JPS6197608A - Lens holding part - Google Patents
Lens holding partInfo
- Publication number
- JPS6197608A JPS6197608A JP21796884A JP21796884A JPS6197608A JP S6197608 A JPS6197608 A JP S6197608A JP 21796884 A JP21796884 A JP 21796884A JP 21796884 A JP21796884 A JP 21796884A JP S6197608 A JPS6197608 A JP S6197608A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- change
- temp
- elastic body
- changed
- 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
【発明の詳細な説明】
本発明はレンズ保持部に関し、特に光学弾性体より成る
レンズをレンズ鏡筒内に保持する際のレンズ保持部に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens holder, and more particularly to a lens holder for holding a lens made of an optical elastic body within a lens barrel.
本出願人は、先に光学弾性体より成るレンズにおいて機
械的若しくは電気的にレンズ形状を変化させて所望の屈
折力を得ようとするものを、例えば特願昭５９−７７７
４号、特願昭５９−３２９９９号で提案している。同提
案では、光学弾性体としてシリコーンゴムを用いている
。The present applicant previously proposed a method for obtaining a desired refractive power by mechanically or electrically changing the shape of a lens made of an optical elastic body, for example, in Japanese Patent Application No. 59-777.
No. 4, and Japanese Patent Application No. 59-32999. In this proposal, silicone rubber is used as the optical elastic body.
このシリコーンゴムの光学弾性体は容易に形状を変化さ
せることができるので、屈折力可変のレンズとして用い
る場合非常に有効である。しかしながら、一般に光学弾
性体は温度変化により屈折率が大きく変化する性質を有
している。例えば、アクリル樹脂に比べて５倍程度の変
化を示す。この為、レンズ系に用いたとき温度変化によ
り屈折率が大きく変化し、レンズ系の屈折力を大きく異
ならしめてしまうという欠点がある。This silicone rubber optical elastic body can be easily changed in shape, so it is very effective when used as a lens with variable refractive power. However, optical elastic bodies generally have the property that their refractive index changes greatly due to temperature changes. For example, the change is about 5 times that of acrylic resin. For this reason, when used in a lens system, the refractive index changes greatly due to temperature changes, resulting in a drawback that the refractive power of the lens system differs greatly.
本発明は、光学弾性体より成るレンズをレンズ系を用い
たときの温度変化に伴う光学弾性体の屈折率変化を補償
し、良好なる光学性能の得られるレンズ保持部の提供を
目的とする。An object of the present invention is to provide a lens holder that compensates for changes in the refractive index of an optical elastic body due to temperature changes when a lens system is used with a lens made of an optical elastic body, and provides good optical performance.
本発明の目的を達成する為のレンズ保持部の主たる特徴
は、光学弾性体より成るレンズを保持する為の保持環部
の一部に前記光学弾性体の体積膨張の１倍より大きく３
倍より小さい体積膨張を生じせしめる補償部材を配置し
、前記補償部材の体積変化により前記レンズの屈折力を
変化させたことである。The main feature of the lens holding part for achieving the object of the present invention is that a part of the holding ring part for holding a lens made of an optical elastic body has a diameter larger than 1 times the volume expansion of the optical elastic body.
A compensating member that causes a volumetric expansion smaller than twice as much is disposed, and the refractive power of the lens is changed by the volume change of the compensating member.
次に、本発明の一実施例を各図と共に説明する。Next, one embodiment of the present invention will be described with reference to each drawing.
第１図は、本発明の一実施例の概略図である。図中、１
は光学弾性体より成るレンズ、２は保持環部、６はレン
ズ１の押え環、４は弾性体より成る補償部材である。補
償部材４は保持環部２の全周若しくは周囲に適当な間隔
を隔てて配置されている。FIG. 1 is a schematic diagram of one embodiment of the invention. In the figure, 1
2 is a holding ring portion, 6 is a holding ring for the lens 1, and 4 is a compensating member made of an elastic material. The compensation members 4 are arranged around the entire circumference of the retaining ring portion 2 at appropriate intervals.
光学弾性体の屈折率は温度変化により、例えばアクリル
樹脂に比べて５倍程度の変化をする。この為、温度変化
に対して光学弾性体自身による体積膨張のみによっては
光学性能を維持するだけの屈折力を補償することが困難
である。The refractive index of an optical elastic body changes about five times as much as that of, for example, acrylic resin due to temperature changes. For this reason, it is difficult to compensate for the refractive power sufficient to maintain optical performance only by the volume expansion of the optical elastic body itself in response to temperature changes.
そこで、本実施例では温度変化、例えば温度上昇による
光学弾性体の屈折率の低下によるレンズ１の屈折力の変
化を補償する為に保持環部２の一部に押え環３を配置し
、熱彫張係数の大なる補償部材４でレンズ１を圧接する
方向へ移動させてレンズ相当の弾性体体積を変化せしめ
、レンズ１のレンズ面の曲率半径及びレンズ厚を変化さ
せているのである。温度下昇の場合も同様に、補償部材
４でレンズ１の形状を変化させることは言うまでもない
。Therefore, in this embodiment, in order to compensate for the change in the refractive power of the lens 1 due to a temperature change, for example, a decrease in the refractive index of the optical elastic body due to a temperature rise, a presser ring 3 is disposed in a part of the retainer ring 2, and the By moving the lens 1 in the direction of pressure contact with the compensation member 4 having a large engraving coefficient, the volume of the elastic body corresponding to the lens is changed, and the radius of curvature of the lens surface of the lens 1 and the lens thickness are changed. It goes without saying that the shape of the lens 1 is similarly changed by the compensating member 4 in the case of a temperature drop.
