JPH0727974A - Lens for reading color original - Google Patents
Lens for reading color originalInfo
- Publication number
- JPH0727974A JPH0727974A JP20399593A JP20399593A JPH0727974A JP H0727974 A JPH0727974 A JP H0727974A JP 20399593 A JP20399593 A JP 20399593A JP 20399593 A JP20399593 A JP 20399593A JP H0727974 A JPH0727974 A JP H0727974A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- color original
- groups
- reading
- 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
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Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明はカラー原稿読取用レン
ズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color original reading lens.
【0002】[0002]
【従来の技術】原稿を固体撮像素子により信号化する
「原稿読取り」は、従来からファクシミリ装置やデジタ
ル複写機等において広く行われている。近来、これら装
置の小型・低価格化が意図されるに伴い、原稿読取りに
用いられる原稿読取用レンズも小型・低価格のものが求
められている。2. Description of the Related Art "Original reading" in which an original is converted into a signal by a solid-state image pickup device has been widely used in a facsimile apparatus, a digital copying machine and the like. Recently, with the intention of reducing the size and cost of these devices, a document reading lens used for reading documents is also required to be small and inexpensive.
【0003】また、カラー原稿を色分解して読取るの
に、赤・緑・青のフィルタを持った固体撮像素子を1チ
ップ上に3ライン併設した「3ライン1チップCCD」
が一般に用いられるが、このような素子でカラー原稿の
読取りを行うには、原稿読取用レンズの色収差を良好に
補正し、赤・緑・青の各光の最良の結像面を素子受光面
に一致させねばならない。Also, for color-separating and reading a color original, a "three-line one-chip CCD" is provided in which three lines of solid-state image pickup devices having red, green, and blue filters are provided on one chip.
However, in order to read a color original with such an element, the chromatic aberration of the original reading lens should be corrected well, and the best image plane of red, green, and blue light should be the element light receiving surface. Must match.
【0004】レンズ系の小型化・低コスト化に有効な
「トリプレット型」で構成した原稿読取用レンズとし
て、例えば、特開平4−255814号公報記載のもの
が知られているが、このレンズは色収差に就いて考慮さ
れておらず、従ってカラー原稿の読取りには適していな
い。As a document reading lens composed of a "triplet type" which is effective for downsizing and cost reduction of a lens system, for example, the one described in JP-A-4-255814 is known. Chromatic aberration is not taken into consideration, and therefore it is not suitable for reading color originals.
【0005】[0005]
【発明が解決しようとする課題】この発明は、上述した
事情に鑑みてなされたものであって、小型・低価格で色
収差を良好に補正した新規なカラー原稿読取用レンズの
提供を目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a new color original reading lens which is small in size and low in price and satisfactorily corrects chromatic aberration. .
【0006】[0006]
【課題を解決するための手段】請求項1記載のカラー原
稿読取用レンズは、図1に示すようにトリプレット型で
あって、物体側から像側へ向かって順次、第1群1ない
し第3群3を配してなり、第1群1と第2群2との間に
絞り4を有する。第1群1は凸面を物体側に向けた凸メ
ニスカスレンズ、第2群2は両凹レンズ、第3群3は両
凸レンズである。 第1群1の焦点距離:f1、第2群2の焦点距離:f2、
全系の焦点距離(合成焦点距離):f、第j群(j=1
〜3)の材質の屈折率:Nj、アッベ数:νjは、条件 (1) 0.83<f1/f<0.88 (2) 0.30<|f2/f|<0.33 (3) 0.10<{(N1+N3)/2}−N2<
0.13 (4) 16<{(ν1+ν3)/2}−ν2<18 を満足する。但し、上記f1,f2,f,Nj,νjは、全
て「e線」に対する値である。A lens for reading a color original according to claim 1 is a triplet type as shown in FIG. 1, and the first group 1 to the third group are sequentially arranged from the object side to the image side. A group 3 is arranged, and a diaphragm 4 is provided between the first group 1 and the second group 2. The first group 1 is a convex meniscus lens having a convex surface facing the object side, the second group 2 is a biconcave lens, and the third group 3 is a biconvex lens. The focal length of the first group 1 is f 1 , the focal length of the second group 2 is f 2 ,
Focal length of the whole system (composite focal length): f, j-th group (j = 1
To 3), the refractive index of the material: N j , the Abbe's number: ν j are as follows: Condition (1) 0.83 <f 1 /f<0.88 (2) 0.30 <| f 2 / f | <0 .33 (3) 0.10 <{( N 1 + N 3) / 2} -N 2 <
0.13 (4) 16 <{(ν 1 + ν 3 ) / 2} −ν 2 <18 is satisfied. However, the above f 1 , f 2 , f, N j , and ν j are all values for the “e line”.
【0007】上記請求項1記載のカラー原稿読取用レン
ズにおいては、レンズ系全長:dTと、e線に対する全
系の合成焦点距離:fとが、条件 (5) 0.25<dT/f<0.26 を満足することが好ましい(請求項2)。In the lens for reading a color original according to claim 1, the total length of the lens system: d T and the combined focal length of the entire system with respect to the e-line: f satisfy the condition (5) 0.25 <d T / It is preferable that f <0.26 is satisfied (claim 2).
【0008】請求項3記載のカラー原稿読取用レンズ
は、図2に示すようにトリプレット型であって、物体側
から像側へ向かって順次、第1群1ないし第3群3を配
してなり、第2群2と第3群3との間に絞り4を有す
る。第1群1は凸面を物体側に向けた凸メニスカスレン
ズ、第2群2は両凹レンズ、第3群3は両凸レンズであ
る。第1群1の焦点距離,第2群2の焦点距離,全系の
合成焦点距離,第j群の材質の屈折率,アッベ数を、請
求項1におけると同じく、「e線」に対し、それぞれf
1,f2,f,Nj,νjとすると、これらは、条件 (1’) 0.93<f1/f<1.06 (2’) 0.28<|f2/f|<0.32 (3’) 0.11<{(N1+N3)/2}−N2
<0.13 (4’) 15<{(ν1+ν3)/2}−ν2<1
8 を満足する。A color original reading lens according to a third aspect is a triplet type as shown in FIG. 2, wherein the first group 1 to the third group 3 are sequentially arranged from the object side to the image side. Therefore, the diaphragm 4 is provided between the second group 2 and the third group 3. The first group 1 is a convex meniscus lens having a convex surface facing the object side, the second group 2 is a biconcave lens, and the third group 3 is a biconvex lens. The focal length of the first lens group 1, the focal length of the second lens group 2, the combined focal length of the entire system, the refractive index of the material of the j-th lens group, and the Abbe's number are the same as those in claim 1, with respect to the "e line". F respectively
Assuming 1 , f 2 , f, N j , and ν j , these are conditions (1 ′) 0.93 <f 1 /f<1.06 (2 ′) 0.28 <| f 2 / f | < 0.32 (3 ') 0.11 <{ (N 1 + N 3) / 2} -N 2
<0.13 (4 ′) 15 <{(ν 1 + ν 3 ) / 2} −ν 2 <1
8 is satisfied.
【0009】請求項3記載のカラー原稿読取用レンズに
おいては、レンズ系全長:dTと、e線に対する全系の
合成焦点距離:fとが、条件 (5’) 0.23<dT/f<0.27 を満足することが好ましい。In the lens for reading a color original according to a third aspect of the present invention, the total length of the lens system: d T and the combined focal length of the entire system with respect to the e-line: f satisfy the condition (5 ′) 0.23 <d T / It is preferable to satisfy f <0.27.
【0010】なお、図1,2において、符号Aは原稿載
置ガラス、符号Bは固体撮像素子の受光面上のカバーガ
ラスを示す。In FIGS. 1 and 2, reference numeral A indicates a document mounting glass, and reference numeral B indicates a cover glass on the light receiving surface of the solid-state image pickup device.
【0011】[0011]
【作用】この発明のカラー原稿読取用レンズは、上記の
ように、3群3枚の「トリプレット型」である。請求項
1,2記載のカラー原稿読取用レンズと、請求項3,4
記載のカラー原稿読取用レンズとは「絞り」の位置が互
いに異なり、この違いに応じて、各条件式におけるパラ
メータ:f1/f,|f2/f|,{(N1+N3)/2}
−N2,{(ν1+ν3)/2}−ν2,dT/fの範囲が
若干異なったものとなっている。As described above, the color original reading lens of the present invention is a "triplet type" of three elements in three groups. A color original reading lens according to any one of claims 1 and 2;
The position of the “aperture” is different from that of the color original reading lens described above, and parameters in each conditional expression: f 1 / f, | f 2 / f |, {(N 1 + N 3 ) / 2}
The ranges of −N 2 , {(ν 1 + ν 3 ) / 2} −ν 2 , d T / f are slightly different.
【0012】条件(1),(1’)は、請求項1,3記
載のカラー原稿読取用レンズのそれぞれにおいて「第1
群のパワーを定める条件」であり、これら条件の上限を
超えると、第1群の正のパワーが小さくなり過ぎるた
め、レンズ全長が大きくなり原稿読取装置の小型化の要
請に沿うことが困難になる。逆に下限を超えると、第1
群の正のパワーが大きくなり、レンズ全長のコンパクト
化には有利であるが、歪曲収差・コマ収差が悪化し、収
差補正が困難となる。The conditions (1) and (1 ') are "first" in each of the color document reading lenses described in claims 1 and 3.
If the upper limit of these conditions is exceeded, the positive power of the first group becomes too small, and the total lens length becomes large, making it difficult to meet the demand for downsizing of the document reading device. Become. Conversely, if the lower limit is exceeded, the first
The positive power of the lens group becomes large, which is advantageous for making the overall lens length compact, but distortion and coma become worse, and aberration correction becomes difficult.
【0013】条件(2),(2’)は、請求項1,3記
載のカラー原稿読取用レンズのそれぞれにおいて「第2
群のパワーを定める条件」であり、これら条件の上限を
超えると、第2群の負のパワーが小さくなり過ぎるため
ペッツバール和が大きくなって非点収差の補正が困難に
なる。下限を超えると、各レンズのパワーが大きくなっ
て高次収差が発生し易くなり、コマ収差が発生する。The conditions (2) and (2 ') are "second" in each of the color document reading lenses described in claims 1 and 3.
It is a condition that determines the power of the lens group. ”If the upper limits of these conditions are exceeded, the negative power of the second lens group becomes too small, and the Petzval sum becomes large, making it difficult to correct astigmatism. When the value goes below the lower limit, the power of each lens becomes large, and high-order aberrations easily occur, and coma occurs.
【0014】条件(3),(3’)は、請求項1,3記
載のカラー原稿読取用レンズのそれぞれにおいて「凸・
凹レンズの屈折率の関係を定める条件」であり、これら
条件の上限を超えると、ペッツバール和が小さくなり過
ぎ、像面が正の側に倒れて像面湾曲が大きくなる。下限
を超えると、ペッツバール和が大きくなり過ぎ、像面が
負の側に倒れ、非点隔差が大きくなり。従って、条件
(3),(3’)の範囲外では全面各にわたって良好な
性能を得ることができない。The conditions (3) and (3 ') are "convex / convex" in each of the color document reading lenses described in claims 1 and 3.
It is a condition for defining the relationship of the refractive index of the concave lens ", and if the upper limits of these conditions are exceeded, the Petzval sum becomes too small, the image surface falls to the positive side, and the curvature of field becomes large. If the value goes below the lower limit, the Petzval sum will become too large, the image surface will fall to the negative side, and the astigmatic difference will become large. Therefore, outside the ranges of the conditions (3) and (3 ′), good performance cannot be obtained over the entire surface.
【0015】条件(4),(4’)は、請求項1,3記
載のカラー原稿読取用レンズのそれぞれにおいて「色収
差を良好に補正するための条件」であって、上限を超え
ると軸上の色収差が補正過剰となり、主波長に対して短
波長側の軸上の色収差が正で大きくなる。また下限を超
えると、主波長に対して短波長側の軸上の色収差が負で
大きくなる。The conditions (4) and (4 ') are "conditions for satisfactorily correcting chromatic aberration" in each of the color document reading lenses according to claims 1 and 3, and if the upper limit is exceeded, the condition is axial. Is overcorrected and the axial chromatic aberration on the short wavelength side with respect to the main wavelength is positive and large. On the other hand, when the value goes below the lower limit, the axial chromatic aberration on the short wavelength side with respect to the dominant wavelength becomes negative and increases.
【0016】条件(5),(5’)は、請求項1,3記
載の各カラー原稿読取用レンズに対する付加的な条件で
あり、請求項1,3記載の各カラー原稿読取用レンズは
それぞれ条件(5),(5’)を満足することが好まし
い。The conditions (5) and (5 ') are additional conditions to the color original reading lenses described in claims 1 and 3, and the color original reading lenses described in claims 1 and 3 are respectively defined. It is preferable to satisfy the conditions (5) and (5 ′).
【0017】即ち、条件(5),(5’)は全長に関す
る条件であって、これらの条件を満足することにより、
請求項1,3記載の各カラー原稿読取用レンズの特徴を
活かしつつ、さらに収差を良好に補正して全長のコンパ
クト化が可能となる。That is, the conditions (5) and (5 ') are conditions relating to the total length, and by satisfying these conditions,
While making full use of the features of the respective color document reading lenses described in claims 1 and 3, it is possible to further correct aberrations and make the entire length compact.
【0018】[0018]
【実施例】以下、具体的な実施例を挙げる。EXAMPLES Specific examples will be given below.
【0019】図1および2に示すように、物体側から数
えて第i番目のレンズ面およびカバーガラスBの各面の
曲率半径をri(i=1〜8)とし、物体側から数えて
第i番目の面と第i+1番目の面の光軸上の面間隔をd
i(i=1〜7)とする。また、第j群(J=j〜3)
の材質のe線に対する屈折率とアッベ数をNj,νj、カ
バーガラスBの屈折率とアッベ数を上記サフィックスj
=4としてN4,ν4と表示する。さらに、全系の合成焦
点距離をf(単位:mm)、明るさをF/No、倍率を
m、半画角をω(単位:度)、物体高をY(単位:m
m)で表す。なお、原稿載置ガラスAはレンズ性能に影
響しないので元の記載を省略する。As shown in FIGS. 1 and 2, the radii of curvature of the ith lens surface and each surface of the cover glass B counted from the object side are r i (i = 1 to 8) and counted from the object side. The surface distance on the optical axis between the i-th surface and the (i + 1) th surface is d
i (i = 1 to 7). Also, the j-th group (J = j to 3)
The refractive index and Abbe number of the material of the above for e-line are N j and ν j , and the refractive index and Abbe number of the cover glass B are the above suffix j
= 4, and N 4 and ν 4 are displayed. Further, the combined focal length of the entire system is f (unit: mm), the brightness is F / No, the magnification is m, the half angle of view is ω (unit: degree), and the object height is Y (unit: m).
It is represented by m). Since the original placing glass A does not affect the lens performance, the original description is omitted.
【0020】実施例1 f=78.3,F/No=5.6,m=0.22,ω=
19.2,Y=152.4 i ri di j Nj νj 1 24.363 10.000 1 1.77621 49.62 2 36.757 1.412 3 −40.593 1.0 2 1.67765 32.17 4 27.314 1.890 5 55.614 6.006 3 1.79195 47.49 6 −34.893 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ 絞りの位置:第2レンズ面の像側 0.911mmの位
置。Example 1 f = 78.3, F / No = 5.6, m = 0.22, ω =
19.2, Y = 152.4 i r i d i j N j v j 1 24.363 10.000 1 1.77621 49.62 2 36.757 1.412 3 -40.593 1.0 2 1 .67765 32.17 4 27.314 1.890 5 55.614 6.006 3 1.79195 47.49 6 −34.893 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ Aperture Position: Position of 0.911 mm on the image side of the second lens surface.
【0021】条件値の値 f1/f=0.879,|f2/f|=0.307,{(N
1+N3)/2}−N2=0.106,{(ν1+ν3)/2}−
ν2=16.4 dT/f=0.259
。Condition value f 1 /f=0.879, | f 2 /f|=0.307, {(N
1 + N 3 ) / 2} -N 2 = 0.106, {(ν 1 + ν 3 ) / 2}-
ν 2 = 16.4 d T /f=0.259
.
【0022】実施例2 f=78.3,F/No=5.6,m=0.22,ω=
19.2,Y=152.4 i ri di j Nj νj 1 24.143 10.000 1 1.75844 52.30 2 38.631 1.702 3 −41.369 1.0 2 1.63923 32.48 4 26.499 2.445 5 59.329 4.803 3 1.76066 48.67 6 −35.371 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ 絞りの位置:第2レンズ面の像側 1.209mmの位
置。Example 2 f = 78.3, F / No = 5.6, m = 0.22, ω =
19.2, Y = 152.4 i r i d i j N j ν j 1 24.143 10.000 1 1.75844 52.30 2 38.631 1.702 3 -41.369 1.0 2 1 .63923 32.48 4 26.499 2.445 5 59.329 4.803 3 1.76066 48.67 6 -35.371 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ Position: Position of 1.209 mm on the image side of the second lens surface.
【0023】条件値の値 f1/f=0.835,|f2/f|=0.321,{(N
1+N3)/2}−N2=0.120,{(ν1+ν3)/2}−
ν2=18.0dT/f=0.255
。Condition value f 1 /f=0.835, | f 2 /f|=0.321, {(N
1 + N 3 ) / 2} -N 2 = 0.120, {(ν 1 + ν 3 ) / 2}-
ν 2 = 18.0 d T /f=0.255
.
【0024】以上、実施例1,2は請求項1,2記載の
カラー原稿読取用レンズの実施例である。As described above, Examples 1 and 2 are examples of the color original reading lens according to the first and second aspects.
【0025】実施例3 f=78.3,F/No=5.6,m=0.22,ω=
19.1,Y=152.4 i ri di j Nj νj 1 23.389 10.000 1 1.71615 53.94 2 34.573 1.374 3 −39.618 1.0 2 1.62270 34.06 4 25.523 1.795 5 49.495 6.232 3 1.77621 49.62 6 −36.344 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ 絞りの位置:第4レンズ面の像側 0.857mmの位
置。Example 3 f = 78.3, F / No = 5.6, m = 0.22, ω =
19.1, Y = 152.4 i r i d i j N j ν j 1 23.389 10.000 1 1.71615 53.94 2 34.573 1.374 3 −39.618 1.0 21 .62270 34.06 4 25.523 1.795 5 49.495 6.232 3 1.77621 49.62 6 -36.344 86.4 7 ∞ 1.0 4 1.51633 64.148 ∞ Position: 0.857 mm position on the image side of the fourth lens surface.
【0026】条件値の値 f1/f=0.939,|f2/f|=0.316,{(N
1+N3)/2}−N2=0.123,{(ν1+ν3)/2}−
ν2=17.7 dT/f=0.261
。Condition value f 1 /f=0.939, | f 2 /f|=0.316, {(N
1 + N 3 ) / 2} -N 2 = 0.123, {(ν 1 + ν 3 ) / 2}-
ν 2 = 17.7 d T /f=0.261
.
【0027】実施例4 f=78.3,F/No=5.6,m=0.22,ω=
19.2,Y=152.4 i ri di j Nj νj 1 23.599 8.96 1 1.73742 51.05 2 32.339 1.572 3 −32.486 1.0 2 1.65223 33.84 4 26.822 1.185 5 45.619 5.827 3 1.79195 47.49 6 −31.292 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ 絞りの位置:第4レンズ面の像側 0.871mmの位
置。Example 4 f = 78.3, F / No = 5.6, m = 0.22, ω =
19.2, Y = 152.4 i r i d i j N j ν j 1 23.599 8.96 1 1.73742 51.05 2 32.339 1.572 3 -32.486 1.0 21 .65223 33.84 4 26.822 1.185 5 45.619 5.827 3 1.79195 47.49 6 -31.292 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ Position: A position of 0.871 mm on the image side of the fourth lens surface.
【0028】条件値の値 f1/f=1.054,|f2/f|=0.286,{(N
1+N3)/2}−N2=0.112,{(ν1+ν3)/2}−
ν2=15.4 dT/f=0.237
。Value of condition value f 1 /f=1.054, | f 2 /f|=0.286, {(N
1 + N 3 ) / 2} -N 2 = 0.112, {(ν 1 + ν 3 ) / 2}-
ν 2 = 15.4 d T /f=0.237
.
【0029】実施例5 f=78.3,F/No=5.6,m=0.22,ω=
19.4,Y=152.4 i ri di j Nj νj 1 23.349 8.85 1 1.73739 51.49 2 31.996 1.580 3 −32.965 1.0 2 1.65223 33.8 4 26.575 1.21 5 45.460 5.8 3 1.79196 47.38 6 −31.600 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ 絞りの位置:第4レンズ面の像側 0.871mmの位
置。Example 5 f = 78.3, F / No = 5.6, m = 0.22, ω =
19.4, Y = 152.4 i r i d i j N j ν j 1 23.349 8.85 1 1.73739 51.49 2 31.996 1.580 3 −32.965 1.0 21 .65223 33.8 4 26.575 1.21 5 45.460 5.8 3 1.79196 47.38 6 -31.600 86.4 7 ∞ 1.0 4 1.51633 64.14 8 ∞ Position: A position of 0.871 mm on the image side of the fourth lens surface.
【0030】条件値の値 f1/f=1.043,|f2/f|=0.286,{(N
1+N3)/2}−N2=0.112,{(ν1+ν3)/2}−
ν2=15.6 dT/f=0.236
。Value of condition value f 1 /f=1.043, | f 2 /f|=0.286, {(N
1 + N 3 ) / 2} -N 2 = 0.112, {(ν 1 + ν 3 ) / 2}-
ν 2 = 15.6 d T /f=0.236
.
【0031】以上、実施例3〜5は請求項3,4記載の
カラー原稿読取用レンズの実施例である。As described above, Embodiments 3 to 5 are embodiments of the color original reading lens described in claims 3 and 4.
【0032】図3〜図7に順次、上記実施例1〜5に関
する収差図を示す。これら収差図において、は
それぞれ、e線(波長:546.07nm),C線(波
長:656.27nm),F線(波長:486.13n
m),g線(波長:435.83nm)に関するもので
あることを示す。また非点収差の図における実線はサジ
タル光線、破線はメリディオナル光線を示す。FIG. 3 to FIG. 7 sequentially show aberration diagrams of the above Examples 1 to 5. In these aberration diagrams, are respectively e-line (wavelength: 546.07 nm), C-line (wavelength: 656.27 nm), F-line (wavelength: 486.13n).
m) and g-line (wavelength: 435.83 nm). The solid line in the diagram of astigmatism indicates the sagittal ray, and the broken line indicates the meridional ray.
【0033】各実施例とも色収差が良好に補正され、軸
上・軸外の収差バランスが良く、開口効率が略100%
であるにも拘らず、コマフレアも小さく、コマ収差が良
好で高いコントラストを有している。In each of the examples, the chromatic aberration is corrected well, the on-axis and off-axis aberrations are well balanced, and the aperture efficiency is about 100%.
However, the coma flare is small, the coma aberration is good, and the contrast is high.
【0034】[0034]
【発明の効果】以上説明したように、この発明によれば
新規なカラー原稿読取用レンズを提供できる。このレン
ズは3群3枚構成と構成枚数が少ないため小型・安価に
実現でき、しかも色収差が良好に補正され、性能良好で
あるから3ライン1チップCCDを用いるカラー原稿読
取装置に好適に利用できる。As described above, according to the present invention, a novel color original reading lens can be provided. This lens can be realized in a small size and at a low cost because it is composed of 3 elements in 3 groups and the number of constituent elements is small, and in addition, chromatic aberration is well corrected and performance is good, so that it can be suitably used for a color original reading apparatus using a 3 line 1 chip CCD. .
【図1】請求項1,2記載のカラー原稿読取用レンズの
レンズ構成を示す図である。FIG. 1 is a diagram showing a lens configuration of a color original reading lens according to claims 1 and 2;
【図2】請求項3,4記載のカラー原稿読取用レンズの
レンズ構成を示す図である。FIG. 2 is a diagram showing a lens configuration of a color original reading lens according to claims 3 and 4;
【図3】実施例1に関する収差図である。FIG. 3 is an aberration diagram for Example 1.
【図4】実施例2に関する収差図である。FIG. 4 is an aberration diagram for Example 2.
【図5】実施例3に関する収差図である。FIG. 5 is an aberration diagram for Example 3.
【図6】実施例4に関する収差図である。FIG. 6 is an aberration diagram for Example 4.
【図7】実施例5に関する収差図である。FIG. 7 is an aberration diagram for Example 5.
1 第1群の凸メニスカスレンズ 2 第2群の両凹レンズ 3 第3群の両凸レンズ 4 絞り 1 Convex meniscus lens of 1st group 2 Biconcave lens of 2nd group 3 Biconvex lens of 3rd group 4 Aperture
Claims (4)
し第3群を配してなり、第1,第2群間に絞りを有する
3群3枚構成であり、 第1群は凸面を物体側に向けた凸メニスカスレンズ、 第2群は両凹レンズ、 第3群は両凸レンズであって、 e線に対する、全系及び第1,第2群の焦点距離:f,
f1,f2、第j群(j=1〜3)の材質の屈折率:
Nj,アッベ数:νjが、条件 (1) 0.83<f1/f<0.88 (2) 0.30<|f2/f|<0.33 (3) 0.10<{(N1+N3)/2}−N2<
0.13 (4) 16<{(ν1+ν3)/2}−ν2<18 を満足することを特徴とするカラー原稿読取用レンズ。1. A three-group, three-element structure in which first to third groups are sequentially arranged from the object side to the image side, and a diaphragm is provided between the first and second groups, wherein the first group is A convex meniscus lens having a convex surface facing the object side, a second group is a biconcave lens, a third group is a biconvex lens, and the focal lengths of the entire system and the first and second groups with respect to the e line: f,
Refractive indices of materials of f 1 and f 2 and the j-th group (j = 1 to 3):
N j , Abbe number: ν j is the condition (1) 0.83 <f 1 /f<0.88 (2) 0.30 <| f 2 /f|<0.33 (3) 0.10 < {(N 1 + N 3 ) / 2} -N 2 <
0.13 (4) 16 <{(ν 1 + ν 3 ) / 2} −ν 2 <18, which is a color original reading lens.
おいて、 レンズ系全長:dTと、e線に対する全系の合成焦点距
離:fとが、条件 (5) 0.25<dT/f<0.26 を満足することを特徴とするカラー原稿読取用レンズ。2. The color original reading lens according to claim 1, wherein the total lens system length: d T and the combined focal length of the entire system with respect to the e-line: f satisfy the condition (5) 0.25 <d T / A lens for reading a color original document, which satisfies f <0.26.
し第3群を配してなり、第2,第3群間に絞りを有する
3群3枚構成であり、 第1群は凸面を物体側に向けた凸メニスカスレンズ、 第2群は両凹レンズ、 第3群は両凸レンズであって、 e線に対する、全系及び第1,第2群の焦点距離:f,
f1,f2、第j群(j=1〜3)の材質の屈折率:
Nj,アッベ数:νjが、条件 (1’) 0.93<f1/f<1.06 (2’) 0.28<|f2/f|<0.32 (3’) 0.11<{(N1+N3)/2}−N2
<0.13 (4’) 15<{(ν1+ν3)/2}−ν2<1
8 を満足することを特徴とするカラー原稿読取用レンズ。3. A three-group, three-element structure having first to third groups arranged in order from the object side to the image side and having a diaphragm between the second and third groups, wherein the first group is A convex meniscus lens having a convex surface facing the object side, a second group is a biconcave lens, a third group is a biconvex lens, and the focal lengths of the entire system and the first and second groups with respect to the e line: f,
Refractive indices of materials of f 1 and f 2 and the j-th group (j = 1 to 3):
N j , Abbe number: ν j is the condition (1 ′) 0.93 <f 1 /f<1.06 (2 ′) 0.28 <| f 2 /f|<0.32 (3 ′) 0 .11 <{(N 1 + N 3) / 2} -N 2
<0.13 (4 ′) 15 <{(ν 1 + ν 3 ) / 2} −ν 2 <1
A lens for reading a color original document, characterized by satisfying 8.
おいて、 レンズ系全長:dTと、e線に対する全系の合成焦点距
離:fとが、条件 (5’) 0.23<dT/f<0.27 を満足することを特徴とするカラー原稿読取用レンズ。4. The color original reading lens according to claim 3, wherein the total lens system length: d T and the combined focal length of the entire system with respect to the e-line: f satisfy the condition (5 ′) 0.23 <d T. A lens for reading a color original document, characterized by satisfying /f<0.27.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20399593A JPH0727974A (en) | 1993-05-12 | 1993-08-18 | Lens for reading color original |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11061393 | 1993-05-12 | ||
JP5-110613 | 1993-05-12 | ||
JP20399593A JPH0727974A (en) | 1993-05-12 | 1993-08-18 | Lens for reading color original |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0727974A true JPH0727974A (en) | 1995-01-31 |
Family
ID=26450210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20399593A Pending JPH0727974A (en) | 1993-05-12 | 1993-08-18 | Lens for reading color original |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0727974A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6927925B2 (en) | 2003-03-12 | 2005-08-09 | Olympus Corporation | Imaging optical system |
US7006305B2 (en) | 2003-04-09 | 2006-02-28 | Olympus Corporation | Image forming optical system and electronic instrument using the same |
US7061694B2 (en) | 2003-04-22 | 2006-06-13 | Olympus Corporation | Image forming optical system and electronic instrument using the same |
-
1993
- 1993-08-18 JP JP20399593A patent/JPH0727974A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6927925B2 (en) | 2003-03-12 | 2005-08-09 | Olympus Corporation | Imaging optical system |
US7006305B2 (en) | 2003-04-09 | 2006-02-28 | Olympus Corporation | Image forming optical system and electronic instrument using the same |
US7061694B2 (en) | 2003-04-22 | 2006-06-13 | Olympus Corporation | Image forming optical system and electronic instrument using the same |
US7248421B2 (en) | 2003-04-22 | 2007-07-24 | Olympus Corporation | Image forming optical system and electronic instrument using the same |
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