WO2007048397A1

WO2007048397A1 - Optimized isometric led reflector

Info

Publication number: WO2007048397A1
Application number: PCT/DE2006/001890
Authority: WO
Inventors: Stefan Golla
Original assignee: Stefan Golla
Priority date: 2005-10-24
Filing date: 2006-10-23
Publication date: 2007-05-03
Also published as: DE112006003547A5; DE102005052179A1

Abstract

Disclosed is a reflector which is designed for an array of point light sources [P], preferably LEDs, in an isometric grid structure, in a maximum of 3 rows, in such a way that the lateral beam components [b, c] of an LED are reflected also forward at preferably the opening angle of the direct beam [a]. Said reflector is composed of three substantial reflector areas [A, B, C] which are regularly mounted on top of each other. Areas [A] and [B] extend at an angle of 55°. Reflector area [C] is regularly curved at an angle ranging from 60° to 71°. Reflector areas [B] and [C] mainly reflect the lateral beam component [b] at the top of the luminaire. Reflector area [A] mainly reflects beam component [c] which is emitted laterally from the luminaire. Said array makes it possible to obtain an optimum between a minimum size and maximum reflection and packing density while dispensing with the need for optical lenses. The inventive reflector can be used for efficient and minimal headlights in cars, lights for bicycles, hand-held lamps and headlamps, building lights and room lights.

Description

description

DESCRIPTION OF THE INVENTION Optimized Isometric LED Reflector 1.1. motive

Conventional LED lamps are designed either with lens systems or simply in highly compact LED arrangements. However, there is no one with a reflector, the optimum between maximum LED density, best light output and directional bundling rindet. At this point my invention should remedy the situation.

1.2. known state of the art

It is known that there are LED lamps with reflectors and / or optical lenses.

An invention CA 2417760 Al has a reflector with LEDs _{5 of} an optimized

Follow arrangement, but here is the reflector in two parts, and it is the lateral component of the LED light is not used.

A patent GB 2348324 A has for each LED a single reflector, which also the lateral

Does not use share effectively.

A patent US 2004/0208019 Al provides for the use of the side portion, but not optimized and the reflector is formed in two parts as a "mushroom" and long, which increases the size of the reflector.

Patent CA 2206820 C is essentially a protected LED

Lamp housing based on optical lenses.

In the published patent application DE 10 2004007 812 Al LEDs are bound to a reflector, but this arrangement uses only the typical focus of the reflector, but does not take into account the side component.

Patent SPIS 275670 has a reflector lens system but with only one LED.

In DEPATISnet, I also found many other disclosures and patents that did not match my own or simply showed different combinations of LED arrays, but showed no sign of optimization. 1.3. invention

Optimized isometric LED reflector

Especially with bicycles with Dynamos, there is the general problem of limited power of usually only 3 watts (StVZO) for adequate lighting. The standard power consumption of ultra-white LEDs of 0 5 mm, height of about 9 mm (commercial) and currently about 10 - 12 cd (peak values up to 24 cd) is about 25 mA (at 3.3 V). A typical bicycle dynamo according to StVZO has a power output of 3 watts at load of at least 6 volts. A white LED typically requires 3.2 - 3.7 volts. Thus, enough power is available for about 40 LEDs (3.4 V).

The radiation angles of a standard LED can be divided into 4 components: • Component [a] (main part): mostly 30 ° to 10 ° opening angle to the front

(direct beam from the LED point light source, bundled by the hemispherical head [K] of the LED plexiglass body)

• Component [b]: Stray light which passes through the reflection in the LED body, which emerges from the LED at the upper end of the hemispherical head [K] at an opening angle between 120 ° and 140 °.

Component [c]: lateral scattered light which can not escape from the reflector at the point light source (about 3.5 mm above the LED bottom) to less than 20 ° (corresponds to 140 ° angle of elevation) and to the entire vertical side wall of the plexiglass body to about 50 ° (corresponds to 80 ° Öfrhungswinkel) laterally exit. The main part of it, however, exits laterally at 25 ° - 30 ° and is vertically offset by reflection in the plexiglas body [K].

• Component [d]: emerges from the LED at 50 ° backwards, resulting in all light rays reflected in the Plexiglas body, thrown backwards past the LED point source reflector. Between these components, the negligible proportion of radiation is small.

When optimizing a point light source, such as that of a standard LED, it is not absolutely necessary to reduce the already narrow opening angle of the component 80 [a], but to bring all lateral components [b] and [c] as close as possible to the opening angle to throw [a] forward through the shape of the reflector without using a lens that has transmission losses and increases in height. The back component [d] can not be considered in this construction.

In order to optimize the beam path for only one standard LED (0 5 mm) of the components [b] and [c] 85, one needs a reflection surface whose inclination to the horizontal is approximately 55 °. This angle results from the maximum slope before the reflected beam intersects the plexiglass body and the minimum angle at which the beam of the [b] and [c] component exceeds the minimum aperture angle of [a].

The initial position and length of the reflection surface [A] in frontal radiation direction [c] 90 is meaningfully limited by the, under the exit angles and beam intersection with the vertical axis of the Plexiglas body and their extension to a reflection surface as close as possible.

For example, for a 0 5 mm standard LED from the horizontal of the LED base, about 4.6 mm to 7.3 mm: reflector segment [A] and 7.3 mm - 13.6 mm: reflector segment 95 [B ], each less than 55 ° to the horizontal.

The shape of both segments [A] and [B] can be described by the discharge from the solid, perpendicular to the bottom of the reflector, centered on each line to the point light source [P], below about 55 ° by a cavity.

In order to increase the areal yield of such a reflector with a higher number of 100 point light sources, preferably standard LEDs, an isometric arrangement of point light sources is absolutely necessary. In order for component [b to comply with the following criteria: 1. The isometric array may not have more than preferably 3 rows in a particular lattice structure direction of the 105 point light source planes.

2. At each adjacent outer point light source, horizontally above the 55 ° inclination of the reflector segment [B], a segment [C] must be directly connected, which at least the component [b], the neighboring point source light source offset by one, is thrown forward.

The segments [A] and [B] are described by the discharge from the solid, from the front, by, as described above, cavities with a slope of about 55 °. In doing so, the [B] segments of each point light source intersect. The shape [Bl] of the segment [B], enclosed by the segments [A], is each continued through 3 cavities, cut up into the vertical.

115 The isometric distance from the two adjacent point light sources is the

Invention according to a maximum of 10 mm at 0 5 mm standard LEDs. Other point sources of light and their internal angles and proportions are said to be related in order to meet the specifications of the characteristics of the reflector.

However, in order to follow and minimize the size of the reflector by the size and shape optimization constraint, a schematic right outer contour of segment [C] is to be kept, except that there is a symmetrical arrangement of 6 hexagonal outside and one point light source in the middle is described by a circle [Fig. I]. If more or less than 7 point light sources, preferably LEDs, are assembled according to the arrangement described above, then at least two sides of the right-hand circle (rectangular shape with corners that are as meaningful as possible, material-saving simply rounded corners) must describe a straight line (FIG. 8 [D]). ,

The segment [C] is characterized in that it terminates preferably horizontally at the upper end. From the upper, planar, right-hand boundary line [D] with the slope to the inner segment edge line of segment [B], the reflection surface [C] 130 is descriptive, always an area in a curved shape between 2 straight lines perpendicular to the tangent of the edge segment boundary lines of the segments [B] and [C] to be led, which describes a surface inclination between about 60 ° and 71 ° to the horizontal of the ground, continuous (Fig. 9).

In this case, the point of articulation from the upper segment edge [B] to the upper segment edge [C] at the point where the point of intersection (FIG. 3 [Pl, P2]) of two cavities of the segment [B] of two point light sources is to continue below 60 °. The steepest increase of about 71 ° of the connecting line between the edge of the segment lines [B] and [C] are each centrally between the 60 ° inclined surface line, or on

140 of the location where the distance (FIG. 3 [P3]) between the upper segment edge of [B] and the outermost upper right-hand boundary line is lowest.

This angular distribution is chosen so that, despite the partial parabolic outer basic shape of segment [B], the outermost boundary line [D] of segment [C] and thus also the outer dimensions of the reflector (even at the long surfaces and curves with minimum simple radii, Fig. 9) a high packing density can be ensured in combination with other similar reflectors, as they complete straight and minimal semicircular.

Following this principle, reflectors with point light sources, preferably with standard LEDs, follow, for example:

150 • a circular reflector with only one LED (Fig. 7)

• a long-drawn reflector with straight long edges and iso-oval short sides, with LEDs that are only in a row. (Fig. 8)

• a uniformly rectangular reflector with 4 LEDs

• a completely round reflector with 6 hexagonal LEDs and a LED in the middle. 155 (shape with the maximum reflection per LED) = 7 LEDs (Fig. 2)

A right-round reflector, which, like a round reflector, is designed only with extended rows extended in each row by a uniform number of point light sources. For example: 10 LEDs (Fig. 1), 13 LEDs (Fig. 3), ... and logically following.

160 (the reflector with 10 isometric, arranged in the grid (Fig. 3) point light sources [P], is The reflection angle, by the reflector surfaces [A, Bl, B, C] forwardly reflected 165 beam components [b, c] is thus between 25 ° to 0 ° (corresponds to a Öffhungswinkel of 50 ° - 0 °, effectively 20 °).

The principle, which preferably integrates standard LED flush with the base of the reflector, guarantees the perfect alignment and mounting depth to the reflection surface and ensures optimum cooling of the LED.

170 For the use of such a reflector on the bicycle, this means that identical or different reflectors with 7, 10, 13, ... etc. can be assembled alone or in clusters of reflectors from 2-5 in order to maximize the light output win. see Attachment:

Sketch 1, 2, 3, 4, separate leaves, Fig. 1-9

175 1.4. Explanation to the drawings of sketches 1 - 4

Sketch 1

1: 3D view of a reflector with 10 point light sources, 4 reflector segments [A, B, Bl, C] and 2 beam components [b, c]

Sketch 2

180 Fig. 2: front view of a reflector with 7 point light sources, and 4

Reflector segments [A, B, Bl, C]

3: front view of a reflector with 13 point light sources, and 4 reflector segments [A, B, Bl, C], isometric grid arrangement, 3 row structure, as well as the 60 ° point of view [Pl], segment [B] cutting edge [P2] and the 185 71 ° minimum connecting line [P3]

Sketch 3

4: front view of a reflector with 10 point light sources, and 4 reflector segments [A, FIG.

B, Bl, C], cut-up planes at [P2] -> Fig. 5 and at [P3] -> Fig. 6

Fig. 5: Cold cut - view with LED in the middle in the amount of [P2], beam path of [b] Fig. 6: Cold cut-up view with two LEDs on the outside in the amount of [P3], beam path of [a, b, c], inclination of the reflector surfaces [A, B, C]

Sketch 4

Fig. 7: Cold cut - view with a LED for dependent claim 4, beam path of [b, c]

195 Fig. 8: Front view of a reflector with 5 point light sources isometric in a row, and 3 reflector segments [A, B, C]

9 shows a sketch of the right-hand reflector outer shape and the continuously curved surface tensioning of the reflector surface [C]

1.5. marketing

Owing to the empirical-mathematical optimization of the reflector, as well as the isometric arrangement and number of preferably LEDs and the omission of a lens, cheaper LED lamps can be produced which have maximum forward reflection at maximum packing density. A low load on LEDs and a large design compared to conventional LED lamps brings about 30% more light output, 05 with just as many LEDs in the reflector and thus also more visibility on the road

Bicycle lights and / or headlamps and hand and headlamps increased visibility. Due to the direct coupling and sinking of the point light sources, preferably standard LEDs, a perfect alignment as well as an optimal cooling of the LEDs can take place.

Claims

2.2. Main claim: 240 Optimized isometric LED reflector

1.

Reflector for at least 7 point light sources, preferably standard LEDs with 5 mm

Diameter, characterized in that the laterally emerging beam components

[b] and [c] are reflected from the, preferably plexiglass body [K] in the manner forward 245, so that they approximately equal to the opening angle of the direct forward emerging beam [a]. Cut from the punk light source [P] in the light source body [K], a reflection surface [A] begins at an inclination of about 55 ° to the horizontal forward, below at least 25 ° of [P], and around the reflected rays in the plexiglass body

[c] with the 55 ° reflection surface [A] again at the upper end intersects (Fig. 5). A subsequent reflection surface [B], which continuously merges with the reflection surface [A] at about the same angle of about 55 °, terminates with a segment [B] boundary line horizontally-exactly there, where a lateral radiation component [b] emerges the semicircular head of the light source body [K] emerges and cuts at a maximum of 30 ° to the horizontal (FIG. 5). A reflection surface [C], whose lower boundary line

255 continuous with the boundary line of the reflection segment [B], is under the

Angle between about 60 °, at the intersecting segment surfaces [B], and about 71 ° centered, between the intersecting 60 ° angles curved (Figure 9). The reflection segment [C] terminates horizontally-even where the beam component [b] of a directly adjacent opposite point light source at a maximum of 30 ° from the

260 emerges from the uppermost point of the luminous element [K] and intersects with the segment surface [C] (FIGS. 1, 4, 5). The topmost outermost edge shape on the reflection segment [C] describes a circle either in 7 point light sources [P] (FIG. 2) or in the case of 10, 13, 16 and, following logically, with light sources equipped with a reflector (FIGS. 1, 3, Al [D ]). The right-hand round is a shape with sides at right angles, the corners of each as far

265 are rounded, that the volume of the reflector is minimized, with at least 2

Side edges include a straight line. The continuous area of the segment [C] under the angles of 60 ° at the point of view [Pl] and 71 ° at the point of the smallest distance [P3] to the outside Segment edge tangents of segment [B] and [C] form the shortest straight line that steadily spans a surface (Figure 9).

The distance of the point light sources [P] _5, preferably LEDs, is arranged isometrically in a grid with in one direction a maximum of 3 lines such that the isometric distance

275 between two adjacent point light sources does not exceed twice the distance measured in the horizontal plane from a point light source to the outer edge of the respective reflector segment [A] projected onto the horizontal (FIG. 3). The reflector segments [A] and [B] are as below a cavity in the manner perpendicular to the bottom [Bo] of the reflector below 55 °, centered on each perpendicular line to the

280 point light source that only the reflector segments of [B] intersect midway between the abutment points [P2] of the segments of [A].

Subclaims to main claim 1 Construction and use

2. A point light source reflector, in particular standard LEDs, according to claim 1, 285 is characterized

in that the bottom of the reflector is provided with vertical counterbores such that the base of the point light source body [K] terminates flush with the bottom of the reflector [Bo], so that the installation height and positioning of the point light coincide with the geometry of the reflector. In this case, the reflector body 290 is to be executed below the reflector surfaces. The diameter of the countersink is preferably flush with the point light source body [K].

3. A point light source reflector according to at least one of claims 1 and 2, characterized

that with any choice of point light sources [P] and their body [K] in compliance with 295 of the angular dimensions, the proportions are adjusted according to the description and the claims, so that the reflector meets its requirements, in particular the size and shape change of a standard LED ,

4. A point light source reflector according to at least one of claims 1 to 3, characterized by 300 characterized

according to one of claims 1 to 3, the reflector is constructed for at least one point light source [P], with circular boundary of the segments [C] and [B] and at the same angles (Figure 7); and conclusively constructing a reflector with isometric distances, in at least one row, from a plurality of point light sources [P], 305 at the same angle and proportions according to any one of claims 1 to 3

(Fig. 8). For a reflector having only one point light source, a reflector segment [C] is not needed because there is no ray component [b] intersecting with a reflector surface [C] (Figure 7).

5. A point light source reflector according to at least one of claims 1 to 4, characterized by 310 characterized

that such a reflector preferably also for automobiles, motorcycles, wheelchairs, boats, rail vehicles, exterior and interior lighting of buildings and hand and head lamps can be used.