JPH05264900A - Reading lens - Google Patents
Reading lensInfo
- Publication number
- JPH05264900A JPH05264900A JP8922992A JP8922992A JPH05264900A JP H05264900 A JPH05264900 A JP H05264900A JP 8922992 A JP8922992 A JP 8922992A JP 8922992 A JP8922992 A JP 8922992A JP H05264900 A JPH05264900 A JP H05264900A
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- Japan
- Prior art keywords
- lens
- object side
- positive
- reading
- angle
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はファクシミリ等に使用さ
れる読取用レンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading lens used in facsimiles and the like.
【０００２】[0002]
【従来の技術】ファクシミリ等に使用される読取用レン
ズは高い結像性能を要求されるのはもちろんであるが、
更に明るく、広画角で、構成レンズ枚数が少ないコンパ
クトなレンズであれば、装置の小型化、低コスト化にも
有利である。このような要求を満足するレンズタイプと
して従来から知られているものをあげれば、明るいレン
ズタイプとしては特開平１−９２７１１号公報記載のも
のがあげられる。これは４群５枚構成でＦ２．８〜Ｆ４
と明るく、画角は２２°で比較的広角である。しかし、
全長が０．７ｆ程度有り、コンパクト性に欠ける。また
特開平３−１８８４０５号公報記載のものも、Ｆ３と明
るいが画角は２０°程度とやや狭く、４群６枚構成で非
球面を使用しているので、コスト高となる。広画角なレ
ンズタイプとしては、特開昭６３−６５４１６号、特開
平２−２３０２０８号、特開平３−２４９７１９号、特
公平１−５０８８４号の各公報に記載されたレンズは、
４〜５枚構成で、いずれも画角３０°以上あり、非常に
広角である。しかし、明るさはＦ４〜４．６と暗い上
に、特開平２−２３０２０８号と特公平１−５０８８４
号公報記載のものはレンズ全長が１．０ｆもあり、非常
に大きなレンズである。コンパクトなレンズタイプとし
ては、特開平２−１３９５１４号、特開昭６３−２５６
１１号、特公平２−３８９２５号の各公報記載のレンズ
は、３〜４枚構成で、枚数も少なく、全長は０．５５ｆ
以下とコンパクトで、画角も２２°〜２５°あり広画角
である。しかし明るさはＦ４で、Ｆ４より明るくする
と、コマフレアーが増大するため、画面全体で高性能を
維持することが難しくなる。2. Description of the Related Art Needless to say, a reading lens used in a facsimile or the like is required to have high image forming performance.
A compact lens that is brighter, has a wide angle of view, and has a small number of constituent lenses is also advantageous in reducing the size and cost of the device. As a lens type that has hitherto been known as a lens type that satisfies such requirements, as a bright lens type, there is a lens type described in JP-A-1-92711. This consists of 5 elements in 4 groups, F2.8 to F4
It is bright and the angle of view is 22 °, which is a relatively wide angle. But,
It has a total length of about 0.7f and lacks compactness. The one disclosed in Japanese Patent Laid-Open No. 3-188405 is bright as F3 but has a slightly narrow angle of view of about 20 ° and uses an aspherical surface with a four-group, six-lens structure, resulting in high cost. As the wide-angle lens type, the lenses described in JP-A-63-65416, JP-A-2-230208, JP-A-3-249719, and JP-B-1-50884 are:
With 4 to 5 sheets, each has an angle of view of 30 ° or more, which is a very wide angle. However, the brightness is F4 to 4.6, which is dark, and in addition, it is disclosed in JP-A-2-230208 and JP-B-1-50884.
The lens disclosed in the publication has a total lens length of 1.0 f and is a very large lens. As a compact lens type, there are JP-A-2-139514 and JP-A-63-256.
The lenses described in Japanese Patent Publication No. 11 and Japanese Patent Publication No. 2-338925 are composed of three to four lenses, the number of lenses is small, and the total length is 0.55f.
It is compact as below and has a wide angle of view with an angle of view of 22 ° to 25 °. However, the brightness is F4, and when it is brighter than F4, the coma flare increases, and it becomes difficult to maintain high performance on the entire screen.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、Ｆ３．７と
明るく、画角２３°程度と比較的広角で、しかもコンパ
クトな読取用レンズを得ようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to obtain a compact reading lens which is bright as F3.7 and has a relatively wide angle of view of about 23 °.
【０００４】[0004]
【課題を解決するための手段】本発明の読取用レンズ
は、物体側から順に、物体側に凸面を向けた正メニスカ
スレンズからなる第１レンズ、両凹負レンズからなる第
２レンズ、正レンズからなる第３レンズ、正レンズから
なる第４レンズ、物体側に強い凹面を向けた負レンズの
第５レンズの５群５枚で構成され、以下の条件を満足す
ることを特徴とする。 ０．０２ｆ＜ｄ2＜０．０６ｆ （１） ０．０１ｆ＜ｄ8＜０．０６ｆ （２） ０．４ ｆ＜ｆ3＜１．２ｆ （３） （ｎ1＋ｎ3＋ｎ4）／３＞１．７６ （４） 但し、ｄi：第ｉ番目の軸上面間隔 ｎi：第ｉ番目のレンズのｅ線に対する屈折率 ｆi：第ｉ番目のレンズの焦点距離 ｆ ：全系の合成焦点距離A reading lens of the present invention comprises, in order from the object side, a first lens composed of a positive meniscus lens having a convex surface facing the object side, a second lens composed of a biconcave negative lens, and a positive lens. The third lens is composed of the third lens, the fourth lens is composed of a positive lens, and the fifth lens is composed of a fifth lens of a negative lens with a strong concave surface facing the object side. The following conditions are satisfied. 0.02f <d 2 <0.06f (1) 0.01f <d 8 <0.06f (2) 0.4 f <f 3 <1.2f (3) (n 1 + n 3 + n 4 ) / 3 > 1.76 (4) where di: i-th axial upper surface distance ni: refractive index of the i-th lens with respect to e-line fi: focal length of i-th lens f: combined focal length of entire system
【０００５】[0005]
【作用】本発明のレンズは、物体側より順に、正のメニ
スカスレンズ、負レンズ、正レンズ、負メニスカスレン
ズからなる５群５枚構成で、一般にテレフォトタイプと
呼ばれる屈折力配置をとる。このタイプのレンズは、レ
ンズ全長が短いうえに明るく、画角も広くとれるので、
コンパクトカメラ等の写真用レンズとして数多く使われ
ている。しかし、これらの写真用レンズをそのまま読取
用レンズとして使用した場合非点収差、歪曲収差の補正
が不充分であり、読取用レンズとして要求される高い性
能を得ることは難しい。本発明では、各レンズを適切な
パワーと空気間隔をもって配置することにより収差を良
好に補正している。具体的には、正の第１レンズと負の
第２レンズとの空気間隔及び正の第４レンズと負の第５
レンズとの空気間隔を小さく配置することにより第１レ
ンズ及び第４レンズで発生する収差があまり大きくなら
ないうちに第２レンズ及び第５レンズで補正している。
また第３レンズのパワーをあまり強くならないように配
置することにより全体としての収差補正を無理なく行な
えるようにしている。これを具体的に規定したのが条件
（１）ないし（４）である。条件（１）は像面湾曲を良
好に補正するための条件で、上限をこえると補正過剰に
下限をこえると補正不足となる。条件（２）の上限をこ
えると歪曲収差が正で大きくなると共に球面収差も補正
不足になりコントラストが低下するので、充分な性能が
得られなくなる。下限をこえると歪曲収差の補正には有
利になるが、球面収差が補正過剰になる。条件（３）の
上限をこえてパワーが弱くなりすぎると、非点隔差が増
大し、レンズ全長も大きくなってしまう。下限をこえる
とメリジオナル像面が負で大きくなり画面周辺部の性能
が劣化する。条件（４）は像面を平坦にするための条件
でこの範囲をこえると、ペッツバール和が増大し、像面
の平坦化が難しくなる。The lens of the present invention has a five-group, five-element configuration including a positive meniscus lens, a negative lens, a positive lens, and a negative meniscus lens in order from the object side, and has a refracting power arrangement generally called a telephoto type. This type of lens has a short overall length, is bright, and has a wide angle of view.
