Wide angle optical system for LED array

摘要

An optical system includes a lens and reflector configured to form a wide angle beam from light emitted from an array of LEDs by modifying only the component of emitted light that diverges from a reference plane. A central portion of the lens collimates emitted LED light relative to the reference plane containing the optical axes of the LEDs. A peripheral portion of the lens re-directs emitted LED light into an orientation perpendicular to the reference plane. The reflector surrounds the periphery of the lens and re-directs light from the peripheral portion of the lens into a direction parallel with the reference plane. The linear array of LEDs may include sub arrays projecting away from a support plane to enhance visibility of a resulting light signal from vantage points close to or aligned with the support plane.

主权项

1. An LED light assembly configured for mounting to a substantially vertical surface comprising:
a base included in a first plane parallel to said vertical surface; a first support included in a third plane divergent from said first plane, said first support including a heat sink and a PC board to which are mounted a first plurality of LEDs, said first plurality of LEDs arranged along a first linear focal axis parallel with said first support and included in a second plane perpendicular to said first support, each of said first plurality of LEDs emitting light in a hemispherical pattern directed away from said first support, each of said LEDs having an optical axis in said second plane and perpendicular to said third plane; a first optical element arranged to collect light from said first plurality of LEDs and having a first longitudinal axis aligned with said first linear focal axis, said first optical element comprising first, second, and third light entry surfaces and first, second, and third light emission surfaces, said first and second light entry surfaces and said first and second light emission surfaces separated by said second plane and said third light entry surface and said third light emission surface are bisected by said second plane, said first and second light entry surfaces configured to cooperate with said first and second light emission surfaces, respectively, to re-direct light emitted from said first plurality of LEDs into a trajectory substantially parallel with said third plane, and said third light entry surface cooperates with said third light emission surface to re-direct light emitted from said first plurality of LEDs into a trajectory substantially parallel with said second plane; a first reflector having first and second reflecting surfaces aligned with said first linear focal axis and arranged to reflect light emitted from said first and second light emission surfaces, respectively, into a trajectory substantially parallel with said second plane, said first and second reflecting surfaces separated by said second plane and spaced apart from said first and second light emission surfaces; a second support parallel to said first plane, said second support including a heat sink and a PC board to which are mounted a second plurality of LEDs, said second plurality of LEDs arranged along a second linear focal axis parallel with said support and included in the second plane perpendicular to said second support, each of said plurality of LEDs emitting light in a hemispherical pattern directed away from said second support, each of said LEDs having an optical axis in said second plane and perpendicular to said first plane; a second optical element arranged to collect light from said second plurality of LEDs and having a second longitudinal axis aligned with said second linear focal axis, said second optical element comprising fourth, fifth, and sixth light entry surfaces and fourth, fifth, and sixth light emission surfaces, said fourth and fifth light entry surfaces and said fourth and fifth light emission surfaces separated by said second plane and said sixth light entry surface and said sixth light emission surface bisected by said second plane, said fourth and fifth light entry surfaces configured to cooperate with said fourth and fifth light emission surfaces, respectively, to re-direct light emitted from said second plurality of LEDs into a trajectory substantially parallel with said first plane, and said sixth light entry surface cooperates with said sixth light emission surface to re-direct light emitted from said second plurality of LEDs into a trajectory substantially parallel with said second plane; and a second reflector having third and fourth reflecting surfaces aligned with said second linear focal axis and arranged to reflect light emitted from said fourth and fifth light emission surfaces, respectively, into a trajectory substantially parallel with said second plane, said fourth and fifth reflecting surfaces separated by said second plane and spaced apart from said fourth and fifth reflecting surfaces; wherein said first, second, and third light entry surfaces and said first, second and third light emission surfaces are defined by a first cross sectional shape of said first optical element projected along said first linear focal axis and said fourth, fifth, and sixth light entry surfaces and said fourth, fifth, and sixth light emission surfaces are defined by a second cross sectional shape of said second optical element projected along said second linear focal axis.