Method of manufacturing a lens system comprising two lens elements

Abstract

In an optical recorder and/or player the lens system of the scanning device focuses the light beam into a scanning spot on the information carrier. The lens system includes a main or objective lens and an auxiliary or solid immersion lens to provide the large numerical aperture required for scanning information carriers with a high information density, such as high-density compact discs. At least one lens, in particular the main lens, is suspended in a housing in a direction parallel to the optical axis of the lens system by two elastically deformable mounting elements. When viewed parallel to the optical axis, the mounting elements are distal from each other, and each allow tilting movements of the lens about tilt axes perpendicular to the optical axis, and are substantially undeformable in directions perpendicular to the optical axis. During manufacture of the lens system, the lenses are aligned relative to each other by shifting at least one of the mounting elements in directions perpendicular to the optical axis. The lenses may be positioned parallel to each other by shifting one of the mounting elements in a direction perpendicular to the optical axis, and centered relative to each other by shifting the non-suspended lens in a direction perpendicular to the optical axis. Thus, allowing accurate alignment of the lenses relative to each other using a simple manipulator with limited positioning possibilities.