JPH02201302A - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JPH02201302A JPH02201302A JP2192489A JP2192489A JPH02201302A JP H02201302 A JPH02201302 A JP H02201302A JP 2192489 A JP2192489 A JP 2192489A JP 2192489 A JP2192489 A JP 2192489A JP H02201302 A JPH02201302 A JP H02201302A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- fixing member
- plastic
- frame
- fixation 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
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- 239000004945 silicone rubber Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 abstract description 30
- 238000007906 compression Methods 0.000 abstract description 30
- 239000004033 plastic Substances 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 9
- 229920001971 elastomer Polymers 0.000 abstract description 4
- 125000006850 spacer group Chemical group 0.000 abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000005060 rubber Substances 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
Landscapes
- Lens Barrels (AREA)
Abstract
Description
【発明の詳細な説明】
皮呈上皇机几立野
本発明はレンズ鏡胴に関するものであり、特に玉枠との
膨張係数が大きく異なるプラスチックレンズ等のレンズ
を玉枠に固定するレンズ固定部材が設けられたレンズ鏡
胴に関するものである。[Detailed Description of the Invention] The present invention relates to a lens barrel, and in particular, a lens fixing member is provided for fixing a lens such as a plastic lens whose expansion coefficient is significantly different from that of a lens frame to a lens frame. The present invention relates to a lens barrel that has been developed.
従来公肢血
従来より、プラスチックレンズをレンズ鏡胴に固定する
方法としては、レンズ鏡胴の玉枠に接着剤等でプラスチ
ックレンズを接着して固定する方法．板バネやコイルバ
ネ等の圧縮バネでプラスチックレンズの周縁部を玉枠に
押し付けて固定する゜方法等が知られている。Traditionally, the method of fixing a plastic lens to a lens barrel is to glue the plastic lens to the lens frame of the lens barrel using adhesive. A known method is to use a compression spring such as a leaf spring or a coil spring to press and fix the peripheral edge of a plastic lens against a lens frame.
しかしながら、前者の方法によればプラスチックレンズ
の膨張係数と玉枠の膨張係数とが大きく異なるため、温
度変化によるプラスチックレンズの膨張又は収縮が玉枠
によって制限される。例えば、アクリル樹脂製のプラス
チックレンズの温度変化による変化量は６ ＸＩＯ−’
ｎｎ＋／”Ｃであり、ポリカーボネー｝（ＣＦ２０％）
製の玉枠の温度変化による変化量は２．５ Ｘ １０−
’ｍｍ／ ”Ｃである．従って、温度変化に伴うプラス
チックレンズ及び玉枠の寸法の変化によってプラスチッ
クレンズが変形し、レンズの光学性能が低下するという
問題がある。However, according to the former method, the expansion coefficient of the plastic lens and the expansion coefficient of the lens frame are significantly different, so that the expansion or contraction of the plastic lens due to temperature changes is limited by the lens frame. For example, the amount of change due to temperature change for a plastic lens made of acrylic resin is 6 XIO-'
nn+/”C, polycarbonate} (CF20%)
The amount of change due to temperature change in the ball frame is 2.5 x 10-
'mm/'C.Therefore, there is a problem in that the plastic lens is deformed due to changes in the dimensions of the plastic lens and lens frame due to temperature changes, and the optical performance of the lens is degraded.
また、後者の方法によればバネがプラスチックレンズに
接する部分のみが変形し、レンズの光学性能が低下する
という問題がある。Furthermore, according to the latter method, only the portion where the spring contacts the plastic lens is deformed, resulting in a problem that the optical performance of the lens is degraded.
そこで、これらの問題が生じないレンズ保持装置として
、レンズと押え環等との間に０リング等の弾性部材をレ
ンズ固定部材として介在させ、押え環等をねじ込むこと
によってレンズを押圧固定する装置（特開昭６１−１４
９９１１号公報等参照）等が提案されている。Therefore, as a lens holding device that does not cause these problems, an elastic member such as an O-ring is interposed as a lens fixing member between the lens and a presser ring, etc., and a device that presses and fixes the lens by screwing the presser ring etc. Unexamined Japanese Patent Publication 1986-14
9911, etc.) have been proposed.
