JP2013246217A - Imaging lens, imaging apparatus, and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging lens, composed of five lenses, which is a wide angle lens in which various aberrations are satisfactory corrected despite its size smaller than a conventional type, and which has brightness with an F number of 2.6 or smaller.SOLUTION: An imaging lens comprises, in order from an object side, a first lens L1 of positive refractive power, the convex face of which is oriented on the image side; a second lens L2; a third lens L3, a fourth lens L4 of positive refractive power; and a fifth lens L5 of negative refractive power. At least one of the faces of each of the second lens L2 and third lens L3 is aspheric. At least one face of the fifth lens L5 is aspheric and has an inflection point at a position other than the point at which it intersects the optical axis. The imaging lens 10 satisfies the following conditional formulae (1) to (4): (1) 0.14<(r1+r2)/(r1-r2)<3; (2) 0<f/f45<5; (3) 0.015<d4/L<0.25; and (4) 2ω>76°.

Description

  The present invention relates to a small-sized imaging lens having a wide field angle of view, which uses a CCD-type image sensor or a CMOS-type image sensor, and an imaging device using the imaging lens.

  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. In addition, there is an increasing demand for further downsizing and higher performance of imaging lenses mounted on these imaging apparatuses. As an imaging lens for such a use, an imaging lens having a five-lens configuration has been proposed because it can be improved in performance as compared with a lens having three or four lenses.

  As the five-lens imaging lens, a first lens having a positive refractive power, a second lens, a third lens, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power in order from the object side. An imaging lens including a lens is disclosed (for example, see Patent Documents 1 to 4).

  However, the imaging lenses described in Patent Documents 1 to 4 have a shooting angle of view of 75 degrees or less, and the effect of various aberrations, particularly the effect of coma aberration, becomes large when the angle of view is increased beyond this. Although it is small in size, high resolution cannot be obtained.

  Further, the imaging lenses described in Patent Documents 2 to 4 have an F value of about 2.8, and are required to have an F value that can provide high resolution in a portable terminal in which the pixels are increasingly thinned. Yes.

JP 2012-8490 A International Publication No. 2011/004467 International Publication No. 2011/021271 International Publication No. 2011/027690

  The present invention has been made in view of the above-described background art, and is a wide-angle lens in which various aberrations are favorably corrected while being smaller than the conventional type, and the F value is 2.6 or less. It is an object of the present invention to provide a five-lens imaging lens having the following brightness, an imaging device using the imaging lens, and the like.

Here, although it is a scale of a small image pickup lens, the present invention aims at downsizing at a level satisfying the following conditional expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
L / 2Y <2 (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 flat 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 portion The value of L is calculated after the air conversion distance.

As for the value L / 2Y of the conditional expression (7), it is more desirable to satisfy the following conditional expression.
L / 2Y <1.5 (7) '
More preferably, the range of the following formula is good.
L / 2Y <1.0 (7) "

In order to achieve the above object, an imaging lens according to the present invention is an imaging lens for forming a subject image on a photoelectric conversion unit of an imaging device, and has a positive refractive power in order from the object side and has an image side. A first lens having a convex surface on the surface, a second lens having an aspheric shape on at least one surface, a third lens having an aspheric shape on at least one surface, and a fourth lens having a positive refractive power A fifth lens having a negative refractive power in the vicinity of the optical axis, wherein at least one surface of the fifth lens is aspherical and has an inflection point at a position other than the intersection with the optical axis. And the following conditional expression is satisfied.
0.14 <(r1 + r2) / (r1-r2) <3 (1)
0 <f / f45 <5 (2)
0.015 <d4 / L <0.25 (3)
2ω> 76 ° (4)
However,
r1: radius of curvature of the first lens object side surface r2: radius of curvature of the first lens image side surface f: focal length of the entire imaging lens system f45: combined focal length of the fourth lens and the fifth lens d4: second lens and first lens Distance on the optical axis with the three lenses L: Distance on the optical axis from the most object-side lens surface to the image-side focal point of the entire imaging lens system (parallel plate is the air equivalent length)
ω: Maximum half angle of view

The imaging lens has, as a basic configuration for obtaining a small imaging lens with good aberration correction, in order from the object side, (a) a first lens having a positive refractive power and a convex surface facing the image side, (B) a second lens having an aspherical shape on at least one surface, (c) a third lens having an aspherical shape on at least one surface, (d) a fourth lens having a positive refractive power, (e) A fifth lens having negative refractive power in the vicinity of the optical axis. Here, “near the optical axis” means a central region within 10% of the lens outer diameter, for example.
In general, a so-called telephoto type lens configuration in which a positive refracting power is disposed on the most object side of the imaging lens and a negative refracting power is disposed on the most image side is advantageous in reducing the overall length of the imaging lens. Although it is a structure, it can be said that it is a disadvantageous structure for widening the angle. On the other hand, a so-called retrofocus type lens configuration in which negative refracting power is arranged on the most object side of the imaging lens and positive refracting power is arranged on the most image side is an advantageous configuration for widening the imaging lens. It can be said that this is a disadvantageous configuration for reducing the overall lens length. In the present invention, a first lens having a positive refractive power and a fifth lens having a negative refractive power are arranged to reduce the size by a telephoto type lens configuration, and the convex side faces the image side of the first lens toward the image side. A wide angle is realized by adopting a shape, more specifically, by arranging negative or weak positive refractive power on the object side surface and arranging a moderate positive refractive power stronger than these on the image side surface. .

Here, “the shape in which the convex surface faces the image side” for the first lens means that the surface position of the lens surface at the maximum effective diameter is located on the object side with respect to the surface vertex.
In addition, by arranging positive refractive power in the fourth lens, it is possible to prevent the incident angle of the peripheral rays incident on the fifth lens from jumping, so that the lens diameter of the fifth lens can be reduced and the imaging lens can be reduced in diameter. Is possible.
Furthermore, by making at least one surface of the fifth lens disposed closest to the image side an aspherical surface, various aberrations at the periphery of the screen can be corrected well. In addition, an aspherical shape with an inflection point at a position other than the intersection with the optical axis makes it easy to secure telecentric characteristics. Here, the “inflection point” is the lens cross section within the effective radius. In the shape curve, it is a point on the aspheric surface where the tangent plane of the aspherical vertex is a plane perpendicular to the optical axis.

Conditional expression (1) is a conditional expression for appropriately setting the shape of the first lens. The positive first lens has a shape in which the absolute value of the curvature radius of the object side surface is larger than the absolute value of the curvature radius of the image side surface or a concave surface facing the object side within the range of conditional expression (1). . Specifically, since the value (r1 + r2) / (r1−r2) is more than a certain positive value, a biconvex lens whose image side surface is near the optical axis and has a positive refractive power stronger than the object side surface, and the object side surface is the optical axis. Either a plano-convex lens that is a flat surface in the vicinity, or a meniscus lens that has a concave surface facing the object side in the vicinity of the optical axis.
When the value of conditional expression (1) is below the upper limit, the positive refractive power of the image side surface becomes too strong, and the principal point position of the imaging lens can be suppressed from moving toward the image side, which is advantageous for shortening the total optical length. It can be set as a simple structure. When the value of conditional expression (1) is larger than 1.0 and the concave surface is directed to the object side, the value of conditional expression (1) is less than the upper limit, so that the maximum effective diameter of the lens surface is obtained. Since the degree to which the surface position is located closer to the object side than the surface vertex can be suppressed, the overall length of the imaging lens can be shortened. Since the value of conditional expression (1) exceeds the lower limit, the curvature radius of the object side surface becomes too small and the angle of light incident on the lens surface can be prevented from increasing. Wide angle can be achieved.

As for the value (r1 + r2) / (r1-r2) of the conditional expression (1), it is more desirable to satisfy the following conditional expression.
0.25 <(r1 + r2) / (r1-r2) <2.5 (1) ′
As for the value (r1 + r2) / (r1-r2), it is more desirable to satisfy the following conditional expression.
0.40 <(r1 + r2) / (r1-r2) <2 (1) "

Conditional expression (2) is a conditional expression for appropriately setting the combined focal length of the fourth lens and the fifth lens to realize good aberration correction and widening of the angle. The imaging lens of the present invention has a negative refractive power from a positive refractive power that is relatively weak on the object side surface of the first lens by satisfying conditional expression (1). By satisfying conditional expression (2), the combined refractive power of the fourth lens and the fifth lens has a positive refractive power, so that the imaging lens has a configuration close to a retrofocus type. A wide-angle lens in which various off-axis aberrations such as field curvature and distortion are corrected well can be achieved.
Since the value of conditional expression (2) is below the upper limit, the combined refractive power of the fourth lens and the fifth lens becomes too strong, and the imaging lens is not too close to the retrofocus type than the telephoto type. It is possible to prevent the principal point of the optical system from approaching the image side and increase the back focus, and the overall length can be easily shortened. On the other hand, by exceeding the lower limit, the combined refractive power of the fourth lens and the fifth lens can maintain the positive refractive power, so that it is easy to satisfactorily correct off-axis aberrations such as field curvature and distortion. Become.

As for the value f / f45 of the conditional expression (2), it is more desirable to satisfy the following conditional expression.
0 <f / f45 <3 (2) ′
It is more desirable for the value f / f45 to satisfy the following conditional expression.
0 <f / f45 <2 (2) "

  Conditional expression (3) is a conditional expression that realizes shortening of the total length and good aberration correction by appropriately setting the distance on the optical axis between the second lens and the third lens. When the value of conditional expression (3) is less than the upper limit, an increase in the total length or an increase in the lens diameter can be suppressed. On the other hand, since the value of the conditional expression (3) exceeds the lower limit, the second lens and the third lens can be disposed at an appropriate distance, so that a difference in the height of the off-axis light beam passing through can be provided. Correction of coma becomes easy.

As for the value d4 / L of the conditional expression (3), it is more desirable to satisfy the following conditional expression.
0.025 <d4 / L <0.15 (3) ′
It is more desirable for the value d4 / L to satisfy the following conditional expression.
0.03 <d4 / L <0.10 (3) "

  Regarding conditional expression (4), the imaging lens can be widened by satisfying the range of conditional expression (4).

As for the value 2ω of the conditional expression (4), it is more desirable to satisfy the following conditional expression.
2ω> 77 ° (4) '

In a specific aspect or viewpoint of the present invention, in the imaging lens, the second lens has negative refractive power and satisfies the following conditional expression.
-2 <f / f2 <0 (5)
However,
f: Focal length of the entire imaging lens system f2: Focal length of the second lens

  Since the third lens has a negative refractive power, the negative refractive power can be relatively disposed on the object side in the entire imaging lens system, which is advantageous for widening the imaging lens.

