JP2010072053A - Lens barrel and optical apparatus including the same - Google Patents

Lens barrel and optical apparatus including the same Download PDF

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JP2010072053A
JP2010072053A JP2008236321A JP2008236321A JP2010072053A JP 2010072053 A JP2010072053 A JP 2010072053A JP 2008236321 A JP2008236321 A JP 2008236321A JP 2008236321 A JP2008236321 A JP 2008236321A JP 2010072053 A JP2010072053 A JP 2010072053A
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lens barrel
lens
optical element
fine
antireflection
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JP2010072053A5 (en
JP5305799B2 (en
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Kazuhiko Momoki
和彦 桃木
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Canon Inc
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  • Mounting And Adjusting Of Optical Elements (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel capable of holding therein a lens (optical element) provided with a micro convex/concave structure having an antireflection function at least one of light incident and emission surfaces with precise axial alignment having less eccentricity. <P>SOLUTION: The lens barrel includes the optical element having an antireflection element in which the concavity and convexity including a sub-wavelength micro structure is formed on the uppermost surface of one surface and a lens holding structure holding the optical element. The optical element is inserted by abutment with the surface of the micro structure at the side of moving direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、レンズ鏡筒及びそれを有する光学機器に関し、例えば銀塩フィルム用カメラ、デジタルスチルカメラ、ビデオカメラ、ＴＶカメラ、観察系、投射系等の光学機器に好適なものである。   The present invention relates to a lens barrel and an optical apparatus having the same, and is suitable for optical apparatuses such as a silver salt film camera, a digital still camera, a video camera, a TV camera, an observation system, and a projection system.

各種の光学機器の光学系に用いられているレンズやフィルター等の光学素子の光入出射面には、表面反射による透過光の損失を低減させるために反射防止構造体が設けられている。   An antireflection structure is provided on a light incident / exit surface of an optical element such as a lens or a filter used in an optical system of various optical devices in order to reduce loss of transmitted light due to surface reflection.

例えば可視光に対する反射防止構造体として、薄膜の誘電体膜を複数層重ねた多層膜（反射防止膜）が知られている（特許文献１、２）。   For example, a multilayer film (antireflection film) in which a plurality of thin dielectric films are stacked is known as an antireflection structure for visible light (Patent Documents 1 and 2).

この多層膜は、透光性の基板表面に例えば真空蒸着やスパッタリング法等により金属酸化物等の誘電体薄膜を成膜して形成されている。   This multilayer film is formed by depositing a dielectric thin film such as a metal oxide on the surface of a light-transmitting substrate by, for example, vacuum deposition or sputtering.

この他、レンズに用いる反射防止構造体としてレンズ面上に可視光の波長（波長４００ｎｍ〜７００ｎｍ）よりも短いピッチの微細凹凸形状より成る微細部を複数配列した微細凹凸構造体が知られている（特許文献３）。   In addition, a fine concavo-convex structure in which a plurality of fine portions having fine concavo-convex shapes with a pitch shorter than the wavelength of visible light (wavelength 400 nm to 700 nm) are arranged on the lens surface is known as an antireflection structure used for the lens. (Patent Document 3).

特許文献３では、微細凹凸構造体として花弁状透明アルミナ膜を次の各ステップによって形成している。   In Patent Document 3, a petal-like transparent alumina film is formed by the following steps as a fine concavo-convex structure.

（イ）ガラス基板を洗浄
（ロ）Ａｌ２Ｏ３ゾル塗布液をディップコート法で塗布，乾燥
（ハ）５００℃１０分間焼成
（ニ）約１００℃の熱水中に約０．５乃至２時間程度浸漬
（ホ）約１００℃１０分間の乾燥
（ヘ）４００℃１０分程度の焼成
これらの各ステップにより、花弁状透明アルミナ膜（微細凹凸構造体）をガラス基板上に形成した、反射低減膜を開示している。又、特許文献３ではこのような各ステップを用いて得た微細凹凸構造体が分光透過性に優れ、優れた反射低減性を示すことを開示している。
特開平１０−２６８１０３号公報 特開２００６−３５６２号公報 特開平０９−２０２６４９号公報 (B) Cleaning the glass substrate (b) Applying the Al 2 O 3 sol coating solution by dip coating and drying (c) Firing at 500 ° C. for 10 minutes (d) About 0.5 to 2 in about 100 ° C. hot water Immersion for about time (e) Drying at about 100 ° C. for 10 minutes (f) Firing at about 400 ° C. for about 10 minutes By these steps, a petal-like transparent alumina film (fine concavo-convex structure) was formed on the glass substrate, reducing reflection A membrane is disclosed. Patent Document 3 discloses that the fine concavo-convex structure obtained by using each of these steps is excellent in spectral transmittance and exhibits excellent reflection reduction.
Japanese Patent Laid-Open No. 10-268103 JP 2006-3562 A JP 09-202649 A

レンズ面上に可視光の波長よりも短いピッチの複数の微細部を形成した微細凹凸構造体は、広い波長域で、かつ広い入射角度範囲で低い反射率を有する。   A fine concavo-convex structure in which a plurality of fine portions having a pitch shorter than the wavelength of visible light is formed on the lens surface has a low reflectance in a wide wavelength range and a wide incident angle range.

このため、この微細凹凸構造体をレンズやプリズム等の光学素子を用いると、波長帯域性が少ない光学系が得られる。   For this reason, when an optical element such as a lens or a prism is used for the fine concavo-convex structure, an optical system having a small wavelength band property is obtained.

しかしながら微細凹凸構造体を有する光学素子（レンズ）を鏡筒内に収納し、保持する際には、偏心がない状態で精度良く保持されることが重要になってくる。   However, when an optical element (lens) having a fine concavo-convex structure is housed and held in a lens barrel, it is important that the optical element (lens) be held with high accuracy without any eccentricity.

特許文献３に開示されているように、レンズ面に微細凹凸構造体としての花弁状透明アルミナ膜を形成する際には、まずレンズ面にゾルを塗工する。   As disclosed in Patent Document 3, when a petal-like transparent alumina film as a fine concavo-convex structure is formed on a lens surface, first, a sol is applied to the lens surface.

その際に、レンズのコバ部に液ダマリなどのムラができる場合がある。そのため、元のレンズの外形寸法に、液ダマリでのムラによる寸法の増加を見込んで、鏡筒のレンズを保持する部分を勘合寸法の余裕分だけ大きくする必要がある。さらに、液ダマリのムラはレンズ全周囲に均等に付くわけではなく、偏りを生じる場合がある。   In that case, unevenness such as liquid dullness may occur in the edge portion of the lens. Therefore, it is necessary to increase the dimension of the lens barrel holding the lens by an allowance of the fitting dimension in anticipation of an increase in dimension due to unevenness due to liquid dip in the outer dimension of the original lens. Furthermore, the uneven liquid unevenness is not uniformly applied to the entire periphery of the lens, and may be biased.

そのため、外形寸法公差により、レンズを鏡筒内に保持するとき偏心が生じることが多い。このときのレンズ偏心量を軽減するには、鏡筒を高精度に製造しなくてはならない。一般に鏡筒内にレンズを偏心なく保持することは大変困難である。   For this reason, due to the tolerance of external dimensions, eccentricity often occurs when the lens is held in the lens barrel. In order to reduce the amount of lens eccentricity at this time, the lens barrel must be manufactured with high accuracy. In general, it is very difficult to hold the lens in the lens barrel without eccentricity.

微細凹凸構造体を最表面（レンズ面）に有しているレンズを鏡筒内にカシメを行って保持する際には光学面を摺動させることができず、高精度の軸出しが大変困難であった。   When holding a lens having a fine concavo-convex structure on the outermost surface (lens surface) by caulking it in the lens barrel, the optical surface cannot be slid and it is very difficult to accurately center the shaft. Met.

このため、微細凹凸構造体を有するレンズを鏡筒内に収納保持し、レンズ鏡筒を構成するときは、レンズの偏心を軽減することが困難で、特にレンズの偏心敏感度が高くなる光学系には微細凹凸構造体を有する光学素子の適用が大変困難であった。   For this reason, when a lens having a fine concavo-convex structure is housed and held in a lens barrel to constitute a lens barrel, it is difficult to reduce the decentration of the lens, and in particular, an optical system that increases the decentration sensitivity of the lens. It was very difficult to apply an optical element having a fine concavo-convex structure.

