SIDE-EMITTING LENS FOR LED LAMP
First Claim
1. A side-emitting lens for an LED lamp, the lens having a central lens axis about which the lens is symmetrically disposed, the lens serving to redirect light generated by the LED lamp which is initially directed along the central lens axis to a direction that is substantially perpendicular to the central lens axis, the lens comprising:
- a base section having,a cavity defined by a cavity refracting surface with a substantially planar central section, which is substantially normal to the central lens axis, and a stepped cavity sidewall, anda base external refracting surface symmetrically disposed about the central lens axis and spaced apart from said stepped cavity sidewall;
an internal reflecting surface that terminates in a rim and a vertex, said internal reflecting surface being spaced apart from said cavity and symmetrically disposed about the central lens axis; and
a side surface attached to said rim and joining said base external refracting surface, said side surface being substantially parallel to the central lens axis.
1 Assignment
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Accused Products
Abstract
A side-emitting lens for use with an LED lamp provides a distribution of emitted light that is substantially normal to an axis of symmetry of the lens; the light can also be symmetrical with respect to a plane normal to the lens axis. The lens has a cavity in which the LED lamp can reside, having a cavity refracting surface with a central section and a stepped cavity sidewall. The lens also has a base external refracting surface surrounding the cavity, an internal reflecting surface spaced apart from the cavity, and a side surface; these surfaces redirect light that enters the lens through the cavity refracting surface. For many applications, the lens axis is vertical in service and the lens is configured to provide a narrow distribution of light in the horizontal plane.
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Citations
10 Claims
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1. A side-emitting lens for an LED lamp, the lens having a central lens axis about which the lens is symmetrically disposed, the lens serving to redirect light generated by the LED lamp which is initially directed along the central lens axis to a direction that is substantially perpendicular to the central lens axis, the lens comprising:
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a base section having, a cavity defined by a cavity refracting surface with a substantially planar central section, which is substantially normal to the central lens axis, and a stepped cavity sidewall, and a base external refracting surface symmetrically disposed about the central lens axis and spaced apart from said stepped cavity sidewall; an internal reflecting surface that terminates in a rim and a vertex, said internal reflecting surface being spaced apart from said cavity and symmetrically disposed about the central lens axis; and a side surface attached to said rim and joining said base external refracting surface, said side surface being substantially parallel to the central lens axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification