JP4696780B2 - LED lighting fixtures - Google Patents

Description

  The present invention relates to an LED lighting apparatus using an LED as a light source.

  Conventionally provided LED lighting fixtures include an LED package having an LED chip as a light source, a wiring board on which the LED package is mounted, a fixture body that houses the wiring board, and light provided corresponding to the LED chip. There are those equipped with a control lens, and in such LED lighting fixtures, various kinds of light distribution and irradiation pattern variations caused by a deviation between the optical axis of the LED chip and the optical axis of the lens are variously used. Ingenuity has been made.

  For example, an LED lighting apparatus is provided in which a lens is fixed to an LED package using a lens holding member so that the optical axis of the LED chip and the optical axis of the lens coincide with each other (Patent Document 1).

Further, in Patent Document 1, instead of providing the lens holding member as described above, an LED lighting device in which a guide portion is provided as a positioning portion at the lower end of the lens and a step is provided on the outer periphery of the upper surface of the LED package. In this example, the LED chip is fixed by bonding the lens and the LED package with an adhesive in a state in which the guide portion protruding from the lower end of the lens and the step of the LED package are fitted in an uneven shape. The optical axis of the lens is made to coincide with the optical axis of the lens.
Japanese Patent Laying-Open No. 2005-158963 (FIG. 7)

  In the former LED lighting apparatus, although the LED chip and the lens can be positioned, since the lens holding member is newly provided, the material cost for the lens holding member is required, and the LED chip and the lens are interposed via the lens holding member. Since these are indirectly fitted, there is a problem that they are affected by molding errors of the lens holding member. Furthermore, when the light transmitted through the lens is reflected by the lens holding member and transmitted through the lens again, there is a problem in that the light travels in an unintended direction and uneven illumination occurs (the outgoing light distribution becomes distorted). It was.

  In the latter LED lighting apparatus, since the LED chip and the lens are positioned by the guide portion formed by extending the lower end of the lens and the step provided on the LED package without using the lens holding member, a new lens holding member is used. The material cost can be reduced as compared with the case where the lens is provided, and the lens and the LED package are directly fitted, so that the former problem can be solved and the positioning accuracy can be improved.

  However, in the latter case, the guide part protruding from the lower end of the lens is a part for fitting with the LED package, so it does not contribute to the light distribution of the LED chip, and the guide part of such a lens. Since the light incident on the light is wasted, there is a problem that the light use efficiency deteriorates.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an LED lighting apparatus capable of positioning a lens and an LED package and improving light utilization efficiency.

In order to solve the above-mentioned problems, in the invention of the LED lighting apparatus according to claim 1, a rectangular parallelepiped LED package including an LED chip as a light source and the LED package are arranged , and gradually become narrower toward the bottom side. A concave portion formed in the shape of a truncated cone, and at least a lens disposed on the optical axis of the LED package, and the corner portion of the LED package is in surface contact with the inner peripheral surface of the concave portion of the lens. A tetrahedral cutout for positioning the LED package and the lens is provided so that the optical axis of the chip and the optical axis of the lens coincide with each other.

  In the present invention, since the notch portion that fits the edge portion of the LED package is provided on the inner peripheral surface of the concave portion of the lens, the positional deviation between the LED package and the lens is prevented, and the optical axis of the LED chip and the lens The optical axis of the LED package and the lens can be held in an aligned state, and the positioning of the LED package and the lens is performed between the edge of the LED package and the notch provided in the lens. Unlike the case where a positioning portion is provided on the lens, it is not necessary to provide the lens with a portion where the incident light is wasted. This has the effect of improving the light utilization efficiency of the LED chip.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description, the upper side of FIG. 1A is the upper side of the LED lighting fixture, and the lower side of FIG. 1A is the lower side of the LED lighting fixture.

  As shown in FIG. 1A, the LED lighting apparatus of the present embodiment includes an LED package 1 including an LED chip 10 as a light source, and a printed circuit board (not shown) on which electronic components including the LED package 1 are mounted. And an instrument body (not shown) having an opening for emitting the light of the LED package 1 outward, and a recess 20 in which the LED package 1 is disposed. The lens 2 includes a light distribution lens 2 disposed on the optical axis X of the LED package 1, a power supply device (not shown) for supplying operation power to the LED package 1, and the like. The concave portion 20 of the LED package 1 is fitted to the corner portion 11b, which is the edge portion of the LED package 1, so that the optical axis X of the LED chip 10 and the optical axis Y of the lens coincide with each other. Notch for positioning the cage 1 and the lens 2 21 ... are provided.

