JP4285153B2 - Lens device - Google Patents

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JP4285153B2
JP4285153B2 JP2003300719A JP2003300719A JP4285153B2 JP 4285153 B2 JP4285153 B2 JP 4285153B2 JP 2003300719 A JP2003300719 A JP 2003300719A JP 2003300719 A JP2003300719 A JP 2003300719A JP 4285153 B2 JP4285153 B2 JP 4285153B2
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lens
caulking
side wall
caulking portion
front surface
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JP2005070471A (en
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直志 大野
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Sony Corp
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Sony Corp
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Description

本発明はレンズ装置に関する。   The present invention relates to a lens apparatus.

従来から、レンズが熱可塑性樹脂からなる鏡筒に熱カシメによって保持されるレンズ装置が提供されている（例えば特許文献１参照）。
このようなレンズ装置では、前記鏡筒は、前記レンズの外周端面が嵌合される円筒状の側壁と、前記側壁の幅方向の一端で周方向に間隔をおいた３箇所から該側壁の半径方向内側に突設され前記レンズの一方の面の外周部に臨む３つの基準面とを有している。
そして、前記側壁の幅方向の他端がその全周にわたって熱カシメにより該側壁の半径方向内側に変形され前記レンズの他方の面の外周部に当接したカシメ部が形成され、前記レンズは前記カシメ部と前記３つの基準面との間に挟まれることで鏡筒に保持されている。
特許第２６７９７８４号 2. Description of the Related Art Conventionally, there has been provided a lens device in which a lens is held by heat caulking on a lens barrel made of a thermoplastic resin (see, for example, Patent Document 1).
In such a lens apparatus, the lens barrel has a cylindrical side wall from which the outer peripheral end surface of the lens is fitted, and a radius of the side wall from three locations spaced circumferentially at one end in the width direction of the side wall. And three reference surfaces that protrude inward in the direction and face the outer peripheral portion of one surface of the lens.
Then, the other end in the width direction of the side wall is deformed radially inward of the side wall by thermal caulking to form a caulking portion in contact with the outer peripheral portion of the other surface of the lens, The lens barrel is held between the caulking portion and the three reference planes so as to be held by the lens barrel.
Japanese Patent No. 2679784

しかしながら上述のレンズ装置では、前記３つの基準面に当て付けられていないレンズ箇所もカシメ部による応力を受けることになるため、レンズの剛性が低い場合にはレンズに歪みが生じ光学的性能が低下するおそれがある。
本発明はこのような事情に鑑みなされたものであり、本発明の目的はレンズの光学性能に影響を与えることないレンズ装置を提供することにある。 However, in the lens device described above, since the lens portion that is not applied to the three reference surfaces is also subjected to stress due to the caulking portion, if the rigidity of the lens is low, the lens is distorted and the optical performance is degraded. There is a risk.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens apparatus that does not affect the optical performance of the lens.

上述の目的を達成するため、本発明のレンズ装置は、レンズと、該レンズを保持する熱可塑性樹脂からなる鏡筒とを備え、前記鏡筒は、前記レンズの外周端面が嵌合される円筒状の側壁と、前記側壁の幅方向の一端で周方向に間隔をおいた３箇所から該側壁の半径方向内側に突設され前記レンズの一方の面の外周部に臨み同一面上に位置する３つの基準面とを有し、前記側壁の幅方向の他端がその全周にわたって熱カシメにより該側壁の半径方向内側に変形されてカシメ部が形成され、前記レンズが前記カシメ部と前記３つの基準面との間に挟まれることにより前記レンズが鏡筒により保持されるレンズ装置であって、前記カシメ部のうち前記３つの基準面に対応する３箇所は前記レンズの他方の面の外周部に当接するまで変形された第１カシメ部として形成され、かつ、前記カシメ部のうち前記第１カシメ部以外の部分は前記レンズの他方の面との間に間隙が確保された第２カシメ部として形成されていることを特徴とする。   In order to achieve the above object, a lens device of the present invention includes a lens and a lens barrel made of a thermoplastic resin that holds the lens, and the lens barrel is a cylinder into which an outer peripheral end surface of the lens is fitted. The side wall and one end of the side wall in the width direction project from the circumferentially spaced side to the inner side in the radial direction of the side wall and face the outer peripheral part of one surface of the lens and are located on the same plane And the other end in the width direction of the side wall is deformed radially inward of the side wall by thermal caulking to form a caulking portion, and the lens includes the caulking portion and the 3 A lens device in which the lens is held by a lens barrel by being sandwiched between two reference surfaces, and three of the caulking portions corresponding to the three reference surfaces are the outer periphery of the other surface of the lens The first cap deformed until it comes into contact with the part And a portion other than the first caulking portion of the caulking portion is formed as a second caulking portion in which a gap is ensured with the other surface of the lens. To do.

そのため、本発明によれば、鏡筒のカシメ部のうち３つの基準面に対応する３箇所はレンズの他方の面の外周部に当接するまで変形された第１カシメ部として形成され、かつ、カシメ部のうち第１カシメ部以外の部分はレンズの他方の面との間に間隙が確保された第２カシメ部として形成されるので、３つの基準面に当て付けられていないレンズ箇所は、カシメ部による応力を受けることがないため、レンズの剛性が低くても歪みを生じることなく、光学的性能の低下を確実に防止することができる。   Therefore, according to the present invention, of the caulking portions of the lens barrel, three portions corresponding to the three reference surfaces are formed as the first caulking portions that are deformed until they contact the outer peripheral portion of the other surface of the lens, and Of the caulking portion, the portion other than the first caulking portion is formed as a second caulking portion in which a gap is secured with the other surface of the lens. Since stress due to the caulking portion is not received, the optical performance can be reliably prevented from deteriorating without causing distortion even if the rigidity of the lens is low.

レンズの光学性能に影響を与えないという目的を、鏡筒のカシメ部に第１カシメ部と第２カシメ部を設けることによって実現した。   The object of not affecting the optical performance of the lens is realized by providing the first caulking part and the second caulking part in the caulking part of the lens barrel.

次に本発明の実施例１について図面を参照して説明する。
図１は実施例１のレンズ装置の構成を示す縦断面図、図２は第２レンズ２０および第２側壁部３４部分を示す斜視図、図３は鏡筒３０の平面図である。
図１に示すように、レンズ装置１００は、第１レンズ１０と、第２レンズ２０と、これら第１、第２レンズ１０、２０を保持する熱可塑性樹脂からなる鏡筒３０とを備えている。熱可塑性樹脂としては例えばポリカーボネートやＰＰＳ（ポリフェニレンサルファイド）などを用いることができる。
鏡筒３０は、前方に位置する側壁部３２と、後方に位置する側壁部３４とを有している。 Next, Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing the configuration of the lens apparatus of Example 1, FIG. 2 is a perspective view showing the second lens 20 and the second side wall portion 34, and FIG. 3 is a plan view of the lens barrel 30.
As shown in FIG. 1, the lens device 100 includes a first lens 10, a second lens 20, and a lens barrel 30 made of a thermoplastic resin that holds the first and second lenses 10 and 20. . For example, polycarbonate or PPS (polyphenylene sulfide) can be used as the thermoplastic resin.
The lens barrel 30 has a side wall portion 32 positioned in the front and a side wall portion 34 positioned in the rear.

前方の側壁部３２には、第１レンズ１０の外周端面が嵌合される円筒状の側壁３２０２と、側壁３２０２の幅方向の後端で周方向に間隔をおいた３箇所から該側壁３２０２の半径方向内側に突設された３つの基準面３２０４と、側壁３２０２の幅方向の前端がその全周にわたって熱カシメにより側壁部３２の半径方向内側に変形されて形成されたカシメ部３２０６を有している。
第１レンズ１０は、外周端面が側壁３２０２に嵌合され、後面の外周部の３箇所がそれぞれ３つの基準面３２０４に当接され、前面の外周部の全周にカシメ部３２０６が当て付けられ、カシメ部３２０６と基準面３２０４との間に挟まれることにより鏡筒３０に保持されている。 A cylindrical side wall 3202 to which the outer peripheral end face of the first lens 10 is fitted, and three side walls 3202 spaced from each other at the rear end in the width direction of the side wall 3202 are provided on the front side wall 32. Three reference surfaces 3204 projecting radially inward, and a crimping portion 3206 formed by deforming the front end in the width direction of the side wall 3202 to the inner side in the radial direction of the side wall portion 32 by thermal caulking. ing.
The first lens 10 has an outer peripheral end face fitted into the side wall 3202, three positions on the outer peripheral portion of the rear surface are in contact with the three reference surfaces 3204, and the crimping portion 3206 is applied to the entire outer periphery of the front surface. The lens barrel 30 is held between the crimping portion 3206 and the reference surface 3204.

