JP2005174693A - Lens for light emitting element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens for light-emitting element superior in perceptivity not only from a short distance but also from a long distance and also superior in the angle of field property. <P>SOLUTION: This is a lens 1 for light-emitting element in which the light emitted from the light-emitting element 2 arranged at the light-emitting mounting part 3 formed at the bottom of the lens body is totally reflected by the circumference wall 4 of the lens body and is irradiated frontward. Corner parts 7, 8 are provided which become a boundary which is formed when the angle to the center axis of the lens body is made smaller step by step from the bottom toward the front face 5 of the lens body, and these corner parts provided scatters the light from the light-emitting element 2 toward the front and irradiate in a concentric circle form when viewed from the front of the lens. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a condensing lens that covers and arranges an upper portion of a light emitting element such as an LED (light emitting diode) chip used in a display device or the like, and focuses light from the light emitting element. The present invention relates to a lens for a light-emitting element that can be efficiently and suitably irradiated with a wide light-emitting area.

Originally, the light emitting area of the light emitting element such as LED is pinpoint, and if it is left as it is, it becomes non-directional illumination and the light diffuses, and a light emitting surface of a certain area cannot be formed, and from a long distance. Therefore, a condensing lens for converging light is usually provided covering the front of the light emitting element. This condensing lens forms a light emitting element mounting portion at the bottom, and is a wall surface that draws a parabolic curve from the bottom toward the front, and totally reflects light from the light emitting element and radiates it forward.
Japanese Utility Model Publication No. 6-28725

  However, in the conventional light emitting element lens described above, the light from the light emitting element is surely converged to suppress light scattering, and the light is irradiated straight forward. On the contrary, there is a problem that the viewing angle, which is a visible range, is narrowed by suppressing light scattering. In particular, when used as a display device, a wide viewing angle as well as visibility from a long distance is an important point.

  Therefore, in order to solve the above-described problems, the present invention has an object to provide a lens for a light-emitting element that has excellent visibility from a long distance as well as a short distance and an excellent viewing angle characteristic.

  In order to achieve the above object, the lens for a light emitting element of the present invention radiates the light emitted from the light emitting element disposed in the light emitting element mounting portion formed at the bottom of the lens body to the front by totally reflecting the light from the peripheral wall of the lens body. One or a plurality of corner portions formed by changing the angle with the central axis of the lens body from the bottom portion to the lens front surface is provided on the peripheral wall of the inverted frustoconical light emitting element lens. Thus, the light from the light emitting element is scattered at the front corners and is irradiated concentrically as viewed from the front of the lens.

  A convex lens portion is formed in a protruding manner at the center of the front surface of the lens.

  In addition, a convex lens portion is formed to project at the center of the front surface of the lens, and a convex line having a semispherical cross section is formed to project around the outer periphery of the convex lens portion.

  According to the light emitting element lens of the present invention, the inverted frustoconical shape that radiates the light emitted from the light emitting element disposed in the light emitting element mounting portion formed at the bottom of the lens body to the front by being totally reflected by the peripheral wall of the lens body. The peripheral wall of the light emitting element lens is provided with one or a plurality of corner portions formed by changing the angle with the central axis of the lens body from the bottom portion to the lens front surface. The provided corners scatter the light from the light emitting element to the front surface and irradiate it concentrically when viewed from the front of the lens. As a result, the front surface of the lens is totally reflected by the peripheral wall, and the planar light. Light irradiation combined with brighter concentric ring light can be obtained, and excellent visibility can be obtained not only at a short distance but also at a long distance by this ring light.

  In addition, by forming a convex lens at the center of the front of the lens, the light that directly passes through the center of the lens without being reflected by the lens peripheral wall is converged by the convex lens, further reducing the diffusion and moving far away Can be irradiated with light. Furthermore, at the boundary between the front surface of the lens and the convex lens portion, more light from the light emitting element gathers than the other parts and is irradiated to the front surface as a bright ring light. Visibility is improved.

  In addition, a convex lens portion is formed to project at the center of the front surface of the lens, and a convex shape having a semispherical cross section is formed to project around the outer periphery of the convex lens portion so that it does not reflect on the lens body peripheral wall. And the light which permeate | transmits the outer periphery of a convex lens part converges with the said convex strip | line without passing a convex lens part, and can further irradiate light farther, suppressing further diffusion. The boundary between the front surface of the lens and the convex stripes is formed concentrically in a double shape, so that more light from the light-emitting elements gathers than the other parts to illuminate the front surface as bright ring light. More light from the element gathers than other parts and becomes a bright ring light, which is irradiated on the front surface, further improving the visibility at a long distance as well as at a short distance.

  1 to 2 show a light-emitting element lens 1 according to a first embodiment of the present invention. The light-emitting element lens 1 obtained by molding a transparent synthetic resin material into a substantially truncated cone shape is shown in FIG. A light emitting element mounting portion 3 for arranging the light emitting element 2 such as an LED is formed on the bottom, and the angle of the peripheral wall 4 with the central axis of the lens is reduced in three steps from the light emitting element mounting portion 3 to the lens front surface. Further, a convex lens portion 6 (R5.78) having a convex front portion having a diameter smaller than the width diameter of the lens front surface 5 is formed in a projecting manner at the center portion. The front surface 5 of the lens has a shape in which the outer peripheral edge slightly protrudes in a fringe shape and expands. The three-step inclined portion of the peripheral wall 4 has angles of 40.61 °, 32.19 °, and 26.87 ° from the bottom to the front of the lens, respectively (of course, angles other than these may be used). ). Then, bright concentric ring lights are irradiated from the peripheral corner portions 7 and 8 which are the boundaries of the three-stage inclined portions as viewed from the front of the lens.

