JPS6160407B2 - - Google Patents
Info
- Publication number
- JPS6160407B2 JPS6160407B2 JP56186252A JP18625281A JPS6160407B2 JP S6160407 B2 JPS6160407 B2 JP S6160407B2 JP 56186252 A JP56186252 A JP 56186252A JP 18625281 A JP18625281 A JP 18625281A JP S6160407 B2 JPS6160407 B2 JP S6160407B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens holding
- ring
- holding
- holding mechanism
- 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.)
- Expired
Links
- 230000007246 mechanism Effects 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000004033 plastic Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Description
【発明の詳細な説明】
本発明はカメラレンズ等の光学器機におけるレ
ンズ保持機構に係り、特に比較的耐温度性の弱い
プラスチツクレンズに用いて好適なレンズ保持機
構に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens holding mechanism for an optical device such as a camera lens, and particularly to a lens holding mechanism suitable for use with a plastic lens having relatively low temperature resistance.
一般に、カメラレンズ等の光学系のレンズ保持
機構は第１図のように構成されている。各部を簡
単に説明すると、４はレンズ胴付部であり、この
胴付部４の内側にはレンズの嵌合部５が形成され
ている。部組に際しては先ず上記嵌合部５へ例え
ば凸レンズ７を嵌入させ、次いで鏡枠２の内壁に
形成されたねじ部３に螺合する押え環１をねじこ
むことにより当該押え環１の内径部をレンズ７の
周縁部に当接させレンズを保持している。 Generally, a lens holding mechanism for an optical system such as a camera lens is constructed as shown in FIG. To briefly explain each part, numeral 4 is a lens mounting part, and a lens fitting part 5 is formed inside this barrel mounting part 4 . When assembling the parts, first, for example, the convex lens 7 is fitted into the fitting part 5, and then the presser ring 1 that is screwed into the threaded part 3 formed on the inner wall of the lens frame 2 is screwed in, thereby tightening the inner diameter part of the presser ring 1. is brought into contact with the peripheral edge of the lens 7 to hold the lens.
ところで、係るレンズ保持機構において、例え
ば常温にて部組されたものを高温状態下又は低温
状態下においた場合には各部の線膨張率の差異に
より以下に述べる弊害を招来する。即ち、レンズ
７を形成する素材の線膨張率が鏡枠２及び押え環
１を形成する素材の線膨張率よりも大きいために
例えば高温状態下ではレンズ７の体積増加分が鏡
枠２及び押え環１の同増加分を上回ることにな
る。一方、レンズ保持機構はそもそもレンズ７を
固定する目的で構成されるものであるから上記の
如く既に常温状態下で設計クリアランスに部組さ
れており、この結果高温状態下にあつては直接レ
ンズの面形状に影響を与えることになる。特にこ
の影響は押え環１に対するレンズ７の周縁当接部
において最も顕著に表われ、またレンズを形成す
る素材の硬度が比較的小さいプラスチツクレンズ
において著しい。当該当接部の一部拡大構成図
（第１図一点鎖線円Ａ部）を第２図に示す。同図
からも明らかなようにレンズ７と押え環１の当接
部８においてはレンズ７の膨張による応力が集中
しレンズ７の表面に凹みが生じてしまう。 By the way, in such a lens holding mechanism, when parts assembled at room temperature are placed under high temperature or low temperature conditions, the following disadvantages arise due to differences in linear expansion coefficients of each part. That is, since the coefficient of linear expansion of the material forming the lens 7 is larger than that of the material forming the lens frame 2 and the presser ring 1, for example, under high temperature conditions, the increase in the volume of the lens 7 causes the lens frame 2 and the presser ring 1 to expand. This will exceed the same increase in Ring 1. On the other hand, since the lens holding mechanism is originally constructed for the purpose of fixing the lens 7, it is already assembled to the design clearance under normal temperature conditions as described above, and as a result, under high temperature conditions, it cannot be directly attached to the lens. This will affect the surface shape. In particular, this effect is most noticeable at the peripheral edge contact portion of the lens 7 with the presser ring 1, and is also significant in plastic lenses where the hardness of the material forming the lens is relatively low. FIG. 2 shows a partially enlarged configuration diagram of the abutting portion (dotted chain line circle A section in FIG. 1). As is clear from the figure, the stress due to the expansion of the lens 7 is concentrated at the abutting portion 8 between the lens 7 and the presser ring 1, causing a dent in the surface of the lens 7.
