CN113739099B - Lighting device - Google Patents
Lighting device Download PDFInfo
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- CN113739099B CN113739099B CN202110577381.XA CN202110577381A CN113739099B CN 113739099 B CN113739099 B CN 113739099B CN 202110577381 A CN202110577381 A CN 202110577381A CN 113739099 B CN113739099 B CN 113739099B
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- light
- light source
- width direction
- longitudinal
- longitudinal direction
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- 238000009792 diffusion process Methods 0.000 claims abstract description 79
- 239000000758 substrate Substances 0.000 claims description 9
- 238000005286 illumination Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- -1 polybutylene terephthalate Polymers 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
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- 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
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- 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
- F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
- F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
Abstract
The invention provides a lighting device capable of improving uniformity of a light emitting surface for emitting light by using a surface mounting type light source. The lighting device is provided with: a surface-mounted light source that emits light; and a light guide body extending in a predetermined direction for guiding light emitted from the light source. The light guide body has a longitudinal light diffusion portion arranged in a first width direction along a light emitting surface of the light guide body with respect to the light source, and diffuses light emitted from the light source in the first width direction in the longitudinal direction of the light guide body.
Description
Technical Field
The present invention relates to a lighting device.
Background
Conventionally, an illumination device that emits light in a planar or band shape is known (for example, patent document 1). The lighting device includes a light source and a light guide. The light source is a shell type LED lamp emitting light. The light guide extends in a predetermined direction, and guides light emitted from the light source. The light source is disposed so as to be inserted toward the longitudinal end of the light guide body toward the longitudinal side of the light guide body. After being introduced into the light guide, the light emitted from the light source is emitted from a surface (i.e., a light emitting surface) provided on one end surface in the width direction of the light guide.
Patent document 1: japanese patent laid-open No. 2007-185980
However, in the shell type LED lamp, a lead type electronic component is required, and thus the component unit price becomes high. Therefore, in order to suppress the unit price of the components to be low, a Surface Mount (SMD) LED lamp is considered. However, in the SMD type LED lamp, if the optical path length from the light source to the light emitting surface is short, the light cannot be sufficiently diffused, and uniformity of the planar or band-shaped light emitting surface is impaired.
Disclosure of Invention
The present invention has been made in view of the above, and an object of the present invention is to provide a lighting device capable of improving uniformity of a light emitting surface that emits light using a surface mount type light source.
An illumination device according to an embodiment of the present invention includes: a surface-mounted light source that emits light; and a light guide body extending in a predetermined direction and guiding light emitted from the light source, wherein the light guide body has a longitudinal light diffusion portion, and the longitudinal light diffusion portion is disposed along a first width direction of a light emitting surface of the light guide body with respect to the light source, and diffuses light emitted from the light source in the first width direction in a longitudinal direction of the light guide body.
According to this configuration, the light emitted from the surface-mounted light source in the first width direction is diffused in the longitudinal direction by the longitudinal direction light diffusion portion of the light guide, and the light can travel to the longitudinal direction end portion side of the light guide. Therefore, uniformity of a light emitting surface for emitting light using the surface mount type light source can be improved.
Drawings
Fig. 1 is a perspective view of an illumination device according to an embodiment of the present invention from the front upper side.
Fig. 2 is a perspective view of the lighting device according to the embodiment as viewed from the lower rear side.
Fig. 3 is a circuit diagram of a light source unit included in the lighting device according to the embodiment.
Fig. 4 is a six-sided view of the lighting device according to the embodiment, fig. 4 (a) is a front view, fig. 4 (B) is a top view, fig. 4 (C) is a left side view, fig. 4 (D) is a right side view, fig. 4 (E) is a rear view, and fig. 4 (F) is a bottom view.
Fig. 5 is a cross-sectional view of the lighting device according to the embodiment taken along V-V shown in fig. 4.
Fig. 6 is a cross-sectional view of the lighting device according to the embodiment taken along VI-VI shown in fig. 4.
Fig. 7 is a perspective view of a light guide provided in the lighting device according to the embodiment.
Fig. 8 is a six-sided view of a light guide body of the lighting device according to the embodiment, fig. 8 (a) is a front view, fig. 8 (B) is a top view, fig. 8 (C) is a left side view, fig. 8 (D) is a right side view, fig. 8 (E) is a rear view, and fig. 8 (F) is a bottom view.
