JP2003262778A - Photographing equipment - Google Patents
Photographing equipmentInfo
- Publication number
- JP2003262778A JP2003262778A JP2002061821A JP2002061821A JP2003262778A JP 2003262778 A JP2003262778 A JP 2003262778A JP 2002061821 A JP2002061821 A JP 2002061821A JP 2002061821 A JP2002061821 A JP 2002061821A JP 2003262778 A JP2003262778 A JP 2003262778A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- contact portion
- pressure contact
- lens barrel
- elastic member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Lens Barrels (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プラスチックレン
ズを有する安価な撮影レンズを用いても、周囲温度の影
響を受け難く、結像位置の変化が少ない撮影機器に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing device which is less affected by ambient temperature even when an inexpensive photographing lens having a plastic lens is used and whose image forming position does not change.
【０００２】[0002]
【従来の技術】近年、低価格のカメラに用いられる撮影
レンズは、ガラスレンズとプラスチックレンズの組合せ
か、または全てプラスチックレンズになっている。ま
た、低価格のカメラはオートフォーカス機構等の焦点調
節機構を備えておらず、ピント位置を過焦点距離に設定
した固定焦点方式になっているものが多い。2. Description of the Related Art In recent years, a photographing lens used for a low-priced camera has been a combination of a glass lens and a plastic lens, or a plastic lens. In addition, many low-priced cameras do not have a focus adjustment mechanism such as an autofocus mechanism, and often have a fixed focus method in which a focus position is set to a hyperfocal distance.
【０００３】プラスチックはガラスと比較して周囲温度
の影響を受けやすい。そして、正の屈折力のプラスチッ
クレンズを有する撮影レンズを搭載したカメラの周囲温
度が上昇すると、撮影レンズの温度も上昇するが、特に
プラスチックレンズは温度変化により材料の屈折率が変
化して、焦点距離が大きく延長する。これにより、撮影
レンズ全体の焦点距離が常温のときより延長し、バック
フォーカスも延長する。従って、被写体の光像が撮像素
子の結像面より後方に結像して、結像性能が低下してし
まう。Plastic is more susceptible to ambient temperature than glass. When the ambient temperature of a camera equipped with a photographic lens having a positive refractive power plastic lens rises, the temperature of the photographic lens also rises. The distance is greatly extended. As a result, the focal length of the entire taking lens becomes longer than that at room temperature, and the back focus also extends. Therefore, the optical image of the subject is formed behind the image forming surface of the image sensor, and the image forming performance is deteriorated.
【０００４】また、低価格のカメラではオートフォーカ
ス機構を有していないので、温度変化を電気的に換算・
処理して焦点位置を補正するようなことはできず、格別
の対策を取ったカメラはなかった。Further, since a low-priced camera does not have an autofocus mechanism, temperature changes can be converted electrically.
It was not possible to process and correct the focus position, and no camera took any special measures.
【０００５】一方、光学装置（コリメータ）において、
レンズを保持し温度変化によって筒長が変化する鏡筒を
設け、レンズを、温度変化によって生ずるレンズの焦点
位置の変化と鏡筒の長さの変化とを相殺してレンズの焦
点位置を一定位置に保持し得る素材で形成した技術が特
開平６−１３０２６７号公報に開示されている。On the other hand, in the optical device (collimator),
A lens barrel that holds the lens and whose barrel length changes according to temperature changes is provided, and the lens focus position is fixed by canceling the changes in the lens focal position and the lens barrel length caused by temperature changes. Japanese Unexamined Patent Publication (Kokai) No. 6-130267 discloses a technique formed of a material that can be retained in the above.
