TWM472861U - Image pickup lens, image pickup apparatus, and portable terminal - Google Patents

Description

Camera lens, camera device and portable terminal

This creation is a small camera lens, a camera device, and a portable terminal for suppressing stray light. This creation is particularly related to an imaging lens, a camera device, and a portable terminal having five lenses 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 the stray light, a five-piece imaging lens having a light-shielding aperture in addition to the aperture stop is sequentially provided with a first lens, a second lens, and a third lens having positive refractive power from the object side. The fourth lens is composed of a fifth lens having at least one surface of an aspherical surface having an inflection point, and includes a light-shielding aperture fixed between the first lens and the third lens, and is fixed to the third lens to the fifth lens. An imaging lens of a light-shielding aperture between lenses has been disclosed (refer to Patent Document 2).

However, in the imaging lens described in Patent Document 2, the shape of the image side surface of the third lens is a convex surface having no near inflection point, and in the case of a short back, the divergence of the peripheral light of the light beam imaged at the peripheral image height is only The concave surface that is given to the second lens is responsible for a large aberration due to strong refraction, and it is difficult to achieve high performance.

[Previous Technical Literature] [Patent Literature]

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

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

The present invention has been developed in view of the above problems in the background art, and aims to provide an imaging lens comprising five pieces which are smaller than the prior type, have less stray light, and are excellently corrected for various aberrations.

Here, the scale of the small-sized imaging lens, in the present invention, aims to achieve a miniaturization that satisfies the following degree. By satisfying this range, the entire imaging device can be miniaturized.

L/2Y<0.90 (15) 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, when a parallel plate such as an optical low-pass filter, an infrared cut filter, or a cover glass of an image sensor package is disposed between the image-side surface of the image pickup lens and the image-side focus position, Next, the parallel 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...(15’)

In order to achieve the above objective, the imaging lens of the present invention is composed of a positive first lens, a second lens, a third lens, a fourth lens, and a concave surface facing the image side from the object side. 5 lens formed; the image side 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; the aperture of the aperture is closer to the object than the third lens a side having a light-shielding aperture between the third lens and the fourth lens and between the fourth lens and the fifth lens; the image side surface of the third lens having an inflection point and having an effective diameter of 70% or more Some or all of them have negative power.

In the imaging lens of the present invention, the first lens has a convex surface facing the object side, whereby the position of the main point of the whole system is close to the object side, which is advantageous for shortening the optical total length. Further, since the back side focus can be extended by designing the image side surface of the fifth lens to be concave, it is possible to secure a desired rear focus which is required when the AF mechanism or the like is disposed. 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 as described in the present invention is made to be short-cut, the positive power is concentrated on the lens on the object side among the five lenses, thereby bringing the main point of the whole system closer. On the object side, it is even necessary to shorten the interval between the lenses so that the area occupied by the lens becomes small. In addition, if the diameter is large, the convex surface on the object side of the first lens will be generated. Large spherical aberration, so 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 the short-back is continued, the light incident on the image pickup lens at an angle larger than the maximum angle of incidence is a large angle between the optical axis and the fourth lens. Stray light is easily generated outside the effective diameter of the lens or the fifth lens.

Therefore, in the first imaging lens, stray light can be avoided by arranging a light-shielding aperture between the third and fourth lenses and between the fourth and fifth lenses. Further, by causing the image side surface of the third lens to be inclined toward the image side at the effective diameter position, the peripheral light of the light beam formed at the maximum image height is diverged on the image side surface of the third lens, so that the third pass can be easily passed. The light behind the lens has a large angle to the optical axis, which is beneficial to the short back.

Further, the image side surface of the third lens has an inflection point, and a part or all of the effective diameter of 70% or more has a negative refractive power. Here, the term "70% or more of the effective diameter" means a band-shaped field from the boundary of 70% of the effective diameter to the outer edge of the effective diameter. The so-called negative power means that when parallel rays are incident, the light is refracted away from the optical axis. In a portion of the effective path, in the case where the parallel rays are refracted away from the optical axis, a part of the face is said to have a negative power. As described above, by making a part or all of the effective diameter of the third lens having a negative refractive power, the peripheral light of the light beam formed at the maximum image height is diverged on the image side surface of the third lens. It is easy to make the light after passing through the third lens The shaft has a large angle and is therefore advantageous for short streaking.