特に本実施例においては、補償部材４の体積膨張が光学
弾性体の体積膨張に比べて１倍より大きく６倍より小さ
な値を有する材質及び機構で補償部材４を構成するのが
本発明の目的を達成するのに好ましい。これらの範囲を
逸脱すると、光学弾性体の屈折率変化を補償するのが不
十分となったり又レンズ形状が過度に変化したりしてく
るので好ましくない。Particularly in this embodiment, it is an object of the present invention to configure the compensation member 4 using a material and mechanism whose volumetric expansion is more than 1 times and less than 6 times as large as the volumetric expansion of the optical elastic body. preferred for achieving. If it deviates from these ranges, it is not preferable because compensation for changes in the refractive index of the optical elastic body becomes insufficient or the lens shape changes excessively.
尚、本実施例では、温度変化によりレンズ１のレンズ面
の曲率半径及びレンズ厚が変化するような構成の保持環
部であればどのような構成であっても良い。例えば、第
１図において保持環部２と補償部材４とを一体化して構
成するようにしても良い。In this embodiment, the holding ring may have any structure as long as the radius of curvature and the lens thickness of the lens surface of the lens 1 change due to temperature changes. For example, as shown in FIG. 1, the retaining ring portion 2 and the compensating member 4 may be constructed integrally.
第１図の実施例では、補償部材４で直接保持環部
；２の容量を変化させてレンズ１の形状を変化させたが
、この保持環部２にテコ等の拡大手段を配置してレンズ
１の形状を変化させるようにしても良い。In the embodiment shown in FIG.
Although the shape of the lens 1 is changed by changing the capacitance of the lens 1, the shape of the lens 1 may be changed by disposing an enlarging means such as a lever on the holding ring portion 2.
又、本実施例において、押え環６を特に設けず直接補償
部材４でレンズ１を押圧するようにしても良い。Further, in this embodiment, the lens 1 may be directly pressed by the compensating member 4 without particularly providing the presser ring 6.
又、本実施例では、凸レンズの場合について説明したが
、凹レンズであっても同様に本発明を適用することがで
きる。Further, in this embodiment, the case of a convex lens has been described, but the present invention can be similarly applied to a concave lens.
以上のように、本発明によれば保持環部２の容量を補償
部材４を利用して変化させ、これによってレンズ１の屈
折力を変化させることにより温度変化が生じても所定の
屈折力を有したレンズを得ることができる。As described above, according to the present invention, the capacitance of the retaining ring portion 2 is changed using the compensation member 4, and thereby the refractive power of the lens 1 is changed, thereby maintaining a predetermined refractive power even if a temperature change occurs. It is possible to obtain a lens with
第１図は本発明の一実施例の概略図である。
図中、１は光学弾性体より成るレンズ、２は保持環部、
６は押え環、４は補償部材である。FIG. 1 is a schematic diagram of an embodiment of the present invention. In the figure, 1 is a lens made of an optical elastic body, 2 is a holding ring,
6 is a presser ring, and 4 is a compensation member.
Claims (1)
部に前記光学弾性体の対温度体積膨張の１倍より大きく
３倍より小さい体積膨張を生じせしめる補償部材を配置
し、前記補償部材の体積変化により前記レンズの屈折力
を変化させたことを特徴とするレンズ保持部。A compensating member that causes a volumetric expansion of more than 1 time and less than 3 times the volumetric expansion with respect to temperature of the optical elastic body is disposed in a part of a holding ring portion for holding a lens made of an optical elastic body, and the compensation member A lens holding part characterized in that the refractive power of the lens is changed by changing the volume of the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21796884A JPS6197608A (en) | 1984-10-17 | 1984-10-17 | Lens holding part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21796884A JPS6197608A (en) | 1984-10-17 | 1984-10-17 | Lens holding part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6197608A true JPS6197608A (en) | 1986-05-16 |
Family
ID=16712551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21796884A Pending JPS6197608A (en) | 1984-10-17 | 1984-10-17 | Lens holding part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6197608A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04121704A (en) * | 1990-09-13 | 1992-04-22 | Hitachi Ltd | Projection lens device and projection television device using the same |
| DE102007051291A1 (en) | 2007-10-24 | 2009-04-30 | Jenoptik Laser, Optik, Systeme Gmbh | Adaptable optical system |
-
1984
- 1984-10-17 JP JP21796884A patent/JPS6197608A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04121704A (en) * | 1990-09-13 | 1992-04-22 | Hitachi Ltd | Projection lens device and projection television device using the same |
| DE102007051291A1 (en) | 2007-10-24 | 2009-04-30 | Jenoptik Laser, Optik, Systeme Gmbh | Adaptable optical system |
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