# US 2014/0192411 A1 · Optical Device, Imaging Device And Manufacturing Method Of Imaging Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192411 A1 - Document ID: US20140192411A1 - Status: Published application - Kind: A1 - Application number: 14/235,735 - Filed: 2012-07-27 - Published: 2014-07-10 - Earliest claimed: 2011-07-28 - Inventors: Kenichiro Hirata - Web page: https://patentgrep.com/patent/US20140192411A1 ## CPC - G02B 27/0006: {with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B)} - G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures - G02B 1/14: Protective coatings, e.g. hard coatings - G02B 1/18: Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence) - G02B 7/028: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Provided is an optical device and the like which can suppress a decrease in optical performance even under high-temperature heating environments, such as a ref low process. Since at least one of compound lenses 10 and 110 made of heat-resistant resin includes an antireflection structure 51 as a fine asperity structure layer on an inside surface facing a space, even if a subsequent heat treatment is performed, a decrease in optical performance of the lens due to wrinkling can be prevented unlike a case in which an antireflection film is provided. The antireflection structure 51 is covered, for example, by a thin protective layer 52. ## Claims ### Claim 1 An optical device, comprising: a lens; an optical member which faces the lens via a space; and a sealing member which airtightly seals the space disposed between the lens and the optical member, wherein the lens is made of heat-resistant resin and has a fine asperity structure layer which is an antireflection layer on an inside surface facing the space, the asperity structure layer being made of substantially the same material as that of a base of the lens and the asperity structure layer and the base of the lens being formed integrally. ### Claim 2 (depends on 1) The optical device according to claim 1, wherein the heat-resistant resin is one of thermosetting resin and photocuring resin. ### Claim 3 (depends on 1) The optical device according to claim 1, wherein the sealing member is an adhesive which joins the lens and the optical member at a position out of an optical path. ### Claim 4 (depends on 1) The optical device according to claim 1, wherein the sealing member is a lens barrel which mutually aligns and retains the lens and the optical member. ### Claim 5 (depends on 1) The optical device according to claim 1, wherein the sealing member is a spacer which mutually aligns and joins the lens and the optical member. ### Claim 6 (depends on 5) The optical device according to claim 5, wherein: the lens includes a flat plate portion; the flat plate portion includes a resin layer which is made of the heat-resistant resin on at least an inside surface facing the space; an outer diameter of the resin layer is smaller than an outer diameter of the flat plate portion; and the spacer is joined to a surface of the flat plate portion at which the flat plate portion is exposed from the resin layer. ### Claim 7 (depends on 1) The optical device according to claim 1, wherein the lens includes an optical surface and a flange surface which extends from the periphery of the optical surface, and the asperity structure layer is provided on the optical surface. ### Claim 8 (depends on 1) The optical device according to claim 1, wherein the lens includes an optical surface and a flange surface which extends from the periphery of the optical surface, and the asperity structure layer is provided on the optical surface and on the flange surface. ### Claim 9 (depends on 1) The optical device according to claim 1, wherein the lens is a first lens element and the optical member is a second lens element. ### Claim 10 (depends on 9) The optical device according to claim 9, further comprising an imaging element which is disposed at either of a position of the opposite side of the second lens element adjoining the first lens element, or a position of the opposite side of the first lens element adjoining the second lens element, the imaging element being configured to detect a light beam which has passed the first and second lens elements. ### Claim 11 (depends on 9) The optical device according to claim 9, wherein the second lens element includes no fine asperity structure layer made of heat-resistant resin and no antireflection film on a surface facing the space and thus a base is exposed. ### Claim 12 (depends on 9) The optical device according to claim 9, wherein the second lens element is made of heat-resistant resin and has a fine asperity structure layer on a surface facing the space. ### Claim 13 (depends on 9) The optical device according to claim 9, wherein an antireflection film or a protective film is formed on at least one of a surface of the first lens element on the opposite side of the second lens element and a surface of the second lens element on the opposite side of the first lens element. ### Claim 14 (depends on 9) The optical device according to claim 9, wherein a fine asperity structure layer is formed on at least one of a surface of the first lens element on the opposite side of the second lens element and a surface of the second lens element on the opposite side of the first lens element. ### Claim 15 (depends on 1) The optical device according to claim 1, wherein the optical member is an imaging element configured to detect a light beam which has passed the lens. ### Claim 16 (depends on 1) The optical device according to claim 1, wherein the asperity structure layer includes an antireflection structure and a protective layer formed on a surface of the antireflection structure. ### Claim 17 (depends on 1) An imaging device comprising the optical device according to claim 1. ### Claim 18 A manufacturing method of an imaging device which includes a lens and an optical member which faces the lens via a space, the method comprising: a process to form a fine asperity structure layer which is an antireflection layer made of heat-resistant resin on an inside surface of the lens to face the space; a process to fix the lens and the optical member while airtightly sealing the space disposed between the lens and the optical member by a sealing member; and a process to heat-treat the fixed lens and the optical member.