JP2015072403A - Image capturing lens, image capturing device, and mobile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact image capturing lens which offers a larger aperture, good correction for various aberrations, and a seven-lens configuration.SOLUTION: An image capturing lens 10 includes a positive first lens L1 having a convex surface on the object side, a negative second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a negative seventh lens L7 having an object-side surface which is concave near an optical axis AX, in order from the object side, and satisfies a conditional expression: 1.5<ET2/CT2<3.0...(1), where a value CT2 represents a center thickness of the second lens L2 and a value ET2 represents an edge thickness of the second lens L2. Here, the edge thickness of the second lens L2 is defined as thickness in the optical axis direction at a position of the lesser of an effective diameter of an object-side surface S21 and that of an image-side surface S22 of the second lens L2.

Description

  The present invention relates to a small imaging lens, an imaging apparatus and a portable terminal incorporating the same, and more particularly to an imaging lens suitable for a low profile having seven lenses, an imaging apparatus, and a portable terminal.

  In recent years, with the improvement in performance and miniaturization of imaging devices using solid-state imaging devices such as CCD (Charge Coupled Device) type image sensors or CMOS (Complementary Metal Oxide Semiconductor) type image sensors, Portable information terminals are becoming popular. More recently, with the increase in size and definition of display elements mounted on the above-described portable information terminals and the like, the imaging elements are also required to have higher pixels, and are mounted on these portable information terminals and the like. There is a growing demand for higher performance for imaging lenses. As imaging lenses for such applications, imaging lenses having five or six lenses have been proposed. Recently, a seven-lens lens having an excellent aberration correction capability compared to a five- or six-lens lens has been proposed for higher performance (see, for example, Patent Documents 1 and 2).

  On the other hand, there is a strong demand for downsizing of the image pickup apparatus on the other hand, while the demand for downsizing of the image pickup device is strong. In order to achieve both high downsizing and downsizing of the image pickup device, downsizing of the pixel size is progressing. As the pixel size of the image sensor becomes smaller, the amount of light that can be received per pixel decreases accordingly, and noise due to a decrease in the S / N ratio and image degradation due to camera shake that occurs due to a longer exposure time are problematic. Become. In order to solve the problem caused by the decrease in the amount of light that can be received per pixel, a brighter lens is demanded, and recently, a lens having a large aperture of F1.9 or less is demanded. On the other hand, increasing the diameter contributes to an increase in the amount of received light, but leads to the occurrence of monochromatic aberrations such as spherical aberration and coma aberration, and degrades optical performance. Patent Document 1 describes a seven-element imaging lens in which the first lens is positive, the second lens is negative, and both are dark imaging lenses of F2.0 or higher, and are sufficiently large. The aperture has not been made. In addition, these imaging lenses tend to have a weak negative power of the second lens, and it is expected that correction of coma aberration will be insufficient when the diameter is increased to F1.9 or less. Even if the coma aberration can be corrected satisfactorily, it becomes difficult to correct the chromatic aberration and it is difficult to maintain the performance. On the other hand, Patent Document 2 describes a seven-lens imaging lens in which the first lens is negative, the second lens is positive, and as in Patent Document 1, a dark imaging lens of F2.0 or higher is described. However, only a large diameter has not been described. Further, when the effective diameter of each lens is increased when the diameter is increased, the thickness in the optical axis direction is increased accordingly, so that it is difficult to shorten the optical total length.

China Utility Model Publication No. 2028886720 Specification China Utility Model Notification No. 202886713

The present invention has been made in view of such a problem, and while making the imaging lens as small as that of the conventional type, the various apertures were corrected well with an increased diameter. An object of the present invention is to provide an imaging lens having a sheet configuration. Here, although it is a scale of a small imaging lens, the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
L / 2Y <1.00 (13)
However,
L: Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: Diagonal length of the imaging surface of the imaging device (diagonal length of the rectangular effective pixel area of the imaging device)
Here, the image side focal point refers to an image point when a parallel light beam parallel to the optical axis is incident on the imaging lens. When a parallel plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of the image pickup device package is disposed between the most image side surface of the image pickup lens and the image side focal position, the parallel plate is used. The part is assumed to be the air conversion distance and the value of L is calculated.

The value L / 2Y is more preferably in the range of the following formula.
L / 2Y <0.95 (13) ′

In order to achieve the above object, an imaging lens according to the present invention includes, in order from the object side, a positive first lens, a negative second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The image side surface of the seventh lens has an aspheric shape, has an extreme value within an effective diameter other than the center, and satisfies the following conditional expression.
1.5 <ET2 / CT2 <3.0 (1)
CT2: Center thickness of the second lens ET2: Edge thickness of the second lens However, the edge thickness of the second lens is the smaller of the effective diameter of the object side surface and the effective diameter of the image side surface of the second lens. The thickness of the position in the optical axis direction
The effective diameter refers to the passing height of the light beam that passes through the position farthest from the optical axis among the light beam reaching the maximum image height. The extreme value is a point on the aspheric surface where the tangential plane or tangent of the apex of the aspheric surface is a plane or line segment perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius. .

  In the imaging lens according to the present invention, by using the first lens closest to the object side as a positive lens, the principal point position of the entire system is closer to the object side, which is advantageous for shortening the optical total length. In addition, by disposing the negative lens in the second lens, the negative lens can be disposed at a position where the axial light beam diameter is wide, so that the effect of correcting chromatic aberration can be enhanced and the performance can be improved. Further, by making the image side surface of the seventh lens an aspherical surface having an extreme value or an inflection point other than the center within the effective diameter, the incident angle when the light beam having the peripheral image height is incident on the imaging surface is suppressed to be small. Therefore, it is possible to improve the light receiving efficiency of the sensor when the image sensor is used.

Conditional expression (1) relating to the imaging lens of the present invention defines the ratio between the center thickness and the edge thickness of the second lens. By exceeding the lower limit of conditional expression (1), the second lens becomes a lens with a thicker edge thickness than the center thickness, so that it can have a strong negative power, which deteriorates when the aperture is increased. It is possible to improve the correction of chromatic aberration generated in the first lens while improving easy correction of coma. On the other hand, by falling below the upper limit of conditional expression (1), the edge thickness does not become too thick compared to the center thickness, and the second lens does not have excessively negative power, so spherical aberration due to strong negative power In addition, excessive correction of coma aberration can be prevented. Further, it is possible to prevent an increase in the difficulty of lens molding due to the difference between the center thickness and the edge thickness being too large.
As for the value of conditional expression (1), the range of the following expression is more desirable.
1.75 <ET2 / CT2 <2.5 (1) ′

  According to a specific aspect of the present invention, in the imaging lens, the seventh lens is a negative lens. For example, in an autofocus imaging device, the distance between the imaging lens and the imaging surface or sensor is changed, and therefore the distance between the lens and the imaging surface is required to be large to some extent in order to provide an adjustment margin. By making the seventh lens of the final lens a negative lens, the imaging lens and the imaging surface are moved away from each other, so that back focus can be secured.

  According to another aspect of the present invention, the seventh lens has a concave surface facing the image side in the vicinity of the optical axis. Since the seventh lens directs the concave surface to the image side, the position of the negative seventh lens is closer to the object side than the principal point position, which is advantageous for extending the back focus.

  According to still another aspect of the present invention, the object side surface of the seventh lens has an aspherical shape. By making the object side surface of the seventh lens aspherical, it is possible to have different powers in the vicinity of the optical axis and in the peripheral part, so optimal aberration correction for both on-axis rays and peripheral rays Will be able to.

  According to still another aspect of the present invention, each lens from the third lens to the sixth lens has an aspheric surface on at least one side. By making each of the third lens to the sixth lens a lens having at least one aspheric surface, it is possible to have different powers in the vicinity of the optical axis and in the peripheral portion. It becomes possible to correct the aberrations optimally for both. Since the amount of sag within the effective diameter can be reduced due to the degree of freedom of the aspherical shape, the area occupied by each lens in the optical axis direction can be reduced, which is advantageous for shortening the total optical length.

  According to still another aspect of the invention, the first lens has a convex surface facing the object side. Since the first lens has a convex surface directed toward the object side, the principal point position of the positive first lens moves toward the object side, so that the total optical length can be reduced while maintaining the focal length.

  According to still another aspect of the present invention, the second lens has a concave surface facing the image side. The axial ray bundle is converged by the positive first lens and is incident on the second lens. However, the incident angle of the axial ray bundle on the side surface of the second lens image is formed by directing the concave surface toward the image side. Therefore, the occurrence of spherical aberration can be reduced.

  According to still another aspect of the present invention, the second lens is a meniscus lens having a convex surface directed toward the object side. Furthermore, when the second lens is a meniscus lens having a convex surface directed toward the object side, the incident angle of the axial light beam on both surfaces of the second lens is reduced, so that the occurrence of spherical aberration can be reduced.

  According to still another aspect of the present invention, the sixth lens has a convex surface facing the image side. Since the sixth lens has a convex surface directed toward the image side, positive power can be shared with the first lens with respect to the axial ray bundle. Therefore, it is necessary to give the first lens excessive positive power. The generation of spherical aberration can be suppressed. On the other hand, since the incident angle is small with respect to the peripheral ray bundle, the occurrence of coma aberration can be suppressed.

  According to still another aspect of the present invention, an aperture stop is provided closer to the object side than the third lens. By disposing the aperture stop closer to the object side than the third lens, the exit pupil can be moved away from the imaging surface, so that the sensor incident angle can be kept small.

  According to still another aspect of the present invention, at least one of the fifth lens and the sixth lens is a positive lens. As for the influence on the curvature of field and astigmatism, the influence of the lens that is close to the imaging surface and the axial ray bundle and the ray bundle that forms an image on the periphery passes through different positions in the optical surface is large. In order to correct these aberrations, it is necessary to provide positive and negative power in a balanced manner to a lens close to the imaging surface. Since the fifth lens and the sixth lens are lenses close to the imaging surface, by giving positive power in relation to the seventh lens, the positive power is shared with the first lens in the power of the entire system. Thus, it is possible to improve the correction of field curvature and astigmatism.

According to still another aspect of the present invention, the following conditional expression is satisfied.
0.4 <f3456 / f <1.1 (2)
f3456: Composite focal length from the third lens to the sixth lens f: Focal length of the entire system (hereinafter omitted)

  Conditional expression (2) defines the ratio of the combined focal length of the third lens to the sixth lens and the focal length of the entire system. When the first lens is viewed as the first group, the second lens as the second group, the third lens through the sixth lens as the third group, and the seventh lens as the fourth group, the positive power of the third group is strong. Then, since the principal point position of the entire system is brought closer to the image side, the focal length is shortened and widened, or if the focal length is maintained, the optical total length is increased. By exceeding the lower limit of the conditional expression (2), the positive power of the third group does not become too strong, which is advantageous for shortening the optical total length while maintaining the focal length. On the other hand, by falling below the upper limit of conditional expression (2), the third lens group has a certain amount of positive power, so that the positive power can be shared with the first lens, which is advantageous for aberration correction.

As for the value of conditional expression (2), the range of the following expression is more desirable.
0.45 <f3456 / f <0.8 (2) ′
More desirably, the following range is satisfied.
0.45 <f3456 / f <0.6 (2) "

According to still another aspect of the present invention, the following conditional expression is satisfied.
0.5 <f1 / f <1.3 (3)
f1: Focal length of the first lens

  Conditional expression (3) defines the ratio between the focal length of the first lens and the focal length of the entire system. By exceeding the lower limit of the conditional expression (3), the power of the first lens does not become too strong, so that the occurrence of spherical aberration and coma can be suppressed. On the other hand, since the first lens has a strong power by falling below the upper limit of conditional expression (3), the principal point position of the entire system is closer to the object side, and the total optical length is reduced while maintaining the focal length. be able to.

As for the value of conditional expression (3), the range of the following expression is more desirable.
0.65 <f1 / f <1.1 (3) ′
More desirably, the following range is satisfied.
0.80 <f1 / f <0.95 (3) "

According to still another aspect of the present invention, the following conditional expression is satisfied.
−2.5 <f2 / f <−0.8 (4)
f2: focal length of the second lens

  Conditional expression (4) defines the ratio between the focal length of the second lens and the focal length of the entire system. The negative second lens has an effect of correcting spherical aberration and coma generated in the positive first lens, and further correcting chromatic aberration. Overcorrection can be avoided by falling below the upper limit of conditional expression (4), and undercorrection can be prevented by exceeding the lower limit, and optimal aberration correction can be performed.

As for the value of conditional expression (4), the range of the following expression is more desirable.
−2.0 <f2 / f <−0.9 (4) ′
More desirably, the following range is satisfied.
-1.5 <f2 / f <-1.0 (4) "

According to still another aspect of the present invention, the following conditional expression is satisfied.
−2.0 <f7 / f <−0.30 (5)
f7: Focal length of the seventh lens

  Conditional expression (5) defines the ratio between the focal length of the seventh lens and the focal length of the entire system. The seventh lens is a lens arranged closest to the image side. By giving a negative focal length, the back focus can be extended with the same optical total length. By exceeding the lower limit of the conditional expression (5), the seventh lens has a certain degree of strong power, so that sufficient back focus can be secured. On the other hand, by falling below the upper limit of conditional expression (5), it is possible to prevent the seventh lens from having an excessively negative power and increasing the total optical length due to excessively long back focus.

The value of conditional expression (5) is more preferably in the range of the following expression.
−1.5 <f7 / f <−0.35 (5) ′
More desirably, the following range is satisfied.
-1.0 <f7 / f <-0.40 (5) "

According to still another aspect of the present invention, the following conditional expression is satisfied.
1.3 <CT1 / ET1 <5.0 (6)
CT1: Center thickness of the first lens ET1: Edge thickness of the first lens However, the edge thickness of the first lens is a smaller one of the effective diameter of the object side surface and the effective diameter of the image side surface of the first lens. The thickness of the position in the optical axis direction

  Conditional expression (6) defines the ratio between the center thickness of the first lens and the edge thickness. When the lower limit of conditional expression (6) is exceeded, the first lens has a center thickness that is 1.3 times or more the edge thickness. Even if the effective diameter of the first lens increases with an increase in diameter, the center thickness is increased to such an extent that the first lens has a strong positive power while shortening the overall optical length while ensuring a certain edge thickness. Can be made possible. On the other hand, it is generally known that when there is a large difference between the edge thickness and the center thickness, moldability tends to deteriorate when a lens is molded with a resin. By falling below the upper limit of conditional expression (6), the center thickness does not become too large with respect to the edge thickness, so that the lens moldability can be improved.

