JP4031847B2 - Resin molded lens - Google Patents

Resin molded lens Download PDF

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Publication number
JP4031847B2
JP4031847B2 JP20623297A JP20623297A JP4031847B2 JP 4031847 B2 JP4031847 B2 JP 4031847B2 JP 20623297 A JP20623297 A JP 20623297A JP 20623297 A JP20623297 A JP 20623297A JP 4031847 B2 JP4031847 B2 JP 4031847B2
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JP
Japan
Prior art keywords
lens
effective
resin
pair
holding member
Prior art date
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JP20623297A
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Japanese (ja)
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JPH1152108A (en
Inventor
博之 岩崎
洋一 岩崎
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Fujifilm Corp
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Fujifilm Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、写真用樹脂成形レンズの形状に関するものである。
【0002】
【従来の技術】
現在、写真撮影用のカメラとしては用途や機能に応じて非常に多くの種類のものが製造,販売されている。最近では、いつでも手軽に写真撮影を楽しむことができるように、撮影レンズやシャッタ装置などの撮影機構を組み込んだユニット本体に予め未露光の写真フイルムを内蔵させたレンズ付きフイルムユニットが販売されている。このレンズ付きフイルムユニットは、購入したその場ですぐに写真撮影ができ、また撮影後にもそのまま現像取扱店に出せばよいという簡便性から、一般に広く利用されている。
【0003】
このようなレンズ付きフイルムユニットや低価格帯のカメラにおいては、一般に、撮影レンズとして射出成形法により成形された樹脂レンズが用いられる。この樹脂レンズは、レンズ保持部材に保持させて位置決めされる。従来より、レンズをレンズ保持部材に保持させる際には、押さえ部材をレンズとともにレンズ保持部材に保持させたり、あるいはレンズ保持部材の一部をレンズの周縁部にかしめたり、レンズとレンズ保持部材とを接着するなどの方法により、レンズとレンズ保持部材との間の隙間をなくすようにしている。これにより、レンズがレンズ保持部材内でがたつくことが防止され、レンズの光学性能が良好な状態に維持される。
【0004】
ところで、太陽や室内灯などのように上方に明るい光源がある場所で写真撮影を行ったときに、フレアといわれる現象が生じることが知られている。この現象は、太陽光等の強い光が撮影レンズの周面やレンズ保持部材の内壁などで反射して撮影画面の一部または全面に迷光を与えるために生じるもので、被写体像のコントラストを低下させる。
【0005】
図6は、撮影レンズとして用いられる樹脂成形レンズの一般的な構成を示すものである。レンズ5は、レンズ面6a,6bが形成された有効レンズ部6の外周にコアレンズ部7を一体に設けた構成となっており、コアレンズ部7をレンズ保持枠9に保持させて位置決めされる。このようなレンズ5では、例えば図7に示すように、コアレンズ部7の放射方向の長さLを長く構成し、レンズ面6a,6bとレンズ周面8との距離を長くすることで前述のフレア現象を軽減することができる。すなわち、長さLが長くなるにしたがって、入射光の光路に侵入するレンズ周面8の面積が小さくなるので、このレンズ周面8で反射されて撮影画面側に向かう光の光量も少なくなり、フレアの発生を抑えることができる。
【0006】
【発明が解決しようとする課題】
