Lens Systems for CRT-Based Rear Projection Televisions

High Performance Digital Lens Systemswith Thermal Compensation Module (TCM)• Innovative thermal drift compensation using a thermal bar that is

incorporated into the lens housings.• On axis there is a 60% improvement over other standard 3M VikuitiTM

lens systems.• In the corners there is a 50% improvement over standard lens

systems.• Available with our patented ECP (Enhanced Color Purity) filters.• Will initially only be available in the VikuitiTM Delta 260 and our

color-correction lens systems.

Innovation

VikuitiTM Delta 260 TCM

How the Lens Works

Lens Main Housing Showing Thermal Bar

Thermal Bar�

Thermal Bar�

Cut Away Showing MainHousing with ThermalBar in Focus Mount

Thermal CompensationModule (TCM)Heat generated by the CRT’s in anRPTV can cause the image to driftslightly out of focus. By incorporatingthe latest in composite materialdevelopment and mechanical design,our high performance digital lenssystem with a thermal compensationmodule remains in focus throughout awide range of operating temperatures.The key component of this proprietaryinvention is the thermal bar. As theRPTV heats up, the thermal barexpands, pushing the lens closer tothe CRT and refocusing the image.This passive compensation results inthe sharpest of images.

Specifications*

Cabinet Information Delta 260 TCM

Screen Diagonal TCL (raster size 4.8”)

56” 1050 mm

65” 1200 mm

Optical Performance

Contrast 250:1

f/# 1.06

Color Correction no

Thermal Bar yes

Other

Focal Length 77 mm

CRT Size 7”

*Subject to change-preliminary design

How Enhanced Color Purity(ECP) Filters WorkThe CRTs in rear-projection televisions (RPTV) displaymore colors than desired. Years of research haveresulted in the color filtration in our patented ECPfilters. ECP minimizes the transmission of unwantedwavelengths while maximizing the transmission ofdesired wavelengths and the optical performance of thelens system. Red and green filters are available andare incorporated into the C-element. ECP increasesthe color palette of the RPTV, resulting in brilliant colorsthat more accurately reproduce the image.

This graph shows the spectral output of a typical greenCRT. As you can see, there are more colors producedthan green (about 540nm). The green line shows thepercentage of light transmitted by our ECP filters.

3M Precision Optics, Inc.3997 McMann Road Cincinnati, Ohio 45245United States of AmericaPhone: 513-752-7000 Fax: 513-752-2841 E-mail: 3MPO-info@mmm.comwww.3Mprecisionoptics.com

Vikuiti and the Vikuiti “Eye” symbol are trademarks of 3M. Copyright © 3M 2002

Preliminary Product NoticeThis prototype or product (the “Product”) is developmental and made available to therecipient (“Recipient”) on a non-exclusive basis for the sole purpose of evaluating itsuse in Recipient’s application. Product may vary product-to-product and lot-to-lot or bechanged in the future without notice. 3M does not guarantee future availability. Productis transferred subject to 3M’s Standard Terms and Conditions, except as modified bythis Notice. Recipient has the sole responsibility for determining if a Product is fit forRecipient’s particular purposes and suitable for Recipient’s production methods. THESAMPLE PRODUCT IS BEING PROVIDED “AS IS, WHERE IS.” EXCEPT AS TOTITLE, 3M MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUTNOT LIMITED TO ANY (1) IMPLIED WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE, OR WARRANTIES ARISING OUT OF ACOURSE OF DEALING, CUSTOM OR TRADE; (2) WARRANTY RELATING TO APRODUCT’S EFFECTIVE LIFE OR ENVIRONMENTAL STABILITY; OR (3) PROMISETHAT TECHNICAL ISSUES NECESSARY TO DEVELOP A COMMERCIAL VERSIONOF A PRODUCT WILL BE RESOLVED. 3M WILL NOT, UNDER ANYCIRCUMSTANCES, BE LIABLE FOR DIRECT, SPECIAL, INCIDENTAL, INDIRECTOR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OFPROFITS) RESULTING FROM OR IN ANY WAY RELATED TO THE SAMPLEPRODUCT. This limitation applies regardless of whether the damages or other reliefare sought based on breach of warranty, breach of contract, negligence, strict liability intort, or any other legal or equitable theory.