  3 to 4 show a light emitting element lens 11 according to a second embodiment of the present invention. The light emitting element lens 11 obtained by molding a transparent synthetic resin material into a substantially truncated cone shape is shown in FIG. A light emitting element mounting portion 12 for disposing the light emitting element 2 such as an LED is formed on the bottom, and the angle of the peripheral wall 13 with the central axis of the lens is reduced in three steps from the light emitting element mounting portion 12 to the lens front surface. In the same manner as in the first embodiment described above, the three-step inclined portion of the peripheral wall 13 has angles of 40.61 ° and 32.19 ° with respect to the central axis of the lens from the bottom to the front of the lens, respectively. 26.87 ° (of course, angles other than these may be used). Further, the front surface 14 of the lens is a flat surface (the outer periphery of the lens 14 is widened by slightly projecting in a fringe shape), and a front portion having a diameter smaller than the width of the front surface 14 of the lens is convex at the center. The convex lens portion 15 is formed in a projecting manner, and the curvature is reduced in the middle portion from the proximal end portion to the distal end portion, the curvature of the proximal end portion is R5.14, and the curvature of the distal end portion is R4.65. Then, bright concentric ring lights as viewed from the front of the lens are irradiated from the peripheral corners 16 and 17 which are the boundaries of the three-stage inclined portions and the boundary 18 of the curvature of the convex lens portion 15.

  5 to 6 show a light emitting element lens 21 according to a third embodiment of the present invention. This light emitting element lens 12 arranges the light emitting element lens 1 according to the first embodiment described above. A light emitting element mounting portion 22 for disposing a light emitting element 2 such as an LED is formed at the bottom, and the peripheral wall 23 has an angle with the central axis of the lens 3 extending from the light emitting element mounting portion 22 to the lens front surface. The three-step inclined portion of the peripheral wall 23 has angles of 40.61 °, 32.19 °, and 26.87 ° from the bottom to the front of the lens, respectively. (Of course, angles other than these may be used). Further, the front surface 24 of the lens is a flat surface, and a convex lens portion 25 having a convex front that is smaller than the width diameter of the front surface 24 of the lens is projectingly formed at the center thereof, and the outer periphery of the convex lens portion 25 is hemispherical in cross section. The protrusions 26 are formed so as to project in a circular shape. The concentric ring light that is bright when viewed from the front of the lens is obtained from the boundaries 29 and 30 between the peripheral corners 27 and 28 that are the boundaries of the three-stage inclined portions and the lens front surface 24 of the ridge 26. Is irradiated.

  In the above-described embodiment, two corners serving as boundaries between the inclined portions formed on the lens peripheral wall are provided. However, the present invention is not limited to this, and may be one or more than three. It is.

It is a perspective view which shows the 1st Example of the lens for light emitting elements of this invention. It is a longitudinal cross-sectional view which shows the 1st Example of the lens for light emitting elements of this invention. It is a perspective view which shows the 2nd Example of the lens for light emitting elements of this invention. It is a longitudinal cross-sectional view which shows the 2nd Example of the lens for light emitting elements of this invention. It is a perspective view which shows the 3rd Example of the lens for light emitting elements of this invention. It is a longitudinal cross-sectional view which shows the 3rd Example of the lens for light emitting elements of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting element lens 2 Light emitting element 3 Light emitting element attaching part 4 Peripheral wall 5 Lens front surface 6 Convex lens part 7, 8 Corner | angular part 11 Light emitting element lens 12 Light emitting element attaching part 13 Perimeter wall 14 Lens front 15 Convex lens part 16, 17 Corner | angular part 21 Lens for light emitting element 22 Light emitting element mounting portion 23 Peripheral wall 24 Lens front surface 25 Convex lens portion 26 Convex stripes 27, 28 Corners 29, 30 Boundary

Claims (3)

  On the peripheral wall of the inverted frustoconical light emitting element lens that radiates the light emitted from the light emitting element disposed on the light emitting element mounting portion formed on the bottom of the lens body to the front by totally reflecting the peripheral light of the lens body, One or a plurality of corner portions formed by changing the angle with the central axis of the lens body from the bottom portion to the lens front surface are provided at one or a plurality of corners, so that the light from the light emitting element is provided around the corners. A lens for a light-emitting element, characterized in that the portion is scattered on the front surface and irradiated concentrically as viewed from the front of the lens.   2. The lens for a light emitting element according to claim 1, wherein a convex lens portion is formed so as to protrude from a central portion of the front surface of the lens.   2. A light emitting device according to claim 1, wherein a convex lens portion is formed in a projecting manner at the center of the front surface of the lens, and a convex shape having a hemispherical cross section is formed in a projecting manner on the outer periphery of the convex lens portion. Lens.

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