JP2015072402A - Image capturing lens, image capturing device, and mobile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image capturing lens which is as compact as conventional lenses and yet offers a larger aperture, good correction for various aberrations, and a seven-lens configuration.SOLUTION: An image capturing lens 10 comprises, in order from the object side, a positive first lens L1, a positive second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, where the seventh lens L7 has an aspherically shaped image-side surface S72 having an extremum at a position P other than the center within an effective diameter thereof. The image capturing lens 10 satisfies the following conditional expression: 15.0<θSp<50.0...(1), where θSp represents a maximum surface angle of an object-side surface S21 of the second lens L2 within an effective diameter thereof.

Description

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

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

  On the other hand, there is a strong demand for downsizing of the image pickup apparatus on the other hand, while the demand for downsizing of the image pickup device is strong. In order to achieve both high downsizing and downsizing of the image pickup device, downsizing of the pixel size is progressing. As the pixel size of the image sensor becomes smaller, the amount of light that can be received per pixel decreases accordingly, and noise due to a decrease in the S / N ratio and image degradation due to camera shake that occurs due to a longer exposure time are problematic. Become. In order to solve the problem caused by the decrease in the amount of light that can be received per pixel, a brighter lens is demanded, and recently, a lens having a large aperture of F1.9 or less is demanded. On the other hand, increasing the diameter contributes to an increase in the amount of received light, but leads to the occurrence of monochromatic aberrations such as spherical aberration and coma aberration, and degrades optical performance. The above-mentioned Patent Document 1 describes an imaging lens having a seven-lens configuration in which the first lens is a positive lens and the second lens is a negative lens. However, only a dark imaging lens of F2.0 or higher is described, which is sufficient. A large aperture has not been achieved. Further, since the positive power of the first lens is too strong, correction of spherical aberration and coma aberration is insufficient when the aperture is increased to F1.9 or less, and it is difficult to maintain performance. Patent Document 2 describes a seven-lens imaging lens in which the first lens is a negative lens and the second lens is a positive lens. As in Patent Document 1, a dark imaging lens of F2.0 or higher is described. However, only a large diameter has not been described. Further, when the diameter is increased, the effective diameter of each lens is increased, and the thickness in the optical axis direction is increased accordingly. However, when the thickness of the negative first lens is increased, the positive second lens is moved to the image side. Therefore, the principal point position of the entire system is also closer to the image side, making it difficult to shorten the optical total length.

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

The present invention has been made in view of such a problem, and while making the imaging lens as small as that of the conventional type, the various apertures were corrected satisfactorily after being increased in diameter. An object of the present invention is to provide an imaging lens having a sheet configuration. Here, although it is a scale of a small imaging lens, the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
L / 2Y <1.00 (7)
However,
L: Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: Diagonal length of the imaging surface of the imaging device (diagonal length of the rectangular effective pixel area of the imaging device)
Here, the image side focal point refers to an image point when a parallel light beam parallel to the optical axis is incident on the imaging lens. When a parallel plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of the image pickup device package is disposed between the most image side surface of the image pickup lens and the image side focal position, the parallel plate is used. The part is assumed to be the air conversion distance and the value of L is calculated.

The value L / 2Y is more preferably in the range of the following formula.
L / 2Y <0.95 (7) '

In order to achieve the above object, an imaging lens according to the present invention includes, in order from the object side, a positive first lens, a positive second lens, a third lens, a fourth lens, a fifth lens, The image side surface of the seventh lens has an aspherical shape, has an extreme value within an effective diameter other than the center, and satisfies the following conditional expression.
15.0 <θSp <50.0 (1)
However,
θSp: Maximum surface angle within the effective diameter of the object side surface of the second lens Note that the effective diameter refers to a range in which a light beam focused on the imaging surface diagonally passes through the lens surface. The extreme value is a point on the aspheric surface where the tangential plane or tangent of the apex of the aspheric surface is a plane or line segment perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius. . The surface angle is 0 ° when parallel to the optical axis normal, is positive when tilted to the image side, and is negative when tilted to the object side.

  In the imaging lens according to the present invention, the first lens and the second lens arranged closest to the object side are positive lenses, so that the principal point position of the entire imaging lens system is closer to the object side. To be advantageous. Further, since strong positive power can be shared by the two lenses, spherical aberration and coma can be favorably corrected, and high performance can be achieved. In addition, by making the image side surface of the seventh lens an aspherical surface having an extreme value within an effective diameter other than the center, it is possible to suppress the incident angle when a light beam having a peripheral image height is incident on the image surface. Become. Therefore, it is possible to improve the light receiving efficiency of the sensor when the image sensor is used.

  Conditional expression (1) defines the maximum surface angle within the effective diameter of the second lens. By exceeding the lower limit of conditional expression (1), a part of the object side surface of the second lens becomes a surface inclined to the image side, but the light converged by the first lens having positive power is the second lens. When incident on, the incident angle does not become large. Therefore, the occurrence of spherical aberration can be reduced, which is advantageous for high performance. On the other hand, since the surface angle is not excessively applied to the object side surface of the second lens by falling below the upper limit of the conditional expression (1), it is possible to prevent occurrence of spherical aberration and coma aberration due to excessive positive power. it can.

As for the value of conditional expression (1), the range of the following expression is more desirable.
25.0 <θSp <50.0 (1) ′
More preferably, the range of the following formula is good.
35.0 <θSp <50.0 (1) "

  According to a specific aspect of the present invention, in the imaging lens, the seventh lens is a negative lens whose image side surface is concave in the vicinity of the optical axis. In this case, since the seventh lens as the final lens is a negative lens and the image side surface is concave, the image surface is moved away from the seventh lens, so that necessary back focus can be ensured. For example, in an auto-focus imaging device, a mechanism for changing the distance between the lens and the sensor is provided. Therefore, the distance between the lens and the sensor is required to be large to some extent, and the back focus can be ensured as described above. Become important.

  According to another aspect of the present invention, the imaging lens has an aperture stop closer to the object side than the fourth lens. In this case, by arranging the aperture stop closer to the object side than the fourth lens, the exit pupil position can be moved away from the image plane, so that the incident angle of the light beam on the image plane can be kept small.

  In still another aspect of the present invention, the third lens is a negative lens having a concave surface facing the image side. In this case, if the third lens is a negative lens, the negative lens is disposed at a position where the axial light beam diameter is large, so that the chromatic aberration can be corrected well and high performance can be achieved. Further, since the third lens directs the concave surface to the image side, the incident angle when the light beam of the axial ray bundle converged by the first lens and the second lens is incident on the image side surface of the third lens is small. Therefore, the occurrence of spherical aberration is reduced, and aberration correction is improved.

  In still another aspect of the present invention, the first lens and the second lens have convex surfaces facing the object side. In this case, since the first lens and the second lens having positive power have their convex surfaces facing the object side, the principal point position is closer to the object side, so the principal point position of the entire imaging lens system is also the object side. This is advantageous in shortening the total optical length.

In still another aspect of the invention, the first lens has a first aperture member having a predetermined aperture on the object side, and the third lens has a second aperture having a predetermined aperture on at least one of the object side and the image side. It has members and satisfies the following conditional expression.
0.70 <Φs3 / Φs1 <1.00 (2)
However,
Φs1: Aperture diameter of the first diaphragm member Φs3: Aperture diameter of the second diaphragm member When the second diaphragm member is disposed on both the object side and the image side of the third lens, Condition (2) is satisfied regardless of which value Φs3 on the image side is used. Further, one of the first diaphragm member and the second diaphragm member may be an aperture diaphragm.

  Conditional expression (2) is a ratio of the aperture diameter of the first diaphragm member disposed on the object side of the first lens and the aperture diameter of the second diaphragm member disposed on at least one of the object side and the image side of the third lens. Is stipulated. In a large-aperture lens, coma aberration is prominent and difficult to correct. In order to improve the coma aberration, it is conceivable to dispose a diaphragm member and block a part of the light beam formed at the peripheral image height. However, by lowering the upper limit of the conditional expression (2), Since the aperture diameter of the second diaphragm member disposed in the vicinity of the three lenses is made relatively smaller than the diameter of the first diaphragm member disposed closest to the object side, the light flux at the peripheral image height is appropriately blocked. The coma aberration can be improved. On the other hand, exceeding the lower limit of conditional expression (2) prevents the aperture diameter of the second diaphragm member in the vicinity of the third lens from becoming too small. be able to.

As for the value of conditional expression (2), the range of the following expression is more desirable.
0.75 <Φs3 / Φs1 <0.95 (2) ′
More preferably, the range of the following formula is good.
0.80 <Φs3 / Φs1 <0.90 (2) "

In still another aspect of the present invention, the imaging lens satisfies the following conditional expression.
1.0 <ΦL1 / ΦL3 <1.4 (3)
However,
ΦL1: The larger effective diameter of the object side surface and the image side surface of the first lens ΦL3: The larger effective diameter of the object side surface and the image side surface of the third lens

  Conditional expression (3) defines the ratio of the effective diameters of the first lens and the third lens. The third lens has an effect of correcting axial chromatic aberration and spherical aberration for the axial light beam and correcting coma aberration for the peripheral light beam. In order to correct the various aberrations generated in the first lens or the second lens having a strong positive power when the height is lowered, the third lens needs a strong power. However, if the effective diameter of the third lens is increased, the axial light beam and the peripheral light beam pass through different positions of the third lens, and thus are strong against both the axial light beam and the peripheral light beam. The power cannot be demonstrated. By exceeding the lower limit of conditional expression (3), the effective diameter of the third lens is reduced, and the axial light beam and the peripheral light beam pass through close positions in the third lens. As a result, since strong power can be exhibited for both, it is possible to correct both spherical aberration, axial chromatic aberration and coma. Further, by falling below the upper limit of the conditional expression (3), it is possible to prevent the vignetting of the peripheral image height due to the effective diameter of the third lens becoming too small, and the shortage of the light amount of the peripheral image height. it can. In addition, it is possible to avoid an increase in the total optical length due to the effective diameter of the first lens or the second lens becoming too large and the first lens or the second lens becoming thick in the optical axis direction.