第２レンズ２０は後方の側壁部３４に保持されており、本実施例では第２レンズ２０および側壁部３４に本発明が適用されている。
第２レンズ２０は、後面２２（一方の面）が凹面で形成され前面２４（他方の面）が凸面で形成されたメニスカスレンズであり、第２レンズ２０の中心の厚さは外周部の厚さよりも大きい寸法で形成されている。本実施例では、例えば、第２レンズ２０の外径は１０ｍｍ以上３０ｍｍ以下、中心の厚さは１．５ｍｍ以上３ｍｍ以下、外周部の厚さは０．５ｍｍ以上１ｍｍ以下となっており、第１レンズ１０に比較して剛性が低いものとなっている。
また、第２レンズ２０の後面２２の外周部は平面で形成されている。 The second lens 20 is held by the rear side wall 34, and the present invention is applied to the second lens 20 and the side wall 34 in this embodiment.
The second lens 20 is a meniscus lens in which the rear surface 22 (one surface) is formed as a concave surface and the front surface 24 (the other surface) is formed as a convex surface, and the thickness of the center of the second lens 20 is the thickness of the outer peripheral portion. It is formed with a size larger than this. In this embodiment, for example, the outer diameter of the second lens 20 is 10 mm or more and 30 mm or less, the thickness of the center is 1.5 mm or more and 3 mm or less, and the thickness of the outer peripheral portion is 0.5 mm or more and 1 mm or less. The rigidity is lower than that of one lens 10.
Further, the outer peripheral portion of the rear surface 22 of the second lens 20 is formed as a flat surface.

後方の側壁部３４には、第２レンズ２０の外周端面が嵌合される円筒状の側壁３４０２と、側壁３４０２の幅方向の後端で周方向に間隔をおいた３箇所から該側壁３４０２の半径方向内側に突設された３つの基準面３４０４と、側壁３４０２の幅方向の前端がその全周にわたって熱カシメにより側壁部３４の半径方向内側に変形されて形成されたカシメ部３４０６を有している。
３つの基準面３４０４は、同一平面上に延在するように形成されている。
環板状に延在するカシメ部３４０６のうち３つの基準面３４０４に対応する３箇所は第２レンズ２０の前面２４の外周部に当接するまで変形された第１カシメ部３４０６Ａとして形成されている。
また、カシメ部３４０６のうち第１カシメ部３４０６Ａ以外の部分は第２レンズ２０の前面２４との間に間隙Ｓが確保された第２カシメ部３４０６Ｂとして形成されている。本実施例では、間隙Ｓは例えば０．１ｍｍ程度である。
また、第１カシメ部３４０６Ａと第２カシメ部３４０６Ｂの先端（半径方向の内側に位置する端部）は同一円周上に位置するように設けられている。
図２に示すように、第２レンズ２０は、外周端面が側壁３４０２に嵌合され、後面２２の外周部の３箇所がそれぞれ３つの基準面３４０４に当接され、３つの第１カシメ部３４０６Ａが第２レンズ２０の前面２４の外周部に当て付けられ、３つの第１カシメ部３４０６Ａと３つの基準面３４０４との間に挟まれることにより鏡筒３０に保持されている。
なお、第２レンズ２０の前面の前方から見たときに第１カシメ部３４０６Ａと第２カシメ部３４０６Ｂとの境の部分に間隙Ｓに対応した段差Ｄが形成されているが、図９に示すように、第２レンズ２０の光軸と直交する平面に対する第１カシメ部３４０６Ａの前面の外周部３４０６Ａ１の傾斜角度よりも第２カシメ部３４０６Ｂの前面の外周部３８０４Ｂ１の傾斜角度を小さくすることにより、段差Ｄが肉眼によって判別できない程度の形状で形成されている。
より詳細に説明すると、カシメ部３４０６は第２レンズ２０の前面２４に臨む後面と、第２レンズ２０の前面２４の前方に臨む前面とを備えており、第１カシメ部３４０６Ａの後面が第２レンズ２０の前面２４に当接され、第２カシメ部３４０６Ｂの後面と第２レンズ２０の前面２４との間には間隙Ｓが確保されている。また、第１カシメ部３４０６Ａの前面と第２カシメ部３４０６Ｂの前面とは第２レンズ２０の半径方向外方に至るにつれて第２レンズ２０の光軸と直交する平面に対して離れるように傾斜して形成されている。そして、第２レンズ２０の光軸と直交する平面に対する第２カシメ部３４０６Ｂの前面の傾斜角度は、第２レンズ２０の光軸と直交する平面に対する第１カシメ部３４０６Ａの前面の傾斜角度よりも小さくなるように形成されている。このような第１カシメ部３４０６Ａの前面および第２カシメ部３４０６Ｂの前面の形状によって段差Ｄが肉眼によって判別できないようになっている。 The rear side wall 34 has a cylindrical side wall 3402 to which the outer peripheral end surface of the second lens 20 is fitted, and the side wall 3402 from three locations spaced in the circumferential direction at the rear end in the width direction of the side wall 3402. Three reference surfaces 3404 projecting radially inward, and a crimping portion 3406 formed by deforming the front end in the width direction of the side wall 3402 to the inside in the radial direction of the side wall portion 34 by thermal caulking. ing.
The three reference surfaces 3404 are formed so as to extend on the same plane.
Of the caulking portions 3406 extending in the shape of a ring plate, three portions corresponding to the three reference surfaces 3404 are formed as first caulking portions 3406A that are deformed until they contact the outer peripheral portion of the front surface 24 of the second lens 20. .
Further, the portion other than the first caulking portion 3406A in the caulking portion 3406 is formed as a second caulking portion 3406B in which a gap S is ensured between the front surface 24 of the second lens 20. In this embodiment, the gap S is about 0.1 mm, for example.
In addition, the tips of the first caulking portion 3406A and the second caulking portion 3406B (ends located on the inside in the radial direction) are provided so as to be located on the same circumference.
As shown in FIG. 2, the outer peripheral end surface of the second lens 20 is fitted to the side wall 3402, and the three outer peripheral portions of the rear surface 22 are brought into contact with the three reference surfaces 3404, respectively, and three first caulking portions 3406A are provided. Is applied to the outer peripheral portion of the front surface 24 of the second lens 20 and is held by the lens barrel 30 by being sandwiched between the three first caulking portions 3406A and the three reference surfaces 3404.
A step D corresponding to the gap S is formed at the boundary between the first caulking portion 3406A and the second caulking portion 3406B when viewed from the front of the front surface of the second lens 20, as shown in FIG. Thus, by making the inclination angle of the outer peripheral portion 3804B1 of the front surface of the second caulking portion 3406B smaller than the inclination angle of the outer peripheral portion 3406A1 of the front surface of the first caulking portion 3406A with respect to the plane orthogonal to the optical axis of the second lens 20 The step D is formed in a shape that cannot be distinguished by the naked eye.
More specifically, the caulking portion 3406 includes a rear surface facing the front surface 24 of the second lens 20 and a front surface facing the front of the front surface 24 of the second lens 20, and the rear surface of the first caulking portion 3406 </ b> A is a second surface. A gap S is secured between the rear surface of the second caulking portion 3406 </ b> B and the front surface 24 of the second lens 20 in contact with the front surface 24 of the lens 20. In addition, the front surface of the first caulking portion 3406A and the front surface of the second caulking portion 3406B are inclined so as to be separated from the plane orthogonal to the optical axis of the second lens 20 as they go outward in the radial direction of the second lens 20. Is formed. The inclination angle of the front surface of the second caulking portion 3406B with respect to the plane orthogonal to the optical axis of the second lens 20 is greater than the inclination angle of the front surface of the first caulking portion 3406A with respect to the plane orthogonal to the optical axis of the second lens 20. It is formed to be smaller. Due to the shape of the front surface of the first caulking portion 3406A and the front surface of the second caulking portion 3406B, the step D cannot be discriminated with the naked eye.

次に、レンズ装置１００の組立方法について説明する。
図４は熱カシメ治具の縦断面図、図５は図４のＡ矢視図、図６（Ａ）は図５のＸＸ線断面図、図６（Ｂ）は図５のＹＹ線断面図、図７は第１カシメ部の説明図、図８は第２カシメ部の説明図、図９はカシメ動作の説明図である。
まず、第２レンズ２０を、その後面２２を鏡筒３０の基準面３４０４に臨ませつつ、第２レンズ２０の外周端面を側壁３４０２に嵌合させ、後面２２の外周部の３箇所をそれぞれ３つの基準面３４０４に当て付ける。
次いで、図４、図５に示す熱カシメ治具２００によって側壁３４０２を熱カシメし、第１カシメ部３４０６Ａと第２カシメ部３４０６Ｂを形成する。
さらに詳しく説明すると、図４、図５に示すように、熱カシメ治具２００の本体２０１の前部には、第２側壁部３４の側壁３４０２と同じ半径を有する円筒状壁部２０２が全周にわたって形成されている。熱カシメ治具２００は、不図示のヒータなどからなる加熱手段によって円筒状壁部２０２が鏡筒２０の第２側壁部３８を溶融する程度の温度に加熱されている。なお、符号２０１Ａは、温度測定用センサを配設するための孔を示しており、符号２０１Ｂは軽量化を図るための肉抜き用の孔を示している。
図６に示すように、円筒状壁部２０２の先端端面には、側壁３４０２の前端を溶融することで第１カシメ部３８０２Ａを形成する３つの第１加熱部２０４と、側壁３４０２の前端を溶融することで第２カシメ部３８０４Ｂを形成する３つの第２加熱部２０６とが設けられている。 Next, a method for assembling the lens apparatus 100 will be described.
4 is a longitudinal sectional view of the heat caulking jig, FIG. 5 is a sectional view taken along arrow A in FIG. 4, FIG. 6A is a sectional view taken along line XX in FIG. 5, and FIG. 6B is a sectional view taken along line YY in FIG. FIG. 7 is an explanatory diagram of the first caulking unit, FIG. 8 is an explanatory diagram of the second caulking unit, and FIG. 9 is an explanatory diagram of the caulking operation.
First, with the rear surface 22 of the second lens 20 facing the reference surface 3404 of the lens barrel 30, the outer peripheral end surface of the second lens 20 is fitted to the side wall 3402, and three portions of the outer peripheral portion of the rear surface 22 are respectively 3 Applied to two reference planes 3404.
Next, the side cask 3402 is caulked by the thermal caulking jig 200 shown in FIGS. 4 and 5 to form the first caulking portion 3406A and the second caulking portion 3406B.
More specifically, as shown in FIGS. 4 and 5, a cylindrical wall portion 202 having the same radius as the side wall 3402 of the second side wall portion 34 is provided at the front portion of the main body 201 of the heat caulking jig 200. Is formed over. The heat caulking jig 200 is heated to a temperature at which the cylindrical wall 202 melts the second side wall 38 of the lens barrel 20 by a heating means such as a heater (not shown). Reference numeral 201A indicates a hole for disposing a temperature measurement sensor, and reference numeral 201B indicates a lightening hole for reducing the weight.
As shown in FIG. 6, the first end of the cylindrical wall 202 is melted at the front end of the side wall 3402 by melting the front end of the side wall 3402 to form the first caulking part 3802A and the first end of the side wall 3402. Thus, three second heating parts 206 that form the second caulking part 3804B are provided.