As for the value of conditional expression (6), the range of the following expression is more desirable.
1.5 <CT1 / ET1 <4.0 (6) '
More desirably, the following range is satisfied.
1.5 <CT1 / ET1 <3.0 (6) "

According to still another aspect of the present invention, the aperture member having an aperture stop and having at least two predetermined apertures on the object side of the third lens has an aperture member having the smallest aperture diameter. It is arranged on the most image side and satisfies the following conditional expression.
1.05 <Φmax / Φmin <1.45 (7)
Φmax: the largest aperture diameter among the aperture diameters of the diaphragm member disposed on the object side relative to the third lens Φmin: the smallest aperture diameter among the aperture diameters of the diaphragm member disposed on the object side relative to the third lens

  In a large-aperture lens, coma aberration is prominent and difficult to correct. In order to improve the coma aberration, it is conceivable to arrange a light-shielding stop in addition to the aperture stop to block the light rays contributing to the coma aberration of the light beam formed at the peripheral image height. By having at least two aperture members closer to the object side than the third lens and disposing the aperture member having the smallest aperture diameter on the most image side, the light beam contributing to coma aberration can be effectively blocked. Therefore, the optical performance can be improved. Conditional expression (7) defines the ratio between the maximum aperture diameter and the minimum aperture diameter of the diaphragm member disposed on the object side from the third lens. By satisfying the range of conditional expression (7), the aperture diameters of the two diaphragm members can be made appropriate, light at the peripheral image height can be sufficiently blocked, and coma aberration can be improved.

As for the value of conditional expression (7), the range of the following expression is more desirable.
1.15 <Φmax / Φmin <1.40 (7) ′
More desirably, the following range is satisfied.
1.25 <Φmax / Φmin <1.35 (7) "

According to still another aspect of the present invention, the following conditional expression is satisfied.
1.0 <ΦL1 / ΦL2 <1.2 (8)
ΦL1: Maximum effective diameter of the first lens ΦL2: Maximum effective diameter of the second lens

  Conditional expression (8) defines the ratio between the effective diameter of the first lens and the effective diameter of the second lens. The second lens has an effect of correcting axial chromatic aberration and spherical aberration with respect to the axial ray bundle and correcting coma aberration with respect to the peripheral ray bundle. In order to correct the various aberrations generated in the first lens having a strong positive power when the height is lowered, the second lens needs a strong power. However, if the effective diameter of the second lens is increased, the axial ray bundle and the peripheral ray bundle pass through different positions of the second lens. The strong power cannot be demonstrated. When the lower limit of conditional expression (8) is exceeded, the effective diameter of the second lens becomes smaller, and the axial ray bundle and the peripheral ray bundle pass through close positions in the second lens. As a result, since strong power can be exhibited for both, it is possible to correct both spherical aberration, axial chromatic aberration, and coma aberration. On the other hand, by falling below the upper limit of conditional expression (8), it is possible to prevent the effective diameter of the second lens from becoming too small, and the amount of light at the peripheral image height from being insufficient due to vignetting or blocking of the light flux at the peripheral image height. . Further, it is possible to avoid an increase in the overall optical length due to the effective diameter of the first lens becoming too large and the first lens becoming thick in the optical axis direction.

As for the value of conditional expression (8), the range of the following expression is more desirable.
1.05 <ΦL1 / ΦL2 <1.20 (8) ′
More desirably, the following range is satisfied.
1.10 <ΦL1 / ΦL2 <1.20 (8) "

According to still another aspect of the present invention, the following conditional expression is satisfied.
0.51 <ΦL1 / f <0.75 (9)
ΦL1: Maximum effective diameter of the first lens

  Conditional expression (9) defines the ratio between the effective diameter of the first lens and the focal length of the entire system. The first lens is the most object side lens, and it is necessary to increase the effective diameter when the diameter is increased. On the other hand, if a lens having a large effective diameter is given a strong power, spherical aberration and coma aberration increase, making it difficult to correct aberrations. By exceeding the lower limit of the conditional expression (9), the effective diameter of the first lens is increased, so that the diameter can be increased. On the other hand, by falling below the upper limit of conditional expression (9), the effective diameter of the first lens does not become too large, so it is possible to have a strong positive power, and it is possible to reduce the height while increasing the diameter. become.

As for the value of conditional expression (9), the range of the following expression is more desirable.
0.60 <ΦL1 / f <0.72 (9) ′

According to still another aspect of the present invention, the image side surface of the third lens has an area of 80% or more of the effective diameter inclined toward the object side, and the third lens has a positive power near the end of the effective diameter, On the image side surface of the fourth lens, an area of 80% or more of the effective diameter is inclined toward the object side, the fourth lens has a positive power near the end of the effective diameter, and the fifth lens is near the end of the effective diameter. Has negative power. Here, the power of the lens is positive when the light beam is refracted in the direction approaching the optical axis when parallel light is incident on the lens, and negative when the light is refracted in the direction away from the optical axis. Suppose you have the power of
In a large-aperture lens, since the coma aberration at the peripheral image height is large, it is desirable that the coma aberration be as small as possible. By setting the peripheral portion of the third lens and the fourth lens to positive power, the light beam formed at the peripheral image height is converged and reduced, and the incident angle of light passing through the upper and lower aperture ends incident on the next lens Therefore, the coma aberration occurring after the next lens can be reduced. At the same time, by tilting the image side surface of the periphery of the third lens and the fourth lens toward the object side, the incident angle of the light beam toward the periphery is reduced, so that the occurrence of coma aberration can be reduced. Further, by setting the peripheral portion of the fifth lens to a negative power, it is possible to correct aberrations such as coma and field curvature that are generated by the positive power of the peripheral portion of the third lens and the fourth lens. .

According to still another aspect of the present invention, the following conditional expression is satisfied.
0.05 <L5T / TTL <0.15 (10)
L5T: distance in the optical axis direction from the most convex portion on the object side of the fifth lens to the object side on the object side to the most convex portion on the image side on the image side TTL: optical total length (from the member closest to the object side to the imaging surface) Distance)

  Conditional expression (10) is the distance in the optical axis direction from the most convex part to the object side within the effective diameter on the object side of the fifth lens to the most convex part to the image side within the effective diameter on the image side. Defines the ratio of the focal lengths of the system. The value L5T represents the width of the region occupied by the optical surface of the fifth lens in the optical axis direction. If the value is too large, the total optical length is hindered. If the value is too small, the fifth lens has only a small power. It becomes difficult to correct aberrations such as surface curvature. By satisfying conditional expression (10), aberration correction and shortening of the optical total length can be achieved in a balanced manner.

According to still another aspect of the present invention, the following conditional expression is satisfied.
10 ° <θS8 <60 ° (11)
−25 ° <θS10 <10 ° (12)
θS8: Maximum surface angle within the effective diameter of the image side surface of the fourth lens θS10: Minimum surface angle at 80% to 10% of the effective diameter of the image side surface of the fifth lens However, the surface angle is parallel to the optical axis perpendicular line 0 ° is set to a positive value when tilted toward the object side, and a negative value when tilted toward the image side.

Conditional expression (11) defines the angle of the maximum surface within the effective diameter of the fourth lens image side surface. By exceeding the lower limit of the conditional expression (11), the image side surface of the fourth lens has a shape in which the peripheral portion is inclined toward the object side and can be set to an angle close to perpendicular to the incident light beam, thereby reducing the occurrence of coma aberration. can do. On the other hand, if the surface angle becomes too large, it is difficult to mold the lens, but the lens is easily molded by being less than the upper limit of the conditional expression (11).
The value of conditional expression (11) is more preferably in the range of the following expression.
25 ° <θS8 <50 ° (11) ′
On the other hand, conditional expression (12) defines the minimum surface angle outside the effective diameter 80% of the fifth lens image side surface. By falling below the upper limit of the conditional expression (12), the peripheral portion of the side surface of the fifth lens image approaches the optical axis perpendicularly, and an effect of refracting incident light rays and jumping away from the optical axis can be obtained. Since the refraction can be shared with the negative second lens, the occurrence of coma aberration can be suppressed. On the other hand, by exceeding the lower limit of the conditional expression (12), the peripheral portion of the side surface of the fifth lens image is not inclined too much toward the image side, and the refraction of light rays does not become too large, so that the occurrence of coma aberration can be suppressed.

As for the value of conditional expression (12), the range of the following expression is more desirable.
−10 ° <θS10 <5 ° (12) ′

  In still another aspect of the present invention, the optical device further includes an optical element having substantially no power.

  An imaging apparatus according to the present invention includes the imaging lens described above and an imaging element. By using the imaging lens of the present invention, a small, bright and high-performance imaging device can be obtained.

  The portable terminal which concerns on this invention is provided with the above-mentioned imaging device. By using the imaging device of the present invention, a small and high performance portable terminal can be obtained.

It is a figure explaining an imaging device provided with the imaging lens of one embodiment of the present invention. It is a partial expanded sectional view explaining the state of a lens or a diaphragm member. It is a block diagram explaining a portable terminal provided with the imaging device of FIG. (A) And (B) is a perspective view of the surface side and back surface side of a portable terminal, respectively. 2 is a cross-sectional view of an imaging lens of Example 1. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 1. FIG. 6 is a cross-sectional view of an imaging lens of Example 2. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 2. FIG. 6 is a cross-sectional view of an imaging lens of Example 3. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 3. FIGS. 6 is a cross-sectional view of an imaging lens of Example 4. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 4. FIGS. 6 is a cross-sectional view of an imaging lens of Example 5. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 5. FIGS. 6 is a cross-sectional view of an imaging lens of Example 6. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 6. FIG. 10 is a cross-sectional view of an imaging lens of Example 7. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 7. FIGS. 10 is a cross-sectional view of an imaging lens of Example 8. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 8. FIGS. 10 is a cross-sectional view of an imaging lens of Example 9. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 9. FIGS. 10 is a cross-sectional view of an imaging lens of Example 10. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 10. FIGS.

  Hereinafter, with reference to FIG. 1 etc., the imaging lens etc. which are one Embodiment of this invention are demonstrated. The imaging lens 10 illustrated in FIG. 1 has the same configuration as the imaging lens 11 of Example 1 described later.

  FIG. 1 is a cross-sectional view illustrating a camera module including an imaging lens according to an embodiment of the present invention.

  The camera module 50 includes an imaging lens 10 that forms a subject image, an imaging device 51 that detects a subject image formed by the imaging lens 10, and a wiring board 52 that holds the imaging device 51 from behind and has wiring and the like. And a lens barrel portion 54 having an opening OP for holding the imaging lens 10 and the like and allowing a light beam from the object side to enter. The imaging lens 10 has a function of forming a subject image on the image plane or the imaging plane (projected plane) I of the imaging element 51. The camera module 50 is used by being incorporated in an imaging device to be described later.

  The imaging lens 10 includes, in order from the object side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. With. Between these first to seventh lenses L1 to L7, an aperture stop AS and a light-shielding stop FS are disposed as stop members at appropriate positions such as the object side of the first lens L1.

The imaging lens 10 is small, and as a scale thereof, it is aimed to be downsized to a level that satisfies the following expression (13).
L / 2Y <1.00 (13)
Here, L is the distance on the optical axis AX from the most object side lens surface (object side surface S11) of the entire imaging lens 10 system to the image side focal point, and 2Y is the diagonal length of the imaging surface of the image sensor 51 ( The diagonal length of the rectangular effective pixel area of the image sensor 51), and the image-side focus refers to an image point when a parallel ray parallel to the optical axis AX is incident on the imaging lens 10. By satisfying this range, the entire camera module 50 can be reduced in size.

A parallel flat plate F such as an optical low-pass filter, an infrared cut filter, or a seal glass of an image pickup device package is disposed between the most image side surface (image side surface S72) of the image pickup lens 10 and the image side focal position. In this case, the value of L is calculated for the parallel flat plate F portion as an air conversion distance. More preferably, it is in the range of the following formula.
L / 2Y <0.95 (13) ′

  The image sensor 51 is a sensor chip made of a solid-state image sensor. The photoelectric conversion unit 51a of the image sensor 51 is composed of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor), photoelectrically converts incident light for each RGB, and outputs an analog signal thereof. The surface of the photoelectric conversion unit 51a as the light receiving unit is an image plane or an imaging plane (projected plane) I.

  The wiring board 52 has a role of aligning and fixing the image sensor 51 to other members (for example, the lens barrel portion 54). The wiring board 52 can receive a voltage and a signal for driving the image pickup device 51 and the driving mechanism 55a from an external circuit, and can output a detection signal to the external circuit.

  On the imaging lens 10 side of the imaging element 51, a parallel plate F is disposed and fixed by a holder member (not shown) so as to cover the imaging element 51 and the like.

  The lens barrel 54 houses and holds the imaging lens 10. The lens barrel portion 54 enables the focusing operation of the imaging lens 10 by moving any one or more of the lenses L1 to L7 constituting the imaging lens 10 along the optical axis AX. For example, it has a drive mechanism 55a. The drive mechanism 55a includes, for example, a voice coil motor and a guide, and reciprocates a specific lens or all of the lenses along the optical axis AX.

  Although illustration is abbreviate | omitted, the 1st-7th lenses L1-L7 which comprise the imaging lens 10 have the comparatively thick flange part for a support on the outer periphery periphery, respectively, via a flange part. It is laminated with an adjacent lens and held in the lens barrel portion 54a.

  With reference to FIG. 2 etc., the state of the imaging lens 10 hold | maintained in the lens-barrel part 54 is demonstrated. The first to seventh lenses L1 to L7 constituting the imaging lens 10 each have a supporting flange portion 39, and are stacked with adjacent lenses via the flange portion 39, and are held in the lens barrel portion 54a. Has been. Between these lenses L1 to L7, one aperture stop AS and five light-shielding stops FS are disposed between the flange portions 39 to prevent the generation of stray light. An aperture stop FS that covers the periphery of the effective diameter of the lens L1 is formed on the object side of the lens barrel portion 54a. A light-shielding stop FS is also disposed on the image side of the flange portion 39 of the seventh lens L7. The aperture stop AS and the light-shielding stop FS described above are stop members for selectively allowing light rays contributing to image formation to pass through.

