Flexible directional vehicle warning light
Disclosed is a directional warning light designed to bend along its longitudinal axis up to about 30° per side so as to conform to curved vehicle surfaces. Flexible components of the disclosed embodiments allow the bending and include a bendable optic, bendable base, and bendable circuit substrate.
1 . A flexible optic for a directional vehicle warning light, comprising:
a unitary, bendable body formed from a transparent or translucent flexible material, the body defining a longitudinal axis;
a plurality of optical elements distributed along the longitudinal axis, each optical element configured to direct light emitted from a corresponding light-emitting diode (LED) along an optical axis of the element, such that combined emissions from the optical elements produce directional illumination; and
relief sections transverse to the longitudinal axis that are located between the plurality of optical elements in the unitary, bendable body, and in which the optical elements include tapered portions configured to provide total internal reflection (TIR) for facilitating the directional illumination.
2 . The flexible optic of claim 1 , in which the flexible material comprises silicone.
3 . The flexible optic of claim 1 , in which the optic is configured to bend up to 30 degrees per side relative to the longitudinal axis.
4 . The flexible optic of claim 1 , in which the relief sections include flex joints, the flex joints facilitating bending of the flexible optic along the longitudinal axis.
5 . The flexible optic of claim 1 , in which each optical element comprises an inner reflective surface configured to direct light through an outer surface of the optic along the optical axis of the element.
6 . The flexible optic of claim 1 , in which the directional illumination maintains a minimum optical intensity of 800 candela at its midpoint when the optic is in its curved state.
7 . The flexible optic of claim 1 , in which the optic satisfies SAE J845 Class 1 light intensity requirements when curved or flat.
8 . The flexible optic of claim 1 , in which the optic is configured to sealably mate with a backing to inhibit ingress of dust and water.
9 . The flexible optic of claim 1 , in which the optic maintains the directional illumination with a reduction in optical intensity at the midpoint of no more than about 20% when transitioning from a flat to a curved state.
10 . The flexible optic of claim 1 , in which the optic includes alignment features to ensure precise positioning of the optical elements over corresponding light-emitting diodes.
11 . The flexible optic of claim 1 , in which the optical elements are elongated along the longitudinal axis and shorter in a transverse direction.
12 . The flexible optic of claim 1 , in which the optic includes external indentations along its outer surface to facilitate bending at predetermined locations.
13 . The flexible optic of claim 1 , in which the optic is configured for use with light-emitting diodes capable of producing dual-color illumination patterns.
14 . The flexible optic of claim 1 , in which the optic comprises six optical elements distributed along the longitudinal axis.
15 . The flexible optic of claim 14 , in which the six optical elements collectively produce a directional light beam that complies with SAE J845 Class 1 light output requirements.
16 . The flexible optic of claim 1 , in which each optical element is capped by a flexible membrane.