が しようとする
しかしながら、この装置においては弾性部材として、０
リングのような断面が円形のものや断面が略コの字状の
リングが用いられているため、押え環等の玉押えを玉枠
にねじ込むときの玉押えの取り付は誤差、複数のレンズ
間の間隔誤差、複数のレンズ間に取り付けられる間隔部
品の厚さの誤差等によってレンズに対する弾性部材の圧
縮シロが変化すると、この圧縮シロに対する弾性部材の
圧縮力が太き（変化する０例えば第２図（Ｂ）に示され
ているような厚さ（―）を有し、断面が円形の弾性部材
を矢印（Ｃ）方向に圧縮した場合、圧縮シロ（ａ）が増
大すると圧縮面積（ｂ）は第４図に示すように著しく増
大する０弾性部材の圧縮力は、圧縮面積（ｂ）にほぼ比
例するので、圧縮シロ（ａ）のわずかな変化に対しても
弾性部材の圧縮力は大きく変化し、前記誤差によってレ
ンズに加わる圧縮力が所望の圧力よりも大きくなりすぎ
たり小さくなりすぎたりして、安定した圧力でレンズを
レンズ鏡胴に固定することができないという問題がある
。従って、圧縮力が大きすぎた場合、レンズに歪が生じ
たり、レンズが変形したりすることによってレンズの光
学性能が低下し、また圧縮力が小さすぎた場合、レンズ
鏡胴に対するレンズの正確な位置決めを行うことができ
なかったり、衝撃等によってレンズが所定の位置から外
れたりすることによって、レンズの光学性能が低下して
しまう。However, in this device, as an elastic member, 0
Rings with a circular cross section or rings with a substantially U-shaped cross section are used, so when screwing the ball presser such as a presser ring into the ball frame, there may be errors in the installation of the ball presser, and multiple lenses may be attached. When the compression margin of the elastic member relative to the lens changes due to an error in the distance between the lenses, an error in the thickness of the spacing parts attached between multiple lenses, etc., the compression force of the elastic member against this compression margin increases (for example, When an elastic member having a thickness (-) and a circular cross section as shown in Figure 2 (B) is compressed in the direction of arrow (C), as the compression margin (a) increases, the compression area (b ) increases significantly as shown in Figure 4.0 The compressive force of the elastic member is approximately proportional to the compression area (b), so even if the compression height (a) changes slightly, the compressive force of the elastic member increases. There is a problem that the compressive force applied to the lens becomes too large or too small than the desired pressure due to the error, and the lens cannot be fixed to the lens barrel with a stable pressure. If the compressive force is too large, the optical performance of the lens will deteriorate due to distortion or deformation of the lens, and if the compressive force is too small, the accurate positioning of the lens with respect to the lens barrel will deteriorate. The optical performance of the lens deteriorates if the lens is not able to do so, or if the lens becomes dislodged from a predetermined position due to an impact or the like.
本発明は、上記の問題点を解決し、安定した圧力でレン
ズの固定を行うことができるレンズ鏡胴を提供すること
を目的とする。An object of the present invention is to solve the above-mentioned problems and provide a lens barrel that can fix a lens with stable pressure.
量 を”°するための
上記の目的を達成するため本発明では、押圧による圧縮
力によりレンズを玉枠に固定するレンズ固定部材が設け
られたレンズ鏡胴であって、該レンズ固定部材が前記レ
ンズの全周に均一に圧力を加えるリング状で、且つ断面
が略三角形状の弾性体としている。In order to achieve the above-mentioned object of reducing the amount of the lens, the present invention provides a lens barrel that is provided with a lens fixing member that fixes the lens to the lens frame by compressive force caused by pressing, the lens fixing member having the above-mentioned It is a ring-shaped elastic body with a substantially triangular cross section that applies pressure uniformly to the entire circumference of the lens.
さらに、前記レンズ固定部材をシリコンゴムで構成する
のが好ましい。Furthermore, it is preferable that the lens fixing member is made of silicone rubber.
作−■
このような構成によると、レンズに対するレンズ固定部
材の圧縮シロが変化しても、圧縮シロに対するレンズ固
定部材の圧縮力は大きく変化することがないので、レン
ズの光学性能を低下させることなく安定したレンズの固
定を行うことができる。With this configuration, even if the compression margin of the lens fixing member relative to the lens changes, the compression force of the lens fixing member relative to the compression margin does not change significantly, so the optical performance of the lens will not deteriorate. The lens can be stably fixed without any problems.
また、レンズ固定部材としてシリコンゴムから成るもの
を用いた場合、プラスチックレンズの材料を変質させる
ガスが発生しないのでレンズの光学性能の低下を防止す
ることができる。In addition, when a lens fixing member made of silicone rubber is used, no gas is generated that alters the quality of the material of the plastic lens, so that deterioration in the optical performance of the lens can be prevented.