本発明は、反射防止機能を有する微細凹凸構造体を光入出射面の少なくとも一方の面に設けたレンズ（光学素子）を鏡筒内に偏心が少なく、高精度に軸出して保持することができるレンズ鏡筒及びそれを有する光学機器の提供を目的とする。   According to the present invention, a lens (optical element) provided with a fine concavo-convex structure having an antireflection function on at least one surface of a light incident / exit surface can be held in a lens barrel with little eccentricity and with high accuracy. An object of the present invention is to provide a lens barrel that can be used and an optical apparatus having the lens barrel.

本発明のレンズ鏡筒は、一方の面の最表面に波長以下の微細構造からなる凹凸が形成された反射防止素子を有する光学素子と、
該光学素子を保持するレンズ保持構造を有するレンズ鏡筒であって、
該光学素子は、その微細構造の面を進行方向側にして突き当てで挿入されている事を特徴としている。 The lens barrel of the present invention is an optical element having an antireflection element in which irregularities having a fine structure of a wavelength or less are formed on the outermost surface of one surface;
A lens barrel having a lens holding structure for holding the optical element,
The optical element is characterized in that it is inserted by abutment with the surface of the microstructure thereof in the traveling direction.

この他、本発明のレンズ鏡筒は、光入出射面の一方の面に、平均ピッチが可視域の波長以下で凹凸形状の微細部を複数有し、反射防止機能を有する微細凹凸構造体を有する光学素子が鏡筒内に保持されているレンズ鏡筒であって、
該光学素子は、該微細凹凸構造体が形成されている面、又は該面側の一部が該鏡筒のレンズ保持部に当接するように挿入されて該鏡筒内に保持されていることを特徴としている。 In addition, the lens barrel of the present invention has a fine concavo-convex structure having an antireflection function, having a plurality of concavo-convex fine portions having an average pitch of not more than a visible wavelength on one surface of the light incident / exit surface. An optical element having a lens barrel held in a lens barrel,
The optical element is inserted and held in the lens barrel so that the surface on which the fine concavo-convex structure is formed or a part of the surface is in contact with the lens holding portion of the lens barrel It is characterized by.

本発明によれば、反射防止機能を有する微細凹凸構造体を光入出射面の少なくとも一方の面に設けたレンズ（光学素子）を鏡筒内に偏心が少なく、高精度に軸出して保持することができるレンズ鏡筒が得られる。   According to the present invention, a lens (optical element) provided with a fine concavo-convex structure having an antireflection function on at least one surface of a light incident / exit surface is held in a lens barrel with little eccentricity and with high accuracy. A lens barrel that can be obtained is obtained.

以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

本発明のレンズ鏡筒は、一方の面の最表面に波長以下の微細構造からなる凹凸が形成された反射防止素子（微細凹凸構造体）を有する光学素子と、光学素子を保持する熱可塑性樹脂から成るレンズ保持構造を有している。   The lens barrel of the present invention includes an optical element having an antireflection element (fine concavo-convex structure) in which concavo-convex having a fine structure of a wavelength or less is formed on the outermost surface of one surface, and a thermoplastic resin holding the optical element A lens holding structure.

光学素子は、その微細構造の面を進行方向側にして突き当てで鏡筒内に挿入されている。光学素子は、熱カシメによりレンズ保持構造に保持されている。このとき熱カシメによるカシメ部は、光学素子の微細構造の面を進行方向側にして圧入する形状より成っている。   The optical element is inserted into the lens barrel by abutting with the surface of the fine structure in the traveling direction. The optical element is held in the lens holding structure by thermal caulking. At this time, the caulking portion by heat caulking has a shape that is press-fitted with the surface of the fine structure of the optical element in the traveling direction.

この他、本発明のレンズ鏡筒は熱可塑性樹脂より成る鏡筒の一部のレンズ保持部に、レンズやフィルター等の光学素子が熱カシメされて保持されている。   In addition, in the lens barrel of the present invention, an optical element such as a lens or a filter is held by being caulked in a part of the lens holding portion of the barrel made of thermoplastic resin.

光学素子は、光入出射面の一方の面に、平均ピッチが可視域の波長以下で凹凸形状の微細部を複数形成した、反射防止機能を有する微細凹凸構造体を有している。   The optical element has a fine concavo-convex structure body having an antireflection function, in which a plurality of concavo-convex fine portions having an average pitch equal to or smaller than the wavelength in the visible region are formed on one surface of the light incident / exit surface.

