EP0874964A1 - An led illuminated lamp assembly - Google Patents
An led illuminated lamp assemblyInfo
- Publication number
- EP0874964A1 EP0874964A1 EP97904726A EP97904726A EP0874964A1 EP 0874964 A1 EP0874964 A1 EP 0874964A1 EP 97904726 A EP97904726 A EP 97904726A EP 97904726 A EP97904726 A EP 97904726A EP 0874964 A1 EP0874964 A1 EP 0874964A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lens
- leds
- light
- horizontal
- upper region
- 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.)
- Granted
Links
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
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- 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
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to an LED (light emitting diode) illuminated lamp assembly which can be utilized in overhead signaling or lighting applications such as in traffic signal lamps or overhead illuminated road signs.
- the assembly is designed to work in combination with an optically powered lens to efficiently redirect light emitted from an LED or a collection of LEDs to specific angles.
- LEDs With recent advances in LED efficiency, it has become practical to offer exterior lighting products which employ LEDs. However, there are different issues to consider when using LEDs where incandescent lamps have historically been used.
- conventional LEDs emit light in a relatively tight radiation pattern that requires the redistribution of that light in order to attain spatial distributions in compliance with, for example. Institute of Transportation Engineers (ITE) requirements or other regulations.
- ITE Institute of Transportation Engineers
- LEDs are heat-sensitive devices and, therefore, heat generated during operation of the LEDs and associated components must be low enough (or dissipated adequately) to assure a reliable operation over extreme temperature ranges.
- a first related LED assembly is disclosed in U.S. Patent 5,174,649 which describes a lamp assembly that utilizes a two- surface lens (with an incident surface having hyperboloids and an exit surface having facets) .
- the hyperboloids of this arrangement translate the LED rays to substantially parallel beams and the facets spread the light out to a desired pattern.
- this design has drawbacks in that it includes a proclivity toward the collection of dirt, oil, ice and other debris which interfere with the light output when used in exterior lighting applications.
- a second related assembly involves a lamp which employs LEDs arranged in concentric circles with a nonpowered lens (i.e., having no lens details). Light emitted from this arrangement produces a symmetrical light distribution. When used in traffic signal applications (where light is only of value below a horizontal axis) , this approach is not as efficient as that used in the lamp assembly of the present invention.
- a third product is disclosed in U.S. Patent No. 5,343,330.
- the assembly is comprised of a lens containing individual "pockets" into which LEDs are inserted. Because these LEDs are inserted into a curved lens, use of a printed wiring board is neither practical nor used. In this product, the LEDs are wired to each other, complicating the assembly or repair methods.
- the lens features of this product are all on the internal surface.
- a further known product is an Electrotech product (Model # 3320OG2) .
- the lamp assembly employs LEDs of distinctly different viewing angles to produce symmetrical light.
- a non-powered lens is utilized with this product. This approach has disadvantages with respect to symmetrical light used in an application where symmetry is not useful. It also provides non-uniform lighting, to give it the appearance of only partial illumination when viewed from different angles.
- an object of the present invention is to provide for an LED illuminated lamp assembly which overcomes the drawbacks of the related products noted above.
- the lens of the present invention is designed to work in combination with specified LEDs to efficiently redirect light emitted from each LED (or collection of LEDs) to specific angles. This provides for a uniformly-illuminated lens in which light emitted through the lens provides for an appearance of full illumination.
- a further object of the present invention is to provide for a lens which can redirect non-parallel rays from multiple LEDs.
- a further object of the present invention is to provide for a lamp assembly which incorporates a flat printed wiring board which is suitable for LED insertion with generally- available electronic assembly methods.
- a further object of the present invention is to provide for a lens with a smooth exterior surface which minimizes the collection of dirt and debris when used in an exterior lighting application.
- a further object of the present invention is to provide for a lens assembly which maximizes light efficiency emitted by a minimal amount of LEDs to meet ITE specifications or other regulations.
- the present invention provides for an LED illuminated lamp assembly which comprises a circuit board assembly having a plurality of rows of LEDs; and a lens having an interior surface and an exterior surface.
- the interior surface of the lens comprises a plurality of horizontal bands with a single band being associated with a row of the LEDs.
- Each of the bands has an upper region and a lower region serving to redirect certain light rays and allow other rays to travel uninterrupted.
- Figure IA shows a front view of the lens of the present invention
- Figure IB shows a side view of the lens assembly of Figure IA
- Figure 2A illustrates detail B-B of the lens feature of Figure IB
- Figure 2B illustrates the redirection of light from multiple LEDs utilizing the lens of the present invention.
- Figure 3 illustrates section 3-3 of the lens feature of Figure 2A
- Figure 4A illustrates a circuit board assembly which can be utilized with the lens of the present invention
- Figure 4B is a side view of Figure 4A;
- Figure 5 illustrates a circuit diagram which can be utilized for the lens of the present invention
- Figure 6 is a front view of a lens of a further embodiment in which the lens is a dome shaped lens
- Figure 7 is a side view of the lens of Figure 6;
- FIG 8 shows detail C of Figure 7
- Figure 9 is a perspective of the lens detail of Figure 7;
- Figure 10 illustrates a further modification for detail C of the lens feature of Figure 7;
- Figure 11 shows section 11-11 from Figure 7.
- the lens 1 includes a plurality of horizontal bands 3 which extend along the width of the lens 1.
- the lens 1 can include an interior surface 5 which includes the horizontal bands 3, and a smooth exterior surface 7.
- the smooth exterior surface 7 minimizes the collection of dirt and debris on the lens when the l ens is used in an overhead exterior lighting or signaling application such as in a traffic signal lamp or an overhead illuminated road sign. Only the interior surface 5 includes the optical details of the horizontal bands 3.
- the lens 1 of the present invention can be mounted over a circuit board assembly 9 as illustrated in Figures 4A and 4B.
- the circuit board assembly 9 includes a plurality of longitudinal rows of LEDs 11 which are spatially positioned on the circuit board assembly 9.
- each of the horizontal bands 3 includes an upper region 3a and a lower region 3b (see Figure 2A) . Details of the upper region and lower region 3a, 3b of the horizontal band 3 can be seen in Figure 2A which shows detail B-B of Figure IB.
- each of the horizontal bands 3 includes a line 15 between the upper region 3a and the lower region 3b.
- the line 15 can be on an optical axis of an associated LED 11, or the LEDs 11 can be located behind the horizontal bands 3 but not centered behind the horizontal bands .
- the upper region 3a of the horizontal band 3 includes a complex surface 17 which can include a first substantially linear surface 17a and a curved surface 17b.
- the upper region 3a including the complex surface 17 having the linear surface 17a and the curved surface 17b tends to refract light rays that are headed upward, downward, in precise desirable directions which are preferable for traffic signal lamps in which lighting below the horizontal axis is desired.
- the lower region 3b of the band 3 is comprised of two parts (19a, 19b) .
- the first part 19a is adjacent to the line 15.
- This first part 19a is a planar or substantially planar window that permits light from the LEDs to pass through as emitted from the LED.
- the second part 19b is positioned between the first part 19a and an upper half of an adjacent horizontal band.
- the second part 19b defines an array of precisely designed vertical grooves 21 which extend from the first part 19a in a linear manner and span along the entire width of each band. The vertical grooves 21 refract light to a desirable horizontal direction and can be seen in detail in Figure 3.
- the lens l of Figure 1 can have a flat configuration as shown in Figure IB. It is also recognized that the lens can be a dome shaped lens having a curvature as illustrated in Figures 6 and 7. As illustrated in Figure 6, in the same manner as Figure 1, the lens 100 of Figure 6 can include a plurality of horizontal bands 300 which extend along the width of the lens 100. As shown in Figure 7, the lens 100 can be a dome shaped lens having a curvature and can include an interior surface 500 which includes the horizontal bands 300, and a smooth exterior dome surface 700.
- the smoot h exterior dome surface 700 minimizes the collection of dirt and debris on the lens when the lens 100 is used in an overhead exterior lighting or a signalling application suc h as in a traffic signal lamp or an overhead illuminated roa d sign. Only the interior surface 500 includes the optical details of the horizontal bands 300.
- the lens 1 00 of Figures 6 and 7 can be mounted over a circuit board assembly 9 as illustrated in Figures 4A and 4B in the same manner as the first embodiment.
- each of the horizontal bands 300 can include an upper region and lower region 300a, 300b as illustrated in Figures 8 and 9.
- the band 300 can include a line 150 between the upper region 300a and the lower region 300b.
- the line 150 can be an optical axis of an associated LED 11 or the LED 11 can be located behind the horizontal bands 300 but not centered behind the horizontal bands 300 as in the previous embodiment.
- the upper region 300a of Figures 8 and 9 can include a complex surface 170 which includes a first surface 170a and a generally curved second surface 170b.
- the lower region 300b can include a first part 190a which can be generally curved and a second part 190b which includes an array of vertical grooves 210 which extend from the first part 190a and expand along the entire width of each band 300.
- the vertical grooves 210 can refract some light to a desired horizontal direction.
- the first part 190a that defines a slightly curved surface permits some light from the LEDs to pass therethrough.
- the second part 190b which includes the vertical grooves 210 can direct some light from the LEDs in a horizontal direction.
- each of the horizontal bands 300' can include an upper region and lower region 300a' , 300b' .
- each of the horizontal bands 300' includes a line 150' between the upper region 300a' and the lower region 300b'.
- the line 150' can be on an optical axis of an associate LED 11 or the LEDs 11 can be located behind the horizontal bands 300 but not centered behind the horizontal bands 300 as in the previous embodiments.
- the upper region 300a' of the horizontal band 300' can include at least one complex surface 170' in the form of pointed ridges or grooves, and optionally a slightly curved surface 170''. Therefore, the upper region 300a' including the at least one complex surface 170' and the sightly curved surface 170'' noted above tends to refract light that is headed upward, downward, in precise desirable directions which are preferable for traffic signal lamps in which lighting below the horizontal axis is desired.
- the lower region 300b' of the band 300' can include a first part 190a' which defines a surface which can be a slightly curved surface, and a second part 190b' which defines an array of vertical grooves 210' which extend from the first part 190a' and span along the entire width of each band 300'.
- the vertical grooves 210' refract light to a desirable horizontal direction.
- the first part 190a' that defines a slightly curved surface permits some light from the LEDs to pass therethrough.
- the second part 190b' which includes the vertical grooves 210' can direct some light from the LEDs in a horizontal direction.
- the vertical grooves 210 or 210' like the grooves 21 of the first embodiment refract light to a desirable horizontal direction and can be seen in detail in Figure 11.
- the lens 1 of the present invention can optimize and redirect LED light in a desirable direction in order to meet, for example, ITE specifications as illustrated in the light ray diagram of Figure 2B.
- the lens l of the present invention can redirect non-parallel rays 75 from multiple LEDs.
- the lens 1 is designed to refract portions of light emitted from an LED while allowing other portions to pass through the lens unchanged.
- the redirected LED light is optimized for compliance with regulations. The same applies for the lens 100 illustrated in Figures 6 and 10.
- the LEDs 11 are arranged in rows so as to correspond with the horizontal bands 3 or 300 of the lens 1 or 100 when the lens 1 or 100 is mounted in front of the circuit board assembly 9.
- Each of the LEDs 11 has an optical axis which can be on the line 15 between the upper region and the lower region 3a, 3b of the horizontal bands 3.
- a side view of some LEDs 11 as mounted on the circuit board assembly 9 can be seen in Figure 4B.
- the lamp assembly of the present invention can utilize, for example, AlInGaP LEDs to produce the requisite amount of light. It is recognized that the amount and types of LEDs, utilized can be based on design considerations.
- the circuit can include eight strings of thirty-six LEDs each. Each string can have cross-linked connections 27 at every sixth LED. Advantages of this arrangement are that if a single LED fails open, the cross-linking will prevent all but six LEDs (2%) from shutting down. The current through each of the remaining seven string segments will increase by only 14%. This value can be sustained indefinitely. Additionally, cross-linking blocks of six LEDs reduces the amount of "current hogging" caused by variation in forward voltage of the LEDs when compared to cross-linking of single LEDs.
- the LEDs can be energized by power from a 120-volt AC line through an 8.2 ⁇ F capacitor 29 followed by a full wave bridge rectifier circuit 30 formed by four 1N4004 diodes. Current flows bi-directionally through the capacitor at every line cycle but uni-directionally through the LEDs due to the full wave rectifying action of the bridge circuit.
- the capacitor therefore acts as the series current limiting element, but instead of dissipating power, it temporarily stores it and later returns it to the line.
- a second capacitor 31 (1.0 ⁇ F, 400 VDC) can be placed across the AC line and prevents leakage currents that may be present in solid-state switches, from causing the LEDs to glow in the off-state. This capacitor also prevents conflict monitors from mistaking the LED signal for a burned-out incandescent lamp. Surge protection is provided by a bidirectional 1.5 K Joule transient voltage suppressor diode and a low resistance (2 ⁇ , 5 watt) resistor. A 2 amp fuse limits power to the assembly in the event of catastrophic failure. As noted above, the values given with respect to Figure 5 are examples and can be based on design considerations.
- the lens 1 or 100 and circuit board arrangement 9 of the present invention can provide for a combination in which the lens maximizes light efficiency emitted from a nominal amount of LEDs to meet various regulations.
- the lens can direct light vertically downward through specific angles and the grooved features of the lens which are placed on specific areas of the lens can collect otherwise extraneous light and redirect this light horizontally.
- the lens is designed to work in combination with specified LEDs to efficiently redirect light emitted from the LEDs to specific angles.
- the lamp assembly incorporates a flat wiring board which is suitable for LED insertion and the backlit lens provides an appearance of full illumination. This is advantageous with respect to the use of the lamp assembly as an overhead signaling or lighting assembly such as a traffic signal lamp or an overhead illuminated road sign.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Led Device Packages (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1015096P | 1996-01-17 | 1996-01-17 | |
US10150P | 1996-01-17 | ||
US2402896P | 1996-08-16 | 1996-08-16 | |
US24028P | 1996-08-16 | ||
US761149 | 1996-12-06 | ||
US761139 | 1996-12-06 | ||
US08/761,139 US5833355A (en) | 1996-12-06 | 1996-12-06 | Led illuminated lamp assembly |
PCT/US1997/000005 WO1997026483A1 (en) | 1996-01-17 | 1997-01-07 | An led illuminated lamp assembly |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0874964A1 true EP0874964A1 (en) | 1998-11-04 |
EP0874964A4 EP0874964A4 (en) | 2000-01-12 |
EP0874964B1 EP0874964B1 (en) | 2005-09-21 |
Family
ID=27359164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97904726A Expired - Lifetime EP0874964B1 (en) | 1996-01-17 | 1997-01-07 | An led illuminated lamp assembly |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0874964B1 (en) |
JP (1) | JP2000503431A (en) |
AT (1) | ATE305115T1 (en) |
AU (1) | AU708420B2 (en) |
BR (1) | BR9707050A (en) |
CA (1) | CA2243593C (en) |
DE (1) | DE69734234T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2578930A2 (en) | 2011-08-11 | 2013-04-10 | Hella KGaA Hueck & Co | Light module for an external light |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101112552B1 (en) | 2005-03-08 | 2012-02-15 | 삼성전자주식회사 | Lens for light emitting diode, light emitting lens, back light assembly and liquid crystal display |
EP2677235A1 (en) | 2012-06-22 | 2013-12-25 | Hella KGaA Hueck & Co | LED lamp |
WO2014023825A1 (en) * | 2012-08-10 | 2014-02-13 | Hella Kgaa Hueck & Co. | Light module for an external light |
JP6074268B2 (en) * | 2013-01-11 | 2017-02-01 | 篠原電機株式会社 | Road information display device |
KR101869270B1 (en) * | 2018-01-04 | 2018-06-21 | 김상관 | LED Traffic Signal |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0390757A2 (en) * | 1989-03-29 | 1990-10-03 | Peek Traffic Aktiebolag | Lens for traffic lights and method of making same |
-
1997
- 1997-01-07 AT AT97904726T patent/ATE305115T1/en not_active IP Right Cessation
- 1997-01-07 DE DE69734234T patent/DE69734234T2/en not_active Expired - Lifetime
- 1997-01-07 JP JP9526016A patent/JP2000503431A/en active Pending
- 1997-01-07 AU AU17445/97A patent/AU708420B2/en not_active Expired
- 1997-01-07 BR BR9707050-5A patent/BR9707050A/en not_active IP Right Cessation
- 1997-01-07 CA CA002243593A patent/CA2243593C/en not_active Expired - Lifetime
- 1997-01-07 EP EP97904726A patent/EP0874964B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0390757A2 (en) * | 1989-03-29 | 1990-10-03 | Peek Traffic Aktiebolag | Lens for traffic lights and method of making same |
Non-Patent Citations (1)
Title |
---|
See also references of WO9726483A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2578930A2 (en) | 2011-08-11 | 2013-04-10 | Hella KGaA Hueck & Co | Light module for an external light |
US9086192B2 (en) | 2011-08-11 | 2015-07-21 | Hella Kgaa Hueck & Co. | Light module having a cover with a plurality of optical systems, each optical system having a plurality of optical regions and optical elements |
Also Published As
Publication number | Publication date |
---|---|
CA2243593C (en) | 2005-03-29 |
DE69734234D1 (en) | 2006-02-02 |
EP0874964A4 (en) | 2000-01-12 |
CA2243593A1 (en) | 1997-07-24 |
EP0874964B1 (en) | 2005-09-21 |
BR9707050A (en) | 1999-12-28 |
ATE305115T1 (en) | 2005-10-15 |
AU708420B2 (en) | 1999-08-05 |
DE69734234T2 (en) | 2006-07-06 |
AU1744597A (en) | 1997-08-11 |
JP2000503431A (en) | 2000-03-21 |
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