JP6761968B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device including an optical member.

Conventionally, a light source module which is an example of a lighting device including an LED light source which is an example of a light source and an optical direction changing member which is an example of an optical member is known (see, for example, Patent Document 1).

Japanese Patent No. 5635495

In the lighting device disclosed in Patent Document 1, the optical member has a convex curved surface shape that approaches the light source. For this reason, the temperature of the optical member rises in a portion close to the light source, and there is a risk of melting. The higher the output of the light source, the more prominent such problems become.

Therefore, in order to suppress the temperature rise of the optical member, it is conceivable to separate the optical member from the light source. However, in this case, it becomes difficult to secure the light-collecting property of the optical member.

Therefore, an object of the present invention is to provide a lighting device capable of ensuring the light-collecting property of the optical member while suppressing the temperature rise of the optical member.

In order to solve the above problems, one aspect of the lighting device according to the present invention includes a light source, an optical member that controls the direction of light from the light source, and a reflecting member that reflects light and causes it to enter the optical member. The optical member comprises a first translucent portion that transmits and emits light incident from the light source, and a second transmissive portion that projects from the first transmissive portion in a direction away from the light source. The first translucent portion has a projecting portion having a structure that projects in a direction away from the light source, and the second transmissive portion is provided so as to surround the periphery of the projecting portion. The inner surface of the second translucent portion has an annular step portion, and each step constituting the step portion gradually reduces in diameter as it approaches the protruding portion, and the first transmissive portion Surrounds the periphery of the light source when viewed in a direction away from the light source, and projects toward the side opposite to the second transmissive portion so as to separate the light source from the first transmissive portion. The light source is arranged outside the space formed by the wall portion and the first translucent portion .

According to the present invention, it is possible to secure the light-collecting property of the optical member while suppressing the temperature rise of the optical member.

It is a perspective view which shows the appearance of the lighting apparatus which concerns on embodiment. It is an exploded perspective view which shows a part of the lighting apparatus which concerns on embodiment. It is sectional drawing which shows a part of the lighting apparatus which concerns on embodiment. It is a partially enlarged sectional view which shows the reflection member, the optical member and the light control member in the lighting apparatus which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions of the components, connection forms, etc. shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

Further, the description of "abbreviated **" is intended to include not only exactly the same but also substantially the same when explaining by taking "substantially the same" as an example.

It should be noted that each figure is a schematic view and is not necessarily exactly illustrated. Further, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate description will be omitted or simplified.

(Embodiment)
Hereinafter, the lighting device according to the embodiment of the present invention will be described.

[Constitution]
First, the configuration of the lighting device according to the present embodiment will be described with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing the appearance of the lighting device 1 according to the embodiment. FIG. 2 is an exploded perspective view showing a part of the lighting device 1 according to the embodiment. FIG. 3 is a cross-sectional view showing a part of the lighting device 1 according to the embodiment. FIG. 4 is a partially enlarged cross-sectional view showing the reflection member 40, the optical member 50, and the light control member 60 in the lighting device 1 according to the embodiment. The thick solid line in FIG. 4 indicates the light from the light source 30.

In FIG. 1, in the lighting device 1, the light control member 60 side is defined as the front side, and each direction of front / rear, left / right, and up / down is displayed. Then, each direction shown in each figure after FIG. 1 is displayed corresponding to each direction shown in FIG. In FIG. 1, the vertical direction, the horizontal direction, and the front-back direction are not limited to this because they change depending on the usage mode of the user. The same applies to each of the figures after FIG.

As shown in FIGS. 1 and 2, the lighting device 1 includes a lamp body 10, a light source 30, a mounting member 32, a reflecting member 40, an optical member 50, an optical control member 60, an arm 70, and a power supply box 90. ..

The lamp body 10 is a member for arranging a light source 30, a mounting member 32, a reflecting member 40, an optical member 50, a light control member 60, and the like inside. The lamp body 10 is made of metal and functions as a heat sink that dissipates heat generated from the light source 30. In the present embodiment, the lamp body 10 is formed through, for example, an aluminum die casting process. The paint color on the outer surface of the lamp body 10 may be selected according to the application of the lighting device 1.

As shown in FIG. 3, the lamp body 10 is integrally formed with a cylindrical portion 11 having a cylindrical shape extending in the front-rear direction and the tubular portion 11, and the internal space of the tubular portion 11 is referred to as a front space 121. It has a partition wall portion 16 that partitions the rear space 122. Since the partition wall portion 16 is integrally formed with the tubular portion 11, the heat generated from the light source 30 is efficiently conducted to the tubular portion 11. Since the tubular portion 11 is exposed to the outside, it is cooled by the outside air.

The tubular portion 11 has a front opening 111 that opens at the front end and a rear opening 112 that opens at the rear end. The front opening 111 is located at the front end of the front space 121 of the tubular portion 11. The rear opening 112 is located at the rear end of the rear space 122 of the tubular portion 11.

In the front space 121, the light source 30 is mounted on the mounting surface 161 which is one side surface (front surface) of the partition wall portion 16. Further, in the front space 121, the mounting member 32, the reflecting member 40, the optical member 50, and the optical control member 60 are arranged in this order toward the front.

The light source 30 is a light source including a solid-state light emitting element. The light source 30 is arranged in the front space 121 of the tubular portion 11 and emits light that becomes the emission light of the lighting device 1. In the present embodiment, the light source 30 is a light emitting module having an LED (Light Emitting Diode), and is an LED light source that emits a predetermined light radially. For example, the light source 30 is configured to emit white light.

As shown in FIG. 2, the light source 30 is composed of a COB (Chip On Board) type LED, and includes a base 302, a plurality of LEDs 304 which are bare chips (LED chips) mounted on the base 302, and these LEDs 304. It has a sealing member containing a phosphor. In the present embodiment, the sealing member collectively seals all the LEDs 304, but the configuration of the sealing member is not limited to this. A plurality of line-shaped sealing members may be formed along the arrangement direction of the LEDs 304 arranged in a line shape.

The base 302 is a mounting substrate for mounting a plurality of LEDs 304, and is, for example, a ceramic substrate, a resin substrate, or a metal base substrate coated with insulation. Further, the base 302 has, for example, a plate shape having a rectangular flat surface when viewed from the front, and is fixed by attaching the bottom surface (rear direction side surface ) of the base 302 to the mounting surface 161 of the partition wall portion 16. .. Although not shown, the base 302 is formed with a pair of electrode terminals (positive electrode terminal and negative electrode terminal) for receiving DC power for causing the LED 304 (light source 30) to emit light from the outside.

The mounting member 32 is a member for mounting the light source 30 on the mounting surface 161 of the partition wall portion 16. The mounting member 32 uses a resin material such as polybutylene terephthalate (PBT) or polycarbonate. The mounting member 32 has a pair of locking portions 324 and a regulating portion 322.

The locking portion 324 is a claw-shaped portion for supporting the reflective member 40, and is locked to the locked portion 440 of the reflective member 40 in FIG.

The regulation portion 322 has a rectangular frame shape having a central opening 323 in the center. The regulation unit 322 regulates the position of the light source 30. The central opening 323 of the regulating portion 322 has a shape corresponding to the light source 30, and is arranged so that the light source 30 is exposed from the central opening 323.

Further, the mounting member 32 is arranged on the mounting surface 161 of the partition wall portion 16 and is fixed to the partition wall portion 16 by the two connecting members 36 and the two screws 38. As a result, the light source 30 arranged in the mounting member 32 and the central opening 323 thereof is fixed to the partition wall 16.

Connecting member 36 is a member to affix a wire (not shown) for supplying a current to the light source 30, to regulate the position of the light source 30. The connecting member 36 uses, for example, a resin material such as PBT or polycarbonate. A through hole through which the screw 38 penetrates is formed in the connecting member 36, and the connecting member 36 is fixed to the partition wall portion 16 and the mounting member 32 by the screw 38 inserted into the through hole. At that time, the connecting member 36 presses the light source 30 toward the partition wall 16 to regulate the position of the light source 30.

The wiring on the high potential side is connected to one connecting member 36, and the wiring on the low potential side is connected to the other connecting member 36. The connecting member 36 is provided with an electrode for supplying an electric current to the light source 30. The electrode is connected to an electrode terminal formed on the light source 30. The electrode of the connecting member 36 uses a conductive member such as copper.

The reflective member 40 is a member that controls the light distribution of light from the light source 30, and uses, for example, a hard white resin material such as polybutylene terephthalate (PBT). The reflecting member 40 reflects the light from the light source 30 toward the optical member 50. The reflective member 40 has a substantially tubular shape in which an opening 403 through which the optical axis X penetrates is formed.

