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US 7,582,355 B2Granted
Optical unit using plastic lenses
AssigneeFUJIFILM Corporation
InventorsFumiyuki Suzuki, Noriko Eiha
Life of this patent
Estimating the term…
Abstract
The present invention provides an optical unit for high-resolution applications all lenses in which are made of plastics. The optical unit includes lens (1) and (2). The lens (1) is a plastic lens having an Abbe number of 45-60. The lens (2) is a lens injection molded from a polycarbonate material comprising a structure derived from spirobiindan and having a glass transition temperature of 120-150° C.
Claims43
An optical unit comprising:
- a first lens which is a plastic lens having an Abbe number of 45-60;
- and
- a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (A) having structural units represented by the following general formulas (1) and (2):
- where R1 and R3 are each independently an alkyl group, an alkoxy group, a nitro group or a halogen atom;
- R2 is a hydrogen atom or a methyl group;
- k and l are each independently an integer of 0-3;
- m and n are each independently an integer of 0-20, provided that at least one of m and n is other than zero.
4 more elements
An optical unit comprising:
- a first lens which is a plastic lens having an Abbe number of 45-60;
- and
- a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (B) having structural units represented by the following general formulas (2) and (3):
- where R3's are each independently an alkyl group, an alkoxy group, a nitro group or a halogen atom;
- R4 and R5 are each independently a hydrogen atom or an alkyl group;
- R6's are each independently an alkyl group, an alkoxy group or a halogen atom;
- l's are each independently an integer of 0-3;
- and j's are each independently an integer of 0-2.
5 more elements
An optical unit comprising:
- a first lens which is a plastic lens having an Abbe number of 45-60;
- and
- a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (C) that has structural units represented by the following general formulas (4), (5) and (6) and wherein the structural unit of the general formula (4) assumes 5-50 moles in all structural units:
An optical unit comprising:
- a first lens which is a plastic lens having an Abbe number of 45-60;
- and
- a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (D) that has structural units represented by the following general formulas (4), (5) and (7) and wherein the structural unit of the general formula (4) assumes 5-50 mole % in all structural units:
An optical unit comprising:
- a first lens which is a plastic lens having an Abbe number of 45-60;
- and
- a second lens which is a lens injection molded from a polycarbonate material comprising a polycarbonate copolymer (E) being the product of reaction of 6,6′-dihydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindan, 4,4′-[1,3-phenylenebis(1-methylethylidene)]bisphenol, a compound having a trifunctional or higher phenolic hydroxyl group and a carbonic ester forming compound.
Dependencies are inferred from the claim text.