CN110056833B - Lamp fitting - Google Patents

Lamp fitting Download PDF

Info

Publication number
CN110056833B
CN110056833B CN201910014138.XA CN201910014138A CN110056833B CN 110056833 B CN110056833 B CN 110056833B CN 201910014138 A CN201910014138 A CN 201910014138A CN 110056833 B CN110056833 B CN 110056833B
Authority
CN
China
Prior art keywords
light
incident
emitting element
region
light emitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910014138.XA
Other languages
Chinese (zh)
Other versions
CN110056833A (en
Inventor
本村宪一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Publication of CN110056833A publication Critical patent/CN110056833A/en
Application granted granted Critical
Publication of CN110056833B publication Critical patent/CN110056833B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F21S43/315—Optical layout thereof using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

The invention aims to provide a lamp which can inhibit local point-like light emission on an emergent surface and has excellent design. The tail lamp (1) is provided with a light-emitting element (23) and a lens (30), wherein the lens (30) is provided with an incident surface (31) for allowing the light emitted from the light-emitting element (23) to enter and an emitting surface (33) for allowing the light emitted from the incident surface (31) to exit. A first incident region (31A) for emitting incident light from an emission surface (33) without internally reflecting the incident light is provided in an incident surface (31) of a lens (30), and the first incident region (31A) is recessed in a tapered shape having a vertex (34) at one end on the side opposite to the light-emitting element (23).

