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US 7,803,455 B2Granted
Optical element and optical pickup apparatus
AssigneeKonica Minolta Opto, Inc.
InventorsKunihiko Taka, Tatsuo Ohta, Katsuya Nakamura
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Abstract
The present invention provides an optical element including: a substrate; and an antireflection film formed on a surface of the substrate. The antireflection film includes a plurality of lower refractive index layers, and a plurality of higher refractive index layers which are layered alternately. Each of at least two of the plurality of lower refractive index layers comprises a same main component each other and comprises a side component with a different content ratio independently.
Claims17
An optical element comprising:
- a substrate;
- and
- an antireflection film formed on a surface of the substrate comprising:
- a plurality of lower refractive index layers having a refractive index equal to or more than 1.4 and equal to or less than 1.6 for a light flux with a wavelength of 450 mm;
- and
- a plurality of higher refractive index layers having a refractive index equal to or more than 1.8 and equal to or less than 2.2 for a light flux with a wavelength of 450 nm,
- wherein the plurality of lower refractive index layers and the plurality of higher refractive index layers are layered alternately,
- each of the plurality of the lower refractive index layers comprises a main component, and
- at least two of the plurality of the lower refractive index layers comprise a side component, and
- percentages for the side component in at least two of the plurality of the lower refractive index layers are different, and
- each of the plurality of the high refractive index layer adjoins at least one lower refractive index layer comprising a side component.
8 more elements
An optical element, comprising:
- a substrate;
- and
- an antireflection film formed on a surface of the substrate comprising:
- a plurality of lower refractive index layers having a refractive index equal to or more than 1.4 and equal to or less than 1.6 for a light flux with a wavelength of 450 nm, and
- a plurality of higher refractive index layers having a refractive index equal to or more than 1.8 and equal to or less than 2.2 for a light flux with a wavelength of 450 nm,
- wherein the plurality of lower refractive index layers and the plurality of higher refractive index layers are layered alternately, and
- each of the plurality of the lower refractive index layers comprises an identical main component, at least two of the plurality of the lower refractive index layers comprise a side component, and
- percentages for the side component in at least two of the plurality of the lower refractive index layers are different,
- wherein the antireflection layer comprises:
- a first layer arranged at a closest position to the substrate and having a layer thickness in a range of 100 nm to 130 nm;
- a second layer arranged at a second closest position to the substrate and having a layer thickness in a range of 10 nm to 14 nm;
- a third layer arranged at a third closest position to the substrate and having a layer thickness in a range of 28 nm to 36 nm;
- a fourth layer arranged at a fourth closest position to the substrate and having a layer thickness in a range of 46 nm to 60 nm;
- a fifth layer arranged at a fifth closest position to the substrate and having a layer thickness in a range of 13 nm to 17 nm;
- a sixth layer arranged at a sixth closest position to the substrate and having a layer thickness in a range of 44 nm to 55 nm;
- and
- a seventh layer arranged at a seventh closest position to the substrate and having a layer thickness in a range of 75 nm to 95 nm.
14 more elements
An optical element comprising:
- a substrate;
- and
- an antireflection film formed on a surface of the substrate comprising
- a plurality of lower refractive index layers having a refractive index equal to or more than 1.4 and equal to or less than 1.6 for a light flux with a wavelength of 450 nm, and
- a plurality of higher refractive index layers having a refractive index equal to or more than 1.8 and equal to or less than 2.2 for a light flux with a wavelength of 450 nm,
- wherein the plurality of lower refractive index layers and the plurality of higher refractive index layers are layered alternately, and
- each of the plurality of the lower refractive index layers comprises an identical main component, at least two of the plurality of the lower refractive index layers comprise a side component, and
- percentages for the side component in at least two of the plurality of the lower refractive index layers are different,
- wherein the antireflection layer comprises:
- a first layer arranged at a closest position to the substrate and having a layer thickness in a range of 85 nm to 105 nm;
- a second layer arranged at a second closest position to the substrate and having a layer thickness in a range of 11 nm to 15 nm;
- a third layer arranged at a third closest position to the substrate and having a layer thickness in a range of 30 nm to 38 nm;
- a fourth layer arranged at a fourth closest position to the substrate and having a layer thickness in a range of 54 nm to 68 nm;
- a fifth layer arranged at a fifth closest position to the substrate and having a layer thickness in a range of 20 nm to 25 nm;
- a sixth layer arranged at a sixth closest position to the substrate and having a layer thickness in a range of 34 nm to 43 nm;
- and
- a seventh layer arranged at a seventh closest position to the substrate and having a layer thickness in a range of 85 nm to 108 nm.
