JP2009009926A - Light emitting diode lighting system - Google Patents

Light emitting diode lighting system Download PDF

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Publication number
JP2009009926A
JP2009009926A JP2008020829A JP2008020829A JP2009009926A JP 2009009926 A JP2009009926 A JP 2009009926A JP 2008020829 A JP2008020829 A JP 2008020829A JP 2008020829 A JP2008020829 A JP 2008020829A JP 2009009926 A JP2009009926 A JP 2009009926A
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Japan
Prior art keywords
light
emitting diode
annular
surface
light emitting
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JP2008020829A
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Japanese (ja)
Inventor
Kiyoshi Nishimura
Kozo Ogawa
光三 小川
潔 西村
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Toshiba Lighting & Technology Corp
東芝ライテック株式会社
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Priority to JP2007143314 priority
Application filed by Toshiba Lighting & Technology Corp, 東芝ライテック株式会社 filed Critical Toshiba Lighting & Technology Corp
Priority to JP2008020829A priority patent/JP2009009926A/en
Publication of JP2009009926A publication Critical patent/JP2009009926A/en
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Abstract

A light-emitting diode illuminating device capable of improving luminous efficiency and reducing cost is provided.
An annular lens body 2c, an annular groove 2d formed in a bottom surface 2a of the lens body, and light incident on the inner surface formed on at least an outer peripheral surface of the lens body is projected. A plurality of annular lenses 2 having a total reflection surface 2c2 for total reflection to the surface side, and a plurality of optical lenses disposed in opposition to the annular groove of the annular lens and arranged at a predetermined interval in the circumferential direction of the annular groove. The light emitting diode devices 3, 3, 3.
[Selection] Figure 1

Description

  The present invention relates to a light emitting diode illumination device using a light emitting diode device as a light source.

  In recent years, light emitting diode illumination devices for general illumination using the light emitting diode device as a light source have been commercialized due to the improvement of the light emission efficiency of the light emitting diode device.

  For example, many round spotlights and downlights using a plurality of power light emitting diodes as light sources have been commercialized.

  As an example of these lighting devices, a lens is provided for each light-emitting diode device for light distribution control suitable for the purpose, and each light-emitting diode device and each lens are fixed to the fixture body. (Hereinafter referred to as Prior Art 1).

Also, an LED illumination device is known in which a plurality of light emitting diode devices are arranged in a ring shape, and the light emitted from these light emitting diode devices is collected on a sample at the center of the ring by an annular lens (see, for example, Patent Document 1). Hereinafter, it is referred to as Conventional Technology 2).
JP 2007-10380 A

  However, in the above prior art 1, in recent years, the luminous efficiency of a single light emitting diode device has been gradually improved. Therefore, specification changes and new lighting devices have been proposed one after another in a relatively short period of time.

  That is, when the luminous flux of a single light emitting diode device increases, the number of light emitting diode devices required for one lighting fixture decreases, and the number of lenses also decreases.

  For this reason, it is necessary to change the lighting equipment. That is, since the lens is fixed to the lighting fixture in advance, the lighting fixture is specially designed according to the number of light-emitting diode devices mounted. For this reason, when the number of mounted light emitting diode devices is changed, the lighting fixture itself must be reviewed.

  Therefore, in order to use a high-efficiency light-emitting diode device, it is necessary to review the illuminator in a short period, and there is a problem that the development cost increases.

  Further, in the above-described prior art 2, light emitted from a plurality of light emitting diodes incident on the annular lens from the lateral direction with respect to the optical axis cannot be condensed by the annular lens, and the luminous efficiency is obtained as lateral leakage light. There is a problem of lowering.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light-emitting diode illuminating device capable of both improving luminous efficiency and reducing cost.

  The light-emitting diode illuminating device according to claim 1 is an annular lens body, an annular groove formed on one end surface in the axial direction of the lens body, and formed on an inner surface of at least the outer peripheral side of the lens body. An annular lens having a total reflection surface that totally reflects incident light toward the light projecting surface; optically disposed in an annular groove of the annular lens and spaced at a required interval in the circumferential direction of the annular groove And a plurality of light emitting diode devices arranged in the same manner.

  The light-emitting diode illuminating device according to claim 2 is characterized in that the annular lens is configured such that the inner surface on the inner peripheral side of the lens body is capable of light transmission and irregular reflection.

  The light-emitting diode illuminating device according to claim 3 is characterized in that the annular lens includes a light transmitting body that closes the annular center hole on the light projecting surface side on the other axial end side of the lens body. . Note that the translucent material is not particularly limited as long as it transmits light, and if it has diffusibility, the entire lens can be illuminated.

  A light-emitting diode illuminating device according to a fourth aspect of the present invention is an annular lens body, an annular groove formed on one end surface in the axial direction of the lens body, and formed on at least an inner peripheral surface of the lens body on the inner surface. An annular lens having a total reflection surface that totally reflects incident light toward the light projecting surface; optically disposed in an annular groove of the annular lens and spaced at a required interval in the circumferential direction of the annular groove A plurality of light emitting diode bare chips arranged in a ring on the substrate, and a light emitting diode device having a translucent resin portion covering the outer surface of the light emitting diode bare chips and having a translucent resin disposed on the substrate. It is characterized by.

  The light-emitting diode illuminating device according to claim 5 is characterized in that the arrangement pitch P of the light-emitting diode bare chips and the width direction dimension W of the resin portion have a relationship of P <2 · W.

  The light-emitting diode illuminating device according to claim 6 is characterized in that a gap is formed between the annular lens and the substrate.

  The light-emitting diode illuminating device according to claim 7 has an annular lens body, an annular light incident surface formed on one end surface of the lens body, and an annular light projecting surface formed on the other end surface of the lens body. An annular lens; an annular light exit surface optically disposed opposite the light incident surface of the annular lens, an annular light entrance surface, and light incident on the light entrance surface is guided to the light exit surface An annular light guide having an annular light guide; and a light emitting diode device having a plurality of light emitting diodes arranged annularly on the substrate so as to optically oppose a light incident surface of the light guide. It is characterized by having.

  The light-emitting diode illuminating device according to claim 8 is characterized in that the light guide is formed such that its ring diameter gradually decreases from one end on the light incident surface side toward the other end on the light emission side.

  In the light-emitting diode illuminating device according to claim 9, the light guide is formed such that the thickness of the light guide path in the radial direction gradually decreases from one end on the light incident surface side to the other end on the light output surface side. It is characterized by being.

  The light-emitting diode illuminating device according to claim 10 is characterized in that the light guide has one end on the light exit surface side integrally connected to the end on the light incident surface side of the annular lens.

  The light-emitting diode illuminating device according to claim 11 is characterized in that the light-emitting diode device has a plurality of types of light-emitting diodes having different emission colors.

  According to the light-emitting diode illuminating device according to claim 1, since the plurality of light-emitting diode devices are optically opposed to each other in the annular groove of the annular lens, The entire annular lens can emit light.

  Moreover, since at least the inner surface on the outer peripheral side of the annular lens is formed as a total reflection surface, the light incident on the outer peripheral side from the light emitting diode device is totally reflected toward the light projecting surface, and this outer peripheral side Lateral leakage light that leaks outward from the side surface can be reduced.

  For this reason, since almost the entire projection surface of the annular lens can emit light, it is possible to reduce glare and improve luminous efficiency.

  Since a plurality of light emitting diode devices are arranged on one annular lens, it is possible to easily cope with a change in the number of light emitting diode devices by one annular lens.

  According to the light-emitting diode illuminating device according to claim 2, since light transmission and irregular reflection are generated and diffused on the inner surface on the inner peripheral side of the annular lens, the inner peripheral side and the inner annular central portion thereof are diffused. The brightness in can be improved.

  According to the light-emitting diode illuminating device of the third aspect, the light transmitted through and diffusely reflected on the inner peripheral side surface of the annular lens body is incident on the transparent body at the annular central hole on the light projecting surface side, and emits the light. Let For this reason, since light can be emitted also in the annular center hole of the annular lens, glare can be further reduced. If considered as a lens / cover, there is no need for a cover and assembly is easy.

  According to the light-emitting diode illuminating device of the fourth aspect, since a plurality of small light-emitting diode bare chips, which are light-emitting elements, are directly mounted on the substrate in an annular shape, the number of mounted light-emitting diode bare chips can be increased. For this reason, the luminous flux can be increased.

  In addition, since a plurality of light emitting diode bare chips are annularly arranged on the substrate, the generated heat of the light emitting diode bare chips is concentrated on one point of the substrate even if the number of light emitting diode bare chips mounted is increased or the input power is increased. The heat dissipation can be improved.

  For this reason, heat concentrates on one point on the substrate and the temperature of the light emitting diode bare chip rises to lower the light emission efficiency, or heat is transferred to the phosphor to reduce the quantum efficiency of the phosphor and reduce the output light. The problem that the emission color changes can be prevented or reduced.

  Furthermore, the plurality of light emitting diode bare chips are not planar. Since they are arranged in a ring shape, that is, in a linear shape, light distribution control almost the same as that of a point light source is possible in the cross section of these light emitting diode bare chips, and the ease of designing an annular lens can be improved accordingly. . Further, when the light emitting diode bare chip is disposed concentrically with respect to the annular lens, apparently smooth light distribution in which light continues in the circumferential direction can be obtained.

  According to the light-emitting diode illuminating device of the fifth aspect, the distance between the light-emitting diode bare chips is shorter than twice the width of the translucent resin portion. For this reason, since the luminous intensity emitted from the light emitting diode bare chip in the arrangement pitch direction is higher than the luminous intensity output in the width direction of the translucent resin portion, a small size that can be seen through the annular lens. It is possible to reduce or prevent a phenomenon in which the projection of the light emitting diode bare chip appears to be grainy.

  According to the light emitting diode illuminating device of the sixth aspect, since there is a gap between the annular lens and the substrate, heat generated by the light emitting diode bare chip can be radiated through this gap. For this reason, heat dissipation can be further improved.

  According to the light emitting diode illuminating device according to claim 7, the light emitted from the light emitting diode device and incident on the light incident surface of the light guide is guided to the light emitting surface while being repeatedly reflected by the side surface of the light guide. Is done. Therefore, even if a plurality of lights having different light colors are included during light emission of the light emitting diode device, the light emission is guided to the light emitting surface side by repetition of reflection on the side surface of the light guide body. Since they are mixed, color unevenness can be reduced.

  According to the light-emitting diode illuminating device of the eighth aspect, since the light guide body is gradually reduced in diameter from one end on the light incident surface side toward the other end on the light exit side, light is emitted from one end on the light incident surface side of the light guide. Without reducing the length of the light guide path to the other end of the light emitting surface, the axial length (height) from the light incident surface side one end of the light guide itself to the light emitting side other end can be reduced. .

  Moreover, since the ring diameter of the light exit surface side one end of the light guide is reduced, the ring diameter of the light incident side end of the annular lens facing the light exit surface of the light guide is adjusted according to the reduced diameter. The diameter can be reduced. For this reason, it is possible to reduce the size of the annular lens.

  According to the light-emitting diode illuminating device of the ninth aspect, since the thickness in the reduced diameter direction on the light emitting surface side of the light guide is thin, the luminance on the light emitting surface side can be increased accordingly. For this reason, lens efficiency can be improved.

  According to the light-emitting diode illuminating device of the tenth aspect, the light exit surface side one end of the light guide is integrally connected to the light incident surface side end portion of the annular lens. Thus, it is possible to prevent or reduce reflection loss due to reflection occurring between both surfaces. For this reason, lens efficiency can be improved.

  According to the light-emitting diode illuminating device according to claim 11, even if a plurality of types of light-emitting diodes having different emission colors are provided, the plurality of emission colors are mainly mixed in the light guide as described above. Color unevenness can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in several attached drawing.

  1 is a plan view of a main part of a light-emitting diode illuminating device 1 according to a first embodiment of the present invention, FIG. 2 is a view taken along the line II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.

  As shown in FIGS. 1 to 3, the light-emitting diode illuminating device 1 includes an annular lens 2 having a circular planar shape and a plurality of light-emitting diode devices 3, 3, 3.

  As shown in FIGS. 1 and 2, the annular lens 2 is an annular lens formed in a flat bowl shape that gradually increases in diameter from the bottom surface 2 a that is one end surface in the axial direction toward the light projecting surface 2 b that is the other end surface. A lens body 2c is provided. At the center Oa of the lens body 2c, a required large center hole 2o penetrating in the axial direction is formed.

  As shown in FIG. 3, the lens body 2c has an inner surface 2c1 on the annular inner periphery side and an inner surface 2c2 on the annular outer periphery side formed on the total reflection surface by an outwardly convex circular arc surface.

  The lens body 2c has a light projecting surface 2b formed in a substantially flat surface, while a bottom surface 2a is formed with a required large annular groove 2d concentrically at the center thereof. The bottom surface 2d1 of the annular groove 2d is also formed as a downwardly convex circular arc surface in FIG. 3, and its inner surface is formed as a total reflection surface.

  On the bottom surface 2a side of the lens body 2c, a plurality of planar circular light emitting diode devices 3, 3, 3,... Are concentrically arranged annularly below the annular groove 2d in FIG. Thereby, each light emitting diode device 3 is optically disposed opposite to the annular groove 2d.

  That is, as shown in FIGS. 1 and 3, each of the light emitting diode devices 3, 3, 3... Is formed to have a diameter slightly smaller than the width of the annular groove 2d, and required in the circumferential direction of the annular groove 2d. Arranged at equal pitches.

  Each light emitting diode device 3 is, for example, a bullet-shaped light emitting diode device, and a cylindrical envelope 3a is filled with a synthetic resin in which, for example, a blue light emitting diode chip (not shown) and a yellow light emitting phosphor are mixed. Thus, an outwardly convex condenser lens 3b is formed.

  That is, each light emitting diode device 3 emits blue light emitted from the light emitting diode chip to yellow light from the yellow light emitting phosphor and mixes the blue light emission and yellow light emitting phosphor to emit white light from the condenser lens 3b to the outside. It is configured to let you.

  Each light emitting diode chip is erected on a circular substrate 4. The substrate 4 forms a circuit (not shown). The light-emitting diode chips are electrically connected to each other by this circuit, and are electrically connected to a lighting device (not shown).

  The light-emitting diode illuminating device 1 fixes the annular lens 2, the substrate 4, and a lighting device (not shown) to a fixture body (not shown).

  Therefore, when a required lamp voltage is applied to a lighting device (not shown), the lamp voltage is applied to each of the light emitting diode devices 3, 3, 3.

  For this reason, white light is output from the condenser lens 3 b of each light emitting diode device 3. These white lights are radiated in all directions in the annular groove 2 d of the annular lens 2.

  As shown in FIG. 4, the white light a emitted from the light emitting diode devices 3 to the bottom surface 2d1 of the annular groove 2d, the inner peripheral side surface 2d2, and the outer peripheral side surface 2d3 is separated from the bottom surface 2d1 and both sides. The light enters the lens body 2c from the surfaces 2d2 and 2d3, is totally reflected by the total reflection surfaces 2c1 and 2c2 on both outer sides, and is emitted from the light projecting surface 2b to the outside.

  On the other hand, a part b of light linearly radiated from each light emitting diode device 3 in the circumferential direction in the annular groove 2d is radiated to the side surface 2d3 on the outer peripheral side of the annular groove 2d, and is incident on the lens body 2c from here. The light is totally reflected by the total reflection surface 2d3 on the outer peripheral side in the lens body 2c and is projected from the light projection surface 2b to the outside.

  Further, of the light b radiated in the circumferential direction of the annular groove 2d, the light incident from the groove bottom surface 2d1 into the lens body 2c before the side surface 2d3 on the outer circumferential side of the annular groove 2d is reflected on the lens body 2c. After being totally reflected by the total reflection surfaces 2c1 and 2c2 on both the inner and outer side surfaces, the light is emitted to the outside from the light projecting surface 2b.

  In the total reflection surface 2c1 on the inner peripheral side of the annular lens 2, most of the light incident on the total reflection surface 2c1 is totally reflected toward the light projecting surface 2b, but some of the light is reflected on the total reflection surface 2c1. The light is transmitted or diffusely reflected, emitted to the center hole 2o side, and projected from the light projecting surface 2b of the center hole 2o to the outside.

  For this reason, almost the entire light projecting surface 2b of the annular lens 2 emits light, and light is also projected from the center hole 2o, so that glare can be reduced.

  FIG. 5 shows an orientation characteristic A when the light-emitting diode illuminating device 1 configured in this way is attached to the ceiling surface 5 and used as a downlight for illuminating the lower side thereof. This orientation characteristic A is characterized by a divergent orientation in the lower part of FIG.

  Since the light emitting diode illuminating device 1 has at least the inner side surface 2c2 on the outer peripheral side of the annular lens 2 formed on the total reflection surface, the light incident on the outer peripheral side inner surface 2c2 from the light emitting diode device 3 is projected. It is possible to reduce side leakage light that is totally reflected toward the surface 2b and leaks outward from the outer peripheral side inner surface 2c2.

  For this reason, since almost the entire projection surface 2b of the annular lens 2 can be made to emit light, it is possible to reduce glare and to improve the light emission efficiency.

  Since a plurality of light emitting diode devices 3, 3, 3... Are arranged on one annular lens 2, it is possible to easily cope with a change in the number of light emitting diode devices 3 by one annular lens 2. it can.

  FIG. 6 is a longitudinal sectional view of a main part of a light-emitting diode illuminating device 1A according to the second embodiment of the present invention. This light-emitting diode illuminating device 1A is the same as the light-emitting diode illuminating device 1 shown in FIG. 1, except that the total reflection surface of the inner peripheral side surface 2c1 of the annular lens 2 is formed as a simple reflective surface 2c1A capable of light transmission and irregular reflection. It is characterized in that a translucent flat disk 2oA is disposed on the light projecting surface 2b side of the center hole 2o. The other configuration is almost the same as that of the light-emitting diode illuminating device 1 shown in FIG.

  According to the light-emitting diode illuminating device 1A, the inner surface 2c1 on the inner peripheral side of the annular lens 2 is formed on the simple reflecting surface 2c1A, so that it is transmitted through the reflecting surface 2c1A or diffusely reflected in the lens body 2b. The amount of light emitted from the center to the center hole 2o side can be increased.

  For this reason, the brightness of light emission of the disk 2oA on the light projecting surface 2b side from the center hole 2o can be improved as compared with the light emitting diode illuminating device 1. As a result, the glare can be further reduced.

  In each of the above embodiments, the case where the bullet-shaped light emitting diode device 3 is used as the light emitting diode device 3 has been described. However, the present invention is not limited to this, and other light emitting diode devices may be used. For example, the light emitting diode device 3A according to the third embodiment shown in FIG. 7 may be used.

  In this light emitting diode device 3A, a plurality of blue light emitting diode bare chips 3A1, 3A1,..., For example, are directly disposed on a disc-like substrate 4 in a circular and concentric manner with a required pitch in the circumferential direction.

  Further, on the substrate 4, on the light emitting diode bare chips 3A1, 3A1,... Arranged in an annular shape, for example, a synthetic resin mixed with a yellow light emitting phosphor is annularly and concentrically laminated to project outward. Formed on the condenser lens 3A2.

  According to the light emitting diode device 3A, since the plurality of light emitting diode chips 3A1, 3A1,... And the condenser lens 3A2 are integrally formed, the light emitting diodes are formed rather than the case where they are formed individually as in the case of the bullet light emitting diode device 3. High-density mounting of the chips 3A1, 3A1,... Can be achieved, and accordingly, the brightness as the light-emitting diode illuminating device can be improved.

  8 is a plan view of a light-emitting diode illuminating device 1B according to a fourth embodiment of the present invention, FIG. 9 is a plan view of a light-emitting diode device 3B of the light-emitting diode illuminating device 1B, and FIG. 10 is an XX line in FIG. It is sectional drawing.

  As shown in FIG. 8, the light emitting diode illuminating device 1B is provided with a light emitting diode device 3B having a plurality of light emitting diode bare chips 5, 5,... Instead of the light emitting diode device 3 of the light emitting diode illuminating device 1 shown in FIG. There are main features. Other configurations are almost the same as those of the light-emitting diode illuminating device 1 shown in FIG.

  As shown in FIGS. 8 and 9, the light emitting diode device 3 </ b> B has a plurality of light emitting diode bare chips 5, 5, 5 arranged in a circumferential direction on a circular substrate 4 concentrically with a circular annular groove of the annular lens 2. Are arranged concentrically with a required equal pitch P.

  As shown in FIGS. 9 and 10, for example, the planar circular substrate 4 is formed of aluminum (Al), nickel (Ni), or the like having heat dissipation and rigidity, and on one surface (the upper surface in FIGS. 9 and 10). Then, an electrical insulation layer 4a such as a white glass epoxy resin having electrical insulation is formed.

  Furthermore, a pair of circuit patterns (on the cathode (−) side and on the anode (+) side) are formed on the electrical insulating layer 4a by an alloy of copper (Cu) and nickel (Ni) or gold (Au) plating of this alloy. Wiring patterns) 6a and 6b are formed. In these circuit patterns 6a and 6b, the anode and cathode electrodes of, for example, a blue light emitting diode bare chip 5 fixed on the electrical insulating layer 4a are bonded by bonding wires 7. Electrically connected.

  As shown in FIG. 9, the pair of circuit patterns 6a and 6b is divided into, for example, five pieces in the circumferential direction of the substrate 4 to form a planar shape in a sector shape, and each pair of circuit patterns 6a and 6b has a shape as shown in FIG. Are electrically connected in series to form one set, and the series circuit of these five sets of light emitting diode bare chips 5, 5, 5,. Connected in parallel.

  Further, a thermoelectric insulating member Z that insulates both heat and electricity is interposed in each gap between each pair of fan-shaped circuit patterns 6a, 6b, 6a, 6b adjacent in the circumferential direction. However, a simple gap may be used without the thermoelectric insulating member Z interposed.

  As shown in FIG. 9, the light-emitting diode device 3B is formed by concentrating translucent silicon resin with a predetermined width on the annular array of light-emitting diode bare chips 5, 5,. The light-transmitting resin portion 8 is formed by laminating the light-emitting diode bare chips 5, 5, 5... On the substrate 4 by the light-transmitting resin portion 8. In this translucent resin portion 8, a yellow light-emitting phosphor such as a YAG phosphor that emits yellow light by blue light emission of the light-emitting diode bare chip 5 is dispersed in the silicon resin.

  On both sides in the width direction of the translucent resin portion 8, a pair of left and right side walls 9a and 9b as reflecting portions are concentrically formed on the substrate 4 with white resin or the like so as to border the outer surfaces of both sides. .

  The pair of side walls 9a and 9b form an inclined surface S that gradually expands toward the annular lens 2 on the opposing surface (inner side surface), and the inclined surface S is incident on the inclined surface S. It is formed on a reflection surface that reflects light toward the annular groove 2 d side of the annular lens 2.

  The width direction dimension W of the light projecting surface (upper end surface in FIG. 10) inside the pair of side walls 9 a and 9 b is the opening width of the annular groove 2 d of the annular lens 2. Is smaller than the width dimension wa (W <wa), and the arrangement pitch p between the light-emitting diode bare chips 5, 5,.

  As shown in FIG. 12, a gap g is formed between the upper surface of the substrate 4 in the drawing and the bottom surface 2a of the annular lens 2.

  Since the light emitting diode illumination device 1B is configured as described above, when a required DC voltage is applied to each light emitting diode bare chip 5 from a lighting device (not shown) via each circuit pattern 6a, 6b, each light emitting diode. The bare chip 5 emits blue light. Such blue light emission excites the yellow phosphor in the translucent resin portion 8 to emit yellow light. Further, the yellow light emission is combined with the blue light emission in the translucent resin portion 8 or the annular lens 2 and output as white light.

  As in the first embodiment shown in FIG. 1 and the like, the white light and the like are output from the light projecting surface 2b by totally reflecting the light incident on the inner surface on the outer peripheral side in the annular lens 2. The

  In addition, an example of the specific example of this light emitting diode illuminating device 1B is as follows. That is, on the white electrical insulating layer 4a of the aluminum substrate 4 having a diameter of 70 mm, 0.3 mm square light emitting diode bare chips 5, 5,... Are arranged in two rows of concentric circles having a diameter of 50 mm and 30 mm at an equal pitch of 1 mm. .., And a total of 251 light-emitting diode bare chips 5, 5,... Further, when 10% by mass of YAG phosphor was added to the transparent silicon resin of the translucent resin portion 8 and the width W was 2 mm, the luminous efficiency was 80 lm / W, and the total luminous flux was 1200 lm.

  Further, according to the light emitting diode illumination device 1B, since a plurality of small light emitting diode bare chips 5 as light emitting elements are directly mounted on the substrate 4 in an annular shape, the number of light emitting diode bare chips 5, 5,. Can be made. For this reason, the luminous flux can be increased.

  Further, since the plurality of light emitting diode bare chips 5, 5,... Are annularly arranged on the substrate 4, even if the number of mounted light emitting diode bare chips 5 is increased or the input power is increased, the light emitting diode bare chips 5, The generated heat of 5,... Can be dispersed without being concentrated on one point of the substrate 4, and the heat dissipation can be improved.

  For this reason, heat concentrates on one point on the substrate 4 to raise the temperature of the light emitting diode bare chips 5, 5, and the luminous efficiency is lowered, or heat is applied to the yellow phosphor of the translucent resin portion 8. It is possible to prevent or reduce the problem that the yellow phosphor is transmitted and the quantum efficiency of the yellow phosphor is lowered and the emission color of the output light is changed.

  Further, since the plurality of light emitting diode bare chips 5, 5,... Are arranged not in a planar shape but in a ring shape, that is, in a linear shape, the light distribution in the cross section of these light emitting diode bare chips 5, 5,. Control is possible, and the design ease of the annular lens 2 can be improved accordingly. When the light emitting diode bare chips 5, 5,... Are arranged concentrically with respect to the annular lens 2, apparently a smooth light distribution with continuous light in the circumferential direction can be obtained.

  Further, the arrangement pitch P of the light emitting diode bare chips 5, 5,... Has a relationship of P <2 · W with respect to twice the width direction dimension W of the translucent resin portion 8 (2 · W). Since the luminous intensity radiated from the light emitting diode bare chip 5 in the arrangement pitch direction is higher than the luminous intensity output in the width direction of the translucent resin portion 8, small light emission that can be seen through the annular lens 2. The phenomenon that the projection of the diode bare chip 5 appears to be grainy can be reduced or prevented.

  Further, since there is a gap g between the annular lens 2 and the substrate 4, heat generated by the light emitting diode bare chips 5, 5,... Can be radiated through the gap g. For this reason, heat dissipation can be further improved.

  FIG. 13 is a longitudinal sectional view of a light-emitting diode illuminating device 1C according to a fifth embodiment of the present invention. This light-emitting diode illuminating device 1C has an annular light guide 10 disposed concentrically with a required lower gap ga on the light-emitting diode device 3A shown in FIG. On the annular light guide 10, there is a feature that an annular lens 11 is concentrically arranged with a required upper gap gb and optically opposed.

  As shown in FIG. 7, this light-emitting diode device 3A has, for example, a plurality of blue light-emitting diode bare chips 3A1, 3A1,. Directly disposed on the.

  Further, on the substrate 4, on the light emitting diode bare chips 3A1, 3A1,... Arranged in an annular shape, for example, a synthetic resin mixed with a yellow light emitting phosphor is annularly and concentrically stacked and formed outward (FIG. 13 is formed on a condensing lens 3A2 convex upward.

  The light guide 10 has a central hole 10b having a predetermined diameter concentrically and axially formed in a cylindrical body 10a having a predetermined length formed by a transparent body such as a transparent transparent acrylic resin or polycarbonate. By drilling so as to penetrate in the direction, an annular light guide 10c is formed.

  The light guide path 10c is formed by forming the annular lower end surface 10d and the upper end surface 10e in FIG. 13 concentrically facing the condensing lens 3A2 via the lower gap ga on a flat surface, respectively. Are formed on the light incident surface, and the upper end surface 10e is formed on the light emitting surface.

  The annular light incident surface 10d has its width direction center Oa along the annular diameter direction substantially coincided with the width direction center Ob along the annular diameter direction of the annular condenser lens 3A2.

  The annular lens 11 has an annular lens body 11a whose longitudinal section is substantially semicircular, and a lower end surface 11b in FIG. 13 of the lens body 11a is formed on a flat surface to form a light incident surface. 13, an upwardly convex circular arc surface 11 c is formed on the light projecting surface.

  In the annular lens 11, the width direction center Oc along the annular direction of the light incident surface 11 be at the lower end thereof substantially coincides with the width direction center Od along the ring direction of the light emitting surface 10 e at the upper end of the light guide 10. ing.

  Since the light-emitting diode illuminating device 1C is configured in this way, the blue light from the light-emitting diode bare chips 3A1, 3A1,... Excites the yellow phosphor in the condenser lens 3A2 to emit yellow light. And blue light are mixed and converted to white light.

  For this reason, mainly white light, some yellow light, and blue light are emitted from the condenser lens 3A2. Further, these lights are refracted by the lower gap ga and then enter the light incident surface 10 d of the light guide 10.

