# US 2010/0165490 A1 · Lens and optical unit including the same

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- Number: US 2010/0165490 A1
- Document ID: US20100165490A1
- Status: Published application
- Kind: A1
- Application number: 12/733,412
- Filed: 2008-08-25
- Published: 2010-07-01
- Earliest claimed: 2007-08-27
- Assignees: Teijin Chemicals, Ltd.
- Inventors: Hideyuki Tsunemori
- Web page: https://patentgrep.com/patent/US20100165490A1

## CPC

- C08G 64/06: not containing aliphatic unsaturation
- G02B 1/041: {Lenses}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

It is an object of the present invention to provide a lens having small birefringence, large refraction and excellent transparency and heat resistance and an optical unit including the lens. The present invention is a lens obtained from a polycarbonate copolymer (I) which is composed of a unit (A) represented by the following formula: (R1 to R4 are each independently a hydrogen atom, hydrocarbon group having 1 to 9 carbon atoms or halogen atom) and a unit (B) represented by the following formula: (plurality of R5 and R6 are each independently a hydrogen atom or the like, and R7 and R8 are each independently a hydrogen atom or alkyl group having 1 to 9 carbon atoms, with the proviso that the total number of carbon atoms of R7 and R8 is 9 or 10), the content of the unit (A) being 50 to 80 mol % of the total of all the units, and an optical unit including the lens.

## Claims

### Claim 1

A lens obtained from a polycarbonate copolymer (I) which is composed of a unit (A) represented by the following formula:
(R1 to R4 are each independently a hydrogen atom, hydrocarbon group having 1 to 9 carbon atoms or halogen atom)
and a unit (B) represented by the following formula:
(R5 and R6 are each independently a hydrogen atom, alkyl group having 1 to 6 carbon atoms, aryl group having 6 to 10 carbon atoms or alkoxy group having 1 to 6 carbon atoms, and R7 and R8 are each independently a hydrogen atom or alkyl group having 1 to 9 carbon atoms, with the proviso that the total number of carbon atoms of R7 and R8 is 9 or 10),
the content of the unit (A) being 50 to 80 mol % of the total of all the units.

### Claim 2 (depends on 1)

The lens according to claim 1, wherein the content of the unit (A) is 65 to 75 mol % of the total of all the units of the polycarbonate copolymer (I).

### Claim 3 (depends on 1)

The lens according to claim 1, wherein the unit (A) of the polycarbonate copolymer (I) is a unit derived from 9,9-bis(4-hydroxy-3-methylphenyl)fluorene.

### Claim 4 (depends on 1)

The lens according to claim 1, wherein the unit (B) of the polycarbonate copolymer (I) is a unit derived from 1,1-bis(4-hydroxyphenyl)decane.

### Claim 5 (depends on 1)

The lens according to claim 1, wherein the refractive index at a wavelength of 589 nm (Na-D line) of the polycarbonate copolymer (I) is 1.600 to 1.650.

### Claim 6 (depends on 1)

The lens according to claim 1, wherein the polycarbonate copolymer (I) has an Abbe number of 20 to 35.

### Claim 7 (depends on 1)

The lens according to claim 1, wherein the polycarbonate copolymer (I) has a refractive index at a wavelength of 589 nm (Na-D line) of 1.600 to 1.650 and an Abbe number of 20 to 35.

### Claim 8 (depends on 1)

The lens according to claim 1, wherein the birefringence of the polycarbonate copolymer (I) is 0.3×10−4 to 1×10−4.

### Claim 9 (depends on 1)

An optical unit which includes the lens of claim 1 and a plastic lens having an Abbe number of 45 to 60.

### Claim 10 (depends on 9)

The optical unit according to claim 9, wherein the plastic lens having an Abbe number of 45 to 60 is obtained from an alicyclic polyolefin.

### Claim 11 (depends on 9)

The optical unit according to claim 9, wherein the alicyclic polyolefin has a refractive index at a wavelength of 589 nm (Na-D line) of 1.450 to 1.550 and an Abbe number of 45 to 60.

### Claim 12 (depends on 9)

The optical unit according to claim 9 which includes a plurality of plastic lenses having an Abbe number of 45 to 60.

### Claim 13 (depends on 9)

The optical unit according to claim 9 which is used in mobile telephones.

### Claim 14 (depends on 9)

The optical unit according to claim 9 which is used in digital cameras.