`APPLE INC. v. COREPHOTONICS LTD.
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`APPL-1018 / Page 2 of 4
`APPLE INC. v. COREPHOTONICS LTD.
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`Library of Congress Cataloging-in-Publication Data
`
`Names: Symmons, Alan, author. | Schaub, Michael P., author.
`Title: Field guide to molded optics / Alan Symmons and Michael Schaub.
`Other titles: Molded optics
`Description: Bellingham, Washington USA : SPIE Press, [2016] | © 2016 |
`Series: SPIE field guides | Includes bibliographical references and index.
`Identifiers: LCCN 2015047156| ISBN 9781510601246 (spiral ; alk. paper) |
`ISBN 1510601244 (spiral ; alk. paper) | ISBN 9781510601253 (PDF) |
`ISBN 1510601252 (PDF) | ISBN 9781510601260 (epub) | ISBN
`1510601260 (epub) | ISBN 9781510601277 (Kindle) | ISBN 1510601279
`(Kindle)
`Subjects: LCSH: Optical instruments–Design and construction–
`Handbooks, manuals, etc. | Optical materials–Handbooks, manuals, etc. |
`Plastics–Optical properties–Handbooks, manuals, etc.
`Classification: LCC TS513 .S96 2016 | DDC 620.1/1295–dc23
`LC record available at http://lccn.loc.gov/2015047156
`
`Published by
`
`SPIE
`P.O. Box 10
`Bellingham, Washington 98227-0010 USA
`Phone: 360.676.3290
`Fax: 360.647.1445
`Email: Books@spie.org
`Web: www.spie.org
`
`Copyright © 2016 Society of Photo-Optical Instrumentation Engineers
`(SPIE)
`
`All rights reserved. No part of this publication may be reproduced or
`distributed in any form or by any means without written permission of the
`publisher.
`
`The content of this book reflects the thought of the authors. Every effort has
`been made to publish reliable and accurate information herein, but the
`publisher is not responsible for the validity of the information or for any
`outcomes resulting from reliance thereon.
`
`Printed in the United States of America.
`First printing.
`For updates to this book, visit http://spie.org and type “FG37” in the search
`field.
`
`APPL-1018 / Page 3 of 4
`APPLE INC. v. COREPHOTONICS LTD.
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`Materials
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`27
`
`Glass versus Plastic
`
`When comparing glass to plastic for molded optics,
`moldable glass provides an expansive range of options
`with superior performance in all material properties with
`the exception of specific gravity and impact strength.
`
`Advantages of Glass
`
`Advantages of Plastic
`
`(cid:129) Selection
`(cid:129) Range of optical
`properties
`(cid:129) Thermal properties
`(cid:129) Transmission
`(cid:129) Durability
`(cid:129) Environmental
`considerations
`
`(cid:129) Cost
`(cid:129) Weight
`(cid:129) Impact strength
`(cid:129) Integrated features
`(cid:129) More than two optical
`surfaces
`
`Glass also provides a better selection of optical properties
`for designers to choose from.
`
`Plastic provides a distinct cost and weight advantage and
`an excellent ability for forming complicated surfaces and
`integrated features. Disadvantages of plastics include: high
`static buildup that attracts foreign particles and can lower
`cosmetic surface qualities, high thermal expansion, and
`high temperature coefficient of refractive index. Plastics
`cannot be cemented or coated as easily as glass.
`
`Field Guide to Molded Optics
`
`APPL-1018 / Page 4 of 4
`APPLE INC. v. COREPHOTONICS LTD.
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