この状態をさらに詳細に説明すれば、レンズ７
は高温状態になるに従つてラジアル方向へ膨張し
ようとするが、上記の如くレンズ７の周縁部は押
え環１にて規制されているためラジアル方向への
膨張は阻止される。また、この規制によりレンズ
の内部では熱応力が発生するが、この熱応力を打
消すように規制がされていないレンズの光軸方向
へ膨張することになり、この結果第３図に示すよ
うにレンズ光軸上の球面は常温状態下で位置Ｐに
あつたにもかかわらず高温状態下では位置P1にま
で膨張し、レンズの曲率半径はｒ＝OPからｒ＝
1 1となりレンズの曲率半径は小さくなる。な
お、この場合レンズの球面である弧の長さを常温
時l0、常温時よりｔ℃温度が高いときをl1、レン
ズの線膨張率をαとすると
l1≒l0・（１＋αｔ）
で近似することができる。 To explain this state in more detail, the lens 7
tends to expand in the radial direction as the temperature increases, but as described above, the peripheral edge of the lens 7 is restricted by the retainer ring 1, so that expansion in the radial direction is prevented. Also, due to this regulation, thermal stress is generated inside the lens, but the unregulated lens expands in the optical axis direction to cancel this thermal stress, and as a result, as shown in Figure 3. Although the spherical surface on the optical axis of the lens is at position P under normal temperature conditions, it expands to position P 1 under high temperature conditions, and the radius of curvature of the lens changes from r=OP to r=
1 1 , and the radius of curvature of the lens becomes smaller. In this case, if the length of the arc that is the spherical surface of the lens is l 0 at room temperature, l 1 is when the temperature is t°C higher than room temperature, and α is the linear expansion coefficient of the lens, then l 1 ≒l 0・(1+αt) It can be approximated by
他方、低温状態下にあつても事情は上記高温状
態下における場合と同様であるが現象は反対とな
る。即ちレンズ７を形成する素材の線膨張係数の
ほうが鏡枠２及び押え環１を形成する素材の線膨
張係数より大なるため低温になるに従つて、鏡枠
２及び押え環１が収縮する以上にレンズ７は収縮
しようとするがレンズ７の周縁部は押え環１によ
り規制されているためレンズ７は押え環１の収縮
以上に収縮することはできない。この場合レンズ
７の内部に熱応力が発生し、この熱応力を打消す
ようにレンズは光軸方向へ収縮することになる。
この結果第４図に示すようにレンズ７の光軸上の
球面は常温状態下で位置Ｐにあつたものが低温状
態下では位置P2にまで偏移し、レンズ７の曲率半
径はｒ＝OPからr2＝2 2となり前記高温状態下
における場合と全く逆に大きくなる現象を呈する
ことになる。なお、この場合レンズの弧の長さを
常温時l0、常温時よりｔ℃温度が低い時l2、レン
ズの線膨張率をαとすると
l2≧l0・（１−αｔ）
で近似することができる。 On the other hand, even under low temperature conditions, the situation is similar to that under high temperature conditions, but the phenomenon is opposite. In other words, the coefficient of linear expansion of the material forming the lens 7 is larger than that of the materials forming the lens frame 2 and the retainer ring 1, so as the temperature decreases, the lens frame 2 and the retainer ring 1 contract. The lens 7 tries to contract, but since the peripheral edge of the lens 7 is restricted by the presser ring 1, the lens 7 cannot be contracted more than the contraction of the presser ring 1. In this case, thermal stress is generated inside the lens 7, and the lens contracts in the optical axis direction to cancel this thermal stress.
