification 1 of the embodiment cut along an XZ plane including the optical axis. The first inner peripheral surface 402 of the lens member 41 shown in the same figure protrudes in a direction away from the plane including the LED light source 10 with the optical axis as a normal line than the first outer peripheral surface 401, and has a spherical shape. Have. On the other hand, the second inner peripheral surface 412 protrudes in a direction away from the plane than the second outer peripheral surface 411, but has a part of a planar shape. Thereby, the light emitted from the second inner peripheral surface 412 can suppress the diffusibility of the spot light as compared with the lens member 40 according to the embodiment.

  FIG. 7B is a cross-sectional view of the lens member according to Modification 2 of the embodiment cut along an XZ plane including the optical axis. The first inner peripheral surface 402 and the second inner peripheral surface 412 of the lens member 42 shown in the figure have an optical axis as a normal line than the first outer peripheral surface 401 and the second outer peripheral surface 411, respectively. 10 protrudes in a direction away from the plane including 10, but partially has a planar shape. Thereby, the light emitted from the second inner peripheral surface 412 can suppress the diffusibility of the spot light as compared with the lens member 40 according to the embodiment and the lens member 41 according to Modification 1. Become.

  FIG. 7C is a cross-sectional view of the lens member according to Modification 3 of the embodiment cut along an XZ plane including the optical axis. The first inner peripheral surface 402 of the lens member 43 shown in the figure protrudes in a direction away from the plane including the LED light source 10 with the optical axis as a normal line, than the first outer peripheral surface 401, and has a spherical shape. Have. The second inner peripheral surface 412 protrudes in a direction away from the plane than the second outer peripheral surface 411, and the second inner peripheral surface 412 has an annular protrusion protruding in the direction away from the plane. Is formed. Thereby, the light emitted from the second inner peripheral surface 412 can control the degree of diffusion of the spot light with high accuracy.

[effect]
The luminaire 1 according to the present embodiment includes an LED light source 10 and a lens member that is disposed in front of the LED light source 10 so as to face the LED light source 10 and distributes light emitted from the LED light source 10 in a predetermined direction. 40. The lens member 40 includes an outer peripheral region on the light incident side and a first outer peripheral surface 401 formed with concentric annular protrusions T1 to T4 centered on the optical axis of the lens member 40, and an inner periphery of the first outer peripheral surface 401. A first inner peripheral surface 402 that is a peripheral region, a second outer peripheral surface 411 that is an outer peripheral region on the light emitting side and faces the first outer peripheral surface 401, and a region on the inner peripheral side of the second outer peripheral surface 411. And a second inner peripheral surface 412 facing the first inner peripheral surface 402. The first inner peripheral surface 402 protrudes in a direction away from the plane including the LED light source 10 with the optical axis as a normal line than the first outer peripheral surface 401, and the second inner peripheral surface 412 is more than the second outer peripheral surface 411. Projecting away from the plane.

  FIG. 7D is a cross-sectional view of a conventional lens member taken along the XZ plane including the optical axis. In the lens member 540 shown in the figure, the first inner peripheral surface does not protrude in the direction away from the plane including the LED light source with the optical axis as the normal line than the first outer peripheral surface. Further, the second inner peripheral surface does not protrude in a direction away from the plane than the second outer peripheral surface.

  With the above configuration, the lens member 40 of the lighting fixture 1 according to the present embodiment can effectively reduce the temperature rise as compared with the conventional lens member 540 shown in FIG. 7D. Moreover, the 1st outer peripheral surface 401 and the 2nd outer peripheral surface 411 which are arrange | positioned at the outer peripheral area | region of the lens member 40 are not protruded in the direction away from the said plane. Thereby, it is possible to suppress the spread of the light shielding angle, which is mainly caused by the light emitted from the outer peripheral region of the lens member 40. Therefore, it is possible to reduce the temperature rise of the lens member 40 while ensuring good light distribution.

  The protrusions T1 to T4 are respectively refracting surfaces K1 to K4 that refract the emitted light, and reflecting surfaces R1 to R4 that are formed on the outer peripheral side of the refracting surface and reflect light incident on the protrusions. You may have.

  As a result, in the outer peripheral region of the lens member 40, the light incident from the LED light source 10 at a wide angle is refracted and transmitted by the refractive surface of the protrusion in the lens member 40, reflected by the reflective surface, and at an incident angle less than the critical angle. It becomes possible to make it enter into a light-projection surface. Therefore, it is possible to improve the light extraction efficiency.

  Further, the second outer peripheral surface 411 may be flat.

  As a result, the light that is refracted and transmitted by the refracting surface of the protrusion in the lens member 40 and reflected by the reflecting surface to reach the second outer peripheral surface 411 is predominantly having an incident angle smaller than the critical angle. The light is emitted from the second outer peripheral surface 411 without being totally reflected by the second outer peripheral surface 411. Therefore, it is possible to improve the light extraction efficiency.

  The first inner peripheral surface 402 and the second inner peripheral surface 412 may have a spherical shape.

  Thereby, it becomes possible to give diffusibility to the spot light radiate | emitted from the lighting fixture 1. FIG.

  The first inner peripheral surface 402 may have a spherical shape, and the second inner peripheral surface 412 may include a flat surface.

  Thereby, compared with the case where the 1st inner peripheral surface 402 and the 2nd inner peripheral surface 412 have a spherical shape, it becomes possible to suppress the diffusibility of the spotlight radiate | emitted from a lighting fixture.

  The first inner peripheral surface 402 and the second inner peripheral surface 412 may include a flat surface.

  As a result, the spot emitted from the luminaire is compared with the case where the first inner peripheral surface 402 and the second inner peripheral surface 412 have a spherical shape and the case where only the second inner peripheral surface 412 has a planar shape. It becomes possible to suppress the diffusibility of light.

  The first inner peripheral surface 402 has a spherical shape, and the second inner peripheral surface 412 is formed with an annular protrusion that protrudes in a direction away from the plane including the LED light source 10 with the optical axis as a normal line. May be.

  As a result, the degree of diffusion of the spot light emitted from the lighting fixture can be controlled with high accuracy.

(Other)
As mentioned above, although the lighting fixture which concerns on this invention was demonstrated based on embodiment and its modification, this invention is not limited to embodiment and modification which were mentioned above.

  For example, in the above-described embodiment, as an example of the lens member, the protrusion has been described using, for example, a lens having a Fresnel shape (Fresnel lens), but is not limited to this example. A lens that is refracted or transmitted is formed in the central region of one of the light incident surface and the light emitting surface, and a projection that is a polygonal lens that is totally reflected is formed in a region other than the central region. As long as the light incident from the light exits from the light exit surface, the Fresnel lens need not be used.

  In the above-described embodiment and modification, the LED light source 10 is configured to emit white light by the blue LED and the yellow phosphor, but is not limited thereto. For example, a phosphor-containing resin containing a red phosphor and a green phosphor may be used so that white light is emitted by combining this with a blue LED.

  Moreover, in embodiment and the modification which were mentioned above, although LED12 used LED which light-emits blue, it is not restricted to this. As LED12, you may use LED which light-emits colors other than blue. For example, when an LED chip that emits ultraviolet rays is used as the LED 12, a combination of phosphor particles that emit light in three primary colors (red, green, and blue) can be used as the phosphor particles. Furthermore, a wavelength conversion material other than the phosphor particles may be used. For example, the wavelength conversion material absorbs light of a certain wavelength such as a semiconductor, a metal complex, an organic dye, or a pigment, and has a wavelength different from the absorbed light. A material containing a substance that emits light may be used.

  Moreover, although LED was illustrated as a light emitting element in embodiment and the modification which were mentioned above, you may use light emitting elements, such as semiconductor light emitting elements, such as a semiconductor laser, organic EL (Electro Luminescence), or inorganic EL.

