CN110174743B - Image pickup lens and image pickup apparatus including the same - Google Patents
Image pickup lens and image pickup apparatus including the same Download PDFInfo
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- CN110174743B CN110174743B CN201811534312.5A CN201811534312A CN110174743B CN 110174743 B CN110174743 B CN 110174743B CN 201811534312 A CN201811534312 A CN 201811534312A CN 110174743 B CN110174743 B CN 110174743B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention provides an imaging lens and an imaging device having the same, wherein the imaging lens is small and has a wide angle of view, but FNo is bright and has high resolution, and CRA is suppressed to be small. The image pickup lens is composed of a1 st lens group having negative refractive power and a2 nd lens group having positive refractive power, which are arranged in order from the object side, the 1 st lens group is composed of one lens having negative refractive power and one lens having positive refractive power, the 2 nd lens group is composed of a 2a lens group having positive refractive power and a 2b lens group, which are arranged in order from the object side, the 2b lens group is composed of a 2b1 th lens having negative refractive power, a 2b2 th lens having positive refractive power and a 2b3 th lens, which are arranged in order from the object side, a surface on the image side of the 2b3 th lens is an aspherical shape having an extreme value at a position other than an intersection point with the optical axis, and the image pickup lens satisfies a prescribed conditional expression.
Description
Technical Field
The present invention relates to an imaging lens of an imaging device using a solid-state imaging element such as a CCD or a C-MOS, and more particularly to an imaging lens suitable for a compact imaging device.
Background
In recent years, with the increase in the number of pixels of solid-state imaging devices such as CCDs and C-MOS, imaging lenses capable of supporting high pixel resolution have been demanded. In a photographic lens mounted on an ultra-small image pickup apparatus which is widely spread in recent years and which can be easily carried or installed even in a narrow space, there is no exception to the demand for high resolution.
On the other hand, with the progress of high pixel count of solid-state imaging elements, the influence of diffraction on the deterioration of imaging performance cannot be ignored in imaging lenses. Therefore, in order to support the high pixelation, it is necessary to illuminate FNo to about 2.0 or less in addition to correct aberration well.
Further, in a subminiature imaging device, a wide-angle lens is required in the market because a wider imaging area can be obtained than a normal-angle lens. In particular, in the case of a wide angle lens, there is a case where a wide angle lens is used to capture a wide range and partially enlarge the range, and therefore, there is a strong demand for high resolution.
In addition, in a wide-Angle lens, the incidence Angle (CRA, Chief Ray Angle) of the Chief Ray at the peripheral portion of the image pickup element tends to be large, and particularly, the incidence Angle tends to be large when the lens is long and short. However, if the CRA is large, the light collecting efficiency is reduced, which causes deterioration of image quality, and also causes shortage of peripheral light amount, and it is required to suppress the CRA to about 20 ° or less.
Patent document 1: japanese Kokai publication 2014-215594
Patent document 2: japanese laid-open patent publication No. 2015-022145
Disclosure of Invention
Problems to be solved by the invention
As a lens structure which facilitates formation of a wide angle of view and suppression of CRA, various types of lenses in which a negative lens group and a positive lens group are arranged in this order from the object side have been proposed. In particular, as a bright lens having a wide angle of view of 90 ° or more and FNo of 2.0 or less, for example, patent document 1 discloses a lens having a negative lens group and a positive lens group, an angle of view of 88 °, FNo bright to 1.8, and a relatively high resolution as example 4.
However, the total lens length (distance from the 1 st surface of the lens closest to the object side to the image plane) in example 4 of patent document 1 is long enough to exceed 5 times the length of the diagonal line of the rectangular light receiving region of the solid-state imaging device (hereinafter referred to as the sensor diagonal line length), and cannot be incorporated into a super-small imaging device.
Another conventional technique is embodiment 4 of patent document 2, and proposes a wide-angle, small-sized image pickup lens in which a negative lens group and a positive lens group are arranged in this order from the object side, the angle of view is 93 °, FNo is 2.4, and the total lens length is shorter than the sensor diagonal.
However, in the imaging lens of example 4 of patent document 2, since the positive lens arranged second from the image side has a strong refractive power, coma aberration and astigmatism are much generated, and it is difficult to form a high resolution. In addition, it is configured that the negative lens group is constituted by only one negative lens and there is only one negative lens on the object side of the aperture stop. Therefore, if FNo is made bright, correction of coma aberration is difficult. The CRA greatly exceeds 20 °, and has about 30 °.
(object of the invention)
The present invention has been made in view of the above problems of the conventional imaging lens, and an object of the present invention is to provide an imaging lens which is small in size and wide in angle of view, but is bright in FNo, has high resolution, and suppresses CRA to be small, and an imaging device including the imaging lens.
Means for solving the problems
The present invention is an image pickup lens comprising a1 st lens group having negative refractive power and a2 nd lens group having positive refractive power, which are arranged in order from an object side, the 1 st lens group comprising a lens having negative refractive power and a lens having positive refractive power, the 2 nd lens group comprising a 2a lens group and a 2b lens group, which are arranged in order from the object side, the 2a lens group having positive refractive power, the 2b lens group comprising a 2b1 th lens, a 2b2 th lens and a 2b3 th lens, which are arranged in order from the object side, the 2b1 th lens having negative refractive power and the 2b2 th lens having positive refractive power,
the image-side surface of the 2b3 lens has an aspherical shape having an extremum at a position other than an intersection with the optical axis,
the imaging lens satisfies the following conditional expressions (1) and (2),
0.73≤f2b2/f≤2.40·······(1)
vd_p≤45.0··········(2)
wherein f is the focal length of the whole lens system,
f2b2 is the focal length of the 2b2 lens,
ν d _ p is an abbe number for d-line of the lens having positive refractive power of the 1 st lens group.
The present invention is also an imaging apparatus including: the camera lens; and an imaging element disposed on an image plane of the imaging lens.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, an imaging lens that is small and has a wide angle of view, but has FNo that is bright and has high resolution, and that suppresses CRA to be small, and an imaging apparatus including the imaging lens can be configured.
Drawings
Fig. 1 is a lens configuration diagram of an imaging lens according to embodiment 1 of the present invention.
Fig. 2 is various aberration diagrams of the imaging lens of embodiment 1 of the present invention.
Fig. 3 is a lens configuration diagram of an imaging lens according to embodiment 2 of the present invention.
Fig. 4 is various aberration diagrams of embodiment 2 of the imaging lens of the present invention.
Fig. 5 is a lens configuration diagram of an imaging lens according to embodiment 3 of the present invention.
Fig. 6 is various aberration diagrams of embodiment 3 of the imaging lens of the present invention.
Fig. 7 is a lens configuration diagram of embodiment 4 of the imaging lens of the present invention.
Fig. 8 is various aberration diagrams of embodiment 4 of the imaging lens of the present invention.
Fig. 9 is a lens configuration diagram of an imaging lens according to embodiment 5 of the present invention.
Fig. 10 is various aberration diagrams of embodiment 5 of the imaging lens of the present invention.
Fig. 11 is a lens configuration diagram of an imaging lens according to embodiment 6 of the present invention.
Fig. 12 is various aberration diagrams of embodiment 6 of the imaging lens of the present invention.
Fig. 13 is a lens configuration diagram of an imaging lens according to embodiment 7 of the present invention.
Fig. 14 is various aberration diagrams of embodiment 7 of the imaging lens of the present invention.
Fig. 15 is a structural diagram of an embodiment of the image pickup apparatus of the present invention.
Description of the reference numerals
F: a filter; CG: a cover glass; IMG: an image plane; STOP: an aperture stop; g1: a first lens group; g2: a second lens group; g2 a: the 2 nd lens group; g2 b: and a 2b lens group.
Detailed Description
Embodiments of the present invention will be described below.
(embodiment 1)
The 1 st embodiment of the present invention is an image pickup lens comprising a1 st lens group having negative refractive power and a2 nd lens group having positive refractive power, which are arranged in this order from an object side, wherein the 1 st lens group comprises a lens having negative refractive power and a lens having positive refractive power, the 2 nd lens group comprises a 2a lens group having positive refractive power and a 2b lens group having 2b1, 2b2 and 2b3, which are arranged in this order from the object side, wherein the 2b1 lens has negative refractive power, and the 2b2 lens has positive refractive power,
the surface on the image side of the 2b3 lens has an aspherical shape having an extreme value at a position other than an intersection with the optical axis,
the imaging lens satisfies the following conditional expressions (1) and (2),
0.73≤f2b2/f≤2.40·······(1)
vd_n≤45.0··········(2)
wherein f is the focal length of the whole lens system,
f2b2 is the focal length of the 2b2 th lens,
vd _ p is an abbe number for d-line of the lens having positive refractive power of the 1 st lens group.
According to embodiment 1 of the present invention, an imaging lens that is small and has a wide angle of view, but has FNo that is bright and has high resolution, and a small CRA can be configured, and an imaging device including the imaging lens.
According to embodiment 1 of the present invention, also by the 1 st lens group G1 having negative refractive power being composed of one lens having negative refractive power and one lens having positive refractive power, chromatic aberration of magnification and coma aberration can be corrected well. As a result, FNo can be brightened, and high resolution can be achieved.
When a lens of a type in which a negative lens group and a positive lens group are arranged in this order from the object side is to be downsized, the refractive power of the positive lens group needs to be strengthened. However, if the refractive power of each surface of the lens is strong, each aberration is likely to occur, and therefore how to assign a strong positive refractive power to each lens has a great influence on aberration correction.
In embodiment 1 of the present invention, in the 2 nd lens group G2 having strong positive refractive power, the 2 nd lens group G2a in the vicinity of the aperture stop is made to bear positive refractive power, whereby the positive refractive power of the 2 nd lens group G2b located away from the aperture stop can be weakened, and astigmatism and chromatic aberration of magnification can be suppressed.
Further, by forming the 2b1 th lens L2b1 to have negative refractive power, it is possible to correct magnification chromatic aberration, axial chromatic aberration, astigmatism, and coma aberration favorably. In particular, when a lens having negative refractive power is disposed at the position of the 2b1 th lens L2b1, both chromatic aberration of magnification and chromatic aberration on axis can be corrected well. In the 2b1 th lens L2b1 arranged third from the image plane, since the position through which the off-axis light flux passes is relatively high, the ability to correct the magnification chromatic aberration can be improved, and the magnification chromatic aberration can be corrected well.
In addition, in the 2b1 th lens L2b1, since the light beam diverged by the 1 st lens group G1 of negative refractive power passes through the 2b1 th lens L2b1 immediately after passing through the 2a th lens group of positive refractive power, the on-axis light beam also passes at a relatively high position. Thus, the correction capability of the axial chromatic aberration at the 2b 1-th lens L2b1 can be improved, so that the axial chromatic aberration can be corrected well.
In addition, by forming the 2b2 lens L2b2 as positive refractive power, the burden of strong positive refractive power of the 2 nd lens group G2 can be borne along with the 2 nd lens group G2 a. As a result, the positive refractive power in the 2a lens group G2a can be weakened, and spherical aberration, coma aberration, and axial chromatic aberration generated in the 2a lens group G2a can be suppressed, so that FNo can be brightened, and high resolution can be achieved.
The 2b3 th lens L2b3 disposed on the most image side has an aspherical surface and has an extremum at a position other than the intersection of the aspherical surface and the optical axis, so that the concave surface can be formed in a shape facing the image side in the vicinity of the optical axis, but the convex surface can be formed in a shape facing the image side in the periphery of the optically effective diameter, and as a result, the CRA in the periphery of the imaging element can be suppressed and reduced.
The conditional expression (1) is a condition for specifying a preferable range of the focal length of the 2b2 th lens L2b2 with respect to the focal length of the entire lens system, and for appropriately allocating the strong positive refractive power of the 2 nd lens group G2 to correct aberrations well.
If the refractive power is lower than the lower limit of conditional expression (1), the positive refractive power of lens L2b2 of the 2b2 is too strong, and it becomes difficult to correct astigmatism, chromatic aberration of magnification, and coma aberration satisfactorily, and high resolution is hindered, which is undesirable. In addition, since it is difficult to correct coma aberration well, it is difficult to lighten FNo.
When the upper limit of the conditional expression (1) is exceeded, the positive refractive power of the 2b2 lens L2b2 is too weak, and the strong positive refractive power of the 2 nd lens group G2 is greatly borne by the 2 nd lens group G2a, so that the amount of generation of spherical aberration and axial chromatic aberration in the 2 nd lens group G2a increases, and therefore it is difficult to correct spherical aberration and axial chromatic aberration well, which is undesirable.
The lower limit of the conditional expression (1) is preferably 0.75 or more, and more preferably 0.78 or more.
The upper limit of the conditional expression (1) is preferably 2.20 or less, more preferably 2.00 or less, more preferably 1.80 or less, more preferably 1.70 or less, more preferably 1.60 or less, more preferably 1.50 or less, more preferably 1.40 or less.
The conditional expression (2) is a condition for defining a preferable range of the abbe number of the positive lens of the 1 st lens group G1 for the d-line and for correcting the chromatic aberration of magnification well.
If the upper limit of the conditional expression (2) is exceeded, the effect of correcting chromatic aberration of magnification in the positive lens of the 1 st lens group G1 is reduced, and it is difficult to correct chromatic aberration of magnification satisfactorily, which is undesirable.
Since it is difficult to correct chromatic aberration on the axis well when the value of the conditional expression (2) is small, the lower limit value may be set to 15.0 or more and 18.0 or more.
In order to obtain more favorable effects, the upper limit of the conditional expression (2) is preferably 42.0 or less, more preferably 40.0 or less, more preferably 38.0 or less, more preferably 36.0 or less, more preferably 34.0 or less, more preferably 32.0 or less, more preferably 30.0 or less, and more preferably 28.0 or less.
(embodiment 2)
Embodiment 2 of the present invention is an imaging lens that satisfies the following conditional expression (3).
-1.42≤f2b1/f≤-0.46·····(3)
Wherein f is the focal length of the whole lens system,
f2b1 is the focal length of the 2b1 th lens.
The conditional expression (3) is for specifying a preferable range of the focal length of the 2b1 th lens L2b1 with respect to the focal length of the entire system.
If the refractive power is lower than the lower limit of conditional expression (3), the negative refractive power of lens L2b1 of the 2b1 is too weak, and it is difficult to correct the chromatic aberration of magnification, chromatic aberration on axis, and astigmatism well, and thus high resolution is inhibited, which is undesirable.
If the negative refractive power exceeds the upper limit of conditional expression (3), the negative refractive power of the 2b1 th lens L2b1 is too strong, and astigmatism and coma aberration cannot be corrected satisfactorily, which is undesirable.
The lower limit of the conditional expression (3) is preferably-1.40 or more, more preferably-1.38 or more, more preferably-1.36 or more, more preferably-1.34 or more, more preferably-1.30 or more, more preferably-1.28 or more.
The upper limit of the conditional expression (3) is preferably-0.48 or less, more preferably-0.50 or less, more preferably-0.51 or less, more preferably-0.53 or less, and more preferably-0.55 or less.
(embodiment 3)
In accordance with embodiment 3 of the present invention, an image pickup lens is characterized in that an aperture stop is disposed between the 1 st lens group and the 2 nd lens group, or an aperture stop is disposed in the 2 nd lens group.
By disposing the aperture stop between the 1 st lens group G1 and the 2 nd lens group G2 or in the 2 nd lens group G2, it is possible to simultaneously suppress a CRA around the image pickup element and increase the resolution. By disposing one lens having negative refractive power and one lens having positive refractive power on the object side of the aperture stop, coma aberration and magnification chromatic aberration can be corrected well, and high resolution can be achieved. Further, by disposing the aperture stop between the 1 st lens group G1 and the 2 nd lens group G2 or in the 2 nd lens group a, a relatively long distance from the aperture stop to the image plane can be obtained even in a short overall length. As a result, CRA in the periphery of the imaging element can be suppressed. When the aperture stop is disposed between the 1 st lens group G1 and the 2 nd lens group G2, CRA is more easily suppressed, and the effective diameter of the object side lens can be reduced, which is more preferable.
The arrangement of the aperture stop between the 1 st lens group and the 2 nd lens group means that the aperture stop is located on the optical axis on the image side of the intersection point between the optical axis and the image side surface of the lens arranged closest to the image side in the 1 st lens group, and on the object side of the intersection point between the optical axis and the object side surface of the lens arranged closest to the object side in the 2 nd lens group.
The arrangement of the aperture stop in the 2a lens group means that the aperture stop is located on the image side of the intersection between the object side surface of the lens arranged on the most object side in the 2a lens group and the optical axis, and is located on the object side of the intersection between the image side surface of the lens arranged on the most image side in the 2a lens group and the optical axis.
(embodiment 4)
Embodiment 4 of the present invention is an imaging lens that satisfies the following conditional expression (4).
0.38≤f2a/f2b2≤1.57·····(4)
Wherein f2a is the focal length of the 2a lens group,
f2b2 is the focal length of the 2b2 lens.
The conditional expression (4) is a condition for defining a preferable range of the focal length of the 2 a-th lens G2a with respect to the focal length of the 2b2 lens L2b2, and for appropriately allocating the strong positive refractive power of the 2 nd lens group G2 to favorably correct aberrations.
If the refractive power is lower than the lower limit of the conditional expression (4), the strong positive refractive power of the 2 nd lens group G2 is largely borne by the 2 nd lens group G2a, and the amount of generation of spherical aberration and axial chromatic aberration in the 2 nd lens group G2a increases, making it difficult to correct spherical aberration and axial chromatic aberration satisfactorily, which is undesirable. In addition, since it is difficult to correct spherical aberration well, it is difficult to lighten FNo.
When the upper limit of the conditional expression (4) is exceeded, the strong positive refractive power of the 2 nd lens group G2 is greatly borne by the 2b2 th lens L2b2, and the amount of astigmatism, chromatic aberration of magnification, and coma aberration generated in the 2b2 th lens L2b2 becomes large, and it becomes difficult to correct these aberrations well, which is undesirable.
The lower limit of the conditional expression (4) is preferably 0.45 or more, more preferably 0.52 or more, more preferably 0.59 or more, more preferably 0.66 or more, and more preferably 0.73 or more. The upper limit of conditional expression (4) is preferably 1.50 or less, more preferably 1.45 or less, more preferably 1.40 or less, more preferably 1.36 or less, more preferably 1.30 or less, more preferably 1.25 or less, more preferably 1.20 or less, more preferably 1.15 or less, more preferably 1.10 or less.
(embodiment 5)
Embodiment 5 of the present invention is an imaging lens that satisfies the following conditional expression (5).
1.9≤fp/f≤12.4·······(5)
Wherein f is the focal length of the whole lens system,
fp is a focal length of the lens having positive refractive power of the 1 st lens group.
The conditional expression (5) is for specifying a preferable range of the focal length of the positive lens of the 1 st lens group G1 with respect to the focal length of the entire system of lenses.
If the refractive power is lower than the lower limit of the conditional expression (5), the positive refractive power of the positive lens of the 1 st lens group G1 is too strong, and astigmatism and axial chromatic aberration cannot be corrected satisfactorily, which is undesirable.
If the upper limit of conditional expression (5) is exceeded, the positive refractive power of the positive lens in the first lens group G1 is too weak, and the ability to correct chromatic aberration of magnification and coma aberration is weakened, so that chromatic aberration of magnification and coma aberration cannot be corrected satisfactorily, which is undesirable.
The lower limit of the conditional expression (5) is preferably 2.2 or more, and more preferably 2.4 or more. The upper limit of the conditional expression (5) is preferably 11.4 or less, and more preferably 10.8 or less.
(embodiment 6)
Embodiment 6 of the present invention is an imaging lens that satisfies conditional expression (6) below.
0.39≤f2a/f≤1.47······(6)
Wherein f is the focal length of the whole lens system,
f2a is the focal length of the 2a lens group.
The conditional expression (6) is for specifying a preferable range of the focal length of the 2 a-th lens group G2a with respect to the focal length of the entire lens system.
If the refractive power is lower than the lower limit of conditional expression (6), the positive refractive power of the 2a lens group is too strong, and the amount of generation of spherical aberration and axial chromatic aberration in the 2a lens group increases, so that it is difficult to correct spherical aberration and axial chromatic aberration well, which is undesirable.
If the upper limit of the conditional expression (6) is exceeded, the positive refractive power of the 2a lens group is too weak, and the strong positive refractive power of the 2 nd lens group G2 is largely borne by the 2b lens group G2b, so that it is difficult to correct astigmatism, chromatic aberration of magnification, and coma aberration satisfactorily, which is undesirable.
The lower limit of the conditional expression (6) is preferably 0.45 or more, more preferably 0.50 or more, more preferably 0.55 or more, more preferably 0.60 or more, more preferably 0.65 or more, and more preferably 0.70 or more. The upper limit of the conditional expression (6) is preferably 1.35 or less, more preferably 1.27 or less, more preferably 1.20 or less, and more preferably 1.10 or less.
(7 th embodiment)
A 7 th embodiment of the present invention is an imaging lens, wherein the 2b3 th lens has a meniscus shape with a convex surface facing the object side, and satisfies the following conditional expression (7).
-0.50≤f/f2b3≤0.67·····(7)
Wherein f is the focal length of the whole lens system,
f2b3 is the focal length of the 2b3 lens.
The 2b3 lens has a meniscus shape with the convex surface facing the object side, and thus can suppress the occurrence of spherical aberration, coma aberration, and axial chromatic aberration, and can correct aberrations satisfactorily.
The conditional expression (7) is for specifying a preferable range of the focal length of the entire lens system with respect to the focal length of the 2b3 th lens.
If the refractive power is lower than the lower limit of the conditional expression (7), the negative refractive power of the 2b3 lens is too strong, and the negative refractive power of the 2b1 lens cannot be enhanced, so that the axial chromatic aberration, coma aberration, and astigmatism cannot be corrected satisfactorily, which is undesirable.
If the positive refractive power of the 2b3 lens exceeds the upper limit of the conditional expression (7), the positive refractive power is too strong, and much astigmatism and chromatic aberration of magnification occur in the 2b3 lens, and thus the astigmatism and chromatic aberration of magnification cannot be corrected satisfactorily, which is undesirable.
The lower limit of the conditional expression (7) is preferably-0.40 or more, more preferably-0.33 or more, and still more preferably-0.25 or more. The upper limit of the conditional expression (7) is preferably 0.60 or less, more preferably 0.50 or less, and still more preferably 0.40 or less.
(embodiment 8)
An 8 th embodiment of the present invention is an imaging lens system, wherein the 2 nd lens group is composed of two lenses having positive refractive power.
By configuring the 2a lens group G2a with two positive lenses, the burden of positive refractive power of the 2a lens group G2a can be shared by the two lenses, and spherical aberration, coma aberration, and chromatic aberration on the axis can be corrected well, so that FNo can be brightened, and high resolution can be achieved. Further, the 2a lens group G2a is formed of two lenses, whereby the total lens length can be shortened.
(embodiment 9)
A 9 th embodiment of the present invention is an imaging lens, wherein the 2b1 th lens has a meniscus shape with a concave surface facing an object side.
By forming the object-side surface of the 2b 1-th lens L2b1 to be a concave surface, axial chromatic aberration, coma aberration, astigmatism, and chromatic aberration of magnification can be corrected well. By forming the image-side surface of the 2b1 th lens L2b1 to be a convex surface, it is not necessary to excessively increase the negative refractive power of the 2b1 th lens L2b1, and as a result, the positive refractive power of the 2b2 th lens L2b2 is also difficult to increase, and chromatic aberration of magnification and astigmatism can be corrected well. Therefore, the 2b1 th lens L2b1 is preferably a meniscus lens with a concave surface facing the object side.
(embodiment 10)
A 10 th embodiment of the present invention is an imaging lens that satisfies conditional expression (8) below.
νd_n≥45.0··········(8)
Wherein vd _ n is an abbe number for d-line of the lens having negative refractive power of the 1 st lens group.
The conditional expression (8) is a condition for defining a preferable range of the abbe number of the lens having negative refractive power in the 1 st lens group G1 for d-line, and for correcting the chromatic aberration of magnification well.
If the lower limit of conditional expression (8) is exceeded, the amount of chromatic aberration of magnification in the negative lens of the 1 st lens group G1 increases, making it difficult to correct the chromatic aberration of magnification satisfactorily, which is undesirable.
The lower limit of the conditional expression (8) is preferably 48.0 or more, more preferably 50.0 or more, and still more preferably 53.0 or more. It is to be noted that the upper limit value of the conditional expression (8) is not necessarily set because the larger the value is, the better the magnification chromatic aberration correction can be performed, but may be 105 or less or 100 or less when the upper limit value is set.
(embodiment 11)
An 11 th embodiment of the present invention is an imaging lens including an aperture stop, and satisfying the following conditional expression (9).
1.6≤L/f≤3.0·······(9)
Wherein f is the focal length of the whole lens system,
l is the distance on the optical axis from the aperture stop to the image plane (back focal length is air-equivalent length).
The conditional expression (9) is used to specify a preferable range of the distance on the optical axis from the aperture stop to the image plane with respect to the focal length of the entire lens system.
If the amount is less than the lower limit of conditional expression (9), it is difficult to suppress the increase of CRA, and therefore, it is not preferable.
When the upper limit of the conditional expression (9) is exceeded, the total lens length tends to be long, which is undesirable.
The lower limit of the conditional expression (9) is preferably 1.7 or more, more preferably 1.8 or more, and still more preferably 1.9 or more. The upper limit of the conditional expression (9) is preferably 2.8 or less, more preferably 2.6 or less, and still more preferably 2.4 or less.
(embodiment 12)
A 12 th embodiment of the present invention is an imaging lens that is characterized in that all lenses are formed of a plastic material.
In the case of a plastic lens, it is advantageous in that the plastic lens can be processed with high precision even in a range other than the optically effective diameter, and the plurality of lenses can be directly fitted with diameters to provide coaxiality, so that deterioration in resolution performance due to decentering at the time of assembly can be prevented. In addition, when all of the plastic lenses are used, the plastic lenses can be manufactured at low cost, which is also preferable.
(embodiment 13)
A 13 th embodiment of the present invention is an imaging lens that satisfies the following conditional expression (10).
1.0≤TTL/(2×Y’max)≤1.7··(10)
Wherein TTL is a distance on the optical axis from the object side surface of the lens disposed closest to the object side to the image plane (back focal length is air equivalent length),
y' max is the maximum image height.
The conditional expression (10) is a conditional expression for defining a preferable range of the length of the total lens length 2 times as large as the maximum image (corresponding to the sensor diagonal length) and for satisfying both the reduction in size and the suppression of the increase in CRA.
If the amount is less than the lower limit of conditional expression (10), it is difficult to suppress the increase of CRA, and therefore, it is not preferable. On the other hand, if the upper limit of the conditional expression (10) is exceeded, the total lens length becomes longer, which is not preferable.
The lower limit of the conditional expression (10) is preferably 1.1 or more, and more preferably 1.2 or more. The upper limit of the conditional expression (10) is preferably 1.6 or less, more preferably 1.5 or less, and still more preferably 1.4 or less.
(embodiment 14)
A 14 th embodiment of the present invention is an imaging apparatus including: the camera lens; and an imaging element disposed at an imaging position of the imaging lens.
The imaging device according to the present invention is preferably configured by combining the imaging lens, which is small and has a wide angle of view, but has a bright FNo, a high resolution, and a small CRA, with an imaging element disposed on an image plane of the imaging lens.
(examples)
Next, embodiments 1 to 7 of the imaging lens of the present invention will be described based on the drawings.
In the optical specification table of the embodiment of the imaging lens, S is a surface number indicating the order of surfaces from the object side to the image surface side. R represents a radius of curvature (mm) of each lens surface, D represents a lens thickness and an air gap (mm), and Nd and vd represent a refractive index and an abbe number at a wavelength of D-line (λ 587.6 nm). The sign of the curvature radius is positive when the convex surface is directed to the object side.
The surface with the symbol on the front surface of the surface number is an aspherical surface. When x (h) represents the amount of displacement in the optical axis direction at H, H representing the coordinate perpendicular to the optical axis with the surface vertex as the origin, a paraxial radius of curvature of R, a conic coefficient of ∈, an aspherical coefficient of order 2 of a, an aspherical coefficient of order 4 of a B, an aspherical coefficient of order 6 of a C, an aspherical coefficient of order 8 of a D, and an aspherical coefficient of order 10 of a E, the aspherical shape is expressed by the following expression 1.
[ number 1]
A lens including an aspherical surface is assumed to have a sign in which a surface shape and a refractive power are considered in a paraxial region.
The aspheric shape has an extremum where x (H) changes from increasing to decreasing or from decreasing to increasing when H represents the coordinate in the direction perpendicular to the optical axis and x (H) represents the displacement in the optical axis direction at H.
In addition, as various data of the embodiment of the imaging lens, focal length f (mm), FNo, maximum angle of view 2 ω (°), maximum image height Y' max (mm), total lens length ttl (mm), distance l (mm) from the aperture stop to the image plane, and CRA (°) at the time of maximum image height are shown, respectively. Further, these values are values on the d-line. The total lens length TTL and the distance L from the aperture stop to the image plane are set to be air-equivalent lengths.
(example 1)
Fig. 1 is a lens cross-sectional view showing a configuration of an imaging lens according to example 1 of the present invention. The imaging lens of embodiment 1 has a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power, which are arranged in this order from the object side. An aperture STOP is disposed between the 1 st lens group G1 and the 2 nd lens group G2. Between the 2 nd lens group G2 and the image plane IMG, there are disposed a cover glass CG and a filter F.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 n-th lens L1n having negative refractive power and a1 p-th lens L1p having positive refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by disposing, in order from the object side, a 2a1 th lens L2a1 having positive refractive power and a 2a2 th lens L2a2 having positive refractive power.
The 2b lens group G2b is configured by disposing a 2b1 lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b2 lens L2b2 having positive refractive power, and a 2b3 lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all lenses are formed of plastic material and are aspheric in shape on both sides.
Fig. 2 shows a longitudinal aberration diagram in wireless telephoto focusing of the imaging lens according to embodiment 1. In the longitudinal aberration diagram shown in fig. 2, spherical aberration (mm), astigmatism (mm), and distortion aberration (%) are shown in this order from the left toward the drawing. In the graph indicating spherical aberration, g, F, d, and C indicate spherical aberration at the wavelength of a g line (λ 435.8nm), an F line (λ 486.1nm), a d line (λ 587.6nm), and a C line (λ 656.3nm), respectively. In the graph showing astigmatism, S denotes a sagittal direction, and T denotes a tangential direction. Further, the characteristics of the d-line are shown in the astigmatism diagram and the distortion aberration diagram. The same applies to the items related to these longitudinal aberration diagrams in other embodiments.
Table 1 shows the optical specification table of example 1.
[ Table 1]
(Table 1)
Surface data
The aspherical surface data of example 1 is shown in table 2.
[ Table 2]
(Table 2)
Various data of example 1 are shown in table 3.
[ Table 3]
(Table 3)
The group focal lengths of the respective lens groups of example 1 are shown in table 4.
[ Table 4]
(Table 4)
The focal length of each lens of example 1 is shown in table 5.
[ Table 5]
(Table 5)
(example 2)
Fig. 3 is a lens cross-sectional view showing the configuration of an imaging lens according to embodiment 2 of the present invention. The image pickup lens of embodiment 2 is configured by arranging, in order from the object side, a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power. An aperture STOP is disposed between the 1 st lens group G1 and the 2 nd lens group G2. Between the 2 nd lens group G2 and the image surface IMG, there are disposed a cover glass CG and a filter F.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 st p lens L1p having positive refractive power and a1 st n lens L1n having negative refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by disposing, in order from the object side, a 2a1 th lens L2a1 having positive refractive power and a 2a2 th lens L2a2 having positive refractive power.
The 2b lens group G2b is configured by disposing a 2b1 lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b2 lens L2b2 having positive refractive power, and a 2b3 lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all the lenses are formed of a plastic material, and both surfaces thereof have aspherical shapes.
Table 6 shows the optical specification table of example 2.
[ Table 6]
(Table 6)
Surface data
Table 7 shows aspherical surface data of example 2.
[ Table 7]
(Table 7)
Various data of example 2 are shown in table 8.
[ Table 8]
(watch 8)
The group focal lengths of the respective lens groups of example 2 are shown in table 9.
[ Table 9]
(watch 9)
The focal lengths of the lenses of example 2 are shown in table 10.
[ Table 10]
(watch 10)
(example 3)
Fig. 5 is a lens cross-sectional view showing the structure of an imaging lens according to embodiment 3 of the present invention. The imaging lens of example 3 is configured by arranging, in order from the object side, a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power. An aperture STOP is disposed between the 1 st lens group G1 and the 2 nd lens group G2. Between the 2 nd lens group G2 and the image plane IMG, a cover glass CG and a filter F are disposed.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 n-th lens L1n having negative refractive power and a1 p-th lens L1p having positive refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by disposing, in order from the object side, a 2a1 th lens L2a1 having positive refractive power and a 2a2 th lens L2a2 having positive refractive power.
The 2b lens group G2b is configured by disposing a 2b1 lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b2 lens L2b2 having positive refractive power, and a 2b3 lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all the lenses are formed of a plastic material, and both surfaces thereof have aspherical shapes.
Table 11 shows the optical specification table of example 3.
[ Table 11]
(watch 11)
The aspherical surface data of example 3 is shown in table 12.
[ Table 12]
(watch 12)
Various data of example 3 are shown in table 13.
[ Table 13]
(watch 13)
The group focal lengths of the respective lens groups of example 3 are shown in table 14.
[ Table 14]
(watch 14)
The focal length of each lens of example 3 is shown in table 15.
[ Table 15]
(watch 15)
(example 4)
Fig. 7 is a lens cross-sectional view showing a structure of an imaging lens according to embodiment 4 of the present invention. The imaging lens of example 4 is configured by arranging, in order from the object side, a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power. An aperture STOP is disposed between the 1 st lens group G1 and the 2 nd lens group G2. Between the 2 nd lens group G2 and the image plane IMG, a cover glass CG and a filter F are disposed.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 n-th lens L1n having negative refractive power and a1 p-th lens L1p having positive refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by arranging, in order from the object side, a 2a1 lens L2a1 having positive refractive power and a 2a2 lens L2a2 having positive refractive power.
The 2 b-th lens group G2b is configured by disposing a 2b 1-th lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b 2-th lens L2b2 having positive refractive power, and a 2b 3-th lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all the lenses are formed of a plastic material, and both surfaces thereof have aspherical shapes.
Table 16 shows the optical specification table of example 4.
[ Table 16]
(watch 16)
Surface data
Table 17 shows aspherical surface data of example 4.
[ Table 17]
(watch 17)
Various data of example 4 are shown in table 18.
[ Table 18]
(watch 18)
The group focal lengths of the lens groups of example 4 are shown in table 19.
[ Table 19]
(watch 19)
The focal lengths of the lenses of example 4 are shown in table 20.
[ Table 20]
(watch 20)
(example 5)
Fig. 9 is a lens cross-sectional view showing a structure of an imaging lens according to embodiment 5 of the present invention. The image pickup lens of embodiment 5 is configured by arranging, in order from the object side, a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power. An aperture STOP is disposed between the 1 st lens group G1 and the 2 nd lens group G2. Between the 2 nd lens group G2 and the image plane IMG, a cover glass CG and a filter F are disposed.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 n-th lens L1n having negative refractive power and a1 p-th lens L1p having positive refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by disposing, in order from the object side, a 2a1 th lens L2a1 having positive refractive power and a 2a2 th lens L2a2 having positive refractive power.
The 2 b-th lens group G2b is configured by disposing a 2b 1-th lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b 2-th lens L2b2 having positive refractive power, and a 2b 3-th lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all lenses are formed of plastic material and are aspheric in shape on both sides.
Table 21 shows an optical specification table of example 5.
[ Table 21]
(watch 21)
Surface data
Table 22 shows aspherical surface data of example 5.
[ Table 22]
(watch 22)
Various data of example 5 are shown in table 23.
[ Table 23]
(watch 23)
The group focal lengths of the respective lens groups of example 5 are shown in table 24.
[ Table 24]
(watch 24)
The focal lengths of the lenses of example 5 are shown in table 25.
[ Table 25]
(watch 25)
(example 6)
Fig. 11 is a lens cross-sectional view showing the configuration of an imaging lens according to embodiment 6 of the present invention. The lens of example 6 is configured by arranging, in order from the object side, a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power. An aperture STOP is disposed between the 1 st lens group G1 and the 2 nd lens group G2. Between the 2 nd lens group G2 and the image plane IMG, a cover glass CG and a filter F are disposed.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 n-th lens L1n having negative refractive power and a1 p-th lens L1p having positive refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by arranging, in order from the object side, a 2a1 lens L2a1 having positive refractive power and a 2a2 lens L2a2 having positive refractive power.
The 2 b-th lens group G2b is configured by disposing a 2b 1-th lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b 2-th lens L2b2 having positive refractive power, and a 2b 3-th lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all the lenses are formed of a plastic material, and both surfaces thereof have aspherical shapes.
Table 26 shows the optical specification table of example 6.
[ Table 26]
(watch 26)
Surface data
Table 27 shows aspherical surface data of example 6.
[ Table 27]
(watch 27)
Various data of example 6 are shown in table 28.
[ Table 28]
(watch 28)
The group focal lengths of the lens groups of example 6 are shown in table 29.
[ Table 29]
(watch 29)
The focal lengths of the lenses of example 6 are shown in table 30.
[ Table 30]
(watch 30)
(example 7)
Fig. 13 is a lens cross-sectional view showing a structure of an imaging lens according to embodiment 7 of the present invention. The image pickup lens of example 7 is configured such that a1 st lens group G1 having negative refractive power and a2 nd lens group G2 having positive refractive power are arranged in this order from the object side. Between the 2 nd lens group G2 and the image plane IMG, a cover glass CG and a filter F are disposed.
The 1 st lens group G1 is configured by arranging, in order from the object side, a1 n-th lens L1n having negative refractive power and a1 p-th lens L1p having positive refractive power. The 2 nd lens group G2 is configured by disposing, in order from the object side, a 2a nd lens group G2a having positive refractive power, and a 2b nd lens group G2 b.
The 2a lens group G2a is configured by arranging, in order from the object side, a 2a1 lens L2a1 having positive refractive power and a 2a2 lens L2a2 having positive refractive power.
An aperture STOP is disposed between the 2a1 th lens L2a1 and the 2a2 th lens L2a 2. The 2 b-th lens group G2b is configured by disposing a 2b 1-th lens L2b1 having negative refractive power and a meniscus shape having a concave surface facing the object side in the vicinity of the optical axis, a 2b 2-th lens L2b2 having positive refractive power, and a 2b 3-th lens L2b 3. The image-side surface of the 2b3 th lens L2b3 has an aspherical shape, has an extreme value at a position other than the intersection of the aspherical surface and the optical axis, and has a shape in which the concave surface faces the image side in the vicinity of the optical axis, but has a shape in which the convex surface faces the image side in the optically effective diameter peripheral portion.
In addition, all the lenses are formed of a plastic material, and both surfaces thereof have aspherical shapes.
Table 31 shows the optical specification table of example 7.
[ Table 31]
(watch 31)
Surface data
Table 32 shows aspherical data of example 7.
[ Table 32]
(watch 32)
Various data of example 7 are shown in table 33.
[ Table 33]
(watch 33)
The group focal lengths of the lens groups of example 7 are shown in table 34.
[ Table 34]
(watch 34)
The focal lengths of the lenses of example 7 are shown in table 35.
[ Table 35]
(watch 35)
Table 36 shows values related to the conditional expressions of the respective embodiments.
[ Table 36]
(watch 36)
(example 8)
As shown in the configuration diagram of fig. 15, the imaging apparatus 100 according to embodiment 8 includes an imaging lens 110 and an imaging device 120 arranged on an image plane of the imaging lens 110. A filter F and a cover glass CG may be disposed between the imaging lens 110 and the imaging element 120.
Claims (12)
1. An image pickup lens comprising a1 st lens group having negative refractive power and a2 nd lens group having positive refractive power, the 1 st lens group comprising a lens having negative refractive power and a lens having positive refractive power, the 2 nd lens group comprising a 2a lens group and a 2b lens group, the 2a lens group having positive refractive power, the 2b lens group comprising a 2b1 th lens, a 2b2 th lens and a 2b3 lens, the 2b1 th lens having negative refractive power and the 2b2 th lens having positive refractive power,
the image-side surface of the 2b3 lens has an aspherical shape having an extremum at a position other than an intersection with the optical axis,
the imaging lens satisfies the following conditional expressions (1), (2) and (3),
0.73≤f2b2/f≤2.40·······(1)
vd_p≤45.0···········(2)
-1.34≤f2b1/f≤-0.46·····(3)
wherein f is the focal length of the whole lens system,
f2b2 is the focal length of the 2b2 lens,
vd _ p is an abbe number for d-line of a lens having positive refractive power of the 1 st lens group,
f2b1 is the focal length of the 2b1 lens,
wherein the 2a lens group is composed of two lenses having positive refractive power.
2. The imaging lens according to claim 1,
an aperture stop is disposed between the 1 st lens group and the 2 nd lens group, or an aperture stop is disposed in the 2 nd lens group.
3. The imaging lens according to claim 1 or 2,
satisfies the following conditional expression (4),
0.38≤f2a/f2b2≤1.57·····(4)
wherein f2a is the focal length of the 2a lens group,
f2b2 is the focal length of the 2b2 lens.
4. The imaging lens according to claim 1 or 2,
satisfies the following conditional expression (5),
1.9≤fp/f≤12.4·······(5)
wherein, the first and the second end of the pipe are connected with each other,
fp is a focal length of a lens having a positive refractive power of the 1 st lens group.
5. The imaging lens according to claim 1 or 2,
satisfies the following conditional expression (6),
0.39≤f2a/f≤1.47······(6)
wherein the content of the first and second substances,
f2a is the focal length of the 2a lens group.
6. The imaging lens according to claim 1 or 2,
the 2b3 th lens has a meniscus shape with a convex surface facing the object side and satisfies the following conditional expression (7),
-0.50≤f/f2b3≤0.67·····(7)
wherein the content of the first and second substances,
f2b3 is the focal length of the 2b3 lens.
7. The imaging lens according to claim 1 or 2,
the 2b1 lens has a meniscus shape with a concave surface facing the object side.
8. The imaging lens according to claim 1 or 2,
satisfies the following conditional expression (8),
vd_n≥45.0···········(8)
wherein vd _ n is an abbe number for d-line of a lens having negative refractive power of the 1 st lens group.
9. The imaging lens according to claim 1 or 2,
the imaging lens has an aperture stop and satisfies the following conditional expression (9),
1.6≤L/f≤3.0·······(9)
wherein L is a distance on the optical axis from the aperture stop to the image plane, and the back focus is an air converted length.
10. The imaging lens according to claim 1 or 2,
all lenses are formed of a plastic material.
11. The imaging lens according to claim 1 or 2,
satisfies the following conditional expression (10),
1.0≤TTL/(2×Y’max)≤1.7··(10)
wherein TTL is a distance on an optical axis from an object side surface of a lens arranged closest to the object side to an image plane, a back focal length is an air equivalent length,
y' max is the maximum image height.
12. An imaging device is characterized by comprising:
an imaging lens according to any one of claims 1 to 11; and an imaging element disposed on an image plane of the imaging lens.
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| JP2018028934A JP7034756B2 (en) | 2018-02-21 | 2018-02-21 | Imaging lens |
| JP2018-028934 | 2018-02-21 |
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| CN107015346A (en) * | 2017-06-06 | 2017-08-04 | 孝感市青谷信息科技有限公司 | A kind of imaging lens module for mobile communication terminal |
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2018
- 2018-02-21 JP JP2018028934A patent/JP7034756B2/en active Active
- 2018-12-14 CN CN201811534312.5A patent/CN110174743B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203606556U (en) * | 2012-11-21 | 2014-05-21 | 康达智株式会社 | Imaging lens |
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| JP7034756B2 (en) | 2022-03-14 |
| JP2019144430A (en) | 2019-08-29 |
| CN110174743A (en) | 2019-08-27 |
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