【０００６】[0006]
【発明が解決しようとする課題】本発明者達は上述のプ
ラスチックレンズによる焦点位置（以下、バックフォー
カスｆｂとも称す。）の変化を補正するために、特開平
６−１３０２６７号公報の技術を発展させ、カメラの撮
影レンズの焦点位置を一定位置に保持するように、撮影
レンズの焦点位置の変化と相殺して長さが変化するレン
ズ鏡枠を想起した。DISCLOSURE OF THE INVENTION The present inventors have developed the technique disclosed in Japanese Patent Laid-Open No. 6-130267 in order to correct the change in the focal position (hereinafter also referred to as back focus fb) due to the plastic lens described above. Then, in order to keep the focal position of the photographing lens of the camera at a fixed position, the lens barrel whose length is changed by canceling the change of the focal position of the photographing lens is recalled.
【０００７】一方、プラスチックレンズによるバックフ
ォーカスｆｂの変化量はかなり大きく、発明者達の実験
によれば、温度変化が２０℃であったとき、バックフォ
ーカスｆｂの変化量は約０．０５ｍｍであった。このプ
ラスチックレンズを保持するレンズ鏡枠を例えば線膨張
係数の大きいＡＢＳ樹脂で形成すると、その線膨張係数
は１０．０×１０-5であるので、温度変化が２０℃のと
きにはレンズ鏡枠の長さが２５ｍｍ必要になる。従っ
て、線膨張係数が５．０×１０-5の材料を用いれば、レ
ンズ鏡枠の長さが５０ｍｍ必要になる。On the other hand, the amount of change in the back focus fb due to the plastic lens is considerably large, and according to the experiments conducted by the inventors, the amount of change in the back focus fb is about 0.05 mm when the temperature change is 20 ° C. It was If the lens barrel holding this plastic lens is made of, for example, ABS resin having a large linear expansion coefficient, the linear expansion coefficient is 10.0 × 10 −5 . Therefore, when the temperature change is 20 ° C., the length of the lens barrel is long. 25 mm is required. Therefore, if a material having a linear expansion coefficient of 5.0 × 10 −5 is used, the length of the lens frame needs to be 50 mm.
【０００８】しかし、レンズ鏡枠の長さを２５ｍｍとし
ても、現在市販されているような厚みの薄い小型カメラ
を実現することは困難であり、カメラの大型化を招いて
しまう。However, even if the length of the lens frame is set to 25 mm, it is difficult to realize a thin camera having a small thickness, which is commercially available at the present time, and the size of the camera is increased.
【０００９】従って、より熱膨張係数が大きく、且つレ
ンズ鏡枠に用いることができる強度、成型性等の各種特
性を満足できる材料を選択することが必要となり、材料
選択が非常に制限されると共に、実現できたとしても原
価高になる。Therefore, it is necessary to select a material having a larger coefficient of thermal expansion and satisfying various characteristics such as strength and moldability that can be used for the lens barrel, and the material selection is extremely limited. Even if it could be realized, the cost would be high.
【００１０】本発明はかかる問題に鑑みてなされたもの
であり、温度変化による撮影レンズの焦点位置の変化
を、選択に自由度がある材料を用いて機械的に相殺して
補正することができる撮影機器を提案することを発明の
目的とする。The present invention has been made in view of such a problem, and can correct the change in the focal position of the photographing lens due to the temperature change by mechanically offsetting it by using a material having a degree of freedom in selection. It is an object of the invention to propose a photographing device.
【００１１】[0011]
【課題を解決するための手段】上記目的は下記の手段に
より達成される。The above object can be achieved by the following means.