Fig. 9 is a cross-sectional view of the light guide of the lighting device according to the embodiment taken along IX-IX in fig. 8 and a view schematically showing the diffusion of light in the width direction.
Fig. 10 is a view schematically showing the diffusion of light in the longitudinal direction in the light guide of the lighting device according to the embodiment.
Fig. 11 is a diagram showing a relationship between a longitudinal position and illuminance in a light guide of the lighting device according to the embodiment.
Fig. 12 is a diagram showing a relationship between a longitudinal position and brightness in a light guide of the lighting device according to the embodiment.
Fig. 13 is an enlarged view of a first essential part showing a relationship between a longitudinal position and brightness in a light guide of the lighting device according to the embodiment.
Fig. 14 is an enlarged view of a second essential part showing a relationship between a longitudinal position and brightness in the light guide of the lighting device according to the embodiment.
Reference numerals illustrate:
1 … lighting device; 10 … housing cover; 20 … light source units; 21 … light source; 25 … substrate; 30 … light guide; 30a … outer surface (surface); 30b … inner surface (back); 31 … light entrance face; 32 … slit portions; 32a … inclined surfaces; 33 … light reflecting surfaces; 34 … light-emitting direction light diffusion portions; 34a … groove; 35 … light emitting face; 36 … longitudinal light diffusion portions; 36a … first light diffusing part; 36b … second light diffusing parts; 36c … ribs; x … lengthwise; y … first width direction; z … second width direction.
Detailed Description
Hereinafter, a specific embodiment of the lighting device of the present invention will be described with reference to the drawings.
The lighting device 1 of the present embodiment is a device that emits light in a planar shape or a band shape. The lighting device 1 is mounted on, for example, an interior of a vehicle (specifically, an interior handle frame or the like), and emits light from the surface of the interior. The lighting device 1 is attached to, for example, the upper part of the lower surface side of the inner handle frame, and emits light from the lower surface side. In the lighting device 1 of the present embodiment, the light emitting surface is located on the lower surface.
As shown in fig. 1 and 2, the lighting device 1 includes a housing 10, a light source unit 20, and a light guide 30.
The housing cover 10 is a housing member covering the light source unit 20 and the light guide 30. The housing cover 10 has a protection function, a design function, a light pollution prevention function, a light reflection function, and the like. The protection function is a function of protecting the light source unit 20 and the light guide 30. The design function is a function that improves the design performance of the lighting device 1. The light pollution prevention function is a function of preventing light emitted from the light source unit 20 in a direction different from the light guide 30 side from leaking from a portion other than the light emitting surface. The light reflection function is a function of reflecting light emitted from the light source unit 20 in a direction different from the light guide 30 side toward the light guide 30 side.
The housing cover 10 is formed into a substantially rectangular tray shape with its edges standing. The housing cover 10 is formed in a shape and a material in consideration of light reflectivity/diffusivity and connection performance (for example, strength, dimensional stability, withstand voltage, and the like) with other members. The housing cover 10 is made of white resin. The material of the housing cover 10 is, for example, a resin material such as polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile Butadiene Styrene (ABS), or the like.
It is preferable to use PBT as the material of the housing cover 10 in order to increase the material strength and reduce the molding shrinkage. In order to improve the reflectivity and diffusivity of light, the material of the housing cover 10 preferably contains, for example, titanium oxide (TiO 2 ). The content of the titanium oxide is preferably about 15% to 20%, for example.
As shown in fig. 2, 4 and 5, the housing cover 10 has a first opening 11 and a second opening 12. The first opening 11 is an opening into which the light source unit 20 is inserted. In a state where the light source unit 20 is inserted into the first opening 11, the light source unit 20 and the housing cover 10 are positioned and locked with each other. The second opening 12 is an opening into which the light guide 30 is fitted. In a state where the light guide 30 is fitted in the second opening 12, the light guide 30 and the housing cover 10 are positioned and locked with each other.
The light source unit 20 is a unit that generates light. As shown in fig. 3, the light source unit 20 has a light source 21, a zener diode 22, a resistor 23, and a diode 24. The light source 21, the zener diode 22, the resistor 23, and the diode 24 constitute a lighting circuit for lighting the light source 21. The light source 21, the zener diode 22, the resistor 23, and the diode 24 are disposed on a substrate 25 (see fig. 5 and 6) housed in a case-type holder. The light source unit 20 is mounted and fixed to the housing case 10 by being inserted into the first opening 11 of the housing case 10 through its holder.
The light source 21 is a LED (LightEmittingDiode) lamp that emits light. Specifically, the light source 21 is a Surface Mount (SMD) type LED lamp in which LED elements are mounted on a substrate 25. The light source 21 includes a blue light emitting diode and a yellow phosphor (YAG), and emits white light. The light source 21 emits light in all directions. The zener diode 22 and the diode 24 are circuit components that protect the lighted light source 21.
The light guide 30 is a lens member that converts light emitted from the light source 21 into planar or band-shaped light (see fig. 7 and 8). The light guide 30 guides the light emitted from the light source 21. The material of the light guide 30 is, for example, a resin material such as PC (polycarbonate fiber) or PMMA (acrylic), and a material to which a diffusing agent is added.
The light guide 30 is formed in a plate shape and extends in a predetermined direction. The light guide 30 is cut by a lens to collect, totally reflect, guide, and diffuse the light emitted from the light source 21, and radiate the light in a planar or band shape. As shown in fig. 9 and 10, the light guide 30 includes a light incident surface 31, a slit portion 32, a light reflecting surface 33, a light emitting direction light diffusing portion 34, a light emitting surface 35, and a longitudinal direction light diffusing portion 36. Hereinafter, the predetermined direction in which the light guide 30 extends is referred to as a longitudinal direction X, a direction along the light emitting surface 35 in a width direction orthogonal to the longitudinal direction X is referred to as a first width direction Y, and a direction orthogonal to the light emitting surface 35 in a width direction orthogonal to the longitudinal direction X (i.e., a direction orthogonal to both the longitudinal direction X and the first width direction Y) is referred to as a second width direction Z.
The light incident surface 31 is a surface into which light emitted from the light source 21 in the second width direction Z is incident. The light source 21 is disposed inside the light guide 30, specifically, opposite to the light guide 30 in the second width direction Z and in the vicinity of the approximate center of the light guide 30 in the longitudinal direction X. The light incident surface 31 and the light source 21 are arranged to be separated by a predetermined distance.
The light incident surface 31 is a surface formed in a shape of an R-surface (circular arc surface) so as to protrude toward the light source 21 side (i.e., the second width direction Z), and is formed in a tunnel shape so that the cross-section R-surface extends in the longitudinal direction X. The light incident surface 31 is formed to have a predetermined width in the first width direction Y. The light incident surface 31 has a function of condensing light emitted from the light source 21 in the second width direction Z. The light incident on the light incident surface 31 from the light source 21 is condensed while traveling in the second width direction Z in the light guide 30.
The slit portion 32 is a groove for totally reflecting the light condensed by the light incident surface 31. The slit portion 32 is provided on an exposed outer surface (i.e., surface) 30a of the light guide 30, and extends in a straight line along the longitudinal direction X. The surface 30a is formed in a planar shape. The slit portion 32 is formed in a substantially trapezoidal cross-sectional shape having a width on the opening side larger than a width on the bottom side. An inclined surface 32a is formed inside the slit portion 32.
The inclined surface 32a is inclined with respect to the surface 30a. The inclined surface 32a is provided at a position aligned with the light source 21 across the light incident surface 31 in the second width direction Z when viewed from the light source 21. The inclined surface 32a is formed to have a predetermined width in the first width direction Y. The inclined surface 32a and the light incident surface 31 are disposed apart from each other by a predetermined distance.
The light reflection surface 33 is a surface that totally reflects the light condensed by the light incidence surface 31 toward the first width direction Y. The light reflection surface 33 is the inclined surface 32a. The light reflecting surface 33 is inclined with respect to the surface 30a and extends in a straight line along the longitudinal direction X. The light incident on the light incident surface 31 from the light source 21 is condensed while traveling in the second width direction Z in the light guide 30, and then reflected by the light reflecting surface 33 toward the first width direction Y.
