JP2016054081A - Transparent material and lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make shade along a groove less noticeable.SOLUTION: A transparent material 5 comprises: a body unit 51 provided to extend from one end to another end and guiding light; an entrance plane 52 formed in one end of the body unit 51 and taking light in the body unit; an emission plane 54 formed in one end of the body unit 51 and extending in a direction crossed for the entrance plane; a light control plane 53 formed in the surface of backside of the body unit 51 to the emission plane 54 and reflecting the light taken in the body unit 51 for the emission plane 54; and a groove 55 formed to sink to the emission surface 54 and extending to a direction from one end of the body unit 51 to another end. The depth of the groove 55 decrease gradually with leaving from one end of the body unit 51 to another end side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light guide and a lamp.

  2. Description of the Related Art Conventionally, various lamps for vehicles, for example, are known that cause a light guide to emit light by light from a light source. As the light guide, a light guide rod formed in a long rod shape (for example, see Patent Documents 1 and 2) and a light guide plate formed in a plate shape (for example, see Patent Document 3) are widely used. Yes.

  Such a light guide generally has a rear surface on which a lens cut for reflecting internal light is formed, and the light incident from the end surface is guided by the rear lens cut and emitted from the front surface. By doing so, the front surface is configured to emit light.

JP 2010-272469 A JP 2013-179092 A JP 2013-168268 A

By the way, although it is not a well-known technique, by forming a bottomed groove along the longitudinal direction of the light guide rod as described in Patent Documents 1 and 2, the portions on both sides of the groove are narrowed. In addition, there is a technique for improving the efficiency of light emitted from the emission surface. However, since it is difficult for light to be emitted from the inner surface of the groove, a dark portion along the groove appears to be formed.
Therefore, the problem to be solved by the present invention is to make the dark part along the groove inconspicuous.

  In order to solve the above-described problems, the invention according to claim 1 is provided to extend from one end to the other end, and is formed at the one end of the main body portion and the main body portion that guides the light. An incident surface to be taken into a portion, an exit surface formed on a surface of the main body portion between the one end and the other end of the main body portion and extending in a direction intersecting the incident surface, and opposite to the exit surface A light control surface that is formed on a surface of the main body portion on the side and reflects light taken into the main body portion by the incident surface toward the emission surface, and is formed to be recessed in the emission surface. A groove extending in a direction from the one end to the other end, and the depth of the groove gradually decreases as the distance from the one end to the other end of the main body portion decreases. is there.

  The invention according to claim 2 is the light guide according to claim 1, wherein the groove is open on a surface of the one end of the main body.

  The invention according to claim 3 is characterized in that an end of the groove which is the other end side of the main body part is separated from the other end of the main body part to the one end side. The light guide.

  According to a fourth aspect of the present invention, there is provided the light source according to any one of the first to third aspects, and a first light source disposed on both sides of the groove so as to face the one end surface of the main body. And a second light source.

  According to the present invention, the brightness of the exit surface at the part on both sides of the groove is higher than the brightness of the inner surface of the groove, so that the band-like bright part along the part on both sides of the groove is between the band-like dark part along the groove. Looks like there is. However, since the brightness of the upper and lower bright portions near the entrance surface of the belt-like dark portion along the groove is sufficiently bright, the dark portions near the entrance surface are not easily noticeable. On the other hand, the brightness of the band-shaped dark part along the groove is gradually reduced as the depth of the groove is far from the incident surface, although the brightness of the part far from the incident surface is low among the band-shaped bright parts along the both sides of the groove. Gradually increases to the left. For this reason, the dark part of the part far from the incident surface is not noticeable.

It is a front view of a lamp. It is sectional drawing of the surface along the II-II line | wire of FIG. It is sectional drawing of the surface along the III-III line of FIG. It is sectional drawing of the surface along the IV-IV line | wire of FIG. It is sectional drawing of the surface along the VV line of FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention. Therefore, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

  The lamp 1 will be described with reference to FIGS. 1 is a front view of the lamp 1, FIG. 2 is a cross-sectional view showing a surface along the line II-II shown in FIG. 1 in the direction of the arrow, and FIG. 3 is a line III-III shown in FIG. 4 is a cross-sectional view showing the surface along the arrow direction, FIG. 4 is a cross-sectional view showing the surface along the line IV-IV shown in FIG. 1, and FIG. It is sectional drawing which showed the surface along the VV line shown to the arrow direction. In the following description, the direction illuminated by the lamp 1 is “front”, and “left” and “right” refer to the left and right when viewed from the rear of the lamp 1 toward the front. Further, “up and down direction” does not necessarily mean the vertical direction, and “downward direction” does not necessarily mean the direction in which gravity works.

  This lamp 1 is used as a vehicular lamp. Specifically, the lamp 1 is a vehicle signal lamp (for example, a tail lamp, a brake lamp, a direction indicator lamp, and a reverse lamp). The use of the lamp 1 may be other than for vehicles (for example, a general lighting tool, an emergency light, a home lighting tool, a business lighting tool, and a decorative lamp).

As shown in FIGS. 1 and 2, the lamp 1 includes a housing 2, an outer lens 3, an inner lens 6, a reflector 7, a plurality of light source pairs 4,... And a plurality of light guides 5,.
The front surface of the housing 2 is opened, the front opening of the housing 2 is closed by the outer lens 3, and the outer lens 3 is fixed to the housing 2. Thus, the lamp chamber 20 surrounded by the housing 2 and the outer lens 3 is formed inside the housing 2 and the outer lens 3. The outer lens 3 is a transparent cover that allows light to pass through.

  The reflector 7 is accommodated in the lamp chamber 20 and is fixed to the housing 2 or the outer lens 3. A metallic gloss film is formed on the front surface of the reflector 7. The front surface of the reflector 7 is formed in a step shape when viewed from the side. In other words, a plurality of standing surfaces extending in the left-right direction and extending forward and a plurality of step surfaces extending in the left-right direction and facing upward or obliquely forward alternate from top to bottom obliquely forward. Is arranged.

  The inner lens 6 is accommodated in the lamp chamber 20 and is disposed in front of the reflector 7. The inner lens 6 is fixed to the housing 2, the outer lens 3 or the reflector 7. A lens cut is formed on the front surface, the rear surface, or both of the inner lens 6, and light transmitted through the inner lens 6 is diffused by the lens cut.

  A pair of light sources 4 is accommodated in the lamp chamber 20. Each light source pair 4 includes a light source 41 and a light source 42. In any light source pair 4, the light source 41 is disposed on the light source 42. The light source pairs 4,... Are arranged vertically on the right side in the lamp chamber 20, and the light sources 41,.

  The light sources 41,... And the light sources 42,... Are semiconductor light emitting elements (for example, light emitting diodes (LEDs), organic light emitting diodes (OLEDs)). .. Are prepared for each of the light source pairs 4..., And the light source 41 and the light source 42 of each light source pair 4 are surface-mounted on a common substrate 43. The light sources 41,... And the light sources 42,... May be surface-mounted on a single substrate (integrated with the substrates 43,...).

  The light sources 41,... And the light sources 42,... Are directed to the left side, the light sources 41,. The optical axis extends to the left. The optical axis of the light source 41 refers to a virtual line extending from the light source 41 in the direction of the maximum luminous intensity in the spatial luminous intensity distribution (light distribution) of the light emitted by the light source 41. The same applies to the optical axis of the light source 42. Instead of the semiconductor light emitting element, a light bulb or a discharge lamp may be used for the light sources 41,.

  The light guides 5,... Extend from the left to the left of the light source pairs 4,. These light guides 5,... Are arranged vertically with an interval between them. The light guides 5,... Are respectively disposed in front of the plurality of standing surfaces of the reflector 7 and are disposed on the plurality of step surfaces.

Hereinafter, with reference to FIGS. 1 to 5, the uppermost light guide 5 will be described in detail, but the other light guides 5,... Have the same configuration as the upper light guide 5. is there.
The light guide 5 has a transparent main body 51 having a higher refractive index than air. The main body 51 extends in the left-right direction and is generally shaped like a strip.

  The right end surface of the main body 51 is a planar incident surface 52, the incident surface 52 faces the light sources 41 and 42, and the optical axes of the light sources 41 and 42 intersect the incident surface 52. Light emitted by the light sources 41 and 42 enters the incident surface 52 and is taken into the main body 51.

  The main body 51 is a medium for propagating light, and light taken into the main body 51 from the incident surface 52 is guided toward the left end surface by the main body 51.

  Of the surface of the main body 51 between the right end and the left end of the main body 51, the rear surface 53 of the main body 51 is the light control surface, and the front surface of the main body 51 is the emission surface 54. Specifically, a plurality of lens cuts are formed on the rear surface 53 of the main body 51, and the light propagating inside the main body 51 is totally reflected forward by the lens cut on the rear surface 53, thereby reflecting the reflected light. Enters the emission surface 54 at a angle less than the critical angle and exits forward of the main body 51. These lens cuts are elongated in the vertical direction, and are arranged in the horizontal direction over substantially the entire surface of the rear surface 53 of the main body 51 except for the upper and lower ends.

