WO2013168535A1

WO2013168535A1 - Imaging lens and imaging device

Info

Publication number: WO2013168535A1
Application number: PCT/JP2013/061576
Authority: WO
Inventors: 稔桑名
Original assignee: コニカミノルタ株式会社
Priority date: 2012-05-09
Filing date: 2013-04-19
Publication date: 2013-11-14

Abstract

Provided is an imaging lens such that the lens can be made thin without formability being affected and such that when assembled into an imaging deviceinterference with the surrounding components can be minimized. Also provided is an imaging device using the imaging lens. A part of the edge portion (KB1) of a first lens (L1) is extended in the optical axis direction toward a second lens (L2) to define an extended portion (EX1) so that the shape of the first lens (L1) on the object side can remain unchanged. Therefore, the object side panel (HD1) of a lens frame (HD) for holding the imaging lens does not need to be worked, and the length of the lens frame (HD) in the optical axis direction can be shortened. Further, forming a gate section (GT1) on the extended portion (EX1) of the first lens (L1) in a direction orthogonal to the optical axis increases the cross-sectional area of the gate section (GT1) and evens out the inflow of a resin material through a flow channel which includes the gate section (GT1) during molding, and thereby increases the formability. Further, the extended portion (EX1) is housed in the thin wall part (TH2) provided on the edge portion (KB2) of the second lens (L2) which is disposed so as to have the same optical axis as the first lens (L1), and thus the inter-axial distance between the first lens (L1) and the second lens (L2) does not need to be extended. Therefore, providing the extended portion (EX1) favorably increases degrees of freedom in the optical design for an imaging lens.

Description

Imaging lens and imaging apparatus

The present invention relates to an imaging lens and an imaging device, and in particular, an imaging lens suitable for an imaging device using a solid-state imaging device such as a CCD (Charge Coupled Devices) type image sensor or a CMOS (Complementary Meta 1-oxide Semiconductor) type image sensor, and The present invention relates to an imaging apparatus using the same.

Compact and thin imaging devices are now installed in portable terminals that are compact and thin electronic devices such as mobile phones and PDAs (Personal Digital Assistants), which allows not only audio information but also image information to be sent to remote locations. It is possible to transmit to each other.

As an image pickup element used in these image pickup apparatuses, a solid-state image pickup element such as a CCD type image sensor or a CMOS type image sensor is used. In recent years, the number of pixels of an image sensor has been increased, and higher resolution and higher performance have been achieved. Further, as a lens for forming a subject image on these image pickup elements, a lens formed of a resin suitable for mass production has been used for further cost reduction.

However, recently, the demand for thin portable terminals typified by smartphones has been rapidly expanding, and the demand for further downsizing of imaging lenses for imaging devices installed in these devices has become increasingly severe. Therefore, the thickness of the lens in the optical axis direction tends to be thin.

Here, when the thickness in the optical axis direction of the lens is reduced, the thickness of the edge portion of the lens is generally reduced. However, this is provided on the outer periphery of the edge portion in order to flow the resin material into the cavity of the mold at the time of molding. The gate thickness is also inevitably reduced, which may cause defective filling of the resin material and generation of welds, and may cause molding problems such as failure to ensure the accuracy of the surface shape and thickness.

On the other hand, Patent Document 1 discloses a lens in which a part of the edge of the lens is raised from the outer periphery to the optical surface, and a gate is provided there to secure a flow rate of resin flowing from the gate. .

Japanese Patent No. 3504752

However, when the lens disclosed in Patent Document 1 is used as the first lens closest to the subject, the lens frame covering the lens is partially thinned to avoid interference with a part of the raised edge portion. There is a need to. However, even if the thickness is partially reduced, in order to secure a margin in consideration of manufacturing errors of the lens frame, it is necessary to increase the thickness of the lens frame adjacent to the object side of the first lens to some extent. As a result, the imaging apparatus is increased in size, and even if a part of the edge portion is raised in order to reduce the thickness of the folding lens, there is a problem that the effect of downsizing cannot be obtained as a whole. In some cases, it may be desired to dispose the stop on the object side of the first lens. However, if a part of the edge is raised asymmetrically, the stop may not be properly disposed at the design position.