光学素子は、微細凹凸構造体が形成されている面、又はその面側の一部（有効面の外周部）が鏡筒のレンズ保持部に当接するように挿入されて鏡筒内に保持されている。   The optical element is inserted and held in the lens barrel so that the surface on which the fine concavo-convex structure is formed or a part of the surface (the outer peripheral portion of the effective surface) abuts the lens holding portion of the lens barrel. ing.

ここで凹凸形状とは、多角錐（但し頂点が一部削除されている形状も含む）、円錐、円柱状、角柱状等の形状を含む。微細凹凸構造体は可視域又は可視域と赤外域の双方において反射防止機能を有する。   Here, the concavo-convex shape includes shapes such as a polygonal pyramid (including a shape in which some of the vertices are deleted), a cone, a cylinder, and a prism. The fine concavo-convex structure has an antireflection function in the visible region or in both the visible region and the infrared region.

図１は本発明の実施例１のレンズ鏡筒の要部構成図である。   FIG. 1 is a configuration diagram of a main part of a lens barrel of Embodiment 1 of the present invention.

図１において、１０１はレンズ鏡筒である。レンズ鏡筒１０１は第１のレンズ１と第２のレンズ２と、鏡筒５を有している。   In FIG. 1, reference numeral 101 denotes a lens barrel. The lens barrel 101 has a first lens 1, a second lens 2, and a lens barrel 5.

第１レンズ１のレンズ面１Ｒと第２レンズ２のレンズ面２Ｒにはそれぞれ、波長（可視光）以下のピッチより成る微細部を複数配列した微細凹凸構造体からなる反射防止構造体３ａ、３ｂが形成されている。   Each of the lens surface 1R of the first lens 1 and the lens surface 2R of the second lens 2 has an antireflection structure 3a, 3b composed of a fine concavo-convex structure in which a plurality of fine portions having a pitch of a wavelength (visible light) or less are arranged. Is formed.

第１レンズ１のレンズ面１Ｆと第２レンズ２のレンズ面２Ｆには通常の誘電体による反射防止多層膜４ａ、４ｂが形成されている。   On the lens surface 1F of the first lens 1 and the lens surface 2F of the second lens 2, antireflection multilayer films 4a and 4b made of a normal dielectric are formed.

図３は、微細凹凸構造体３ａ、３ｂからなる反射防止構造体の要部概略図である。   FIG. 3 is a schematic view of a main part of an antireflection structure including the fine concavo-convex structures 3a and 3b.

図３において、酸化物の誘電体より成る微細部Ｒａの平均ピッチは可視域（波長４００ｎｍ〜波長７００ｎｍ）の波長以下であり、花弁のような構造をしている。   In FIG. 3, the average pitch of the fine portions Ra made of an oxide dielectric is less than or equal to the wavelength in the visible range (wavelength 400 nm to wavelength 700 nm), and has a petal-like structure.

この反射防止構造体はレンズを基盤７として、その一方の面に酸化アルミニウムを含有する材料からなり、平均ピッチが４００ｎｍ以下の微細部Ｒａを複数有する微細凹凸構造体３ａ、３ｂが平均厚さ３００ｎｍで形成されている。   This antireflection structure is made of a material containing aluminum oxide on one surface of a lens 7 as a base, and the fine concavo-convex structures 3a and 3b having a plurality of fine portions Ra having an average pitch of 400 nm or less have an average thickness of 300 nm. It is formed with.

微細凹凸構造体３ａ、３ｂの製法に関しては特許文献３と同様である。例えば微細凹凸構造体はスピンコート法により形成されたものである。   The manufacturing method of the fine concavo-convex structures 3a and 3b is the same as that of Patent Document 3. For example, the fine uneven structure is formed by a spin coating method.

微細凹凸構造体３ａ、３ｂの密度は基盤７近傍で最も高く、基盤７より離れ空気側にいくに従って密度が低くなる。   The density of the fine concavo-convex structure bodies 3a and 3b is the highest in the vicinity of the base 7, and the density decreases as it moves away from the base 7 toward the air side.

図４は、微細凹凸構造体３ａ、３ｂの断面厚み方向での有効屈折率の変化の説明図である。   FIG. 4 is an explanatory diagram of changes in the effective refractive index in the cross-sectional thickness direction of the fine concavo-convex structures 3a and 3b.