The reflective member 40 has a cylindrical shape whose inner diameter gradually increases from the end on the side (rear side) where the light from the light source 30 is incident to the end on the side (front side) where the light is emitted. Is doing. Light from the light source 30 is reflected on the inner surface of the reflecting member 40.

As shown in FIG. 4, the reflective member 40 has a housing portion 401 and a frame body portion 405.

The accommodating portion 401 has a cylindrical shape configured so that the inner diameter gradually increases toward the end on the side (front side) where the light is emitted, the front end is open, and the rear side is bottomed. .. An opening 403 through which the optical axis X penetrates is formed in the central portion of the bottom portion 402 of the accommodating portion 401. The bottom portion 402 is provided with a tubular frame portion 405 extending rearward from the outer peripheral edge. The frame body portion 405 is provided so as to block the light from the light source 30 between the tip end (rear end) of the second protrusion 520 and the light source 30. That is, the frame body portion 405 is provided between the tip end (rear end) of the second protrusion 520 and the light source 30 so that the light from the light source 30 does not directly enter the rear end of the second protrusion 520. .. The frame body portion 405 forms an opening 403.

The frame body portion 405 is gradually narrowed toward the rear so as to reflect the light from the light source 30 toward the optical member 50. The frame body portion 405 is provided so as to surround the periphery of the light source 30, and exists on a straight line connecting the tip of the second protruding portion 520 (an example of the wall portion) and the light source 30.

As shown in FIGS. 2 and 3, a locked portion 440 that is locked to the locking portion 324 of the mounting member 32 is provided on the outer peripheral side of the reflective member 40. The locked portion 440 is a hole provided in a member erected on the outer peripheral side of the reflective member 40. The reflective member 40 is locked to the mounting member 32 by locking the locked portion 440 to the locking portion 324. As a result, the reflective member 40 is attached to the partition wall portion 16 via the attachment member 32.

The optical member 50 is a translucent member having a function of controlling and emitting the light distribution of the light incident from the light source 30, and is housed in the accommodating portion 401 of the reflecting member 40. The optical member 50 is formed by using a translucent material, and can be formed by using a transparent resin material such as PMMA (acrylic) or polycarbonate, or a transparent material such as glass material. The optical member 50 is a conical cylinder, and is configured to gradually become smaller toward the rear. The outer peripheral surface 501 of the optical member 50 is formed so as to reflect the light from the light source 30 incident from the second incident surface 522, which will be described later. The outer peripheral surface 501 is preferably configured to totally reflect such light. Further, a light reflecting member may be provided around the outer peripheral surface 501.

As shown in FIG. 4, the optical member 50 has a first translucent portion 510 and a second translucent portion 530.

The first light-transmitting unit 510 exists on the optical axis X, has a lens having a substantially disk shape in front view, and transmits light incident from the light source 30 to emit light. The first light transmitting portion 510 is provided so as to be substantially parallel to a plane formed in the vertical direction and the horizontal direction intersecting the optical axis X. The front view is a case where the rear direction (the direction opposite to the irradiation direction on the optical axis X) is viewed so as to face the lighting device 1. That is, the front is the front.

The first translucent portion 510 has a bottomed cylindrical shape that is closed on the front end side and open on the rear end side, and is configured so that the outer diameter of the first transmissive portion 510 gradually decreases toward the rear. Has been done. Further, the first translucent portion 510 is configured such that the inner diameter thereof gradually increases toward the rear.

The first translucent portion 510 has a flat plate portion 511, a first protruding portion 513 (an example of a protruding portion), and a second protruding portion 520.

The flat plate portion 511 has a disk shape and exists on the optical axis X, and is provided so as to be substantially parallel to a plane formed in the vertical direction and the horizontal direction intersecting the optical axis X. The flat plate portion 511 has a first incident surface 512 on which the light from the light source 30 is incident on the light source 30 side (rear side). The first incident surface 512 is provided so as to be substantially orthogonal to the optical axis X. The first incident surface 512 has a circular planar shape and has a diffusion structure for diffusing light (to suppress color spots and the like) (diffusion treatment is applied). As for the diffusion structure, for example, the first incident surface 512 can be provided with a light diffusion function by forming a light diffusion film (such as a large number of fine uneven dimples) on the first incident surface 512. Further, the diffusion structure may be provided with a light diffusion function by attaching a film or the like having a light diffusion function to the first incident surface 512.

