Patent Description:
Different applications may require different light distribution patterns. To this end, it is desirable for LEDs to be paired with the appropriate light fixture when used for indoor or outdoor lighting. For example, some lighting applications may desire light emissions that are more broadly spread than others. It is known from <CIT> to punch individual bendable lead frames from a sheet. It is known from <CIT>, from <CIT> and from <CIT> to mount LEDs on a substrate which can be bent into a shape so that the substrate with its LEDs can be more optimally arranged inside a light fixture.

The invention is defined by the claimed illumination source and by the claimed method of fabricating a flexible printed circuit board for such an illumination source.

Like reference characters shown in the figures designate the same parts in the various embodiments.

The following description and the drawings sufficiently illustrate specific embodiments to enable those skilled in the art to practice them. Embodiments set forth in the claims encompass all available equivalents of those claims. According to aspects of the disclosure, a flexible printed circuit board, method of fabricating the flexible printed circuit board, illumination device (or light fixture) using of the flexible printed circuit board, electronics of the illumination device, and method of using the flexible printed circuit board to control illumination device, among others, are described. For example, in some embodiments, the flexible printed circuit board contains a substantially rectangular body having a plurality of segments. Each segment has a plurality of body contacts to which a light source, such as an LED, or set of light sources (also referred to as a bank of light sources) is attached. Flexible legs extend substantially perpendicularly from the body, one flexible leg extending from each segment. Each flexible leg contains at least one pair of leg contacts disposed proximate to a distal end of the leg from the body. The flexible printed circuit board is formed from a multilayer structure that comprises an adhesive layer configured to adhere the structure to a material contacting the adhesive layer, at least one pair of dielectric and metal layers, with one of the dielectric layers adjacent to the adhesive layer. Exposed portions of the metal layer through the dielectric layer form the leg contacts, and exposed portions of the metal layer through an overlying solder mask layer form the pair of body contacts.

The flexible printed board may be incorporated in a light fixture. The light fixture may include a light guide having an interior opening that defines an interior edge of the light guide. The light guide may be planar, and thus be formed as a light guide plate. An illumination source is inserted in the interior opening and includes a plurality of LEDs that are arranged to inject light into the light guide through the interior edge of the light guide. The LEDs are arranged around the circumference of a base that is part of the illumination source. The base may be thermally conductive. Equally, the base may be coupled to a heat-dissipating element that is disposed over the light guide. The heat-dissipating element may be arranged to receive heat generated by the LEDs via the thermally conductive base and dissipate the received heat.

Various types of light guides can be used to address different types of applications. Flat light guide panels may be used to cover applications ranging from intermediate batwings (typically ~<NUM>-<NUM> degree beam angle) to concentrated lambertians for some outdoor (parking garages) and indoor (downlights) applications. Flat + chamfered outer edge light guide panels may be used for similar applications, but with higher efficiency targets and less cost constrained, can be used too. This geometry can also be used for spots applications. Wedge light guide panels may be used for applications demanding batwing light distributions with high beam angles (> <NUM> degrees) and high optical efficiency, such as for bollards or street lighting. The light guide panel may have a main flat surface facing the backside of the light engine to achieve good mechanical support and rigidity. The flat surface (or both surfaces in some cases) can include additional light extracting elements (such as ink dot patterns or 3D textures or also the electrically-controllable inks already proposed in a previous ID) to provide increased performance for light output, or added dynamic control of light distributions, or simply for light extraction from the flat light guide panels or for additional emitting surface uniformity purpose. The center hole from which light is injected can also be shaped circularly or be multifaceted (octagon for instance to match the number of LEDs or angular segments) to tune the light distribution as well. Planar facets allow to generate more concentrated beams in the horizontal planes. The outer light guide panel edge can also include a reflective layer (white or mirror tape, or white glue, or clear glue + white reflective or mirror film) to recycle the light that otherwise would escape and likely get absorbed in the housing.

Examples of different light fixtures are described more fully hereinafter with reference to the accompanying drawings. These examples are not mutually exclusive, and features found in one example can be combined with features found in one or more other examples to achieve additional implementations.

It will be understood that when an element such as a layer, region or substrate is referred to as being "on" or extending "onto" another element, it can be directly on or extend directly onto the other element or intervening elements may also be present. It will be understood that these terms are intended to encompass different orientations of the element in addition to any orientation depicted in the figures.

Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element, layer or region to another element, layer or region as illustrated in the figures.

