JP2017103051A - lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp in which maintenance is easy.SOLUTION: A lamp has a light emitting element as a light source, and it has a lens 20 on a light emission side of the light source. The lens 20 has an incident surface part 22 and an emission surface part 26. The incident surface part 22 has a first incident surface 23 and a second incident surface 24. The first incident surface 23 is formed on an optical axis K of the light emitting element, and it has a plurality of projections 23A which project to the light emitting element side. The second incident surface 24 is formed around the first incident surface 23, and it has a refraction surface 25A, and a reflection surface 25B for condensing and reflecting the light entered the refraction surface 25A to the front of the lamp. The emission surface part 26 has a first emission surface 27 and a second emission surface 28. The first emission surface 27 is formed on the optical axis K of the light emitting element and it has a projection-shape toward the lamp front. The second emission surface 28 is formed so as to be connected smoothly to the periphery of the first emission surface 27, and it refracts the light condensed and reflected on the reflection surface 25B.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a lamp using a light emitting element as a light source.

  Conventionally, a lamp including a light emitting element and a lens that transmits light of the light emitting element is known (see, for example, Patent Document 1). In this type of lamp, a light emitting element is diffused by providing a Fresnel lens portion on the inner side, a total reflection lens on the outer side, and regularly arranging irregularities on the exit surface of the lens.

JP 2014-11138 A

However, in the above-described conventional configuration, since the exit surface exposed to the outside is provided with irregularities, dust and debris tend to accumulate on the exit surface, causing a decrease in luminous flux and an increase in temperature. There is a problem that maintenance becomes complicated.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a lamp that can be easily maintained.

  In order to achieve the above-described object, the lamp of the present invention is a lamp having a light emitting element as a light source, and includes a lens on the light exit side of the light source, and the lens has an entrance surface portion and an exit surface portion. The incident surface portion has a first incident surface and a second incident surface, and the first incident surface is formed on the optical axis of the light emitting element and has a plurality of convex portions that are convex toward the light emitting element side. The second incident surface is formed around the first incident surface, has a refracting surface, and a reflecting surface that condenses and reflects the light incident on the refracting surface in front of the lamp, and the emitting surface portion has the first surface. The first emission surface is formed on the optical axis of the light emitting element and has a convex shape toward the front of the lamp, and the second emission surface has a first emission surface and a second emission surface. Formed so as to be gently connected around one emission surface, and refracts the light condensed and reflected by the reflection surface And wherein the door.

In the above-described configuration, the light source may be a COB type light emitting diode having a plurality of the light emitting elements.
In the above configuration, the light source may be placed on a metal flat plate portion, a bowl-shaped lens holding member may be connected to the flat plate portion, and an outer peripheral portion of the lens may be placed on the lens holding member. .
In the above-described configuration, the lens holding member may have light transmittance.
In the above-described configuration, a projection may be provided on the outer peripheral portion of the lens, and the lens may be placed in a state where the projection is engaged with an engagement portion formed on the lens holding member. .

  According to the present invention, since the first incident surface is formed on the optical axis of the light emitting element and has a plurality of convex portions protruding toward the light emitting element, maintenance is facilitated.

It is a perspective view which shows the lamp | ramp which concerns on embodiment of this invention from upper direction. It is a perspective view which shows a lamp | ramp from the bottom. It is a figure which shows a lamp | ramp, (A) is a top view, (B) is a front view, (C) is a bottom view. It is a disassembled perspective view which shows a lamp | ramp. It is a figure which shows a lamp | ramp, (A) is VV sectional drawing of FIG. 3, (B) is an enlarged view of A part of (A). It is a perspective view which shows a base member from the downward direction. It is a VII-VII sectional view of Drawing 3, (A) is a general view and (B) is an enlarged view of the B section of (A). It is a figure which shows a lens, (A) is a top view, (B) is a front view, (C) is a bottom view, (D) is a side view. It is IX-IX sectional drawing of FIG. It is a light ray diagram of a lens. It is a figure which shows the lens which concerns on the modification of this invention, (A) is a top view, (B) is a front view, (C) is a bottom view, (D) is a side view. It is XII-XII sectional drawing of FIG. It is a light ray figure of the lens concerning a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following embodiments, a lamp having an LED as a light source is exemplified as a lamp having a light emitting element as a light source. However, the present invention is not limited to this, and other light emitting elements such as an organic EL, for example. The present invention can also be applied to a lamp having a light source.

