JP2010092765A - Illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to change light distribution characteristics without changing a white LED and a collecting lens or the like in an illumination device having the white LED as a light source. <P>SOLUTION: In the illumination device 10 equipped with a light-emitting diode (white LED) 11 to emit light emitted from a light-emitting part from a light-emitting face 11t of a phosphor 11a via the phosphor 11a, and a reflective member (light collecting lens) 12 to collect light by reflecting the light emitted from the light-emitting face 11t on a recess-shaped reflective face 12b, by a light-shielding member 13 which is arranged between the light-emitting face 11t and the reflective member 12 and separated from the light-emitting diode 11 and the reflective member 12, one part of light emitted from the light-emitting face 11t toward the reflective member 12 is made to pass through a light pass hole 13a, and the other light is shielded. In place of the light collecting lens 12 constituted of a transparent material, a reflector having a reflective recess face may be used. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  In recent years, in addition to incandescent bulbs and fluorescent lamps, so-called white light emitting diodes (hereinafter abbreviated as “white LEDs”) are used as light sources for illumination. The white LED is a light emitting device configured to generate light that is perceived as white light by human vision (hereinafter, simply referred to as “white light”), and each of the white LEDs is a monochromatic light having a relationship of three primary colors ( For example, three LEDs that generate red, green, and blue) are accommodated in one package, an LED that generates blue-ultraviolet monochromatic light (hereinafter referred to as a “blue LED”), and its complementary color. It is roughly divided into phosphors that emit fluorescence in a certain yellow region and are accommodated in one package. Among these, the white LED using the latter phosphor is often used as a light source of a lighting fixture because it has a simple structure and relatively good color rendering as compared with the former white LED.

  FIG. 3 is a cross-sectional view showing a basic configuration of a white LED using the above-described phosphor (hereinafter simply referred to as a white LED is a phosphor using a phosphor). The white LED 51 is configured as a surface-mounted light emitting device mounted on a printed wiring board PWB, and includes a phosphor layer 51a, a package body 51b, and a light emitting unit 51c. The light emitting unit 51c is a blue LED chip that generates blue monochromatic light Lb when a current is supplied to a pn junction (not shown), and is on the light emitting surface 51t side (upper surface in FIG. 3) of the package body 51b. It arrange | positions in the recessed part 51h which opens. The phosphor layer 51a is disposed so as to cover the light emitting part 51c in the recess 51h, and transmits part of the blue light Lb emitted from the light emitting part 51c, and is excited by the light Lb to emit yellow fluorescent light. It is a wavelength conversion member that generates Ly. Such a phosphor layer 51a is realized by, for example, a translucent resin mixed with a YAG (Yttrium Aluminum Garnet) phosphor. In addition, the light emitting unit 51c is realized by using, for example, an InGaN-based III-V group compound semiconductor. The white LED 51 includes a lead portion for supplying a current to the light emitting portion 51c, and the illustration and description thereof are omitted here.

  The white LED 51 is a mixture of blue-color monochromatic light Lb emitted from the blue LED chip forming the light-emitting portion 51c and yellow-color fluorescence Ly emitted from the phosphor layer 51a disposed so as to cover the light-emitting portion 51c. To generate white light. Therefore, of the surface of the phosphor layer 51a of the white LED 51, a region where both the blue light Lb emitted from the light emitting portion 51c and the yellow light Ly generated from the phosphor layer 51a are emitted is white light. It becomes the light emission surface 51t. In the white LED 51 shown in FIG. 3, almost the entire surface of the phosphor layer 51a located in the opening of the recess 51h serves as a light emitting surface 51t for white light.

  By the way, in the white LED 51, the light Lb in the blue region is emitted while spreading in a conical shape with a certain solid angle from the pn junction portion of the light emitting portion 51c (blue LED chip) which is a so-called dot-like region, and passes through the phosphor layer To do. In the white LED 51 shown in FIG. 3, the light in the blue region Lb emitted from the light emitting portion 51c is transmitted through the phosphor layer 51a and the surface of the phosphor layer 51a together with the yellow region Ly generated from the phosphor layer 51a. Is emitted as white light. Here, the region that forms the white light emitting surface 51t on the surface of the phosphor layer 51a is a region that substantially corresponds to the opening of the concave portion of the package body 51b in which the light emitting unit 51c is disposed, and typically A circular region having a diameter of about several mm is used. Therefore, in the white LED 51, the distance through which the light Lb in the blue region passes through the phosphor layer varies depending on the angle emitted from the light emitting unit 51c. As a result, the light Lb in the blue region included in the white light and the yellow region A “color unevenness” phenomenon occurs in which the ratio of the amount of light to the light Ly varies depending on the angle of emission. Specifically, this color unevenness appears as a phenomenon in which white light emitted from the outer peripheral portion of the phosphor layer is relatively yellowish than white light emitted from the central portion.

  FIG. 4 shows an example of a conventional white LED proposed for reducing color unevenness, an upper part is a plan view seen from the light emitting surface side, and a lower part is a cross-sectional view showing an internal configuration (Patent Document 1). . The white LED 61 includes a light shielding member (frame member) 61d in addition to the phosphor layer 61a, the package body 61b, and the light emitting portion (blue LED chip) 61c. The phosphor layer 61a has a uniform thickness and covers the upper surface of the package body 61b including the opening of the recess 61h in which the light emitting part 61c is disposed. The light shielding member (frame member) 61d is disposed on the surface of the phosphor layer 61a to be the light emitting surface 61t of white light, and has a yellowish white color emitted from the outer periphery of the light emitting surface 61t of the phosphor layer 61a. It is a member for blocking light.

  As shown in FIG. 4, the light shielding member 61d has a circular opening having a diameter substantially the same as the diameter of the circular opening of the recess 61h of the package body 61b. The white LED 61 is provided with the light shielding member 61d on the surface of the phosphor layer 61a, so that yellowish white light emitted from the outer periphery of the light emitting surface 61t of white light is irradiated on the irradiation surface side (in the lower part of FIG. 4). (Upward) is prevented from being released. Therefore, in the white LED 61, only the inner region of the circular opening of the light shielding member 61d in the phosphor layer 61a covering the opening of the recess 61h of the package body 61b serves as the light emitting surface 61t for white light. And according to the conventional white LED 61 shown in FIG. 4, white light preferable for illumination in which the uneven color phenomenon is suppressed can be obtained.

  FIG. 5 is a cross-sectional view showing an example of another conventional white LED proposed for reducing color unevenness (Patent Document 1). The basic configuration of the white LED 71 is the same as that of the conventional white LED 61 shown in FIG. 4, and the phosphor layer 71a, the package body 71b, the light emitting portion (blue LED chip) 71c, and the light shielding member (frame member). 71d. However, the phosphor layer 71a of the white LED 71 is not uniform in thickness, and the thickness decreases from the central portion toward the outer peripheral portion. That is, the distance through which the light Lb in the blue region emitted from the light emitting part 71c in the recess 71h of the package body 71b passes through the phosphor layer 71a is made different depending on the angle of emission. Accordingly, the ratio of the amount of light of the blue light Lb and the yellow light Ly included in the white light is not changed by the optical path of the blue light Lb. Therefore, according to the conventional white LED 71 shown in FIG. 5, the light shielding member 71d for preventing the yellowish white light emitted from the outer peripheral portion of the white light emitting surface 71t from being emitted to the irradiation surface side. In combination with the above, it is possible to obtain white light that is preferable for illumination in which the uneven color phenomenon is suppressed.

JP 2005-166734 A

  By the way, the characteristics required for the lighting device vary depending on the application. Therefore, in order to change the illuminance and light distribution characteristics of the illuminating device, the light source white LED, condensing lens and reflector (hereinafter referred to as “condensing lens”) are replaced with ones having different specifications. Ordinarily, the arrangement must be changed. For this reason, in order to manufacture a plurality of types of lighting devices having different characteristics, it is necessary to prepare a plurality of types of white LEDs and condenser lenses having different specifications, and to the following problems. Also often face.

  First, there is a problem caused by the fact that the form of the light emitting surface side of the surface-mounted white LED that is conventionally supplied is not unified. That is, as shown in FIGS. 3 to 5, the phosphor layer whose surface forms a white light emitting surface is recessed (concave) with respect to the upper surface of the package body, and is parallel and flat. There are various things such as a thing, and a protruding thing (convex shape). For this reason, in order to suppress the uneven color phenomenon, if a light shielding member that covers the outer peripheral portion of the light emitting surface is to be disposed directly on the phosphor layer, a light shielding member corresponding to the form on the light emitting surface side is prepared. A problem arises in that an operation for attaching the device to the upper surface of the package must be performed.

  In addition, the light distribution characteristics of a lighting device configured by combining a surface-mounted white LED and a condensing lens or the like are substantially determined by the characteristics of the condensing lens or the like. For this reason, in the conventional illuminating device, even when the irradiation angle is to be changed slightly, the condensing lens or the like has to be replaced with one having different characteristics. However, when changing a condenser lens or the like in a conventional illumination device, a plurality of factors such as the shape of the light emitting surface side of the white LED and the position of the light shielding member must be considered. There has been a problem that it is extremely difficult to change the light distribution characteristics of the lighting device after the condenser lens and the like are once determined.

  In view of such circumstances, an object of the present invention is to enable a light distribution characteristic to be changed without changing a white LED, a condensing lens, or the like in an illumination device using a white LED as a light source.

  In order to solve the above-described problems, the illumination device of the present invention includes a light emitting diode that emits light emitted from the light emitting unit from the light emitting surface of the phosphor through the phosphor, and a concave surface that emits light emitted from the light emitting surface. A reflecting member that reflects and collects light at the reflecting surface, and passes a part of the light emitted from the light emitting surface toward the reflecting member between the light emitting surface and the reflecting member through the light passage hole. A light shielding member for shielding the light is disposed, and the light shielding member is separated from the light emitting diode and the reflection member.

  In the above illumination device, it is preferable that the light shielding member is a member that shields light emitted from an outer peripheral portion of the light emitting surface.

  In the illumination device, the shape and size of the light passage hole of the light blocking member may be such that the light emitting unit is located inside the inner periphery of the light passage hole and outside the inner periphery. It is preferable that the outer peripheral edge of the light emitting surface is located.

  Moreover, in said illuminating device, it is preferable that the periphery of the said light passage part is arrange | positioned in contact with the said light-projection surface.

  Furthermore, in the above illumination device, it is preferable that the reflecting member is a bulk lens.

  As described above, according to the illumination device of the present invention, by appropriately changing the size and shape of the light passage hole of the light shielding member arranged between the light emitting surface and the condenser lens, the white LED and the reflective The light distribution characteristic can be changed without changing the member.

<First Embodiment>
A first embodiment of the present invention will be described with reference to the drawings.
<First embodiment>
The upper part of FIG. 1 is a cross-sectional view schematically showing a configuration of a lighting device 10 that is a first example of the lighting device as the first embodiment of the present invention. The illuminating device 10 includes a white LED 11 as a light source, a condenser lens 12 as a reflecting member that concentrates white light generated from the white LED 11 forward (to the right in FIG. 1), and an outer periphery of a light emitting surface of the white LED 11. And a light shielding member 13 that shields light emitted from the portion and traveling toward the condenser lens 12.

  The white LED 11 is a surface mount type (so-called chip type) light emitting device mounted on the surface of the printed wiring board PWB, and a phosphor layer 11a forming a light emitting surface 11t is formed on the front side of the package body 11b. . The light exit surface 11t has a circular shape when viewed from the front. The phosphor layer 11a covers a light emitting unit (blue LED chip) (not shown) disposed inside the package body 11b, and transmits a part of the monochromatic light Lb in the blue region emitted from the blue LED chip. At the same time, it is excited by the light Lb to generate a fluorescence Ly in the yellow region. The white LED 11 emits light Lb and light Ly, which are complementary to each other, from the light emitting surface 11t on the surface of the phosphor layer 11a, thereby generating light that is perceived as white light by human vision. Has been. An electrode for supplying a driving current for causing the blue LED chip to emit light is formed on the rear side of the white LED 11 (the side facing the phosphor layer 11a of the white LED 11), and this electrode is formed on the surface of the printed wiring board PWB. However, the illustration of electrodes, conductor patterns, drive circuits, etc. is omitted here.

  The condensing lens 12 is a bulk lens enriched with a transparent material. The condensing lens 12 has a rotating parabolic shape having a top on the rear side, and its optical axis is arranged coaxially with the optical axis of the white LED 11. The condensing lens 12 has a concave incident portion 12a on which light emitted from the white LED 11 is incident on the top. The side surface 12b of the rotating paraboloid-shaped condensing lens 12 functions as a concave parabolic reflecting surface that opens to the front side. That is, light oblique to the optical axis among the light incident from the incident portion 12a travels toward the side surface 12b through the transparent material constituting the condenser lens 12, and moves forward at the boundary surface between the transparent material and air. Are reflected, converged, and emitted from the emission part 12c. That is, the light emitted from the phosphor layer 11 a of the white LED 11 and incident on the incident portion 12 a is condensed forward by the condenser lens 12. Such a condensing lens 12 is produced, for example, by molding a transparent resin such as optical glass or polymethyl methacrylate (PMMA).

  The light shielding member 13 is a plate-like member having a light passage hole 13 a having a smaller diameter than the light emitting surface 11 t of the white LED 11, which is separate from the white LED 11 and the condenser lens 12. As shown in the upper part of FIG. 1, the light shielding member 13 is disposed between the phosphor layer 11 a of the white LED 11 and the incident portion 12 a of the condenser lens 12. And as shown in the lower stage of FIG. 1, it arrange | positions so that the outer peripheral part of the edge part 13b of the light passage hole 13a may cover the front side of the outer peripheral part of the light-projection surface 11t of white LED11. The light emitting part of the white LED 11 is located inside the inner peripheral edge of the light passage hole 13a. The shape of the light passage hole 13a is determined according to the shape of the light emission surface 11t of the white LED 11, and for example, when the light emission surface 11t is circular, a circle is preferable, and when the light emission surface 11t is rectangular. Is preferably rectangular. In the present embodiment, since the light exit surface 11t is circular, the light exit surface 11t is circular. The light shielding member 13 may be made of any material as long as it is opaque, but it is desirable that the material not be damaged by the heat generated from the white LED 11. Further, in order to prevent light emitted from the outer peripheral portion of the light emitting surface 11t of the phosphor layer 11a of the white LED 11 from being reflected by the light shielding member 13 and entering the condenser lens 12, the surface of the light shielding member 13 is made black. It is desirable.

  According to the illuminating device 10 described above, the light emitted from the outer peripheral portion of the light emitting surface 11t on the surface of the phosphor layer 11a of the white LED 11 toward the condensing lens 12 is shielded by the light shielding member 13, and the condensing lens 12 receives the light. In the light emitted from the light exit surface 11t, only the light that has passed through the light passage hole 13a is incident. As a result, light can be emitted from the condenser lens 12 with a light distribution characteristic with an illuminance angle smaller than that of the condenser lens 12. Moreover, since the light shielding member 13 is a separate member from the white LED 11 and the condenser lens 12, the shape of the light passage hole 13a is changed according to the form of the white LED, the light distribution characteristics of the condenser lens, and the like. It becomes easy to change to an optimal one so that a desired light distribution characteristic can be obtained by making it smaller than the illuminance angle of 12. Further, since the light shielding member 13 shields light emitted from the outer peripheral portion of the light emitting surface 11t toward the condenser lens 12, yellowish white light emitted from the outer peripheral portion of the light emitting surface 11t is collected. It can prevent entering into the optical lens 12, and can suppress generation | occurrence | production of the color nonuniformity of the light radiate | emitted from the condensing lens 12. FIG. In addition, by arrange | positioning the periphery of the light passage part 13a in contact with the light emission surface 11t, it is radiate | emitted from the condensing lens 12 compared with when the periphery of the light passage part 13a is separated from the light emission surface 11t. The illuminance angle of light can be increased. Further, with such an arrangement, the lighting device 10 can be made compact (low profile) in the optical axis direction.

Table 1 shows the relationship between the hole diameter (diameter: mm) of the light passage hole 13a of the light shielding member 13 and the irradiation angle in the illumination device 10. Here, “½ illuminance angle” means an angle at which the illuminance is 1/2 of the illuminance on the central axis of the lens on the irradiation surface 1 m away from the light emitting surface 11t of the white LED. It is expressed with an angle. The condensing lens 12 used in the first embodiment is a general-purpose product molded using a mold. The illuminance angle is about 15 °, the diameter of the incident portion 12a is about 8 mm, and the emitting portion 12c. Is about 23 mm in diameter. Moreover, the area | region which makes the light-projection surface 11t among the fluorescent substance layers 11a of white LED11 is a circular area | region with a diameter of about 4.3 mm. As can be seen from Table 1, by irradiating the condensing lens 12 by arranging the light blocking member 13 having the light passage hole 13a between the phosphor layer 11a of the white LED 11 and the incident portion 12a of the condensing lens 12. The corner can be changed apparently. Specifically, the 1/2 illumination angle of the condenser lens 12 can be reduced by reducing the diameter of the light passage hole 13a. The light passage hole 13a has a smaller diameter than the light emitting surface 11t of the white LED 11, and the light shielding member 13 is disposed so as to cover the front side of the outer peripheral portion of the light emitting surface 11t of the phosphor layer 11a. By disposing the member 13, the color unevenness of the white LED can be suppressed.

<Second embodiment>
Next, the illuminating device 20 which is the 2nd Example of the illuminating device as the 1st Embodiment of this invention is demonstrated. This illuminating device 20 has the same configuration as the illuminating device 10 shown in FIG. 1, and condenses the white LED 11 as a light source and the white light generated from the white LED 11 forward (rightward in FIG. 1). The lens 22 and the light shielding member 13 that covers the front side of the outer peripheral portion of the light emitting surface 11t of the white LED 11 are configured. That is, the illumination device 20 and the illumination device 10 are different only in that a condensing lens 22 is provided instead of the condensing lens 12. The condensing lens 22 is a general-purpose product molded using a mold, and has substantially the same shape and dimensions as the condensing lens 12, but the illuminance angle is about 1/2 due to the difference in the shape of the side surface 22b. It differs from the condensing lens 12 in that it is 30 °.

Table 2 shows the relationship between the hole diameter (diameter: mm) of the light passage hole 13a of the light shielding member 13 and the illuminance angle in the lighting device 20. As is clear from Table 2, also in the illuminating device 20 using the condensing lens 22 whose illuminance angle is about 30 °, the phosphor layer 11a of the white LED 11 and the incident portion 22a of the condensing lens 22 By reducing the diameter of the light passage hole 13a of the light shielding member 13 disposed therebetween, the ½ illuminance angle of the condenser lens 22 can be apparently reduced. Also in the lighting device 20, the light passing hole 13 a having a smaller diameter than the light emitting surface 11 t of the phosphor layer 11 a of the white LED 11 is disposed so as to cover the outer peripheral portion of the light emitting surface 11 t. By doing so, the color unevenness of white LED is also suppressed.

<Second Embodiment>
Next, the illuminating device 30 as the 2nd Embodiment of this invention is demonstrated. FIG. 2 is a cross-sectional view showing a main part of the illumination device 30 according to the second embodiment of the present invention. The illuminating device 10 and the illuminating device 20 as the first embodiment described above are both bulk lenses made of a transparent material as a reflecting member having a concave surface for collecting light emitted from the light emitting surface 11t of the white LED 11. Although a certain condensing lens is used, the reflecting member in the illumination device 30 according to the present embodiment is not limited to this. That is, as shown in FIG. 2, the illumination device may be configured by using a reflector 32 having, as a reflecting member, a concave paraboloid 32a having a paraboloid as a reflecting member. In the following description, the same reference numerals are used for portions common to the first embodiment, and the description thereof is omitted as appropriate.

  As described above, the illuminating device 30 includes the reflector 32 having the same shape as the side surfaces of the paraboloid of revolution instead of the condensing lenses 12 and 22 in the first embodiment. The reflector 32 can be obtained, for example, by providing a metal reflective layer on the surface (concave surface) of a metal molded body, a glass or synthetic resin molded body. A hole 32 a forming an incident portion is formed at the top of the reflector 32. The light emitted from the phosphor layer 11 a of the white LED 11 and entering the hole 32 a is condensed forward by the reflecting surface 32 b of the reflector 32.

  According to such an illuminating device 30, the illuminating device can be configured to be lighter by not including a condensing lens that is a bulk lens formed of a transparent material. Further, according to the illumination device 30, since the light emitted from the white LED 11 as the light source does not pass through the transparent material constituting the condensing lens as in the case of using a bulk lens type condensing lens, it is generated from the light source. Attenuation of light can be minimized.

As described above, the illumination device 10 (20, 30) according to the embodiment of the present invention emits light emitted from the LED chip, which is a light emitting unit, to the light of the phosphor layer through the phosphor layer, which is phosphor. In an illuminating device including a light emitting diode to be emitted from an emission surface and a reflection member that reflects and collects light emitted from the light emission surface by a concave reflecting surface, the light emission surface 11t on the surface of the phosphor layer 11 and the reflection A part of the light emitted from the light exit surface 11t toward the condenser lens 12 (the condenser lens 22 and the reflector 32) is transmitted between the condenser lens 12 (the condenser lens 22 and the reflector 32) as a member. A light blocking member 13 that blocks light from passing through the passage hole 13a is disposed. The light blocking member 13 is separate from the white LED 11 and the condensing lens 12 (the condensing lens 22 and the reflector 32) that are light emitting diodes. We are and.
By configuring the illumination device 10 (20, 30) in this way, the size and shape of the light passage hole 13a of the light shielding member 13 are appropriately changed, so that the white LED 11 and the condensing lens 12 (condensing lens 22, reflector) The light distribution characteristics can be changed without changing 32).

Moreover, in the illuminating device 10 (20, 30), it is preferable that the light shielding member 13 shields the light emitted from the outer peripheral portion of the light emitting surface 11t.
By configuring the illuminating device 10 (20, 30) in this way, the light that the light shielding member 13 emits toward the condenser lens 12 (the condenser lens 22 and the reflector 32) from the outer peripheral portion of the light exit surface 11t. Shield from light. For this reason, it is possible to prevent the yellowish white light emitted from the outer peripheral portion of the light exit surface 11t from entering the condenser lens 12 (the condenser lens 22 and the reflector 32). The occurrence of uneven color of the light emitted from the condenser lens 22 and the reflector 32) can be suppressed.

Further, in the lighting device 10 (20, 30), the shape and size of the light passage hole 13a of the light blocking member 13 is such that the light emitting portion that is an LED chip is located inside the inner periphery of the light passage hole 13a, and It is preferable that the outer peripheral edge of the light emitting surface 11t be positioned outside the inner peripheral edge of the light passage hole 13a.
By configuring the illuminating device 10 (20, 30) in this way, the amount of light incident on the condenser lens 12 (the condenser lens 22 and the reflector 32) is increased, and the light is emitted from the outer peripheral edge of the light exit surface 11t. Thus, the amount of yellowish white light incident on the condenser lens 12 (the condenser lens 22 and the reflector 32) can be reduced. For this reason, it is possible to change the light distribution characteristics of the light emitted from the condenser lens 12 (the condenser lens 22 and the reflector 32), and to suppress the occurrence of color unevenness.
For example, when two light emitting portions are provided and the light emitting surface 11t is substantially rectangular so as to cover these two light emitting portions, the light passage hole 13a is also a rectangle having the same shape as the light emitting surface 11t. Thus, the two light emitting portions are located inside the inner peripheral edge of the light passage hole 13a, and the outer peripheral edge of the light emitting surface 11t is easily located outside the inner peripheral edge of the light passage hole 13a.
In addition, when the three light emitting portions are respectively arranged at the vertex positions of the triangle and the light emitting surface 11t is a substantially triangular region covering these three light emitting portions, the light passage hole 13a has the same shape as the light emitting surface 11t. With the triangular shape, the three light emitting portions are positioned inside the inner peripheral edge of the light passage hole 13a, and the outer peripheral edge of the light emitting surface 11t is positioned outside the inner peripheral edge of the light passage hole 13a. easy.
Further, when the four light emitting portions are respectively arranged at the vertex positions of the quadrilateral and the light emitting surface 11t is a substantially quadrangular region covering these four light emitting portions, the light passage hole 13a has the same shape as the light emitting surface 11t. The four light emitting portions are positioned inside the inner peripheral edge of the light passage hole 13a, and the outer peripheral edge of the light emitting surface 11t is positioned outside the inner peripheral edge of the light passage hole 13a. easy.

Moreover, in the illuminating device 10 (20, 30), it is preferable that the periphery of the light passage part 13a is arrange | positioned in contact with the light-projection surface 11t.
By configuring the lighting device 10 (20, 30) in this way, if the size and shape of the light passage hole 13a are the same, the direction when the periphery of the light passage portion 13a is in contact with the light exit surface 11t is The illuminance angle of the light emitted from the condenser lens 12 (the condenser lens 22 and the reflector 32) can be made smaller than when the distance is far away.

  Moreover, in the illuminating device 10 (20), it is preferable that the condensing lens 12 (condensing lens 22) as a reflecting member is a bulk lens enriched with a transparent material.

<Other variations>
In the embodiment of the present invention described above, the case where the phosphor layer forming the light emitting surface of the surface-mounted white LED protrudes from the package body has been described. However, the present invention is applicable regardless of the form of the light emitting surface side of the white LED. For example, the white LED 51 shown in FIG. 3 can be used instead of the white LED 11 shown in FIGS. Moreover, the thing without the light shielding member 61d of the white LED 61 shown in FIG. 4 or the thing without the light shielding member 71d of the white LED 71 shown in FIG. 5 can be used. Of course, the present invention can also be applied to a case where a white LED as a light source is configured as a so-called bullet-type light emitting device.

  Further, in each of the above-described embodiments of the present invention, the case where the light emission surface made of the phosphor layer of the surface-mounted white LED is a circular region has been described. However, the shape of the light emitting surface of the white LED is not limited to a circle. For example, when a plurality of blue LED chips (pn junctions) are arranged inside the package body of one white LED, the shape of the light emitting surface may be rectangular. In that case, the shape of the light passage hole formed in the light shielding member may be rectangular according to the shape of the light exit surface.

  Furthermore, in embodiment of this invention mentioned above, one white LED with which an illuminating device is provided was demonstrated. However, the present invention can also be applied to a lighting device including a plurality of white LEDs and a reflecting member arranged by providing the light shielding member with a plurality of light passage holes according to the arrangement of the white LEDs and the reflecting member. . In that case, if the light shielding member is formed of a plate-like member, it is only necessary to arrange one light shielding member for the plurality of white LEDs and the reflecting member, so that the assembly of the lighting device becomes much easier than before. The technical effect is also expected.

It is a figure which shows typically the structure of the principal part of the illuminating device 10 and the illuminating device 20 as a 1st Embodiment of this invention, an upper stage is sectional drawing, and the lower stage is the plane which looked at the light-shielding member 13 from the irradiation surface side. FIG. It is sectional drawing which shows the principal part of the illuminating device 30 which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the internal structure of white LED using a fluorescent substance. It is a figure which shows an example of the conventional white LED, an upper stage is a top view which shows the structure of a light-projection surface, and a lower stage is sectional drawing which shows an internal structure. It is a figure which shows another example of the conventional white LED, and is sectional drawing which shows the structure which the fluorescent substance layer which makes a light-projection surface protrudes from the upper surface of a package main body.

Explanation of symbols

10, 20 Illumination device 11 White LED (LED having phosphor)
11a Phosphor layer 11b Package body 12, 22 Condensing lens (reflective member)
12a, 22a Incident part 12b, 22b Side surface (reflection concave surface)
12c, 22c Output part 13 Light shielding member 13a Light passage hole 13b Edge part 32 Reflector (reflective member)
32a Incident part 32b Reflective surface (reflective concave surface)
PWB printed wiring board

Claims (5)

A light emitting diode that emits light emitted from the light emitting portion from the light emitting surface of the phosphor through the phosphor, and a reflecting member that reflects and collects the light emitted from the light emitting surface by the concave reflecting surface; In a lighting device comprising:
A light-shielding member is disposed between the light-emitting surface and the reflective member, and a part of the light emitted from the light-emitting surface toward the reflective member is allowed to pass through the light passage hole and shields other light. The member is a separate body from the light emitting diode and the reflecting member.   The lighting device according to claim 1, wherein the light shielding member blocks light emitted from an outer peripheral portion of the light emitting surface.   3. The lighting device according to claim 1, wherein the light-transmitting hole has a shape and a size that the light-emitting portion is located inside an inner peripheral edge of the light-passing hole, and An illuminating device characterized in that an outer peripheral edge of the light emitting surface is located outside an inner peripheral edge.   4. The lighting device according to claim 1, wherein a peripheral edge of the light passage portion is disposed in contact with the light emitting surface. 5.   5. The lighting device according to claim 1, wherein the reflecting member is a bulk lens. 6.