JP2015222629A - Ornament lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ornament lighting device capable of restricting occurrence of "point lighting".SOLUTION: This invention relates to an ornament lighting device comprising: an LED light source 2; a light guide body 3 including a first incident plane 3a opposing against the LED light source 2, a first reflection plane 3b arranged on a light axis X of the LED light source 2 and second reflection planes 3e arranged at both sides of the light axis X. The light guide body 3 is provided with a second incident plane 3c onto which light L3 advancing straight in parallel with the light axis X of the LED light source 2 on the first reflection plane 3b is incident. Particularly, the light guide body 3 is formed with an open hole 4 having a fan shape as seen from the front, two planes forming a V-shape of the open hole 4 are applied as the first reflection plane 3b, an arcuate outer circumferential surface of the open hole 4 is applied as the second incident plane 3c. In addition, a shape of the side section of the second incident plane 3c is applied as an arcuate convex curved surface, or the second incident plane 3c is formed into a knurl or a prism shape.

Description

  The present invention relates to a decorative lighting device including an LED light source and a light guide.

  For example, a combination of an LED light source and a light guide (lens body) is known as a decorative illumination device used for illumination of a game machine or various amusements (see Patent Documents 1 and 2). Here, an example of such a decorative lighting device is shown in FIG.

  That is, FIG. 7 is a front view of a conventional decorative illumination device, and the decorative illumination device 101 shown in the figure includes an LED light source 102 and a light guide 103 that has a T-shape when viewed from the front. Here, the light guide 103 includes a convex curved incident surface 103a facing the LED light source 102, a V-cut first reflecting surface 103b disposed on the optical axis X of the LED light source 102, and an optical axis. The second reflecting surfaces 103e arranged on both sides of X are provided, and each second reflecting surface 103e is prism-cut.

  In the decorative lighting device 101 configured as described above, when the LED light source 102 is turned on, the light emitted from the LED light source 102 enters the light guide 103 from the incident surface 103a of the light guide 103 and enters the LED. The light travels parallel to the optical axis X of the light source 102, is reflected at a right angle by the first reflecting surface 103b and travels horizontally to the left and right, and then is reflected and refracted by the second reflecting surface 103e again at a right angle. As shown in Fig. 5, the light is emitted from the light guide upward in parallel with the optical axis X and used for decoration illumination. In

JP 2012-099400 A JP 2012-155903 A

  However, in the decorative illumination device 101 shown in FIG. 7, the light L3 that enters the light guide 103 and travels straight on the optical axis X travels straight without being reflected by the first reflecting surface 103b and the second reflecting surface 103e. Therefore, there is a problem that “spot light” occurs in which the central portion of the light guide body 103 shines stronger than other portions. This phenomenon is mainly caused by the manufacturing limit of the V-cut apex of the first reflecting surface 103b.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a decorative lighting device that can suppress the occurrence of “lighting”.

  In order to achieve the above object, an invention according to claim 1 is arranged on both sides of an LED light source, an incident surface facing the LED light source, a first reflecting surface disposed on the optical axis of the LED light source, and the optical axis 1. In the decorative lighting device configured to include a light guide having the second reflection surface, the light emitted from the light guide to the first reflection surface in a straight line parallel to the optical axis of the LED light source. The second incident surface for allowing the light to enter again is provided.

  The invention according to claim 2 is the invention according to claim 1, wherein the light guide is formed with a fan-shaped through hole in front view, and two planes forming a V-shape of the through hole are the first reflecting surface, The arcuate outer peripheral surface of the through hole is the second incident surface.

  According to a third aspect of the present invention, in the second aspect of the present invention, the two planes forming the V shape of the second incident surface are connected by an arc curved surface or a flat surface.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the side cross-sectional shape of the second incident surface is an arc convex curved surface.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, characterized in that the second incident surface has a knurled or prism shape.

  According to the present invention, out of the light incident on the light guide from the first incident surface of the light guide, the light traveling straight without being reflected by the first reflection surface is once emitted to the outside of the light guide. Since the light enters the light guide again from the second incident surface, diffuses on the second light incident surface, and then exits the light guide, the occurrence of “spotlight” in which the central portion of the light guide shines strongly is suppressed.

It is a front view of the decorative illuminating device which concerns on Embodiment 1 of this invention. It is the sectional view on the AA line of FIG. It is a perspective view of the light guide of the decorative illuminating device which concerns on Embodiment 2 of this invention. It is a front view of the decorative illuminating device which concerns on Embodiment 2 of this invention. It is the BB sectional view taken on the line of FIG. It is a front view which shows the modification of the decorative lighting apparatus which concerns on Embodiment 2 of this invention. It is a front view of the conventional decorative lighting apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a front view of a decorative lighting device according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and the decorative lighting device 1 according to the present embodiment includes an LED light source 2 and The light guide 3 has a T-shape when viewed from the front.