The light-emitting-direction light diffusing portion 34 diffuses the light reflected by the light reflecting surface 33 in the longitudinal direction X while further reflecting the light in the second width direction Z. The light-emission-direction light diffusion portion 34 has a groove 34a. The groove 34a is a groove for reflecting light traveling in the first width direction Y from the light reflection surface 33 in the light guide 30 toward a direction including the second width direction Z and the longitudinal direction X. The groove 34a is formed on the same inner surface (i.e., back surface) 30b of the light guide 30 as the surface on which the light incident surface 31 is formed. The groove 34a extends along the longitudinal direction X of the light guide 30. The groove 34a has a prescribed groove width. The cross section of the groove 34a is formed in an R-plane shape. The groove 34a is formed to have a prescribed width in the first width direction Y.
A plurality of grooves 34a are provided. The plurality of grooves 34a extend substantially parallel to each other and are arranged at a predetermined pitch distance in the first width direction Y. The portion of the back surface 30b where the groove 34a is provided may be inclined with respect to the portion parallel to the front surface 30a. In this case, the inclination of the rear surface portion may be formed so as to be closer to the surface 30a in the second width direction Z as the portion distant from the inclined surface 32a in the first width direction Y.
The light guiding distance of the light guiding body 30 in the first width direction Y from the light reflecting surface 33 to the groove 34a is set to a predetermined distance in advance. The light reflected by the light reflection surface 33 travels in the first width direction Y in the light guide 30, reaches the groove 34a, and is reflected by the groove 34a in the direction including the second width direction Z and the longitudinal direction X, and travels again in the light guide 30. The light guide thickness of the light guide 30 in the second width direction Z from the groove 34a to the light emitting surface 35 is set to a predetermined thickness in advance. The light reaching the groove 34a travels in the light guide 30 in the direction including the second width direction Z and the length direction X, and finally reaches the light emitting surface 35.
The light emitting surface 35 is a surface from which light from the light source 21 is emitted to the outside. The light emitting surface 35 is formed on the surface 30a of the light guide 30, and is a part of the surface 30a (the range indicated by the region S in fig. 4 (E)). The light emitting surface 35 is formed in a planar shape so as to extend in the longitudinal direction X in parallel with the slit portion 32 in the surface 30a. The light emitting surface 35 is provided at a position of the surface 30a offset toward one side in the first width direction Y with respect to the slit portion 32, specifically, at a position facing the light emitting direction light diffusion portion 34 in the second width direction Z. The light from the light-emitting-direction light diffusion section 34 is emitted to the outside through the light-emitting surface 35.
The longitudinal light diffusion section 36 diffuses light emitted from the light source 21 in the first width direction Y in the longitudinal direction X. Light diffused in the longitudinal direction X from the longitudinal direction light diffusion portion 36 is emitted from the longitudinal direction end side of the light emitting surface 35 to the outside. The longitudinal light diffusion portion 36 protrudes from the rear surface 30b of the light guide 30 in the second width direction Z, and is disposed so as to be adjacent to the light source 21 in the first width direction Y.
As shown in fig. 6, 7, 8, 9, and 10, the longitudinal light diffusion portion 36 has a first light diffusion portion 36a and a second light diffusion portion 36b. The first light diffusion portion 36a and the second light diffusion portion 36b are disposed so as to face each other in the first width direction Y with the light source 21 interposed therebetween. The first light diffusion portion 36a and the second light diffusion portion 36b protrude from the rear surface 30b of the light guide 30 in the second width direction Z, respectively. The first light diffusion portion 36a and the second light diffusion portion 36b shield light emitted from the light source 21 in the first width direction Y, and reflect and diffuse the light in the longitudinal direction X.
The first light diffusion portion 36a is disposed on one side (specifically, on the side closer to the light emitting surface 35 as shown in fig. 9) in the first width direction Y with respect to the light source 21. As shown in fig. 10, the protruding shape of the first light diffusing portion 36a protruding from the back surface 30b is a triangle or a heart shape that is symmetric laterally in the longitudinal direction X so as to be curved with a predetermined curvature from the central portion in the longitudinal direction X to the end portion in the longitudinal direction X toward the surface of the first width direction Y facing the light source 21 when viewed from the second width direction Z. The first light diffusion portion 36a shields or reflects light emitted from the light source 21 toward the side of the first width direction Y near the light emitting surface 35 in the longitudinal direction X and diffuses the light toward both sides in the longitudinal direction X.
