3m Innovative Properties Company

Koninklijke Philips Corporation N.v.

Michael B Larson

Jacob Moskovich

Richard J Wessling

Stephen Magocs

Daniel Meiser

E Gregory Fulkerson

David M Snively

Robin S Glassburn

Gregory W Keck

Brian L Dawes

Carl J Gilman

Donald Lee Keyes

Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U) and negative second lens units (U) where the negative second lens units are customized in terms of at least one optical property for at least two of the colors of light produced by the CRTs with which the units are used. The at least one optical property is not spectral transmission, although the second lens units can also be customized for spectral transmission. As illustrated in FIGS.B&#x2013;F and FIGS.B&#x2013;F, such customization of a non-transmissive property provides an effective and cost effective approach for improving the color performance of CRT projection lens systems. Constructions for the positive first lens unit which improve image contrast and reduce manufacturing costs are also provided.

Lens systems for projection televisions

A lens assembly adapted to be connected to a CRT and affixed to mounting structure in a projection television cabinet. The lens assembly includes a tubular lens mount having a longitudinal axis and at least a first optical lens element mounted along the longitudinal axis. A tubular focus mount extends along the longitudinal axis and fastening and locking structure connects the lens mount to the focus mount after a focus mount position is obtained. A CRT coupler is formed integrally with the focus mount and includes structure for securing a CRT and for securing the coupler to the mounting structure within the television cabinet. A second optical lens element is mounted to the CRT coupler. A flexible bladder may be used to contain coolant fluid between the CRT and the coupler.

Lens assembly with integrated focus mount and CRT coupler

In a projection display system for example, a projection lens includes a non-radially symmetrical light stopped that is painted or otherwise applied directly to the surface of an optical lens element of the projection lines.

Non-symmetrical light stop

Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U ) and negative second lens units (U ) where the negative second lens units are customized in terms of at least one optical property for at least two of the colors of light produced by the CRTs with which the units are used. The at least one optical property is not spectral transmission, although the second lens units can also be customized for spectral transmission. As illustrated in FIGS. B- F and FIGS. B- F, such customization of a non-transmissive property provides an effective and cost effective approach for improving the color performance of CRT projection lens systems. Constructions for the positive first lens unit which improve image contrast and reduce manufacturing costs are also provided.

Growing community of inventors

Georgetown, OH, United States of America

Michael B Larson