As for the value of conditional expression (3), the range of the following expression is more desirable.
1.05 <ΦL1 / ΦL3 <1.35 (3) ′
More preferably, the range of the following formula is good.
1.1 <ΦL1 / ΦL3 <1.3 (3) "

In still another aspect of the present invention, the imaging lens satisfies the following conditional expression.
0.2 <f1 / f2 <1.4 (4)
However,
f1: Focal length of the first lens f2: Focal length of the second lens

  Conditional expression (4) defines the ratio of the focal lengths of the first lens and the second lens. By satisfying the range of conditional expression (4), the power balance between the first lens and the second lens, which are positive lenses, becomes appropriate. For this reason, it is possible to prevent the lens power from being biased and the aberration generated by either lens having an extremely strong power from increasing.

As for the value of conditional expression (4), the range of the following expression is more desirable.
0.35 <f1 / f2 <1.35 (4) ′
More preferably, the range of the following formula is good.
0.4 <f1 / f2 <1.3 (4) "

In still another aspect of the present invention, the imaging lens satisfies the following conditional expression.
−1.0 <f12 / f3 <−0.4 (5)
However,
f12: Composite focal length of the first lens and the second lens f3: Focal length of the third lens

  Conditional expression (5) defines the ratio of the combined focal length of the first lens and the second lens to the focal length of the third lens. By exceeding the lower limit of conditional expression (5), the power of the negative third lens does not become excessively strong with respect to the positive first lens and the positive second lens. Can be. In addition, by falling below the upper limit of the conditional expression (5), the negative third lens has a somewhat strong power with respect to the first lens and the second lens, so that the correction of chromatic aberration is improved and the performance is improved. be able to.

The value of conditional expression (5) is more preferably in the range of the following expression.
−0.9 <f12 / f3 <−0.45 (5) ′
More preferably, the range of the following formula is good.
−0.8 <f12 / f3 <−0.5 (5) ”

In still another aspect of the invention, the fourth lens is a positive lens and satisfies the following conditional expression.
1.5 <f4 / f <5.0 (6)
However,
f4: focal length of the fourth lens f: focal length of the entire imaging lens system

  Conditional expression (6) defines the ratio between the focal length of the fourth lens and the focal length of the entire imaging lens system. Since the fourth lens has a positive power, it can share the positive power with the first lens and the second lens and suppress the occurrence of aberration, but if the power becomes too strong, the entire imaging lens system This is disadvantageous for shortening the optical total length. On the other hand, if the power of the fourth lens is too weak, the focal length of the entire imaging lens system cannot be shortened, resulting in telephoto. By exceeding the lower limit of conditional expression (6), the positive power of the fourth lens does not become too strong, so that the principal point position of the entire imaging lens system can be moved closer to the object side, and the optical total length It is advantageous for shortening. In addition, by falling below the upper limit of conditional expression (6), the fourth lens has a strong positive power to some extent, so that the focal length of the entire imaging lens system can be shortened, and telephotometry is prevented. be able to.

As for the value of conditional expression (6), the range of the following expression is more desirable.
1.6 <f4 / f <4.0 (6) ′
More preferably, the range of the following formula is good.
1.7 <f4 / f <3.5 (6) "

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

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

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

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

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

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

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

  The imaging lens 10 includes, in order from the object side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. With. Between these first to seventh lenses L1 to L7, an aperture stop AS and first and second stop members FS1 and FS2 are disposed at appropriate positions such as the object side of the first lens L1. In addition, what is arranged at the position of the first and second diaphragm members FS1, FS2 may be an aperture diaphragm AS.

The imaging lens 10 is small in size, and as a scale, it aims at miniaturization at a level satisfying the following expression (7).
L / 2Y <1.00 (7)
Here, L is the distance on the optical axis AX from the most object side lens surface (object side surface S11) of the entire imaging lens 10 system to the image side focal point, and 2Y is the diagonal length of the imaging surface of the image sensor 51 ( (Diagonal length of the rectangular effective pixel area of the image sensor 51). The image-side focal point refers to an image point when parallel light rays parallel to the optical axis AX are incident on the imaging lens 10. By satisfying this range, the entire camera module 50 can be reduced in size.

A parallel flat plate F such as an optical low-pass filter, an infrared cut filter, or a seal glass of an image pickup device package is disposed between the most image side surface (image side surface S72) of the image pickup lens 10 and the image side focal position. In this case, the value of L is calculated for the parallel flat plate F portion as an air conversion distance. The value L / 2Y is more preferably in the range of the following formula.
L / 2Y <0.95 (7) '

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

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

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

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

  With reference to FIG. 2 etc., the state of the imaging lens 10 hold | maintained at the lens-barrel part 54 is demonstrated. The first to seventh lenses L <b> 1 to L <b> 7 constituting the imaging lens 10 each have a relatively thick flange portion 39 for support on the outer periphery, and are laminated with adjacent lenses via the flange portion 39. Is held in the lens barrel portion 54a. Between these lenses L <b> 1 to L <b> 7, for example, one aperture stop AS and five light-shielding stops FS sandwiched between the flange portions 39 are arranged to prevent the generation of stray light. On the object side of the lens barrel portion 54a, for example, a light-shielding stop FS that covers the periphery of the effective diameter of the first lens L1 is formed. A light-shielding stop FS is also disposed on the image side of the seventh lens L7.

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

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

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

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

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

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

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

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

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

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

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

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

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

  Hereinafter, returning to FIG. 1 and the like, the imaging lens 10 according to an embodiment of the present invention will be described in detail. An imaging lens 10 shown in FIG. 1 forms a subject image on an imaging surface (projected surface) I of an imaging device 51, and is a positive first lens with a convex surface facing the object side in order from the object side. L1, a positive second lens L2 having a convex surface facing the object side, a negative third lens L3 having a concave surface facing the image side, a positive fourth lens L4, a fifth lens L5, and a sixth lens L6 and a negative seventh lens L7 having a concave surface facing the image side in the vicinity of the optical axis AX. In the imaging lens 10, the object side surface S71 and the image side surface S72 of the seventh lens L7 closest to the image side are aspheric surfaces, and in particular, the image side surface S72 has an extreme value at a position P within the effective diameter other than the center. The imaging lens 10 has an aperture stop AS on the object side from the fourth lens L4. In the illustrated example, the aperture stop AS is disposed between the second and third lenses L2 and L3. In the imaging lens 10, a first diaphragm member FS1 is disposed on the object side of the first lens L1, and a second diaphragm member FS2 is disposed on at least one of the object side and the image side of the third lens L3. Here, the first diaphragm member FS1 functions as a light-shielding diaphragm FS having a predetermined first opening, and the second diaphragm member FS2 functions as a light-shielding diaphragm FS having a predetermined second opening. Further, one of the first diaphragm member FS1 and the second diaphragm member FS2 may be the aperture diaphragm AS. In the illustrated example, the aperture stop AS arranged on the object side of the third lens L3 satisfies the conditional expression (2) as the second stop member FS2. Further, the value Φs3 / 2 in FIG. 2 indicates half of the aperture diameter of the second diaphragm member FS2 on the image side of the third lens L3 for convenience.

  According to the imaging lens 10, the first lens L1 and the second lens L2 arranged closest to the object side are positive lenses, so that the principal point position of the entire imaging lens 10 system is closer to the object side. This is advantageous for shortening the overall length. At the same time, since strong positive power can be shared by the two lenses, spherical aberration and coma can be corrected well, and high performance can be achieved. Further, by making the image side surface S72 of the seventh lens L7 an aspherical surface having an extreme value at a position P within the effective diameter other than the center, a light beam having a peripheral image height is incident on the image plane or the imaging plane I. The incident angle can be kept small. Therefore, the light receiving efficiency of the image sensor 51 can be improved.

In the imaging lens 10, the value θSp is defined as the maximum surface angle within the effective diameter of the object side surface S21 of the second lens L2, and the following conditional expression (1)
15.0 <θSp <50.0 (1)
Is satisfied.

The value θSp of the conditional expression (1) is more preferably within the range of the following conditional expressions (1) ′ and (1) ″.
25.0 <θSp <50.0 (1) ′
35.0 <θSp <50.0 (1) "

  According to the imaging lens 10, when the value θSp exceeds the lower limit of the conditional expression (1), a part of the object side surface S21 of the second lens L2 becomes a surface inclined toward the image side, but has a positive power. When the light converged by the first lens L1 enters the second lens L2, the incident angle does not become large. Therefore, the occurrence of spherical aberration can be reduced, which is advantageous for high performance. On the other hand, since the value θSp is below the upper limit of the conditional expression (1), the object side surface S21 of the second lens L2 does not have an excessive surface angle. Occurrence can be prevented.

In addition to the conditional expression (1), the imaging lens 10 of the present embodiment has the conditional expression (2) already described.
0.70 <Φs3 / Φs1 <1.00 (2)
Satisfied. However, the value Φs1 is the opening diameter of the first diaphragm member FS1, and the value Φs3 is the opening diameter of the second diaphragm member FS2. When the second diaphragm member FS2 is disposed on both the object side and the image side of the third lens L3, the conditional expression (2) can be obtained by using any value Φs3 on the object side and the image side of the third lens L3. Fulfill.
The value Φs3 / Φs1 of the conditional expression (2) is more preferably within the range of the following conditional expressions (2) ′ and (2) ″.
0.75 <Φs3 / Φs1 <0.95 (2) ′
0.80 <Φs3 / Φs1 <0.90 (2) "

In addition to the conditional expression (1), the imaging lens 10 of the present embodiment has the conditional expression (3) already described.
1.0 <ΦL1 / ΦL3 <1.4 (3)
Satisfied. However, the value ΦL1 is the larger effective diameter of the object side surface S11 and the image side surface S12 of the first lens L1, and the value ΦL3 is the larger of the object side surface S31 and the image side surface S32 of the third lens L3. Is the effective diameter.
The value ΦL1 / ΦL3 of the conditional expression (3) is more preferably within the range of the following conditional expressions (3) ′ and (3) ″.
1.05 <ΦL1 / ΦL3 <1.35 (3) ′
1.1 <ΦL1 / ΦL3 <1.3 (3) "

In addition to the conditional expression (1), the imaging lens 10 of the present embodiment has the conditional expression (4) already described.
0.2 <f1 / f2 <1.4 (4)
Satisfied. However, the value f1 is the focal length of the first lens L1, and the value f2 is the focal length of the second lens L2.
The value f1 / f2 of the conditional expression (4) is more preferably within the range of the following conditional expressions (4) ′ and (4) ″.
0.35 <f1 / f2 <1.35 (4) ′
0.4 <f1 / f2 <1.3 (4) "

In addition to the conditional expression (1), the imaging lens 10 of the present embodiment has the conditional expression (5) already described.
−1.0 <f12 / f3 <−0.4 (5)
Satisfied. However, the value f12 is the combined focal length of the first lens L1 and the second lens L2, and the value f3 is the focal length of the third lens L3.
The value f12 / f3 of the conditional expression (5) is more preferably within the range of the following conditional expressions (5) ′ and (5) ″.
−0.9 <f12 / f3 <−0.45 (5) ′
−0.8 <f12 / f3 <−0.5 (5) ”

In addition to the conditional expression (1), the imaging lens 10 of the present embodiment has the conditional expression (6) already described.
1.5 <f4 / f <5.0 (6)
Satisfied. However, the value f4 is the focal length of the fourth lens L4, and the value f is the focal length of the entire imaging lens 10.
The value f4 / f of conditional expression (6) is more preferably within the range of the following conditional expressions (6) ′ and (6) ″.
1.6 <f4 / f <4.0 (6) ′
1.7 <f4 / f <3.5 (6) "

  Although not particularly illustrated, the imaging lens 10 according to the present embodiment may further include an optical element having substantially no power.

ただし、
Ａｉ：ｉ次の非球面係数
Ｒ：曲率半径
Ｋ：円錐定数
さらに、各実施例において、「ＳＴＯ」は開口絞りＡＳを意味し、「ＦＳ」は遮光絞りＦＳを意味する。
なお、各実施例の撮像レンズ１０が前提とする使用基本波長は５８７．５６ｎｍであり、曲率半径等の面形状の単位はｍｍである。 〔Example〕
Hereinafter, specific examples of the imaging lens according to the present invention will be described. In each embodiment, r represents the radius of curvature, d represents the axial top surface spacing, nd represents the refractive index of the lens material with respect to the d-line, vd represents the Abbe number of the lens material, “eff. “dia.” means an effective diameter. In addition, the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface has the vertex of the surface as the origin, the X axis in the optical axis AX direction, The height in the direction perpendicular to the axis AX is represented by “Equation 1” below.

However,
Ai: i-order aspherical coefficient R: radius of curvature K: conical constant Further, in each embodiment, “STO” means the aperture stop AS, and “FS” means the light blocking stop FS.
In addition, the use fundamental wavelength which the imaging lens 10 of each Example presupposes is 587.56 nm, and the unit of surface shape, such as a curvature radius, is mm.

[Example 1]
The lens surface data of Example 1 is shown in Table 1 below.
[Table 1]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 3.0877 0.2429 1.54470 56 2.625
3 * 10.0569 0.0500 2.537
4 * 3.8007 0.6008 1.54470 56 2.584
5 * -38.7267 0.1500 2.488
STO INFINITY -0.1000 2.356
7 * 1.5698 0.1500 1.64250 22.5 2.301
8 * 1.0947 0.4196 2.113
9 FS INFINITY 0.1000 2.160
10 * 8.9139 0.4687 1.54470 56 2.260
11 * -11.1215 0.2354 2.478
12 * -12.0730 0.3091 1.64250 22.5 2.736
13 * 155.8189 0.2481 3.052
14 * 5.3402 0.6051 1.54470 56 3.268
15 * -2.3027 0.2949 3.772
16 * 3.5400 0.3154 1.54470 56 4.487
17 * 0.9517 0.7000 4.998
18 INFINITY 0.1100 1.51633 64.1 5.800
19 INFINITY 0.0998

The aspheric coefficients of the lens surfaces of Example 1 are shown in Table 2 below.
[Table 2]
Second side
K = 3.14469e + 000, A4 = -6.95429e-002, A6 = 1.31284e-002,
A8 = 1.63304e-002, A10 = -9.21230e-003, A12 = 3.19837e-003,
A14 = -8.18358e-004
Third side
K = 0.00000e + 000, A4 = 2.58570e-002, A6 = -8.95477e-003,
A8 = 1.95481e-002, A10 = -1.45187e-003
4th page
K = 0.00000e + 000, A4 = 1.28437e-001, A6 = -5.40014e-002,
A8 = 1.69899e-002, A10 = 3.32878e-003, A12 = -4.10499e-003,
A14 = 1.28852e-003
5th page
K = -7.99672e + 001, A4 = 1.11510e-001, A6 = -1.57728e-001,
A8 = 1.20500e-001, A10 = -6.74656e-002, A12 = 2.67600e-002,
A14 = -4.86280e-003
7th page
K = -1.03254e + 001, A4 = -1.90187e-002, A6 = -8.38271e-002,
A8 = 5.85852e-002, A10 = -1.32169e-002, A12 = 6.99676e-003,
A14 = -3.54185e-003
8th page
K = -5.18781e + 000, A3 = 1.38754e-003, A4 = -2.37274e-002,
A5 = -3.20132e-003, A6 = 5.23434e-002, A8 = -1.27542e-001,
A10 = 1.74784e-001, A12 = -1.04428e-001, A14 = 2.54802e-002
10th page
K = 4.29327e + 001, A3 = -2.62788e-002, A4 = 7.21461e-002,
A5 = -2.60745e-001, A6 = 2.51901e-001, A8 = -1.73488e-001,
A10 = 1.23271e-001, A12 = -7.38758e-002, A14 = 1.94337e-002
11th page
K = 3.04695e + 001, A3 = 2.32952e-002, A4 = -1.88217e-001,
A5 = 1.02995e-001, A6 = -5.89021e-002, A8 = 2.71134e-002,
A10 = -1.63347e-002, A12 = 2.80196e-003
12th page
K = 7.30212e + 001, A3 = 9.58973e-002, A4 = -4.80614e-001,
A5 = 3.96710e-001, A6 = -2.12112e-001, A8 = 1.07657e-001,
A10 = -2.35607e-002, A12 = -7.15687e-004
Side 13
K = 5.79513e + 001, A3 = 7.30018e-002, A4 = -3.61439e-001,
A5 = 1.67587e-001, A6 = -1.34589e-002, A8 = 1.20160e-002,
A10 = 2.99846e-003, A12 = -2.61492e-003, A14 = 9.51885e-005
14th page
K = 7.80952e + 000, A3 = -1.80172e-002, A4 = 3.57360e-002,
A5 = -1.29570e-001, A6 = 7.05478e-002, A8 = -3.21922e-002,
A10 = 1.38504e-002, A12 = -4.03986e-003, A14 = 5.43929e-004
15th page
K = -1.58022e + 001, A3 = -1.14890e-001, A4 = 1.32161e-001,
A5 = -1.39512e-002, A6 = -3.92826e-002, A8 = -5.44582e-003,
A10 = 7.43779e-003, A12 = -1.47065e-003, A14 = 8.18453e-005
16th page
K = -7.87638e + 001, A3 = -1.82043e-001, A4 = -1.37148e-001,
A5 = 7.15714e-002, A6 = 2.93848e-002, A8 = -4.85530e-003,
A10 = -4.60160e-004, A12 = 1.31370e-004, A14 = -7.23796e-006
17th page
K = -5.01194e + 000, A3 = -1.18906e-001, A4 = -7.87955e-002,
A5 = 1.07798e-001, A6 = -3.49386e-002, A8 = 1.66878e-003,
A10 = -1.65037e-004, A12 = 3.77975e-006, A14 = 1.32544e-006
In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰⁰² ) is expressed using e (for example, 2.5e−002).

The characteristics of the imaging lens 10 of Example 1 are listed below.
FL 3.786
Fno 1.44
w 74.22
Ymax 2.921
BF 0.910
TL 5.000
BFa 0.872
TLa 4.962
Here, FL means the focal length of the entire imaging lens 10, Fno means the F number, w means the diagonal field angle, Ymax means the maximum image height, that is, the half value of the diagonal length of the imaging surface of the imaging device. BF means back focus (final lens to image plane), and TL means the entire length of the system. BFa means back focus (final lens to imaging surface I (however, back focus when the parallel plate F is the air conversion length), and TLa is the entire system length (final lens to imaging surface I (how to parallel plate). This means the total length of the system when F is the air equivalent length. Note that the above symbols have the same meaning in the following embodiments.

The single lens data of Example 1 is shown in Table 3 below.
[Table 3]
Lens number Surface number Focal length Effective diameter
Elem Surfs Focal Length Diameter
1 2- 3 8.0809 2.625
2 4--5 6.3857 2.584
3 7- 8 -6.4234 2.301
4 10-11 9.1595 2.478
5 12-13 -17.4268 3.052
6 14-15 3.0386 3.772
7 16-17 -2.4971 4.998

  FIG. 5 is a cross-sectional view of the imaging lens 11 and the like of the first embodiment. The imaging lens 11 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and a positive lens around the optical axis AX. A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive refraction around the optical axis AX A biconvex sixth lens L6 having power, and a meniscus seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2, L3. That is, the second diaphragm member FS2 is arranged as the aperture diaphragm AS on the object side of the third lens L3. A light-shielding stop FS is disposed between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. Specifically, the first diaphragm member FS1 is disposed on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3. For example, a parallel plate (not shown) having an appropriate thickness can be disposed between the light incident surface of the first lens L1 and the object.

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

[Example 2]
The lens surface data of Example 2 is shown in Table 4 below.
[Table 4]
Surface number rd nd vd eff.dia.
STO INFINITY 0.0000 2.625
2 * 3.5362 0.2115 1.54470 56 2.625
3 * 15.1944 0.0500 2.561
4 * 4.6491 0.8808 1.54470 56 2.619
5 * -23.2597 0.0500 2.395
6 * 1.7953 0.1500 1.64250 22.5 2.240
7 * 1.1983 0.3212 2.199
8 FS INFINITY 0.1000 2.260
9 * 7.4020 0.4667 1.54470 56 2.355
10 * -9.2239 0.1785 2.550
11 * -11.6396 0.2000 1.64250 22.5 2.734
12 * -36.1025 0.4275 3.000
13 * 4.4886 0.4778 1.54470 56 3.496
14 * -3.0787 0.3581 3.891
15 * 3.0407 0.3179 1.54470 56 4.774
16 * 0.9606 0.4000 5.113
17 INFINITY 0.1100 1.51633 64.1 6.000
18 INFINITY 0.4000

The aspherical coefficient of the lens surface of Example 2 is shown in Table 5 below.
[Table 5]
Second side
K = 3.74178e + 000, A4 = -7.39695e-002, A6 = 2.06813e-002,
A8 = 1.32843e-002, A10 = -9.71298e-003, A12 = 3.41304e-003,
A14 = -7.03530e-004
Third side
K = 0.00000e + 000, A4 = 3.35801e-002, A6 = -1.57042e-002,
A8 = 2.04172e-002, A10 = -2.72188e-003
4th page
K = 0.00000e + 000, A4 = 1.22389e-001, A6 = -5.56821e-002,
A8 = 1.54569e-002, A10 = 4.02555e-003, A12 = -3.62642e-003,
A14 = 9.01883e-004
5th page
K = -8.00000e + 001, A4 = 9.33428e-002, A6 = -1.53900e-001,
A8 = 1.21016e-001, A10 = -6.70573e-002, A12 = 2.57626e-002,
A14 = -4.86280e-003
6th page
K = -1.35634e + 001, A4 = -3.03279e-002, A6 = -9.22912e-002,
A8 = 5.91280e-002, A10 = -1.42962e-002, A12 = 6.11980e-003,
A14 = -3.54185e-003
7th page
K = -5.91619e + 000, A3 = -1.94072e-003, A4 = -3.55606e-002,
A5 = -8.27216e-003, A6 = 5.15963e-002, A8 = -1.29101e-001,
A10 = 1.71563e-001, A12 = -1.07214e-001, A14 = 2.59775e-002
9th page
K = 3.51444e + 001, A3 = -2.17463e-002, A4 = 6.78250e-002,
A5 = -2.59891e-001, A6 = 2.54801e-001, A8 = -1.74084e-001,
A10 = 1.23799e-001, A12 = -7.32542e-002, A14 = 1.65879e-002
10th page
K = 1.47378e + 001, A3 = 3.96923e-002, A4 = -1.83664e-001,
A5 = 1.00258e-001, A6 = -5.89501e-002, A8 = 3.12131e-002,
A10 = -1.46491e-002, A12 = 6.80230e-004
11th page
K = 7.05463e + 001, A3 = 9.58904e-002, A4 = -4.94945e-001,
A5 = 3.95499e-001, A6 = -2.04246e-001, A8 = 1.12924e-001,
A10 = -2.31689e-002, A12 = -1.98811e-003
12th page
K = -8.00000e + 001, A3 = 5.00614e-002, A4 = -3.57488e-001,
A5 = 1.74376e-001, A6 = -1.12669e-002, A8 = 1.33714e-002,
A10 = 3.71003e-003, A12 = -2.82517e-003, A14 = -1.60630e-004
Side 13
K = 1.87188e + 000, A3 = -3.06359e-002, A4 = 5.38193e-002,
A5 = -1.26625e-001, A6 = 7.55144e-002, A8 = -3.48636e-002,
A10 = 1.45460e-002, A12 = -3.83816e-003, A14 = 4.62248e-004
14th page
K = -3.82868e + 001, A3 = -1.24893e-001, A4 = 1.08434e-001,
A5 = -2.15384e-003, A6 = -3.39530e-002, A8 = -6.23491e-003,
A10 = 7.20618e-003, A12 = -1.45829e-003, A14 = 8.42125e-005
15th page
K = -4.58205e + 001, A3 = -1.91512e-001, A4 = -1.36185e-001,
A5 = 7.22729e-002, A6 = 2.96169e-002, A8 = -4.85569e-003,
A10 = -4.68694e-004, A12 = 1.31270e-004, A14 = -7.14568e-006
16th page
K = -5.03018e + 000, A3 = -1.06502e-001, A4 = -8.51981e-002,
A5 = 1.10011e-001, A6 = -3.45846e-002, A8 = 1.52874e-003,
A10 = -1.59674e-004, A12 = 5.06936e-006, A14 = 1.17178e-006

The characteristics of the imaging lens 10 of Example 2 are listed below.
FL 3.774
Fno 1.44
w 75.40
Ymax 2.921
BF 0.910
TL 5.100
BFa 0.873
TLa 5.063

The single lens data of Example 2 is shown in Table 6 below.
[Table 6]
Elem Surfs Focal Length Diameter
1 2- 3 8.4074 2.625
2 4- 5 7.1935 2.619
3 6-7 -6.2199 2.240
4 9-10 7.6145 2.550
5 11-12 -26.8215 3.000
6 13-14 3.4289 3.891
7 15-16 -2.7249 5.113

  FIG. 7 is a cross-sectional view of the imaging lens 12 and the like of the second embodiment. The imaging lens 12 includes, in order from the object side, a first meniscus lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and a positive lens around the optical axis AX. A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having a weak negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1. A light shielding stop FS is disposed between the third and fourth lenses L3 and L4. That is, the first diaphragm member FS1 is disposed as the aperture diaphragm AS on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Example 3
The lens surface data of Example 3 is shown in Table 7 below.
[Table 7]
Surface number rd nd vd eff.dia.
STO INFINITY 0.0000 2.625
2 * 3.9844 0.2500 1.54470 56.2 2.625
3 * -30.0690 0.0500 2.546
4 * 6.0010 0.8255 1.54470 56.2 2.595
5 * -59.5129 0.0500 2.362
6 * 1.7173 0.1500 1.63469 23.9 2.222
7 * 1.1598 0.3360 2.239
8 FS INFINITY 0.0700 2.240
9 * 7.3807 0.4852 1.54470 56.2 2.345
10 * -8.1001 0.1857 2.535
11 * -11.5969 0.2009 1.63469 23.9 2.719
12 * 76.2965 0.4224 2.980
13 * 4.1635 0.4970 1.54470 56.2 3.487
14 * -2.9703 0.3533 3.916
15 * 2.7197 0.3145 1.54470 56.2 4.669
16 * 0.9380 0.7000 5.118
17 INFINITY 0.1100 1.51633 64.1 5.749
18 INFINITY 0.1000

The aspherical coefficients of the lens surfaces of Example 3 are shown in Table 8 below.
[Table 8]
Second side
K = 4.75904e + 000, A4 = -7.08543e-002, A6 = 2.55215e-002,
A8 = 1.38998e-002, A10 = -9.41272e-003, A12 = 3.29702e-003,
A14 = -6.31931e-004
Third side
K = 0.00000e + 000, A4 = 4.35606e-002, A6 = -9.54602e-003,
A8 = 1.85383e-002, A10 = -1.40441e-003
4th page
K = 0.00000e + 000, A4 = 1.30180e-001, A6 = -5.58269e-002,
A8 = 1.60864e-002, A10 = 4.04500e-003, A12 = -3.62188e-003,
A14 = 9.01883e-004
5th page
K = 8.00000e + 001, A4 = 9.01890e-002, A6 = -1.49124e-001,
A8 = 1.23306e-001, A10 = -6.63402e-002, A12 = 2.44064e-002,
A14 = -4.86280e-003
6th page
K = -1.21402e + 001, A4 = -2.39782e-002, A6 = -8.57697e-002,
A8 = 6.26993e-002, A10 = -2.05358e-002, A12 = 6.11980e-003,
A14 = -3.54185e-003
7th page
K = -5.47502e + 000, A3 = -2.60490e-003, A4 = -3.00630e-002,
A5 = -5.35854e-003, A6 = 5.34571e-002, A8 = -1.28165e-001,
A10 = 1.69419e-001, A12 = -1.10209e-001, A14 = 2.73640e-002
9th page
K = 3.57434e + 001, A3 = -1.96169e-002, A4 = 6.63363e-002,
A5 = -2.56825e-001, A6 = 2.55907e-001, A8 = -1.76594e-001,
A10 = 1.25144e-001, A12 = -7.10711e-002, A14 = 1.46368e-002
10th page
K = -4.02829e + 001, A3 = 3.52067e-002, A4 = -1.76533e-001,
A5 = 9.55274e-002, A6 = -6.44083e-002, A8 = 3.07867e-002,
A10 = -1.38879e-002, A12 = 4.93146e-004
11th page
K = 7.08494e + 001, A3 = 8.14154e-002, A4 = -4.95365e-001,
A5 = 3.98250e-001, A6 = -2.00913e-001, A8 = 1.13885e-001,
A10 = -2.31332e-002, A12 = -2.02245e-003
12th page
K = -8.00000e + 001, A3 = 3.31536e-002, A4 = -3.67414e-001,
A5 = 1.78404e-001, A6 = -5.72966e-003, A8 = 1.56134e-002,
A10 = 3.66127e-003, A12 = -3.11167e-003, A14 = -1.43138e-004
Side 13
K = 1.41456e + 000, A3 = -1.51148e-002, A4 = 3.96559e-002,
A5 = -1.33805e-001, A6 = 8.70433e-002, A8 = -3.59301e-002,
A10 = 1.38929e-002, A12 = -3.62507e-003, A14 = 4.30313e-004
14th page
K = -3.53240e + 001, A3 = -1.08710e-001, A4 = 9.12049e-002,
A5 = 5.94547e-003, A6 = -3.25071e-002, A8 = -7.49311e-003,
A10 = 7.15214e-003, A12 = -1.40165e-003, A14 = 8.23359e-005
15th page
K = -3.82502e + 001, A3 = -2.04424e-001, A4 = -1.33618e-001,
A5 = 7.21841e-002, A6 = 2.96147e-002, A8 = -4.86011e-003,
A10 = -4.75408e-004, A12 = 1.30382e-004, A14 = -6.98084e-006
16th page
K = -4.35152e + 000, A3 = -1.43655e-001, A4 = -7.65365e-002,
A5 = 1.13460e-001, A6 = -3.54246e-002, A8 = 1.30899e-003,
A10 = -1.53250e-004, A12 = 7.21323e-006, A14 = 8.72515e-007

The characteristics of the imaging lens 10 of Example 3 are listed below.
FL 3.774
Fno 1.44
w 75.40
Ymax 2.921
BF 0.910
TL 5.100
BFa 0.873
TLa 5.063

The single lens data of Example 3 is shown in Table 9 below.
[Table 9]
Elem Surfs Focal Length Diameter
1 2- 3 6.4758 2.625
2 4- 5 10.0526 2.595
3 6- 7 -6.2855 2.239
4 9-10 7.1691 2.535
5 11-12 -15.8469 2.980
6 13-14 3.2628 3.916
7 15-16 -2.8032 5.118

  FIG. 9 is a cross-sectional view of the imaging lens 13 and the like of the third embodiment. The imaging lens 13 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the object side, a third meniscus lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and a periphery of the optical axis AX. A biconvex fourth lens L4 having positive refractive power, a substantially concave fifth lens L5 having negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power of 5 and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1. A light shielding stop FS is disposed between the third and fourth lenses L3 and L4. That is, the first diaphragm member FS1 is disposed as the aperture diaphragm AS on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Example 4
The lens surface data of Example 4 is shown in Table 10 below.
[Table 10]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 3.0000 0.3006 1.54470 56 2.625
3 * -29.8652 0.0500 2.517
4 * 52.0943 0.7384 1.54470 56 2.537
5 * -7.7991 0.1000 2.357
STO INFINITY -0.0500 2.258
7 * 1.7513 0.1500 1.63469 23.9 2.203
8 * 1.1130 0.3881 2.204
9 FS INFINITY 0.0700 2.220
10 * 8.5883 0.5707 1.54470 56 2.478
11 * -5.9776 0.1525 2.652
12 * -10.6927 0.3030 1.63469 23.9 2.807
13 * 17.6055 0.3879 3.158
14 * 3.2081 0.5334 1.54470 56 3.536
15 * -3.1457 0.5565 3.879
16 * -88.2601 0.3275 1.54470 56 4.705
17 * 1.4022 0.3000 5.313
18 INFINITY 0.1100 1.51633 64.1 5.646
19 INFINITY 0.3114

The aspherical coefficients of the lens surfaces of Example 4 are shown in Table 11 below.
[Table 11]
Second side
K = 2.11148e + 000, A4 = -2.95136e-002, A6 = 3.41717e-004,
A8 = 1.75787e-002, A10 = -5.43560e-003, A12 = 2.86848e-003,
A14 = -1.08971e-003
Third side
K = 0.00000e + 000, A4 = 5.74093e-002, A6 = 1.42162e-002,
A8 = 6.36900e-003, A10 = 3.22404e-003
4th page
K = 0.00000e + 000, A4 = 1.03021e-001, A6 = -1.42099e-002,
A8 = 7.97392e-003, A10 = -2.03644e-003, A12 = -1.30793e-003,
A14 = 1.07559e-003
5th page
K = 5.54924e + 000, A4 = 1.36177e-001, A6 = -1.73239e-001,
A8 = 1.46216e-001, A10 = -8.23902e-002, A12 = 2.76774e-002,
A14 = -4.86281e-003
7th page
K = -1.59241e + 001, A4 = -9.35509e-003, A6 = -5.26647e-002,
A8 = 3.17607e-002, A10 = -1.46649e-002, A12 = 6.11984e-003,
A14 = -3.54185e-003
8th page
K = -6.33742e + 000, A3 = -1.03631e-004, A4 = -2.05910e-002,
A5 = 2.44461e-003, A6 = 5.53165e-002, A8 = -1.41665e-001,
A10 = 1.68385e-001, A12 = -1.04094e-001, A14 = 2.61596e-002
10th page
K = 3.16638e + 001, A3 = -2.05322e-002, A4 = 7.70636e-002,
A5 = -2.31548e-001, A6 = 2.25677e-001, A8 = -1.68054e-001,
A10 = 1.33867e-001, A12 = -8.05820e-002, A14 = 2.16353e-002
11th page
K = -7.04758e + 000, A3 = 2.11213e-002, A4 = -1.65440e-001,
A5 = 9.70462e-002, A6 = -5.78489e-002, A8 = 2.33043e-002,
A10 = -9.33734e-003, A12 = 7.06252e-004
12th page
K = 5.61667e + 001, A3 = 7.53586e-002, A4 = -4.84332e-001,
A5 = 4.17171e-001, A6 = -1.98178e-001, A8 = 1.00749e-001,
A10 = -2.87920e-002, A12 = 1.60783e-003
Side 13
K = -5.95526e + 001, A3 = 5.00362e-002, A4 = -3.74655e-001,
A5 = 1.89754e-001, A6 = -1.88143e-003, A8 = 4.26196e-003,
A10 = 9.01876e-004, A12 = -1.34422e-003, A14 = 2.14891e-005
14th page
K = -3.79129e + 000, A3 = 1.28434e-003, A4 = 1.60638e-002,
A5 = -1.04100e-001, A6 = 6.97150e-002, A8 = -3.46793e-002,
A10 = 1.38857e-002, A12 = -2.90033e-003, A14 = 2.33414e-004
15th page
K = -1.78695e + 000, A3 = -6.95183e-003, A4 = 1.02116e-001,
A5 = -3.11562e-002, A6 = -3.29689e-002, A8 = -6.06059e-003,
A10 = 7.19149e-003, A12 = -1.27079e-003, A14 = 5.41600e-005
16th page
K = 8.00000e + 001, A3 = -5.30569e-002, A4 = -2.41895e-001,
A5 = 8.00129e-002, A6 = 3.81682e-002, A8 = -5.01910e-003,
A10 = -6.00123e-004, A12 = 1.46593e-004, A14 = -7.72897e-006
17th page
K = -3.27599e + 000, A3 = -7.07506e-002, A4 = -1.74522e-001,
A5 = 1.43329e-001, A6 = -3.06257e-002, A8 = 1.78898e-005,
A10 = -9.87526e-005, A12 = 2.07509e-005, A14 = -7.30726e-007

The characteristics of the imaging lens 10 of Example 4 are listed below.
FL 3.746
Fno 1.43
w 75.42
Ymax 2.921
BF 0.721
TL 5.300
BFa 0.684
TLa 5.263