<FIG> are diagrams of an example of a flexible printed circuit board, according to aspects of the disclosure. In particular, <FIG> is a top view of the flexible printed circuit board <NUM>. The flexible printed circuit board <NUM> includes a body <NUM> and one or more legs <NUM>. As shown, the flexible printed circuit board <NUM> contains multiple legs <NUM>. The body <NUM> is substantially rectangular and the legs <NUM> extend substantially perpendicularly from the body <NUM>.

The body <NUM> includes one or more segments <NUM> associated with a set of pairs of body contacts <NUM>. Each pair of body contacts <NUM> is used to provide electrical connection to a different light source <NUM> mounted thereon (or otherwise attached thereto). Each set of pairs of body contacts <NUM> includes a single pair of body contacts <NUM> or multiple pairs of body contacts <NUM>. Different segments <NUM> may contain the same number of pairs of body contacts <NUM>, as shown, or one or more of the segments <NUM> may contain a different number of pairs of body contacts <NUM> from at least one other segment <NUM>.

The set of light sources <NUM> within a particular segment <NUM> may be the same color or one or more of the light sources <NUM> within the segment <NUM> may be different colors. Similarly, in some embodiments, each segment <NUM> may contain a set of light sources <NUM> having the same color or set of colors. In other embodiments, one or more of the colors may be different in different segments <NUM>. In some embodiments, each set of light sources <NUM> (the light sources <NUM> of a segment <NUM>) may be independently controllable. In further embodiments, each light source <NUM> within the set of light sources <NUM> may be independently controllable via the body contacts <NUM> connected to each light source <NUM>. In some embodiments, one or more of the segments <NUM> may not contain any light sources <NUM>.

As shown in <FIG>, each of the legs <NUM> includes electrical connections, shown as leg contacts 104a, that are disposed at a distal end thereof. The leg contacts 104a of each leg are used to control the set of light sources <NUM> in a different one of the segments <NUM>. Thus, in the embodiment shown in <FIG>, multiple light sources <NUM> of a particular segment <NUM> are controlled by a single pair of leg contacts 104a associated with the segment <NUM>. As shown, test contacts on each leg <NUM> may be disposed between the body <NUM> and the leg contacts 104a. The test contacts may be used during testing of the flexible printed circuit board <NUM>, either to test the connectivity between the leg contacts 104a and the body contacts <NUM> or connectivity to the set of light sources <NUM>. To control the light sources <NUM>, each leg <NUM> includes electrical connections and/or wiring to activate/deactivate one or more of the light sources <NUM> in the associated segment <NUM>, change the brightness of one or more of the light sources <NUM> in the associated segment <NUM>, change the color of light output of in the associated segment <NUM>, and/or control other characteristics of the operation of the one or more of the light sources <NUM> in the associated segment <NUM>. The set of light sources <NUM> in each segment <NUM> may be connected to one another in series, in parallel, and/or in any other suitable way. As above, the set of light sources <NUM> in each segment <NUM> may be configured to output the same color of light or different colors of light such as, for example, red, green, and blue. Additionally or alternatively, the set of light sources <NUM> in each of the segments <NUM> may output light having the same correlated color temperature (CCT). Additionally or alternatively, the light outputs of at least two of the light sources <NUM> in a segment <NUM> may have different CCTs.

<FIG> is a cross-sectional view of the flexible printed circuit board of <FIG>, according to aspects of the disclosure, while <FIG> is a flowchart of a method of fabricating the flexible printed circuit board of <FIG>, according to aspects of the disclosure. The flexible printed circuit board <NUM> may be a multilayer structure that contains at least one pair of metal and dielectric layers <NUM>, <NUM> and a solder mask <NUM> on a topmost metal layer <NUM>. A pressure-sensitive adhesive (PSA) <NUM> may be attached to the underside of a portion of the dielectric layer <NUM>. The PSA <NUM> is a non reactive adhesive that forms a bond when pressure is applied without the use of a solvent, water, or heat. The PSA <NUM> may be between about <NUM> and <NUM>, but is typically around <NUM>. The dielectric layer <NUM> may be formed from polyimide, or any other suitable insulating material that is sufficiently flexible when of the desired thickness. The dielectric layer <NUM> may be between about <NUM> and <NUM> , sufficient to support the metal layer <NUM>. As shown in <FIG>, the metal layer <NUM> may be formed on the dielectric layer <NUM> at operation <NUM>. In different embodiments, the metal layer <NUM> may be deposited or plated on the dielectric layer <NUM>. The metal layer <NUM> may be formed from copper, or any other suitable conductive material. The metal layer <NUM> may be between about <NUM> and <NUM> , nominally <NUM> or so.