  Next, an example of a cellular phone or other portable terminal 300 equipped with the camera module 50 illustrated in FIG. 1 will be described with reference to FIGS. 3, 4A, and 4B.

  The mobile terminal 300 is a smartphone-type mobile communication terminal, and includes an imaging device 100 having a camera module 50, a control unit (CPU) 310 that performs overall control of each unit and executes a program corresponding to each process, and communication. Various operations between a display operation unit 320 that is a touch panel that displays data related to the image, captured video, and the like and receives a user operation, an operation unit 330 including a power switch, and an external server via the antenna 341 Executed by a wireless communication unit 340 for realizing information communication, a storage unit (ROM) 360 storing necessary data such as a system program, various processing programs, and a terminal ID of the mobile terminal 300, and the control unit 310 Various processing programs and data, processing data, or imaging data by the imaging device 100 Temporary storage unit used as a work area for temporarily storing data or the like and a (RAM) 370.

  In addition to the camera module 50 described above, the imaging apparatus 100 includes a control unit 103, an optical system driving unit 105, an imaging element driving unit 107, an image memory 108, and the like.

  The control unit 103 controls each unit of the imaging device 100. The control unit 103 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and various types of programs are read out from the ROM and expanded in the RAM, in cooperation with the CPU. Execute the process. The control unit 103 is communicably connected to the control unit 310 outside the imaging apparatus 100, and can exchange control signals and image data.

  The optical system driving unit 105 controls the state of the imaging lens 10 by operating the driving mechanism 55 a of the imaging lens 10 when performing focusing, exposure, and the like under the control of the control unit 103. The optical system driving unit 105 operates the driving mechanism 55a to appropriately move the specific lens or all the lenses in the imaging lens 10 along the optical axis AX, thereby causing the imaging lens 10 to perform a focusing operation or the like.

  The image sensor drive unit 107 controls the operation of the image sensor 51 when performing exposure or the like under the control of the control unit 103. Specifically, the image sensor driving unit 107 scans and drives the image sensor 51 based on the timing signal, and extracts an image signal therefrom. The image sensor driving unit 107 can perform various image processing such as distortion correction, color correction, and compression on the image signal detected and digitized by the image sensor 51.

  The image memory 108 receives the digitized image signal from the image sensor driving unit 107 and stores it as readable and writable image data.

  Here, the photographing operation of the mobile terminal 300 including the imaging device 100 will be described. When the camera mode in which the mobile terminal 300 is operated as a camera is set, subject monitoring (through image display) and image shooting execution are performed. In monitoring, an image of a subject obtained through the imaging lens 10 is formed on the imaging surface I (see FIG. 1) of the imaging element 51. The image sensor 51 is scanned and driven by the image sensor driving unit 107 and detects an analog signal corresponding to one screen as a photoelectric conversion output corresponding to a light image formed at regular intervals.

  This analog signal is converted into digital data after gain adjustment is appropriately performed for each primary color component of RGB in a circuit attached to the image sensor 51. The digital data is subjected to color process processing including pixel interpolation processing and Y correction processing in the image sensor driving unit 107 to generate a digital luminance signal Y and color difference signals Cb, Cr (image data). And stored in the image memory 108. The stored digital data is periodically read out from the image memory 108 and used to generate a video signal, and is output to the display operation unit 320 via the control unit 103 and the control unit 310.

  The display operation unit 320 functions as a finder in monitoring and displays captured images in real time. In this state, focusing, exposure, and the like of the imaging lens 10 are set by driving the optical system driving unit 105 based on an operation input performed by the user via the display operation unit 320 at any time.

  In such a monitoring state, when the user appropriately operates the display operation unit 320, still image data is captured. One frame of image data stored in the image memory 108 is read in accordance with the operation content of the display operation unit 320, and processing such as compression is performed by the image sensor driving unit 107. The processed image data is recorded in the temporary storage unit 370, for example, via the control unit 103 and the control unit 310.

  The above-described imaging apparatus 100 is an example of an imaging apparatus suitable for the present invention, and the present invention is not limited to this.

  That is, the imaging device equipped with the camera module 50 or the imaging lens 10 is not limited to being built in the smartphone-type mobile terminal 300, but may be built into a mobile phone, a PHS (Personal Handyphone System), or the like. Of course, it may be incorporated in a PDA (Personal Digital Assistant), a tablet personal computer, a mobile personal computer, a digital still camera, a video camera, or the like.

Hereinafter, returning to FIG. 1 and the like, the imaging lens 10 according to an embodiment of the present invention will be described in detail. An imaging lens 10 shown in FIG. 1 forms a subject image on an imaging surface (projected surface) I of an image sensor 51, and in order from the object side, a positive first lens L1 and a negative second lens. A lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a negative seventh lens L7 are provided. In the imaging lens 10, the first lens L1 has a convex surface facing the object side near the optical axis AX, and the second lens L2 has a concave surface facing the image side and a convex surface facing the object side near the optical axis AX. Meniscus lens. At least one of the fifth lens L5 and the sixth lens L6 is a positive lens, and the sixth lens L6 has a convex surface facing the image side in the vicinity of the optical axis AX. The object side surface and the image side surface of the first to sixth lenses L1 to L6 are both aspherical surfaces. The seventh lens L7 closest to the image side has a concave surface facing the image side in the vicinity of the optical axis AX. The object side surface S71 and the image side surface S72 have an aspherical shape, and in particular, the image side surface S72 has a region other than the center. There is an extreme value at position P within the effective diameter.
In the imaging lens 10, the image side surface S32 of the third lens L3 has an area of 80% or more (outside) of the effective diameter inclined toward the object side, and the third lens L3 exhibits positive power near the end of the effective diameter. Have. On the image side surface S42 of the fourth lens L4, an area of 80% or more (outside) of the effective diameter is inclined toward the object side, and the fourth lens L4 has a positive power near the end of the effective diameter. The fifth lens L5 has a negative power near the end of the effective diameter.
The imaging lens 10 has, for example, two or more aperture members on the object side from the third lens L3. In the illustrated example, an aperture stop AS as a stop member is disposed between the first and second lenses L1 and L2, and a light-shielding stop FS as a stop member is connected to the object side of the first lens L1, the second and second lenses L1, L2. Arranged between the third lenses L2 and L3.

  According to the imaging lens 10, by using the first lens L1 closest to the object side as a positive lens, the principal point position of the entire system is closer to the object side, which is advantageous for shortening the optical total length. Further, since the negative second lens L2 is arranged next to the positive first lens L1, the negative lens can be arranged at a position where the axial light beam diameter is wide, so that the effect of correcting chromatic aberration can be enhanced, and high performance. Can be Further, by making the image side surface S72 of the seventh lens L7 an aspherical surface having an extreme value at the position P within the effective diameter, the incident angle when the light beam of the peripheral image height is incident on the imaging surface I can be kept small. Therefore, the light receiving efficiency of the image sensor 51 can be improved.

In the imaging lens 10, the value CT2 is the center thickness of the second lens L2, and the value ET2 is the edge thickness of the second lens L2.
1.5 <ET2 / CT2 <3.0 (1)
Is satisfied. However, the edge thickness of the second lens L2 is the thickness in the optical axis direction at the position of the smaller diameter of the effective diameter of the object side surface S21 and the effective diameter of the image side surface S22 of the second lens L2.
Conditional expression (1) defines the ratio between the center thickness and the edge thickness of the second lens L2. When the value ET2 / CT2 of conditional expression (1) exceeds the lower limit, the second lens L2 becomes a lens having a thicker edge thickness than the center thickness, so that it can have a strong negative power, and has a large aperture. It is possible to improve the correction of the chromatic aberration generated in the first lens L1 while improving the correction of the coma aberration that is likely to be deteriorated. On the other hand, since the value ET2 / CT2 of conditional expression (1) is below the upper limit, the edge thickness does not become too thick compared to the center thickness, and the second lens L2 does not have excessively negative power, which is strong. It is possible to prevent overcorrection of spherical aberration and coma due to negative power. Further, it is possible to prevent an increase in the difficulty of lens molding due to the difference between the center thickness and the edge thickness being too large.
Note that the value ET2 / CT2 of the conditional expression (1) is more preferably within the range of the following conditional expression (1) ′.
1.75 <ET2 / CT2 <2.5 (1) ′

In addition to the conditional expression (1), the imaging lens 10 of the present embodiment has the conditional expression (2) already described.
0.4 <f3456 / f <1.1 (2)
Satisfied. However, the value f3456 is the combined focal length from the third lens L3 to the sixth lens L6, and the value f is the focal length of the entire system.
The value f3456 / f of the conditional expression (2) is more preferably within the range of the following conditional expression (2) ′.
0.45 <f3456 / f <0.8 (2) ′
The value f3456 / f is more preferably within the range of the following conditional expression (2) ".
0.45 <f3456 / f <0.6 (2) "

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (3) already described.
0.5 <f1 / f <1.3 (3)
Satisfied. However, the value f1 is the focal length of the first lens L1.
The value f1 / f of conditional expression (3) is more preferably within the range of conditional expression (3) ′ below.
0.65 <f1 / f <1.1 (3) ′
The value f1 / f is more preferably within the range of the following conditional expression (3) ".
0.80 <f1 / f <0.95 (3) "

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (4) already described.
−2.5 <f2 / f <−0.8 (4)
Satisfied. However, the value f2 is the focal length of the second lens L2.
The value f2 / f of conditional expression (4) is more preferably within the range of conditional expression (4) ′ below.
−2.0 <f2 / f <−0.9 (4) ′
The value f2 / f is more preferably within the range of the following conditional expression (4) ".
-1.5 <f2 / f <-1.0 (4) "

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (5) already described.
−2.0 <f7 / f <−0.30 (5)
Satisfied. However, the value f7 is the focal length of the seventh lens L7.
The value f7 / f of the conditional expression (4) is more preferably within the range of the following conditional expression (5) ′.
−1.5 <f7 / f <−0.35 (5) ′
The value f7 / f is more preferably within the range of the following conditional expression (5) ".
-1.0 <f7 / f <-0.40 (5) "

In the imaging lens 10 of the present embodiment, in addition to the conditional expression (1), the conditional expression (6) already described.
1.3 <CT1 / ET1 <5.0 (6)
Satisfied. However, the value CT1 is the center thickness of the first lens L1, and the value ET1 is the edge thickness of the first lens L1. The edge thickness of the first lens L1 is the optical axis at the position of the smaller one of the effective diameter or optical surface diameter of the object side surface S11 of the first lens L1 and the effective diameter or optical surface diameter of the image side surface S12. The thickness in the direction
The value CT1 / ET1 of the conditional expression (6) is more preferably within the range of the following conditional expression (6) ′.
1.5 <CT1 / ET1 <4.0 (6) '
The value CT1 / ET1 is more preferably within the range of the following conditional expression (6) ".
1.5 <CT1 / ET1 <3.0 (6) "

The imaging lens 10 of the present embodiment has the conditional expression (7) already described in addition to the conditional expression (1).
1.05 <Φmax / Φmin <1.45 (7)
Satisfied. However, the value Φmax is the largest aperture diameter among the aperture diameters of the aperture members AS and FS disposed on the object side relative to the third lens L3, and the value Φmin is disposed on the object side relative to the third lens L3. It is the smallest aperture diameter among the aperture diameters of the aperture members AS and FS.
Note that the value Φmax / Φmin of the conditional expression (7) is more preferably within the range of the following conditional expression (7) ′.
1.15 <Φmax / Φmin <1.40 (7) ′
The value Φmax / Φmin is more preferably within the range of the following conditional expression (7) ".
1.25 <Φmax / Φmin <1.35 (7) "

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (8) already described.
1.0 <ΦL1 / ΦL2 <1.2 (8)
Satisfied. However, the value ΦL1 is the maximum effective diameter of the first lens L1, and the value ΦL2 is the maximum effective diameter of the second lens L2.
The value ΦL1 / ΦL2 of the conditional expression (8) is more preferably within the range of the following conditional expression (8) ′.
1.05 <ΦL1 / ΦL2 <1.20 (8) ′
The value ΦL1 / ΦL2 is more preferably within the range of the following conditional expression (8) ″.
1.10 <ΦL1 / ΦL2 <1.20 (8) "

The imaging lens 10 of the present embodiment has the conditional expression (9) already described in addition to the conditional expression (1).
0.51 <ΦL1 / f <0.75 (9)
Satisfied. However, the value ΦL1 is the maximum effective diameter of the first lens L1.
Note that the value ΦL1 / f of the conditional expression (9) is more preferably within the range of the following conditional expression (9) ′.
0.60 <ΦL1 / f <0.72 (9) ′

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (10) already described.
0.05 <L5T / TTL <0.15 (10)
Satisfied. However, the value L5T is the distance in the optical axis direction from the most convex portion toward the image side in the image side surface S52 from the most convex portion toward the image side in the object side surface S51 of the fifth lens L5. Full length.

The imaging lens 10 of the present embodiment has the conditional expressions (11) and (12) already described in addition to the conditional expression (1).
10 ° <θS8 <60 ° (11)
−25 ° <θS10 <10 ° (12)
Satisfied. However, the value θS8 is the maximum surface angle within the effective diameter of the image side surface S42 of the fourth lens L4, and the value θS10 is the minimum surface angle at 80% to 10% of the effective diameter of the image side surface S52 of the fifth lens L5. is there. The surface angle is 0 ° parallel to the optical axis perpendicular, and is a positive value when tilted toward the object side, and a negative value when tilted toward the image side.
The value θS8 of the conditional expression (11) is more preferably within the range of the following conditional expression (11) ′.
25 ° <θS8 <50 ° (11) ′
The value θS10 of the conditional expression (12) is more preferably within the range of the following conditional expression (12) ′.
−10 ° <θS10 <5 ° (12) ′

  Although not particularly illustrated, the imaging lens 10 of the present embodiment may further include a lens or other optical element that does not substantially have power.

ただし、
Ａｉ：ｉ次の非球面係数
Ｒ：曲率半径
Ｋ：円錐定数
さらに、各実施例において、「ＳＴＯ」は開口絞りＡＳを意味し、「ＦＳ」は遮光絞りＦＳを意味する。
なお、各実施例の撮像レンズが前提とする使用基本波長は５８７．５６ｎｍであり、曲率半径等の面形状の単位はｍｍである。 Hereinafter, specific examples of the imaging lens according to the present invention will be described. In each embodiment, r represents the radius of curvature, d represents the axial top surface spacing, nd represents the refractive index of the lens material with respect to the d-line, vd represents the Abbe number of the lens material, “eff. “dia.” means an effective diameter. In addition, the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface has the vertex of the surface as the origin, the X axis in the optical axis AX direction, The height in the direction perpendicular to the axis AX is represented by “Equation 1” below.

However,
Ai: i-order aspherical coefficient R: radius of curvature K: conical constant Further, in each embodiment, “STO” means the aperture stop AS, and “FS” means the light blocking stop FS.
In addition, the use fundamental wavelength which the imaging lens of each Example presupposes is 587.56 nm, and the unit of surface shape, such as a curvature radius, is mm.

[Example 1]
The lens surface data of Example 1 is shown in Table 1 below.
[Table 1]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.1000 2.700
2 * 1.9667 0.7120 1.54470 56 2.625
3 * -9.5028 0.0663 2.494
STO INFINITY 0.0000 2.443
5 * 2.1268 0.1504 1.63469 23.9 2.282
6 * 1.1775 0.3670 2.056
7 FS INFINITY 0.1800 2.050
8 * 22.5212 0.3660 1.54470 56 2.182
9 * 8.2854 0.1000 2.451
10 * 2.6266 0.3717 1.54470 56 2.778
11 * 4.7470 0.1535 3.036
12 * 8.6726 0.2000 1.63469 23.9 3.277
13 * 5.3552 0.2870 3.431
14 * 8.4713 0.6176 1.54470 56 3.820
15 * -1.2722 0.2844 4.092
16 * 45.1563 0.3151 1.54470 56 4.908
17 * 1.0531 0.4000 5.309
18 INFINITY 0.1100 1.51633 64.1 5.602
19 INFINITY 0.3790

The aspheric coefficients of the lens surfaces of Example 1 are shown in Table 2 below.
[Table 2]
Second side
K = -8.22802e-001, A4 = 1.91375e-002, A6 = 5.43170e-003,
A8 = -5.90436e-003, A10 = 8.76981e-003, A12 = -4.67995e-003,
A14 = 1.07996e-003
Third side
K = -7.98909e + 001, A4 = 9.81762e-002, A6 = -1.18737e-001,
A8 = 1.18025e-001, A10 = -7.92024e-002, A12 = 3.03109e-002,
A14 = -4.86274e-003
5th page
K = -2.24162e + 001, A4 = 1.80214e-002, A6 = -4.06404e-002,
A8 = 5.39192e-002, A10 = -5.00906e-002, A12 = 2.27445e-002,
A14 = -3.54001e-003
6th page
K = -6.33786e + 000, A3 = 1.03847e-002, A4 = 1.36593e-002,
A5 = 1.94056e-002, A6 = 4.64130e-002, A8 = -1.32939e-001,
A10 = 1.71554e-001, A12 = -1.14880e-001, A14 = 3.23310e-002
8th page
K = -2.79837e + 001, A3 = -1.02503e-002, A4 = 1.95438e-002,
A5 = -1.94346e-001, A6 = 2.30842e-001, A8 = -2.05062e-001,
A10 = 1.34975e-001, A12 = -5.11263e-002, A14 = -3.10333e-004
9th page
K = 4.97825e + 000, A3 = -4.48486e-002, A4 = -1.72924e-001,
A5 = 4.01329e-003, A6 = 6.30455e-002, A8 = -4.19386e-002,
A10 = 6.44463e-003, A12 = 6.17139e-003, A14 = -4.50847e-003
10th page
K = 4.89398e-001, A3 = -7.49603e-002, A4 = -1.53262e-001,
A5 = 9.45476e-003, A6 = -1.14499e-002, A8 = 5.41254e-003,
A10 = 7.60970e-003, A12 = 1.34869e-003, A14 = -1.55023e-003
11th page
K = 6.32329e + 000, A3 = -8.08059e-002, A4 = -5.21718e-002,
A5 = 5.05387e-002, A6 = -1.28865e-001, A8 = 5.81021e-002,
A10 = -1.28264e-002, A12 = 1.49895e-003
12th page
K = 1.86989e + 001, A3 = -4.91918e-002, A4 = -3.35069e-001,
A5 = 3.65152e-001, A6 = -2.67571e-001, A8 = 1.01794e-001,
A10 = -1.92471e-002, A12 = 8.87502e-004
Side 13
K = -3.08174e + 000, A3 = -3.23757e-002, A4 = -2.63810e-001,
A5 = 1.59983e-001, A6 = -4.87836e-002, A8 = 6.04489e-003,
A10 = 6.42809e-003, A12 = -2.20734e-003, A14 = 1.58325e-004
14th page
K = -3.38748e + 001, A3 = -3.88196e-003, A4 = 1.24503e-002,
A5 = -1.20172e-001, A6 = 1.17358e-001, A8 = -4.78783e-002,
A10 = 1.49422e-002, A12 = -2.67805e-003, A14 = 2.20101e-004
15th page
K = -9.07157e + 000, A3 = -9.46510e-002, A4 = -5.97512e-002,
A5 = 1.02415e-001, A6 = -6.69828e-003, A8 = -1.78173e-002,
A10 = 6.50738e-003, A12 = -1.12326e-003, A14 = 7.68896e-005
16th page
K = 7.99641e + 001, A3 = -1.20236e-001, A4 = -9.23792e-002,
A5 = 3.91343e-002, A6 = 2.25840e-002, A8 = -2.96911e-003,
A10 = -3.44293e-004, A12 = 8.49048e-005, A14 = -4.43939e-006
17th page
K = -6.37169e + 000, A3 = -1.87779e-003, A4 = -1.49423e-001,
A5 = 1.11589e-001, A6 = -2.92809e-002, A8 = 1.35999e-003,
A10 = -2.30915e-004, A12 = 2.63067e-005, A14 = -8.30657e-007
In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰⁰² ) is expressed using e (for example, 2.5e−002).

The characteristics of the imaging lens of Example 1 are listed below.
FL 3.778
Fno 1.44
w 75.33
Ymax 2.916
BF 0.889
TL 5.060
BFa 0.852
TLa 5.023
Here, FL means the focal length of the entire imaging lens system, Fno means the F number, w means the diagonal field angle, Ymax means the maximum image height, that is, the half value of the diagonal length of the imaging surface of the imaging device. BF means back focus (final lens to image plane), and TL means optical total length. BFa means back focus (final lens to image plane * when parallel plate is converted into air), and TLa means optical total length (final lens to image surface * when parallel plate is converted into air). . In addition, the above code | symbol shall have the same meaning also in the subsequent Examples.

The single lens data of Example 1 is shown in Table 3 below.
[Table 3]
Lens number Surface number Focal length Effective diameter
Elem Surfs Focal Length Diameter
1 2- 3 3.0584 2.625
2 5- 6 -4.4284 2.282
3 8- 9 -24.2842 2.451
4 10-11 10.1673 3.036
5 12-13 -22.5866 3.431
6 14-15 2.0771 4.092
7 16-17 -1.9845 5.309

  FIG. 5 is a cross-sectional view of the imaging lens 11 and the like of the first embodiment. The imaging lens 11 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the third lens L3 having a substantially negative refractive power around the optical axis AX and having a concave surface facing the image side, and an object having a positive refractive power around the optical axis AX. A fourth meniscus lens L4 having a convex surface facing the side, a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and a convex surface facing the object side, and a positive refraction around the optical axis AX A biconvex sixth lens L6 having power, and a substantially plano-concave seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed. For example, a parallel plate (not shown) having an appropriate thickness can be disposed between the light incident surface of the first lens L1 and the object, and this is the same in the following embodiments.

  6A to 6C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 11 of Example 1, and FIGS. 6D and 6E show the examples. The lateral aberration of the imaging lens 11 of Example 1 is shown.

[Example 2]
The lens surface data of Example 2 is shown in Table 4 below.
[Table 4]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 1.8839 0.7264 1.54470 56 2.625
3 * -50.1886 0.0500 2.480
4 * 2.0288 0.1500 1.64250 22.5 2.292
5 * 1.2415 0.3882 2.063
STO INFINITY 0.0000 2.036
7 * 5.2021 0.2043 1.54470 56 2.090
8 * 4.9298 0.2511 2.223
9 * 9.5253 0.7848 1.54470 56 2.414
10 * 118.9988 0.1205 3.008
11 * 15.2856 0.2000 1.63469 23.9 3.333
12 * 8.0836 0.2599 3.455
13 * 4.3795 0.6318 1.54470 56 3.791
14 * -1.6267 0.2553 4.159
15 * -27.2355 0.3177 1.54470 56 4.665
16 * 1.1327 0.4000 5.218
17 INFINITY 0.1100 1.51633 64.1 5.493
18 INFINITY 0.4020

The aspherical coefficient of the lens surface of Example 2 is shown in Table 5 below.
[Table 5]
Second side
K = -7.59338e-001, A4 = 2.08234e-002, A6 = 4.99774e-003,
A8 = -4.58076e-003, A10 = 8.27955e-003, A12 = -5.18691e-003,
A14 = 1.47072e-003
Third side
K = 6.74025e + 001, A4 = 6.81816e-002, A6 = -9.93315e-002,
A8 = 1.10203e-001, A10 = -7.93473e-002, A12 = 3.36551e-002,
A14 = -6.08751e-003
4th page
K = -1.37510e + 001, A4 = 2.50648e-003, A6 = -7.11750e-002,
A8 = 7.47801e-002, A10 = -3.60636e-002, A12 = 1.28884e-002,
A14 = -3.54001e-003
5th page
K = -4.71840e + 000, A3 = -9.34023e-004, A4 = 2.93742e-004,
A5 = 9.55939e-003, A6 = 4.66981e-002, A8 = -1.27457e-001,
A10 = 1.76734e-001, A12 = -1.11648e-001, A14 = 3.01378e-002
7th page
K = -4.10655e + 001, A3 = -1.75932e-002, A4 = 2.72400e-002,
A5 = -1.77478e-001, A6 = 2.32086e-001, A8 = -1.98290e-001,
A10 = 1.31866e-001, A12 = -6.29209e-002, A14 = 2.34896e-002
8th page
K = 9.48496e + 000, A3 = -1.05131e-002, A4 = -1.33268e-001,
A5 = 1.49346e-003, A6 = 5.48097e-002, A8 = -4.55476e-002,
A10 = -1.29692e-003, A12 = 9.80091e-003, A14 = 4.66380e-003
9th page
K = 3.35953e + 001, A3 = -1.50895e-003, A4 = -9.85876e-002,
A5 = 4.13232e-003, A6 = 2.17094e-003, A8 = -9.42207e-003,
A10 = -1.29077e-002, A12 = 1.15085e-002, A14 = -1.31384e-003
10th page
K = 6.67705e + 001, A3 = -3.41426e-002, A4 = -9.74188e-002,
A5 = 8.68459e-002, A6 = -1.06440e-001, A8 = 5.09913e-002,
A10 = -1.63563e-002, A12 = 2.46831e-003
11th page
K = 1.54918e + 001, A3 = -1.03893e-002, A4 = -3.30208e-001,
A5 = 3.74362e-001, A6 = -2.61389e-001, A8 = 9.74168e-002,
A10 = -2.12897e-002, A12 = 1.57674e-003
12th page
K = 1.53465e + 001, A3 = -1.03295e-002, A4 = -2.51132e-001,
A5 = 1.56216e-001, A6 = -5.36108e-002, A8 = 7.24980e-003,
A10 = 6.53728e-003, A12 = -2.37960e-003, A14 = 1.86723e-004
Side 13
K = 3.09148e + 000, A3 = -2.68358e-002, A4 = 3.47136e-002,
A5 = -1.33828e-001, A6 = 1.09991e-001, A8 = -4.95611e-002,
A10 = 1.55961e-002, A12 = -2.39632e-003, A14 = 1.49314e-004
14th page
K = -1.03524e + 001, A3 = -4.58449e-002, A4 = -9.47123e-003,
A5 = 6.80135e-002, A6 = -1.72306e-002, A8 = -1.65561e-002,
A10 = 6.92533e-003, A12 = -1.07198e-003, A14 = 5.43027e-005
15th page
K = -1.24093e + 001, A3 = -1.25279e-001, A4 = -7.71861e-002,
A5 = 3.85764e-002, A6 = 2.27966e-002, A8 = -3.26167e-003,
A10 = -3.58406e-004, A12 = 9.11620e-005, A14 = -4.77516e-006
16th page
K = -5.59367e + 000, A3 = -7.74392e-002, A4 = -7.58586e-002,
A5 = 1.00112e-001, A6 = -3.51443e-002, A8 = 1.99857e-003,
A10 = -1.78001e-004, A12 = 1.49978e-005, A14 = -4.04444e-007

The characteristics of the imaging lens of Example 2 are listed below.
FL 4.035
Fno 1.54
w 71.98
Ymax 2.921
BF 0.912
TL 5.252
BFa 0.875
TLa 5.215

The single lens data of Example 2 is shown in Table 6 below.
[Table 6]
Elem Surfs Focal Length Diameter
1 2- 3 3.3500 2.625
2 4- 5 -5.3798 2.292
3 7- 8 -235.1066 2.223
4 9-10 18.9610 3.008
5 11-12 -27.3265 3.455
6 13-14 2.2615 4.159
7 15-16 -1.9887 5.218

  FIG. 7 is a cross-sectional view of the imaging lens 12 and the like of the second embodiment. The imaging lens 12 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a negative refractive power around the optical axis AX. A second meniscus lens L2 having a convex surface facing the object side, a third meniscus lens L3 having a weak negative refractive power around the optical axis AX and a convex surface facing the object side, and a positive lens around the optical axis AX. A substantially convex fourth lens L4 having a refracting power and a convex surface facing the object side, and a fifth meniscus lens L5 having a weak negative refracting power around the optical axis AX and a convex surface facing the object side, , A biconvex sixth lens L6 having a positive refractive power around the optical axis AX, and a substantially plano-concave seventh lens L7 having a negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and a light-shielding stop FS is disposed on the object side of the outer edge of the first lens L1.

  8A to 8C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 12 of Example 2, and FIGS. 4 shows lateral aberration of the imaging lens 12 of Example 2.

Example 3
The lens surface data of Example 3 is shown in Table 7 below.
[Table 7]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.2500 2.700
2 * 1.8265 0.7706 1.54470 56 2.633
3 * -9.8075 0.0500 2.483
4 * 2.2119 0.1796 1.63469 23.9 2.261
5 * 1.1650 0.3677 1.978
STO INFINITY 0.1500 1.963
7 * -15.7609 0.1900 1.54470 56 2.113
8 * 12.4701 0.1015 2.279
9 * 3.4709 0.6368 1.54470 56 2.595
10 * 13.7284 0.1000 2.996
11 * 6.9010 0.2000 1.63469 23.9 3.132
12 * 6.4920 0.5187 3.256
13 * 44.5000 0.4973 1.54470 56 3.591
14 * -1.1492 0.1749 3.914
15 * -5.2967 0.3007 1.54470 56 4.536
16 * 1.1765 0.7000 5.011
17 INFINITY 0.1100 1.51633 64.1 5.680
18 INFINITY 0.2024

The aspherical coefficients of the lens surfaces of Example 3 are shown in Table 8 below.
[Table 8]
Second side
K = -7.62402e-001, A4 = 2.04751e-002, A6 = 6.15415e-003,
A8 = -6.48276e-003, A10 = 8.84911e-003, A12 = -4.48738e-003,
A14 = 1.01834e-003
Third side
K = 9.83262e + 000, A4 = 9.78535e-002, A6 = -1.16417e-001,
A8 = 1.18654e-001, A10 = -7.95199e-002, A12 = 3.02924e-002,
A14 = -4.86274e-003
4th page
K = -1.88230e + 001, A4 = -8.39250e-004, A6 = -3.81024e-002,
A8 = 6.15429e-002, A10 = -4.95206e-002, A12 = 2.10021e-002,
A14 = -3.54000e-003
5th page
K = -5.13366e + 000, A3 = 9.20875e-003, A4 = 1.19772e-002,
A5 = 1.92273e-002, A6 = 5.03902e-002, A8 = -1.21332e-001,
A10 = 1.72304e-001, A12 = -1.22781e-001, A14 = 3.79822e-002
7th page
K = -8.00000e + 001, A3 = -1.31138e-002, A4 = 4.62154e-002,
A5 = -1.85231e-001, A6 = 2.34638e-001, A8 = -1.98611e-001,
A10 = 1.35696e-001, A12 = -5.04387e-002, A14 = 7.62898e-003
8th page
K = 4.88218e + 001, A3 = -1.80239e-002, A4 = -1.52562e-001,
A5 = 1.13531e-002, A6 = 6.54020e-002, A8 = -3.87499e-002,
A10 = 1.08407e-002, A12 = 9.52540e-003, A14 = -3.15667e-003
9th page
K = 2.06211e + 000, A3 = -1.95698e-002, A4 = -1.42525e-001,
A5 = 1.93943e-002, A6 = -8.24714e-003, A8 = 3.05060e-003,
A10 = 7.47791e-003, A12 = 1.72573e-003, A14 = -1.21519e-003
10th page
K = -8.00000e + 001, A3 = -2.74626e-002, A4 = -2.19898e-002,
A5 = 6.27652e-002, A6 = -1.24758e-001, A8 = 5.60335e-002,
A10 = -1.42980e-002, A12 = 2.03003e-003
11th page
K = 1.39238e + 001, A3 = -8.44025e-003, A4 = -3.28119e-001,
A5 = 3.72168e-001, A6 = -2.65022e-001, A8 = 9.88716e-002,
A10 = -2.05718e-002, A12 = 1.06740e-003
12th page
K = 1.34574e + 001, A3 = -1.32284e-002, A4 = -2.56059e-001,
A5 = 1.57577e-001, A6 = -5.11886e-002, A8 = 7.16231e-003,
A10 = 6.80037e-003, A12 = -2.26892e-003, A14 = 4.15564e-005
Side 13
K = 8.00000e + 001, A3 = -9.74745e-003, A4 = 1.71772e-002,
A5 = -1.27294e-001, A6 = 1.14521e-001, A8 = -4.81556e-002,
A10 = 1.49933e-002, A12 = -2.62088e-003, A14 = 2.30959e-004
14th page
K = -7.64107e + 000, A3 = -4.42792e-002, A4 = -7.79999e-002,
A5 = 9.16848e-002, A6 = -8.06985e-003, A8 = -1.69608e-002,
A10 = 6.70296e-003, A12 = -1.10843e-003, A14 = 6.64654e-005
15th page
K = -6.14130e + 001, A3 = -6.87097e-002, A4 = -9.91812e-002,
A5 = 3.63023e-002, A6 = 2.20450e-002, A8 = -2.94886e-003,
A10 = -3.32315e-004, A12 = 8.65810e-005, A14 = -4.83883e-006
16th page
K = -9.29155e + 000, A3 = -1.25830e-002, A4 = -1.28523e-001,
A5 = 1.02833e-001, A6 = -3.15161e-002, A8 = 1.69075e-003,
A10 = -1.99522e-004, A12 = 2.45502e-005, A14 = -1.11388e-006

The characteristics of the imaging lens of Example 3 are listed below.
FL 4.313
Fno 1.64
w 67.60
Ymax 2.921
BF 1.012
TL 5.250
BFa 0.975
TLa 5.213

The single lens data of Example 3 is shown in Table 9 below.
[Table 9]
Elem Surfs Focal Length Diameter
1 2- 3 2.8944 2.633
2 4- 5 -4.1550 2.261
3 7- 8 -12.7508 2.279
4 9-10 8.3456 2.996
5 11-12 -213.0273 3.256
6 13-14 2.0645 3.914
7 15-16 -1.7389 5.011

  FIG. 9 is a cross-sectional view of the imaging lens 13 and the like of the third embodiment. The imaging lens 13 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the third biconcave lens L3 having negative refractive power around the optical axis AX, and the fourth meniscus having positive refractive power around the optical axis AX and having a convex surface facing the object side. Lens L4, a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and having a convex surface facing the image side A substantially planoconvex sixth lens L6 and a biconcave seventh lens L7 having negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and a light-shielding stop FS is disposed on the object side of the outer edge of the first lens L1.

  FIGS. 10A to 10C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 13 of Example 3, and FIGS. 10D and 10E show the examples. The lateral aberration of the imaging lens 13 of Example 3 is shown.

Example 4
The lens surface data of Example 4 is shown in Table 10 below.
[Table 10]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 2.5918 0.6009 1.54470 56.2 2.613
3 * -7.2600 0.1267 2.504
STO INFINITY 0.0000 2.411
5 * 1.8163 0.1817 1.63469 23.9 2.273
6 * 1.1097 0.4600 2.104
7 FS INFINITY 0.0770 2.070
8 * 28.1195 0.3514 1.54470 56.2 2.107
9 * 27.7224 0.1000 2.366
10 * 5.5517 0.8520 1.54470 56 2.664
11 * 8.3094 0.1003 3.203
12 * 2.8251 0.2013 1.63469 23.9 3.464
13 * 2.7800 0.2356 3.560
14 * 6.3078 0.7518 1.54470 56.2 3.749
15 * -1.1548 0.2235 4.050
16 * 18.6734 0.3219 1.54470 56.2 4.932
17 * 0.9243 0.4000 5.406
18 INFINITY 0.1100 1.51633 64.1 6.000
19 INFINITY 0.4550

The aspherical coefficients of the lens surfaces of Example 4 are shown in Table 11 below.
[Table 11]
Second side
K = -4.76583e + 000, A4 = 4.42855e-002, A6 = -6.58009e-003,
A8 = -6.19443e-005, A10 = 5.47277e-003, A12 = -3.60429e-003,
A14 = 1.00936e-003
Third side
K = 5.49560e + 000, A4 = 1.01021e-001, A6 = -1.10909e-001,
A8 = 1.15203e-001, A10 = -7.86404e-002, A12 = 3.05405e-002,
A14 = -4.86004e-003
5th page
K = -9.85561e + 000, A4 = 1.06447e-002, A6 = -6.19262e-002,
A8 = 7.15486e-002, A10 = -5.64109e-002, A12 = 2.22086e-002,
A14 = -3.54001e-003
6th page
K = -3.75385e + 000, A3 = 1.14349e-003, A4 = -2.94492e-002,
A5 = -9.02417e-004, A6 = 8.64016e-002, A8 = -1.52161e-001,
A10 = 1.60552e-001, A12 = -9.67363e-002, A14 = 2.41152e-002
8th page
K = -8.00000e + 001, A3 = -1.64115e-002, A4 = 4.27003e-002,
A5 = -2.02100e-001, A6 = 2.18962e-001, A8 = -1.85348e-001,
A10 = 1.48282e-001, A12 = -7.99091e-002, A14 = 1.53464e-002
9th page
K = 0.00000e + 000, A4 = -1.55458e-001, A6 = 3.37252e-002,
A8 = -9.80294e-003, A10 = -1.20848e-003, A12 = -1.96857e-003
10th page
K = 0.00000e + 000, A4 = -1.25988e-001, A6 = 1.82637e-002,
A8 = 7.06854e-003, A10 = -5.43146e-003, A12 = 9.13575e-004
11th page
K = 2.43441e + 001, A3 = -9.29865e-002, A4 = -6.67967e-002,
A5 = 1.03039e-001, A6 = -1.23220e-001, A8 = 4.45057e-002,
A10 = -1.08582e-002, A12 = 1.02689e-003
12th page
K = -5.86781e-001, A3 = -6.83121e-002, A4 = -3.40600e-001,
A5 = 3.62293e-001, A6 = -2.72627e-001, A8 = 9.88045e-002,
A10 = -1.98267e-002, A12 = 1.44581e-003
Side 13
K = -6.43385e-001, A3 = 5.17390e-003, A4 = -2.77638e-001,
A5 = 1.40444e-001, A6 = -4.99045e-002, A8 = 5.67616e-003,
A10 = 6.07764e-003, A12 = -2.00730e-003, A14 = 1.75629e-004
14th page
K = -8.00000e + 001, A3 = 2.16910e-002, A4 = 4.18564e-002,
A5 = -1.23338e-001, A6 = 8.87382e-002, A8 = -4.21216e-002,
A10 = 1.65373e-002, A12 = -3.63450e-003, A14 = 3.51079e-004
15th page
K = -7.50573e + 000, A3 = -5.32180e-002, A4 = -8.29700e-002,
A5 = 1.03856e-001, A6 = -9.67792e-003, A8 = -1.77803e-002,
A10 = 6.65870e-003, A12 = -1.10205e-003, A14 = 7.11453e-005
16th page
K = -8.00000e + 001, A3 = -1.07678e-001, A4 = -9.02414e-002,
A5 = 3.30882e-002, A6 = 2.23725e-002, A8 = -2.55974e-003,
A10 = -3.39237e-004, A12 = 7.64085e-005, A14 = -3.88590e-006
17th page
K = -5.88595e + 000, A3 = 9.46200e-003, A4 = -1.50249e-001,
A5 = 1.12943e-001, A6 = -2.98435e-002, A8 = 1.31582e-003,
A10 = -2.21592e-004, A12 = 3.04412e-005, A14 = -1.38605e-006

The characteristics of the imaging lens of Example 4 are listed below.
FL 3.787
Fno 1.44
w 75.44
Ymax 2.921
BF 0.965
TL 5.549
BFa 0.928
TLa 5.512

The single lens data of Example 4 is shown in Table 12 below.
[Table 12]
Elem Surfs Focal Length Diameter
1 2- 3 3.5835 2.613
2 5- 6 -4.9929 2.273
3 8- 9 -5e + 003 2.366
4 10-11 27.6940 3.203
5 12-13 374.4482 3.560
6 14-15 1.8580 4.050
7 16-17 -1.7967 5.406

  FIG. 11 is a cross-sectional view of the imaging lens 14 and the like of the fourth embodiment. The imaging lens 14 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. Second lens L2, a substantially flat third lens L3 having a weak negative refractive power around the optical axis AX, and a meniscus having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side. The fourth lens L4, a fifth meniscus lens L5 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and a biconvex second lens having a positive refractive power around the optical axis AX. 6 lenses L6, and a meniscus seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed.

  12A to 12C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 14 of Example 4, and FIGS. 12D and 12E show the results. 10 shows lateral aberration of the imaging lens 14 of Example 4. FIG.

Example 5
The lens surface data of Example 5 is shown in Table 13 below.
[Table 13]
Surface number rd nd vd eff.dia.
STO INFINITY -0.2500 2.625
2 * 2.0635 0.7031 1.54470 56 2.625
3 * -8.2734 0.0500 2.493
4 * 2.2022 0.1957 1.63469 23.9 2.290
5 * 1.1925 0.4520 2.045
6 FS INFINITY 0.1000 2.040
7 * 47.5805 0.3000 1.54470 56 2.074
8 * 25.0398 0.0884 2.326
9 * 4.6503 0.9065 1.54470 56 2.828
10 * 52.3411 0.1642 3.208
11 * -1.7499 0.2004 1.63469 23.9 3.326
12 * -1.4313 0.0500 3.557
13 * 13.9998 0.4818 1.54470 56 3.698
14 * -20.0000 0.3261 4.129
15 * 1.2751 0.3604 1.54470 56 4.867
16 * 0.7678 0.6000 5.318
17 INFINITY 0.1100 1.51633 64.1 5.700
18 INFINITY 0.1419

The aspheric coefficients of the lens surfaces of Example 5 are shown in Table 14 below.
[Table 14]
Second side
K = -1.42862e + 000, A4 = 2.77675e-002, A6 = 5.43424e-003,
A8 = -6.07353e-003, A10 = 8.35891e-003, A12 = -4.15242e-003,
A14 = 9.53612e-004
Third side
K = -8.00000e + 001, A4 = 9.76993e-002, A6 = -1.24374e-001,
A8 = 1.24899e-001, A10 = -8.16539e-002, A12 = 3.04828e-002,
A14 = -4.86208e-003
4th page
K = -1.93605e + 001, A4 = 4.29146e-002, A6 = -9.25227e-002,
A8 = 9.66026e-002, A10 = -6.67212e-002, A12 = 2.46267e-002,
A14 = -3.54009e-003
5th page
K = -3.93582e + 000, A3 = -1.12833e-002, A4 = -3.64851e-002,
A5 = 3.27652e-002, A6 = 9.76461e-002, A8 = -1.58322e-001,
A10 = 1.37490e-001, A12 = -6.70341e-002, A14 = 1.50187e-002
7th page
K = 8.00000e + 001, A3 = -5.10427e-002, A4 = 1.39741e-001,
A5 = -3.81210e-001, A6 = 3.26202e-001, A8 = -1.70718e-001,
A10 = 7.85483e-002, A12 = -2.37923e-002, A14 = 1.81202e-003
8th page
K = 0.00000e + 000, A4 = -2.73521e-001, A6 = 1.78928e-001,
A8 = -8.65778e-002, A10 = 2.22277e-002, A12 = -1.85128e-003
9th page
K = 0.00000e + 000, A4 = -2.58118e-001, A6 = 1.43757e-001,
A8 = -2.48977e-002, A10 = -9.02995e-004, A12 = 6.19376e-004
10th page
K = 8.00000e + 001, A3 = -1.62229e-002, A4 = -1.27850e-001,
A5 = 6.36093e-002, A6 = -8.40529e-002, A8 = 6.12670e-002,
A10 = -2.25320e-002, A12 = 3.51866e-003
11th page
K = -2.65028e-001, A3 = 1.68317e-001, A4 = -2.36497e-001,
A5 = 3.68567e-001, A6 = -2.97211e-001, A8 = 9.30939e-002,
A10 = -1.81863e-002, A12 = 1.36314e-003
12th page
K = -5.58624e-001, A3 = 5.09014e-001, A4 = -4.45879e-001,
A5 = 1.53316e-001, A6 = -2.61242e-002, A8 = 5.47005e-003,
A10 = 4.88155e-003, A12 = -1.93135e-003, A14 = 1.64661e-004
Side 13
K = 5.39428e + 001, A3 = 3.27596e-001, A4 = -2.71244e-001,
A5 = -2.35007e-002, A6 = 1.23190e-001, A8 = -5.87165e-002,
A10 = 1.46150e-002, A12 = -1.99635e-003, A14 = 9.95736e-005
14th page
K = -8.00000e + 001, A3 = -4.14744e-001, A4 = 5.25797e-001,
A5 = -1.30899e-001, A6 = -1.89797e-002, A8 = -1.34729e-002,
A10 = 5.95330e-003, A12 = -8.74575e-004, A14 = 5.16865e-005
15th page
K = -1.43986e + 001, A3 = -3.35318e-001, A4 = 9.71430e-003,
A5 = 4.59226e-002, A6 = 1.67337e-002, A8 = -3.65987e-003,
A10 = -2.80541e-004, A12 = 9.56718e-005, A14 = -5.70973e-006
16th page
K = -6.17418e + 000, A3 = -1.20474e-002, A4 = -1.86539e-001,
A5 = 1.61058e-001, A6 = -4.60649e-002, A8 = 1.54960e-003,
A10 = -1.18236e-004, A12 = 2.46917e-005, A14 = -1.62982e-006

The characteristics of the imaging lens of Example 5 are listed below.
FL 3.791
Fno 1.44
w 75.43
Ymax 2.921
BF 0.852
TL 5.231
BFa 0.814
TLa 5.193

The single lens data of Example 5 is shown in Table 15 below.
[Table 15]
Lens number Surface number Focal length Effective diameter
Elem Surfs Focal Length Diameter
1 2- 3 3.1066 2.625
2 4- 5 -4.4312 2.290
3 7-8 -97.4945 2.326
4 9-10 9.3074 3.208
5 11-12 9.9549 3.557
6 13-14 15.1947 4.129
7 15-16 -4.7278 5.318

  FIG. 13 is a cross-sectional view of the imaging lens 15 and the like according to the fifth embodiment. The imaging lens 15 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the substantially flat third lens L3 having a weak negative refractive power around the optical axis AX, and a substantially convex having a positive refractive power around the optical axis AX and having a convex surface facing the object side. A fourth flat lens L4, a fifth meniscus lens L5 having a positive refractive power around the optical axis AX and having a convex surface facing the image side, and a positive refractive power around the optical axis AX and having a positive refractive power toward the object side A substantially convex sixth lens L6 having a convex surface and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and a concave surface facing the image side are provided. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1, and a light-shielding stop FS is disposed between the second and third lenses L2 and L3.

  14A to 14C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 15 of Example 5, and FIGS. 14D and 14E show the results. 10 shows lateral aberrations of the imaging lens 15 of Example 5. FIG.

Example 6
The lens surface data of Example 6 is shown in Table 16 below.
[Table 16]
Surface number rd nd vd eff.dia.
STO INFINITY 0.0000 2.700
2 * 2.3251 0.6383 1.54470 56.2 2.700
3 * -9.2494 0.0521 2.587
4 * 1.7704 0.1967 1.63469 23.9 2.366
5 * 1.1060 0.4161 2.145
6 FS INFINITY 0.2000 2.140
7 * -28.2481 0.5027 1.54470 56.2 2.235
8 * -2.3290 0.0500 2.513
9 * -3.8104 0.2954 1.54470 56 2.838
10 * 13.5740 0.1000 3.017
11 * 2.7825 0.2564 1.63469 23.9 3.230
12 * 2.1786 0.2785 3.493
13 * 5.0908 0.8611 1.54470 56.2 3.725
14 * -1.3327 0.3224 4.063
15 * 17.2266 0.3136 1.54470 56.2 5.048
16 * 1.0912 0.5000 5.404
17 INFINITY 0.1100 1.51633 64.1 6.000
18 INFINITY 0.3000

Table 17 below shows the aspheric coefficients of the lens surfaces of Example 6.
[Table 17]
Second side
K = 1.24460e-001, A4 = 1.21359e-002, A6 = -3.97961e-003,
A8 = 1.88173e-003, A10 = 4.52445e-003, A12 = -3.97779e-003,
A14 = 1.25422e-003
Third side
K = -5.56414e + 001, A4 = 9.20711e-002, A6 = -1.09643e-001,
A8 = 1.12194e-001, A10 = -7.63506e-002, A12 = 2.99446e-002,
A14 = -4.86273e-003
4th page
K = -1.05152e + 001, A4 = 3.23255e-002, A6 = -6.92713e-002,
A8 = 6.40918e-002, A10 = -4.63078e-002, A12 = 1.91343e-002,
A14 = -3.54001e-003
5th page
K = -4.03485e + 000, A3 = -2.04589e-003, A4 = -2.37788e-003,
A5 = 8.85235e-003, A6 = 6.88449e-002, A8 = -1.52149e-001,
A10 = 1.66834e-001, A12 = -9.65848e-002, A14 = 2.32001e-002
7th page
K = 8.00000e + 001, A3 = -1.90401e-002, A4 = 5.72740e-002,
A5 = -2.08223e-001, A6 = 2.04455e-001, A8 = -1.85643e-001,
A10 = 1.56796e-001, A12 = -8.93079e-002, A14 = 1.82997e-002
8th page
K = 0.00000e + 000, A4 = -1.49708e-002, A6 = -9.48676e-003,
A8 = -4.51000e-003, A10 = -3.33351e-003, A12 = -2.36607e-007
9th page
K = 0.00000e + 000, A4 = -1.49364e-002, A6 = 1.24234e-003,
A8 = -1.01890e-003, A10 = -2.09119e-003, A12 = 1.17089e-003
10th page
K = 7.42360e + 001, A3 = -3.97455e-002, A4 = -1.20038e-001,
A5 = 1.06377e-001, A6 = -1.02513e-001, A8 = 4.15394e-002,
A10 = -1.46593e-002, A12 = 2.14478e-003
11th page
K = -3.73865e + 000, A3 = -4.82487e-002, A4 = -3.48917e-001,
A5 = 3.62715e-001, A6 = -2.70247e-001, A8 = 1.02059e-001,
A10 = -1.92714e-002, A12 = 9.07473e-004
12th page
K = -6.13581e-001, A3 = -5.49125e-002, A4 = -2.54842e-001,
A5 = 1.47841e-001, A6 = -5.04353e-002, A8 = 4.63083e-003,
A10 = 5.97528e-003, A12 = -1.95441e-003, A14 = 1.59273e-004
Side 13
K = -6.65783e + 001, A3 = -3.86596e-002, A4 = 9.89763e-002,
A5 = -1.36689e-001, A6 = 8.42618e-002, A8 = -3.93065e-002,
A10 = 1.64657e-002, A12 = -3.88643e-003, A14 = 3.91002e-004
14th page
K = -8.18820e + 000, A3 = -7.54710e-002, A4 = -8.23716e-002,
A5 = 1.08396e-001, A6 = -1.21428e-002, A8 = -1.77832e-002,
A10 = 6.82192e-003, A12 = -1.09890e-003, A14 = 6.27220e-005
15th page
K = 3.55044e + 001, A3 = -1.10975e-001, A4 = -8.95831e-002,
A5 = 3.16786e-002, A6 = 2.20089e-002, A8 = -2.41082e-003,
A10 = -3.27637e-004, A12 = 7.07156e-005, A14 = -3.53132e-006
16th page
K = -5.69567e + 000, A3 = 4.22797e-003, A4 = -1.56719e-001,
A5 = 1.15555e-001, A6 = -2.94242e-002, A8 = 1.29740e-003,
A10 = -2.24042e-004, A12 = 3.11978e-005, A14 = -1.47148e-006

The characteristics of the imaging lens of Example 6 are listed below.
FL 3.786
Fno 1.44
w 75.44
Ymax 2.921
BF 0.910
TL 5.393
BFa 0.873
TLa 5.356

The single lens data of Example 6 is shown in Table 18 below.
[Table 18]
Elem Surfs Focal Length Diameter
1 2- 3 3.4788 2.700
2 4- 5 -5.2461 2.366
3 7- 8 4.6284 2.513
4 9-10 -5.4296 3.017
5 11-12 -18.9337 3.493
6 13-14 2.0353 4.063
7 15-16 -2.1536 5.404

  FIG. 15 is a cross-sectional view of the imaging lens 16 and the like according to the sixth embodiment. The imaging lens 16 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L 2, the substantially plano-convex third lens L 3 having a positive refractive power around the optical axis AX and having a convex surface facing the image side, and a biconcave lens having a negative refractive power around the optical axis AX. The fourth lens L4, a meniscus fifth lens L5 having a negative refractive power around the optical axis AX and having a convex surface facing the object side, and a biconvex sixth lens having a positive refractive power around the optical axis AX. A lens L6, and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1, and a light-shielding stop FS is disposed between the second and third lenses L2 and L3.

  16A to 16C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 16 of Example 6, and FIGS. 16D and 16E show the examples. The lateral aberration of the imaging lens 16 of Example 6 is shown.

Example 7
The lens surface data of Example 7 is shown in Table 19 below.
[Table 19]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 1.8014 0.7679 1.54470 56 2.625
3 * -25.8982 0.0500 2.475
4 * 2.4270 0.1500 1.63469 23.9 2.298
5 * 1.2926 0.3640 2.036
STO INFINITY 0.0000 2.018
7 * 5.2123 0.2221 1.54000 45 2.104
8 * 5.5759 0.2648 2.227
9 * 10.3502 0.7499 1.54470 56 2.389
10 * 72.3374 0.1383 2.985
11 * 12.0553 0.2000 1.63469 23.9 3.331
12 * 8.7474 0.2952 3.439
13 * 5.7117 0.5640 1.54470 56 3.785
14 * -1.6943 0.2600 4.142
15 * -16.2033 0.3139 1.54470 56 4.544
16 * 1.1957 0.4000 5.133
17 INFINITY 0.1100 1.51633 64.1 5.483
18 INFINITY 0.4000

Table 20 below shows the aspheric coefficients of the lens surfaces of Example 7.
[Table 20]
Second side
K = -7.40221e-001, A4 = 2.10580e-002, A6 = 5.74015e-003,
A8 = -4.21666e-003, A10 = 8.06261e-003, A12 = -5.09104e-003,
A14 = 1.41277e-003
Third side
K = 8.00000e + 001, A4 = 7.41141e-002, A6 = -1.05055e-001,
A8 = 1.13053e-001, A10 = -7.90913e-002, A12 = 3.26106e-002,
A14 = -5.75829e-003
4th page
K = -2.29584e + 001, A4 = -5.67348e-003, A6 = -5.78075e-002,
A8 = 7.21621e-002, A10 = -3.89383e-002, A12 = 1.46210e-002,
A14 = -3.54001e-003
5th page
K = -5.41421e + 000, A3 = -2.92949e-003, A4 = 8.18736e-003,
A5 = 1.57701e-002, A6 = 4.97446e-002, A8 = -1.26949e-001,
A10 = 1.76346e-001, A12 = -1.11323e-001, A14 = 3.21164e-002
7th page
K = -3.57283e + 001, A3 = -1.52257e-002, A4 = 3.17311e-002,
A5 = -1.75461e-001, A6 = 2.34233e-001, A8 = -1.99640e-001,
A10 = 1.33457e-001, A12 = -5.85237e-002, A14 = 2.02494e-002
8th page
K = 1.35931e + 001, A3 = -4.08096e-003, A4 = -1.33577e-001,
A5 = 4.78874e-003, A6 = 5.71950e-002, A8 = -4.70554e-002,
A10 = 1.39246e-003, A12 = 1.17779e-002, A14 = 1.56720e-003
9th page
K = 3.64032e + 001, A3 = 2.31875e-005, A4 = -1.05039e-001,
A5 = 4.30647e-003, A6 = -3.60461e-004, A8 = -8.17235e-003,
A10 = -9.45932e-003, A12 = 9.32529e-003, A14 = -1.86514e-003
10th page
K = -8.00000e + 001, A3 = -2.90834e-002, A4 = -9.73707e-002,
A5 = 8.47935e-002, A6 = -1.07118e-001, A8 = 5.12085e-002,
A10 = -1.58276e-002, A12 = 2.20358e-003
11th page
K = 1.66508e + 001, A3 = -6.88585e-003, A4 = -3.29408e-001,
A5 = 3.72791e-001, A6 = -2.62951e-001, A8 = 9.76559e-002,
A10 = -2.10110e-002, A12 = 1.50623e-003
12th page
K = 1.28367e + 001, A3 = -7.28568e-003, A4 = -2.51421e-001,
A5 = 1.57235e-001, A6 = -5.27596e-002, A8 = 7.28793e-003,
A10 = 6.57310e-003, A12 = -2.35825e-003, A14 = 1.80059e-004
Side 13
K = 4.12029e + 000, A3 = -2.00816e-002, A4 = 3.63279e-002,
A5 = -1.32483e-001, A6 = 1.10028e-001, A8 = -4.93752e-002,
A10 = 1.55553e-002, A12 = -2.40542e-003, A14 = 1.56883e-004
14th page
K = -1.15262e + 001, A3 = -4.55317e-002, A4 = -1.24586e-002,
A5 = 6.92369e-002, A6 = -1.69062e-002, A8 = -1.65327e-002,
A10 = 6.92685e-003, A12 = -1.07562e-003, A14 = 5.41552e-005
15th page
K = -7.30298e + 001, A3 = -1.23670e-001, A4 = -7.79516e-002,
A5 = 3.89205e-002, A6 = 2.27987e-002, A8 = -3.25600e-003,
A10 = -3.64818e-004, A12 = 8.98752e-005, A14 = -4.59874e-006
16th page
K = -6.05733e + 000, A3 = -7.93201e-002, A4 = -7.54336e-002,
A5 = 9.94779e-002, A6 = -3.51158e-002, A8 = 1.99822e-003,
A10 = -1.82351e-004, A12 = 1.55595e-005, A14 = -3.80652e-007

The characteristics of the imaging lens of Example 7 are listed below.
FL 4.188
Fno 1.60
w 70.00
Ymax 2.921
BF 0.910
TL 5.250
BFa 0.873
TLa 5.213

The single lens data of Example 7 is shown in Table 21 below.
[Table 21]
Elem Surfs Focal Length Diameter
1 2- 3 3.1226 2.625
2 4- 5 -4.5927 2.298
3 7- 8 121.9205 2.227
4 9-10 22.0802 2.985
5 11-12 -51.4344 3.439
6 13-14 2.4652 4.142
7 15-16 -2.0314 5.133

  FIG. 17 is a cross-sectional view of the imaging lens 17 and the like of the seventh embodiment. The imaging lens 17 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a negative refractive power around the optical axis AX. The second meniscus lens L2 having a convex surface facing the object side, the third meniscus lens L3 having a weak positive refractive power around the optical axis AX and the convex surface facing the object side, and weak around the optical axis AX A substantially convex fourth lens L4 having a positive refractive power and a convex surface facing the object side, and a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and a convex surface facing the object side And a biconvex sixth lens L6 having a positive refractive power around the optical axis AX and a biconcave seventh lens L7 having a negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and a light-shielding stop FS is disposed on the object side of the outer edge of the first lens L1.

  18A to 18C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 17 of Example 7, and FIGS. 18D and 18E show the examples. 10 shows lateral aberration of the imaging lens 17 of Example 7. FIG.

Example 8
The lens surface data of Example 8 is shown in Table 22 below.
[Table 22]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.1500 2.700
2 * 2.5717 0.6047 1.54470 56 2.610
3 * -7.0453 0.1420 2.497
STO INFINITY 0.0000 2.393
5 * 1.8236 0.1687 1.63469 23.9 2.264
6 * 1.1019 0.4572 2.108
7 FS INFINITY 0.1000 2.080
8 * 37.1918 0.3890 1.54470 56 2.135
9 * -21.8268 0.1039 2.412
10 * 8.3148 0.5705 1.54470 56 2.767
11 * 8.1875 0.1528 3.061
12 * 2.6709 0.2002 1.63469 23.9 3.376
13 * 4.4625 0.3514 3.442
14 * -18.8765 0.6658 1.54470 56 3.617
15 * -1.0741 0.2265 3.959
16 * -34.1129 0.3255 1.54470 56 4.849
17 * 0.9139 0.4000 5.376
18 INFINITY 0.1100 1.51633 64.1 6.000
19 INFINITY 0.4068

Table 23 below shows the aspheric coefficients of the lens surfaces of Example 8.
[Table 23]
Second side
K = -4.83126e + 000, A4 = 4.41063e-002, A6 = -6.70306e-003,
A8 = 9.50319e-005, A10 = 5.51386e-003, A12 = -3.75901e-003,
A14 = 1.10559e-003
Third side
K = 4.36307e + 000, A4 = 1.02298e-001, A6 = -1.10820e-001,
A8 = 1.13887e-001, A10 = -7.73968e-002, A12 = 3.02679e-002,
A14 = -4.85976e-003
5th page
K = -1.05288e + 001, A4 = 8.03773e-003, A6 = -6.31082e-002,
A8 = 7.23894e-002, A10 = -5.66858e-002, A12 = 2.19704e-002,
A14 = -3.54000e-003
6th page
K = -3.83762e + 000, A3 = 3.29363e-004, A4 = -2.84048e-002,
A5 = -2.17539e-003, A6 = 8.56233e-002, A8 = -1.51213e-001,
A10 = 1.60736e-001, A12 = -9.79742e-002, A14 = 2.46623e-002
8th page
K = 1.89728e + 001, A3 = -1.68594e-002, A4 = 4.52334e-002,
A5 = -2.02623e-001, A6 = 2.12537e-001, A8 = -1.83276e-001,
A10 = 1.49874e-001, A12 = -8.31354e-002, A14 = 1.63616e-002
9th page
K = 0.00000e + 000, A4 = -1.28346e-001, A6 = 1.68384e-002,
A8 = -1.39014e-003, A10 = -3.16422e-003, A12 = -1.96502e-003
10th page
K = 0.00000e + 000, A4 = -1.07253e-001, A6 = 1.33674e-002,
A8 = 8.06280e-003, A10 = -3.12697e-003, A12 = -2.27241e-005
11th page
K = 2.56707e + 001, A3 = -1.20100e-001, A4 = -6.97855e-002,
A5 = 1.11286e-001, A6 = -1.14865e-001, A8 = 4.31103e-002,
A10 = -1.23434e-002, A12 = 1.21780e-003
12th page
K = -2.92093e + 000, A3 = -7.14420e-002, A4 = -3.41254e-001,
A5 = 3.68325e-001, A6 = -2.69803e-001, A8 = 9.93874e-002,
A10 = -1.96777e-002, A12 = 1.33253e-003
Side 13
K = -2.13816e + 000, A3 = 3.31706e-002, A4 = -2.71094e-001,
A5 = 1.37274e-001, A6 = -4.95022e-002, A8 = 6.95182e-003,
A10 = 6.40153e-003, A12 = -2.02137e-003, A14 = 1.40635e-004
14th page
K = -7.97432e + 001, A3 = 2.83515e-002, A4 = 4.51436e-002,
A5 = -1.14595e-001, A6 = 8.66370e-002, A8 = -4.36467e-002,
A10 = 1.65817e-002, A12 = -3.57472e-003, A14 = 3.46104e-004
15th page
K = -6.84343e + 000, A3 = -3.72253e-002, A4 = -8.26052e-002,
A5 = 9.87743e-002, A6 = -1.12312e-002, A8 = -1.75794e-002,
A10 = 6.75883e-003, A12 = -1.08801e-003, A14 = 6.54569e-005
16th page
K = 7.96137e + 001, A3 = -8.98099e-002, A4 = -9.22669e-002,
A5 = 3.26750e-002, A6 = 2.22238e-002, A8 = -2.53460e-003,
A10 = -3.34788e-004, A12 = 7.56831e-005, A14 = -3.86230e-006
17th page
K = -6.46364e + 000, A3 = 1.49818e-004, A4 = -1.42290e-001,
A5 = 1.12197e-001, A6 = -3.04811e-002, A8 = 1.31927e-003,
A10 = -2.22673e-004, A12 = 3.03972e-005, A14 = -1.32693e-006

The characteristics of the imaging lens of Example 8 are listed below.
FL 3.793
Fno 1.44
w 75.44
Ymax 2.921
BF 0.917
TL 5.375
BFa 0.879
TLa 5.337

The single lens data of Example 8 is shown in Table 24 below.
[Table 24]
Elem Surfs Focal Length Diameter
1 2- 3 3.5372 2.610
2 5- 6 -4.8250 2.264
3 8- 9 25.3105 2.412
4 10-11 1691.5727 3.061
5 12-13 10.0455 3.442
6 14-15 2.0637 3.959
7 16-17 -1.6287 5.376

  FIG. 19 is a cross-sectional view of the imaging lens 18 and the like of the eighth embodiment. The imaging lens 18 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. Second lens L2, a substantially flat third lens L3 having a weak positive refractive power around the optical axis AX, and a meniscus having a weak positive refractive power around the optical axis AX and a convex surface facing the object side. The fourth lens L4, a fifth meniscus lens L5 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and a convex surface facing the image side A sixth meniscus lens L6 directed to the right side, and a substantially plano-concave seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed.

  20A to 20C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 18 of Example 8, and FIGS. 20D and 20E show the results. 10 shows lateral aberration of the imaging lens 18 of Example 8. FIG.

Example 9
The lens surface data of Example 9 is shown in Table 25 below.
[Table 25]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 2.0234 0.7031 1.54470 56 2.625
3 * -8.9993 0.0500 2.495
STO INFINITY 0.0000 2.460
5 * 2.1912 0.1872 1.63469 23.9 2.290
6 * 1.2026 0.3963 2.047
7 FS INFINITY 0.1500 2.100
8 * 33.0211 0.3000 1.54470 56 2.181
9 * 20.3240 0.0921 2.421
10 * 4.4582 0.7987 1.54470 56 3.025
11 * 10.7911 0.2198 3.263
12 * -5.5339 0.2000 1.63469 23.9 3.446
13 * -2.7265 0.0500 3.718
14 * -19.7175 0.5492 1.54470 56 3.820
15 * -4.1358 0.2779 4.230
16 * 1.2438 0.3411 1.54470 56 4.832
17 * 0.7091 0.4000 5.347
18 INFINITY 0.1100 1.51633 64.1 5.642
19 INFINITY 0.3350

Table 26 below shows the aspheric coefficients of the lens surfaces of Example 9.
[Table 26]
Second side
K = -1.39095e + 000, A4 = 2.74220e-002, A6 = 6.42703e-003,
A8 = -7.94158e-003, A10 = 9.75374e-003, A12 = -4.65859e-003,
A14 = 1.00516e-003
Third side
K = -8.00000e + 001, A4 = 9.80286e-002, A6 = -1.24570e-001,
A8 = 1.24848e-001, A10 = -8.16542e-002, A12 = 3.04880e-002,
A14 = -4.86278e-003
5th page
K = -1.93604e + 001, A4 = 4.28866e-002, A6 = -8.93068e-002,
A8 = 9.66026e-002, A10 = -6.67212e-002, A12 = 2.43946e-002,
A14 = -3.54002e-003
6th page
K = -3.94629e + 000, A3 = -1.27730e-002, A4 = -3.64851e-002,
A5 = 3.27652e-002, A6 = 1.01463e-001, A8 = -1.58322e-001,
A10 = 1.37490e-001, A12 = -6.69981e-002, A14 = 1.50187e-002
8th page
K = 8.00000e + 001, A3 = -4.90380e-002, A4 = 1.34760e-001,
A5 = -3.81210e-001, A6 = 3.26202e-001, A8 = -1.70718e-001,
A10 = 7.59383e-002, A12 = -2.16692e-002, A14 = 1.81216e-003
9th page
K = 0.00000e + 000, A4 = -2.68988e-001, A6 = 1.73129e-001,
A8 = -8.56192e-002, A10 = 2.18613e-002, A12 = -1.97464e-003
10th page
K = 0.00000e + 000, A4 = -2.58118e-001, A6 = 1.43930e-001,
A8 = -2.48977e-002, A10 = -8.75304e-004, A12 = 6.19381e-004
11th page
K = 3.28638e + 001, A3 = -3.60092e-002, A4 = -1.23393e-001,
A5 = 7.04971e-002, A6 = -8.98671e-002, A8 = 6.06511e-002,
A10 = -2.10678e-002, A12 = 3.25224e-003
12th page
K = 7.14544e + 000, A3 = -3.46988e-002, A4 = -2.03350e-001,
A5 = 3.75098e-001, A6 = -2.89325e-001, A8 = 9.05873e-002,
A10 = -1.87320e-002, A12 = 1.50386e-003
Side 13
K = 8.75551e-001, A3 = 3.25418e-001, A4 = -4.06240e-001,
A5 = 1.73562e-001, A6 = -3.24475e-002, A8 = 3.99963e-003,
A10 = 4.74560e-003, A12 = -1.81839e-003, A14 = 1.62471e-004
14th page
K = 3.80208e + 001, A3 = 3.95727e-001, A4 = -2.73772e-001,
A5 = -7.77810e-002, A6 = 1.56779e-001, A8 = -5.98064e-002,
A10 = 1.42828e-002, A12 = -2.27568e-003, A14 = 2.01690e-004
15th page
K = -8.00000e + 001, A3 = -3.12479e-001, A4 = 3.60011e-001,
A5 = -4.55743e-002, A6 = -2.78295e-002, A8 = -1.60820e-002,
A10 = 6.31768e-003, A12 = -8.45855e-004, A14 = 4.54774e-005
16th page
K = -1.39025e + 001, A3 = -3.40057e-001, A4 = 1.72052e-002,
A5 = 3.95350e-002, A6 = 1.70899e-002, A8 = -3.54178e-003,
A10 = -2.92023e-004, A12 = 1.01459e-004, A14 = -6.32294e-006
17th page
K = -5.56221e + 000, A3 = -1.16361e-002, A4 = -2.01889e-001,
A5 = 1.68552e-001, A6 = -4.68669e-002, A8 = 1.72489e-003,
A10 = -1.38224e-004, A12 = 1.50601e-005, A14 = -5.50199e-007

The characteristics of the imaging lens of Example 9 are listed below.
FL 3.792
Fno 1.44
w 75.44
Ymax 2.921
BF 0.845
TL 5.160
BFa 0.808
TLa 5.123

The single lens data of Example 9 is shown in Table 27 below.
[Table 27]
Elem Surfs Focal Length Diameter
1 2- 3 3.1026 2.625
2 5- 6 -4.5329 2.290
3 8- 9 -97.8521 2.421
4 10-11 13.3524 3.263
5 12-13 8.2401 3.718
6 14-15 9.4902 4.230
7 16-17 -3.9065 5.347

  FIG. 21 is a cross-sectional view of the imaging lens 19 and the like of the ninth embodiment. The imaging lens 19 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. Second lens L2, a substantially flat third lens L3 having a weak negative refractive power around the optical axis AX, and a meniscus having a positive refractive power around the optical axis AX and a convex surface facing the object side. A fourth lens L4, a fifth lens L5 having a positive refractive power around the optical axis AX and having a convex surface facing the image side, and a positive refractive power around the optical axis AX and a convex surface facing the image side. And a sixth meniscus lens L6 having a negative refractive power around the optical axis AX and a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed.

  22A to 22C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 19 of Example 9, and FIGS. 22D and 22E show the results. 10 shows lateral aberrations of the imaging lens 19 of Example 9. FIG.

Example 10
The lens surface data of Example 10 is shown in Table 28 below.
[Table 28]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.2000 2.700
2 * 1.7926 0.7626 1.54470 56 2.625
3 * -113.1622 0.0500 2.469
4 * 2.0165 0.1500 1.64250 22.5 2.266
5 * 1.2311 0.3674 2.020
STO INFINITY 0.0000 2.018
7 * 4.9714 0.1916 1.54470 56 1.984
8 * 4.3740 0.1263 2.117
9 FS INFINITY 0.1000 2.300
10 * 7.2467 0.6640 1.54470 56 2.353
11 * 17.5412 0.1156 2.897
12 * 9.4860 0.2000 1.63469 23.9 3.275
13 * 7.6337 0.2788 3.347
14 * 4.8348 0.5099 1.54470 56 3.683
15 * -1.9176 0.2670 4.073
16 * 16.6282 0.3070 1.54470 56 4.440
17 * 1.1354 0.7000 4.979
18 INFINITY 0.1100 1.51633 64.1 5.731
19 INFINITY 0.0998

Table 29 below shows the aspheric coefficients of the lens surfaces of Example 10.
[Table 29]
Second side
K = -7.32448e-001, A4 = 2.12231e-002, A6 = 6.01622e-003,
A8 = -4.42254e-003, A10 = 8.28630e-003, A12 = -5.19321e-003,
A14 = 1.46425e-003
Third side
K = 2.28201e + 001, A4 = 6.82123e-002, A6 = -9.93415e-002,
A8 = 1.09933e-001, A10 = -7.95018e-002, A12 = 3.36150e-002,
A14 = -6.08554e-003
4th page
K = -1.26928e + 001, A4 = 3.42206e-003, A6 = -7.10144e-002,
A8 = 7.46353e-002, A10 = -3.63313e-002, A12 = 1.26443e-002,
A14 = -3.53992e-003
5th page
K = -4.48550e + 000, A3 = 1.82361e-003, A4 = 3.33830e-003,
A5 = 1.21468e-002, A6 = 4.89244e-002, A8 = -1.25901e-001,
A10 = 1.77743e-001, A12 = -1.10878e-001, A14 = 3.09625e-002
7th page
K = -3.73773e + 001, A3 = -1.25000e-002, A4 = 3.00205e-002,
A5 = -1.74971e-001, A6 = 2.33954e-001, A8 = -1.97628e-001,
A10 = 1.32321e-001, A12 = -6.23170e-002, A14 = 2.40171e-002
8th page
K = 9.87345e + 000, A3 = -9.49519e-003, A4 = -1.30748e-001,
A5 = 2.64057e-003, A6 = 5.47750e-002, A8 = -4.64005e-002,
A10 = -2.01369e-003, A12 = 9.48386e-003, A14 = 4.85948e-003
10th page
K = 2.77556e + 001, A3 = -3.00569e-003, A4 = -9.96057e-002,
A5 = 4.90875e-003, A6 = 3.29525e-003, A8 = -8.50991e-003,
A10 = -1.21297e-002, A12 = 1.19899e-002, A14 = -1.27631e-003
11th page
K = -8.00000e + 001, A3 = -2.32217e-002, A4 = -9.75271e-002,
A5 = 8.65383e-002, A6 = -1.05897e-001, A8 = 5.17257e-002,
A10 = -1.57755e-002, A12 = 2.73074e-003
12th page
K = 2.53322e + 001, A3 = 1.31110e-002, A4 = -3.38542e-001,
A5 = 3.76536e-001, A6 = -2.61788e-001, A8 = 9.73605e-002,
A10 = -2.13223e-002, A12 = 1.55861e-003
Side 13
K = 1.44930e + 001, A3 = 4.49894e-003, A4 = -2.56010e-001,
A5 = 1.53023e-001, A6 = -4.93515e-002, A8 = 7.42384e-003,
A10 = 6.52683e-003, A12 = -2.39653e-003, A14 = 1.77958e-004
14th page
K = 3.66614e + 000, A3 = -2.07704e-002, A4 = 3.71577e-002,
A5 = -1.33577e-001, A6 = 1.09656e-001, A8 = -4.95926e-002,
A10 = 1.56191e-002, A12 = -2.48831e-003, A14 = 1.75730e-004
15th page
K = -1.92320e + 001, A3 = -1.17213e-001, A4 = 6.44529e-002,
A5 = 4.54852e-002, A6 = -1.75417e-002, A8 = -1.54415e-002,
A10 = 6.78594e-003, A12 = -1.09352e-003, A14 = 5.85870e-005
16th page
K = 8.56893e + 000, A3 = -2.17398e-001, A4 = -4.20510e-002,
A5 = 4.34765e-002, A6 = 2.12869e-002, A8 = -3.70499e-003,
A10 = -3.61592e-004, A12 = 9.74898e-005, A14 = -4.92407e-006
17th page
K = -6.13137e + 000, A3 = -1.08921e-001, A4 = -5.65300e-002,
A5 = 9.82497e-002, A6 = -3.75212e-002, A8 = 2.17622e-003,
A10 = -1.88382e-004, A12 = 9.43182e-006, A14 = 6.05016e-007

The characteristics of the imaging lens of Example 10 are listed below.
FL 4.027
Fno 1.53
w 72.16
Ymax 2.921
BF 0.910
TL 5.000
BFa 0.872
TLa 4.962

The single lens data of Example 10 is shown in Table 30 below.
[Table 30]
Elem Surfs Focal Length Diameter
1 2- 3 3.2473 2.625
2 4- 5 -5.3172 2.266
3 7-8 -75.3346 2.117
4 10-11 22.1651 2.897
5 12-13 -64.2873 3.347
6 14-15 2.5897 4.073
7 16-17 -2.2530 4.979

  FIG. 23 is a cross-sectional view of the imaging lens 20 and the like of the tenth embodiment. The imaging lens 20 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a negative refractive power around the optical axis AX. The second meniscus lens L2 having a convex surface facing the object side, the third meniscus lens L3 having a weak negative refractive power around the optical axis AX and the convex surface facing the object side, and weak around the optical axis AX A fourth meniscus lens L4 having a positive refractive power and having a convex surface facing the object side; a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and having a convex surface facing the object side; A biconvex sixth lens L6 having a positive refractive power around the optical axis AX, and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. A light-shielding stop FS is disposed.

  24A to 24C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 20 of Example 10, and FIGS. 24D and 24E show the examples. The lateral aberration of the imaging lens 20 of Example 10 is shown.

Table 31 below summarizes the values of Examples 1 to 10 corresponding to the conditional expressions (1) to (12) for reference.
[Table 31]

  In the above, the present invention has been described based on the embodiments and examples, but the present invention is not limited to the above-described embodiments and the like. For example, the aperture stop AS can be directly supported by the lens barrel portion 54a, but can be fixed to a flange portion extending to the outside of one adjacent lens, or the outside of a pair of adjacent lenses. And can be fixed by being sandwiched between flange portions extending in the direction. Although the light-shielding stop FS can also be directly supported by the lens barrel portion 54a, it can be fixed to a flange portion that extends to the outside of one adjacent lens, or extends to the outside of a pair of adjacent lenses. It can be fixed by being sandwiched between flange portions.

  The aperture stop AS and the light-shielding stop FS are not limited to metal plates, but can be plate members made of resin or ceramics, and can also be incorporated by painting the flange portion of the lens with a light-shielding material. Further, the aperture stop AS and the light-shielding stop FS are not limited to a complete light-shielding body, and may be one that performs light reduction outside the aperture. When the light-shielding stop FS is a light-shielding plate or the like, a plurality of light-shielding plates or the like can be arranged between a pair of lenses.

  DESCRIPTION OF SYMBOLS 10,11-20 ... Imaging lens 50 ... Camera module 51 ... Imaging device 100 ... Imaging device 300 ... Portable communication terminal AX ... Optical axis L1-L7 ... Lens, AS, FS ... Aperture

Claims (25)

In order from the object side, a positive first lens, a negative second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens,
The image side surface of the seventh lens has an aspheric shape, has an extreme value within an effective diameter other than the center,
An imaging lens that satisfies the following conditional expression.
1.5 <ET2 / CT2 <3.0 (1)
CT2: Center thickness of the second lens ET2: Edge thickness of the second lens However, the edge thickness of the second lens is smaller between the effective diameter of the object side surface and the effective diameter of the image side surface of the second lens The thickness in the direction of the optical axis at the position of the diameter   The imaging lens according to claim 1, wherein the seventh lens is a negative lens.   The imaging lens according to claim 2, wherein the seventh lens has a concave surface facing the image side in the vicinity of the optical axis.   The imaging lens according to claim 1, wherein an object side surface of the seventh lens has an aspheric shape.   5. The imaging lens according to claim 1, wherein each lens from the third lens to the sixth lens has an aspheric surface on at least one side.   The imaging lens according to claim 1, wherein the first lens has a convex surface directed toward the object side.   The imaging lens according to claim 1, wherein the second lens has a concave surface facing the image side.   The imaging lens according to claim 7, wherein the second lens is a meniscus lens having a convex surface directed toward the object side.   The imaging lens according to claim 1, wherein the sixth lens has a convex surface facing the image side.   The imaging lens according to claim 1, further comprising an aperture stop closer to the object side than the third lens.   The imaging lens according to claim 1, wherein at least one of the fifth lens and the sixth lens is a positive lens. The imaging lens according to any one of claims 1 to 11, which satisfies the following conditional expression.
0.4 <f3456 / f <1.1 (2)
f3456: Composite focal length from the third lens to the sixth lens f: Focal length of the entire system The imaging lens according to any one of claims 1 to 12, which satisfies the following conditional expression.
0.5 <f1 / f <1.3 (3)
f1: Focal length of the first lens f: Focal length of the entire system The imaging lens according to any one of claims 1 to 13, which satisfies the following conditional expression.
−2.5 <f2 / f <−0.8 (4)
f2: focal length of the second lens f: focal length of the entire system The imaging lens according to claim 1, which satisfies the following conditional expression.
−2.0 <f7 / f <−0.30 (5)
f7: focal length of the seventh lens f: focal length of the entire system The imaging lens according to claim 1, which satisfies the following conditional expression.
1.3 <CT1 / ET1 <5.0 (6)
CT1: Center thickness of the first lens ET1: Edge thickness of the first lens However, the edge thickness of the first lens is smaller between the effective diameter of the object side surface and the effective diameter of the image side surface of the first lens. The thickness in the direction of the optical axis at the position of the diameter An aperture member having at least two predetermined apertures including an aperture stop closer to the object side than the third lens;
Of the diaphragm members, the diaphragm member having the smallest opening diameter is disposed closest to the image side,
The imaging lens according to claim 1, which satisfies the following conditional expression.
1.05 <Φmax / Φmin <1.45 (7)
Φmax: the largest aperture diameter of the aperture members disposed on the object side of the third lens Φmin: the smallest aperture diameter of the aperture members disposed on the object side of the third lens The imaging lens according to claim 1, which satisfies the following conditional expression.
1.0 <ΦL1 / ΦL2 <1.2 (8)
ΦL1: Maximum effective diameter of the first lens ΦL2: Maximum effective diameter of the second lens The imaging lens according to claim 1, which satisfies the following conditional expression.
0.51 <ΦL1 / f <0.75 (9)
ΦL1: Maximum effective diameter of the first lens f: Focal length of the entire system On the image side surface of the third lens, an area of 80% or more of the effective diameter is inclined toward the object side,
The third lens has a positive power near the end of the effective diameter,
On the image side surface of the fourth lens, an area of 80% or more of the effective diameter is inclined toward the object side,
The fourth lens has a positive power near the end of the effective diameter,
The imaging lens according to claim 1, wherein the fifth lens has a negative power near an end of an effective diameter. The imaging lens according to claim 1, which satisfies the following conditional expression.
0.05 <L5T / TTL <0.15 (10)
L5T: distance in the optical axis direction from the most convex portion on the object side surface of the fifth lens to the object side on the object side surface to the most convex portion on the image side surface on the image side. TTL: total optical length The imaging lens according to any one of claims 1 to 21, which satisfies the following conditional expression.
10 ° <θS8 <60 ° (11)
−25 ° <θS10 <10 ° (12)
θS8: Maximum surface angle within the effective diameter of the fourth lens image side surface θS10: Minimum surface angle at 80% to 10% of the effective diameter of the fifth lens image side surface However, the surface angle is parallel to the optical axis perpendicular line 0 °, positive value when tilted to the object side, negative value when tilted to the image side   The imaging lens according to claim 1, further comprising an optical element having substantially no power.   An imaging apparatus comprising the imaging lens according to any one of claims 1 to 23 and the imaging element.   A portable terminal comprising the imaging device according to claim 24.

Images