As a result, as shown in Fig. 4, the spherical surface on the optical axis of lens 7, which was at position P under normal temperature conditions, shifts to position P 2 under low temperature conditions, and the radius of curvature of lens 7 is r = From OP, r 2 = 2 2 , and a phenomenon that increases, which is completely opposite to the case under the above-mentioned high temperature condition, occurs. In this case, if the arc length of the lens is l 0 at room temperature, l 2 when the temperature is t℃ lower than room temperature, and the linear expansion coefficient of the lens is α, then it is approximated by l 2 ≧l 0・(1−αt) can do.
このような従来におけるレンズ保持機構では温
度変化によりレンズの曲率半径が変化してしまい
常温下で正確に部組されたものであつても使用す
る温度によりレンズのピント位置が大きくずれた
り、また各種収差等の光学特性の悪化を招く原因
となつていた。特に比較的耐温度性の弱いプラス
チツクレンズにおいてはその弊害が著しいもので
ある。 In such conventional lens holding mechanisms, the radius of curvature of the lens changes due to temperature changes, and even if the parts are assembled accurately at room temperature, the focal position of the lens may shift significantly depending on the temperature at which it is used. This has been a cause of deterioration of optical characteristics such as aberrations. This problem is particularly severe in plastic lenses, which have relatively low temperature resistance.
本発明は係る弊害を除去するものであり、比較
的耐温度性の弱いプラスチツクレンズであつても
温度変化に影響されない耐温度性の強いレンズ保
持機構を構成し、プラスチツクレンズの使用温度
範囲の拡大を目的とするものである。更に本発明
の他の目的はプラスチツクレンズの応力緩和によ
つて生じていた前記押え環１のゆるみを防止しレ
ンズのガタつき発生を排除せんとするものであ
り、具体的には鏡枠内のレンズ胴付部にレンズを
押え環にて保持するに際し、上記レンズの胴付部
及び（又は）押え環の周面にレンズ径方向の弾性
を有する片持梁状のレンズ保持部を連続的又は間
欠的に設けるとともに、レンズに上記レンズ保持
部と係合する係合部を設けて構成したことを特徴
とするものである。 The present invention eliminates such disadvantages, and constitutes a lens holding mechanism with strong temperature resistance that is unaffected by temperature changes even when the plastic lens has relatively low temperature resistance, thereby expanding the operating temperature range of the plastic lens. The purpose is to Another object of the present invention is to prevent the retainer ring 1 from loosening, which occurs due to stress relaxation in the plastic lens, and to eliminate rattling of the lens. When holding the lens on the lens barrel part with a holding ring, a cantilever-shaped lens holding part having elasticity in the lens radial direction is continuously or The lens is provided intermittently and is characterized in that the lens is provided with an engaging portion that engages with the lens holding portion.
以下、本発明に適用する種々の実施例について
図面を参照して詳細に説明する。 Hereinafter, various embodiments applied to the present invention will be described in detail with reference to the drawings.
第５図は本発明に係る第１実施例を示し、同図
ａはレンズ保持機構の光軸を含む側面断面図であ
る。図中９は鏡枠、１０はレンズ胴付部であり、
この胴付部１０のレンズ保持側には本発明に従つ
てレンズ保持部１２が形成される。このレンズ保
持部１２は上記レンズ胴付部１０に固着し、又は
一体形成され、その形状は第５図ａに示す如く片
持梁状に形成される。なお、レンズ保持部１２は
同図ａに示すＣ―C′線断面図である同図ｂ（レ
ンズ保持部１２の断面のみ示す）の如くレンズ胴
付部１０の周面に沿つて間欠的に設けられるとと
もに、薄板状の外側レンズ保持板１２ａ及び内側
レンズ保持板１２ｂにて形成される。他方、レン
ズ１３の周縁部１３ａには上記レンズ保持部１２
の先端が係合、望ましくは嵌合する凹部である係
合部１３ｂが穿設され、上記レンズ保持部１２に
保持固定される。そして、外周にねじを形成した
押え環１４をねじ部１１に螺合してねじ込み、レ
ンズ１３を保持している。なお、この押え環１４
の形成素材は金属、合成樹脂をはじめ摩擦減衰部
材であるテフロン（四弗化エチレン）系素材等を
利用することができる。また、上記レンズ保持部
の構成は上記した如くレンズ胴付部の周面に沿つ
て間欠的に設ける他、連続的に設けてもよく、更
に本実施例では外側と内側に二枚の薄板状に形成
してあるが、その他第５図ｃに示す如く一枚の薄
板状又は図示しないが例えば円柱状等に形成した
レンズ保持部１５として構成してもよく、また、
同図ｄに示す如くその断面形状をＶ字形状に形成
することもできるものであり要はレンズ１３を保
持すべく片持梁状に形成されていればよく、レン
ズ保持部の形状は本発明を限定するものではな
い。例えば図示しないが断面形状が逆Ｖ字形、Ｕ
字形等種々の形状も本発明範囲を逸脱するもので
はなく、いずれもレンズ１３に設けた係合部に光
学特性に影響しない許容公差内で係合すべく状態
となる大きさ、又は形状であればよい。なお、上
記第５図ｃ及びｄは同図ａに示す鎖線円Ｂ部の部
分拡大図である。しかして、係る実施例によれば
保持すべきレンズは常温時においてはレンズ保持
部及び押え環によつて光軸方向の位置が決定さ
れ、また、レンズに設けた係合部と上記レンズ保
持部が係合固定されることにより径方向の位置が
決定される。他方、高温状態下においては第５図
ｃに示す二点鎖線の如くレンズ１３がラジアル方
向へ一様に膨張するがレンズの周縁部１３ａはレ
ンズ径方向に弾性を有するレンズ保持部１５に係
合されているため１３ａの位置まで変位すること
ができ、このため従来の如きレンズの膨張が規制
されることはない。なお、このことは低温状態下
においても同様の効果を得ることができることは
容易に理解できるであろう。 FIG. 5 shows a first embodiment of the present invention, and FIG. 5a is a side sectional view including the optical axis of the lens holding mechanism. In the figure, 9 is a lens frame, 10 is a lens barrel attachment part,
According to the present invention, a lens holding section 12 is formed on the lens holding side of this barrel mounting section 10. This lens holding part 12 is fixed to or integrally formed with the lens mounting part 10, and has a cantilever shape as shown in FIG. 5a. In addition, the lens holding part 12 is intermittently moved along the circumferential surface of the lens barrel attachment part 10 as shown in FIG. It is formed by an outer lens holding plate 12a and an inner lens holding plate 12b in the form of thin plates. On the other hand, the lens holder 12 is attached to the peripheral edge 13a of the lens 13.
An engaging portion 13b, which is a concave portion into which the tip of the lens engages, preferably fits, is bored, and is held and fixed to the lens holding portion 12. A holding ring 14 having a thread formed on the outer periphery is screwed into the threaded portion 11 to hold the lens 13. Note that this presser ring 14
As the forming material, metals, synthetic resins, and Teflon (tetrafluoroethylene) materials, which are friction damping members, can be used. In addition, the structure of the lens holding part may be provided intermittently along the circumferential surface of the lens barrel mounting part as described above, or it may be provided continuously. However, as shown in FIG.
As shown in Fig. d, the cross-sectional shape can be formed into a V-shape, but the point is that it is sufficient that it is formed into a cantilever shape to hold the lens 13, and the shape of the lens holding part is according to the present invention. It is not limited to. For example, although not shown, the cross-sectional shape is an inverted V-shape, a U-shape, etc.
Various shapes such as letter shapes do not depart from the scope of the present invention, and any size or shape can be used to engage the engaging portion provided on the lens 13 within tolerances that do not affect the optical characteristics. Bye. Note that FIGS. 5c and 5d are partially enlarged views of the chain line circle B shown in FIG. 5a. According to this embodiment, the position of the lens to be held in the optical axis direction is determined by the lens holding part and the holding ring at room temperature, and the engaging part provided on the lens and the lens holding part The radial position is determined by being engaged and fixed. On the other hand, under high temperature conditions, the lens 13 uniformly expands in the radial direction as shown by the two-dot chain line in FIG. Because of this, the lens can be displaced to the position 13a, and therefore the expansion of the lens is not restricted as in the conventional case. It should be noted that it is easy to understand that the same effect can be obtained even under low temperature conditions.
次に本発明に係る第２実施例いついて第６図を
参照して説明する。第６図ａはレンズ保持機構の
光軸を含む側面断面図である。第１実施例と異な
る点は片持梁状のレンズ保持部を押え環に設けた
ことである。先ず同図中９は鏡枠、１０はレンズ
胴付部、１０ａはレンズ胴付面である。レンズ１
３は、このレンズ胴付面にその周縁部１３ａを当
接させ鏡枠９側から押え環１７にて保持される。
この押え環１７は本発明に従つてレンズ当接側で
ある周面に片持梁状のレンズ保持部１９が設けら
れており、レンズの周縁に形成された係合、望ま
しくは嵌合すべく形成された凹部である係合部１
３ｃに保持固定される。この場合押え環の組付け
方法は、第１実施例と異なり鏡枠９にアンダーカ
ツトされた係止部２０に押え環１７の外周に形成
した係止片１８を係止して固定する（第６図ａ又
はｂ参照）。したがつて、鏡枠９の内壁部にはね
じ部は形成されておらず、また、押え環１７の外
径は鏡枠９の内径より大に形成し部組に際しては
圧入して組付けすることになり、したがつて押え
環は樹脂等の弾性係数の大なる素材で形成され
る。なお、係る押え環の組付方法は第１実施例と
同様ねじ込みによる方法でも勿論実施することが
できるものであり、また、レンズ保持部１３の形
状又は構成方法は第１実施例に準じて同様に実施
することができる。第６図ｂにはレンズ２１の表
裏が同図ａと逆に取付ける場合の実施例を示した
ものである。 Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6a is a side sectional view including the optical axis of the lens holding mechanism. The difference from the first embodiment is that a cantilever-shaped lens holding portion is provided on the holding ring. First, in the figure, 9 is a lens frame, 10 is a lens barrel mounting portion, and 10a is a lens barrel mounting surface. lens 1
3 is held by a presser ring 17 from the lens frame 9 side with its peripheral edge 13a in contact with this lens barrel mounting surface.
According to the present invention, this presser ring 17 is provided with a cantilever-shaped lens holding portion 19 on the peripheral surface on the lens contact side, and is preferably fitted with a cantilever-shaped lens holding portion 19 formed on the peripheral edge of the lens. Engagement part 1 which is a formed recess
It is held and fixed at 3c. In this case, the method of assembling the presser ring 17 is different from the first embodiment in that the locking piece 18 formed on the outer periphery of the presser ring 17 is locked and fixed to the locking portion 20 undercut in the lens frame 9. (See Figure 6 a or b). Therefore, no threaded portion is formed on the inner wall of the lens frame 9, and the outer diameter of the retaining ring 17 is made larger than the inner diameter of the lens frame 9, and is press-fitted when assembling the parts. Therefore, the presser ring is made of a material with a large elastic modulus, such as resin. Note that the method of assembling the retaining ring can of course be carried out by screwing as in the first embodiment, and the shape or construction method of the lens holding part 13 can be carried out in the same manner as in the first embodiment. can be implemented. FIG. 6b shows an embodiment in which the lens 21 is attached with the front and back sides reversed from those shown in FIG. 6a.
なお、上記第６図ｂは同図ａに示す鎖線円Ｄ部
の部分拡大図である。しかして、第２実施例にお
いても押え環に設けたレンズ径方向に弾性を有す
るレンズ保持部の作用により第１実施例と同様の
効果を得ることができるものである。 Note that FIG. 6b is a partially enlarged view of the chain line circle D shown in FIG. 6a. Therefore, in the second embodiment as well, the same effects as in the first embodiment can be obtained due to the action of the lens holding portion provided on the holding ring and having elasticity in the lens radial direction.
以上、上記各実施例はレンズ胴付部及び（又
は）押え環の周面にレンズ径方向の弾性を有する
片持梁状のレンズ保持部を連続的又は間欠的に設
ける場合、及びレンズに上記レンズ保持部と係合
部を設ける場合の例示的構成方法を示すものであ
り、他の各種の形状的、構成的変形にても同様に
実施することができるものである。 As described above, each of the above-mentioned embodiments is applicable to cases in which a cantilever-shaped lens holding part having elasticity in the lens radial direction is continuously or intermittently provided on the circumferential surface of the lens barrel mounting part and/or the holding ring, and This shows an exemplary configuration method in the case of providing a lens holding part and an engaging part, and it can be similarly implemented with various other shape and configuration modifications.
斯くして、本発明によれば、レンズ径方向に弾
性を有する片持梁状のレンズ保持部にてレンズを
保持する為、温度変化に基づくレンズの膨張・収
縮を吸収し、レンズの曲率半径の変化を防止する
ことができこの結果、各種実施例によるいずれの
態様においてもレンズの曲率半径の変化によるピ
ント位置のずれ、あるいは各種収差の悪化を防止
することができ、この結果、比較的温度性の弱い
プラスチツクレンズであつてもその使用温度範囲
の拡大を図ることができる。 Thus, according to the present invention, since the lens is held by the cantilever-shaped lens holding portion having elasticity in the lens radial direction, expansion and contraction of the lens due to temperature changes is absorbed, and the radius of curvature of the lens is As a result, in any of the embodiments of the various embodiments, it is possible to prevent the focus position from shifting due to changes in the radius of curvature of the lens or from worsening of various aberrations. Even if the plastic lens has weak properties, the temperature range in which it can be used can be expanded.
更に、本発明においては、従来プラスチツクレ
ンズの温度変化、振動等によるレンズ保持機構に
おけるレンズのガタつきも防止することができ
る。このように本発明によるレンズ保持機構では
上記の如き各種光学特性の劣化を防止することが
でき、具体的には熱膨張又は収縮によるレンズ
NRは従来下（第１図参照）においては10本以上
であつたものが本発明下においては２〜３本に改
善され、さらにまた、上記の如き光軸のずれによ
る「片愡け」、「デイストーシヨン」その他の収差
による光学的特性の低下を防止する等種々の技術
的効果を得ている。 Furthermore, in the present invention, it is possible to prevent the lens from shaking in the lens holding mechanism due to temperature changes, vibrations, etc. of conventional plastic lenses. In this way, the lens holding mechanism according to the present invention can prevent the deterioration of various optical properties as described above, and specifically, it is possible to prevent the lens from deteriorating due to thermal expansion or contraction.
The NR was improved from 10 or more in the conventional system (see Figure 1) to 2 to 3 in the present invention, and furthermore, the NR was improved from 10 or more in the conventional system (see Figure 1) to 2 to 3 in the present invention. Various technical effects have been achieved, such as preventing deterioration of optical characteristics due to "distortion" and other aberrations.
第１図は従来下においけるレンズ保持機構の一
例を示す光軸を含む側面断面図、第２図は第１図
における一点鎖線円Ａ部の部分拡大図、第３図は
従来下に係るレンズ保持機構の高温時における弊
害を表わす説明図、第４図は従来下に係るレンズ
保持機構の低温時における弊害を表わす説明図、
第５図は本発明に係る第１実施例を示し、同図ａ
はレンズ保持機構の光軸を含む側面断面図、同図
ｂは同図ａのＢ―B′線断面図におけるレンズ保持
部の構成図、同図ｃ及びｄは同図ａに示す鎖線円
Ｂ部の部分拡大図。第６図は本発明に係る第２実
施例を示し、同図ａはレンズ保持機構の光軸を含
む側面断面図、同図ｂは同図ａに示す鎖線円Ｄ部
の部分拡大図である。
１２，１５，１６，１９…レンズ保持部、１２
ａ…外側レンズ保持板、１２ｂ…内側レンズ保持
板、１３，２１，２２…レンズ、１３ａ，２１ａ
…レンズ周縁部、１３ｂ，１３ｃ，２１ｂ…係合
部、１７…押え環、１８…係止片、２０…係止
部。
Fig. 1 is a side cross-sectional view including the optical axis showing an example of the conventional lower lens holding mechanism, Fig. 2 is a partial enlarged view of the dashed-dotted line circle A section in Fig. 1, and Fig. 3 is the conventional lower lens holding mechanism. FIG. 4 is an explanatory diagram showing the disadvantages of the lens holding mechanism at high temperatures; FIG. 4 is an explanatory diagram showing the disadvantages of the conventional lens holding mechanism at low temperatures;
FIG. 5 shows a first embodiment according to the present invention, and FIG.
is a side sectional view including the optical axis of the lens holding mechanism, b is a configuration diagram of the lens holding part taken along the line B-B' in a of the same figure, and c and d are the dashed line circle B shown in the figure a. Partially enlarged view of the section. FIG. 6 shows a second embodiment of the present invention, in which FIG. 6a is a side sectional view including the optical axis of the lens holding mechanism, and FIG. . 12, 15, 16, 19... Lens holding part, 12
a...Outer lens holding plate, 12b...Inner lens holding plate, 13, 21, 22... Lens, 13a, 21a
... Lens peripheral edge portion, 13b, 13c, 21b... Engaging portion, 17... Holding ring, 18... Locking piece, 20... Locking portion.
Claims (1)
保持するレンズ保持機構において、上記レンズ胴
付部及び／又は押え環の周面に設けたレンズ径方
向の弾性を有し光軸方向に突設したレンズ保持部
と、上記レンズに上記レンズ保持部が嵌入する係
合孔とを具備し、レンズが光軸に対し直角方向に
変位したとき上記弾性を有したレンズ保持部の撓
みによりその変位を吸収するようにしたことを特
徴とするレンズ保持機構。1. In a lens holding mechanism in which a lens is held by a holding ring on a lens mounting part in a lens frame, the lens has elasticity in the radial direction of the lens provided on the circumferential surface of the lens mounting part and/or the holding ring, and is elastic in the optical axis direction. a lens holder protruding from the lens, and an engagement hole into which the lens holder fits into the lens, and when the lens is displaced in a direction perpendicular to the optical axis, the elastic lens holder is bent. A lens holding mechanism characterized by absorbing the displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18625281A JPS5887508A (en) | 1981-11-20 | 1981-11-20 | Lens holding mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18625281A JPS5887508A (en) | 1981-11-20 | 1981-11-20 | Lens holding mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5887508A JPS5887508A (en) | 1983-05-25 |
| JPS6160407B2 true JPS6160407B2 (en) | 1986-12-20 |
Family
ID=16185011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18625281A Granted JPS5887508A (en) | 1981-11-20 | 1981-11-20 | Lens holding mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5887508A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6117110A (en) * | 1984-07-03 | 1986-01-25 | Konishiroku Photo Ind Co Ltd | Lens holding device |
| JP2560288B2 (en) * | 1986-04-23 | 1996-12-04 | 富士ゼロックス株式会社 | Optical writing device |
| SE458072B (en) * | 1987-07-03 | 1989-02-20 | Ericsson Telefon Ab L M | DEVICE FOR AT VARIOUS TEMPERATURE KEEPING AN OPTICAL LENS IN DESIRED LOCATION IN A LENS FITTING |
| JP3841761B2 (en) * | 2003-02-17 | 2006-11-01 | カンタツ株式会社 | Photographing lens and optical apparatus using the photographing lens |
| JP2009210693A (en) * | 2008-03-03 | 2009-09-17 | Canon Inc | Optical element holding device |
| CN209525506U (en) * | 2018-11-19 | 2019-10-22 | 瑞声科技(新加坡)有限公司 | A kind of lens module |
| CN209525500U (en) * | 2018-11-19 | 2019-10-22 | 瑞声科技(新加坡)有限公司 | A kind of lens module |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB906278A (en) * | 1959-09-05 | 1962-09-19 | Hensoldt & Soehne Optik | Lens mount |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5932968Y2 (en) * | 1978-11-24 | 1984-09-14 | オリンパス光学工業株式会社 | Lens fixing mechanism to lens frame |
| JPH019924Y2 (en) * | 1979-07-02 | 1989-03-20 |
-
1981
- 1981-11-20 JP JP18625281A patent/JPS5887508A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB906278A (en) * | 1959-09-05 | 1962-09-19 | Hensoldt & Soehne Optik | Lens mount |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5887508A (en) | 1983-05-25 |
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