ところが、この方法をレンズ面が凹状に形成される負レンズに用いると、レンズの周縁部の体積が増大し、レンズの中央部と周縁部との間で射出成形後の樹脂の収縮率に大きな差異を生じてしまう。このため、射出成形後にレンズ面が撓みやすくなり、レンズの面精度を高度に維持することが困難になる。
【0007】
また前述したように、レンズをレンズ保持部材内に固定するためには、レンズをレンズ保持部材に保持させた後に、押さえ部材の装着,かしめ加工,接着などの加工を施さなくてはならない。このため、従来のレンズでは、レンズ保持部材への組み付けに多くの工数を必要とするばかりか、組み付け精度を高度に要求される。
【0008】
本発明は上記の事情を考慮してなされたもので、レンズの面精度を低下させることなく、フレアの発生を抑え、かつレンズ保持部材への組み付けが容易な樹脂成形レンズを提供することを目的とする。
【0009】
【課題を解決するための手段】
上記目的を達成するために、本発明の樹脂成形レンズは、樹脂により射出成形され、レンズ保持部材に保持させた状態で用いられる樹脂成形レンズにおいて、レンズ面が形成された有効レンズ部の外周に一定量の余裕幅を持たせるためのコアレンズ部が設けられているとともに、前記コアレンズ部の周縁部を前記有効レンズ部の最外周部での厚さよりも薄く構成してなる一対の係止部を備え、レンズ全体を撓ませて、前記一対の係止部を前記レンズ保持部材に設けた一対の溝部に嵌め込むことによってレンズ保持部材に固定するものである。
【0010】
前記一対の係止部は、横長に規定された露光画面内に向かう光線が通過する有効光線通過範囲の上部および下部に設けられるものである。また、前記一対の係止部は、露光画面内に向かう光線が通過する有効光線通過範囲の外側の相対向位置に設けられているものである。
【0011】
【発明の実施の形態】
図1は本発明の樹脂成形レンズの第1実施形態を示すものである。レンズ10は、レンズ面が凹状に形成される負レンズであり、樹脂により射出成形される。レンズ10は、レンズ面11a,11bが形成された有効レンズ部11の外周にコアレンズ部12を一体に設けた構成となっている。コアレンズ部12には、有効レンズ部11に近接する位置に、入射光の光路外に階段状に突出した支持部13が設けられている。レンズ10は、支持部13をレンズ保持枠14の内壁に当接させてレンズ開口14aの背面側に位置決めされる。
【0012】
物体側のレンズ面11aに対して鋭角に入射した光はレンズ周面15で露光画面(図示せず)内に反射され、フレア現象を引き起こす。しかし、コアレンズ部12の放射方向の長さLが長くなるほど、入射光の光路に侵入するレンズ周面15の面積が小さくなるので、露光画面内への反射光の光量が減少する。そこで、コアレンズ部12の放射方向の長さLは、レンズ周面15での反射光の光量が、露光画面内に結像された被写体像のコントラストを低下させない程度となるように決定され、通常よりも長く構成される。
【0013】
図2に示すように、コアレンズ部12は、物体側の面12aとレンズ周面15とからなる角部16が面取りされている。この角部16は、レンズ面11aから入射した光の光路を遮らないように面取りされ、面取りによって形成された面取り面16aと入射光の光路とが交叉しないようになっている。
【0014】
上記のように構成されたレンズ10は、有効レンズ部11の外周にコアレンズ部12を一体に設けるので、周縁部の体積が増大している。しかし、コアレンズ部12の物体側の面12aとレンズ周面15とからなる角部16が面取りされて体積が削減されているので、レンズ10の中央部と周縁部との体積比が増大することが抑えられ、樹脂の収縮差が小さくなる。また、角部16を面取りすることで形成される面取り面16aがレンズ面11aからの入射光の光路と交叉しないので、入射光が面取り面16aで反射されて露光画面内に侵入することはない。したがって、レンズ10は、フレアの発生を抑えるために外径を大きく構成しながらも、射出成形後の樹脂の収縮によるレンズの撓みが抑えられ、レンズ面の面精度を高度に維持することができる。
【0015】
次に、図3ないし図5を参照して、本発明の樹脂成形レンズの第2実施形態について説明する。図3および図4に示すように、レンズ20は、レンズ面が凹状に形成される負レンズであり、樹脂により射出成形される。このレンズ20は、レンズ面21a,21b(図5参照)が形成された有効レンズ部21の外周にコアレンズ部22を設けた構成となっている。コアレンズ部22は、レンズ周面23での反射光の光量が、露光画面内に結像される被写体像のコントラストを低下させない程度となるように、放射方向の長さLが長く構成されている。
【0016】
コアレンズ部22には、横長に規定された露光画面24内に向かう光線が通過する有効光線通過範囲25の上辺および下辺と平行で、かつ有効レンズ部21の輪郭部に接する境界部26a,27aを根元とする上下一対の係止部26,27が設けられている。