FIG. 1 is a perspective view showing the lamp 1 according to the present embodiment from above, and FIG. 2 is a perspective view showing the lamp 1 from below. 3 is a view showing the lamp 1. FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a bottom view. FIG. 4 is an exploded perspective view showing the lamp 1. FIG. 5 is a view showing the lamp 1, FIG. 5 (A) is a cross-sectional view taken along the line VV of FIG. 3, and FIG. 5 (B) is an enlarged view of a portion A of FIG.
The lamp 1 is configured to have substantially the same shape and optical characteristics as an existing halogen bulb or incandescent bulb, and can be used as an alternative to the existing bulb.

  That is, as shown in FIGS. 1 to 3, the lamp 1 has a substantially cylindrical base body (power supply housing portion) 2, and the light emitting portion 4 is provided at the tip portion 2 </ b> A (FIG. 4) that is one end portion of the base body 2. And a base 6 is provided at the terminal end 2B which is the other end. The base 2 is made of an insulating material such as ceramic or resin. The base 6 includes a cylindrical shell 6A that is threaded into a socket (not shown) and an eyelet 6C that is provided at the end of the shell 6A via an insulating portion 6B. The shell 6A and the eyelet 6C are configured to have a shape and size that can be attached to an existing socket. Thereby, the said lamp | ramp 1 can be mounted | worn with the existing socket on a ceiling or a wall surface, and can be used as a substitute of the existing halogen light bulb and an incandescent light bulb. In the present embodiment, the base 6 is an E11 standard, but the type of the base 6 is not limited to this.

  The light emitting unit 4 includes an LED (light emitting element) 10 as a light source, and a lighting circuit 12 of the LED 10 is housed inside the base 2 as shown in FIG. The lighting circuit 12 includes a lighting circuit board 12A on which a plurality of circuit components such as a driver circuit and a power supply circuit required for lighting are mounted. The circuit component of the lighting circuit 12 and the shell 6A and the eyelet 6C of the base 6 are electrically connected to each other, and by attaching the base 6 to the socket, the socket 6A and the eyelet 6C of the base 6 are socketed. To the circuit components of the lighting circuit 12.

The configuration of the light emitting unit 4 will be described in detail. The light emitting unit 4 includes an LED 10, a base member (cylindrical portion) 16, a lens holding member 18, and a lens 20.
As the LED 10, a surface-mount type LED package that emits white light is used. That is, although not shown, the LED 10 has a chip-on-board (COB) structure in which a large number of LED elements are densely arranged on a substrate to form a planar light emitting surface 10A having a substantially circular shape (which may be a quadrangle). Chip. The optical axis K of the LED 10 is perpendicular to the light emitting surface 10 </ b> A and is positioned substantially coaxially with the central axis C of the base 2.

  The LED 10 includes an LED chip and a thin package having a substantially rectangular shape in plan view in which a housing recess for housing the LED chip is formed, and the LED chip is sealed with a transparent resin such as silicone resin in the housing housing recess. Has been. In this transparent resin, phosphors (fluorescent pigments, fluorescent dyes, etc.) are dispersed as wavelength conversion materials that are excited by light emitted from the LED chip and emit light of a light emission color different from that of the LED chip. The white color is obtained by mixing the light from the LED chip and the light from the phosphor.