In some embodiments, after formation of the metal layer <NUM> on the dielectric layer <NUM>, leg contacts are formed at operation <NUM>. In some embodiments, portions of the dielectric layer <NUM> may be removed by etching or other chemical or mechanical process to permit contact to the metal layer <NUM> at the appropriate location. In other embodiments, the portions of the dielectric layer <NUM> may not be removed. If a multilayer structure is used (operation <NUM>) and the metal layer is not the final metal layer (operation <NUM>), a new dielectric layer may be deposited or otherwise formed on underlying the metal layer at operation <NUM>. The process may then return to operation <NUM>.

If a multilayer structure is not used (operation <NUM>) or the metal layer is the final metal layer (operation <NUM>), the solder mask <NUM> may be deposited on the topmost metal layer <NUM> at operation <NUM>. The solder mask <NUM> may be between about <NUM> and <NUM>. The solder mask <NUM>, when applied, may have openings to expose portions of the topmost metal layer <NUM> to form the body contacts. The solder mask <NUM> may also have openings to expose portions of the topmost metal layer <NUM> to form the leg contacts, if not formed in the dielectric layer <NUM>. In other embodiments, the openings in the solder mask <NUM> may be formed after application of the solder mask <NUM>. The LEDs or other light sources may then be soldered or affixed to the solder mask <NUM>. The PSA <NUM> may be applied at any point during the process shown in <FIG>, such as before the light sources are attached or before the solder mask is applied. The PSA <NUM> may be applied to areas to which the multilayer structure is attached, or at least areas other than the leg contacts.

<FIG> is a planar top-down view of a solder mask layer of the flexible printed circuit board of <FIG>, according to aspects of the disclosure. As shown in <FIG>, the solder mask <NUM> has openings for both the body and leg contacts. <FIG> is a planar top-down view of a metal layer of the flexible printed circuit board of <FIG>, according to aspects of the disclosure. As above, the metal layer <NUM> may be formed from copper, or any other suitable conductive material. As shown, the metal layer <NUM> is split into individual connections. The portion of the metal layer <NUM> corresponding to the leg <NUM> is split into two sections, each connected to a different body contact <NUM> of the body <NUM>. The portion of the metal layer <NUM> corresponding to the body <NUM> is further split into multiple sections. Each section of the metal layer <NUM> is electrically isolated from each other section of the metal layer <NUM>. The sections as shown in <FIG> are configured such that the set of light sources <NUM> in a segment <NUM> are series connected, with one of the pairs of body contacts <NUM> being electrically connected to another of the pairs of body contacts <NUM>. In other embodiments, however, one or more of the light sources <NUM> in the set of light sources <NUM> may be independently addressable using the metal layer <NUM> via additional sections of the metal layer <NUM> or using a different (underlying) metal layer.

<FIG> is a planar top-down view of a dielectric layer of the flexible printed circuit board of <FIG>, according to aspects of the disclosure. The dielectric layer <NUM> may, as above, be formed from polyimide. <FIG> is a planar top-down view of an adhesive layer of the flexible printed circuit board of <FIG>, according to aspects of the disclosure. As above, portions of the PSA <NUM> may be removed prior to adhesion to the dielectric layer <NUM> and/or surface to which the structure is attached. Although multiple pairs of body contacts are described as being associated with a single pair of leg contacts, multiple pairs of leg contacts may be used, e.g., one pair for each color LED if multiple LED colors are present within the LED segment. In addition, although pairs of contacts are described, in some embodiments, more than two contacts may be used (e.g., the LED or other light source may use more than two contacts).

<FIG> show diagrams of an example illumination source according to aspects of the disclosure. In particular, <FIG> is a perspective view of an example of an illumination source utilizing the flexible printed circuit board of <FIG>, <FIG> is a planar top-down view of the illumination source of <FIG>, <FIG> is a side view of the illumination source of <FIG> and <FIG> is a perspective bottom-up view of the illumination source of <FIG>. The flexible printed circuit board <NUM> is shown in <FIG>, as is a base <NUM> (also referred to as a core) to which the flexible printed circuit board <NUM> is attached.