【0017】
図5に示すように、レンズ20は、レンズ保持枠30に保持される。レンズ保持枠30には、レンズ20への入射光を規制するためのレンズ開口31が形成されており、このレンズ開口31の上部および下部に、レンズ保持枠30の内壁30a側に突出した一対の係止爪32,33が設けられている。レンズ20は、レンズ全体を撓ませて、係止爪32,33とレンズ保持枠30の内壁30bとの隙間に係止部26,27を嵌め込むことによって、レンズ開口31の背面に位置決め,固定される。なお、係止部26,27は、各々の厚さDc が有効レンズ部21の最外周部での厚さDe よりも薄くなるように形成されている。
【0018】
このレンズ20は、レンズ保持枠30に保持させると同時に、レンズ保持枠30内に固定され、従来のレンズのように押さえ部材の装着,かしめ加工,接着などの加工を施す必要がないので、組み付け作業が簡便になる。また、係止部26,27が、レンズ20の周縁から有効光線通過範囲25までの距離が最も長くなる有効光線通過範囲25の上下に規定されるので、係止部26,27を押さえる力が有効光線通過範囲25内に及ぶことはない。したがって、レンズ20は、レンズ面21a,21bの面状態が少なくとも有効光線通過範囲25内において良好に維持される。
【0019】
また、係止部26,27の厚さDc が有効レンズ部21の最外周部での厚さDe よりも薄く構成されているので、レンズ20は、中央部と周縁部との体積比が小さくなり、射出成形後の樹脂の収縮による撓みが防止される。これにより、レンズ面21a,21bの面状態が良好に維持される。
【0020】
なお、上記第2実施形態では、レンズ保持枠に係止爪を設け、この係止爪とレンズ保持枠の内壁との間にレンズの係止部を嵌め込むようにしたが、例えばレンズ保持枠の内壁に、レンズの外径とほぼ同じ距離だけ離間して対向する一対の溝を形成しておき、この溝内に係止部の縁部を嵌め込むようにしてもよい。この実施形態によれば、係止爪を突設する場合に比較してレンズ保持枠の形状が単純化されるので、その成形を容易に行うことができる。
【0021】
また、上記第2実施形態のレンズにおいても第1実施形態のレンズと同様に、コアレンズ部の物体側の面とレンズ周面とからなる角部を面取りすれば、レンズの周縁部の体積がさらに削減され、射出成形後のレンズの撓みを確実に防止することができる。
【0022】
【発明の効果】
以上のように、本発明の樹脂成形レンズによれば、レンズ面が形成された有効レンズ部の外周に一定量の余裕幅を持たせるためのコアレンズ部を設けたので、レンズ面とレンズ周面との距離長くなり、レンズ周面での反射光量が少なくなる。これにより、レンズ周面からの反射光によるフレアの発生が抑えられる。
【0023】
また、レンズ全体を撓ませて、周縁部上に対に設けた係止部をレンズ保持部材に設けた溝部に嵌め込むことで、レンズ保持部材内に固定するので、レンズはレンズ保持部材に保持されると同時に固定される。したがって、レンズの保持工程の他には何ら加工工程を必要としないので、レンズの組み付けを簡便に行うことができる。
【0024】
また、一対の係止部を、レンズの周縁から有効光線通過範囲までの距離が最も長くなる有効光線通過範囲の上下に設けることで、係止部に加わる押圧力が有効光線通過範囲内にまで及ぶことが防止される。これにより、レンズ面の面状態が、少なくとも有効光線通過範囲内において良好に維持される。
【図面の簡単な説明】
【図1】本発明の樹脂成形レンズの構成を示す断面図である。
【図2】図1に示した樹脂成形レンズの要部を示す概略図である。
【図3】本発明の樹脂成形レンズの別の構成を示す斜視図である。
【図4】図3に示した樹脂成形レンズの正面図である。
【図5】図3に示した樹脂成形レンズをレンズ保持枠に保持させた状態を示す断面図である。
【図6】従来の樹脂成形レンズの構成を示す断面図である。
【図7】図6に示したコアレンズ部の大きさとレンズ周面の入射光に対する反射面積との関係を示す説明図である。
【符号の説明】
5,10,20 レンズ
6,11,21 有効レンズ部
6a,6b,11a,11b,21a,21b レンズ面
7,12,22 コアレンズ部
8,15,23 レンズ周面
9,14,30 レンズ保持枠
16 角部
16a 面取り面
25 有効光線通過範囲
26,27 係止部
32,33 係止爪
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the shape of a photographic resin molded lens.