It is widely used as a photographic lens for compact cameras. However, when these photographic lenses are used as they are as reading lenses, the correction of astigmatism and distortion is insufficient, and it is difficult to obtain the high performance required as reading lenses. In the present invention, aberrations are satisfactorily corrected by arranging each lens with appropriate power and air gap. Specifically, the air gap between the positive first lens and the negative second lens, and the positive fourth lens and the negative fifth lens.
By arranging the air gap between the lenses to be small, the aberrations generated in the first lens and the fourth lens are corrected by the second lens and the fifth lens before they become too large.
Further, by arranging the third lens so that its power does not become too strong, aberration correction as a whole can be reasonably performed. The conditions (1) to (4) specifically define this. The condition (1) is a condition for satisfactorily correcting the field curvature. If the upper limit is exceeded, the correction is excessive, and if the lower limit is exceeded, the correction is insufficient. If the upper limit of the condition (2) is exceeded, the distortion will be positive and large, and the spherical aberration will be undercorrected and the contrast will be lowered, so that sufficient performance cannot be obtained. When the value goes below the lower limit, it is advantageous for correcting distortion, but spherical aberration is overcorrected. If the power exceeds the upper limit of the condition (3) and becomes too weak, the astigmatic difference increases and the total lens length also increases. If the value goes below the lower limit, the meridional image plane becomes negative and large, and the performance in the peripheral area of the screen deteriorates. The condition (4) is a condition for flattening the image surface, and if it exceeds this range, the Petzval sum increases, and it becomes difficult to flatten the image surface.
【０００６】[0006]
【実施例】以下、この発明の実施例を示す。なお、表中
の記号はｒは各屈折面の曲率半径、ｄは屈折面間隔、ｎ
はｅ線に対するレンズ材料の屈折率、νはレンズ材料の
アッベ数、ｆはレンズ全系の焦点距離、ＦはＦナンバ
ー、ωは半画角、Ｍは倍率を示す。EXAMPLES Examples of the present invention will be shown below. In the table, r is the radius of curvature of each refracting surface, d is the refracting surface interval, and n is
Is the refractive index of the lens material with respect to the e-line, ν is the Abbe number of the lens material, f is the focal length of the entire lens system, F is the F number, ω is the half angle of view, and M is the magnification.