The single lens data of Example 4 is shown in Table 12 below.
[Table 12]
Elem Surfs Focal Length Diameter
1 2- 3 5.0211 2.625
2 4--5 12.5080 2.537
3 7-8 -5.2952 2.204
4 10-11 6.5611 2.652
5 12-13 -10.4379 3.158
6 14-15 3.0049 3.879
7 16-17 -2.5307 5.313

  FIG. 11 is a cross-sectional view of the imaging lens 14 and the like of the fourth embodiment. The imaging lens 14 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a positive refractive power around the optical axis AX. An approximately plano-convex second lens L2 having a loose convex surface facing the object side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and the periphery of the optical axis AX And a biconvex fourth lens L4 having a positive refractive power, a biconcave fifth lens L5 having a negative refractive power around the optical axis AX, and a biconvex having a positive refractive power around the optical axis AX. A sixth lens L6 and a substantially plano-concave seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2, L3. That is, the second diaphragm member FS2 is arranged as the aperture diaphragm AS on the object side of the third lens L3. A light-shielding stop FS is disposed between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. Specifically, the first diaphragm member FS1 is disposed on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Example 5
The lens surface data of Example 5 is shown in Table 13 below.
[Table 13]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.750
2 * 2.8425 0.2876 1.54470 56 2.625
3 * 10.5346 0.0500 2.535
4 * 4.1054 0.5861 1.54470 56 2.552
5 * -20.5818 0.0500 2.441
STO INFINITY 0.0000 2.407
7 * 1.6442 0.1588 1.64250 22.5 2.260
8 * 1.0955 0.3814 2.070
9 FS INFINITY 0.1500 2.100
10 * 10.4374 0.4135 1.54470 56 2.228
11 * -10.8612 0.2050 2.437
12 * -11.5154 0.3240 1.64250 22.5 2.709
13 * -70.1387 0.2749 3.121
14 * 6.5446 0.6436 1.54470 56 3.323
15 * -2.0481 0.2494 3.827
16 * 3.2631 0.3159 1.54470 56 4.669
17 * 0.9055 0.7000 5.123
18 INFINITY 0.1100 1.51633 64.1 6.000
19 INFINITY 0.1034

The aspheric coefficients of the lens surfaces of Example 5 are shown in Table 14 below.
[Table 14]
Second side
K = 2.45933e + 000, A4 = -5.64840e-002, A6 = 1.23880e-003,
A8 = 1.40164e-002, A10 = -8.15057e-003, A12 = 4.49083e-003,
A14 = -1.20273e-003
Third side
K = 0.00000e + 000, A4 = 2.84945e-002, A6 = -1.54521e-002,
A8 = 1.61739e-002, A10 = 7.11214e-004
4th page
K = 0.00000e + 000, A4 = 1.18964e-001, A6 = -4.85843e-002,
A8 = 1.67136e-002, A10 = 2.23414e-003, A12 = -3.21920e-003,
A14 = 9.58706e-004
5th page
K = 8.00000e + 001, A4 = 1.21081e-001, A6 = -1.57295e-001,
A8 = 1.19491e-001, A10 = -6.71167e-002, A12 = 2.64905e-002,
A14 = -4.86280e-003
7th page
K = -1.19198e + 001, A4 = -2.43944e-002, A6 = -6.54265e-002,
A8 = 5.52093e-002, A10 = -2.07627e-002, A12 = 1.00626e-002,
A14 = -3.54185e-003
8th page
K = -5.36212e + 000, A3 = 2.52605e-003, A4 = -3.36521e-002,
A5 = 3.46266e-003, A6 = 6.34426e-002, A8 = -1.32146e-001,
A10 = 1.68730e-001, A12 = -1.03133e-001, A14 = 2.59965e-002
10th page
K = 7.30826e + 001, A3 = -2.75937e-002, A4 = 7.23297e-002,
A5 = -2.57373e-001, A6 = 2.38197e-001, A8 = -1.73011e-001,
A10 = 1.25314e-001, A12 = -8.02041e-002, A14 = 2.07391e-002
11th page
K = 5.75496e + 001, A3 = 3.22475e-002, A4 = -1.90882e-001,
A5 = 1.10433e-001, A6 = -6.08357e-002, A8 = 2.03234e-002,
A10 = -1.29615e-002, A12 = 1.67482e-003
12th page
K = 7.03938e + 001, A3 = 1.12370e-001, A4 = -4.69857e-001,
A5 = 4.03250e-001, A6 = -2.22030e-001, A8 = 1.06297e-001,
A10 = -1.93140e-002, A12 = -2.51197e-003
Side 13
K = -8.00000e + 001, A3 = 9.49994e-002, A4 = -3.41451e-001,
A5 = 1.44129e-001, A6 = -1.14642e-002, A8 = 1.64381e-002,
A10 = 1.97668e-003, A12 = -2.48220e-003, A14 = -3.75961e-005
14th page
K = 1.38482e + 001, A3 = 1.96397e-002, A4 = -2.70337e-003,
A5 = -1.09896e-001, A6 = 5.58340e-002, A8 = -3.04191e-002,
A10 = 1.60292e-002, A12 = -4.53716e-003, A14 = 4.97797e-004
15th page
K = -1.21948e + 001, A3 = -1.10948e-001, A4 = 1.38121e-001,
A5 = -4.02449e-002, A6 = -3.54958e-002, A8 = -1.49037e-003,
A10 = 7.19664e-003, A12 = -1.65384e-003, A14 = 1.08405e-004
16th page
K = -8.00000e + 001, A3 = -1.94711e-001, A4 = -1.30937e-001,
A5 = 7.42678e-002, A6 = 2.86079e-002, A8 = -5.14203e-003,
A10 = -4.66063e-004, A12 = 1.40143e-004, A14 = -7.90282e-006
17th page
K = -5.17425e + 000, A3 = -1.19250e-001, A4 = -8.11730e-002,
A5 = 1.10963e-001, A6 = -3.49510e-002, A8 = 1.10574e-003,
A10 = -1.27659e-004, A12 = 1.59180e-005, A14 = -2.25568e-007

The characteristics of the imaging lens 10 of Example 5 are listed below.
FL 3.785
Fno 1.44
w 74.14
Ymax 2.921
BF 0.913
TL 5.003
BFa 0.876
TLa 4.966

The single lens data of Example 5 is shown in Table 15 below.
[Table 15]
Elem Surfs Focal Length Diameter
1 2- 3 7.0538 2.625
2 4--5 6.3366 2.552
3 7-8 -5.7618 2.260
4 10-11 9.8388 2.437
5 12-13 -21.4899 3.121
6 14-15 2.9415 3.827
7 16-17 -2.4151 5.123

  FIG. 13 is a cross-sectional view of the imaging lens 15 and the like according to the fifth embodiment. The imaging lens 15 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and a positive lens around the optical axis AX. A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having a weak negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2, L3. That is, the second diaphragm member FS2 is arranged as the aperture diaphragm AS on the object side of the third lens L3. A light-shielding stop FS is disposed between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. Specifically, the first diaphragm member FS1 is disposed on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Example 6
The lens surface data of Example 6 is shown in Table 16 below.
[Table 16]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 2.6382 0.3151 1.54470 56 2.625
3 * 13.0451 0.0500 2.560
4 * 4.1532 0.6042 1.54470 56 2.565
5 * -24.1768 0.1000 2.447
STO INFINITY -0.0500 2.343
7 * 1.7267 0.1554 1.64250 22.5 2.235
8 * 1.1061 0.4257 2.003
9 FS INFINITY 0.1500 2.080
10 * 10.8150 0.4020 1.54470 56 2.299
11 * -17.4966 0.1725 2.560
12 * -13.0397 0.2500 1.64250 22.5 2.833
13 * -24.3648 0.3079 3.096
14 * 7.5523 0.4919 1.54470 56 3.395
15 * -2.1375 0.2544 3.795
16 * 3.0841 0.3093 1.54470 56 4.618
17 * 0.9108 0.7000 5.004
18 INFINITY 0.1100 1.51633 64.1 5.757
19 INFINITY 0.1009