14 more elements
An optical element comprising:
- a substrate;
- and
- an antireflection film formed on a surface of the substrate comprising:
- a plurality of lower refractive index layers having a refractive index equal to or more than 1.4 and equal to or less than 1.6 for a light flux with a wavelength of 450 nm and
- a plurality of higher refractive index layers having a refractive index equal to or more than 1.8 and equal to or less than 2.2 for a light flux with a wavelength of 450 nm,
- wherein the plurality of lower refractive index layers and the plurality of higher refractive index layers are layered alternately, and
- each of the plurality of the lower refractive index layers comprises an identical main component, at least two of the plurality of the lower refractive index layers comprise a side component, and
- percentages for the side component in at least two of the plurality of the lower refractive index layers are different,
- wherein the antireflection layer comprises:
- a first layer arranged at a closest position to the substrate and having a layer thickness in a range of 100 nm to 130 nm;
- a second layer arranged at a second closest position to the substrate and having a layer thickness in a range of 13 nm to 17 nm;
- a third layer arranged at a third closest position to the substrate and having a layer thickness in a range of 42 nm to 52 nm;
- a fourth layer arranged at a fourth closest position to the substrate and having a layer thickness in a range of 50 nm to 63 nm;
- a fifth layer arranged at a fifth closest position to the substrate and having a layer thickness in a range of 13 nm to 17 nm;
- a sixth layer arranged at a sixth closest position to the substrate and having a layer thickness in a range of 52 nm to 65 nm;
- and
- a seventh layer arranged at a seventh closest position to the substrate and having a layer thickness in a range of 85 nm to 108 nm.
14 more elements
An optical element comprising:
- a substrate;
- and
- an antireflection film formed on a surface of the substrate comprising
- a plurality of lower refractive index layers having a refractive index equal to or more than 1.4 and equal to or less than 1.6 for a light flux with a wavelength of 450 nm, and
- a plurality of higher refractive index layers having a refractive index equal to or more than 1.8 and equal to or less than 2.2 for a light flux with a wavelength of 450 nm,
- wherein the plurality of lower refractive index layers and the plurality of higher refractive index layers are layered alternately, and
- each of the plurality of the lower refractive index layers comprises an identical main component, at least two of the plurality of the lower refractive index layers comprise a side component, and
- percentages for the side component in at least two of the plurality of the lower refractive index layers are different,
- wherein the antireflection layer comprises:
- a first layer arranged at a closest position to the substrate and having a layer thickness in a range of 80 nm to 100 nm;
- a second layer arranged at a second closest position to the substrate and having a layer thickness in a range of 10 nm to 14 nm;
- a third layer arranged at a third closest position to the substrate and having a layer thickness in a range of 46 nm to 58 nm;
- a fourth layer arranged at a fourth closest position to the substrate and having a layer thickness in a range of 10 nm to 14 nm;
- a fifth layer arranged at a fifth closest position to the substrate and having a layer thickness in a range of 14 nm to 18 nm;
- a sixth layer arranged at a sixth closest position to the substrate and having a layer thickness in a range of 33 nm to 42 nm;
- a seventh layer arranged at a seventh closest position to the substrate and having a layer thickness in a range of 27 nm to 35 nm;
- a eighth layer arranged at a eighth closest position to the substrate and having a layer thickness in a range of 35 nm to 45 nm;
- and
- a ninth layer arranged at a ninth closest position to the substrate and having a layer thickness in a range of 94 nm to 117 nm.
16 more elements
An optical pickup apparatus, comprising:
- a first light source for emitting a first light flux;
- an objective lens for converging the first light flux emitted from the first light flux to an information recording medium;
- and
- an optical element arranged on an optical path of the first light flux,
- wherein the optical element comprises:
- a substrate;
- and
- an antireflection film formed on a surface of the substrate comprising
- a plurality of lower refractive index layers having a refractive index equal to or more than 1.4 and equal to or less than 1.6 for a light flux with a wavelength of 450 nm, and
- a plurality of higher refractive index layers having a refractive index equal to or more than 1.8 and equal to or less than 2.2 for a light flux with a wavelength of 450 nm,
- the plurality of lower refractive index layers and the plurality of higher refractive index layers are layered alternately, and
- each of the plurality of the lower refractive index layers comprises a main component, and
- each of the plurality of the lower refractive index layers comprises a main component, at least two of the plurality of the lower refractive index layers comprise a side component, and
- percentages for the side component in at least two of the plurality of the lower refractive index layers are different, and
- each of the plurality of the high refractive index layer adjoins at least one lower refractive index layer comprising a side component.
12 more elements
Dependencies are inferred from the claim text.