  The light guide 3 is integrally formed with a transparent resin such as acrylic in a T-shape when viewed from the front, and the lower surface of the light guide 3 facing the LED light source 2 of the vertical portion 3A extending in the vertical direction has a circular curved surface. The 1st incident surface 3a of a shape is comprised. And it is the horizontal part 3B extended horizontally from the upper end part of the vertical part 3A of this light guide 3 to right and left, Comprising: On the optical axis X (left-right direction center part) of the LED light source 2, as shown in FIG. A front-view fan-shaped through-hole 4 is formed. The two V-shaped planes of the through hole 4 constitute a first reflecting surface 3b, and the arcuate outer peripheral surface of the through hole 4 constitutes a second incident surface 3c. Here, as shown in FIG. 2, the side sectional shape of the second incident surface 3c is an arc convex curved surface (R shape). Further, as shown in FIG. 1, two V-shaped planes constituting the first reflecting surface 3b are connected by an arc concave curved surface 3d.

  As shown in FIG. 1, the inclined lower surfaces of the left and right sides of the optical axis X of the horizontal portion 3B of the light guide 3 constitute a second reflecting surface 3e, and the second reflecting surface 3e includes a prism. A cut has been made.

  In the decorative lighting device 1 configured as described above, when the LED light source 2 is turned on, the light emitted from the LED light source 2 enters the light guide 3 from the first incident surface 3 a of the light guide 3. 1 and FIG. 2, the light is reflected by the first reflecting surface 3b at a right angle and horizontally traveled left and right, and then reflected by the second reflecting surface 3e at a right angle again. As shown by L1 and L2 in FIG. 1, the light is emitted from the light guide 3 and used for decorative illumination.

  Of the light emitted from the LED light source 2 and entering the light guide 3 from the first incident surface 3a of the light guide 3, the light is not reflected by the first reflection surface 3b and is reflected on the optical axis X of the LED light source 2. The light that travels straight along the light exits from the light guide 3 through the through-hole 4 and then enters the light guide 3 again from the second incident surface 3c. This is indicated by L3 in FIGS. As described above, the light is diffused left and right and front and rear (left and right in FIG. 2) on the second incident surface 3c and emitted from the light guide 3. For this reason, generation | occurrence | production of the "spot light" in which the center part of the light guide 3 shines stronger than another part is suppressed effectively.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  3 is a perspective view of a light guide body of the decorative illumination device according to Embodiment 2 of the present invention, FIG. 4 is a front view of the decorative illumination device, and FIG. 5 is a cross-sectional view taken along line BB in FIG. In the figure, the same elements as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the repetitive description thereof will be omitted below.

  The decorative illumination device 1 ′ according to the present embodiment is characterized in that the second incident surface 3 c of the light guide 3 has a knurled or prism shape, and the other configuration is the decorative illumination device according to the first embodiment. Same as that of 1.

  Thus, also in the decorative illumination device 1 ′ according to the present embodiment, out of the light emitted from the LED light source 2 and entering the light guide 3 from the first incident surface 3 a of the light guide 3. The light that travels straight along the optical axis X of the LED light source 2 without being reflected by the first reflecting surface 3b is once emitted to the outside of the light guide 3 through the through-hole 4, and then from the second incident surface 3c into the light guide 3 However, the light is diffused left and right and front and rear (left and right in FIG. 5) on the second incident surface 3c and emitted from the light guide 3 as indicated by L3 in FIGS. Here, in the present embodiment, since the second incident surface 3c of the light guide 3 has a knurled or prism shape, light is more effectively diffused on the second incident surface 3c. For this reason, generation | occurrence | production of the "spotlight" in which the center part of the light guide 3 shines stronger than another part is suppressed more effectively.

  In the present embodiment, two V-shaped planes of the second incident surface 3c of the light guide 3 are connected by the arc-shaped concave curved surface 3d (see FIGS. 3 and 4), but as shown in FIG. The two planes forming the V shape of the second incident surface 3c may be connected by a horizontal flat surface 3F. In the present embodiment, the side cross-sectional shape of the second incident surface 3c may be a shape having no irregularities in addition to a circular convex (R shape). Furthermore, it is possible to avoid the intersection between the parting line and the center of the optical axis by decentering the top of the arc-shaped convex shape.

DESCRIPTION OF SYMBOLS 1,1 'Decorative lighting device 2 LED light source 3 Light guide 3A Light guide vertical part 3B Light guide horizontal part 3a Light guide first incident surface 3b Light guide first reflection surface 3c Light guide 3d 2nd incident surface 3d Arc concave surface of light guide 3e Second reflection surface of light guide 3f Flat surface of light guide 4 Through-hole of light guide L1-L3 Light X Optical axis of LED light source

Claims (5)

An LED light source, a light guide including an incident surface facing the LED light source, a first reflecting surface disposed on the optical axis of the LED light source, and second reflecting surfaces disposed on both sides of the optical axis. In the decorative lighting device configured,
2. A decorative illumination device according to claim 1, wherein the light guide is provided with a second incident surface on which the first reflecting surface advances straight in parallel with the optical axis of the LED light source and makes incident light enter again.   A through-hole having a fan-like shape is formed in the light guide, and two planes forming a V shape of the through-hole are defined as the first reflecting surface, and an arc-shaped outer peripheral surface of the through-hole is defined as the second incident surface. The decorative lighting device according to claim 1, wherein   3. The decorative illumination device according to claim 2, wherein the two flat surfaces forming the V shape of the second incident surface are connected by an arc concave curved surface or a flat surface.   The decorative illumination device according to any one of claims 1 to 3, wherein a side cross-sectional shape of the second incident surface is an arc convex curved surface. The decorative illumination device according to any one of claims 1 to 4, wherein the second incident surface has a knurled or prism shape.

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