IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0092808
(2005-03-30)
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등록번호 |
US-7554736
(2009-07-09)
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우선권정보 |
JP-2004-109917(2004-04-02) |
발명자
/ 주소 |
- Ohta, Tatsuo
- Nozaki, Takashi
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출원인 / 주소 |
- Konica Minolta Opto, Inc.
|
대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
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인용정보 |
피인용 횟수 :
2 인용 특허 :
3 |
초록
▼
An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a poly
An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.
대표청구항
▼
What is claimed is: 1. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens comprising: a
What is claimed is: 1. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, and wherein the antireflection film comprises: a first layer containing aluminum oxide, the first layer satisfying: 45 nm≦d1≦90 nm, where d1 represents a thickness of the first layer, and a second layer containing silicon oxide, magnesium fluoride, a mixture of silicon oxide and aluminum oxide, or a mixture of silicon oxide and magnesium fluoride, the second layer satisfying: 60 nm≦d2≦90 nm, where d2 represents a thickness of the second layer. 2. The objective lens of claim 1, wherein a layer containing the low refractive index material is provided between the lens body and the first layer. 3. The objective lens of claim 1, wherein the polymer resin forming the lens body contains hydrogenated norbornene ring-opening polymer. 4. An optical pickup apparatus comprising the objective lens of claim 1 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm. 5. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens in placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, wherein the antireflection film comprises: a first layer containing an intermediate refractive index material, a thickness of the first layer d1 satisfying: 80 nm≦d1<120 nm, a second layer containing a low refractive index material, a thickness of the second layer d2 satisfying: 35 nm≦d2≦65nm, a third layer containing the intermediate refractive index material, a thickness of the third layer d3 satisfying: 140 nm≦d3≦180 nm a fourth layer made of the low refractive index material, a thickness of the fourth layer d4 satisfying: 70 nm≦d4≦105 nm, wherein the low refractive index material contains silicon oxide, magnesium fluoride, a mixture of silicon oxide and aluminum oxide, or a mixture of silicon oxide and magnesium fluoride, and wherein the intermediate refractive index material contains aluminum oxide or a material containing aluminum oxide as a main component. 6. The objective lens of claim 5, wherein a layer containing the low refractive index material is provided between the lens body and the first layer. 7. The objective lens of claim 5, wherein the polymer resin forming the lens body contains hydrogenated norbornene ring-opening polymer. 8. An optical pickup apparatus comprising the objective lens of claim 5 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm. 9. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens in placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, wherein the antireflection film comprises: a first layer containing a low refractive index material, a thickness of the first layer d1 satisfying: 70 nm≦d1≦100 nm, a second layer containing an intermediate refractive index material, a thickness of the second layer d2 satisfying: 15 nm≦d2≦40 nm, a third layer containing the low refractive index material, a thickness of the third layer d3 satisfying: 75 nm≦d3≦90 nm, a fourth layer containing the intermediate refractive index material, a thickness of the fourth layer d4 satisfying: 55 nm≦d4≦75 nm, a fifth layer made of a low refractive index material, a thickness of the fifth layer d5 satisfying: 3 nm≦d5≦20 nm, a sixth layer containing an intermediate refractive index material, a thickness of the sixth layer d6 satisfying: 70 nm≦d6≦95 nm, a seventh layer containing the low refractive index material, a thickness of the seventh layer d7 satisfying: 95 nm≦d7≦120 nm wherein the low refractive index material contains silicon oxide, magnesium fluoride, a mixture of silicon oxide and aluminum oxide, or a mixture of silicon oxide and magnesium fluoride, and wherein the intermediate refractive index material contains aluminum oxide or a material containing aluminum oxide as a main component. 10. The objective lens of claim 9, wherein the polymer resin forming the lens body contains hydrogenated norbornene ring-opening polymer. 11. An optical pickup apparatus comprising the objective lens of claim 9 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm. 12. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens in placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, wherein the polymer resin forming the lens body contains an alicyclic hydrocarbon copolymer having a weight average molecular weight (Mw) of 1,000 to 1,000,000, and wherein the copolymer contains: repeat unit (a) having a alicyclic structure represented by Formula (1), and repeat unit (b) having a chain structure represented by Formula (2) or Formula (3), provided that: a total weight of repeat units (a) and repeat units (b) is 90% by weight or more, and a total weight of repeat units (b) is 1% by weight or more and less than 10% by weight, and where in Formula (1), X represents an alicyclic hydrocarbon group, R1 through R13 in Formulae (1), (2) and (3) each independently represent a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ether group, an ester group, a cyano group, an amide group, an imide group, a silyl group and a chain hydrocarbon group substituted by a polar group (a halogen atom, an alkoxy group, a hydroxyl group, an ether group, an ester group, a cyano group, an amide group, an imino group or a silyl group), and in Formula (3), " . . . " represents a carbon-carbon saturated bond or a carbon-carbon unsaturated bond. 13. The objective lens of claim 12, wherein the polymer resin forming the lens body contains a block polymer containing: polymer block [A] having repeat unit [1] represented by Formula (11), and polymer block [B] having repeat unit [1] represented by Formula (11), repeat unit [2] represented by Formula (12) and repeat unit [3] represented by Formula (13), where, in Formula (11), R1 represents a hydrogen atom or an alkyl group having a carbon number of 1 to 20, R2 through R12 each independently represent a hydrogen atom, an alkyl group having a carbon number of 1 to 20, a hydroxyl group, an alkoxy group having a carbon number of 1 to 20 or a halogen group, where, in Formula (12), R13 represents a hydrogen atom or an alkyl group having a carbon number of 1 to 20, and where, in Formula (13), R14 and R15 each independently represent a hydrogen atom or an alkyl group having a carbon number of 1 to 20. 14. An optical pickup apparatus comprising the objective lens of claim 12 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm. 15. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens in placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, wherein the lens body comprises: a first optical element arranged at the light source side of the lens body, and a second optical element arranged at the optical information recording medium side of the lens body, wherein the second optical element has a positive paraxial power and the objective lens satisfies Formula (41) and Formula (42), |P1/P2|≦0.2 Formula (41) 0.8≦d2/f2 ≦1.8 Formula (42) wherein in Formula (41), P1 represents a paraxial power of the first optical element and P2 represents a paraxial power of the second optical element, and wherein in Formula (42), d2 represents a thickness of the second optical element on an optical axis and f2 represents a focal length of the second optical element. 16. An optical pickup apparatus comprising the objective lens of claim 15 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm. 17. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens in placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, wherein the lens body comprises: a first optical element on a surface of the lens body facing a light source, and a second optical element on a surface of the lens body facing to the optical information recording medium, wherein the first optical element and the second optical element each has a positive paraxial power and the objective lens satisfies Formula (51) and Formula (52), 0.8≦NA Formula (51) 0.2≦β≦0.5 Formula (52) wherein in Formula (51), NA represents a numerical aperture on an image side, and wherein in Formula (52), β represents a lens magnification of the second optical element. 18. An optical pickup apparatus comprising the objective lens of claim 17 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm. 19. An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens in placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7, and wherein the lens body contains a single constituent, and the objective lens satisfies Formula (60), 0.8≦d/f≦1.8 Formula (60) where, in Formula (60), d represents a thickness of the objective lens on an optical axis, and f represents a focal length of the objective lens for a light flux having a wavelength of 405 nm. 20. An optical pickup apparatus comprising the objective lens of claim 19 and a light source emitting the monochromatic light having the specific wavelength in the range of 350 to 450 nm.
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