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JP5014624B2 - 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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JP5014624B2
JP5014624B2 JP2005357613A JP2005357613A JP5014624B2 JP 5014624 B2 JP5014624 B2 JP 5014624B2 JP 2005357613 A JP2005357613 A JP 2005357613A JP 2005357613 A JP2005357613 A JP 2005357613A JP 5014624 B2 JP5014624 B2 JP 5014624B2
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lens
plastic
barrel
lenses
optical axis
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JP2007163656A (en
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浩 渡辺
徹 平松
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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、積み重ねたレンズを相互に位置合わせてして光軸を一致させて調芯す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 that can align the optical axes by aligning the stacked lenses and align the optical axes, and an optical device 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いる。このような複数のレンズを組み合わせた撮影レンズは、各レンズの光軸を相互に一致させ、その光軸が鏡筒の中心となるように組み付ける必要があり、これらが狂うと光学性能が著しく低下する。このため、例えば、特許文献1に開示される撮影レンズは、外径に差のある複数のレンズを鏡筒内に固定した撮影レンズが開示されている。この撮影レンズは、鏡筒の内面に2段の段差が形成され、大径の段差部には物体側を押え環により固定された第1レンズが組み込まれ、小径の段差部には物体側が第1レンズに当接された第2レンズと、第2、第3レンズの間に介装されて第2、第3レンズの間隔を規定する絞りを兼ねた間隔環と、物体側が間隔環に当接され像側が鏡筒の内方フランジに当接された第3レンズとが嵌め込まれている。   2. Description of the Related Art Conventionally, photographing lenses in which a plurality of lenses including a plastic lens and a glass lens are fixed in a lens barrel are known. Such a photographic lens that combines multiple lenses must be assembled so that the optical axes of each lens coincide with each other and the optical axes are at the center of the lens barrel. To do. For this reason, for example, the photographic lens disclosed in Patent Document 1 discloses a photographic lens in which a plurality of lenses having different outer diameters are fixed in a lens barrel. In this photographic lens, two steps are formed on the inner surface of the lens barrel, a first lens in which the object side is fixed by a press ring is incorporated in the large-diameter step portion, and the object side is the first in the small-diameter step portion. A second lens that is in contact with one lens, a spacing ring that is interposed between the second and third lenses and serves as a diaphragm that defines the spacing between the second and third lenses, and the object side abuts the spacing ring. A third lens that is brought into contact with and in contact with the inner flange of the lens barrel is fitted.

特開平7−5354号公報Japanese Patent Laid-Open No. 7-5354

しかし、このような撮影レンズは、鏡筒の内面に形成する径の異なる段差部にそれぞれ対応したレンズを圧入して鏡筒に対する各レンズを位置決が成されるものの、各レンズを相互に調芯して位置決めするものではなく、各レンズ間における光軸を高精度で一致させることが困難である。このため、例えば、携帯電話などの移動体通信装置に組み込まれるカメラの撮影レンズとしてレンズ同士の光軸を揃えるように相互に調芯して鏡筒内に組み込まれる撮影レンズが開発されている。これは、図3に示すように、鏡筒50に3枚のプラスチックレンズ51,52,53と1枚のガラスレンズ54が組み込まれ、ガラスレンズ54が乗る最上部の上段プラスチックレンズ51と2段目の中間プラスチックレンズ52の重ね合わせ面にそれぞれレンズ51,52の光軸を位置決めするための外向きのテーパ面55と内向きのテーパ面56がそれぞれ形成されている。また、上段プラスチックレンズ51と下段プラスチックレンズ53は、鏡筒50の中心と各レンズ51,53の光軸を一致させるため、各レンズ51,53の外周を鏡筒50の内周面に圧入している。そして、上段プラスチックレンズ51とガラスレンズ54との光軸を合わせるために、上段プラスチックレンズ51の上面中心に環状突部54aが形成され、その内側にガラスレンズ54を配置している。   However, in such a photographing lens, although lenses corresponding to the step portions having different diameters formed on the inner surface of the lens barrel are press-fitted to position each lens with respect to the lens barrel, the lenses are adjusted to each other. Instead of centering and positioning, it is difficult to align the optical axes between the lenses with high accuracy. For this reason, for example, as a photographing lens for a camera incorporated in a mobile communication device such as a mobile phone, a photographing lens that is aligned with each other so that the optical axes of the lenses are aligned and incorporated in a lens barrel has been developed. As shown in FIG. 3, three plastic lenses 51, 52, 53 and one glass lens 54 are incorporated in a lens barrel 50, and the uppermost plastic lens 51 on the uppermost part on which the glass lens 54 is placed is arranged in two stages. An outwardly tapered surface 55 and an inwardly tapered surface 56 for positioning the optical axes of the lenses 51 and 52 are respectively formed on the overlapping surface of the intermediate plastic lens 52 of the eye. Further, the upper plastic lens 51 and the lower plastic lens 53 are press-fitted with the outer periphery of each lens 51, 53 into the inner peripheral surface of the lens barrel 50 in order to make the center of the lens barrel 50 coincide with the optical axis of each lens 51, 53. ing. In order to align the optical axes of the upper plastic lens 51 and the glass lens 54, an annular protrusion 54a is formed at the center of the upper surface of the upper plastic lens 51, and the glass lens 54 is disposed on the inner side.

ところで、プラスチックレンズ51,52,53は金型を用いた一体成形が可能であるから、成形加工も容易で寸法精度も高く成形することが可能であるが、ガラスレンズ54は一品づつ研削によって成形するため、その外径中心と光軸中心を合わせて製作することは可能であるが、外径寸法は大きくバラツクといった欠点を有している。   By the way, the plastic lenses 51, 52, and 53 can be integrally molded using a mold. Therefore, the molding process is easy and the dimensional accuracy can be high, but the glass lens 54 is molded by grinding one by one. Therefore, although it is possible to manufacture the center of the outer diameter and the center of the optical axis, the outer diameter size is large and has a drawback of variation.

このため、環状突部54aとガラスレンズ54との間にはガラスレンズ54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51に対してガラスレンズ54の光軸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。しかし、ガラスレンズ54は、鏡筒50の構造上、鏡筒50内に組み込んだ状態において上段レンズ51に対して光軸を位置合わせすることができない。したがって、鏡筒50に各レンズ51,52,53を組み付けるに当たり、先ず、上段プラスチックレンズ51と2段目の中間プラスチックレンズ52とをそれぞれのテーパ面55,56によって面接触させ、光軸の位置合わせをすることができる。次に上段プラスチックレンズ51とガラスレンズ54との光軸の位置合わせを行う。この上段プラスチックレンズ51とガラスレンズ54との調芯に際し、ダミーの鏡筒に下段プラスチックレンズを組み付けた調芯用治具を用意し、その調芯用治具に一体化した上段及び中間プラスチックレンズ51,52を組み付ける。この時、使用される調芯用治具のダミー鏡筒は上面を開口しており、調芯用治具に組み付けた上段プラスチックレンズ51に対して最上部のガラスレンズ54の調芯作業が行えるようになっている。このようにして予め調芯した上段及び中間プラスチックレンズ51,52を調芯用治具に組み付けてから、上段プラスチックレンズ51の環状突部54aにガラスレンズ54を装着することによって、調芯用治具に組み付けた上段及び中間プラスチックレンズ51,52及びダミーの下段レンズに対してガラスレンズ54との光軸の位置合せを行い、調芯後、上段プラスチックレンズ51とガラスレンズ54を接着材によって一体的に固定することにより、上段及び中間プラスチックレンズ51,52とガラスレンズ54の光軸をそれぞれ位置合わせして調芯を行い、これを最終製品となる鏡筒50に装着する。そして、下段プラスチックレンズ53を鏡筒50に圧入して鏡筒50の中心と下段プラスチックレンズ53の光軸との位置合わせを行う。   Therefore, a clearance for absorbing a molding error of the glass lens 54 is formed between the annular protrusion 54 a and the glass lens 54, and the optical axis of the glass lens 54 is aligned with the upper plastic lens 51. Are bonded and fixed together with an adhesive. However, due to the structure of the lens barrel 50, the glass lens 54 cannot align the optical axis with respect to the upper lens 51 in a state of being incorporated in the lens barrel 50. Therefore, when assembling the lenses 51, 52, 53 to the lens barrel 50, first, the upper plastic lens 51 and the second intermediate plastic lens 52 are brought into surface contact by the respective tapered surfaces 55, 56, and the position of the optical axis is determined. Can be combined. Next, the optical axes of the upper plastic lens 51 and the glass lens 54 are aligned. When aligning the upper plastic lens 51 and the glass lens 54, an alignment jig in which a lower plastic lens is assembled to a dummy barrel is prepared, and the upper and intermediate plastic lenses are integrated with the alignment jig. 51 and 52 are assembled. At this time, the dummy barrel of the alignment jig used has an open upper surface, and the alignment operation of the uppermost glass lens 54 can be performed with respect to the upper plastic lens 51 assembled to the alignment jig. It is like that. The upper and intermediate plastic lenses 51 and 52 pre-aligned in this way are assembled to the alignment jig, and then the glass lens 54 is attached to the annular protrusion 54a of the upper plastic lens 51, whereby the alignment treatment is performed. The optical axis of the glass lens 54 is aligned with the upper and intermediate plastic lenses 51 and 52 and the dummy lower lens assembled to the fixture, and after alignment, the upper plastic lens 51 and the glass lens 54 are integrated with an adhesive. By fixing them, the optical axes of the upper and intermediate plastic lenses 51 and 52 and the glass lens 54 are aligned and aligned, and this is mounted on the lens barrel 50 as the final product. Then, the lower plastic lens 53 is press-fitted into the lens barrel 50 to align the center of the lens barrel 50 with the optical axis of the lower plastic lens 53.

したがって、図3に示す撮影レンズは、上段プラスチックレンズ51と中間プラスチックレンズ52は、それぞれのテーパ面55,56を突き合わせることによって簡単に光軸を合わせることができるが、上段プラスチックレンズ51に組み付けるガラスレンズ54は、調芯用治具に組み付けた状態でないと光軸の調芯が行えない。しかも、調芯用治具を用いて上段及び中間レンズ51,52及びガラスレンズ54を調芯することから、最終的に組み込まれる鏡筒50に対する各レンズ51,52及びガラスレンズ54の調芯は行われないから、最終的に組み込まれる鏡筒50の成形誤差などによって鏡筒50に対する各レンズ51,52及びガラスレンズ54の調芯精度に狂いが生じる虞れもある。さらに、何度も調芯作業を行うことから、作業工程も複雑であるとともに、レンズの調芯作業工程中にレンズにごみや汚れなどの付着する危険性もあり、レンズの精度管理の面でも不利である。   Therefore, in the photographic lens shown in FIG. 3, the upper plastic lens 51 and the intermediate plastic lens 52 can be easily aligned with each other by abutting the respective tapered surfaces 55 and 56, but are assembled to the upper plastic lens 51. If the glass lens 54 is not assembled to the alignment jig, the optical axis cannot be aligned. Moreover, since the upper and intermediate lenses 51 and 52 and the glass lens 54 are aligned using the alignment jig, the alignment of the lenses 51 and 52 and the glass lens 54 with respect to the lens barrel 50 to be finally assembled is Since this is not performed, the alignment accuracy of the lenses 51 and 52 and the glass lens 54 with respect to the lens barrel 50 may be distorted due to a molding error of the lens barrel 50 that is finally incorporated. Furthermore, since the alignment work is performed many times, the work process is complicated, and there is a risk of dust and dirt adhering to the lens during the lens alignment work process. It is disadvantageous.

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、複数のレンズを鏡筒内に固定する際、順次、鏡筒にレンズを組み込みながら複数のレンズ及び鏡筒の光軸合わせを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 circumstances as described above, and in a photographing lens in which a plurality of lenses are positioned and fixed in a lens barrel, when the plurality of lenses are fixed in the lens barrel, the lenses are sequentially attached to the lens barrel. An object of the present invention is to provide a photographing lens capable of surely aligning the optical axes of a plurality of lenses and a lens barrel with high accuracy, and an optical apparatus using the same.