[0002]
[Prior art]
At present, a large number of types of cameras for photography are manufactured and sold depending on applications and functions. Recently, in order to be able to enjoy photography at any time, a film unit with a lens in which an unexposed photographic film is built in a unit body incorporating a photographing mechanism such as a photographing lens or a shutter device has been sold. . This lens-fitted photo film unit is widely used because it can be photographed immediately on the spot when it is purchased, and can be taken to a developing dealer as it is after photographing.
[0003]
In such a film unit with a lens and a low-price camera, a resin lens molded by an injection molding method is generally used as a photographing lens. The resin lens is positioned by being held by a lens holding member. Conventionally, when holding the lens on the lens holding member, the holding member is held on the lens holding member together with the lens, or a part of the lens holding member is caulked on the peripheral edge of the lens, or the lens and the lens holding member The gap between the lens and the lens holding member is eliminated by a method such as bonding the lens. As a result, the lens is prevented from rattling in the lens holding member, and the optical performance of the lens is maintained in a good state.
[0004]
By the way, it is known that a phenomenon called flare occurs when a photograph is taken in a place where there is a bright light source above, such as the sun or an indoor lamp. This phenomenon occurs because strong light such as sunlight is reflected by the peripheral surface of the photographic lens or the inner wall of the lens holding member, and stray light is given to a part or the entire surface of the photographic screen, reducing the contrast of the subject image. Let
[0005]
FIG. 6 shows a general configuration of a resin molded lens used as a photographing lens. The lens 5 has a configuration in which a core lens portion 7 is integrally provided on the outer periphery of the effective lens portion 6 on which the lens surfaces 6 a and 6 b are formed, and is positioned by holding the core lens portion 7 on the lens holding frame 9. The In such a lens 5, for example, as shown in FIG. 7, the length L in the radial direction of the core lens unit 7 is configured to be long, and the distance between the lens surfaces 6 a and 6 b and the lens peripheral surface 8 is increased. Flare phenomenon can be reduced. That is, as the length L increases, the area of the lens peripheral surface 8 that enters the optical path of the incident light decreases, so the amount of light reflected by the lens peripheral surface 8 and directed toward the photographing screen decreases. Generation of flare can be suppressed.
[0006]
[Problems to be solved by the invention]
However, when this method is used for a negative lens whose lens surface is formed in a concave shape, the volume of the peripheral portion of the lens increases, and the shrinkage rate of the resin after injection molding is large between the central portion and the peripheral portion of the lens. It makes a difference. For this reason, a lens surface becomes easy to bend after injection molding, and it becomes difficult to maintain the surface accuracy of a lens highly.
[0007]
Further, as described above, in order to fix the lens in the lens holding member, after the lens is held by the lens holding member, processing such as mounting, caulking, and bonding of the pressing member must be performed. For this reason, in the conventional lens, not only a lot of man-hours are required for assembling to the lens holding member, but also high assembling accuracy is required.