熱カシメ治具２００による側壁３４０２の熱カシメは次のようになされる。
すなわち、熱カシメ治具２００は、円筒状壁部２０２の前端が側壁３４０２に臨んだ状態で、３つの第１加熱部２０４が３つの基準面３４０４のそれぞれに対向するように位置決めされ、その状態で熱カシメ治具２００が側壁３４０２に押圧される。
これにより、図７に示すように第１加熱部２０４によって側壁３４０２が熱カシメされ、図９に示すように側壁３４０２が（イ）の状態から（ロ）の状態に変形され、カシメ部３４０６のうち３つの基準面３４０４に対応する３箇所は第２レンズ２０の前面２４の外周部に当接するまで変形された第１カシメ部３４０６Ａとして形成される。
また、図８に示すように第２加熱部２０６によって側壁３４０２が熱カシメされ、図９に示すように側壁３４０２が（イ）の状態から（ハ）の状態に変形され、カシメ部３４０６のうち第１カシメ部３４０６Ａ以外の部分が第２レンズ２０の前面２４との間に間隙Ｓが確保された第２カシメ部３４０６Ｂとして形成される。
これにより第２レンズ２０は、３つの第１カシメ部３４０６Ａと３つの基準面３４０４との間に挟まれることにより鏡筒３０に保持される。
この際、カシメ部３４０６は、第１、第２加熱部２０４、２０６の形状によって、光軸と直交する平面に対する第１カシメ部３４０６Ａの前面の外周部３４０６Ａ１の傾斜角度よりも第２カシメ部３４０６Ｂの前面の外周部３８０４Ｂ１の傾斜角度が小さくなるように熱カシメされるため、図９に斜線で示す側壁３４の上部半径方向外側部分３４Ｘが図９に斜線で示す第２カシメ部３４０６Ｂの半径方向外側部分３４Ｙに移り、これにより段差Ｄが肉眼によって判別できない程度の形状で形成されることになる。 The heat caulking of the side wall 3402 by the heat caulking jig 200 is performed as follows.
That is, the heat caulking jig 200 is positioned such that the three first heating parts 204 face the three reference surfaces 3404 in a state where the front end of the cylindrical wall part 202 faces the side wall 3402. Thus, the heat caulking jig 200 is pressed against the side wall 3402.
As a result, the side wall 3402 is thermally crimped by the first heating unit 204 as shown in FIG. 7, and the side wall 3402 is deformed from the state (A) to the state (B) as shown in FIG. Of these, three portions corresponding to the three reference surfaces 3404 are formed as first caulking portions 3406A that are deformed until they contact the outer peripheral portion of the front surface 24 of the second lens 20.
Further, as shown in FIG. 8, the side wall 3402 is caulked by the second heating unit 206, and as shown in FIG. 9, the side wall 3402 is deformed from the state (A) to the state (C). A portion other than the first caulking portion 3406A is formed as a second caulking portion 3406B in which a gap S is secured between the front surface 24 of the second lens 20.
Thus, the second lens 20 is held by the lens barrel 30 by being sandwiched between the three first caulking portions 3406A and the three reference surfaces 3404.
At this time, the caulking portion 3406 has a second caulking portion 3406B that is larger than the inclination angle of the outer peripheral portion 3406A1 of the front surface of the first caulking portion 3406A with respect to the plane orthogonal to the optical axis, depending on the shapes of the first and second heating portions 204 and 206. 9 is heat caulked so that the inclination angle of the outer peripheral portion 3804B1 of the front surface is small, so that the upper radial outer portion 34X of the side wall 34 shown by hatching in FIG. 9 is in the radial direction of the second caulking portion 3406B shown by hatching in FIG. Moving to the outer portion 34Y, the step D is formed in a shape that cannot be discriminated by the naked eye.

次に、第１レンズ１０を、その後面を鏡筒３０の基準面３２０４に臨ませつつ、第１レンズ１０の外周端面を側壁３２０２に嵌合させ、前記後面の外周部の３箇所をそれぞれ３つの基準面３２０４に当て付ける。
次いで、第２レンズ２０の場合と同様に不図示の熱カシメ治具によって側壁３２０２を熱カシメし、カシメ部３２０６を形成する。そして、第１レンズ１０は、カシメ部３２０６と３つの基準面３２０４との間に挟まれることにより鏡筒３０に保持される。 Next, with the rear surface of the first lens 10 facing the reference surface 3204 of the lens barrel 30, the outer peripheral end surface of the first lens 10 is fitted into the side wall 3202, and three portions of the outer peripheral portion of the rear surface are respectively 3 Applied to two reference planes 3204.
Next, as in the case of the second lens 20, the side wall 3202 is caulked with a heat caulking jig (not shown) to form a caulking portion 3206. The first lens 10 is held by the lens barrel 30 by being sandwiched between the crimping portion 3206 and the three reference surfaces 3204.