【０００７】実施例１ ｆ＝２８．０４ Ｆ３．７ ω＝２３．５° Ｍ＝０．１３１ 面No. ｒ ｄ ｎ ν １ １０．１７２ ３．２０ １．８０８１１ ４６．６ ２ ２１．８２３ ０．９５ ３ −１４４．３７９ ０．７０ １．７６８５９ ２６．６ ４ １４．４６２ ２．６０ ５ １８．２８９ ２．２０ １．８０８１１ ４６．６ ６ １４０．５８８ ２．８０ ７ １３９．６７８ ２．４０ １．８１０７７ ４０．９ ８ −１３．１９５ ０．５５ ９ −８．６２３ ０．７０ １．５７０４７ ４２．８ １０ −９７１．７８９ ｄ2＝０．０３４ｆ ｄ8＝０．０２０ｆ ｆ3＝０．９２ｆ （ｎ1＋ｎ3＋ｎ4）／３＝１．８０９００ レンズ全長＝０．５７ｆExample 1 f = 28.04 F3.7 ω = 23.5 ° M = 0.131 Plane No. r d n ν 1 10.172 3.20 1.80811 46.6 2 21.823 0 .95 3 -144.379 0.70 1.76859 26.6 4 14.462 2.60 5 18.289 2.20 1.80811 46.6 6 140.588 2.80 7 139.678 2.40 1.81077 40.9 8 -13.195 0.55 9 -8.623 0.70 1.57047 42.8 10 -971.789 d 2 = 0.034f d 8 = 0.020f f 3 = 0. 92f (n 1 + n 3 + n 4 ) /3=1.80900 Total lens length = 0.57f
【０００８】実施例２ ｆ＝２８．１４ Ｆ３．７ ω＝２３．５° Ｍ＝０．１３１ 面No. ｒ ｄ ｎ ν １ ９．６３８ ３．１０ １．８３９４５ ４２．７ ２ １８．１５２ １．１０ ３ −４４．０８９ ０．７０ １．７３４２９ ２８．５ ４ １１．３２６ １．２０ ５ １９．７１７ ２．３０ １．８３９４５ ４２．７ ６ −３４．３２８ ２．６０ ７ −３２．１８１ ２．１０ １．８３９４５ ４２．７ ８ −１０．２８９ ０．５０ ９ −８．１８４ ０．７０ １．６７７６６ ３２．１ １０ −２９．１７０ ｄ2＝０．０３９ｆ ｄ8＝ ０．０１８ｆ ｆ3＝０．５４ｆ （ｎ1＋ｎ3＋ｎ4）／３＝１．８３９４５ レンズ全長＝０．５１ｆExample 2 f = 28.14 F3.7 ω = 23.5 ° M = 0.131 Surface No. r d n ν 1 9.638 3.10 1.83945 42.7 2 18.152 1 10 3-44.089 0.70 1.73429 28.5 4 11.326 1.20 5 19.717 2.30 1.83945 42.7 6-34.328 2.607 7-3.281 2 .10 1.83945 42.7 8 -10.289 0.50 9 -8.184 0.70 1.67766 32.1 10 -29.170 d 2 = 0.039f d 8 = 0.018f f 3 = 0.54f (n 1 + n 3 + n 4 ) /3=1.83945 Total lens length = 0.51f
【０００９】実施例３ ｆ＝３０．８９ Ｆ３．７ ω＝２３° Ｍ＝０．１２７ 面No. ｒ ｄ ｎ ν １ １１．１９４ ３．５０ １．８０８１１ ４６．６ ２ ２３．９６４ １．２０ ３ −１１８．７３５ ０．８０ １．７６８５９ ２６．６ ４ １６．１０７ ２．９０ ５ １６．３３７ ２．４０ １．６９９７９ ５５．５ ６ ７８．３８３ ３．１０ ７ ５８．３５４ ２．６０ １．８１０７７ ４０．９ ８ −１６．３５８ ０．９０ ９ −９．３０４ ０．８０ １．５７０４７ ４２．８ １０ ３９６．５５７ ｄ2＝０．０３９ｆ ｄ8＝０．０２９ｆ ｆ3＝０．９４ｆ （ｎ1＋ｎ3＋ｎ4）／３＝１．７７２８９ レンズ全長＝０．５９ｆExample 3 f = 30.89 F3.7 ω = 23 ° M = 0.127 Surface No. r d n ν 1 11.194 3.50 1.80811 46.6 2 23.964 1.20 3-118.735 0.80 1.76859 26.6 4 16.107 2.90 5 16.337 2.40 1.69979 55.5 6 78.383 3.10 7 58.354 2.60 1. 81077 40.9 8 -16.358 0.90 9 -9.304 0.80 1.57047 42.8 10 396.557 d 2 = 0.039f d 8 = 0.029f f 3 = 0.94f (n 1 + n 3 + n 4 ) /3=1.77289 Total lens length = 0.59f
【００１０】実施例４ ｆ＝３０．８８ Ｆ３．７ ω＝２３° Ｍ＝０．１２７ 面No. ｒ ｄ ｎ ν １ １０．３１１ ３．００ １．８０８１１ ４６．６ ２ １９．９７５ １．４５ ３ −２５４．２３５ ０．８０ １．７６８５９ ２６．６ ４ １３．４８２ ２．０５ ５ １４．３１９ ２．００ １．７７６２１ ４９．６ ６ ５０．６５６ ２．８０ ７ ７７．３８４ ３．８０ １．８１０７７ ４０．９ ８ −１５．２９６ ０．７０ ９ −８．６２４ １．５０ １．５７０４７ ４２．８ １０ −１１１．４７４ ｄ2＝ ０．０４７ｆ ｄ8＝ ０．０２３ｆ ｆ3＝ ０．８１ｆ （ｎ1＋ｎ3＋ｎ4）／３＝１．７９８３６ レンズ全長＝０．５９ｆExample 4 f = 30.88 F3.7 ω = 23 ° M = 0.127 Surface No. r d n ν 1 10.311 3.00 1.80811 46.6 2 19.975 1.45 3-254.235 0.80 1.76859 26.6 4 13.482 2.05 5 14.319 2.00 1.77621 49.6 6 50.656 2.80 7 77.384 3.80 1. 81077 40.9 8 -15.296 0.70 9 -8.624 1.50 1.57047 42.8 10 -111.474 d 2 = 0.047f d 8 = 0.023f f 3 = 0.81f ( n 1 + n 3 + n 4 ) /3=1.79836 Total lens length = 0.59f
【００１１】[0011]
【発明の効果】本発明の読み取り用レンズは、各実施例
およびその収差図に見るように、球面レンズのみで構成
され、Ｆ３．７、画角２３以上と明るく、広角であり、
しかもレンズ全長も０．６以下でありながら、諸収差が
よく補正され、低コストでコンパクトな読み取り用レン
ズを実現した。The reading lens of the present invention, as shown in each of the examples and its aberration diagram, is composed of only a spherical lens, is bright and has a wide angle at F3.7 and an angle of view of 23 or more.
Moreover, while the total lens length is 0.6 or less, various aberrations are well corrected, and a low-cost and compact reading lens is realized.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の読取用レンズの実施例１の断面図FIG. 1 is a sectional view of a first embodiment of a reading lens of the present invention.
【図２】上記実施例１の収差図FIG. 2 is an aberration diagram of Example 1 above.
【図３】実施例２の収差図FIG. 3 is an aberration diagram of Example 2.
【図４】実施例３の収差図FIG. 4 is an aberration diagram of Example 3.
【図５】実施例４の収差図であり、上記収差図はいずれ
も最終面と像面との間に厚さ０．７mmのカバーガラスを
配置した場合のものである。FIG. 5 is an aberration diagram of Example 4, and each of the above aberration diagrams is in the case where a cover glass having a thickness of 0.7 mm is arranged between the final surface and the image surface.
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【手続補正書】[Procedure amendment]
【提出日】平成４年１２月１４日[Submission date] December 14, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【図２】 [Fig. 2]
【図３】 [Figure 3]
【図４】 [Figure 4]
【図５】 [Figure 5]
Claims (1)
正メニスカスレンズからなる第１レンズ、両凹負レンズ
からなる第２レンズ、正レンズからなる第３レンズ、正
レンズからなる第４レンズ、物体側に強い凹面を向けた
負レンズの第５レンズの５群５枚で構成され、以下の条
件を満足することを特徴とする読取用レンズ ０．０２ｆ＜ｄ2＜０．０６ｆ ０．０１ｆ＜ｄ8＜０．０６ｆ ０．４ ｆ＜ｆ3＜１．２ｆ （ｎ1＋ｎ3＋ｎ4）／３＞１．７６ 但し、ｄi：第ｉ番目の軸上面間隔 ｎi：第ｉ番目のレンズのｅ線に対する屈折率 ｆi：第ｉ番目のレンズの焦点距離 ｆ ：全系の合成焦点距離1. A first lens composed of a positive meniscus lens having a convex surface facing the object side, a second lens composed of a biconcave negative lens, a third lens composed of a positive lens, and a fourth lens composed of a positive lens in order from the object side. A lens for reading, which is composed of 5 elements in 5 groups of 5th negative lens having a strong concave surface facing the object side, and which satisfies the following conditions: 0.02f <d 2 <0.06f 0 .01f <d 8 <0.06f 0.4 f <f 3 <1.2f (n 1 + n 3 + n 4 ) / 3> 1.76 where di: i-th axial upper surface interval ni: i-th Refractive index of the second lens with respect to the e-line fi: Focal length of the i-th lens f: Composite focal length of the entire system
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8922992A JPH05264900A (en) | 1992-03-16 | 1992-03-16 | Reading lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8922992A JPH05264900A (en) | 1992-03-16 | 1992-03-16 | Reading lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05264900A true JPH05264900A (en) | 1993-10-15 |
Family
