Focus processing with the distance of different target wheels

US7248347B2 · kind B2 · utility

Assignee

• Dialog Imaging Systems Inc. · DE

Inventors

• Horst Knoedgen · Munich, DE
• Dirk Huettmann · Baltmannsweiler, DE

Key dates

• Filing date: Aug 30, 2004
• Grant date: Jul 24, 2007
• Expiry date: Aug 14, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N17/002
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An apparatus and method for automatically focusing a miniature digital camera module (MUT) is described. A MUT is loaded onto a test fixture and aligned with an optics system of a test handler. Focus targets contained within two target wheels are positioned over an optical centerline above the digital camera module using stepper motors. A field lens is positioned to focus an image of the targets onto the lens opening of the MUT. The image can be of a single target or a combination of targets contained on the target wheels at various optical distances from the MUT. A focusing unit adjusts the lens cap of the MUT for a best focus setting and after the MUT has been tested the best focus setting if physically fixed by permanently connecting the lens cap to the body of the MUT.