請求項1記載の撮像レンズは、複数のレンズを光軸方向に重ね合わせて鏡筒内に収容する撮影レンズであって、前記鏡筒は、内周底部に載置用フランジ部を有して上面を開口した円筒状に形成されているとともに、前記各レンズは、最上段に配置されるガラスレンズと、その下部に重ね合わせる複数のプラスチックレンズから成り、上段プラスチックレンズの上面中央部に前記ガラスレンズがクリアランスを保って位置決めされる環状突部を形成し、かつ、前記各プラスチックレンズの重ね合わせ面には、これら各プラスチックレンズの光軸を位置合わせするテーパ面をそれぞれ形成し、前記鏡筒の上面開口部から載置用フランジ部に順次、プラスチックレンズを積み重ねて鏡筒内に収容し、その鏡筒内への各レンズの組み付け時において、下段側プラスチックレンズのテーパ面に上段側プラスチックレンズのテーパ面を面接触して各レンズの光軸を位置合わせし、各プラスチックレンズを相互に位置決めした状態で前記上段プラスチックレンズの環状突部の内側に前記ガラスレンズを配置し、その上段プラスチックレンズの光軸に対してガラスレンズの光軸を位置合わせした後、上段プラスチックレンズとガラスレンズとを接着剤で一体化した状態で、前記鏡筒の上面開口に固定保持部材を装着し、この固定保持部材と前記載置用フランジ部とで前記各プラスチックレンズを挟着することによって、各レンズを光軸方向に押えたことを特徴とする。
The imaging lens according to claim 1 is a photographing lens in which a plurality of lenses are stacked in the optical axis direction and accommodated in a lens barrel, and the lens barrel has a mounting flange portion at an inner peripheral bottom portion. The lens is formed in a cylindrical shape having an upper surface opened, and each lens is composed of a glass lens arranged at the uppermost stage and a plurality of plastic lenses superimposed on the lower part thereof, and the glass is arranged at the upper surface central part of the upper plastic lens An annular protrusion for positioning the lens with a clearance is formed, and a taper surface for aligning the optical axes of the plastic lenses is formed on the overlapping surface of the plastic lenses. The plastic lenses are sequentially stacked from the upper surface opening to the mounting flange and accommodated in the lens barrel, and when assembling each lens in the lens barrel, The tapered surface of the upper plastic lens is in surface contact with the tapered surface of the upper plastic lens to align the optical axes of the lenses, and the inner side of the annular protrusion of the upper plastic lens with the plastic lenses positioned relative to each other. The glass lens is disposed on the optical lens, and the optical axis of the glass lens is aligned with the optical axis of the upper plastic lens, and then the upper plastic lens and the glass lens are integrated with an adhesive. mounting the fixing member on the upper opening, by pinched the previous SL each plastic lens and the fixed holding member and the front according置用flange, characterized in that pressing each lens in the optical axis direction.

請求項2の撮影レンズは、請求項1の撮影レンズにおいて、前記各プラスチックレンズのうちの一つのプラスチックレンズの外周面を前記鏡筒の内周面に圧入して該プラスチックレンズの光軸と鏡筒の中心と一致させて調芯を行い、他のプラスチックレンズは、鏡筒との間にクリアランスが形成されていることを特徴とする。 Of the imaging lens according to claim 2, in the imaging lens according to claim 1, wherein the outer peripheral surface of one plastic lens is press-fitted to the inner peripheral surface of the lens barrel optical axis and the lens of the plastic lens of the plastic lens Alignment is performed by matching the center of the tube, and the other plastic lens is characterized in that a clearance is formed between the tube and the lens barrel.

請求項の撮影レンズは、請求項1又は2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。 According to a third aspect of the present invention, there is provided the photographing lens according to the first or second aspect, wherein the intersection of the virtual extension lines of the tapered surface is on the same axis as the center of the lens barrel.

請求項の光学機器は、請求項乃至のいずれかに記載の撮影レンズを用いたものである。 An optical apparatus according to a fourth aspect uses the photographing lens according to any one of the first to third aspects.

請求項1の撮影レンズによれば、複数のレンズを光軸方向に重ね合わせて鏡筒内に収容する撮影レンズであって、前記鏡筒は、内周底部に載置用フランジ部を有して上面を開口した円筒状に形成されているとともに、前記各レンズは、最上段に配置されるガラスレンズと、その下部に重ね合わせる複数のプラスチックレンズから成り、上段プラスチックレンズの上面中央部に前記ガラスレンズがクリアランスを保って位置決めされる環状突部を形成し、かつ、前記各プラスチックレンズの重ね合わせ面には、これら各プラスチックレンズの光軸を位置合わせするテーパ面をそれぞれ形成し、前記鏡筒の上面開口部から載置用フランジ部に順次、プラスチックレンズを積み重ねて鏡筒内に収容し、その鏡筒内への各レンズの組み付け時において、下段側プラスチックレンズのテーパ面に上段側プラスチックレンズのテーパ面を面接触して各レンズの光軸を位置合わせし、各プラスチックレンズを相互に位置決めした状態で前記上段プラスチックレンズの環状突部の内側に前記ガラスレンズを配置し、その上段プラスチックレンズの光軸に対してガラスレンズの光軸を位置合わせした後、上段プラスチックレンズとガラスレンズとを接着剤で一体化した状態で、前記鏡筒の上面開口に固定保持部材を装着し、この固定保持部材と前記載置用フランジ部とで前記各プラスチックレンズを挟着することによって、各レンズを光軸方向に押えたものであるから、鏡筒の上面開口部から順次、レンズを挿入し、その各レンズの重ね合わせ面に形成されたテーパ面によって各レンズの光軸を調芯しながら鏡筒の載置用フランジ部上に積み重ねて鏡筒に組み込むことができる。このため、専用の調芯用治具を用いることなく、鏡筒に対する全てのプラスチックレンズの光軸の位置合わせが完了した後、最上部に位置する上段プラスチックレンズを含む全てのプラスチックレンズとガラスレンズとの光軸を調芯することで全てのレンズは鏡筒に組み込んだ状態で調芯作業を行うことができ、簡単に調芯が行えることから、調芯作業工程を削減し、調芯作業時に微細なごみや塵あるいは汚れなどがレンズに付着することを可及的に抑制することができるとともに、大幅な作業工程の短縮化が可能となる。 According to another aspect of the present invention, there is provided a photographic lens in which a plurality of lenses are stacked in the optical axis direction and accommodated in a lens barrel, and the lens barrel has a mounting flange portion at an inner peripheral bottom portion. Each of the lenses is composed of a glass lens arranged at the uppermost stage and a plurality of plastic lenses superimposed on the lower part, and the upper plastic lens has a central part on the upper surface thereof. The glass lens forms an annular protrusion that is positioned with a clearance, and the overlapping surface of each plastic lens is formed with a tapered surface that aligns the optical axis of each plastic lens. The plastic lenses are stacked in order from the top opening of the tube to the mounting flange, and then stored in the lens barrel. When assembling each lens in the lens barrel The tapered surface of the upper plastic lens is in surface contact with the tapered surface of the lower plastic lens so that the optical axes of the lenses are aligned, and the inner side of the annular protrusion of the upper plastic lens with the plastic lenses positioned relative to each other. The glass lens is disposed on the optical lens, and the optical axis of the glass lens is aligned with the optical axis of the upper plastic lens, and then the upper plastic lens and the glass lens are integrated with an adhesive. mounting the fixing member on the upper opening, by pinched the previous SL each plastic lens and the fixed holding member and the front according置用flange, since it is that pressing the lenses in the optical axis direction, the mirror Lenses are inserted sequentially from the top opening of the cylinder, and the optical axis of each lens is aligned by a tapered surface formed on the overlapping surface of each lens. It can be incorporated into the lens barrel stacked reluctant barrel mounting flange on. For this reason, all plastic lenses and glass lenses including the upper plastic lens located at the uppermost position after the alignment of the optical axes of all the plastic lenses with respect to the lens barrel is completed without using a dedicated alignment jig. By aligning the optical axis with the lens, all lenses can be centered while being assembled in the lens barrel and can be easily centered. It is possible to suppress as much as possible fine dust, dust or dirt from adhering to the lens as much as possible, and to greatly shorten the work process.

請求項2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、前記各プラスチックレンズのうちの一つのプラスチックレンズの外周面を前記鏡筒の内周面に圧入して該プラスチックレンズの光軸と鏡筒の中心と一致させて調芯を行い、他のプラスチックレンズは、鏡筒との間にクリアランスが形成されているから、鏡筒に組み込みながら各レンズの調芯を行うとともに、少なくとも一つのレンズを鏡筒に圧入することによって、鏡筒の中心に対するレンズの調芯を行うことができ、そのレンズと他のレンズはそれぞれの重ね合わせ面に形成されたテーパ面によって光軸の調芯が成されているため、鏡筒に対する全てのレンズの光軸の位置合わせが一つのレンズを鏡筒に圧入することによって可能となる。 According to the photographic lens according to claim 2, in the photographing lens according to claim 1, wherein the light of one of the outer peripheral surface of the plastic lens was pressed into the inner peripheral surface of the barrel the plastic lens of the plastic lens is matched with the center of the shaft and the barrel performed by aligning the other plastic lenses, because the clearance is formed between the lens barrel, it performs alignment of the lenses while embedded in the lens barrel, By press-fitting at least one lens into the lens barrel, it is possible to align the lens with respect to the center of the lens barrel. Since the alignment is made, the optical axes of all the lenses can be aligned with the lens barrel by press-fitting one lens into the lens barrel.

請求項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 imaging lens according to claim 3, in claim 1 or 2 Symbol mounting of the photographing lens, because the intersection of the virtual extension line of the tapered surface is the center of the same axis of the barrel, superposition of each lens surface 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.

請求項の光学機器によれば、請求項1乃至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 apparatus of 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 apparatus 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及び図2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に示す撮影レンズの分解状態を示す断面図であり、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 a cross-sectional view showing an exploded state of the photographic lens shown in FIG. 1, and the photographic lens 1 of the present embodiment includes a lens barrel 2, Plastic lenses 3, 4, and 5 made of plastic material, inner light shielding plates 6 and 7 interposed between the plastic lenses 3, 4, and 5, and a glass lens 8 disposed on the upper plastic lens 5 are fixed. It is comprised from the 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と螺着する雌螺子部2aが形成され、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. In addition, a male screw portion 9a formed on the outer peripheral surface of the fixed holding member 9 and a female screw portion 2a to be screwed are formed on the upper inner peripheral surface of the opening, and the lower plastic lens 3, After 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 and accommodated in the lens barrel 2, the fixed holding member 9 is attached to the female screw portion 2 a of the lens barrel 2. By screwing the male screw portion 9a, 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 accommodated in the lens barrel 2 are pressed 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の平坦部5a、外向き円錐状のテーパ面5b、第2の平坦部5cが同心円状に形成されている。   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 flat portion 5a, the outward conical tapered surface 5b, and the second flat portion 5c are formed concentrically in order from the first.

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は、その凹レンズ面、凸レンズ面の外周部に位置して表裏面にそれぞれ第1及び第2の平坦面4a,4bを有する平板部4cと、内面及び外面にそれぞれ円錐状のテーパ面4d,4eを有する傾斜壁4fと、下面に第3の平坦面4gを有する鍔部4hが同心円状に形成されている。   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 intermediate plastic lens 4 has a concave lens surface, a flat plate portion 4c having first and second flat surfaces 4a and 4b on the front and back surfaces located on the outer peripheral portion of the convex lens surface, and conical shapes on the inner surface and outer surface, respectively. An inclined wall 4f having tapered surfaces 4d and 4e and a flange 4h having a third flat surface 4g on the lower surface are formed concentrically.

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、凹レンズ面及び凸レンズ面の外周には前記載置用フランジ部10に載置するための表裏に平坦部3a,3bを有する鍔部3cが同心円状に形成され、この鍔部3cの上面側には中間プレスチックレンズ4を位置決めするために、内向きのテーパ面3dを有する突状部3eが突設されている。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3d,4d,4e,5bが形成され、これらテーパ面3d,4d,4e,5bをそれぞれ面接触させて嵌合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,4d,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とを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 flat portions 3a on the front and back for mounting on the mounting flange portion 10 on the outer periphery of the concave lens surface and the convex lens surface. , 3b are formed concentrically, and a protrusion 3e having an inwardly tapered surface 3d is provided on the upper surface side of the flange 3c so as to position the intermediate plastic lens 4 in a protruding manner. ing. In this way, the respective plastic lenses 3, 4, 5 are formed with tapered surfaces 3d, 4d, 4e, 5b on the respective overlapping surfaces, and these tapered surfaces 3d, 4d, 4e, 5b are brought into surface contact with each other. By fitting, the optical axes S of the plastic lenses 3, 4, and 5 are aligned. That is, the intersections of the virtual extension lines of the tapered surfaces 3d, 4d, 4e, and 5b coincide 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 is aligned with the optical axis S of the upper plastic lens 5. 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平坦面3a,4a,4b,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 or the like, and the inner diameter portions function as throttle holes 6a and 7a. Each of the inner light shielding plates 6 and 7 is interposed between flat surfaces 3a, 4a, 4b, and 5a located on the overlapping surface of the plastic lenses 3, 4, and 5.

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の上面開口部が開放しており、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に内遮光板6を介在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の突状部3eに形成された内向きのテーパ面3dと中間プラスチックレンズ4の傾斜壁4fに形成に外向きのテーパ面4e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に内遮光板7を介在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の傾斜壁4fに形成された内向きのテーパ面4dと上段プラスチックレンズ5の外向きのテーパ面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が位置合わせされ、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の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。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 intermediate plastic lens 4 is superimposed on the lower plastic lens 3 with the inner light shielding plate 6 interposed, the inwardly tapered surface 3d formed on the protruding portion 3e of the lower plastic lens 3 and the intermediate plastic lens 4 are formed. An outwardly tapered surface 4e is fitted to the inclined wall 4f so that the optical axes S of the lower plastic lens 3 and the intermediate plastic lens 4 are aligned. Further, when the upper plastic lens 5 is superimposed on the intermediate plastic lens 4 with the inner light shielding plate 7 interposed, the inwardly tapered surface 4d formed on the inclined wall 4f of the intermediate plastic lens 4 and the upper plastic lens 5 facing outward. And the optical axis S of the upper plastic lens 5 and the intermediate plastic lens 4 are aligned, thereby aligning the optical axes S of the plastic lenses 3, 4 and 5, respectively. The 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 the optical axes S of the plastic lenses 3, 4, 5 inserted in the lens barrel 2 are aligned, and the upper plastic lens 5 to be inserted last is attached to the lens barrel 2. The plastic lens 3, 4, 5 is aligned with the lens barrel 2 by press-fitting into the lens barrel 2, and finally, the plastic lens 3, 4 is pressed into the lens barrel 2 by press-fitting the upper plastic lens 5. , 5 are integrated. 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3d,4d,4e,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。このため、従来のように、鏡筒2にセットする前に予めプラスチックレンズの調芯を行ってから調芯用治具を用いて調芯されたプラスチックレンズに対するガラスレンズの調芯を行うといった複雑な調芯作業を行うことなく、極めて簡単にレンズの調芯が行える。しかも、最終製品となる鏡筒2に順次、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を順次挿入しながら調芯が行えるから、組み立てた撮影レンズ1の精度も高度に保つことができる。また、調芯に伴う作業工程も少ないから、これらの作業時に微細なごみや塵あるいは汚れなどがレンズに付着することを防止することができ、また、大幅な作業工程の短縮化も可能となる。   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 3d, 4d, 4e, 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. For this reason, as in the prior art, the plastic lens is aligned before the lens barrel 2 is set, and then the glass lens is aligned with respect to the plastic lens that has been aligned using the alignment jig. The lens can be aligned very easily without the need for an alignment process. Moreover, since 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 inserted into the lens barrel 2 as the final product, the assembled photographing can be performed. The accuracy of the lens 1 can also be kept high. In addition, since there are few work processes associated with alignment, it is possible to prevent fine dust, dust, dirt, and the like from adhering to the lens during these work operations, and it is possible to greatly shorten the work process.

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。   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.

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、撮影レンズの分解状態を示す一部を省略した断面図である。FIG. 3 is a cross-sectional view in which a part of the exploded state of the photographing lens is omitted. 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
3d,4d,4e,5b テーパ面
8 ガラスレンズ
9 固定保持部材
10 載置用フランジ部
15 環状突部
S 光軸
DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Lens tube 3, 4, 5 Plastic lens 3d, 4d, 4e, 5b Tapered surface 8 Glass lens 9 Fixing holding member 10 Mounting flange part 15 Annular protrusion S Optical axis

Claims (4)

複数のレンズを光軸方向に重ね合わせて鏡筒内に収容する撮影レンズであって、前記鏡筒は、内周底部に載置用フランジ部を有して上面を開口した円筒状に形成されているとともに、前記各レンズは、最上段に配置されるガラスレンズと、その下部に重ね合わせる複数のプラスチックレンズから成り、上段プラスチックレンズの上面中央部に前記ガラスレンズがクリアランスを保って位置決めされる環状突部を形成し、かつ、前記各プラスチックレンズの重ね合わせ面には、これら各プラスチックレンズの光軸を位置合わせするテーパ面をそれぞれ形成し、前記鏡筒の上面開口部から載置用フランジ部に順次、プラスチックレンズを積み重ねて鏡筒内に収容し、その鏡筒内への各レンズの組み付け時において、下段側プラスチックレンズのテーパ面に上段側プラスチックレンズのテーパ面を面接触して各レンズの光軸を位置合わせし、各プラスチックレンズを相互に位置決めした状態で前記上段プラスチックレンズの環状突部の内側に前記ガラスレンズを配置し、その上段プラスチックレンズの光軸に対してガラスレンズの光軸を位置合わせした後、上段プラスチックレンズとガラスレンズとを接着剤で一体化した状態で、前記鏡筒の上面開口に固定保持部材を装着し、この固定保持部材と前記載置用フランジ部とで前記各プラスチックレンズを挟着することによって、各レンズを光軸方向に押えたことを特徴とする撮影レンズ。
A photographic lens in which a plurality of lenses are stacked in the optical axis direction and accommodated in a lens barrel, and the lens barrel is formed in a cylindrical shape having a mounting flange portion on an inner peripheral bottom portion and having an upper surface opened. In addition, each lens is composed of a glass lens arranged at the uppermost stage and a plurality of plastic lenses superimposed on the lower part thereof, and the glass lens is positioned with a clearance at the center of the upper surface of the upper plastic lens. An annular protrusion is formed, and a taper surface for aligning the optical axis of each plastic lens is formed on the overlapping surface of each plastic lens, and a mounting flange is formed from the upper surface opening of the lens barrel. Plastic lenses are stacked on top of each other and accommodated in the lens barrel. When each lens is assembled in the lens barrel, the lower plastic lens The taper surface of the upper plastic lens is brought into surface contact with the surface to align the optical axis of each lens, and the glass lens is placed inside the annular protrusion of the upper plastic lens in a state where the plastic lenses are mutually positioned. After positioning and aligning the optical axis of the glass lens with the optical axis of the upper plastic lens, the upper plastic lens and the glass lens are integrated with an adhesive and fixed and held in the upper opening of the lens barrel. member is mounted, by pinched the previous SL each plastic lens and the fixed holding member and the front according置用flange, taking lens, characterized in that pressing each lens in the optical axis direction.
前記各プラスチックレンズのうちの一つのプラスチックレンズの外周面を前記鏡筒の内周面に圧入して該プラスチックレンズの光軸と鏡筒の中心と一致させて調芯を行い、他のプラスチックレンズは、鏡筒との間にクリアランスが形成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 perform one central and matched so by aligning the optical axis and the lens barrel of the plastic lens is press-fitted to the inner peripheral surface of the barrel to the outer peripheral surface of the plastic lens out of the plastic lenses, other plastics The photographing lens according to claim 1, wherein a clearance is formed between the lens and the lens barrel. 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項又は2に記載の撮影レンズ。 The photographing lens according to claim 1, 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の何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 .
JP2005357613A 2005-12-12 2005-12-12 Photography lens and optical apparatus using the photography lens Active JP5014624B2 (en)

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CN103728705B (en) * 2012-10-16 2017-03-08 玉晶光电(厦门)有限公司 The imaging lens of spurious rays can be eliminated
JP6234676B2 (en) * 2012-12-20 2017-11-22 日本電産サンキョー株式会社 Lens unit
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US10371954B2 (en) 2014-06-10 2019-08-06 Ams Sensors Singapore Pte. Ltd. Optoelectronic modules including hybrid arrangements of beam shaping elements, and imaging devices incorporating the same
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