JP2014153577A - Imaging lens, and imaging device and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a five-lens imaging lens that causes less stray light while being smaller than conventional types, and that has excellently corrected various aberrations.SOLUTION: An imaging lens 10 forms a subject image on an imaging surface (projected surface) I of an imaging element 51, and comprises, in order from an object side: a positive first lens L1 having a convex surface facing the object side in the vicinity of an optical axis AX; a second lens L2 that is negative in the vicinity of the optical axis AX; a third lens L3; a fourth lens L4; and a negative fifth lens L5 having a concave surface facing an image side in the vicinity of the optical axis AX. In this imaging lens 10, since an image-side surface S32 a third lens L3 is inclined toward an image side at an effective diameter position at which the image-side surface S32 intersects with a dotted line, and marginal rays of a pencil of light rays that is formed having a maximum image height is thereby flipped up on the image-side surface S32 of the third lens L3, it is easy to cause light after passing through the third lens L3 to have a large angle with respect to the optical axis AX, which is advantageous to having a low profile.

Description

  The present invention relates to a small imaging lens, an imaging apparatus, and a portable terminal that suppress stray light. In particular, the present invention relates to an imaging lens, an imaging apparatus, and a portable terminal that have five lenses and are suitable for a low profile.

  In recent years, along with the improvement in performance and miniaturization of an image sensor using an image sensor such as a CCD (Charged Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor, a mobile phone or mobile phone equipped with an image pickup device Information terminals are spreading. More recently, with the increase in size and definition of the display elements mounted on the portable information terminals as described above, the imaging elements are also required to have higher pixels. There is a growing demand for higher performance. As an imaging lens for such an application, since a higher performance is possible compared with a lens having three or four lenses, an imaging lens having a five-lens configuration has been proposed (for example, see Patent Document 1). On the other hand, there is a demand for thinner portable information terminals, and there is an increasing demand for lowering the height of an imaging lens mounted on an imaging device. Low profile is needed. However, when the height is lowered, the distance that the light travels in the optical axis direction is shortened, but the distance that the light travels in the vertical direction of the optical axis is not changed. Light is likely to enter outside the effective area of the lens, and stray light is likely to be generated as a result.

  As a countermeasure against this stray light, as a five-lens imaging lens having a light-shielding diaphragm in addition to the aperture diaphragm, a first lens having a positive refractive power in order from the object side, a second lens, and a third lens; A fourth lens, and a fifth lens that is an aspherical surface having at least one inflection point, a light-shielding stop fixed between the first lens and the third lens, and a third lens to a fifth lens. An imaging lens including a light-shielding diaphragm fixed between the lenses is disclosed (see Patent Document 2).

  However, in the imaging lens described in Patent Document 2, the shape of the image side surface of the third lens is close to a convex surface having no inflection point, and when the height is lowered, the divergence of the peripheral ray of the light beam formed at the peripheral image height Is dependent only on the concave surface of the second lens, and a large aberration occurs due to strong refraction, making it difficult to achieve high performance.

International Publication No. 2010/024198 China Utility Model Notification No. 202330849

  The present invention has been made in view of such problems, and provides a five-lens imaging lens that is smaller than a conventional type, has less stray light, and has various aberrations corrected satisfactorily. With the goal.

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.
L / 2Y <0.90 (15)
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 <0.78 (15 ′)

  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 having a convex surface directed toward the object side, a second lens, a third lens, a fourth lens, and an image. A fifth lens having a concave surface facing the side, the image side surface of the fifth lens is aspheric and has an inflection point within the effective diameter, and at least one of the second lens and the third lens is a negative lens, The aperture stop is closer to the object side than the third lens, has a light-shielding stop between the third lens and the fourth lens, and between the fourth lens and the fifth lens, and the image side surface of the third lens is It has an inflection point, and part or all of 70% or more of the effective diameter has negative power.

In the imaging lens according to the present invention, since the first lens has a convex surface directed toward the object side, the principal point position of the entire system is close to the object side, which is advantageous for shortening the optical total length. In addition, since the back focus can be extended by making the image side surface of the fifth lens concave, it is possible to secure a desired back focus necessary for arranging the AF mechanism or the like. Furthermore, by making the image side surface of the fifth lens an aspherical surface having an inflection point within the effective diameter, the incident angle when a light beam having a peripheral image height is incident on the image surface can be kept small. The light receiving efficiency of the sensor when using the image sensor can be improved. By arranging the aperture stop closer to the object side than the third lens, the exit pupil can be moved away from the image plane, so that the sensor incident angle can be kept small.
In order to reduce the height of an imaging lens having five lenses as in the present invention, the main point position of the entire system is brought closer to the object side by collecting positive power to the object side lens among the five lenses, Furthermore, it is necessary to reduce the area occupied by the lenses by reducing the distance between the lenses. In addition, when the aperture is increased, a large spherical aberration occurs on the convex surface on the object side of the first lens, so it is necessary to correct the spherical aberration with the second and subsequent lenses. In that case, since a negative lens with a high axial ray height can effectively correct spherical aberration, at least one of the second lens and the third lens having a high axial ray height close to the object side is used as a negative lens. By doing so, it is possible to effectively correct the spherical aberration. However, as the height is lowered, the light incident on the imaging lens at a field angle larger than the maximum field angle has a large angle with respect to the optical axis after passing through the negative lens. The light enters the outside of the effective diameter, and stray light is likely to be generated.
Therefore, in the first imaging lens, stray light can be avoided by arranging a light-shielding diaphragm between the third and fourth lenses and between the fourth and fifth lenses. Further, since the image side surface of the third lens is tilted toward the image side at the effective diameter position, the peripheral ray of the light bundle formed at the maximum image height is bounced up on the image side surface of the third lens. It becomes easy to give a later light beam a large angle with respect to the optical axis, which is advantageous in reducing the height.
Further, the image side surface of the third lens has an inflection point, and a part or all of 70% or more of the effective diameter has negative power. Negative power means that when a parallel light beam is incident, the light beam is refracted in a direction away from the optical axis. When parallel rays are refracted in a direction away from the optical axis in a part within the effective diameter, a part of the surface is said to have negative power. In this way, a part or the whole of 70% or more of the effective diameter of the third lens has a negative power, so that the peripheral ray of the light bundle formed at the maximum image height is on the image side surface of the third lens. Since it is flipped up, it becomes easy to give the light beam after passing through the third lens a large angle with respect to the optical axis, which is advantageous in reducing the height.

  Here, for the object side surface of the first lens or the image side surface of the fifth lens, when the shape up to 50% of the effective diameter is fitted by the least square method with only the R term, if the center of curvature is on the air side, it is concave. If the side is defined as convex. In addition, as to only this specification, the above definition applies unless otherwise specified in the vicinity of the optical axis and the vicinity of the optical axis.

In another aspect of the present invention, in the imaging lens, the object side surface of the fourth lens has an aspheric shape, and conditional expression (1)
0.015 <AS7 / f <0.07 (1)
However,
AS7: Maximum deviation (mm) between the aspherical shape of the object side surface of the fourth lens and the spherical shape connecting the effective diameter position and the center point of the fourth lens
f: Satisfies the focal length of the entire imaging lens system.

  The peripheral part of the object side surface of the fourth lens is refracted by making the surface angle close to perpendicular to the light beam that is refracted by the third lens and forms a peripheral image height having a large angle with the optical axis. The angle can be kept small, and the occurrence of coma and the like can be suppressed. However, if the surface angle of the peripheral part is made perpendicular to the light beam while maintaining a shape close to a spherical shape, the amount of sag on the surface increases and the area of the fourth lens occupying the entire optical length increases. It will be a hindrance. Since the object side surface of the fourth lens has an aspherical shape and the value AS7 / f exceeds the lower limit of the conditional expression (1), a shape deviating from the spherical shape can be obtained. Even when the sapphire is made perpendicular to the light beam, the sag amount of the surface can be made small, which is advantageous for reducing the height. On the other hand, when the value AS7 / f is less than the upper limit of the conditional expression (1), it is possible to prevent the deviation from the spherical shape from becoming too large and impairing the moldability of the lens.

The value AS7 / f is more preferably in the range of the following formula.
0.02 <AS7 / f <0.05 (1 ′)

In still another aspect of the present invention, conditional expression (2)
0.75 <dΦ / dz <2.5 (2)
dΦ: difference between the diameter of the light-shielding diaphragm between the fourth and fifth lenses and the diameter of the light-shielding diaphragm between the third and fourth lenses dz: between the light-shielding diaphragm between the fourth and fifth lenses and the third and fourth lenses The distance from the light-shielding diaphragm is satisfied.

Stray light can be avoided by satisfying the conditional expression (2) between the light-shielding stop I between the third and fourth lenses and the light-shielding stop II between the fourth and fifth lenses. When the value dΦ / dz of conditional expression (2) exceeds the lower limit, the diameter of the light-shielding diaphragm I between the third and fourth lenses becomes smaller than the diameter of the light-shielding diaphragm II between the fourth and fifth lenses. Since the flange portion of the fourth lens can be sufficiently shielded even with respect to light rays having a large angle with respect to the optical axis emitted from the three lenses, stray light caused by the incidence of light rays on the flange portion of the fourth lens can be prevented. Occurrence can be prevented. On the other hand, when the value dΦ / dz of conditional expression (2) is below the upper limit, the diameter of the light-shielding diaphragm II between the fourth and fifth lenses is larger than the diameter of the light-shielding diaphragm I between the third and fourth lenses. Therefore, the flange portion of the fifth lens can be sufficiently shielded, and stray light caused by the incidence of light rays on the flange portion of the fifth lens can be prevented.
The value dΦ / dz is more preferably in the range of the following formula.
0.90 <dΦ / dz <2.0 (2 ′)

In another aspect of the present invention, conditional expression (3)
0.03 <et6 / f <0.10 (3)
et6: Distance in the optical axis direction between the effective diameter position of the third lens image side surface and the effective diameter position of the object side surface of the fourth lens f: The focal length of the entire imaging lens system is satisfied.

When the value et6 / f of the conditional expression (3) exceeds the lower limit, it is possible to secure an interval for putting the light-shielding stop I around the third lens and the fourth lens. On the other hand, when the value et6 / f falls below the upper limit of the conditional expression (3), it is possible to prevent the height from being hindered by the interval being too wide.
The value et6 / f is more preferably in the range of the following formula.
0.05 <et6 / f <0.08 (3 ′)

In still another aspect of the present invention, conditional expression (4)
40 <θS7 <80 (4)
However,
θS7: Maximum surface angle (°) at 70% or more of the effective diameter of the object side surface of the fourth lens
Meet.

When the value θS7 of the conditional expression (4) exceeds the lower limit, the refraction angle can be kept small by setting the surface angle close to perpendicular to the light beam refracted by the third lens and having a large angle with respect to the optical axis. Therefore, the occurrence of coma and the like can be suppressed. On the other hand, when the value θS7 is less than the upper limit of the conditional expression (4), it is possible to prevent the formability from being impaired by the surface angle becoming too large.
The value θS7 is more preferably in the range of the following equation.
50 <θS7 <75 (4 ′)

In still another aspect of the present invention, conditional expression (5)
| Sag6 | / f <0.10 (5)
However,
| Sag6 |: Maximum sag amount on the image side surface of the third lens f: Satisfies the focal length of the entire imaging lens system.

By setting the value | Sag6 | / f so as to satisfy the range of the conditional expression (5), the sag amount on the image side surface of the third lens is reduced. Therefore, the region in the optical axis direction occupied by the third lens in the entire lens length Can be reduced, which is advantageous in reducing the height.
The value | Sag6 | / f is more preferably in the range of the following equation.
| Sag6 | / f <0.05 (5 ')

In still another aspect of the present invention, conditional expression (6)
−15 <θS6 <15 (6)
However,
θS6: Maximum surface angle (°) at 90% or more of the effective diameter of the image side surface of the third lens
Meet.

By setting the value θS6 so as to satisfy the range of the conditional expression (6), it is possible to refract the peripheral rays of the light bundle formed at the peripheral image height so as to diverge. It becomes easy to have a large angle, which is advantageous for reducing the height.
The value θS6 is more preferably in the range of the following equation.
−10 <θS6 <10 (6 ′)

In still another aspect of the present invention, conditional expression (7)
0.65 <Sag7 / d7 <1.50 (7)
However,
Sag7: Maximum sag amount on the object side surface of the fourth lens d7: Satisfies the center thickness of the fourth lens.

When the value Sag7 / d7 of the conditional expression (7) exceeds the lower limit, the area in the optical axis direction occupied by the object side surface of the fourth lens in the imaging lens increases, and therefore the degree of freedom of shape of the object side surface of the fourth lens is increased. It becomes large and can take a shape in which aberration does not easily occur with respect to the light beam after passing through the third lens. On the other hand, when the value Sag7 / d7 is less than the upper limit of the conditional expression (7), the amount of sag on the object side surface of the fourth lens does not become too large, which is effective in reducing the height.
The value Sag7 / d7 is more preferably in the range of the following formula.
0.75 <Sag7 / d7 <1.30 (7 ′)

In still another aspect of the present invention, conditional expression (8)
0.45 <θr6 / θr4 <1.00 (8)
However,
θr4: Refraction angle of the peripheral ray on the side farther from the optical axis of the diagonal image high light flux on the image side surface of the second lens θr6: Refraction angle on the side far from the optical axis of the diagonal image high light flux on the image side surface of the third lens Satisfies the refraction angle.

Since the value θr6 / θr4 in conditional expression (8) exceeds the lower limit, the image side surface of the second lens and the image side surface of the third lens can share the jumping up of the light beam, so that the occurrence of aberration is reduced. Can be suppressed. On the other hand, when the value θr6 / θr4 of the conditional expression (8) is below the upper limit, it is possible to prevent the occurrence of aberration due to excessively strong jumping of the light beam by the third lens.
The value θr6 / θr4 is more preferably in the range of the following equation.
0.50 <θr6 / θr4 <0.90 (8 ′)

In still another aspect of the present invention, conditional expression (9)
0.05 <et8 / f <0.20 (9)
However,
et8: Distance in the optical axis direction between the effective diameter position of the fourth lens image side surface and the effective diameter position of the object side surface of the fifth lens f: The focal length of the entire imaging lens system is satisfied.

When the value et8 / f of the conditional expression (9) exceeds the lower limit, a gap for inserting the light-shielding stop II can be secured between the fourth lens and the fifth lens, and the value et8 / f of the conditional expression (9) is the upper limit. If the distance is less than the range, it is possible to prevent the distance between the fourth lens and the fifth lens from becoming too large and hindering a reduction in height.
The value et8 / f is more preferably in the range of the following formula.
0.07 <et8 / f <0.15 (9 ′)

In still another aspect of the invention, the fifth lens is a negative lens, and the conditional expression (10)
45 <v5 <70 (10)
However,
v5: Satisfies the Abbe number of the fifth lens.

By making the fifth lens a negative lens, it is possible to secure a certain amount of back focus while reducing the height, so that the influence of dust or scratches on the lens can be reduced. In addition, since the inflection point is present on the image side surface of the fifth lens, its peripheral portion has a positive power, but the Abbe number v5 of the fifth lens is set to exceed the lower limit of the conditional expression (10). As a result, chromatic aberration occurring in the periphery of the fifth lens can be suppressed, so that lateral chromatic aberration can be reduced, and high performance can be achieved. On the other hand, since the Abbe number v5 in the conditional expression (10) is less than the upper limit, since it is a negative lens, the occurrence of longitudinal chromatic aberration can also be suppressed.
The value v5 is more preferably in the range of the following equation.
50 <v5 <60 (10 ′)

In still another aspect of the present invention, conditional expression (11)
1.45 <n1 <1.65 (11)
However,
n1: satisfies the refractive index of the first lens.

When the height is lowered, the principal point position of the entire system is moved toward the object side, so that the radius of curvature of the convex surface of the object side surface of the first lens becomes smaller. Therefore, the light incident on the periphery of the entrance pupil has a large spherical aberration. In particular, when the aperture is increased, the spherical aberration is remarkably increased, which hinders high performance. Therefore, by setting the refractive index n1 of the first lens to exceed the lower limit of the conditional expression (11), the same focal length can be obtained even if the surface angle is relaxed. Therefore, a large spherical surface with a strong convex surface on the object side. Occurrence of aberration can be prevented. Conversely, when the refractive index of the first lens is increased, the distance between the front principal point and the rear principal point of the first lens is increased, and the rear principal point related to the focal length is shifted to the image side. The focal length becomes shorter and the angle becomes wider. Since the rear principal point of the first lens is brought closer to the object side, if the first lens itself is brought closer to the object side, the total optical length becomes larger, which is disadvantageous for lowering the height. By strengthening the convex surface on the object side and bringing it closer to the meniscus shape, the rear principal point can be brought closer to the object side while maintaining the optical total length, but this causes a larger spherical aberration. Therefore, by making the refractive index n1 of the first lens lower than the upper limit of the conditional expression (11), the convex surface on the object side does not become too strong while reducing the height, and spherical aberration generated in the first lens. Can be kept small.
The value n1 is more preferably in the range of the following formula.
1.50 <n1 <1.60 (11 ′)

  In still another aspect of the present invention, the second lens is a negative lens. In this way, by making the second lens a negative lens, chromatic aberration and spherical aberration occurring in the first lens are corrected by the second lens having a high ray height, so that it can be effectively corrected. It becomes advantageous for performance improvement.

  In yet another aspect of the present invention, the second lens has a smaller absolute value of the curvature radius of the image side surface than the absolute value of the curvature radius of the object side surface. The light incident angle on the object side surface of the second lens can be kept small, the spherical aberration can be corrected appropriately, and high performance can be maintained.

  In still another aspect of the present invention, the image side surface of the second lens has a negative power partly or entirely of 70% or more of the effective diameter. As described above, a part or the whole of 70% or more of the effective diameter of the image side surface of the second lens has a negative power so that the peripheral ray of the light bundle formed at the peripheral image height is diverged. Since it becomes easy to refract, it is advantageous for low profile and lateral chromatic aberration correction.

In still another aspect of the present invention, conditional expression (12)
15 <v2 <30 (12)
However,
v2: satisfies the Abbe number of the second lens.

When the Abbe number v2 of the second lens is less than the upper limit of the conditional expression (12), the longitudinal chromatic aberration and the lateral chromatic aberration generated in the first lens can be corrected. On the other hand, when the Abbe number v2 exceeds the lower limit of the conditional expression (12), excessive correction of chromatic aberration can be prevented.
The value v2 is more preferably in the range of the following formula.
20 <v2 <25 (12 ′)

In still another aspect of the present invention, conditional expression (13)
-0.2 <f / f4 <2.0 (13)
However,
f4: Focal length of the fourth lens f: Satisfies the focal length of the entire imaging lens system.

  Since the value f / f4 related to the focal length of the fourth lens is below the upper limit of the conditional expression (13), the positive power of the fourth lens becomes too strong, which shortens the focal length of the entire system. The widening of the angle can be prevented. Further, when the value f / f4 related to the focal length of the fourth lens exceeds the lower limit of the conditional expression (13), the fourth lens has a strong negative power, and the focal length of the entire system becomes long and telephoto. Can be prevented.

In still another aspect of the present invention, conditional expression (14)
1.1 <f123 / f <1.7 (14)
However,
f123: Composite focal length from the first lens to the third lens f: Satisfies the focal length of the entire imaging lens system.

  By setting the value f123 / f related to the combined focal length of the first lens to the third lens within the range of the conditional expression (14), the positive power from the first lens to the third lens can be appropriately achieved. It is possible to reduce the optical total length while preventing the occurrence of aberrations due to the excessively strong intensity.

  In still another aspect of the present invention, the lens further includes a lens having substantially no power.

  In order to achieve the above object, 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, it is possible to obtain a small imaging device with little stray light and various aberrations corrected satisfactorily.

  In order to achieve the above object, a mobile terminal according to the present invention includes the above-described imaging device.

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 light-shielding stop. 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. It is a figure explaining the object side surface of a 4th lens concretely. 3 is a cross-sectional view of the 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. FIG. 10 is a cross-sectional view of the imaging lens of Example 5. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 5. FIGS. FIG. 10 is a cross-sectional view of the imaging lens of Example 6. (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.

  Hereinafter, with reference to FIG. 1 etc., the imaging lens which is one Embodiment of this invention is demonstrated. The imaging lens 10 illustrated in FIG. 1 has the same configuration as the imaging lens 15 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, an aperture stop AS, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The imaging lens 10 is small in size, and as a scale, it aims at miniaturization at a level satisfying the following expression (15).
L / 2Y <0.90 (15)
Here, L is the distance on the optical axis AX from the most object-side lens 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 imaging device 51 (the rectangular effective of the imaging device 51). Diagonal length of the pixel region), and the image-side focal point refers to an image point when parallel light rays parallel to the optical axis AX are incident on the imaging lens 10. By satisfying this range, the entire camera module 50 can be reduced in size and weight.

When a parallel 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 lens surface S52 of the image pickup lens 10 and the image side focal position. , The value of L is calculated after the parallel plate F portion is defined as an air conversion distance. More preferably, it is in the range of the following formula.
L / 2Y <0.78 (15 ′)

  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 L5 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 along the optical axis AX.

  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 fifth lenses L1 to L5 constituting the imaging lens 10 each have a supporting flange portion 39, 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 L5, the first to fourth light shielding stops FS1 to FS4 are arranged sandwiched by the flange portion 39 to prevent the generation of stray light. The first to fourth light shielding stops FS1 to FS4 are formed of, for example, a metal thin plate. An aperture stop AS that covers the periphery of the effective diameter of the lens L1 is formed on the object side of the lens barrel portion 54a.

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

  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 310 is communicably connected to the control unit 103 of 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 first and second driving mechanisms 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 a specific lens in the imaging lens 10 along the optical axis AX, thereby causing the imaging lens 10 to perform a focusing operation.

  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 drive unit 107 controls the image sensor 51 by scanning and driving based on the timing signal. Further, the image sensor driving unit 107 converts the detection signal output from the image sensor 51 or an analog signal as a photoelectric conversion signal into digital image data. Further, the image sensor driving unit 107 can perform various image processing such as distortion correction, color correction, and compression on the image signal detected 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 outputs an analog signal for 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, and a digital luminance signal Y and color difference signals Cb, Cr (image data) are generated and stored in the image memory 108. The stored digital data is periodically read out from the image memory 108 to generate a video signal thereof, 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 compressed by the image sensor driving unit 107. The compressed image data is recorded in the RAM 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 imaging device 51, and is a positive first lens with a convex surface facing the object side in order from the object side. L1, a negative second lens L2 near the optical axis AX, a third lens L3, a fourth lens L4, and a negative fifth lens L5 having a concave surface facing the image side. In the imaging lens 10, the image side surface S52 of the fifth lens L5 is aspheric and has an inflection point P within the effective diameter. In the second lens L2, the absolute value of the curvature radius of the image side surface S22 is smaller than the absolute value of the curvature radius of the object side surface S21. The image side surface S22 of the second lens L2 is inclined toward the image side at the effective diameter position at the upper end. The image side surface S32 of the third lens L3 has an aspherical shape, has an inflection point P, and is inclined toward the image side at the effective diameter position of the upper end. The object side surface S41 of the fourth lens L4 has an aspheric shape. The imaging lens 10 has an aperture stop AS on the object side of the third lens L3, and the aperture stop AS is disposed on the object side of the first lens L1 in the illustrated example. The imaging lens 10 has a third light shielding stop FS3 between the third lens L3 and the fourth lens L4, and has a fourth light shielding stop FS4 between the fourth lens L4 and the fifth lens L5. In the example, the first light-shielding stop FS1 is provided between the first lens L1 and the second lens L2, and the second light-shielding stop FS2 is provided between the second lens L2 and the third lens L3. In the present embodiment, the second lens L2 is a negative lens, but the third lens L3 may be a negative lens, or both the second and third lenses L2 and L3 may be negative lenses. In any case, a part or all of 70% or more of the effective diameter of the third lens L3 has negative power.

According to the imaging lens 10, the object side surface S11 of the first lens L1 is convex, which is advantageous for shortening the optical total length. Further, by arranging a negative lens in the second lens L2, the effect of correcting chromatic aberration can be enhanced. Furthermore, by making the image side surface S52 of the fifth lens L5 concave, it becomes easy to secure a desired back focus necessary for arranging the AF mechanism and the like. Further, by making the image side surface S52 of the fifth lens L5 an aspherical surface having the inflection point P within the effective diameter, the incident angle when the light beam LA having the peripheral image height is incident on the image plane can be suppressed to be small. In addition, the light receiving efficiency on the imaging surface I when the imaging element 51 is used can be improved. By arranging the aperture stop AS on the object side of the third lens L3 (more preferably on the object side of the second lens L2), the exit pupil can be moved away from the image plane. Can be kept small.
Further, in the imaging lens 10, stray light is avoided by arranging the light-shielding stops FS3 and FS4 between the third and fourth lenses L3 and L4 and between the fourth and fifth lenses L4 and L5. Further, when the image side surface S32 of the third lens L3 is tilted to the image side at the effective diameter position intersecting the dotted line, the peripheral ray of the light bundle formed at the maximum image height jumps up at the image side surface S32 of the third lens L3. Therefore, it becomes easy to give the light beam after passing through the third lens L3 a large angle with respect to the optical axis AX, which is advantageous in reducing the height.

The imaging lens 10 of the present embodiment has the conditional expression (1) described above in addition to the characteristics of the image side surface of the third lens.
0.015 <AS7 / f <0.07 (1)
Satisfied. However, the value AS7 is the maximum deviation amount between the aspherical shape of the object side surface S41 of the fourth lens L4 and the spherical shape SP (see FIG. 5) connecting the effective diameter position and the center point of the object side surface S41 of the fourth lens L4. mm), and the value f is the focal length of the entire imaging lens 10 system.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (1 ′).
0.02 <AS7 / f <0.05 (1 ′)

The imaging lens 10 of the present embodiment has the conditional expression (2) already described in addition to the characteristics of the image side surface of the third lens.
0.75 <dΦ / dz <2.5 (2)
Satisfied. However, the value dΦ is the diameter (inner diameter) of the fourth light shielding stop FS4 between the fourth and fifth lenses L4, L5 and the diameter (inner diameter) of the third light shielding stop FS3 between the third and fourth lenses L3, L4. The value dz is the distance between the fourth light-shielding stop FS4 between the fourth and fifth lenses L4 and L5 and the third light-shielding stop FS3 between the third and fourth lenses L3 and L4.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (2 ′).
0.90 <dΦ / dz <2.0 (2 ′)

The imaging lens 10 of the present embodiment has the conditional expression (3) already described in addition to the characteristics of the image side surface of the third lens.
0.03 <et6 / f <0.10 (3)
Satisfied. However, the value et6 is the distance in the optical axis AX direction between the effective diameter position of the image side surface S32 of the third lens L3 and the effective diameter position of the object side surface S41 of the fourth lens L4.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (3 ′).
0.05 <et6 / f <0.08 (3 ′)

The imaging lens 10 of the present embodiment has the conditional expression (4) already described in addition to the characteristics of the image side surface of the third lens.
40 <θS7 <80 (4)
Satisfied. However, the value θS7 is the maximum surface angle (°) at 70% or more of the effective diameter of the object side surface S41 of the fourth lens L4.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (4 ′).
50 <θS7 <75 (4 ′)

  Here, when an antireflection film is applied to the optical surface of a lens by a vacuum vapor deposition method, it is generally known that a thin film is formed at a location where the surface angle is large. When the film thickness is reduced, the transmittance wavelength characteristic shifts to the short wavelength side as compared with the case of the designed film thickness, so that the reflectance of light on the long wavelength side of the wavelength band aiming at the antireflection effect increases. . Therefore, if the surface angle at the effective diameter of the object side surface S41 of the fourth lens L4 is large so as to satisfy the conditional expression (4), the above phenomenon occurs and the transmittance wavelength characteristic aimed at the periphery of the lens cannot be obtained. Therefore, only the antireflection film on the object side surface S41 of the fourth lens L4 may be designed differently from the antireflection film on the other optical surfaces of the imaging lens 10. For example, the antireflection film on the object side surface S41 of the fourth lens L4 has a reflectance of 1.5% or less in the wavelength band of 420 to 750 nm when the angle θ formed with the optical axis AX is 0 degrees. Thus, the thickness is set, and the antireflection film of the other optical surface is 1% or less in the wavelength band of 420 to 650 nm in the incident light when the angle θ formed with the optical axis AX is 0 degree. Design as follows.

The imaging lens 10 of the present embodiment has the conditional expression (5) already described in addition to the characteristics of the image side surface of the third lens.
| Sag6 | / f <0.10 (5)
Satisfied. However, the value | Sag6 | is the maximum sag amount of the image side surface S32 of the third lens L3.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (5 ′).
| Sag6 | / f <0.05 (5 ')

The imaging lens 10 of the present embodiment has the conditional expression (6) described above in addition to the characteristics of the image side surface of the third lens.
−15 <θS6 <15 (6)
Satisfied. However, the value θS6 is the maximum surface angle (°) at 90% or more of the effective diameter of the image side surface S32 of the third lens L3.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (6 ′).
−10 <θS6 <10 (6 ′)

The imaging lens 10 of the present embodiment has the conditional expression (7) already described in addition to the characteristics of the image side surface of the third lens.
0.65 <Sag7 / d7 <1.50 (7)
Satisfied. However, the value Sag7 is the maximum sag amount of the object side surface S41 of the fourth lens L4, and the value d7 is the center thickness of the fourth lens L4.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (7 ′).
0.75 <Sag7 / d7 <1.30 (7 ′)

The imaging lens 10 of the present embodiment has the conditional expression (8) already described in addition to the characteristics of the image side surface of the third lens.
0.45 <θr6 / θr4 <1.00 (8)
Satisfied. However, the value θr4 is the refraction angle of the peripheral ray LA2 farther from the optical axis AX of the diagonal image high light beam at the image side surface S22 of the second lens L2, and the value θr6 is at the image side surface S32 of the third lens L3. This is the refraction angle of the peripheral ray LA2 on the side farther from the optical axis AX of the diagonal image high luminous flux.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (8 ′).
0.50 <θr6 / θr4 <0.90 (8 ′)

The imaging lens 10 of the present embodiment has the conditional expression (9) already described in addition to the characteristics of the image side surface of the third lens.
0.05 <et8 / f <0.20 (9)
Satisfied. However, the value et8 is the distance in the optical axis AX direction between the effective diameter position of the image side surface S42 of the fourth lens L4 and the effective diameter position of the object side surface S51 of the fifth lens L5.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (9 ′).
0.07 <et8 / f <0.15 (9 ′)

The imaging lens 10 of the present embodiment has the conditional expression (10) described above in addition to the characteristics of the image side surface of the third lens.
45 <v5 <70 (10)
Satisfied. However, the value v5 is the Abbe number of the fifth lens L5.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (10 ′).
50 <v5 <60 (10 ′)

The imaging lens 10 of the present embodiment has the conditional expression (11) already described in addition to the characteristics of the image side surface of the third lens.
1.45 <n1 <1.65 (11)
Satisfied. However, the value n1 is the refractive index of the first lens L1.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (11 ′).
1.50 <n1 <1.60 (11 ′)

The imaging lens 10 of the present embodiment has the conditional expression (12) already described in addition to the characteristics of the image side surface of the third lens.
15 <v2 <30 (12)
Satisfied. However, the value v2 is the Abbe number of the second lens L2.
Note that the imaging lens 10 of the present embodiment more preferably satisfies the following conditional expression (12 ′).
20 <v2 <25 (12 ′)

The imaging lens 10 of the present embodiment has the conditional expression (13) described above in addition to the characteristics of the image side surface of the third lens.
-0.2 <f / f4 <2.0 (13)
Satisfied. However, the value f4 is the focal length of the fourth lens L4.

The imaging lens 10 of the present embodiment has the conditional expression (14) already described in addition to the characteristics of the image side surface of the third lens.
1.1 <f123 / f <1.7 (14)
Satisfied. However, the value f123 is the combined focal length from the first lens L1 to the third lens L3.

  In the imaging lens 10 of the present embodiment, although not particularly illustrated, a lens having substantially no power can be further provided.

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ＦＳ１〜ＦＳ４を意味する。「ＯＢＪ」は物体面であり、「ＩＭＧ」は撮像面又は像面である。
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。 〔Example〕
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-shielding stops FS1 to FS4. “OBJ” is an object plane, and “IMG” is an imaging plane or an image plane.
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.
OBJ INFINITY 1e + 020
STO INFINITY 0.0471 1.304
2 INFINITY -0.2200 1.304
3 * 1.0985 0.3720 1.54470 56.15 1.326
4 * 69.6947 0.0470 1.325
5 FS INFINITY 0.0000 1.324
6 * 4.8325 0.1410 1.64200 21.99 1.321
7 * 1.5004 0.2200 1.319
8 FS INFINITY 0.0840 1.424
9 * 34.0952 0.3780 1.54470 56.15 1.533
10 * -20.4924 -0.0300 1.765
11 FS INFINITY 0.3980 2.040
12 * -14.0939 0.3960 1.54470 56.15 2.223
13 * -0.8148 -0.3300 2.662
14 FS INFINITY 0.5280 3.200
15 * -4.9217 0.2370 1.54470 56.15 3.659
16 * 0.8510 0.3800 3.742
17 INFINITY 0.1100 1.51633 64.14 4.288
18 INFINITY 0.2950 4.344
IMG INFINITY 0.0000

The aspheric coefficients of the lens surfaces of Example 1 are shown in Table 2 below.
[Table 2]
Third side
K = 7.84081e-002, A4 = 9.93435e-003, A6 = 5.02035e-002, A8 = -1.94121e-002,
A10 = 2.45608e-001, A12 = 3.53437e-001, A14 = -1.31664e + 000
4th page
K = -8.00000e + 001, A4 = 7.85845e-002, A6 = 2.06196e-001, A8 = 4.53534e-002,
A10 = -1.38523e + 000, A12 = -1.49706e + 000, A14 = 3.20190e + 000
6th page
K = -1.53489e + 001, A4 = -7.82755e-002, A6 = 7.62915e-001, A8 = -9.32301e-001,
A10 = -2.11519e + 000, A12 = -4.62527e-001, A14 = 5.13072e + 000
7th page
K = -9.25340e + 000, A3 = -9.17026e-003, A4 = 2.41073e-001, A5 = -2.55538e-003,
A6 = 3.25291e-001, A8 = -1.95887e-001, A10 = -5.22547e-001, A12 = -1.44253e + 000,
A14 = 6.01197e + 000
9th page
K = 7.96983e + 001, A3 = 2.20811e-002, A4 = -3.47438e-001, A5 = 6.77792e-003,
A6 = 3.36281e-001, A8 = -6.74153e-001, A10 = 6.01068e-002, A12 = 3.07337e + 000,
A14 = -2.20975e + 000
10th page
K = 0.00000e + 000, A3 = -2.08223e-002, A4 = -2.00238e-001, A5 = -4.57015e-003,
A6 = -1.47530e-001, A8 = 7.91072e-002, A10 = 1.57376e-001, A12 = -4.74293e-001,
A14 = 7.31079e-001
12th page
K = 6.56470e + 001, A3 = 5.38590e-002, A4 = -2.78523e-001, A5 = 2.38887e-001,
A6 = 4.62587e-002, A8 = -3.31257e-001, A10 = 2.03204e-001, A12 = -1.31271e-001,
A14 = 5.80562e-002
Side 13
K = -6.13979e + 000, A3 = -9.78081e-002, A4 = -2.61925e-001, A5 = 2.29911e-001,
A6 = 3.46688e-001, A8 = -2.90986e-001, A10 = -3.60164e-002, A12 = 1.04591e-001,
A14 = -3.00530e-002
15th page
K = -2.13485e + 000, A3 = -3.35603e-001, A4 = 1.07428e-001, A5 = 5.73446e-002,
A6 = 3.17956e-002, A8 = -1.41488e-002, A10 = -2.24613e-003, A12 = 1.25247e-003,
A14 = -1.13676e-004
16th page
K = -8.28042e + 000, A3 = -1.88368e-001, A4 = 1.28782e-002, A5 = 3.66406e-002,
A6 = -2.03155e-003, A8 = -1.19453e-002, A10 = 2.47955e-003, A12 = -3.84405e-004,
A14 = 9.81768e-005
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 2.719
Fno 1.96
w 80.42
Ymax 2.295
BF 0.624
TL 3.189
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 half value of the diagonal length of the imaging surface of the imaging device, and BF means This means back focus, and TL means the total length of the system. 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]
Elem Surfs Focal Length Diameter
1 3- 4 2.0451 1.326
2 6- 7 -3.4465 1.321
3 9-10 23.5557 1.765
4 12-13 1.5711 2.662
5 15-16 -1.3130 3.742

  FIG. 6 is a cross-sectional view of the imaging lens 15 and the like of the first embodiment. The imaging lens 15 includes, in order from the object side, a first meniscus lens L1 having a positive refractive power around the optical axis AX and having 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 biconvex third lens L3 having a weak positive refractive power around the optical axis AX, and a positive refractive power around the optical axis AX. And a meniscus fourth lens L4 having a convex surface facing the image side, and a biconcave fifth lens L5 having negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  7A to 7C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 15 of Example 1, and FIG. 7D and FIG. 3 shows meridional coma aberration of the imaging lens 15 of Example 1. FIG.

[Example 2]
The lens surface data of Example 2 is shown in Table 4 below.
[Table 4]
Surface number rd nd vd eff.dia.
OBJ INFINITY 1e + 020
1 INFINITY 0.0000 1.200
STO INFINITY -0.1800 1.200
3 * 0.9815 0.3330 1.54470 55.99 1.201
4 * 4.9212 0.0610 1.114
5 FS INFINITY 0.0000 1.088
6 * 2.3711 0.1500 1.64000 22.99 1.101
7 * 1.2489 0.1710 1.135
8 FS INFINITY 0.0300 1.254
9 * 6.9716 0.2450 1.54470 55.99 1.298
10 * -16.8430 0.0300 1.390
11 FS INFINITY 0.4570 1.502
12 * -2.9160 0.4500 1.64000 22.99 1.653
13 * -2.9933 -0.3000 2.386
14 FS INFINITY 0.3500 2.978
15 * 1.4752 0.4850 1.54470 55.99 3.712
16 * 0.9635 0.3790 3.940
17 INFINITY 0.1100 1.51600 64.09 4.298
18 INFINITY 0.3500 4.348
IMG INFINITY 0.0000

The aspherical coefficient of the lens surface of Example 2 is shown in Table 5 below.
[Table 5]
Third side
K = 5.21930e-002, A4 = -3.12446e-002, A6 = 3.77245e-001, A8 = -1.28331e + 000,
A10 = 2.29492e + 000, A12 = 4.34645e-001, A14 = -1.40784e + 000
4th page
K = -8.00000e + 001, A4 = -3.03041e-001, A6 = 1.82539e + 000, A8 = -3.14746e + 000,
A10 = 7.18971e-002, A12 = 8.20605e + 000, A14 = -1.02407e + 001
6th page
K = -8.00000e + 001, A4 = -2.81974e-001, A6 = 1.72586e + 000, A8 = -1.44494e + 000,
A10 = -7.64125e + 000, A12 = 1.77489e + 001, A14 = -1.73755e + 001
7th page
K = -1.07676e + 001, A4 = 3.25628e-002, A6 = 1.61839e + 000, A8 = -2.74931e + 000,
A10 = 6.41592e + 000, A12 = -2.12222e + 001, A14 = 3.13853e + 001
9th page
K = 3.72358e + 000, A4 = -3.29222e-001, A6 = 1.23503e-001, A8 = 1.80994e + 000,
A10 = -3.86685e + 000, A12 = 6.22366e-001, A14 = 3.83345e + 001, A16 = -5.53900e + 001
10th page
K = 8.00000e + 001, A4 = -1.67761e-001, A6 = -7.37376e-001, A8 = 3.11210e + 000,
A10 = -5.00410e + 000, A12 = 1.86447e + 000, A14 = 7.63368e + 000
12th page
K = -1.70918e + 001, A4 = 1.44682e-001, A6 = -1.68005e + 000, A8 = 5.69642e + 000,
A10 = -1.87443e + 001, A12 = 3.58991e + 001, A14 = -3.83571e + 001, A16 = 1.57268e + 001
Side 13
K = 1.83911e + 000, A4 = -3.31564e-001, A6 = 1.92382e + 000, A8 = -5.69702e + 000,
A10 = 8.90891e + 000, A12 = -8.02703e + 000, A14 = 3.87798e + 000, A16 = -7.71205e-001
15th page
K = -3.97848e + 001, A4 = -3.59014e-001, A6 = 2.64856e-001, A8 = -7.17287e-002,
A10 = 1.04882e-003, A12 = 3.70112e-003, A14 = -7.69582e-004, A16 = 5.03311e-005
16th page
K = -7.28644e + 000, A4 = -2.23101e-001, A6 = 1.18034e-001, A8 = -3.67353e-002,
A10 = 5.12364e-003, A12 = 1.18093e-004, A14 = -6.68772e-005

The characteristics of the imaging lens of Example 2 are listed below.
FL 2.845
Fno 2.46
w 75.00
Ymax 2.299
BF 0.663
TL 3.264

The single lens data of Example 2 is shown in Table 6 below.
[Table 6]
Elem Surfs Focal Length Diameter
1 3- 4 2.1856 1.201
2 6- 7 -4.3499 1.135
3 9-10 9.0851 1.390
4 12-13 138.7077 2.386
5 15-16 -7.6599 3.940

  FIG. 8 is a cross-sectional view of the imaging lens 17 and the like of the second embodiment. The imaging lens 17 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a negative refractive power around the optical axis AX. A second meniscus lens L2 having a convex surface facing the side, a biconvex third lens L3 having a positive refractive power around the optical axis AX, and a weak positive refractive power around the optical axis AX, on the image side A fourth meniscus lens L4 having a convex surface and a fifth meniscus lens L5 having a negative refractive power around the optical axis AX and having a convex surface facing the object side. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  9A to 9C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 17 of Example 2, and FIGS. 9D and 9E show the examples. The meridional coma aberration of the imaging lens 17 of Example 2 is shown.

Example 3
The lens surface data of Example 3 is shown in Table 7 below.
[Table 7]
Surface number rd nd vd eff.dia.
OBJ INFINITY 1e + 020
1 INFINITY 0.0500 1.390
STO INFINITY -0.2193 1.390
3 * 1.1800 0.4200 1.56300 57.51 1.469
4 * 42.7721 0.0450 1.457
5 FS INFINITY 0.0050 1.460
6 * 7.8610 0.1500 1.63469 23.86 1.436
7 * 1.7182 0.2330 1.426
8 FS INFINITY 0.0800 1.522
9 * 14.4840 0.3440 1.54470 56.15 1.601
10 * -50.6611 -0.0200 1.805
11 FS INFINITY 0.4150 2.110
12 * -8.4724 0.4430 1.54470 56.15 2.208
13 * -0.8793 -0.3500 2.571
14 FS INFINITY 0.5730 3.350
15 * -7.8062 0.2500 1.54470 56.15 3.225
16 * 0.9205 0.4030 3.653
17 INFINITY 0.1100 1.51633 64.14 4.214
18 INFINITY 0.3170 4.270
IMG INFINITY 0.0000

The aspherical coefficients of the lens surfaces of Example 3 are shown in Table 8 below.
[Table 8]
Third side
K = 1.20295e-001, A4 = 6.16800e-003, A6 = 2.76128e-002, A8 = -3.96066e-002,
A10 = 1.84881e-001, A12 = 3.57419e-001, A14 = -8.81536e-001
4th page
K = -8.00000e + 001, A4 = 5.55389e-002, A6 = 1.80024e-001, A8 = 4.46350e-003,
A10 = -6.87161e-001, A12 = -8.75790e-001, A14 = 8.08143e-001
6th page
K = 1.32066e + 001, A4 = -4.95968e-002, A6 = 5.56985e-001, A8 = -6.42766e-001,
A10 = -1.16447e + 000, A12 = -4.63545e-001, A14 = 1.85764e + 000
7th page
K = -1.07421e + 001, A3 = -1.05703e-002, A4 = 2.39385e-001, A5 = -6.04010e-003,
A6 = 1.93047e-001, A8 = -8.57504e-002, A10 = -3.35227e-001, A12 = -1.03234e + 000,
A14 = 2.96635e + 000
9th page
K = -7.97371e + 001, A3 = 1.67912e-002, A4 = -2.77390e-001, A5 = 1.92700e-002,
A6 = 1.69485e-001, A8 = -3.02528e-001, A10 = 6.12083e-002, A12 = 1.37218e + 000,
A14 = -9.78111e-001
10th page
K = 0.00000e + 000, A3 = -5.63340e-003, A4 = -1.91253e-001, A5 = 1.64110e-003,
A6 = -6.40458e-002, A8 = -1.82102e-002, A10 = 8.73276e-002, A12 = -1.21725e-001,
A14 = 2.96975e-001
12th page
K = 2.29161e + 001, A3 = 3.99084e-002, A4 = -1.95641e-001, A5 = 1.86176e-001,
A6 = -1.76248e-002, A8 = -1.32199e-001, A10 = 1.87856e-002, A12 = -1.86391e-002,
A14 = 2.32222e-002
Side 13
K = -6.38388e + 000, A3 = -1.05440e-001, A4 = -2.20541e-001, A5 = 2.04086e-001,
A6 = 2.31088e-001, A8 = -2.05007e-001, A10 = -2.63676e-004, A12 = 4.99831e-002,
A14 = -1.46342e-002
15th page
K = -2.26757e + 001, A3 = -2.86183e-001, A4 = 5.81917e-002, A5 = 3.75230e-002,
A6 = 2.60152e-002, A8 = -5.73625e-003, A10 = -1.44745e-003, A12 = 3.59149e-004,
A14 = -8.91027e-006
16th page
K = -8.30202e + 000, A3 = -1.52265e-001, A4 = -1.20981e-003, A5 = 2.02348e-002,
A6 = 3.52404e-003, A8 = -7.10145e-003, A10 = 1.12607e-003, A12 = -1.67122e-004,
A14 = 4.35180e-005

The characteristics of the imaging lens of Example 3 are listed below.
FL 2.891
Fno 2.08
w 76.78
Ymax 2.293
BF 0.664
TL 3.381

The single lens data of Example 3 is shown in Table 9 below.
[Table 9]
Elem Surfs Focal Length Diameter
1 3- 4 2.1476 1.469
2 6- 7 -3.4975 1.436
3 9-10 20.7173 1.805
4 12-13 1.7648 2.571
5 15-16 -1.4965 3.653

  FIG. 10 is a cross-sectional view of the imaging lens 18 and the like of the third embodiment. The imaging lens 18 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and having 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 convexly biconvex third lens L3 having a weak positive refractive power around the optical axis AX, and a positive lens around the optical axis AX. A meniscus fourth lens L4 having a refractive power and having a convex surface facing the image side, and a biconcave fifth lens L5 having a negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  11A to 11C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 18 of Example 3, and FIGS. 11D and 11E show the examples. 6 shows meridional coma aberration of the imaging lens 18 of Example 3.

Example 4
The lens surface data of Example 4 is shown in Table 10 below.
[Table 10]
Surface number rd nd vd eff.dia.
OBJ INFINITY 1e + 020
1 INFINITY 0.0500 1.464
STO INFINITY -0.2435 1.464
3 * 1.2568 0.4040 1.54470 56.00 1.502
4 * 8.0180 0.0700 1.491
5 FS INFINITY 0.0190 1.504
6 * 6.6322 0.1500 1.63469 23.86 1.476
7 * 2.2303 0.2000 1.538
8 FS INFINITY 0.0520 1.614
9 * 9.8569 0.3470 1.54470 56.15 1.669
10 * -96.1813 0.0000 1.797
11 FS INFINITY 0.3350 2.000
12 * -18.8022 0.5390 1.54470 56.15 2.080
13 * -0.8532 -0.3000 2.499
14 FS INFINITY 0.5120 3.428
15 * -7.9875 0.2500 1.54470 56.15 3.108
16 * 0.8801 0.2500 3.675
17 INFINITY 0.1100 1.51633 64.14 4.073
18 INFINITY 0.4850 4.134
IMG INFINITY 0.0000

The aspheric coefficients of the lens surfaces of Example 4 are shown in Table 11 below.
[Table 11]
Third side
K = 2.02519e-001, A4 = -4.12703e-003, A6 = 3.50029e-002, A8 = -8.53752e-004,
A10 = 1.06591e-001, A12 = 1.88864e-001, A14 = -3.63334e-001
4th page
K = 1.07858e + 001, A4 = -2.23728e-002, A6 = 1.89132e-001, A8 = 1.21639e-001,
A10 = -4.51691e-001, A12 = -4.98517e-001, A14 = -1.60631e-001
6th page
K = -7.02254e + 001, A4 = -1.10347e-001, A6 = 5.60675e-001, A8 = -4.55026e-001,
A10 = -1.06523e + 000, A12 = -4.97676e-001, A14 = 7.89701e-001
7th page
K = -2.57603e + 001, A3 = -3.72850e-003, A4 = 1.91204e-001, A5 = -4.23794e-002,
A6 = 1.95713e-001, A8 = -8.32246e-002, A10 = -2.90752e-001, A12 = -1.01859e + 000,
A14 = 1.68623e + 000
9th page
K = -7.16430e + 001, A3 = 6.97586e-003, A4 = -2.61556e-001, A5 = 6.10427e-002,
A6 = 1.68379e-001, A8 = -4.23603e-001, A10 = 2.04512e-001, A12 = 1.97297e + 000,
A14 = -1.87145e + 000
10th page
K = 0.00000e + 000, A3 = -8.13216e-003, A4 = -1.85193e-001, A5 = -8.44559e-003,
A6 = -6.86785e-002, A8 = -2.90003e-003, A10 = 4.12544e-002, A12 = -1.91061e-001,
A14 = 4.72884e-001
12th page
K = 8.00000e + 001, A3 = 4.82563e-002, A4 = -2.25745e-001, A5 = 2.08621e-001,
A6 = -2.87079e-002, A8 = -1.89260e-001, A10 = 4.14664e-002, A12 = 1.97713e-002,
A14 = -2.49444e-002
Side 13
K = -6.28687e + 000, A3 = -9.87785e-002, A4 = -2.32143e-001, A5 = 1.90900e-001,
A6 = 2.30808e-001, A8 = -2.02504e-001, A10 = -2.96206e-003, A12 = 4.86242e-002,
A14 = -1.38078e-002
15th page
K = 5.09168e + 000, A3 = -3.00349e-001, A4 = 5.94822e-002, A5 = 3.98436e-002,
A6 = 2.72056e-002, A8 = -5.70579e-003, A10 = -1.45576e-003, A12 = 3.67231e-004,
A14 = -1.13945e-005
16th page
K = -8.02522e + 000, A3 = -1.48533e-001, A4 = 1.81488e-003, A5 = 2.19876e-002,
A6 = 2.72398e-003, A8 = -7.00641e-003, A10 = 1.27333e-003, A12 = -1.63098e-004,
A14 = 2.91955e-005

The characteristics of the imaging lens of Example 4 are listed below.
FL 2.723
Fno 1.86
w 80.28
Ymax 2.294
BF 0.664
TL 3.386

The single lens data of Example 4 is shown in Table 12 below.
[Table 12]
Elem Surfs Focal Length Diameter
1 3- 4 2.6798 1.502
2 6- 7 -5.3656 1.538
3 9-10 16.4328 1.797
4 12-13 1.6236 2.499
5 15-16 -1.4411 3.675

  FIG. 12 is a cross-sectional view of the imaging lens 23 and the like of the fourth embodiment. The imaging lens 23 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a negative refractive power around the optical axis AX. A second meniscus lens L2 having a convex surface facing the side, a third convex biconvex lens L3 having a weak positive refractive power around the optical axis AX, and a positive refractive power around the optical axis AX. And a meniscus fourth lens L4 having a convex surface facing the image side, and a biconcave fifth lens L5 having negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  13A to 13C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 23 of Example 4, and FIGS. 13D and 13E show the examples. 10 shows meridional coma aberration of the imaging lens 23 of Example 4.

Example 5
The lens surface data of Example 5 is shown in Table 13 below.
[Table 13]
Surface number rd nd vd eff.dia.
OBJ INFINITY 1e + 020
STO INFINITY 0.0000 1.436
2 INFINITY -0.2870 1.436
3 * 1.0070 0.4360 1.54470 55.99 1.437
4 * 4.4637 0.0450 1.327
5 FS INFINITY 0.0000 1.312
6 * 3.3464 0.1500 1.64000 23.29 1.278
7 * 1.8013 0.2020 1.130
8 FS INFINITY 0.1000 1.320
9 * -71.6959 0.2300 1.54470 55.99 1.313
10 * -26.1486 -0.0500 1.522
11 FS INFINITY 0.4250 1.690
12 * -3.4186 0.3230 1.64000 23.29 1.767
13 * -4.3498 -0.3200 2.382
14 FS INFINITY 0.3700 2.980
15 * 1.6158 0.6180 1.54470 55.99 3.640
16 * 1.2788 0.3630 3.870
17 INFINITY 0.1100 1.51633 64.14 4.333
18 INFINITY 0.3430 4.368
IMG INFINITY 0.0000

The aspheric coefficients of the lens surfaces of Example 5 are shown in Table 14 below.
[Table 14]
Third side
K = -6.57711e-002, A4 = 1.87744e-002, A6 = 8.89395e-002, A8 = -2.10715e-001,
A10 = 7.50299e-001, A12 = -1.29577e + 000, A14 = 1.24466e + 000
4th page
K = -7.99987e + 001, A4 = -3.69373e-001, A6 = 1.53873e + 000, A8 = -2.33959e + 000,
A10 = -5.87555e-001, A12 = 7.16396e + 000, A14 = -6.72109e + 000
6th page
K = -7.53568e + 001, A4 = -5.63195e-001, A6 = 2.21534e + 000, A8 = -2.11612e + 000,
A10 = -5.39776e + 000, A12 = 1.78352e + 001, A14 = -1.50203e + 001
7th page
K = -2.09163e + 001, A4 = 3.82920e-002, A6 = 8.07164e-001, A8 = -9.53705e-001,
A10 = 6.19105e + 000, A12 = -2.18787e + 001, A14 = 3.13844e + 001
9th page
K = -4.53393e + 000, A4 = -4.17160e-001, A6 = -2.24877e-001, A8 = 2.35151e + 000,
A10 = -7.93832e + 000, A12 = 4.80928e + 000, A14 = 3.83357e + 001, A16 = -5.53896e + 001
10th page
K = 7.75444e + 001, A4 = -2.85713e-001, A6 = -4.81983e-001, A8 = 1.66316e + 000,
A10 = -3.35328e + 000, A12 = 4.86831e + 000, A14 = -1.33944e + 000
12th page
K = -3.17714e + 001, A4 = 2.63823e-001, A6 = -1.69814e + 000, A8 = 5.64088e + 000,
A10 = -1.86920e + 001, A12 = 3.60010e + 001, A14 = -3.74695e + 001, A16 = 1.56625e + 001
Side 13
K = 4.80458e + 000, A4 = -3.46799e-001, A6 = 1.93223e + 000, A8 = -5.74051e + 000,
A10 = 8.90348e + 000, A12 = -7.99894e + 000, A14 = 3.88427e + 000, A16 = -7.78210e-001
15th page
K = -3.47047e + 001, A4 = -3.77991e-001, A6 = 2.65778e-001, A8 = -7.13874e-002,
A10 = 1.14099e-003, A12 = 3.68352e-003, A14 = -7.92031e-004, A16 = 5.50885e-005
16th page
K = -6.65888e + 000, A4 = -2.20019e-001, A6 = 1.09281e-001, A8 = -3.73100e-002,
A10 = 5.20772e-003, A12 = 1.05444e-004, A14 = -6.24856e-005

The characteristics of the imaging lens of Example 5 are listed below.
FL 2.945
Fno 2.05
w 75.00
Ymax 2.298
BF 0.665
TL 3.308

The single lens data of Example 5 is shown in Table 15 below.
[Table 15]
Elem Surfs Focal Length Diameter
1 3- 4 2.2856 1.437
2 6- 7 -6.3353 1.278
3 9-10 75.4312 1.522
4 12-13 -28.8606 2.382
5 15-16 -31.8629 3.870

  FIG. 14 is a cross-sectional view of the imaging lens 24 and the like according to the fifth embodiment. The imaging lens 24 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a negative refractive power around the optical axis AX. A second meniscus lens L2 having a convex surface facing the side, a third meniscus lens L3 having a weak positive refractive power around the optical axis AX and having a substantially flat shape and a slightly convex surface facing the object side, and an optical axis A fourth meniscus lens L4 having a weak negative refracting power around AX and having a convex surface facing the image side, and a fifth meniscus having a weak negative refracting power around the optical axis AX and having a convex surface facing the object side. And a lens L5. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  FIGS. 15A to 15C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 24 of Example 5, and FIGS. 15D and 15E show the examples. 10 shows meridional coma aberration of the imaging lens 24 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.
OBJ INFINITY 1e + 020
1 FS INFINITY 0.0500 1.304
2 INFINITY -0.2080 1.304
3 * 1.1249 0.3740 1.54470 55.99 1.304
4 * -36.1053 0.0330 1.219
STO INFINITY 0.0140 1.200
6 * 8.4757 0.1410 1.63469 23.86 1.211
7 * 1.6330 0.2380 1.263
8 FS INFINITY 0.0660 1.468
9 * 9.9552 0.3490 1.54470 56.15 1.488
10 * INFINITY -0.0190 1.731
11 FS INFINITY 0.4020 1.960
12 * -19.0041 0.3960 1.54470 56.15 2.184
13 * -0.8281 -0.2830 2.652
14 FS INFINITY 0.4760 3.400
15 * -4.1782 0.2520 1.54470 56.15 3.616
16 * 0.8800 0.3790 3.727
17 INFINITY 0.1100 1.51633 64.14 4.295
18 INFINITY 0.2950 4.351
IMG INFINITY 0.0000

Table 17 below shows the aspheric coefficients of the lens surfaces of Example 6.
[Table 17]
Third side
K = 8.40264e-002, A4 = 1.02321e-002, A6 = 5.03617e-002, A8 = -1.50596e-002,
A10 = 2.37600e-001, A12 = 3.52465e-001, A14 = -1.42856e + 000
4th page
K = -8.00000e + 001, A4 = 9.74015e-002, A6 = 2.00287e-001, A8 = -1.21203e-002,
A10 = -1.44040e + 000, A12 = -1.49800e + 000, A14 = 3.26565e + 000
6th page
K = -1.51570e + 001, A4 = -7.79693e-002, A6 = 7.46629e-001, A8 = -9.74241e-001,
A10 = -2.17276e + 000, A12 = -4.43062e-001, A14 = 5.61041e + 000
7th page
K = -1.07565e + 001, A3 = -1.85220e-002, A4 = 2.19991e-001, A5 = -2.69574e-002,
A6 = 3.01310e-001, A8 = -2.00645e-001, A10 = -5.24269e-001, A12 = -1.49950e + 000,
A14 = 5.67612e + 000
9th page
K = -2.46828e + 001, A3 = 2.00398e-002, A4 = -3.56055e-001, A5 = 5.29551e-003,
A6 = 3.33816e-001, A8 = -6.78811e-001, A10 = 4.37584e-002, A12 = 2.98366e + 000,
A14 = -2.44695e + 000
10th page
K = 0.00000e + 000, A3 = -2.58543e-002, A4 = -2.01044e-001, A5 = -1.47727e-002,
A6 = -1.48195e-001, A8 = 8.35685e-002, A10 = 1.56334e-001, A12 = -4.60494e-001,
A14 = 7.71746e-001
12th page
K = 7.89034e + 001, A3 = 4.44820e-002, A4 = -2.61281e-001, A5 = 2.27258e-001,
A6 = 5.68724e-002, A8 = -3.46559e-001, A10 = 1.88372e-001, A12 = -1.06288e-001,
A14 = 4.47185e-002
Side 13
K = -6.09314e + 000, A3 = -9.70957e-002, A4 = -2.64846e-001, A5 = 2.51452e-001,
A6 = 3.44712e-001, A8 = -3.07330e-001, A10 = -3.30800e-002, A12 = 1.08985e-001,
A14 = -3.16370e-002
15th page
K = -3.74130e + 000, A3 = -3.28773e-001, A4 = 1.08535e-001, A5 = 5.69349e-002,
A6 = 3.16204e-002, A8 = -1.41890e-002, A10 = -2.28439e-003, A12 = 1.24091e-003,
A14 = -1.08557e-004
16th page
K = -8.42520e + 000, A3 = -1.88142e-001, A4 = 1.53126e-002, A5 = 3.59111e-002,
A6 = -2.12707e-003, A8 = -1.20069e-002, A10 = 2.38451e-003, A12 = -3.95316e-004,
A14 = 1.06959e-004

The characteristics of the imaging lens of Example 6 are listed below.
FL 2.726
Fno 1.97
w 80.46
Ymax 2.295
BF 0.626
TL 3.186

The single lens data of Example 6 is shown in Table 18 below.
[Table 18]
Elem Surfs Focal Length Diameter
1 3- 4 2.0099 1.304
2 6- 7 -3.2127 1.263
3 9-10 18.2765 1.731
4 12-13 1.5774 2.652
5 15-16 -1.3114 3.727

  FIG. 16 is a cross-sectional view of the imaging lens 26 and the like of the sixth embodiment. The imaging lens 26 is, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX and close to a convex plane, and a negative refractive power around the optical axis AX toward the object side. A second meniscus lens L2 having a convex surface, a convex third lens L3 having a weak positive refractive power around the optical axis AX and a convex surface facing the object side, and a positive refractive power around the optical axis AX And a meniscus fourth lens L4 having a convex surface facing the image side, and a biconcave fifth lens L5 having negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed between the first lens L1 and the second lens L2. A light-shielding stop FS1 is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS2 to FS4 are disposed between the lenses L2 to L5. 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.

  17A to 17C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 26 of Example 6, and FIGS. 17D and 17E show the examples. 7 shows meridional coma aberration of the imaging lens 26 of Example 6.

Example 7
The lens surface data of Example 7 is shown in Table 19 below.
[Table 19]
Surface number rd nd vd eff.dia.
OBJ INFINITY 1e + 020
STO INFINITY 0.0500 1.304
2 INFINITY -0.2200 1.304
3 * 1.0857 0.3630 1.54470 56.00 1.305
4 * 8.1718 0.0570 1.216
5 FS INFINITY -0.0100 1.190
6 * 3.1098 0.1410 1.63469 23.86 1.201
7 * 1.4403 0.2540 1.237
8 FS INFINITY 0.0980 1.476
9 * 49.2357 0.3230 1.54470 56.15 1.598
10 * -12.9135 -0.0500 1.756
11 FS INFINITY 0.4280 2.080
12 * -7.7806 0.3590 1.54470 56.15 2.074
13 * -0.9314 -0.3300 2.502
14 FS INFINITY 0.6000 2.940
15 * -2.9973 0.2360 1.54470 56.15 3.323
16 * 1.1145 0.3630 3.638
17 INFINITY 0.1100 1.51633 64.14 4.292
18 INFINITY 0.2730 4.351
IMG INFINITY 0.0000

Table 20 below shows the aspheric coefficients of the lens surfaces of Example 7.
[Table 20]
Aspheric coefficient third surface
K = 1.73380e-001, A4 = 4.43256e-003, A6 = 3.72606e-002, A8 = -6.56219e-003,
A10 = 2.26339e-001, A12 = 3.38390e-001, A14 = -1.30834e + 000
4th page
K = -8.00000e + 001, A4 = 1.54234e-002, A6 = 2.84951e-001, A8 = -4.88615e-002,
A10 = -1.40133e + 000, A12 = -1.37798e + 000, A14 = 3.11248e + 000
6th page
K = -1.83748e + 001, A4 = -8.32558e-002, A6 = 6.85797e-001, A8 = -9.35273e-001,
A10 = -2.07282e + 000, A12 = -3.84205e-001, A14 = 5.00835e + 000
7th page
K = -8.44438e + 000, A3 = -9.20460e-003, A4 = 2.96508e-001, A5 = -1.26192e-002,
A6 = 2.41452e-001, A8 = -1.97538e-001, A10 = -3.90770e-001, A12 = -1.36346e + 000,
A14 = 5.94126e + 000
9th page
K = 8.00000e + 001, A3 = 3.02113e-002, A4 = -3.20664e-001, A5 = 5.43858e-002,
A6 = 2.44702e-001, A8 = -4.80922e-001, A10 = 5.25911e-002, A12 = 2.46165e + 000,
A14 = -2.03066e + 000
10th page
K = 0.00000e + 000, A3 = -6.46732e-003, A4 = -2.20744e-001, A5 = 1.95666e-003,
A6 = -7.65808e-002, A8 = -1.85170e-002, A10 = 1.30669e-001, A12 = -2.67612e-001,
A14 = 5.88789e-001
12th page
K = 4.72147e + 001, A3 = 3.47848e-002, A4 = -2.42134e-001, A5 = 2.39067e-001,
A6 = -4.01586e-002, A8 = -2.13031e-001, A10 = 5.52927e-002, A12 = -2.30662e-002,
A14 = 1.11740e-002
Side 13
K = -6.81461e + 000, A3 = -1.07431e-001, A4 = -2.80731e-001, A5 = 2.48387e-001,
A6 = 3.07155e-001, A8 = -3.07188e-001, A10 = 3.22283e-003, A12 = 9.69519e-002,
A14 = -3.33563e-002
15th page
K = -1.42099e + 001, A3 = -3.20224e-001, A4 = 7.77760e-002, A5 = 5.12229e-002,
A6 = 3.55687e-002, A8 = -9.46570e-003, A10 = -2.78569e-003, A12 = 6.55579e-004,
A14 = 1.37201e-005
16th page
K = -1.24702e + 001, A3 = -1.48441e-001, A4 = -6.87741e-003, A5 = 2.41497e-002,
A6 = 4.95825e-003, A8 = -1.02330e-002, A10 = 2.00168e-003, A12 = -3.45065e-004,
A14 = 8.07609e-005

The characteristics of the imaging lens of Example 7 are listed below.
FL 2.832
Fno 2.05
w 78.27
Ymax 2.291
BF 0.621
TL 3.178

The single lens data of Example 7 is shown in Table 21 below.
[Table 21]
Elem Surfs Focal Length Diameter
1 3- 4 2.2579 1.305
2 6- 7 -4.3703 1.237
3 9-10 18.8160 1.756
4 12-13 1.9073 2.502
5 15-16 -1.4620 3.638

  FIG. 18 is a cross-sectional view of the imaging lens 27 and the like according to the seventh embodiment. The imaging lens 27 includes, in order from the object side, a first meniscus lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a negative refractive power around the optical axis AX. A second meniscus lens L2 having a convex surface facing the side, a biconvex third lens L3 having a weak positive refractive power around the optical axis AX, and a biconvex third lens L3 having a positive positive refractive power around the optical axis AX. And a meniscus fourth lens L4 having a convex surface facing the image side, and a biconcave fifth lens L5 having negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  FIGS. 19A to 19C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 27 of Example 7, and FIGS. 19D and 19E show the examples. 10 shows meridional coma aberration of the imaging lens 27 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.
OBJ INFINITY 1e + 020
1 INFINITY 0.0500 1.390
STO INFINITY -0.2480 1.390
3 * 1.1053 0.3820 1.54470 56.00 1.390
4 * 25.4045 0.0380 1.309
5 FS INFINITY 0.0160 1.300
6 * 5.8920 0.1410 1.63469 23.86 1.300
7 * 1.6146 0.2360 1.321
8 FS INFINITY 0.0640 1.480
9 * 16.4299 0.3360 1.54470 56.15 1.598
10 * -16.7544 -0.0060 1.757
11 FS INFINITY 0.3770 2.040
12 * -11.0729 0.4030 1.54470 56.15 2.113
13 * -0.8776 -0.3300 2.556
14 FS INFINITY 0.5640 3.140
15 * -3.5905 0.2360 1.54470 56.15 3.390
16 * 0.9964 0.3710 3.663
17 INFINITY 0.1100 1.51633 64.14 4.274
18 INFINITY 0.2820 4.330
IMG INFINITY 0.0000

Table 23 below shows the aspheric coefficients of the lens surfaces of Example 8.
[Table 23]
Third side
K = 1.62514e-001, A4 = -8.98292e-004, A6 = 4.54336e-002, A8 = -2.73319e-003,
A10 = 2.30274e-001, A12 = 3.45125e-001, A14 = -1.32786e + 000
4th page
K = -1.93893e + 001, A4 = 4.35111e-002, A6 = 2.77899e-001, A8 = -2.61310e-002,
A10 = -1.37455e + 000, A12 = -1.50543e + 000, A14 = 2.77206e + 000
6th page
K = -1.36249e + 001, A4 = -7.17390e-002, A6 = 7.05117e-001, A8 = -9.46454e-001,
A10 = -2.16655e + 000, A12 = -4.97699e-001, A14 = 4.96373e + 000
7th page
K = -1.08493e + 001, A3 = -1.27634e-002, A4 = 2.94444e-001, A5 = -9.18674e-003,
A6 = 2.26141e-001, A8 = -2.58022e-001, A10 = -3.83535e-001, A12 = -1.32357e + 000,
A14 = 5.39470e + 000
9th page
K = 6.49613e + 001, A3 = 2.45526e-002, A4 = -3.19033e-001, A5 = 4.25781e-002,
A6 = 2.38811e-001, A8 = -4.63675e-001, A10 = 7.00370e-002, A12 = 2.46346e + 000,
A14 = -2.02429e + 000
10th page
K = 0.00000e + 000, A3 = 2.58179e-003, A4 = -2.32693e-001, A5 = 5.01409e-003,
A6 = -7.32355e-002, A8 = -2.54092e-002, A10 = 1.25676e-001, A12 = -2.64607e-001,
A14 = 6.15434e-001
12th page
K = 2.03388e + 001, A3 = 3.17790e-002, A4 = -2.28753e-001, A5 = 2.27579e-001,
A6 = -4.21970e-002, A8 = -2.06446e-001, A10 = 5.01729e-002, A12 = -2.94495e-002,
A14 = 1.89381e-002
Side 13
K = -6.33003e + 000, A3 = -9.76035e-002, A4 = -2.77113e-001, A5 = 2.50360e-001,
A6 = 3.06966e-001, A8 = -3.09782e-001, A10 = 8.02296e-004, A12 = 9.62978e-002,
A14 = -3.20380e-002
15th page
K = -2.05412e + 001, A3 = -3.20488e-001, A4 = 7.41430e-002, A5 = 4.91917e-002,
A6 = 3.50046e-002, A8 = -9.14111e-003, A10 = -2.62533e-003, A12 = 6.75709e-004,
A14 = -2.00236e-006
16th page
K = -1.03289e + 001, A3 = -1.54387e-001, A4 = -4.13212e-003, A5 = 2.51123e-002,
A6 = 4.88690e-003, A8 = -1.06791e-002, A10 = 1.88157e-003, A12 = -3.41999e-004,
A14 = 9.25579e-005

The characteristics of the imaging lens of Example 8 are listed below.
FL 2.725
Fno 1.96
w 80.45
Ymax 2.295
BF 0.621
TL 3.183

The single lens data of Example 8 is shown in Table 24 below.
[Table 24]
Elem Surfs Focal Length Diameter
1 3- 4 2.1098 1.390
2 6- 7 -3.5496 1.321
3 9-10 15.2836 1.757
4 12-13 1.7258 2.556
5 15-16 -1.4064 3.663

  FIG. 20 is a cross-sectional view of the imaging lens 29 and the like according to the eighth embodiment. The imaging lens 29 includes, in order from the object side, a first meniscus lens L1 having a positive refractive power around the optical axis AX and having 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 biconvex third lens L3 having a weak positive refractive power around the optical axis AX, and a positive refractive power around the optical axis AX. And a meniscus fourth lens L4 having a convex surface facing the image side, and a biconcave fifth lens L5 having negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  FIGS. 21A to 21C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 29 of Example 8, and FIGS. 21D and 21E show the examples. 10 shows meridional coma aberration of the imaging lens 29 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.
OBJ INFINITY 1e + 020
1 FS INFINITY 0.0000 1.430
2 INFINITY -0.2603 1.430
3 * 1.0123 0.4130 1.54470 55.99 1.429
4 * 3.7185 0.0550 1.328
STO INFINITY 0.0000 1.306
6 * 2.8231 0.1500 1.64000 22.99 1.278
7 * 1.6845 0.1800 1.132
8 FS INFINITY 0.1160 1.324
9 * 24.6917 0.1890 1.54470 55.99 1.323
10 * -24.2917 -0.0200 1.454
11 FS INFINITY 0.4360 1.640
12 * -4.0293 0.3300 1.64000 22.99 1.757
13 * -2.7449 -0.3000 2.362
14 FS INFINITY 0.3500 2.988
15 * 1.9631 0.5490 1.54470 55.99 3.508
16 * 1.1114 0.3660 3.775
17 INFINITY 0.1100 1.51633 64.14 4.340
18 INFINITY 0.3400 4.386
IMG INFINITY 0.0000

Table 26 below shows the aspheric coefficients of the lens surfaces of Example 9.
[Table 26]
Third side
K = -6.26507e-002, A4 = 2.38370e-003, A6 = 1.89893e-001, A8 = -3.74627e-001,
A10 = 6.14314e-001, A12 = -8.25390e-001, A14 = 1.52043e + 000
4th page
K = -5.96410e + 001, A4 = -4.16478e-001, A6 = 1.59346e + 000, A8 = -2.37201e + 000,
A10 = -4.83646e-001, A12 = 8.37888e + 000, A14 = -9.12240e + 000
6th page
K = -7.09673e + 001, A4 = -6.60932e-001, A6 = 2.24445e + 000, A8 = -1.67706e + 000,
A10 = -5.36649e + 000, A12 = 1.61208e + 001, A14 = -1.51991e + 001
7th page
K = -2.04738e + 001, A4 = -6.02700e-002, A6 = 1.02572e + 000, A8 = -1.19138e + 000,
A10 = 7.60784e + 000, A12 = -2.49757e + 001, A14 = 3.13844e + 001
9th page
K = 8.00000e + 001, A4 = -5.93743e-001, A6 = 5.51192e-002, A8 = 2.12471e + 000,
A10 = -9.32947e + 000, A12 = 9.57098e + 000, A14 = 3.83357e + 001, A16 = -5.53896e + 001
10th page
K = -8.00000e + 001, A4 = -4.69254e-001, A6 = -3.29722e-001, A8 = 1.70508e + 000,
A10 = -4.39810e + 000, A12 = 6.35402e + 000, A14 = 3.53412e-001
12th page
K = -6.62835e + 001, A4 = 2.21419e-001, A6 = -1.62188e + 000, A8 = 5.81030e + 000,
A10 = -1.95438e + 001, A12 = 3.61305e + 001, A14 = -3.52101e + 001, A16 = 1.35054e + 001
Side 13
K = -1.58612e + 001, A4 = -2.46060e-001, A6 = 1.76650e + 000, A8 = -5.70601e + 000,
A10 = 8.95277e + 000, A12 = -8.01231e + 000, A14 = 3.86179e + 000, A16 = -7.66740e-001
15th page
K = -6.37878e + 001, A4 = -3.69650e-001, A6 = 2.66546e-001, A8 = -7.23684e-002,
A10 = 1.03034e-003, A12 = 3.75390e-003, A14 = -7.66838e-004, A16 = 4.81655e-005
16th page
K = -7.56176e + 000, A4 = -2.23118e-001, A6 = 1.10389e-001, A8 = -3.65242e-002,
A10 = 4.94625e-003, A12 = 4.15199e-005, A14 = -3.77553e-005

The characteristics of the imaging lens of Example 9 are listed below.
FL 2.839
Fno 2.05
w 76.34
Ymax 2.299
BF 0.659
TL 3.227

The single lens data of Example 9 is shown in Table 27 below.
[Table 27]
Elem Surfs Focal Length Diameter
1 3- 4 2.4233 1.429
2 6- 7 -6.8797 1.278
3 9-10 22.5109 1.454
4 12-13 12.2282 2.362
5 15-16 -6.0866 3.775

  FIG. 22 is a cross-sectional view of the imaging lens 30 and the like according to the ninth embodiment. The imaging lens 30 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and having 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 biconvex third lens L3 having a weak positive refractive power around the optical axis AX, and a positive refractive power around the optical axis AX. And a meniscus fourth lens L4 having a convex surface facing the image side, and a biconcave fifth lens L5 having negative refractive power around the optical axis AX. All the lenses L1 to L5 are made of a plastic material. An aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding stops FS1 to FS4 are disposed between the lenses L1 to L5. 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.

  FIGS. 23A to 23C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 30 of Example 9, and FIGS. 23D and 23E show the examples. 10 shows meridional coma aberration of the imaging lens 30 of Example 9. FIG.

Table 28 below summarizes the values of Examples 1 to 9 corresponding to the conditional expressions (1) to (14) for reference.
[Table 28]

  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 light-shielding stops FS1 to FS4 are not limited to metal plates, but can be plate-like members made of resin or ceramics, and can also be incorporated by painting the flange portion 39 of the lens with a light-shielding material. Furthermore, the light-shielding stops FS1 to FS4 are not limited to a complete light-shielding body, and may perform light reduction outside the aperture. When the light-shielding stops FS1 to FS4 are used as light-shielding plates or the like, a plurality of light-shielding plates or the like can be arranged between a pair of lenses.

  DESCRIPTION OF SYMBOLS 10 ... Imaging lens, 50 ... Camera module, 51 ... Imaging device, 100 ... Imaging device, 300 ... Portable terminal, AX ... Optical axis, L1-L5 ... Lens, AS ... Aperture stop, FS1-FS4 ... Light-shielding stop, I ... Imaging surface (image surface)

Claims (21)

In order from the object side, a positive first lens having a convex surface facing the object side, a second lens, a third lens, a fourth lens, and a fifth lens having a concave surface facing the image side,
The image side surface of the fifth lens is aspheric and has an inflection point within the effective diameter,
At least one of the second lens and the third lens is a negative lens;
The aperture stop is closer to the object side than the third lens,
A light-shielding diaphragm between the third lens and the fourth lens and between the fourth lens and the fifth lens;
The imaging lens, wherein the image side surface of the third lens has an inflection point, and a part or all of 70% or more of the effective diameter has a negative power. 2. The imaging lens according to claim 1, wherein an object side surface of the fourth lens has an aspherical shape and satisfies the conditional expression (1).
0.015 <AS7 / f <0.07 (1)
However,
AS7: Maximum deviation (mm) between the aspherical shape of the object side surface of the fourth lens and the spherical shape connecting the effective diameter position and the center point of the fourth lens
f: Focal length of the entire imaging lens system The imaging lens according to claim 1, wherein the conditional expression (2) is satisfied.
0.75 <dΦ / dz <2.5 (2)
dΦ: difference between the diameter of the light-shielding diaphragm between the fourth and fifth lenses and the diameter of the light-shielding diaphragm between the third and fourth lenses dz: the light-shielding diaphragm between the fourth and fifth lenses and the third and fourth lenses Distance between the fourth lens and the light-shielding diaphragm The imaging lens according to claim 1, wherein the conditional expression (3) is satisfied.
0.03 <et6 / f <0.10 (3)
et6: Distance in the optical axis direction between the effective diameter position of the image side surface of the third lens and the effective diameter position of the object side surface of the fourth lens f: Focal length of the entire imaging lens system The imaging lens according to claim 1, wherein the conditional expression (4) is satisfied.
40 <θS7 <80 (4)
However,
θS7: Maximum surface angle (°) at 70% or more of the effective diameter of the object side surface of the fourth lens The imaging lens according to claim 1, wherein the conditional expression (5) is satisfied.
| Sag6 | / f <0.10 (5)
However,
| Sag6 |: Maximum sag amount on the image side surface of the third lens f: Focal length of the entire imaging lens system The imaging lens according to any one of claims 1 to 6, wherein conditional expression (6) is satisfied.
−15 <θS6 <15 (6)
However,
θS6: Maximum surface angle (°) at 90% or more of the effective diameter of the image side surface of the third lens The imaging lens according to claim 1, wherein the conditional expression (7) is satisfied.
0.65 <Sag7 / d7 <1.50 (7)
However,
Sag7: Maximum sag amount on the object side surface of the fourth lens d7: Center thickness of the fourth lens The imaging lens according to any one of claims 1 to 8, wherein conditional expression (8) is satisfied.
0.45 <θr6 / θr4 <1.00 (8)
However,
θr4: refraction angle of the peripheral ray far from the optical axis of the diagonal image high light beam on the image side surface of the second lens θr6: peripheral edge of the third lens on the image side of the diagonal image high beam far from the optical axis Ray angle of refraction The imaging lens according to any one of claims 1 to 9, wherein conditional expression (9) is satisfied.
0.05 <et8 / f <0.20 (9)
However,
et8: Distance in the optical axis direction between the effective diameter position of the image side surface of the fourth lens and the effective diameter position of the object side surface of the fifth lens f: Focal length of the entire imaging lens system The imaging lens according to any one of claims 1 to 10, wherein the fifth lens is a negative lens and satisfies the conditional expression (10).
45 <v5 <70 (10)
However,
v5: Abbe number of the fifth lens The imaging lens according to claim 1, wherein the conditional expression (11) is satisfied.
1.45 <n1 <1.65 (11)
However,
n1: Refractive index of the first lens   The imaging lens according to any one of claims 1 to 12, wherein the second lens is a negative lens.   The imaging lens according to any one of claims 1 to 13, wherein the second lens has an absolute value of the curvature radius of the image side surface smaller than the absolute value of the curvature radius of the object side surface.   The imaging lens according to any one of claims 1 to 14, wherein an image side surface of the second lens has a negative power partly or entirely of 70% or more of the effective diameter. The imaging lens according to claim 13, wherein the conditional expression (12) is satisfied.
15 <v2 <30 (12)
However,
v2: Abbe number of the second lens The imaging lens according to claim 1, wherein the conditional expression (13) is satisfied.
-0.2 <f / f4 <2.0 (13)
However,
f4: focal length of the fourth lens The imaging lens according to claim 1, wherein the conditional expression (14) is satisfied.
1.1 <f123 / f <1.7 (14)
However,
f123: Composite focal length from the first lens to the third lens   The imaging lens according to any one of claims 1 to 18, further comprising a lens having substantially no power.   An imaging apparatus comprising: the imaging lens according to any one of claims 1 to 19; and an imaging element.   A portable terminal comprising the imaging device according to claim 20.

Images