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Gull Wing Surface Mount Optical Navigation Sensor

IP.com Disclosure Number: IPCOM000145893D
Publication Date: 2007-Jan-30
Document File: 2 page(s) / 46K

Publishing Venue

The IP.com Prior Art Database

Abstract

This paper describes a way to design an optical navigation sensor for surface mounting on a single sided printed circuit board leading to lower cost.

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Gull Wing Surface Mount Optical Navigation Sensor

Koay Ban Kuan, Bernard Chan,

Leong

Ak

Wing, Avago Technologies (M) Sdn Bhd

Abstract

This paper describes a way to design an optical navigation sensor for surface mounting on a single sided printed circuit board leading to lower cost.

Introduction

All insert molded leadframe optical navigation sensors manufactured so far are through hole products which is wave soldered on the printed circuit board (PCB), see figure 1. Through hole is limited by the hole separation on the PCB to 1.78 mm and a hole diameter of 0.7 mm if the holes are to be punched for low cost. Smaller holes separation and smaller diameters can be achieved by drilling but the PCB fabrication cost will be much higher. Therefore, these sensor products have a big foot print leading to high cost.

Figure 1

To achieve low cost many integrated circuits (IC) products were and still are designed for surface mount technology (SMT). The PCB does not need to have any holes for the lead soldering. The pads for the lead soldering can be spaced much closer, in the order of 0.5 mm. However, most SMT components are surface mounted on the top side of the PCB with the other through hole components soldered to the bottom side, see figure 2. Thus the PCB is still double sided and more expensive than single sided.

Figure 2

Concept

The sensor leads ar...