図４において膜厚０の位置は基板７側の面に相当する。有効屈折率は図４で示すように、密度と同様、基盤近傍で最大となり基盤から離れるに従って連続的に低くなり空気と接する面（膜厚Ｄａ）では空気の屈折率（＝１）と等しくなる。   In FIG. 4, the position where the film thickness is 0 corresponds to the surface on the substrate 7 side. As shown in FIG. 4, the effective refractive index is the maximum in the vicinity of the substrate and continuously decreases as the distance from the substrate becomes the same as the density, and is equal to the refractive index of air (= 1) on the surface in contact with air (film thickness Da). .

図８、図９は本実施例の微細凹凸構造体の入射角０度と入射角６０度のときの分光反射率の説明図である。   8 and 9 are explanatory diagrams of the spectral reflectance when the fine concavo-convex structure of the present example has an incident angle of 0 degrees and an incident angle of 60 degrees.

図８、図９に示すように、波長約５５０ｎｍ程度の使用波長の中心波長で最も良好な反射防止特性を示すとともに、可視光の全域において低い反射率となっている。また、図９に示すように入射角６０度でも反射率は低く入射角度特性も良好である。   As shown in FIGS. 8 and 9, the best antireflection characteristic is exhibited at the center wavelength of the used wavelength of about 550 nm, and the reflectance is low in the entire visible light region. Further, as shown in FIG. 9, even at an incident angle of 60 degrees, the reflectance is low and the incident angle characteristic is also good.

図２は鏡筒５へ第２レンズ２と第１レンズ１を挿入し、組み立てる際の方向を表す模式図である。   FIG. 2 is a schematic diagram showing directions when the second lens 2 and the first lens 1 are inserted into the lens barrel 5 and assembled.

鏡筒５は樹脂（熱可塑性樹脂）からなり、第２のレンズ２の面２Ｒには平均ピッチが波長以下の微細部より成る微細凹凸構造体３ｂが形成され、面２Ｒを進行方向側にして鏡筒５内に鏡筒５の一部より成るレンズ保持部５ａに当接するように挿入している。   The lens barrel 5 is made of a resin (thermoplastic resin), and the surface 2R of the second lens 2 is formed with a fine concavo-convex structure body 3b composed of fine portions having an average pitch of a wavelength or less, and the surface 2R is set in the traveling direction side. The lens barrel 5 is inserted so as to abut on a lens holding portion 5 a formed of a part of the lens barrel 5.

その際に、第２レンズ２と反対の面２Ｆをベルクランプ等の治具で面押しすることで第２レンズ２の光学軸が鏡筒５の光学軸に合致する様に装着される。   At that time, the surface 2F opposite to the second lens 2 is surface-pressed with a jig such as a bell clamp so that the optical axis of the second lens 2 is mounted so as to coincide with the optical axis of the barrel 5.

そして、第２レンズ２を鏡筒５のカシメ部５ｃに熱カシメして保持する。第２レンズ２自体を加工して時に生じた光学軸とレンズ外形寸法の差異は鏡筒５の塑性変形により吸収される。   Then, the second lens 2 is held in the caulking portion 5 c of the lens barrel 5 by heat caulking. The difference between the optical axis and the lens outer dimension that is sometimes generated by processing the second lens 2 itself is absorbed by the plastic deformation of the lens barrel 5.

それは、第２レンズ２のレンズ面２Ｆで面押しする際に、面との摺動により軸が揃う方向に力が加えられることになる。その力によって、鏡筒５がその方向に塑性変形させられるためである。   That is, when the surface is pressed by the lens surface 2F of the second lens 2, a force is applied in a direction in which the axes are aligned by sliding with the surface. This is because the lens barrel 5 is plastically deformed in that direction by the force.

第２レンズ２の面２Ｒに形成されている微細凹凸構造体は、該第２レンズ２の芯取り後に形成されたものである。   The fine concavo-convex structure formed on the surface 2 </ b> R of the second lens 2 is formed after the centering of the second lens 2.

第２レンズ２と同様に第１レンズ１は微細凹凸構造体３ａ側から鏡筒５に挿入している。このとき、鏡筒５の一部のレンズ保持部５ｂに当接するようにしている。また、その際に、それと反対の面１Ｆ側を面押しする事で第１レンズ１の光学軸が鏡筒５の光学軸に合致する様に熱カシメされて装着される。   Similar to the second lens 2, the first lens 1 is inserted into the lens barrel 5 from the fine concavo-convex structure 3a side. At this time, the lens holder 5 is in contact with a part of the lens holding portion 5b. At that time, the surface 1F side opposite to the surface 1F is surface-pressed so that the optical axis of the first lens 1 is heat caulked so as to coincide with the optical axis of the lens barrel 5.

これにより、第１レンズ１と第２レンズ２の光軸同士を揃えている。   Thereby, the optical axes of the first lens 1 and the second lens 2 are aligned.

以上のように本実施例によれば、反射防止機能を有する微細凹凸構造体（反射防止素子）を形成したレンズ（光学素子）を鏡筒内に偏心誤差の軽減を図りつつ、高精度に保持することができる。   As described above, according to this embodiment, the lens (optical element) on which the fine concavo-convex structure (antireflection element) having the antireflection function is formed is held in the lens barrel with high accuracy while reducing the eccentric error. can do.

この結果、光学素子を鏡筒に組立保持する際の偏心敏感度の高い光学系においても、光学性能を良好に維持しつつ、鏡筒のレンズ保持部に保持することができる。   As a result, even in an optical system having a high degree of eccentricity sensitivity when the optical element is assembled and held in the lens barrel, it can be held in the lens holding portion of the lens barrel while maintaining good optical performance.

このレンズ鏡筒を用いれば、フレアやゴーストの少ない良好な光学系が得られる。   By using this lens barrel, a good optical system with little flare and ghost can be obtained.

図５は本発明の実施例２のレンズ鏡筒の要部構成図である。   FIG. 5 is a configuration diagram of the main part of the lens barrel of the second embodiment of the present invention.

図５において、１０２はレンズ鏡筒であり、第１のレンズ１と第２のレンズ２と第１の鏡筒６ａと、第２の鏡筒６ｂを有している。   In FIG. 5, reference numeral 102 denotes a lens barrel, which has a first lens 1, a second lens 2, a first lens barrel 6a, and a second lens barrel 6b.



第１レンズ１のレンズ面１Ｆと第２レンズ２のレンズ面２Ｆにはそれぞれ、実施例１と同様な平均ピッチが波長以下のピッチより成る微細部を複数配列した微細凹凸構造体からなる反射防止構造体３ａ、３ｂが形成されている。

Each of the lens surface 1F of the first lens 1 and the lens surface 2F of the second lens 2 has an antireflection structure composed of a fine concavo-convex structure in which a plurality of fine portions each having an average pitch equal to or smaller than the wavelength is arranged. Structures 3a and 3b are formed.

第１レンズ１のレンズ面１Ｒと第２レンズ２のレンズ面２Ｒには通常の誘電体による反射防止多層膜が配置されている。   On the lens surface 1R of the first lens 1 and the lens surface 2R of the second lens 2, an antireflection multilayer film made of a normal dielectric is disposed.

微細凹凸構造体３ａ、３ｂからなる反射防止構造体は実施例１と同様である。即ち、酸化物の誘電体より成る微細部は、その平均ピッチが可視光の波長以下であり、花弁のような構造をしている。   The antireflection structure composed of the fine concavo-convex structures 3a and 3b is the same as that of the first embodiment. That is, the fine portion made of an oxide dielectric has an average pitch equal to or less than the wavelength of visible light and has a petal-like structure.

第１、第２鏡筒６ａ、６ｂは樹脂からなる。本実施例では、図６に示すように、第１のレンズ１を微細凹凸構造体３ａが形成された面１Ｆを進行方向側にして、第１の鏡筒６ａにレンズ保持部６ａ１に当接するまで挿入している。その際に、それと反対の面１Ｒを面押しする事で第１レンズ１の光学軸が第１の鏡筒６ａの光学軸に合致する様にカシメ部６ａ２に熱カシメして装着される。   The first and second lens barrels 6a and 6b are made of resin. In this embodiment, as shown in FIG. 6, the first lens 1 is brought into contact with the lens holding portion 6a1 on the first lens barrel 6a with the surface 1F on which the fine concavo-convex structure 3a is formed in the traveling direction. Is inserted. At that time, by pressing the opposite surface 1R, the first lens 1 is attached to the crimping portion 6a2 by heat caulking so that the optical axis of the first lens 1 coincides with the optical axis of the first lens barrel 6a.

