Optical system, barrel, and optical instrument using
First Claim
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1. An optical system comprising:
- a plurality of optical elements including a first lens and a second lens; and
a barrel configured to hold the plurality of optical elements,wherein the second lens includes an anti-reflection film formed on an optical surface thereof,wherein the first lens is fixed to the barrel via an energy-curable resin,wherein the energy-curable resin includes a first layer consisting of an epoxy-type UV-curable resin and a second layer consisting of an acrylic UV-curable resin or a silicone UV-curable resin adjacent to the first layer in an optical-axis direction, andwherein the first layer is disposed on a side of the second lens in the optical-axis direction.
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Abstract
Provided is an optical system having at least two or more lenses, wherein at least one of the lenses comprises an anti-reflection film formed by a wetting method on a part of or the entirety of the light beam effective surface thereof, and wherein at least one of the lenses other than the lens comprising the anti-reflection film is fixed to the space between the lens and a barrel for holding the lens via an energy-curable resin to be filled therein.
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Citations
14 Claims
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1. An optical system comprising:
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a plurality of optical elements including a first lens and a second lens; and a barrel configured to hold the plurality of optical elements, wherein the second lens includes an anti-reflection film formed on an optical surface thereof, wherein the first lens is fixed to the barrel via an energy-curable resin, wherein the energy-curable resin includes a first layer consisting of an epoxy-type UV-curable resin and a second layer consisting of an acrylic UV-curable resin or a silicone UV-curable resin adjacent to the first layer in an optical-axis direction, and wherein the first layer is disposed on a side of the second lens in the optical-axis direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
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11. An optical instrument comprising:
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a camera; and an optical system comprising; a plurality of optical elements including a first lens and a second lens; and a barrel configured to hold the plurality of optical elements, wherein the second lens includes an anti-reflection film formed on an optical surface thereof, wherein the first lens is fixed to the barrel via an energy-curable resin, wherein the energy-curable resin includes a first layer consisting of an epoxy-type UV-curable resin and a second layer consisting of an acrylic UV-curable resin or a silicone UV-curable resin adjacent to the first layer in an optical-axis direction, and wherein the first layer is disposed on a side of the second lens in the optical-axis direction.
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Specification