  Moreover, although LED light source was illustrated as a light source in embodiment and the modification which were mentioned above, you may use light sources, such as a light bulb.

  In the above-described embodiment and modification, the reflection member 30 reflects light incident from the incident port. However, the light bounced off by the lens member 40 may be guided to the emission port again. That is, the light reflected by the lens member 40 may be reflected and emitted from the emission port.

  In the above-described embodiment and modification, the lens member 40 has concentric and annular protrusions T1 to T4 centered on the optical axis of the lens member 40 on the light incident side. The shape of the protrusion is not limited to an annular shape. Instead of an annular shape, it may be a polygonal shape such as a square shape, or an elliptical shape. In other words, the shape of the protrusion may be a concentric ring.

  In the embodiment and the modification described above, the LED light source 10 has a COB (Chip On Board) type configuration in which the LED chip is directly mounted on the substrate 11 and the LED chip is collectively sealed with a phosphor-containing resin. However, it is not limited to this. For example, it is configured by mounting a plurality of LED elements on a substrate using a package type LED element in which an LED chip is mounted in a resin-molded cavity and a phosphor-containing resin is sealed in the cavity. A surface mount type (SMD) LED light source may be used.

  In addition, as long as it does not deviate from the gist of the present invention, various modifications conceived by those skilled in the art are applied to the present embodiment and the modified examples, or a form constructed by combining the constituent elements in the embodiments and modified examples, It is included within the scope of the present invention.

1 Lighting fixture 10 LED light source (light source)
11 Substrate 12 LED (Light Emitting Element)
13 Sealing member 20 Housing 30 Reflecting member 40, 41, 42, 43, 540 Lens member (optical member)
DESCRIPTION OF SYMBOLS 50 Auxiliary reflection member 401 1st outer peripheral surface 402 1st inner peripheral surface 411 2nd outer peripheral surface 412 2nd inner peripheral surface 501 Cone part 502 Frame main-body part K1, K2, K3, K4 Refractive surface Li, Lo Light P0 plane R1 , R2, R3, R4 Reflective surface T1, T2, T3, T4 Projection

Claims (7)

A light source;
An optical member disposed in front of the light source from the light source so as to face the light source, and distributing light emitted from the light source in a predetermined direction;
The optical member includes a first outer peripheral surface that is an outer peripheral region on the light incident side and includes a plurality of concentric annular protrusions centered on the optical axis of the optical member, and an inner peripheral side of the first outer peripheral surface. A first inner peripheral surface that is a region, a second outer peripheral surface that is an outer peripheral region on the light emitting side and that faces the first outer peripheral surface, and an inner peripheral side region of the second outer peripheral surface that is the first A second inner peripheral surface facing the inner peripheral surface,
The first inner peripheral surface protrudes in a direction away from a plane including the light source with the optical axis as a normal line than the first outer peripheral surface.
The second inner peripheral surface protrudes in a direction away from the plane than the second outer peripheral surface. The lighting apparatus according to claim 1, wherein the protrusion includes a refracting surface that refracts the emitted light and a reflecting surface that is formed on an outer peripheral side of the refracting surface and reflects light incident on the protrusion. The lighting fixture according to claim 1, wherein the second outer peripheral surface is flat. The lighting fixture according to claim 1, wherein the first inner peripheral surface and the second inner peripheral surface have a spherical shape. The first inner peripheral surface has a spherical shape,
The lighting fixture according to claim 1, wherein the second inner peripheral surface includes a flat surface. The lighting fixture according to claim 1, wherein the first inner peripheral surface and the second inner peripheral surface include a flat surface. The first inner peripheral surface has a spherical shape,
The lighting fixture of any one of Claims 1-3 in which the cyclic | annular protrusion part which protruded in the direction away from the said plane is formed in the said 2nd internal peripheral surface.

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