JP2017016924A - LED lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lamp which can use an AC commercial power supply, which does not increase its dimension, and which can radiate the same light as a conventional halogen lamp with dichroic mirror from the back surface of an umbrella part.SOLUTION: An LED lamp includes: a substrate 3 in which a light source 2 is provided which is constituted by arraying a plurality of LED light-emitting elements; an umbrella part 4 provided so as to surround the substrate 3; and a heat radiation member 6 for supporting the substrate 3 and the umbrella part 4, and for radiating heat generating from the substrate 3. On the substrate 3, a power supply circuit is formed. The umbrella part 4 is formed in a hollow frustum shape having a wall part formed by a light permeable material. The LED lamp also includes a light guide body 7 which covers a front opening of the umbrella part 4, which is arranged by having a gap between itself and an inner peripheral surface 4a of the umbrella part, which radiates the light from the light source 2 frontward of the umbrella part 4, and which radiates one part of the light toward the inner peripheral surface 4a of the umbrella part and radiates the same from an outer peripheral surface 4b of the umbrella part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an LED lamp. Specifically, the present invention relates to an LED lamp capable of obtaining the same size and illumination effect as a conventional halogen lamp with a dichroic mirror.

  A halogen lamp with a dichroic mirror is a lamp that can obtain efficient light in a small size, and is often used as a spotlight.

  In general, a halogen lamp has high illuminance, but has a problem that the lamp itself becomes high temperature due to heat generated by the filament of the light emitting section and emits heat rays. For this reason, there is a problem that it is difficult to use as a spotlight for those who dislike heat. In order to solve the above problem, a halogen lamp with a dichroic mirror in which a dichroic mirror is provided on a reflecting surface in the lamp is often used.

  The dichroic mirror is configured by providing a thin film having the characteristic of reflecting visible light while transmitting invisible light including heat rays such as infrared rays. For this reason, the heat ray radiated | emitted with respect to an irradiated object is reduced. Moreover, since the said reflective surface is provided in the umbrella part internal peripheral surface arrange | positioned so that a light source may be enclosed, while using the said umbrella part as a thermal radiation part, it can radiate | emit the reflected visible light toward the front.

  The dichroic mirror cannot completely reflect only visible light, and a part of visible light is emitted from the outer periphery of the umbrella portion together with the heat rays. When using the halogen lamp with the dichroic mirror as a decorative lamp by using the light emitted from the front of the lamp as a spotlight and using the visible light emitted from the umbrella as the decorative light There are also many.

  As described above, the halogen lamp generates a large amount of heat, and accordingly, the required power increases. For this reason, a lamp (hereinafter referred to as an LED lamp) that can replace the halogen lamp with the dichroic mirror is provided using an LED light emitting element as described in the following patent document.

JP2012-146425A

  The halogen lamp with the dichroic mirror can be used by being directly connected to an AC power supply, like a general incandescent bulb. However, the LED lamp has a low driving voltage and is driven by a direct current. For this reason, when using with the conventional lighting fixture used by connecting with the said commercial power supply, it is necessary to provide the power supply circuit in a lamp | ramp which drops a voltage and rectifies | straightens to direct current.

  However, in the conventional LED lamp, as described in the cited document 1, the power supply circuit is provided in a space between the socket portion for supplying power and the substrate on which the LED light emitting element is mounted. There was a problem that the size was larger than that of a halogen lamp with a dichroic mirror.

  Further, the LED lamp generates less heat rays than the halogen lamp, and when used as a spotlight, the necessity of providing the dichroic mirror is low.

  On the other hand, in the case of use for decoration, it is often required that a part of visible light is radiated from the back surface of the umbrella portion, like a conventional halogen lamp with a dichroic mirror. For this reason, as described in the cited document 1, a part of the light emitted from the LED light emitting element may be emitted from the outer surface of the umbrella part.

  However, conventional halogen lamps with dichroic mirrors emit light by positioning a filament light source in the center of the inner space of the umbrella, whereas LED lamps are planar or point-like LEDs at the base end of the umbrella. A light source is provided, and light is emitted forward from the light source. For this reason, in the LED lamp, the incident angle when light enters the umbrella portion increases, and the amount of light incident on the umbrella portion decreases. In addition, if the incident angle of light with respect to the inner peripheral surface of the umbrella is large, it is often totally reflected. Therefore, in the conventional LED lamp, it is difficult to radiate the same light as the conventional halogen lamp with a dichroic mirror from the back of the umbrella.