FIG. 6 is a perspective view showing the base member 16 from below. 7 is a cross-sectional view taken along the line VII-VII in FIG. 3. FIG. 7A is an overall view, and FIG. 7B is an enlarged view of a portion B in FIG.
As shown in FIGS. 5 and 6, the base member 16 is a member that functions as a pedestal on which the LED 10 is placed, a heat sink of the LED 10, and a heat mass. The base member 16 includes a plate-like flat plate portion 30 having a substantially circular shape when viewed from above and a plurality of radiating fins 34 provided over the outer peripheral surface of the flat plate portion 30. For example, it is integrally formed of a metal material such as an aluminum material.

  As shown in FIG. 5, the flat plate portion 30 is provided with the LED 10 and the lens holding member 18 on the front main surface (one surface, top surface) side, and substantially perpendicular to the back main surface (other surface, bottom surface). A substrate 2 is provided. The flat plate portion 30 closes the distal end portion 2A of the base 2 and has an edge protruding in the radial direction to the outside of the distal end portion 2A of the base 2 over the entire circumference of the protruding edge. Radiation fins 34 to be described later that extend vertically along the outer peripheral surface of the base 2 are integrally provided.

  A fitting hole 32 </ b> A for fitting the LED 10 is provided on the upper surface of the flat plate portion 30. By fitting the LED 10 into the fitting hole 32A, the heat generation of the LED 10 moves from both the bottom surface and the side surface of the LED 10 to the pedestal portion 32, so that the heat radiation efficiency is improved. The LED 10 is fitted in the fitting hole 32A and is fixed to the flat plate portion 30 with an adhesive (not shown). Further, the pedestal portion 32 is provided with two through holes 32B (FIG. 6) penetrating vertically, and each lead wire (not shown) of positive potential and negative potential extending from the lighting circuit 12 of the base body 2 is provided. The LED 10 is connected through the through hole 32B.

The heat radiating fin 34 extends vertically along the central axis C of the base 2 at the edge of the flat plate portion 30, has a height width W, and is a sufficient heat mass (heat capacity) for absorbing heat generated by the LED 10. Function as.
Here, since the heat mass of the radiation fin 34 increases in proportion to the volume, the heat mass performance can be improved by increasing the height width W or the thickness T. At this time, if the thickness T is increased in a radial direction of the base 2 (a direction orthogonal to the central axis C) so as to protrude from a lens holding member 18 described later in plan view, the size of the lamp 1 is increased. . Therefore, it is desirable that the thickness T is limited to a thickness that allows the heat radiating fins 34 to be within the maximum diameter range of the lens holding member 18 in plan view.

  The upper end portion 34 </ b> A of the radiating fin 34 protrudes upward from the upper surface of the flat plate portion 30 by a predetermined protrusion amount P. The projecting amount P of the radiating fin 34 and the interval S (FIG. 3) between the radiating fins 34 are set to an amount capable of preventing the test finger defined in JIS C 0920 from touching the outer peripheral surface of the flat plate portion 30. Yes. In this embodiment, the protrusion amount P is set to 8 mm, and the interval S is set to 5 mm. Since the temperature of the heat radiating fin 34 is lower than that of the flat plate portion 30 to which the LED 10 is fixed, the heat radiating fin 34 serves as a guard and can prevent a finger or the like from contacting the upper surface and the outer peripheral surface of the flat plate portion 30.

As shown in FIG. 6, an insertion opening 39 for receiving the tip 2 </ b> A of the base 2 is formed on the bottom surface of the flat plate portion 30. As described above, since the distal end portion 2A of the base 2 is inserted and fixed in the insertion opening 39, the entire length of the lamp 1 can be shortened.
The insertion opening 39 constitutes the inner peripheral surface of the cylindrical base member 16, and at least one projecting portion 39 </ b> A (one in this embodiment) extending in the axial direction is provided on the inner peripheral surface. . As shown in FIG. 7, a groove 2C is provided on the outer peripheral surface of the base 2 at a position corresponding to the protrusion 39A and into which the protrusion 39A is inserted. When the distal end portion 2A of the base body 2 is inserted into the insertion opening 39, the protruding portion 39A is fitted into the groove portion 2C. By fitting the protrusion 39A and the groove 2C, the base member 16 can be easily positioned with respect to the base 2 and rotation of the base member 16 with respect to the base 2 can be prevented. The base member 16 and the base 2 are fixed with an adhesive (not shown). In the present embodiment, the protrusion 39A is provided on the base member 16 and the groove 2C is provided on the base 2. However, the base 2 may be provided with a groove and the base 2 may be provided with a protrusion.

  As shown in FIGS. 4 and 5, the base 2 is filled with a resin 14 so as to fill the lighting circuit 12, and the lighting circuit 12 is fixed to the base 2 by the resin 14. For the resin 14, a material having relatively low thermal conductivity (for example, urethane, silicon, acrylic, etc.) is used, and among them, a material having high heat resistance (for example, urethane, silicon, etc.) is desirable. The resin 14 is filled in such an amount that the base member 16 and the base 2 are not thermally connected. Specifically, among the circuit components of the lighting circuit 12, circuit components having relatively low heat resistance against the heat of the LED 10. Until filled. In the present embodiment, the resin 14 is filled so that all the circuit components of the lighting circuit 12 are filled.

  The resin 14 is filled in the base 2 in a state where the through hole 6D of the base 6 is closed and the lighting circuit 12 is disposed inside the base 2. By providing this resin 14, the heat of the lighting circuit 12 can be averaged, and the heat can be efficiently radiated from the outer peripheral surface of the base 2, and the heat of the LED 10 can be suppressed from being transferred to the circuit components. Moreover, it can suppress more reliably that the heat of LED10 transfers to a circuit component by filling the resin 14 so that all the circuit components of the lighting circuit 12 may be buried. Further, since the lighting circuit 12 is fixed by the resin 14 filled in the base body 2, a fixing structure such as screwing is not required, and the lighting circuit 12 can be easily fixed in the base body 2. . Furthermore, since the base body 2 is filled with the resin 14, the circuit components of the lighting circuit 12 are not affected by vibration, and the center of gravity of the lamp 1 can be positioned closer to the base 6 side.

  The resin 14 is filled with a gap δ between the flat plate portion 30 and the bottom surface. By providing a gap δ between the upper surface of the flat plate portion 30 and the resin 14, tolerances and assembly tolerances of the components themselves, and a tolerance of a filling amount and a filling position of the resin 14 can be absorbed. Can be prevented from bulging out. Further, the extra length of the lead wire extending from the lighting circuit 12 to the LED 10 and the insulating sheet 38 can be disposed in the gap δ. This insulating sheet 38 is formed in a thin disc shape, and insulation between the flat plate portion 30 and the lighting circuit 12 is reliably achieved.

The entire lens holding member 18 is configured to have a light transmitting property, and its optical axis is provided substantially coaxially with the central axis C of the base 2.
Specifically, the lens holding member 18 is formed of a milky white resin material containing a diffusing material, and no reflecting surface for light distribution control is formed. The lens holding member 18 is formed in a cylindrical shape, and has a tip opening 18A at the top and a bottom opening 18B at the bottom. The lens holding member 18 has a tip opening 18A larger than the bottom opening 18B, and has a bowl shape as a whole. The bottom opening 18B is integrally provided with a cylindrical neck portion 42 extending to the rear end side. The length L in the vertical direction of the neck portion 42 is set to be approximately equal to the protruding amount P of the heat radiating fin 34, so that the test finger touches the flat plate portion 30 from the gap between the lens holding member 18 and the heat radiating fin 34. Can be prevented.

