TW201432294A - Image pickup lens, image pickup apparatus, and portable terminal - Google Patents

Abstract

The utility model relates to a camera lens, a camera device and a mobile terminal. The object of the utility model is to provide a camera lens composed of 5 lenses, even though the structure of the camera lens is smaller than that of a present camera lens, diffuse lights produced by the camera lens are reduced, and various aberrations can be well corrected. The camera lens (10) makes a shot object image to be formed on a shooting surface (also a projected surface ) (I) of a shooting member (51), and has a positive first lens (L1) with a convex surface facing to an object side, a second lens (L2) nearby an optical axis (AX) and forming a negative lens, a third lens (L3), a forth lens (L4) and a negative fifth lens (L5) with a concave surface facing to an image side, wherein the five lenses are sequentially arranged from the object side. The camera lens (10) satisfies expressions of 0.75(d[phi]/dz(2.5...(1) and the like, wherein the value of d[phi] represents a difference value between an internal diameter of an opening portion of a shading diaphragm between the forth lens and the fifth lens and an internal diameter of an opening portion of a shading diaphragm between the third lens and the forth lens, and dz represents an interval in the optical axis direction of the shading diaphragm between the forth lens and the fifth lens and the shading diaphragm between the third lens and the forth lens.

Description

Camera lens, camera device and portable terminal

The invention relates to a small camera mirror for suppressing stray light In particular, the present invention relates to an imaging lens, an imaging device, and a portable terminal having five lenses and suitable for a short back.

In recent years, with the use of an imaging device such as a CCD (Charged Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor, the image sensor has high performance and miniaturization. Telephone or portable information terminals have become increasingly popular. In addition, recently, the image sensor is required to be highly pixelated due to the increase in size and definition of the display elements mounted on the portable information terminal as described above, and the image pickup lens mounted on these imaging devices is There is a strong demand for further high performance. In the imaging lens of such a use, an imaging lens having a five-piece configuration has been proposed for the purpose of achieving higher performance than a lens having three or four lenses (see, for example, Patent Document 1). On the other hand, portable information terminals are also When it is required to be thinner, the imaging lens mounted on the imaging device is also strongly required to be short-cut, and the number of lenses is increased in order to achieve high performance, and it is also necessary to achieve the same or a shorter profile. However, if the short back is continued, the distance traveled in the direction of the optical axis becomes shorter, but the distance traveled in the vertical direction of the optical axis does not change, so that the light is sandwiched with respect to the optical axis in the lens. Angle. As a result, light is easily incident on the effective area of the lens, and stray light is likely to be generated.

In order to solve the problem of stray light, as the aperture in the aperture In addition to the five-piece imaging lens having a light-shielded aperture, the first lens, the second lens, the third lens, and the fourth lens having positive refractive power sequentially have an inflection point from at least one side of the object side. The fifth lens of the aspherical surface is provided with an aperture lens that is fixed between the first lens and the third lens, and an aperture lens that is fixed between the third lens and the fifth lens. It is disclosed (refer to Patent Document 2).

However, the imaging lens described in Patent Document 2 is described above. In one case, the difference between the aperture between the aperture between the third and fourth lenses and the aperture between the fourth and fifth lenses is small, resulting in a larger angle to the optical axis through the third lens. The light is incident on the flange portion of the fourth lens or the flange portion of the fifth lens, and stray light is likely to be generated. In another case, the distance between the third and fourth lenses is too close to insert the light-shielding aperture, and the effect of preventing the occurrence of stray light cannot be expected. In another case, since the surface angle of the side surface of the fourth lens object is small, the incident angle of the light beam having a large angle to the optical axis after passing through the third lens toward the side surface of the fourth lens object is large. Causes a large coma aberration or chromatic aberration of magnification.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] International Publication No. 2010/024198

[Patent Document 2] Chinese Utility Model Announcement No. 202330849

The present invention has been made in view of the above problems of the background art. The purpose of the invention is to provide a five-piece imaging lens that is smaller than the previous type, has less stray light, and is well corrected for various aberrations.

Here, the scale of the small imaging lens is in the present invention The goal is to achieve miniaturization to the extent that the following formula is met. By satisfying this range, the entire imaging device can be miniaturized.

L/2Y<0.90 (16) where L: the distance from the most object-side lens surface of the entire lens of the imaging lens to the optical axis of the image side focus

2Y: The imaging unit faces the angular length (the diagonal length of the rectangular effective effect pixel area of the imaging element)

Here, the image side focus refers to an image point when a parallel light that is parallel to the optical axis is incident on the imaging lens. In addition, an optical low-pass filter, an infrared cut filter, or a cover glass of an image sensor package is disposed in parallel between the image-side surface of the image pickup lens and the image-side focus position. In the case of a flat plate, the parallel flat plate portion is regarded as the air conversion distance and then the value of L is calculated.

Regarding the value L/2Y, the ideal system may also be in the range of the following formula.

L/2Y<0.78...(16’)

In order to achieve the above object, the first imaging lens according to the present invention is a positive first lens, a second lens, a third lens, a fourth lens, and a concave facing image from the object side in order from the convex surface toward the object side. The fifth lens is formed on the side; the image side surface of the fifth lens is aspherical and has an inflection point in the effective diameter; at least one of the second lens and the third lens is a negative lens; and the aperture aperture is smaller than the third lens Further, it is closer to the object side, and has a light-shielding aperture between the third lens and the fourth lens and between the fourth lens and the fifth lens, and satisfies the conditional expressions (1), (2), and (3) described below.

0.75<dΦ/dz<2.5...(1)

0.03<et6/f<0.10...(2)

40< θ S7<80 (3) where dΦ is the difference between the inner diameter of the opening portion of the light-shielding aperture between the fourth and fifth lenses and the inner diameter of the opening portion of the light-shielding aperture between the third and fourth lenses.

Dz: the distance between the light-shielding aperture between the fourth and fifth lenses and the optical axis of the light-shielding aperture between the third and fourth lenses

Et6: the distance between the effective diameter position of the image side of the third lens and the optical axis direction of the effective diameter position of the object side of the fourth lens

f: The focal length of the entire camera lens (the same applies to the following equation).

θS7: the maximum surface angle (°) of the effective diameter 7 of the object side of the fourth lens

In the first imaging lens according to the present invention, the first lens has a convex surface facing the object side, whereby the position of the principal point of the entire system is close to the object side, which is advantageous for shortening the entire optical length. Then, by designing the image side surface of the fifth lens to be concave, the back focus can be extended, so that the desired rear focus required when the AF mechanism or the like is disposed can be secured. Then, by designing the image side surface of the fifth lens as an aspherical surface having an inflection point in the effective diameter, the incident angle at which the light of the peripheral image is incident on the image plane can be suppressed to be small, so that it can be improved. The light receiving efficiency of the sensor when the imaging element is used. 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 incident angle of the sensor can be suppressed to be small.

When the imaging lens having five lenses according to the present invention is made to be low-profile, it is necessary to concentrate the positive power on the lens on the object side among the five lenses, thereby making the main point of the whole system The position is close to the object side, and even the interval between the lenses must be shortened to make the field occupied by the lens in the optical full length smaller. In addition, if a large diameter is required, since a large spherical aberration occurs on the convex surface of the object side of the first lens at this time, it is necessary to correct the spherical aberration of the lens after the second lens. In this case, since the negative lens having a high beam height on the axis can correct the spherical aberration relatively effectively, at least one of the second lens or the third lens having a high axial ray height near the object side is designed. A negative lens can effectively correct the spherical aberration. However, if you continue to make a short back, you will have a larger angle than the maximum angle. The light incident on the imaging lens will have a large angle to the optical axis after the negative lens is passed through, so that it will enter the outside of the effective path of the fourth lens or the fifth lens, and stray light is likely to be generated.

Therefore, in the first imaging lens, the light-shielding aperture is disposed between the third and fourth lenses and between the fourth and fifth lenses, and the light-shielding aperture I and the third lens are interposed between the third and fourth lenses. The light-shielding aperture II between the 4th and the 5th lens is designed to satisfy the conditional expression (1), whereby stray light can be avoided. By exceeding the lower limit of the value dΦ/dz of the conditional expression (1), the aperture of the opaque aperture I is small relative to the aperture of the opaque aperture II, even for a light having a large angle to the optical axis, Since the flange portion of the lens 4 is sufficiently shielded from light, stray light caused by light incident on the flange portion of the fourth lens can be prevented. On the other hand, the aperture of the opaque aperture II is not excessively large with respect to the aperture of the opaque aperture I by the upper limit of the value dΦ/dz of the conditional expression (1). Therefore, the flange portion of the fifth lens can be sufficiently provided. The shading prevents the stray light caused by the light incident on the flange portion of the fifth lens.

Further, regarding the value dΦ/dz, it is preferable that the range is the following formula.

0.90<dΦ/dz<2.0...(1’)

Further, in the first imaging lens, the value et6/f of the conditional expression (2) for the interval between the third lens and the fourth lens is exceeded, and the periphery of the third lens and the fourth lens can be secured. Insert the interval for the shutter I. On the other hand, by setting the value et6/f of the conditional expression (2) below the upper limit, it is possible to prevent the short-cut from being hindered because the interval is too wide.

Further, regarding the value et6/f, it is preferable to be in the range of the following formula.

0.05<et6/f<0.08...(2’)

Further, in the first imaging lens, the value θS7 of the conditional expression (3) which is the slope of the outer edge of the object side surface of the fourth lens exceeds the lower limit, and is refracted by the third lens to be compared with the optical axis. The large-angle light is designed to be close to the vertical plane angle, whereby the angle of refraction can be suppressed to be small, so that generation of coma aberration or the like can be suppressed. On the other hand, by setting the value θS7 of the conditional expression (3) below the upper limit, it is possible to prevent the formability from being impeded because the surface angle is excessively large.

Further, regarding the value θS7, a range of the following formula is preferable.

50< θ S7<75...(3')

In order to achieve the above object, the second imaging lens according to the present invention is a positive first lens, a second lens, a third lens, a fourth lens, and a concave facing image from the object side in order from the convex surface toward the object side. The fifth lens is formed on the side; the image side surface of the fifth lens is aspherical and has an inflection point in the effective diameter; at least one of the second lens and the third lens is a negative lens; and the aperture aperture is smaller than the third lens Further, it is closer to the object side, and has a light-shielding aperture between the third lens and the fourth lens and between the fourth lens and the fifth lens, and satisfies the conditional expression (4) below.

1.2<dΦ/dz<2.5 (4) where dΦ: the inner diameter of the opening portion of the light-shielding aperture between the fourth and fifth lenses, and the inner diameter of the opening portion of the light-shielding aperture between the third and fourth lenses difference

Dz: the distance between the light-shielding aperture between the fourth and fifth lenses and the optical axis of the light-shielding aperture between the third and fourth lenses

In the second imaging lens according to the present invention, the first lens has a convex surface facing the object side, whereby the position of the principal point of the entire system is close to the object side, which is advantageous for shortening the total optical length. Then, by designing the image side surface of the fifth lens to be concave, the back focus can be extended, so that the desired rear focus required when the AF mechanism or the like is disposed can be secured. Then, by designing the image side surface of the fifth lens as an aspherical surface having an inflection point in the effective diameter, the incident angle at which the light of the peripheral image is incident on the image plane can be suppressed to be small, so that it can be improved. The light receiving efficiency of the sensor when the imaging element is used. 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 incident angle of the sensor can be suppressed to be small.

In order to design the imaging lens having five lenses as described in the present invention to have a short back and a large diameter, it is considered that the second lens or the first light having a higher height on the axis near the object side is considered as described above. At least one of the three lenses is designed as a negative lens, but the light that has passed through the third lens enters the effective path of the fourth lens or the fifth lens, causing a problem that stray light is likely to be generated.

Then, a light-shielding aperture is disposed between the third and fourth lenses and between the fourth and fifth lenses, and the light-shielding aperture I between the third and fourth lenses and the fourth and fifth lenses are shielded from each other. The aperture II is designed to satisfy the conditional expression (4), whereby stray light can be avoided. By exceeding the lower limit of the value dΦ/dz of the conditional expression (4), the aperture I is opaque with respect to the aperture of the opaque aperture II The aperture of the fourth lens can be sufficiently shielded even for light having a large angle with respect to the optical axis emitted from the third lens, thereby preventing the light from entering the fourth lens. Stray light caused by the flange portion. On the other hand, the aperture of the opaque aperture II is not excessively large with respect to the aperture of the opaque aperture I by the upper limit of the value dΦ/dz of the conditional expression (4), so that the flange portion of the fifth lens can be sufficiently provided. The shielding prevents the stray light caused by the light incident on the flange portion of the fifth lens.

Further, regarding the value dΦ/dz, it is preferable that the range is the following formula.

1.35<dΦ/dz<1.8...(4’)

According to the specific aspect of the present invention, in the first and second imaging lenses described above, the object side surface of the fourth lens has an aspherical shape and satisfies the conditional expression (5).

0.015<AS7/f<0.07 (5) where AS7 is the aspherical shape of the object side surface of the fourth lens, and the maximum deviation amount from the optical axis direction of the spherical shape of the fourth lens and the spherical shape of the center point. (mm).

The peripheral portion of the object side surface of the fourth lens is the third The lens is refracted and the image is imaged at a high angle to the optical axis at a high angle, and is designed to be close to a vertical plane angle, whereby the angle of refraction of the light can be suppressed to be small, and the occurrence of coma aberration or the like can be suppressed. However, if the shape is close to the spherical shape and the surface angle of the peripheral portion is approximately perpendicular to the light, the amount of depression of the surface becomes large, and the area occupied by the fourth lens in the optical full length becomes large. Will become a hindrance to short stature. By making the object side surface of the fourth lens have an aspherical shape and the value AS7/f exceeds the lower limit of the conditional expression (5), the shape can be changed from the spherical shape, so that even the surface angle of the peripheral portion is made The light is approximately vertical, and can still be a shape with a small amount of concave on the surface, which is advantageous for the short back. On the other hand, by setting the value AS7/f of (5) below the upper limit, it is possible to prevent excessive detachment from the spherical shape and to prevent damage to the formability of the lens.

Here, the object side or the fifth lens for the first lens The image side surface is shaped such that the effective diameter 5 is stopped. When only the term of R is fitted by the least square method, the center of curvature is defined as concave if it is air side, and convex if it is medium side. Further, although only the present specification is used, the terms near the optical axis and the periphery of the optical axis are defined by the above-mentioned definitions unless otherwise stated.

Further, regarding the value AS7/f, it is preferable to be in the range of the following formula.

0.02<AS7/f<0.05...(5’)

In another aspect of the invention, the aperture stop is closer to the object side than the second lens.

In still another aspect of the present invention, the conditional expression (6) is satisfied: | Sag6 | / f < 0.10 (6) wherein |Sag6|: the maximum amount of depression of the image side surface of the third lens.

By setting the value |Sag6|/f to satisfy the conditional expression (6), the amount of depression of the image side surface of the third lens is reduced, so that the third lens occupies the field of the optical axis direction in the entire length of the lens. Can be reduced, so it is conducive to short stature.

Further, regarding the value |Sag6|/f, it is preferable that the range is the following formula.

| Sag6 |/f<0.05...(6’)

In still another aspect of the present invention, the conditional expression (7) is satisfied: -15 < θ S6 < 15 (7), wherein θS6: a maximum surface angle of 90% or more of the effective diameter of the side surface of the third lens image (°) ).

By setting the value θS6 to satisfy the range of the conditional expression (7), the peripheral ray of the light beam imaged at the peripheral image height can be divulably diverge, so that the third lens can be easily attached to the optical axis after passing Larger angles are conducive to short stature.

Further, regarding the value θS6, a range of the following formula is preferable.

-10< θ S6<10...(7')

In still another aspect of the present invention, the conditional expression (8) is satisfied: 0.65<| Sag7 |/d7<1.50 (8) wherein |Sag7|: Maximum amount of depression on the side of the object of the 4th lens

D7: The center thickness of the fourth lens.

By exceeding the lower limit of the value |Sag7|/d7 of the conditional expression (8), the field of the optical axis direction occupied by the object side surface of the fourth lens in the imaging lens becomes large, and thus the shape freedom of the side surface of the fourth lens object is increased. It becomes large, and it can form the shape which does not generate|occur|produce the aberration with respect to the light which passes after a 3rd lens. On the other hand, by lowering the value |Sag7|/d7 below the upper limit of the conditional expression (8), the amount of depression of the object side surface of the fourth lens is not excessively large, and it is effective for the short-back.

Further, regarding the value |Sag7|/d7, it is preferable that the range is the following formula.

0.75<| Sag7 |/d7<1.30...(8’)

In still another aspect of the present invention, the conditional expression (9) is satisfied: 0.45 < θ r6 / θ r4 < 1.00 (9) wherein θr4: the off-beam of the diagonal image beam on the image side surface of the second lens Refraction angle of the peripheral ray on the far side of the axis

Θr6: the angle of refraction of the peripheral ray on the image side of the third lens on the far side from the optical axis of the high beam.

By exceeding the lower limit of the value θr6/θr4 of the conditional expression (9), the divergence of the light can be distributed by the image side surface of the second lens and the image side surface of the third lens, so that the occurrence of aberration can be suppressed to be small. . On the other hand, by making the value θr6/θr4 lower than the upper limit of the conditional expression (9), it is possible to prevent The light of the third lens is excessively dissipated to cause aberration.

Further, regarding the value θr6 / θr4, a range of the following formula is preferable.

0.50< θ r6/ θ r4<0.90...(9')

In still another aspect of the present invention, the conditional expression (10) is satisfied: 0.05<et8/f<0.20 (10) wherein et8: the effective diameter position of the image side surface of the fourth lens and the object side surface of the fifth lens The interval between the optical axis directions of the effective path positions.

By exceeding the lower limit of the value et8/f of the conditional expression (10), it is possible to secure a gap for the light-shielding aperture II between the fourth lens and the fifth lens, by setting the value et8/f lower than the conditional expression (10). The upper limit of the film prevents the interval between the fourth lens and the fifth lens from being too large and hinders the shortening.

Further, regarding the value et8/f, it is preferable to be in the range of the following formula.

0.07<et8/f<0.15...(10’)

In still another aspect of the present invention, the fifth lens is a negative lens and satisfies the conditional expression (11): 45 < v5 < 70 (11), wherein v5: the Abbe number of the fifth lens.

By designing the fifth lens as a negative lens, it is possible to ensure a certain degree of back focus while ensuring a short back, thereby reducing the lens attachment. The effect of dust or scratches. Further, since the image side surface of the fifth lens has an inflection point, the peripheral portion has a positive refractive power, but the Abbe number v5 of the fifth lens is set to exceed the lower limit of the conditional expression (11). Therefore, the chromatic aberration generated on the peripheral portion of the fifth lens can be suppressed, so that the chromatic aberration of magnification can be reduced, and the performance can be improved. On the other hand, by making the Abbe number v5 lower than the upper limit of the conditional expression (11), it is a negative lens and thus it is possible to suppress the generation of axial chromatic aberration.

Further, regarding the value v5, it is preferable to be in the range of the following formula.

50<v5<60...(11’)

In still another aspect of the present invention, the conditional expression (12) is satisfied: 1.45 < n1 < 1.65 (12) wherein n1: the refractive index of the first lens.

If the dwarf is continued, the position of the main point of the whole system will be directed to the object side, and therefore the radius of curvature of the convex surface of the object side of the first lens will become small. This will result in light incident on the periphery of the entrance pupil with a large spherical aberration. In particular, in the case of a large diameter, the spherical aberration is remarkably large, 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, so that the convex surface of the object side can be prevented from being excessively large, resulting in a large spherical surface. Aberration. On the other hand, when the refractive index of the first lens is increased, the interval between the front main point and the rear main point of the first lens is opened, and thus the off The main point on the rear side connected to the focal length will lean toward the image side, resulting in a shorter focal length and a wider angle. In order to bring the first principal side of the first lens closer to the object side, and the first lens itself is directed toward the object side, the optical total length is increased, which is disadvantageous for the shortening. By making the convex surface on the object side stronger and approaching the crescent shape, it is possible to maintain the optical total length and bring the rear main point closer to the object side, but this causes a large spherical aberration. Therefore, by setting the refractive index n1 of the first lens to be lower than the upper limit of the conditional expression (11), it is possible to maintain the shortness of the first lens and prevent the convex surface on the object side from being excessively strong, and the spherical aberration generated by the first lens can be obtained. The inhibition is smaller.

Further, regarding the value n1, a range of the following formula is preferable.

1.50<n1<1.60...(12’)

In still another aspect of the invention, the second lens is a negative lens. In this way, by designing the second lens as a negative lens, the chromatic aberration or spherical aberration generated on the first lens can be corrected by the second lens having a high light height, so that it can be effectively corrected and is advantageous. High performance.

In still another aspect of the present invention, in the second lens, the absolute value of the curvature radius of the image side surface is smaller than the absolute value of the curvature radius of the object side surface. The incident angle of the light to the side surface of the second lens object can be reduced, and the spherical aberration can be corrected appropriately to maintain high performance.

In still another aspect of the present invention, the image side surface of the second lens is such that a part or all of the effective diameter of 70% or more has a negative refractive power. Alternatively, the image side surface of the second lens is inclined toward the image side at the effective diameter position. Thus, the image side surface of the second lens has negative light on the outer peripheral side. The power or the surface of the effective diameter position of the image side surface of the second lens is inclined toward the image side, so that the peripheral light of the light beam that is imaged toward the peripheral image is easily refracted and diverged, thereby facilitating the short-back or magnification. Correction of chromatic aberrations.

In still another aspect of the present invention, the conditional expression (13) is satisfied: 15 < v2 < 30 (13), wherein v2: the Abbe number of the second lens.

By making the Abbe number v2 of the second lens lower than the upper limit of the conditional expression (13), the axial chromatic aberration and the lateral chromatic aberration generated in the first lens can be compensated. On the other hand, by making the Abbe number v2 exceed the lower limit of the conditional expression (13), excessive correction of chromatic aberration can be prevented.

Further, regarding the value v2, it is preferable that the range is the following formula.

20<v2<25...(13’)

In still another aspect of the present invention, the conditional expression (14) is satisfied: -0.2 < f / f4 < 2.0 (14)

F4: focal length of the fourth lens.

By making the correlation value f/f4 of the focal length of the fourth lens lower than the upper limit of the conditional expression (14), it is possible to prevent the positive refractive power of the fourth lens from being too strong, resulting in a short focal length of the entire system, resulting in redundancy. Wide angle. Further, by setting the focal length f4 of the fourth lens to exceed the lower limit of the conditional expression (14), it is possible to prevent the fourth lens from having a too strong negative power and causing the whole system. The focal length of the system is too long and too far.

In still another aspect of the present invention, the conditional formula (15) is satisfied: 1.1 < f123 / f < 1.7 (15)

F123: composite focal length from the first lens to the third lens.

By setting the correlation value f123/f of the combined focal length of the first lens to the third lens within the range of the conditional expression (15), the positive refractive power of the first lens to the third lens can be made appropriate. It is possible to prevent the occurrence of aberrations due to excessive positive power and to reduce the total length of the optical.

In still another aspect of the present invention, the aperture stop is closer to the object side than the second lens, and the second and fifth lenses are negative lenses, and satisfy conditional expression (14): -0.2 < f / f4 < 2.0 ( 14)

In still another aspect of the invention, there is also a lens having substantially no power.

In order to achieve the above object, an imaging device according to the present invention includes the above-described imaging lens and imaging element. By using the imaging lens of the present invention, it is possible to obtain a small imaging device in which the stray light is small and the aberrations are well corrected.

In order to achieve the above object, the portable terminal of the present invention includes the above-described imaging device.

10‧‧‧ camera lens

39‧‧‧Flange

50‧‧‧ camera module

51‧‧‧Photographic components

51a‧‧‧Photoelectric Conversion Department

52‧‧‧Wiring substrate

54‧‧‧Mirror tube

55a‧‧‧Drive mechanism

100‧‧‧ camera

103‧‧‧Control Department

105‧‧‧Optics Department

107‧‧‧Photographic component drive unit

108‧‧‧Image memory

300‧‧‧Portable terminal

310‧‧‧Control Department

320‧‧‧Display Operation Department

330‧‧‧Operation Department

340‧‧‧Wireless Communications Department

341‧‧‧Antenna

360‧‧‧Memory (ROM)

370‧‧‧ Temporary Memory (RAM)

AS‧‧‧ aperture

AS7‧‧‧ aspherical shape

AX‧‧‧ optical axis

FS‧‧ ‧ shading aperture

FS1‧‧‧shading aperture

FS2‧‧‧shading aperture

FS3‧‧‧shade aperture

FS4‧‧‧ shading aperture

I‧‧‧ imaging surface

II‧‧‧shading aperture

L1‧‧‧1st lens

L2‧‧‧2nd lens

L3‧‧‧3rd lens

L4‧‧‧4th lens

L5‧‧‧5th lens

LA‧‧‧Light

LA2‧‧‧ peripheral light

OP‧‧‧ openings

P‧‧‧reflexion point

S11‧‧‧ lens surface

S21‧‧‧ lens surface

S22‧‧‧ lens surface

S32‧‧‧ lens surface

S41‧‧‧ lens surface

S42‧‧‧ lens surface

S51‧‧‧ lens surface

S52‧‧‧ lens surface

SP‧‧‧Spherical shape

F‧‧‧parallel plate

Fig. 1 is an explanatory view of an image pickup apparatus including an image pickup lens according to an embodiment of the present invention.

[Fig. 2] A partially enlarged cross-sectional view for explaining the state of a lens or a light-shielding aperture.

FIG. 3 is a block diagram for explaining a portable terminal including the imaging device of FIG. 1. FIG.

4A and 4B are perspective views of a front side and a back side of a portable terminal, respectively.

Fig. 5 is a detailed explanatory view of an object side surface of a fourth lens.

Fig. 6 is a cross-sectional view of the imaging lens of the first embodiment.

7] FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 1. FIG.

Fig. 8 is a cross-sectional view of the imaging lens of the second embodiment.

9] FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 2. FIG.

Fig. 10 is a cross-sectional view showing an image pickup lens of a third embodiment.

11A to 11E are aberration diagrams of the imaging lens of Example 3.

Fig. 12 is a cross-sectional view showing an image pickup lens of a fourth embodiment.

13] FIGS. 13A to 13E are aberration diagrams of the imaging lens of Example 4. FIG.

Fig. 14 is a cross-sectional view showing the imaging lens of the fifth embodiment.

15A to 15E are aberration diagrams of the imaging lens of Example 5.

Fig. 16 is a cross-sectional view showing an image pickup lens of a sixth embodiment.

17A to 17E are aberration diagrams of the imaging lens of Example 6.

Fig. 18 is a cross-sectional view showing an image pickup lens of a seventh embodiment.

19A to 19E are aberration diagrams of the imaging lens of Example 7.

Fig. 20 is a cross-sectional view showing an image pickup lens of a eighth embodiment.

21A to 21E are aberration diagrams of the imaging lens of Example 8.

Fig. 22 is a cross-sectional view showing an image pickup lens of a ninth embodiment.

23A to 23E are aberration diagrams of the imaging lens of Example 9.

Fig. 24 is a cross-sectional view showing an image pickup lens of a tenth embodiment.

25A to 25E are aberration diagrams of the imaging lens of Example 10.

Fig. 26 is a cross-sectional view showing the imaging lens of the eleventh embodiment.

27A to 27E are aberration diagrams of the imaging lens of Example 11.

Fig. 28 is a cross-sectional view showing an image pickup lens of a twelfth embodiment.

29] 29A to 29E are aberration diagrams of the imaging lens of Example 12.

Fig. 30 is a cross-sectional view showing an image pickup lens of a thirteenth embodiment.

31A to 31E are aberration diagrams of the imaging lens of Example 13.

32] A cross-sectional view of an imaging lens of Example 14.

33A to 33E are aberration diagrams of the imaging lens of Example 14.

Fig. 34 is a cross-sectional view showing the imaging lens of the fifteenth embodiment.

35A to 35E are aberration diagrams of the imaging lens of Example 15.

Fig. 36 is a cross-sectional view showing the imaging lens of the sixteenth embodiment.

37A to 37E are aberration diagrams of the imaging lens of Example 16.

38] A cross-sectional view of an image pickup lens of Example 17.

39] 39A to 39E are aberration diagrams of the imaging lens of Example 17.

Fig. 40 is a cross-sectional view showing an image pickup lens of Example 18.

41A to 41E are aberration diagrams of the imaging lens of Example 18.

Fig. 42 is a cross-sectional view showing an image pickup lens of Example 19.

43] 43A to 43E are aberration diagrams of the imaging lens of Example 19.

Fig. 44 is a cross-sectional view showing an image pickup lens of Example 20.

45A to 45E are aberration diagrams of the imaging lens of Example 20.

Hereinafter, an imaging lens according to an embodiment of the present invention will be described with reference to Fig. 1 and the like. In addition, the imaging lens 10 illustrated in FIG. 1 is associated with The imaging lens 11 of the first embodiment to be described later has the same configuration.

Fig. 1 is a cross-sectional view for explaining 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 element 51 that detects a subject image formed by the imaging lens 10, and a wiring substrate that holds the imaging element 51 from behind and has wiring or the like. A lens barrel portion 54 that holds the imaging lens 10 and the like and has an opening OP for allowing a light beam from the object side to enter. The imaging lens 10 has a function of imaging a subject image on the image plane or imaging surface (projected surface) I of the imaging element 51. The camera module 50 is used by being incorporated in an imaging device to be described later, but may be referred to as an imaging device alone.

The imaging lens 10 includes the aperture stop AS, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 in order from the object side. The imaging lens 10 is small in size, and as a measure thereof, the object is to achieve miniaturization to the extent that the following formula (16) is satisfied.

L/2Y<0.90...(16)

Here, L is the distance from the most object-side lens surface S11 of the entire imaging lens 10 to the optical axis AX from the image side focus, and 2Y is the imaging facing angle of the imaging element 51 (image pickup element) The diagonal length of the rectangular effective pixel field of 51, the image side focus refers to an image point when the imaging lens 10 is incident on parallel rays parallel to the optical axis AX. By satisfying this range, the entire camera module 50 can be miniaturized.

Further, an optical low-pass filter and infrared rays are disposed between the most image-side surface S52 and the image-side focus position of the imaging lens 10. In the case of cutting off the parallel plate F of the filter or the cover glass of the image sensor package, the parallel plate F portion is regarded as the air conversion distance and then the value of L is calculated. Further, it is preferable to be in the range of the following formula.

L/2Y<0.78...(16’)

The imaging element 51 is a sensor wafer formed of a solid-state imaging element. The photoelectric conversion portion 51a of the imaging element 51 is formed of a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and photoelectrically converts incident light to RGB, and outputs an analog signal. The surface of the photoelectric conversion portion 51a as the light receiving portion is an image surface or an imaging surface (projected surface) I.

The wiring board 52 has a function of positioning and fixing the image pickup element 51 to another member (for example, the barrel portion 54). The wiring substrate 52 receives a supply of a voltage or a signal required for driving the image pickup element 51 or the drive mechanism 55a from an external circuit, and outputs a detection signal to an external circuit or the like.

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

The lens barrel portion 54 houses and holds the image pickup lens 10. The lens barrel portion 54 is provided with, for example, a drive mechanism 55a in order to move one or more of the lenses L1 to L5 constituting the imaging lens 10 along the optical axis AX to cause the imaging lens 10 to perform a focusing operation. The drive mechanism 55a is provided with, for example, a voice coil motor and a guide rail, and can reciprocate a specific lens along the optical axis AX.

The image held in the barrel portion 54 will be described with reference to FIG. 2 and the like. The state of the lens 10. Each of the first to fifth lenses L1 to L5 constituting the imaging lens 10 has a flange portion 39 for support, and is laminated with an adjacent lens via the flange portion 39, and is held in the barrel portion 54a. The first to fourth light-shielding apertures FS1 to FS4 sandwiched by the flange portion 39 are disposed between the lenses L1 to L5 to prevent the occurrence of stray light. The first to fourth shading apertures FS1 to FS4 are formed, for example, of a thin metal plate. An aperture stop AS covering the periphery of the effective diameter of the lens L1 is formed on the object side of the barrel portion 54a.

Next, referring to FIG. 3, FIG. 4A and FIG. An example of a mobile phone or other portable terminal 300 of the camera module 50 exemplified.

The portable terminal 300 is a mobile phone type mobile phone The video terminal includes: an imaging device 100 having a camera module 50, a control unit (CPU) 310 that collectively controls each unit and executes a program corresponding to each process, a display communication related information, a camera image, and the like, and receives touches by a user. The display operation unit 320 of the panel, the operation unit 330 including a power switch, the wireless communication unit 340 required to realize various kinds of information communication with the external server via the antenna 341, and the system program or various types of the portable terminal 300 are memorized. A memory unit (ROM) 360 that processes necessary data such as a program and a terminal ID, and various types of processing programs or data executed by the control unit 310, processing data, and imaging data of the imaging device 100 are temporarily stored as work areas. Temporary memory (RAM) 370.

The camera device 100 is in addition to the camera module 50 already described. In addition to the control unit 103, the optical system drive unit 105, the imaging device drive unit 107, the video memory 108, and the like.

The control unit 103 controls each unit of the imaging apparatus 100. control The system 103 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and performs various processes by cooperation with the CPU by various programs developed in the RAM and being developed from the ROM. . Further, the control unit 310 is connected to the control unit 103 of the imaging device 100 to be communicable, and can receive control signals or video data.

The optical system driving unit 105 is controlled by the control unit 103 When focusing, exposure, and the like are performed, the first and second driving mechanisms 55a of the imaging lens 10 are operated to control the state of the imaging lens 10. The optical system driving unit 105 can move the specific lens of the imaging lens 10 along the optical axis AX by operating the driving mechanism 55a, so that the imaging lens 10 can perform the focusing operation.

The imaging element driving unit 107 is controlled by the control unit 103 The operation of the image sensor 51 is controlled while performing exposure or the like. Specifically, the imaging device driving unit 107 controls the imaging element 51 to perform scanning driving based on the timing signal. Further, the imaging device driving unit 107 converts the analog signal of the detection signal or the photoelectric conversion signal output from the imaging device 51 into digital image data. Then, the image sensor driving unit 107 performs various kinds of image processing such as distortion correction, color correction, and compression on the image signal detected by the image sensor 51.

Image memory 108, which is a digital image that has been digitized The number is received from the image sensor driving unit 107 and stored as image data that can be read and written.

Here, the portable type including the above-described image pickup apparatus 100 will be described. The photographing action of the terminal 300. When the portable terminal 300 is set to a camera mode that operates with a camera, subject monitoring (perspective image display) and image capturing are performed. During the monitoring, the image of the subject obtained through the imaging lens 10 is imaged on the imaging surface I of the imaging element 51 (see FIG. 1). The image sensor 51 is scanned and driven by the image sensor driving unit 107, and outputs an analog signal as a photoelectric conversion output corresponding to the imaged light image every predetermined period.

The analog signal is a circuit attached to the imaging element 51 In the case, the gains are appropriately adjusted according to the respective primary color components of RGB, and then converted into digital data. The digital data is subjected to color processing including screen interpolation processing and Y correction processing, and a luminance signal Y and a color difference signal Cb and Cr (image data) of a digital value are generated and stored in the image memory 108. The stored digital data is periodically read from the image memory 108 to generate a video signal, and is output to the display operation unit 320 via the control unit 103 and the control unit 310.

The display operation unit 320 is a finder window during monitoring. The function will instantly display the camera image. In this state, the focus, exposure, and the like of the imaging lens 10 are set by the driving of the optical system driving unit 105 at any time based on the operation input by the user through the display operation unit 320.

In this monitoring state, the user is exposed by appropriate operation. The operation unit 320 can display still image data. Corresponding to the display operation The content of the operation of the unit 320 is read by the image data of the one frame stored in the image memory 108, and is compressed by the image sensor driving unit 107. The compressed video data is recorded, for example, by the control unit 103 and the control unit 310, for example, in the RAM 370 or the like.

Further, the imaging device 100 described above is an example of an imaging device suitable for the present invention, and the present invention is not limited thereto.

In other words, the camera device equipped with the camera module 50 or the imaging lens 10 is not limited to being embedded in the smart phone type portable terminal 300, and may be incorporated in a mobile phone or a PHS (Personal Handyphone System). Etc., it can also be embedded in PDA (Personal Digital Assistant), tablet PC, mobile PC, digital still camera, video camera, etc.

Hereinafter, the imaging lens 10 according to an embodiment of the present invention will be described in detail with reference to FIG. 1 and the like. In the imaging lens 10 shown in FIG. 1, the subject image is formed on the imaging surface (projected surface) I of the imaging element 51, and the first lens L1 having the convex surface facing the object side is sequentially provided from the object side. The negative second lens L2, the third lens L3, the fourth lens L4, and the concave fifth surface L5 in the vicinity of the optical axis AX face the negative fifth lens L5 on the image side. In the above-described imaging lens 10, the image side surface S52 of the fifth lens L5 is aspherical and has an inflection point P in the effective diameter. Further, in the second lens L2, the absolute value of the radius of curvature of the image side surface S22 is smaller than the absolute value of the radius of curvature of the object side surface S21. The image side surface S22 of the second lens L2 is at the effective diameter position of the upper end, and is inclined toward the image side. The image side surface S32 of the third lens L3 has an inflection point P, and part or all of the effective diameter of 70% or more has a negative optical focus. degree. The imaging lens 10 has an aperture stop AS on the object side of the third lens L3, and the aperture aperture 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 aperture FS3 between the third lens L3 and the fourth lens L4, and a fourth light-shielding aperture FS4 between the fourth lens L4 and the fifth lens L5, and is illustrated in the illustrated example. The first light-shielding aperture FS1 is provided between the first lens L1 and the second lens L2, and the second light-shielding aperture FS2 is provided between the second lens L2 and the third lens L3.

According to the above-described imaging lens 10, the object of the first lens L1 The body side surface S11 is convex, which is advantageous for shortening the optical full length. Moreover, by arranging a negative lens in the second lens L2, the effect of correcting chromatic aberration can be improved. Then, by designing the image side surface S52 of the fifth lens L5 to be concave, it is possible to easily ensure the desired back focus which is required when the AF mechanism or the like is disposed. Then, by designing the image side surface S52 of the fifth lens L5 as an aspherical surface having an inflection point P in the effective diameter, the incident angle at which the peripheral image height light LA is incident on the image plane can be suppressed to be small. The light receiving efficiency of 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 than the second lens L2), the exit pupil can be moved away from the image plane, so that the incident surface I can be incident. The angle suppression is small.

Further, in the above-described imaging lens 10, the light-shielding apertures FS3 and FS4 are disposed between the third and fourth lenses L3 and L4 and between the fourth and fifth lenses L4 and L5 to prevent stray light.

The imaging lens 10 of the present embodiment is such that the value dΦ is The diameter of the fourth light-shielding aperture FS4 between the fourth and fifth lenses L4 and L5 (the inner diameter of the opening portion) and the diameter of the third light-shielding aperture FS3 between the third and fourth lenses L3 and L4 (within the opening portion) The difference in the diameter is such that the value dz is the interval between the fourth light-shielding aperture FS4 between the fourth and fifth lenses L4 and L5 and the optical axis AX direction of the third light-shielding aperture FS3 between the third and fourth lenses L3 and L4. The value et6 is the distance between the effective diameter position of the image side surface S32 of the third lens L3 and the optical axis direction of the effective surface position of the object side surface S31 of the fourth lens L4, and the value f is the focal length of the entire imaging lens 10, and the value is 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, and satisfies the following three conditional expressions (1), (2), and (3): 0.75 < dΦ/ Dz<2.5...(1)

0.03<et6/f<0.10...(2)

40< θ S7<80...(3).

According to the above-described imaging lens 10, the value dΦ/dz corresponding to the inclination of the inner diameter of the third light-shielding aperture FS3 to the fourth light-shielding aperture FS4 is exceeded by the lower limit of the conditional expression (1). The diameter of the third light-shielding aperture FS3 is small with respect to the aperture of the fourth light-shielding aperture FS4, and the fourth lens can be sufficiently shielded even for light having a large angle with respect to the optical axis AX emitted from the third lens L3. The flange portion 39 of L4 can prevent stray light caused by light incident on the flange portion 39 of the fourth lens L4. On the other hand, when the value dΦ/dz is lower than the upper limit of the conditional expression (1), the diameter of the fourth light-shielding aperture FS4 is not excessively large with respect to the aperture of the third light-shielding aperture FS3, so that the fifth lens L5 can be sufficiently shielded. The flange portion 39 prevents the light from entering the fifth through Stray light caused by the flange portion 39 of the mirror L5.

Further, the value dΦ/dz of the conditional expression (1) is preferably set within the range of the conditional expression (1') to be described below.

0.90<dΦ/dz<2.0...(1’)

Further, according to the imaging lens 10 of the present embodiment, the value et6/f of the conditional expression (2) for the interval between the third lens L3 and the fourth lens L4 exceeds the lower limit, and the third lens L3 and the fourth lens are used. The interval around the third light-shielding aperture FS3 can be ensured by the periphery of the lens L4. On the other hand, by lowering the value of et6/f below the upper limit of the conditional expression (2), it is possible to prevent the short between the two lenses L3 and L4 from being excessively wide.

Further, the value et6/f of the conditional expression (2) is preferably set within the range of the conditional expression (2') to be described below.

0.05<et6/f<0.08...(2’)

Further, according to the imaging lens 10 of the present embodiment, the value θS7 of the conditional expression (3) regarding the slope of the outer edge of the object side surface S41 of the fourth lens L4 exceeds the lower limit, and is refracted by the third lens L3. The light having a large angle to the optical axis AX is designed to be close to the vertical plane angle, whereby the angle of refraction on the object side surface S41 can be suppressed to be small, so that generation of comet aberration or the like can be suppressed. On the other hand, by lowering the value θS7 below the upper limit of the conditional expression (3), it is possible to prevent the formability from being impeded because the surface angle of the object side surface S41 is excessively large.

Further, the value θS7 of the conditional expression (3) is preferably set within the range of the conditional expression (3') to be described below.

50< θ S7<75...(3')

Here, when the optical surface of the lens is subjected to the vapor deposition method to apply the anti-reflection film, the film thickness is thinned in a place where the surface angle is large, which is a general phenomenon. . Since the film thickness is thinner, the transmittance wavelength characteristic shifts toward the shorter wavelength side than the designed film thickness, and therefore the reflectance of the light on the long wavelength side of the wavelength band originally intended to obtain the reflection preventing effect increases. Therefore, if the surface angle of the effective side diameter of the object side surface S41 of the fourth lens L4 is made large in order to satisfy the conditional expression (4), a premature phenomenon occurs and the desired transmittance wavelength cannot be obtained in the peripheral portion of the lens. characteristic. Therefore, in some cases, only the anti-reflection film of the object side surface S41 of the fourth lens L4 is designed to be different from the anti-reflection film of the other optical surface of the imaging lens 10. For example, the anti-reflection film of the object side surface S41 of the fourth lens L4 is designed such that the angle θ with respect to the optical axis AX is 0 degrees and the reflectance of the incident light is in the range of 420 to 750 nm. It becomes 1.5% or less, and the anti-reflection film of the other optical surface is designed such that the angle θ with the optical axis AX is 0 degree and the reflectance of the incident light becomes 1 in the wavelength band of 420 to 650 nm. %the following.

The imaging lens 10 of the present embodiment has the value dΦ as the diameter of the fourth light-shielding aperture FS4 between the fourth and fifth lenses L4 and L5 and the third and fourth lenses L3 and L4. The difference in diameter between the third light-shielding apertures FS3 is such that the value dz is the fourth light-shielding aperture FS4 between the fourth and fifth lenses L4 and L5, and the third light-shielding aperture FS3 between the third and fourth lenses L3 and L4. Interval, but to meet the following conditions Formula (4).

1.2<dΦ/dz<2.5...(4)

According to the above-described imaging lens 10, the value dΦ/dz corresponding to the inclination of the inner diameter of the third light-shielding aperture FS3 to the fourth light-shielding aperture FS4 is exceeded by the lower limit of the conditional expression (4). The diameter of the third light-shielding aperture FS3 is small with respect to the aperture of the fourth light-shielding aperture FS4, and the fourth lens L4 can be sufficiently shielded even for light having a large angle with respect to the optical axis emitted from the third lens L3. The flange portion 39 can prevent stray light caused by light incident on the flange portion 39 of the fourth lens L4. On the other hand, when the value dΦ/dz is lower than the upper limit of the conditional expression (4), the diameter of the fourth light-shielding aperture FS4 is not excessively large with respect to the aperture of the third light-shielding aperture FS3, so that the fifth lens L5 can be sufficiently shielded. The flange portion 39 prevents stray light caused by light incident on the flange portion 39 of the fifth lens L5.

Further, the value dΦ/dz of the conditional expression (4) is preferably set within the range of the conditional expression (4') to be described below.

1.35<dΦ/dz<1.8...(4’)

In the imaging lens 10 of the present embodiment, in addition to the conditional expressions (1) to (3) and (4) above, the object side surface of the fourth lens is an aspherical shape, and satisfies the conditional expression (5) already described. ).

0.015<AS7/f<0.07...(5)

The value AS7 is the aspherical shape of the object side surface S41 of the fourth lens L4 and the effective diameter position of the object side surface S41 of the fourth lens L4. The spherical shape SP (see FIG. 5) connected to the center point has the largest deviation amount (mm) in the optical axis direction, and the value f is the focal length of the entire imaging lens 10.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (5').

0.02<AS7/f<0.05...(5’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (6) already described in addition to the conditional expressions (1) to (3) and (4) above.

| Sag6 |/f<0.10...(6)

Here, the value |Sag6| is the maximum value of the amount of depression of the image side surface S32 of the third lens L3.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (6').

| Sag6 |/f<0.05...(6’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (7) already described in addition to the conditional expressions (1) to (3) and (4) above.

-15< θ S6<15...(7)

Here, the value θS6 is the maximum surface angle (°) at which the effective diameter of the image side surface S32 of the third lens L3 is 90% or more.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (7').

-10< θ S6<10...(7')

The imaging lens 10 of the present embodiment satisfies the conditional expression (8) already described in addition to the conditional expressions (1) to (3) and (4) above.

0.65<| Sag7 |/d7<1.50...(8)

Here, the value |Sag7| is the maximum value of the recess 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.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (8').

0.75<| Sag7 |/d7<1.30...(8’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (9) already described in addition to the conditional expressions (1) to (3) and (4) above.

0.45< θ r6/ θ r4<1.00...(9)

Here, the value θr4 is a refraction angle of the peripheral ray LA2 on the image side surface S22 of the second lens L2 on the image side surface S22 that is farther from the optical axis AX, and the value θr6 is on the image side surface S32 of the third lens L3. The diagonal angle of the high-beam beam is the angle of refraction of the peripheral ray LA2 farther from the optical axis AX.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (9').

0.50< θ r6/ θ r4<0.90...(9')

The imaging lens 10 of the present embodiment is free from the above conditions. In addition to the formulas (1) to (3) and (4), the conditional expression (10) which has been described is also satisfied.

0.05<et8/f<0.20...(10)

Here, the value et8 is the interval between the effective diameter position of the image side surface S42 of the fourth lens L4 and the optical axis AX direction of the effective diameter position of the image side surface S42 of the fifth lens L5.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (10').

0.07<et8/f<0.15...(10’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (11) already described in addition to the conditional expressions (1) to (3) and (4) above.

45<v5<70...(11)

Here, the value v5 is the Abbe number of the fifth lens L5.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (11').

50<v5<60...(11’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (12) already described in addition to the conditional expressions (1) to (3) and (4) above.

1.45<n1<1.65...(12)

Here, the value n1 is the refractive index of the first lens L1.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (12').

1.50<n1<1.60...(12’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (13) already described in addition to the conditional expressions (1) to (3) and (4) above.

15<v2<30...(13)

Here, the value v2 is the Abbe number of the second lens L2.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (13').

20<v2<25...(13’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (14) which has been described in addition to the conditional expression (1) above.

-0.2<f/f4<2.0...(14)

Here, the value f4 is the focal length of the fourth lens L4.

The imaging lens 10 of the present embodiment satisfies the conditional expression (15) already described, except for the conditional expression (1) above.

1.1<f123/f<1.7...(15)

Here, the value f123 is a combined focal length of the first lens L1 to the third lens L3.

The imaging lens 10 of the present embodiment may have a lens having substantially no power, although not specifically shown.

[Examples]

Hereinafter, a specific embodiment of the imaging lens according to the present invention will be described. In each of the embodiments, r is the radius of curvature, d is the interval above the axis, nd is the refractive index of the lens material for the d line, vd is the Abbe number of the lens material, and "eff.dia." is effective. path. In addition, the surface in which "*" is described after each surface number is a surface having an aspherical shape, and the shape of the aspherical surface is the origin of the surface apex, and the X-axis is taken in the optical axis AX direction, and the optical axis is The height of the AX vertical direction is assumed to be h, and is represented by the following "number 1".

Where Ai: i times the aspheric coefficient

R: radius of curvature

K: conic constant

Then, in each of the embodiments, "STO" indicates the aperture stop AS, and "FS" indicates the aperture apertures FS1 to FS4. "OBJ" is an object surface, and "IMG" is an imaging surface or an image surface.

Further, in the imaging lens of each of the embodiments, the basic wavelength system is 587.56 nm, and the unit of the surface shape such as the radius of curvature is mm.

[Example 1]

The data of the lens surface of Example 1 is shown in Table 1 below.

The aspherical coefficients of the lens surface of Example 1 are shown in Table 2 below.

Further, in the following (including the lens data of 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 the first embodiment are listed below.

Here, FL is the focal length of the entire system of the imaging lens, Fno is the F number, w is the diagonal angle, Ymax is the half value of the imaging device facing the angular length, and BF is the back focus. The TL line indicates the full length of the system. Further, the above symbols have the same meanings in the following embodiments.

The single lens data of Example 1 is shown in Table 3 below.

Fig. 6 is a cross-sectional view showing the imaging lens 11 and the like of the first embodiment. The imaging lens 11 is provided with a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a new moon having a negative refractive power around the optical axis AX and having a convex surface facing the object side, from the object (OBJ) side. The second lens L2 having a shape, a third lens L3 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and a crescent shape having a positive refractive power around the optical axis AX and having a convex surface toward the image side The fourth lens L4 has a periphery around the optical axis AX A fifth concave lens L5 having a negative refractive power. All lenses L1~L5 are formed of plastic materials. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1, and light-shielding apertures (FS) FS1 to FS4 are disposed between the lenses L1 to L5. Further, for example, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

7A to 7C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 11 of the first embodiment, and FIGS. 7D and 7E are diagrams showing a meridional comet image of the imaging lens 11 of the first embodiment. difference.

[Example 2]

The data of the lens surface of Example 2 is shown in Table 4 below.

The aspherical coefficients of the lens surface of Example 2 are shown in Table 5 below.

The characteristics of the imaging lens of the second embodiment are listed below.

The single lens data of Example 2 is shown in Table 6 below.

Fig. 8 is a cross-sectional view showing the imaging lens 12 and the like of the second embodiment. The imaging lens 12 is provided with a crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, for example, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

9A to 9C are views showing the image pickup lens 12 of the second embodiment. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 9D and 9E show the meridional coma aberration of the imaging lens 12 of the second embodiment.

[Example 3]

The data of the lens surface of Example 3 is shown in Table 7 below.

The aspherical coefficient of the lens surface of Example 3 is shown in Table 8 below.

The characteristics of the imaging lens of the third embodiment are listed below.

The single lens data of Example 3 is shown in Table 9 below.

Figure 10 is a cross section of the imaging lens 13 and the like of the third embodiment. Figure. The imaging lens 13 is provided, in order from the object side, in a crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. The second lens L2 having a crescent shape in which the convex surface faces the object side, the third lens L3 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a crescent shape around the optical axis AX The fourth lens L4 of the crescent shape having a positive refractive power and having a convex surface facing the image side, and the fifth concave lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

11A to 11C show the image pickup lens 13 of the embodiment 3. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 11D and 11E show the meridional coma aberration of the imaging lens 13 of the third embodiment.

[Example 4]

The data of the lens surface of Example 4 is shown in Table 10 below.

The aspherical coefficient of the lens surface of Example 4 is shown below. Table 11.

The characteristics of the imaging lens of the fourth embodiment are listed below.

The single lens data of Example 4 is shown in Table 12 below.

Figure 12 is a cross section of the imaging lens 14 and the like of the fourth embodiment. Figure. The imaging lens 14 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape, the third lens L3 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and a convex surface toward the image side The fourth lens L4 of the crescent shape has a biconcave fifth lens L5 having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

13A to 13C show the image pickup lens 14 of the embodiment 4. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 13D and 13E show the meridional coma aberration of the imaging lens 14 of the fourth embodiment.

[Example 5]

The data of the lens surface of Example 5 is shown in Table 13 below.

The aspherical coefficient of the lens surface of Example 5 is shown below. Table 14.

The characteristics of the imaging lens of the fifth embodiment are listed below.

The single lens data of Example 5 is shown in Table 15 below.

Figure 14 is a cross section of the imaging lens 15 and the like of the fifth embodiment. Figure. The imaging lens 15 is provided with a first-lens L1 having a positive convex shape having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

15A to 15C show the image pickup lens 15 of the embodiment 5. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 15D and 15E show the meridional coma aberration of the imaging lens 15 of the fifth embodiment.

[Example 6]

The data of the lens surface of Example 6 is shown in Table 16 below.

The aspherical coefficients of the lens surface of Example 6 are shown in Table 17 below.

The characteristics of the imaging lens of the sixth embodiment are listed below.

The single lens data of Example 6 is shown in Table 18 below.

Figure 16 is a cross section of the image pickup lens 16 and the like of the sixth embodiment. Figure. The imaging lens 16 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape, the third lens L3 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and a convex surface toward the image side The fourth lens L4 of the crescent shape has a biconcave fifth lens L5 having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

17A to 17C show the image pickup lens 16 of the embodiment 6. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 17D and 17E show the meridional coma aberration of the imaging lens 16 of the sixth embodiment.

[Example 7]

The data of the lens surface of Example 7 is shown in Table 19 below.

The aspherical coefficient of the lens surface of Example 7 is shown below. Table 20.

The characteristics of the imaging lens of the seventh embodiment are listed below.

The single lens data of Example 7 is shown in Table 21 below.

Figure 18 is a cross section of the imaging lens 17 and the like of the seventh embodiment. Figure. The imaging lens 17 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape, the biconvex third lens L3 having a positive refractive power around the optical axis AX, and the crescent shape having a weak positive refractive power around the optical axis AX and having a convex surface toward the image side The lens L4 has a crescent-shaped fifth lens L5 having a negative refractive power around the optical axis AX and having a convex surface facing the object side. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

19A to 19C show the image pickup lens 17 of the embodiment 7. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 19D and 19E show the meridional coma aberration of the imaging lens 17 of the seventh embodiment.

[Example 8]

The data of the lens surface of Example 8 is shown in Table 22 below.

The aspherical coefficient of the lens surface of Example 8 is shown below. Table 23.

The characteristics of the imaging lens of the eighth embodiment are listed below.

The single lens data of Example 8 is shown in Table 24 below.

Figure 20 is a cross section of the image pickup lens 18 and the like of the eighth embodiment. Figure. The imaging lens 18 is provided, in order from the object side, with a substantially convex crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and having a negative refractive power around the optical axis AX. The second lens L2 having a crescent shape with a convex surface facing the object side, and the third convex lens L3 having a substantially convex double convex shape having a weak positive refractive power around the optical axis AX have positive refractive power around the optical axis AX and convex orientation The fourth lens L4 of the crescent shape on the image side and the fifth lens L5 of the biconcave having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

21A to 21C show the image pickup lens 18 of the embodiment 8. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 21D and 21E show the meridional coma aberration of the imaging lens 18 of the eighth embodiment.

[Example 9]

The data of the lens surface of Example 9 is shown in Table 25 below.

The aspherical coefficient of the lens surface of Example 9 is shown below. Table 26.

The characteristics of the imaging lens of the ninth embodiment are listed below.

The single lens data of Example 9 is shown in Table 27 below.

Figure 22 is a cross section of the imaging lens 19 and the like of the ninth embodiment. Figure. The imaging lens 19 is provided, in order from the object side, in a crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

23A to 23C show the image pickup lens 19 of the ninth embodiment. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 23D and 23E show the meridional coma aberration of the imaging lens 19 of the ninth embodiment.

[Example 10]

The data of the lens surface of Example 10 is shown in Table 28 below.

The aspherical coefficient of the lens surface of Example 10 is shown in Table 29 below.

The characteristics of the imaging lens of the tenth embodiment are listed below.

The single lens data of Example 10 is shown in Table 30 below.

Figure 24 is a cross section of the image pickup lens 20 and the like of the tenth embodiment. Figure. The imaging lens 20 is provided, in order from the object side, with a substantially convex crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and having a negative refractive power around the optical axis AX. The second lens L2 having a crescent shape with a convex surface facing the object side, and the third convex lens L3 having a substantially convex double convex shape having a weak positive refractive power around the optical axis AX have positive refractive power around the optical axis AX and convex orientation The fourth lens L4 of the crescent shape which is approximately convex and convex on the image side, and the fifth lens L5 which has a birefringence of negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

25A to 25C show the image pickup lens 20 of the embodiment 10. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 25D and 25E show the meridional coma aberration of the imaging lens 20 of the tenth embodiment.

[Example 11]

The data of the lens surface of Example 11 is shown in Table 31 below.

The aspherical coefficient of the lens surface of Example 11 is shown below. Table 32.

The characteristics of the imaging lens of the eleventh embodiment are listed below.

The single lens data of Example 11 is shown in Table 33 below.

Figure 26 is a cross section of the imaging lens 21 and the like of the eleventh embodiment. Figure. The imaging lens 21 includes, in order from the object side, a first lens L1 having a positive convex shape having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

27A to 27C show the image pickup lens 21 of the eleventh embodiment. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 27D and 27E show the meridional coma aberration of the imaging lens 21 of the eleventh embodiment.

[Example 12]

The data of the lens surface of Example 12 is shown in Table 34 below.

The aspherical coefficient of the lens surface of Example 12 is shown below. Table 35.

The characteristics of the imaging lens of the twelfth embodiment are listed below.

The single lens data of Example 12 is shown in Table 36 below.

28 is a cross section of the imaging lens 22 and the like of Embodiment 12. Figure. The imaging lens 22 is provided with a crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

29A to 29C show the image pickup lens 22 of the embodiment 12. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 29D and 29E show the meridional coma aberration of the imaging lens 22 of the twelfth embodiment.

[Example 13]

The data of the lens surface of Example 13 is shown in Table 37 below.

The aspherical coefficient of the lens surface of Example 13 is shown below. Table 38.

The characteristics of the imaging lens of the thirteenth embodiment are listed below.

The single lens data of Example 13 is shown in Table 39 below.

Figure 30 is a cross section of the imaging lens 23 and the like of the thirteenth embodiment. Figure. The imaging lens 23 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape, the third lens L3 having a substantially convex double convexity having a weak positive refractive power around the optical axis AX, and the new positive refractive power around the optical axis AX and the convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

31A to 31C show the image pickup lens 23 of the embodiment 13. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 31D and 31E show the meridional coma aberration of the imaging lens 23 of the thirteenth embodiment.

[Example 14]

The data of the lens surface of Example 14 is shown in Table 40 below.

The aspherical coefficient of the lens surface of Example 14 is shown below. Table 41.

The characteristics of the imaging lens of the fourteenth embodiment are listed below.

The single lens data of Example 14 is shown in Table 42 below.

Figure 32 is a cross section of the image pickup lens 24 and the like of the fourteenth embodiment. Figure. The imaging lens 24 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape has a weak positive refractive power around the optical axis AX and is slightly flat, and only the third lens L3 having a crescent-shaped surface facing the object side has a weak periphery around the optical axis AX. The fourth lens L4 having a negative refractive power and having a convex surface facing the image side, and a fifth lens L5 having a weak negative refractive power around the optical axis AX and having a convex surface facing the object side. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

33A to 33C show the image pickup lens 24 of the embodiment 14. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 33D and 33E show the meridional coma aberration of the imaging lens 24 of the fourteenth embodiment.

[Example 15]

The data of the lens surface of Example 15 is shown in Table 43 below.

The aspherical coefficients of the lens faces of Example 15 are shown in Table 44 below.

The characteristics of the imaging lens of the fifteenth embodiment are listed below.

The single lens data of Example 15 is shown in Table 45 below.

Figure 34 is a cross section of the image pickup lens 25 and the like of the fifteenth embodiment. Figure. The imaging lens 25 is provided with a first lens L1 having a positive refractive power and a substantially convex double convex shape around the optical axis AX, and a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2 of the moon shape, the third lens L3 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and the new moon having a positive refractive power around the optical axis AX and having a convex surface toward the image side The fourth lens L4 having a shape and a biconcave lens L5 having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. An aperture stop AS is disposed between the first lens L1 and the second lens L2. The light-shielding aperture FS1 is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS2 to FS4 are disposed between the lenses L2 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

35A to 35C show the image pickup lens 25 of the fifteenth embodiment. Each of the aberration diagrams (spherical aberration, astigmatism, and distortion aberration), FIGS. 35D and 35E show the meridional coma aberration of the imaging lens 25 of the fifteenth embodiment.

[Example 16]

The data of the lens surface of Example 16 is shown in Table 46 below.

The aspherical coefficient of the lens surface of Example 16 is shown below. Table 47.

The characteristics of the imaging lens of the sixteenth embodiment are listed below.

The single lens data of Example 16 is shown in Table 48 below.

Figure 36 is a cross section of the image pickup lens 26 and the like of the sixteenth embodiment. Figure. The imaging lens 26 is provided with a first lens L1 having a positive refractive power and a substantially convex double convexity around the optical axis AX, and a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2 of the moon shape, the third lens L3 having a weak positive refractive power around the optical axis AX and having a convex surface facing the object side, and the new moon having a positive refractive power around the optical axis AX and having a convex surface toward the image side The fourth lens L4 having a shape and a biconcave lens L5 having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. An aperture stop AS is disposed between the first lens L1 and the second lens L2. The light-shielding aperture FS1 is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS2 to FS4 are disposed between the lenses L2 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

37A to 37C show the image pickup lens 26 of the embodiment 16. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 37D and 37E show the meridional coma aberration of the imaging lens 26 of the sixteenth embodiment.

[Example 17]

The data of the lens surface of Example 17 is shown in Table 49 below.

The aspherical coefficient of the lens surface of Example 17 is shown below. Table 50.

The characteristics of the imaging lens of Example 17 are listed below.

The single lens data of Example 17 is shown in Table 51 below.

38 is a cross section of the imaging lens 27 and the like of Embodiment 17. Figure. The imaging lens 27 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape, the approximately convex double convex L3 having a weak positive refractive power around the optical axis AX, and the new positive refractive power around the optical axis AX and the convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

39A to 39C show the image pickup lens 27 of the embodiment 17. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 39D and 39E show the meridional coma aberration of the imaging lens 27 of the seventeenth embodiment.

[Example 18]

The data of the lens surface of Example 18 is shown in Table 52 below.

The aspherical coefficient of the lens surface of Example 18 is shown below. Table 53.

The characteristics of the imaging lens of Example 18 are listed below.

The single lens data of Example 18 is shown in Table 54 below.

40 is a cross section of the imaging lens 28 and the like of Embodiment 18. Figure. The imaging lens 28 is provided with a crescent-shaped 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 and a convex surface facing the object side. The second lens L2 of the crescent shape, the third lens L3 having a substantially convex double convexity having a weak positive refractive power around the optical axis AX, and the new positive refractive power around the optical axis AX and the convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

41A to 41C show the image pickup lens 28 of the embodiment 18. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 41D and 41E show the meridional coma aberration of the imaging lens 28 of the eighteenth embodiment.

[Example 19]

The data of the lens surface of Example 19 is shown in Table 55 below.

The aspherical coefficient of the lens surface of Example 19 is shown in Table 56 below.

The characteristics of the imaging lens of Example 19 are listed below.

The single lens data of Example 19 is shown in Table 57 below.

Figure 42 is a cross section of the image pickup lens 29 and the like of Embodiment 19. Figure. The imaging lens 29 is provided, in order from the object side, with a substantially convex crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

43A to 43C show the image pickup lens 29 of the embodiment 19. The aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of FIGS. 43D and 43E show the meridional coma aberration of the imaging lens 29 of the nineteenth embodiment.

[Example 20]

The data of the lens surface of Example 20 is shown in Table 58 below.

The aspherical coefficients of the lens faces of Example 20 are shown in Table 59 below.

The characteristics of the imaging lens of Example 20 are listed below.

The single lens data of Example 20 is shown in Table 60 below.

Figure 44 is a cross section of the imaging lens 30 and the like of Embodiment 20. Figure. The imaging lens 30 is provided, in order from the object side, in a crescent-shaped first lens L1 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and having a negative refractive power around the optical axis AX. a crescent-shaped second 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 new positive refractive power around the optical axis AX and a convex surface facing the image side The fourth lens L4 of the moon shape and the fifth lens L5 having a birefringent force having a negative refractive power around the optical axis AX. All lenses L1~L5 are formed of plastic materials. The aperture stop AS is disposed on the object side of the outer edge of the first lens L1, and the light-shielding apertures FS1 to FS4 are disposed between the lenses L1 to L5. Further, a parallel flat plate (not shown) having an appropriate thickness may be disposed between the light incident surface of the first lens L1 and the object.

45A to 45C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 30 of Example 20, and FIGS. 45D and 45E are diagrams showing a meridional comet image of the imaging lens 30 of Example 20. difference.

The following Table 61 is for reference, and the values of the respective Examples 1 to 20 corresponding to the conditional expressions (1) to (15) are arranged.

The above description is based on the embodiment or the embodiment. However, the present invention is not limited to the above embodiment and the like. For example, the light-shielding apertures FS1 to FS4 are not limited to metal plates, but may be resin or ceramic plates. The member may be formed by coating the flange portion 39 of the lens with a light-shielding material. In addition, the light-shielding apertures FS1 to FS4 are not limited to a complete light-shielding body, and may be a person who performs light reduction outside the aperture. When the light-shielding apertures FS1 to FS4 are a light shielding plate or the like, a plurality of light shielding plates or the like may be disposed between the pair of lenses.

10‧‧‧ camera lens

50‧‧‧ camera module

51‧‧‧Photographic components

51a‧‧‧Photoelectric Conversion Department

52‧‧‧Wiring substrate

54‧‧‧Mirror tube

55a‧‧‧Drive mechanism

AS‧‧‧ aperture

AX‧‧‧ optical axis

FS1~FS4‧‧‧shading aperture

I‧‧‧ imaging surface

L1‧‧‧1st lens

L2‧‧‧2nd lens

L3‧‧‧3rd lens

L4‧‧‧4th lens

L5‧‧‧5th lens

LA‧‧‧Light

P‧‧‧reflexion point

S11, S21, S22, S31, S32, S41, S42, S51, S52‧‧‧ lens surface

F‧‧‧parallel plate

Claims (21)

An imaging lens is formed by a positive first lens, a second lens, a third lens, a fourth lens, and a fifth lens having a concave surface facing the image side from the object side; The image side surface of the lens is aspherical and has an inflection point in the effective diameter; at least one of the second lens and the third lens is a negative lens; the aperture is closer to the object side than the third lens; Between the third lens and the fourth lens, and between the fourth lens and the fifth lens, there is a light-shielding aperture; and the following conditional formulas (1), (2), and (3): 0.75 <dΦ/ Dz<2.5 (1) 0.03<et6/f<0.10 (2) 40< θ S7<80 (3) where dΦ: the inner diameter of the opening portion of the light-shielding aperture between the fourth and fifth lenses, The difference dz between the inner diameters of the opening portions of the light-shielding apertures between the third and fourth lenses is as follows: the light-shielding aperture between the fourth and fifth lenses and the optical axis direction of the light-shielding aperture between the third and fourth lenses The interval et6: the distance between the effective diameter position of the image side surface of the third lens and the optical axis direction of the effective diameter position of the object side of the fourth lens. : Focal length θS7 of the entire imaging lens: The maximum surface angle (°) at which the effective diameter 7 of the object side surface of the fourth lens is equal to or greater than the above. An imaging lens is formed by a positive first lens, a second lens, a third lens, a fourth lens, and a fifth lens having a concave surface facing the image side from the object side; The image side surface of the lens is aspherical and has an inflection point in the effective diameter; at least one of the second lens and the third lens is a negative lens; the aperture is closer to the object side than the third lens; The third lens and the front fourth lens, and the front fourth lens and the front fifth lens have a light-shielding aperture; the front side of the fourth lens has an aspherical shape and satisfies the following conditional expression (4): 1.2<dΦ/dz<2.5 (4) where dΦ is the inner diameter of the opening portion of the light-shielding aperture between the fourth and fifth lenses, and the opening portion of the light-shielding aperture between the third and fourth lenses. The difference dz in the diameter is the distance between the light-shielding aperture between the fourth and fifth lenses and the optical axis direction of the light-shielding aperture between the third and fourth lenses. The camera lens as recited in claim 1 or 2, wherein The object side surface of the fourth lens has an aspherical shape and satisfies the conditional expression (5): 0.015 < AS7 / f < 0.07 (5) wherein AS7: the aspherical shape of the object side surface of the fourth lens, and the former 4 The effective diameter of the lens and the maximum amount of separation (mm) of the spherical shape formed by the center point. The imaging lens according to any one of claims 1 to 3, wherein the aperture aperture is closer to the object side than the second lens. The imaging lens according to any one of claims 1 to 4, wherein the conditional expression (6) is satisfied: | Sag6 | / f < 0.10 (6), wherein |Sag6|: the front side of the image side of the third lens The maximum amount of depression. The imaging lens according to any one of claims 1 to 5, wherein the conditional expression (7) is satisfied: -15 < θ S6 < 15 (7), wherein θS6: an effective diameter of the image side surface of the third lens The maximum face angle (°) at 90% or more. The imaging lens according to any one of claims 1 to 6, wherein the conditional expression (8) is satisfied: 0.65<| Sag7 |/d7<1.50 (8) where |Sag7|: the maximum amount of depression of the object side surface of the fourth lens is d7: the center thickness of the fourth lens. The imaging lens according to any one of claims 1 to 7, wherein the conditional expression (9) is satisfied: 0.45 < θ r6 / θ r4 < 1.00 (9), wherein θr4: on the image side surface of the second lens The angle of refraction of the peripheral ray of the diagonal image of the high beam from the far side of the optical axis is θr6: the angle of refraction of the peripheral ray of the diagonal image on the image side of the third lens from the far side of the optical axis. The imaging lens according to any one of claims 1 to 8, wherein the conditional expression (10) is satisfied: 0.05 < et 8 / f < 0.20 (10), wherein et8: an effective diameter of the image side of the fourth lens The position is spaced from the optical axis direction of the effective diameter position of the object side of the fifth lens. The imaging lens according to any one of claims 1 to 9, wherein the fifth lens is a negative lens and satisfies the conditional expression (11); 45 < v5 < 70 (11) V5: The Abbe number of the fifth lens. The imaging lens according to any one of claims 1 to 10, wherein the conditional expression (11) is satisfied: 1.45 < n1 < 1.65 (12), wherein n1: the refractive index of the first lens is preceded. The imaging lens according to any one of claims 1 to 11, wherein the second lens is a negative lens. The imaging lens according to claim 12, wherein the second lens is such that the absolute value of the curvature radius of the image side surface is 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 13, wherein the image side surface of the second lens is such that a part or all of the effective diameter of 70% or more has a negative refractive power. The imaging lens according to claim 12, wherein the conditional expression (13): 15 < v2 < 30 (13) is satisfied, wherein v2: the Abbe number of the second lens. The imaging lens according to any one of claims 1 to 15, wherein the conditional expression (14) is satisfied: -0.2 < f / f4 < 2.0 (14) f4: the focal length of the fourth lens is described. The imaging lens according to any one of claims 1 to 16, wherein the conditional expression (15): 1.1 < f123 / f < 1.7 (15) f123: the synthesis of the first lens to the third lens before the third lens is satisfied focal length. The imaging lens according to any one of claims 1 to 17, wherein the front aperture is closer to the object than the second lens, and the second and fifth lenses are negative lenses, and satisfy the conditional expression (14). ): -0.2<f/f4<2.0...(14). The imaging lens according to any one of claims 1 to 18, further comprising: a lens having substantially no power. An imaging device comprising the imaging lens according to any one of claims 1 to 19, and an imaging element. A portable terminal is provided with the imaging device described in claim 20.