JP2018152177A - Light emitting diode lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting diode lamp capable of radiating light from a light emitting diode which radiates light of a plurality of kinds of wavelengths at a desired degree of diffusing and mixing without greatly lowering light volume.SOLUTION: A light emitting diode lamp 10 is constituted by: a light emitting diode 34 including a light emitting diode element 42 for radiating light of a predetermined wavelength and another light emitting diode element 42 for radiating light of wavelength different from the wavelength; a meniscus lens 36 for refracting light from the light emitting diode 34; and a plane surface diffuser 38 which has a light incident surface 38a and a light emission surface 38b facing the light incident surface 38a, which diffuses and mixes the light from the light emitting diode 34 which has entered the light incident surface 38a and radiates it from the light emission surface 38b, and which is arranged in the vicinity on a light incident surface 36a side of the meniscus lens 36.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light emitting diode lamp including a light emitting diode composed of a plurality of light emitting diode elements, and a meniscus lens that refracts light emitted from the light emitting diode.

  Compared to conventional incandescent lamps (for example, halogen lamps), light-emitting diodes that have the advantages of lower power consumption and longer service life are rapidly used as an energy-saving measure as consumers become more eco-conscious. It has spread to.

  As one of the range of use, a technology has been developed in which a plurality of light emitting diode elements having different emission colors are combined to form a light emitting diode so that light of a desired color can be emitted as the light emitting diode. (For example, patent document 1).

  In the light emitting diode lamp described in Patent Document 1, light emitting diode elements that radiate light of three primary colors of red, blue, and green are combined to form a light emitting diode. Therefore, the light emitting diode is sealed with a transparent hemispherical sealing resin containing a diffusing material.

JP 2006-237282 A

  By the way, when it is going to deliver the light from a light emitting diode to a desired distance with a desired condensing degree, the light from a light emitting diode is reflected on the reflective surface of a reflecting mirror using a reflecting mirror (reflector). Become. In particular, when the light from the light emitting diode is to be delivered far away, a reflecting mirror whose reflecting surface is a parabolic surface is used. The rotating paraboloid has one focal point, and after being emitted from this focal point, the light reflected by the rotating paraboloid emerges from the reflecting mirror as parallel light parallel to each other.

  In order to illuminate the object with the light collected from the light-emitting diode with a desired degree of light collection, of course, when using the reflector as described above, and without using the reflector, the light-emitting diode and the object are used. It is generally performed that a lens is arranged between and (when a reflecting mirror is used, between a light emitting diode and a reflecting surface), and the light from the light emitting diode is refracted by the lens.

  However, when combined with the lens in this way, the light emitting diode lamp described in Patent Document 1 has a problem. That is, as shown in FIG. 10, in the light-emitting diode lamp described in Patent Document 1, a transparent hemispherical sealing resin 101 containing a diffusing material 100 to mix three primary color lights into white light. The light emitting diode 102 is sealed. For this reason, the light L from each light-emitting diode element 104 is diffused in various directions by the diffusing material 100 in the sealing resin 101 (stray light), and the amount of light that illuminates the light receiving surface 112 of the lens 110 is related to the sealing. Compared with the case where the resin 101 is not used, it is greatly reduced.

  The present invention has been developed in view of such problems of the prior art. Therefore, the main problem of the present invention is to suppress the light from the light emitting diode that emits light of plural kinds of wavelengths from becoming stray light, and to radiate it with a desired degree of diffusion mixing without greatly reducing the light amount. An object of the present invention is to provide a light emitting diode lamp.

(1)
According to one aspect of the present invention,
A light emitting diode including a light emitting diode element that emits light of a predetermined wavelength and another light emitting diode element that emits light of a wavelength different from the wavelength; and
A meniscus lens that refracts light from the light emitting diode;
The entrance of the meniscus lens has a light incident surface and a light emitting surface opposite to the light incident surface, and diffuses and mixes light from the light emitting diode that has entered the light incident surface and emits the light from the light emitting surface. There is provided a light emitting diode lamp comprising a planar diffuser disposed in the vicinity of the light surface side.

(2)
Preferably, the apparatus further includes a reflecting mirror formed on the inside with a reflecting surface defined by a rotating surface having an aperture and a focal point, and the light from the light emitting diode housed inside the reflecting mirror is the planar diffuser. And after passing through the meniscus lens, the light is reflected by the reflecting surface and exits from the opening.

(3)
Preferably, the meniscus lens forms a virtual image of the light emitting diode at the focal point position of the reflecting surface behind the light emitting diode, assuming that the planar diffuser does not exist.

  According to the present invention, the planar diffuser is disposed in the vicinity of the light incident surface side of the meniscus lens, and the sealing material contains a diffusing material in order to mix light having different wavelengths emitted from a plurality of light emitting diode elements. There is no need to seal the light emitting diode with the resin for use. Accordingly, the light incident surface of the planar diffuser can be directly illuminated with the light without diffusing the light emitted from the light emitting diode and making a part of the light stray light. In addition, the light entering the planar diffuser from the light incident surface is diffused and mixed and exits from the light emission surface. However, since the light entrance surface of the meniscus lens exists near the light emission surface, the light emission surface Almost all the light emitted from the light enters the meniscus lens from the light incident surface. That is, it is possible to put most of the light into the meniscus lens while diffusing and mixing the light emitted from the light emitting diode without making it stray light.

  As described above, according to the present invention, light having different wavelengths is mixed with a predetermined degree of diffusion to obtain desired light, while the amount of light entering the lens is greatly reduced as in a conventional light emitting diode lamp. It was possible to provide a light emitting diode lamp capable of avoiding a significant decrease in the amount of light that illuminates an object due to an increase in stray light.

1 is a cross-sectional view showing a first embodiment of a light-emitting diode lamp 10 to which the present invention is applied. 1 is a front view showing a first embodiment of a light emitting diode lamp 10 to which the present invention is applied. It is a perspective view which shows 1st Example of the light emitting diode light source 14 with which this invention was applied. It is sectional drawing which shows 1st Example of the light emitting diode light source 14 with which this invention was applied. 3 is a diagram illustrating an example of a light emitting diode 34. FIG. 2 is a diagram illustrating an example of a light emitter 30. FIG. It is sectional drawing which shows the light emitting diode light source 14 of the state which removed the planar diffuser 38. FIG. It is a figure which shows the optical path of the light L emitted from the light emitting diode element 42 of the light emitting diode lamp 10 with which this invention was applied. It is sectional drawing which shows 2nd Example of the light emitting diode lamp 10 with which this invention was applied. It is a figure which shows the optical path of the light L emitted from the light emitting diode element 104 of the light emitting diode lamp in a prior art.

  Hereinafter, an embodiment (first embodiment) of the light-emitting diode lamp 10 to which the present invention is applied will be described. As shown in FIGS. 1 and 2, the light-emitting diode lamp 10 is generally composed of a bowl-shaped reflecting mirror 12 and a light-emitting diode light source 14.

  The reflecting mirror 12 includes a reflecting surface 20 formed inside thereof, an opening 22 that emits light reflected by the reflecting surface 20, and a substantially cylinder provided at the center of the bottom of the reflecting surface 20 at a position facing the opening 22. And a central mounting cylinder portion 24 having a shape. A straight line passing through the center of the reflecting mirror 12 and orthogonal to the opening 22 is defined as a central axis C of the reflecting mirror 12 (and the reflecting surface 20).

  As the material of the reflecting mirror 12, glass, aluminum, or the like is used. In the case of aluminum, metal deposition is performed on the reflecting surface 20. In the case of glass, in addition to metal deposition, the reflective surface 20 of the multilayer film is included in the bowl-shaped portion. It is formed on the surface (that is, the surface on which the reflection surface 20 is formed). In particular, in the light-emitting diode lamp 10, heat from the light-emitting diode 34 (described later) constituting the light-emitting diode light source 14 is efficiently dissipated by the support column 32 (described later), so that it is weaker than heat than glass or aluminum. Resin or the like can also be used as a material for the reflecting mirror 12. In this embodiment, a polycarbonate front cover 26 that covers the opening 22 of the reflecting mirror 12 is attached, but the front cover 26 is not an essential component of the light-emitting diode lamp 10. Moreover, if it is a transparent material, other materials, such as glass, can be used as the material of the front cover 26.

