JP4959183B2 - Photography lens and optical apparatus using the photography lens - Google Patents

Photography lens and optical apparatus using the photography lens Download PDF

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JP4959183B2
JP4959183B2 JP2005357615A JP2005357615A JP4959183B2 JP 4959183 B2 JP4959183 B2 JP 4959183B2 JP 2005357615 A JP2005357615 A JP 2005357615A JP 2005357615 A JP2005357615 A JP 2005357615A JP 4959183 B2 JP4959183 B2 JP 4959183B2
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lens
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light shielding
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JP2007163657A (en
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浩 渡辺
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Kantatsu Co Ltd
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Description

本発明は、複数のレンズを光軸方向に重ね合わせて鏡筒内に収容した撮影レンズ及び撮影レンズを用いた光学機器、特に、複数のレンズを鏡筒内に積み重ねるようして収容する際、積み重ねたレンズの組立誤差を可及的に抑えることが可能な撮影レンズ及び撮影レンズを用いたカメラ、デジタルカメラ、移動体通信装置等の光学機器に関する。   The present invention is a photographic lens in which a plurality of lenses are stacked in the optical axis direction and accommodated in a lens barrel and an optical device using the photographic lens, particularly when a plurality of lenses are stacked and accommodated in a lens barrel. The present invention relates to a photographing lens capable of suppressing assembling errors of stacked lenses as much as possible, and an optical apparatus such as a camera, a digital camera, and a mobile communication device using the photographing lens.

従来から、プラスチックレンズとガラスレンズを含む複数のレンズを鏡筒内に固定した撮影レンズが知られており、例えば、本願出願人は特許文献１で複数のレンズを光軸方向に互いに当接させて重ね合わせることにより、光学的または物理的に向き合う互いのレンズ間の位置関係を決定することが可能なレンズの位置決め方法並びに該方法を適用した光学機器を提案している。これは、図４に示すように、撮影レンズは、鏡筒５１、プラスチック製前段レンズ５２、弾性を有する内遮光板５３、中間レンズ５４、弾性を有するレンズ規制部材５５、プラスチック製後段レンズ５７、内遮光板５６、固定保持部材５８から構成されている。   2. Description of the Related Art Conventionally, a photographing lens is known in which a plurality of lenses including a plastic lens and a glass lens are fixed in a lens barrel. For example, the applicant of the present application in Patent Document 1 causes a plurality of lenses to contact each other in the optical axis direction. Have proposed a lens positioning method capable of determining a positional relationship between optically or physically facing lenses, and an optical apparatus to which the method is applied. As shown in FIG. 4, the photographing lens includes a lens barrel 51, a plastic front lens 52, an elastic inner light shielding plate 53, an intermediate lens 54, an elastic lens regulating member 55, a plastic rear lens 57, An inner light shielding plate 56 and a fixed holding member 58 are included.

特開２００２−２８６９８７号公報JP 2002-286987 A

図４に示す撮影レンズは、組み立てに際し、鏡筒５１に対し、前段レンズ５２、内遮光板５３、中間レンズ５４、レンズ規制部材５５、内遮光板５６、後段レンズ５７、固定保持部材５８を順次挿入する。この時、前段レンズ５２のテーパ面５２ａと後段レンズ５７のテーパ面５７ａを面当接させることによって、各レンズ５２,５７の光軸Ｓが位置を合わせされるが、これらテーパ面５２ａ,５７ａの重ね合わせ部において、一方のテーパ面５２ａの先端部と他方のテーパ面５７ａの基端縁とが離れ、隙間ｔが形成され、各レンズ５２,５４,５７の間に介在される内遮光板５３,５６は各レンズ５２,５４,５７で挟着されることになる。しかし、内遮光板５３,５６は成形加工が容易なプラスチックなどの合成樹脂によって成形され、比較的剛性の低い素材で成形され、各レンズ５２,５４,５７から受ける押圧力によって厚みが狂い易いばかりでなく、成形誤差などに起因して内遮光板５３,５６の厚みもバラツキが生じ易い。このため、図４のように、一方のテーパ面５２ａの先端部と他方のテーパ面５７ａの基端縁とに隙間ｔが生じる構造では、組み付けられた撮影レンズの組立精度を保つことが困難であり、このような組立精度のバラツキによって組み立てた撮影レンズの光学的性能にも影響を与える、という課題を有していた。   4, when assembled, the front lens 52, the inner light shielding plate 53, the intermediate lens 54, the lens regulating member 55, the inner light shielding plate 56, the rear lens 57, and the fixed holding member 58 are sequentially arranged with respect to the lens barrel 51. insert. At this time, the optical surfaces S of the lenses 52 and 57 are aligned by bringing the tapered surface 52a of the front lens 52 and the tapered surface 57a of the rear lens 57 into contact with each other. In the overlapping portion, the distal end portion of one tapered surface 52a and the base end edge of the other tapered surface 57a are separated to form a gap t, and the inner light shielding plate 53 interposed between the lenses 52, 54, 57. , 56 are sandwiched between the lenses 52, 54, 57. However, the inner light-shielding plates 53 and 56 are formed of a synthetic resin such as plastic that is easy to mold, are formed of a relatively low-rigidity material, and the thickness tends to be distorted by the pressing force received from the lenses 52, 54, and 57. In addition, the thickness of the inner light shielding plates 53 and 56 is likely to vary due to molding errors and the like. For this reason, as shown in FIG. 4, it is difficult to maintain the assembly accuracy of the assembled photographic lens in a structure in which a gap t is formed between the distal end portion of one tapered surface 52a and the base end edge of the other tapered surface 57a. There is a problem that the optical performance of the photographing lens assembled by such a variation in assembly accuracy is also affected.

