Light guide and printed circuit board film positioner
A light guide assembly includes a metal material printed circuit board. A light emitting diode is mounted on and extends away from a first face of the printed circuit board. A light guide molded from a light transmissive polymeric material is positioned proximate to the light emitting diode and is at least partially received in a concomitantly shaped through bore pre-formed in the printed circuit board. The light guide includes an extended feature co-molded from the same material as the light guide and extending away from the first face of the printed circuit board in an installed position of the light guide. The extended feature includes a first extended feature having a first length and a second extended feature having a second length, the second length greater than the first length.
1. A light guide and printed circuit board assembly, comprising:
a printed circuit board;
a light emitting diode mounted on a first face of the printed circuit board;
a light guide molded from a light transmissive polymeric material positioned proximate to the light emitting diode, the light guide including an extended feature, the extended feature co-molded from the same material as the light guide and extending away from the first face of the printed circuit board in an installed position of the light guide; and
a touch capacitive circuit printed on a second face of the printed circuit board oppositely directed with respect to the first face and connected to touch capacitive second electrical traces.
2. The assembly of claim 1 , wherein the extended feature of the light guide includes:
a first extended feature integrally connected to the light guide having a first length; and
a second extended feature integrally connected to the light guide having a second length, the second length greater than the first length.
3. The assembly of claim 2 , wherein:
the first extended feature is oriented parallel to and aligned with a first edge of the light guide; and
the second extended feature is oriented parallel to and aligned with a second edge of the light guide;
the first extended feature sets a thickness of an opaque polymeric material applied onto the first face of the printed circuit board after installation of the light guide.
4. The assembly of claim 1 , wherein the light guide includes a shoulder created in a first portion of the light guide, the shoulder supporting the light guide on the first face of the printed circuit board.
5. The assembly of claim 4 , wherein a second portion of the light guide is received in a concomitantly shaped through bore pre-formed in the printed circuit board.
6. The assembly of claim 1 , further including a white film applied or ink printed over the light guide.
7. The assembly of claim 1 , further including:
a touch capacitive sensor connected to the touch capacitive circuit; and
a window region unobstructed by direct through-passage of the electrical traces maintained through the printed circuit board proximate to the touch capacitive sensor.
8. The assembly of claim 7 , further including a polymeric substantially opaque film applied to the second face including onto the touch capacitive circuit, the second electrical traces, and the touch capacitive sensor, wherein light generated by the light emitting diode is blocked from passing through the opaque film except at a location of an indicia defining a light transparent portion of the opaque film.
9. The assembly of claim 1 , wherein the light guide includes a texturally modified area proximate to the light emitting diode defining a light reflector to locally reflect light generated by the light emitting diode.