  The reflecting surface 20 is defined by the above-described rotating surface centered on the central axis C, and the focal point F is set on the central axis C inside the reflecting mirror 12. The position of the focal point F is set to an optimum position based on factors such as the size and number of the light emitting diodes 34 accommodated inside the reflecting mirror 12. For example, when the light emitting diode 34 is large or the number of the light emitting diodes 34 is large, the position of the focal point F is set at a slight distance from the bottom of the reflecting surface 20, and conversely, the light emitting diode 34 is small or emits light. When the number of the diodes 34 is small, the position of the focal point F is set closer to the bottom of the reflecting surface 20. When the rotating surface that defines the reflecting surface 20 is a spheroid or rotating paraboloid, the focal point of the ellipse or parabola that defines these is the focal point F of the reflecting surface 20.

  Referring to FIG. 3 in addition to FIGS. 1 and 2, the light-emitting diode light source 14 includes four light emitters 30 and support columns 32 that hold these at predetermined positions. Note that the number of the light emitters 30 is not limited to four, and only one light emitter 30 may be used as in a second embodiment described later, or a plurality of light emitters 30 may be used.

  As illustrated in FIG. 4, the light emitter 30 includes a light emitting diode 34, a meniscus lens 36, a planar diffuser 38, and a lens holding member 40. The four light emitters 30 used in the present embodiment are arranged around the focal point F of the reflecting surface 20 at the tip end of a substantially quadrangular columnar pillar 32 extending from the bottom of the reflecting surface 20 along the central axis C. They are arranged radially at equal intervals in the direction.

  As shown in FIG. 5, the light emitting diode 34 includes a plurality of light emitting diode elements 42. In the present embodiment, one light emitting diode 34 is formed by arranging nine light emitting diode elements 42 in a grid pattern. The number of light emitting diode elements 42 constituting the light emitting diode 34 is not limited to this, and one light emitting diode 34 may be configured by two or more light emitting diode elements 42.

  The light emitting diode element 42 is an electronic component that emits light of a specific wavelength at a light emission angle of 120 ° (the light emission angle θ is not limited to this, of course) by flowing a predetermined current. In this embodiment, there are at least two types of wavelengths of light emitted from the plurality of light emitting diode elements 42 constituting one light emitting diode 34. For example, although nine light emitting diode elements 42 are used in the light emitting diode 34 of this embodiment, any one of these nine light emitting diode elements 42 is a set. That is, the light emitting diode 34 of the present embodiment is composed of three sets of light emitting diode elements 42. Light of the same wavelength is emitted from the light emitting diode elements 42 belonging to the same set, and the wavelengths of light from the light emitting diode elements 42 belonging to different sets are different from each other. . Of course, the present invention is not limited to this, and light of the same wavelength is emitted from any of the seven light emitting diode elements 42, and light of different wavelengths is emitted from the remaining two light emitting diode elements 42. It may be. Furthermore, the nine light emitting diode elements 42 may emit light having nine different wavelengths.

  As for the wavelength of the light emitted from each light emitting diode element 42, light having any wavelength such as ultraviolet light, visible light, or infrared light may be combined. For example, three types of visible light such as red, blue, and green can be combined, and a plurality of types of infrared light having different wavelengths can be combined.

  Referring to FIG. 6 in addition to FIG. 1 and FIG. 4, the meniscus lens 36 is a convex meniscus lens (made of polycarbonate) disposed between the light emitting diode 34 and the reflecting surface 20 so as to face and separate from the light emitting diode 34. A lens having a substantially strip-shaped cross section, one surface being a convex surface and the other surface being a concave surface), and refracting the light emitted from the light emitting diode 34 toward the reflecting surface 20, This is an optical component that forms a virtual image I of the light emitting diode 34 behind the light emitting diode 34. Of course, the material of the meniscus lens 36 is not limited to polycarbonate, and materials such as glass can be used.

  In addition to the convex meniscus lens, a plano-convex lens or a biconvex lens can be used. However, light from the light emitting diode 34 that enters the left and right ends of the meniscus lens 36 is reflected by the incident surface of the meniscus lens 36. It is preferable to use a convex meniscus lens because it tends to be stray light.

  The planar diffuser 38 is a plate-like member having a light incident surface 38a and a light emitting surface 38b, and light entering the light incident surface 38a is diffused and scattered and emitted from the light emitting surface 38b. ing. The planar diffuser 38 is disposed in the vicinity of the meniscus lens 36 on the light incident surface 36a side. The “near the light incident surface 36 a” is a concept including a state in which a part of the light emitting surface 38 b of the planar diffuser 38 is in contact with the bottom surface 37 of the meniscus lens 36 on the light incident surface 36 a side.