Description

Lamp fitting
Cross Reference to Related Applications
This application claims priority to japanese patent application 2018-006725 entitled "lamp" filed on 2018, month 01 and 18, the entire contents of which are incorporated herein by reference.
Technical Field
The present invention relates to a lamp, and more particularly, to a lamp having excellent design.
Background
In some cases, the lamp is required to have improved design depending on the purpose. For example, a vehicle lamp disposed on the outer side of a vehicle is a part of the appearance of the vehicle, and thus the design tends to be emphasized. In addition, such a vehicle lamp can indicate the presence of the vehicle to a person outside the vehicle or display the state of the vehicle.
For example, patent document 1 listed below describes such a vehicle lamp that is disposed on the outer side of a vehicle. The vehicle lamp includes: a light emitting element which is disposed on an optical axis extending in a front-rear direction of the lamp and emits light toward the front; and a light-transmitting member arranged to cover the light-emitting element from the front side. The light-transmitting member for a vehicle lamp includes: a direct light control unit which is located on the optical axis and emits the incident light forward without internal reflection; and a reflected light control unit which is located around the direct light control unit and internally reflects the incident light to emit the light forward. In this lamp, when the light transmitting member is viewed from the front of the lamp, the direct light control section and the reflected light control section can be seen to emit light at a plurality of positions, and the appearance of the vehicle lamp at the time of lighting can be improved.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2005-203111
Disclosure of Invention
Problems to be solved by the invention
As the light emitting element in the vehicle lamp described in patent document 1, for example, a Light Emitting Diode (LED), a Laser Diode (LD), or the like can be used. In general, in the light emitted from the light emitting element as described above, the light near the optical axis of the light emitting element tends to have a higher intensity than the other light emitted from the light emitting element. In the vehicle lamp of patent document 1, as described above, the direct light control unit is positioned on the optical axis and emits the incident light forward without internally reflecting the incident light. Therefore, light near the optical axis of the light emitting element, which tends to have a higher light intensity, may enter the direct light control unit and be emitted from the direct light control unit without being diffused too much. Therefore, in the vehicle lamp described in patent document 1, there is a possibility that local point-like light emission on the emission surface of the direct light control unit is observed, and there is a demand for suppressing the local point-like light emission on the emission surface from the viewpoint of improving the appearance or the like.
Therefore, an object of the present invention is to provide a lamp that can suppress local point-like light emission on an emission surface and has excellent design properties.
Means for solving the problems
In order to achieve the above object, a lamp according to the present invention includes a light emitting element, and a lens having an incident surface on which light emitted from the light emitting element enters and an exit surface from which light entered from the incident surface exits, wherein the lens has a concave portion in a first incident region in the incident surface, the first incident region allowing the entered light to exit from the exit surface without being internally reflected, and the concave portion is recessed in a tapered shape having an end on a side opposite to the light emitting element side formed as a vertex.
In this lamp, as described above, the lens has the concave portion in the first incident region of the incident surface, which allows incident light to be emitted from the emission surface without being internally reflected, and the concave portion is formed in a tapered shape having a vertex at one end on the opposite side to the light emitting element side. That is, the concave portion is formed in a tapered shape by an incident surface inclined with respect to a straight line passing through the light emitting element and the apex. Therefore, light emitted from the light emitting element and incident on the apex of the concave portion and the region in the vicinity thereof can be refracted at the incident surface inclined with respect to the straight line, and can be dispersed radially with respect to the straight line. Therefore, for example, light having a high intensity among the light emitted from the light emitting element can be dispersed by allowing the light to enter the apex of the concave portion and the vicinity thereof. Therefore, local spot light emission on the emission surface of the lens can be suppressed, and the emission surface can be made to emit light more uniformly, and a lamp having excellent design can be set.
Preferably, the apex is located on an optical axis of the light emitting element.
As described above, in general, light emitted from a light emitting element such as a light emitting diode or a laser diode, the light near the optical axis of the light emitting element tends to have a higher intensity than the other light emitted from the light emitting element. Therefore, by locating the apex on the optical axis of the light emitting element, light in the vicinity of the optical axis of the light emitting element among the light emitted from the light emitting element can be made to enter the apex in the concave portion and the vicinity thereof, and light with high intensity can be dispersed. Therefore, local spot light emission on the emission surface of the lens can be suppressed, and the emission surface can be made to emit light more uniformly, and a lamp having excellent design can be set.
Preferably, the projection surface of the light-emitting element is curved in a convex shape toward the light-emitting element side with respect to a straight line connecting the apex and the outer edge between the apex and the outer edge of the concave portion in the incident surface.
With this configuration, it is possible to prevent light emitted from the light-emitting element and incident on the concave portion from being refracted and diffused in the concave portion, and to allow a large part of light incident on the concave portion to travel substantially parallel to each other in the lens, for example. Therefore, as compared with the case where the concave portion is not curved in this way, control of light emitted from the emission surface becomes easier, and it is possible to suppress the optical design of the lens from becoming complicated.
The shape of the concave portion in a cross section perpendicular to a straight line passing through the light emitting element and the vertex may be a polygon.
With this configuration, the concave portion is formed as a pyramid-shaped recess, and light incident on the concave portion is refracted in different directions on the plurality of surfaces forming the concave portion. Therefore, the region of the emission surface that emits light due to the light incident on the concave portion can be distributed at intervals in the circumferential direction around, for example, a straight line passing through the light emitting element and the apex. Therefore, the degree of freedom in the appearance of the lamp can be increased, and a lamp having excellent design can be set.
Preferably, the incident surface further includes a second incident region that internally reflects incident light at least once and emits the light from the emission surface, and when the incident surface is viewed from the front side of the light-emitting element, the second incident region is located around the first incident region, and at least a part of the second incident region is located closer to the light-emitting element than the first incident region in a direction parallel to a straight line passing through the light-emitting element and the vertex.
In this lamp, as described above, when the incident surface is viewed from the front side of the light emitting element, the second incident region is located around the first incident region, and at least a part of the second incident region is located closer to the light emitting element than the first incident region in a direction parallel to a straight line passing through the light emitting element and the vertex. Therefore, among the light emitted from the light emitting element, diffused light, which is light emitted so as to be apart from the optical axis of the light emitting element, can be made to enter the lens from the second entrance region. Therefore, the light emitted from the light emitting element can be efficiently emitted from the lens, as compared with the case where the second incident region is not provided. In addition, since the second incident region internally reflects the incident light at least once and emits the light from the emission surface, the light incident into the second incident region can be emitted in a desired direction from the lens. Therefore, the degree of freedom in the appearance of the lamp can be increased, and a lamp having excellent design can be set.
Preferably, when the incident surface has a second incident region, a portion between an edge of the second incident region on the first incident region side and an edge on the opposite side to the first incident region side is curved in a convex shape toward the light emitting element side with reference to a straight line connecting the edge of the first incident region side and the edge on the opposite side to the first incident region side.
With this configuration, it is possible to prevent light emitted from the light emitting element and incident on the second incident region from being refracted and diffused in the second incident region, and it is possible to cause most of the light incident on the second incident region to travel in the lens substantially parallel to each other, for example. Therefore, as compared with the case where the second incident region is not curved in this way, control of light emitted from the emission surface becomes easier, and it is possible to suppress the optical design of the lens from becoming complicated.
When the incident surface has a second incident region, the shape of the second incident region in a cross section perpendicular to a straight line passing through the light emitting element and the vertex may be a polygon.
With this configuration, the second incident region is formed by the plurality of surfaces connected in a ring shape, and the light incident on the second incident region is refracted in different directions on the plurality of surfaces forming the second incident region. Therefore, the region of the emission surface that emits light due to the light incident on the second incident region can be distributed at intervals in the circumferential direction around a straight line passing through the light emitting element and the vertex, or can be formed in a polygonal ring shape. Therefore, the degree of freedom in the appearance of the lamp can be increased, and a lamp having excellent design can be set.
A region of the emission surface including an intersection point intersecting a straight line passing through the light emitting element and the vertex may be a plane.
As described above, the light incident on the apex of the concave portion and the vicinity thereof can be dispersed radially with reference to a straight line passing through the light emitting element and the apex. Therefore, light emitted from the light emitting element and incident on the concave portion can be suppressed from being emitted from a region near an intersection point of the emission surface and a straight line passing through the light emitting element and the vertex, and local point-like light emission in the region can be suppressed even if the region is a plane. Therefore, the emission surface can be made to emit light more uniformly, and the degree of freedom in the appearance of the lamp can be improved, so that the lamp can be set to a lamp having excellent design.
Alternatively, a region of the emission surface including an intersection point with a straight line passing through the light emitting element and the vertex may be curved in a concave or convex shape toward the light emitting element side.
In the same way as in the case where the region of the emission surface including the intersection point with the straight line passing through the light emitting element and the vertex is a plane, even if the region is curved in a concave or convex shape toward the light emitting element side, local point-like light emission in the region can be suppressed. Therefore, the emission surface can be made to emit light more uniformly, and the degree of freedom in the appearance of the lamp can be improved, so that the lamp can be set to a lamp having excellent design.
Effects of the invention
As described above, according to the present invention, it is possible to suppress local point-like light emission on the emission surface, and it is possible to provide a lamp having excellent design properties.
Drawings
Fig. 1 is a diagram showing an example of a lamp according to an embodiment of the present invention.
Fig. 2 is an enlarged schematic view of the lamp unit shown in fig. 1.
Fig. 3 is a rear view schematically showing the lamp unit shown in fig. 1.
Fig. 4 is a front view schematically showing the lamp unit shown in fig. 1.
Fig. 5 is a diagram schematically showing a state of a light emitting surface of a lamp unit when the lamp is turned on.
Fig. 6 is a rear view schematically showing a lamp unit of a lamp according to a second embodiment of the present invention.
Fig. 7 is a front view schematically showing the lamp unit shown in fig. 6.
Fig. 8 is a cross-sectional view schematically showing the incident surface.
Fig. 9 is a diagram schematically showing a state of a light emitting surface of a lamp unit when the lamp is turned on.
Description of the reference numerals
1: tail lights (lamps);
10: a housing;
20: a lamp unit;
23: a light emitting element;
23A: an optical axis;
30: a lens;
31: an injection surface;
31A: a first injection region;
31B: a second injection region;
32: a reflective surface;
33: an emitting surface;
33A: a first emission region;
33B: a second emission region;
33C: a third emission region;
33D: a fourth emission region;
34: a vertex;
35: an outer edge of the first injection zone;
36: an outer edge of the second injection zone;
37: a point of intersection;
38: an outer edge of the first emission region;
39: an outer edge of the second emission region;
40: an inner edge of the third emission region;
41: an outer edge of the third emission region;
42: the inner edge of the second injection zone.
Detailed Description
Hereinafter, embodiments of a lamp according to the present invention will be described with reference to the drawings. The following embodiments are provided for the purpose of facilitating understanding of the present invention and are not intended to be construed as limiting the present invention. The present invention can be modified and improved according to the following embodiments without departing from the gist thereof.
(first embodiment)
Fig. 1 is a diagram showing an example of a lamp according to the present embodiment, and schematically shows a cross section of the lamp in a horizontal direction. In the present embodiment, as shown in fig. 1, the lamp is a tail lamp 1 of a vehicle, and includes a housing 10 and a plurality of lamp units 20 as main components.
The housing 10 of the present embodiment includes a lamp housing 11 and a front cover 12 as main components. The lamp housing 11 of the present embodiment is opened in front, and a translucent front cover 12 is fixed to the lamp housing 11 to close the opening. A space formed by the lamp housing 11 and the front cover 12 closing the front opening of the lamp housing 11 is a lamp chamber R in which a plurality of lamp units 20 are accommodated. The number of lamp units 20 included in the tail lamp 1 is not particularly limited. Fig. 1 shows an example in which five lamp units 20 are provided.
As shown in fig. 1, each of the plurality of lamp units 20 of the present embodiment includes a light source 21 and a lens 30 as main components, and is fixed to the housing 10 by a configuration not shown in the drawings. In the present embodiment, since the plurality of lamp units 20 have substantially the same configuration, only one lamp unit 20 will be described below.
The light source 21 of the present embodiment includes a light emitting element 23 mounted on a circuit board 22, and an optical axis 23A of the light emitting element 23 extends in a direction substantially perpendicular to the circuit board 22. The light emitting element 23 is supplied with power through the circuit board 22, and emits red light. As the light emitting element 23, for example, a semiconductor light emitting element such as a light emitting diode or a laser diode is used.
Fig. 2 is a schematic view showing the lamp unit 20 shown in fig. 1 in an enlarged manner, and is a sectional view through which the optical axis 23A of the light emitting element 23 passes. As shown in fig. 2, the lens 30 of the present embodiment has optical transparency and is disposed to face the light emitting element 23 of the light source 21. The lens 30 has an incident surface 31 and a reflecting surface 32 on the light emitting element 23 side, and an output surface 33 on the side opposite to the light emitting element 23 side.
The incident surface 31 is a surface into which light emitted from the light emitting element 23 enters the lens 30, and includes a first incident region 31A and a second incident region 31B. Fig. 3 is a rear view schematically showing the lamp unit 20 shown in fig. 1. In fig. 3, the circuit board 22 is not shown for easy understanding, and the light-emitting element 23 is indicated by a broken line. As shown in fig. 3, when the incident surface 31 is viewed from the front side of the light emitting element 23, the first incident region 31A of the present embodiment is formed in a substantially circular shape centered on the optical axis 23A of the light emitting element 23. As shown in fig. 2, the first incident region 31A is recessed in a substantially conical shape having an apex 34 at one end opposite to the light emitting element 23 side, and the apex 34 is located on the optical axis 23A of the light emitting element 23. The portion between the apex 34 and the outer edge 35 of the first incident region 31A is curved in a convex shape toward the light-emitting element 23 side with reference to a straight line connecting the apex 34 and the outer edge 35. Note that, instead of being curved in this manner, the first incident region 31A may be curved in a convex shape toward the side opposite to the light-emitting element 23 side.
However, as long as the first incident region 31A as a whole is tapered, the vertex 34 in the first incident region 31A includes a vertex rounded, for example, with a radius of curvature to the extent that the lens 30 is produced at the stage of manufacturing.
As shown in fig. 2 and 3, the second incident region 31B of the present embodiment extends from the entire periphery of the outer edge 35 of the first incident region 31A toward the light-emitting element 23, away from the optical axis 23A of the light-emitting element 23. That is, as shown in fig. 3, when the incident surface 31 is viewed from the front side of the light emitting element 23, the second incident region 31B is positioned around the first incident region 31A and has a substantially annular shape centered on the optical axis 23A of the light emitting element 23. As shown in fig. 2, the second incident region 31B is located closer to the light emitting element 23 than the first incident region 31A in a direction parallel to a straight line passing through the light emitting element 23 and the vertex 34 of the first incident region 31A, that is, the optical axis 23A of the light emitting element 23. Further, the outer edge 35 and the outer edge 36 of the second incident region 31B are curved in a convex shape toward the light emitting element 23 side with reference to a straight line connecting the outer edge 35 of the first incident region 31A, which is an edge on the first incident region 31A side, and the outer edge 36 of the second incident region 31B, which is an edge on the opposite side from the first incident region 31A side. In addition, the second incident region 31B may be curved in a convex shape toward the side opposite to the light emitting element 23 side, instead of being curved in this manner.
The reflecting surface 32 is provided so as to internally reflect the light L2 from the light emitting element 23 incident on the lens 30 from the second incident region 31B so as to transmit the light to the side opposite to the light emitting element 23 side. As shown in fig. 2 and 3, the reflecting surface 32 of the present embodiment extends from the entire periphery of the outer edge 36 of the second incident region 31B toward the side opposite to the light-emitting element 23 side, away from the optical axis 23A of the light-emitting element 23. As shown in fig. 3, when the incident surface 31 is viewed from the front side of the light emitting element 23, the reflecting surface 32 is positioned around the second incident region 31B and has a substantially annular shape centered on the optical axis 23A of the light emitting element 23.
The emission surface 33 is a surface from which light from the light-emitting element 23, which enters the lens 30 from the entrance surface 31, is emitted from the lens 30. The emission surface 33 of the present embodiment includes a first emission region 33A, a second emission region 33B, a third emission region 33C, and a fourth emission region 33D. Fig. 4 is a front view schematically showing the lamp unit 20 shown in fig. 1. In fig. 4, the circuit board 22 is not shown for easy understanding, and the light-emitting element 23 is shown by a broken line. As shown in fig. 4, when the emission surface 33 is viewed from the front side opposite to the light-emitting element 23 side, the first emission region 33A of the present embodiment is formed in a substantially circular shape centered on the optical axis 23A of the light-emitting element 23. Therefore, as shown in fig. 2, the first emission region 33A has an intersection point 37 intersecting a straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23. The first emission region 33A is a plane substantially perpendicular to the optical axis 23A.
The second emission region 33B is a surface from which the light L1 from the light-emitting element 23 that enters the lens 30 from the first entrance region 31A is emitted. As shown in fig. 2 and 4, the second emission region 33B of the present embodiment extends from the entire circumference of the outer edge 38 of the first emission region 33A toward the light-emitting element 23, away from the optical axis 23A of the light-emitting element 23. That is, as shown in fig. 4, when the emission surface 33 is viewed from the front side opposite to the light emitting element 23 side, the second emission region 33B is positioned around the first emission region 33A and has a substantially annular shape centered on the optical axis 23A of the light emitting element 23. Further, the outer edge 38 and the outer edge 39 of the second emission region 33B are curved in a convex shape toward the light emitting element 23 side with reference to a straight line connecting the outer edge 38 of the first emission region 33A, which is an edge on the first emission region 33A side, and the outer edge 39 of the second emission region 33B, which is an edge on the opposite side from the first emission region 33A side. As shown in fig. 4, the second emission region 33B is divided at substantially equal intervals in the circumferential direction around the optical axis 23A of the light emitting element 23, and the one end and the other end in the circumferential direction are curved in a convex shape toward the light emitting element 23 side with reference to a straight line connecting the one end and the other end in the circumferential direction in the divided region. Fig. 4 shows a mode in which the second emission region 33B is divided into eight parts. The second emission region 33B may be curved in a convex shape toward the side opposite to the light emitting element 23 side, instead of being curved in this manner. In addition, the second emission region 33B may be divided not in the circumferential direction around the optical axis 23A of the light emitting element 23 but in the radial direction around the optical axis 23A of the light emitting element 23 into a plurality of second emission regions 33B. The divided region may be formed of a plurality of surfaces instead of a single curved surface or a single flat surface, and may be formed of, for example, a fisheye lens.
The third emission region 33C is a surface from which the light L2 from the light-emitting element 23 that enters the lens 30 from the second entrance region 31B and is internally reflected by the reflection surface 32 is emitted. As shown in fig. 4, when the emission surface 33 is viewed from the front side opposite to the light emitting element 23 side, the third emission region 33C of the present embodiment is positioned around the second emission region 33B and has a substantially annular shape centered on the optical axis 23A of the light emitting element 23. As shown in fig. 2, the third emission region 33C is located on the opposite side of the outer edge 39 of the second emission region from the light-emitting element 23 side in the direction parallel to the optical axis 23A of the light-emitting element 23. The third emission region 33C is curved in a convex shape toward the side opposite to the light emitting element 23 side with reference to a straight line connecting the inner edge 40 on the second emission region 33B side and the outer edge 41 on the side opposite to the second emission region 33B side between the inner edge 40 and the outer edge 41. As shown in fig. 4, the third emission region 33C is divided at substantially equal intervals in the circumferential direction around the optical axis 23A of the light emitting element 23, and the one end and the other end in the circumferential direction are curved in a convex shape toward the side opposite to the light emitting element 23 side with reference to a straight line connecting the one end and the other end in the circumferential direction in the divided region. Fig. 4 shows a mode in which the third emission region 33C is divided into eight parts corresponding to the second emission region 33B divided into eight parts. The third emission region 33C may be curved in a convex shape toward the light emitting element 23 side, instead of being curved in this manner. In addition, the third emission region 33C may be divided not in the circumferential direction around the optical axis 23A of the light emitting element 23 but in the radial direction around the optical axis 23A of the light emitting element 23. The divided region may be formed of a plurality of surfaces instead of a single curved surface or a single flat surface, and may be formed of, for example, a fisheye lens.
As shown in fig. 2 and 4, the fourth emission region 33D of the present embodiment is a surface connecting the second emission region 33B and the third emission region 33C. As shown in fig. 4, when the emission surface 33 is viewed from the front on the side opposite to the light-emitting element 23, the fourth emission region 33D is formed in a substantially annular shape so as not to overlap with the second emission region 33B and the third emission region 33C.
Next, the optical path of light emitted from the light emitting element 23 will be described.
As shown in fig. 2, most of light L1 having a spread angle equal to or smaller than a predetermined angle among light emitted from light emitting element 23 enters first entrance region 31A on entrance surface 31 of lens 30. The light L1 incident on the first incident region is refracted in the first incident region 31A and transmitted through the lens 30. As described above, the first incident region 31A of the present embodiment is recessed in a substantially conical shape having an apex 34 at one end opposite to the light emitting element 23 side, and the apex 34 is located on the optical axis 23A of the light emitting element 23. That is, the first incident region 31A is formed in a conical shape by the incident surface 31 inclined with respect to a straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23. Therefore, in a cross section passing through the optical axis 23A of the light emitting element 23, the light incident on one side of the first incident region 31A and the light incident on the other side are refracted in different directions from each other with the optical axis 23A as a reference. Further, the portion between the vertex 34 and the outer edge 35 of the first incident region 31A is curved in a convex shape toward the light-emitting element 23 side with respect to the straight line connecting the vertex 34 and the outer edge 35, and the light L1 incident on the first incident region 31A is suppressed from being refracted and diffused in the first incident region 31A. In the present embodiment, in a cross section passing through the optical axis 23A of the light emitting element 23, the first incident region 31A is set to be curved so that most of the light L1 is transmitted substantially parallel to each other within the lens 30. The light L1 transmitted through the lens 30 is refracted at the second emission region 33B and emitted from the second emission region 33B. As described above, the outer edge 38 and the outer edge 39 of the second emission region 33B in the present embodiment are curved in a convex shape toward the light emitting element 23 side with reference to the straight line connecting the outer edge 38 and the outer edge 39. Therefore, in a cross section passing through the optical axis 23A of the light emitting element 23, most of the light L1 entering from the second emission region 33B is refracted and diffused in the second emission region 33B.
