CN209962000U - Imaging lens and imaging device - Google Patents
Imaging lens and imaging device Download PDFInfo
- Publication number
- CN209962000U CN209962000U CN201921006004.5U CN201921006004U CN209962000U CN 209962000 U CN209962000 U CN 209962000U CN 201921006004 U CN201921006004 U CN 201921006004U CN 209962000 U CN209962000 U CN 209962000U
- Authority
- CN
- China
- Prior art keywords
- lens
- imaging
- lens group
- positive
- imaging lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model provides an imaging lens and imaging device. The imaging lens includes a first lens group having positive power, a second lens group having negative power, a stop, and a third lens group having positive power, which are arranged in order from an object side to an image side; the second lens group moves along the optical axis in the focusing process, and the positions of the first lens group and the third lens group relative to the image surface are fixed; the imaging lens satisfies the conditional expression: 0.4<F1the/F is less than or equal to 1.5, wherein, F represents the focal length of the imaging lens, and F1The composite focal length of the first lens group is indicated. Thereby reducing the weight of the whole system, and providing a small, light, large-aperture imaging lens and imaging lens having excellent imaging performanceAn apparatus. Meanwhile, the focusing component of the imaging lens can only comprise one lens, so that the imaging lens and the imaging device can be quickly focused and the light weight of the imaging lens and the imaging device can be realized.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to an imaging lens and imaging device.
Background
The standard portrait lens generally refers to a lens for photographing a person at a distance of 1.5m to 2m, and according to a general aesthetic point of view, the five sense organs of the person are most beautiful when the person looks outside 1.5m to 2 m. Because the perspective effect of this distance makes the nose of the person appear slightly smaller than the real one without the face being too flat. And people usually only take pictures of the head and shoulders when taking pictures. Therefore, the standard portrait camera lens is generally a camera lens for photographing people at a distance of 1.5-2 m, which can be longer, but is not easy to communicate with the people to be photographed, and is short in distance and deformed. The standard portrait lens generally has a field angle of 20 ° to 35 °, and is widely demanded for portrait photographing by blurring objects outside the field angle and highlighting people and objects within the field angle.
The existing standard portrait lens with large F value generally adopts triple lens structure, and for the standard lens with large aperture and F value smaller than 2, it usually adopts double gauss structure. However, the double-gauss lens is of a symmetrical structure, so that the petzwann value is large, the focusing lens group moves to the whole lens group, so that the electronic focusing speed is too slow and inaccurate, and in addition, the whole size is too large and heavy, so that the double-gauss lens is inconvenient to carry.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides an imaging lens and imaging device, its small in size is light, and only a slice lens can be accomplished to the focusing part, has the characteristics that the speed of focusing is fast, imaging performance is excellent.
Therefore, the purpose of the utility model is realized by the following technical scheme:
an imaging lens comprising, arranged in order from an object side to an image side: a first lens group having positive focal power, a second lens group having negative focal power, a diaphragm, and a third lens group having positive focal power;
the second lens group moves along an optical axis in the focusing process, and the positions of the first lens group and the third lens group relative to an image surface are fixed;
the imaging lens meets the following conditional expression:
0.4<F1/F≤1.5，
wherein F represents the focal length of the imaging lens, F1Representing a combined focal length of the first lens group.
Further, the first lens group includes a cemented lens group composed of a positive lens and a negative lens, the positive lens satisfying the following conditional expression:
70≤νd≤95，
wherein, vdDefined as the abbe number of the medium with respect to light having a wavelength of 587.6 nm.
Further, the first lens group further comprises a first positive lens and a second positive lens, the first positive lens is arranged on the object side of the second positive lens, and the cemented lens group is arranged on the image side of the second positive lens;
the curvature radius of the image side surface of the second positive lens is R2bThe radius of curvature of the object side surface of the cemented lens group is R3aAnd satisfies the following conditional expressions:
1＜R3a/R2b＜13。
further, the second lens group includes at least one negative lens, and the negative lens satisfies the following conditional expression:
1.59≤nd≤1.70，
wherein n isdDefined as the refractive index of the medium with respect to light having a wavelength of 587.6 nm.
Further, the second lens group includes at least one negative lens, and the negative lens satisfies the following conditional expression:
50≤νd≤83，
wherein, vdDefined as the abbe number of the medium with respect to light having a wavelength of 587.6 nm.
Further, the third lens group is provided with a negative meniscus lens, and the negative meniscus lens is curved on the object side and the image sideRadius of curvature is Ra、RbAnd satisfies the following conditional expressions:
1＜(Ra+Rb)/(Ra-Rb)＜15。
further, a composite focal length F of the third lens group3The following conditional expressions are satisfied:
0.5≤F3/F≤1.5。
further, a distance B between a lens surface closest to the image side in the imaging lens and the image planefThe following conditional expressions are satisfied:
0.17<Bf/F<0.29。
further, from the object side to the image side,
the first lens group is sequentially provided with a first positive lens, a second positive lens, a first negative lens and a third positive lens, and the first negative lens and the third positive lens form a cemented lens group;
the second lens group is provided with a second negative lens;
the third lens group is provided with a fourth positive lens, a third negative lens, a fifth positive lens and a fourth negative lens in sequence.
Furthermore, the utility model also provides an imaging device, it includes foretell any kind of imaging lens.
The utility model discloses an imaging lens and imaging device have following beneficial effect at least:
the imaging lens and the imaging apparatus pass the conditional expression 0.4<F1the/F is less than or equal to 1.5 to limit the focal length range of the first lens group, thereby specifying the incident angle and the entrance pupil position of the light rays of the first lens group. Within this conditional expression, the entrance pupil is positioned closer to the object side, and the entrance pupil size is also smaller. With the same angle of view, the intersection of the principal ray and the lens is closer to the optical axis, so the aperture of the first lens group can be designed smaller, and the aberrations such as spherical aberration, distortion, etc. caused by the declination angle of the ray are correspondingly smaller. Thus, the weight of the whole system can be reduced, and an imaging lens and an imaging apparatus which are small, light, large in aperture and excellent in imaging performance can be provided. At the same time, the cost is lowThe focusing component of the imaging lens can only comprise one lens, which is beneficial to realizing the rapid focusing and miniaturization of the imaging lens and the imaging device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view showing a lens structure of an imaging lens according to embodiment 1 of the present invention;
fig. 2A shows a schematic diagram of spherical aberration of an imaging lens provided in embodiment 1 of the present invention when focusing on Infinity (INF);
fig. 2B shows an astigmatism schematic diagram of an imaging lens provided in embodiment 1 of the present invention at infinity focusing (INF);
fig. 2C is a schematic diagram illustrating spherical aberration of the imaging lens provided in embodiment 1 of the present invention when focusing at infinity (0.8 m);
fig. 2D shows an astigmatism schematic diagram of the imaging lens provided in embodiment 1 of the present invention at infinity focus (0.8 m);
fig. 3 is a schematic view showing a lens structure of an imaging lens according to embodiment 2 of the present invention;
fig. 4A shows a schematic diagram of spherical aberration of an imaging lens provided in embodiment 2 of the present invention when focusing on Infinity (INF);
fig. 4B shows an astigmatism schematic diagram of an imaging lens provided in embodiment 2 of the present invention at infinity focusing (INF);
fig. 4C is a schematic diagram illustrating spherical aberration of the imaging lens provided in embodiment 2 of the present invention when focusing at infinity (0.8 m);
fig. 4D shows an astigmatism schematic diagram of the imaging lens provided in embodiment 2 of the present invention at infinity focus (0.8 m);
fig. 5 is a schematic view showing a lens structure of an imaging lens according to embodiment 3 of the present invention;
fig. 6A shows a schematic diagram of spherical aberration of an imaging lens provided in embodiment 3 of the present invention when focusing on Infinity (INF);
fig. 6B shows an astigmatism schematic diagram of an imaging lens provided in embodiment 3 of the present invention at infinity focusing (INF);
fig. 6C is a schematic diagram illustrating spherical aberration of the imaging lens provided in embodiment 3 of the present invention when focusing at infinity (0.8 m);
fig. 6D shows an astigmatism schematic diagram of the imaging lens provided in embodiment 3 of the present invention at infinity focus (0.8 m).
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The present invention will be described in further detail below with reference to the following examples and accompanying drawings:
the utility model discloses an imaging lens includes the first lens group that has positive focal power, the second lens group that has negative focal power, diaphragm and the third lens group that has positive focal power that disposes in order from the thing side to image side. And in the focusing process, the second lens group moves along the optical axis, and the positions of the first lens group and the third lens group relative to the image surface are fixed.
The imaging lens satisfies the following conditional expressions:
0.4<F1/F≤1.5 (1)
wherein F represents the focal length of the imaging lens, F1Representing a combined focal length of the first lens group.
The focal length range of the first lens group is defined in conditional expression (1) so as to specify the incident angle and the entrance pupil position of the light rays of the first lens group, and within the range of conditional expression (1), the entrance pupil position is closer to the object side and the entrance pupil size is smaller. With the same angle of view, the intersection of the principal ray and the lens is closer to the optical axis, so the aperture of the first lens group can be designed smaller, and the aberrations such as spherical aberration, distortion, etc. caused by the declination angle of the ray are correspondingly smaller.
An imaging lens in which the combined focal length of the first lens group is configured according to conditional expression (1), the weight of the entire system can be reduced, and an imaging lens which is small, lightweight, and large in aperture and has excellent imaging performance is provided. The imaging lens can always have an F value of 1.6-2.2 and a field angle of 20-35 degrees, and can be used as a standard portrait lens. Of course, the present imaging lens can be suitably used in a camera having an interchangeable lens, a video camera, a digital camera, a broadcasting camera, and the like. Meanwhile, the focusing component of the imaging lens can only comprise one lens, so that the imaging lens can be quickly focused.
When F is present1if/F exceeds the lower limit of the conditional expression (1), the focal length of the first lens group is too small, the focal power is too large, the lens diameter of the first lens group is increased, and various aberrations such as spherical aberration are difficult to correct by the second and third lens groups, so that the requirements of good imaging quality and portability are not met. If F1if/F exceeds the upper limit of the conditional expression (1), the total length of the optical system of the imaging lens becomes excessively long, resulting in an increase in the size of the imaging lens.
When the conditional expression (1) satisfies the range shown below,
0.8<F1/F≤1.2 (1a)
by satisfying the range defined by the conditional expression (1a), further improvement in imaging performance is achieved.
Further, the first lens group includes a cemented lens group composed of a positive lens and a negative lens, the positive lens satisfying the following conditional expression:
70≤νd≤95 (2)
wherein, vdDefined as the abbe number of the medium with respect to light having a wavelength of 587.6 nm.
Conditional expression (2) specifies the dispersion coefficient of the positive lens of the cemented lens group in the first lens group, determines the degree of correction of the positional chromatic aberration and chromatic aberration of magnification of the first lens group, and is an important factor affecting the imaging performance.
If the abbe number of the positive lens of the cemented lens group exceeds the lower limit of the conditional expression (2), the cemented lens group has weak capability of correcting two chromatic aberrations, which is not favorable for correcting the chromatic aberration of the whole imaging lens. If the abbe number of the positive lens of the cemented lens group exceeds the upper limit of the conditional expression (2), the cost of the lens becomes excessively high (the lens having an abbe number exceeding 95 is extremely expensive), and the performance becomes excessive. In summary, limiting the abbe number of the positive lens within a certain range can reduce the cost of the imaging lens and improve the performance of the imaging lens.
When the conditional expression (2) satisfies the following range,
80≤νd≤90 (2a)
by satisfying the range defined by the conditional expression (2a), further optimization of the imaging performance and cost is achieved.
In addition, the first lens group further comprises a first positive lens and a second positive lens, the first positive lens is arranged on the object side of the second positive lens, and the cemented lens group is arranged on the image side of the second positive lens. The curvature radius of the image side surface of the second positive lens is R2bThe radius of curvature of the object-side surface of the cemented lens group is R3aAnd satisfies the following conditional expressions:
1＜R3a/R2b＜13 (3)
conditional expression (3) specifies the power distribution ratio in the first lens group, and the imaging lens can maintain good imaging performance by satisfying conditional expression (3).
If R is3a/R2bIf the lower limit of the conditional expression (3) is exceeded, the radius of curvature of the lens on the object-side surface of the cemented lens group becomes too small, and as a result, the negative spherical aberration is reduced, but the length of the cemented lens increasesThe interval between the two lens groups and the diaphragm is equivalent to the extension of the total length of the imaging lens, so that the interval is not preferable. If R is3a/R2bIf the upper limit of the conditional expression (3) is exceeded, the focal power of the lens on the object-side surface of the cemented lens group is too small, and the generated spherical aberration becomes too large, which is not preferable because the correction of the spherical aberration of the entire imaging lens group is not facilitated.
When the conditional expression (3) satisfies the range shown below,
5＜R3a/R2b＜9 (3a)
by satisfying the range defined by the conditional expression (3a), further improvement in imaging performance is achieved.
In addition, the second lens group comprises at least one negative lens, and the negative lens satisfies the following conditional expression:
1.59≤nd≤1.70 (4)
50≤νd≤83 (5)
wherein n isd、νdRespectively defined as the refractive index and abbe number of the medium with respect to light having a wavelength of 587.6 nm.
The refractive index and abbe number of the negative lens are defined by conditional expressions (4) and (5), and the positional chromatic aberration and chromatic aberration of magnification after the second lens group are determined by the values defined by the conditional expressions, which are important factors affecting the imaging performance.
If the refractive index exceeds the lower limit of the conditional expression (4) and the abbe number exceeds the upper limit of the conditional expression (5), the correction of the positional chromatic aberration and the spherical aberration generated in the first lens group becomes insufficient, which is not preferable, and the imaging performance is deteriorated. If the refractive index exceeds the upper limit of the conditional expression (4) and the abbe number exceeds the lower limit of the conditional expression (5), the correction of the positional chromatic aberration and the spherical aberration generated in the first lens group becomes excessive, which is not preferable because the imaging performance deteriorates.
When the conditional expressions (4) and (5) satisfy the ranges shown below,
1.63≤nd≤1.68 (4a)
60≤νd≤70 (5a)
further improvement in image forming performance is achieved by satisfying the ranges defined by the conditional expressions (4a) and (5 a).
As described above, the second lens group may include only one negative lens, and the fast focusing is realized by the movement of the negative lens along the optical axis.
In addition, the third lens group is provided with a negative meniscus lens having radii of curvature R on the object side and the image side, respectivelya、RbAnd satisfies the following conditional expressions:
1＜(Ra+Rb)/(Ra-Rb)＜15 (6)
conditional expression (6) specifies the correction ratio of the spherical aberration of the negative meniscus lens in the third lens group. The imaging lens can maintain good imaging performance by satisfying the conditional expression (6).
If the correction ratio of the spherical aberration of the negative meniscus lens exceeds the lower limit of the conditional expression (6), the power of the negative meniscus lens becomes too small, and as a result, the total optical length of the imaging lens becomes longer, which is not preferable. If the correction ratio of the spherical aberration of the negative meniscus lens exceeds the upper limit of the conditional expression (6), the curvature of the image side surface of the negative meniscus lens becomes excessively large, and the positive spherical field curvature becomes excessively large, which is not preferable, and the performance of the imaging lens is deteriorated.
When the conditional expression (6) satisfies the range shown below,
5＜(Ra+Rb)/(Ra-Rb)＜10 (6a)
by satisfying the range defined by the conditional expression (6a), further improvement in imaging performance is achieved.
Further, a composite focal length F of the third lens group3The following conditional expressions are satisfied:
0.5≤F3/F≤1.5 (7)
conditional expression (7) specifies the light incidence angle of the positive lens in the third lens group. The imaging lens can maintain good imaging performance by satisfying the conditional expression (7).
If F3if/F exceeds the lower limit of conditional expression (7), the combined power of the third lens group becomes too large, resulting in too large spherical aberration, and excessive spherical aberration correction, which is not preferable.If F3if/F exceeds the upper limit of conditional expression (7), the combined power of the third lens group becomes too small, resulting in too small positive spherical aberration, and hence insufficient spherical aberration correction, which is not preferable.
When the conditional expression (7) satisfies the following range,
0.8≤F3/F≤1.2 (7a)
by satisfying the range defined by the conditional expression (7a), further improvement in imaging performance is achieved.
Further, a distance B between a lens surface closest to the image side in the imaging lens and the image planefThe following conditional expressions are satisfied:
0.17<Bf/F<0.29 (8)
the conditional expression (8) is for realizing high optical performance of the imaging lens while ensuring a camera that can be used for an interchangeable lens such as a micro single camera. Such as configuring the imaging lens as a micro single lens of 85 mmF1.8.
If B isfif/F exceeds the lower limit of the conditional expression (8), the back intercept becomes too short with respect to the focal length of the optical system to be suitable for a micro-single-camera optical system, and is therefore not preferable. If B isfif/F exceeds the upper limit of conditional expression (8), the back intercept becomes relatively too long with respect to the focal length of the optical system, the refractive power distribution becomes further away from the symmetrical type, and therefore it is difficult to correct distortion and high optical performance cannot be achieved, and therefore it is not preferable.
When the conditional expression (8) satisfies the following range,
0.21<Bf/F<0.25 (8a)
by satisfying the range defined by the conditional expression (8a), further improvement in imaging performance is achieved.
The utility model also provides an imaging device, including foretell imaging lens.
To sum up, the utility model provides an imaging lens and imaging device has smallly, and light in weight, focusing member only has the characteristic of a slice lens, can make the outstanding optical lens of focusing rapidly, portable, formation of image.
Hereinafter, the imaging lens of the present invention will be described in detail with reference to the drawings, in which the refractive index and the focal length are values of d-line (wavelength 587.6nm) in the lens data. In the imaging lens-related data, the unit of the length is mm, and the unit thereof will be omitted.
It is noted that the symbols used in the table and the following description are as follows:
"i" represents a surface number; ' ri"is the radius of curvature; ' di"is the on-axis surface distance between the ith surface and the (i + 1) th surface; "n" isd"is the refractive index; v isi"is Abbe number; "Fno."is the F number; "ω" is the half field angle. With respect to the surface number, "ASP" indicates that the surface is an aspherical surface, and with respect to the radius of curvature, "∞" indicates that the surface is a plane. Further, with respect to the on-axis surface distance, the variable distances in each table are indicated in the order of "infinity focus (INF)" and "closest distance focus (0.8 m)".
Further, the refractive index and Abbe number are those with respect to the d-line (wavelength 587.6 nm).
Example 1
Fig. 1 shows a cross-sectional view along the optical axis of the structure of the imaging lens of the present embodiment.
The imaging lens is configured by arranging the following lens groups in order from the object side to the imaging side as shown in the figure: a first lens group GR1 having positive optical power, a second lens group GR2 having negative optical power, a stop, and a third lens group GR3 having positive optical power. The second lens group moves along the optical axis during focusing, and the first lens group and the third lens group are fixed relative to the image plane.
Further, the first lens group includes, in order from the object side to the image side, a positive lens L11, a positive lens L12, a negative lens L13, and a positive lens L14, wherein the negative lens L13 and the positive lens L14 constitute a cemented lens group; the second lens group is a negative lens L21; the third lens group is configured of a positive lens L31, a negative lens L32, a positive lens L33, and a negative lens L34 in this order. The negative lens L34 is a meniscus negative lens.
A parallel glass plate GL configured by a filter is disposed between the negative lens L34 of the third lens group GR3 and the image surface IMG. The back intercept is the distance from the image-side surface of L34 to the image surface IMG, where the parallel glass plate GL can be transformed into air.
Hereinafter, various numerical data regarding the imaging lens of the present embodiment in which the surface S is showniThe imaging lens is arranged on the surface of the lens from the object plane to the image plane in sequence.
Fig. 2A to 2B are aberration diagrams illustrating an imaging lens according to the present embodiment at infinity focus (INF), and fig. 2C to 2D are aberration diagrams illustrating an imaging lens according to the present embodiment at closest distance focus (0.8 m).
The F line, d line and C line represent spherical aberration at the F line (wavelength 486nm), d line (wavelength 588nm) and C line (wavelength 656 nm). In addition, in the diagram illustrating astigmatism, a solid line S represents a value of a principal ray d on a sagittal image surface, and a solid line T represents a value of the principal ray d on a meridional image surface. The above description of the various aberration profiles is the same as the other embodiments and will not be repeated hereinafter.
As can be seen from the illustration, the imaging lens of the present embodiment has an excellent imaging effect.
Example 2
Fig. 3 shows a cross-sectional view along the optical axis of the structure of the imaging lens of the present embodiment.
The present embodiment is different from embodiment 1 in the lens parameters of the imaging lens. Hereinafter, various numerical data regarding the imaging lens of the present embodiment are shown.
Fig. 4A to 4B are diagrams illustrating aberrations of the imaging lens according to the present embodiment at infinity focus (INF), and fig. 4C to 4D are diagrams illustrating aberrations of the imaging lens according to the present embodiment at closest distance focus (0.8 m).
As can be seen from the illustration, the imaging lens of the present embodiment has an excellent imaging effect.
Example 3
Fig. 5 shows a cross-sectional view along the optical axis of the structure of the imaging lens of the present embodiment.
The present embodiment is different from embodiment 1 in the lens parameters of the imaging lens. Hereinafter, various numerical data regarding the imaging lens of the present embodiment in which the surface S is showniThe imaging lens has a surface of lenses arranged in order from an object plane to an image plane.
Fig. 6A to 6B are diagrams illustrating aberrations of the imaging lens according to the present embodiment at infinity focus (INF), and fig. 6C to 6D are diagrams illustrating aberrations at closest distance focus (0.8 m).
As can be seen from the illustration, the imaging lens of the present embodiment has an excellent imaging effect.
The following table shows a list of calculated values of conditional expressions 1 to 8 in each example.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. An imaging lens comprising, arranged in order from an object side to an image side: a first lens group having positive focal power, a second lens group having negative focal power, a diaphragm, and a third lens group having positive focal power;
the second lens group moves along an optical axis in the focusing process, and the positions of the first lens group and the third lens group relative to an image surface are fixed;
the imaging lens meets the following conditional expression:
0.4<F1/F≤1.5，
wherein F represents the focal length of the imaging lens, F1Representing a combined focal length of the first lens group.
2. The imaging lens according to claim 1, wherein the first lens group comprises a cemented lens group composed of a positive lens and a negative lens, the positive lens satisfying the following conditional expression:
70≤νd≤95，
wherein, vdDefined as the abbe number of the medium with respect to light having a wavelength of 587.6 nm.
3. The imaging lens according to claim 2, wherein the first lens group further includes a first positive lens and a second positive lens, the first positive lens is provided on an object side of the second positive lens, and the cemented lens group is provided on an image side of the second positive lens;
the curvature radius of the image side surface of the second positive lens is R2bThe radius of curvature of the object side surface of the cemented lens group is R3aAnd satisfies the following conditional expressions:
1＜R3a/R2b＜13。
4. an imaging lens according to claim 1, wherein the second lens group includes at least one negative lens that satisfies the following conditional expression:
1.59≤nd≤1.70，
wherein n isdDefined as the refractive index of the medium with respect to light having a wavelength of 587.6 nm.
5. An imaging lens according to claim 1, wherein the second lens group includes at least one negative lens that satisfies the following conditional expression:
50≤νd≤83，
wherein, vdDefined as the abbe number of the medium with respect to light having a wavelength of 587.6 nm.
6. The imaging lens assembly according to claim 1, wherein the third lens group is provided with a negative meniscus lens having R radii of curvature on the object side and the image side, respectivelya、RbAnd satisfies the following conditional expressions:
1＜(Ra+Rb)/(Ra-Rb)＜15。
7. the imaging lens according to claim 1, characterized in that a composite focal length F of the third lens group3The following conditional expressions are satisfied:
0.5≤F3/F≤1.5。
8. the imaging lens according to claim 1, wherein a distance B between a lens surface closest to the image side in the imaging lens and an image planefThe following conditional expressions are satisfied:
0.17<Bf/F<0.29。
9. the imaging lens of claim 1, wherein the image side of the object is located in a direction from the object side to the image side,
the first lens group is sequentially provided with a first positive lens, a second positive lens, a first negative lens and a third positive lens, and the first negative lens and the third positive lens form a cemented lens group;
the second lens group is provided with a second negative lens;
the third lens group is provided with a fourth positive lens, a third negative lens, a fifth positive lens and a fourth negative lens in sequence.
10. An imaging apparatus characterized by comprising the imaging lens according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921006004.5U CN209962000U (en) | 2019-06-27 | 2019-06-27 | Imaging lens and imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921006004.5U CN209962000U (en) | 2019-06-27 | 2019-06-27 | Imaging lens and imaging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209962000U true CN209962000U (en) | 2020-01-17 |
Family
ID=69248245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921006004.5U Expired - Fee Related CN209962000U (en) | 2019-06-27 | 2019-06-27 | Imaging lens and imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209962000U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146970A (en) * | 2019-06-27 | 2019-08-20 | 深圳市永诺摄影器材股份有限公司 | A kind of imaging lens and imaging device |
| CN113703142A (en) * | 2021-09-26 | 2021-11-26 | 江西凤凰光学科技有限公司 | Long-focus lens with high pixels and large target surface |
| CN114636546A (en) * | 2022-03-10 | 2022-06-17 | 杭州海康威视数字技术股份有限公司 | System for imaging synchronicity detection |
-
2019
- 2019-06-27 CN CN201921006004.5U patent/CN209962000U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146970A (en) * | 2019-06-27 | 2019-08-20 | 深圳市永诺摄影器材股份有限公司 | A kind of imaging lens and imaging device |
| CN110146970B (en) * | 2019-06-27 | 2023-08-18 | 深圳市永诺电器有限公司 | Imaging lens and imaging equipment |
| CN113703142A (en) * | 2021-09-26 | 2021-11-26 | 江西凤凰光学科技有限公司 | Long-focus lens with high pixels and large target surface |
| CN113703142B (en) * | 2021-09-26 | 2024-04-26 | 江西凤凰光学科技有限公司 | High-pixel large-target-surface tele lens |
| CN114636546A (en) * | 2022-03-10 | 2022-06-17 | 杭州海康威视数字技术股份有限公司 | System for imaging synchronicity detection |
| CN114636546B (en) * | 2022-03-10 | 2024-05-14 | 杭州海康威视数字技术股份有限公司 | System for imaging synchronicity detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4111470B2 (en) | Wide angle zoom lens | |
| JP3822268B2 (en) | Zoom lens | |
| JPH1039210A (en) | Zoom lens | |
| JPH0354325B2 (en) | ||
| JPH075361A (en) | Zoom lens | |
| JPS6361641B2 (en) | ||
| JPH05157965A (en) | Wide-angle lens | |
| JPH11153752A (en) | Bright wide-angle lens | |
| CN209962000U (en) | Imaging lens and imaging device | |
| CN110261999B (en) | Optical system and imaging lens | |
| CN110221417B (en) | Wide-angle optical system and optical device | |
| CN213276108U (en) | Imaging lens and imaging device | |
| JPH11223772A (en) | Zoom lens | |
| US8363333B2 (en) | Macro lens system | |
| CN111443470A (en) | Internal focusing type imaging lens | |
| CN110146970B (en) | Imaging lens and imaging equipment | |
| CN116679430B (en) | Zoom lens | |
| CN209961992U (en) | Optical system and imaging lens | |
| JP3085823B2 (en) | Aspherical zoom lens and video camera using it | |
| JP3360779B2 (en) | High zoom lens system | |
| JPH0814654B2 (en) | Small zoom lens | |
| JP2605386B2 (en) | Compact zoom lens | |
| JPH05150160A (en) | Zoom lens | |
| JPH10301021A (en) | Small-sized lens | |
| JPH06308383A (en) | Intermediate telephoto lens for underwater camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200117 |