  As shown in FIG. 1B, the LED package 1 is mainly composed of an LED chip 10 and a package body 11 that houses the LED chip 10, and in addition, a light diffusion that diffuses the light of the LED chip 10. A member (not shown), a wavelength conversion member (not shown) that converts light of the LED chip 10 into light of a predetermined wavelength, and the like are accommodated in the package body 11 depending on the situation.

  The package main body 11 is formed in a rectangular parallelepiped box shape having an upper surface opened using ceramics, synthetic resin, or the like, and the LED chip 10 is accommodated in the inside 11a. The package body 11 includes electrodes (not shown) that are electrically connected to the respective poles of the LED chip 10. These electrodes (not shown) are made of Ni or Au, and are used for the package body 11. It is formed so as to extend from the bottom surface of the interior 11 a to the outer surface of the package body 11. The four corners 11 b on the upper surface side of the package body 11 are used for positioning with the lens 2.

  The lens 2 is formed in a substantially hemispherical shape by, for example, injection molding a translucent resin such as an epoxy resin, and a concave portion 20 in which the LED package 1 is disposed is provided at a lower end portion thereof. The concave portion 20 is a cylindrical concave portion that gradually decreases in diameter as it goes upward with the optical axis Y of the lens 2 as the central axis, and is formed to have a size that can accommodate at least the upper surface side of the LED package 1. Yes. Then, on the inner peripheral surface of the concave portion 20 of the lens 2, the portions corresponding to the four corners 11b of the package main body 11 are respectively fitted with projections and depressions on the corners 11b, so that the optical axis X of the LED chip 10 A substantially tetrahedral cutout portion 21 for positioning the LED package 1 and the lens 2 is provided so that the optical axis Y of the lens coincides.

  The LED lighting apparatus of the present embodiment includes the LED package 1 and the lens 2 described above, and the LED package 1 and the lens 2 are arranged such that the upper surface side of the LED package 1 is disposed in the concave portion 20 of the lens 2. The four corners 11b of the LED package 1 are positioned by engaging the four cutouts 21 of the lens 2 respectively so that the optical axis X of the LED chip 10 and the optical axis Y of the lens 2 coincide with each other. Will be held at.

  As described above, according to the LED lighting apparatus of this embodiment, the optical axis X of the LED chip 10 and the lens are fitted to the corner portion 11b of the LED package 1 on the inner peripheral surface of the concave portion 20 of the lens 2. Since the notch 21 for positioning the LED package 1 and the lens 2 is provided so that the optical axis Y of the LED 2 coincides with the optical axis Y of the LED chip 10, the positional deviation between the LED package 1 and the lens 2 is prevented, and A state in which the axis X and the optical axis Y of the lens 2 coincide with each other can be maintained. In addition, since the LED package 1 and the lens 2 are directly fitted without interposing other members, for example, the lens and the LED package can be connected via a lens holding member or an instrument body as in the past. Unlike the case of positioning, it is not affected by molding errors of other members, so that positioning accuracy can be improved.

  Furthermore, in this embodiment, since the LED package 1 and the lens 2 are positioned by the notch portion 21 provided in the lens 2, a guide portion which is a positioning portion is provided on the lens as in the conventional example described above. Unlike the case of protruding, it is not necessary to provide the lens 2 with a portion where incident light is wasted (positioning portion in the above-described conventional example), thereby improving the light use efficiency of the LED chip 10. be able to. In addition, by providing the lens 2 with the notch portion 21 that is unevenly fitted to the corner portion 11b of the LED package 1, it is not necessary to form a step or the like in the LED package as in the conventional example. The package can be used as it is, and thereby the manufacturing cost can be reduced.

  In addition, since the position of the notch portion 21 is set so that the LED package 1 and the lens 2 are fitted in a portion below the upper surface of the package main body 11 serving as a light emitting surface of the LED package 1, the LED package 1. It is possible to prevent the light from the LED chip 10 from being blocked by the fitting portion between the lens 2 and the lens 2, thereby preventing the light use efficiency from deteriorating.

  By the way, the LED lighting apparatus of the present embodiment is not limited to the example shown in FIGS. 1A and 1B. For example, as shown in FIGS. May also be used as a notch.