  By the way, in this embodiment, the virtual image I of the light emitting diode 34 formed by the meniscus lens 36 in each light emitter 30 is assumed to have a geometrical shape as shown in FIG. The center is set to be located at the focal point F on the reflecting surface 20. As a means for setting the virtual image I at such a position, the position of the virtual image I may be optically adjusted by adjusting the refractive index of the meniscus lens 36. Or you may adjust the cross-sectional dimension of the support | pillar 32. FIG. As the cross-sectional dimension of the column 32 is reduced, the position of the virtual image I moves away from the focal point F. Conversely, as the cross-sectional dimension is increased, the position of the virtual image I approaches the focal point F. Of course, you may use both together.

  Returning to FIG. 1, FIG. 4, and FIG. 6, the lens holding member 40 is an annular body formed of metal, opaque resin, translucent resin, or the like, and surrounds the light emitting diode 34 at one end thereof. Is attached to the surface of the support column 32, and a planar diffuser 38 and a meniscus lens 36 are fitted in this order into a step 41 formed at the other end. The meniscus lens 36 and the lens holding member 40 may be integrally formed with each other, but in that case, the planar diffuser 38 needs to be disposed at an appropriate position.

  When the lens holding member 40 is formed of a metal or an opaque resin, there is also light emitted from the light emitting diode 34 and reflected to the inner surface of the lens holding member 40 and then radiated to the outside through the planar diffuser 38 and the meniscus lens 36. However, such light is also a kind of stray light and does not become effective light for illuminating the object, which causes a reduction in the amount of light.

  When the lens holding member 40 is formed of a translucent resin, most of the light is reflected from the inner surface of the lens holding member 40 and then radiated to the outside through the planar diffuser 38 and the meniscus lens 36. The light is emitted to the outside as stray light through the lens holding member 40 made of translucent resin.

  The support column 32 is a quadrangular prism material (for example, light emitting material) made of aluminum (other material such as copper may be used as long as the material has high thermal conductivity) extending from the bottom of the reflecting surface 20 along the central axis C. If the number of the bodies 30 is three, it is preferable to use a triangular prism material, and if it is five, it is preferable to use a pentagonal column material. Centered on the focal point F, they are arranged radially at equal intervals in the circumferential direction.

  Thus, since the support | pillar 32 is formed with aluminum with high heat conductivity, the heat | fever generate | occur | produced simultaneously with the light emitting diode 34 light-emitting can be rapidly received from the light emitting diode 34 now. That is, the support column 32 not only simply holds the light emitting diode 34 and the meniscus lens 36 but also has a role as a heat dissipation material of the light emitting diode 34. Further, the other end of the support column 32 is inserted into the central mounting cylinder 24 of the reflecting mirror 12 and then bonded to the reflecting mirror 12 with a silicon-based adhesive or the like (FIG. 1).

  Power supply members 44 for supplying power to the light emitting diodes 34 are disposed on the four side surfaces of the support column 32 (FIG. 4), and power is supplied to the light emitting diodes 34 through the power supply members 44. Yes. In this embodiment, since the support column 32 is made of aluminum, it is necessary to insulate the support column 32 and the power feeding member 44. Note that power is supplied to the power supply member 44 from an external power source (not shown) via a lead wire (not shown). Further, power may be directly supplied to the light emitting diode 34 using a lead wire.

  The light emitting diode lamp 10 is manufactured according to the following procedure as an example. After the light emitting diode 34 is bonded to the support 32, the light emitting diode 34 and the power supply member 44 are mounted by electrical connection. And after arrange | positioning the lens holding member 40 around the light emitting diode 34, the planar diffuser 38 and the meniscus lens 36 are each attached. Thereafter, the support column 32 is inserted into the central mounting cylinder 24 of the reflecting mirror 12, and fixed at a predetermined position with a silicon adhesive or the like.

  When the power supply member 44 of the light-emitting diode lamp 10 manufactured in this way is energized, the light-emitting diode 34 is energized via the power supply member 44, and the light-emitting diode 34 emits light. The light emitted from the light emitting diode 34 is diffused and mixed by the planar diffuser 38 and then condensed by the meniscus lens 36. The light emitted from the meniscus lens 36 is reflected by the reflecting surface 20 and then exits from the light emitting diode lamp 10 through the front cover 26 provided in the opening 22.