  Conditional expression (5) is a conditional expression for achieving a wider angle and higher performance by appropriately setting the focal length of the second lens. When the value of conditional expression (5) is below the upper limit, the negative refractive power of the second lens can be prevented from becoming too weak, the negative refractive power can be maintained moderately, and chromatic aberration can be corrected well. Is possible. On the other hand, by exceeding the lower limit of the conditional expression (5), the negative refractive power of the second lens becomes too strong, and the principal point position of the imaging lens can be prevented from being arranged on the image side. Good telecentric characteristics can be obtained. Furthermore, coma and distortion generated in the second lens can be suppressed to a small level, and high performance can be achieved.

As for the value f / f2 of the conditional expression (5), it is more desirable to satisfy the following conditional expression.
-1.7 <f / f2 <0 (5) '
For the value f / f2, it is more desirable to satisfy the following conditional expression.
-1.5 <f / f2 <0 (5) "

In another aspect of the present invention, the following conditions are satisfied.
0.5 <f1 / f4 <3.0 (6)
However,
f1: Focal length of the first lens f4: Focal length of the fourth lens

  Conditional expression (6) sets the ratio between the focal length of the first lens and the focal length of the fourth lens, which share the positive refractive power of the entire imaging lens system, to shorten the overall length and to provide good aberrations. It is a conditional expression that realizes correction. When the value of conditional expression (6) is less than the upper limit, it is possible to prevent the focal length of the first lens from increasing and the focal length of the fourth lens from decreasing, so that the principal point of the optical system is placed on the object side and the back Since it is possible to prevent the focus from becoming long, the total lens length can be shortened. Further, it is possible to satisfactorily correct off-axis aberrations such as field curvature and distortion. On the other hand, when the value of conditional expression (6) exceeds the lower limit, it is possible to prevent the focal length of the first lens from becoming short and the focal length of the fourth lens from becoming long. Spherical aberration and coma can be kept small, and the positive refractive power of the fourth lens can be maintained moderately. As a result, the exit pupil position can be moved away from the image sensor to the object side, ensuring good telecentric characteristics. can do.

As for the value f1 / f4 of the conditional expression (6), it is more desirable to satisfy the following conditional expression.
0.55 <f1 / f4 <2.5 (6) ''
It is more desirable for the values f1 / f4 to satisfy the following conditional expression.
0.60 <f1 / f4 <2.0 (6) "

  In still another aspect of the invention, the fourth lens has a shape with a convex surface facing the image side. Here, the “shape with the convex surface facing the image side” means that the surface position at the maximum effective diameter of the lens surface is located closer to the object side than the surface vertex.

By making the fourth lens a shape with the convex surface facing the image side, the diverging action of the off-axis light beam emitted from the third lens can be suppressed, and it becomes easy to ensure good telecentric characteristics.
Furthermore, it is desirable that the fourth lens has a meniscus shape with a convex surface facing the image side. By making the fourth lens into a meniscus shape, the object side surface becomes concave, and the incident angle of the light beam directed toward the periphery of the image sensor to the object side surface can be reduced, so that the occurrence of coma and distortion can be suppressed.

  In yet another aspect of the present invention, the fifth lens has a shape with a concave surface facing the image side in the vicinity of the optical axis.

  Thus, by making the image side surface of the fifth lens a concave surface facing the image side in the vicinity of the optical axis, it is possible to strongly set the negative refractive power having a diverging action on the side surface of the fifth lens. On the other hand, the back focus can be set to be reasonably short, and as a result, the optical total length can be shortened.

  In still another aspect of the present invention, an aperture stop is provided on the object side from the object side surface of the second lens.

  Since the exit pupil can be separated from the image plane by disposing the aperture stop on the object side from the object side surface of the second lens in this way, the chief ray incidence of the light beam that forms an image on the periphery of the image pickup surface of the image sensor The angle can be kept small.

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

  An imaging apparatus according to the present invention includes the above-described imaging lens and an imaging element that photoelectrically converts an image formed on an imaging surface by the imaging lens. By using the image pickup lens of the present invention, an image pickup apparatus capable of taking a high-quality image with a lens having a brightness with a wide angle and an F value of 2.6 or less is obtained while being small in size. be able to.

  The portable terminal which concerns on this invention is provided with the above-mentioned imaging device. That is, the portable terminal according to the present invention includes an imaging device that can obtain a high-quality captured image as described above.

It is a figure explaining an imaging device provided with the imaging lens of one embodiment of the present invention. 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. 2 is a cross-sectional view of an imaging lens of Example 1. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 1. FIG. 6 is a cross-sectional view of an imaging lens of Example 2. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 2. FIG. 6 is a cross-sectional view of an imaging lens of Example 3. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 3. FIGS. 6 is a cross-sectional view of an imaging lens of Example 4. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 4. FIGS. 6 is a cross-sectional view of an imaging lens of Example 5. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 5. FIGS. 6 is a cross-sectional view of an imaging lens of Example 6. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 6. FIG. 10 is a cross-sectional view of an imaging lens of Example 7. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 7. FIGS. 10 is a cross-sectional view of an imaging lens of Example 8. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 8. FIGS. 10 is a cross-sectional view of an imaging lens of Example 9. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 9. FIGS. 10 is a cross-sectional view of an imaging lens of Example 10. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 10. FIGS. 14 is a cross-sectional view of the imaging lens of Example 11. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 11. FIGS. 14 is a cross-sectional view of an imaging lens of Example 12. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 12. FIGS. 14 is a cross-sectional view of the imaging lens of Example 13. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 13. FIGS.

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

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

  The camera module (imaging device) 50 includes an imaging lens 10 that forms a subject image, an imaging element 51 that photoelectrically converts the subject image formed by the imaging lens 10, and holds the imaging element 51 from behind and wiring and the like. A wiring board 52 having the imaging lens 10 and the like, and a lens barrel portion 54 having an opening OP through which a light beam from the object side is incident. The imaging lens 10 has a function of forming a subject image on the imaging surface I of the imaging element 51.

  Although described in detail later, the imaging lens 10 includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

The imaging lens 10 is small in size, and as a measure, the imaging lens 10 aims at miniaturization at a level that satisfies the following expression (7).
L / 2Y <2.00 (7)
Here, L is the most object side lens surface of the entire imaging lens 10 (in the case of FIG. 1, the distance on the optical axis OA from the object side surface S1 to the image side focal point, and 2Y is the imaging surface of the image sensor 51. Diagonal length (diagonal length of the rectangular effective pixel region of the image sensor 51.) Here, the image-side focal point refers to an image point when a parallel ray parallel to the optical axis OA is incident on the imaging lens 10. By satisfying the range, the entire camera module 50 can be reduced in size and weight.

  When the parallel plate F is disposed between the most image-side lens surface (image side surface S1 in FIG. 1) of the imaging lens 10 and the image-side focal position, the thickness of the parallel plate F is defined as the air conversion distance. After that, the value of L is calculated.

  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 charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), photoelectrically converts incident light for each RGB, and outputs an analog signal thereof. The surface of the photoelectric conversion unit 51a as the light receiving unit is an imaging 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 sensor 51 from an external circuit, and can output a photoelectrically converted signal to the external circuit.

  A parallel plate F made of an optical low-pass filter, an IR cut filter, or the like is disposed and fixed on the imaging lens 10 side of the imaging element 51 so as to cover the imaging element 51 and the like by a holder member (not shown).

  The lens barrel 54 houses and holds the imaging lens 10. The lens barrel portion 54 moves the alignment of the imaging lens 10 by moving any one or more of the lenses from the first lens L1 to the fifth lens L5 constituting the imaging lens 10 along the optical axis OA. It has a drive mechanism 55a for enabling a focusing operation. The drive mechanism 55a includes, for example, a voice coil motor and a guide. The drive mechanism 55a can be composed of a stepping motor, a tangent screw type power transmission member, and a slide guide. Note that the image pickup lens 10 may be used as a fixed focus without having the drive mechanism 55a.

  Next, referring to FIGS. 2, 3 (A), and 3 (B), a tablet PC (Tablet PC), a smartphone, a mobile phone, and other portable terminals 300 each equipped with the camera module 50 illustrated in FIG. An example will be described.

  The mobile terminal 300 is, for example, a smartphone-type mobile phone, and includes an imaging unit 100 having a camera module 50 and a control unit (CPU: Central Processing Unit) that performs overall control of each unit and executes a program corresponding to each process. 301, a display operation unit 320 including a touch panel that displays data related to communication, captured video, and the like and receives a user operation, an operation unit 330 including a power switch, and the like, and an external device via an antenna 341. A wireless communication unit 340 for realizing various types of information communication with a server and the like, and a storage unit that stores necessary data such as a system program, various processing programs, and a terminal ID (identification) of the mobile terminal 300 ( ROM: Read Only Memory (360) and various processing programs and data executed by the control unit 301 Data, processing data, or temporary storage unit used as a work area for temporarily storing the imaging data and the like by the imaging unit 100: and a (RAM Random Access Memory) 370.

  In addition to the camera module 50 described above, the imaging unit 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 unit 100. The control unit 103 includes a CPU, a RAM, a ROM, and the like, and executes various processes in cooperation with various programs read from the ROM and expanded in the RAM. The control unit 301 is communicably connected to the control unit 103 of the imaging unit 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 a specific lens in the imaging lens 10 along the optical axis OA, thereby causing the imaging lens 10 to perform a focusing operation.

  The image sensor drive unit 107 controls the operation of the image sensor 51 when performing exposure or the like under the control of the control unit 103. Specifically, the image sensor drive unit 107 controls the image sensor 51 by scanning and driving based on the timing signal. Further, the image sensor driving unit 107 generates image data after converting an analog signal as a photoelectric conversion signal output from the image sensor 51 into digital data. Further, the image sensor driving unit 107 can perform various image processing such as distortion correction, color correction, and compression on the image data.

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

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

  The analog signal is appropriately gain-adjusted for each primary color component of RGB in the image sensor driving unit 107 and then converted into digital data. The digital data is subjected to color process processing including pixel interpolation processing and Y correction processing, and a digital luminance signal Y and color difference signals Cb, Cr (image data) are generated and stored in the image memory 108. The stored digital data is periodically read out from the image memory 108 to generate a video signal thereof, and is output to the display operation unit 320 via the control unit 103 and the control unit 301.