  That is, the lens 3 shown in FIG. 2B is a plano-convex lens formed by injection-molding a translucent resin such as an epoxy resin, for example. A rectangular parallelepiped concave portion 30 is provided to fit with the upper surface side of the package body 11. Such a lens 3 and the LED package 1 are positioned by fitting the upper surface side of the LED package 1 into the concave portion 30 of the lens 3 as shown in FIG. The optical axis X and the optical axis Z of the lens 3 are held in alignment. Therefore, also in the example shown in FIG. 2, the same effect as the example shown in FIG. 1 can be obtained.

  On the other hand, the example of the LED lighting fixture using the lens 4 and the LED package 5 as shown to Fig.3 (a), (b) is also considered.

  In this case, as shown in FIG. 3B, the lens 4 is formed in a substantially hemispherical shape by injection-molding a translucent resin such as an epoxy resin, and the LED package 5 is disposed at the lower end thereof. A recessed portion 40 is provided. Further, the concave portion 40 is formed in a columnar shape that gradually becomes narrower as it goes upward with the optical axis Y of the lens 4 as the central axis.

  As shown in FIG. 3B, the LED package 5 is mainly composed of an LED chip (not shown) and a package body 50 that houses the LED chip. The package body 50 is formed in a rectangular parallelepiped box shape with an upper surface opened using ceramics or synthetic resin, and an LED chip is accommodated in the interior 50a. The package body 50 includes electrodes (not shown) that are electrically connected to the respective poles of the LED chip. These electrodes (not shown) are made of Ni or Au, and are used as the inside of the package body 50. It is formed so as to extend from the bottom surface of 50a to the outer surface of the package body 50. In addition, the edge of the upper surface portion of the package body 50 is cut out so as to have a substantially columnar fitting portion 50b that fits with the concave portion 40 of the lens 4 at the substantially central portion thereof.

  The lens 4 and the LED package 5 are positioned by fitting the fitting portion 50b of the LED package 5 into the concave portion 40 of the lens 4 as shown in FIG. The optical axis X and the optical axis Y of the lens 4 are held in alignment.

  Therefore, in the example shown in FIG. 3 as well, as in the example shown in FIG. 1, the positional deviation between the LED package 5 and the lens 4 is prevented, and the optical axis X of the LED chip and the optical axis Y of the lens 4 coincide. Can be maintained. Moreover, since the LED package 5 and the lens 4 are directly fitted without interposing other members, there is no influence of molding errors of other members, thereby improving the positioning accuracy. be able to.

  Furthermore, by providing a fitting portion 50b for fitting with the concave portion 40 of the lens 4 on the upper surface portion of the LED package 5, it becomes unnecessary to form a positioning guide portion or the like on the lens as in the conventional example. The used lens can be used as it is, and thereby the manufacturing cost can be reduced. In addition, since it is not necessary to provide the lens 4 with a portion where incident light is wasted (the positioning portion in the above-described conventional example), it is possible to improve the light utilization efficiency of the LED chip. In addition, since the LED package 5 and the lens 4 are fitted to each other at a position below the upper surface of the package body 50, which is the light emitting surface of the LED package 5, the light from the LED chip is blocked by such a fitting position. Therefore, it is possible to prevent the light use efficiency from deteriorating.

  In the example of FIGS. 1 to 3 described above, the package body and the lens of the LED package are separated from each other. However, they may be formed continuously and integrally, and the package body and the lens may be integrated. By doing so, the manufacturing cost can be reduced.

  In addition, the shape of the LED package and the lens is not limited to the above example, and a suitable one can be used depending on the situation.

(A) is a perspective view of the principal part of an example of the LED lighting fixture of this invention, (b) is an exploded perspective view same as the above. (A) is a perspective view of the principal part of the other example of the LED lighting fixture of this invention, (b) is an exploded perspective view same as the above. (A) is a perspective view of the principal part of the further another example of the LED lighting fixture of this invention, (b) is an exploded perspective view same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED package 10 LED chip 11 Package main body 11b Corner | angular part 2 Lens 20 Recessed part 21 Notch part X, Y Optical axis

Claims (1)

A rectangular parallelepiped LED package including an LED chip as a light source;
The LED package is disposed , and has at least a lens disposed on the optical axis of the LED package, having a concave portion formed in a truncated cone shape that gradually decreases in diameter toward the bottom surface side .
A tetrahedral notch that positions the LED package and the lens so that the corners of the LED package are in surface contact with the inner peripheral surface of the concave portion of the lens so that the optical axis of the LED chip and the optical axis of the lens coincide with each other. The LED lighting fixture characterized by providing the part.

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