  In order to solve the above inconvenience, the invention described in the cited document 1 is configured such that a rod-shaped lens portion protruding in front of the light source is provided and light is also emitted from the side portion of the lens portion. . In addition, the umbrella portion is formed thick and a hemispherical light source is provided, a part of light is introduced into the umbrella portion from the side of the light source, and the umbrella portion is used as a light guide to emit light from the outer surface of the umbrella portion. Is configured to radiate. However, when a rod-shaped lens is provided, the amount of light emitted forward decreases, making it difficult to use as a spotlight. There is also a problem that the weight increases when the thickness of the umbrella portion is increased. For this reason, it has been difficult to obtain the same illumination effect as a conventional halogen lamp with a dichroic mirror.

  The invention of the present application solves the above problems, and can use an AC commercial power supply as it is, as in the conventional halogen lamp with a dichroic mirror, and does not increase the size of the LED lamp. It is an object of the present invention to provide an LED lamp capable of emitting light similar to that of a conventional halogen lamp with a dichroic mirror.

  The present invention includes a substrate provided with a light source configured by arranging a plurality of LED light-emitting elements, an umbrella portion provided so as to surround the substrate, the substrate and the umbrella portion, and heat generated from the substrate. The LED lamp includes a heat radiating member that radiates heat and a socket portion connected to a connection portion of a lighting fixture, and the power supplied from an AC power source is adjusted and supplied to the LED light emitting element on the substrate. A power supply circuit is formed, and the umbrella part is formed in a hollow frustum shape having a wall part made of a light-transmitting material, covers the front opening of the umbrella part, and the umbrella part The inner circumferential surface of the umbrella portion is disposed with a gap, and the light from the light source is emitted forward of the umbrella portion, and part of the light is emitted toward the inner circumferential surface of the umbrella portion, and the outer periphery of the umbrella portion Guides configured to radiate from the surface Configured with the body.

  In this invention, the power supply circuit which adjusts the electric power supplied from AC power supply and supplies it to the said LED light emitting element on the same board | substrate which arranged the LED light emitting element is formed. For this reason, it is not necessary to provide the board | substrate for power supplies which adjusts the electric power supplied to a LED light emitting element separately. Therefore, unlike the conventional LED lamp, it is not necessary to increase the dimension between the socket part and the umbrella part, and the dimension of the LED lamp does not increase. Further, it can be directly connected to a socket or the like of a conventional lighting fixture, and the AC power can be turned on as it is.

  The light guide radiates light from the light source to the front of the umbrella, radiates part of the light toward the inner peripheral surface of the umbrella, and radiates from the outer peripheral surface of the umbrella. It is configured. For this reason, even if it arrange | positions a planar light source in the back of an umbrella part, required light can be radiated | emitted from the outer surface of the said umbrella part.

  In order to increase the amount of light emitted from the LED lamp, it is necessary to mount a large number of LED light emitting elements, and as a result, the area of the light source also increases. However, when the area of the planar light source is increased, a large amount of light is also emitted to the side of the substrate, so that the light use efficiency is deteriorated. Further, it is also conceivable to use the inner peripheral surface of the umbrella portion as a reflection surface as in a conventional dichroic mirror. However, since the light source is disposed at the innermost part of the umbrella portion, the light emitted from the planar LED light source to the inner peripheral surface of the umbrella portion has a large incident angle of light with respect to the surface of the umbrella portion. For this reason, most of the light is reflected forward. For this reason, the amount of light incident on the umbrella portion is reduced, and it is difficult to configure so that required light is emitted from the outer peripheral surface of the umbrella portion.

  In the present invention, by providing the light guide, light emitted from a large planar light source to the side is made incident on the light guide, and refraction and reflection at the light guide interface are used to provide an optical path. It is configured to be able to radiate forward. As a result, it is possible to efficiently use light directed from the light source to the side. Moreover, even if a light source having a large area is used, light can be emitted efficiently toward the front, and a large amount of light can be emitted as compared with a conventional LED lamp.

  Further, a part of the light incident on the light guide body is refracted and emitted toward the inner peripheral surface of the umbrella portion, so that required light can be emitted from the outer peripheral surface of the umbrella portion. For this reason, it becomes possible to comprise the LED lamp which can acquire the illumination effect similar to the conventional halogen lamp with a dichroic mirror.

  The material constituting the substrate is not particularly limited. For example, a ceramic substrate can be used. Further, the form of the substrate is not limited, and a disc-like or rectangular plate-like substrate can be adopted. Wirings constituting the LED light emitting element and the power supply circuit are formed on the substrate by a known technique, and components constituting the LED light emitting element and the power supply circuit are mounted on the wiring by a technique such as chip bonding. Is done. The power supply circuit can be formed on the same surface as the surface on which the LED light emitting element is provided, or can be formed on the back surface side.

  If it is a transparent body, the material which comprises the said umbrella part will not be specifically limited, either. For example, a glass umbrella can be used. In addition, the shape of the umbrella part is not particularly limited as long as it is a hollow frustum shape, for example, a hollow frustum shape having a conical outer peripheral surface or a hollow frustum shape having a pyramidal outer peripheral surface. Can be formed.

  The socket part can be configured to be connected to a socket of a conventional lighting fixture, or a socket having a form for a dedicated lighting fixture can be provided.

  The substrate may include a light emitting element array region configured by arranging a plurality of LED light emitting elements in a predetermined region, and a power circuit region provided with the power circuit for supplying power to the light emitting elements. it can. In the power supply circuit area, a rectifier circuit that rectifies the AC current from the socket part into a waveform for driving the LED light emitting element, a voltage / current adjustment circuit that adjusts to a predetermined voltage and current, and a socket part that extends from the socket part And a connection terminal portion for connecting the wiring. In order to emit uniform light from the surface of the light source, it is preferable that the light emitting element array region and the power supply circuit region are sealed with a fluorescent sealing resin to form a planar light source. Thereby, the big planar light source which can radiate | emit uniform light can be comprised.

  The arrangement form of the light emitting elements and the circuit form of the power supply circuit region are not particularly limited. For example, the power supply circuit region can be arranged on the outer periphery of the light emitting element array region.

  The light guide is entirely formed of a transparent body, and the surface of the umbrella portion is smoothly formed. By forming the surface of the umbrella portion smoothly, the light from the light source can be refracted and / or reflected in the umbrella portion and emitted in a predetermined direction.

  The light guide is formed in the outer peripheral surface of the frustum outer surface facing the inner peripheral surface of the umbrella portion with a predetermined gap, and in the central portion, and a recess having an opening facing the light source and a cylindrical inner surface And a convex lens portion formed at the bottom of the concave portion, and an opening edge portion of the umbrella portion, and forward from a space between the inner peripheral surface of the umbrella portion and the outer peripheral surface of the light guide. It can comprise and comprise the illumination collar part which radiates | emits light toward.

  In the light guide having the above configuration, light is incident on the concave portion from the light source through the opening. Light incident on the recess enters the conductor from the cylindrical inner surface and bottom surface of the recess. Light incident in the axial direction of the lamp from the light source enters the light guide through the convex lens and is refracted in a direction close to the axis to be used as spotlight light. On the other hand, the light incident from the cylindrical inner surface is refracted toward the outer peripheral surface. Since the outer peripheral surface of the light guide is formed in a frustum shape, the light reaching the outer peripheral surface is reflected toward the front, and the light guide is directed toward the inner peripheral surface of the umbrella part. It is split into emitted light.

  The light traveling forward is radiated from the front surface of the light guide as light radiated forward, similarly to the light incident from the lens unit. On the other hand, the light emitted toward the umbrella part passes through the umbrella part and is emitted from the outer peripheral surface of the umbrella part. Moreover, the light reflected from the inner periphery of the umbrella part and the outer peripheral surface is radiated from the illumination collar part.

  By adopting the light guide, light emitted in various directions from a planar light source is split into light emitted forward of the umbrella and light emitted from the outer peripheral surface of the umbrella. The light emitted from the planar light source can be used without waste.

  In order to efficiently use the light from the planar light source, it is preferable to form the recess so as to open over the entire upper and bottom surfaces of the frustum. As a result, most of the light from the light source can be guided to the cylindrical recess and incident into the light guide. Further, in order to increase the amount of light, it is preferable to provide the planar light source over substantially the entire area of the inner surface on the base end side of the umbrella portion. Thereby, it is possible to configure an LED lamp having an unprecedented light emission amount.

  Moreover, if the said recessed part is formed in the whole upper-bottom surface of the said frustum, the edge part of the said recessed part will become a cross-sectional triangle shape. For this reason, light incident on the vicinity of the edge from the light source is split and emitted from the outer periphery of the umbrella by the prism effect due to the triangular cross section. Accordingly, it is possible to emit rainbow-like light from the outer peripheral surface of the umbrella portion.

  It is preferable to provide a predetermined gap between the opening edge of the recess and the light source. When the gap is provided, light emitted from the planar light source in the outermost side, that is, in a direction close to the surface of the planar light source, can be incident on the gap. Part of the light incident on the gap reaches the edge of the umbrella part while being reflected on the outer surface of the light guide and the inner peripheral surface of the umbrella part, and is emitted forward from the illumination collar part. . In addition, in the reflection process, part of the light is emitted from the back of the umbrella, so that the emitted light from the back of the umbrella can be increased. This makes it possible to effectively use the light emitted from the light source to the side.

  The heat radiating member includes a flat substrate mounting portion that holds the substrate via a heat conductive adhesive, and an umbrella portion that is provided on an outer peripheral portion of the substrate mounting portion and to which a base end portion of the umbrella portion is fixed. A connection part, the wiring hole which provided the wiring which connects the said socket part and the said board | substrate, and the thermal radiation part which is provided in a side part outer periphery and accelerates | stimulates heat radiation can be comprised.

  Since the substrate can be directly held on the heat radiating member using a heat conductive adhesive or the like, heat generated in the substrate can be efficiently radiated.

  Further, in the conventional LED lamp, it is necessary to provide a space for accommodating the substrate on which the power supply circuit is provided in the heat radiating member. However, in the present invention, it is sufficient to provide only the wiring hole for providing the wiring. The heat capacity of the member can be set large. For this reason, it becomes possible to constitute a heat radiating member having a high heat radiating effect. Furthermore, heat dissipation can be further promoted by providing a heat dissipation portion that promotes heat dissipation on the outer periphery of the side portion of the heat dissipation member. For example, in order to increase the heat radiation area, a pleated heat radiation portion can be provided.

  A conventional dichroic film can be provided on the inner peripheral surface of the umbrella. By providing the dichroic film, the same illumination effect as that of a conventional halogen lamp with a dichroic mirror can be obtained. Note that the method of providing the dichroic film is not particularly limited, and the dichroic film can be formed using a method similar to that of a conventional halogen lamp. Moreover, the inner peripheral surface of the said umbrella part can be comprised by a polyhedron, and the illumination effect like a mirror ball can also be provided to the light radiated | emitted from the umbrella part outer surface.

  Irregularities for light scattering can be provided on the front surface of the light guide. By providing the unevenness, the light emitted from the front surface of the light guide can be uniformly scattered and emitted.

  In the LED lamp according to the present invention, the light from the light source incident on the light guide is radiated to the front of the umbrella, and a part of the light incident on the light guide is emitted on the inner peripheral surface of the umbrella. And radiate from the outer peripheral surface of the umbrella portion. Further, the light emitted from the gap to the inner peripheral surface of the umbrella part and the outer peripheral surface of the light guide body is changed in direction by reflection of the inner peripheral surface and the outer peripheral surface and radiated forward of the umbrella part. In addition, a part of the light emitted to the inner surface of the umbrella part can be emitted from the outer peripheral surface of the umbrella part. For this reason, by efficiently using the light from the light source, not only can it radiate from the front surface of the light guide and the outer peripheral surface of the umbrella part, but also by changing the angle of the outer peripheral surface of the light guide, The amount of light emitted from the front surface and the outer peripheral surface of the umbrella portion can be easily adjusted.

  An LED lamp that can use a commercial power supply of AC 100V as it is, does not increase the size of the LED lamp, and can emit the same light as a conventional halogen lamp with a dichroic mirror from the back of the umbrella. Can be provided.

It is a front external view of the LED lamp which concerns on this invention. It is sectional drawing which follows the II-II line in FIG. It is sectional drawing which follows the III-III line in FIG. It is a top view of the LED lamp shown in FIG. It is a bottom view of the LED lamp shown in FIG. It is an expanded sectional view of the important section showing the optical path of light. It is an expanded sectional view of the important section showing the optical path of light. It is a figure explaining a prism effect. It is a circuit diagram which shows schematic structure of a power supply circuit. It is a top view which shows the structure of a board | substrate typically. It is sectional drawing which shows the structure of a board | substrate typically.

  Embodiments of the present invention will be specifically described below with reference to the drawings. In addition, although this embodiment applied this invention to the LED lamp provided with the truncated cone-shaped umbrella part and the screw-in type socket part, this invention is applied to the LED lamp provided with the umbrella part and socket of another form. You can also

  As shown in FIGS. 1 and 2, the LED lamp 1 according to the present embodiment includes a substrate 3 provided with a planar light source 2, an umbrella portion 4 provided so that a base end portion surrounds the substrate 3, and While holding the said board | substrate 3 and the said umbrella part 4 in one end part, the heat radiating member 6 which provided the socket part 5 connected to a lighting fixture in the other end part, and the light guide 7 provided in the said umbrella part 4 And is configured.

  The said board | substrate 3 and the said umbrella part 4 are hold | maintained at the said heat radiating member 6 via the heat conductive adhesive. The socket portion 5 includes a screw contact portion 5b in which a screw is formed on an outer peripheral surface of a cylindrical metal, a press contact portion 5a provided at a tip portion of the socket portion 6, the screw contact portion 5b, and the press contact. And a conical insulator 5c provided between the portions 5a. The socket portion 5 is configured to be connected to a connection portion of a lighting device on which a conventional halogen lamp with a dichroic mirror or the like is mounted. In addition, the form of the said socket part 5 is not limited to this Embodiment, It can change according to a lighting fixture.

  The umbrella portion 4 according to the present embodiment is formed of a glass material, and has a truncated cone-shaped back surface (outer peripheral surface) and an inner peripheral surface. In order to obtain the same illumination effect as that of a conventional halogen lamp with a dichroic mirror, a dichroic mirror can be formed on the inner peripheral surface of the umbrella.

  The heat dissipating member 6 is integrally formed of a ceramic material as a whole, and is provided on a flat substrate holding portion 6a for holding the substrate 3 and an outer peripheral portion of the substrate holding portion 6a, and connects the umbrella portion 4 to each other. A cylindrical outer surface connecting portion 6b, a through hole in the axial direction, wiring holes 6c through which wires 8 and 9 are supplied from the socket portion 5 to the substrate 3, and side portions A pleated heat dissipating portion 6d provided on the outer periphery, and a diametrical wiring groove 6e communicating with the wiring hole 6c and extending to the edge of the substrate 3 to connect the wiring 9 to the substrate 3 are provided. Configured.

  The light guide 7 is entirely formed of a transparent acrylic resin, and the entire surface of the umbrella 4 is smoothly formed. The light guide 7 is formed on the outer peripheral surface 7a of the frustoconical outer surface facing the umbrella inner peripheral surface 4a with a predetermined gap, the opening 7b facing the light source 2 and the cylinder. A concave portion 7d having an inner surface 7c, a convex lens portion 7e formed at the bottom of the concave portion 7d, and an opening edge portion 4c of the umbrella portion 4, and the umbrella portion inner peripheral surface 4a and the light guide. An illumination collar portion 7f that emits light forward from the space 10 between the outer peripheral surface 7a of the body 7 and

  As shown in FIGS. 9 and 10, the light source 2 is configured by arranging a plurality of LED light emitting elements 15 on the substrate 3. In the present embodiment, the substrate 3 is formed in a disc shape, and a light emitting element array region 11 in which the light emitting elements 15 are arrayed in a circular region in the center is provided. In addition, an annular power supply circuit region 12 provided with a power supply circuit 13 for supplying power to the light emitting element 15 is formed on the outer periphery of the light emitting element array region 11.

  As shown in FIG. 9, the power supply circuit 13 includes a bridge rectifier circuit 16 that rectifies 100V AC commercial current into DC, and a voltage / current adjuster circuit 17 that adjusts to a required voltage and current. Yes. By connecting a commercial AC power supply 38 to the connection terminal of the bridge rectifier circuit 16, a required DC current flows through each LED light emitting element 15 provided in the light emitting element array region 11.

  As shown in FIG. 10, the power supply circuit region 12 is provided in an annular region on the outer periphery of the light emitting element array region 11, and adjusts the surge absorbing element 40, the diode 42 constituting the rectifier circuit, and the current / voltage. Electronic parts such as the voltage / current adjusting element 41 are mounted in this region, and connection terminal portions 18 and 19 for connecting the wirings 8 and 9 from the socket portion 5 are provided in the vicinity of the edge portion of the substrate 3. Yes. The power supply circuit 12 and the components (elements) constituting the power supply circuit 12 are not limited to those described above, and various power supply circuits and components can be employed.

  As shown in FIG. 11, the light emitting element array region 11 and the power supply circuit region 12 are sealed with a fluorescent sealing resin 20, and the surface light source 2 that uniformly emits light on the surface of the fluorescent sealing resin 20. Is configured.

  The light emission mode of the LED lamp having the above configuration will be described with reference to FIGS.

  The light source 2 according to the present embodiment is a planar light source configured by arranging a plurality of LED light emitting elements 15. For this reason, light is emitted from the light source 2 in all forward directions.

  As shown in FIG. 6, the light source 2 is set slightly larger than the opening 7 b of the recess 7 d of the light guide 7. For this reason, most of the light emitted from the light source 2 is introduced into the light guide 7 from the convex lens portion 7e introduced into the concave portion 7d and provided on the cylindrical inner surface 7c or the bottom surface.

  FIG. 6 shows an outline of an optical path incident on the concave portion 7d. FIG. 7 shows an outline of an optical path of light radiated between the inner peripheral surface 4a of the umbrella 4 and the outer peripheral surface 7a of the light guide 7 from the gap between the concave portion 7d and the light guide 7. .

  The light 51 traveling in the axial direction of the LED lamp is emitted from the front surface 28 of the light guide as light converged in a predetermined direction at the convex lens portion 7e provided at the bottom of the concave portion 7d.

  The light 52 traveling from the vicinity of the outer periphery of the light source 2 toward the cylindrical inner surface 7c has a small incident angle with respect to the cylindrical inner surface 7c. The light 52a incident on the light guide 7 from the cylindrical inner surface 7c is refracted in a direction in which the incident angle with respect to the inner peripheral surface 4a of the umbrella portion 4 is reduced. The light reaching the conical boundary surface of the light guide body 7 is partially reflected by the light 52d, and part of the light 52b is emitted from the outer peripheral surface 7a of the light guide body 7 It goes to the inner peripheral surface 4a of the umbrella part 4. And it becomes the light 52c which passes the said umbrella part 4 and is radiated | emitted from the umbrella part outer peripheral surface. On the other hand, the light 52d traveling forward is radiated from the front surface 28 of the light guide 7 together with the light 51 traveling in the axial direction of the lamp.

  Since the outer peripheral surface 7a of the light guide 7 is formed in a conical outer surface, the light 52a traveling through the light guide 7 has a long optical path in the light guide, and the light 52b emitted from the light guide 7. Is emitted so as to go to the back (back side) of the inner circumferential surface 4a of the umbrella portion as compared with the case where the light guide 7 is not provided. Further, the optical path is changed so that the incident angle with respect to the inner peripheral surface 4a of the umbrella part 4 is reduced. For this reason, the amount of light incident on the umbrella 4 increases. Thereby, the light from the planar light source 2 can be efficiently emitted from the outer peripheral surface 4 b of the umbrella portion 4. Further, by adjusting the angle of the conical outer peripheral surface 7a of the light guide 7, the amount of light emitted from the outer peripheral surface 4b of the umbrella 4 and the amount of light emitted in the axial direction of the lamp can be adjusted. It becomes possible.

  Further, as shown in FIG. 7, in this embodiment, a predetermined gap H is provided between the light source 2 and the opening 7 b of the light guide 7.

  When the gap H is provided, the light 53 radiated from the light source 2 in the outermost side, that is, in a direction close to the light emitting surface of the light source 2, is transmitted from the gap H to the inner peripheral surface 4 a of the umbrella part 4 and the It is emitted between the outer peripheral surface 7 a of the light guide 7. The light 53 from the gap H has an increased incident angle with respect to the inner peripheral surface 4a of the umbrella part 4 and the amount of light 53a reflected on the inner peripheral surface 4a increases, while entering the umbrella part 4. Thus, the amount of light 53b emitted from the outer peripheral surface 4b is reduced. In particular, when approaching the opening edge 4c of the umbrella part 4, most of the light is reflected forward. Further, since the light source 2 is formed in an area larger than the opening 7b of the light guide 7, the light 54 radiated from the vicinity of the outer periphery of the light source 2 through the gap H is the light guide 7. Also emitted toward the outer peripheral surface 7a. On the outer peripheral surface 7a of the light guide 7, the incident angle of the light 54 is larger than the critical angle, so that the reflected light 54a is obtained by totally reflecting the light. As a result, the light radiated from the gap H to the inner peripheral surface 4a of the umbrella 4 and the space 10 in the outer peripheral surface 7a of the light guide 7 is guided to the illumination collar 7f while being reflected by these surfaces. As a result, the light 54b is emitted from the front surface of the light guide 7. Thereby, it becomes possible to direct the light which goes to the side of the light guide 7 to the front efficiently, and the light radiated | emitted from the said light source 2 can be utilized efficiently.

  Further, as shown in FIG. 8, the vicinity of the edge 7g of the opening 7b of the light guide 7 according to the present embodiment is formed in a substantially triangular shape in cross section. For this reason, the light 55 incident on the light guide 7 from the opening 7b is split by the prism effect. That is, red light 55a having a long wavelength is refracted axially rearward, and blue to green light 55b having a short wavelength is refracted axially forward. For this reason, the color effect which added the rainbow-like color to the outer peripheral surface 4b of the said umbrella part 4 can also be provided.

  In the embodiment shown in FIGS. 6 and 7, the front surface 28 of the light guide 7 is a smooth surface. However, as shown in FIG. 8, unevenness 28 a is provided to scatter light emitted from the front surface. It can also be configured to radiate.

  The scope of the present invention is not limited to the embodiment described above. The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  The LED lamp which can be used similarly to the conventional halogen lamp with a dichroic mirror can be provided.

DESCRIPTION OF SYMBOLS 1 LED lamp 2 Light source 3 Board | substrate 4 Umbrella part 4a Inner peripheral surface 4b Umbrella part outer peripheral surface 4c Opening edge part 5 Socket part 5a Press contact part 5b Screw contact part 5c Insulator 6 Heat radiation member 6a Substrate holding part 6b Umbrella Part connection part 6c Wiring hole 6d Heat radiation part 6e Wiring groove 7 Light guide 7a Outer peripheral surface 7b Opening part 7c Cylindrical inner surface 7d Recess 7e Lens part 7f Illumination lamp part 7g Edge part 8 Wiring 9 Wiring 11 Light emitting element arrangement area 12 Power supply circuit area DESCRIPTION OF SYMBOLS 15 LED light emitting element 16 Bridge rectifier circuit 17 Voltage / current adjustment circuit 18 Connection terminal part 19 Connection terminal part 20 Fluorescent sealing resin 28 Front surface of a light guide 28a Concavity and convexity 38 Commercial alternating current power supply 40 Surge absorption element 41 Element 42 Diode 51 Light directed in the axial direction of the LED lamp 51b Light directed in the axial direction of the LED lamp 52a Light guide Incident light 52b Light emitted from the light guide 52c Light emitted from the outer peripheral surface of the umbrella portion 52d Light directed in the axial direction of the LED lamp 53 Light emitted in the direction close to the light emitting surface 53a Reflected by the inner peripheral surface of the umbrella portion 53b Light emitted from the outer peripheral surface of the umbrella portion 54 Light emitted from the vicinity of the outer periphery of the light source 54a Reflected light 54b Light emitted forward 54 Light incident from the vicinity of the edge of the opening 55a Red light having a long wavelength 55b Blue-green light with short wavelength H Clearance

Claims (10)

A substrate provided with a planar light source configured by arranging a plurality of LED light emitting elements, an umbrella portion provided so as to surround the substrate, the substrate and the umbrella portion, and heat generated from the substrate. An LED lamp comprising a heat dissipating member for dissipating heat and a socket part connected to a connection part of a lighting fixture,
On the substrate, a power supply circuit for adjusting the power supplied from the AC power source and supplying the LED light emitting element is formed.
The umbrella part is formed in a hollow frustum shape having a wall part made of a light transmissive material,
Covering the front opening of the umbrella part and being spaced from the circumferential inner surface of the umbrella part, radiates light from the light source to the front of the umbrella part, and a part of the light of the umbrella part An LED lamp comprising a light guide configured to radiate toward an inner peripheral surface and radiate from an outer peripheral surface of the umbrella portion. The light guide is entirely formed of a transparent body, and the surface of the umbrella is formed smoothly.
An outer peripheral surface of a frustum outer surface facing the inner peripheral surface of the umbrella portion with a predetermined gap therebetween;
A recess formed in the center and having an opening facing the light source and a cylindrical inner surface;
A convex lens portion formed at the bottom of the concave portion;
2. An illumination collar that is coupled to an opening edge of the umbrella and that emits light forward from a space between the inner circumferential surface of the umbrella and the outer circumferential surface of the light guide. LED lamp described in 1. The substrate includes a light emitting element arrangement area configured by arranging a plurality of LED light emitting elements in a predetermined area, and a power supply circuit area provided with the power supply circuit for supplying power to the light emitting element,
In the power supply circuit area, a rectifier circuit that rectifies the AC current from the socket part into a waveform for driving the LED light emitting element, a voltage / current adjustment circuit that adjusts to a predetermined voltage and current, and a socket part that extends from the socket part. A connection terminal for connecting the wiring is formed, and
The LED lamp according to claim 1 or 2, wherein the light source is formed by sealing the light emitting element array region and the power supply circuit region with a fluorescent sealing resin.   4. The LED lamp according to claim 2, wherein the recess is formed so as to open over the entire area of the upper bottom surface of the frustum. 5.   The LED lamp according to any one of claims 2 to 4, wherein a predetermined gap is provided in an axial direction between an opening edge of the concave portion and the light source.   The LED lamp according to any one of claims 2 to 5, wherein the light source is formed to be at least larger than the opening. The heat dissipation member is
A flat substrate mounting portion for holding the substrate via a thermally conductive adhesive;
An umbrella connecting portion provided on an outer peripheral portion of the board mounting portion and to which a base end portion of the umbrella is fixed;
A wiring hole provided with a wiring connecting the socket part and the substrate;
The LED lamp of any one of Claims 1-6 provided with the thermal radiation part which is provided in a side part outer periphery and accelerates | stimulates thermal radiation.   The LED lamp according to claim 1, wherein a dichroic film is provided on the inner peripheral surface of the umbrella part.   The LED lamp according to any one of claims 1 to 8, wherein unevenness for light scattering is provided on a front surface of the light guide. A substrate provided with a planar light source configured by arranging a plurality of LED light emitting elements, an umbrella portion provided so as to surround the substrate, the substrate and the umbrella portion, and heat generated from the substrate. An illumination method for an LED lamp comprising a heat dissipating member for dissipating heat and a socket part connected to a connection part of a lighting fixture,
A light guide body is provided that covers the front opening of the umbrella part and provides an outer peripheral surface of a frustum outer surface facing the inner peripheral surface of the umbrella part with a predetermined gap therebetween,
The light from the light source incident on the light guide is radiated forward of the umbrella part, and part of the light incident on the light guide is radiated toward the inner peripheral surface of the umbrella part. While radiating from the outer surface,
The light emitted from the gap to the inner peripheral surface of the umbrella portion and the outer peripheral surface of the light guide is changed in direction by reflection of the inner peripheral surface and the outer peripheral surface and radiated forward of the umbrella portion. An illumination method for an LED lamp, wherein a part of light emitted to the inner surface of the umbrella part is emitted from an outer peripheral surface of the umbrella part.

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