亥ＪＬＩＬ 以下本発明の実施例について説明する。Pig JLIL Examples of the present invention will be described below.
第１図は本発明を実施したレンズ鏡胴の断面図であり、
玉枠（２）内に物体側から順にレンズ（Ｇｌ）。FIG. 1 is a sectional view of a lens barrel embodying the present invention.
Inside the lens frame (2), place the lens (Gl) in order from the object side.
（Ｇ２）、 （Ｇ３）及び（Ｇ４）が取り付けられてい
る。レンズ（Ｇ３）はプラスチックレンズであり、像側
のレンズ周縁部で玉枠（２）に嵌合される。そして、玉
押え（３）をネジ部（６）で玉枠（２）に締め付ける。(G2), (G3) and (G4) are attached. The lens (G3) is a plastic lens, and is fitted into the lens frame (2) at the peripheral edge of the lens on the image side. Then, the ball presser foot (3) is tightened to the ball frame (2) using the threaded portion (6).
ことによって、物体側からレンズ（Ｇｌ）、 レンズ
（Ｇ２） 。By this, lens (Gl), lens (G2) from the object side.
間隔部品（４）、レンズ固定部材（１）及び固定絞り（
５）を介して、レンズ（Ｇ３）は玉枠（２）に押し付は
固定される。尚、間隔部分（４）及び固定絞り（５）は
必ずしも必要でないのはもちろんであり、レンズ（Ｇ２
）がレンズ（Ｇ３）の近くにあれば、レンズ（Ｇ２）が
レンズ固定部材（１）を介してレンズ（Ｇ３）を玉枠（
２）に押し付けるようにしてもよい。Spacing part (4), lens fixing member (1) and fixed aperture (
5), the lens (G3) is pressed and fixed to the lens frame (2). Incidentally, it goes without saying that the interval portion (4) and the fixed aperture (5) are not necessarily necessary, and the lens (G2
) is near the lens (G3), the lens (G2) will attach the lens (G3) to the lens frame (
2) may be applied.
レンズ固定部材（１）は、固定絞り（５）を介してレン
ズ（Ｇ３）の全周に均一に圧力を加えるリング状となっ
ており、レンズ（Ｇ３）に加わる力には部分的な偏りが
ないので、レンズ（Ｇ３）の部分的な変形が生じない、
また、レンズ固定部材（１）はシリコンゴム、プラスチ
ックエラストマー、ゴム又はプラスチックの発泡体やそ
れらを含む複合材料等の材質から成る弾性体であるが、
これらに限られず弾性を有するものであればよい、尚、
レンズ固定部材（１）としてウレタン系の材料を用いた
場合、材料から発生するガスがプラスチックレンズの材
料を変質させ、レンズの光学性能を低下させることがあ
るので、このようなガスが発生しないシリコンゴム等の
材料から成るレンズ固定部材（１）を用いるのが好まし
い。The lens fixing member (1) has a ring shape that applies pressure uniformly to the entire circumference of the lens (G3) via the fixed aperture (5), and the force applied to the lens (G3) is partially biased. There is no partial deformation of the lens (G3).
Further, the lens fixing member (1) is an elastic body made of a material such as silicone rubber, plastic elastomer, rubber or plastic foam, or a composite material containing these materials.
It is not limited to these, but any material that has elasticity may be used.
When a urethane-based material is used as the lens fixing member (1), the gas generated from the material may alter the quality of the plastic lens material and reduce the optical performance of the lens. It is preferable to use a lens fixing member (1) made of a material such as rubber.
第１図に示すように、レンズ固定部材（１）は断面が三
角形状であり、固定絞り（５）に接する辺の対角の先端
で間隔部品（４）から力が加わるように構成されている
。逆に、間隔部品（４）に前記三角形状の一辺が接し、
その対角の先端で固定絞り（５）に力を加えるように構
成されていてもよい。As shown in Fig. 1, the lens fixing member (1) has a triangular cross section, and is configured so that force is applied from the spacer part (4) at the diagonal tip of the side that touches the fixed aperture (5). There is. On the contrary, one side of the triangular shape is in contact with the spacer part (4),
It may be configured to apply force to the fixed diaphragm (5) at its diagonal tip.