  White light, blue light, and yellow light incident on the annular light guide 10c from the light incident surface 10d are repeatedly totally reflected on the inner peripheral side inner surface in and the outer peripheral side inner surface out of the annular light guide 10c. The light is guided to the light exit surface 10e.

  The white light, the blue light, and the yellow light incident on the annular light guide 10c are thus repeatedly reflected on the inner surfaces of the light guide 10c on both sides of the outer periphery, so that the light emitting surface 10e has blue light and yellow light. Light color mixing is promoted. For this reason, both color unevenness and brightness unevenness can be reduced.

  Accordingly, white light with reduced color unevenness and brightness unevenness is incident on the light incident surface 11b of the annular lens 11 from the light emitting surface 10e of the light guide 10, and therefore, from the light projecting surface 11c of the annular lens 11 White light with reduced color unevenness and brightness unevenness is projected to the outside.

  FIG. 14 is a longitudinal sectional view of a light-emitting diode illuminating device 1D according to a sixth embodiment of the present invention. This light-emitting diode illuminating device 1D is mainly characterized in that, in the light-emitting diode illuminating device 1C shown in FIG. 13, the straight cylindrical light guide 10 is replaced with a light guide 10D having a substantially frustoconical outer shape. Have

  That is, the frustoconical light guide 10D is formed so that the diameter of the main body 10Da is gradually reduced from the lower light incident surface 10Dd side toward the upper light emitting surface 10De side in FIG. It is formed in a truncated cone shape. However, the width dimension along the radial direction of the annular light guide path 10Dc connecting the annular light incident surface 10Dd and the annular light exit surface 10De is formed to be substantially equal on both the surfaces 10Dd and 10De.

  This light emitting diode illumination device 10D also promotes color mixing when the blue light and yellow light from the light emitting diode device 3A are guided to the light exit surface 10De by the light guide 10Dd. Unevenness can be reduced together.

  Further, the light emitting surface 10De side end portion of the truncated cone-shaped light guide 10D is reduced in diameter, and the light guide path 10Dc is inclined to the center side of the light guide 10D by a required angle. It is possible to reduce the size of the light exit surface 10De side end portion without reducing the length of the light guide path 10Dc from the entrance surface 10Dd to the light exit surface 10De.

  For this reason, it is possible to reduce the size of the annular lens 10D that is optically opposed to the light exit surface 10De of the light guide 10D by reducing the ring diameter. As a result, the light emitting diode illumination device 10D as a whole can be reduced in size and weight.

  FIG. 15 is a longitudinal sectional view of a light-emitting diode illuminating device 10E according to a seventh embodiment of the present invention. This light-emitting diode illuminating device 10E is characterized in that, in the light-emitting diode illuminating device 10D shown in FIG. 14, the circular light guide 10Dc of the truncated cone-shaped light guide 10D is replaced with a tapered annular light guide 10Ec.

  That is, the tapered annular light guide 10Ec is formed such that the thickness of the truncated cone-shaped light guide body 10Ea gradually decreases from the light incident surface 10Ed toward the light exit surface 10Ee. It has a tapered shape.

  For this reason, since the plane area of the light exit surface 10Ee of the light guide 10E is reduced, the luminance on the light exit surface 10Ea can be increased accordingly. As a result, it is possible to improve the concentration of incident light incident on the light incident surface 11Eb of the annular lens 11E.

  Further, the light guide 10E can be reduced in weight because the light emitting surface 10Ed side end of the light guide 10E is formed thin.

  FIG. 16 is a longitudinal sectional view of a light-emitting diode illuminating device 1F according to an eighth embodiment of the present invention. This light-emitting diode illuminating device 10F is characterized in that in the light-emitting diode illuminating device 1C shown in FIG. 13, the straight cylindrical light guide 10c is replaced with a tapered annular light guide 10Fc.

  That is, the tapered annular light guide 10Fc forms the light guide body 10Fa in the straight body as in the light guide body 10a shown in FIG. 13, while the center hole 10Fb is directed from the light emitting surface 10Fe to the light incident surface 10Fd. Thus, the light guide path 10Fc is formed so as to gradually become thinner from the light incident surface 10Fd toward the light emitting surface 10Fe.

  Therefore, the luminance of the light emitting surface 10Fe of the tapered annular light guide 10F can be increased by this light-emitting diode illuminating device 10F as well as the light-emitting diode illuminating device 1E shown in FIG. Can do.

  The light emitting diode device 3A may be replaced with the light emitting diode devices 3B and 3C shown in FIGS. 17 and 18, respectively. In the light emitting diode device 3B shown in FIG. 17, an annular inner condenser lens 12 and an annular outer condenser lens 13 having a predetermined diameter and a larger diameter than the inner condenser lens 12 are concentrically formed on the substrate 4. There is a feature in that one of the inner and outer condenser lenses 12 and 13 is configured to emit, for example, white light and the other to emit light bulb color.

  That is, first, a plurality of light emitting diode bare chips 3B1, 3B1,... That emit blue light, for example, are required in the circumferential direction on the substrate 4 at the positions where the inner and outer condenser lenses 12, 13 are to be disposed. The inner and outer two rows of light emitting diode bare chip rows 12a and 13a are formed concentrically with each other arranged in a ring at a pitch.

  Next, on these annular arrays of the outer and outer light emitting diode bare chip rows 12a and 13a, the synthetic resin containing the phosphor emitting the white light by the blue light of the light emitting diode bare chip 3B1 and the phosphor emitting the light bulb color, respectively. Are arranged in an annular shape with a required width to form inner and outer condenser lenses 12 and 13, respectively.

  The inner and outer condenser lenses 12 and 13 are optically opposed to the light incident surfaces 10d, 10Dd, 10Ed, and 10Fd of the light guides 10, 10D, 10E, and 10F.

  Therefore, in this case, the white light from the inner and outer condenser lenses 12 and 13 and the light bulb color light can be mixed by the light guides 10, 10D, 10E, and 10F to reduce color unevenness.