As shown in <FIG>, the base <NUM> contains multiple sides <NUM> and a opening or opening <NUM> in the center of the base <NUM> that extends between the top and bottom surfaces of the base <NUM>. As shown, the base <NUM> may be formed in an octagonal shape, although in other embodiments, the base <NUM> may be formed in a hexagonal, pentagonal, square or triangular shape, among others. The base <NUM> may thus have a round cross-section or a cross-section that is shaped as another type of polygon (e.g., a rectangle, a hexagon, a decagon, etc.). The legs <NUM> of flexible printed circuit board <NUM> may be routed around a bottom edge <NUM> of the base <NUM>, along the bottom of the base <NUM>, and into the opening <NUM> at the bottom of the base <NUM> as shown more clearly in <FIG>. In some embodiments, the legs <NUM> may extend into the opening <NUM> without coming out of the top of the base <NUM>. As shown in the embodiment of <FIG>, the legs <NUM> extend entirely through the opening <NUM>, to come out above the base <NUM>. In some embodiments, the legs <NUM> may be attached to the inner sides of the opening <NUM> using the PSA, although in other embodiments, the legs <NUM> may not be attached to the inner sides of the opening <NUM>. As shown in <FIG>, the legs <NUM> may be bent such that terminal portions of the legs <NUM> (which contain the leg contacts 104a) may be parallel to the top surface of the base <NUM>. As shown, the bent portions of the legs <NUM> may extend from the edge of the opening <NUM> farther radially outward than the sides <NUM> of the base <NUM>, or the set of light sources <NUM> of the segment <NUM>. In other embodiments, the body <NUM> may be attached to the inner wall of the base <NUM>. In this case, the legs <NUM> of flexible printed circuit board <NUM> may be bent to extend transverse to the outer wall of the base <NUM>.

Although in the present example the base <NUM> includes one or more LEDs <NUM> on each of its sides <NUM>, alternative implementations are possible in which at least one of the sides <NUM> does not have any LEDs mounted thereon. For example, in instances in which the base <NUM> is rail-shaped or has a rectangular cross-section, there may be LEDs disposed on only one or two of the sides. In some implementations, the base <NUM> of the illumination source <NUM> may be formed of metal or other heat dissipating material, and it may be configured to lead heat away from the flexible printed circuit board <NUM>.

<FIG> shows an exploded view of an example of a light fixture <NUM> that utilizes the illumination source <NUM>, according to aspects of the disclosure. The light fixture <NUM> may include, among others, a light guide <NUM> and a reflector <NUM> disposed over the light guide <NUM>. The reflector <NUM> described in the various embodiments herein may be placed at the back of the light guide panel to reflect downwards the light that otherwise would be directed upwards. The specularity and diffusivity properties of the reflector <NUM> can be tuned to broaden the light distributions in both vertical and horizontal planes. Although the various light fixtures <NUM> show the reflector <NUM> as having a cylindrical shape with a substantially rectangular cross-section, like the other elements being formed in a shape circular or multi-sided (e.g., octangular) shape, the various aspects are not so limited. For example, the reflector may extend over the outer edge of the light guide and have a frustoconical shape. The frustoconical shape has a trapezoidal cross-section. The underlying light guide may retain the same frustoconical shape.

In some embodiments, the light fixture may include further elements, such as a diffuser disposed under the light guide <NUM>, to diffuse light directed out from the light guide to an external environment. Although in the present example the light guide <NUM> is shaped as a disk having an interior opening (e.g., an opening in the middle of the disk or at another location), alternative implementations are possible in which the light guide <NUM> has a different shape. For example, the light guide <NUM> may be shaped as a rectangle or another polygon (e.g., octagon, hexagon, etc.), a rail, etc. The shape may be determined based on any applicable reason such as light distribution preference, physical space requirements, or the like. A light distribution preference may be based on an application of a light fixture, an environmental conduction (e.g., objects to illuminate, distance to illuminate, available ambient light, etc.), or a user input. It should be noted that although one or more specific light guide shapes are shown in the figures contained herein, the shape of a light guide may be adjusted to be any applicable shape that results in a desired light distribution.

The illumination source <NUM> may be connected to a PCB structure containing one or more control boards, such as printed circuit board (PCB) <NUM> for controlling the operation of the LEDs. As illustrated in <FIG>, the PCB <NUM> may be situated above the base <NUM>. In addition, a secondary control board <NUM> (or daughterboard) may be situated above the PCB <NUM> (or motherboard). The secondary control board <NUM> contain communication electronics through which a user device is able to wirelessly communicate lighting settings to set the lighting of the illumination source <NUM> via the PCB <NUM> and the secondary control board <NUM>. As different protocols (e.g., WiFi, Bluetooth, Zigbee) may be used, and the secondary control board <NUM> may only support a single protocol, the secondary control board <NUM> may be removable (swappable) to change the protocol used to communicate the information from the user device. The secondary control board <NUM> may also communicate information to the user device, such as present lighting conditions, available lighting conditions, and error messages. The PCB <NUM> and the secondary control board <NUM> may be protected by a removable cover <NUM> formed from an opaque material, such as metal or plastic.

<FIG> show the light guide <NUM> in further detail, in accordance with one particular implementation. <FIG> shows a vertical cross-section of the light guide <NUM> and <FIG> shows a top view of the light guide <NUM>. As illustrated, in some implementations, the sidewalls <NUM> of the opening <NUM> of the light guide <NUM> may have one or more grooves (or indentations) <NUM> formed thereon. The sidewalls <NUM> may define an interior edge of the light guide <NUM> that faces the illumination source <NUM> when the illumination source <NUM> is at least partially disposed in the opening <NUM>. The grooves may have any suitable shape, such as a circular shape, linear shape, a curved shape, etc. In the present example, the grooves <NUM> may be vertical, and they may have a linear shape that extends fully or partially between the top and bottom surfaces of the light guide <NUM>. Additionally or alternatively, in some implementations, the grooves <NUM> may be horizontal, and they may have a linear shape that extends fully or partially around the circumference of the opening <NUM> of the light guide <NUM>. The grooves <NUM> may have any suitable type of depth. In some implementations, the grooves <NUM> may be less than <NUM> deep. Additionally or alternatively, in some implementations, the grooves <NUM> may be less than <NUM> deep. Additionally or alternatively, in some implementations, the grooves <NUM> may be less than <NUM> deep. Additionally or alternatively, in some implementations, the grooves <NUM> may be less than <NUM> deep. Additionally or alternatively, in some implementations, the grooves <NUM> may be less than <NUM> deep. Additionally or alternatively, in some implementations, the grooves <NUM> may be less than <NUM> deep. Additionally or alternatively, in some implementations, the grooves <NUM> may be less than <NUM> deep, etc. Although in the present example the grooves <NUM> are formed on the interior edge of the light guide <NUM>, alternative implementations are possible in which the same or similar groves are formed on the outer edge <NUM> of the light guide <NUM>. In such instances, there may be additional LEDs that are optically coupled to the outer edge <NUM> of the light guide <NUM>.

Although the light guide <NUM> has a flat surface in the example of <FIG>, alternative implementations are possible in which the light guide has a recess formed in its surface. Furthermore, alternative implementations are possible in which the light guide <NUM> is tapered and or chamfered. Notably, the present disclosure is not limited to a specific configuration of the light guide <NUM>.

As shown in <FIG>, the illumination source <NUM> may be coupled to a mounting post <NUM>. In some implementations, the illumination source <NUM> may be disposed at least partially inside the opening <NUM> in the light guide <NUM>, as shown in <FIG>, such that light emitted from the illumination source <NUM> is injected into the light guide <NUM> through the opening's sidewalls <NUM> of <FIG> (e.g., the interior edge of the light guide <NUM>). A reflector <NUM> may be disposed under the illumination source <NUM>, as shown. As illustrated, in some implementations, the reflector <NUM> may be ring-shaped. In some implementations, the reflector <NUM> may have an inner diameter D1 that is smaller than the inner diameter Δ1 of the illumination source <NUM>, as shown in <FIG>. Additionally or alternatively, the reflector <NUM> may have an outer diameter that is greater than the outer diameter Δ2 of the illumination source <NUM>, as shown in <FIG>. Dimensioning the reflector <NUM> in this way may ensure a complete overlap between the illumination source <NUM> and the reflector <NUM>, such that all, or a large portion, of light that is emitted by the illumination source <NUM> towards the reflector <NUM>, without being injected into the light guide <NUM>, is reflected back to be injected into the light guide <NUM> through the interior edge of the light guide.

In some implementations, as shown in <FIG>, a cap <NUM> may be disposed under the light guide <NUM> and the reflector <NUM>. The cap <NUM> may be formed of plastic, metal, and/or any other suitable type of material. In some implementations, the cap <NUM> may be formed of a reflective material, such that the surface of the cap <NUM> that faces the illumination source <NUM> is configured to reflect at least some of the light emitted from the illumination source <NUM> back towards the light guide <NUM>. Additionally or alternatively, in some implementations, the cap <NUM> may be light transmissive (e.g., transparent or translucent). Additionally or alternatively, in some implementations, the cap <NUM> may be opaque.

In the example shown in <FIG>, the opening <NUM> in the light guide <NUM> is a through-hole. However, alternative implementations are possible in which the opening is a blind hole. In such implementations, the reflector <NUM> and the cap <NUM> may be altogether omitted, while the illumination source <NUM> remains at least partially disposed inside the blind hole.

In some implementations, a heat dissipating element such as a housing/pan/heat spreading element <NUM> may be disposed above the illumination source <NUM>, as shown. The pan <NUM> may be formed of metal and/or any other suitable type of thermally conductive material. In some implementations, the pan <NUM> may be thermally coupled to the base <NUM> of the illumination source <NUM>. In such instances, heat that is generated by the LEDs on the illumination source <NUM> may be led away from the LEDs by the base <NUM> of the illumination source <NUM>, into the pan <NUM>, to be subsequently dissipated by the pan <NUM>. In some implementations, the pan <NUM> may have an interior opening to allow the legs <NUM> of the flexible printed circuit board <NUM> (which is part of the illumination source <NUM>) to be routed through the pan <NUM> and connected to circuitry, such as the PCB <NUM>, that is overlying the pan <NUM>. The pan <NUM> thus may form the back of the light engine <NUM>, provide mechanical protection, and spread the heat generated by the LEDs <NUM> for good thermal dissipation since the pan may be contact with a center rod (shown below). The outer edge of the pan <NUM> may be used to shape optimally as the outer edge may significantly impact the overall photometric performance, mechanical protection, cosmetic aspect, and also ingress protection. If the light engine is not highly mechanical robust, and thermal dissipative is not too high, the reflector may be used as the housing.

In some implementations, the PCB <NUM> disposed over the pan <NUM> may include circuitry for individually addressing/controlling the operation of the LEDs or sets of the LEDs in the illumination source <NUM>. The circuitry may be configured to control each segment <NUM> in the illumination source <NUM> independently of the remaining segments and/or each LED within the segment independently of each other LED within the segment. For example, each segment <NUM> may be turned on/off independently of the rest as a result of this arrangement. Additionally or alternatively, in some implementations, the brightness of each segment <NUM> may be changed independently of the rest as a result of this arrangement. Additionally or alternatively, in some implementations, the color of light output by each of the segments <NUM> may be changed independently of the rest as a result of this arrangement. Additionally or alternatively, in some implementations, the CCT of light output by each of the segments <NUM> may be changed independently of the rest as a result of this arrangement.

Although the examples presented throughout the disclosure are presented in the context of light emitting diodes, it will be understood that any other suitable type of light source can be used instead.

Claim 1:
An illumination source (<NUM>) comprising a base (<NUM>) and a flexible printed circuit board (<NUM>) adapted for attachment to the base (<NUM>), wherein
the base (<NUM>) comprises multiple sides (<NUM>) and a central opening (<NUM>) that extends between top and bottom surfaces of the base (<NUM>);
the flexible printed circuit board (<NUM>) comprises
- a flexible body (<NUM>), which is substantially rectangular, comprising a plurality of segments (<NUM>),
each segment (<NUM>) comprising a set of pairs of body contacts (<NUM>) that are electrically isolated from the body contacts (<NUM>) of each other segment (<NUM>), wherein each pair of body contacts (<NUM>) provides electrical connection to an LED (<NUM>) mounted thereon; and
- a plurality of flexible legs (<NUM>) extending substantially perpendicularly from the flexible body (<NUM>), each flexible leg (<NUM>):
extending from a respective segment (<NUM>) of the plurality of segments (<NUM>), and comprising a pair of leg contacts (104a) disposed proximate to a distal end of the flexible leg (<NUM>) from the flexible body (<NUM>), each leg contact (104a) connected with a different body contact (<NUM>) of the respective segment (<NUM>), and each flexible leg (<NUM>) (<NUM>) of the flexible printed circuit board (<NUM>) adapted to be routed around a bottom edge (<NUM>) of the base (<NUM>), along the bottom surface of the base (<NUM>), and into the central opening (<NUM>).