The second light diffusion portion 36b is disposed on the other side (specifically, on the side away from the light emitting surface 35 as shown in fig. 9) in the first width direction Y with respect to the light source 21. As shown in fig. 10, the protruding shape of the second light diffusing part 36b protruding from the back surface 30b is a long plate shape that is laterally symmetrical in the longitudinal direction X so as to be bent and extended with a predetermined curvature from the central portion in the longitudinal direction X to the end portion in the longitudinal direction X toward the surface of the first width direction Y facing the light source 21, as viewed from the second width direction Z. The second light diffusion portion 36b diffuses light emitted from the light source 21 toward the side away from the light emitting surface 35 in the first width direction Y toward the light emitting surface 35 side including the first width direction Y and the longitudinal direction X, and reflects the light toward both sides in the longitudinal direction X.
The curvature of the second light diffusion portion 36b is smaller than the curvature of the first light diffusion portion 36 a. The second light diffusion portion 36b is formed in a larger shape than the first light diffusion portion 36 a. Specifically, the length between the longitudinal direction X ends of the second light diffusion sections 36b is longer than the length between the longitudinal direction X ends of the first light diffusion sections 36 a.
As shown in fig. 6, each of the first light diffusion portion 36a and the second light diffusion portion 36b has a rib function of pressing the substrate 25 on which the light source 21 is mounted toward the housing cover 10. A columnar rib 36c is provided to protrude from each of the protruding distal ends of the first light diffusion portion 36a and the second light diffusion portion 36b. The substrate 25 on which the light source 21 is mounted is sandwiched between the top end surfaces of the ribs 36c of the first light diffusion sections 36a and the inner surface of the housing cover 10, and is sandwiched between the top end surfaces of the ribs 36c of the second light diffusion sections 36b and the inner surface of the housing cover 10.
Next, the operation of the illumination device 1 will be described.
The lighting device 1 is controlled to emit light by a controller in a state where the light source unit 20 is wired to a power source on the vehicle side. For example, the light source 21 is controlled to emit light in accordance with the opening and closing of the door.
In the lighting device 1, when the light source 21 emits light, as shown by a broken line in fig. 9, the light emitted in the second width direction Z (specifically, the lower side facing the rear surface 30b of the light guide 30) of the light is condensed while traveling in the second width direction Z in the light guide 30 after entering the light incident surface 31 of the light guide 30. The condensed light is reflected by the inclined surface 32a of the slit portion 32, that is, the light reflection surface 33, and then travels in the first width direction Y in the light guide 30. After reaching the groove 34a of the light-emitting-direction light diffusing part 34, the light reflected by the light reflecting surface 33 is reflected by the groove 34a in a direction including the second width direction Z and the longitudinal direction X, and travels in the direction inside the light guide 30, whereby the light diffuses in the longitudinal direction X. After reaching the light emitting surface 35, the light is emitted to the outside through the light emitting surface 35.
As shown by the broken line in fig. 10, light emitted from the light source 21 toward one side in the first width direction Y is blocked by the first light diffusion portion 36a of the longitudinal light diffusion portion 36 toward the surface of the first width direction Y facing the light source 21 or is reflected in the longitudinal direction X. Further, of the light emitted from the light source 21, the light emitted to the other side in the first width direction Y is reflected by the surface of the second light diffusion portion 36b of the longitudinal light diffusion portion 36 facing the light source 21 in the first width direction Y in the direction including the light emitting surface 35 side in the first width direction Y and the longitudinal direction X. The reflected light travels in the longitudinal direction X while approaching the rear surface 30b of the light guide 30, and is diffused. Then, the light reaches the light emitting surface 35 and is emitted to the outside.
Further, among the lights emitted from the light source 21, a part of the lights other than the lights described above (for example, lights emitted in the second width direction Z (specifically, the upper side not facing the rear surface 30b of the light guide 30) and the like) reflected by the rear surface 30b of the light guide 30 is reflected by the housing cover 10 toward the rear surface 30b of the light guide 30. The light reflected toward the back surface 30b of the light guide 30 finally travels in the light guide 30 and is converted into light on the light guide 30 side. However, the light reaches the light emitting surface 35 and is emitted to the outside.