[0008]
The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a resin-molded lens that suppresses the occurrence of flare and can be easily assembled to a lens holding member without reducing the surface accuracy of the lens. And
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the resin-molded lens of the present invention is a resin-molded lens that is injection-molded with a resin and used in a state of being held by a lens holding member, on the outer periphery of an effective lens portion on which a lens surface is formed. A pair of latches provided with a core lens part for providing a certain amount of margin and having a peripheral edge part of the core lens part thinner than a thickness at an outermost peripheral part of the effective lens part. The lens is bent and the entire lens is bent, and the pair of locking portions are fitted into a pair of grooves provided in the lens holding member to be fixed to the lens holding member .
[0010]
The pair of locking portions are provided at an upper portion and a lower portion of an effective light beam passage range through which a light beam traveling in an exposure screen defined as horizontally long passes . Further, the pair of locking portions are those rays toward the exposure screen is provided on the outside of and opposed position of the effective light beam passing range to pass.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a first embodiment of a resin molded lens of the present invention. The lens 10 is a negative lens having a concave lens surface and is injection-molded with resin. The lens 10 has a configuration in which a core lens portion 12 is integrally provided on the outer periphery of an effective lens portion 11 formed with lens surfaces 11a and 11b. The core lens portion 12 is provided with a support portion 13 that protrudes stepwise outside the optical path of incident light at a position close to the effective lens portion 11. The lens 10 is positioned on the back side of the lens opening 14 a by bringing the support portion 13 into contact with the inner wall of the lens holding frame 14.
[0012]
Light incident at an acute angle with respect to the lens surface 11a on the object side is reflected by the lens peripheral surface 15 into an exposure screen (not shown), causing a flare phenomenon. However, as the length L in the radial direction of the core lens portion 12 increases, the area of the lens peripheral surface 15 that enters the optical path of incident light decreases, so the amount of reflected light into the exposure screen decreases. Therefore, the length L in the radial direction of the core lens unit 12 is determined so that the amount of reflected light on the lens peripheral surface 15 does not decrease the contrast of the subject image formed in the exposure screen. It is configured longer than usual.
[0013]
As shown in FIG. 2, the core lens portion 12 has a chamfered corner portion 16 composed of an object-side surface 12 a and a lens circumferential surface 15. The corner portion 16 is chamfered so as not to block the optical path of light incident from the lens surface 11a, and the chamfered surface 16a formed by chamfering and the optical path of incident light do not cross each other.
[0014]
In the lens 10 configured as described above, since the core lens portion 12 is integrally provided on the outer periphery of the effective lens portion 11, the volume of the peripheral portion is increased. However, since the corner 16 formed by the object-side surface 12a of the core lens portion 12 and the lens peripheral surface 15 is chamfered to reduce the volume, the volume ratio between the central portion and the peripheral portion of the lens 10 increases. And the difference in shrinkage of the resin is reduced. Further, since the chamfered surface 16a formed by chamfering the corner portion 16 does not intersect the optical path of the incident light from the lens surface 11a, the incident light is not reflected by the chamfered surface 16a and enters the exposure screen. . Therefore, the lens 10 is configured to have a large outer diameter in order to suppress the occurrence of flare, but the bending of the lens due to the shrinkage of the resin after injection molding can be suppressed, and the surface accuracy of the lens surface can be maintained at a high level. .
[0015]
Next, with reference to FIG. 3 thru | or FIG. 5, 2nd Embodiment of the resin molding lens of this invention is described. As shown in FIGS. 3 and 4, the lens 20 is a negative lens having a concave lens surface and is injection-molded with resin. This lens 20 has a configuration in which a core lens portion 22 is provided on the outer periphery of an effective lens portion 21 on which lens surfaces 21a and 21b (see FIG. 5) are formed. The core lens unit 22 is configured to have a long radial length L so that the amount of reflected light on the lens peripheral surface 23 does not decrease the contrast of the subject image formed in the exposure screen. Yes.