The first protruding portion 513 has a Fresnel lens shape that protrudes in a direction away from the light source 30 on the front side of the flat plate portion 511, and constitutes a Fresnel lens together with the flat plate portion 511. The first projecting portion 513 has a first emitting surface 514 that emits transmitted light. The Fresnel lens shape of the first protrusion 513 is not limited to this embodiment.

The first emission surface 514 is an emission curved surface 515a, a first annular emission surface 516a, a second annular emission surface 517a, and the like, which will be described later. The first protruding portion 513 has a central protruding portion 515, an annular first annular protruding portion 516, and an annular second annular protruding portion 517. The lighting device 1 collects the emitted light by the Fresnel lens to form a spot-shaped lighting region.

The central protrusion 515 has an exit curved surface 515a which is a substantially spherical curved surface. It is preferable that the central axis of the central protrusion 515 substantially coincides with the optical axis X. The exit curved surface 515a is not limited to a substantially spherical curved surface, and may be a curved surface such as a rotating quadric surface, a rotating paraboloid, or a rotating hyperbola.

The first annular protrusion 516 is an annular protrusion provided so as to surround the central protrusion 515. It is preferable that the central axis of the first annular protrusion 516 substantially coincides with the optical axis X. The first annular protrusion 516 has a substantially triangular shape in cross-sectional view, and tapers toward the front. The first annular protrusion 516 has a first annular exit surface 516a and a first annular reflection surface 516b. The first annular exit surface 516a is the outer peripheral side surface of the first annular protrusion 516, and the first annular reflection surface 516b is the inner peripheral side surface of the first annular protrusion 516. The first annular exit surface 516a emits the light transmitted through the first translucent portion 510. The first annular exit surface 516a has a conical shape with a smaller diameter toward the front. The first annular reflecting surface 516b reflects the light transmitted through the first translucent portion 510.

The second annular protrusion 517 is an annular protrusion having a diameter larger than that of the first annular protrusion 516, and is provided so as to surround the central protrusion 515 and the first annular protrusion 516. It is preferable that the central axis of the second annular protrusion 517 substantially coincides with the optical axis X. The second annular protrusion 517 has a substantially triangular shape in cross-sectional view, and tapers toward the front. The second annular protrusion 517 has a second annular exit surface 517a and a second annular reflection surface 517b. The second annular exit surface 517a is the outer peripheral side surface of the second annular protrusion 517, and the second annular reflection surface 517b is the inner peripheral side surface of the second annular protrusion 517. The second annular exit surface 517a has a conical shape that decreases in diameter toward the front. The light transmitted through the first translucent unit 510 is emitted. The second annular reflecting surface 517b reflects the light transmitted through the first translucent portion 510.

The second protruding portion 520 is an annular protrusion that protrudes so as to surround the light source 30 (optical axis X of the light source 30). More specifically, the second protruding portion 520 is an annular protrusion that protrudes rearward from the outer peripheral edge of the flat plate portion 511 so as to surround the periphery of the first incident surface 512. In other words, the second projecting portion 520 projects toward the side opposite to the second translucent portion 530. The second protruding portion 520 has a substantially triangular shape in a cross-sectional view, and tapers toward the rear. The second projecting portion 520 has a second incident surface 522 on which light is incident from the light source 30 on the inner peripheral side. The tip of the second protruding portion 520 is close to the bottom portion 402 (the reflecting surface of the reflecting member 40) of the accommodating portion 401 of the reflecting member 40. It is preferable that the tip of the second protruding portion 520 and the bottom portion 402 of the accommodating portion 401 are close to each other so as not to come into contact with each other.

The second incident surface 522 is a conical surface whose diameter decreases as the distance from the light source 30 increases. It is preferable that the central axis of the second incident surface 522 coincides with the optical axis X. The second incident surface 522 has a diffusion structure for diffusing light. In the diffusion structure, for example, the second incident surface 522 can be provided with a light diffusion function by forming a light diffusion film (light diffusion layer) on the second incident surface 522. The diffusion structure of the second incident surface 522 may be the same as the diffusion structure of the first incident surface 512.

The second translucent portion 530 is an annular protrusion that projects from the outer peripheral edge of the flat plate portion 511 toward the direction away from the light source 30 so as to surround the periphery of the first projecting portion 513. The second light transmitting unit 530 has a second emitting surface 534 that emits the transmitted light. An annular step portion 535 is formed on the inner surface of the second translucent portion 530. In the present embodiment, the step portion 535 is composed of each step and has a stepped shape.