本発明は、以上のような事情に鑑みなされたもので、複数のレンズが鏡筒内に位置決め固定される撮影レンズにおいて、レンズ間に介在する内遮光板の成形精度などのバラツキによって撮影レンズの組立精度が影響を受けることなく、高精度に確実に行うことができる撮影レンズ及びそれを用いた光学機器を提供することを目的とする。   The present invention has been made in view of the above circumstances, and in a photographic lens in which a plurality of lenses are positioned and fixed in a lens barrel, the photographic lens has a variation due to variations in molding accuracy of an inner light shielding plate interposed between the lenses. An object of the present invention is to provide a photographic lens that can be reliably and accurately performed without affecting the assembly accuracy, and an optical apparatus using the same.

請求項１記載の撮影レンズは、下段プラスチックレンズと、中間プラスチックレンズと、上段プラスチックレンズと、この上段プラスチックレンズの上面に配置されるガラスレンズによって構成される複数のレンズと、前記各プラスチックレンズの間に介在する内遮光板とを光軸方向に重ね合わせて収容するとともに、外周中央部にフォーカス調整雄螺子部を有する鏡筒とを備えた撮影レンズであって、前記下段側のレンズに前記内遮光板を載置する載置面と、この載置面の外周縁から傾斜状に立ち上がる内向きテーパ面と、この内向きテーパ面から外方に向かう段差凸面とを含む段差凸部を形成し、前記上段側のレンズには前記載置面と対向する保持面と、この保持面の外周縁から傾斜状に立ち上がる外向きテーパ面と、この外向きテーパ面から外方に向かう受面とを含む段差凹部を形成し、前記各レンズを積み重ねて鏡筒内に収容する際、前記段差凸部と段差凹部のテーパ面を相互に面接触させて上下各レンズの光軸を位置合わせするとともに、前記上段プラスチックレンズを前記鏡筒の上部側に圧入して前記上下各レンズの光軸と前記鏡筒の中心とを位置合わせし、かつ、前記段差凸面の頂部を前記受面に突き当てて前記載置面と保持面との間に前記内遮光板の板厚に相当する隙間を形成したことを特徴とする。 According to a first aspect of the present invention, there is provided a photographing lens comprising: a lower plastic lens; an intermediate plastic lens; an upper plastic lens; a plurality of lenses configured by a glass lens disposed on an upper surface of the upper plastic lens; An imaging lens having an inner light shielding plate interposed therebetween and accommodated in the direction of the optical axis, and a lens barrel having a focus adjustment male screw portion at the center of the outer periphery , wherein the lens on the lower side is provided with the lens A stepped convex portion is formed that includes a mounting surface on which the inner light shielding plate is mounted, an inwardly tapered surface that rises in an inclined manner from the outer peripheral edge of the mounting surface, and a stepped convex surface that faces outward from the inwardly tapered surface. The upper lens includes a holding surface that faces the mounting surface, an outwardly tapered surface that rises in an inclined manner from the outer peripheral edge of the holding surface, and the outwardly tapered surface. A step concave portion including a receiving surface directed outward from the lens, and when the lenses are stacked and accommodated in the lens barrel, the step convex portion and the tapered surface of the step concave portion are brought into surface contact with each other so that the upper and lower lenses are in contact with each other. And aligning the optical axis of each of the upper and lower lenses with the center of the lens barrel , and the top of the step convex surface. A gap corresponding to the thickness of the inner light-shielding plate is formed between the placement surface and the holding surface .

請求項２記載の撮影レンズは、前記内遮光板が合成樹脂によって成形されていることを特徴とする。 The photographic lens described in claim 2 is characterized in that the inner light shielding plate is formed of a synthetic resin .

請求項３記載の撮影レンズは、請求項１又は２記載の撮影レンズにおいて、前記テーパ面の仮想延長線の交点が鏡筒の中心と同一軸線上であることを特徴とする。 The photographic lens described in claim 3 is the photographic lens described in claim 1 or 2, characterized in that the intersection of the virtual extension lines of the tapered surface is on the same axis as the center of the lens barrel .

請求項４記載の光学機器は、請求項１乃至３のいずれかに記載の撮影レンズを用いたことを特徴とする。 According to a fourth aspect of the present invention, there is provided an optical apparatus using the photographing lens according to any one of the first to third aspects.

請求項１記載の撮影レンズは、下段プラスチックレンズと、中間プラスチックレンズと、上段プラスチックレンズと、この上段プラスチックレンズの上面に配置されるガラスレンズによって構成される複数のレンズと、前記各プラスチックレンズの間に介在する内遮光板とを光軸方向に重ね合わせて収容するとともに、外周中央部にフォーカス調整雄螺子部を有する鏡筒とを備えた撮影レンズであって、前記下段側のレンズに前記内遮光板を載置する載置面と、この載置面の外周縁から傾斜状に立ち上がる内向きテーパ面と、この内向きテーパ面から外方に向かう段差凸面とを含む段差凸部を形成し、前記上段側のレンズには前記載置面と対向する保持面と、この保持面の外周縁から傾斜状に立ち上がる外向きテーパ面と、この外向きテーパ面から外方に向かう受面とを含む段差凹部を形成し、前記各レンズを積み重ねて鏡筒内に収容する際、前記段差凸部と段差凹部のテーパ面を相互に面接触させて上下各レンズの光軸を位置合わせするとともに、前記上段プラスチックレンズを前記鏡筒の上部側に圧入して前記上下各レンズの光軸と前記鏡筒の中心とを位置合わせし、かつ、前記段差凸面の頂部を前記受面に突き当てて前記載置面と保持面との間に前記内遮光板の板厚に相当する隙間を形成したものであるから、内遮光板の成形誤差によって板厚にバラツキが生じても段差凸部と段差凹部との間に内遮光板を配置する隙間を確実に確保でき、組み付けられた撮影レンズの組立精度が光軸方向にバラツクことなく、高精度に保つことができる。また、各レンズを積み重ねて鏡筒内に収容する際、内遮光板を載置する下段レンズ側の載置面と上段レンズ側に保持面との間に内遮光板を配置する隙間を確実に確保することができる。 According to a first aspect of the present invention, there is provided a photographing lens comprising: a lower plastic lens; an intermediate plastic lens; an upper plastic lens; a plurality of lenses configured by a glass lens disposed on an upper surface of the upper plastic lens; An imaging lens having an inner light shielding plate interposed therebetween and accommodated in the direction of the optical axis, and a lens barrel having a focus adjustment male screw portion at the center of the outer periphery , wherein the lens on the lower side is provided with the lens A stepped convex portion is formed that includes a mounting surface on which the inner light shielding plate is mounted, an inwardly tapered surface that rises in an inclined manner from the outer peripheral edge of the mounting surface, and a stepped convex surface that faces outward from the inwardly tapered surface. The upper lens includes a holding surface that faces the mounting surface, an outwardly tapered surface that rises in an inclined manner from the outer peripheral edge of the holding surface, and the outwardly tapered surface. A step concave portion including a receiving surface directed outward from the lens, and when the lenses are stacked and accommodated in the lens barrel, the step convex portion and the tapered surface of the step concave portion are brought into surface contact with each other so that the upper and lower lenses are in contact with each other. And aligning the optical axis of each of the upper and lower lenses with the center of the lens barrel , and the top of the step convex surface. Since a gap corresponding to the thickness of the inner light shielding plate is formed between the placement surface and the holding surface by abutting against the receiving surface, there is a variation in the plate thickness due to a molding error of the inner light shielding plate. Even if it occurs, it is possible to reliably secure a gap for disposing the inner light shielding plate between the step convex portion and the step concave portion, and it is possible to keep the assembly accuracy of the assembled photographing lens highly accurate without variation in the optical axis direction. . In addition, when each lens is stacked and accommodated in the lens barrel, a gap for placing the inner light shielding plate between the lower lens side mounting surface on which the inner light shielding plate is placed and the holding surface on the upper lens side is ensured. Can be secured.

請求項２記載の撮影レンズによれば、請求項１記載の撮影レンズにおいて、前記内遮光板が合成樹脂によって成形されているから、内遮光板として剛性の低い素材で形成しても、上下のレンズから受ける押圧力が内遮光板に作用しないから、内遮光板の厚みのバラツキによって撮影レンズの組立精度が光軸方向にバラツクことなく、高精度に保つことができる。 According to the imaging lens according to claim 2, in the photographing lens according to claim 1, since the inner shielding plate is formed of synthetic resin, even when having a low material stiffness as the internal light shielding plate, the upper and lower Since the pressing force received from the lens does not act on the inner light shielding plate, the assembling accuracy of the photographing lens does not vary in the optical axis direction due to the variation in the thickness of the inner light shielding plate, and can be maintained with high accuracy .

請求項３記載の撮影レンズによれば、請求項１又は２記載の撮影レンズにおいて、前記テーパ面の仮想延長線の交点が鏡筒の中心と同一軸線上であるから、各レンズの重ね合わせ面に形成するテーパ面を相互に嵌合させることによって、各レンズの光軸と鏡筒の中心軸との位置合わせが可能となる。 According to the photographing lens according to claim 3, in the photographing lens according to claim 1 or 2, since the intersection of the virtual extension lines of the tapered surface is on the same axis as the center of the lens barrel, the overlapping surface of each lens By aligning the tapered surfaces formed on each other, the optical axis of each lens and the center axis of the lens barrel can be aligned .

請求項４記載の光学機器によれば、請求項１乃至３のいずれかに記載の撮影レンズを用いたものであるから、光学機器における撮影レンズの調芯作業を簡略化することができる。 According to the optical device according to the fourth aspect , since the photographing lens according to any one of the first to third aspects is used, the alignment operation of the photographing lens in the optical device can be simplified .

以下、本発明を実施するための最良の形態としての実施例を図１〜図３を参照して説明する。もちろん、本発明は、その発明の趣旨に反さない範囲で、実施例において説明した以外のものに対しても容易に適用可能なことは説明を要するまでもない。   Hereinafter, an embodiment as the best mode for carrying out the present invention will be described with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to other than those described in the embodiments without departing from the spirit of the invention.

図１は、本発明の実施例による撮影レンズを断面図、図２は、図１に示す撮影レンズを示す分解図、図３はレンズの重ね合わせ部分の拡大断面図であり、本実施例の撮影レンズ１は、鏡筒２と、プラスチック材からなるプラスチックレンズ３,４,５と、この各プラスチックレンズ３,４,５の間に介在する内遮光板６,７と、上段プラスチックレンズ５上に配置されるガラスレンズ８と、固定保持部材９等から構成されている。   1 is a cross-sectional view of a photographic lens according to an embodiment of the present invention, FIG. 2 is an exploded view of the photographic lens shown in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of an overlapping portion of the lenses. The photographic lens 1 includes a lens barrel 2, plastic lenses 3, 4, 5 made of plastic material, inner light shielding plates 6, 7 interposed between the plastic lenses 3, 4, 5, and the upper plastic lens 5. It is comprised from the glass lens 8 arrange | positioned by this, and the fixed holding member 9 grade | etc.,.

鏡筒２は全体として上下を開口した円筒状に形成され、内周底部寄り載置用フランジ部１０を中心方向に向かって一体形成している。また、開口した上部内周面には、固定保持部材９の外周面に形成する雄螺子部９ａを螺着する雌螺子部２aが形成され、鏡筒２の外周面中央部にはフォーカス調整雄螺子部２ｂが形成されている。そして、前記載置用フランジ部１０に下段プラスチックレンズ３、内遮光板６、中間プラスチックレンズ４、内遮光板７、上段プラスチックレンズ５、ガラスレンズ８を順次積み重ねて鏡筒２内に収容した後、鏡筒２の雌螺子部２aに固定保持部材９の雄螺子部９ａを螺着することによって、鏡筒２に収容した下段プラスチックレンズ３、内遮光板６、中間プラスチックレンズ４、内遮光板７、上段プラスチックレンズ５を光軸方向に押える。また、固定保持部材９の中央には、ガラスレンズ８に対応する開口窓１２が形成されるとともに、その前面に設けた凹部１３に保護ガラス１４ａが嵌め込まれ、鏡筒２の下面開口部には赤外線をカットするフィルタ１４ｂが嵌め込まれている。 The lens barrel 2 is formed in a cylindrical shape that is open at the top and bottom as a whole, and is integrally formed with a mounting flange portion 10 closer to the inner periphery toward the center. Further, a female screw portion 2a for screwing a male screw portion 9a formed on the outer peripheral surface of the fixed holding member 9 is formed on the opened upper inner peripheral surface, and a focus adjusting male is formed at the central portion of the outer peripheral surface of the lens barrel 2. A screw portion 2b is formed. After the lower plastic lens 3, the inner light shielding plate 6, the intermediate plastic lens 4, the inner light shielding plate 7, the upper plastic lens 5, and the glass lens 8 are sequentially stacked on the mounting flange portion 10 and accommodated in the lens barrel 2. The lower screw lens 3, the inner light shielding plate 6, the intermediate light shielding plate 4, and the inner light shielding plate housed in the lens barrel 2 by screwing the male screw portion 9 a of the fixing holding member 9 to the female screw portion 2 a of the lens barrel 2. 7. Press the upper plastic lens 5 in the optical axis direction. In addition, an opening window 12 corresponding to the glass lens 8 is formed at the center of the fixed holding member 9, and a protective glass 14 a is fitted into a recess 13 provided on the front surface of the fixing window 9. A filter 14b for cutting infrared rays is fitted.

上段プラスチックレンズ５は、物体側（上面側）中央に前記ガラスレンズ８を位置決めする環状突部１５を一体形成し、像面側に凹レンズ面を有するプラスチック材からなる凸レンズで、像面側凹レンズ面から順次、第１の保持面５ａ、円錐状の外向きテーパ面５ｂ、第１の受面５ｃが同心円状に形成され、これら第１の保持面５ａ、外向きテーパ面５ｂ、第１の受面５ｃによって第１の段差凹部５ｅが形成される。   The upper plastic lens 5 is a convex lens made of a plastic material having an annular protrusion 15 for positioning the glass lens 8 at the center of the object side (upper surface side) and having a concave lens surface on the image surface side. The first holding surface 5a, the conical outward tapered surface 5b, and the first receiving surface 5c are formed concentrically in order from the first holding surface 5a, the outward tapered surface 5b, and the first receiving surface. A first step recess 5e is formed by the surface 5c.

中間プラスチックレンズ４は、上段プラスチックレンズ５と下段プラスチックレンズ３の間に介在し、物体側が凹レンズ面、像面側に凸レンズ面を有する凸レンズである。また、中間プラスチックレンズ４の表面側は、その凹レンズ面の外周部に位置して内遮光板７を支持する第１の載置面４ａと、円錐状の内向きテーパ面４ｂ、第１の段差凸面４ｃが同心円状に形成され、これら第１の載置面４ａ、内向きテーパ面４ｂ、第１の段差凸面４ｃによって第１の段差凸部４ｄが形成されている。また、中間プラスチックレンズ４の裏面側は、凸レンズ面の外周部に位置して第２の保持面４ｅと、円錐状の外向きテーパ面４ｆと、第２の受面４ｇが同心円状に形成され、これら第２の保持面４ｅ、外向きテーパ４ｆと、第２の受面４ｇによって第２の段差凹部４ｈが形成されている。   The intermediate plastic lens 4 is a convex lens that is interposed between the upper plastic lens 5 and the lower plastic lens 3 and has a concave lens surface on the object side and a convex lens surface on the image surface side. Further, the surface side of the intermediate plastic lens 4 is located on the outer peripheral portion of the concave lens surface, the first placement surface 4a supporting the inner light shielding plate 7, the conical inwardly tapered surface 4b, the first step. The convex surface 4c is formed concentrically, and the first step convex portion 4d is formed by the first placement surface 4a, the inwardly tapered surface 4b, and the first step convex surface 4c. Further, on the back surface side of the intermediate plastic lens 4, a second holding surface 4e, a conical outward taper surface 4f, and a second receiving surface 4g are formed concentrically on the outer periphery of the convex lens surface. The second holding surface 4e, the outward taper 4f, and the second receiving surface 4g form a second step recess 4h.

下段プラスチックレンズ３は、物体側が凹レンズ面、像面側に凸レンズ面を有する凸レンズであり、凹レンズ面の外周には内遮光板６を支持する第２の載置面３ａと、円錐状の内向きテーパ面３ｂと、第２の段差凸面３ｃが同心円状に形成され、これら第２の載置面３ａと、内向きテーパ面３ｂと、第２の段差凸面３ｃによって段差凸部３ｄが形成される。また、下段プラスチックレンズ３の裏面側は、凸レンズ面の外周部に位置して前記載置用フランジ部１０に載置するための平坦面３eが形成されている。このように、各プラスチックレンズ３,４,５には、それぞれの重ね合わせ面にテーパ面３ｂ,４ｂ,４ｆ,５ｂを有する段差凸部３ｄ，４ｄと段差凹部４ｈ，５ｅがそれぞれ形成され、これら段差凸部３ｄ，４ｄと段差凹部４ｈ，５ｅを嵌合させてそれぞれのテーパ面３ｂ,４ｂ,４ｆ,５ｂを面接触させることによって、各プラスチックレンズ３,４,５の光軸Ｓの位置合わせが行われる。すなわち、各テーパ面３ｄ,４ｂ,４ｅ,５ｂの仮想延長線の交点が光軸Ｓと一致する。また、上段プラスチックレンズ５は前記鏡筒２の内周面に圧入して鏡筒２の中心と上段プラスチックレンズ５の光軸Ｓとが位置合わせされるが、他のプラスチックレンズ３,４は鏡筒２の内周面に対してクリアランスを持たせるように設定され、上段プラスチックレンズ５を除く中間、下段プラスチックレンズ３,４の外周と鏡筒２の内周面との間に僅かな隙間が形成される。   The lower plastic lens 3 is a convex lens having a concave lens surface on the object side and a convex lens surface on the image surface side, and a second mounting surface 3a for supporting the inner light shielding plate 6 on the outer periphery of the concave lens surface, and a conical inward direction. A tapered surface 3b and a second stepped convex surface 3c are formed concentrically, and a stepped convex portion 3d is formed by the second mounting surface 3a, the inwardly tapered surface 3b, and the second stepped convex surface 3c. . Further, the back surface side of the lower plastic lens 3 is formed with a flat surface 3e that is located on the outer peripheral portion of the convex lens surface and is placed on the mounting flange portion 10 described above. In this way, each plastic lens 3, 4, 5 is formed with stepped convex portions 3d, 4d and stepped concave portions 4h, 5e having tapered surfaces 3b, 4b, 4f, 5b on the respective overlapping surfaces. By aligning the stepped convex portions 3d, 4d and the stepped concave portions 4h, 5e and bringing the respective tapered surfaces 3b, 4b, 4f, 5b into surface contact, the optical axes S of the plastic lenses 3, 4, 5 are aligned. Is done. That is, the intersection of the virtual extension lines of the tapered surfaces 3d, 4b, 4e, and 5b coincides with the optical axis S. The upper plastic lens 5 is press-fitted into the inner peripheral surface of the lens barrel 2 so that the center of the lens barrel 2 and the optical axis S of the upper plastic lens 5 are aligned, but the other plastic lenses 3 and 4 are mirrors. A clearance is set between the inner peripheral surface of the tube 2 and a slight gap is formed between the outer periphery of the middle and lower plastic lenses 3 and 4 excluding the upper plastic lens 5 and the inner peripheral surface of the lens barrel 2. It is formed.

内遮光板６,７はプラスチックなどの合成樹脂材料などからなるシート状であって、内径部は絞り穴６ａ,７ａとして機能する。この各内遮光板６,７は、各プラスチックレンズ３,４,５の重ね合わせ面に位置する第２の載置面３ａと第２の保持面４ｅ及び第１の載置面４ａと第１の保持面５ａの間に介在される。   The inner light shielding plates 6 and 7 are in the form of a sheet made of a synthetic resin material such as plastic, and the inner diameter portions function as throttle holes 6a and 7a. Each of the inner light shielding plates 6, 7 has a second placement surface 3 a, a second holding surface 4 e, a first placement surface 4 a, and a first placement position that are positioned on the overlapping surface of the plastic lenses 3, 4, 5. Between the holding surfaces 5a.

ガラスレンズ８は物体側と像面側に凸レンズ面を有する凸レンズであり、前記上段プラスチックレンズ５に形成された環状突部１５の内側に配置してガラスレンズ８に対して接着固定する。環状突部１５とガラスレンズ８との間にはガラスレンズ８の成形誤差を吸収するためのクリアランスが形成され、上段プラスチックレンズ５に対してガラスレンズ８の光軸Ｓを調芯してから接着材によって一体的に接着固定している。   The glass lens 8 is a convex lens having convex lens surfaces on the object side and the image plane side, and is disposed inside the annular protrusion 15 formed on the upper plastic lens 5 and is bonded and fixed to the glass lens 8. A clearance for absorbing a molding error of the glass lens 8 is formed between the annular protrusion 15 and the glass lens 8, and the optical axis S of the glass lens 8 is aligned with the upper plastic lens 5 before bonding. It is bonded and fixed integrally with the material.

次に、撮影レンズ１の組み立て手順について説明する。撮影レンズ１の組立に際し、図２に示すように、鏡筒２の上面開口部は開放しており、先ず上面開口部から下段プラスチックレンズ３、内遮光板６、中間プラスチックレンズ４、内遮光板７、上段プラスチックレンズ５を順次挿入して載置用フランジ部１０に載置する。この際、下段プラスチックレンズ３の第２の載置面３ａに内遮光板６を載置して中間プラスチックレンズ４を重ね合わせると、下段プラスチックレンズ３の第２の段差凸部３ｄに形成された内向きのテーパ面３ｂと中間プラスチックレンズ４の第２の段差凹部４ｈに形成された外向きのテーパ面４ｆとが嵌合し、下段プラスチックレンズ３と中間プラスチックレンズ４との光軸Ｓが位置合わせされる。また、中間プラスチックレンズ４の第１の載置面４ａに内遮光板７を載置して上段プラスチックレンズ５を重ね合わせると、中間プラスチックレンズ４の第１の段差凸部４ｄに形成された内向きのテーパ面４ｂと上段プラスチックレンズ５の第１の段差凹部５ｅに形成された外向きのテーパ面５ｂとが嵌合し、上段プラスチックレンズ５と中間プラスチックレンズ４との光軸Ｓが位置合わせ、これにより、それぞれのプラスチックレンズ３,４,５それぞれの光軸Ｓが位置合わせされる。さらに、最上部に位置する上段プラスチックレンズ５は、外周縁を鏡筒２の内周面に圧入することで鏡筒２の中心軸と上段プラスチックレンズ５の光軸Ｓが位置合わせされる。これにより、鏡筒２に挿入される各プラスチックレンズ３,４,５の光軸Ｓを調芯しながら各プラスチックレンズ３,４,５を積み重ね、最後に挿入する上段プラスチックレンズ５を鏡筒２に圧入して鏡筒２に対する各プラスチックレンズ３,４,５の光軸Ｓの調芯を行い、最終的に上段プラスチックレンズ５を鏡筒２に圧入することによって各プラスチックレンズ３,４,５を一体化する。また、前記第１及び第２の段差凸部４ｄ，３ｄと第１及び第２の段差凹部５ｅ，４ｈを嵌合させた際、第１及び第２の段差凸部４ｄ，３ｄの頂部３ｆ，４iが第１及び第２の段差凹部５ｅ，４ｈの第１及び第２の受面５ｃ，４ｇに突き当たり、第１及び第２の載置面４ａ，３ａと第１及び第２の保持面５ａ，４ｅの間には内遮光板６，７の板厚に相当する隙間ｔ１，ｔ２が形成される。この後、調芯された上段プラスチックレンズ５の環状突部１５内にガラスレンズ８を配置し、ガラスレンズ８の光軸を調整した後、接着剤によって上段プラスチックレンズ５とガラスレンズ８とを一体化する。これにより、それぞれのレンズ３,４,５,８の光軸Ｓを合わせ、かつ上段プラスチックレンズ５を基準として鏡筒２の中心軸に対して全てのレンズ３,４,５,８の光軸Ｓを合わせて調芯が完了する。この後、鏡筒２の雌螺子部２aに固定保持部材９の雄螺子部９ａを螺着することによって、鏡筒２に収容した下段プラスチックレンズ３、内遮光板６、中間プラスチックレンズ４、内遮光板７、上段プラスチックレンズ５、を光軸方向に押える。   Next, the procedure for assembling the photographic lens 1 will be described. When the photographing lens 1 is assembled, as shown in FIG. 2, the upper surface opening of the lens barrel 2 is opened. First, from the upper surface opening, the lower plastic lens 3, the inner light shielding plate 6, the intermediate plastic lens 4, and the inner light shielding plate. 7. The upper plastic lens 5 is sequentially inserted and placed on the placement flange 10. At this time, when the inner light shielding plate 6 is placed on the second placement surface 3a of the lower plastic lens 3 and the intermediate plastic lens 4 is overlaid, the second step convex portion 3d of the lower plastic lens 3 is formed. The inwardly tapered surface 3b and the outwardly tapered surface 4f formed in the second step recess 4h of the intermediate plastic lens 4 are fitted, and the optical axis S between the lower plastic lens 3 and the intermediate plastic lens 4 is positioned. To be combined. Further, when the inner light shielding plate 7 is placed on the first placement surface 4 a of the intermediate plastic lens 4 and the upper plastic lens 5 is overlapped, the inner step formed on the first step convex portion 4 d of the intermediate plastic lens 4 is formed. The taper surface 4b facing and the outward taper surface 5b formed in the first step recess 5e of the upper plastic lens 5 are fitted, and the optical axis S between the upper plastic lens 5 and the intermediate plastic lens 4 is aligned. Thus, the optical axes S of the respective plastic lenses 3, 4, 5 are aligned. Further, the upper plastic lens 5 located at the uppermost portion is press-fitted with the outer peripheral edge to the inner peripheral surface of the lens barrel 2 so that the central axis of the lens barrel 2 and the optical axis S of the upper plastic lens 5 are aligned. As a result, the plastic lenses 3, 4, 5 are stacked while aligning the optical axes S of the plastic lenses 3, 4, 5 inserted into the lens barrel 2, and the upper plastic lens 5 to be inserted last is attached to the lens barrel 2. The plastic lenses 3, 4, 5 are aligned with each other by aligning the optical axes S of the plastic lenses 3, 4, 5 with respect to the lens barrel 2, and finally the upper plastic lens 5 is press-fitted into the lens barrel 2. Is integrated. Further, when the first and second stepped protrusions 4d and 3d are fitted to the first and second stepped protrusions 5e and 4h, the tops 3f of the first and second stepped protrusions 4d and 3d, 4i hits the first and second receiving surfaces 5c and 4g of the first and second stepped recesses 5e and 4h, and the first and second placement surfaces 4a and 3a and the first and second holding surfaces 5a. , 4e, gaps t1, t2 corresponding to the thickness of the inner light shielding plates 6, 7 are formed. Thereafter, the glass lens 8 is disposed in the annular protrusion 15 of the aligned upper plastic lens 5 and the optical axis of the glass lens 8 is adjusted, and then the upper plastic lens 5 and the glass lens 8 are integrated with an adhesive. Turn into. As a result, the optical axes S of the lenses 3, 4, 5, and 8 are aligned, and the optical axes of all the lenses 3, 4, 5, and 8 with respect to the central axis of the barrel 2 with the upper plastic lens 5 as a reference. Alignment with S is completed. Thereafter, by screwing the male screw portion 9a of the fixing holding member 9 to the female screw portion 2a of the lens barrel 2, the lower plastic lens 3, the inner light shielding plate 6, the intermediate plastic lens 4, and the inner plastic lens 3 housed in the lens barrel 2 are secured. The light shielding plate 7 and the upper plastic lens 5 are pressed in the optical axis direction.

以上のように、本実施例においては、鏡筒２の上面を開口させ、その開口部から順次、下段プラスチックレンズ３、内遮光板６、中間プラスチックレンズ４、内遮光板７、上段プラスチックレンズ５を順次挿入し、その各プラスチックレンズ３,４,５の重ね合わせ面に形成されたテーパ面３ｂ,４ｂ,４ｆ,５ｂによって各プラスチックレンズ３,４,５の光軸Ｓを順次、調芯しながら鏡筒２の載置用フランジ部１０上に積み重ね、最後に挿入する上段プラスチックレンズ５を鏡筒２に圧入することによって、鏡筒２に対する各プラスチックレンズ３,４,５の光軸Ｓの調芯を行うことができ、このように、鏡筒２に対して各プラスチックレンズ３,４,５の調芯作業が完了した状態で上段プラスチックレンズ５に対してガラスレンズ８の光軸Ｓの位置合わせ行って調芯することができる。   As described above, in this embodiment, the upper surface of the lens barrel 2 is opened, and the lower plastic lens 3, the inner light shielding plate 6, the intermediate plastic lens 4, the inner light shielding plate 7, and the upper plastic lens 5 are sequentially formed from the opening. Are sequentially inserted, and the optical axes S of the plastic lenses 3, 4, 5 are sequentially aligned by the tapered surfaces 3b, 4b, 4f, 5b formed on the overlapping surfaces of the plastic lenses 3, 4, 5 respectively. The upper plastic lens 5 that is stacked on the mounting flange portion 10 of the lens barrel 2 and finally inserted is press-fitted into the lens barrel 2, so that the optical axis S of each plastic lens 3, 4, 5 with respect to the lens barrel 2 can be reduced. Alignment can be performed, and the optical axis S of the glass lens 8 with respect to the upper plastic lens 5 in a state where the alignment operation of the plastic lenses 3, 4, 5 is completed with respect to the lens barrel 2 as described above. Position It is possible to go to alignment.

また、各プラスチックレンズ３,４,５を積み重ねる際、第１及び第２の段差凸部４ｄ，３ｄと第１及び第２の段差凹部５ｅ，４ｈの嵌合時において、第１及び第２の段差凸部４ｄ，３ｄの頂部３ｆ，４iが第１及び第２の段差凹部５ｅ，４ｈの第１及び第２の受面５ｃ，４ｇに突き当たり、第１及び第２の載置面４ａ，３ａと第１及び第２の保持面５ａ，４ｅの間には内遮光板６，７の板厚に相当する隙間ｔ１，ｔ２が形成されているため、内遮光板６，７の成形誤差による板厚にバラツキあるいは各レンズ３,４,５から受ける押圧力による内遮光板６，７の撓みによって、隙間ｔ１，ｔ２は変わらないから、組み付けられた撮影レンズの組立精度が光軸方向にバラツクことなく、高精度に保つことができる。   Further, when the plastic lenses 3, 4, 5 are stacked, the first and second step protrusions 4d, 3d and the first and second step recesses 5e, 4h are fitted together. The top portions 3f, 4i of the step protrusions 4d, 3d abut against the first and second receiving surfaces 5c, 4g of the first and second step recesses 5e, 4h, and the first and second placement surfaces 4a, 3a. And gaps t1 and t2 corresponding to the thickness of the inner light shielding plates 6 and 7 are formed between the first and second holding surfaces 5a and 4e. Since the gaps t1 and t2 do not change due to the variation in thickness or the bending of the inner light shielding plates 6 and 7 due to the pressing force received from the lenses 3, 4, and 5, the assembly accuracy of the assembled photographic lens varies in the optical axis direction. And high accuracy can be maintained.

以上、本発明の実施例について詳述したが、本発明は、前記実施例に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。例えば、各レンズの形状や各レンズの光軸を合わせるために嵌合構造やレンズの枚数やレンズの押え構造といった基本的構成は適宜選定すればよい。また、各プラスチックレンズを位置決めする段差凹部と段差凸部の形状なども適宜選定すればよい。   As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in order to match the shape of each lens and the optical axis of each lens, basic structures such as a fitting structure, the number of lenses, and a lens pressing structure may be appropriately selected. Further, the shape of the step concave portion and the step convex portion for positioning each plastic lens may be appropriately selected.

本発明の一実施例を示す撮影レンズの断面図である。It is sectional drawing of the imaging lens which shows one Example of this invention. 同上、構成部品の分解状態を示す一部を省略した断面図である。It is sectional drawing which abbreviate | omitted one part which shows the decomposition | disassembly state of a component same as the above. 同上、レンズの重ね合わせ部分の拡大断面図である。It is an enlarged sectional view of the overlapping part of a lens same as the above. 従来例を示す撮影レンズの断面図である。It is sectional drawing of the imaging lens which shows a prior art example.

符号の説明Explanation of symbols

１ 撮影レンズ
２ 鏡筒
３,４,５ プラスチックレンズ
３ａ 第２の載置面
３ｂ 内向きテーパ面
３ｃ 第２の段差凸面
３ｄ 第２の段差凸部
３ｆ，４i 頂部
４ａ 第１の載置面
４ｂ 内向きテーパ面
４ｃ 第１の段差凸面
４ｄ 第１の段差凸部
４ｅ 第２の保持面
４ｆ 外向きテーパ面
４ｇ 第２の受面
４ｈ 第２の段差凹部
５ａ 第１の保持面
５ｂ 外向きテーパ面
５ｃ 第１の受面
５ｅ 第１の段差凹部
６,７ 内遮光板
８ ガラスレンズ
Ｓ 光軸
ｔ１，ｔ２ 隙間
DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Lens tube 3, 4, 5 Plastic lens 3a 2nd mounting surface 3b Inward taper surface 3c 2nd level | step difference convex surface 3d 2nd level | step difference convex part 3f, 4i Top part 4a 1st mounting surface 4b Inwardly tapered surface 4c First step convex surface 4d First step convex portion 4e Second holding surface 4f Outward tapered surface 4g Second receiving surface 4h Second step concave portion 5a First holding surface 5b Outward taper Surface 5c 1st receiving surface 5e 1st level | step difference recessed part 6, 7 Inner light shielding plate 8 Glass lens S Optical axis t1, t2 Gap

Claims (4)

下段プラスチックレンズと、中間プラスチックレンズと、上段プラスチックレンズと、この上段プラスチックレンズの上面に配置されるガラスレンズによって構成される複数のレンズと、前記各プラスチックレンズの間に介在する内遮光板とを光軸方向に重ね合わせて収容するとともに、外周中央部にフォーカス調整雄螺子部を有する鏡筒とを備えた撮影レンズであって、前記下段側のレンズに前記内遮光板を載置する載置面と、この載置面の外周縁から傾斜状に立ち上がる内向きテーパ面と、この内向きテーパ面から外方に向かう段差凸面とを含む段差凸部を形成し、前記上段側のレンズには前記載置面と対向する保持面と、この保持面の外周縁から傾斜状に立ち上がる外向きテーパ面と、この外向きテーパ面から外方に向かう受面とを含む段差凹部を形成し、前記各レンズを積み重ねて鏡筒内に収容する際、前記段差凸部と段差凹部のテーパ面を相互に面接触させて上下各レンズの光軸を位置合わせするとともに、前記上段プラスチックレンズを前記鏡筒の上部側に圧入して前記上下各レンズの光軸と前記鏡筒の中心とを位置合わせし、かつ、前記段差凸面の頂部を前記受面に突き当てて前記載置面と保持面との間に前記内遮光板の板厚に相当する隙間を形成したことを特徴とする撮影レンズ。 A lower plastic lens, an intermediate plastic lens, an upper plastic lens, a plurality of lenses constituted by glass lenses disposed on the upper surface of the upper plastic lens, and an inner light-shielding plate interposed between the plastic lenses; A photographic lens including a lens barrel having a focus adjustment male screw portion at the center of the outer periphery while being stacked and accommodated in the optical axis direction, and mounting the inner light shielding plate on the lower lens A stepped convex portion including a surface, an inwardly tapered surface rising in an inclined manner from the outer peripheral edge of the mounting surface, and a stepped convex surface directed outward from the inwardly tapered surface. A holding surface facing the mounting surface, an outwardly tapered surface rising from the outer peripheral edge of the holding surface, and a receiving surface facing outward from the outwardly tapered surface. When forming step recesses and stacking the lenses in the lens barrel, the step protrusions and the tapered surfaces of the step recesses are brought into surface contact with each other to align the optical axes of the upper and lower lenses, and The upper plastic lens is press-fitted into the upper side of the lens barrel to align the optical axes of the upper and lower lenses with the center of the lens barrel , and the top of the stepped convex surface is abutted against the receiving surface. A photographic lens , wherein a gap corresponding to the thickness of the inner light shielding plate is formed between the mounting surface and the holding surface . 前記内遮光板が合成樹脂によって成形されていることを特徴とする請求項１記載の撮影レンズ。 The photographic lens according to claim 1, wherein the inner light shielding plate is formed of a synthetic resin . 前記テーパ面の仮想延長線の交点が鏡筒の中心と同一軸線上であることを特徴とする請求項１又は２記載の撮影レンズ。 The photographing lens according to claim 1 or 2, wherein the intersection of the virtual extension lines of the tapered surface is on the same axis as the center of the lens barrel . 請求項１乃至３のいずれかに記載の撮影レンズを用いたことを特徴とする光学機器。 An optical apparatus using the photographing lens according to any one of claims 1 to 3 .
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