The light emitted from the light emitting surface 35 is formed in a planar shape or a strip shape on the surface 30a of the light guide 30 in a state of extending in both the longitudinal direction X and the first width direction Y. Therefore, according to the lighting device 1, the light source 21 on the surface mounting side can be used to emit light in a planar or band shape from the light emitting surface 35. The light emitted from the light emitting surface 35 is emitted from the lower surface side of the inner handle frame to the outside and reaches the vehicle interior. Thereby, the lighting device 1 emits light to illuminate the inner handle frame.
Next, effects of the illumination device 1 will be described.
In the lighting device 1, the light guide 30 has a longitudinal light diffusion portion 36 for diffusing light emitted from the light source 21 in the first width direction Y along the light emitting surface 35 of the light guide 30 in the longitudinal direction X. According to the above configuration, the light emitted from the light source 21 in the first width direction Y is diffused in the longitudinal direction X by the longitudinal light diffusion portion 36 of the light guide 30. When the light from the light source 21 spreads in the longitudinal direction X, the light can be made to travel to the longitudinal end side of the light guide 30, and the light emitted from the surface 30a of the light guide 30 to the outside can be formed into a plane or a strip shape extending in the longitudinal direction X.
As described above, the light source 21 is a surface-mounted LED lamp, and the linear distance from the light source 21 to the light emitting surface 35 (i.e., the distance in the second width direction Z) is relatively short. However, as described above, since the light emitted from the light source 21 in the first width direction Y is diffused in the longitudinal direction X by the longitudinal light diffusion portion 36, the optical path length from the light source 21 to the light emitting surface 35 becomes longer than the above-described straight distance. Therefore, the optical path length from the light source 21 can be sufficiently ensured to diffuse light to the longitudinal direction X end portion of the light guide 30, and uniformity of the light emitting surface 35 that emits light using the surface mount type light source 21 can be improved. Therefore, the light emitting surface 35 can uniformly emit light in a planar shape or a band shape.
For example, as shown in fig. 11, the illuminance at a position 50 mm away from the surface 30a of the light guide 30 is about the light source 21, and the illuminance decreases as the position is away from the center in the longitudinal direction X. However, when the case where the longitudinal light diffusion portion 36 is provided in the light guide 30 is compared with the case where the longitudinal light diffusion portion 36 is not provided in the light guide 30, the illuminance hardly changes.
On the other hand, as shown in fig. 12, 13 and 14, the luminance of the surface 30a of the light guide 30 is smaller as the position in the longitudinal direction X is away from the light source 21 with the light source 21 as the center, and the luminance changes when comparing the case where the longitudinal direction light diffusion portion 36 is provided in the light guide 30 with the case where the longitudinal direction light diffusion portion 36 is not provided in the light guide 30. Specifically, when the longitudinal light diffusion portion 36 is provided in the light guide 30, the luminance at a position near the light source 21 becomes smaller and the luminance at a position apart from the light source 21 in the longitudinal direction X (for example, a position separated by 20 cm) becomes larger than when the longitudinal light diffusion portion 36 is not provided in the light guide 30.
That is, if the longitudinal light diffusion portion 36 is provided in the light guide 30 as in the illumination device 1, the light emission state of the longitudinal central portion of the light guide 30 becomes darker and the light emission state of the longitudinal end portion of the light guide 30 becomes lighter than in the case where the longitudinal light diffusion portion 36 is not provided in the light guide 30. Therefore, uniformity of the light emitting surface 35 that emits light using the surface mount type light source 21 is improved.
Further, since the light source 21 is a surface-mounted LED lamp, the component cost can be reduced as compared with a shell-type LED lamp. Therefore, the light emitting surface 35 can uniformly emit light in a planar shape or a band shape using the inexpensive light source 21. Even if the distance from the light source 21 to the longitudinal light diffusion portion 36 in the first width direction Y is short, the light from the light source 21 is diffused in the longitudinal direction X by the longitudinal light diffusion portion 36. Therefore, the size of the lighting device 1 in the first width direction Y can be shortened, and the lighting device 1 can be made thin and slim.
The longitudinal light diffusion section 36 includes a first light diffusion section 36a for diffusing light emitted from the light source 21 toward one side in the first width direction Y in the longitudinal direction X, and a second light diffusion section 36b for diffusing light emitted from the light source 21 toward the other side in the first width direction Y in the longitudinal direction X. According to the above configuration, both the light emitted from the light source 21 toward one side in the first width direction Y and the light emitted from the light source 21 toward the other side in the first width direction Y can be diffused in the longitudinal direction X, so that the light from the light source 21 can be efficiently diffused to the longitudinal end portion of the light guide 30.
In particular, the second light diffusion portion 36b on the side away from the light emitting surface 35 in the first width direction Y is formed in a larger shape (specifically, a shape in which the length between the ends in the longitudinal direction X is relatively long) than the first light diffusion portion 36a on the side closer to the light emitting surface 35 in the first width direction Y. In this case, the amount of light reflected by the second light diffusion portion 36b and diffused in the longitudinal direction X can be made larger than the amount of light reflected by the first light diffusion portion 36a and diffused in the longitudinal direction X among the light from the light source 21. Therefore, more light can be diffused toward the longitudinal direction X end of the light guide 30 using the second light diffusion portion 36b on the side away from the light emitting surface 35 in the first width direction Y, and efficient and effective light diffusion can be achieved.
The longitudinal light diffusion portion 36 protrudes from the rear surface 30b of the light guide 30 in the second width direction Z, and has a rib function of pressing the substrate 25 on which the light source 21 is mounted toward the housing 10 by a columnar rib 36c provided at the protruding distal end portion thereof. In this case, the substrate 25 is sandwiched between the distal end surfaces of the ribs 36c of the longitudinal light diffusion sections 36 and the inner surface of the housing cover 10. Therefore, the substrate 25 on which the light source 21 is mounted can be fixed between the longitudinal light diffusion section 36 and the housing cover 10 by using the longitudinal light diffusion section 36, and the light source 21 can be diffused in the longitudinal direction X.
The light guide 30 includes a light incident surface 31 for condensing light emitted from the light source 21 in the second width direction Z, a light reflecting surface 33 for reflecting light condensed by the light incident surface 31 in the first width direction Y, and a light emitting direction light diffusing portion 34 for diffusing light reflected by the light reflecting surface 33 in the longitudinal direction X. According to the above configuration, light emitted from the light source 21 in the second width direction Z travels by being reflected in the first width direction Y, and thereafter, the light travels toward the light emitting surface 35 while being diffused in the longitudinal direction X.
The optical path length from the light source 21 to the light emitting surface 35 is longer than the linear distance between the light source 21 and the light emitting surface 35. Therefore, the optical path length from the light source 21 can be sufficiently ensured, and the light can be diffused to the longitudinal end of the light guide 30, and the light uniformity of the light emitting surface 35 can be improved. Therefore, the light emitting surface 35 can be uniformly emitted in a planar shape or a band shape using the surface-mounted light source 21.
The light reflection surface 33 of the light guide 30 is an inclined surface 32a formed inside the slit portion 32 provided on the surface 30a of the light guide 30 so as to extend in the longitudinal direction X. The slit portion 32 of the surface 30a of the light guide 30 forms a light reflection surface 33 that reflects light emitted from the light source 21 in the second width direction Z in the first width direction Y. Therefore, in order to sufficiently secure the optical path length from the light source 21 to the light emitting surface 35, the slit portion 32 may be formed on the surface 30a of the light guide 30 to form the light reflecting surface 33 for reflecting the light from the light source 21.
The light-emitting-direction light diffusion portion 34 of the light guide 30 has a plurality of grooves 34a provided on the rear surface 30b of the light guide 30 so as to extend in the longitudinal direction X. The grooves 34a are arranged at a predetermined pitch distance in the first width direction Y. Each groove 34a reflects light traveling in the first width direction Y in the light guide 30 from the light reflection surface 33 toward the second width direction Z and causes the light to travel. Therefore, the width of the light emitting surface 35 in the first width direction Y of the emitted light can be further increased while ensuring uniformity of the light emitting region, or the light quantity per unit area can be increased while maintaining the width of the light emitting surface 35 in the first width direction Y as it is.
However, in the above embodiment, the lighting device 1 is mounted to the inner handle bezel, and the light emitting surface 35 thereof is located on the lower surface. However, the present invention is not limited to this, and may be applied to a structure in which the lighting device 1 is mounted on an instrument panel, a center console, or the like, and the light emitting surface 35 thereof is located on the upper surface or the side surface.
In the above embodiment, the lighting device 1 is mounted on the interior of the vehicle. However, the present invention is not limited to this, and may be applied to a structure in which the lighting device 1 is mounted at a position other than a vehicle, where light and thin structure is required.
The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the scope of the present invention.
Claims (7)
1. An illumination device, comprising:
a surface-mounted light source that emits light; and
a light guide body extending in a predetermined direction for guiding light emitted from the light source, wherein,
the light source is disposed on the back side of the light guide body,
the light guide body has:
a light emitting surface formed on a surface and expanding in a longitudinal direction and a first width direction orthogonal to the longitudinal direction to radiate light from the light source to the outside; and
a longitudinal light diffusion section disposed on the first widthwise side with respect to the light source,
the longitudinal light diffusion portion protrudes from the back surface of the light guide body in a second width direction orthogonal to both the first width direction and the longitudinal direction, and diffuses light emitted from the light source in the first width direction while being reflected in the longitudinal direction at a surface facing the light source and approaching the back surface of the light guide body.
2. The lighting device of claim 1, wherein,
the longitudinal light diffusion portion has a rib function of pressing the substrate on which the light source is mounted toward the housing cover.
3. The lighting device according to claim 1 or 2, wherein,
the longitudinal light diffusion section includes:
a first light diffusion section disposed on a side of the light source, which is closer to the light emitting surface in the first width direction; and
and a second light diffusion portion disposed on a side of the light source away from the light emitting surface in the first width direction.
4. The lighting device according to claim 3, wherein,
the second light diffusion portion is formed in a larger shape than the first light diffusion portion.
5. The lighting device of claim 1, wherein,
the light guide body has:
a light incident surface that condenses light emitted from the light source in a second width direction orthogonal to both the first width direction and the longitudinal direction;
a light reflection surface that reflects the light condensed by the light incidence surface in the first width direction; and
and a light-emitting-direction light diffusing unit that diffuses light reflected by the light reflecting surface in the longitudinal direction.
6. The lighting device of claim 5, wherein,
the light reflecting surface is an inclined surface formed on the inner side of a slit portion extending in the longitudinal direction of the light guide body.
7. The lighting device according to claim 5 or 6, wherein,
the light-emitting-direction light diffusion portion has a plurality of grooves extending along the longitudinal direction of the light guide body, respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-092785 | 2020-05-27 | ||
| JP2020092785A JP7283442B2 (en) | 2020-05-27 | 2020-05-27 | lighting equipment |
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| Publication Number | Publication Date |
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| CN113739099A CN113739099A (en) | 2021-12-03 |
| CN113739099B true CN113739099B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN1690748A (en) * | 2004-04-28 | 2005-11-02 | 斯坦雷电气株式会社 | Lighting device |
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| CN105465711A (en) * | 2014-09-29 | 2016-04-06 | 本田技研工业株式会社 | Illuminator |
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| JP2012018917A (en) | 2010-06-08 | 2012-01-26 | Fujikura Ltd | Plane light-emitting device and sheet switch module |
| JP6288443B2 (en) | 2014-04-10 | 2018-03-07 | オムロン株式会社 | Light guide plate and surface light source device |
| US10322669B2 (en) | 2015-06-11 | 2019-06-18 | Innotec, Corp. | Mirror with integral light pipe illumination |
| JP6846189B2 (en) | 2016-06-27 | 2021-03-24 | 株式会社小糸製作所 | Vehicle lighting |
| JP6703312B2 (en) | 2018-05-31 | 2020-06-03 | 日亜化学工業株式会社 | Light emitting module and surface emitting light source |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690748A (en) * | 2004-04-28 | 2005-11-02 | 斯坦雷电气株式会社 | Lighting device |
| CN102788302A (en) * | 2011-05-18 | 2012-11-21 | 斯坦雷电气株式会社 | Vehicle lighting unit |
| EP2524841A2 (en) * | 2011-05-18 | 2012-11-21 | Stanley Electric Co., Ltd. | Vehicle lighting unit |
| CN103574407A (en) * | 2012-07-27 | 2014-02-12 | 丰田合成株式会社 | Linear lighting device |
| CN105465711A (en) * | 2014-09-29 | 2016-04-06 | 本田技研工业株式会社 | Illuminator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7283442B2 (en) | 2023-05-30 |
| CN113739099A (en) | 2021-12-03 |
| JP2021187240A (en) | 2021-12-13 |
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