  The lens holding member 18 is connected to the flat plate portion 30 of the base member 16. More specifically, a protrusion 44 is formed on the outer peripheral surface of the lens holding member 18, and at least one location (two locations in the present embodiment) of the adjacent radiating fins 34 is coupled to provide a coupling portion 36. The connecting portion 36 is formed with a hole 36A. The lens holding member 18 is fixed to the base member 16 with the protrusion 44 fitted into the hole 36A. At this time, the neck portion 42 is disposed along the inner surfaces of the plurality of heat radiation fins 34 and is placed on the flat plate portion 30. The neck portion 42 is bonded by a transparent adhesive 52 filled in a gap between the radiating fins 34. By fitting the projection 44 and the hole 36A, the lens holding member 18 can be easily fixed to the base member 16, and the lens holding member 18 can be prevented from being detached from the base member 16 even if the adhesive 52 is deteriorated.

  The lens holding member 18 is formed of a transparent material such as a transparent resin with respect to the light of the LED 10. That is, as shown in FIG. 4, the direct light M1 radiated from the LED 10 and the transmitted light M2 (FIG. 10) of the lens 20 are transmitted through the lens holding member 18 and radiated to the periphery as transmitted light M3. Thereby, since the transmitted light M3 is radiated | emitted from the substantially whole surface of the lens holding member 18, radial distribution close | similar to a halogen bulb or an incandescent bulb is realizable.

  Further, the light M4 incident on the neck portion 42 from the LED 10 is transmitted through the neck portion 42 and shines in the gap between the heat radiating fins 34, thereby causing the lower end (bottom opening 18 </ b> B) portion of the lens holding member 18. The light intensity in the radial direction is supplemented. Further, a part of the light M4 incident on the neck portion 42 becomes propagating light M5 propagating through the inside of the base material 60 of the lens holding member 18 to cause the whole base material 60 to emit light and increase the amount of radiated light in the radial direction. Will contribute.

  Thus, since the lens holding member 18 is made of a translucent material and does not have a reflecting surface for controlling light distribution, the lens holding member 18 can transmit light to the entire lens holding member 18, so that it is more natural. In addition, light can be emitted from all directions in the radial direction. Thereby, even with the lamp 1, light distribution close to that of the halogen bulb is realized. Moreover, since the lens holding member 18 is milky white containing a diffusing material and has a light scattering function to scatter transmitted light, it is possible to suppress unevenness in illuminance of light emitted in the radial direction.

Further, since the lens holding member 18 is formed of a resin material instead of metal or glass as in the prior art, the front end side of the lamp becomes light and the center of gravity of the lamp 1 can be positioned on the base 6 side. By positioning the center of gravity of the lamp 1 on the base 6 side, the vibration resistance of the lamp 1 can be improved. For example, even if the base 6 is a relatively small base such as E11, the lamp 1 can be firmly held. By improving the vibration resistance of the lamp 1, it is possible to prevent the lamp 1 from falling even when the lamp 1 is used alone as a downlight, for example.
The lens holding member 18 holds a lens 20.

8A and 8B are diagrams illustrating the lens 20, in which FIG. 8A is a plan view, FIG. 8B is a front view, FIG. 8C is a bottom view, and FIG. 8D is a side view. 9 is a cross-sectional view taken along the line IX-IX in FIG. FIG. 10 is a ray diagram of the lens 20.
As shown in FIGS. 5 and 8, the lens 20 is a light distribution control member that controls the light distribution of the LED 10. The lens 20 is a disk-shaped member made of resin, has a substantially truncated cone shape substantially along the inner surface of the bowl-shaped lens holding member 18, and the entire lens 20 is inserted into the lens holding member 18. Fixed. Specifically, an edge portion (outer peripheral portion) 20B protruding outward in the radial direction is integrally formed on the upper portion of the main body portion 20A of the lens 20. The lens 20 is held on the lens holding member 18 by placing the edge portion 20 </ b> B on the stepped portion 19 formed in the tip opening 18 </ b> A of the lens holding member 18.
Thus, the LED 10 is mounted on the metal flat plate portion 30, the bowl-shaped lens holding member 18 is connected to the flat plate portion 30, and the edge portion 20 </ b> B of the lens 20 is mounted on the lens holding member 18. The lamp 1 can be made compact and the lens 20 can be easily held.