The present invention has been made in view of such a situation, and an imaging lens capable of reducing the thickness of the lens without affecting moldability and suppressing interference with surrounding components when assembled in an imaging device. An object of the present invention is to provide an imaging apparatus using the same.

The imaging lens according to claim 1, wherein a part of the edge portion of the first lens is extended in the optical axis direction to be an extension portion, and the extension portion is arranged so that the optical axis is aligned with the first lens. The second lens is housed in a relief provided at the edge of the second lens, and a gate is provided at the extension of the first lens.

According to the present invention, a part of the edge portion of the first lens is extended in the optical axis direction toward the second lens side so as to be an extension portion. Therefore, on the object side of the first lens, Since the shape can be unchanged, the length of the lens frame holding the imaging lens in the optical axis direction can be shortened. On the other hand, by forming the gate in the extension portion, the cross-sectional area of the gate can be enlarged, the flow of the resin material flowing in through the gate can be made smooth, and the moldability can be improved. Further, since the extension portion is accommodated in a relief portion provided at the edge portion of the second lens that is arranged in alignment with the first lens, the first lens and the second lens There is no need to increase the inter-axis distance, and the optical design of the imaging lens is not limited by providing the extension. In the present specification, the “edge portion” refers to a portion outside the optical surface of the lens in the direction perpendicular to the optical axis.

The imaging lens according to claim 2 is characterized in that, in the invention according to claim 1, the gate of the second lens is provided at a position different from the escape portion.

The thickness of the portion of the second lens where the relief portion is provided is thin in order to accommodate the extension portion. Therefore, by providing the gate of the second lens at a position different from the escape portion, the cross-sectional area of the gate is ensured, thereby making it possible to smoothly flow the resin material flowing in through the gate, Formability can be improved.

According to a third aspect of the present invention, in the imaging lens according to the first or second aspect, the extension portion of the first lens moves away from the second lens toward the center of the first lens. It has the taper part which inclined like this.

By providing the taper portion, the resin material flowing in from the gate can smoothly enter the cavity where the optical surface is transferred, and the moldability of the optical surface can be improved.

According to a fourth aspect of the present invention, in the imaging lens according to any one of the first to third aspects, the extension portion of the first lens is an annular portion having a notch, and the second lens is a cylinder. It has a part, The said annular part and the said cylindrical part are fitted, It is characterized by the above-mentioned.

The optical axes of the first lens and the second lens can be accurately aligned by fitting the annular portion and the cylindrical portion. This is particularly effective when the decentering sensitivity of the first lens and the second lens is high. In this case, the outer periphery of the cylindrical portion becomes the escape portion.

The imaging lens according to claim 5 is the invention according to any one of claims 1 to 4, wherein a plurality of extension portions of the first lens are provided at predetermined intervals along the circumferential direction. Correspondingly, a plurality of relief portions of the second lens are provided.

The extension part and the escape part may be provided not only as one set but also as a plurality of sets.

According to a sixth aspect of the present invention, there is provided the imaging lens according to the fifth aspect of the invention, wherein the first lens is changed by changing the combination of the relief portions of the second lens in which the extension portion of the first lens is accommodated. The relative phase angle around the optical axis of the second lens and the second lens can be changed.

For example, the decentering or coma aberration of the first lens and the second lens may be canceled by changing the relative phase angle around the optical axis of the first lens and the second lens. . On the other hand, if the combination of the relief portions of the second lens in which the extension portion of the first lens is accommodated can be changed, the relative rotation around the optical axis of the first lens and the second lens can be changed. The phase angle can be changed, which makes it possible to cancel decentration and coma.

According to a seventh aspect of the present invention, in the invention of the first aspect, the edge portion of the first lens has a relief portion, the second lens has an extension portion, and the second lens The lens extension portion is accommodated in the relief portion of the first lens, and a gate is provided in the extension portion of the second lens.

Thereby, the edge portion of the first base lens and the edge portion of the second lens have complementary shapes, and the extension portions and the escape portions can be combined.

According to an eighth aspect of the present invention, in the imaging lens of the first aspect, in the first lens, a plurality of the extension portions are provided at predetermined intervals along a circumferential direction, and the extension portions are provided. Between the extension portions, and in the second lens, a plurality of the extension portions are provided at predetermined intervals along a circumferential direction, and the clearance portion is the escape portion. Features.

For example, the decentering or coma aberration of the first lens and the second lens may be canceled by changing the relative phase angle around the optical axis of the first lens and the second lens. . On the other hand, if the combination of the extension part and the escape part of the first lens and the combination of the escape part and the extension part of the second lens can be changed, the optical axis around the first lens and the second lens is changed. The relative phase angle can be changed, so that eccentricity and coma aberration can be canceled.

An imaging lens according to a ninth aspect has at least four lenses in the invention according to any one of the first to eighth aspects, and the first lens is disposed closest to the object side and has a positive refractive power. The second lens is a lens disposed second from the object side and having a negative refractive power.

In an imaging lens having four or five or more lenses, the lens on the object side tends to be thin. Therefore, the first lens is a lens that is disposed closest to the object side and has a positive refractive power, and the second lens is a lens that is disposed second from the object side and has a negative refractive power. Thus, the effects of the present invention can be further exhibited.

An imaging device according to a tenth aspect has the imaging lens according to any one of the first to ninth aspects.

According to the present invention, it is possible to provide an imaging lens capable of reducing the thickness of the lens without affecting moldability and suppressing interference with surrounding components when assembled to the imaging device, and an imaging device using the imaging lens. Can do.

It is the schematic of portable terminal CU including imaging device LU concerning this embodiment. It is a perspective view of the 1st lens L1 concerning 1st Embodiment. It is the figure which looked at the 1st lens L1 from the object side to the optical axis direction. It is the figure which looked at the 1st lens L1 from the image side to the optical axis direction. It is a perspective view of the 2nd lens L2 concerning 1st Embodiment. It is the figure which looked at the 2nd lens L2 from the object side to the optical axis direction. It is a figure which shows the state cut | disconnected in the position of the VII-VII line of FIG. 3 combining the 1st lens L1 and the 2nd lens L2. It is a figure which shows the state cut | disconnected in the position of the VIII-VIII line of FIG. 3 combining the 1st lens L1 and the 2nd lens L2. It is a figure which shows the state before the combination of the 1st lens L1 and the 2nd lens L2 which are shown in FIG. It is the figure seen from the image side of the 1st lens L1 concerning a modification in the optical axis direction. It is a figure which shows the state cut | disconnected in the position of the XI-XI line | wire of FIG. 10 combining the 1st lens L1 and the 2nd lens L2. It is the figure seen in the optical axis direction from the image side of the 1st lens L1 concerning another modification. It is the figure which looked at the 1st lens L1 concerning 2nd Embodiment from the image side in the optical axis direction. It is the figure which looked at the 2nd lens L2 concerning 2nd Embodiment from the object side in the optical axis direction. It is a figure which shows the state cut | disconnected in the position of the XV-XV line | wire of FIG. 13, 14 combining the 1st lens L1 and the 2nd lens L2. It is a figure which shows the state cut | disconnected in the position of the XVI-XVI line | wire of FIG. 13, 14 combining the 1st lens L1 and the 2nd lens L2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a mobile terminal CU including a cross-sectional view of the imaging device LU according to the present embodiment. As illustrated in FIG. 1, the imaging device LU includes a CMOS image sensor SR as a solid-state imaging device having a photoelectric conversion unit, and an imaging lens that causes the photoelectric conversion unit (light receiving surface) SS of the image sensor SR to capture a subject image. LN and the board | substrate ST which has the terminal for an external connection (not shown) which hold | maintains the image sensor SR and transmits / receives the electrical signal are provided, and these are integrally formed.

The imaging lens LN, in order from the object side (left side in FIG. 1), a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, and a third lens having a positive refractive power. Lens L3 and a fourth lens L4 having a negative refractive power. These lenses are bonded and held coaxially by a cylindrical lens frame HD after the end portions are butted together. A donut plate-shaped light shielding member SH1 is provided between the first lens L1 and the second lens L2, and a donut plate-shaped light shield is provided between the second lens L2 and the third lens L3. A member SH2 is interposed, and a donut plate-shaped light blocking member SH3 is interposed between the third lens L3 and the fourth lens L4. It is optional to provide five or more lenses. The object side of the lens frame HD is shielded by an object side plate portion HD1 having an aperture stop S at the center.

In the image sensor SR, a photoelectric conversion unit SS as a light receiving unit in which pixels (photoelectric conversion elements) are two-dimensionally arranged is formed in the center of a plane on the light receiving side, and signal processing (not shown) is performed. Connected to the circuit. Such a signal processing circuit includes a drive circuit unit that sequentially drives each pixel to obtain a signal charge, an A / D conversion unit that converts each signal charge into a digital signal, and a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like. A number of pads (not shown) are arranged near the outer edge of the plane on the light receiving side of the image sensor SR, and are connected to the substrate ST via wires (not shown). The image sensor SR converts the signal charge from the photoelectric conversion unit SS into an image signal such as a digital YUV signal, and outputs the image signal to a predetermined circuit on the substrate ST via a wire (not shown). Here, Y is a luminance signal, U (= RY) is a color difference signal between red and the luminance signal, and V (= BY) is a color difference signal between blue and the luminance signal. Note that the solid-state imaging device is not limited to the CMOS image sensor, and other devices such as a CCD may be used.

The substrate ST that supports the image sensor SR is communicably connected to the image sensor SR by a wiring (not shown).

The substrate ST is connected to an external circuit (here, the signal processing unit 1 of the mobile terminal CU on which the imaging device LU is mounted) via an external connection terminal, and a voltage or clock for driving the image sensor SR from the external circuit. It is possible to receive a signal and to output a digital YUV signal to an external circuit.

A cylindrical casing BX is fixed to the object side surface of the substrate ST so as to enclose the lens frame HD. A male screw portion MS is provided on the outer periphery of the lens frame HD, and a female screw portion FS is provided on the inner periphery of the housing BX. By screwing the male screw portion MS and the female screw portion FS together, the housing BX On the other hand, the lens frame HD, that is, the imaging lenses (L1 to L4) is attached to be displaceable in the optical axis direction.

FIG. 2 is a perspective view of the first lens L1 according to the first embodiment. FIG. 3 is a diagram of the first lens L1 viewed from the object side in the optical axis direction. FIG. 4 is a diagram of the first lens L1 viewed from the image side in the optical axis direction. In the drawing, the first lens L1 includes a central lens portion OP1, an edge portion KB1 extending in the direction orthogonal to the optical axis from the periphery of the lens portion OP1, and a lens extending in the optical axis direction from the outer periphery of the edge portion KB1. It has a substantially annular extension EX1 that is coaxial with the part OP1. As shown in FIG. 4, the extension portion EX1 having the inner diameter φ1 is partially cut away in the circumferential direction, and has a cutout portion CT1 having a width Δ1. A part of the extension portion EX1 has a flat portion FP1 having a shape cut in a tangential direction, and has a gate portion GT1 which is gate-cut here. A chamfer C is provided at the end edge of the edge KB1.

FIG. 5 is a perspective view of the second lens L2 according to the first embodiment. FIG. 6 is a diagram of the second lens L2 viewed from the object side in the optical axis direction. In the drawing, the second lens L2 has a central lens part OP2 and a peripheral part KB2 around the lens part OP2. The edge KB2 extends in the direction perpendicular to the optical axis from the periphery of the cylindrical portion CY2 that surrounds the lens portion OP2 and is coaxial with the lens portion OP2, and the cylindrical portion CY2 that has an outer diameter φ2, and has a thinner optical axis. And a thin portion (escape portion) TH2 having a directional thickness. However, a part of the thin part TH2 is raised to the object side surface of the edge part KB2 so as to be connected to the outer periphery of the cylindrical part CY2, and a raised part MT2 is formed here. The outer end of the raised portion MT2 has a flat surface portion FP2, and has a gate portion GT2 that is gate-cut here. Note that the width Δ2 of the raised portion MT2 is substantially equal to the width Δ1 of the notch portion CT1, and the outer diameter φ2 of the cylindrical portion CY2 is substantially equal to the inner diameter φ1 of the extension portion EX1. A chamfer C is provided at the end edge of the edge KB2.

FIG. 7 shows a state in which the first lens L1 and the second lens L2 are combined and cut at the position of the VII-VII line in FIG. 3, and FIG. 7 shows the state cut at the position of the VIII-VIII line in FIG. It is shown in FIG. FIG. 9 is a diagram illustrating a state before the first lens L1 and the second lens L2 are combined in the cross section illustrated in FIG. As apparent from FIG. 7, the first lens L1 and the second lens L2 are coaxially combined by fitting the extension part EX1 to the cylindrical part CY2 with the light shielding member SH1 interposed. The distal end of the extension part EX1 abuts against the thin part TH2, so that the distance between the axes of the first lens L1 and the second lens L2 is determined. At this time, by combining the raised portion MT2 with the notch portion CT1, it is possible to prevent relative rotation between the first lens L1 and the second lens L2. In such a state, the first lens L1 and the second lens L2 are fixed to each other by an adhesive (not shown) and attached to the lens frame HD. However, the first lens L1 and the second lens L2 may not be bonded at this time, but may be bonded to the frame at the end. The lenses L3 and L4 shown in FIG. 1 can have the same configuration.

According to the present embodiment, a part of the edge portion KB1 of the first lens L1 is extended in the optical axis direction toward the second lens L2 side to form the extension portion EX1, so as shown in FIG. Since the shape of the first lens L1 on the object side can be unchanged, there is no need to process the object side plate portion HD1 of the lens frame HD that holds the imaging lens, and the length of the lens frame HD in the optical axis direction is shortened. Can do. Furthermore, by forming the gate part GT1 in the direction orthogonal to the optical axis of the extension part EX1 of the first lens L1, the cross-sectional area of the gate part GT1 can be enlarged. At the time of molding, the gate is shown as shown by the dotted line in FIG. The flow of the resin material flowing in through the flow path including the part GT1 can be made smooth, and the moldability can be improved. Further, since the extension portion EX1 is accommodated in the thin portion TH2 provided in the edge portion KB2 of the second lens L2 that is arranged with the optical axis of the first lens L1, the first lens L1 and the second lens L1 are accommodated. It is not necessary to increase the distance between the lens L2 and the extension EX1 is preferable because the optical design of the imaging lens is not limited.

Furthermore, the gate portion GT2 is formed in the direction orthogonal to the optical axis of the raised portion MT2 of the second lens L2 (that is, a position different from the thin portion TH2), so that the gate portion KB2 is provided with the thin portion TH2. The cross-sectional area of GT2 can be ensured, and at the time of molding, as shown by the dotted line in FIG. 6, the flow of the resin material flowing through the flow path including the gate portion GT2 can be made smooth, and the moldability can be improved.

FIG. 10 is a diagram viewed from the image side of the first lens L1 according to the modification in the optical axis direction. FIG. 11 is a diagram illustrating a state in which the first lens L1 and the second lens L2 are combined and cut at the position of the XI-XI line in FIG. In this modification, the inner peripheral side of the extension part EX1 corresponding to the gate part GT1 is built up so as to approach the optical axis, and gradually shifts toward the object side as the optical axis is approached (from the second lens L2). A tapered portion TP1 is provided which is inclined to move away.
On the other hand, the outer periphery of the cylindrical portion CY2 of the second lens L2 according to the modification is notched corresponding to the tapered portion TP1, and the tapered portion TP2 is formed here. About another structure, it is the same as that of embodiment mentioned above.

As shown in FIG. 11, when the extension portion EX1 is fitted to the cylindrical portion CY2 with the light shielding member SH1 interposed, the taper portion TP1 faces the taper portion TP2. There is no obstacle to the combination of the first lens L1 and the second lens L2. On the other hand, by providing the taper portion TP1, the resin material flowing from the gate portion GT1 during molding can smoothly enter the cavity where the optical surface is transferred, and the moldability of the lens portion OP1 can be improved.

FIG. 12 is a diagram viewed from the image side of the first lens L1 according to another modification in the optical axis direction.
In the present modification, three extension portions EX1 provided at the edge portion KB1 of the first lens L1 are provided at equal intervals in the circumferential direction. Although not shown, three raised portions MT2 are formed in the edge portion KB2 of the second lens L2 corresponding to the three extended portions EX1. A space between the raised portions MT2 constitutes an escape portion.

The decentering and coma aberration of the first lens L1 and the second lens L2 may be canceled by changing the relative phase angle around the optical axis of the first lens L1 and the second lens L2. According to the present modification, the combination between any of the raised portions MT2 in which the extension portion EX1 of the first lens L1 is accommodated can be changed by 120 ° phase, so the first lens L1 and the second lens The relative phase angle around the optical axis of the lens L2 can be changed, so that decentration, coma, etc. can be canceled.

FIG. 13 is a diagram of the first lens L1 according to the second embodiment viewed from the image side in the optical axis direction. FIG. 14 is a diagram of the second lens L2 according to the second embodiment viewed from the object side in the optical axis direction. FIG. 15 is a diagram illustrating a state in which the first lens L1 and the second lens L2 are combined and cut at the position of the XV-XV line in FIGS. FIG. 16 is a diagram illustrating a state where the first lens L1 and the second lens L2 are combined and cut at the position of the XVI-XVI line in FIGS.

The first lens L1 and the second lens L2 according to the present embodiment have similar shapes except for the lens portion. More specifically, three extension portions EX1 provided in the edge portion KB1 of the first lens L1 are provided at equal intervals in the circumferential direction, and the edge portion KB1 between the extension portions EX1 is the extension portion EX1. The outer diameter is reduced to the inner diameter position, and the escape portion ES1 is formed. Further, the extension part EX2 provided in the edge part KB2 of the second lens L2 is provided in three places so as to be complementary to the extension part EX1, and the edge part KB2 between the extension parts EX2 is an extension part. The outer diameter is reduced to the inner diameter position of EX2, and the escape portion ES2 is formed. In the present embodiment, the second lens L2 does not form a cylindrical portion, and the gate portion GT2 is provided on the outer periphery of one extension portion EX2.

As shown in FIGS. 15 and 16, when the first lens L1 and the second lens L2 are combined with the light shielding member SH1 interposed, the extension portion EX1 of the first lens L1 is the second lens L1. While entering between the extension portions EX2 of the lens L2 and reaching the escape portion ES2, the extension portion EX2 enters between the extension portions EX1 and reaches the escape portion ES1, thereby enabling alignment of the optical axes. In addition, since the extension portion EX1 enters the escape portion ES2 and the extension portion EX2 enters the escape portion ES1, the extension portions EX1 and EX2 of the extension portions EX1 and EX2 are suppressed while suppressing the distance between the axes of the first lens L1 and the second lens L2. Since the length in the optical axis direction can be ensured, the length in the optical axis direction of the gate portions GT1 and GT2 provided on the outer periphery thereof is ensured long, and the resin material flowing in from the gate portions GT1 and GT2 during molding smoothes the optical surface. It is possible to enter the cavity to be transferred, and to improve the moldability of the lens portions OP1 and OP2.

The imaging lens LN including the first lens L1 and the second lens L2 combined in this manner is preferably used for an imaging device mounted on a digital device with an image input function (for example, a portable terminal).

In addition, when such an imaging device LU is mounted on a portable terminal CU with an image input function, the imaging device LU is usually arranged inside the body of the portable terminal CU. However, when the mobile terminal CU exhibits the camera function, the imaging device LU takes a form as necessary. For example, the unitized imaging device LU may be detachable or rotatable with respect to the main body of the mobile terminal CU.

1 includes a signal processing unit 1, a control unit 2, a memory 3, an operation unit 4, and a display unit 5 in addition to the imaging device LU.

The signal processing unit 1 performs, for example, predetermined digital image processing and image compression processing on the signal generated by the image sensor SR as necessary. The processed signal is recorded as a digital video signal in the memory 3 (semiconductor memory, optical disc, etc.), or converted into an infrared signal via a cable and transmitted to another device.

The control unit 2 is a microcomputer and performs function control such as a photographing function and an image reproduction function intensively. For example, the control unit 2 controls the imaging device LU so as to perform at least one of still image shooting and moving image shooting of a subject.

The memory 3 stores, for example, a signal generated by the image sensor SR and processed by the signal processing unit 1.

The operation unit 4 is a part including operation members such as an operation button (for example, a release button) and an operation dial (for example, a shooting mode dial), and transmits information input by the operator to the control unit 2.

The display unit 5 includes a display such as a liquid crystal monitor, and can display an image using an image signal converted by the image sensor SR or image information recorded in the memory 3.

The present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are included for those skilled in the art from the embodiments and technical ideas described in the present specification. it is obvious.

DESCRIPTION OF SYMBOLS 1 Signal processing part 2 Control part 3 Memory 4 Operation part 5 Display part BX Case C Chamfering CT1 Notch CU Portable terminal CY2 Cylindrical part ES1 Escape part ES2 Escape part EX1 Extension part EX2 Extension part FP1 Plane part FP2 Plane part FS Female screw part GT1 Gate part GT2 Gate part HD Lens frame HD1 Object side plate part KB1 Edge part KB2 Edge part L1 First lens L2 Second lens L3 Third lens L4 Fourth lens LN Imaging lens LU Imaging device MS Male thread part MT2 Raising Part OP1 Lens part OP2 Lens part S Aperture stop SH1 Light shielding member SH2 Light shielding member SH3 Light shielding member SR Image sensor SS Photoelectric conversion part ST Substrate TH2 Thin part TP1 Tapered part TP2 Tapered part

Claims

A part of the edge portion of the first lens is extended in the optical axis direction to be an extension portion, and the extension portion is provided at the edge portion of the second lens arranged in alignment with the optical axis of the first lens. An imaging lens, wherein the imaging lens is housed in an escape portion, and a gate is provided in an extension portion of the first lens.
The imaging lens according to claim 1, wherein the gate of the second lens is provided at a position different from the escape portion.
The extension portion of the first lens has a tapered portion that is inclined so as to move away from the second lens toward the center of the first lens. Imaging lens.
The extension part of the first lens is an annular part having a notch, and the second lens has a cylindrical part, and the annular part and the cylindrical part are fitted to each other. The imaging lens according to any one of claims 1 to 3.
A plurality of extension portions of the first lens are provided at predetermined intervals along the circumferential direction, and a plurality of relief portions of the second lens are provided correspondingly. The imaging lens according to any one of claims 1 to 4.
The relative phase angle around the optical axis of the first lens and the second lens can be changed by changing the combination of the relief portions of the second lens in which the extension portion of the first lens is accommodated. The imaging lens according to claim 5, wherein:
The edge portion of the first lens has a relief portion, the second lens has an extension portion, and the extension portion of the second lens is accommodated in the relief portion of the first lens. The thick image lens according to claim 1, wherein a gate is provided in an extension of the second lens.
In the first lens, a plurality of the extension portions are provided at a predetermined interval along a circumferential direction, and the space between the extension portions is the escape portion,
The said 2nd lens WHEREIN: The said extension part is provided with two or more by the predetermined space | interval along the circumferential direction, The space | interval between the said extension parts is the said escape part, The Claim 8 characterized by the above-mentioned. Imaging lens.
The lens has at least four lenses, the first lens is a lens having a positive refractive power arranged closest to the object side, and the second lens is arranged second from the object side and has negative refracting power. 9. The imaging lens according to claim 1, wherein the imaging lens is a lens having power.
An imaging apparatus comprising the imaging lens according to any one of claims 1 to 9.