EP3336418A1 - Dispositif électroluminescent - Google Patents

Dispositif électroluminescent Download PDF

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Publication number
EP3336418A1
EP3336418A1 EP17161574.3A EP17161574A EP3336418A1 EP 3336418 A1 EP3336418 A1 EP 3336418A1 EP 17161574 A EP17161574 A EP 17161574A EP 3336418 A1 EP3336418 A1 EP 3336418A1
Authority
EP
European Patent Office
Prior art keywords
light emitting
shielding cap
light shielding
light
emitting device
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.)
Withdrawn
Application number
EP17161574.3A
Other languages
German (de)
English (en)
Inventor
Ching-Tsung Ni
Tai-Jung Sung
Kuo-Hui Chang
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.)
Lite On Electronics Guangzhou Co Ltd
Lite On Technology Corp
Original Assignee
Lite On Electronics Guangzhou Co Ltd
Lite On Technology Corp
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 Lite On Electronics Guangzhou Co Ltd, Lite On Technology Corp filed Critical Lite On Electronics Guangzhou Co Ltd
Publication of EP3336418A1 publication Critical patent/EP3336418A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • 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
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • 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
    • F21V7/0066—Reflectors for light sources specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified
    • 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
    • F21V7/04—Optical design
    • F21V7/041—Optical design with conical or pyramidal surface
    • 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
    • F21V7/04—Optical design
    • F21V7/048—Optical design with facets structure
    • 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • 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
    • F21Y2101/00—Point-like light sources
    • 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]

Definitions

  • the invention relates to a light emitting device, and particularly relates to a light emitting device capable of reducing reflected light and changing a focused position of incident light.
  • Most of the conventional traffic light devices with a surface light source include a front cover, a rear cover, a point light source, and an internal element.
  • the front cover has a lens part, a containing space is defined by the front cover and the rear cover, the point light source and the internal element are disposed on the rear cover and located in the containing space.
  • the incident ambient light is irradiated onto the rear cover and reflected out of the front cover.
  • a viewer may be misled to perceive that the traffic light device emits light. The safety on the road is thus affected.
  • the front cover since the front cover has the lens part, the ambient light emitted into the containing space may be focused onto the internal element, and the high temperature is therefore generated at the focused position. So, the internal element may be damaged. Hence, how to modify the traffic light device with the surface light source has become an issue to work on.
  • a light emitting device is capable of reducing a chance that ambient light is reflected to a viewer after being irradiated into a casing, and is also capable of changing a focused position of the incident ambient light.
  • a light emitting device includes a casing, a light shielding cap, and a light emitting unit.
  • the light shielding cap is disposed in the casing and has a containing opening and a plurality of cavity structures surrounding the containing opening. Each of the cavity structures is adapted to reflect ambient light emitted into the casing for multiple times.
  • the light emitting unit is disposed in the casing and is disposed in the containing opening correspondingly.
  • the casing includes a front cover and a rear cover.
  • the front cover is assembled to the rear cover to define a containing space.
  • the light shielding cap and the light emitting unit are located in the containing space.
  • the front cover has a lens part, and the ambient light enters the casing through the lens part.
  • the light shielding cap and the light emitting unit are disposed on the rear cover of the casing.
  • a first vertical distance is provided between a side of the light shielding cap relatively adjacent to the light emitting unit and the rear cover
  • a second vertical distance is provided between another side of the light shielding cap relatively distant to the light emitting unit and the rear cover, and the second vertical distance is greater than the first vertical distance
  • the light shielding cap is in a funnel shape.
  • the light emitting device further includes at least one internal element.
  • the at least one internal element is disposed on the rear cover of the casing, and an orthogonal projection of the light shielding cap on the rear cover is overlapped with an orthogonal projection of the internal element on the rear cover.
  • the light shielding cap is disposed in parallel with the rear cover.
  • the light emitting device further includes a plurality of support elements.
  • the support elements are disposed between the light shielding cap and the rear cover, so as to define an accommodating space between the light shielding cap and the rear cover.
  • a shape of each of the cavity structures from a top perspective includes a polygonal shape, a circular shape, an elliptical shape, or an irregular shape.
  • a ratio of a depth to a width of each of the cavity structures is in a range from 1 to 100.
  • a surface of the light shielding cap is coated with a light absorbing material.
  • depths of the cavity structures of the light shielding cap are the same or different.
  • a light shielding angle of the light shielding cap is greater than a light emitting angle of the light emitting unit.
  • the light shielding cap includes a first light shielding cap and a second light shielding cap.
  • the first light shielding cap is assembled to the second light shielding cap, and the first light shielding cap is located between the second light shielding cap and the light emitting unit.
  • the light shielding cap has a plurality of cavity structures, and the cavity structures are adapted to reflect the ambient light emitted into the casing for multiple times. Therefore, the cavity structures may absorb the ambient light to reduce the chance that the ambient light is reflected to the viewer after being irradiated into the casing. Accordingly, when the light emitting unit is not lit up, the viewer may be prevented from being misled to perceive that the light emitting device emits light.
  • the design of the cavity structures of the light shielding cap of the invention may further change the focused position of the ambient light, so as to avoid damages to the internal elements due to a high temperature caused by focusing of the light. It is noted that the design according to the present invention is of particularly use for traffic light devices with a surface light source including a front cover, a rear cover, a point light source, and an internal element.
  • FIG. 1A is a schematic perspective view illustrating a light emitting device according to an embodiment of the invention.
  • FIG. 1B is a schematic cross-sectional view illustrating the light emitting device of FIG. 1A .
  • FIG. 1C is a schematic perspective view illustrating a light shielding cap of FIG. 1B .
  • FIG. 1D is a partial schematic perspective cross-sectional view illustrating the light shielding cap of FIG. 1C .
  • a light emitting device 100 of the embodiment includes a casing 110, a light shielding cap 120a, and a light emitting unit 130.
  • the light shielding cap 120a is disposed in the casing 110 and has a containing opening 122 and a plurality of cavity structures 124a surrounding the containing opening 122.
  • each of the cavity structures 124a is adapted to reflect ambient light L emitted into the casing 110 for multiple times.
  • the light emitting unit 130 is disposed in the casing 110, and is disposed in the containing opening 122 of the light shielding cap 120a correspondingly.
  • the casing 110 of the embodiment includes a front cover 112 and a rear cover 114.
  • the front cover 112 is assembled to the rear cover 114 to define a containing space S.
  • the light shielding cap 120a and the light emitting unit 130 are located in the containing space S.
  • the front cover 112 has a lens part 112a, and the ambient light L enters the casing 110 through the lens part 112a.
  • the light shielding cap 120a and the light emitting unit 130 are disposed on the rear cover 114 of the casing 110.
  • a circuit board 150 is disposed on the rear cover 114 of the embodiment, and the light emitting unit 130 and the light shielding cap 120a are disposed on the circuit board 150.
  • the light emitting unit 130 and the circuit board 150 are electrically connected.
  • the light emitting device 100 of the embodiment also includes a lens 160.
  • the lens 160 is disposed in the containing opening 122 and covers the light emitting unit 130.
  • the light shielding cap 120a of the embodiment is a mask with a substantially uniform thickness.
  • the light shielding cap 120a has a plurality of cavity structures 124a.
  • depths of the cavity structures 124a may be the same or different.
  • the light shielding cap 120a may have the cavity structures 124a with the same depth, or alternatively have the cavity structures 124a with different depths.
  • the invention does not intend to impose a limitation in this regard.
  • the light shielding cap 120a may be manufactured by using a dark and light-absorbing material, for example. However, the invention does not intend to impose a limitation in this regard.
  • a shape of the cavity structure 124a of the embodiment from a top perspective may be a polygonal shape, a circular shape, an elliptical shape, or an irregular shape, for example.
  • the cavity structures 124a include a plurality of cavity structures 124a1 and a plurality of cavity structures 124a2.
  • the shape of the cavity structure 124a1 from a top perspective is implemented to be a hexagonal shape, whereas the cavity structure 124a2 is located on the edge of the light shielding cap 120a, and the shape of the cavity structure 124a2 from a top perspective is implemented to be an irregular shape due to an insufficient area.
  • cavity structures 124b of a light shielding cap 120b include a plurality of cavity structures 124b1, a plurality of cavity structures 124b2, and a plurality of cavity structures 124b3.
  • a shape of the cavity structure 124b1 from a top perspective is implemented to be a hexagonal shape, whereas the cavity structures 124b2 and 124b3 are located on the edge of the light shielding cap 120a, and a shape of the cavity structure 124b2 and a shape of the cavity structure 124b3 from a top perspective are respectively implemented to be an irregular shape and a circular shape due to an insufficient area.
  • the cavity structures 124a and 124b of the light shielding caps 120a and 120b are distributed on and across surfaces 121a and 121b.
  • the cavity structures 124a and 124b are tightly adjacent to each other and are roughly arranged into an array.
  • the invention does not intend to impose a limitation in this regard.
  • cavity structures 124c of a light shielding cap 120c are implemented as concentric circles arranged outward one circle after another along a containing opening 122c.
  • a shape of the cavity structure 124c from a top perspective is implemented to be a circular shape.
  • a ratio of a depth D to a width W of the cavity structure 124a is preferably in a range from 1 to 100. Since the ratio of the depth D to the width W of the cavity structure 124a of the embodiment is in the range from 1 to 100, when the incident ambient light L is irradiated to the cavity structure 124a, the incident ambient light L may be reflected and spread for multiple times and thus be absorbed by the cavity structure 124a. In other words, the design of the cavity structure 124a of the embodiment may facilitate a ratio of absorption of the incident ambient light L, and reduce a chance that the ambient light L is reflected to a viewer.
  • a first vertical distance H1 is provided between a side S1 of the light shielding cap 120a relatively adjacent to the light emitting unit 130 and the rear cover 114
  • a second vertical distance H2 is provided between another side S2 of the light shielding cap 120a relatively distant to the light emitting unit 130 and the rear cover 114.
  • the second vertical distance H2 is greater than the first vertical distance H1.
  • the shielding cap 120a of the embodiment is substantially in a funnel shape, as shown in FIG. 1C .
  • a light shielding angle A1 of the light shielding cap 120a of the embodiment is greater than a light emitting angle A2 of the light emitting unit 130.
  • the light emitting unit 130 is a point light source, for example, such as a red light emitting diode, a green light emitting diode, or a yellow light emitting diode.
  • the invention is not limited thereto.
  • the light shielding angle A1 is in a range from 141 degrees to 180 degrees, for example, and the light emitting angle A2 of the light emitting unit 130 is in a range from 0 degrees to 140 degrees, for example.
  • the light shielding angle A1 of the light shielding cap 120a of the embodiment is greater than the light emitting angle A2 of the light emitting unit 130, disposing the light shielding cap 120a does not confine and block a range of light emission of the light emitting unit 130.
  • the light emitting device 100 of the embodiment further includes at least one internal element (two internal elements 140a and 140b are shown in FIG. 1B for schematic illustration).
  • the at least one internal element is disposed on the rear cover 114 of the casing 110.
  • the internal elements 140a and 140b is a chip, a circuit board, or a combination thereof, for example.
  • an orthogonal projection of the light shielding cap 120a on the rear cover 114 is overlapped with orthogonal projections of the internal elements 140a and 140b on the rear cover 114. Therefore, when the ambient light L is emitted into the containing space S of the casing 110, the cavity structures 124a of the light shielding cap 120a may reflect and spread the ambient light L emitted into the casing 110 for multiple times.
  • the energy of the ambient light L may be absorbed and reduced, and the cavity structures 124a may also absorb the heat.
  • the light shielding cap 120a is disposed in front of the internal elements 140a and 140b. Therefore, a position of a focal point of the ambient light L may be changed through disposing the cavity structures 124a.
  • the position of the focal point of the incident ambient light L may be prevented from being located at the internal elements 140a and 140b, so as to avoid damages to the internal elements 140a to 140b due to a high temperature.
  • a light path of the ambient light L is distorted, and the energy of the ambient light L is received, so as to reduce the reflected light.
  • the light shielding cap 120b of the embodiment is not manufactured by using a dark light absorbing material.
  • the surface 121b of the light shielding cap 120b may be coated with a light absorbing material 125.
  • the light absorbing material 125 includes carbon nanotube, black resin, or other dark coating materials, for example.
  • the surface 121b of the light shielding cap 120b is coated with the light absorbing material 125, the ratio of absorption of the ambient light L by the light shielding cap 120b is facilitated, and the chance that the incident ambient light L is reflected to the viewer is reduced.
  • a light shielding cap 120d of a light emitting device 100' includes a first light shielding cap 120d1 and a second light shielding cap 120d2.
  • the first light shielding cap 120d1 is assembled to the second light shielding cap 120d2, and the first light shielding cap 120d1 is located between the second light shielding cap 120d2 and the light emitting unit 130.
  • cavity structures 124d1 of the first light shielding cap 120d1 are implemented as concentric circles arranged outward one circle after another.
  • a shape of the cavity structure 124d1 from a top perspective is a circular shape, for example, and a shape of a cavity structure 124d2 of the second light shielding cap 120d2 from a top perspective is a hexagonal shape, for example.
  • the invention is not limited thereto.
  • the ambient light L when the ambient light L is emitted into the containing space S of the casing 110, the ambient light L is reflected and spread for multiple times in the cavity structures 124a, 124b, 124c, 124d1, and 124d2 of the light shielding caps 120a, 120b, 120c, and 120d and thus absorbed. Accordingly, the chance that the ambient light L is reflected to the viewer after being irradiated into the casing 110 is reduced.
  • the design of the light shielding caps 120a, 120b, 120c, and 120d may advance or interfere with the focused position of the ambient light L as well as receiving the energy of the incident ambient light L. Accordingly, the focused point may be prevented from being located at the internal elements 140a and 140b, thereby avoiding the damages to the internal elements 140a and 140b due to a high temperature.
  • FIG. 5 is a schematic cross-sectional view illustrating a light emitting device according to still another embodiment of the invention.
  • a light emitting device 100a of the embodiment is similar to the light emitting device 100 of FIG. 1B , but differ in that a light shielding cap 120e of the embodiment is disposed to be substantially parallel to the rear cover 114, and the light emitting device 100a of the embodiment further includes a plurality of support element 170 disposed on the rear cover 114 to support the light shielding cap 120e.
  • the support columns 170 of the embodiment are located between the light shielding cap 120e and the rear cover 114 to define a containing space R between the light shielding cap 120e and the rear cover 114.
  • the internal elements 140a and 140b are located in the containing space R.
  • the design of the light shielding cap 120e may advance or interfere with the focused position of the ambient light L as well as receiving the energy of the incident ambient light L. Accordingly, the focused point may be prevented from being located at the internal elements 140a and 140b, thereby avoiding the damages to the internal elements 140a and 140b due to a high temperature.
  • the light shielding cap 120e is disposed to be substantially horizontal. Namely, a light shielding angle A1' of the light shielding cap 120e is configured to be 180 degrees, and a shape of the cavity structure 124e from a top perspective is configured to be a hexagonal shape.
  • FIG. 1D reference is made to FIG. 1D .
  • the invention is not limited thereto.
  • FIG. 6 is a schematic cross-sectional view illustrating a light emitting device according to still another embodiment of the invention.
  • a light emitting device 100b of the embodiment is similar to the light emitting device 100a of FIG. 5 , but differs in that a light shielding cap 120f of the embodiment includes a first light shielding cap 120f1 and a second light shielding cap 120f2.
  • the first light shielding cap 120f1 is assembled to the second light shielding cap 120f2, and the first light shielding cap 120f1 is located between the second light shielding cap 120f2 and the light emitting unit 130.
  • cavity structures 124f1 of the first light shielding cap 120f1 are implemented as concentric circles arranged outward one circle after another.
  • a shape of the cavity structure 124f1 from a top perspective is a circular shape, for example, and a shape of a cavity structure 124f2 of the second light shielding cap 120f2 from a top perspective is a hexagonal shape, for example.
  • FIG. 4B a shape of the cavity structure 124f1 from a top perspective is a circular shape, for example, and a shape of a cavity structure 124f2 of the second light shielding cap 120f2 from a top perspective is a hexagonal shape, for example.
  • the light shielding cap has a plurality of cavity structures, and the cavity structures are adapted to reflect the ambient light emitted into the casing for multiple times. Therefore, the cavity structures may absorb the ambient light to reduce the chance that the ambient light is reflected to the viewer after being irradiated into the casing. Accordingly, when the light emitting unit is not lit up, the viewer may be prevented from being misled to perceive that the light emitting device emits light.
  • the design of the cavity structures of the light shielding cap of the invention may further change the focused position of the ambient light, so as to avoid damages to the internal elements due to a high temperature caused by focusing of the light.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Planar Illumination Modules (AREA)
  • Led Device Packages (AREA)
EP17161574.3A 2016-12-13 2017-03-17 Dispositif électroluminescent Withdrawn EP3336418A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW105141273 2016-12-13

Publications (1)

Publication Number Publication Date
EP3336418A1 true EP3336418A1 (fr) 2018-06-20

Family

ID=58428066

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Application Number Title Priority Date Filing Date
EP17161574.3A Withdrawn EP3336418A1 (fr) 2016-12-13 2017-03-17 Dispositif électroluminescent

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EP (1) EP3336418A1 (fr)
TW (1) TWI639257B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299091A1 (fr) * 1987-01-19 1989-01-18 Nauchno-Proizvodstevennoe Obiedinenie Po Avtoelektronike I Avtotraktornomu Elektrooborudovaniju Dispositif de signalisation lumineuse
DE102013214342A1 (de) * 2013-07-23 2014-07-10 Siemens Aktiengesellschaft Lichtsignal
US20150036354A1 (en) * 2013-08-02 2015-02-05 Stephen P. Adams Method and apparatus for a light collection and projection system
US20160059873A1 (en) * 2013-03-27 2016-03-03 Siemens Aktiengesellschaft Light signal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7092143B2 (en) 2004-10-19 2006-08-15 Reflectivity, Inc Micromirror array device and a method for making the same
TW201517316A (zh) 2013-10-22 2015-05-01 Lextar Electronics Corp 發光二極體封裝結構以及發光二極體封裝模組

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299091A1 (fr) * 1987-01-19 1989-01-18 Nauchno-Proizvodstevennoe Obiedinenie Po Avtoelektronike I Avtotraktornomu Elektrooborudovaniju Dispositif de signalisation lumineuse
US20160059873A1 (en) * 2013-03-27 2016-03-03 Siemens Aktiengesellschaft Light signal
DE102013214342A1 (de) * 2013-07-23 2014-07-10 Siemens Aktiengesellschaft Lichtsignal
US20150036354A1 (en) * 2013-08-02 2015-02-05 Stephen P. Adams Method and apparatus for a light collection and projection system

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Publication number Publication date
TW201822384A (zh) 2018-06-16
TWI639257B (zh) 2018-10-21

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