The step portion 535 has a smaller diameter as it approaches the first protruding portion 513 (toward the rear). In other words, the inner diameter of the second translucent portion 530 is gradually reduced (gradually reduced in diameter) as it approaches the light source 30 (toward the rear). The step portion 535 has an emission plane 535a parallel to a plane substantially orthogonal to the optical axis X and a wall surface 535b orthogonal to the emission plane 535a. It is preferable that the central axis of the step portion 535 substantially coincides with the optical axis X. Each exit plane 535a and each wall surface 535b is a second exit surface 534.

The front side of the second translucent portion 530 has an annular support portion 539 protruding in the outer diameter direction from the outer peripheral side of the second translucent portion 530. The rear surface of the annular support portion 539 is in contact with the tip end (front end) of the reflective member 40. It is preferable that no gap is formed between the annular support portion 539 and the tip of the reflective member 40.

As shown in FIG. 2, the optical member 50 is provided with three locked portions 540 on the annular support portion 539. In the present embodiment, the locked portion 540 is a portion having a concave shape provided on the annular support portion 539 of the optical member 50. The optical member 50 is locked to the reflective member 40 by locking the locked portion 540 of the optical member 50 to the locking portion 410 of the reflective member 40. The locking portion 410 has a claw-shaped portion for supporting the optical member 50. As a result, the optical member 50 is attached to the partition wall portion 16 via the reflection member 40 and the attachment member 32. Further, by arranging the optical member 50 in the accommodating portion 401 of the reflective member 40 in this way, the light reflected by the reflective member 40 is efficiently incident on the optical member 50.

The optical control member 60 has a substantially tubular shape that opens in the front-rear direction, and is formed of, for example, a resin material such as polycarbonate or PBT. It is housed in the front space 121 of the tubular portion 11 and is arranged in front of the optical member 50.

The light control member 60 has an incident opening 610 into which the light emitted from the optical member 50 is incident, and an exit opening 620 in which the light incident on the incident opening 610 is emitted. The light control member 60 is arranged so that the incident opening 610 is located near the optical member 50 and the exit opening 620 is located near the front opening 111 of the lamp body 10. The inner and outer diameters of the optical control member 60 gradually decrease from the front to the rear.

It is preferable that the optical control member 60 is arranged so that the optical axis X passes through the inside, and the central axis of the optical control member 60 and the optical axis X substantially coincide with each other. Further, the outer diameter of the front side of the optical control member 60 is substantially equal to the inner diameter of the tubular portion 11 so as not to interfere with the light emitted from the optical control member 60. Further, if the outer diameter on the front side of the optical control member 60 is substantially equal to the inner diameter of the tubular portion 11, leakage of emitted light from between the tubular portion 11 and the optical control member 60 is suppressed.

A black glare suppressing surface is formed on the inner surface of the light control member 60. As described above, the inner surface of the lamp body 10 near the front opening 111 is covered with the inner surface of the light control member 60, which is a black glare suppressing surface. This glare suppressing surface suppresses glare on the inner surface near the front opening 111 of the lamp body 10.

The inner surface of the light control member 60 is not particularly limited as long as it is a black glare suppressing surface. The black glare-suppressing surface can be realized, for example, by applying a matte treatment to the surface painted in black. Further, the black glare suppressing surface can also be realized by applying a graining process to a surface painted in black or a surface made of a black member. In the present embodiment, a step portion 630 (baffle) is provided on the inner surface of the optical control member 60 in order to further suppress glare on the inner surface of the optical control member 60.

As shown in FIGS. 2 and 3, the optical control member 60 has a locked portion 660 on the outer circumference. The light control member 60 is held inside the lamp body 10 by locking the locked portion 660 to the locking portion 114 recessed in the inner peripheral surface of the tubular portion 11. In the present embodiment, the locked portion 660 has a convex shape and is locked to the locking portion 114 having a concave shape.

The tubular portion 11 has a notch portion 113 and a light-shielding wall portion 14.

The notch 113 is a slit formed from the rear end of the tubular portion 11 toward the front. The notch 113 is formed so as to be able to engage with an arm 70 described later.

The light-shielding wall portion 14 extends forward from the mounting surface 161 and surrounds the light source 30. In the light-shielding wall portion 14, part of the light emitted from the light source 30 that leaks from the gap between the reflecting member 40 and the mounting surface 161 (or the light source 30) is combined with the tubular portion 11 of the lamp body 10. Suppresses leakage from between the reflective member 40.

