JP2007052096A

JP2007052096A - Lens unit

Info

Publication number: JP2007052096A
Application number: JP2005235741A
Authority: JP
Inventors: Hiroyuki Ishitomi; 裕之石富; Toshinari Noda; 俊成野田
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2005-08-16
Filing date: 2005-08-16
Publication date: 2007-03-01

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens unit that has a plurality of lenses on the internal circumferential face of its cylindrical part, the lens unit being designed such that miniaturization is achieved by holding the lenses within a lens barrel without using an adhesive and, at the same time, accuracy in positioning the lenses is improved. <P>SOLUTION: The lens 103 is pressed and inserted into the cylindrical part 102b of the lens 102. The flange part 102c of the lens 102 and the internal circumferential part 101c of the lens barrel 101 have a tapering shape. This makes it possible to provide the lens unit in which miniaturization is achieved and accuracy in positioning the lenses is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、コンパクトデジタルカメラやモバイル用カメラ等に用いられるレンズユニットに関するものである。 The present invention relates to a lens unit used for a compact digital camera, a mobile camera, and the like.

従来のレンズユニットについて図３を参照しながら説明する。 A conventional lens unit will be described with reference to FIG.

図３は従来のレンズユニットを示す図である。 FIG. 3 is a diagram showing a conventional lens unit.

図３において、１０はレンズ、１１は鏡筒、１２は支持部、１３は間隔、１４は接着剤である。このような構成において、レンズ１０の外周面と鏡筒１１内周面によって形成される間隔１３に接着剤１４を充填し、レンズ１０を光軸方向で支持部１２において位置決めすることでレンズ１０と鏡筒１１を一体化させていた。 In FIG. 3, 10 is a lens, 11 is a lens barrel, 12 is a support portion, 13 is an interval, and 14 is an adhesive. In such a configuration, the gap 13 formed by the outer peripheral surface of the lens 10 and the inner peripheral surface of the lens barrel 11 is filled with the adhesive 14, and the lens 10 is positioned on the support portion 12 in the optical axis direction. The lens barrel 11 was integrated.

例えばその先行技術としては下記の特許文献が挙げられる。
特開平２−６６５０６号公報 For example, the following patent documents can be cited as the prior art.
JP-A-2-66506

しかしながら前記従来の構成では、以下のような問題を有していた。つまり、小型化が求められるレンズユニットにおいては、レンズの焦点距離が重要になることから、鏡筒１１内におけるレンズ１０の位置精度が高度に要求されるものである。しかし、従来技術では、接着剤１４の硬化時に発生するガスがレンズユニット内部に充満し、硬化時においてはレンズ１０を持ち上げてしまい、レンズ１０の位置精度が低下するといった問題が生じていた。また、接着剤１４が間隔１３からはみ出し、レンズユニットの信頼性が低下してしまうという問題も有していた。 However, the conventional configuration has the following problems. In other words, in a lens unit that is required to be downsized, the focal length of the lens is important, and therefore the positional accuracy of the lens 10 in the lens barrel 11 is highly required. However, in the prior art, a gas generated when the adhesive 14 is cured is filled in the lens unit, and the lens 10 is lifted during the curing, resulting in a problem that the positional accuracy of the lens 10 is lowered. In addition, the adhesive 14 protrudes from the interval 13, and there is a problem that the reliability of the lens unit is lowered.

そこで本発明は、鏡筒内周面に複数のレンズを設けたレンズユニットにおいて、小型化を実現し、同時にレンズの位置精度を高めたレンズユニットを提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens unit in which a plurality of lenses are provided on the inner peripheral surface of the lens barrel, and the lens unit is miniaturized and at the same time the positional accuracy of the lens is increased.

そしてこのような目的を達成するために本発明は、第一のレンズの筒部に第二のレンズを押圧挿入したものである。 In order to achieve such an object, in the present invention, the second lens is pressed and inserted into the cylindrical portion of the first lens.

この構成により、第一のレンズに第二のレンズを押圧挿入することによって、接着剤を用いることなく複数のレンズを鏡筒内に組み込むことができる。従って、接着剤の硬化時におけるレンズの位置ズレを防ぎ、小型でかつ位置精度を高めたレンズユニットを提供することができる。 With this configuration, by pressing and inserting the second lens into the first lens, a plurality of lenses can be incorporated into the lens barrel without using an adhesive. Accordingly, it is possible to provide a lens unit that is small in size and has high positional accuracy, while preventing the positional deviation of the lens when the adhesive is cured.

（実施の形態１）
以下、実施の形態１におけるレンズユニットにおいて、図を用いて説明する。 (Embodiment 1)
Hereinafter, the lens unit in Embodiment 1 will be described with reference to the drawings.

図１は本実施の形態におけるレンズユニットの斜視図、図２は図１のＩ−Ｉ線でレンズユニットを切断した場合の断面図である。 FIG. 1 is a perspective view of a lens unit according to the present embodiment, and FIG. 2 is a cross-sectional view of the lens unit taken along line II in FIG.

図１、図２に示すごとく、本実施の形態のレンズユニットはポリカーボネート等の樹脂からなる鏡筒１０１と、鏡筒１０１内に取り付けられたレンズ１０２、１０３とを備えている。 As shown in FIGS. 1 and 2, the lens unit according to the present embodiment includes a lens barrel 101 made of a resin such as polycarbonate, and lenses 102 and 103 attached in the lens barrel 101.

ここで、レンズ１０２はレンズ部１０２ａを備えた有天円筒状とし、この有天円筒状のレンズ１０２の筒部１０２ｂ内に、円板状のレンズ１０３の外周でレンズ１０２の筒部１０２ｂ内周を円周方向外方に押圧するように押し込んだ構成となっている。このように、レンズ１０２にレンズ１０３を押圧挿入することにより、より低背化を実現したレンズユニットを提供できる。 Here, the lens 102 has a cylindrical cylindrical shape having a lens portion 102a, and the cylindrical portion 102b of the lenticular cylindrical lens 102 has an outer periphery of the disk-shaped lens 103 and an inner periphery of the cylindrical portion 102b of the lens 102. Is pushed in so as to be pushed outward in the circumferential direction. In this way, by pressing and inserting the lens 103 into the lens 102, it is possible to provide a lens unit that achieves a lower profile.

また、レンズ１０３をレンズ１０２よりも硬くすることで、レンズ１０３の外周部にレンズ１０２の筒部１０２ｂを押し込む際に、レンズ１０２の筒部の内部を変形させ、この押し込み作業を行いやすくすることができる。また、押し込んだ後にレンズ１０３を安定して保持することが可能となる。 Further, by making the lens 103 harder than the lens 102, when the cylindrical portion 102b of the lens 102 is pushed into the outer peripheral portion of the lens 103, the inside of the cylindrical portion of the lens 102 is deformed to facilitate this pushing operation. Can do. In addition, the lens 103 can be stably held after being pushed in.

加えて、レンズ１０２の筒部１０２ｂの内周部に支持部を設けて、レンズ１０３の外周部を当接させることもできる。この構成により、より確実に鏡筒内でのレンズ１０２、レンズ１０３の位置決めが可能となる。 In addition, a support portion may be provided on the inner peripheral portion of the cylindrical portion 102b of the lens 102 so that the outer peripheral portion of the lens 103 is brought into contact therewith. With this configuration, the lens 102 and the lens 103 can be positioned in the lens barrel more reliably.

また、鏡筒１０１の内周部１０１ｃはテーパー形状に形成し、レンズ１０２の外周にもテーパー形状のフランジ部１０２ｃを設けた。ここで、鏡筒１０１の内周部１０１ｃとレンズ１０２のフランジ部１０２ｃは、鏡筒の開口部１０１ａから開口部１０１ｂに向かって径が広がるテーパー形状とした。この構成により、開口部１０１ｂからレンズ１０２を挿入し、鏡筒１０１内に保持する際に、定位置に精度よく挿入、保持することが可能となる。 The inner peripheral portion 101 c of the lens barrel 101 is formed in a tapered shape, and a tapered flange portion 102 c is also provided on the outer periphery of the lens 102. Here, the inner peripheral portion 101c of the lens barrel 101 and the flange portion 102c of the lens 102 have a tapered shape whose diameter increases from the opening 101a of the lens barrel toward the opening 101b. With this configuration, when the lens 102 is inserted from the opening 101b and held in the lens barrel 101, it can be accurately inserted and held at a fixed position.

加えて、鏡筒１０１の内周部１０１ｃのテーパー角は、レンズ１０２のフランジ部１０２ｃのテーパー角と同じ角度か、またはそれよりも小さい角度とする。 In addition, the taper angle of the inner peripheral portion 101 c of the lens barrel 101 is the same as or smaller than the taper angle of the flange portion 102 c of the lens 102.

この構成により、鏡筒１０１にレンズ１０２を確実に精度よく挿入することができ、前記鏡筒１０１の内周部１０１ｃでレンズ１０２のフランジ部１０２ｃを精度よく定位置に弾性保持することができる。 With this configuration, the lens 102 can be reliably inserted into the lens barrel 101 with high accuracy, and the flange portion 102c of the lens 102 can be elastically held in place with high accuracy by the inner peripheral portion 101c of the lens barrel 101.

また、鏡筒１０１の内周部と、レンズ１０２のフランジ部１０２ｃの外周部と、レンズ１０２の筒部１０２ｂの内周部を粗面として形成する。ただし、レンズ１０２がガラス製である場合はレンズ１０２に粗面を形成しにくいため、鏡筒１０１の内周面にのみ粗面を形成してもよい。 Further, the inner peripheral portion of the lens barrel 101, the outer peripheral portion of the flange portion 102c of the lens 102, and the inner peripheral portion of the cylindrical portion 102b of the lens 102 are formed as rough surfaces. However, when the lens 102 is made of glass, it is difficult to form a rough surface on the lens 102, so that the rough surface may be formed only on the inner peripheral surface of the lens barrel 101.

この構成により、レンズ１０２の筒部１０２ｂ内周部にレンズ１０３を押圧挿入し、鏡筒１０１内周部にレンズ１０２を押圧挿入した時、それぞれの接触面が噛み付き状態となって、レンズ１０２、レンズ１０３を鏡筒１０１内に安定させ保持できる。 With this configuration, when the lens 103 is pressed and inserted into the inner peripheral portion of the cylindrical portion 102b of the lens 102 and the lens 102 is pressed and inserted into the inner peripheral portion of the lens barrel 101, the respective contact surfaces are in a state of being bitten and the lens 102, The lens 103 can be stabilized and held in the lens barrel 101.

本発明にかかるレンズユニットは、接着剤を用いることなくレンズの位置精度を高めたレンズユニットを提供できるという効果を有し、レンズユニットの小型化とレンズの高度な位置精度が求められるコンパクトデジタルカメラやモバイルカメラ等に有用である。 The lens unit according to the present invention is advantageous in that it can provide a lens unit with improved lens position accuracy without using an adhesive, and is a compact digital camera that requires a smaller lens unit and higher lens position accuracy. It is useful for mobile cameras.

本発明のレンズユニットの一実施の形態を示す斜視図The perspective view which shows one Embodiment of the lens unit of this invention 図１のＩ−Ｉ線断面図Sectional view taken along the line II of FIG. 従来のレンズユニットの断面図Sectional view of a conventional lens unit

Explanation of symbols

１０１鏡筒
１０１ａ開口部
１０１ｂ開口部
１０１ｃ内周部
１０２レンズ
１０２ａレンズ部
１０２ｂ筒部
１０２ｃフランジ部
１０３レンズ 101 Lens barrel 101a Opening portion 101b Opening portion 101c Inner peripheral portion 102 Lens 102a Lens portion 102b Tube portion 102c Flange portion 103 Lens

Claims

A lens barrel, a first lens provided in the lens barrel, having a flange portion and a cylinder portion, and a second lens; and pressing and inserting the second lens into the first lens barrel portion; A lens unit, wherein the flange portion of the first lens and the inner peripheral portion of the lens barrel are tapered.

The lens unit according to claim 1, wherein the hardness of the second lens is higher than the hardness of the first lens.

The inner peripheral portion of the lens barrel and the flange portion of the first lens are tapered so as to expand from the first opening of the lens barrel toward the second opening. 2. The lens unit according to claim 1, wherein the flange portion of one lens is elastically held.

The inner periphery of the lens barrel has a shape that elastically expands, and the taper angle of the inner periphery of the lens barrel is the same as or smaller than the taper angle of the outer periphery of the first lens. The lens unit according to claim 3.

5. The lens according to claim 4, wherein at least one of an inner peripheral portion of the lens barrel, an outer peripheral portion of the flange portion of the first lens, and an inner peripheral portion of the cylindrical portion of the first lens is a rough surface. unit.