本実施例によれば、鏡筒３０のカシメ部３４０６のうち３つの基準面３４０４に対応する３箇所は第２レンズ２０の前面２４の外周部に当接するまで変形された第１カシメ部３４０６Ａとして形成され、かつ、カシメ部３４０６のうち第１カシメ部３４０６Ａ以外の部分は第２レンズ２０の前面２４との間に間隙Ｓが確保された第２カシメ部３４０６Ｂとして形成されるので、３つの基準面３４０４に当て付けられていない第２レンズ２０箇所は、カシメ部による応力を受けることがないため、第２レンズ２０の剛性が低くても歪みを生じることなく、光学的性能の低下を確実に防止することができる。
また、側壁３４の全周にわたってカシメ部３４０６が形成されるため、側壁３４がその周方向において部分的に熱カシメされる場合に比較して第２レンズ２０に加わる応力のバランスが均一化され、第２レンズ２０の歪みを防止する上で有利となる。
また、鏡筒３０の側壁３４の第１カシメ部３４０６Ａと第２カシメ部３４０６Ｂは段差Ｄが肉眼によって判別できない程度の形状で形成されているので、鏡筒３０がレンズ装置１００の外方から視認されるような場合であっても、美観を損ねることがなく、デザイン性を向上させる上で有利となる。 According to the present embodiment, the three caulking portions 3406 of the lens barrel 30 corresponding to the three reference surfaces 3404 are the first caulking portions 3406A that are deformed until they contact the outer peripheral portion of the front surface 24 of the second lens 20. Since the portion other than the first caulking portion 3406A of the caulking portion 3406 is formed as a second caulking portion 3406B in which a gap S is secured between the front surface 24 of the second lens 20 and the three caulking portions 3406 are formed. Since the second lens 20 that is not applied to the surface 3404 is not subjected to stress due to the caulking portion, even if the rigidity of the second lens 20 is low, the optical performance is reliably reduced without causing distortion. Can be prevented.
Further, since the crimping portion 3406 is formed over the entire circumference of the side wall 34, the balance of the stress applied to the second lens 20 is made uniform as compared with the case where the side wall 34 is partially caulked in the circumferential direction, This is advantageous in preventing distortion of the second lens 20.
Further, since the first caulking portion 3406A and the second caulking portion 3406B of the side wall 34 of the lens barrel 30 are formed in such a shape that the step D cannot be discerned by the naked eye, the lens barrel 30 is visually recognized from the outside of the lens device 100. Even in such a case, the aesthetic appearance is not impaired and it is advantageous for improving the design.

なお、本実施例では、鏡筒に保持されるレンズとしてメニスカスレンズを例示したが、本発明はこれに限定されるものではなく種々のレンズに適用可能であることは無論である。
また、本実施例のレンズ装置は、テレビカメラ、デジタルスチルカメラ、ビデオカメラ、フィルム式カメラなどの種々の撮像装置、あるいは種々の光学装置に広く適用可能である。 In this embodiment, the meniscus lens is exemplified as the lens held in the lens barrel. However, the present invention is not limited to this and can be applied to various lenses.
In addition, the lens apparatus according to the present embodiment can be widely applied to various imaging apparatuses such as a television camera, a digital still camera, a video camera, and a film camera, or various optical apparatuses.

実施例１のレンズ装置の構成を示す縦断面図である。1 is a longitudinal sectional view illustrating a configuration of a lens apparatus according to Example 1. FIG. 第２レンズ２０および第２側壁部３４部分を示す斜視図である。It is a perspective view which shows the 2nd lens 20 and the 2nd side wall part 34 part. 鏡筒３０の平面図である。2 is a plan view of a lens barrel 30. FIG. 熱カシメ治具の縦断面図である。It is a longitudinal cross-sectional view of a heat caulking jig. 図４のＡ矢視図である。It is A arrow directional view of FIG. 図５のＸＸ線断面図および図５のＹＹ線断面図である。FIG. 6 is a sectional view taken along line XX in FIG. 5 and a sectional view taken along line YY in FIG. 5. 第１カシメ部の説明図である。It is explanatory drawing of a 1st crimping part. 第２カシメ部の説明図である。It is explanatory drawing of a 2nd crimping part. カシメ動作の説明図である。It is explanatory drawing of a crimping operation | movement.

符号の説明Explanation of symbols

１００……レンズ装置、２０……第２レンズ、２２……後面、２４……前面、３０……鏡筒、３４０２……側壁、３４０４……基準面、３４０６……カシメ部、３４０６Ａ……第１カシメ部、３４０６Ｂ……第２カシメ部、Ｓ……間隙。
DESCRIPTION OF SYMBOLS 100 ... Lens apparatus, 20 ... 2nd lens, 22 ... Rear surface, 24 ... Front surface, 30 ... Lens tube, 3402 ... Side wall, 3404 ... Reference surface, 3406 ... Caulking part, 3406A ... First 1 caulking part, 3406B... Second caulking part, S.

Claims (6)

レンズと、該レンズを保持する熱可塑性樹脂からなる鏡筒とを備え、
前記鏡筒は、
前記レンズの外周端面が嵌合される円筒状の側壁と、
前記側壁の幅方向の一端で周方向に間隔をおいた３箇所から該側壁の半径方向内側に突設され前記レンズの一方の面の外周部に臨み同一面上に位置する３つの基準面とを有し、
前記側壁の幅方向の他端がその全周にわたって熱カシメにより該側壁の半径方向内側に変形されてカシメ部が形成され、前記レンズが前記カシメ部と前記３つの基準面との間に挟まれることにより前記レンズが鏡筒により保持されるレンズ装置であって、
前記カシメ部のうち前記３つの基準面に対応する３箇所は前記レンズの他方の面の外周部に当接するまで変形された第１カシメ部として形成され、かつ、前記カシメ部のうち前記第１カシメ部以外の部分は前記レンズの他方の面との間に間隙が確保された第２カシメ部として形成されている、
ことを特徴とするレンズ装置。 A lens and a lens barrel made of a thermoplastic resin that holds the lens;
The lens barrel is
A cylindrical side wall to which the outer peripheral end face of the lens is fitted;
Three reference planes that protrude from the three circumferentially spaced ends at one end in the width direction of the side wall and project radially inward of the side wall to face the outer peripheral portion of one surface of the lens and are on the same plane Have
The other end in the width direction of the side wall is deformed radially inward of the side wall by thermal caulking to form a caulking portion, and the lens is sandwiched between the caulking portion and the three reference surfaces. A lens device in which the lens is held by a lens barrel,
Three portions of the caulking portion corresponding to the three reference surfaces are formed as first caulking portions that are deformed until they contact the outer peripheral portion of the other surface of the lens, and the first caulking portion is the first caulking portion. The portion other than the caulking portion is formed as a second caulking portion in which a gap is secured between the other surface of the lens.
A lens device. 前記第１カシメ部と第２カシメ部の先端は同一円周上に位置するように設けられているとを特徴とする請求項１記載のレンズ装置。   The lens device according to claim 1, wherein tips of the first caulking portion and the second caulking portion are provided so as to be positioned on the same circumference. 前記レンズの他方の面はレンズの前面を構成しており、前記カシメ部は前記レンズの前面に臨む後面と、前記レンズの前面の前方に臨む前面とを備え、前記第１カシメ部の前面と第２カシメ部の前面とは前記レンズの半径方向外方に至るにつれて前記レンズの光軸と直交する平面に対して離れるように傾斜して形成され、前記レンズの光軸と直交する平面に対する第２カシメ部の前面の傾斜角度は、前記レンズの光軸と直交する平面に対する前記第１カシメ部の前面の傾斜角度よりも小さくなるように形成されていることを特徴とする請求項１記載のレンズ装置。   The other surface of the lens constitutes a front surface of the lens, and the caulking portion includes a rear surface facing the front surface of the lens and a front surface facing the front of the front surface of the lens, and the front surface of the first caulking portion; The front surface of the second caulking portion is formed so as to be inclined with respect to a plane orthogonal to the optical axis of the lens as it goes radially outward of the lens, and The tilt angle of the front surface of the two crimping portions is formed to be smaller than the tilt angle of the front surface of the first crimping portion with respect to a plane orthogonal to the optical axis of the lens. Lens device. 前記レンズの一方の面の外周部は平面で形成され、前記３つの基準面は同一平面上を延在していることを特徴とする請求項１記載のレンズ装置。   2. The lens device according to claim 1, wherein an outer peripheral portion of one surface of the lens is formed as a flat surface, and the three reference surfaces extend on the same plane. 前記レンズは前記一方の面が凹面で形成され他方の面が凸面で形成されたメニスカスレンズであることを特徴とする請求項１記載のレンズ装置。   2. The lens device according to claim 1, wherein the lens is a meniscus lens having one surface formed as a concave surface and the other surface formed as a convex surface. 前記レンズはその一方の面が凹面で形成され他方の面が凸面で形成されたメニスカスレンズであり、前記レンズの中心の厚さは外周部の厚さよりも大きい寸法で形成されていることを特徴とする請求項１記載のレンズ装置。
The lens is a meniscus lens having one surface formed as a concave surface and the other surface formed as a convex surface, and the thickness of the center of the lens is larger than the thickness of the outer peripheral portion. The lens device according to claim 1.
JP2003300719A 2003-08-26 2003-08-26 Lens device Expired - Fee Related JP4285153B2 (en)

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