Here, in the case of the object side surface of the first lens or the image side surface of the fifth lens, when the effective diameter 5 is stopped, only the term of R is fitted by the least square method, and the center of curvature is defined as the air side. Then concave, if it is the media side, it is convex. 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, according to the specific aspect of the present creation, the aperture stop can be disposed closer to the object side than the second lens.

In another aspect of the present invention, the conditional expression (2) is satisfied: 0.75 < dΦ / dz < 2.5 (2) wherein dΦ: the inner diameter of the opening portion of the light-shielding aperture between the fourth and fifth lenses, and Difference in 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 direction of the light-shielding aperture between the third and fourth lenses.

By setting the light-shielding aperture I between the third and fourth lenses and the light-shielding aperture II between the fourth and fifth lenses to satisfy the conditional expression (2), stray light can be avoided. By exceeding the lower limit of the value dΦ/dz of the conditional expression (2), the aperture of the light-shielding aperture I between the third and fourth lenses is small with respect to the aperture of the light-shielding aperture II between the fourth and fifth lenses, even if For a light that is emitted from the third lens and has a large angle to the optical axis, Since the flange portion of the fourth lens can be sufficiently shielded from light, it is possible to prevent stray light caused by light incident on the flange portion of the fourth lens. On the other hand, by making the value dΦ/dz lower than the upper limit of the conditional expression (2), the aperture of the light-shielding aperture II between the fourth and fifth lenses with respect to the aperture of the light-shielding aperture I between the third and fourth lenses Since it is not excessively large, the flange portion of the fifth lens can be sufficiently shielded from light, and stray light caused by light incident on the flange portion of the fifth lens can be prevented.

Further, the value dΦ/dz is preferably a range of any one of the following formulas.

1.2<dΦ/dz<2.5...(2’)

0.90<dΦ/dz<2.0...(2")

In another aspect of the present invention, the conditional expression (3) is satisfied: 0.03 < et6/f<0.10 (3) wherein et6: the effective diameter position of the image side of the third lens and the object side of the fourth lens The interval of the optical axis direction of the effective path position

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

By exceeding the lower limit of the value et6/f of the conditional expression (3), the interval for inserting the light-shielding aperture I can be ensured around the third lens and the fourth lens. On the other hand, by making the value et6/f lower than the upper limit of the conditional expression (3), it is possible to prevent the short-back 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...(3’)

In still another aspect of the present invention, the conditional expression (4) is satisfied: 40< θ S7<80 (4) where θ S7: the maximum surface angle of the effective side of the object side of the fourth lens is greater than or equal to (°° ).

By exceeding the lower limit of the value θ S7 of the conditional expression (4), the light refracted by the third lens and having a large angle to the optical axis is designed to be close to the vertical plane angle, whereby the refraction angle can be suppressed to It is small, so it can suppress the occurrence of comet aberrations and the like. On the other hand, by lowering the value θ S7 below the upper limit of the conditional expression (4), it is possible to prevent the formability from being impaired because the surface angle is excessively large.

Further, regarding the value θ S7 , a range of the following formula is preferable.

50< θ S7<75...(4')

In still another aspect of the present invention, the conditional expression (5) is satisfied: | Sag6 | / f < 0.10 (5) 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 (5), 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 to be in the range of the following formula.

| Sag6 |/f<0.05...(5’)

In still another aspect of the present invention, the conditional expression (6) is satisfied: -15< θ S6<15 (6), wherein θ S6 : 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 θ S6 by satisfying the range of the conditional expression (6), the peripheral ray of the light beam imaged at the peripheral image height can be refracted by the divergence, so that the third lens can be easily made to the optical axis after passing A larger angle is conducive to short stature.

Further, regarding the value θ S6 , a range of the following formula is preferable.

-10< θ S6<10...(6')

In still another aspect of the present invention, the conditional expression (7) is satisfied: 0.65<| Sag7 |/d7<1.50 (7) where | Sag7 |: the maximum amount of depression of the object side of the fourth lens

D7: The center thickness of the fourth lens.

By exceeding the lower limit of the value | Sag7 |/d7 of the conditional expression (7), 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 making the value | Sag7 | / d7 lower than the conditional expression (7) The upper limit of the fourth lens is not excessively large on the side of the object, and is effective for the low-profile.

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

0.75<| Sag7 |/d7<1.30...(7’)

In still another aspect of the present invention, the conditional expression (8) is satisfied: 0.45 < θ r6 / θ r4 < 1.00 (8) where θ r4: the diagonal image beam on the image side of the second lens is off Refraction angle of the peripheral ray on the far side of the optical axis

θ r6: the angle of refraction of the peripheral ray of the diagonal image high beam on the image side of the third lens from the far side of the optical axis.

By exceeding the lower limit of the value θ r6 / θr4 of the conditional expression (8), 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. small. On the other hand, by lowering the value θ r6 / θr4 below the upper limit of the conditional expression (8), it is possible to prevent the light ray divergence of the third lens from being excessively strong and causing aberration.

Further, regarding the value θ r6 / θ r4 , a range of the following formula is preferable.

0.50< θ r6/ θ r4<0.90...(8')

In still another aspect of the creation, the conditional formula (9) is satisfied: 0.05 < et 8 / f < 0.20 (9) wherein Et8: the distance between the effective diameter position of the image side surface of the fourth lens and the optical axis direction of the effective diameter position of the object side surface of the fifth lens.

By exceeding the lower limit of the value et8/f of the conditional expression (9), it is possible to ensure a gap for the light-shielding aperture II to be placed around the fourth lens and the fifth lens, by setting the value et8/f lower than the conditional expression (9). 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...(9’)

In still another aspect of the present invention, the fifth lens is a negative lens and satisfies the conditional expression (10): 45 < v5 < 70 (10), 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, and therefore it is possible to reduce the influence of dust or scratch on the lens. 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 (10). 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 (10), 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...(10’)

In still another aspect of the present invention, the conditional expression (11) is satisfied: 1.45 < n1 < 1.65 (11) 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 distance between the front main point and the rear main point of the first lens is widened, so that the rear main point of the focal length is directed to the image side, causing the focal length to change. Short and wide-angled. 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...(11’)

In still another aspect of the present 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 radius of curvature of the image side surface is smaller than the absolute value of the radius of curvature 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. In this manner, by causing the image side surface of the second lens to have a negative refractive power on the outer peripheral side or tilting the surface of the effective lens position on the image side surface of the second lens toward the image side, the peripheral image height can be imaged. The peripheral light of the beam is easily refracted and diverged, thus facilitating the correction of the short-back or the chromatic aberration of magnification.

In still another aspect of the present invention, the conditional expression (12) is satisfied: 15 < v2 < 30 (12), 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 (12), 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 conditional expression The lower limit of (12) prevents excessive correction of chromatic aberration.

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

20<v2<25...(12’)

In still another aspect of the creation, the conditional expression (13) is satisfied: -0.2<f/f4<2.0...(13)

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 (13), 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 (13), it is possible to prevent the fourth lens from having a too strong negative power, resulting in an excessively long focal length of the entire system and excessively long-distance. .

In still another aspect of the creation, the conditional formula (14) is satisfied: 1.1<f123/f<1.7...(14)

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 (14), 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 aperture is closer to the object side than the second lens, and the second and fifth lenses are negative lenses and satisfy conditional expression (13): -0.2<f/f4<2.0...(13)

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

In order to achieve the above object, the imaging device described in 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 described in 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 (CPU)

320‧‧‧Display Operation Department

330‧‧‧Operation Department

340‧‧‧Wireless Communications Department

341‧‧‧Antenna

360‧‧‧Memory (ROM)

370‧‧‧ Temporary Memory (RAM)

AS‧‧‧ aperture

AX‧‧‧ optical axis

FS‧‧ ‧ shading aperture

FS1~FS4‧‧‧shading aperture

I‧‧‧ imaging surface

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

SP‧‧‧Spherical shape

AS7‧‧‧ aspherical shape

F‧‧‧parallel plate

Fig. 1 is an explanatory diagram 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.

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 specifically different from the imaging lens 15 of the first embodiment to be described later.