ID=13964920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8922992A Withdrawn JPH05264900A (en) | 1992-03-16 | 1992-03-16 | Reading lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05264900A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6999246B2 (en) | 2004-02-18 | 2006-02-14 | Fujinon Corporation | Image scanning lens and image scanning device that uses same |
| JP2010224521A (en) * | 2009-02-27 | 2010-10-07 | Konica Minolta Opto Inc | Imaging lens, imaging device, and mobile terminal |
| JP2012145839A (en) * | 2011-01-13 | 2012-08-02 | Ricoh Co Ltd | Reading lens, image reader and image forming apparatus |
| JP2013156457A (en) * | 2012-01-30 | 2013-08-15 | Konica Minolta Inc | Imaging lens, imaging device and portable terminal |
| WO2013175782A1 (en) * | 2012-05-24 | 2013-11-28 | 富士フイルム株式会社 | Image pickup lens, and image pickup apparatus provided with image pickup lens |
| US11988817B2 (en) | 2017-02-08 | 2024-05-21 | Largan Precision Co., Ltd. | Optical imaging system, imaging apparatus and electronic device |
-
1992
- 1992-03-16 JP JP8922992A patent/JPH05264900A/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6999246B2 (en) | 2004-02-18 | 2006-02-14 | Fujinon Corporation | Image scanning lens and image scanning device that uses same |
| JP2010224521A (en) * | 2009-02-27 | 2010-10-07 | Konica Minolta Opto Inc | Imaging lens, imaging device, and mobile terminal |
| JP2013225159A (en) * | 2009-02-27 | 2013-10-31 | Konica Minolta Inc | Imaging lens, imaging apparatus and portable terminal |
| US8654241B2 (en) | 2009-02-27 | 2014-02-18 | Konica Minolta Opto, Inc. | Image pickup lens, image pickup apparatus, and mobile terminal |
| US8724005B2 (en) | 2009-02-27 | 2014-05-13 | Konica Minolta Opto, Inc. | Image pickup lens, image pickup apparatus, and mobile terminal |
| JP2012145839A (en) * | 2011-01-13 | 2012-08-02 | Ricoh Co Ltd | Reading lens, image reader and image forming apparatus |
| JP2013156457A (en) * | 2012-01-30 | 2013-08-15 | Konica Minolta Inc | Imaging lens, imaging device and portable terminal |
| WO2013175782A1 (en) * | 2012-05-24 | 2013-11-28 | 富士フイルム株式会社 | Image pickup lens, and image pickup apparatus provided with image pickup lens |
| CN104395806A (en) * | 2012-05-24 | 2015-03-04 | 富士胶片株式会社 | Image pickup lens, and image pickup apparatus provided with image pickup lens |
| US9170403B2 (en) | 2012-05-24 | 2015-10-27 | Fujifilm Corporation | Imaging lens and imaging apparatus equipped with the imaging lens |
| CN104395806B (en) * | 2012-05-24 | 2017-06-30 | 富士胶片株式会社 | Pick-up lens and possesses the camera head of the pick-up lens |
| US11988817B2 (en) | 2017-02-08 | 2024-05-21 | Largan Precision Co., Ltd. | Optical imaging system, imaging apparatus and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |