JPH0933800A - Read lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the read lens which has excellent performance and is inexpensive. SOLUTION: The read lens is constituted by arranging 1st-6th groups in order from an object side to an image side and has 6-group, 7-element constitution of the 1st group formed of a 1st lens which has its convex surface on the object side, the 2nd group formed of a cemented lens constituted by cementing a 3rd lens 3 which is negative to the object side to the image side of a 2nd positive lens 2, the 3rd group formed of a 4th convex meniscus lens which has its convex surface on the image side, the 4th group formed of a 5th concave lens 5, the 5th group formed of a 6th convex lens 6, and the 6th group formed of a 7th convex meniscus lens 7. The 4th, 5th, and 6th lenses 4-6 are plastic lenses and the 4th lens 6 and 6th lens 6 both have a spherical surfaces on their image sides, and -4.1<f4 /f56 <-1.1 holds, where f4 is the focal length of the 4th lens 4 to an (e) line and f56 is the composite focal length of the 5th and 6th lenses 5 and 6 to the (e) line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a "reading lens", and more particularly to a reading lens including a plastic lens.

[0002]

2. Description of the Related Art In a document reading unit or an image scanner of a facsimile or a digital copying machine, a reading lens reduces a document image to be read and forms an image on a solid-state image pickup device such as a CCD, and the document image is signaled. Turn into.

A reading lens used for reading an original image has a large aperture of F / No = 4.0 and a half angle of view of 20.
A wide angle of view and a wide angle of view, an aperture efficiency of about 100% to the peripheral part of the angle of view, various aberrations are well corrected, and high contrast in a high spatial frequency region is disclosed. 216115 and Japanese Patent Laid-Open No. 63-13311.
The one disclosed in Japanese Patent Publication No. 2 is known.

However, in these reading lenses, in order to obtain the above-mentioned good performance, the convex lens must be formed of an expensive glass material having a high refractive index and low dispersion, resulting in a high cost.

[0005]

In view of the above-mentioned circumstances, the present invention has a large aperture of F / No = 4.0 and a half angle of view of 20.
A wide angle of view and a wide angle of view, the aperture efficiency is close to 100% to the peripheral part of the angle of view, various aberrations are well corrected, high contrast is achieved in the high spatial frequency region, and it can be realized at low cost. The objective is to provide a simple reading lens.

[0006]

The reading lens of the present invention comprises "first to sixth groups are sequentially arranged from the object side to the image side".

That is, the first lens group is a "convex meniscus lens having a convex surface facing the object side", and the second lens group is a "negative lens" on the image side of the second lens, which is a "positive lens". A cemented lens in which a certain third lens is cemented, a third lens group is a “convex meniscus lens having a convex surface facing the image side”, a fourth lens group is a “concave lens”, and a fifth lens group is “concave lens”. The sixth lens is a "convex lens", and the sixth group is a seventh lens which is a "convex meniscus lens having a convex surface directed toward the image side", and thus the whole is of "six elements in six groups".

Of the first to sixth lenses, "the fourth, fifth and sixth lenses are plastic lenses" and both the fourth and sixth lenses have "aspherical surfaces on the image side". .

The above is the "basic lens structure" which provides the basic framework of the reading lens of the present invention.

As described above, the "second group" is a cemented lens made up of the second lens, which is a positive lens, and the third lens, which is a negative lens. The "second group" corresponds to the magnitude relationship between the refractive powers of the second and third lenses. , The second group can have a “negative refractive power” or a “positive refractive power”.

The concave lens forming the "fourth group (fifth lens)" may be in the form of a "biconcave lens" or a "concave meniscus lens", and the "fifth group (sixth lens)". The convex lens forming “” can be in the form of a biconvex lens or a convex meniscus lens.

The "aspherical surface" used for the image-side lens surfaces of the fourth and sixth lenses also has an aspherical shape in which the refracting power increases as the distance from the optical axis increases, and the refractive power increases as the distance from the optical axis increases. Smaller shapes are possible.

[0013] reading lens according to claim 1, in the above "basic lens configuration", the focal length for the e-line of the fourth lens "f ₄ ', the fifth, the combined focal length on e-sixth lens When “f ₅₆ ” is set, these satisfy the condition: (1-1) −4.1 <f ₄ / f ₅₆ <−1.1.

[0014] In the reading lens of claim 1, wherein, "f" the combined focal length on e-of the entire system, "f _1" the focal distance for e-line of the first lens, the second lens to the sixth lens The composite focal length with respect to the e-line of is “f ₂₆ ”, and the first, second, fourth, sixth
The average refractive index and the average Abbe number of the seventh lens with respect to the e-line are “n (convex)” and “ν (convex)”, respectively, and the average refractive index and the average Abbe of the third and fifth lenses having negative refractive power. When the numbers are “n (concave)” and “ν (concave)”, respectively, these conditions are: (2-2) 1.2 <f ₁ / f <2.2 (2-3) -3. 7 <f ₂₆ /f<-1.0 (2-4) 0.06 <n (convex) -n (concave) <0.12 (2-5) 12.2 <ν (convex) -ν (concave) ) <20.6 can be satisfied (Claim 2).

In the "basic lens structure" of the reading lens according to claim 3, the image-side surface of the fourth lens is an "aspherical surface whose converging action increases with distance from the optical axis", and the image side of the sixth lens. surface is "smaller aspherical converging action in accordance with distance from the optical axis", the "f _4, f _{56" condition: (3-1) -3.1 <f 4} / f 56 <-1. It is characterized by satisfying 1.

In the reading lens according to the third aspect, the condition "f, f ₁ , f ₂₆ , n (convex), ν (convex), n (concave) and ν (concave)" is satisfied: (4- _{2) 1.2 <f 1 / f} <2.2 (4-3) -3.7 <f 26 /f<-1.0 (4-4) 0.06 <n ( convex) -n (concave ) <0.12 (4-5) 12.2 <ν (convex) −ν (concave) <20.6 can be satisfied (claim 4).

In the reading lens described in claim 3,
The second lens is a “convex meniscus lens with a convex surface facing the object side”, the third lens is a “concave meniscus lens with a convex surface facing the object side”, and the cemented lens second group has a “negative refractive power”. It is possible to have "(holding)" (Claim 5).

Further, in the reading lens according to the fifth aspect, the above-mentioned "f, f ₁ , f ₂₆ , n (convex), ν (convex), n.
(Concave) and v (concave) "are conditions: (6-2) 1.2 <f ₁ / f <2.2 (6-3) -3.7 <f ₂₆ /f<-1.0 (6 -4) 0.06 <n (convex) -n (concave) <0.12 (6-5) 13.0 <ν (convex) -ν (concave) <20.6 can be satisfied (claim) Item 6).

Further, in the reading lens described in claim 5, "the fifth lens forming the fourth group may be a biconcave lens and the sixth lens forming the fifth group may be a biconvex lens" (claim 7).

In the reading lens according to claim 8, in the "basic lens structure", the second lens is "a convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is It is a "concave meniscus lens with a convex surface facing the object side", and the cemented lens second group has a "negative refractive power", and the fourth group is a "biconcave lens" and a fifth group.
The group is a “convex meniscus lens having a convex surface directed toward the image side”, the image side surface of the fourth lens is “aspherical surface having a converging action increasing with distance from the optical axis”, and the image side surface of the sixth lens "Is an aspherical surface with a converging effect that decreases with distance from the optical axis." Then, the "f _4, f _56", the condition: (8-1) -2.4 <satisfies f ₄ / f ₅₆ <-1.6. The reading lens according to claim 9, wherein in the "basic lens configuration", the second lens is a "convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is a "convex surface facing the object side". Is a "concave meniscus lens", and the second group of these cemented lenses has "negative refractive power", the fourth group is "a concave meniscus lens having a convex surface facing the image side", and the fifth group is It is a “convex meniscus lens having a convex surface directed toward the image side”, and the image-side surface of the fourth lens is “an aspherical surface whose converging action increases with distance from the optical axis”.
The image-side surface of the lens is an "aspherical surface having a converging effect that decreases with distance from the optical axis". Then, the above-mentioned “f ₄ , f ₅₆ ”
The condition: (9-1) -2.3 <satisfies f ₄ / f ₅₆ <-1.8.

In the reading lens according to claim 10, in the "basic lens structure", the second lens is "a convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is "a convex meniscus lens". It is a “concave meniscus lens with a convex surface facing the object side”, and the cemented lens second lens group has a “negative refractive power”, the fourth lens group “biconcave lens”, and the fifth lens group “biconvex lens”. And the image-side surface of the fourth lens "is an aspherical surface whose converging action increases as the distance from the optical axis increases," and the image-side surface of the sixth lens "converging action decreases as it moves away from the optical axis. It is a spherical surface. Then, the above "f ₄ ,
f ₅₆ ″ satisfies the following condition: (10-1) −3.1 <f ₄ / f ₅₆ <−1.1, and the above “f, f ₁ , f ₂₆ , n (convex), ν (convex). , N
(Concave) and ν (concave) "are conditions: (10-2) 1.4 <f ₁ / f <2.1 (10-3) -3.7 <f ₂₆ /f<-1.0 ( 10-4) 0.08 <n (convex) -n (concave) <0.12 (10-5) 13.0 <ν (convex) -ν (concave) <19.1 is satisfied.

In the reading lens according to claim 11, in the "basic lens structure", the second lens is a "convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is "a convex meniscus lens". It is a “concave meniscus lens with a convex surface facing the object side”, and the second group of these cemented lenses has “negative refracting power”, the fourth group is a “biconcave lens”, and the fifth group is “to the image side”. It is a “convex meniscus lens having a convex surface”, and the image-side surface of the fourth lens is “aspherical surface whose converging action increases as the distance from the optical axis is increased”, and the image-side surface of the sixth lens is “away from the optical axis”. It is an aspherical surface with less converging action.
Then, the “f ₄ , f ₅₆ ” satisfies the condition: (11-1) −2.4 <f ₄ / f ₅₆ <−1.6, and the “f, f ₁ , f ₂₆ , n (convex) ), Ν (convex), n
(Concave) and ν (concave) "are conditions: (11-2) 1.2 <f ₁ / f <2.2 (11-3) 2.2 <f ₂₆ /f<-1.1 ( 11-4) 0.07 <n (convex) -n (concave) <0.11 (11-5) 13.3 <ν (convex) -ν (concave) <18.7 is satisfied.

In the reading lens according to the twelfth aspect, in the "basic lens structure", the second lens is a "convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is " A concave meniscus lens having a convex surface directed toward the object side, a second group of these cemented lenses has a "negative refractive power", and a fourth group is a "concave meniscus lens having a convex surface directed toward the image side", The fifth group is a “convex meniscus lens having a convex surface directed toward the image side”, the image side surface of the fourth lens is an “aspherical surface having a converging action increasing with distance from the optical axis”, and the image side of the sixth lens The surface of "is an aspherical surface whose converging action becomes smaller as it goes away from the optical axis". Then, the above "f ₄ ,
f ₅₆ ″ satisfies the condition: (12-1) −2.3 <f ₄ / f ₅₆ <−1.8, and the above “f, f ₁ , f ₂₆ , n (convex), ν (convex), n
(Concave) and ν (concave) "are defined as follows: (12-2) 1.3 <f ₁ / f <1.9 (12-3) -1.7 <f ₂₆ /f<-1.1 ( 12-4) 0.06 <n (convex) −n (concave) <0.1 (12-5) 15.8 <ν (convex) −ν (concave) <20.6 is satisfied.

In the reading lens according to the thirteenth aspect, in the "basic lens structure", the second group has a "positive refractive power", and the fourth group is a "concave meniscus lens having a convex surface facing the image side". The fifth lens group is a “convex lens”, the image-side surface of the fourth lens is “aspherical surface whose converging action increases as the distance from the optical axis is increased”, and the image-side surface of the sixth lens is “aspheric surface as the distance from the optical axis. It is an aspherical surface with a small converging effect. " The “f ₄ , f ₅₆ ” satisfies the condition: (13-1) −2.6 <f ₄ / f ₅₆ <−1.6.

In the reading lens according to the fourteenth aspect, in the "basic lens structure", the second group has a "positive refractive power" and the fourth group is a "concave meniscus lens having a convex surface facing the image side". The fifth lens group is a “convex lens”, the image-side surface of the fourth lens is “aspherical surface whose converging action increases as the distance from the optical axis is increased”, and the image-side surface of the sixth lens is “aspheric surface as the distance from the optical axis. It is an aspherical surface with a small converging effect. "

[0026] Then, the "f _4, f _56", the condition: (14-1) -2.6 <satisfies f ₄ / f ₅₆ <-1.6, the "f, f _1, f ₂₆ , N (convex), ν (convex), n
(Concave) and ν (concave) "are conditions: (14-2) 1.6 <f ₁ / f <2.2 (14-3) −3.0 <f ₂₆ /f<−1.6 ( 14-4) 0.08 <n (convex) -n (concave) <0.12 (14-5) 12.2 <ν (convex) -ν (concave) <15.8 is satisfied.

In the reading lens according to the fifteenth aspect, in the "basic lens structure", the second lens is a "convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is "a convex meniscus lens". It is a “concave meniscus lens having a convex surface directed toward the object side”, and the second lens group, which is a cemented lens thereof, has “negative refracting power”, and the image-side surface of the fourth lens “converges as it departs from the optical axis”. small aspherical "on a surface on the image side of the sixth lens is" larger aspheric converging action in accordance with distance from the optical axis ", the" f _4, f ₅₆ ", the condition: (15-1 ) -4.1 <satisfies f ₄ / f ₅₆ <-1.7.

[0028] In reading lens of claim 15, wherein the _{"f, f 1, f 26,} n ( convex), [nu (convex), n (concave) and [nu (concave)" the condition: (16 2) 1.1 <f ₁ / f <2.1 (16-3) -2.2 <f ₂₆ /f<-0.8 (16-4) 0.07 <n (convex) -n (concave) ) <0.11 (16-5) 13.6 <ν (convex) −ν (concave) <20.5 can be satisfied (claim 16).

In the reading lens according to claim 17, in the "basic lens structure", the second lens is "a convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is the "object". It is a "concave meniscus lens with a convex surface facing toward the side", and the second group of these cemented lenses has "negative refracting power", the fourth group is a "biconcave lens", and the fifth group is a "biconvex lens". Then, the image-side surface of the fourth lens "is an aspherical surface having a converging effect that becomes smaller as it goes away from the optical axis", and the image-side surface of the sixth lens "an aspherical surface that has a larger convergence as it goes away from the optical axis". And the above “f ₄ , f ₅₆ ” satisfies the condition: (17-1) −4.1 <f ₄ / f ₅₆ <−3.0.

In the reading lens according to the seventeenth aspect of the present invention, the "f, f ₁ , f ₂₆ , n (convex), ν (convex), n (concave) and ν (concave)" satisfy the condition: (18- _{2) 1.3 <f 1 / f} <1.8 (18-3) -1.1 <f 26 /f<-0.8 (18-4) 0.08 <n ( convex) -n (concave ) <0.10 (18-5) 16.8 <ν (convex) −ν (concave) <20.5 can be satisfied (claim 18).

In the reading lens according to claim 19, in the "basic lens structure", the second lens is a "convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is the "object". The second group, which is a cemented lens having a convex surface facing toward the side, has a "negative refractive power", the fourth group is a "biconcave lens", and the fifth group is a "convex surface toward the image side". Is a convex meniscus lens, in which the image-side surface of the fourth lens is an "aspherical surface having a converging effect that decreases with distance from the optical axis", and the image-side surface of the sixth lens is separated from the optical axis. an aspheric "which increases the astringent accordance, the is" f _4, f _{5 6} "conditions: a (19-1) -2.7 <satisfying the f ₄ / f ₅₆ <-1.9 Characterize.

In the reading lens according to the nineteenth aspect of the present invention, the "f, f ₁ , f ₂₆ , n (convex), ν (convex), n (concave) and ν (concave)" satisfy the condition: (20- 2) 1.4 <f ₁ / f <2.0 (20-3) -1.7 <f ₂₆ /f<-1.2 (20-4) 0.08 <n (convex) -n (concave) ) <0.10 (20-5) 16.8 <ν (convex) −ν (concave) <20.5 can be satisfied (claim 20).

In the reading lens according to claim 21, in the "basic lens structure", the second lens is "a convex meniscus lens having a convex surface facing the object side", and the third lens cemented to the image side is the "object". The second group, which is a cemented lens having a convex surface directed toward the side, has a "negative refractive power", and the fourth group is a "concave meniscus lens having a convex surface directed toward the image side". The fifth group is a “convex meniscus lens having a convex surface directed toward the image side”, and the image-side surface of the fourth lens is an “aspherical surface having a converging effect that decreases with distance from the optical axis”.
The surface on the image side of the lens is “aspherical surface whose converging action increases with distance from the optical axis”. And the above "f ₄ , f ₅₆ "
The condition: (21-1) -2.3 <satisfies f ₄ / f ₅₆ <-1.7.

In the reading lens according to the twenty- _{first aspect} , the "f, f ₁ , f ₂₆ , n (convex), ν (convex), n (concave) and ν (concave)" satisfy the condition: (22- 2) 1.1 <f ₁ / f <2.1 (22-3) -2.2 <f ₂₆ /f<-1.0 (22-4) 0.07 <n (convex) -n (concave) ) <0.11 (22-5) 13.6 <ν (convex) −ν (concave) <18.7 can be satisfied (claim 22).

As described above, the reading lens of the present invention is "6 groups 7 elements", and the second group is "junction lens",
The fourth to sixth lenses are plastic lenses, and the image-side surfaces of the fourth lens and the sixth lens are “aspherical surfaces”.

Hereinafter, each conditional expression will be described. As can be seen from the above, each conditional expression is represented by "expression: (m
-N) ". The numerical value in this expression: (mn): m (1 to 22) represents the number of the claim in which each conditional expression is described. The meanings of the above conditional expressions are the same when the numerical values: n (1 to 5) are the same.

Therefore, although the range of each parameter of the conditions to be satisfied by the reading lens of the present invention differs depending on the claims, the condition of making the numerical value: n common has the same meaning, and hence the following numerical values: n. The same conditions will be collectively described as condition (n) (n = 1 to 5).

The condition (1) is a condition for favorably correcting the focal length variation of the plastic lenses adopted as the fourth to sixth lenses due to the temperature change.

Of the three lenses formed of plastic lenses, the "change in focal length due to temperature change" in the fourth and sixth lenses which are convex lenses, and the "change in focal length due to temperature change" in the fifth lens which is a concave lens However, the above-mentioned cancellation becomes insufficient outside the range of the condition (1).

If the upper limit of the condition (1) is exceeded, the focal length of the entire system will move positively greatly at low temperature, and if the lower limit is exceeded, the focal length of the entire system will move negatively greatly at low temperature. Will end up. Therefore, outside the range of the condition (1), good performance on the image plane cannot be obtained.

The condition (2) is a condition for determining the power of the first lens unit. When the upper limit is exceeded, the positive power of the first lens unit becomes too weak and the "distortion aberration" becomes large on the negative side. It becomes difficult to correct. When the value goes below the lower limit of the condition (2), the power of the first lens unit becomes too strong, the spherical aberration becomes large on the negative side, and the coma aberration also increases.

The condition (3) is that the lens closest to the object side (first lens)
(Lens) and the lens closest to the image side (seventh lens) are conditions for determining the combined power of the second to sixth lenses. Above the upper limit, the combined power becomes too strong and the object is moved in the negative direction. If taken, the coma flare will increase with the upper ray, and if the lower limit is exceeded, the combined power will be too weak, and if the object is taken in the negative direction, the coma flare will increase with the lower ray.

The condition (4) is the "refractive index range" of the five "convex lenses" and the two "concave lenses" constituting the reading lens.
When the upper limit is exceeded, the “Petzval sum” becomes too small, and the image surface falls to the positive side and the “image surface curvature” becomes large. On the contrary, when the value goes below the lower limit of the condition (4), the Petzval sum becomes too large, and the image surface falls to the negative side and the "astigmatic difference" becomes large. Therefore, condition (4)
Outside the range, it is difficult to obtain good imaging performance on the entire image plane.

The condition (5) is a condition for correcting the "axial chromatic aberration". When the upper limit is exceeded, the axial chromatic aberration is overcorrected, and the wavelength is shorter than the main wavelength (e line). It becomes larger on the positive side, and when the value goes below the lower limit, the correction becomes insufficient and becomes large on the negative side on the shorter wavelength side than the main wavelength.

The range of each parameter of these conditions (1) to (5) differs according to the claims, but it is the fourth.
This is because the specific lens form of the fifth and fifth groups, and the positive and negative power of the second group and the form of the aspherical surface are different, and in each claim, the above parameters are within the range of each conditional expression, which is good. Performance can be achieved.

[0046]

EXAMPLES Specific examples will be given below.

In FIG. 1, reference numeral 1 is the first lens of the first group, reference numeral 2 is the second lens, and reference numeral 3 is the second lens "joined to the second lens 2 to form the second group together with the second lens". Lens, reference numeral 4 is a fourth lens forming the third group, reference numeral 5 is a fourth lens
The fifth lens forming the group, reference numeral 6 indicates the sixth lens forming the fifth group, reference numeral 7 indicates the seventh lens forming the sixth group, and reference numeral S indicates the diaphragm. Reference numeral 8 indicates a "cover glass of a solid-state image sensor (CCD)".

The first lens 1 and the second lens 2 are "a convex meniscus lens having a convex surface facing the object side", the third lens 3 is a "concave meniscus lens having a convex surface facing the object side", and the fourth lens 4 is " A convex meniscus lens with the convex surface facing the image side ",
The fifth lens 5 is a “concave lens”, the sixth lens is a “convex lens”, and the seventh lens 7 is a “convex meniscus lens having a convex surface facing the image side”.

As shown in FIG. 1, the radius of curvature of the i-th surface (including the surface of the diaphragm) counted from the object side (left side of the drawing) is r _i (i = 1 to 14), i-th surface The surface spacing on the optical axis between the surface i and the (i + 1) th surface is represented by d _i (i = 1 to 13). Further, the refractive index and the Abbe number of the j-th lens for the e-line counted from the object side are represented by n _j and ν _j , respectively.

Further, regarding the cover glass 8, the radius of curvature of the object side surface is r ₁₅ (i = 15), the radius of curvature of the image side surface is r ₁₆ (i = 16), and the thickness is d _15. (i = 15), and the refractive index and Abbe number for e-line are n ₈ and ν ₈ (j = 8)
And

[0051] Also as described above, the "combined focal length for system e-line" f, f ₁ the "focal distance for e-line of the first lens,""synthetic focus for e line of the second lens to the sixth lens The distance is f ₂₆ , the “focal length of the fourth lens with respect to the e-line” is f ₄ , and the combined focal length of the fifth and sixth lenses with respect to the e-line is f ₅₆ . The average refractive index and the average Abbe number of the sixth and seventh lenses for the e-line are n (convex) and ν (convex), respectively, and the "average refractive index and the average Abbe number of the third and fifth lenses" are respectively Let n (concave) and v (concave).

F / No represents brightness (F number), m represents magnification, ω represents half angle of view, and Y represents object height.

As is well known, the aspherical surface is made to coincide with the optical axis by X
When the coordinates are taken and the H coordinate is set orthogonally to the optical axis,
When the radius of curvature on the optical axis is r, the conic constant is K, and the higher-order aspherical coefficients are A, B, C, and D, X = (1 / r) H ² / {1 + √ [1- (1 + K ) (H /
r) ² ]} + A · H ⁴ + B · H ⁶ + C · H ⁸ + D · H ¹⁰ is a curved surface obtained by rotating around the optical axis, and the radius of curvature on the optical axis is r The shape is specified by giving a conic constant: K and high-order aspherical surface coefficients: A, B, C, D. In addition, in the display of the aspherical surface coefficient, E and the number following it indicate a power. That is, for example, "E-9" means 1/10 ⁹ and this number is multiplied by the preceding number.

Each example shows the specifications under the standard condition (20 ° C.), the low temperature condition (0 ° C.) and the high temperature condition (65 ° C.).

Example 1 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 27.60801 2.16730 1 1.83930 37.34 2 44.62388 0.50 3 15.47706 3.81975 2 1.77621 49.62 4 104.14040 2.00 3 1.59666 35.45 5 9.72107 5.28679 6 ∞ (diaphragm) 3.60751 7 -31.24018 1.50 4 1.52833 56.15 8 -19.05473 1.00 9 -108.57775 1.50 5 11 176.88679 2.89098 6 1.52833 56.15 12 -18.40381 2.81523 13 -63.92800 3.26259 7 1.81081 40.73 14 -20.57941 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image side lens surface of the fourth lens (i = 8) K = 0.68314, A = -1.46698E-5
B = -9.51388E-7, C = 1.97776E
-8, D = -4.11344E-10 Image-side lens surface (i = 12) of sixth lens K = -0.32252, A = 1.40640E-5,
B = 7.37679E-8, C = 6.18725E
-10, D = 5.06512E-12.

Low temperature state (0 degree C) ir _i d _i j j n _j ν _j 1 27.60801 2.16730 1 1.83930 37.34 2 44.62388 0.50 3 15.47706 3.81975 2 1.77621 49.62 4 104.14040 2.00 3 1.59666 35.45 5 9.72107 5.28679 6 ∞ (diaphragm) 3.60856 7 -31.19644 1.49790 4 1.53101 55.59 8 -19.02805 1.00210 9 -10.86252 1.49790 5 1.59075 30.64 10 335.03076 0.20307 11 176.63915 2.88693 6 1.53101 56.59 12 -18.37805 2.81725 13 -63.92800 3.26259 7 1.81081 40.73 14 ∞.202057941 15

Aspheric surface Image-side lens surface of fourth lens (i = 8) K = 0.68314, A = -1.47316E-5,
B = -9.58076E-7, C = 1.99725E
-8, D = -4.16563E-10 Image-side lens surface (i = 12) of sixth lens K = -0.32252, A = 1.41232E-5
B = 7.42865E-8, C = 6.24823E
-10, D = 5.123939E-12.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 27.60801 2.16730 1 1.83930 37.34 2 44.62388 0.50 3 15.47706 3.81975 2 1.77621 49.62 4 104.14040 2.00 3 1.59666 35.45 5 9.72107 5.28679 6 ∞ (diaphragm) 3.60514 7 -31.33859 1.50473 4 1.52232 57.41 8 -19.11475 0.99527 9 -10.91202 1.50473 5 1.58389 29.99 10 336.55729 0.19308 11 177.44398 2.90009 6 1.52232 57.41 12 -18.46178 2.81067 13 -63.92800 3.26259 7 1.81081 40.73 14 ∞ 64.2020 857941

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.68314, A = -1.45320E-5,
B = -9.336544E-7, C = 1.93470E
-8, D = -3.99864E-10 Image-side lens surface (i = 12) of sixth lens K = -0.32252, A = 1.39319E-5
B = 7.26170E-8, C = 6.05252E
-10, D = 4.92376E-12.

Example 2 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.1102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 32.21708 2.00 1 1.83930 37.34 2 66.77920 0.50 3 13.49066 3.21115 2 1.77621 49.62 4 66.38600 2.00 3 1.62409 36.30 5 8.89945 5.27525 6 ∞ (aperture) 2.49122 7 -55.07163 3.00 4 1.52833 56.15 8 -18.80423 1.00 9 -108863 30.44.50 51.5 11 76.91358 5.14588 6 1.52833 56.15 12 -20.08209 4.42472 13 -188.83046 2.48569 7 1.83930 37.34 14 -30.01485 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 3.18290, A = -5.76498E-5,
B = 7.553837E-7, C = -7.33944E
-8, D = 1.09556E-9 Image-side lens surface (i = 12) of sixth lens K = -0.366699, A = 3.50269E-5,
B = -1.80321E-7, C = 5.70913E
-9, D = -3.05967E-11.

Low temperature state (0 degree C) ir _i d _i j j n _j ν _j 1 32.21708 2.00 1 1.83930 37.34 2 66.77920 0.50 3 13.49066 3.21115 2 1.77621 49.62 4 66.38600 2.00 3 1.62409 36.30 5 8.89945 5.27525 6 ∞ (diaphragm) 2.49332 7 -54.99453 2.99580 4 1.53101 55.59 8 -18.77790 1.00315 9 -10.28871 1.49790 5 1.59075 30.64 10 117.53188 0.20465 11 76.80590 5.13868 6 1.53101 55.59 12 -20.05398 4.42831 13 -188.01485 2.48569 7 1.83930 37.34 14 -30.01485 15 ∞ ∞

Aspheric surface Image side lens surface of the fourth lens (i = 8) K = 3.18290, A = -5.789926E-5,
B = 7.59136E-7, C = -7.41177E
-8, D = 1.10946E-9 Image-side lens surface of the sixth lens (i = 12) K = -0.366699, A = 3.51744E-5,
B = -1.81589E-7, C = 5.76539E
-9, D = -3.09849E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 32.21708 2.00 1 1.83930 37.34 2 66.77920 0.50 3 13.49066 3.21115 2 1.77621 49.62 4 66.38600 2.00 3 1.62409 36.30 5 8.89945 5.27525 6 ∞ (diaphragm) 2.48649 7 -55.24511 3.00945 4 1.52232 57.41 8 -18.86346 0.99290 9 -10.33559 1.50473 5 1.58389 29.99 10 118.06739 0.18953 11 77.15586 5.16209 6 1.52232 57.41 12 -20.14535 4.41659 13 -188.83046 2.48569 7 1.83930 37.34 14 -30.01 1.5152 8∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 3.18290, A = -5.71084E-5,
B = 7.42075E-7, C = -7.17963E
-8, D = 1.106498-9 Image-side lens surface (i = 12) of sixth lens K = -0.366699, A = 3.46980E-5
B = -1.77508E-7, C = 5.58482E
-9, D = -2.974428E-11.

Example 3 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 23.48879 2.40842 1 1.80831 46.50 2 39.07554 0.50 3 16.31836 3.44677 2 1.77621 49.62 4 67.35488 2.00 3 1.59666 35.45 5 10.03911 5.55869 6 ∞ (aperture) 3.51442 7 -40.63889 1.50 4 1.52833 56.15 8 -23.30517 1.00 9 -10.8851 3012.44 51.045 10.12 11 346.70236 2.19800 6 1.52833 56.15 12 -26.98600 1.11735 13 -64.20983 3.21991 7 1.83962 42.98 14 -17.84959 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.56251, A = -1.01961E-5,
B = 8.20568E-7, C = −3.92900E
-8, D = 5.74529E-10 Image-side lens surface (i = 12) of sixth lens K = -0.68529, A = 1.61126-5, B
= -3.13368E-7, C = 6.17757E-
9, D = -4.08485E-11.

Low temperature condition (0 degree C) ir _i d _i j j n _j ν _j 1 23.48879 2.40842 1 1.80831 46.50 2 39.07554 0.50 3 16.31836 3.44677 2 1.77621 49.62 4 67.35488 2.00 3 1.59666 35.45 5 10.03911 5.55869 6 ∞ (diaphragm) 3.51547 7 -40.58200 1.49790 4 1.53101 55.59 8 -23.27254 1.00210 9 -11.84191 1.49790 5 1.59075 30.64 10 297.88949 0.20259 11 346.21698 2.19492 6 1.53101 55.59 12 -26.94822 1.11888 13 -64.20983 3.21991 7 1.83962 42.98 14 ∞ --208959.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.56251, A = -1.02390E-5,
B = 8.263336E-7, C = -3.96772E
-8, D = 5.81819E-10 Image-side lens surface (i = 12) of sixth lens K = -0.68529, A = 1.61805-5, B
= -3.15571E-7, C = 6.23845E-
9, D = -4.13668E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 23.48879 2.40842 1 1.80831 46.50 2 39.07554 0.50 3 16.31836 3.44677 2 1.77621 49.62 4 67.35488 2.00 3 1.59666 35.45 5 10.03911 5.55869 6 ∞ (diaphragm) 3.51206 7.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.56251, A = -1.01004E-5,
B = 8.07765E-7, C = -3.84345E
-8, D = 5.558495E-10 Image-side lens surface (i = 12) of sixth lens K = -0.68529, A = 1.59613-5, B
= -3.08479E-7, C = 6.04306E-
9, D = -3.97085E-11.

Example 4 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 26.36642 2.06067 1 1.80831 46.50 2 45.78350 0.50 3 15.81828 3.29054 2 1.77621 49.62 4 181.96860 2.00 3 1.61686 36.96 5 10.42808 3.97294 6 ∞ (aperture) 2.86238 7 -29.36628 2.48780 4 1.52833 56.15 8. 11 519.98041 2.76592 6 1.52833 56.15 12 -19.61237 0.20336 13 -51.94931 2.63937 7 1.83930 37.34 14 -19.43557 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of fourth lens (i = 8) K = 0.63023, A = -1.12197E-5
B = 5.80966E-7, C = -3.49278E
-8, D = 5.22156E-10 Image-side lens surface (i = 12) of sixth lens K = -0.22028, A = 9.26892E-6,
B = -2.90517E-7, C = 5.993193E
-9, D = -3.92426E-11.

Low temperature state (0 degree C) ir _i d _i j j n _j ν _j 1 26.36642 2.06067 1 1.80831 46.50 2 45.78350 0.50 3 15.81828 3.29054 2 1.77621 49.62 4 181.96860 2.00 3 1.61686 36.96 5 10.42808 3.97294 6 ∞ (diaphragm) 2.86412 7 -29.32517 2.48431 4 1.53101 55.59 8 -19.27457 1.00279 9 -10.79835 1.49790 5 1.59075 30.64 10 788.25333 0.20299 11 519.25244 2.76205 6 1.53101 55.59 12 -19.58491 0.20529 13 -51.94931 2.63937 7 1.83930 37.34 14 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.63023, A = -1.12670E-5,
B = 5.85050E-7, C = -3.52720E
-8, D = 5.28782E-10 Image-side lens surface (i = 12) of sixth lens K = -0.22028, A = 9.30796E-6,
B = -2.92559E-7, C = 5.99039E
-9, D = -3.97405E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 26.36642 2.06067 1 1.80831 46.50 2 45.78350 0.50 3 15.81828 3.29054 2 1.77621 49.62 4 181.96860 2.00 3 1.61686 36.96 5 10.42808 3.97294 6 ∞ (diaphragm) 2.85846 7 -29.45878 2.49563 4 1.52232 57.41 8 -19.36239 0.99371 9 -10.84755 1.50473 5 1.58389 29.99 10 791.84491 0.19327 11 521.61835 2.77463 6 1.52232 57.41 12 -19.58491 0.20529 13 -51.94931 2.63937 7 1.83930 37.34 14 -19.43557 15∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.63023, A = -1.11143E-5,
B = 5.71902E-7, C = -3.41673E
-8, D = 5.07583E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.22028, A = 9.18188E-6,
B = -2.85984E-7, C = 5.80276E
-9, D = -3.81474E-11.

Example 5 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 24.44429 2.35436 1 1.80831 46.50 2 38.89380 0.50 3 16.34216 3.63582 2 1.80831 46.50 4 72.37908 2.00 3 1.59666 35.45 5 9.72027 5.92037 6 ∞ (aperture) 2.83430 7 -45.87975 1.50 4 1.52833 56.15 8 -23.36395 1.00 9 -10.8864830.44 5.44 11 324.09517 2.00381 6 1.52833 56.15 12 -27.37767 2.57739 13 -69.97076 3.44501 7 1.80831 46.50 14 -17.95745 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.83938, A = -1.46065E-5,
B = 9.119759E-7, C = -4.93309E
-8, D = 7.81021E-10 Image-side lens surface (i = 12) of sixth lens K = -1.34695, A = 1.90916E-5
B = -3.54258E-7, C = 7.77794E
-9, D = -5.69718E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 24.44429 2.35436 1 1.80831 46.50 2 38.89380 0.50 3 16.34216 3.63582 2 1.80831 46.50 4 72.37908 2.00 3 1.59666 35.45 5 9.72027 5.92037 6 ∞ (diaphragm) 2.83534 7 -45.81552 1.49790 4 1.53101 55.59 8 -23.33124 1.00210 9 -12.39108 1.49790 5 1.59075 30.64 10 187.71365 0.20245 11 323.64144 2.00100 6 1.53101 55.59 12 -27.33934 2.57879 13 -69.97076 1645050 7 1.80831 46.50 14 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.83938, A = -1.46680E-5,
B = 9.26224E-7, C = -4.98171E
-8, D = 7.90931E-10 Image-side lens surface of the sixth lens (i = 12) K = -1.34695, A = 1.91720E-5,
B = -3.56748E-7, C = 7.85459E
-9, D = -5.76947E-11.

High temperature state (65 degrees C) ir _i d _i j n _j ν _j 1 24.44429 2.35436 1 1.80831 46.50 2 38.89380 0.50 3 16.34216 3.63582 2 1.80831 46.50 4 72.37908 2.00 3 1.59666 35.45 5 9.72027 5.92037 6 ∞ (diaphragm) 2.83193 7 -46.02427 1.50473 4 1.52232 57.41 8 -23.43755 0.99527 9 -12.44754 1.50473 5 1.58389 29.99 10 188.56895 0.19447 11 325.11607 2.01012 6 1.53101 57.41 12 -27.46 391 2.57422 13 -69.97076 3.44501 7 1.80831 46.50 14 ∞.708 945 15 15

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.83938, A = -1.44693E-5,
B = 9.05409E-7, C = -4.82567E
-8, D = 7.592224E-10 Image-side lens surface (i = 12) of sixth lens K = -1.34695, A = 1.89123E-5
B = -3.48731E-7, C = 7.60858E
−9, D = −5.553818E-11.

As described above, the first to fifth embodiments are described in claims 1 to 7 and 1.
1 is an example of a reading lens belonging to No. 0, and the lens configurations of these examples are as shown in FIG. 1, and the fifth lens 5 as a “concave lens” is a “biconcave lens” and the sixth lens as a “convex lens”. Is a "biconvex lens".

Example 6 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 32.28427 2.09931 1 1.83930 37.34 2 57.12634 0.50 3 16.38857 3.93392 2 1.77621 49.62 4 607.73420 2.00 3 1.61686 36.96 5 10.60896 5.39175 6 ∞ (Aperture) 2.21907 7 -30.34188 1.89881 4 1.52833 56.15 8 -18.96439 1.00 9 5-11.49210 10.50 5-11.23910 10.50 11 -251.80756 2.26000 6 1.52833 56.15 12 -19.43787 3.15490 13 -84.75741 3.17000 7 1.81986 44.54 14 -20.54935 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of fourth lens (i = 8) K = 0.666646, A = -1.32838E-5,
B = 6.50217E-7, C = -2.74745E
-8, D = 3.933353E-10 Image-side lens surface (i = 12) of sixth lens K = -0.25050, A = 8.71746E-6,
B = -2.13937E-7, C = 4.14723E
-9, D = -3.11657E-11.

Low temperature state (0 degree C) ir _i d _i j j n _j ν _j 1 32.28427 2.09931 1 1.83930 37.34 2 57.12634 0.50 3 16.38857 3.93392 2 1.77621 49.62 4 607.73420 2.00 3 1.61686 36.96 5 10.60896 5.39175 6 ∞ (diaphragm) 2.22040 7 -30.29940 1.89615 4 1.53101 55.59 8 -18.93784 1.00238 9 -11.22337 1.49790 5 1.59075 30.64 10 492.11995 0.20263 11 -251.45503 2.25683 6 1.53101 55.59 12 -19.41066 3.15648 13 -84.75741 3.17000 7 1.81986 44.54 14 -20.54935 15187 ∞ .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.666646, A = -1.333398E-5,
B = 6.54788E-7, C = -2.77453E
-8, D = 3.98344E-10 Image-side lens surface (i = 12) of sixth lens K = -0.25050, A = 8.754418E-6
B = -2.15441E-7, C = 4.18810E
-9, D = -3.15611E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 32.28427 2.09931 1 1.83930 37.34 2 57.12634 0.50 3 16.38857 3.93392 2 1.77621 49.62 4 607.73420 2.00 3 1.61686 36.96 5 10.60896 5.39175 6 ∞ (diaphragm) 2.21608 7 -30.43746 1.90479 4 1.52232 57.41 8 -19.02413 0.99464 9 -11.27450 1.50473 5 1.58389 29.99 10 494.36223 0.19407 11 -252.60075 2.26712 6 1.52232 57.41 12 -19.49910 3.15133 13 -84.75741 3.17000 7 1.81986 44.54 14 -20.54935 15187 ∞ .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.666646, A = -1.31591E-5,
B = 6.40072E-7, C = -2.68763E
-8, D = 3.82375E-10 Image-side lens surface (i = 12) of sixth lens K = -0.25050, A = 8.63560E-6,
B = -2.10599E-7, C = 4.05692E
-9, D = -3.02959E-11.

Example 7 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 30.89559 2.37541 1 1.83930 37.34 2 55.65992 0.50 3 16.23862 4.35233 2 1.77621 49.62 4 183.93914 2.00 3 1.61686 36.96 5 9.73014 6.35728 6 ∞ (aperture) 1.39980 7 -35.66131 1.71269 4 1.52833 56.15 8 -19.52624 1.00 9 5-11.45869 1.50 11 -245.06297 2.05193 6 1.52833 56.15 12 -19.19498 4.34018 13 -75.97630 4.51598 7 1.77621 49.62 14 -19.36836 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.14694, A = -3.06843E-5,
B = 1.05322E-6, C = -7.21134E
-8, D = 1.18489E-9 Image-side lens surface (i = 12) of sixth lens K = -0.83711, A = 1.70024E-5
B = -1.09833E-7, C = 5.555938E
-9, D = -3.900008E-11.

Cold state (0 degree C) ir _i d _i j n _j ν _j 1 30.89559 2.37541 1 1.83930 37.34 2 55.65992 0.50 3 16.23862 4.35233 2 1.77621 49.62 4 183.93914 2.00 3 1.61686 36.96 5 9.73014 6.35728 6 ∞ (aperture) 1.40100 7 -35.61138 1.71029 4 1.53101 55.59 8 -19.49890 1.00225 9 -11.44265 1.49790 5 1.59075 30.64 10 2290.76670 0.20249 11 -244.71988 2.04905 6 1.53101 55.59 12 -19.16811 4.34161 13 -75.97630 4.51598 7 1.77621 49.62 14 ∞ 19.036836 361 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.146694, A = -3.08135E-5,
B = 1.06062E-6, C = -7.282241E
-8, D = 1.19993E-9 Image-side lens surface (i = 12) of sixth lens K = -0.83711, A = 1.70740E-5
B = -1.16055E-7, C = 5.61417E
-9, D = -3.494957E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 30.89559 2.37541 1 1.83930 37.34 2 55.65992 0.50 3 16.23862 4.35233 2 1.77621 49.62 4 183.93914 2.00 3 1.61686 36.96 5 9.73014 6.35728 6 ∞ (diaphragm) 1.39711 7 -35.77364 1.71809 4 1.52232 57.41 8 -19.58775 0.99493 9 -11.49479 1.50473 5 1.58389 29.99 10 2301.20430 0.19440 11 -245.83492 2.05839 6 1.52232 57.41 12 -19.25544 4.33693 13 -75.97630 4.51598 7 1.77621 49.62 14 ∞-19.36836 15 15 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.146694, A = -3.03962E-5,
B = 1.03679E-6, C = -7.05432E
-8, D = 1.15182E-9 Image-side lens surface (i = 12) of sixth lens K = -0.83711, A = 1.68427E-5
B = -1.08119E-7, C = 5.43833E
-9, D = -3.79123E-11.

Example 8 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 28.67340 2.00 1 1.83930 37.34 2 49.64745 0.50 3 15.18762 3.06963 2 1.77621 49.62 4 344.85320 2.00 3 1.61686 36.96 5 10.17726 5.023 6 ∞ (aperture) 2.31277 7 -30.59789 1.66214 4 1.52833 56.15 8 -18.67730 1.00 9 -11.34030.44 51.54 11 -296.98969 2.29178 6 1.52833 56.15 12 -19.30961 3.78378 13 -96.12166 2.86331 7 1.83962 37.34 14 -23.43191 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.97334, A = -1.69995E-5,
B = 7.26374E-7, C = -3.92256E
-8, D = 6.12553E-10 Image-side lens surface (i = 12) of sixth lens K = -0.23455, A = 8.23183E-6,
B = -1.993932E-7, C = 4.07765E
-9, D = -3.02161E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 28.67340 2.00 1 1.83930 37.34 2 49.64745 0.50 3 15.18762 3.06963 2 1.77621 49.62 4 344.85320 2.00 3 1.61686 36.96 5 10.17726 5.023 6 ∞ (diaphragm) 2.31393 7 -30.55505 1.65981 4 1.53101 55.59 8 -18.65115 1.00221 9 -11.32472 1.49790 5 1.59075 30.64 10 602.36339 0.41758 11 -296.57396 2.28858 6 1.53101 55.59 12 -19.28258 3.78539 13 -96.12166 2.86331 7 1.83962 37.34 14 ∞ -32.43191 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.97334, A = -1.70711E-5,
B = 7.31480E-7, C = -3.96122E
-8, D = 6.20326E-10 Image-side lens surface (i = 12) of sixth lens K = -0.23455, A = 8.26650E-6,
B = -1.95295E-7, C = 4.11784E
-9, D = -3.05995E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 28.67340 2.00 1 1.83930 37.34 2 49.64745 0.50 3 15.18762 3.06963 2 1.77621 49.62 4 344.85320 2.00 3 1.61686 36.96 5 10.17726 5.023 6 ∞ (diaphragm) 2.31015 7. .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.79734, A = -1.68399E-5,
B = 7.15041E-7, C = -3.83715E
-8, D = 5.95458E-10 Image-side lens surface (i = 12) of sixth lens K = -0.23455, A = 8.15453E-6,
B = -1.90906E-7, C = 3.998886E
-9, D = -2.93728E-11.

Example 9 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 28.77990 2.00 1 1.83930 37.34 2 50.58721 0.50 3 15.31342 3.37231 2 1.77621 49.62 4 281.48210 2.00 3 1.62409 36.30 5 10.06623 5.69921 6 ∞ (Aperture) 2.54772 7 -30.53329 1.50000 4 1.52833 56.15 8 -19.60908 1.00 9 -10.8867.030.44 5. 11 -196.26263 2.28521 6 1.52833 56.15 12 -19.57116 2.82038 13 -93.31265 4.93858 7 1.80831 46.50 14 -21.98698 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.25470, A = -7.03825E-6,
B = 4.15023E-7, C = -2.91117E
-8, D = 5.25810E-10 Image-side lens surface (i = 12) of sixth lens K = -0.29691, A = 9.54986E-6,
B = -4.25935E-7, C = 8.76322E
-9, D = -6.35941E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 28.77990 2.00 1 1.83930 37.34 2 50.58721 0.50 3 15.31342 3.37231 2 1.77621 49.62 4 281.48210 2.00 3 1.62409 36.30 5 10.06623 5.69921 6 ∞ (diaphragm) 2.54877 7. .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.25470, A = -7.06789E-6,
B = 4.17940E-7, C = -2.93986E
-8, D = 5.32482E-10 Image-side lens surface (i = 12) of sixth lens K = -0.29691, A = 9.59008E-6,
B = -4.289929E-7, C = 8.84958E
-9, D = -6.44010E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 28.77990 2.00 1 1.83930 37.34 2 50.58721 0.50 3 15.31342 3.37231 2 1.77621 49.62 4 281.48210 2.00 3 1.62409 36.30 5 10.06623 5.69921 6 ∞ (diaphragm) 2.54536 7 -30.62947 1.50473 4 1.52232 57.41 8 -19.67085 0.99527 9 -11.91708 1.50473 5 1.58389 29.99 10 1130.55070 0.43615 11 -196.88086 2.29241 6 1.52232 57.41 12 -19.63281 2.81677 13 -93.31265 4.93858 7 1.80831 46.50 14 -21.920 98 15 .

Aspheric surface Image side lens surface of the fourth lens (i = 8) K = 0.25470, A = -6.97216E-6,
B = 4.08548E-7, C = -2.84778E
-8, D = 5.11135E-10 Image-side lens surface (i = 12) of sixth lens K = -0.29691, A = 9.46018E-6,
B = -4.19290E-7, C = 8.572240E
-9, D = -6.18193E-11.

Example 10 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 23.90174 3.80642 1 1.83930 37.34 2 44.82004 0.64244 3 16.65201 3.32774 2 1.77621 49.62 4 251.37445 2.00 3 1.65223 33.84 5 10.04293 5.93243 6 ∞ (Aperture) 2.14132 7 -30.79104 1.50000 4 1.52833 56.15 8 -19.64765 1.00 9 -188611 3025.44. 11 -196.01713 2.27689 6 1.52833 56.15 12 -19.55934 2.73051 13 -93.61607 5.00 7 1.80831 46.50 14 -21.28471 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of fourth lens (i = 8) K = 0.09572, A = -4.656576E-6,
B = 7.01545E-7, C = -4.557326E
-8, D = 8.28222E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.24701, A = 8.2022E-6,
B = -4.000762E-7, C = 7.891119E
-9, D = -5.541111E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 23.90174 3.80642 1 1.83930 37.34 2 44.82004 0.64244 3 16.65201 3.32774 2 1.77621 49.62 4 251.37445 2.00 3 1.65223 33.84 5 10.04293 5.93243 6 ∞ (diaphragm) 2.14237 7-30.74793 1.49790 4 1.53101 55.59 8 -19.62014 1.00227 9 -12.00325 1.73539 5 1.59075 30.64 10 3187.75678 0.43092 11 -195.74271 2.27371 6 1.53101 55.59 12 -19.53196 2.73210 13 -93.61607 5.00 7 1.80831 46.50 14 -21.20471 15 ∞ .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.09572, A = -4.67537E-6,
B = 7.06477E-7, C = −4.61833E
-8, D = 8.38731E-10 Image-side lens surface (i = 12) of sixth lens K = -0.24701, A = 8.23679E-6,
B = -4.03579E-7, C = 7.96896E
-9, D = -5.52028E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 23.90174 3.80642 1 1.83930 37.34 2 44.82004 0.64244 3 16.65201 3.32774 2 1.77621 49.62 4 251.37445 2.00 3 1.65223 33.84 5 10.04293 5.93243 6 ∞ (diaphragm) 2.13896 7 -30.88803 1.50473 4 1.52833 57.41 8 -19.70954 0.99489 9 -12.05794 1.74330 5 1.58864 29.99 10 3202.28141 0.42178 11 -196.63458 2.28407 6 1.52833 57.41 12 -19.62095 2.72692 13 -93.61607 5.00 7 1.80831 46.50 14 -21.20471 15 ∞ .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.09572, A = -4.61204E-6,
B = 6.990599E-7, C = -4.47368E
-8, D = 8.005107E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.24701, A = 8.1522E-6,
B = -3.945509E-7, C = 7.71936E
-9, D = -5.29898E-11.

As described above, the sixth to tenth embodiments are described in claims 1 to 6.
It is an example of a reading lens belonging to Nos. 8 and 11, and the lens configurations of these examples are as shown in FIG. 17, and the fifth lens 5 as the “concave lens” is the “biconcave lens” and the sixth lens as the “convex lens”. The lens 6 is a “convex meniscus lens whose convex surface faces the image side”.

Example 11 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 21.79518 2.00 1 1.83930 37.34 2 41.32949 0.50 3 15.95482 3.56058 2 1.77621 49.62 4 174.54025 2.00 3 1.65223 33.84 5 9.40397 6.23130 6 ∞ (Aperture) 2.16952 7 -37.41754 1.50000 4 1.52833 56.15 8 -24.20852 1.00 9 -12.816245400000 5 1.58 0.50214 11 -87.59807 2.23461 6 1.52833 56.15 12 -17.84428 4.06321 13 -110.72697 5.00 7 1.77621 49.62 14 -22.26935 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.34450, A = 4.990785E-6,
B = 2.40048E-7, C = -2.24740E
-8, D = 3.58690E-10 Image-side lens surface (i = 12) of sixth lens K = 0.08292, A = 2.555528E-6,
B = -1.91358E-8, C = 9.38519E
-10, D = -2.10707E-12.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 21.79518 2.00 1 1.83930 37.34 2 41.32949 0.50 3 15.95482 3.56058 2 1.77621 49.62 4 174.54025 2.00 3 1.65223 33.84 5 9.40397 6.23130 6 ∞ (diaphragm) 2.17057 7 -37.36516 1.49790 4 1.53101 55.59 8 -24.17463 1.00210 9 -12.79830 1.49790 5 1.59075 30.64 10 -392.98952 0.50475 11 -87.47543 2.23149 6 1.53101 55.59 12 -17.81930 4.06477 13 -110.72697 15 5.00 7 1.77621 49.62 14 -22.2020 26935 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.34450, A = 4.99522E-6,
B = 2.41735E-7, C = -2.26955E
-8, D = 3.63241E-10 Image-side lens surface (i = 12) of sixth lens K = 0.08292, A = 2.56604E-6,
B = -1.92703E-8, C = 9.477768E
-10, D = -2.13381E-12.

High temperature state (65 degrees C) ir _i d _i j n _j ν _j 1 21.79518 2.00 1 1.83930 37.34 2 41.32949 0.50 3 15.95482 3.56058 2 1.77621 49.62 4 174.54025 2.00 3 1.65223 33.84 5 9.40397 6.23130 6 ∞ (diaphragm) 2.16716 7 -37.53451 1.50473 4 1.52232 57.41 8 -24.28478 0.99527 9 -12.85661 1.50473 5 1.58389 29.99 10 -394.78013 0.49625 11 -87.87400 2.24165 6 1.52232 57.41 12 -17.90049 4.05968 13 -110.72697 5.00 7 1.77621 49.62 14 -22.26935 15 ∞ ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.34450, A = 4.876176E-6,
B = 2.36303E-7, C = -2.19846E
-8, D = 3.48679E-10 Image-side lens surface of the sixth lens (i = 12) K = 0.08292, A = 2.53128E-6,
B = -1.888327E-8, C = 9.18083E
-10, D = -2.04827E-12.

Example 12 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 26.34297 2.43817 1 1.80831 36.50 2 46.37741 0.50 3 16.25409 4.24188 2 1.77621 49.62 4 93.72050 2.00 3 1.59666 35.45 5 9.80672 5.43833 6 ∞ (aperture) 3.05040 7 -46.46558 1.50000 4 1.52833 56.15 8 -23.40767 1.00 9 -12.04 301.51 44 5 0.20 11 -101.65369 3.47649 6 1.52833 56.15 12 -23.25041 1.27964 13 -93.03019 5.00 7 1.77621 49.62 14 -20.40882 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.01024, A = -1.72588E-5,
B = 3.63037E-7, C = -3.03259E
-8, D = 4.66301E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.77003, A = 1.07148E-5
B = -1.06633E-7, C = 2.8888E
-9, D = -172424E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 26.34297 2.43817 1 1.80831 36.50 2 46.37741 0.50 3 16.25409 4.24188 2 1.77621 49.62 4 93.72050 2.00 3 1.59666 35.45 5 9.80672 5.43833 6 ∞ (diaphragm) 3.05145 7 -46.40053 1.49790 4 1.53101 55.59 8 -23.37490 1.00210 9 -11.99087 1.49790 5 1.59075 30.64 10 -131.88471 0.20348 11 -101.51134 3.47162 6 1.53101 55.59 12 -23.21786 1.28207 13 -93.03019 5.00 7 1.77621 49.62 14 -20.40882 15 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.01024, A = -1.73315E-5,
B = 3.65589E-7, C = -3.06248E
-8, D = 4.72218E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.77003, A = 1.07599E-5
B = -1.07383E-7, C = 2.91706E
-9, D = -1.74606E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 26.34297 2.43817 1 1.80831 36.50 2 46.37741 0.50 3 16.25409 4.24188 2 1.77621 49.62 4 93.72050 2.00 3 1.59666 35.45 5 9.80672 5.43833 6 ∞ (diaphragm) 3.04804 7 -46.61195 1.50473 4 1.52232 57.41 8 -23.48140 0.99527 9 -12.04550 1.50473 5 1.58389 29.99 10 -132.48563 0.19216 11 -101.97386 3.48744 6 1.52232 57.41 12 -23.32365 1.27414 13 -93.03019 5.00 7 1.77621 49.62 14 -20.40882 15 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.01024, A = -1.70967E-5,
B = 3.57373E-7, C = -2.966656E
-8, D = 4.53287E-10 Image-side lens surface (i = 12) of sixth lens K = -0.77003, A = 1.06142E-5
B = -1.04969E-7, C = 2.82569E
-9, D = -1.67606E-11.

As described above, the eleventh and twelfth embodiments have the following features.
6 and 9 are examples of the reading lenses belonging to the present invention, and the lens configurations of these examples are as shown in FIG.
The fifth lens 5 as the “concave lens” and the sixth lens 6 as the “convex lens” are both “convex meniscus lenses with the convex surface facing the image side”.

Example 13 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 31.97215 2.00 1 1.83930 37.34 2 55.75244 1.23575 3 14.04126 2.81930 2 1.77621 49.62 4 102.58642 2.00 3 1.62409 36.30 5 9.84287 4.58161 6 ∞ (Aperture) 2.98273 7 -38.88688 1.50000 4 1.52833 56.15 8 -19.50683 1.00 9 -10.886496 3063.1058.9830 1.6289 3 11 242.37034 2.61333 6 1.52833 56.15 12 -20.10614 2.48698 13 -70.55947 2.06024 7 1.83930 37.34 14 -21.65309 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 2.30004, A = -2.25061E-5,
B = 6.79569E-7, C = -4.84245E
-8, D = 7.58671E-10 Image-side lens surface of the sixth lens (i = 12) K = 0.00363, A = 2.87579E-5
B = -3.19192E-7, C = 8.34179E
-9, D = -5.76061E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 31.97215 2.00 1 1.83930 37.34 2 55.75244 1.23575 3 14.04126 2.81930 2 1.77621 49.62 4 102.58642 2.00 3 1.62409 36.30 5 9.84287 4.58161 6 ∞ (diaphragm) 2.98378 7 -38.83244 1.49790 4 1.53101 55.59 8 -19.47952 1.00219 9 -10.58346 1.62665 5 1.59075 30.64 10 244.62111 0.29889 11 242.03102 2.60967 6 1.53101 55.59 12 -20.07799 2.48881 13 -70.55947 2.06024 7 1.83930 37.34 14 ∞.20.65309 15

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 2.30004, A = -2.26009E-5,
B = 6.84346E-7, C = -4.89017E
-8, D = 7.68297E-10 Image-side lens surface (i = 12) of sixth lens K = 0.00363, A = 2.887790E-5
B = -3.221436E-7, C = 8.42400E
-9, D = -5.83370E-11.

High temperature state (65 degrees C) ir _i d _i j n _j ν _j 1 31.97215 2.00 1 1.83930 37.34 2 55.75244 1.23575 3 14.04126 2.81930 2 1.77621 49.62 4 102.58642 2.00 3 1.62409 36.30 5 9.84287 4.58161 6 ∞ (diaphragm) 2.98037 7 -39.00937 1.50473 4 1.52232 57.41 8 -19.56828 0.99506 9 -10.63168 1.63406 5 1.58389 29.99 10 245.73570 0.28923 11 243.13381 2.62156 6 1.52232 57.41 12 -20.16947 2.48285 13 -70.55947 2.06024 7 0.73930 14

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 2.30004, A = -2.22948E-5,
B = 6.68966E-7, C = -4.73701E
-8, D = 7.37498E-10 Image-side lens surface (i = 12) of sixth lens K = 0.00363, A = 2.84898E-5
B = -3.14212E-7, C = 8.16015E
-9, D = -5.59984E-11.

Example 14 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 29.39780 2.00 1 1.83930 37.34 2 51.48050 0.50 3 15.84635 3.01808 2 1.77621 49.62 4 -794.54279 2.00 3 1.61686 36.96 5 10.74111 2.65914 6 ∞ (diaphragm) 3.14279 7 -30.51236 3.00 4 1.52833 56.15 8 -18.92362 1.00 9 -11.01965 2.388. 0.20 11 1846.87723 2.92443 6 1.52833 56.15 12 -19.10 0.73108 13 -60.73677 2.64790 7 1.83930 37.34 14 -22.61519 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.78629, A = -9.331632E-6,
B = 1.13709E-7, C = -9.99281E
-9, D = 1.16582E-10 Image-side lens surface (i = 12) of sixth lens K = -0.09942, A = 7.02496E-6,
B = -8.786672E-8, C = 1.68209E
-9, D = -1.00503E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 29.39780 2.00 1 1.83930 37.34 2 51.48050 0.50 3 15.84635 3.01808 2 1.77621 49.62 4 -794.54279 2.00 3 1.61686 36.96 5 10.74111 2.65914 6 ∞ (diaphragm) 3.14489 7 -30.46964 2.99580 4 1.53101 55.59 8 -18.89713 1.00374 9 -11.00422 2.33905 5 1.59075 30.64 10 2355.58675 0.20368 11 1844.29160 2.92034 6 1.53101 55.59 12 -19.07326 0.73313 13 -60.73677 2.64790 7 1.83930 37.34 14 -22. .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.78629, A = -9.355556E-6,
B = 1.14508E-7, C = -1.000268E
−8, D = 1.18061E-10 Image-side lens surface (i = 12) of sixth lens K = −0.09942, A = 7.05455E-6,
B = -8.84849E-8, C = 1.69867E
-9, D = -1.01778E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 29.39780 2.00 1 1.83930 37.34 2 51.48050 0.50 3 15.84635 3.01808 2 1.77621 49.62 4 -794.54279 2.00 3 1.61686 36.96 5 10.74111 2.65914 6 ∞ (diaphragm) 3.13807 7 -30.60847 3.00945 4 1.52232 57.41 8 -18.98323 0.99157 9 -11.00422 2.33905 5 1.58389 29.99 10 2366.31970 0.19169 11 1852.69489 2.93364 6 1.52232 57.41 12 -19.16017 0.72646 13 -60.73677 2.64790 7 1.83930 37.34 14 -22.615. .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.78629, A = -9.222883E-6,
B = 1.11935E-7, C = -9.71271E
-9, D = 1.13328E-10 Image-side lens surface (i = 12) of sixth lens K = -0.09942, A = 6.9589E-6,
B = -8.64963E-8, C = 1.64546E
-9, D = -9.76981E-12.

Example 15 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 30.18990 2.00 1 1.83930 37.34 2 52.61797 0.50 3 15.71788 3.10900 2 1.77621 49.62 4 -501.33754 2.00 3 1.61686 36.96 5 10.73509 2.80629 6 ∞ (aperture) 2.79156 7 -30.40762 3.00 4 1.52833 56.15 8 -18.93547 1.00 9 10-18864 2.3886 5 0.20 11 1637.91319 2.90937 6 1.52833 56.15 12 -19.08362 1.00263 13 -63.98091 2.60289 7 1.83930 37.34 14 -22.93538 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.84031, A = -1.08510E-5,
B = 1.22037E-7, C = -9.06789E
-9, D = 1.182182E-10 Image-side lens surface (i = 12) of sixth lens K = -0.11470, A = 7.49765E-6,
B = -9.181533E-8, C = 1.71771E
-9, D = -1.10291E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 30.18990 2.00 1 1.83930 37.34 2 52.61797 0.50 3 15.71788 3.10900 2 1.77621 49.62 4 -501.33754 2.00 3 1.61686 36.96 5 10.73509 2.80629 6 ∞ (diaphragm) 2.79366 7 -30.36505 2.99580 4 1.53101 55.59 8 -18.90896 1.00359 9 -10.98280 2.12688 5 1.59075 30.64 10 1758.91915 0.20353 11 1635.62011 2.90530 6 1.53101 55.59 12 -19.05690 1.00467 13 -63.98091 2.60289 7 1.83930 37.34 14 -22.9314 -22.93. .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.84031, A = -1.08967E-5
B = 1.22895E-7, C = -9.157726E
-9, D = 1.14618E-10 Image-side lens surface (i = 12) of sixth lens K = -0.11470, A = 7.52923E-6,
B = -9.222271E-8, C = 1.73464E
-9, D = -1.11690E-11.

High temperature state (65 degree C) ir _i d _i j j n _j ν _j 1 30.18990 2.00 1 1.83930 37.34 2 52.61797 0.50 3 15.71788 3.10900 2 1.77621 49.62 4 -501.33754 2.00 3 1.61686 36.96 5 10.73509 2.80629 6 ∞ (diaphragm) 2.78683 7 -30.50340 3.00945 4 1.52232 57.41 8 -18.99512 0.99191 9 -11.03284 2.13657 5 1.58389 29.99 10 1766.93345 0.19205 11 1643.07262 2.91853 6 1.52232 57.41 12 -19.14373 0.99804 13 -63.98091 2.60289 7 1.83930 37.34 14-22 -22. .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.84031, A = -1.07491E-5,
B = 1.20133E-7, C = -8.887044E
-9, D = 1.10023E-10 Image-side lens surface (i = 12) of sixth lens K = -0.11470, A = 7.442724E-6,
B = -9.01544E-8, C = 1.68031E
-9, D = -1.07213E-11.

Example 16 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 30.35689 2.00 1 1.81081 40.73 2 53.56777 0.50 3 15.78691 3.16323 2 1.77621 49.62 4 5827.21392 2.00 3 1.61686 36.96 5 10.81990 3.20245 6 ∞ (diaphragm) 2.41051 7 -28.95030 3.00 4 1.52833 56.15 8 -19.37849 1.00 9 -10.8663 3027 1.44. 11 -688.25149 2.65301 6 1.52833 56.15 12 -19.48629 0.22281 13 -57.68379 2.59226 7 1.83930 37.34 14 -19.98934 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.56782, A = -1.01679E-5,
B = 6.11502E-7, C = -2.64512E
-8, D = 4.36046E-10 Image-side lens surface (i = 12) of sixth lens K = -0.08696, A = 6.337545E-6,
B = -3.07561E-7, C = 5.35506E
-9, D = -4.21594E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 30.35689 2.00 1 1.81081 40.73 2 53.56777 0.50 3 15.78691 3.16323 2 1.77621 49.62 4 5827.21392 2.00 3 1.61686 36.96 5 10.81990 3.20245 6 ∞ (diaphragm) 2.41261 7 -28.90977 2.99580 4 1.53101 55.59 8 -19.35136 1.00315 9 -10.91533 1.49790 5 1.59075 30.64 10 575.90088 0.20291 11 -687.28794 2.64929 6 1.53101 55.59 12 -19.45901 0.22466 13 -57.68379 2.59226 7 1.83930 37.34 14 ∞-19.98934 15 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.56782, A = -1.02107E-5,
B = 6.15801E-7, C = -2.67449E
-8, D = 4.41579E-10 Image-side lens surface (i = 12) of sixth lens K = -0.08696, A = 6.403023E-6,
B = -3.09723E-7, C = 5.40784E
-9, D = -4.26944E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 30.35689 2.00 1 1.81081 40.73 2 53.56777 0.50 3 15.78691 3.16323 2 1.77621 49.62 4 5827.21392 2.00 3 1.61686 36.96 5 10.81990 3.20245 6 ∞ (diaphragm) 2.40579 7 -29.04149 3.00945 4 1.52232 57.41 8 -19.43953 0.99290 9 -10.96506 1.50473 5 1.58389 29.99 10 578.52490 0.19345 11 -690.41948 2.66136 6 1.52232 57.41 12 -19.54767 0.21861 13 -57.68379 259226 7 1.83930 37.34 14 ∞ 64.2098934 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.56782, A = -1.00724E-5,
B = 6.01961E-7, C = −2.58752E
-8, D = 4.23877E-10 Image-side lens surface (i = 12) of sixth lens K = -0.08696, A = 6.31558E-6,
B = -3.02762E-7, C = 5.23846E
-9, D = -4.09828E-11.

Example 17 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 28.49847 2.00 1 1.83930 37.34 2 47.85852 0.50 3 15.66333 3.45525 2 1.77621 49.62 4 204.92418 2.00 3 1.59666 36.30 5 10.35537 4.17186 6 ∞ (Aperture) 3.27675 7 -29.76567 2.62606 4 1.52833 56.15 8 -18.97759 1.00 9 -108864 30.44.44 5.44 11 254.78019 2.98323 6 1.52833 56.15 12 -18.56509 1.98693 13 -80.86461 2.90654 7 1.83930 37.34 14 -23.37331 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.26104, A = −2.16540E-5,
B = 2.66487E-8, C = -1.59724E
-8, D = 1.63193E-10 Image-side lens surface (i = 12) of sixth lens K = -0.34601, A = 1.30329E-5
B = -5.90084E-8, C = 2.73004E
-9, D = -1.43635E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 28.49847 2.00 1 1.83930 37.34 2 47.85852 0.50 3 15.66333 3.45525 2 1.77621 49.62 4 204.92418 2.00 3 1.59666 36.30 5 10.35537 4.17186 6 ∞ (diaphragm) 3.27859 7 -29.72 400 2.62238 4 1.53101 55.59 8 -18.95102 1.00289 9 -10.66123 1.49790 5 1.59075 30.64 10 440.02894 0.20314 11 254.42350 2.97905 6 1.53101 55.59 12 -18.53910 1.98902 13 -80.86461 2.90654 7 1.83930 37.34 14 ∞.20.37331 15 654.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.26104, A = −2.17452E-5,
B = 2.68360E-8, C = -1.61298E
-8, D = 1.65264E-10 Image-side lens surface (i = 12) of sixth lens K = -0.34601, A = 1.30878E-5
B = -5.99422E-8, C = 2.75695E
-9, D = -1.45458E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 28.49847 2.00 1 1.83930 37.34 2 47.85852 0.50 3 15.66333 3.45525 2 1.77621 49.62 4 204.92418 2.00 3 1.59666 36.30 5 10.35537 4.17186 6 ∞ (diaphragm) 3.27262 7 -29.85943 2.63433 4 1.52232 57.41 8 -19.03737 0.99349 9 -10.70981 1.50473 5 1.58389 29.99 10 442.03387 0.19293 11 255.58275 2.99263 6 1.52232 57.41 12 -18.62357 1.98222 13 -80.86461 2.90654 7 1.83930 37.34 14 -23.20316 31 187.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 1.26104, A = −2.14507E-5,
B = 2.62329E-8, C = -1.56246E
-8, D = 1.58639E-10 Image-side lens surface (i = 12) of sixth lens K = -0.34601, A = 1.29105E-5
B = -5.808877E-8, C = 2.67059E
-9, D = -1.39626E-11.

As described above, Examples 13 to 17 have the following features.
It is an example of the reading lens belonging to 4, 13, 14. FIG. 40 shows the lens configuration of the reading lens according to claim 13, wherein the fifth lens 5 as the “concave lens” and the convex lens 6 as the “convex lens” are both “meniscus lenses with the convex surface facing the image side”. .

Example 18 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 22.12180 2.74187 1 1.80831 46.50 2 37.05395 0.50 3 16.36823 3.78174 2 1.77621 46.50 4 67.80957 2.00 3 1.59666 35.45 5 9.37469 6.12884 6 ∞ (aperture) 2.96972 7 -48.37288 1.50 4 1.52833 56.15 8 -27.02370 1.00 9 -14.07169 1.5988 11 1092.74607 2.00180 6 1.52833 56.15 12 -32.67021 2.31570 13 -82.86322 3.83697 7 1.77621 46.50 14 -17.12676 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -1.723779, A = 4.75246E-6,
B = 1.13989E-6, C = -5.11095E
-8, D = 8.550641E-10 Image-side lens surface (i = 12) of sixth lens K = -0.17593, A = 1.36354E-5
B = -4.15259E-7, C = 7.81503E
-9, D = -5.79132E-11.

Cold state (0 degree C) i r _i d _i j _j j _j ν _j 1 22.12180 2.74187 1 1.80831 46.50 2 37.05395 0.50 3 16.36823 3.78174 2 1.77621 46.50 4 67.80957 2.00 3 1.59666 35.45 5 9.37469 6.12884 6 ∞ (diaphragm) 2.97077 7 -48.30516 1.49790 4 1.53101 55.59 8 -26.98587 1.00217 9 -14.05149 1.59657 5 1.59075 30.64 10 169.44604 0.20252 11 1091.21623 1.99900 6 1.53101 55.59 12 -32.62447 2.31710 13 -82.86322 3.83697 7 1.77621 46.50 14 -17.20 16187 ∞ 18.016 1572

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -1.723739, A = 4.777248E-6,
B = 1.14790E-6, C = -5.161632E
-8, D = 8.61435E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.17593, A = 1.36928E-5
B = -4.18178E-7, C = 7.89205E
−9, D = −5.864480E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 22.12180 2.74187 1 1.80831 46.50 2 37.05395 0.50 3 16.36823 3.78174 2 1.77621 46.50 4 67.80957 2.00 3 1.59666 35.45 5 9.37469 6.12884 6 ∞ (diaphragm) 2.96736 7 -48.52526 1.50473 4 1.52232 57.41 8 -27.10883 0.99511 9 -14.11551 1.60384 5 1.58389 29.99 10 170.21810 0.19432 11 1096.18822 2.00811 6 1.52232 57.41 12 -32.77313 2.31254 13 -82.86322 3.83697 7 1.77621 46.50 14 -17.12 676 15 ∞ 7.60

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -1.72379, A = 4.70783E-6,
B = 1.12211E-6, C = -4.99966E
-8, D = 8.26901E-10 Image-side lens surface (i = 12) of sixth lens K = -0.17593, A = 1.35074E-5
B = -4.0780E-7, C = 7.64486E
-9, D = -5.62969E-11.

Example 19 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 23.31616 2.64866 1 1.80831 37.34 2 39.08249 0.50 3 16.21685 3.91076 2 1.77621 49.62 4 78.38528 2.00 3 1.59666 36.96 5 9.56422 6.05415 6 ∞ (diaphragm) 3.22065 7 -47.19316 1.50 4 1.52833 56.15 8 -28.44874 1.00 9 10-14.49243 1.50 11 685.86688 2.00180 6 1.52833 56.15 12 -34.32296 2.32422 13 -106.16540 4.05544 7 1.77621 44.54 14 -17.35395 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -3.83175, A = 1.07053E-5,
B = 8.93822E-7, C = -3.05701E
-8, D = 5.39765E-10 Image-side lens surface (i = 12) of sixth lens K = 1.05230, A = 7.81250E-6,
B = -2.87128E-7, C = 4.885856E
-9, D = -4.24083E-11.

Cold state (0 degree C) ir _i d _i j j n _j ν _j 1 23.31616 2.64866 1 1.80831 37.34 2 39.08249 0.50 3 16.21685 3.91076 2 1.77621 49.62 4 78.38528 2.00 3 1.59666 36.96 5 9.56422 6.05415 6 ∞ (diaphragm) 3.22170 7 -47.12709 1.49790 4 1.53101 55.59 8 -28.40891 1.00210 9 -14.47214 1.49790 5 1.59075 30.64 10 109.22784 0.20245 11 684.90667 1.99900 6 1.53101 55.59 12 -34.27491 2.32562 13 -106.16540 4.05544 7 1.77621 44.54 14 ∞.2035 395 15 15

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -3.83175, A = 1.07504E-5,
B = 9.00105E-7, C = -3.08714E
-8, D = 5.46614E-10 Image-side lens surface of the sixth lens (i = 12) K = 1.05230, A = 7.84541E-6,
B = -2.89146E-7, C = 4.909044E
-9, D = -4.29464E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 23.31616 2.64866 1 1.80831 37.34 2 39.08249 0.50 3 16.21685 3.91076 2 1.77621 49.62 4 78.38528 2.00 3 1.59666 36.96 5 9.56422 6.05415 6 ∞ (diaphragm) 3.21829 7 -47.34182 1.50473 4 1.52232 57.41 8 -28.53835 0.99527 9 -14.53808 1.50473 5 1.58389 29.99 10 109.72552 0.19448 11 688.02736 2.00811 6 1.52232 57.41 12 -34.43108 2.32106 13 -106.16540 4.05544 7 1.77621 44.54 14 ∞.17.35395 15 15

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -3.83175, A = 1.06048E-5,
B = 8.79876E-7, C = -2.99044E
-8, D = 5.24701E-10 Image-side lens surface (i = 12) of sixth lens K = 1.05230, A = 7.773913E-6,
B = -2.82648E-7, C = 4.75277E
-9, D = -4.12247E-11.

Example 20 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 25.84342 3.36367 1 1.80831 37.34 2 44.76520 0.50 3 16.20726 3.94755 2 1.77621 49.62 4 104.05320 2.00 3 1.59666 36.96 5 9.88810 5.75053 6 ∞ (aperture) 2.93764 7 -47.75746 1.50 4 1.52833 56.15 8 -28.22960 1.00 9 -14.70425 3.30 11 2827.90147 2.00180 6 1.52833 56.15 12 -34.26843 2.05553 13 -193.58691 5.00 7 1.77621 49.62 14 -19.04943 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -2.99076, A = 6.12118E-6,
B = 8.1004E-7, C = -3.25848E
-8, D = 6.077789E-10 Image-side lens surface (i = 12) of sixth lens K = 0.81307, A = 8.39499E-6,
B = -2.55291E-7, C = 4.18738E
-9, D = -3.4423E-11.

Cold state (0 degree C) i r _i d _i j n _j ν _j 1 25.84342 3.36367 1 1.80831 37.34 2 44.76520 0.50 3 16.20726 3.94755 2 1.77621 49.62 4 104.05320 2.00 3 1.59666 36.96 5 9.88810 5.75053 6 ∞ (diaphragm) 2.93869 7 -47.69060 1.49790 4 1.53101 55.59 8 -28.19008 1.00266 9 -14.68366 2.29926 5 1.59075 30.64 10 100.49513 0.20301 11 2823.94241 1.99900 6 1.53101 55.59 12 -34.22045 2.05693 13 -193.58691 15 ∞-19.020 816 3

Aspheric surface Image-side lens surface of fourth lens (i = 8) K = -2.99076, A = 6.14696E-6,
B = 8.17712E-7, C = -3.29059E
-8, D = 6.15501E-10 Image-side lens surface (i = 12) of sixth lens K = 0.81307, A = 8.43035E-6,
B = -2.57086E-7, C = 4.22865E
-9, D = -3.46768E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 25.84342 3.36367 1 1.80831 37.34 2 44.76520 0.50 3 16.20726 3.94755 2 1.77621 49.62 4 104.05320 2.00 3 1.59666 36.96 5 9.88810 5.75053 6 ∞ (diaphragm) 2.93528 7 -47.90790 1.50473 4 1.52232 57.41 8 -28.31852 0.99400 9 -14.75057 2.30974 5 1.58389 29.99 10 100.95302 0.19321 11 2836.80936 2.00811 6 1.52232 57.41 12 -34.37638 2.05237 13 -193.58691 5.00 7 1.77621 49.62 14 -19.04 9415 15 ∞

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -2.99076, A = 6.06370E-6,
B = 7.99335E-7, C = -3.18753E
-8, D = 5.90827E-10 Image-side lens surface (i = 12) of sixth lens K = 0.81307, A = 8.331616E-6,
B = -2.51308E-7, C = 4.09620E
-9, D = -3.32867E-11.

As described above, Examples 18 to 20 have the following features.
It is an example of the reading lens described in 2, 15-18. As shown in FIG. 56 showing a typical lens configuration, the fifth lens 5 as a “concave lens” is a biconcave lens or a “convex lens”.
The sixth lens 6 is a biconvex lens.

Example 21 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 25.72743 2.68554 1 1.80831 37.34 2 46.21494 0.50 3 17.59516 5.20424 2 1.77621 49.62 4 120.22645 2.00 3 1.59666 36.96 5 9.85333 5.52230 6 ∞ (Aperture) 2.63340 7 -31.37129 1.50 4 1.52833 56.15 8 -19.86498 1.00 9 10-128.54 690 1.44 11 -121.13627 2.18955 6 1.52833 56.15 12 -20.22450 3.26891 13 -92.91503 4.73502 7 1.77621 37.34 14 -19.53690 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.55636, A = 6.63114E-6,
B = 1.02385E-6, C = -4.98021E
-8, D = 9.27047E-10 Image-side lens surface (i = 12) of sixth lens K = 0.03143, A = 1.56598E-6,
B = -3.32051E-7, C = 6.61976E
-9, D = -5.91832E-11.

Cold state (0 degree C) ir _i d _i j n _j ν _j 1 25.72743 2.68554 1 1.80831 37.34 2 46.21494 0.50 3 17.59516 5.20424 2 1.77621 49.62 4 120.22645 2.00 3 1.59666 36.96 5 9.85333 5.52230 6 ∞ (diaphragm) 2.63445 7 -31.32737 1.49790 4 1.53101 55.59 8 -19.83717 1.00210 9 -12.67701 1.49790 5 1.59075 30.64 10 1266.75017 0.20258 11 -120.96668 2.18649 6 1.53101 55.59 12 -20.19619 3.27044 13 -92.91503 4.73502 7 1.77621 37.34 14 ∞.192053690 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.55636, A = 6.65907E-6,
B = 1.03105E-6, C = -5.02929E
-8, D = 9.38810E-10 Image-side lens surface of the sixth lens (i = 12) K = 0.03143, A = 1.57258E-6,
B = -3.34385E-7, C = 6.68500E
-9, D = -5.99922E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 25.72743 2.68554 1 1.80831 37.34 2 46.21494 0.50 3 17.59516 5.20424 2 1.77621 49.62 4 120.22645 2.00 3 1.59666 36.96 5 9.85333 5.52230 6 ∞ (diaphragm) 2.63103 7 -31.47011 1.50473 4 1.52232 57.41 8 -19.92756 0.99527 9 -12.73477 1.50473 5 1.58389 29.99 10 1272.52197 0.19418 11 -120.96668 2.18649 6 1.52232 57.41 12 -20.28821 3.26545 13 -92.91503 4.73502 7 1.77621 37.34 14 ∞-19.53690 1572 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.55636, A = 6.56887E-6,
B = 1.00788E-6, C = -4.87177E
-8, D = 9.01174E-10 Image-side lens surface of the sixth lens (i = 12) K = 0.03143, A = 1.55127E-6,
B = -3.26870E-7, C = 6.47562E
-9, D = -5.75315E-11.

Example 22 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 29.63707 2.53920 1 1.80831 46.50 2 53.84120 0.50 3 17.37137 5.55322 2 1.77621 49.62 4 141.10831 2.00 3 1.59666 35.45 5 10.08769 5.76562 6 ∞ (diaphragm) 2.93686 7 -30.02988 1.50 4 1.52833 56.15 8 -20.57768 1.00 9 -12.8861 436 1.671 10.5814 11 -116.91731 2.26828 6 1.52833 56.15 12 -19.75383 2.70223 13 -107.59545 4.89326 7 1.77621 49.62 14 -19.84941 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of fourth lens (i = 8) K = 0.0, A = 2.15841E-5, B =
9.16429E-7, C = -3.70189E-8,
D = 6.85697E-10 Image-side lens surface of sixth lens (i = 12) K = -1.0, A = -1.89300E-5, B =-
2.73169E-7, C = 4.42189E-9,
D = -4.38198E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 29.63707 2.53920 1 1.80831 46.50 2 53.84120 0.50 3 17.37 137 5.55322 2 1.77621 49.62 4 141.10831 2.00 3 1.59666 35.45 5 10.08769 5.76562 6 ∞ (diaphragm) 2.93791 7 -29.98784 1.49790 4 1.53101 55.59 8 -20.54887 1.00222 9 -12.79642 1.66879 5 1.59075 30.64 10 879.98079 0.20276 11 -116.75363 2.26511 6 1.53101 55.59 12 -19.72618 2.70381 13 -107.59545 4.89326 7 1.77621 49.62 14 ∞-19.80 941 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.0, A = 2.16750E-5, B =
9.22871E-7, C = -3.73837E-8,
D = 6.994398E-10 Image-side lens surface (i = 12) of sixth lens K = -1.0, A = -1.90097E-5, B =-
2.75089E-7, C = 4.446547E-9,
D = -4.43758E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 29.63707 2.53920 1 1.80831 46.50 2 53.84120 0.50 3 17.37 137 5.55322 2 1.77621 49.62 4 141.10831 2.00 3 1.59666 35.45 5 10.08769 5.76562 6 ∞ (diaphragm) 2.93450 7 -30.12447 1.50473 4 1.52232 57.41 8 -20.64250 0.99500 9 -12.85473 1.67639 5 1.58389 29.99 10 883.99032 0.19379 11 -117.28560 2.27543 6 1.52232 57.41 12 -19.81606 2.69846 13 -107.59545 4.89326 7 1.77621 49.62 14 ∞-19.8401 .

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.0, A = 2.13814E-5, B =
9.02131E-7, C = -3.62128E-8,
D = 6.662560-10 Image-side lens surface (i = 12) of sixth lens K = -1.0, A = -1.87522E-5, B =-
2.68907E-7, C = 4.32560E-9,
D = -4.25969E-11.

As described above, Examples 21 to 22 are defined by
It is an example of the reading lens described in 2, 15, 16, 19, and 20. As shown in FIG. 66 showing a typical lens configuration, the fifth lens 5 as a “concave lens” is a biconcave lens,
The sixth lens 6 as a “convex lens” is a convex meniscus lens with the convex surface facing the image side.

Example 23 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 22.43198 2.00 1 1.83930 37.34 2 43.41391 1.56085 3 16.20254 3.19540 2 1.77621 49.62 4 207.04652 2.00 3 1.65223 33.84 5 9.70741 5.73451 6 ∞ (Aperture) 1.96710 7 -32.86726 1.50 4 1.52833 56.15 8 -20.02011 1.00 9 -12.65996 309544 595391 0.48760 11 -118.78112 2.15389 6 1.52833 56.15 12 -20.22923 2.90951 13 -84.05636 5.00 7 1.80831 49.62 14 -21.40061 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.28138, A = 6.1146E-7,
B = 8.35291E-7, C = -4.95111E
-8, D = 9.22680E-10 Image-side lens surface (i = 12) of sixth lens K = 0.04085, A = 1.02296E-6,
B = -2.64857E-7, C = 4.74913E
-9, D = -3.60761E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 22.43198 2.00 1 1.83930 37.34 2 43.41391 1.56085 3 16.20254 3.19540 2 1.77621 49.62 4 207.04652 2.00 3 1.65223 33.84 5 9.70741 5.73451 6 ∞ (diaphragm) 1.96815 7 -32.82125 1.49790 4 1.53101 55.59 8 -19.99208 1.00242 9 -12.64224 1.95117 5 1.59075 30.64 10 -4731.17909 0.49048 11 -118.61483 2.15087 6 1.53101 55.59 12 -20.20091 2.91102 13 -84.05636 5.00 7 1.80831 49.62 14 -21.40061 15 ∞ 7 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.28138, A = 6.14021E-7,
B = 8.41163E-7, C = -4.99990E
-8, D = 9.34388E-10 Image-side lens surface of the sixth lens (i = 12) K = 0.04085, A = 1.02727E-6,
B = -2.66719E-7, C = 4.79593E
-9, D = -3.65339E-11.

High temperature state (65 degrees C) ir _i d _i j n _j ν _j 1 22.43198 2.00 1 1.83930 37.34 2 43.41391 1.56085 3 16.20254 3.19540 2 1.77621 49.62 4 207.04652 2.00 3 1.65223 33.84 5 9.70741 5.73451 6 ∞ (diaphragm) 1.96474 7 -32.97079 1.50473 4 1.52232 57.41 8 -20.08317 0.99455 9 -12.69984 1.96006 5 1.58389 29.99 10 -4752.73614 0.48112 11 -119.15528 2.16067 6 1.52232 57.41 12 -20.29295 2.90611 13 -84.05636 5.00 7 1.80831 49.62 14 -21.40061 15 ∞ 7 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.28138, A = 6.05704E-7,
B = 8.22259E-7, C = -4.84330E
-8, D = 8.996920E-10 Image-side lens surface (i = 12) of sixth lens K = 0.04085, A = 1.01335E-6,
B = -2.60725E-7, C = 4.64572E
-9, D = -3.50693E-11.

Example 24 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 23.07116 2.00 1 1.83930 37.34 2 43.34816 1.97877 3 15.93157 3.15315 2 1.77621 49.62 4 182.71814 2.00 3 1.65223 33.84 5 9.67441 5.65836 6 ∞ (aperture) 2.25903 7 -36.33177 1.50 4 1.52833 56.15 8 -20.51629 1.00 9 -10.88.35 3044. 0.54527 11 -90.15934 2.24454 6 1.52833 56.15 12 -20.97105 3.04726 13 -83.99577 2.52139 7 1.80831 46.50 14 -21.16521 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.421515, A = 3.38886E-6,
B = 4.48132E-7, C = -3.35798E
-8, D = 6.47932E-10 Image-side lens surface (i = 12) of sixth lens K = 0.00159, A = 3.27293E-6,
B = -3.54512E-7, C = 5.56044E
-9, D = -3.48109E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 23.07116 2.00 1 1.83930 37.34 2 43.34816 1.97877 3 15.93157 3.15315 2 1.77621 49.62 4 182.71814 2.00 3 1.65223 33.84 5 9.67441 5.65836 6 ∞ (diaphragm) 2.26008 7 -36.28091 1.49790 4 1.53101 55.59 8 -20.48757 1.00315 9 -12.73250 2.99580 5 1.59075 30.64 10 -424.34390 0.54894 11 -90.03312 2.24140 6 1.53101 55.59 12 -20.94169 3.04883 13 -83.99577 2.52139 7 1.80831 46.50 14 ∞-21.16521 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.421515, A = 3.4313E-6,
B = 4.51282E-7, C = -3.39107E
-8, D = 6.563153E-10 Image-side lens surface (i = 12) of sixth lens K = 0.00159, A = 3.28672E-6,
B = -3.57004E-7, C = 5.61524E
-9, D = -3.52526E-11.

High temperature state (65 degrees C) ir _i d _i j j n _j ν _j 1 23.07116 2.00 1 1.83930 37.34 2 43.34816 1.97877 3 15.93157 3.15315 2 1.77621 49.62 4 182.71814 2.00 3 1.65223 33.84 5 9.67441 5.65836 6 ∞ (diaphragm) 2.25667 7 -36.44622 1.50473 4 1.52232 57.41 8 -20.58092 0.99291 9 -12.79051 3.00945 5 1.58389 29.99 10 -426.27737 0.53700 11 -90.44334 2.25161 6 1.52232 57.41 12 -21.03711 3.04372 13 -83.99577 2.52139 7 1.80831 46.50 14 ∞-21.16521 21 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = -0.421515, A = 3.35704E-6,
B = 4.411140-7, C = −3.28486E
-8, D = 6.29849E-10 Image-side lens surface (i = 12) of sixth lens K = 0.00159, A = 3.22420E-6,
B = -3.48981E-7, C = 5.43936E
-9, D = -3.38394E-11.

Example 25 Standard state (20 degrees C) f = 43.2 mm, F / No = 4.0, m = 0.102, ω = 19.3 degrees i r _i d _i j n _j v _j 1 27.45171 2.00 1 1.83930 37.34 2 44.71904 0.20 3 15.49272 3.30743 2 1.77621 49.62 4 943.39803 2.00 3 1.61686 36.30 5 10.12900 5.47250 6 ∞ (aperture) 2.03745 7 -29.14653 2.86488 4 1.52833 56.15 8 -19.33503 1.00 9 -10.8863.23.44 5. 0.38412 11 -273.80450 2.45951 6 1.52833 56.15 12 -19.39939 3.20433 13 -59.00743 2.30970 7 1.81986 46.50 14 -19.90071 15 ∞ 0.70 8 1.51872 64.20 16 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.06233, A = -6.56756E-7,
B = 6.16816E-7, C = -3.06913E
-8, D = 5.24019E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.07433, A = 4.47315E-6,
B = -1.73407E-7, C = 3.47606E
-9, D = -2.73920E-11.

Cold state (0 degree C) i r _i d _i j j n _j ν _j 1 27.45171 2.00 1 1.83930 37.34 2 44.71904 0.20 3 15.49272 3.30743 2 1.77621 49.62 4 943.39803 2.00 3 1.61686 36.30 5 10.12900 5.47250 6 ∞ (diaphragm) 2.03945 7 -29.10573 2.86087 4 1.53101 55.59 8 -19.30796 1.00305 9 -11.60765 1.49790 5 1.59075 30.64 10 -1771.75101 0.38689 11 -273.42117 2.45607 6 1.53101 55.59 12 -19.37223 3.20605 13 -59.00743 15.30970 7 1.81986 46.50 14 -0720 ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.06233, A = -6.59522E-7,
B = 6.21152E-7, C = -3.09938E
-8, D = 5.30668E-10 Image-side lens surface of the sixth lens (i = 12) K = -0.07433, A = 4.49199E-6,
B = -1.74626E-7, C = 3.51032E
-9, D = -2.77396E-11.

High temperature state (65 degrees C) ir _i d _i j _j j _j v _j 1 27.45171 2.00 1 1.83930 37.34 2 44.71904 0.20 3 15.49272 3.30743 2 1.77621 49.62 4 943.39803 2.00 3 1.61686 36.30 5 10.12900 5.47250 6 ∞ (diaphragm) 2.03294 7 -29.23834 2.87390 4 1.52232 57.41 8 -19.39594 0.99311 9 -11.66054 1.50473 5 1.58389 29.99 10 -1779.82378 0.37787 11 -273.66698 2.46726 6 1.52232 57.41 12 -19.46050 3.20045 13 -59.00743 2.30970 7 1.81986 46.50 14 -19.90071 152 8∞ ∞.

Aspheric surface Image-side lens surface of the fourth lens (i = 8) K = 0.06233, A = -6.50589E-7,
B = 6.07192E-7, C = -3.00230E
-8, D = 5.09394E-10 Image-side lens surface (i = 12) of sixth lens K = -0.07433, A = 4.43114E-6,
B = -1.70702E-7, C = 3.40037E
-9, D = -2.666275E-11.

As described above, the twenty-third embodiments are described in claims 1, 2,
It is an example of the reading lens described in 15, 16, 21, and 22. As shown in FIG. 73 showing a typical lens configuration,
The fifth lens 5 as a “concave lens” is a concave meniscus lens having a convex surface facing the image side, and the sixth lens 6 as a “convex lens” is a convex meniscus lens having a convex surface facing the image side.

In the following, the focal lengths of the entire system at the standard temperature, low temperature state and high temperature state of Examples 1 to 25: f (e
(Line) values are shown as a list.

Examples Standard state (20 degrees C) Low temperature state (0 degrees C) High temperature state (65 degrees C) 1 43.2 43.159 43.291 2 43.2 43.131 43.356 3 43.2 43.226 43.139 4 43.2 43.181 43.225 5 43.2 43.217 43.163 6 43.2 43.196 43.209 7 43.2 43.180 43.246 8 43.2. 43.185 43.231 9 43.2 43.192 43.225 10 43.2 43.183 43.177 11 43.2 43.183 43.243 12 43.2 43.199 43.202 13 43.2. 43.174 43.254 14 43.2 43.163 43.282 15 43.2 43.166 43.275 16 43.2 43.194 43.201 17 43.2 43.169 43.268 18 43.2 43.234 43.124 19 43.2 43.246 43.097 20 43.2 43.243 43.103 21 43.2 43.195. 43.210 22 43.2 43.198 43.205 23 43.2 43.188 43.228 24 43.2 43.185 43.233 25 43.2 43.181 43.240.

Next, the values of the parameters of each conditional expression relating to Examples 1 to 25 are shown as a list. In this list,
P1 = f ₁ / f, P2 = f ₂₆ / f, P3 = f ₄ / f ₅₆ , P
4 = n (convex) -n (concave), P5 = ν (convex) -ν (concave).

Example P1 P2 P3 P4 P5 1 1.89 -2.28 -1.72 0.11 15.10 2 1.67 -3.36 -1.16 0.09 13.95 3 1.58 -1.05 -2.81 0.11 17.33 4 1.70 -1.67 -2.25 0.10 15.45 5 1.75 -1.19 -2.41 0.11 17.41 6 1.97 -1.66 -2.24 0.10 15.06 7 1.83 -1.59 -1.80 0.09 16.08 8 1.79 -1.99 -2.02 0. 10 14.75 9 1.77 -1.80 -2.18 0.09 15.78 10 1.30 -1.17 -2.06 0.08 17.01 11 1.21 -1.22 -2 .13 0.07 17.64 12 1.66 -1.53 -2.02 0.09 18 66 13 1.99 -2.30 -1.80 0.09 13.95 14 1.82 -2.59 -1.77 0.10 13.62 15 1.88 -2.71 -1.810 .10 13.62 16 1.93 -1.81 -2.43 0.10 14.30 17 1.86 -2.50 -1.92 0.11 14.37 18 1.45 -0.90- 3.05 0.09 18.66 19 1.54 -0.91 -3.74 0.09 18.66 20 1.62 -1.03 -3.65 0.09 18.66 21 1.57- 1.33 -2.16 0.09 18.66 22 1.80 -1.54 -2.47 0.09 18.66 23 1.23 -1.15 -1.96 0.08 17.01 24 1.30 -1.22 -1.84 0.08 17.01 25 1.86 -1.96-2.07 0.10 15.06.

2 to 16 in order, the standard state (20 degrees C) and the low temperature state (0 degrees C) for each of Examples 1 to 5
3A and 3B show aberration diagrams in a high temperature state (65 degrees C).

18 to 32 are aberration charts in the standard state, the low temperature state and the high temperature state relating to Examples 6 to 10, respectively. 34 to 39, the eleventh embodiment,
12A and 12B are aberration charts in a standard state, a low temperature state, and a high temperature state regarding each of 12 items.

Examples 13 to 17 are sequentially shown in FIGS.
The aberration charts in the standard state, the low temperature state, and the high temperature state for each of the above are shown.

57 to 65 are sequentially shown in Examples 18 to 20.
The aberration charts in the standard state, the low temperature state, and the high temperature state for each of the above are shown.

67 to 72 are aberration charts in the standard state, the low temperature state and the high temperature state relating to Examples 21 and 22, respectively.

74 to 82 are sequentially shown in Examples 23 to 25.
The aberration charts in the standard state, the low temperature state, and the high temperature state for each of the above are shown.

In these aberration diagrams, "SA" is spherical aberration (solid line), "SC" is sine condition (dashed line), "As".
"t" is astigmatism, "Dist" is distortion, and "Com"
“A” indicates coma. The solid line in the diagram of astigmatism indicates the sagittal ray, and the broken line indicates the meridional ray.

Also, is the e-line (546.07 nm),
Is c-line (656.27 nm), is F-line (486.13)
nm) ray.

[0224]

As described above, according to the present invention, a novel reading lens can be provided. The reading lens of the present invention can be realized at low cost because it includes three inexpensive plastic lenses.
Further, despite the use of the plastic lens, there is little fluctuation in the focal length due to temperature changes, and as is apparent from the above-mentioned examples, F / No: 4.0 and large aperture, half angle of view:
Wide angle of view of about 20 degrees, high efficiency is close to 100%,
The contrast in the high spatial frequency region is also high.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic lens configuration of Examples 1 to 5.

FIG. 2 is an aberration diagram for Example 1 at room temperature.

FIG. 3 is an aberration diagram for Example 1 at a low temperature.

FIG. 4 is an aberration diagram for Example 1 at a high temperature.

FIG. 5 is an aberration diagram for Example 2 at room temperature.

FIG. 6 is an aberration diagram for Example 2 at a low temperature.

FIG. 7 is an aberration diagram for Example 2 at a high temperature.

FIG. 8 is an aberration diagram for Example 3 at room temperature.

FIG. 9 is an aberration diagram for Example 3 at a low temperature.

FIG. 10 is an aberration diagram for Example 3 at a high temperature.

FIG. 11 is an aberration diagram for Example 4 at room temperature.

FIG. 12 is an aberration diagram for Example 4 at a low temperature.

FIG. 13 is an aberration diagram for Example 4 at a high temperature.

FIG. 14 is an aberration diagram for Example 5 at room temperature.

FIG. 15 is an aberration diagram for Example 5 at a low temperature.

FIG. 16 is an aberration diagram for Example 5 at a high temperature.

FIG. 17 is a diagram showing a basic lens configuration according to Examples 6 to 10.

FIG. 18 is an aberration diagram for Example 6 at room temperature.

FIG. 19 is an aberration diagram for Example 6 at a low temperature.

FIG. 20 is an aberration diagram for Example 6 at a high temperature.

FIG. 21 is an aberration diagram for Example 7 at room temperature.

FIG. 22 is an aberration diagram for Example 7 at a low temperature.

FIG. 23 is an aberration diagram for Example 7 at a high temperature.

FIG. 24 is an aberration diagram for Example 8 at room temperature.

FIG. 25 is an aberration diagram for Example 8 at a low temperature.

FIG. 26 is an aberration diagram for Example 8 at a high temperature.

FIG. 27 is an aberration diagram of Example 9 at room temperature.

FIG. 28 is an aberration diagram for Example 9 at a low temperature.

FIG. 29 is an aberration diagram for Example 9 at a high temperature.

FIG. 30 is an aberration diagram for Example 10 at room temperature.

FIG. 31 is an aberration diagram for Example 10 at a low temperature.

FIG. 32 is an aberration diagram for Example 10 at a high temperature.

FIG. 33 is a diagram showing a basic lens configuration of Examples 11 and 12;

FIG. 34 is an aberration diagram of Example 11 at room temperature.

FIG. 35 is an aberration diagram for Example 11 at a low temperature.

FIG. 36 is an aberration diagram for Example 11 at a high temperature.

FIG. 37 is an aberration diagram of Example 12 at room temperature.

FIG. 38 is an aberration diagram for Example 12 at a low temperature.

FIG. 39 is an aberration diagram for Example 12 at a high temperature.

FIG. 40 is a diagram showing a basic lens configuration according to Examples 13 to 17;

FIG. 41 is an aberration diagram for Example 13 at room temperature.

FIG. 42 is an aberration diagram for Example 13 at a low temperature.

FIG. 43 is an aberration diagram for Example 13 at a high temperature.

FIG. 44 is an aberration diagram of Example 14 at room temperature.

FIG. 45 is an aberration diagram for Example 14 at a low temperature.

FIG. 46 is an aberration diagram for Example 14 at a high temperature.

FIG. 47 is an aberration diagram of Example 15 at room temperature.

FIG. 48 is an aberration diagram for Example 15 at a low temperature.

FIG. 49 is an aberration diagram for Example 15 at a high temperature.

50 is an aberration diagram of Example 16 at normal temperature. FIG.

FIG. 51 is an aberration diagram of Example 16 at a low temperature.

52 is an aberration diagram for Example 16 at a high temperature. FIG.

FIG. 53 is an aberration diagram of Example 17 at room temperature.

FIG. 54 is an aberration diagram of Example 17 at a low temperature.

FIG. 55 is an aberration diagram of Example 17 at a high temperature.

FIG. 56 is a diagram showing a basic lens configuration according to Examples 18 to 20.

FIG. 57 is an aberration diagram of Example 18 at room temperature.

FIG. 58 is an aberration diagram of Example 18 at a low temperature.

FIG. 59 is an aberration diagram of Example 18 regarding a high temperature.

FIG. 60 is an aberration diagram of Example 19 at room temperature.

FIG. 61 is an aberration diagram for Example 19 at a low temperature.

FIG. 62 is an aberration diagram of Example 19 at a high temperature.

FIG. 63 is an aberration diagram of Example 20 at room temperature.

FIG. 64 is an aberration diagram of Example 20 at a low temperature.

FIG. 65 is an aberration diagram for Example 20 at a high temperature.

FIG. 66 is a diagram showing a basic lens configuration of Examples 21 and 22.

67 is an aberration diagram for Example 21 at room temperature. FIG.

FIG. 68 is an aberration diagram of Example 21 regarding a low temperature.

69 is an aberration diagram for Example 21 at a high temperature. FIG.

70 is an aberration diagram of Example 22 at normal temperature. FIG.

71 is an aberration diagram for Example 22 relating to low temperature. FIG.

72 is an aberration diagram for Example 22 at high temperature. FIG.

FIG. 73 is a diagram showing a basic lens configuration according to Examples 23 to 25.

FIG. 74 is an aberration diagram of Example 23 at room temperature.

FIG. 75 is an aberration diagram for Example 23 at a low temperature.

FIG. 76 is an aberration diagram of Example 23 at a high temperature.

77 is an aberration diagram of Example 24 at normal temperature. FIG.

FIG. 78 is an aberration diagram for Example 24 at a low temperature.

79 is an aberration diagram for Example 24 at a high temperature. FIG.

80 is an aberration diagram of Example 25 at normal temperature. FIG.

FIG. 81 is an aberration diagram for Example 25 at a low temperature.

82 is an aberration diagram for Example 25 at high temperature. FIG.

[Explanation of symbols]

 1 1st lens 2 2nd lens 3 3rd lens 4 4th lens 5 5th lens 6 6th lens 7 7th lens 8 Cover glass S diaphragm

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[Procedure amendment]

[Submission date] November 22, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG.

FIG. 4

[Figure 5]

FIG. 33

FIG. 6

FIG. 7

[Figure 8]

[Figure 9]

FIG. 10

FIG. 11

FIG.

FIG. 13

FIG. 14

FIG.

FIG. 16

FIG.

FIG.

FIG.

FIG. 21

FIG.

FIG. 23

FIG. 24

FIG. 25

FIG. 26

FIG. 28

FIG. 27

FIG. 29

FIG. 40

FIG. 30

FIG. 31

FIG. 35

FIG. 32

FIG. 34

FIG. 56

FIG. 36

FIG. 37

FIG. 66

FIG. 38

FIG. 39

FIG. 41

FIG. 42

FIG. 43

FIG. 45

FIG. 44

FIG. 46

FIG. 73

FIG. 47

FIG. 48

FIG. 49

FIG. 50

FIG. 51

FIG. 52

FIG. 53

FIG. 54

FIG. 57

FIG. 55

FIG. 58

FIG. 59

FIG. 60

FIG. 61

FIG. 62

FIG. 63

FIG. 64

FIG. 65

FIG. 67

FIG. 68

FIG. 69

FIG. 70

FIG. 71

FIG. 72

FIG. 74

FIG. 75

FIG. 76

FIG. 77

FIG. 78

FIG. 79

FIG. 80

FIG. 81

FIG. 82

Claims (22)

[Claims] 1. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens group, wherein first to sixth lens groups are sequentially arranged from the object side toward the image side. The group is a cemented lens in which a third lens which is a negative lens is cemented to the image side of a second lens which is a positive lens, and the third group is a fourth lens which is a convex meniscus lens having a convex surface facing the image side, The fourth group is a fifth lens which is a concave lens, the fifth group is a sixth lens which is a convex lens, and the sixth group is a seventh lens which is a seventh lens which is a convex meniscus lens with a convex surface facing the image side. The fourth, fifth, and sixth lenses are plastic lenses, and the fourth and sixth lenses both have an aspheric image-side surface, and the fourth lens has a focal point with respect to the e-line. distance f _4, the fifth, the synthetic focal length on e-sixth lens When the f _56, they conditions: (1-1) -4.1 <reading lens and satisfies the f ₄ / f ₅₆ <-1.1. 2. The reading lens according to claim 1, wherein the combined focal length of the entire system with respect to the e-line is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (2-2) 1.2 <f ₁ / f <2.2 (2-3) -3.7 <f ₂₆ /f<-1.0 (2- 4) Reading characterized by satisfying 0.06 <n (convex) -n (concave) <0.12 (2-5) 12.2 <ν (convex) -ν (concave) <20.6 lens. 3. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens group, wherein first to sixth lens groups are sequentially arranged from the object side toward the image side. The group is a cemented lens in which a third lens which is a negative lens is cemented to the image side of a second lens which is a positive lens, and the third group is a fourth lens which is a convex meniscus lens having a convex surface facing the image side, The fourth group is a fifth lens which is a concave lens, the fifth group is a sixth lens which is a convex lens, and the sixth group is a seventh lens which is a seventh lens which is a convex meniscus lens with a convex surface facing the image side. The fourth lens, the fifth lens, and the sixth lens are plastic lenses, and the fourth lens has an image-side surface that is an aspherical surface having a converging effect that increases with distance from the optical axis. As for the lens, the image-side surface becomes less converging as it moves away from the optical axis. Aspheric, focal length f ₄ for e line of the fourth lens, the fifth, when the combined focal length for e-line of the sixth lens and f _56, they conditions: (3-1) - 3.1 <reading lens and satisfies the f ₄ / f ₅₆ <-1.1. 4. The reading lens according to claim 3, wherein the combined focal length of the entire system with respect to the e-line is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (4-2) 1.2 <f ₁ / f <2.2 (4-3) -3.7 <f ₂₆ /f<-1.0 (4- 4) Reading characterized by satisfying 0.06 <n (convex) -n (concave) <0.12 (4-5) 12.2 <ν (convex) -ν (concave) <20.6 lens. 5. The reading lens according to claim 3, wherein the second lens is a convex meniscus lens having a convex surface directed toward the object side, and the third lens is a concave meniscus lens having a convex surface directed toward the object side. And a third lens, which is a cemented lens of the second lens group, has a negative refracting power. 6. The reading lens according to claim 5, wherein the combined focal length for the e-line of the entire system is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (6-2) 1.2 <f ₁ / f <2.2 (6-3) -3.7 <f ₂₆ /f<-1.0 (6- 4) Reading characterized by satisfying 0.06 <n (convex) -n (concave) <0.12 (6-5) 13.0 <ν (convex) -ν (concave) <20.6 lens. 7. The reading lens according to claim 5, wherein the fifth lens forming the fourth group is a biconcave lens, and the sixth lens forming the fifth group is a biconvex lens. 8. A first lens unit, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens unit formed by sequentially arranging first to sixth lens units from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. The third group is a fourth lens that is a convex meniscus lens having a convex surface facing the image side, the fourth group is a fifth lens that is a biconcave lens, and the fifth group is a convex meniscus lens having a convex surface facing the image side. The sixth lens is a seventh lens which is a seventh lens which is a convex meniscus lens having a convex surface facing the image side, and the fourth, fifth and sixth lenses are plastic lenses. In the fourth lens, the image-side surface is separated from the optical axis. A larger aspherical converging function in accordance with, the sixth lens surface on the image side is smaller aspherical converging action in accordance with distance from the optical axis, the focal length for the e-line of the fourth lens f ₄ , where f ₅₆ is the combined focal length of the fifth and sixth lenses with respect to the e-line, these satisfy the condition: (8-1) −2.4 <f ₄ / f ₅₆ <−1.6 A reading lens characterized in that. 9. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens group, which is formed by sequentially arranging first to sixth groups from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. , The third lens group is a convex meniscus lens having a convex surface facing the image side, the fourth lens group is a concave meniscus lens having a convex surface facing the image side, and the fifth lens group is an image side. A sixth lens which is a convex meniscus lens having a convex surface facing toward, and a sixth lens group is a sixth lens group consisting of seven lenses which is a seventh lens which is a convex meniscus lens having a convex surface facing toward the image side. The fifth and sixth lenses are plastic lenses, and the fourth lens The image-side surface is an aspherical surface whose converging action increases with distance from the optical axis, and the image-side surface of the sixth lens is an aspherical surface whose converging action decreases with distance from the optical axis. When the focal length of the fourth lens with respect to the e-line is f ₄ and the combined focal length of the fifth and sixth lenses with respect to the e-line is f ₅₆ , these are the conditions: (9-1) −2.3 <f ₄ A reading lens satisfying / f ₅₆ <-1.8. 10. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a first lens group and a second lens group, wherein the first lens group to the sixth lens group are sequentially arranged from the object side to the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. The third group is a fourth lens which is a convex meniscus lens having a convex surface directed toward the image side, the fourth group is a fifth lens which is a biconcave lens, and the fifth group is a sixth lens which is a biconvex lens. The group is a 7-lens structure of 6 groups which is a seventh lens which is a convex meniscus lens having a convex surface facing the image side, wherein the fourth, fifth and sixth lenses are plastic lenses and the fourth lens is , The image side surface becomes more converging as it moves away from the optical axis. An aspheric that, the sixth lens surface on the image side is smaller aspherical converging action in accordance with distance from the optical axis, the focal length for the e-line of the fourth lens f _4, the fifth , And the synthetic focal length of the sixth lens with respect to the e-line is f ₅₆ , these satisfy the condition: (10-1) −3.1 <f ₄ / f ₅₆ <−1.1, and F is the combined focal length for the line, and e of the first lens
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (10-2) 1.4 <f ₁ / f <2.1 (10-3) -3.7 <f ₂₆ /f<-1.0 (10- 4) Reading characterized by satisfying 0.08 <n (convex) -n (concave) <0.12 (10-5) 13.0 <ν (convex) -ν (concave) <19.1 lens. 11. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a first lens group and a second lens group, wherein the first to sixth lens groups are arranged in order from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. The third group is a fourth lens that is a convex meniscus lens having a convex surface facing the image side, the fourth group is a fifth lens that is a biconcave lens, and the fifth group is a convex meniscus lens having a convex surface facing the image side. The sixth lens is a seventh lens which is a seventh lens which is a convex meniscus lens having a convex surface facing the image side, and the fourth, fifth and sixth lenses are plastic lenses. In the fourth lens, the image side surface is separated from the optical axis. The sixth lens has an aspheric surface whose image-side surface has a smaller convergence as the distance from the optical axis, and the sixth lens has a focal length with respect to the e-line of the fourth lens. f ₄ and when the synthetic focal length of the fifth and sixth lenses with respect to the e-line is f ₅₆ , these satisfy the following conditions: (11-1) −2.4 <f ₄ / f ₅₆ <−1.6. Then, the combined focal length for the e-line of the entire system is f, and the e of the first lens is e
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (11-2) 1.2 <f ₁ / f <2.2 (11-3) -2.2 <f ₂₆ /f<-1.1 (11- 4) Reading characterized by satisfying 0.07 <n (convex) -n (concave) <0.11 (11-5) 13.3 <ν (convex) -ν (concave) <18.7 lens. 12. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a first lens group and a second lens group, wherein the first lens group to the sixth lens group are sequentially arranged from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. , The third lens group is a convex meniscus lens having a convex surface facing the image side, the fourth lens group is a concave meniscus lens having a convex surface facing the image side, and the fifth lens group is an image side. A sixth lens which is a convex meniscus lens having a convex surface facing toward, and a sixth lens group is a sixth lens group consisting of seven lenses which is a seventh lens which is a convex meniscus lens having a convex surface facing toward the image side. The fifth and sixth lenses are plastic lenses, and the fourth lens is Is an aspherical surface whose image-side surface has a larger converging effect as it moves away from the optical axis, and the sixth lens is an aspherical surface whose image-side surface has a smaller converging effect as it moves away from the optical axis. When the focal length of the fourth lens with respect to the e-line is f ₄ and the combined focal length of the fifth and sixth lenses with respect to the e-line is f ₅₆ , these are the conditions: (12-1) −2.3 <f ₄ / f ₅₆ <−1.8 is satisfied, the combined focal length for the e-line of the entire system is f, and the e of the first lens is e
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (12-2) 1.3 <f ₁ / f <1.9 (12-3) -1.7 <f ₂₆ /f<-1.1 (12- 4) Reading characterized by satisfying 0.06 <n (convex) -n (concave) <0.1 (12-5) 15.8 <ν (convex) -ν (concave) <20.6 lens. 13. A first lens, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens which is formed by sequentially arranging first to sixth groups from the object side toward the image side. The group has a positive refractive power by a cemented lens in which a third lens, which is a negative lens, is cemented to the image side of the second lens, which is a positive lens, and has a positive refractive power. The third group is a convex meniscus lens with a convex surface facing the image side. Is the fourth lens, the fourth group is the fifth lens, which is a concave meniscus lens with the convex surface facing the image side, the fifth group is the sixth lens, which is the convex lens, and the sixth group is the convex surface facing the image side. The seventh lens is a convex meniscus lens, which is a seventh lens in six groups, and the fourth, fifth, and sixth lenses are plastic lenses, and the fourth lens has an image-side surface on the optical axis. Is an aspherical surface whose converging action increases as the distance from the Surface on the side is a small aspherical converging action in accordance with distance from the optical axis, the focal length f ₄ for e line of the fourth lens, the fifth, the combined focal length on e-sixth lens f when the _56, they conditions: (13-1) -2.6 <reading lens and satisfies the f ₄ / f ₅₆ <-1.6. 14. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens group, wherein first to sixth lens groups are arranged in order from the object side toward the image side. The group has a positive refractive power by a cemented lens in which a third lens, which is a negative lens, is cemented to the image side of the second lens, which is a positive lens, and has a positive refractive power. The third group is a convex meniscus lens with a convex surface facing the image side. Is the fourth lens, the fourth group is the fifth lens, which is a concave meniscus lens with the convex surface facing the image side, the fifth group is the sixth lens, which is the convex lens, and the sixth group is the convex surface facing the image side. The seventh lens is a convex meniscus lens, which is a seventh lens in six groups, and the fourth, fifth, and sixth lenses are plastic lenses, and the fourth lens has an image-side surface on the optical axis. Is an aspherical surface whose converging action increases as the distance from the Surface on the side is a small aspherical converging action in accordance with distance from the optical axis, the focal length f ₄ for e line of the fourth lens, the fifth, the combined focal length on e-sixth lens f ₅₆ , these satisfy the condition: (14-1) −2.6 <f ₄ / f ₅₆ <−1.6, the combined focal length for the e-line of the entire system is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
(14-2) 1.6 <f ₁ / f <2.2 (14-3) −3.0 <f ₂₆ / f <−1.6 (14−) 4) Reading characterized by satisfying 0.08 <n (convex) -n (concave) <0.12 (14-5) 12.2 <ν (convex) -ν (concave) <15.8 lens. 15. A first lens, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens which are formed by sequentially arranging first to sixth groups from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. , The third group is a fourth lens which is a convex meniscus lens having a convex surface facing the image side, the fourth group is a fifth lens which is a concave lens, the fifth group is a sixth lens which is a convex lens, and the sixth group is A 7-lens 6-group structure that is a seventh lens that is a convex meniscus lens with a convex surface facing the image side, wherein the fourth, fifth, and sixth lenses are plastic lenses, and the fourth lens is an image Convergence becomes smaller as the side surface moves away from the optical axis Is a spherical, the sixth lens surface on the image side is larger aspherical converging action in accordance with distance from the optical axis, the focal length f ₄ for e line of the fourth lens, the fifth, when the combined focal length on e-6 lens is f _56, they conditions: (15-1) -4.1 <reading lens and satisfies the f ₄ / f ₅₆ <-1.7 . 16. The reading lens according to claim 15, wherein the combined focal length of the entire system with respect to the e-line is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
(16-2) 1.1 <f ₁ / f <2.1 (16-3) -2.2 <f ₂₆ /f<-0.8 (16- 4) Reading characterized by satisfying 0.07 <n (convex) −n (concave) <0.11 (16-5) 13.6 <ν (convex) −ν (concave) <20.5 lens. 17. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a first lens group and a second lens group, which are arranged in order from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. The third group is a fourth lens which is a convex meniscus lens having a convex surface directed toward the image side, the fourth group is a fifth lens which is a biconcave lens, and the fifth group is a sixth lens which is a biconvex lens. The group is a 7-lens structure of 6 groups which is a seventh lens which is a convex meniscus lens having a convex surface facing the image side, wherein the fourth, fifth and sixth lenses are plastic lenses and the fourth lens is , The image-side surface becomes less converging as it moves away from the optical axis An aspheric that, the sixth lens surface on the image side is larger aspherical converging action in accordance with distance from the optical axis, the focal length f ₄ for e line of the fourth lens, the fifth , And the synthetic focal length of the sixth lens for the e-line is f ₅₆ , these satisfy the condition: (17-1) −4.1 <f ₄ / f ₅₆ <−3.0. Reading lens. 18. The reading lens according to claim 17, wherein the combined focal length of the whole system with respect to the e-line is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
(18-2) 1.3 <f ₁ / f <1.8 (18-3) −1.1 <f ₂₆ /f<−0.8 (18−) 4) Reading characterized by satisfying 0.08 <n (convex) -n (concave) <0.10 (18-5) 16.8 <ν (convex) -ν (concave) <20.5 lens. 19. A first lens group, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens group, which is formed by sequentially arranging first to sixth groups from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. The third group is a fourth lens that is a convex meniscus lens having a convex surface facing the image side, the fourth group is a fifth lens that is a biconcave lens, and the fifth group is a convex meniscus lens having a convex surface facing the image side. The sixth lens is a seventh lens which is a seventh lens which is a convex meniscus lens having a convex surface facing the image side, and the fourth, fifth and sixth lenses are plastic lenses. In the fourth lens, the image side surface is separated from the optical axis. The sixth lens has an aspheric surface whose image-side surface has a larger convergence as it moves away from the optical axis, and the sixth lens has a focal length with respect to the e-line. f _4, the fifth, when the combined focal length for e-line of the sixth lens and f _56, they conditions: (19-1) -2.7 <satisfies f ₄ / f ₅₆ <-1.9 A reading lens characterized in that. 20. The reading lens according to claim 19, wherein the combined focal length of the entire system with respect to the e-line is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
When (concave), these are the conditions: (20-2) 1.4 <f ₁ / f <2.0 (20-3) -1.7 <f ₂₆ /f<-1.2 (20- 4) Reading characterized by satisfying 0.08 <n (convex) -n (concave) <0.10 (20-5) 16.8 <ν (convex) -ν (concave) <20.5 lens. 21. A first lens unit, which is a convex meniscus lens having a convex surface directed toward the object side, and a second lens unit which are formed by sequentially arranging first to sixth lens units from the object side toward the image side. The group is a cemented lens in which a third lens, which is a concave meniscus lens having a convex surface facing the object side, is cemented to the image side of a second lens, which is a convex meniscus lens having a convex surface facing the object side, and has a negative refractive power. , The third lens group is a convex meniscus lens having a convex surface facing the image side, the fourth lens group is a concave meniscus lens having a convex surface facing the image side, and the fifth lens group is an image side. A sixth lens which is a convex meniscus lens having a convex surface facing toward, and a sixth lens group is a sixth lens group consisting of seven lenses which is a seventh lens which is a convex meniscus lens having a convex surface facing toward the image side. The fifth and sixth lenses are plastic lenses, and the fourth lens is Is an aspherical surface whose image-side surface has a smaller converging effect as it goes away from the optical axis, and the sixth lens is an aspherical surface whose image-side surface has a greater converging effect as it goes away from the optical axis. When the focal length of the fourth lens with respect to the e-line is f ₄ and the combined focal length of the fifth and sixth lenses with respect to the e-line is f ₅₆ , these are the conditions: (21-1) −2.3 <f A reading lens characterized by satisfying ₄ / f ₅₆ <-1.7. 22. The reading lens according to claim 21, wherein the combined focal length of the entire system with respect to the e-line is f, and the e of the first lens is e.
The focal length with respect to the line is f ₁ , the combined focal length with respect to the e-line of the second lens to the sixth lens is f ₂₆ , and the e-line of the first, second, fourth, sixth and seventh lenses having positive refractive power. , N (convex) and ν (convex) respectively, and the average refractive index and average Abbe number of the third and fifth lenses having negative refractive power are n (concave) and ν, respectively.
(22-2) 1.1 <f ₁ / f <2.1 (22-3) -2.2 <f ₂₆ /f<-1.0 (22- 4) Reading characterized by satisfying 0.07 <n (convex) -n (concave) <0.11 (22-5) 13.6 <ν (convex) -ν (concave) <18.7 lens.