Thus, the light L1 incident on the first incident region 31A is emitted from the second emission region 33B without being internally reflected. In other words, the first incident region 31A is a region of the incident surface 31 in which the incident light L1 is emitted from the emission surface 33 without being internally reflected. Further, emitting the incident light L1 from the emission surface 33 without internal reflection does not mean that all of the incident light L1 is emitted from the emission surface 33 without internal reflection. For example, a part of the light L1 incident on the first incident region 31A may be rayleigh scattered in the lens 30 or diffused by distortion of the first incident region 31A. Although such light is internally reflected by the incident surface 31, the reflection surface 32, the emission surface 33, and the like and is emitted from the emission surface 33, it is considered that the first incident region 31A is a region where the incident light L1 is emitted from the emission surface 33 without being internally reflected.
On the other hand, most of the light L2 having a spread angle equal to or greater than a predetermined angle out of the light emitted from the light-emitting element 23 enters the second entrance region 31B on the entrance surface 31 of the lens 30. The light L2 incident on the second incident region 31B is refracted at the second incident region 31B and transmitted through the lens 30. As described above, the outer edge 35 and the outer edge 36 of the second incident region 31B are curved in a convex shape toward the light-emitting element 23 side with respect to the straight line connecting the outer edge 35 and the outer edge 36, and the light L2 incident on the second incident region 31B is suppressed from being refracted and diffused in the second incident region 31B. In the present embodiment, the second incident region 31B is curved in a cross section passing through the optical axis 23A of the light emitting element 23 so that most of the light L2 is transmitted in the lens 30 substantially in parallel with each other. The light L2 transmitted through the lens 30 in this way is internally reflected by the reflection surface 32, further transmitted through the lens 30, refracted by the third emission region 33C, and emitted from the third emission region 33C. As described above, the inner edge 40 and the outer edge 41 of the third emission region 33C are curved in a convex shape toward the side opposite to the light emitting element 23 side with reference to the straight line connecting the inner edge 40 and the outer edge 41. Therefore, in a cross section passing through the optical axis 23A of the light emitting element 23, most of the light L2 emitted from the third emission region 33C is refracted and condensed in the third emission region 33C.
Thus, the light L2 incident on the second incident region 31B is internally reflected by the reflection surface 32 and is emitted from the third emission region 33C. In other words, the second incident region 31B is a region of the incident surface 31 that internally reflects the incident light L2 and emits the light from the emission surface 33. It is noted that internally reflecting the incident light L2 to be emitted from the emission surface 33 does not mean internally reflecting all of the incident light L2 to be emitted from the emission surface 33. For example, a part of the light L2 incident on the second incident region 31B may be rayleigh scattered in the lens 30 or diffused by distortion of the second incident region 31B. Although such light is emitted from the emission surface 33 without being internally reflected, the second incident region 31B is considered to be a region of the incident surface 31 in which the incident light L2 is internally reflected and emitted from the emission surface 33.
However, among the light incident on the incident surface 31, light diffused by deformation of the incident surface 31, light rayleigh scattered in the lens 30, and light internally reflected by the reflection surface 32 and the like may be emitted from the first emission region 33A and the third emission region 33C in the emission surface 33. However, the incident surface 31 and the output surface 33 are formed so that the amount of light is smaller than the amount of light output from the second output region 33B and the third output region 33C.
In this way, in the tail lamp 1 of the present embodiment, the red light emitted from the light emitting element 23 of each lamp unit 20 enters the entrance surface 31 of each lens 30 and exits from the exit surface 33. The light emitted from the emitting surface 33 is emitted through the front cover 12, and the tail lamp 1 is turned on red.
Fig. 5 is a diagram schematically showing a state of a light emitting surface of a lamp unit when a lamp is turned on. In fig. 5, the intensity of light in the region a1 and the region a2 shown by oblique lines is higher than that in the region A3 and the region a4 which are not shown by oblique lines. The region a1 is a region that emits light due to the light L1 incident on the first incident region 31A, and corresponds substantially to the first emission region 33A side in the second emission region 33B. The region a1 has a substantially annular shape centered on the optical axis 23A of the light-emitting element 23, which is a straight line passing through the light-emitting element 23 and the apex 34. The region a2 is a region that emits light due to the light L2 incident on the second incident region 31B, and substantially corresponds to the third emission region 33C. The region a2 has a substantially annular shape centered on the optical axis 23A of the light-emitting element 23, which is a straight line passing through the light-emitting element 23 and the apex 34, and the annular region surrounds the region a 1. In addition, the region A3 substantially corresponds to the fourth emission region 33D side and the fourth emission region 33D in the second emission region 33B, and is located between the region a1 and the region a 2. The region a4 generally corresponds to the first ejection region 33A. Therefore, the appearance of the tail lamp 1 having the plurality of lamp units 20 when turned on is an appearance in which a plurality of two annular light emitting regions having substantially the same center are arranged.
As described above, the tail lamp 1 of the present embodiment includes the light emitting element 23, and the lens 30 includes the incident surface 31 through which the light emitted from the light emitting element 23 enters, and the output surface 33 through which the light entering from the incident surface 31 exits. The lens 30 has a first incident region 31A in the incident surface 31, the first incident region 31A emits the incident light from the emission surface 33 without internally reflecting the incident light, and the first incident region 31A is recessed in a substantially conical shape having a vertex 34 at one end on the side opposite to the light emitting element 23 side.
In the present embodiment, as described above, the first incident region 31A is recessed in a substantially conical shape having a vertex 34 at one end on the side opposite to the light-emitting element 23 side. That is, the first incident region 31A is formed in a conical shape by the incident surface 31 inclined with respect to a straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23. Therefore, as shown in fig. 2, the light LA emitted from the light-emitting element 23 and incident on the apex 34 of the first incident region 31A and the region in the vicinity thereof can be refracted at the incident surface 31 inclined with respect to the optical axis 23A of the light-emitting element 23 in the first incident region 31A, and can be dispersed radially with respect to the optical axis 23A of the light-emitting element 23. Therefore, for example, by allowing light of high intensity out of the light emitted from the light emitting element 23 to enter the apex 34 and the vicinity thereof in the first incident region 31A, the light of high intensity can be dispersed. Therefore, local spot light emission on the emission surface 33 of the lens 30 can be suppressed, and the emission surface 33 can emit light more uniformly, thereby setting the tail lamp 1 with excellent design.
In addition, from the viewpoint of suppressing local point-like light emission on the emission surface 33, it is preferable that the emission surface 31 forming the first incidence region 31A recessed in a conical shape is a rotation surface with respect to a straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23. With such a configuration, the light LA incident on the apex 34 of the first incident region 31A and the region in the vicinity thereof can be dispersed radially substantially uniformly with respect to the optical axis 23A of the light emitting element 23. Therefore, local spot light emission on the emission surface 33 can be further suppressed.
In the present embodiment, the apex 34 is located on the optical axis 23A of the light emitting element 23. In general, light emitted from a light emitting element such as a light emitting diode or a laser diode in the vicinity of the optical axis of the light emitting element tends to have higher intensity than other light emitted from the light emitting element. Therefore, by locating the apex 34 on the optical axis 23A of the light emitting element 23, light in the vicinity of the optical axis 23A of the light emitting element 23 out of the light emitted from the light emitting element 23 can be made incident on the apex 34 and the vicinity thereof in the first incident region 31A, and light having high intensity can be dispersed. Therefore, local spot light emission on the emission surface 33 of the lens 30 can be suppressed, and the emission surface can be made to emit light more uniformly, thereby providing the tail lamp 1 with excellent design.
In the present embodiment, the portion between the vertex 34 and the outer edge 35 of the first incident region 31A is curved in a convex shape toward the light-emitting element 23 side with reference to a straight line connecting the vertex 34 and the outer edge 35. Therefore, the light L2 emitted from the light-emitting element 23 and incident on the first incident region 31A can be suppressed from being refracted and diffused in the first incident region 31A, and for example, most of the light L1 incident on the first incident region 31A can be transmitted substantially parallel to each other in the lens 30. Therefore, as compared with the case where the first incident region 31A is not curved in this way, control of the light emitted from the emission surface 33 becomes easier, and it is possible to suppress the optical design of the lens 30 from becoming complicated.
In the present embodiment, the second incident region 31B is further provided to internally reflect incident light and emit the light from the emission surface 33. When the incident surface 31 is viewed from the front side of the light emitting element 23, the second incident region 31B is located around the first incident region 31A. The second incident region 31B is located closer to the light emitting element 23 than the first incident region 31A in a direction parallel to a straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23. Therefore, among the light emitted from the light emitting element 23, diffused light, which is light emitted so as to be apart from the optical axis 23A of the light emitting element 23, can be made incident on the lens 30 from the second incident region 31B. Therefore, the light emitted from the light emitting element 23 can be efficiently emitted from the lens 30, as compared with the case where the second incident region 31B is not provided. Further, since the second incident region 31B internally reflects the incident light L2 and emits the light from the emission surface 33, the light L2 incident on the second incident region 31B can be emitted in a desired direction from the lens 30. Therefore, the degree of freedom of the appearance of the tail lamp 1 can be increased, and a lamp having excellent design can be set.
In the present embodiment, the first emission region 33A of the emission surface 33 including the intersection 37 with the straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23 is set as a plane. As described above, the light LA incident on the apex 34 and the vicinity thereof in the first incident region 31A can be dispersed radially with respect to the optical axis 23A of the light emitting element 23. Therefore, light L1 emitted from light-emitting element 23 and incident on first incident region 31A can be suppressed from being emitted from first emission region 33A of emission surface 33, that is, a region near intersection point 37 intersecting optical axis 23A of light-emitting element 23. Even if the first emission region 33A is a flat surface, local spot light emission in the first emission region 33A can be suppressed. Therefore, the emission surface 33 can be made to emit light more uniformly, and the degree of freedom in the appearance of the tail lamp 1 can be improved, so that the tail lamp 1 having excellent design can be set.
Further, the first emission region 33A of the emission surface 33 including the intersection 37 with the straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23 may be curved in a concave or convex shape toward the light emitting element 23 side. Even with such a configuration, it is possible to suppress local point-like light emission in the first emission region 33A, to make the emission surface 33 emit light more uniformly, and to improve the degree of freedom in appearance of the tail lamp 1, thereby setting the tail lamp 1 to have excellent design.
(second embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to fig. 6 to 9. The same or equivalent components as those in the first embodiment among the components of the lamp of the present embodiment are denoted by the same reference numerals and redundant description thereof is omitted unless otherwise specified.
Fig. 6 is a rear view schematically showing a lamp unit of a lamp according to a second embodiment of the present invention, fig. 7 is a front view schematically showing the lamp unit shown in fig. 6, and fig. 8 is a cross-sectional view schematically showing an incident surface. Specifically, (a) in fig. 8 is a view showing a cross section of the first incident region 31A perpendicular to the optical axis 23A, and (B) in fig. 8 is a view showing a cross section of the second incident region 31B perpendicular to the optical axis 23A. In fig. 6 and 7, the circuit board 22 is not shown for easy understanding, and the light-emitting element 23 is shown by a broken line.