  In addition, at least one (in this embodiment, one) projection 20B1 is provided on the edge 20B, and the projection 20B1 is engaged with a concave engagement portion 46 formed on the lens holding member 18. Thus, the lens 20 is placed. Thereby, rotation of the lens 20 with respect to the base member 16 can be prevented. In the present embodiment, the projection 20B1 is provided on the lens 20 and the engaging portion 46 is provided on the lens holding member 18. However, the engaging portion 46 may be provided on the lens 20, and the protruding portion may be provided on the lens holding member 18. .

Further, a cutout portion 48 is formed in the edge portion 20B at a position facing the projection portion 20B1. By providing the notch 48, a gap ε is formed between the lens 20 and the lens holding member 18, for example, when the lens 20 is removed from the lens holding member 18.
The lens 20 is fixed to the lens holding member 18 by bonding the edge 20B to the step 19 with an adhesive (not shown).

As shown in FIG. 9, the lens 20 includes an incident surface portion 22 on the upper surface of the main body portion 20A, and an output surface portion 26 on the bottom surface of the main body portion 20A. The incident surface portion 22 has a first incident surface 23 and a second incident surface 24.
The first incident surface 23 is formed on the optical axis K of the LED 10 (FIG. 4) and is set slightly larger than the light emitting surface 10 </ b> A of the LED 10. The first incident surface 23 has a plurality (nine in this embodiment) of convex portions 23A that are convex toward the LED 10 side. In the present embodiment, one convex portion 23A is disposed on the optical axis K, and the other convex portion 23A is disposed concentrically with the optical axis K. The plurality of convex portions 23A are arranged so as to be convex toward the LED 10 as a whole.

  The second incident surface 24 is formed around the first incident surface 23 and has at least one (three in this embodiment) side incident portion 25. The side incident portions 25 are stepped portions having a triangular cross section extending along a circle centered on the optical axis K. In the present embodiment, a plurality (three) of the side incident portions 25 are arranged concentrically. ing. Each side incident part 25 has a refracting surface 25A on the inner surface constituting the triangle and a reflecting surface 25B on the outer surface constituting the triangle. Each side incident portion 25 is formed such that light incident on the refracting surface 25A is totally reflected by the reflecting surface 25B and condensed in front of the lamp.

The exit surface portion 26 has a first exit surface 27 and a second exit surface 28. The first emission surface 27 is formed on the optical axis K of the LED 10 and has a convex shape toward the front of the lamp. The first exit surface 27 is formed to have substantially the same size as the first entrance surface 23. The second emission surface 28 is formed so as to be gently connected around the first emission surface 27.
The lens 20 is a reflective condensing lens provided with a surface (convex portion 23A and first emission surface 27) for condensing light and a reflecting surface 25B. The lens 20 and the lens holding member 18 constitute an optical member of this embodiment.

  In the lens 20 configured in this manner, as shown in FIG. 10, the light M6 emitted from the LED 10 and incident on each convex portion 23A is collected by the convex portion 23A and the convex first emission surface 27. Thus, the light M7 is emitted from the first emission surface 27 to the outside of the lens 20. Since the light M7 crosses in front of the lamp and spreads in the radial direction, uneven illuminance can be reduced. In addition, since the distance of the focal point F can be shortened by the convex portion 23A of the first incident surface 23 and the convex first emission surface 27, the light can intersect and spread at the focal point F, and uneven illuminance can be suppressed. Even if the LED 10 is a COB type light emitting diode having the planar light emitting surface 10A and relatively uneven illuminance, by providing the first incident surface 23 having the plurality of convex portions 23A, the uneven illuminance of the LED 10 Can be suppressed. The lens 20 according to the present embodiment is configured as a wide-angle lens having a relatively small number (nine) of convex portions 23A and a first emission surface 27 having a relatively large curvature.

Since the uneven surface having the plurality of convex portions 23A is provided as the first incident surface 23, the optical design by simulation becomes easier as compared with the case where the output surface portion 26 is provided with the uneven surface. In addition, by providing the uneven surface as the first incident surface 23, the convex first emission surface 27 can be easily formed compared to the case where the uneven surface is provided in the emission surface portion 26.
Here, in the case where the exit surface portion 26 is provided with an uneven surface having a plurality of convex portions 23A, since the uneven surface is located on the exit surface exposed to the outside, dust and debris are likely to accumulate on the exit surface and the luminous flux is reduced. In order to prevent such problems, the maintenance may be complicated. In the present embodiment, since the uneven surface is provided as the first incident surface 23, the maintenance becomes easier as compared to the case where the output surface portion 26 is provided with the uneven surface.

Also, the light M8 incident on the refracting surface 25A of the second incident surface 24 from the LED 10 to the side is condensed and reflected by the reflecting surface 25B to the front of the lamp and reflected from the second emitting surface 28 to the outside of the lens 20 as reflected light M9. The light can be collected at the center. Since the orientation is controlled by adjusting the refracting surface 25A, optical design by simulation becomes easy.
In addition, the entire incident surface portion 22 is not formed in a concavo-convex surface, but a concavo-convex first incident surface 23 is formed in the center, and a second incident surface 24 having a reflective surface 25B is formed on the first incident surface 23. The structure is formed around. Thereby, even if the reflective surface is not formed in the lens holding member 18, and the whole lens holding member 18 is comprised in a light transmittance, the fall of a light quantity can be suppressed.

  Here, part of the light traveling from the incident surface portion 22 toward the exit surface portion 26 is reflected by the surface of the exit surface portion 26 and travels toward the side lens holding member 18 as transmitted light M2. When the lens holding member 18 is formed in a cylindrical shape, stripes of light and darkness are generated in the radiated light from the lens holding member 18 due to the difference in intensity of the light reflected from the surface of the emission surface portion 26. In the present embodiment, since the lens holding member 18 is formed in a bowl shape, unevenness of the emitted light from the lens holding member 18 can be suppressed. In FIG. 10, the right half of the light traveling from the LED 10 toward the second incident surface 24 is omitted.

  As described above, according to the present embodiment, the lamp 1 includes the lens 20 on the light exit side of the LED 10, the lens 20 includes the incident surface portion 22 and the exit surface portion 26, and the incident surface portion 22 is the first surface. The first incident surface 23 has an incident surface 23 and a second incident surface 24. The first incident surface 23 is formed on the optical axis K of the LED and has a plurality of convex portions 23A that are convex toward the LED 10 side. The refracting surface 25A is formed around the first incident surface 23, and has a reflecting surface 25B that condenses and reflects the light incident on the refracting surface 25A in front of the lamp. The exit surface portion 26 is a first exit surface 27. And the second emission surface 28. The first emission surface 27 is formed on the optical axis K of the LED 10 and has a convex shape toward the front of the lamp. It was formed so as to be gently connected to the surroundings, and was condensed and reflected by the reflecting surface 25B. It was configured for refracting. With this configuration, since the first incident surface 23 having a plurality of convex portions 23A that are convex on the LED 10 side is provided, the maintenance becomes easier as compared with the case where the output surface portion 26 is provided with an uneven surface.

  Further, according to the present embodiment, even if the light source is a COB type light emitting diode having a plurality of LED elements, uneven illumination of the LED 10 is suppressed by including the first incident surface 23 having a plurality of convex portions 23A. it can.

  Further, according to the present embodiment, in the lamp 1, the LED 10 is mounted on the metal flat plate portion 30, the bowl-shaped lens holding member 18 is connected to the flat plate portion 30, and the edge of the lens 20 is connected to the lens holding member 18. It was set as the structure by which the part 20B was mounted. With this configuration, the lamp 1 can be configured compactly and the lens 20 can be easily held.

  Further, according to the present embodiment, since the lens holding member 18 has light transmittance, light can be emitted from all directions of the lens holding member 18.