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, and as a measure thereof, the object is to achieve miniaturization to the extent that the following formula (15) is satisfied.

L/2Y<0.90 (15) 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 element 51. The imaging face length is long (the diagonal length of the rectangular effective effect pixel region of the imaging element 51), and the image side focus refers to an image point when the imaging lens 10 enters parallel rays parallel to the optical axis AX. By satisfying this range, the entire camera module 50 can be miniaturized.

Further, a parallel plate such as an optical low-pass filter, an infrared cut filter, or a cover glass of an image sensor package is disposed between the image-side surface S52 and the image-side focus position of the image pickup lens 10 . In the case of F, 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...(15’)

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. Drive mechanism 55a For example, a voice coil motor and a guide rail are provided, and a specific lens can be reciprocated along the optical axis AX.

The state of the imaging lens 10 held in the barrel portion 54 will be described with reference to Fig. 2 and the like. 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, an example of a mobile phone or another portable terminal 300 on which the camera module 50 illustrated in Fig. 1 is mounted will be described with reference to Figs. 3 and 4A.

The portable terminal 300 is a smart phone type mobile communication terminal, and 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, and displays communication related information. And a display operation unit 320 of a touch panel that is operated by a user, an operation unit 330 including a power switch, and the like, and a wireless communication unit 340 required for realizing various kinds of information communication with the external server via the antenna 341. A memory unit (ROM) 360 for storing necessary data such as a system program of the portable terminal 300 or various processing programs and terminal IDs, various processing programs or data executed by the control unit 310, processing data, or imaging of the imaging device 100 Temporary storage of data, etc. A temporary memory unit (RAM) 370 that is used as a work area is stored.

The imaging device 100 includes a control unit 103, an optical system driving unit 105, an imaging device driving unit 107, an image memory 108, and the like in addition to the camera module 50 already described.

The control unit 103 controls each unit of the imaging apparatus 100. The control unit 103 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and performs various processes by cooperation with the CPU by various programs developed in the RAM and read out 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.

When the optical system drive unit 105 performs focusing, exposure, or the like under the control of the control unit 103, the first and second drive 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 image sensor driving unit 107 controls the operation of the image sensor 51 while performing exposure or the like under the control of the control unit 103. 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 distortion correction and color compensation on the image signal detected by the image sensor 51. Various image processing such as positive and compression.

The image memory 108 records the digital image signal that has been digitized from the image sensor driving unit 107, and stores it as image data that can be read and written.

Here, the imaging operation of the portable terminal 300 including the above-described imaging device 100 will be described. 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 converted into digital data by appropriately adjusting the gain in accordance with each of the RGB color components in the circuit attached to the image sensor 51. 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 function of a finder window during monitoring, and displays a captured image immediately. 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 can take still image data by appropriately operating the display operation unit 320. In response to the operation content of the display operation unit 320, the image data of one frame stored in the image memory 108 is read and 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 creation, 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 of the upper end Set, tilt to the side of the image. The image side surface S32 of the third lens L3 has an aspherical shape and has an inflection point P, and is inclined toward the image side at the effective diameter position of the upper end. The object side surface S41 of the fourth lens L4 has an aspherical shape. 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. Further, in the present embodiment, the second lens L2 is designed as a negative lens, but the third lens L3 may be configured as a negative lens, or the second and third lenses L2 and L3 may be designed as negative lenses. . In either case, part or all of the effective diameter of the third lens L3 is a negative power.

According to the above-described imaging lens 10, the object side surface S11 of the first lens L1 is convex, which is advantageous for shortening the total optical 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 The object side of the third lens L3 (more preferably, the object side of the second lens L2) is provided so that the exit pupil can be moved away from the image plane, so that the incident angle to the imaging plane I can be suppressed to be 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. Further, the image side surface S32 of the third lens L3 is inclined toward the image side at the effective diameter position intersecting the broken line, whereby the peripheral light of the light beam imaged at the maximum image height is reflected on the image side surface S32 of the third lens L3. Since the light is diverged, it is easy to make the light passing through the third lens L3 have a large angle with respect to the optical axis AX, which is advantageous for the short-back.

The imaging lens 10 of the present embodiment satisfies the conditional expression (1) described above in addition to the features of the image side surface of the third lens.

0.015<AS7/f<0.07 (1) The value AS7 is an aspherical shape of the object side surface S41 of the fourth lens L4, and an effective diameter position and a center point of the object side surface S41 of the fourth lens L4. The maximum amount of separation (mm) of the spherical shape SP (see FIG. 5), 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 (1').

0.02<AS7/f<0.05...(1’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (2) already described, except for the conditional expression (1) above.

0.75<dΦ/dz<2.5...(2) Here, the value dΦ is the diameter (the inner diameter of the opening portion) of 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. The difference between the diameter (the inner diameter of the opening portion), 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. The interval between the optical axis AX directions.

In addition, it is preferable that the imaging lens 10 of the present embodiment satisfies at least one of the following conditional expressions (2') and (2").

1.2<dΦ/dz<2.5...(2’)

0.90<dΦ/dz<2.0...(2")

The imaging lens 10 of the present embodiment satisfies the conditional expression (3) described above in addition to the features of the image side surface of the third lens.

0.03<et6/f<0.10 (3) The value et6 is the interval between the effective diameter position of the image side surface S32 of the third lens L3 and the optical axis AX direction of the effective diameter position of the object side surface S41 of the fourth lens L4.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (3').

0.05<et6/f<0.08...(3’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (4) described above in addition to the features of the image side surface of the third lens.

40< θ S7<80 (4) The value θ S7 is the maximum surface angle (°) at which the effective diameter of the object side surface S41 of the fourth lens L4 is 70% or more.

Further, it is preferable that the imaging lens 10 of the present embodiment satisfies the following conditional expression (4').

50< θ S7<75...(4')

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 satisfies the conditional expression described above in addition to the features of the image side surface of the third lens. (5).

Sag6 | / f < 0.10 (5) where the value | Sag6 | is the maximum value of the recess amount 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 (5').

| Sag6 |/f<0.05...(5’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (6) described above in addition to the features of the image side surface of the third lens.

-15< θ S6<15 (6) The value θ S6 is the maximum surface angle (°) at 90% or more of the effective diameter 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').

-10< θ S6<10...(6')

The imaging lens 10 of the present embodiment satisfies the conditional expression (7) described above in addition to the features of the image side surface of the third lens.

0.65<| Sag7 |/d7<1.50 (7) 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 (7').

0.75<| Sag7 |/d7<1.30...(7’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (8) described above in addition to the features of the image side surface of the third lens.

0.45 < θ r6 / θ r4 < 1.00 (8) where the value θ r4 is the angle of refraction of the peripheral ray LA2 farther from the optical axis AX of the diagonal image beam on the image side surface S22 of the second lens L2. The value θ r6 is the angle of refraction of the peripheral ray LA2 farther from the optical axis AX on 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 (8').

0.50< θ r6/ θ r4<0.90...(8')

The imaging lens 10 of the present embodiment satisfies the conditional expression (9) described above in addition to the features of the image side surface of the third lens.

0.05<et8/f<0.20 (9) 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 object side surface S51 of the fifth lens L5.

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

0.07<et8/f<0.15...(9’)

The imaging lens 10 of the present embodiment satisfies the conditional expression described above in addition to the features of the image side surface of the third lens. (10).

45 < v5 < 70 (10) wherein 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 (10').

50<v5<60...(10’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (11) described above in addition to the features of the image side surface of the third lens.

1.45 < n1 < 1.65 (11) wherein 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 (11').

1.50<n1<1.60...(11’)

The imaging lens 10 of the present embodiment satisfies the conditional expression (12) described above in addition to the features of the image side surface of the third lens.

15 < v2 < 30 (12) wherein 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 (12').

20<v2<25...(12’)

The imaging lens 10 of the present embodiment satisfies the conditional expression described above in addition to the features of the image side surface of the third lens. (13).

−0.2<f/f4<2.0 (13) wherein the value f4 is the focal length of the fourth lens L4.

The imaging lens 10 of the present embodiment satisfies the conditional expression (14) described above in addition to the features of the image side surface of the third lens.

1.1 < f123 / f < 1.7 (14) wherein 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 described in 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 15 and the like of the first embodiment. The imaging lens 15 is provided, in order from the object (OBJ) 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 periphery around the optical axis AX. The second lens L2 having a refractive index and having a convex surface facing the object side, the third lens L3 having a birefringence having a weak positive refractive power around the optical axis AX, and a positive refractive power around the optical axis AX and having a convex orientation image The fourth crescent-shaped fourth lens L4 on the side and the biconcave fifth lens L5 having a negative refractive power around the optical axis AX. All lenses L1 ~L5, all formed by 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, 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 15 of the first embodiment, and FIGS. 7D and 7E are diagrams showing a meridional comet image of the imaging lens 15 of the first embodiment. difference.

[Embodiment 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 an image pickup lens 17 and the like of the second embodiment. 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.

9A to 9C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 17 of the second embodiment, and FIGS. 9D and 9E are diagrams showing a meridional comet image of the imaging lens 17 of the second embodiment. difference.

[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.

Fig. 10 is a cross-sectional view showing an image pickup lens 18 and the like of the third embodiment. 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.

11A to 11C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 18 of the third embodiment, and FIGS. 11D and 11E are diagrams showing the meridional comet image of the imaging lens 18 of the third embodiment. difference.

[Example 4]

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

The aspherical coefficients of the lens surface of Example 4 are shown in Table 11 below.

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.

Fig. 12 is a cross-sectional view showing an imaging lens 23 and the like of the fourth embodiment. 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.

13A to 13C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 23 of the fourth embodiment, and FIGS. 13D and 13E are diagrams showing a meridional comet image of the imaging lens 23 of the fourth embodiment. difference.

[Example 5]

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

The aspherical coefficients of the lens faces of Example 5 are shown in Table 14 below.

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.

Fig. 14 is a cross-sectional view showing the imaging lens 24 and the like of the fifth embodiment. 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.

15A to 15C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 24 of the fifth embodiment, and FIGS. 15D and 15E are diagrams showing a meridional comet image of the imaging lens 24 of the fifth embodiment. difference.

[Embodiment 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.

Fig. 16 is a cross-sectional view showing an image pickup lens 26 and the like of the sixth embodiment. 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.

17A to 17C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 26 of the sixth embodiment, and FIGS. 17D and 17E are diagrams showing the meridional comet image of the imaging lens 26 of the sixth embodiment. difference.

[Embodiment 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 in Table 20 below.

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.

Fig. 18 is a cross-sectional view showing an imaging lens 27 and the like of the seventh embodiment. 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.

19A to 19C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 27 of the seventh embodiment, and FIGS. 19D and 19E are diagrams showing a meridional comet image of the imaging lens 27 of the seventh embodiment. difference.

[Embodiment 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 in Table 23 below.

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.

Fig. 20 is a cross-sectional view showing an image pickup lens 29 and the like of the eighth embodiment. 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.

21A to 21C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 29 of the eighth embodiment, and FIGS. 21D and 21E are diagrams showing the meridional comet image of the imaging lens 29 of the eighth embodiment. difference.

[Embodiment 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 in Table 26 below.

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.

Fig. 22 is a cross-sectional view showing the imaging lens 30 and the like of the ninth embodiment. 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.

23A to 23C are diagrams showing aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the imaging lens 30 of the ninth embodiment, and FIGS. 23D and 23E are diagrams showing a meridional comet image of the imaging lens 30 of the ninth embodiment. difference.

Table 28 below is a reference for arranging the values of the respective Examples 1 to 9 corresponding to the conditional expressions (1) to (14).

Although the present invention has been described above by way of embodiments or examples, the present invention is not limited to the above-described embodiments and the like. For example, the light-shielding apertures FS1 to FS4 are not limited to a metal plate, and may be a plate-like member of resin or ceramic, or 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, S32, S41, S42, S51, S52‧‧‧ lens surface

F‧‧‧parallel plate

OP‧‧‧ openings

Claims (24)

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; the image side surface of the third lens has an inflection point and an effective diameter of 70% or more. Some or all of them have negative power. The imaging lens according to claim 1, wherein the conditional expression (2) is satisfied: 0.75 < dΦ / dz < 2.5 (2), wherein dΦ is the inside of the opening portion of the light-shielding aperture between the fourth and fifth lenses. Difference between the diameter and the inner diameter of the opening portion of the light-shielding aperture between the third and fourth lenses: the light-shielding aperture between the fourth and fifth lenses and the light-shielding aperture between the third and fourth lenses The spacing between the axes. The imaging lens described in claim 2, wherein the conditional expression is satisfied (2'): 1.2 < dΦ / dz < 2.5 (2'). The imaging lens according to any one of claims 1 to 2, wherein the conditional expression (3) is satisfied: 0.03 < et6/f<0.10 (3), wherein et6: the effective diameter of the image side of the third lens The distance between the position and the optical axis direction of the effective diameter position of the object side surface of the fourth lens is f: the focal length of the entire imaging lens. The imaging lens according to any one of claims 1 to 2, wherein conditional expression (4): 40 < θ S7 < 80 (4) is satisfied, wherein θ S7: an effective diameter of an object side surface of the fourth lens The maximum face angle (°) at 70% or more. The imaging lens according to any one of claims 1 to 2, 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 2, wherein the conditional expression (5) is satisfied: | Sag6 | / f < 0.10 (5), wherein | Sag6 |: the front side of the image side of the third lens The maximum amount of depression f: the focal length of the entire lens. The imaging lens according to any one of claims 1 to 2, wherein the conditional expression (6) is satisfied: -15< θ S6<15 (6), wherein θ S6 is effective for the image side surface of the third lens. The maximum face angle (°) at 90% or more of the diameter. The imaging lens according to any one of claims 1 to 2, wherein the conditional expression (7) is satisfied: 0.65 <| Sag7 | / d7 < 1.50 (7), wherein | Sag7 |: the object of the fourth lens The maximum amount of depression of the side surface d7: the center thickness of the fourth lens. The imaging lens according to any one of claims 1 to 2, wherein the conditional expression (8) is satisfied: 0.45 < θ r6 / θ r4 < 1.00 (8), wherein θ r4: the front side of the image side of the second lens The angle of refraction of the peripheral ray of the upper side of the diagonal image of the high beam from the optical axis is θ r6: 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 2, wherein the conditional expression (9) is satisfied: 0.05<et8/f<0.20 (9), wherein et8: an effective diameter of the image side of the fourth lens Location and Preface 5 The interval between the optical axis directions of the effective diameter positions on the side of the object of the lens f: the focal length of the entire imaging lens. The imaging lens according to any one of claims 1 to 2, wherein the fifth lens is a negative lens and satisfies the conditional expression (10); 45 < v5 < 70 (10), wherein v5: 5 Abbe number of the lens. The imaging lens according to any one of claims 1 to 2, wherein conditional expression (11): 1.45 < n1 < 1.65 (11) is satisfied, wherein n1: the refractive index of the first lens is preceded. The imaging lens according to any one of claims 1 to 2, wherein the second lens is a negative lens. The imaging lens according to claim 14, 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 2, 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 14, 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. An image pickup lens as recited in claim 14, wherein the condition is satisfied Formula (12): 15 < v2 < 30 (12) wherein v2: the Abbe number of the second lens. The imaging lens according to any one of claims 1 to 2, wherein the conditional expression (13) is satisfied: -0.2 < f / f4 < 2.0 (13) f4: the focal length of the fourth lens is f: the entire imaging lens The focal length. The imaging lens according to any one of claims 1 to 2, wherein the conditional expression (14): 1.1 < f123/f<1.7 (14) f123: the synthesis of the first lens to the third lens before the third lens is satisfied Focal length f: The focal length of the entire camera lens. The imaging lens according to any one of claims 1 to 2, wherein the aperture aperture is closer to the object side than the second lens, and the second and fifth lenses are negative lenses, and the conditional expression (13) is satisfied. ): -0.2 < f / f4 < 2.0 (13) f4: The focal length of the fourth lens is f: the focal length of the entire imaging lens. The imaging lens according to any one of claims 1 to 2, further comprising: a lens having substantially no power. An imaging device includes the imaging lens according to any one of claims 1 to 22, and an imaging element. A portable terminal is provided with the imaging device described in claim 23.