As shown in fig. 6 and 8, the lamp unit 20 in the tail lamp 1 of the present embodiment is different from the lamp unit 20 of the first embodiment in that the first incident region 31A is recessed so that one end on the side opposite to the light emitting element 23 side is formed in a substantially pyramid shape having a vertex 34. The lamp unit 20 of the present embodiment is different from the lamp unit 20 of the first embodiment in that the shape of the second incident region 31B and the reflecting surface 32 is a polygonal ring shape when the incident surface 31 is viewed from the front side of the light emitting element 23. Further, as shown in fig. 7, the lamp unit 20 of the present embodiment is different from the lamp unit 20 of the first embodiment in that the first emission region 33A is formed in a substantially polygonal shape when the emission surface 33 is viewed from the front on the side opposite to the light emitting element 23 side. The lamp unit 20 of the present embodiment is different from the lamp unit 20 of the first embodiment in that the second emission region 33B, the third emission region 33C, and the fourth emission region 33D are not annular when the emission surface 33 is viewed from the front on the side opposite to the light-emitting element 23 side. In addition, since the cross section X-X in fig. 6, which is a cross section passing through the optical axis 23A of the light emitting element 23 of the lamp unit 20 of the present embodiment, is the same as that in fig. 2, the illustration thereof is omitted. The polygon includes a shape in which corners of the polygon are rounded and a shape in which sides of the polygon are curved.
As shown in fig. 6, when the incident surface 31 is viewed from the front of the light emitting element 23, the first incident region 31A of the present embodiment is substantially a quadrangle centered on the optical axis 23A of the light emitting element 23. The first incident region 31A is recessed in a substantially octagonal pyramid shape having a vertex 34 at one end on the side opposite to the light emitting element 23, and the vertex 34 is located on the optical axis 23A of the light emitting element 23. That is, the first incident region 31A is formed by eight surfaces connected in a ring shape, and the eight surfaces pass through the vertexes 34, respectively. Further, as shown in fig. 8 (a), the shape of the first incident region 31A in a cross section perpendicular to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34, is substantially octagonal. The apexes 34 and the outer edges 35 of the eight surfaces forming the first incident region 31A are each curved in a convex shape toward the light-emitting element 23 with reference to a straight line connecting the apexes 34 and the outer edges 35. As shown in fig. 8 (a), each of the eight surfaces is curved in a convex shape toward the optical axis 23A side in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. The eight surfaces may not be curved in this manner.
As shown in fig. 6, when the incident surface 31 is viewed from the front side of the light emitting element 23, the second incident region 31B of the present embodiment is positioned around the first incident region 31A and has a substantially quadrangular ring shape centered on the optical axis 23A of the light emitting element 23. The second incident region 31B is formed by four surfaces connected in a ring shape. Further, as shown in fig. 8 (B), the shape of the second incident region 31B in the cross section perpendicular to the optical axis 23A of the light emitting element 23 is substantially quadrangular. The inner edge 42 and the outer edge 36 forming the four surfaces of the second incident region 31B are each curved in a convex shape toward the light emitting element 23 side with reference to a straight line connecting the inner edge 42 as an edge on the first emission region 33A side and the outer edge 36 of the second emission region 33B as an edge on the opposite side to the first emission region 33A side. As shown in fig. 8 (B), each of the four surfaces is curved in a convex shape toward the optical axis 23A side in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. Further, the four surfaces may not be curved in this manner.
As shown in fig. 6, when the incident surface 31 is viewed from the front side of the light emitting element 23, the reflection surface 32 of the present embodiment is positioned around the second incident region 31B and has a substantially quadrangular ring shape centered on the optical axis 23A of the light emitting element 23. The reflecting surface 32 is formed of four surfaces connected in a ring shape, similarly to the second incident region 31B. The four surfaces forming the reflecting surface 32 correspond to the four surfaces forming the second incident region 31B, respectively.
As shown in fig. 6, in the present embodiment, the incident surface 31 further includes a connecting region 50. The connection region 50 is a surface connecting the first incident region 31A and the second incident region 31B, and is a surface not overlapping with the first incident region 31A and the second incident region 31B when the incident surface 31 is viewed from the front side of the light-emitting element 23.
As shown in fig. 7, when the emission surface 33 is viewed from the front side opposite to the light-emitting element 23 side, the first emission region 33A of the present embodiment is formed in a substantially octagonal shape centered on the optical axis 23A of the light-emitting element 23, and has an intersection point 37 intersecting the optical axis 23A of the light-emitting element 23. The first emission region 33A is a plane substantially perpendicular to the optical axis 23A.
As shown in fig. 7, when the emission surface 33 is viewed from the front on the side opposite to the light emitting element 23, eight second emission regions 33B of the present embodiment are provided around the first emission region 33A, and the eight second emission regions 33B are arranged at substantially equal intervals in the circumferential direction around the optical axis 23A of the light emitting element 23. The eight second injection regions 33B correspond to the eight surfaces forming the first injection region 31A, respectively. The eight second emission regions 33B are each curved in a convex shape toward the light-emitting element 23 side in a direction parallel to the optical axis 23A of the light-emitting element 23, and are curved in a convex shape toward the optical axis 23A side in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. The eight second emission regions 33B may not be curved in this manner.
As shown in fig. 7, in the present embodiment, the emission surface 33 further includes eight connection regions 51. The eight connection regions 51 extend from the outer edge 38 of the first emission region 33A at positions corresponding to the sides of the octagon, and are located between two adjacent second emission regions 33B in the circumferential direction around the optical axis 23A of the light emitting element 23. Further, the two adjacent second emission regions 33B are connected by the connection region 51.
As shown in fig. 7, when the emission surface 33 is viewed from the front on the side opposite to the light emitting element 23 side, the third emission region 33C of the present embodiment is located around the second emission region 33B, is formed in a substantially quadrilateral ring shape centered on the optical axis 23A of the light emitting element 23, and is formed by four surfaces connected in a ring shape. The four faces correspond to the four faces forming the reflecting face 32, respectively. The four surfaces are each curved in a convex shape toward the side opposite to the light-emitting element 23 side in the direction parallel to the optical axis 23A of the light-emitting element 23, and are curved in a convex shape toward the optical axis 23A side in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. Further, the four surfaces may not be curved in this manner.
As shown in fig. 7, the fourth emission region 33D of the present embodiment is connected to the outer edge 39 of the second emission region 33B, the inner edge 40 of the third emission region 33C on the side of the second emission region 33B, and the connection region 51 when the emission surface 33 is viewed from the front on the side opposite to the light-emitting element 23. The second emission region 33B and the third emission region 33C, and the third emission region 33C and the connection region 51 are connected to each other by the fourth emission region 33D.
In the lamp unit 20 of the present embodiment as described above, as in the lamp unit 20 of the first embodiment, most of the light L1 having a diffusion angle equal to or smaller than a predetermined angle among the light emitted from the light emitting elements 23 enters the first entrance region 31A in the entrance surface 31 of the lens 30. As described above, the first incident region 31A is recessed in a substantially octagonal pyramid shape having a vertex 34 at one end on the side opposite to the light emitting element 23, and the vertex 34 is located on the optical axis 23A of the light emitting element 23. Therefore, the light incident on each of the eight surfaces forming the first incident region 31A is refracted in different directions at the respective surfaces. As described above, the apex 34 and the outer edge 35 of each of the eight surfaces are curved in a convex shape toward the light-emitting element 23 with respect to a straight line connecting the apex 34 and the outer edge 35, and are curved in a convex shape toward the optical axis 23A in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. Therefore, the light L1 incident on each surface is suppressed from being refracted and diffused on each surface. In the present embodiment, the eight surfaces are curved so that most of the light L1 incident on each surface travels in the lens 30 substantially parallel to each other.
In this way, the light L1 incident on each of the eight surfaces forming the first incident region 31A travels through the lens 30 toward the corresponding second emission region 33B, and is emitted from the second emission region 33B. As described above, each of the eight second emission regions 33B is curved in a convex shape toward the light-emitting element 23 side in the direction parallel to the optical axis 23A of the light-emitting element 23, and is curved in a convex shape toward the optical axis 23A side in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. Therefore, in a cross section passing through the optical axis 23A of the light emitting element 23, most of the light L1 entering from each of the second emission regions 33B is refracted and diffused in the second emission region 33B. Thus, the light L1 incident on the first incident region 31A is emitted from the second emission region 33B without being internally reflected, and the first incident region 31A is a region of the incident surface 31 in which the incident light L1 is emitted from the emission surface 33 without being internally reflected.
On the other hand, as in the lamp unit 20 of the first embodiment, most of the light L2 having a spread angle equal to or greater than a predetermined angle among the light emitted from the light emitting element 23 enters the second entrance region in the entrance surface 31 of the lens 30. As described above, since the second incident region 31B is formed of the four surfaces connected in a ring shape, the light incident on each of the four surfaces forming the second incident region 31B is refracted in different directions on the respective surfaces. The inner edge 42 and the outer edge 36 of the four surfaces are curved in a convex shape toward the light emitting element 23 with reference to a straight line connecting the inner edge 42 and the outer edge 36, and are curved in a convex shape toward the optical axis 23A on a cross section perpendicular to the optical axis 23A of the light emitting element 23. Therefore, the light L2 incident on each surface is suppressed from being refracted and diffused on each surface. In the present embodiment, the four surfaces are curved so that most of the light L2 incident on each surface travels in the lens 30 substantially parallel to each other.
Thus, the light L2 incident on each of the four surfaces forming the second incident region 31B is transmitted through the lens 30 toward the four surfaces forming the reflection surfaces 32 corresponding to the respective surfaces, and is internally reflected by each of the four surfaces forming the reflection surfaces 32. The light L2 internally reflected by each of the four surfaces forming the reflection surface 32 is further transmitted through the lens 30, and is emitted from the four surfaces forming the third emission region 33C corresponding to the four surfaces. As described above, the four surfaces forming the third emission region 33C are each curved in a convex shape toward the side opposite to the light-emitting element 23 side in the direction parallel to the optical axis 23A of the light-emitting element 23, and are curved in a convex shape toward the optical axis 23A side in a cross section perpendicular to the optical axis 23A of the light-emitting element 23. Therefore, in the present embodiment, in a cross section passing through the optical axis 23A of the light emitting element 23, most of the light L2 emitted from the four surfaces forming the third emission region 33C is refracted at each surface and condensed. Thus, the light L2 incident on the second incident region 31B is internally reflected by the reflection surface 32 and is emitted from the third emission region 33C, and the second incident region 31B is a region of the incident surface 31 in which the incident light L2 is internally reflected and is emitted from the emission surface 33.
In this way, the red light emitted from the light emitting element 23 of each lamp unit 20 in the tail light 1 is incident on the incident surface 31 of each lens 30 and is emitted from the emitting surface 33. The light emitted from the emitting surface 33 is emitted through the front cover 12, and the tail lamp 1 is turned on red.
Fig. 9 is a diagram schematically showing a state of a light emitting surface of a lamp unit when the lamp is turned on. In fig. 9, the intensity of light of the regions a1 and a2 shown with oblique lines is higher than that of the region A3 not shown with oblique lines. The region a1 is a region that emits light due to the light L1 incident on the first incident region 31A, and is distributed at intervals in the circumferential direction around the optical axis 23A of the light-emitting element 23, corresponding to the first emission region 33A side of the eight second emission regions 33B. The region a2 is a region that emits light due to the light L2 incident on the second incident region 31B, and substantially corresponds to the third emission region 33C. The region a2 is shaped like a substantially quadrilateral ring centered on the optical axis 23A of the light-emitting element 23, and the ring-shaped region surrounds the eight regions a 1. The region a3 substantially corresponds to the fourth emission region 33D side, the eight connection regions 51, and the fourth emission region 33D of the first emission region 33A and the second emission region 33B. Therefore, the appearance of the tail lamp 1 having the plurality of lamp units 20 when turned on is an appearance in which a plurality of light-emitting regions in the shape of a quadrilateral ring and other light-emitting regions scattered inside the light-emitting regions are arranged.
In this way, in the present embodiment, the first incident region 31A is formed by eight surfaces connected in a ring shape, and the eight surfaces pass through the vertexes 34, respectively. The shape of the first incident region 31A in a cross section perpendicular to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34, is substantially octagonal. Therefore, the first incident region 31A is formed as a depression in an octagon shape. Therefore, the light LA emitted from the light emitting element 23 and incident on the apex 34 of the first incident region 31A and the region in the vicinity thereof can be refracted at the eight surfaces forming the first incident region 31A, and dispersed radially with respect to the optical axis 23A of the light emitting element 23. Therefore, as in the case of the tail lamp 1 according to the first embodiment, for example, light having a high intensity among the light emitted from the light emitting element 23 can be dispersed by causing the light to enter the apex 34 and the vicinity thereof in the first incident region 31A. Therefore, local spot light emission on the emission surface 33 of the lens 30 can be suppressed, and the emission surface 33 can emit light more uniformly, thereby setting the tail lamp 1 with excellent design.
Further, in the emission surface 33, a region that emits light due to the light L1 incident on the first incident region 31A can be dispersed at intervals in the circumferential direction around, for example, the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34. Therefore, the degree of freedom of the appearance of the tail lamp 1 at the time of lighting can be improved, and a lamp having excellent design can be set.
In the present embodiment, the apex 34 is located on the optical axis 23A of the light emitting element 23. Therefore, as in the case of the tail lamp 1 according to the first embodiment, light having a high normal intensity in the vicinity of the optical axis 23A of the light emitting element 23 can be dispersed among the light emitted from the light emitting element 23. Therefore, local spot light emission on the emission surface 33 of the lens 30 can be suppressed, and the emission surface can be made to emit light more uniformly, thereby providing the tail lamp 1 with excellent design.
In the present embodiment, the portion between the vertex 34 and the outer edge 35 of the first incident region 31A is curved in a convex shape toward the light-emitting element 23 with reference to a straight line connecting the vertex 34 and the outer edge 35. Therefore, the light L2 emitted from the light-emitting element 23 and incident on the first incident region 31A can be suppressed from being refracted and diffused in the first incident region 31A, and for example, most of the light L1 incident on the first incident region 31A can be made to travel in the lens 30 so as to be substantially parallel to each other. Therefore, as compared with the case where the first incident region 31A is not curved in this way, control of the light emitted from the emission surface 33 becomes easier, and it is possible to suppress the optical design of the lens 30 from becoming complicated.
In the present embodiment, similarly to the tail lamp 1 of the first embodiment, the second incident region 31B that internally reflects incident light and emits the light from the emission surface 33 is further provided. When the incident surface 31 is viewed from the front side of the light emitting element 23, the second incident region 31B is located around the first incident region 31A. The second incident region 31B is located closer to the light emitting element 23 than the first incident region 31A in a direction parallel to a straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23. Therefore, among the light emitted from the light emitting element 23, diffused light, which is light emitted so as to be apart from the optical axis 23A of the light emitting element 23, can be made to enter the lens 30 from the second entrance region 31B. Therefore, the light emitted from the light emitting element 23 can be efficiently emitted from the lens 30, as compared with the case where the second incident region 31B is not provided. Further, since the second incident region 31B internally reflects the incident light L2 and emits the light from the emission surface 33, the light L2 incident on the second incident region 31B can be emitted in a desired direction from the lens 30. Therefore, the degree of freedom of the appearance of the tail lamp 1 can be increased, and a lamp having excellent design can be set.
In the present embodiment, the second incident region 31B is formed by four surfaces connected in a ring shape, and the shape of the second incident region 31B in a cross section perpendicular to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34, is a quadrangle. Therefore, the region of the output surface 33 that emits light due to the light L2 incident on the second incident region 31B can be set to a quadrangular ring shape, for example. Therefore, the degree of freedom in the appearance of the lamp can be increased, and a lamp having excellent design can be set. Further, by adjusting the direction of the internal reflection of the light L2 by the reflection surface 32, the light-emitting regions can be distributed at intervals in the circumferential direction around the optical axis 23A.
In the present embodiment, as in the case of the tail lamp 1 of the first embodiment, the first emission region 33A of the emission surface 33 including the intersection 37 with the straight line passing through the light emitting element 23 and the vertex 34, that is, the optical axis 23A of the light emitting element 23 is a plane. As described above, the light LA incident on the apex 34 and the vicinity thereof in the first incident region 31A can be dispersed radially with respect to the optical axis 23A of the light emitting element 23. Therefore, the light L1 emitted from the light emitting element 23 and incident on the first incident region 31A can be suppressed from being emitted from the first emission region 33A of the emission surface 33, that is, the region near the intersection point 37 intersecting the optical axis 23A of the light emitting element 23. Even if the first emission region 33A is set to be flat, local spot light emission in the first emission region 33A can be suppressed. Therefore, the emission surface 33 can be made to emit light more uniformly, and the degree of freedom in the appearance of the tail lamp 1 can be improved, so that the tail lamp 1 having excellent design can be set. The first emission region 33A may be curved in a concave shape toward the light emitting element 23. Even with such a configuration, it is possible to suppress local point-like light emission in the first emission region 33A, to make the emission surface 33 emit light more uniformly, and to improve the degree of freedom in appearance of the tail lamp 1, thereby setting the tail lamp 1 to have excellent design.
The present invention has been described above by taking the embodiments as examples, but the present invention is not limited to the above embodiments.
For example, in the second embodiment, the first incident region 31A in which the recess is in the shape of an octagon and the shape of a cross section perpendicular to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34, is substantially octagonal has been described as an example. However, the shape of the cross section is not particularly limited as long as it is a polygon, and may be, for example, a pentagon. That is, the first incident region 31A may be recessed in a pentagonal pyramid shape. In addition, it is preferable that, in the case where the first incident region 31A is recessed in a pentagonal pyramid shape, five second incident regions 33B are provided so as to correspond to the five surfaces forming the first incident region 31A, respectively. In order to suppress local point-like light emission on the emission surface, it is preferable that the first incident region recessed in a pyramid shape is rotationally symmetric with respect to a straight line passing through the light-emitting element 23 and the vertex 34, that is, the optical axis 23A of the light-emitting element 23. That is, the shape of the first incident region 31A in a cross section perpendicular to the optical axis 23A is preferably rotationally symmetric with respect to the optical axis 23A. With such a configuration, the light LA incident on the apex 34 of the first incident region 31A and the region in the vicinity thereof can be dispersed radially substantially uniformly with respect to the optical axis 23A of the light emitting element 23. Therefore, local spot light emission on the emission surface 33 can be further suppressed.
In the second embodiment, the first incident region 31A having a substantially rectangular shape when the incident surface 31 is viewed from the front side of the light emitting element 23 is described as an example, but the shape is not particularly limited and may be, for example, a circular shape.
In the above-described embodiment, the first incident region 31A having a substantially conical or pyramidal shape in which the recess is formed to have the apex 34 at the end opposite to the light-emitting element 23 side has been described as an example. However, as long as the first incident region 31A has a concave portion recessed in a substantially tapered shape with an apex 34 formed at one end on the side opposite to the light-emitting element 23, the first incident region 31A may not be recessed in a tapered shape as a whole.
In the second embodiment, the second incident region 31B having a substantially rectangular shape in a cross section perpendicular to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34, is described as an example. However, the shape of the cross section is not particularly limited, and may be, for example, a pentagon.
In the second embodiment, the first incident region 31A may be recessed in a conical shape, as in the first embodiment. In addition, when the first injection region 31A is recessed in a conical shape, the second injection region 33B is preferably configured in the same manner as in the first embodiment. In the second embodiment, the second incident region 31B may have the same configuration as that of the first embodiment. That is, the second incident region 31B may be formed in a substantially circular shape in a cross section perpendicular to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the apex 34. In addition, when the second injection region 31B is configured in this way, the third injection region 33C is preferably configured in the same manner as in the first embodiment.
In the above-described embodiment, the second incident region 31B in which incident light is internally reflected once and is emitted from the emission surface 33 is described as an example. However, the second incident region 31B may be configured to emit the incident light from the emission surface 33 by at least one internal reflection, or may be configured to emit the light from the emission surface 33 by multiple internal reflections. The lens 30 may not have the second incident region 31B.
In the above embodiment, the apex 34 is located on the optical axis 23A of the light emitting element 23, but may not be located on the optical axis 23A. However, from the viewpoint of further suppressing the local point-like light emission on the emission surface 33 of the lens 30 as described above, it is preferable that the apex 34 be located on the optical axis 23A of the light-emitting element 23.
In the above-described embodiment, the second incident region 31B located closer to the light emitting element 23 than the first incident region 31A in the direction parallel to the optical axis 23A of the light emitting element 23, which is a straight line passing through the light emitting element 23 and the vertex 34 of the first incident region, has been described as an example. However, at least a part of the second incident region 31B may be located closer to the light emitting element 23 than the first incident region 31A in a direction parallel to a straight line passing through the light emitting element 23 and the vertex 34 of the first incident region 31A, that is, the optical axis 23A of the light emitting element 23.
In the above embodiment, the lenses 30 in the plurality of lamp units 20 are provided independently of each other. However, the lenses 30 may be formed integrally with each other. In the above embodiment, the circuit boards 22 in the plurality of lamp units 20 are provided independently of each other. However, the circuit boards 22 may be formed integrally with each other.
In the above embodiment, the tail lamp 1 includes the plurality of lamp units 20 having substantially the same configuration. However, the tail light 1 may include the lamp unit 20 having a different configuration, and for example, may include the lamp unit 20 according to the first embodiment and the lamp unit 20 according to the second embodiment.
In the above-described embodiment, the light-emitting element 23 that emits red light is described as an example. However, the color of light emitted from the light emitting element 23 is not particularly limited, and for example, the light emitting element 23 may emit white light. In the above case, for example, the front cover 12 has translucency and is colored red.
In the above embodiment, the tail lamp 1 of the vehicle is described as an example, but the lamp may be another lamp of the vehicle, for example, a brake lamp. Further, the lamp may be a lamp used for a building or the like. Even in such a case, the degree of freedom in changing the appearance can be improved as described above, and a lamp having excellent design can be set.
Industrial applicability
The present invention provides a lamp which can suppress local point-like light emission on an emission surface and has excellent design properties, and can be applied to the field of lighting and the like.

Claims (8)

1. A lamp is characterized in that the lamp is provided with a lamp body,
the lamp includes a light emitting element and a lens having an incident surface on which light emitted from the light emitting element is incident and an emitting surface from which light incident from the incident surface is emitted,
the lens has a concave portion in a first incident region of the incident surface, the first incident region emitting incident light from the emission surface without internal reflection, the concave portion being formed in a tapered shape having one end on the side opposite to the light emitting element side formed as a vertex,
the apex is located on an optical axis of the light emitting element,
light emitted from the light emitting element and incident on the apex of the first incident region and a region in the vicinity thereof is refracted at the incident surface inclined with respect to the optical axis of the light emitting element in the first incident region, and is dispersed radially with respect to the optical axis of the light emitting element, and light emitted from the light emitting element and incident on the first incident region is suppressed from being emitted from a region in the vicinity of an intersection point intersecting the optical axis of the light emitting element in the emission surface.
2. The luminaire of claim 1,
the concave portion of the incident surface is curved in a convex shape toward the light emitting element side with respect to a straight line connecting the apex and the outer edge.
3. Luminaire according to claim 1 or 2,
the shape of the concave portion in a cross section perpendicular to a straight line passing through the light emitting element and the vertex is set to be a polygon.
4. Luminaire according to claim 1 or 2,
the incident surface further has a second incident region for emitting the incident light from the emitting surface by at least one internal reflection,
when the incident surface is viewed from the light-emitting element side in front view, the second incident region is located around the first incident region, and at least a part of the second incident region is located closer to the light-emitting element than the first incident region in a direction parallel to a straight line passing through the light-emitting element and the vertex.
5. The luminaire of claim 4,
the edge of the second incident region on the first incident region side and the edge on the opposite side to the first incident region side are curved in a convex shape toward the light emitting element side with reference to a straight line connecting the edge of the first incident region side and the edge on the opposite side to the first incident region side.
6. The luminaire of claim 4,
the shape of the second incident region in a cross section perpendicular to a straight line passing through the light emitting element and the vertex is a polygon.
7. Luminaire according to claim 1 or 2,
a region of the emission surface including an intersection point intersecting a straight line passing through the light emitting element and the vertex is set as a plane.
8. Luminaire according to claim 1 or 2,
a region of the emission surface including an intersection point intersecting a straight line passing through the light emitting element and the vertex is curved in a concave or convex shape toward the light emitting element side.
CN201910014138.XA 2018-01-18 2019-01-08 Lamp fitting Active CN110056833B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018006725A JP2019125532A (en) 2018-01-18 2018-01-18 Lighting fixture
JP2018-006725 2018-01-18