  All or part of the display operation unit 320 functions as an electronic viewfinder 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 and the like 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, a still image or a moving image is taken. One frame of image data stored in the image memory 108 is read in accordance with the operation content of the display operation unit 320, and compressed by the image sensor driving unit 107. The compressed image data is recorded in the RAM 370, for example, via the control unit 103 and the control unit 301.

  The camera module (imaging device) 50 is not limited to a built-in smartphone-type mobile phone as shown in FIG. 2, but is built into a conventional mobile phone, PHS (Personal Handyphone System), etc. Alternatively, it may be incorporated in a portable terminal such as a tablet PC, a PDA (Personal Digital Assistant), a mobile personal computer, a digital still camera, or a video camera.

  Hereinafter, returning to FIG. 1, the imaging lens 10 forms a subject image on the imaging surface I of the imaging element 51. The imaging lens 10 has, in order from the object side, a first lens L1 having a positive refractive power and a convex surface facing the image side, and an aspherical shape on at least one of the object side surface S3 and the image side surface S4. Negative refraction near the optical axis AX, the second lens L2, the third lens L3 having an aspherical shape on at least one of the object side surface S5 and the image side surface S6, the fourth lens L4 having positive refractive power, and And a fifth lens L5 having an inflection point at a position other than the intersection with the optical axis. The imaging lens 10 achieves downsizing by a telephoto type lens configuration in which a first lens L1 having a positive refractive power on the object side and a fifth lens L5 having a negative refractive power on the image side are disposed. The image side S2 of one lens L1 has a shape with a convex surface facing the image side. More specifically, a negative or weak positive refractive power is disposed on the object side and larger positive refractions larger than these on the image side. Widening the angle is realized by arranging the force. The first lens L1 has an object side surface S1 and an image side surface S2, the third lens L3 has an object side surface S5 and an image side surface S6, and the fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10.

  The imaging lens 10 described above satisfies the conditional expressions (1) to (4). In addition to the conditional expressions (1) to (4), it is preferable that the conditional expressions (5) to (7) are satisfied. In addition, even if each of conditional expressions (1) to (7) is independent, it has the above-described effects.

  Furthermore, the fourth lens L4 preferably has a shape with a convex surface facing the image side. Further, it is preferable that the image side surface of the fifth lens L5 has a shape in which a concave surface is directed to the image side in the vicinity of the optical axis. In addition, it is preferable that the aperture stop ST is disposed closer to the object side than the object side surface of the second lens L2.

〔Example〕
Examples of the imaging lens of the present invention will be shown below. Symbols used in each example are as follows.
f: Focal length of the entire imaging lens system fB: Back focus F: F number 2Y: Diagonal length 2ω on the imaging surface of the imaging device: Maximum field angle ENTP: Entrance pupil position (distance from the first surface to the entrance pupil position)
EXTP: exit pupil position (distance from imaging surface to exit pupil position)
H1: Front principal point position (distance from first surface to front principal point position)
H2: Rear principal point position (distance from the final surface to the rear principal point position)
R: radius of curvature D: spacing between axial upper surfaces Nd: refractive index νd of lens material with respect to d-line: Abbe number of lens material

ただし、
Ａｉ：ｉ次の非球面係数
Ｒ ：曲率半径
Ｋ ：円錐定数 In each embodiment, 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 and the X axis in the optical axis direction. The height in the direction perpendicular to the optical axis is represented by the following “Equation 1”.
[Equation 1]

However,
Ai: i-order aspheric coefficient R: radius of curvature K: conic constant

Hereinafter, specific examples 1 to 13 of the imaging lens of the present invention will be described.
[Example 1]
The overall specifications of Example 1 are shown below.
f = 3.53mm
fB = 0.2mm
F = 2.4
2Y = 6.4mm
2ω = 83 °
ENTP = 0mm
EXTP = -4.09mm
H1 = 0.63mm
H2 = -3.32mm

Table 1 shows lens data of Example 1.
[Table 1]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.13 0.74
2 * -173.611 0.44 1.54470 56.2 0.75
3 * -2.459 0.20 0.87
4 * 5.226 0.33 1.63470 23.9 1.12
5 * 2.013 0.25 1.28
6 * 4.886 0.56 1.54470 56.2 1.37
7 * -9.372 0.70 1.43
8 * -2.238 0.72 1.54470 56.2 1.64
9 * -0.979 0.11 1.70
10 * 2.176 0.58 1.58300 30.0 1.95
11 * 0.837 1.00 2.63
12 ∞ 0.40 1.51630 64.1 3.20
13 ∞ 3.20
In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰² ) is expressed using E (for example, 2.5E-02).

Table 2 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 1.
[Table 2]
Second side
K = 0.50000E + 02, A4 = -0.85698E-01, A6 = -0.47546E-01, A8 = 0.15420E-01,
A10 = -0.31701E-01, A12 = -0.10722E-01, A14 = 0.11143E-01
Third side
K = 0.41340E + 01, A4 = -0.15090E-01, A6 = -0.17535E-01, A8 = 0.27495E-01,
A10 = -0.12043E-01, A12 = -0.25557E-01, A14 = 0.33138E-01
4th page
K = 0.24147E + 01, A4 = -0.76060E-01, A6 = 0.65894E-01, A8 = -0.44753E-01,
A10 = -0.75493E-02, A12 = 0.24000E-01, A14 = -0.85563E-02
5th page
K = -0.75788E + 01, A4 = -0.26495E-01, A6 = 0.36623E-01, A8 = -0.31414E-01,
A10 = 0.20232E-02, A12 = 0.71893E-02, A14 = -0.24652E-02
6th page
K = -0.40784E + 02, A4 = -0.28247E-01, A6 = 0.23447E-02, A8 = -0.11544E-02,
A10 = 0.72059E-02, A12 = -0.16917E-02, A14 = -0.10603E-03
7th page
K = 0.30000E + 02, A4 = -0.40519E-01, A6 = 0.76128E-02, A8 = -0.33045E-02,
A10 = -0.22693E-03, A12 = 0.32880E-02, A14 = -0.74785E-03
8th page
K = -0.32277E + 00, A4 = 0.31670E-01, A6 = -0.74936E-02, A8 = 0.55910E-02,
A10 = 0.91635E-03, A12 = -0.68113E-03, A14 = 0.66054E-04
9th page
K = -0.32711E + 01, A4 = -0.65263E-01, A6 = 0.26708E-01, A8 = -0.52199E-02,
A10 = 0.11075E-02, A12 = 0.81485E-04, A14 = -0.31234E-04
10th page
K = -0.46789E + 01, A4 = -0.56371E-01, A6 = 0.64714E-02, A8 = -0.81478E-03,
A10 = -0.39497E-03, A12 = 0.73049E-04, A14 = -0.96109E-06
11th page
K = -0.37808E + 01, A4 = -0.34138E-01, A6 = 0.72485E-02, A8 = -0.15761E-02,
A10 = 0.20737E-03, A12 = -0.14988E-04, A14 = 0.44854E-06

The single lens data of Example 1 is shown in Table 3 below.
[Table 3]
Lens Start surface Focal length (mm)
1 2 4.575
2 4 -5.370
3 6 5.980
4 8 2.658
5 10 -2.778

  FIG. 4 is a sectional view of the imaging lens 110 (10) of the first embodiment. The imaging lens 110 (10) includes, in order from the object side, an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a lens that is convex on the image side in the vicinity of the optical axis OA, is a positive meniscus, and has both aspheric surfaces (hereinafter, referred to as both aspheric lenses). The second lens L2 is a double meniscus aspherical lens that is convex toward the object side in the vicinity of the optical axis OA. The third lens L3 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  5A to 5C show the spherical aberration, astigmatism, and distortion of the imaging lens 110 of Example 1. FIG. 5D and 5E show the meridional coma aberration of the imaging lens 110 of Example 1. FIG. In the aberration diagrams and the subsequent aberration diagrams, in spherical aberration and meridional coma aberration, the solid line represents the d-line and the dotted line represents the g-line, and in the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line Represents a meridional image plane.

[Example 2]
The overall specifications of Example 2 are shown below.
f = 3.84mm
fB = 0.2mm
F = 2.4
2Y = 6.4mm
2ω = 78.2 °
ENTP = 0mm
EXTP = -4.56mm
H1 = 0.74mm
H2 = -3.64mm

Table 4 shows lens data of Example 2.
[Table 4]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.12 0.80
2 * 19.600 0.46 1.54470 56.2 0.80
3 * -2.679 0.20 0.86
4 * 4.844 0.33 1.63470 23.9 1.08
5 * 1.844 0.34 1.21
6 * 4.431 0.52 1.54470 56.2 1.37
7 * -13.691 0.79 1.43
8 * -2.054 0.81 1.54470 56.2 1.70
9 * -0.982 0.05 1.79
10 * 2.198 0.63 1.58300 30.0 2.16
11 * 0.854 1.12 2.66
12 ∞ 0.40 1.51630 64.1 3.20
13 ∞ 3.20

Table 5 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 2.
[Table 5]
Second side
K = -0.50000E + 02, A4 = -0.74815E-01, A6 = -0.36158E-01, A8 = -0.11265E-01,
A10 = -0.23708E-01, A12 = 0.42094E-01, A14 = -0.38342E-01
Third side
K = 0.53700E + 01, A4 = -0.46546E-02, A6 = -0.22490E-01, A8 = 0.23988E-01,
A10 = -0.84812E-02, A12 = -0.19338E-01, A14 = 0.29592E-01
4th page
K = 0.39679E + 01, A4 = -0.79559E-01, A6 = 0.75244E-01, A8 = -0.50841E-01,
A10 = -0.91942E-02, A12 = 0.30016E-01, A14 = -0.11008E-01
5th page
K = -0.69287E + 01, A4 = -0.20747E-01, A6 = 0.42636E-01, A8 = -0.36380E-01,
A10 = 0.23365E-02, A12 = 0.90829E-02, A14 = -0.31472E-02
6th page
K = -0.31466E + 02, A4 = -0.29625E-01, A6 = 0.10804E-02, A8 = -0.17658E-02,
A10 = 0.87834E-02, A12 = -0.19917E-02, A14 = -0.11732E-03
7th page
K = 0.30000E + 02, A4 = -0.42988E-01, A6 = 0.96040E-02, A8 = -0.33987E-02,
A10 = -0.21795E-03, A12 = 0.40225E-02, A14 = -0.10506E-02
8th page
K = -0.29681E + 00, A4 = 0.32276E-01, A6 = -0.80652E-02, A8 = 0.65135E-02,
A10 = 0.10980E-02, A12 = -0.85030E-03, A14 = 0.94131E-04
9th page
K = -0.32018E + 01, A4 = -0.70201E-01, A6 = 0.27983E-01, A8 = -0.64521E-02,
A10 = 0.12308E-02, A12 = 0.93590E-04, A14 = -0.35542E-04
10th page
K = -0.56367E + 01, A4 = -0.43572E-01, A6 = 0.70269E-02, A8 = -0.89826E-03,
A10 = -0.37167E-03, A12 = 0.11358E-03, A14 = -0.70900E-05
11th page
K = -0.40013E + 01, A4 = -0.29737E-01, A6 = 0.71764E-02, A8 = -0.17271E-02,
A10 = 0.24885E-03, A12 = -0.19249E-04, A14 = 0.64959E-06

The single lens data of Example 2 is shown in Table 6 below.
[Table 6]
Lens Start surface Focal length (mm)
1 2 4.358
2 4 -4.899
3 6 6.208
4 8 2.722
5 10 -2.900

  FIG. 6 is a sectional view of the imaging lens 210 (10) of the second embodiment. The imaging lens 210 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a double meniscus aspherical lens that is convex toward the object side in the vicinity of the optical axis OA. The third lens L3 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  7A to 7C show spherical aberration, astigmatism, and distortion of the imaging lens 210 of Example 2. FIG. 7D and 7E show the meridional coma aberration of the imaging lens 210 of Example 2. FIG.

Example 3
The overall specifications of Example 3 are shown below.
f = 3.7mm
fB = 0.2mm
F = 2.4
2Y = 6.4mm
2ω = 80.2 °
ENTP = 0mm
EXTP = -3.58mm
H1 = 0.07mm
H2 = -3.51mm

Table 7 shows lens data of Example 3.
[Table 7]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.13 0.77
2 * -182.292 0.62 1.54470 56.2 0.79
3 * -2.255 0.21 0.95
4 * 3.932 0.33 1.63470 23.9 1.21
5 * 1.606 0.21 1.36
6 * 3.319 0.69 1.54470 56.2 1.45
7 * -33.051 0.68 1.47
8 * -2.952 0.62 1.54470 56.2 1.69
9 * -1.022 0.24 1.74
10 * 3.294 0.50 1.54470 56.2 1.85
11 * 0.864 0.83 2.62
12 ∞ 0.40 1.51630 64.1 3.20
13 ∞ 3.20

Table 8 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 3.
[Table 8]
Second side
K = 0.50000E + 02, A4 = -0.72445E-01, A6 = -0.31702E-01, A8 = 0.85500E-02,
A10 = -0.23713E-01, A12 = 0.32944E-02, A14 = 0.11400E-01
Third side
K = 0.29267E + 01, A4 = -0.20175E-03, A6 = -0.14240E-01, A8 = 0.32773E-01,
A10 = -0.72958E-02, A12 = -0.19548E-01, A14 = 0.23435E-01
4th page
K = -0.43780E + 01, A4 = -0.80623E-01, A6 = 0.56761E-01, A8 = -0.28816E-01,
A10 = -0.45610E-02, A12 = 0.13749E-01, A14 = -0.44361E-02
5th page
K = -0.51184E + 01, A4 = -0.18619E-01, A6 = 0.28622E-01, A8 = -0.21923E-01,
A10 = 0.17778E-02, A12 = 0.42952E-02, A14 = -0.14799E-02
6th page
K = -0.16641E + 02, A4 = -0.91299E-02, A6 = 0.55811E-02, A8 = -0.12706E-02,
A10 = 0.39047E-02, A12 = -0.11635E-02, A14 = 0.86726E-04
7th page
K = 0.30000E + 02, A4 = -0.50706E-01, A6 = 0.37995E-02, A8 = -0.28802E-02,
A10 = -0.14715E-03, A12 = 0.21192E-02, A14 = -0.24373E-03
8th page
K = -0.16510E + 00, A4 = 0.30557E-01, A6 = -0.64599E-02, A8 = 0.41286E-02,
A10 = 0.99326E-03, A12 = -0.32737E-03, A14 = -0.39269E-04
9th page
K = -0.37659E + 01, A4 = -0.43082E-01, A6 = 0.28572E-01, A8 = -0.29052E-02,
A10 = 0.76397E-03, A12 = -0.65346E-04, A14 = -0.49585E-04
10th page
K = -0.44701E + 01, A4 = -0.87981E-01, A6 = 0.16006E-01, A8 = -0.24279E-02,
A10 = -0.32456E-03, A12 = 0.11247E-03, A14 = -0.23648E-04
11th page
K = -0.41935E + 01, A4 = -0.46145E-01, A6 = 0.10921E-01, A8 = -0.18068E-02,
A10 = 0.13167E-03, A12 = -0.30888E-05, A14 = -0.57799E-07

The single lens data of Example 3 is shown in Table 9 below.
[Table 9]
Lens Start surface Focal length (mm)
1 2 4.186
2 4 -4.531
3 6 5.574
4 8 2.575
5 10 -2.316

  FIG. 8 is a cross-sectional view of the imaging lens 310 (10) of the third embodiment. The imaging lens 310 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The second lens L2 is a double meniscus aspherical lens that is convex toward the object side in the vicinity of the optical axis OA. The third lens L3 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  9A to 9C show spherical aberration, astigmatism, and distortion of the imaging lens 310 of Example 3. FIG. 9D and 9E show the meridional coma aberration of the imaging lens 310 of Example 3. FIG.

Example 4
The overall specifications of Example 4 are shown below.
f = 3.82mm
fB = 0.2mm
F = 2.4
2Y = 6.4mm
2ω = 78.4 °
ENTP = 0.24mm
EXTP = -4.07mm
H1 = 0.64mm
H2 = -3.63mm

Table 10 shows lens data of Example 4.
[Table 10]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 10.780 0.49 1.54470 56.2 0.85
2 * -2.808 -0.08 0.82
3 (Aperture) ∞ 0.31 0.80
4 * 4.615 0.31 1.63470 23.9 0.99
5 * 1.789 0.36 1.10
6 * 4.435 0.50 1.54470 56.2 1.29
7 * -19.777 0.71 1.38
8 * -2.019 0.83 1.54470 56.2 1.65
9 * -0.966 0.05 1.76
10 * 2.193 0.63 1.58300 30.0 2.21
11 * 0.853 1.09 2.68
12 ∞ 0.40 1.51630 64.1 3.20
13 ∞ 3.20

Table 11 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 4.
[Table 11]
First side
K = -0.49238E + 02, A4 = -0.63578E-01, A6 = -0.30701E-01, A8 = -0.16835E-01,
A10 = -0.25381E-01, A12 = 0.54389E-01, A14 = -0.45339E-01
Second side
K = 0.60781E + 01, A4 = -0.65387E-03, A6 = -0.21915E-01, A8 = 0.23921E-01,
A10 = -0.93662E-02, A12 = -0.19208E-01, A14 = 0.31727E-01
4th page
K = 0.30906E + 01, A4 = -0.84122E-01, A6 = 0.79658E-01, A8 = -0.54000E-01,
A10 = -0.10132E-01, A12 = 0.33468E-01, A14 = -0.12356E-01
5th page
K = -0.66212E + 01, A4 = -0.19559E-01, A6 = 0.44827E-01, A8 = -0.39129E-01,
A10 = 0.26927E-02, A12 = 0.10240E-01, A14 = -0.36194E-02
6th page
K = -0.31113E + 02, A4 = -0.30549E-01, A6 = 0.88688E-03, A8 = -0.18687E-02,
A10 = 0.96803E-02, A12 = -0.22152E-02, A14 = -0.14710E-03
7th page
K = 0.30000E + 02, A4 = -0.44640E-01, A6 = 0.10680E-01, A8 = -0.34787E-02,
A10 = -0.26084E-03, A12 = 0.44578E-02, A14 = -0.12089E-02
8th page
K = -0.31967E + 00, A4 = 0.34336E-01, A6 = -0.83993E-02, A8 = 0.70345E-02,
A10 = 0.12178E-02, A12 = -0.95004E-03, A14 = 0.10406E-03
9th page
K = -0.31812E + 01, A4 = -0.73334E-01, A6 = 0.29574E-01, A8 = -0.68939E-02,
A10 = 0.13423E-02, A12 = 0.10378E-03, A14 = -0.39303E-04
10th page
K = -0.57611E + 01, A4 = -0.43303E-01, A6 = 0.71604E-02, A8 = -0.88276E-03,
A10 = -0.38809E-03, A12 = 0.12691E-03, A14 = -0.89742E-05
11th page
K = -0.40993E + 01, A4 = -0.31301E-01, A6 = 0.76976E-02, A8 = -0.18785E-02,
A10 = 0.27184E-03, A12 = -0.21372E-04, A14 = 0.74747E-06

The single lens data of Example 4 is shown in Table 12 below.
[Table 12]
Lens Start surface Focal length (mm)
1 1 4.142
2 4 -4.807
3 6 6.700
4 8 2.665
5 10 -2.896

  FIG. 10 is a cross-sectional view of the imaging lens 410 (10) of the fourth embodiment. The imaging lens 410 (10) includes, in order from the object side, a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a double meniscus aspherical lens that is convex toward the object side in the vicinity of the optical axis OA. The third lens L3 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  11A to 11C show the spherical aberration, astigmatism, and distortion of the imaging lens 410 of Example 4. FIG. 11D and 11E show the meridional coma aberration of the imaging lens 410 of Example 4. FIG.

Example 5
The overall specifications of Example 5 are shown below.
[Table 13]
f = 2.09mm
fB = 0.18mm
F = 2.2
2Y = 3.6mm
2ω = 79.8 °
ENTP = 0mm
EXTP = -2.94mm
H1 = 0.69mm
H2 = -1.91mm

Table 13 shows lens data of Example 5.
[Table 13]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.09 0.48
2 * 9.478 0.44 1.54470 56.2 0.48
3 * -1.053 0.13 0.58
4 * -2.240 0.20 1.63470 23.9 0.66
5 * -18.523 0.26 0.75
6 * -4.982 0.20 1.63470 23.9 0.78
7 * 4.362 0.06 0.89
8 * -3.114 0.61 1.54470 56.2 0.98
9 * -0.697 0.05 1.00
10 * 0.804 0.30 1.54470 56.2 1.21
11 * 0.470 0.70 1.45
12 ∞ 0.30 1.51630 64.1 1.80
13 ∞ 1.80

Table 14 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 5.
[Table 14]
Second side
K = -0.50000E + 02, A4 = -0.40772E + 00, A6 = -0.37441E + 00, A8 = -0.19556E + 01,
A10 = -0.22077E + 00, A12 = 0.40552E + 01, A14 = -0.50484E + 02
Third side
K = 0.15040E + 01, A4 = 0.54665E-02, A6 = -0.17184E + 00, A8 = 0.38904E + 00,
A10 = -0.36398E + 00, A12 = -0.29848E + 01, A14 = 0.12232E + 02
4th page
K = -0.36657E + 02, A4 = -0.21749E + 00, A6 = 0.87394E-01, A8 = -0.72073E + 00,
A10 = -0.76300E + 00, A12 = 0.39472E + 01, A14 = -0.37180E + 01
5th page
K = 0, A4 = 0.10665E + 00, A6 = -0.80132E + 00, A8 = 0.14572E + 00,
A10 = 0.12794E + 01, A12 = -0.51035E + 01, A14 = 0.50027E + 01
6th page
K = 0.34252E + 02, A4 = -0.55373E + 00, A6 = -0.18153E + 00, A8 = 0.73419E + 00,
A10 = 0.61989E-01, A12 = -0.46092E + 00, A14 = 0.86475E + 00
7th page
K = -0.50000E + 02, A4 = -0.57512E + 00, A6 = 0.30225E + 00, A8 = -0.35733E + 00,
A10 = 0.44032E + 00, A12 = 0.10089E + 01, A14 = -0.10408E + 01
8th page
K = -0.36689E + 02, A4 = -0.12833E + 00, A6 = 0.14887E + 00, A8 = 0.15145E + 00,
A10 = 0.35644E-01, A12 = -0.16444E + 00, A14 = 0.59935E-01
9th page
K = -0.27995E + 01, A4 = -0.36676E + 00, A6 = 0.52519E + 00, A8 = -0.71632E-01,
A10 = -0.82254E-01, A12 = -0.25144E-01, A14 = 0.79239E-01
10th page
K = -0.53099E + 01, A4 = -0.84616E-01, A6 = -0.46909E-01, A8 = -0.13864E-01,
A10 = 0.14890E-01, A12 = 0.93834E-02, A14 = -0.59090E-02
11th page
K = -0.29439E + 01, A4 = -0.14359E + 00, A6 = 0.47058E-01, A8 = -0.20251E-01,
A10 = 0.72329E-02, A12 = -0.12447E-02, A14 = -0.41513E-05

The single lens data of Example 5 is shown in Table 15 below.
[Table 15]
Lens Start surface Focal length (mm)
1 2 1.766
2 4 -4.033
3 6 -3.634
4 8 1.513
5 10 -3.046

  FIG. 12 is a cross-sectional view of the imaging lens 510 (10) of the fifth embodiment. The imaging lens 510 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a negative meniscus both aspherical lens convex toward the image side in the vicinity of the optical axis OA. The third lens L3 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 13A to 13C show spherical aberration, astigmatism, and distortion of the imaging lens 510 of Example 5. FIG. FIGS. 13D and 13E show the meridional coma aberration of the imaging lens 510 of Example 5. FIG.

Example 6
The overall specifications of Example 6 are shown below.
f = 2.05mm
fB = 0.18mm
F = 2.2
2Y = 3.6mm
2ω = 80.8 °
ENTP = 0mm
EXTP = -3.44mm
H1 = 0.89mm
H2 = -1.87mm

Table 16 shows lens data of Example 6.
[Table 16]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.10 0.47
2 * ∞ 0.46 1.54470 56.2 0.47
3 * -0.929 0.13 0.59
4 * -3.244 0.20 1.63470 23.9 0.68
5 * 9.223 0.23 0.79
6 * -4.992 0.20 1.63470 23.9 0.82
7 * 3.448 0.07 0.92
8 * -3.257 0.63 1.54470 56.2 1.02
9 * -0.802 0.05 1.03
10 * 0.757 0.30 1.54470 56.2 1.26
11 * 0.544 0.72 1.48
12 ∞ 0.30 1.51630 64.1 1.80
13 ∞ 1.80

Table 17 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 6.
[Table 17]
Second side
K = -0.49984E + 02, A4 = -0.46584E + 00, A6 = -0.43623E + 00, A8 = -0.31545E + 01,
A10 = 0.12670E + 01, A12 = 0.19251E + 02, A14 = -0.13199E + 03
Third side
K = 0.94189E + 00, A4 = -0.12963E-01, A6 = -0.18449E + 00, A8 = 0.90251E + 00,
A10 = -0.29585E + 00, A12 = -0.55977E + 01, A14 = 0.12163E + 02
4th page
K = -0.50000E + 02, A4 = -0.25847E + 00, A6 = -0.10058E + 00, A8 = -0.70509E-01,
A10 = 0.66718E-01, A12 = 0.27141E + 01, A14 = -0.69108E + 01
5th page
K = 0, A4 = 0.89998E-02, A6 = -0.69841E + 00, A8 = 0.24198E + 00,
A10 = 0.15510E + 01, A12 = -0.48451E + 01, A14 = 0.34878E + 01
6th page
K = 0.30707E + 02, A4 = -0.50854E + 00, A6 = -0.15559E + 00, A8 = 0.74562E + 00,
A10 = 0.13116E + 00, A12 = -0.46296E + 00, A14 = 0.40144E + 00
7th page
K = -0.42644E + 02, A4 = -0.57916E + 00, A6 = 0.33229E + 00, A8 = -0.37560E + 00,
A10 = 0.36694E + 00, A12 = 0.97615E + 00, A14 = -0.89782E + 00
8th page
K = -0.42880E + 02, A4 = -0.12276E + 00, A6 = 0.13442E + 00, A8 = 0.14213E + 00,
A10 = 0.32323E-01, A12 = -0.16393E + 00, A14 = 0.65999E-01
9th page
K = -0.24660E + 01, A4 = -0.36059E + 00, A6 = 0.52691E + 00, A8 = -0.68064E-01,
A10 = -0.86913E-01, A12 = -0.40014E-01, A14 = 0.72333E-01
10th page
K = -0.32254E + 01, A4 = -0.97603E-01, A6 = -0.69606E-02, A8 = -0.42040E-01,
A10 = 0.11942E-01, A12 = 0.15156E-01, A14 = -0.67980E-02
11th page
K = -0.23459E + 01, A4 = -0.15174E + 00, A6 = 0.38353E-01, A8 = -0.16036E-01,
A10 = 0.68684E-02, A12 = -0.14835E-02, A14 = 0.46330E-04

The single lens data of Example 6 is shown in Table 18 below.
[Table 18]
Lens Start surface Focal length (mm)
1 2 1.706
2 4 -3.758
3 6 -3.184
4 8 1.793
5 10 -6.999

  FIG. 14 is a cross-sectional view of the imaging lens 610 (10) of the sixth embodiment. The imaging lens 610 (10) includes, in order from the object side, an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a positive aspherical lens that is flat on the object side and convex on the image side in the vicinity of the optical axis OA. The second lens L2 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The third lens L3 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 15A to 15C show spherical aberration, astigmatism, and distortion of the imaging lens 610 of Example 6. FIG. 15D and 15E show the meridional coma aberration of the imaging lens 610 of Example 6. FIG.

Example 7
The overall specifications of Example 7 are shown below.
f = 2.04mm
fB = 0.18mm
F = 2.2
2Y = 3.6mm
2ω = 81.0 °
ENTP = 0mm
EXTP = -3.88mm
H1 = 1.02mm
H2 = -1.86mm

Table 19 shows lens data of Example 7.
[Table 19]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.12 0.46
2 * -6.582 0.44 1.54470 56.2 0.47
3 * -0.859 0.12 0.57
4 * -16.593 0.20 1.63470 23.9 0.68
5 * 3.382 0.28 0.79
6 * -5.013 0.20 1.63470 23.9 0.83
7 * 3.010 0.11 0.92
8 * -3.527 0.62 1.54470 56.2 1.05
9 * -0.868 0.05 1.06
10 * 0.797 0.31 1.54470 56.2 1.29
11 * 0.626 0.72 1.49
12 ∞ 0.30 1.51630 64.1 1.80
13 ∞ 1.80

Table 20 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 7.
[Table 20]
Second side
K = 0.44371E + 02, A4 = -0.53771E + 00, A6 = -0.53383E + 00, A8 = -0.39260E + 01,
A10 = 0.27925E + 01, A12 = 0.31473E + 02, A14 = -0.23110E + 03
Third side
K = 0.76485E + 00, A4 = -0.96316E-02, A6 = -0.45385E-01, A8 = 0.88026E + 00,
A10 = -0.88032E + 00, A12 = -0.57047E + 01, A14 = 0.18088E + 02
4th page
K = -0.50000E + 02, A4 = -0.15847E + 00, A6 = -0.22229E + 00, A8 = -0.12011E + 00,
A10 = 0.23346E + 00, A12 = 0.27906E + 01, A14 = -0.75935E + 01
5th page
K = 0, A4 = -0.58818E-01, A6 = -0.68317E + 00, A8 = 0.23511E + 00,
A10 = 0.15325E + 01, A12 = -0.48062E + 01, A14 = 0.35130E + 01
6th page
K = 0.31452E + 02, A4 = -0.47884E + 00, A6 = -0.14154E + 00, A8 = 0.75105E + 00,
A10 = 0.15011E + 00, A12 = -0.44710E + 00, A14 = 0.35293E + 00
7th page
K = -0.31144E + 02, A4 = -0.57182E + 00, A6 = 0.35456E + 00, A8 = -0.36887E + 00,
A10 = 0.34851E + 00, A12 = 0.95832E + 00, A14 = -0.88321E + 00
8th page
K = -0.50000E + 02, A4 = -0.12488E + 00, A6 = 0.12665E + 00, A8 = 0.13738E + 00,
A10 = 0.31213E-01, A12 = -0.16328E + 00, A14 = 0.67823E-01
9th page
K = -0.23900E + 01, A4 = -0.37317E + 00, A6 = 0.52375E + 00, A8 = -0.68918E-01,
A10 = -0.91341E-01, A12 = -0.44448E-01, A14 = 0.72809E-01
10th page
K = -0.30863E + 01, A4 = -0.66223E-01, A6 = 0.43177E-02, A8 = -0.52703E-01,
A10 = 0.85402E-02, A12 = 0.15980E-01, A14 = -0.58646E-02
11th page
K = -0.21804E + 01, A4 = -0.13124E + 00, A6 = 0.24105E-01, A8 = -0.14785E-01,
A10 = 0.74443E-02, A12 = -0.14780E-02, A14 = 0.24554E-04

The single lens data of Example 7 is shown in Table 21 below.
[Table 21]
Lens Start surface Focal length (mm)
1 2 1.765
2 4 -4.409
3 6 -2.935
4 8 1.954
5 10 -14.782

  FIG. 16 is a cross-sectional view of the imaging lens 710 (10) of Example 7. The imaging lens 710 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The second lens L2 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The third lens L3 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 17A to 17C show spherical aberration, astigmatism, and distortion of the imaging lens 710 of Example 7. FIG. FIGS. 17D and 17E show meridional coma aberration of the imaging lens 710 of Example 7. FIGS.

Example 8
The overall specifications of Example 8 are shown below.
f = 3.67mm
fB = 0.2mm
F = 2.6
2Y = 6.4mm
2ω = 80.8 °
ENTP = 0.16mm
EXTP = -3.93mm
H1 = 0.57mm
H2 = -3.47mm

Table 22 shows lens data of Example 8.
[Table 22]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 36.744 0.42 1.58910 61.2 0.71
2 * -2.297 -0.10 0.74
3 (Aperture) ∞ 0.18 0.73
4 * -11.756 0.28 1.63200 23.4 0.82
5 * -15.548 0.42 0.89
6 * -4.419 0.30 1.63200 23.4 1.03
7 * 15.420 0.47 1.19
8 * -14.682 1.15 1.54470 56.2 1.58
9 * -1.355 0.19 1.70
10 * 1.709 0.51 1.54470 56.2 2.17
11 * 0.850 1.24 2.67
12 ∞ 0.30 1.51630 64.1 3.20
13 ∞ 3.20

Table 23 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 8.
[Table 23]
First side
K = -0.35664E + 02, A4 = -0.14379E + 00, A6 = -0.77920E-01, A8 = -0.39135E-01,
A10 = 0.12539E-01, A12 = -0.67172E-01, A14 = -0.34929E-02
Second side
K = 0.50330E + 01, A4 = -0.52534E-01, A6 = 0.24077E-02, A8 = 0.22877E-01,
A10 = -0.23160E-01, A12 = -0.50505E-01, A14 = 0.14295E + 00
4th page
K = 0.50000E + 02, A4 = 0.56238E-01, A6 = 0.50757E-01, A8 = -0.10567E + 00,
A10 = 0.36728E-01, A12 = 0.72836E-01, A14 = -0.58825E-01
5th page
K = -0.50000E + 02, A4 = 0.27573E-01, A6 = 0.42252E-01, A8 = -0.88305E-01,
A10 = 0.72992E-01, A12 = -0.36484E-01, A14 = 0.42196E-02
6th page
K = -0.94116E + 01, A4 = -0.68542E-01, A6 = 0.41893E-01, A8 = 0.46351E-01,
A10 = -0.12961E-01, A12 = -0.33340E-01, A14 = 0.15333E-01
7th page
K = -0.50000E + 02, A4 = -0.27917E-01, A6 = 0.25547E-01, A8 = 0.60124E-02,
A10 = -0.38878E-02, A12 = -0.23680E-02, A14 = 0.10382E-02
8th page
K = 0.30735E + 02, A4 = 0.29807E-01, A6 = -0.56980E-02, A8 = -0.22552E-02,
A10 = 0.81279E-03, A12 = 0.54177E-03, A14 = -0.13437E-03
9th page
K = -0.41942E + 01, A4 = -0.51673E-01, A6 = 0.27446E-01, A8 = -0.70242E-02,
A10 = 0.40584E-03, A12 = 0.71434E-04, A14 = 0.56895E-04
10th page
K = -0.24365E + 01, A4 = -0.81670E-01, A6 = 0.12911E-01, A8 = -0.73800E-03,
A10 = -0.34132E-03, A12 = 0.97713E-04, A14 = -0.68755E-05
11th page
K = -0.25146E + 01, A4 = -0.53156E-01, A6 = 0.12510E-01, A8 = -0.21166E-02,
A10 = 0.23072E-03, A12 = -0.15169E-04, A14 = 0.46819E-06

The single lens data of Example 8 is shown in Table 24 below.
[Table 24]
Lens Start surface Focal length (mm)
1 1 3.684
2 4 -78.486
3 6 -5.403
4 8 2.660
5 10 -3.918

  FIG. 18 is a cross-sectional view of the imaging lens 810 (10) of the eighth embodiment. The imaging lens 810 (10) includes, in order from the object side, a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a double aspheric lens that is convex toward the image side and slightly negative meniscus in the vicinity of the optical axis OA. The third lens L3 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 19A to 19C show spherical aberration, astigmatism, and distortion of the imaging lens 810 of Example 8. FIG. FIGS. 19D and 19E show the meridional coma aberration of the imaging lens 810 of Example 8. FIG.

Example 9
The overall specifications of Example 9 are shown below.
f = 3.59mm
fB = 0.2mm
F = 2.6
2Y = 6.4mm
2ω = 82 °
ENTP = 0mm
EXTP = -4.41mm
H1 = 0.8mm
H2 = -3.39mm

Table 25 shows lens data of Example 9.
[Table 25]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.12 0.69
2 * -90.000 0.41 1.58910 61.2 0.71
3 * -2.111 0.12 0.80
4 * -10.786 0.27 1.63200 23.4 0.86
5 * -12.945 0.41 0.94
6 * -3.484 0.28 1.63200 23.4 1.06
7 * 29.823 0.39 1.22
8 * -17.675 1.16 1.54470 56.2 1.58
9 * -1.318 0.20 1.69
10 * 1.514 0.45 1.54470 56.2 2.24
11 * 0.800 1.29 2.69
12 ∞ 0.30 1.51630 64.1 3.20
13 ∞ 3.20

Table 26 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 9.
[Table 26]
Second side
K = -0.50000E + 02, A4 = -0.16066E + 00, A6 = -0.73429E-01, A8 = -0.60380E-01,
A10 = -0.20025E-01, A12 = -0.56877E-01, A14 = -0.45567E-02
Third side
K = 0.42826E + 01, A4 = -0.58623E-01, A6 = 0.61168E-02, A8 = 0.31823E-01,
A10 = -0.36498E-01, A12 = -0.85408E-01, A14 = 0.21256E + 00
4th page
K = 0.50000E + 02, A4 = 0.52648E-01, A6 = 0.53607E-01, A8 = -0.12581E + 00,
A10 = 0.39907E-01, A12 = 0.94493E-01, A14 = -0.73316E-01
5th page
K = -0.50000E + 02, A4 = 0.28368E-01, A6 = 0.39762E-01, A8 = -0.10303E + 00,
A10 = 0.88188E-01, A12 = -0.46564E-01, A14 = 0.62934E-02
6th page
K = -0.79082E + 01, A4 = -0.73082E-01, A6 = 0.49282E-01, A8 = 0.54176E-01,
A10 = -0.14833E-01, A12 = -0.43419E-01, A14 = 0.19654E-01
7th page
K = -0.50000E + 02, A4 = -0.29216E-01, A6 = 0.28076E-01, A8 = 0.68727E-02,
A10 = -0.42553E-02, A12 = -0.29104E-02, A14 = 0.11680E-02
8th page
K = 0.37422E + 02, A4 = 0.31231E-01, A6 = -0.65519E-02, A8 = -0.24675E-02,
A10 = 0.10197E-02, A12 = 0.66788E-03, A14 = -0.18177E-03
9th page
K = -0.42838E + 01, A4 = -0.55782E-01, A6 = 0.31587E-01, A8 = -0.80149E-02,
A10 = 0.43238E-03, A12 = 0.68298E-04, A14 = 0.76669E-04
10th page
K = -0.23989E + 01, A4 = -0.82761E-01, A6 = 0.13921E-01, A8 = -0.93026E-03,
A10 = -0.41201E-03, A12 = 0.12217E-03, A14 = -0.87377E-05
11th page
K = -0.24143E + 01, A4 = -0.56596E-01, A6 = 0.13644E-01, A8 = -0.24145E-02,
A10 = 0.27703E-03, A12 = -0.19080E-04, A14 = 0.62191E-06

The single lens data of Example 9 is shown in Table 27 below.
[Table 27]
Lens Start surface Focal length (mm)
1 2 3.663
2 4 -107.567
3 6 -4.920
4 8 2.552
5 10 -3.997

  FIG. 20 is a cross-sectional view of the imaging lens 910 (10) of Example 9. The imaging lens 910 (10) includes, in order from the object side, an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The second lens L2 is a double aspheric lens that is convex toward the image side and slightly negative meniscus in the vicinity of the optical axis OA. The third lens L3 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 21A to 21C show spherical aberration, astigmatism, and distortion of the imaging lens 910 of Example 9. FIG. 21D and 21E show the meridional coma aberration of the imaging lens 910 of Example 9. FIG.