Table 17 below shows the aspheric coefficients of the lens surfaces of Example 6.
[Table 17]
Second side
K = 2.03116e + 000, A4 = -6.56064e-002, A6 = -9.47667e-003,
A8 = 1.29845e-002, A10 = -7.34348e-003, A12 = 5.03976e-003,
A14 = -1.49643e-003
Third side
K = 0.00000e + 000, A4 = 1.62399e-002, A6 = -2.17529e-002,
A8 = 1.59065e-002, A10 = 2.76162e-004
4th page
K = 0.00000e + 000, A4 = 1.16481e-001, A6 = -4.19262e-002,
A8 = 1.62885e-002, A10 = 3.62132e-004, A12 = -3.16641e-003,
A14 = 1.15655e-003
5th page
K = 8.00000e + 001, A4 = 1.15928e-001, A6 = -1.58272e-001,
A8 = 1.18731e-001, A10 = -6.70291e-002, A12 = 2.67578e-002,
A14 = -4.86297e-003
7th page
K = -1.36106e + 001, A4 = -3.54561e-002, A6 = -4.45993e-002,
A8 = 5.44551e-002, A10 = -2.50577e-002, A12 = 1.13259e-002,
A14 = -3.54209e-003
8th page
K = -5.67795e + 000, A3 = 6.93725e-003, A4 = -2.87158e-002,
A5 = 9.76236e-003, A6 = 7.14634e-002, A8 = -1.22123e-001,
A10 = 1.67693e-001, A12 = -1.06336e-001, A14 = 2.79996e-002
10th page
K = 2.01392e + 001, A3 = -2.21876e-002, A4 = 6.94020e-002,
A5 = -2.49838e-001, A6 = 2.42710e-001, A8 = -1.73201e-001,
A10 = 1.32080e-001, A12 = -7.56022e-002, A14 = 1.88769e-002
11th page
K = -8.00000e + 001, A3 = 3.74533e-002, A4 = -1.82862e-001,
A5 = 1.09505e-001, A6 = -6.57678e-002, A8 = 2.57443e-002,
A10 = -1.46604e-002, A12 = 2.96350e-003
12th page
K = 7.84932e + 001, A3 = 1.18753e-001, A4 = -4.75527e-001,
A5 = 4.01828e-001, A6 = -2.26950e-001, A8 = 1.02720e-001,
A10 = -1.77362e-002, A12 = -2.10829e-003
Side 13
K = -7.85381e + 001, A3 = 9.13893e-002, A4 = -3.34887e-001,
A5 = 1.27675e-001, A6 = -1.43744e-002, A8 = 2.16811e-002,
A10 = 2.17996e-003, A12 = -2.93847e-003, A14 = 1.39523e-005
14th page
K = 1.75964e + 001, A3 = 1.86480e-002, A4 = 2.60090e-002,
A5 = -1.07705e-001, A6 = 4.43507e-002, A8 = -2.90545e-002,
A10 = 1.63260e-002, A12 = -4.67132e-003, A14 = 5.24325e-004
15th page
K = -8.96742e + 000, A3 = -1.02219e-001, A4 = 1.95108e-001,
A5 = -7.87731e-002, A6 = -3.64803e-002, A8 = 1.32953e-003,
A10 = 6.95241e-003, A12 = -1.74240e-003, A14 = 1.25095e-004
16th page
K = -7.99995e + 001, A3 = -2.00086e-001, A4 = -1.29172e-001,
A5 = 7.80963e-002, A6 = 2.75812e-002, A8 = -5.40552e-003,
A10 = -4.50625e-004, A12 = 1.45536e-004, A14 = -8.37510e-006
17th page
K = -5.18659e + 000, A3 = -1.42142e-001, A4 = -5.81749e-002,
A5 = 1.01091e-001, A6 = -3.31283e-002, A8 = 7.74213e-004,
A10 = -9.90054e-005, A12 = 1.39436e-005, A14 = 2.40490e-007

The characteristics of the imaging lens 10 of Example 6 are listed below.
FL 3.786
Fno 1.44
w 74.37
Ymax 2.921
BF 0.911
TL 4.849
BFa 0.873
TLa 4.812

The single lens data of Example 6 is shown in Table 18 below.
[Table 18]
Elem Surfs Focal Length Diameter
1 2- 3 6.0072 2.625
2 4- 5 6.5563 2.565
3 7-8 -5.3095 2.235
4 10-11 12.3321 2.560
5 12-13 -44.0432 3.096
6 14-15 3.1143 3.795
7 16-17 -2.4981 5.004

  FIG. 15 is a cross-sectional view of the imaging lens 16 and the like according to the sixth embodiment. The imaging lens 16 includes, in order from the object side, a first meniscus lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and a positive lens around the optical axis AX. A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having a weak negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2, L3. That is, the second diaphragm member FS2 is arranged as the aperture diaphragm AS on the object side of the third lens L3. A light-shielding stop FS is disposed between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. Specifically, the first diaphragm member FS1 is disposed on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Example 7
The lens surface data of Example 7 is shown in Table 19 below.
[Table 19]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.800
2 * 3.3015 0.2057 1.54470 56 2.485
3 * 11.1318 0.2981 2.325
STO INFINITY -0.2481 2.333
5 * 4.2322 0.9081 1.54470 56 2.344
6 * -31.4680 0.0500 2.103
7 * 1.8190 0.1500 1.64250 22.5 2.020
8 * 1.2154 0.3467 2.148
9 FS INFINITY 0.0500 2.280
10 * 7.4298 0.4301 1.54470 56 2.340
11 * -10.1882 0.1490 2.516
12 * -11.5232 0.2000 1.64250 22.5 2.663
13 * -25.8224 0.4341 2.899
14 * 4.9352 0.4434 1.54470 56 3.451
15 * -3.0928 0.3600 3.842
16 * 3.1634 0.3129 1.54470 56 4.697
17 * 0.9811 0.4000 5.044
18 INFINITY 0.1100 1.51633 64.1 6.000
19 INFINITY 0.4000

Table 20 below shows the aspheric coefficients of the lens surfaces of Example 7.
[Table 20]
Second side
K = 3.36105e + 000, A4 = -7.94870e-002, A6 = 2.07951e-002,
A8 = 1.39213e-002, A10 = -9.27126e-003, A12 = 3.54083e-003,
A14 = -8.51627e-004
Third side
K = 0.00000e + 000, A4 = 3.05799e-002, A6 = -1.56270e-002,
A8 = 2.20118e-002, A10 = -1.97733e-003
5th page
K = 0.00000e + 000, A4 = 1.23196e-001, A6 = -5.51921e-002,
A8 = 1.56997e-002, A10 = 4.24602e-003, A12 = -3.69900e-003,
A14 = 9.01883e-004
6th surface K = -1.06179e + 001, A4 = 9.30475e-002, A6 = -1.54311e-001,
A8 = 1.20759e-001, A10 = -6.73988e-002, A12 = 2.60256e-002,
A14 = -4.86280e-003
7th page
K = -1.35160e + 001, A4 = -2.80945e-002, A6 = -9.17061e-002,
A8 = 5.92051e-002, A10 = -1.44739e-002, A12 = 6.11980e-003,
A14 = -3.54185e-003
8th page
K = -5.86017e + 000, A3 = -3.27589e-003, A4 = -3.49476e-002,
A5 = -6.35227e-003, A6 = 5.37366e-002, A8 = -1.28642e-001,
A10 = 1.71627e-001, A12 = -1.06865e-001, A14 = 2.58046e-002
10th page
K = 3.42888e + 001, A3 = -1.82373e-002, A4 = 6.47450e-002,
A5 = -2.59149e-001, A6 = 2.56719e-001, A8 = -1.73502e-001,
A10 = 1.24035e-001, A12 = -7.23615e-002, A14 = 1.77241e-002
11th page
K = 2.26036e + 001, A3 = 4.81347e-002, A4 = -1.87755e-001,
A5 = 9.87501e-002, A6 = -5.65569e-002, A8 = 3.33831e-002,
A10 = -1.47994e-002, A12 = 1.32210e-003
12th page
K = 7.28701e + 001, A3 = 1.00275e-001, A4 = -4.90404e-001,
A5 = 3.98660e-001, A6 = -2.02854e-001, A8 = 1.13571e-001,
A10 = -2.30865e-002, A12 = -2.84567e-003
Side 13
K = -8.00000e + 001, A3 = 5.15310e-002, A4 = -3.51709e-001,
A5 = 1.76313e-001, A6 = -1.08328e-002, A8 = 1.33332e-002,
A10 = 3.67075e-003, A12 = -2.83428e-003, A14 = -2.60794e-004
14th page
K = 4.57265e + 000, A3 = -2.41068e-002, A4 = 5.40067e-002,
A5 = -1.29959e-001, A6 = 7.31899e-002, A8 = -3.36364e-002,
A10 = 1.41972e-002, A12 = -4.00626e-003, A14 = 5.31717e-004
15th page
K = -4.25601e + 001, A3 = -1.19694e-001, A4 = 1.11706e-001,
A5 = -4.60858e-003, A6 = -3.48103e-002, A8 = -6.06970e-003,
A10 = 7.22230e-003, A12 = -1.47390e-003, A14 = 8.72814e-005
16th page
K = -4.85199e + 001, A3 = -1.90054e-001, A4 = -1.36306e-001,
A5 = 7.22141e-002, A6 = 2.95063e-002, A8 = -4.86806e-003,
A10 = -4.66772e-004, A12 = 1.31777e-004, A14 = -7.17900e-006
17th page
K = -5.31135e + 000, A3 = -1.06034e-001, A4 = -8.68173e-002,
A5 = 1.09683e-001, A6 = -3.44811e-002, A8 = 1.51053e-003,
A10 = -1.69982e-004, A12 = 4.55135e-006, A14 = 1.54660e-006

The characteristics of the imaging lens 10 of Example 7 are listed below.
FL 3.778
Fno 1.60
w 75.42
Ymax 2.921
BF 0.910
TL 5.000
BFa 0.873
TLa 4.963

The single lens data of Example 7 is shown in Table 21 below.
[Table 21]
Elem Surfs Focal Length Diameter
1 2- 3 8.5376 2.485
2 5- 6 6.9107 2.344
3 7-8 -6.3141 2.148
4 10-11 7.9564 2.516
5 12-13 -32.5660 2.899
6 14-15 3.5599 3.842
7 16-17 -2.7498 5.044