[0016]
The core lens portion 22 has boundary portions 26 a and 27 a that are parallel to the upper and lower sides of the effective light beam passing range 25 through which light rays traveling into the exposure screen 24 that is defined horizontally are passed and that are in contact with the contour portion of the effective lens portion 21. A pair of upper and lower locking portions 26, 27 having a root as a base is provided.
[0017]
As shown in FIG. 5, the lens 20 is held by the lens holding frame 30. The lens holding frame 30 is formed with a lens opening 31 for restricting light incident on the lens 20. A pair of upper and lower portions of the lens opening 31 project toward the inner wall 30 a of the lens holding frame 30. Locking claws 32 and 33 are provided. The lens 20 is positioned and fixed on the back surface of the lens opening 31 by bending the entire lens and fitting the locking portions 26 and 27 into the gap between the locking claws 32 and 33 and the inner wall 30b of the lens holding frame 30. Is done. The locking portions 26 and 27 are formed so that each thickness Dc is thinner than the thickness De at the outermost peripheral portion of the effective lens portion 21.
[0018]
The lens 20 is held in the lens holding frame 30 and is fixed in the lens holding frame 30, and it is not necessary to apply a pressing member, a caulking process, an adhesion process, or the like unlike a conventional lens. Work becomes simple. Moreover, since the latching | locking parts 26 and 27 are prescribed | regulated on the upper and lower sides of the effective light passage range 25 in which the distance from the periphery of the lens 20 to the effective beam passage range 25 becomes the longest, the force which presses the latching | locking parts 26 and 27 is suppressed It does not extend within the effective ray passing range 25. Therefore, in the lens 20, the surface states of the lens surfaces 21a and 21b are favorably maintained at least within the effective light beam passing range 25.
[0019]
Further, since the thickness Dc of the locking portions 26 and 27 is configured to be thinner than the thickness De at the outermost peripheral portion of the effective lens portion 21, the lens 20 has a small volume ratio between the central portion and the peripheral portion. Thus, bending due to shrinkage of the resin after injection molding is prevented. Thereby, the surface states of the lens surfaces 21a and 21b are favorably maintained.
[0020]
In the second embodiment, the lens holding frame is provided with a locking claw, and the lens locking portion is fitted between the locking claw and the inner wall of the lens holding frame. A pair of grooves facing each other at a distance substantially the same as the outer diameter of the lens may be formed on the inner wall of the lens, and the edge of the locking portion may be fitted into the groove. According to this embodiment, since the shape of the lens holding frame is simplified as compared with the case where the locking claw is protruded, the molding can be easily performed.
[0021]
Also in the lens of the second embodiment, similarly to the lens of the first embodiment, if the corner portion formed by the object side surface of the core lens portion and the lens peripheral surface is chamfered, the volume of the peripheral portion of the lens is increased. Further, the lens can be reliably prevented from being bent after injection molding.
[0022]
【The invention's effect】
As described above, according to the resin-molded lens of the present invention, since the core lens portion for providing a certain amount of margin width is provided on the outer periphery of the effective lens portion on which the lens surface is formed, the lens surface and the lens periphery are provided . The distance to the surface becomes longer, and the amount of reflected light on the lens peripheral surface decreases. Thereby, generation | occurrence | production of the flare by the reflected light from a lens surrounding surface is suppressed.
[0023]
Further, by bending the whole lenses, by fitting the engaging portion provided in pairs on the periphery in the groove provided on the lens holding member, since the fixed lens holding member, lenses are held lenses It is fixed at the same time it is held by the member. Therefore, since no processing step is required other than the lens holding step, the lens can be easily assembled.
[0024]
Further, by providing the pair of locking portions above and below the effective light beam passing range where the distance from the lens periphery to the effective light beam passing range is longest, the pressing force applied to the locking portion is within the effective light beam passing range. It is prevented from reaching. Thereby, the surface state of the lens surface is satisfactorily maintained at least within the effective light beam passing range.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a resin molded lens of the present invention.
FIG. 2 is a schematic view showing a main part of the resin molded lens shown in FIG. 1;
FIG. 3 is a perspective view showing another configuration of the resin-molded lens of the present invention.
4 is a front view of the resin molded lens shown in FIG. 3. FIG.
5 is a cross-sectional view showing a state where the resin molded lens shown in FIG. 3 is held by a lens holding frame.
FIG. 6 is a cross-sectional view showing a configuration of a conventional resin molded lens.
7 is an explanatory diagram showing the relationship between the size of the core lens portion shown in FIG. 6 and the reflection area of the lens peripheral surface with respect to incident light.
[Explanation of symbols]
5, 10, 20 Lens 6, 11, 21 Effective lens portion 6a, 6b, 11a, 11b, 21a, 21b Lens surface 7, 12, 22 Core lens portion 8, 15, 23 Lens peripheral surface 9, 14, 30 Lens holding Frame 16 Corner 16a Chamfered surface 25 Effective ray passing range 26, 27 Locking portion 32, 33 Locking claw

Claims (3)

樹脂により射出成形され、レンズ保持部材に保持させた状態で用いられる樹脂成形レンズにおいて
レンズ面が形成された有効レンズ部の外周に一定量の余裕幅を持たせるためのコアレンズ部が設けられているとともに、前記コアレンズ部の周縁部を前記有効レンズ部の最外周部での厚さよりも薄く構成してなる一対の係止部を備え、レンズ全体を撓ませて、前記一対の係止部を前記レンズ保持部材に設けた一対の溝部に嵌め込むことによってレンズ保持部材に固定することを特徴とする樹脂成形レンズ。
Injection molded by resin, the resin molded lens used in a state of being held by the lens holding member,
A core lens part for providing a certain amount of margin width is provided on the outer periphery of the effective lens part on which the lens surface is formed, and the peripheral part of the core lens part is arranged at the outermost peripheral part of the effective lens part. A pair of locking portions made thinner than the thickness are provided, the entire lens is bent, and the pair of locking portions are fitted into a pair of grooves provided in the lens holding member, and fixed to the lens holding member. A resin-molded lens.
前記一対の係止部は、横長に規定された露光画面内に向かう光線が通過する有効光線通過範囲の上部および下部に設けられることを特徴とする請求項記載の樹脂成形レンズ。The pair of engaging portions, Horizontal-defined resin molded lens according to claim 1, wherein the light beam towards the exposure screen is characterized in that it is provided in the upper and lower effective light passing range to pass. 前記一対の係止部は、露光画面内に向かう光線が通過する有効光線通過範囲の外側の相対向位置に設けられていることを特徴とする請求項記載の樹脂成形レンズ。The pair of engaging portions, the resin molded lens according to claim 1, wherein the light beam towards the exposure screen is provided on the outside of and opposed position of the effective light beam passing range to pass.
JP20623297A 1997-07-31 1997-07-31 Resin molded lens Expired - Lifetime JP4031847B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20623297A JP4031847B2 (en) 1997-07-31 1997-07-31 Resin molded lens

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Application Number Priority Date Filing Date Title
JP20623297A JP4031847B2 (en) 1997-07-31 1997-07-31 Resin molded lens

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Publication Number Publication Date
JPH1152108A JPH1152108A (en) 1999-02-26
JP4031847B2 true JP4031847B2 (en) 2008-01-09

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Publication number Priority date Publication date Assignee Title
JP4321078B2 (en) 2003-02-28 2009-08-26 コニカミノルタホールディングス株式会社 Molded lens
JP5921253B2 (en) * 2012-02-23 2016-05-24 キヤノン株式会社 Viewfinder device and imaging device using the same

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