実施例１と同様に、第１レンズ１自体を加工して時に生じた光学軸とレンズ外形寸法の差異は第１の鏡筒６ａの塑性変形により吸収される。   Similar to the first embodiment, the difference between the optical axis and the lens outer dimension generated when the first lens 1 itself is processed is absorbed by plastic deformation of the first lens barrel 6a.

同様に第２のレンズ２は微細凹凸構造体３ｂが形成されている面２Ｆを進行方向側にして第２の鏡筒６ｂにレンズ保持部６ｂ１に当接するように挿入している。   Similarly, the second lens 2 is inserted into the second lens barrel 6b so as to contact the lens holding portion 6b1 with the surface 2F on which the fine concavo-convex structure 3b is formed in the traveling direction.

第１の鏡筒６ａと第２の鏡筒６ｂは図７に示すように勘合される。これにより、第１のレンズ１と第２のレンズ２の光軸同士も揃えることができるレンズ鏡筒１０２を得ている。   The first lens barrel 6a and the second lens barrel 6b are fitted as shown in FIG. As a result, a lens barrel 102 that can align the optical axes of the first lens 1 and the second lens 2 is obtained.

以上の構成により、実施例１と同様の効果を有するレンズ鏡筒を得ている。   With the above configuration, a lens barrel having the same effect as in the first embodiment is obtained.

次に本発明のレンズ鏡筒を用いたデジタルスチルカメラ（撮像装置）（光学機器）の実施例を、図１０を用いて説明する。   Next, an embodiment of a digital still camera (imaging device) (optical apparatus) using the lens barrel of the present invention will be described with reference to FIG.

図１０において２０はカメラ本体、２１は本発明のレンズ鏡筒を用いた光学系（撮影光学系）である。２２はカメラ本体に内蔵され、撮影光学系２１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）である。   In FIG. 10, 20 is a camera body, and 21 is an optical system (photographing optical system) using the lens barrel of the present invention. Reference numeral 22 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the photographing optical system 21 and is built in the camera body.

２３は撮像素子２２によって光電変換された被写体像に対応する情報を記録するメモリ、２４は液晶ディスプレイパネルなどによって構成され、固体撮像素子２２上に形成された被写体像を観察するためのファインダーである。   Reference numeral 23 denotes a memory for recording information corresponding to the subject image photoelectrically converted by the image sensor 22, and reference numeral 24 denotes a finder configured by a liquid crystal display panel or the like for observing the subject image formed on the solid-state image sensor 22. .

このように本発明のレンズ鏡筒をデジタルスチルカメラなどの撮像装置の光学系に適用することにより、高い光学性能を有する撮像装置を実現している。   In this way, by applying the lens barrel of the present invention to an optical system of an imaging apparatus such as a digital still camera, an imaging apparatus having high optical performance is realized.

本発明の実施例１のレンズ鏡筒の要部断面図Sectional drawing of the principal part of the lens barrel of Example 1 of the present invention 鏡筒へレンズを挿入する際の方向を表す模式図Schematic showing the direction when inserting the lens into the lens barrel 微細凹凸構造体からなる反射防止構造体を示す模式図Schematic diagram showing an antireflection structure consisting of a fine relief structure 微細凹凸構造体の屈折率の断面を示す模式図Schematic showing the cross section of the refractive index of the fine relief structure 本発明の実施例２のレンズ鏡筒の要部断面図Sectional drawing of the principal part of the lens barrel of Example 2 of this invention 鏡筒へレンズを挿入する際の方向を表す模式図Schematic showing the direction when inserting the lens into the lens barrel 鏡筒同士の勘合を示す模式図Schematic diagram showing fitting between lens barrels 反射防止構造体の入射角０度に対する反射率の分光特性Spectral characteristics of reflectance for incident angle 0 degree of antireflection structure 反射防止構造体の入射角６０度に対する反射率の分光特性Spectral characteristics of reflectance with respect to an incident angle of 60 degrees of the antireflection structure 本発明の光学機器の要部断面図Sectional drawing of the principal part of the optical apparatus of the present invention