Further, the tubular portion 11 has a plurality of front fin-shaped portions 15 having a fin-like shape integrally formed on at least one of the partition wall portion 16 and the tubular portion 11 in the front space 121. The front fin-shaped portion 15 has a function of conducting heat from at least one of the partition wall portion 16 and the tubular portion 11 and dissipating heat. When the front fin-shaped portion 15 is integrally formed with both the tubular portion 11 and the partition wall portion 16, the heat generated from the light source 30 passes from the partition wall portion 16 to the front fin-shaped portion 15 and is tubular. It is efficiently conducted to the shape portion 11. Further, the front fin-shaped portion 15 is arranged so as not to go out from the front space 121 to the outside of the lamp body 10 in order to suppress the uneven structure on the exposed surface of the lighting device 1.

As shown in FIG. 3, the partition wall portion 16 is formed with an insertion hole 162 and two through holes (not shown).

The insertion hole 162 is a hole through which a lead wire 92 for supplying electric power to the light source 30 is inserted from a power supply circuit built in the power supply box 90. In order to prevent light from leaking from the insertion hole 162 to the rear space 122, it is preferable that the inner diameter of the insertion hole 162 is substantially the same as the outer diameter of the lead wire 92.

The through hole is a hole for fixing the arm support base 20 that supports the arm 70 to the partition wall portion 16. The arm support base 20 is fixed to the partition wall portion 16 by screwing the two screws 26 shown in FIG. 2 into the screw holes formed at the front end of the arm support base 20 through the through holes, respectively.

Further, the tubular portion 11 includes a plurality of rear fin-shaped portions (not shown) having a fin-like shape integrally formed on at least one of the tubular portion 11 and the partition wall portion 16 in the rear space 122. The rear fin-shaped portion has the same function as the front fin-shaped portion 15.

The arm support 20 is made of a metal material. In the present embodiment, the arm support base 20 is formed, for example, through an aluminum die casting process. The paint color of the outer surface of the arm support base 20 may be selected according to the application of the lighting device 1. In the present embodiment, the arm support base 20 is painted white like the lamp body 10.

The arm support base 20 is a member that supports the arm 70. The arm support base 20 is fixed to the lamp body 10 in the rear space 122. In the present embodiment, the arm support base 20 is fixed to the rear space 122 side of the partition wall portion 16.

The arm support base 20 has a heat radiating portion 28 thermally connected to the lamp body 10 and an arm support portion 242 connected to the lower end of the arm 70. As described above, in the present embodiment, the arm support base 20 is fixed to the partition wall portion 16 of the lamp body 10. As a result, the heat radiating portion 28 of the arm support base 20 has a function of radiating heat generated from the light source 30. In the present embodiment, the heat radiating portion 28 is arranged on the rear side of the arm support base 20. The heat radiating unit 28 has an exposed surface that is exposed to the outside. In the present embodiment, the heat radiating portion 28 has a substantially disk-like shape, and a plurality of concave-convex-shaped grooves are formed along substantially the vertical direction on the main surface on the side exposed to the outside. There is. Since the surface area of the heat radiating portion 28 is increased by the groove, the heat radiating efficiency is improved.

The heat radiating portion 28 closes the rear opening 112, which is an opening on the rear space 122 side of the lamp body 10. By closing the rear opening 112 with the heat radiating portion 28 in this way, it is possible to prevent the plurality of rear fin-shaped portions 17, the lead wires 92, and the like arranged in the rear space 122 of the lamp body 10 from being visually recognized from the outside. it can. Note that the occlusion here does not necessarily mean a complete occlusion. For example, even if a gap required for inserting the heat radiating portion 28 (that is, the arm support base 20 in the present embodiment) from the rear opening 112 is provided between the heat radiating portion 28 and the rear opening 112. Good. Further, it is sufficient that the heat radiating unit 28 closes most of the inside of the rear space 122 of the lamp body 10 to the extent that it cannot be visually recognized.

Further, the outer surface of the rear space 122 of the heat radiating portion 28 has an uneven structure and is arranged inside the rear space 122 side.

The arm 70 is a member whose one end side (upper side) is connected to the power supply box 90 and the other end side (lower side) is connected to the lamp body 10. The arm 70 has a columnar rotating shaft portion that protrudes in opposite directions. In the present embodiment, the rotating shaft portion has a columnar shape extending in a direction perpendicular to the vertical direction of the optical axis X and the arm 70. The arm 70 is rotatably attached to the arm support base 20 by being sandwiched between the leaf spring and the arm support portion 242 of the arm support base 20. That is, the arm 70 is connected to the lamp body 10 via the arm support base 20. The arm 70 is arranged in a notch 113 formed in a side surface portion of the tubular portion 11.