Publications (2)

Publication Number Publication Date
CN110056833A CN110056833A (en) 2019-07-26
CN110056833B true CN110056833B (en) 2022-01-18

Family

ID=67315596

Family Applications (2)

Application Number Title Priority Date Filing Date
CN201920023736.9U Active CN209540772U (en) 2018-01-18 2019-01-08 Lamps and lanterns
CN201910014138.XA Active CN110056833B (en) 2018-01-18 2019-01-08 Lamp fitting

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201920023736.9U Active CN209540772U (en) 2018-01-18 2019-01-08 Lamps and lanterns

Country Status (2)

Country Link
JP (1) JP2019125532A (en)
CN (2) CN209540772U (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019125532A (en) * 2018-01-18 2019-07-25 株式会社小糸製作所 Lighting fixture
JP7458242B2 (en) * 2020-05-28 2024-03-29 株式会社小糸製作所 Vehicle lights
CN117212734A (en) * 2023-11-07 2023-12-12 常州星宇车灯股份有限公司 Car light structure of star river lighting effect

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2211087A2 (en) * 2009-01-27 2010-07-28 Koito Manufacturing Co., Ltd. Vehicle lamp
DE102009023916A1 (en) * 2009-06-04 2010-12-09 Hella Kgaa Hueck & Co. Light for vehicle, has external section formed such that light bundle is radiated for production of signal light functions acting sideways under total reflection at surfaces, where another bundle is radiated from lens section
JP2012028010A (en) * 2010-07-20 2012-02-09 Stanley Electric Co Ltd Lamp fitting for vehicle
EP2489550A2 (en) * 2011-02-17 2012-08-22 Koito Manufacturing Co., Ltd. Vehicle lamp
CN102695915A (en) * 2009-12-21 2012-09-26 马丁专业公司 Light collector with extended center lens
CN203784831U (en) * 2014-03-14 2014-08-20 安徽芯瑞达电子科技有限公司 Novel reflective lens
TWI489061B (en) * 2013-06-06 2015-06-21
CN204879962U (en) * 2015-08-24 2015-12-16 徐朝富 Be adapted to low -angle lens of COB light source
EP3168657A1 (en) * 2015-11-13 2017-05-17 Automotive Lighting Reutlingen GmbH Attachment lens and attachment lens assembly with multiple attachment lenses
CN209540772U (en) * 2018-01-18 2019-10-25 株式会社小糸制作所 Lamps and lanterns

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2211087A2 (en) * 2009-01-27 2010-07-28 Koito Manufacturing Co., Ltd. Vehicle lamp
DE102009023916A1 (en) * 2009-06-04 2010-12-09 Hella Kgaa Hueck & Co. Light for vehicle, has external section formed such that light bundle is radiated for production of signal light functions acting sideways under total reflection at surfaces, where another bundle is radiated from lens section
CN102695915A (en) * 2009-12-21 2012-09-26 马丁专业公司 Light collector with extended center lens
JP2012028010A (en) * 2010-07-20 2012-02-09 Stanley Electric Co Ltd Lamp fitting for vehicle
EP2489550A2 (en) * 2011-02-17 2012-08-22 Koito Manufacturing Co., Ltd. Vehicle lamp
TWI489061B (en) * 2013-06-06 2015-06-21
CN203784831U (en) * 2014-03-14 2014-08-20 安徽芯瑞达电子科技有限公司 Novel reflective lens
CN204879962U (en) * 2015-08-24 2015-12-16 徐朝富 Be adapted to low -angle lens of COB light source
EP3168657A1 (en) * 2015-11-13 2017-05-17 Automotive Lighting Reutlingen GmbH Attachment lens and attachment lens assembly with multiple attachment lenses
CN209540772U (en) * 2018-01-18 2019-10-25 株式会社小糸制作所 Lamps and lanterns

Also Published As

Publication number Publication date
CN209540772U (en) 2019-10-25
JP2019125532A (en) 2019-07-25
CN110056833A (en) 2019-07-26

Similar Documents

Publication Publication Date Title
JP5596418B2 (en) Vehicle lighting
US7270454B2 (en) Vehicular lamp
CN110056833B (en) Lamp fitting
US7524091B2 (en) Led bulb refractive relector
WO2013118448A1 (en) Beam-control member and illumination device
JP2004152764A (en) Display lamp equipped with optical device for collection and distribution of luminous flux annular reflector
JP2004039503A (en) Vehicular lamp
US20170267163A1 (en) Vehicle decorative lighting device and vehicle lamp
JP2017021963A (en) Vehicular lighting fixture
US6364514B1 (en) Vehicular indicator lamp
CN110397893B (en) Vehicle lamp
JP4173344B2 (en) Vehicle lighting
CA3061625C (en) Total internal reflection lens to lessen glare and maintain color mixing and beam control
ES2229194T3 (en) SIGNAL LIGHT THAT INCLUDES AN OPTICAL ELEMENT TO PERFORM AN AUTONOMOUS SIGNALING FUNCTION.
EP3577389B1 (en) A dielectric collimator with a rejecting center lens
WO2018076466A1 (en) Lampshade, lamp and aircraft
JP5515846B2 (en) Vehicle lighting
WO2023157944A1 (en) Vehicle lamp
JP7394315B2 (en) lighting equipment
JP2022177876A (en) Vehicle lighting appliance
JP6791774B2 (en) Lamp
JP2022002185A (en) Luminaire and vehicular lighting fixture
JP2022064039A (en) Vehicular lamp and lens body
JP2022152827A (en) Vehicular lighting fixture
JP2002075005A (en) Signal light

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant