Browse Prior Art Database

Integrated Lens for Reverse Mount LED

IP.com Disclosure Number: IPCOM000176012D
Publication Date: 2008-Oct-31
Document File: 3 page(s) / 35K

Publishing Venue

The IP.com Prior Art Database

Related People

Tony tong: INVENTOR

Abstract

A reverse mount LED solders onto the bottom side of a printed circuit board, and fires or shines through the PCB and up to the top side. This invention describes relatively methods to integrate light-spreading lens features in the PCB, in order to increase and brighten the illuminated area.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Integrated Lens for Reverse Mount LED Tony Tong

Integrated Lens for Reverse Mount LED

1. Inventor(s): Tony Tong
2. Synaptics Incorporated, Santa Clara, CA, USA

3. Short Summary

A reverse mount LED solders onto the bottom side of a printed circuit board, and fires or shines through the PCB and up to the top side. This invention describes relatively methods to integrate light-spreading lens features in the PCB, in order to increase and brighten the illuminated area.

Figure 1: Cross-sectional view of countersink hole used as an integrated lens in printed circuit

board for reverse mount LED.

4. Some Problems Solved

Examples of some of the problems addressed by the invention include:

Illuminate a larger area (e.g., a graphical icon) for reverse mount LED designs. In some cases, create a brighter output from the reverse mount LED.

Copyright © 2008 Synaptics Incorporated, All Rights Reserved. Page: 1 of 3 Information contained in this publication is provided as-is, with no express or implied warranties, including any warranty of merchantability, fitness for any particular purpose, or non-infringement. Synaptics Incorporated assumes no liability whatsoever for any use of the information contained herein, including any liability for intellectual property infringement. This publication conveys no express or implied licenses to any intellectual property rights belonging to Synaptics or any other party. Synaptics may, from time to time and at its sole option, update the information contained herein without notice.

[This page contains 1 picture or other non-text object]

Page 2 of 3

Integrated Lens for Reverse Mount LED Tony Tong

5. General Description

Reverse mount LED's are used commonly for multimedia products, touchpads and peripherals. A capacitive sensing button on a PCB copper feature is mounted under plastic. In order to light a graphical icon on the top plastic, a hole is drilled in the PCB, a reverse mounted LED is soldered on the bottom side of the PCB. When lit, the LED shines through the PCB hole and through the plastic.

Figure 2. Typical drilled thru-holes for reverse mount LED.

By drilling a hole and countersinking the PCB from the top side, the LED may still be mounted and soldered properly, but the spread of light can be as much as two or three times larger than the original diameter of a standard thru-hole.

Figure 3. Countersink hole to increase light spread.

Countersink ho...

Processing...
Loading...