The arm 70 is made of a metal material and is formed, for example, through an aluminum die casting process. Inside the arm 70, insertion holes 76 are formed in the vertical direction of the arm 70. A lead wire 92 is inserted into the insertion hole 76, and power is supplied from the power supply box 90 to the light source 30 by the lead wire 92. The arm 70 is configured to prevent the lead wire 92 from being exposed to the outside and being damaged.

The power supply box 90 is a housing having a built-in power supply circuit that supplies electric power to the light source 30. The power supply circuit built in the power supply box 90 converts the AC power supplied from the outside of the power supply box 90 into DC power, and supplies the DC power to the LED 304 of the light source 30 via the lead wire 92.

In such a lighting device 1, as shown by a thick solid line in FIG. 4, the light from the light source 30 is, for example, a frame of a reflecting member 40 existing between the LED 304 of the light source 30 and the tip of the second protrusion 520. It is reflected by the body part 405. The light reflected by the frame body portion 405 is incident from the second incident surface 522 of the second protruding portion 520, transmits light inside, and is emitted from the exit plane 535a of the step portion 535. Further, when the light from the light source 30 is directly incident on the first incident surface 512 of the first translucent portion 510, the light is transmitted through the first transmissive portion 510 and the first annular exit surface of the first annular projecting portion 516. Emit from 516a. Further, when the light from the light source 30 is directly incident on the second incident surface 522 of the first transmissive unit 510, the light is transmitted through the first transmissive unit 510, reflected by the outer peripheral surface 501 of the optical member 50, and is the first. It emits light from the first annular exit surface 516a of the 1 annular protrusion 516.

As described above, in the lighting device 1, a spot-shaped lighting region is formed in the forward direction. Light distribution is appropriately controlled by such an optical member 50. In addition, an example of an optical path is shown here, and the optical path is not limited to these.

[Action effect]
Next, the action and effect of the lighting device 1 in the present embodiment will be described.

As described above, the lighting device 1 according to the present embodiment includes a light source 30, an optical member 50 that controls the direction of light from the light source 30, and a reflecting member 40 that reflects light and causes it to enter the optical member 50. It has. Further, the optical member 50 has a first translucent portion 510 that transmits and emits light incident from the light source 30, and a second transmissive portion that protrudes from the first transmissive portion 510 in a direction away from the light source 30. It has 530 and. Further, the first translucent portion 510 has a first projecting portion 513 having a structure that projects in a direction away from the light source 30. Further, the second translucent portion 530 is provided so as to surround the periphery of the first projecting portion 513. Further, the inner surface of the second translucent portion 530 has an annular step portion 535. Then, each step constituting the step portion 535 gradually shrinks in diameter as it approaches the first protruding portion 513.

According to this configuration, since the first projecting portion 513 of the first translucent portion 510 projects in the direction away from the light source 30, it is possible to suppress the temperature rise of the first projecting portion 513. Further, the first projecting portion 513, the step portion 535, and the like collect the light from the light source 30 to facilitate the formation of a spot-shaped illumination region.

Therefore, it is possible to secure the light-collecting property of the optical member 50 while suppressing the temperature rise of the optical member 50.

Since the annular step portion 535 is formed on the inner surface of the second translucent portion 530, the material cost of the second translucent portion 530 can be suppressed as compared with the case where the step portion 535 is not formed. ..

Further, in the lighting device 1 according to the present embodiment, the first translucent portion 510 projects so as to surround the periphery of the light source 30 and toward the opposite side (rear side) of the second transmissive portion 530. It has a second protruding portion 520.

According to this configuration, since the second projecting portion 520 projects toward the side opposite to the second translucent portion 530 so as to separate the first projecting portion 513 from the light source 30, the temperature of the first projecting portion 513 The rise can be suppressed more.

Further, in the lighting device 1 according to the present embodiment, the reflection member 40 is provided so as to block the light from the light source 30 between the tip of the second protrusion 520 and the light source 30.

According to this configuration, since the frame body portion 405 of the reflective member 40 exists on a straight line connecting the tip of the second protruding portion 520 and the light source 30, the second protruding portion 520 located near the light source 30. It becomes difficult for the light from the light source 30 to be directly irradiated. Therefore, it is possible to suppress the temperature rise of the second protruding portion 520.

Further, in the lighting device 1 according to the present embodiment, the first protruding portion 513 has a Fresnel lens shape.

According to this configuration, the wall thickness of the first protruding portion 513 can be reduced. Therefore, the time for molding the first protrusion 513 can be shortened, and the weight of the optical member 50 can be reduced and the manufacturing cost can be prevented from increasing.

In particular, if the first protruding portion 513 has a Fresnel lens shape, the light collecting property of the optical member 50 can be ensured.

Further, in the lighting device 1 according to the present embodiment, a first incident surface 512 on which light from the light source 30 is incident is formed on the opposite side of the first protruding portion 513 of the optical member 50. The first incident surface 512 has a diffusion structure for diffusing light.

According to this configuration, it is possible to suppress the occurrence of light color spots and light luminance spots.

Further, in the lighting device 1 according to the present embodiment, a second incident surface 522 on which the light from the light source 30 is incident is formed on the inner peripheral surface of the second protruding portion 520 on the light source 30 side (optical axis X side). It is formed. The second incident surface 522 has a diffusion structure for diffusing light.

According to this configuration, it is possible to suppress the occurrence of light color spots and light luminance spots.

(Modification example, etc.)
The lighting device according to the present invention has been described above based on the present embodiment, but the present invention is not limited to the above embodiment.

For example, in the above embodiment, the first protruding portion has two annular protrusions, a first annular protrusion and a second annular protrusion, but has a larger diameter than the second annular protrusion. A plurality of annular protrusions forming an annular shape may be provided.

Further, in the above embodiment, the rear fin-shaped portion is integrally formed with both the tubular portion and the partition wall portion, but the configuration of the rear fin-shaped portion is not limited to this. The rear fin-shaped portion may be integrally formed on at least one of the tubular portion and the partition wall portion.

Further, in the above embodiment, the front fin-shaped portion is integrally formed with any of the tubular portion, the partition wall portion, and the light-shielding wall portion, but the configuration of the front fin-shaped portion is not limited to this. The front fin-shaped portion may be integrally formed with at least one of the tubular portion, the partition wall portion, and the light-shielding wall portion.

Further, in the above embodiment, the COB type LED is used as the light source, but other solid-state light emitting elements may be used. For example, an SMD (Surface Mount Device) type LED may be used. Further, another solid-state light emitting element such as an organic EL (Electroluminescence) element may be used.

In addition, it is realized by applying various modifications to each embodiment that can be conceived by those skilled in the art, or by arbitrarily combining the components and functions of each embodiment within the range not deviating from the gist of the present invention. The form is also included in the present invention.

1 Lighting device 30 Light source 40 Reflecting member 50 Optical member 510 First translucent part 512 First incident surface 513 First protruding part (protruding part)
520 Second protrusion (wall)
522 Second incident surface 530 Second translucent part 535 Step part

Claims (5)

Light source and
An optical member that controls the direction of light from the light source,
It is provided with a reflecting member that reflects light and causes it to enter the optical member.
The optical member has a first translucent portion that transmits and emits light incident from the light source, and a second transmissive portion that projects from the first transmissive portion in a direction away from the light source. And
The first translucent portion has a projecting portion having a structure that projects in a direction away from the light source.
The second translucent portion is provided so as to surround the periphery of the protruding portion.
An annular step portion is provided on the inner surface of the second translucent portion.
Each step constituting the step portion gradually shrinks in diameter as it approaches the protruding portion.
The first translucent portion and the second transmissive portion so as to surround the periphery of the light source when viewed in a direction away from the light source and to separate the light source from the first transmissive portion. It has a wall that protrudes toward the opposite side,
The light source is an illuminating device arranged outside the space formed by the wall portion and the first translucent portion. The reflecting member, between the tip and the light source of the wall portion, the lighting apparatus according to claim 1, wherein is provided so as to block the light from the light source. The lighting device according to claim 1 or 2 , wherein the protruding portion has a Fresnel lens shape. A first incident surface on which light from the light source is incident is formed on the opposite side of the protruding portion of the optical member.
The lighting device according to any one of claims 1 to 3 , wherein the first incident surface has a diffusion structure for diffusing light. A second incident surface on which the light from the light source is incident is formed on the inner peripheral surface of the wall portion on the light source side.
Wherein the second incident surface, and has claim 2 Symbol mounting lighting device has a diffusion structure for diffusing light.

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