  FIG. 17 is a cross-sectional view of the imaging lens 17 and the like of the seventh embodiment. The imaging lens 17 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a concave surface facing the image side, and a positive lens around the optical axis AX. A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having a weak negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2. A light-shielding stop FS is disposed between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. Specifically, the first diaphragm member FS1 is disposed on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Example 8
The lens surface data of Example 8 is shown in Table 22 below.
[Table 22]
Surface number rd nd vd eff.dia.
STO INFINITY 0.0000 2.625
2 * 12.7631 0.2435 1.54470 56 2.625
3 * -5.4843 0.0500 2.574
4 * 9.0345 0.5529 1.54470 56 2.650
5 * -12.5803 0.0500 2.597
6 * 1.3123 0.1512 1.63469 23.9 2.362
7 * 0.9809 0.4167 2.281
8 FS INFINITY 0.0500 2.340
9 * 7.7483 0.5607 1.54470 56 2.403
10 * -6.9181 0.1807 2.621
11 * -12.6546 0.2029 1.63469 23.9 2.826
12 * 7.7098 0.2989 3.080
13 * 3.2773 0.7704 1.54470 56 3.394
14 * -2.7895 0.3447 3.860
15 * 1.6964 0.3174 1.54470 56 4.780
16 * 0.8038 0.7000 5.268
17 INFINITY 0.1100 1.51633 64.1 5.753
18 INFINITY 0.1000

Table 23 below shows the aspheric coefficients of the lens surfaces of Example 8.
[Table 23]
Second side
K = -8.00000e + 001, A4 = -7.48850e-002, A6 = 6.33439e-002,
A8 = 6.15877e-003, A10 = -1.76732e-002, A12 = 7.02102e-003,
A14 = -1.09000e-003
Third side
K = 0.00000e + 000, A4 = 4.85267e-002, A6 = 8.42381e-003,
A8 = 1.31801e-002, A10 = -4.45043e-003
4th page
K = 0.00000e + 000, A4 = 1.55158e-001, A6 = -8.42838e-002,
A8 = 2.37956e-002, A10 = 4.07474e-003, A12 = -4.23186e-003,
A14 = 7.28622e-004
5th page
K = 3.67867e + 001, A4 = 9.08050e-002, A6 = -1.45772e-001,
A8 = 1.28885e-001, A10 = -7.77015e-002, A12 = 2.89308e-002,
A14 = -4.86280e-003
6th page
K = -6.97649e + 000, A4 = 1.05634e-002, A6 = -1.00130e-001,
A8 = 5.43288e-002, A10 = -1.85670e-002, A12 = 9.55016e-003,
A14 = -3.54185e-003
7th page
K = -3.94862e + 000, A3 = -2.59698e-003, A4 = -2.62087e-002,
A5 = 6.06741e-003, A6 = 5.23030e-002, A8 = -1.57099e-001,
A10 = 1.72952e-001, A12 = -9.17431e-002, A14 = 1.92141e-002
9th page
K = 3.66418e + 001, A3 = -1.45238e-002, A4 = 7.28277e-002,
A5 = -2.43294e-001, A6 = 2.47363e-001, A8 = -1.77780e-001,
A10 = 1.33870e-001, A12 = -7.54842e-002, A14 = 1.58978e-002
10th page
K = -6.20010e + 001, A3 = 5.12275e-002, A4 = -1.72624e-001,
A5 = 9.19663e-002, A6 = -6.96915e-002, A8 = 2.91927e-002,
A10 = -1.07735e-002, A12 = 2.59681e-004
11th page
K = 7.72015e + 001, A3 = 1.13745e-001, A4 = -4.78981e-001,
A5 = 3.97688e-001, A6 = -2.10616e-001, A8 = 1.05312e-001,
A10 = -2.45212e-002, A12 = 3.26595e-004
12th page
K = 2.18339e + 001, A3 = 5.27999e-002, A4 = -3.67919e-001,
A5 = 1.73977e-001, A6 = -9.16990e-003, A8 = 1.33268e-002,
A10 = 2.47047e-003, A12 = -2.98596e-003, A14 = 1.55616e-004
Side 13
K = 2.33931e + 000, A3 = -2.71900e-002, A4 = 2.93736e-002,
A5 = -1.34640e-001, A6 = 8.36348e-002, A8 = -3.59132e-002,
A10 = 1.47597e-002, A12 = -3.49934e-003, A14 = 3.03570e-004
14th page
K = -1.34903e + 001, A3 = -9.56336e-002, A4 = 8.04709e-002,
A5 = 3.58988e-003, A6 = -3.11515e-002, A8 = -6.77177e-003,
A10 = 7.14834e-003, A12 = -1.42848e-003, A14 = 8.21393e-005
15th page
K = -1.35283e + 001, A3 = -2.18794e-001, A4 = -1.36817e-001,
A5 = 7.20456e-002, A6 = 3.00213e-002, A8 = -4.72429e-003,
A10 = -4.67307e-004, A12 = 1.25999e-004, A14 = -6.74112e-006
16th page
K = -4.17944e + 000, A3 = -1.21792e-001, A4 = -8.51573e-002,
A5 = 1.12526e-001, A6 = -3.48332e-002, A8 = 1.48839e-003,
A10 = -1.36324e-004, A12 = 7.15732e-006, A14 = 3.36690e-007

The characteristics of the imaging lens 10 of Example 8 are listed below.
FL 3.474
Fno 1.32
w 79.98
Ymax 2.921
BF 0.910
TL 5.100
BFa 0.873
TLa 5.063

The single lens data of Example 8 is shown in Table 24 below.
[Table 24]
Elem Surfs Focal Length Diameter
1 2- 3 7.0756 2.625
2 4- 5 9.7414 2.650
3 6- 7 -7.4386 2.362
4 9-10 6.8015 2.621
5 11-12 -7.5194 3.080
6 13-14 2.8962 3.860
7 15-16 -3.2066 5.268

  FIG. 19 is a cross-sectional view of the imaging lens 18 and the like of the eighth embodiment. The imaging lens 18 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a biconvex second lens L2 having a positive refractive power around the optical axis AX. A meniscus third lens L3 having a negative refractive power around the optical axis AX and having a concave surface facing the image side, a biconvex fourth lens L4 having a positive refractive power around the optical axis AX, and the optical axis AX Bi-concave fifth lens L5 having negative refractive power around the periphery, biconvex sixth lens L6 having positive refractive power around the optical axis AX, and an image having negative refractive power around the optical axis AX And a meniscus seventh lens L7 having a concave surface on the side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1. A light-shielding stop FS is disposed between the third and fourth lenses L3 and L4. That is, the first diaphragm member FS1 is disposed as the aperture diaphragm AS on the object side of the first lens L1, and the second diaphragm member FS2 is disposed on the image side of the third lens L3.

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

Table 25 below summarizes the values of Examples 1 to 8 corresponding to the conditional expressions (1) to (6) for reference.
[Table 25]

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

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

  DESCRIPTION OF SYMBOLS 10, 11-18 ... Imaging lens, 50 ... Camera module, 51 ... Imaging device, 100 ... Imaging device, 300 ... Portable terminal, AX ... Optical axis, L1-L7 ... Lens, AS ... Aperture stop, FS ... Shading stop, FS1, FS2 ... diaphragm member

Claims (13)

In order from the object side, a positive first lens, a positive second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens,
The image side surface of the seventh lens is aspheric, and has an extreme value within an effective diameter other than the center,
An imaging lens that satisfies the following conditional expression.
15.0 <θSp <50.0 (1)
However,
θSp: Maximum surface angle within the effective diameter of the object side surface of the second lens   The imaging lens according to claim 1, wherein the seventh lens has a concave image side surface in the vicinity of the optical axis and is a negative lens.   The imaging lens according to claim 1, further comprising an aperture stop closer to the object side than the fourth lens.   The imaging lens according to any one of claims 1 to 3, wherein the third lens is a negative lens having a concave surface facing the image side.   The imaging lens according to any one of claims 1 to 4, wherein the first lens and the second lens have a convex surface directed toward the object side. The first lens has a first diaphragm member having a predetermined opening on the object side,
The third lens has a second aperture member having a predetermined aperture on at least one of the object side and the image side;
The imaging lens according to claim 1, wherein the imaging lens satisfies the following conditional expression.
0.70 <Φs3 / Φs1 <1.00 (2)
However,
Φs1: Opening diameter of the first diaphragm member Φs3: Opening diameter of the second diaphragm member The imaging lens according to any one of claims 1 to 6, which satisfies the following conditional expression.
1.0 <ΦL1 / ΦL3 <1.4 (3)
However,
ΦL1: The larger effective diameter of the object side surface and the image side surface of the first lens ΦL3: The larger effective diameter of the object side surface and the image side surface of the third lens The imaging lens according to any one of claims 1 to 7, which satisfies the following conditional expression.
0.2 <f1 / f2 <1.4 (4)
However,
f1: Focal length of the first lens f2: Focal length of the second lens The imaging lens according to claim 1, wherein the imaging lens satisfies the following conditional expression.
−1.0 <f12 / f3 <−0.4 (5)
However,
f12: Composite focal length of the first lens and the second lens f3: Focal length of the third lens The imaging lens according to any one of claims 1 to 9, wherein the fourth lens is a positive lens and satisfies the following conditional expression.
1.5 <f4 / f <5.0 (6)
However,
f4: focal length of the fourth lens f: focal length of the entire imaging lens system   The imaging lens according to any one of claims 1 to 10, further comprising an optical element having substantially no power.   An imaging device comprising: the imaging lens according to claim 1; and the imaging element.   A portable terminal comprising the imaging device according to claim 12.

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