【００１２】少なくとも１枚のプラスチックレンズを有
する撮影レンズを備えた撮影機器において、少なくとも
１枚のプラスチックレンズを保持し、線膨張係数の小な
る材質によって構成されたレンズ鏡枠と、円筒状に形成
されて前記レンズ鏡枠の外周側の位置に配置され、線膨
張係数の大なる材質によって構成された伸縮部材と、弾
性を有して前記レンズ鏡枠を被写体側に押圧する弾性部
材と、を備え、前記弾性部材の押圧によって前記レンズ
鏡枠に設けた第１圧接部が前記伸縮部材に設けた第２圧
接部に圧接し、前記第１圧接部若しくは前記第２圧接部
の少なくとも何れか一方が、被写体側の中心位置から結
像面側の外周方向にかけたテーパー面に形成されている
ことを特徴とする撮影機器。In a photographing device having a photographing lens having at least one plastic lens, at least one plastic lens is held, and a lens barrel made of a material having a small linear expansion coefficient is formed into a cylindrical shape. And an elastic member which is arranged at a position on the outer peripheral side of the lens barrel and is made of a material having a large linear expansion coefficient, and an elastic member which has elasticity and presses the lens barrel toward the subject side. A first pressure contact portion provided on the lens barrel by pressure of the elastic member is in pressure contact with a second pressure contact portion provided on the elastic member, and at least one of the first pressure contact portion and the second pressure contact portion is provided. Is formed on a taper surface extending from the center position on the subject side to the outer peripheral direction on the image plane side.
【００１３】[0013]
【発明の実施の形態】本発明の撮影機器に関する実施の
形態を図を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an image pickup apparatus of the present invention will be described with reference to the drawings.
【００１４】先ず、図１を参照して説明するが、図１は
撮影機器に用いるレンズ鏡胴の縦断面図である。First, referring to FIG. 1, FIG. 1 is a vertical sectional view of a lens barrel used in a photographing device.
【００１５】図１において、凸レンズからなる第１レン
ズＬ１１、凹レンズからなる第２レンズＬ１２、及び凸
レンズからなる第３レンズＬ１３から撮影レンズ１が構
成され、被写体の光像はこれらのレンズによってＣＣＤ
等からなる撮像素子２に結像する。そして、第１レンズ
Ｌ１１若しくは第３レンズＬ１３の少なくとも何れか１
枚はプラスチックレンズである。In FIG. 1, a taking lens 1 is composed of a first lens L11 consisting of a convex lens, a second lens L12 consisting of a concave lens, and a third lens L13 consisting of a convex lens.
An image is formed on the image sensor 2 including Then, at least one of the first lens L11 and the third lens L13
Sheets are plastic lenses.
【００１６】なお、撮像素子２はプリント配線基板３に
実装されている。第１レンズＬ１１、第２レンズＬ１２
及び第３レンズＬ１３はレンズ鏡枠４に保持されてい
る。レンズ鏡枠４は、被写体側の中心位置から撮像素子
２による結像面側の外周方向にかけてテーパー面を形成
した第１圧接部４ａを先端に有している。The image pickup device 2 is mounted on the printed wiring board 3. First lens L11, second lens L12
The third lens L13 is held by the lens barrel 4. The lens barrel 4 has at its tip a first pressure contact portion 4a having a tapered surface extending from the center position on the subject side to the outer peripheral direction on the image forming surface side of the image sensor 2.
【００１７】レンズ鏡枠４の外周側の位置には円筒状に
形成された伸縮部材５が配置され、伸縮部材５は第１圧
接部４ａのテーパー面と略同一の傾斜角度のテーパー面
を形成した第２圧接部５ａを先端に有していて、後端部
５ｂにてプリント配線基板３に固定されている。A cylindrical expansion / contraction member 5 is arranged at a position on the outer peripheral side of the lens barrel 4, and the expansion / contraction member 5 forms a taper surface having an inclination angle substantially the same as the taper surface of the first press contact portion 4a. The second pressure contact portion 5a is provided at the front end and is fixed to the printed wiring board 3 at the rear end portion 5b.
【００１８】レンズ鏡枠４の後端部４ｂとプリント配線
基板３との間にはレンズ鏡枠４を被写体側に向けて付勢
するゴムリング６（弾性部材）が配置されていて、ゴム
リング６の弾性力によってレンズ鏡枠４を被写体側に押
圧している。従って、レンズ鏡枠４の第１圧接部４ａが
伸縮部材５の第２圧接部５ａに常に圧接している。Between the rear end 4b of the lens barrel 4 and the printed wiring board 3, a rubber ring 6 (elastic member) for urging the lens barrel 4 toward the subject side is arranged. The lens barrel 4 is pressed toward the subject by the elastic force of 6. Therefore, the first pressure contact portion 4a of the lens barrel 4 is always in pressure contact with the second pressure contact portion 5a of the expandable member 5.
【００１９】ここで、撮影レンズ１のバックフォーカス
ｆｂは、例えば温度が上昇すると延長する。即ち、被写
体光が撮像素子２の結像面より後方に結像し、結像性能
が低下してしまう。この問題を解消するためには、バッ
クフォーカスｆｂが延長した分だけ、撮影レンズ１を前
方に移動させてやればよい。Here, the back focus fb of the taking lens 1 extends, for example, when the temperature rises. That is, the subject light forms an image behind the image forming surface of the image pickup element 2, and the image forming performance deteriorates. In order to solve this problem, the photographing lens 1 may be moved forward by an amount corresponding to the extension of the back focus fb.
【００２０】そこで、レンズ鏡枠４を線膨張係数の小さ
い材料で構成し、伸縮部材５を線膨張係数の大きい材料
によって構成すれば、温度上昇によって伸縮部材５はレ
ンズ鏡枠４より大きく伸長する。この結果、伸縮部材５
の軸方向の伸長によって第２圧接部５ａは被写体方向に
移動すると共に、伸縮部材５の径方向の伸長によって第
２圧接部５ａは外周方向にも移動する。Therefore, if the lens barrel 4 is made of a material having a small linear expansion coefficient and the expanding / contracting member 5 is made of a material having a large linear expansion coefficient, the expanding / contracting member 5 expands more than the lens barrel 4 due to temperature rise. . As a result, the elastic member 5
The second pressure contact portion 5a moves in the direction of the subject due to the expansion of the axial direction, and the second pressure contact portion 5a also moves in the outer peripheral direction due to the expansion of the elastic member 5 in the radial direction.
【００２１】この第２圧接部５ａの移動を図２に示す拡
大図により説明する。図２において、「イ」が第２圧接
部５ａの常温（例えば２０°）の位置とし、「ロ」が第
２圧接部５ａが温度上昇によって伸長した位置とする。
温度上昇によって伸縮部材５が軸方向に伸長し、第２圧
接部５ａの点Ｐ１は被写体方向にΔＬ５移動する。同時
に、伸縮部材５が径方向にも伸長し、第２圧接部５ａの
点Ｐ１は外周方向にΔＤ５移動する。第２圧接部５ａに
おける中心軸と直交する方向に対する傾斜角度をθとす
ると、常温でのＰ１点と光軸方向について同軸上にある
Ｐ２点との距離、即ち第２圧接部５ａの被写体方向への
移動量ΔＴ５は、下式の如くなる。The movement of the second pressure contact portion 5a will be described with reference to the enlarged view shown in FIG. In FIG. 2, “A” is the position of the second pressure contact portion 5a at room temperature (for example, 20 °), and “B” is the position where the second pressure contact portion 5a is extended by the temperature rise.
The elastic member 5 expands in the axial direction due to the temperature rise, and the point P1 of the second pressure contact portion 5a moves by ΔL5 toward the subject. At the same time, the elastic member 5 also extends in the radial direction, and the point P1 of the second pressure contact portion 5a moves by ΔD5 in the outer peripheral direction. When the inclination angle of the second pressure contact portion 5a with respect to the direction orthogonal to the central axis is θ, the distance between the point P1 at room temperature and the point P2 coaxial with the optical axis direction, that is, toward the subject of the second pressure contact portion 5a. The movement amount ΔT5 of is expressed by the following equation.