  Further, according to the present embodiment, in the lamp 1, the projection 20 </ b> B <b> 1 is provided on the edge 20 </ b> B of the lens 20, and the projection 20 </ b> B <b> 1 is engaged with the engagement portion 46 formed on the lens holding member 18. The lens 20 is placed. With this configuration, rotation of the lens 20 relative to the base member 16 can be prevented.

However, the above-described embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above-described embodiment, the lens 20 is a wide-angle lens, but as shown in FIGS. 11 to 13, the lens 120 may be a medium-angle lens.
11A and 11B are diagrams illustrating a lens 120 according to a modification, in which FIG. 11A is a plan view, FIG. 11B is a front view, FIG. 11C is a bottom view, and FIG. 11D is a side view. It is. 12 is a cross-sectional view taken along the line XII-XII in FIG. FIG. 13 is a ray diagram of the lens 120 according to the modification.
11 and 12, the lens 120 is different from the lens 20 in the number of convex portions 23A provided on the first incident surface 23 of the incident surface portion 22, and is provided with 21 convex portions 23A. Specifically, one convex portion 23A is arranged on the optical axis K, eight convex portions 23A are arranged concentrically with the optical axis K, and the other twelve convex portions 23A are arranged around the concentric circle. They are arranged concentrically with the optical axis K. The lens 120 has a relatively large number (21) of convex portions 23A, and has a first emission surface 27 having a relatively small curvature, and is configured as a medium angle lens. The lens 120 is different from the lens 20 in the number of protrusions 20B1 and is provided with two protrusions 20B1. By making the number of the protrusions 20B1 different from that of the lens 20, the lens 20 can be easily distinguished. The number of protrusions 20B1 of the lens 120 may be the same as that of the lens 20.
Even when this lens 120 is used, the same effect as that obtained when the lens 20 is used can be obtained. In FIGS. 11 to 13, the same parts as those of the lens 20 are denoted by the same reference numerals and the description thereof is omitted. In FIG. 13, the right half of the light traveling from the LED 10 toward the second incident surface 24 is omitted.

  In the above-described embodiment, the lens holding member 18 is milky white. However, the lens holding member 18 may be configured so as to be entirely light transmissive, and may be transparent, for example.

1 lamp 10 LED (light emitting element, light source)
18 Lens holding member 20 Lens 20B Edge (outer periphery)
20B1 Protruding portion 22 Incident surface portion 23 First incident surface 23A Convex portion 24 Second incident surface 25A Refractive surface 25B Reflecting surface 26 Outgoing surface portion 27 First emitting surface 28 Second emitting surface 30 Flat plate portion 46 Engaging portion K Optical axis

Claims (5)

A lamp having a light emitting element as a light source,
A light exit side of the light source is provided with a lens,
The lens has an entrance surface portion and an exit surface portion,
The incident surface portion has a first incident surface and a second incident surface;
The first incident surface is formed on the optical axis of the light emitting element, and has a plurality of convex portions that are convex toward the light emitting element side,
The second incident surface is formed around the first incident surface, and has a refracting surface and a reflecting surface that condenses and reflects light incident on the refracting surface in front of the lamp,
The exit surface portion has a first exit surface and a second exit surface,
The first emission surface is formed on the optical axis of the light emitting element and has a convex shape toward the front of the lamp,
The second emission surface is formed so as to be gently connected around the first emission surface, and refracts the light condensed and reflected by the reflection surface.   The lamp according to claim 1, wherein the light source is a COB type light emitting diode having a plurality of the light emitting elements. The light source is placed on a flat plate made of metal,
Connect a bowl-shaped lens holding member to the flat plate portion,
The lamp according to claim 1, wherein an outer peripheral portion of the lens is placed on the lens holding member.   The lamp according to claim 3, wherein the lens holding member is light transmissive. The outer periphery of the lens is provided with a protrusion,
The lamp according to claim 3 or 4, wherein the lens is placed in a state where the protrusion is engaged with an engaging portion formed on the lens holding member.

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