符号の説明Explanation of symbols

１：第１のレンズ
２：第２のレンズ
３ａ：微細凹凸構造体
３ｂ：微細凹凸構造体
４ａ：誘電体による反射防止多層膜
４ｂ：誘電体による反射防止多層膜
５ａ：レンズ保持部
５ｂ：レンズ保持部
６ａ：第１のレンズ鏡筒
６ｂ：第２のレンズ鏡筒
６ａａ：レンズ保持部
６ｂｂ：レンズ保持部
７：基板
２０：カメラ本体
２１：撮影光学系
１０１：レンズ鏡筒
１０２：レンズ鏡筒
Ｒ：微細凹凸構造体 1: first lens 2: second lens 3a: fine uneven structure 3b: fine uneven structure 4a: antireflection multilayer film 4b made of dielectric material: antireflection multilayer film 5a made of dielectric material: lens holding portion 5b: lens Holding unit 6a: first lens barrel 6b: second lens barrel 6aa: lens holding unit 6bb: lens holding unit 7: substrate 20: camera body 21: photographing optical system 101: lens barrel 102: lens barrel R: Fine uneven structure

Claims (9)

一方の面の最表面に波長以下の微細構造からなる凹凸が形成された反射防止素子を有する光学素子と、
該光学素子を保持するレンズ保持構造を有するレンズ鏡筒であって、
該光学素子は、その微細構造の面を進行方向側にして突き当てで挿入されている事を特徴とするレンズ鏡筒。 An optical element having an antireflection element in which irregularities having a fine structure of a wavelength or less are formed on the outermost surface of one surface;
A lens barrel having a lens holding structure for holding the optical element,
A lens barrel, wherein the optical element is inserted by abutment with the surface of the fine structure thereof in the traveling direction. レンズ保持構造は熱可塑性樹脂から成り、
前記光学素子は、熱カシメによりレンズ保持構造に保持されており、
熱カシメによるカシメ部は、
前記鏡筒の一部であって、該光学素子の微細構造の面を進行方向側にして圧入する形状より成る事を特徴とする請求項１のレンズ鏡筒。 The lens holding structure is made of thermoplastic resin,
The optical element is held in the lens holding structure by heat caulking,
The caulking part by heat caulking
2. The lens barrel according to claim 1, wherein the lens barrel is a part of the lens barrel and is press-fitted with the fine structure surface of the optical element in the traveling direction. 前記凹凸は、スピンコート法によって形成されたものである事を特徴とする請求項２のレンズ鏡筒。   The lens barrel according to claim 2, wherein the unevenness is formed by a spin coating method. 前記光学素子は微細構造からなる反射防止素子を形成する前に、芯取りをされたものである事を特徴とする請求項３のレンズ鏡筒。   4. The lens barrel according to claim 3, wherein the optical element is centered before forming an antireflection element having a fine structure. 光入出射面の一方の面に、平均ピッチが可視域の波長以下で凹凸形状の微細部を複数有し、反射防止機能を有する微細凹凸構造体を有する光学素子が鏡筒内に保持されているレンズ鏡筒であって、
該光学素子は、該微細凹凸構造体が形成されている面、又は該面側の一部が該鏡筒のレンズ保持部に当接するように挿入されて該鏡筒内に保持されていることを特徴とするレンズ鏡筒。 An optical element having a fine concavo-convex structure having an antireflection function is held in the lens barrel, on one surface of the light incident / exit surface, which has a plurality of concavo-convex fine portions having an average pitch equal to or less than a visible wavelength. A lens barrel,
The optical element is inserted and held in the lens barrel so that the surface on which the fine concavo-convex structure is formed or a part of the surface is in contact with the lens holding portion of the lens barrel A lens barrel characterized by 前記鏡筒は、熱可塑性樹脂から成り、前記光学素子は該鏡筒のカシメ部で熱カシメされて保持されていることを特徴とする請求項５のレンズ鏡筒。   6. The lens barrel according to claim 5, wherein the lens barrel is made of a thermoplastic resin, and the optical element is held by being caulked by a caulking portion of the lens barrel. 前記光学素子に形成されている前記微細凹凸構造体はスピンコート法により形成されたものであることを特徴とする請求項５又は６のレンズ鏡筒。   The lens barrel according to claim 5 or 6, wherein the fine concavo-convex structure formed on the optical element is formed by a spin coating method. 前記光学素子に形成されている前記微細凹凸構造体は、該光学素子の芯取り後に形成されたものであることを特徴とする請求項５、６又は７のレンズ鏡筒。   The lens barrel according to claim 5, 6 or 7, wherein the fine concavo-convex structure formed on the optical element is formed after centering the optical element. 請求項１乃至８のいずれか１項のレンズ鏡筒を有することを特徴とする光学機器。   An optical apparatus comprising the lens barrel according to claim 1.
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