(Characteristics of the light-emitting diode lamp 10 in this embodiment)
According to the light emitting diode lamp 10 of the present embodiment, as shown in FIG. 8, the planar diffuser 38 is disposed in the vicinity of the light incident surface 36 a side of the meniscus lens 36, and is emitted from the plurality of light emitting diode elements 42. It is not necessary to seal the light emitting diode 34 with a sealing resin containing a diffusing material in order to mix light having different wavelengths. Accordingly, the light incident surface 38a of the planar diffuser 38 can be directly illuminated with the light L without diffusing the light L emitted from the light emitting diode 34 and making a part of the light L as stray light. In addition, light that has entered the planar diffuser 38 from the light incident surface 38a is diffused and mixed and exits from the light emitting surface 38b. However, the light incident surface 36a of the meniscus lens 36 exists in the vicinity of the light emitting surface 38b. For this reason, almost all light emitted from the light emitting surface 38b enters the meniscus lens 36 from the light incident surface 36a. That is, most of the light can be put into the meniscus lens 36 while diffusing and mixing the light emitted from the light emitting diode 34 without making it stray light.

  As described above, according to the light-emitting diode lamp 10 of the present embodiment, the planar diffuser 38 mixes light having different wavelengths with a predetermined diffusion degree, thereby obtaining desired light and greatly increasing the amount of light that illuminates the object. It is possible to avoid a decrease.

(Second embodiment)
In the first embodiment described above, the light emitting diode lamp 10 in which the four light emitters 30 are disposed on the inner surface of the reflecting mirror 12 has been described. However, the present invention does not use the reflecting mirror 12 and the light emitter 30 has the following structure. The present invention can also be applied to one light emitting diode lamp 10. Hereinafter, “the light emitting diode lamp 10 without using the reflecting mirror 12 and having one light emitter 30” will be briefly described as a second embodiment. In addition, about the same thing as the content demonstrated in 1st Example, the same reference number is used and description in 1st Example is used without repeating in description of 2nd Example.

  As shown in FIG. 9, the light emitting diode lamp 10 of the second embodiment is composed of only the light emitting diode light source 14. In addition, the light emitting diode light source 14 includes the single light emitter 30 and the support column 32 as described above. In the case of the present embodiment, the light emitter 30 is disposed on the front end surface of the prismatic column 32, but may be disposed on the other surface of the column 32 depending on the application of the light-emitting diode lamp 10 or the like. . Further, the shape of the support column 32 is not limited to a prism, such as a cylinder.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 ... Light emitting diode lamp, 12 ... Reflector, 14 ... Light emitting diode light source, 20 ... Reflecting surface, 22 ... Opening, 24 ... Center mounting cylinder part, 26 ... Front cover, 30 ... Light emitter, 32 ... Strut, 34 ... Light emission Diode, 36 ... meniscus lens, 37 ... (bottom surface of meniscus lens 36), 38 ... plane diffuser, 40 ... lens holding member, 41 ... step (in lens holding member), 42 ... light emitting diode element, 44 ... power feeding member DESCRIPTION OF SYMBOLS 100 ... Diffusing material, 101 ... Resin for sealing, 102 ... Light emitting diode, 104 ... Light emitting diode element, 110 ... Lens, 112 ... Light-receiving surface (of lens 110) C ... Central axis, I ... Virtual image, L ... Light

Claims (3)

A light emitting diode including a light emitting diode element that emits light of a predetermined wavelength and another light emitting diode element that emits light of a wavelength different from the wavelength; and
A meniscus lens that refracts light from the light emitting diode;
The entrance of the meniscus lens has a light incident surface and a light emitting surface opposite to the light incident surface, and diffuses and mixes light from the light emitting diode that has entered the light incident surface and emits the light from the light emitting surface. A light-emitting diode lamp comprising a planar diffuser disposed in the vicinity of the light surface side. And further comprising a reflecting mirror formed on the inside with a reflecting surface defined by a rotating surface having an aperture and a focal point,
The light from the light emitting diode housed inside the reflecting mirror passes through the planar diffuser and the meniscus lens, and then is reflected by the reflecting surface and exits from the opening. Light emitting diode lamp.   The said meniscus lens forms the virtual image of the said light emitting diode in the position of the said focus of the said reflective surface in the back of the said light emitting diode, when it assumes that the said planar diffuser does not exist. Light emitting diode lamp.

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