Further, according to the light emitting diode device 3B, since there are two light emitting diode bare chip rows 12a and 13a, the light emission amount of the light emitting diode device 3B as a whole can be increased as compared with the case of one row.

  18 is similar to the light emitting diode device 3B shown in FIG. 17 in that a plurality of light emitting diode bare chips 3C1, 3C1,... The annular inner light emitting diode bare chip row 14 and the outer light emitting diode bare chip row 15 are formed respectively.

  The positions of the light emitting diode bare chips 31C1 in the inner light emitting diode bare chip row 14 are shifted from each other in the circumferential direction, and among these, the light emitting diode bare chips adjacent to each other in one circumferential direction of the outer light emitting diode bare chips 14,15. The other light emitting diode bare chip 31C1 is disposed in the gap between 31C1, 31C1,.

  Of these two rows, on the outer light emitting diode bare chip rows 14 and 15, for example, a synthetic resin mixed with a yellow light emitting phosphor is laminated in an annular and concentric manner so as to cover them integrally. A convex annular band-shaped condensing lens 3C2 is formed (on the front side of the drawing in FIG. 18).

  FIG. 19 is a graph showing light distribution characteristics in the vertical direction (Z axis) of the light emitting diode device 3C. That is, as shown in FIG. 18, with respect to a horizontal plane including the X-axis and Y-axis of the center O of the substrate 4, an angle obtained by tilting the Z-axis standing vertically from the center O from 0 ° (vertical) to 60 ° Is shown on the horizontal axis, and the relative luminous intensity at these angles is shown on the vertical axis. The relative luminous intensity is the maximum luminous intensity value when both the inner and outer light emitting diode bare chips 14 and 15 are turned on (indicated by solid lines (both in FIG. 19)) and the Z axis is 0 ° (vertical). Is shown.

  In FIG. 19, the dotted line curve shows the relative luminous intensity when the light emitting diode bare chips 31C, 31C,... The light intensity when 31C,... Is turned on is shown. Further, the solid curve shows the relative luminous intensity when both the light emitting diode bare chips 31C, 31C,...

  As shown in FIG. 19, the Z-axis inclination angle (1/2 beam angle) indicating the luminous intensity 0.5 which is half the maximum value of the relative luminous intensity is 20 when only the inner light emitting diode bare chip array 14 is turned on. This is larger than 14 ° when only the outer light emitting diode bare chip array 15 is lit and 16 ° when both of these 14 and 15 are lit, indicating that the light distribution is wide.

  In the light emitting diode device 3C, when the substrate 4 has a diameter of, for example, 40 m, the annular diameter of the inner light emitting diode bare chip array 14 is 19 mm, and the outer light emitting diode bare chip array 15 has an annular diameter of 21 mm, It was about 1000 lm.

  On the other hand, when the diameter of the substrate 4 is also 40 m, but the light emitting diode bare chip row is one row and the ring diameter is 20 mm, the light amount is about 500 lm, the light amount of the two rows of light emitting diode devices 3C. Has approximately twice the amount of light.

  When the diameter of the substrate 4 was 80 mm and the ring diameters of the inner and outer light emitting diode bare chip rows 14 and 15 were 59 mm and 61 mm, respectively, the amount of light was about 3000 lm.

  On the other hand, when the light emitting diode bare chip row has a ring diameter of 60 mm and one row, the amount of light is about 1500 lm, which is almost half of the light emitting diode device 3C.

  Then, a total of 4 light emitting diode bare chip rows 14 and 15 having two ring diameters of 19 mm and 21 m and two rows of light emitting diode bare chip rows 14 and 15 having a ring diameter of 59 mm and 60 m are provided on the substrate 4 having a diameter of 80 mm. The amount of light when the row was provided was 4000 lm, which is the sum of 1000 lm and 3000 lm of each of these light amounts. That is, a light amount of 4000 lm can be realized with an instrument size of about E-CORE 60W.

  In each of the above-described embodiments, the case where a plurality of light-emitting diode bare chips 3A1, 3B1, 3C1 and light-emitting diodes 5 are concentrically arranged on a disk-shaped substrate 4 is described. The present invention is not limited to this. For example, the light emitting diode bare chips 3A1, 3B1, 3C1 and the light emitting diodes 5 may be arranged in a plurality of concentric circles in two or more rows, and the arrangement is limited to a circle. However, it may be rectangular or polygonal and may be annular.

  Furthermore, although the translucent resin part 8 and the condensing lenses 3b, 3A2, and 3C2 have been described with respect to the case where the yellow phosphor is dispersed, the present invention is not limited to this yellow phosphor, and further, the phosphor is dispersed. Alternatively, it may be formed of only a transparent resin, or a light diffusing material may be dispersed in the resin. Further, the light emission colors of the light emitting diode bare chips 3A1, 3B1, 3C1, and the light emitting diode 5 are not limited to blue light, and other light emission colors such as R (red), G (green), and B (blue) may be used. You may combine with the luminescent color of the resin part 8 suitably.

  Further, the light emitting surfaces 10e, 10De, 10Ee, and 10Fe of the light guides 10, 10D, 10E, and 10F shown in FIGS. 13 to 16 and the light incident surfaces 11b, 11Db, and 11Eb and 11Fb are integrally connected, and the light guides 10, 10D, 10E, and 10F and the annular lenses 11, 11D, 11E, and 11F are integrally formed of a synthetic resin such as acrylic resin or polycarbonate. Good.

  Further, the bullet-shaped light emitting diode device 3 shown in FIGS. 3 and 6 may be replaced with the light emitting diode device 3B shown in FIG. 9 and the like, and the light emitting diode devices 3B and 3C shown in FIGS. .

  Furthermore, the light emitting diode illuminating devices 1, 1A, 1B, 1C, 1D, 1E, 1F emit light from the light emitting diode bare chips 3A1, 3B1, 3C1 to the light emitting diode devices 3, 3A, 3B, 3C, respectively. A dimming device for dimming may be provided.

The top view of the light-emitting-diode illuminating device which concerns on the 1st Embodiment of this invention. II arrow line view of FIG. III-III sectional view taken on the line of FIG. FIG. 2 is a schematic plan view showing a radiation direction of light from the light emitting diode device shown in FIG. 1. The light distribution distribution figure of the light-emitting-diode illuminating device shown in FIG. The principal part longitudinal cross-sectional view of the light-emitting-diode illuminating device which concerns on the 2nd Embodiment of this invention. The top view of the light emitting diode apparatus of the light emitting diode illuminating device which concerns on the 3rd Embodiment of this invention. The top view of the light emitting diode illuminating device which concerns on the 4th Embodiment of this invention. The top view of the light emitting diode apparatus shown in FIG. XX sectional drawing of FIG. FIG. 11 is an electrical wiring diagram of the light-emitting diode chip shown in FIGS. XII-XII sectional view taken on the line of FIG. The principal part longitudinal cross-sectional view of the light-emitting-diode illuminating device which concerns on the 5th Embodiment of this invention. The principal part longitudinal cross-sectional view of the light-emitting-diode illuminating device which concerns on the 6th Embodiment of this invention. The principal part longitudinal cross-sectional view of the light-emitting-diode illuminating device which concerns on the 7th Embodiment of this invention. The principal part longitudinal cross-sectional view of the light-emitting-diode illuminating device which concerns on the 8th Embodiment of this invention. The top view which shows other embodiment of the light emitting diode apparatus of this invention. The top view which shows other embodiment of the light emitting diode apparatus of this invention. The graph which shows the luminous intensity of the light emitting diode apparatus shown in FIG.

Explanation of symbols

  1, 1A, 1B, 1C, 1D, 1E, 1F... Light-emitting diode illuminating device, 2, 11, 11D, 11E, 11F. ... Projecting surface of the annular lens, 2c1... Total reflection surface on the inner periphery side of the annular lens, 2c2... Total reflection surface on the outer periphery side of the annular lens, 2d. 2d2: side surface on the inner peripheral side of the annular groove, 2d3: side surface on the outer peripheral side of the annular groove, 2o ... center hole, 2oA ... disk, 3, 3A, 3B, 3C ... light emitting diode device, 4 ... substrate, 3A1, 3B1, 3C1,5: Light-emitting diode bare chip, 10, 10D, 10E, 10F: Light guide, 10a, 10Da, 10Ea, 10Fa: Light guide body, 10d, 10Dd, 10Ed, 10Fd: Light input of light guide Surface, 10e, 10De, 10Ee, 10Fe ... Light exit surface of light guide, 11b, 11Db, 11Eb, 11Fb ... Light incident surface of annular lens, ga, gb ... Gap, 12 ... Inside condenser lens, 12a ... Inside Light emitting diode bare chip array, 13 ... outside condenser lens, 13a ... outside light emitting diode bare chip array.

Claims (11)

  1. An annular lens body, an annular groove formed on one end surface in the axial direction of the lens body, and light formed on at least the inner peripheral surface of the lens main body and incident on the inner surface is entirely directed to the light projecting surface. An annular lens having a total reflection surface for reflection;
    A plurality of light emitting diode devices optically disposed opposite the annular groove of the annular lens and disposed at a predetermined interval in the circumferential direction of the annular groove;
    A light-emitting diode illuminating device comprising:
  2. The light emitting diode illuminating device according to claim 1, wherein the annular lens is configured so that light transmission and irregular reflection are possible on an inner peripheral surface of the lens body.
  3. 3. The light-emitting diode illuminating device according to claim 1, wherein the annular lens includes a light-transmitting body that closes the annular center hole on a light projecting surface side on the other axial end side of the lens body. .
  4. An annular lens body, an annular groove formed on one end surface in the axial direction of the lens body, and light formed on at least the inner peripheral surface of the lens main body and incident on the inner surface is entirely directed to the light projecting surface. An annular lens having a total reflection surface for reflection;
    A plurality of light emitting diode bare chips that are optically arranged opposite to the annular groove of the annular lens and arranged annularly on the substrate at a predetermined interval in the circumferential direction of the annular groove and the outer surfaces of these light emitting diode bare chips are covered A light-emitting diode device having a translucent resin portion on which a translucent resin is disposed;
    A light-emitting diode illuminating device comprising:
  5. 5. The light emitting diode illuminating device according to claim 4, wherein the arrangement pitch P of the light emitting diode bare chips and the width direction dimension W of the resin portion have a relationship of P <2.multidot.W.
  6. 6. The light emitting diode illuminating device according to claim 4, wherein a gap is formed between the annular lens and the substrate.
  7. An annular lens body having an annular lens body, an annular light incident surface formed on one end surface of the lens body, and an annular light projecting surface formed on the other end surface of the lens body;
    An annular light emitting surface optically disposed opposite to the light incident surface of the annular lens, an annular light incident surface, and an annular light guide for guiding light incident on the light incident surface to the light emitting surface An annular light guide having;
    A light emitting diode device having a plurality of light emitting diodes arranged in a ring on the substrate so as to optically oppose the light incident surface of the light guide;
    A light-emitting diode illuminating device comprising:
  8. 8. The light-emitting diode illuminating device according to claim 7, wherein the light guide is formed such that the ring diameter thereof gradually decreases from one end on the light incident surface side toward the other end on the light output side.
  9. The light guide is formed such that the thickness of the light guide path in the radial direction gradually decreases from one end on the light incident surface side toward the other end on the light output surface side. The light-emitting diode illuminating device described.
  10. 10. The light-emitting diode illuminating device according to claim 7, wherein one end of the light guide surface side is integrally connected to a light incident surface side end portion of the annular lens.
  11. 11. The light emitting diode illumination device according to claim 7, wherein the light emitting diode device has a plurality of types of light emitting diodes having different emission colors.
JP2008020829A 2007-03-23 2008-01-31 Light emitting diode lighting system Pending JP2009009926A (en)

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