第２図（Ａ）に示されているような厚さ（−）を有し、
断面が三角形状のレンズ固定部材（１）を矢印（Ｃ）方
向に圧縮した場合、圧縮シロ（ａ）が増大すると圧縮面
積（ｂ）は第３図に示すようにゆるやかに増大する。前
述したように弾性部材の圧縮力は、圧縮面積（ｂ）とほ
ぼ比例するので、圧縮シロ（ａ）が太き（変化しても本
実施例のレンズ固定部材（■）の圧縮力の変化量は小さ
く、前記誤差が大きくても安定した圧力がレンズ（Ｇ３
）に加えられる。having a thickness (-) as shown in FIG. 2(A),
When the lens fixing member (1) having a triangular cross section is compressed in the direction of the arrow (C), as the compression margin (a) increases, the compression area (b) gradually increases as shown in FIG. As mentioned above, the compression force of the elastic member is almost proportional to the compression area (b), so even if the compression margin (a) is thick (changes), the compression force of the lens fixing member (■) of this example will change. The amount is small, and even if the error is large, the pressure remains stable through the lens (G3
).
ここで、圧縮方向における三角形の頂角θの望ましい範
囲は次の通りである。Here, the desirable range of the apex angle θ of the triangle in the compression direction is as follows.
１５６〈θ＜６０’
頂角θの値が下限を越えると、所定の圧縮力を発生させ
ることが非常に困難になる。逆に頂角θの値が上限を越
えると、圧縮シロ（ａ）の増大による圧縮面積（ｂ）の
増加が激しくなり、圧縮シロの変化に対する圧縮力の変
化量が大きくなり、従来の０リング等を使用したレンズ
固定部材と同様の問題が発生する。156<θ<60' If the value of the apex angle θ exceeds the lower limit, it becomes extremely difficult to generate a predetermined compressive force. On the other hand, when the value of the apex angle θ exceeds the upper limit, the compression area (b) increases sharply due to the increase in the compression margin (a), and the amount of change in the compression force with respect to the change in the compression margin becomes large. A problem similar to that of a lens fixing member using a lens fixing member such as the like occurs.
また、第２図（Ａ）に示されているレンズ固定部材（１
）において、三角形状の断面の矢印（Ｃ）方向から直接
圧力が加わる角の対辺の寸法が部材（１）の厚さ（讐）
の２分の１近辺である場合、レンズ（Ｇ３）を固定する
圧力の安定性とレンズ固定部材（１）の圧縮変形の安定
性とのバランスがよいので好ましい。In addition, the lens fixing member (1) shown in FIG.
), the dimension of the opposite side of the corner to which pressure is applied directly from the direction of arrow (C) of the triangular cross section is the thickness of member (1).
It is preferable that the pressure is approximately one-half of , since there is a good balance between the stability of the pressure for fixing the lens (G3) and the stability of compressive deformation of the lens fixing member (1).
尚、第１図に示す本実施例においては、温度変化によっ
てレンズ（Ｇ３）がスラスト方向に膨張又は収縮した場
合であっても、前記誤差によって圧縮シロ（ａ）が変化
した場合と同様にレンズ（Ｇ３）に加わる圧力の変化は
小さいので、レンズ（Ｇ３）の歪や変形は抑制される。In this embodiment shown in FIG. 1, even if the lens (G3) expands or contracts in the thrust direction due to a temperature change, the lens (G3) will be damaged in the same way as when the compression margin (a) changes due to the error. Since the change in the pressure applied to (G3) is small, distortion and deformation of lens (G3) is suppressed.
第５図（八）及び（Ｂ）はそれぞれ本発明の他の実施例
に用いるレンズ固定部材の断面形状を示している。第５
図（Ａ）及び（Ｂ）の断面形状を有するレンズ固定部材
を用いた場合でも、第１図の実施例と同様の効果がある
。FIGS. 5(8) and 5(B) respectively show cross-sectional shapes of lens fixing members used in other embodiments of the present invention. Fifth
Even when using a lens fixing member having the cross-sectional shapes shown in FIGS. (A) and (B), the same effects as in the embodiment shown in FIG. 1 can be obtained.
上記実施例においては、プラスチックレンズを固定する
レンズ鏡胴について説明したが、本発明のレンズ鏡胴は
プラスチックレンズ以外のレンズについても適用するこ
とが可能である。In the above embodiments, a lens barrel for fixing a plastic lens has been described, but the lens barrel of the present invention can also be applied to lenses other than plastic lenses.
又皿曵募来
以上説明したように本発明によれば、レンズに対する圧
縮シロが変化しても、圧縮シロに対するレンズ固定部材
の圧縮力は大きく変化せず、安定した圧力でレンズの固
定を行いうるレンズ鏡胴を実現することができる。従っ
て、レンズの歪や変形が生じることなく、レンズ鏡胴に
対してレンズを正確に、且つ安定して固定することが可
能となる。In addition, as explained above, according to the present invention, even if the compression margin for the lens changes, the compression force of the lens fixing member against the compression margin does not change significantly, and the lens is fixed with a stable pressure. It is possible to realize a transparent lens barrel. Therefore, the lens can be accurately and stably fixed to the lens barrel without distortion or deformation of the lens.
第１図は本発明を実施したレンズ鏡胴の断面図である。
第２図は本発明の実施例及び従来例に用いるレンズ固定
部材の圧縮前後の状態を示す断面図であり、第３図及び
第４図はそれぞれ本発明の実施例及び従来例に用いるレ
ンズ固定部材の圧縮シロに対する圧縮面積の関係を示す
グラフである。
第５図は本発明の他の実施例に用いるレンズ固定部材の
断面図である。
（１）−レンズ固定部材、 （２）−玉枠。
（３）−・玉押え、 （４） −間隔部品。
（５）・・・−固定絞り、（６）・−ネジ部。
（Ｇｌ） （Ｇ２） （Ｇ３） （Ｇ４）−ｍ−レンズ
。FIG. 1 is a sectional view of a lens barrel embodying the present invention. FIG. 2 is a sectional view showing the state before and after compression of the lens fixing member used in the embodiment of the present invention and the conventional example, and FIGS. 3 and 4 are sectional views showing the lens fixing member used in the embodiment of the present invention and the conventional example, respectively. It is a graph which shows the relationship of the compression area with respect to the compression white of a member. FIG. 5 is a sectional view of a lens fixing member used in another embodiment of the present invention. (1) - Lens fixing member, (2) - Lens frame. (3) - Ball presser, (4) - Spacing parts. (5)...-Fixed diaphragm, (6)...-Threaded part. (Gl) (G2) (G3) (G4) -m-lens.
Claims (2)
レンズ固定部材が設けられたレンズ鏡胴であって、該レ
ンズ固定部材が前記レンズの全周に均一に圧力を加える
リング状で、且つ断面が略三角形状の弾性体であること
を特徴とするレンズ鏡胴。(1) A lens barrel provided with a lens fixing member that fixes the lens to the lens frame by compressive force caused by pressing, the lens fixing member having a ring shape that applies pressure uniformly to the entire circumference of the lens, and A lens barrel characterized by being an elastic body having a substantially triangular cross section.
を特徴とする第１請求項に記載のレンズ鏡胴。(2) The lens barrel according to claim 1, wherein the lens fixing member is made of silicone rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2192489A JPH02201302A (en) | 1989-01-30 | 1989-01-30 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2192489A JPH02201302A (en) | 1989-01-30 | 1989-01-30 | Lens barrel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02201302A true JPH02201302A (en) | 1990-08-09 |
Family
ID=12068619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2192489A Pending JPH02201302A (en) | 1989-01-30 | 1989-01-30 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02201302A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555480A (en) * | 1993-07-12 | 1996-09-10 | Asahi Kogaku Kogyo Kabushiki Kaisha | Lens holding structure |
| WO2006046396A1 (en) * | 2004-10-28 | 2006-05-04 | Matsushita Electric Industrial Co., Ltd. | Camera module |
| US7088530B1 (en) | 2005-01-28 | 2006-08-08 | Eastman Kodak Company | Passively aligned optical elements |
-
1989
- 1989-01-30 JP JP2192489A patent/JPH02201302A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555480A (en) * | 1993-07-12 | 1996-09-10 | Asahi Kogaku Kogyo Kabushiki Kaisha | Lens holding structure |
| WO2006046396A1 (en) * | 2004-10-28 | 2006-05-04 | Matsushita Electric Industrial Co., Ltd. | Camera module |
| CN100473120C (en) | 2004-10-28 | 2009-03-25 | 松下电器产业株式会社 | camera module |
| US7088530B1 (en) | 2005-01-28 | 2006-08-08 | Eastman Kodak Company | Passively aligned optical elements |
| WO2006083649A1 (en) * | 2005-01-28 | 2006-08-10 | Eastman Kodak Company | Passively aligned optical elements |
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