Example 10
The overall specifications of Example 10 are shown below.
f = 2.4mm
fB = 0.2mm
F = 2.4
2Y = 4.6mm
2ω = 86.6 °
ENTP = 0mm
EXTP = -3.05mm
H1 = 0.63mm
H2 = -2.2mm

Table 28 shows lens data of Example 10.
[Table 28]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.07 0.50
2 * 4.652 0.59 1.54470 56.2 0.51
3 * -1.126 0.06 0.64
4 * -3.752 0.25 1.63470 23.9 0.69
5 * 3.485 0.29 0.84
6 * -1.544 0.29 1.54470 56.2 0.92
7 * -3.393 0.05 1.00
8 * -5.964 0.48 1.53 180 56.6 1.03
9 * -0.892 0.05 1.10
10 * 0.891 0.33 1.53180 56.6 1.50
11 * 0.542 1.01 1.83
12 ∞ 0.10 1.51630 64.2 2.30
13 ∞ 2.30

Table 29 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 10.
[Table 29]
Second side
K = -0.43370E + 02, A4 = -0.13119E + 00, A6 = -0.16705E + 00, A8 = -0.90606E + 00,
A10 = 0.48604E-01
Third side
K = -0.73977E + 00, A4 = -0.98058E-01, A6 = -0.22632E + 00, A8 = 0.88067E-01,
A10 = -0.54324E + 00
4th page
K = 0.59409E + 00, A4 = -0.23468E + 00, A6 = -0.69759E-01, A8 = 0.78810E-01,
A10 = 0.10045E + 00
5th page
K = -0.15257E + 02, A4 = -0.13749E + 00, A6 = -0.30382E-01, A8 = -0.63661E-01,
A10 = 0.63541E-01, A12 = 0.32233E-01
6th page
K = -0.53039E + 01, A4 = 0.12876E + 00, A6 = -0.13157E + 00, A8 = 0.13702E + 00,
A10 = -0.21016E-02, A12 = -0.93547E-02
7th page
K = 0, A4 = -0.32035E-01, A6 = 0.13605E-01, A8 = -0.76855E-02,
A10 = -0.60074E-02, A12 = 0.66654E-02
8th page
K = 0, A4 = 0.30834E-01, A6 = -0.20119E-01, A8 = 0.11695E-02,
A10 = -0.19468E-02, A12 = -0.14962E-01
9th page
K = -0.39519E + 01, A4 = -0.93071E-01, A6 = 0.10569E + 00, A8 = -0.19215E-01,
A10 = 0.24609E-01, A12 = -0.25990E-03
10th page
K = -0.17179E + 01, A4 = -0.30183E + 00, A6 = 0.65583E-01, A8 = -0.30330E-02,
A10 = 0.48063E-03, A12 = -0.41479E-09
11th page
K = -0.23615E + 01, A4 = -0.19628E + 00, A6 = 0.77784E-01, A8 = -0.22044E-01,
A10 = 0.34904E-02, A12 = -0.26020E-03

The single lens data of Example 10 is shown in Table 30 below.
[Table 30]
Lens Start surface Focal length (mm)
1 2 1.727
2 4 -2.809
3 6 -5.512
4 8 1.909
5 10 -3.858

  FIG. 22 is a cross-sectional view of the imaging lens 1010 (10) of the tenth embodiment. The imaging lens 1010 (10) includes, in order from the object side, an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The third lens L3 is a negative meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  23A to 23C show the spherical aberration, astigmatism, and distortion of the imaging lens 1010 of Example 10. FIG. 23D and 23E show the meridional coma aberration of the imaging lens 1010 of Example 10. FIG.

Example 11
The overall specifications of Example 11 are shown below.
f = 2.6mm
fB = 0.2mm
F = 2.6
2Y = 4.6mm
2ω = 81.6 °
ENTP = 0mm
EXTP = -3.26mm
H1 = 0.65mm
H2 = -2.4mm

Table 31 shows lens data of Example 11.
[Table 31]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.13 0.50
2 * 3.259 0.64 1.53180 56.6 0.58
3 * -1.080 0.08 0.74
4 * -1.946 0.25 1.58300 30.0 0.79
5 * 3.331 0.29 0.94
6 * -2.667 0.32 1.53180 56.6 1.03
7 * -5.320 0.05 1.10
8 * -5.988 0.56 1.53180 56.6 1.13
9 * -0.912 0.05 1.19
10 * 1.001 0.35 1.53 180 56.6 1.51
11 * 0.561 1.04 1.86
12 ∞ 0.10 1.51630 64.2 2.30
13 ∞ 2.30

Table 32 below shows aspheric coefficients of the lens surfaces of the imaging lens of Example 11.
[Table 32]
Second side
K = -0.15598E + 02, A4 = -0.96141E-01, A6 = -0.14147E + 00, A8 = -0.61562E + 00,
A10 = 0.32887E-01
Third side
K = -0.10671E + 01, A4 = -0.53883E-01, A6 = -0.20934E + 00, A8 = 0.12881E-01,
A10 = -0.27916E + 00
4th page
K = -0.19187E + 01, A4 = -0.13833E + 00, A6 = -0.32903E-02, A8 = 0.14545E + 00,
A10 = 0.25683E-01
5th page
K = -0.73675E + 01, A4 = -0.87028E-01, A6 = 0.45245E-01, A8 = -0.42316E-01,
A10 = 0.26065E-01, A12 = -0.23414E-02
6th page
K = -0.83711E + 01, A4 = 0.12794E + 00, A6 = -0.14837E + 00, A8 = 0.11556E + 00,
A10 = -0.12448E-01, A12 = -0.59167E-02
7th page
K = 0, A4 = -0.25193E-01, A6 = 0.36607E-02, A8 = -0.47563E-03,
A10 = -0.14483E-03, A12 = 0.31376E-03
8th page
K = 0, A4 = 0.17751E-01, A6 = -0.67343E-02, A8 = -0.12759E-02,
A10 = -0.36683E-03, A12 = 0.48194E-03
9th page
K = -0.40158E + 01, A4 = -0.97332E-01, A6 = 0.78916E-01, A8 = -0.29735E-01,
A10 = 0.23610E-01, A12 = 0.44100E-03
10th page
K = -0.14381E + 01, A4 = -0.29100E + 00, A6 = 0.66619E-01, A8 = -0.57316E-02,
A10 = -0.50626E-03, A12 = 0.30190E-03
11th page
K = -0.24117E + 01, A4 = -0.16699E + 00, A6 = 0.66326E-01, A8 = -0.20086E-01,
A10 = 0.35344E-02, A12 = -0.28836E-03

Single lens data of Example 11 are shown in Table 33 below.
[Table 33]
Lens Start surface Focal length (mm)
1 2 1.608
2 4 -2.071
3 6 -10.493
4 8 1.947
5 10 -3.310

  FIG. 24 is a cross-sectional view of the imaging lens 1110 (10) of Example 11. The imaging lens 1110 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a biconcave negative both aspherical lens in the vicinity of the optical axis OA. The third lens L3 is a negative meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  25A to 25C show the spherical aberration, astigmatism, and distortion of the imaging lens 1110 of Example 11. FIG. 25D and 25E show the meridional coma aberration of the imaging lens 1110 of Example 11. FIG.

Example 12
The overall specifications of Example 12 are shown below.
f = 2.4mm
fB = 0.17mm
F = 2.4
2Y = 4.6mm
2ω = 87.4 °
ENTP = 0mm
EXTP = -2.83mm
H1 = 0.48mm
H2 = -2.24mm

Table 34 shows lens data of Example 12.
[Table 34]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.07 0.50
2 * 5.177 0.36 1.54470 56.2 0.51
3 * -2.203 0.05 0.61
4 * 3.679 0.25 1.63200 23.4 0.72
5 * 1.254 0.14 0.83
6 * 1.708 0.37 1.54470 56.2 0.91
7 * 3.611 0.32 0.95
8 * -1.332 0.44 1.54470 56.2 0.99
9 * -0.705 0.05 1.14
10 * 0.649 0.28 1.54470 56.2 1.63
11 * 0.408 0.99 1.85
12 ∞ 0.10 1.51630 64.1 2.30
13 ∞ 2.30

Table 35 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 12.
[Table 35]
Second side
K = -0.50000E + 02, A4 = -0.16900E + 00, A6 = 0.15632E + 00, A8 = -0.22708E + 01,
A10 = 0.41268E + 01, A12 = -0.25870E + 01, A14 = -0.57449E + 00
Third side
K = 0.81104E + 01, A4 = 0.25347E-01, A6 = -0.41988E + 00, A8 = 0.72073E + 00,
A10 = 0.50376E + 00, A12 = -0.44830E + 01, A14 = 0.76056E + 01
4th page
K = -0.19600E + 01, A4 = -0.15720E + 00, A6 = 0.93498E-01, A8 = -0.26303E + 00,
A10 = 0.20215E + 00, A12 = 0.76724E + 00, A14 = -0.11451E + 01
5th page
K = -0.90983E + 01, A4 = 0.51158E-01, A6 = -0.15787E-01, A8 = -0.26595E + 00,
A10 = 0.20096E + 00, A12 = 0.82963E-01, A14 = -0.28542E + 00
6th page
K = -0.15670E + 02, A4 = -0.10151E-02, A6 = -0.54245E-02, A8 = 0.44138E-01,
A10 = 0.44264E-01, A12 = -0.26275E-02, A14 = -0.60770E-01
7th page
K = 0.11721E + 02, A4 = -0.10896E + 00, A6 = -0.10557E + 00, A8 = -0.18035E-02,
A10 = -0.15974E-01, A12 = -0.23780E-01, A14 = 0.93251E-01
8th page
K = -0.19801E + 02, A4 = 0.12478E + 00, A6 = -0.41253E-01, A8 = -0.50633E-01,
A10 = -0.39279E-01, A12 = -0.12592E-01, A14 = 0.65867E-02
9th page
K = -0.43111E + 01, A4 = -0.12286E + 00, A6 = 0.21603E + 00, A8 = -0.31160E-01,
A10 = -0.20213E-01, A12 = -0.13422E-01, A14 = 0.71944E-02
10th page
K = -0.35398E + 01, A4 = -0.21151E + 00, A6 = 0.50564E-01, A8 = -0.15877E-03,
A10 = -0.32883E-02, A12 = 0.15850E-02, A14 = -0.24928E-03
11th page
K = -0.30780E + 01, A4 = -0.17726E + 00, A6 = 0.69545E-01, A8 = -0.17504E-01,
A10 = 0.20747E-02, A12 = -0.11872E-03, A14 = 0.72504E-05

Single lens data of Example 12 are shown in Table 36 below.
[Table 36]
Lens Start surface Focal length (mm)
1 2 2.887
2 4 -3.135
3 6 5.569
4 8 2.209
5 10 -3.440

  FIG. 26 is a cross-sectional view of the imaging lens 1210 (10) of Example 12. The imaging lens 1210 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a double meniscus aspherical lens that is convex toward the object side in the vicinity of the optical axis OA. The third lens L3 is a positive meniscus aspheric lens that is convex toward the object side in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 27A to 27C show spherical aberration, astigmatism, and distortion of the imaging lens 1210 of Example 12. FIG. FIGS. 27D and 27E show the meridional coma aberration of the imaging lens 1210 of the twelfth embodiment.

Example 13
The overall specifications of Example 13 are shown below.
f = 2.4mm
fB = 0.19mm
F = 2.6
2Y = 4.6mm
2ω = 88 °
ENTP = 0mm
EXTP = -2.81mm
H1 = 0.48mm
H2 = -2.22mm

Table 37 shows lens data of Example 13.
[Table 37]
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ 0.06 0.46
2 * 3.808 0.35 1.54470 56.2 0.47
3 * -2.609 0.05 0.58
4 * 4.239 0.25 1.63200 23.4 0.66
5 * 1.261 0.14 0.78
6 * 1.758 0.38 1.54470 56.2 0.87
7 * 4.723 0.31 0.93
8 * -1.286 0.45 1.54470 56.2 0.99
9 * -0.662 0.05 1.13
10 * 0.669 0.28 1.54470 56.2 1.60
11 * 0.400 0.98 1.83
12 ∞ 0.10 1.51630 64.1 2.30
13 ∞ 2.30

Table 38 below shows the aspheric coefficients of the lens surfaces of the imaging lens of Example 13.
[Table 38]
Second side
K = -0.19749E + 02, A4 = -0.10891E + 00, A6 = 0.52081E-01, A8 = -0.95179E + 00,
A10 = -0.35358E + 00, A12 = 0.34089E + 01, A14 = -0.57449E + 00
Third side
K = 0.10100E + 02, A4 = 0.85220E-01, A6 = -0.33374E + 00, A8 = -0.57820E-01,
A10 = 0.79697E + 00, A12 = 0.17504E + 00, A14 = -0.20554E + 01
4th page
K = 0.43336E + 01, A4 = -0.14674E + 00, A6 = 0.10542E + 00, A8 = -0.26582E + 00,
A10 = -0.69368E-01, A12 = 0.34531E + 00, A14 = 0.40819E-01
5th page
K = -0.10668E + 02, A4 = 0.53038E-01, A6 = 0.25583E-02, A8 = -0.26937E + 00,
A10 = 0.13555E + 00, A12 = 0.15215E-01, A14 = -0.15305E + 00
6th page
K = -0.16296E + 02, A4 = -0.29257E-01, A6 = 0.24615E-01, A8 = 0.57492E-01,
A10 = 0.31335E-01, A12 = 0.55717E-02, A14 = -0.81306E-01
7th page
K = 0.12410E + 02, A4 = -0.90128E-01, A6 = -0.10784E + 00, A8 = -0.14369E-01,
A10 = 0.10195E-01, A12 = 0.20757E-01, A14 = 0.10470E + 00
8th page
K = -0.19951E + 02, A4 = 0.10483E + 00, A6 = -0.43457E-01, A8 = -0.63517E-01,
A10 = -0.42384E-01, A12 = 0.91437E-02, A14 = 0.20693E-01
9th page
K = -0.44088E + 01, A4 = -0.13320E + 00, A6 = 0.20143E + 00, A8 = -0.23778E-01,
A10 = -0.10161E-01, A12 = -0.11240E-01, A14 = 0.23899E-02
10th page
K = -0.35113E + 01, A4 = -0.21842E + 00, A6 = 0.50869E-01, A8 = 0.41276E-03,
A10 = -0.31180E-02, A12 = 0.16048E-02, A14 = -0.27790E-03
11th page
K = -0.31196E + 01, A4 = -0.17476E + 00, A6 = 0.66390E-01, A8 = -0.17414E-01,
A10 = 0.23141E-02, A12 = -0.66392E-04, A14 = -0.12412E-04

The single lens data of Example 13 is shown in Table 39 below.
[Table 39]
Lens Start surface Focal length (mm)
1 2 2.898
2 4 -2.936
3 6 4.916
4 8 2.000
5 10 -2.892

  FIG. 28 is a sectional view of the imaging lens 1310 (10) of Example 13. The imaging lens 1310 (10) includes an aperture stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. The first to fifth lenses L1 to L5 are made of resin. The first lens L1 is a biconvex positive both aspherical lens in the vicinity of the optical axis OA. The second lens L2 is a double meniscus aspherical lens that is convex toward the object side in the vicinity of the optical axis OA. The third lens L3 is a positive meniscus aspheric lens that is convex toward the object side in the vicinity of the optical axis OA. The fourth lens L4 is a positive meniscus aspherical lens that is convex toward the image side in the vicinity of the optical axis OA. The fifth lens L5 is a negative meniscus both aspherical lens convex toward the object side in the vicinity of the optical axis OA. A parallel plate F is disposed between the fifth lens L5 and the imaging surface I. The parallel plate F is assumed to be an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.

  FIGS. 29A to 29C show spherical aberration, astigmatism, and distortion of the imaging lens 1310 of Example 13. FIG. 29D and 29E show the meridional coma aberration of the imaging lens 1310 of Example 13. FIG.

Table 40 below summarizes the values of Examples 1 to 13 corresponding to the conditional expressions (1) to (7) for reference.
[Table 40]

  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.

  In recent years, as a method of mounting an image pickup apparatus at a low cost (production cost) and in large quantities, an IC (integrated circuit) chip or other electronic components and optical elements are mounted on a substrate on which solder has been potted or built in advance. A technique has been proposed in which an electronic component and an optical element are simultaneously mounted on a substrate by performing a reflow process (heating process) while being placed and melting solder. In order to mount using such a reflow process, it is necessary to heat an optical element to about 200-260 degreeC with an electronic component. Under such a high temperature, there is a problem that a lens using a thermoplastic resin is thermally deformed or discolored and its optical performance is deteriorated. As one of the methods for solving such a problem, a technique has been proposed in which a glass mold lens having excellent heat resistance is used to achieve both miniaturization and optical performance in a high temperature environment. However, since glass mold lenses are generally more expensive than lenses using thermoplastic resins, there is a problem that it is not possible to meet the demand for cost reduction of imaging devices. Therefore, by using an energy curable resin as the material of the imaging lens 10, a decrease in optical performance when exposed to a high temperature can be reduced as compared with a lens using a thermoplastic resin such as polycarbonate or polyolefin. . Such an energy curable resin is effective for the reflow treatment, and is easier to manufacture and less expensive than the glass mold lens. Thereby, both low cost and mass productivity of the imaging device incorporating the imaging lens 10 can be achieved. The energy curable resin refers to both a thermosetting resin and an ultraviolet curable resin.

  A plastic material in which inorganic particles are dispersed can also be used for manufacturing the lenses L1 to L5 of Examples 1 to 13. Thereby, it is possible to further suppress the image point position fluctuation when the temperature of the entire imaging lens 10 system changes.

  In Examples 1 to 13, the principal ray incident angle of the light beam incident on the imaging surface I of the photoelectric conversion unit 51a provided in the imaging device 51 is designed to be sufficiently small in the peripheral portion of the imaging surface I. Absent. However, with recent technology, it has become possible to reduce shading (unevenness of brightness) by reviewing the arrangement of the color filters of the image sensor 51 and the on-chip microlens array. Specifically, if the pitch of the arrangement of the color filters and the on-chip microlens array is set slightly smaller than the pixel pitch of the image pickup surface I of the image pickup device 51, the pixel is closer to the periphery of the image pickup surface I. The color filter and the on-chip microlens array shift to the optical axis OA side of the imaging lens 10. Therefore, the obliquely incident light beam can be efficiently guided to the light receiving portion (imaging surface) of each pixel. Thereby, the shading which generate | occur | produces in the image pick-up element 51 can be restrained small.

  In addition, although not shown in the drawings, it is also within the scope of the present invention to add a dummy lens having substantially no power to the imaging lens 10 of the embodiment.

  Note that the meaning of the paraxial radius of curvature described in the claims, examples, etc. is the vicinity of the center of the lens (specifically, the center within 10% of the lens outer diameter) in the actual lens measurement scene. The approximate curvature radius when the shape measurement value in the region) is fitted by the method of least squares can be regarded as the paraxial curvature radius. For example, when a secondary aspherical coefficient is used, a curvature radius that takes into account the secondary aspherical coefficient in the reference curvature radius of the aspherical definition formula can be regarded as a paraxial curvature radius (for example, reference literature). (See pages 41 to 42 of “Lens Design Method” by K. Matsui, Kyoritsu Publishing Co., Ltd.).

F ... Parallel plate, I ... Imaging surface, OA ... Optical axis, OP ... Opening, PC ... Tablet, S1 ... Object side surface, 10 ... Imaging lens, 50 ... Camera module (imaging device), 51 ... Imaging device, 54 ... Lens barrel unit, 100 ... Imaging unit, 103 ... Control unit, 105 ... Optical system drive unit, 107 ... Image sensor drive unit, 108 ... Image memory, 300 ... Mobile terminal, 301 ... Control unit, 320 ... Display operation unit, 340 ... Wireless communication unit

Claims (9)

An imaging lens for forming a subject image on a photoelectric conversion unit of an image sensor, in order from the object side,
A first lens having positive refractive power and having a convex surface facing the image side;
A second lens having an aspheric shape on at least one surface;
A third lens having an aspheric shape on at least one surface;
A fourth lens having a positive refractive power;
A fifth lens having negative refractive power in the vicinity of the optical axis,
At least one surface of the fifth lens has an aspheric shape and has an inflection point at a position other than the intersection with the optical axis,
An imaging lens satisfying the following conditional expression:
0.14 <(r1 + r2) / (r1-r2) <3 (1)
0 <f / f45 <5 (2)
0.015 <d4 / L <0.25 (3)
2ω> 76 ° (4)
However,
r1: radius of curvature of the first lens object side surface r2: radius of curvature of the first lens image side surface f: focal length of the entire imaging lens system f45: combined focal length of the fourth lens and the fifth lens d4: second lens and first lens Distance on the optical axis with the three lenses L: Distance on the optical axis from the most object-side lens surface to the image-side focal point of the entire imaging lens system (parallel plate is the air equivalent length)
ω: Maximum half angle of view The imaging lens according to claim 1, wherein the second lens has a negative refractive power and satisfies the following conditional expression.
-2 <f / f2 <0 (5)
However,
f: Focal length of the entire imaging lens system f2: Focal length of the second lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.5 <f1 / f4 <3.0 (6)
However,
f1: Focal length of the first lens f4: Focal length of the fourth lens   The imaging lens according to claim 1, wherein the fourth lens has a shape with a convex surface facing the image side.   5. The imaging lens according to claim 1, wherein the fifth lens has a shape with a concave surface facing the image side in the vicinity of the optical axis.   The imaging lens according to claim 1, further comprising an aperture stop on an object side from an object side surface of the second lens.   The imaging lens according to any one of claims 1 to 6, further comprising a lens having substantially no power. The imaging lens according to any one of claims 1 to 7,
An image pickup apparatus comprising: the image pickup device that photoelectrically converts an image formed on an image pickup surface by the image pickup lens.   A portable terminal comprising the imaging device according to claim 8.

Images