  A groove 55 is formed in a recessed state on the front surface (outgoing surface 54) of the main body 51, and the groove 55 extends in the left-right direction along the center line of the main body 51. The groove 55 reaches the right end of the main body 51, and the right end of the groove 55 is open on the right end surface of the main body 51. The groove 55 does not reach the left end of the main body 51, and the left end of the groove 55 is farther to the right than the left end of the main body 51.

  The light source 41 faces the right end surface (incident surface 52) of the main body 51 at a position above the groove 55, and the optical axis of the light source 41 intersects the right end surface of the main body 51 at a position above the groove 55. The light source 42 faces the right end surface of the main body 51 at a position below the groove 55, and the optical axis of the light source 42 intersects the right end surface of the main body 51 at a position below the groove 55.

  Of the front surface of the main body 51, a surface 56 above the groove 55 continues to the upper side of the bottom surface 55 a of the groove 55, and a lower surface 57 of the front surface of the main body 51 than the groove 55 is the bottom surface 55 a of the groove 55. Followed by The bottom surface 55a of the groove 55 is formed into a cylindrical concave surface type, the surface 56 above the groove 55 is formed into a cylindrical convex surface type, and the surface 57 below the groove 55 is also formed into a cylindrical convex surface type. Therefore, a part 58 and a part 59 below the groove 55 in the main body 51 are provided in a bowl shape (semi-cylindrical type) and extend in the left-right direction along the groove 55.

  The depth of the groove 55 gradually decreases as it moves away from the incident surface 52 to the left side. Therefore, the thickness of the part 60 in the main body 51 from the bottom surface 55a of the groove 55 to the rear surface 53 gradually increases as the distance from the incident surface 52 increases to the left. At the left end of the groove 55, the surface of the portion 60, the top surface of the upper portion 58, and the top surface of the lower portion 59 are aligned and are flush with each other. A portion 61 on the left side of the left end of the groove 55 in the main body 51 extends in the left-right direction and is generally shaped like a strip.

  The light emitted from the light source 41 is guided to the left mainly by the upper part 58 of the main body 51, and the light emitted by the light source 42 is guided to the left mainly by the lower part 59 of the main body 51. . Of course, the light emitted by the light sources 41 and 42 is also guided to the left by the central portion 60 of the main body 51.

  The brightness of the exit surfaces 56 and 57 of the upper and lower parts 58 and 59 of the main body 51 is higher than the brightness of the inner surface of the groove 55, and when viewed from the front, the band-like bright parts along the upper and lower parts 58 and 59 It appears to be between the strips of darkness along 55. The band-like dark part is not noticeable as follows. That is, since the brightness of the upper and lower bright portions near the light sources 41 and 42 in the belt-like dark portions along the groove 55 is sufficiently bright, the dark portions near the light sources 41 and 42 are hardly noticeable. On the other hand, although the brightness of the part far from the light sources 41 and 42 is low among the band-like bright parts along the parts 58 and 59, the depth of the groove 55 gradually decreases as the distance from the light sources 41 and 42 increases. The brightness of the band-like dark part gradually increases toward the left. Therefore, the dark part of the part far from the light sources 41 and 42 is hardly noticeable.

  Since the groove 55 is formed on the emission surface 54 of the main body 51, light is guided mainly inside the upper and lower portions 58 and 59 of the main body 51, and the light is efficient because these portions 58 and 59 are thin. Guided well, light is efficiently emitted from the emission surface 54 of the main body 51.

5 Light Guide 51 Main Body 52 Incident Surface 53 Light Control Surface 54 Output Surface 55 Groove

Claims (4)

A main body provided to extend from one end to the other end for guiding light;
An incident surface that is formed at the one end of the main body and takes light into the main body;
An exit surface formed on the surface of the body portion between the one end and the other end of the body portion, and extending in a direction intersecting the entrance surface;
A light control surface that is formed on the surface of the main body on the opposite side of the light exit surface and reflects light taken into the main body by the light incident surface toward the light exit surface;
A groove extending in the direction from the one end of the main body portion toward the other end, and formed to be recessed in the emission surface,
The light guide body, wherein the depth of the groove gradually decreases as the body part moves away from the one end to the other end side. The light guide according to claim 1, wherein the groove is open on a surface of the one end of the main body. 3. The light guide according to claim 1, wherein an end of the groove serving as the other end side of the main body is separated from the other end of the main body toward the one end. The light guide according to any one of claims 1 to 3,
A lamp, comprising: a first light source and a second light source disposed on both sides of the groove so as to face the one end surface of the main body.

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