【００２２】ΔＴ５＝ΔＬ５＋ΔＤ５・ｔａｎθ
なお、ゴムリング６によって被写体側に付勢されている
第１圧接部４ａが第２圧接部５ａに圧接しているレンズ
鏡枠４は、その線膨張係数は伸縮部材５に比べて小さい
が、同様に温度上昇によって径方向に伸長して第１圧接
部４ａが外周方向にΔＤ４移動するとし、第１圧接部４
ａの傾斜角度を同一のθとすると、その移動量ΔＴは下
記の式になる。[Delta] T5 = [Delta] L5 + [Delta] D5.tan [theta] The lens barrel 4 in which the first pressure contact portion 4a biased to the subject side by the rubber ring 6 is in pressure contact with the second pressure contact portion 5a has a coefficient of linear expansion and contraction. Although it is smaller than the member 5, it is assumed that the first pressure contact portion 4a similarly expands in the radial direction due to the temperature rise and the first pressure contact portion 4a moves by ΔD4 in the outer peripheral direction.
When the inclination angle of a is the same θ, the movement amount ΔT is given by the following formula.
【００２３】
ΔＴ＝ΔＬ５＋（ΔＤ５−ΔＤ４）ｔａｎθ
従って、温度上昇に伴って、撮影レンズ１も光軸に沿っ
て被写体方向に移動するので、撮影レンズ１のバックフ
ォーカスｆｂの延長量を相殺するように上記の移動量Δ
Ｔを設定すれば、温度変化による撮影レンズ１の焦点位
置の変化を補正することができる。即ち、撮影レンズ１
のバックフォーカスｆｂの延長量を相殺するように、レ
ンズ鏡枠４及び伸縮部材５の長さ、径、線膨張係数、並
びに第１圧接部４ａ及び第２圧接部５ａの傾斜角度θを
設定すればよい。ΔT = ΔL5 + (ΔD5-ΔD4) tan θ Therefore, as the temperature rises, the taking lens 1 also moves toward the subject along the optical axis, so that the extension amount of the back focus fb of the taking lens 1 is offset. To the above movement amount Δ
By setting T, it is possible to correct the change in the focal position of the taking lens 1 due to the temperature change. That is, the taking lens 1
The length, diameter, linear expansion coefficient of the lens barrel 4 and the elastic member 5, and the inclination angle θ of the first press contact portion 4a and the second press contact portion 5a may be set so as to cancel out the extension amount of the back focus fb. Good.
【００２４】なお、伸縮部材５は温度変化によって伸縮
し易いプラスチックより形成されることが望ましく、そ
の線膨張係数は１０×１０-5程度が望ましいが、レンズ
鏡枠４は温度変化によって伸縮し難い金属若しくはグラ
ス入りプラスチックより形成されることが望ましく、そ
の線膨張係数は１×１０-5程度が望ましい。The elastic member 5 is preferably made of plastic that easily expands and contracts due to temperature changes, and its linear expansion coefficient is preferably about 10 × 10 -5, but the lens barrel 4 is difficult to expand and contract due to temperature changes. It is preferably formed of metal or plastic containing glass, and its linear expansion coefficient is preferably about 1 × 10 −5 .
【００２５】また、温度下降の際には伸縮部材５が短縮
するので、ゴムリング６の弾性力に抗して第２圧接部５
ａが第１圧接部４ａを押圧して、レンズ鏡枠４を結像面
側に移動させることになる。従って、傾斜角度θがあま
り大きいと、第２圧接部５ａが第１圧接部４ａを押圧す
るのが困難になり、傾斜角度θがあまり小さいと、伸縮
部材５の径方向の伸長が光軸方向への伸長に寄与する割
合が小さくなる。Further, since the elastic member 5 is shortened when the temperature is lowered, the second pressure contact portion 5 is resisted against the elastic force of the rubber ring 6.
a presses the first pressure contact portion 4a, and moves the lens barrel 4 to the image plane side. Therefore, if the inclination angle θ is too large, it becomes difficult for the second pressure contact portion 5a to press the first pressure contact portion 4a, and if the inclination angle θ is too small, the expansion and contraction of the elastic member 5 in the optical axis direction occurs. The ratio that contributes to the elongation is reduced.
【００２６】従って、光軸と直交する方向に対する傾斜
角度θは、３０°以上６０°以下であることが望まし
い。Therefore, the inclination angle θ with respect to the direction orthogonal to the optical axis is preferably 30 ° or more and 60 ° or less.
【００２７】このように、レンズ鏡枠４をゴムリング６
によって被写体側に押圧し、温度変化によって伸縮する
伸縮部材５に追随させることによって、撮影レンズ１の
焦点位置の変化を補正しているが、テーパー面を有する
第１圧接部４ａをテーパー面を有する第２圧接部５ａに
追随させているので、伸縮部材５の光軸方向の伸縮に加
えて径方向の伸縮も寄与し、伸縮部材５の光軸方向の長
さを「発明が解決しようとする課題」で述べたように格
別に長くする必要がなく、レンズ鏡胴の小型化を阻害す
ることがない。In this way, the lens barrel 4 is attached to the rubber ring 6
Although the change in the focal position of the taking lens 1 is corrected by pressing the subject side toward the subject and following the expandable member 5 that expands and contracts due to the temperature change, the first press contact portion 4a having the tapered surface has the tapered surface. Since the second press contact portion 5a is made to follow, the expansion / contraction of the elastic member 5 in the optical axis direction as well as the expansion / contraction in the radial direction contributes, and the length of the elastic member 5 in the optical axis direction is "the invention is going to solve. As described in “Problem”, there is no need to make the length particularly long, and the miniaturization of the lens barrel is not hindered.
【００２８】また、ゴムリングに代えてプラスチック等
から形成されて弾性を有するリングでもよいし、つる巻
きバネや板バネであってもよい。要はレンズ鏡枠４を被
写体側に押圧できれば、どのような弾性部材であっても
よい。Further, instead of the rubber ring, an elastic ring made of plastic or the like may be used, or a spiral spring or a leaf spring may be used. In short, any elastic member may be used as long as it can press the lens barrel 4 toward the subject.
【００２９】なお、以上の如く説明した実施の形態は、
レンズ鏡枠４の第１圧接部４ａと伸縮部材５の第２圧接
部５ａの双方をテーパー面に形成したが、必ずしも双方
がテーパー面である必要はなく、第１圧接部４ａ若しく
は第２圧接部５ａの何れか一方がテーパー面であればよ
い。これを図３及び図４を参照して説明する。The embodiment described above is
Although both the first pressure contact portion 4a of the lens barrel 4 and the second pressure contact portion 5a of the expansion / contraction member 5 are formed as tapered surfaces, it is not necessary that both are tapered surfaces, and the first pressure contact portion 4a or the second pressure contact portion 4a is not necessarily required. Any one of the parts 5a may be a tapered surface. This will be described with reference to FIGS. 3 and 4.
【００３０】図３は伸縮部材の第２圧接部のみをテーパ
ー面とし、レンズ鏡枠の第１圧接部を突状にした拡大図
である。図３において、常温のときにレンズ鏡枠１４の
第１圧接部１４ａが伸縮部材１５の第２圧接部１５ａに
圧接しているとし、この位置を各々「イ」とする。次
に、高温になると第２圧接部１５ａは中心軸と平行な方
向と直交する方向との双方に伸長して「ロ」の位置に移
動するので、第２圧接部１５ａの移動に伴ってゴムリン
グ６によって押圧されたレンズ鏡枠１４の第１圧接部１
４ａも「ロ」の位置に移動する。従って、第２圧接部１
５ａが中心軸と平行な方向にしか伸長しないと仮定した
「ハ」の位置よりも第１圧接部１４ａは中心軸と平行な
方向により大きく移動することができる。FIG. 3 is an enlarged view in which only the second pressure-contacting portion of the expansion / contraction member has a tapered surface, and the first pressure-contacting portion of the lens barrel is projected. In FIG. 3, it is assumed that the first pressure contact portion 14a of the lens barrel 14 is in pressure contact with the second pressure contact portion 15a of the expansion / contraction member 15 at room temperature, and these positions are designated as "a". Next, when the temperature rises, the second pressure contact portion 15a expands in both the direction parallel to the central axis and the direction orthogonal to the center axis and moves to the position "b". Therefore, the rubber moves along with the movement of the second pressure contact portion 15a. The first pressure contact portion 1 of the lens barrel 14 pressed by the ring 6.
4a also moves to the position of "b". Therefore, the second pressure contact portion 1
The first press contact portion 14a can move more in the direction parallel to the central axis than at the position of "c" where it is assumed that 5a extends only in the direction parallel to the central axis.
【００３１】図４はレンズ鏡枠の第１圧接部のみをテー
パー面とし、伸縮部材の第２圧接部を突状にした拡大図
である。図４において、常温のときにレンズ鏡枠２４の
第１圧接部２４ａが伸縮部材２５の第２圧接部２５ａに
圧接しているとし、この位置を各々「イ」とする。次
に、高温になると第２圧接部２５ａは中心軸と平行な方
向と直交する方向との双方に伸長して「ロ」の位置に移
動するので、第２圧接部２５ａの移動に伴ってゴムリン
グ６によって押圧されたレンズ鏡枠２４の第１圧接部２
４ａも「ロ」の位置に移動する。従って、第２圧接部２
５ａが中心軸と平行な方向にしか伸長しないと仮定した
「ハ」の位置よりも第１圧接部２４ａは中心軸と平行な
方向により大きく移動することができる。FIG. 4 is an enlarged view in which only the first pressure contact portion of the lens barrel has a tapered surface and the second pressure contact portion of the expansion / contraction member has a projecting shape. In FIG. 4, it is assumed that the first pressure contact portion 24a of the lens barrel 24 is in pressure contact with the second pressure contact portion 25a of the expansion / contraction member 25 at room temperature, and these positions are designated as "a". Next, when the temperature becomes high, the second pressure contact portion 25a expands in both the direction parallel to the central axis and the direction orthogonal to the center axis and moves to the position of "b". Therefore, the rubber moves as the second pressure contact portion 25a moves. The first pressure contact portion 2 of the lens frame 24 pressed by the ring 6.
4a also moves to the position of "b". Therefore, the second pressure contact portion 2
The first press contact portion 24a can move more in the direction parallel to the central axis than the position of "C" where it is assumed that 5a extends only in the direction parallel to the central axis.
【００３２】また、以上の実施の形態は３群３枚構成の
撮影レンズであるが、２群構成でも４群以上の構成の撮
影レンズにも適用できる。Further, although the above-mentioned embodiment is a taking lens having a three-group, three-lens configuration, the present invention can be applied to a taking lens having a two-group configuration or four or more groups.
【００３３】その他に、撮影レンズ１はピント調整を行
わない固定焦点方式であって、生産時に常温にて撮像素
子２とプリント配線基板３との距離を変えたり、レンズ
鏡枠４とプリント配線基板３の距離を変えたりして、過
焦点距離に合焦するようにピント調整を行う。In addition, the photographing lens 1 is a fixed focus type without focus adjustment, and the distance between the image pickup device 2 and the printed wiring board 3 is changed at room temperature during production, or the lens barrel 4 and the printed wiring board are changed. By changing the distance of 3, focus adjustment is performed so as to focus on the hyperfocal distance.
【００３４】[0034]
【発明の効果】本発明の撮影機器によれば、温度変化に
よる撮影レンズの焦点位置の変化を、選択に自由度があ
る材料を用いて機械的に相殺して補正することができ、
且つ小型化を阻害することがない。According to the photographing apparatus of the present invention, the change in the focal position of the photographing lens due to the temperature change can be mechanically offset and corrected by using a material having a degree of freedom in selection,
Moreover, it does not hinder the miniaturization.
【図１】撮影機器に用いるレンズ鏡胴の縦断面図であ
る。FIG. 1 is a vertical cross-sectional view of a lens barrel used in a photographing device.
【図２】第２圧接部の移動を説明する拡大図である。FIG. 2 is an enlarged view for explaining movement of a second pressure contact portion.
【図３】伸縮部材の第２圧接部のみをテーパー面とし、
レンズ鏡枠の第１圧接部を突状にした拡大図である。FIG. 3 shows only the second pressure contact portion of the elastic member with a tapered surface,
It is an enlarged view which made the 1st press contact part of a lens barrel the shape of a protrusion.
【図４】レンズ鏡枠の第１圧接部のみをテーパー面と
し、伸縮部材の第２圧接部を突状にした拡大図である。FIG. 4 is an enlarged view in which only the first pressure-contacting portion of the lens barrel has a tapered surface and the second pressure-contacting portion of the expansion / contraction member has a projecting shape.
１ 撮影レンズ ２ 撮像素子 ３ プリント配線基板 ４，１４，２４ レンズ鏡枠 ４ａ，１４ａ，２４ａ 第１圧接部 ５，１５，２５ 伸縮部材 ５ａ，１５ａ，２５ａ 第２圧接部 1 Shooting lens 2 image sensor 3 printed wiring board 4,14,24 Lens frame 4a, 14a, 24a 1st pressure contact part 5,15,25 Telescopic member 5a, 15a, 25a 2nd pressure contact part
Claims (3)
有する撮影レンズを備えた撮影機器において、少なくと
も１枚のプラスチックレンズを保持し、線膨張係数の小
なる材質によって構成されたレンズ鏡枠と、円筒状に形
成されて前記レンズ鏡枠の外周側の位置に配置され、線
膨張係数の大なる材質によって構成された伸縮部材と、
弾性を有して前記レンズ鏡枠を被写体側に押圧する弾性
部材と、を備え、前記弾性部材の押圧によって前記レン
ズ鏡枠に設けた第１圧接部が前記伸縮部材に設けた第２
圧接部に圧接し、前記第１圧接部若しくは前記第２圧接
部の少なくとも何れか一方が、被写体側の中心位置から
結像面側の外周方向にかけたテーパー面に形成されてい
ることを特徴とする撮影機器。1. A photographic device equipped with a photographic lens having at least one plastic lens, and a lens barrel which holds at least one plastic lens and is made of a material having a small linear expansion coefficient, and a cylindrical shape. And an elastic member formed at a position on the outer peripheral side of the lens barrel and formed of a material having a large linear expansion coefficient,
An elastic member that has elasticity and presses the lens barrel toward the subject side, and a first pressure contact portion provided on the lens barrel by pressing the elastic member is provided on the expandable member.
The pressure contact portion is pressure-contacted, and at least one of the first pressure-contact portion and the second pressure-contact portion is formed on a tapered surface extending from a center position on the subject side to an outer peripheral direction on the image plane side. Shooting equipment.
における中心軸と直交する方向に対する傾斜角度を３０
°以上６０°以下としたことを特徴とする請求項１に記
載の撮影機器。2. The inclination angle of the first pressure contact portion or the second pressure contact portion with respect to the direction orthogonal to the central axis is 30.
The photographing device according to claim 1, wherein the photographing device has an angle of not less than 60 ° and not more than 60 °.
とを特徴とする請求項１又は請求項２に記載の撮影機
器。3. The photographing apparatus according to claim 1, wherein the photographing lens is of a fixed focus type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002061821A JP2003262778A (en) | 2002-03-07 | 2002-03-07 | Photographing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002061821A JP2003262778A (en) | 2002-03-07 | 2002-03-07 | Photographing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003262778A true JP2003262778A (en) | 2003-09-19 |
Family
ID=29195912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002061821A Pending JP2003262778A (en) | 2002-03-07 | 2002-03-07 | Photographing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003262778A (en) |
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| JP2005189261A (en) * | 2003-12-24 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Lens unit and electronic equipment using the same |
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