CN110221414B - Image pickup apparatus and electronic device equipped with the same - Google Patents
Image pickup apparatus and electronic device equipped with the same Download PDFInfo
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- CN110221414B CN110221414B CN201910661567.6A CN201910661567A CN110221414B CN 110221414 B CN110221414 B CN 110221414B CN 201910661567 A CN201910661567 A CN 201910661567A CN 110221414 B CN110221414 B CN 110221414B
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Classifications
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The application discloses an image pickup apparatus and an electronic device equipped with the same, the image pickup apparatus including a first lens group and a second lens group. The first lens group sequentially comprises six lenses with focal power from an object side to an image side along a first optical axis, wherein the first lens group has positive focal power, the object side surface of the first lens group is a convex surface, and the image side surface of the first lens group is a concave surface; the first group of sixth lenses has negative focal power, the object side surface is concave, and the image side surface is concave. The second lens group sequentially comprises four lenses with focal power from the object side to the image side along the second optical axis, wherein the first lens group of the second lens group has positive focal power, and the third lens group of the second lens group has positive focal power. The distance TTLa between the object side surface of the first lens group and the imaging surface of the first lens group on the first optical axis and the distance TTLb between the object side surface of the second lens group and the imaging surface of the second lens group on the second optical axis satisfy the following conditions: TTLa/TTLb is more than 0.8 and less than 1.3.
Description
Technical Field
The present invention relates to the field of optical elements and systems, and more particularly, to an image pickup apparatus including an ultra-thin lens group and a near infrared lens group, and an electronic device equipped with the image pickup apparatus.
Background
With the advancement of technology and the development of economy, people have increasingly demanded imaging functions of electronic devices such as tablet computers, cameras, smart phones, unmanned aerial vehicles, and the like. The conventional image pickup device with a single lens group cannot meet the shooting requirements of various application scenes, especially the scenes with insufficient light such as at night. Configuring multiple lens groups to accommodate shooting requirements for more application scenes is currently a common solution.
On the other hand, with the trend of miniaturization of portable electronic devices, there is an increasing demand for miniaturization of imaging devices used in combination, and therefore, a plurality of lens groups are required to satisfy the shooting demands of each application scene while ensuring miniaturization.
Disclosure of Invention
The present application provides an image pickup apparatus and an electronic device applicable to a portable electronic product, which can solve at least or partially at least one of the above-mentioned drawbacks in the related art.
An aspect of the present application discloses an image pickup apparatus including a first lens group and a second lens group. The first lens group sequentially comprises a first group of first lenses, a first group of second lenses, a first group of third lenses, a first group of fourth lenses, a first group of fifth lenses and a first group of sixth lenses, which have optical power, along a first optical axis from an object side to an image side, wherein the first group of first lenses can have positive optical power, the object side of the first lens group can be a convex surface, and the image side of the first lens group can be a concave surface; the first group of sixth lenses may have negative optical power, the object-side surface thereof may be concave, and the image-side surface thereof may be concave. The second lens group sequentially comprises a second group first lens, a second group second lens, a second group third lens and a second group fourth lens with focal power from the object side to the image side along a second optical axis, and an infrared band-pass filter arranged between the second group fourth lens and an imaging surface of the second lens group, wherein the second group first lens can have positive focal power; the second group of third lenses may have positive optical power.
In one embodiment, a distance TTLa between an object side surface of the first lens group and an imaging surface of the first lens group on the first optical axis and a distance TTLb between an object side surface of the second lens group and an imaging surface of the second lens group on the second optical axis may satisfy: TTLa/TTLb is more than 0.8 and less than 1.3.
In one embodiment, the maximum half field angle Semi-FOVa of the first lens group and the maximum half field angle Semi-FOVb of the second lens group may satisfy: semi-FOVa/Semi-FOVb < 0.8 < 1.
In one embodiment, a distance TTLa between the object side surface of the first lens group and the imaging surface of the first lens group on the first optical axis and a half of a diagonal length of the effective pixel area on the imaging surface of the first lens group imghha may satisfy: TTLa/ImgHa < 1.8.
In one embodiment, a distance TTLb between the object side surface of the first lens element of the second lens group and the imaging surface of the second lens group on the second optical axis and a half of a diagonal length of the effective pixel area on the imaging surface of the second lens group ImgHb may satisfy: TLb/ImgHb.ltoreq.2.
In one embodiment, the total effective focal length fb of the second lens group and the entrance pupil diameter EPDb of the second lens group may satisfy: 1 < fb/EPDB < 1.5.
In one embodiment, the effective focal length f2a of the second lens of the first group and the effective focal length f5a of the fifth lens of the first group may satisfy: -3 < f2a/f5a < -2.
In one embodiment, the distance TDb between the object side surface of the second group of first lenses and the image side surface of the second group of fourth lenses on the second optical axis and the distance BFLb between the image side surface of the second group of fourth lenses and the image plane of the second lens group on the second optical axis may satisfy: 1.5 < TDb/BFLb < 2.
In one embodiment, the radius of curvature R1a of the object side surface of the first lens group and the radius of curvature R4a of the image side surface of the second lens group may satisfy: r1a/R4a is more than 0.3 and less than 1.
In one embodiment, the effective radius DT62a of the image side surface of the first group sixth lens and half the diagonal length imghha of the effective pixel region on the imaging surface of the first lens group may satisfy: DT62a/ImgHa is 0.7 < 1.
In one embodiment, the effective radius DT42b of the image side surface of the second group fourth lens and half the diagonal length of the effective pixel area on the imaging surface of the second lens group ImgHb may satisfy: DT42b/ImgHb > 0.9.
In one embodiment, a distance SAG41b between an intersection point of the center thickness CT4b of the second group fourth lens and the object side surface of the second group fourth lens and the second optical axis and an effective radius vertex of the object side surface of the second group fourth lens on the second optical axis may satisfy: 0.6 < CT4b/SAG41b < 1.
In one embodiment, the band pass band of the infrared band pass filter may be 860nm to 960nm.
In one embodiment, any two adjacent lenses in the first lens group may have an air space on the first optical axis.
In one embodiment, any two adjacent lenses in the second lens group may have an air space on the second optical axis.
In one embodiment, all lenses of the first lens group may be made of plastic material.
In one embodiment, all lenses of the second lens group may be made of plastic material.
Another aspect of the present application also provides an electronic apparatus including the image pickup device as described above, wherein the first lens group and the second lens group are disposed on the same side of the electronic apparatus, and the first lens group and the second lens group are arranged in a horizontal direction or a vertical direction on the same side of the electronic apparatus.
The imaging device provided by the embodiment of the application adopts the first lens group (ultrathin lens group) and the second lens group (near infrared lens group) to be matched with each other for use, and at least one beneficial effect of miniaturization, clear imaging under different illumination environments and the like is achieved by reasonably setting the surface type and focal power of each lens in the first lens group and the second lens group, the center thickness of the lens and the interval distance between the lenses.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic diagram illustrating an electronic device according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating an electronic device according to another embodiment of the present application;
fig. 3 shows a schematic structural view of a first lens group according to embodiment 1 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the first lens group of embodiment 1;
fig. 5 shows a schematic structural view of a first lens group according to embodiment 2 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the first lens group of embodiment 2;
fig. 7 shows a schematic structural view of a first lens group according to embodiment 3 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the first lens group of embodiment 3;
fig. 9 shows a schematic structural view of a second lens group according to embodiment 4 of the present application;
Fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the second lens group of embodiment 4;
fig. 11 shows a schematic structural view of a second lens group according to embodiment 5 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the second lens group of embodiment 5;
fig. 13 shows a schematic structural view of a second lens group according to embodiment 6 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the second lens group of embodiment 6;
fig. 15 is a block diagram illustrating an electronic device according to an embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. The features, principles, and other aspects of the present application are described in detail below.
Fig. 1 is a schematic diagram showing an electronic apparatus according to an embodiment of the present application. Fig. 2 is a schematic diagram illustrating an electronic device according to another embodiment of the present application.
Referring to fig. 1 or 2, the electronic device may include an image capturing device, a focusing module image sensor, and a processor. The image pickup apparatus includes a first lens group a and a second lens group B, wherein the first lens group a may have a smaller angle of view than the second lens group B. The optical power and the lens size of the double cameras are reasonably assembled, the size of the camera device can be ensured to be thinner, and the imaging device can have better imaging quality under different wave bands and light conditions. The first lens group a and the second lens group B will be described in detail below, respectively.
In an exemplary embodiment, the first lens group may be an ultra-thin lens group, which may include, for example, six lenses having optical power, respectively, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, in order from an object side to an image side along the first optical axis. Among the first lens to the sixth lens of the first lens group, any adjacent two lenses may have an air space therebetween. The air gaps between the adjacent lenses are reasonably configured, so that the deflection of light between the lenses can be alleviated, and damage caused by collision between the adjacent lenses during assembly can be avoided.
In an exemplary embodiment, the first to sixth lenses of the first lens group may be made of a plastic material. The plastic material has simple processing technology, is favorable for mechanized mass production, has light weight, good performance design, easy realization of better design performance, good chemical stability, low cost compared with other materials, can ensure the cost of the combined lens, and is favorable for mass production.
In an exemplary embodiment, the first lens of the first lens group may be a meniscus lens having positive optical power, and the sixth lens of the first lens group may be a biconcave lens having negative optical power. The first lens in the first lens group has positive focal power, which is beneficial to the focal power distribution of the whole lens group and is beneficial to balancing the vertical axis chromatic aberration and the lateral chromatic aberration.
In an exemplary embodiment, the first lens group further includes a first electron-sensitive device disposed on an imaging surface of the first lens group, and light passing through each lens of the first lens group is imaged on the first electron-sensitive device.
In an exemplary embodiment, the second lens group may be a near infrared lens group, which may include, for example, four lenses having optical power, respectively, a first lens, a second lens, a third lens, and a fourth lens, in order from an object side to an image side along the second optical axis. Among the first to fourth lenses of the second lens group B, any adjacent two lenses may have an air space therebetween. The air gaps between the adjacent lenses are reasonably configured, so that the deflection of light between the lenses can be alleviated, and damage caused by collision between the adjacent lenses during assembly can be avoided.
In an exemplary embodiment, the first lens to the fourth lens of the second lens group may be made of a plastic material. The lens material of the second lens group is reasonably configured, so that the material cost can be saved, the process flow is simplified, the weight of the lens can be reduced, the trend of light and thin devices is met, and mass production and manufacturing are facilitated.
In an exemplary embodiment, the first lens of the second lens group has positive optical power, and the third lens of the second lens group has positive optical power. The first lens in the second lens group has positive focal power, which is beneficial to the focal power distribution of the whole lens group and is beneficial to balancing the vertical axis chromatic aberration and the lateral chromatic aberration.
In an exemplary embodiment, the second lens group further includes a second electron-sensitive device disposed on an imaging plane of the second lens group, and light passing through each lens of the second lens group is imaged on the second electron-sensitive device.
In an exemplary embodiment, an infrared bandpass filter is disposed between the fourth lens of the second lens group and the imaging surface of the second lens group, so that the imaging device can have better imaging quality under different wave bands and light conditions. The band-pass band of the infrared band-pass filter can be 860 nm-960 nm. Through the infrared band, chromatic aberration is not introduced into an optical system, and the diameter of the diffuse speckles is effectively controlled. And meanwhile, the infrared wave band is used for imaging, so that the interference of the environment visible light on imaging is reduced, and the signal-to-noise ratio of the output signal of the image sensor is improved.
In an exemplary embodiment, a distance TTLa between an object side surface of the first lens group and an imaging surface of the first lens group on the first optical axis and a distance TTLb between an object side surface of the first lens of the second lens group and an imaging surface of the second lens group on the second optical axis may satisfy: TTLa/TTLb is more than 0.8 and less than 1.3, for example, more than or equal to 0.9 and less than or equal to 1.13. The lens group sizes of the first lens group and the second lens group are reasonably distributed, so that the camera device is guaranteed to have smaller size.
In an exemplary embodiment, the maximum half field angle Semi-FOVa of the first lens group and the maximum half field angle Semi-FOVb of the second lens group may satisfy: semi-FOVa/Semi-FOVb < 1, for example, 0.82.ltoreq.Semi-FOVa/Semi-FOVb.ltoreq.0.995. The proportional relation between the maximum half field angle of the first lens group and the maximum half field angle of the second lens group is reasonably set, so that the imaging range of the first lens group and the second lens group can be better matched, and the quality of an output image of the double-lens-group imaging device is improved.
In an exemplary embodiment, a distance TTLa between an object side surface of the first lens group and an imaging surface of the first lens group on the first optical axis and a half of a diagonal length of an effective pixel region on the imaging surface of the first lens group ImgHa may satisfy TTLa/ImgHa < 1.8. The ratio of the total length of the lens group to the half image height of the first lens group is controlled within a reasonable numerical range, so that the miniaturization and the light weight of the first lens group are ensured, and the size requirement of the portable electronic equipment is met.
In an exemplary embodiment, a distance TTLb from the object side surface of the first lens element of the second lens group to the imaging surface of the second lens group on the second optical axis and a half of a diagonal length of the effective pixel area on the imaging surface of the second lens group ImgHb may satisfy: TTLb/ImgHb is less than or equal to 2. By controlling the ratio of the two components within a reasonable numerical range, the size of the second lens group can be effectively compressed, and the compact size characteristic of the image pickup device is ensured.
In an exemplary embodiment, the total effective focal length fb of the second lens group and the entrance pupil diameter EPDb of the second lens group may satisfy: 1 < fb/EPDB < 1.5. The ratio of the two is controlled within a reasonable numerical range, so that the second lens group has a larger aperture, which is beneficial to enhancing the imaging effect of the optical system in a weak light environment and reducing the aberration of the marginal view field.
In an exemplary embodiment, the effective focal length f2a of the second lens of the first lens group and the effective focal length f5a of the fifth lens of the first lens group may satisfy: -3 < f2a/f5a < -2. The proportional relation between the effective focal length of the second lens of the first lens group and the effective focal length of the fifth lens of the first lens group is reasonably controlled, so that the optical power is reasonably distributed, the increase of tolerance sensitivity caused by excessive concentration of the optical power is avoided, and the production yield is improved. Optionally, the second lens of the first lens group has negative optical power, and the fifth lens of the first lens group has positive optical power.
In an exemplary embodiment, a distance TDb between an object side surface of the first lens element of the second lens group and an image side surface of the fourth lens element of the second lens group on the second optical axis and a distance BFLb between an image side surface of the fourth lens element of the second lens group and an image plane of the second lens group on the second optical axis may satisfy: 1.5 < TDb/BFLb < 2, e.g., 1.6 < TDb/BFLb < 1.8. The ratio of the two is controlled within a reasonable numerical range, so that the space size of the lens on the optical axis can be reasonably distributed, and the better balance between reducing the system aberration and improving the assembly manufacturability of the module is achieved.
In an exemplary embodiment, the radius of curvature R1a of the object side surface of the first lens group and the radius of curvature R4a of the image side surface of the second lens of the first lens group may satisfy: 0.3 < R1a/R4a < 1, e.g., 0.4 < R1a/R4a < 0.8. The proportional relation between the curvature radius of the object side surface of the first lens group and the curvature radius of the image side surface of the second lens of the first lens group is reasonably arranged, so that better balance between system spherical aberration and astigmatism is achieved, and the imaging device has good imaging quality. Optionally, the object side surface of the first lens group is a convex surface, and the image side surface of the second lens of the first lens group is a concave surface.
In an exemplary embodiment, the effective radius DT62a of the image side surface of the sixth lens of the first lens group and half the diagonal length ImgHa of the effective pixel region on the imaging surface of the first lens group may satisfy: DT62a/ImgHa is 0.7 < 1. The proportion relation between the two is reasonably arranged, so that the overall length of the system is shortened, the miniaturization of the module is realized, the angle of the main light ray is reduced, and the light sensing efficiency of the chip is improved to obtain better balance.
In an exemplary embodiment, the effective radius DT42b of the image side surface of the fourth lens of the second lens group and half the diagonal length of the effective pixel region on the imaging surface of the second lens group ImgHb may satisfy: DT42b/ImgHb > 0.9. The proportion relation between the effective radius of the image side surface of the fourth lens of the second lens group and half of the diagonal line length of the effective pixel area on the imaging surface of the second lens group is reasonably controlled, so that the angle of the principal ray of the imaging surface is reduced, the photosensitive efficiency of the chip is improved, and the imaging quality of the module is improved.
In an exemplary embodiment, a distance SAG41b between an intersection point of the center thickness CT4b of the fourth lens of the second lens group and the object side surface of the fourth lens of the second lens group and the second optical axis to an effective radius vertex of the object side surface of the fourth lens of the second lens group on the second optical axis may satisfy: 0.6 < CT4b/SAG41b < 1. The proportion relation of the two is reasonably controlled, so that better balance between the manufacturability of lens processing and manufacturing and the small principal ray angle is achieved, the photosensitive efficiency of the chip is improved, and the imaging quality of the module is improved.
In an exemplary embodiment, both the first lens group and the second lens group may include an aperture stop. The aperture stop may be provided at an appropriate position as needed, for example, in a first lens group, the aperture stop may be provided between the object side and a first lens of the first lens group, and in a second lens group, the aperture stop may be provided between the object side and a first lens of the second lens group. Optionally, each of the first lens group and the second lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
In an exemplary embodiment, at least one of an object side surface of the first lens group to an image side surface of the sixth lens of the first lens group may be an aspherical mirror surface, and at least one of an object side surface of the first lens of the second lens group to an image side surface of the fourth lens of the second lens group may be an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Alternatively, the object side surface and the image side surface of all lenses in the first lens group and the second lens group of the image pickup device may be aspherical mirror surfaces.
Exemplary embodiments of the present application also provide an electronic apparatus including the image pickup device described above, wherein the first lens group and the second lens group are arranged in a horizontal direction or a vertical direction at one side of the electronic apparatus. According to the requirement, a lens group arrangement mode can be selected for device setting, so that the height difference of the first lens group and the second lens group is in a reasonable range, the assembly of a module is convenient, and meanwhile, the problem of MTF (Modulation Transfer Function ) height difference caused by lens decentration and inclination is reduced. It should be understood that the arrangement of the first lens group and the second lens group is not limited thereto, and the relative positions thereof may be adjusted according to actual design requirements.
Fig. 15 is a schematic diagram showing an electronic device according to an embodiment of the present application. As shown in fig. 15, the electronic apparatus includes an imaging device 1501, a focusing device 1504, and a processor 1505 of each embodiment in the present application. Wherein the image capturing apparatus 1501 includes a first lens group 1502 and a second lens group 1503. The first lens group 1502 and the second lens group 1503 are arranged in the horizontal direction or the vertical direction on one side of the electronic device. For example, the first lens group 1502 and the second lens group 1503 may be selectively arranged in the horizontal direction or the vertical direction of the electronic device according to the arrangement of other components in the electronic device. The focusing device 1504 is connected to the imaging device 1501 and configured to acquire a distance from the imaging device 1501 to a subject. Processor 1505 is connected to imaging device 1501 and to focusing device 1504 and is configured to: at least one of the first lens group 1502 and the second lens group 1503 is activated in response to the distance of the image pickup device 1501 from the subject and/or the brightness condition of the photographed scene. The distance between the imaging device 1501 and the object may be obtained by the focal length measuring device 1504 in a laser ranging manner, or the corresponding distance may be estimated by analyzing the edge sharpness of the object in the obtained image. By switching different lens groups, high-quality imaging can be realized in various shooting scenes.
However, it will be appreciated by those skilled in the art that the number of lenses in each lens group that make up the image capturing apparatus can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. For example, although the first lens group is described with six lenses as an example and the second lens group is described with four lenses as an example in the embodiment, the first lens group is not limited to including six lenses and the second lens group is not limited to including four lenses. Each lens group in the image pickup apparatus may further include other number of lenses, if necessary.
Specific lens group configurations are detailed below in connection with embodiments 1-6. Examples 1 to 3 described in detail below are a first lens group applicable to an image pickup apparatus of the present application, and examples 4 to 6 are a second lens group applicable to an image pickup apparatus of the present application. The following embodiments have been chosen to give consideration to compatibility matching between these lens groups. In other words, the following embodiments can be combined to form 9 different image pickup apparatuses according to the lens group types thereof. The configuration of these image pickup apparatuses is as follows:
(1) example 1+ example 4;
(2) Example 1+ example 5;
(3) example 1+ example 6;
(4) example 2+ example 4;
(5) example 2+ example 5;
(6) example 2+ example 6;
(7) example 3+ example 4;
(8) example 3+ example 5; and
(9) example 3+ example 6.
Specific examples of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
The first lens group according to embodiment 1 of the present application is described below with reference to fig. 3 to 4D. Fig. 3 shows a schematic structural view of a first lens group according to embodiment 1 of the present application.
As shown in fig. 3, the first lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 1 shows the basic parameter table of the first lens group of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In the present embodiment, the total effective focal length fa=3.90 mm of the first lens group, the distance ttla=4.63 mm on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, the maximum half field angle Semi-fova=37.9° of the first lens group, and the f-number fnoa=2.18 of the first lens group.
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S12 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.1469E-01 | -4.6532E-01 | 8.9086E-01 | -1.3848E+00 | 1.4511E+00 | -8.6837E-01 | 2.1252E-01 |
| S2 | -1.8120E-01 | 5.0243E-01 | -4.0249E-01 | -8.8386E-01 | 2.0083E+00 | -1.4648E+00 | 3.5813E-01 |
| S3 | -2.2450E-01 | 7.6049E-01 | -8.8681E-01 | -3.7060E-01 | 1.7776E+00 | -1.4681E+00 | 4.0063E-01 |
| S4 | 4.2022E-04 | 4.2941E-01 | -1.1537E+00 | 2.2121E+00 | -2.8403E+00 | 2.1327E+00 | -6.5171E-01 |
| S5 | -8.3197E-02 | -3.0664E-01 | 8.7193E-01 | -1.4201E+00 | 1.2505E+00 | -5.5620E-01 | 9.5811E-02 |
| S6 | -7.5829E-02 | -2.0065E-01 | 4.6219E-01 | -5.6033E-01 | 3.4787E-01 | -9.2835E-02 | 7.4012E-03 |
| S7 | 1.7853E-03 | -8.6004E-02 | 2.9763E-01 | -4.1875E-01 | 2.8893E-01 | -9.7765E-02 | 1.3023E-02 |
| S8 | -7.5146E-03 | 8.2863E-03 | 5.2811E-02 | -8.7121E-02 | 5.4131E-02 | -1.5466E-02 | 1.6989E-03 |
| S9 | -1.0653E-02 | 3.5566E-02 | -3.3019E-02 | 1.5105E-02 | -5.1310E-03 | 1.2187E-03 | -1.2618E-04 |
| S10 | 3.3038E-02 | -3.6517E-02 | 6.1200E-02 | -3.8564E-02 | 1.1538E-02 | -1.6740E-03 | 9.4491E-05 |
| S11 | -1.5829E-02 | 1.0350E-02 | -7.0299E-03 | 2.8567E-03 | -5.1942E-04 | 4.0045E-05 | -9.3258E-07 |
| S12 | -3.3639E-02 | 1.6238E-02 | -7.8376E-03 | 2.1668E-03 | -3.6593E-04 | 3.3191E-05 | -1.1789E-06 |
TABLE 2
Fig. 4A shows an on-axis chromatic aberration curve of the first lens group of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the first lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the first lens group of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the first lens group of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the first lens group of embodiment 1 can achieve good imaging quality.
Example 2
The first lens group according to embodiment 2 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of a first lens group according to embodiment 2 of the present application.
As shown in fig. 5, the first lens group sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present embodiment, the total effective focal length fa=3.61 mm of the first lens group, the distance ttla=4.34 mm on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, the maximum half field angle Semi-fova=34.0° of the first lens group, and the f-number fnoa=2.05 of the first lens group.
Table 3 shows the basic parameter table of the first lens group of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 3 Table 3
In embodiment 2, the object side surface of any one of the first to sixth lenses E1 to E6And the image side surfaces are aspheric. Table 4 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S12 in example 2 4 、A 6 、A 8 、A 10 、A 12 And A 14 。
TABLE 4 Table 4
Fig. 6A shows an on-axis chromatic aberration curve of the first lens group of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the first lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the first lens group of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the first lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the first lens group of embodiment 2 can achieve good imaging quality.
Example 3
The first lens group according to embodiment 3 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural view of a first lens group according to embodiment 3 of the present application.
As shown in fig. 7, the first lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present embodiment, the total effective focal length fa=3.23 mm of the first lens group, the distance ttla=4.12 mm on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, the maximum half field angle Semi-fova=41.1° of the first lens group, and the f-number fnoa=2.20 of the first lens group.
Table 5 shows the basic parameter table of the first lens group of example 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 5
In embodiment 3, the object side surface and the image side surface of any one of the first to sixth lenses E1 to E6 are aspherical surfaces. Table 6 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S12 in example 3 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.1016E-02 | 5.6901E-03 | 6.5786E-02 | -1.7285E-01 | 2.3621E-01 | -1.2731E-01 | -8.7846E-11 |
| S2 | -5.2705E-02 | 1.9934E-01 | -3.5887E-01 | 3.8916E-01 | -2.3139E-01 | -1.0166E-02 | 1.1380E-10 |
| S3 | -2.5473E-01 | 5.3213E-01 | -7.5597E-01 | 5.8919E-01 | -3.0636E-01 | -3.0506E-10 | -2.3731E-10 |
| S4 | -2.6644E-01 | 6.1222E-01 | -9.8553E-01 | 9.6025E-01 | -4.9051E-01 | 5.7000E-03 | 2.1078E-10 |
| S5 | -6.3263E-02 | 5.8223E-02 | 2.6079E-01 | -1.0993E+00 | 1.7228E+00 | -8.4396E-01 | 5.8253E-09 |
| S6 | -3.8849E-02 | -7.8317E-02 | 4.5277E-01 | -8.7641E-01 | 6.5860E-01 | 1.5895E-02 | -1.7877E-07 |
| S7 | -3.4905E-01 | 2.9667E-01 | -1.9552E-01 | -1.2680E-02 | 3.4034E-02 | 0.0000E+00 | 0.0000E+00 |
| S8 | -4.0132E-01 | 0.0000E+00 | 2.4501E-01 | 1.5417E-02 | -2.0158E-01 | 1.7485E-01 | -4.8061E-02 |
| S9 | -7.2789E-04 | -1.3823E-01 | 6.8260E-02 | 2.9714E-03 | -2.1570E-02 | 6.2481E-03 | 0.0000E+00 |
| S10 | 2.7850E-01 | -6.8637E-02 | -7.3464E-02 | 8.5008E-03 | -5.1362E-04 | 1.3067E-03 | -3.2734E-04 |
| S11 | 4.4377E-02 | 3.7617E-02 | 3.0032E-03 | -2.5098E-03 | -2.7406E-04 | 6.7663E-05 | -3.8440E-06 |
| S12 | 7.4152E-02 | -1.2526E-02 | -4.7898E-03 | 8.3065E-04 | -4.5985E-06 | -2.8808E-06 | -1.3002E-06 |
TABLE 6
Fig. 8A shows an on-axis chromatic aberration curve of the first lens group of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the first lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the first lens group of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the first lens group of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the first lens group of embodiment 3 can achieve good imaging quality.
Example 4
The second lens group according to embodiment 4 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural view of a second lens group according to embodiment 4 of the present application.
As shown in fig. 9, the second lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, infrared band-pass filter E5 and imaging surface S11.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
In the present embodiment, the total effective focal length fb=2.66 mm of the second lens group, the distance ttlb=4.34 mm on the optical axis from the object side surface S1 to the imaging surface S11 of the first lens E1, the maximum half field angle Semi-fovb=41.3° of the second lens group, and the f-number fnob=1.32 of the second lens group.
Table 7 shows a basic parameter table of the second lens group of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 7
In embodiment 4, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 8 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S8 in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 8.1191E-02 | -1.9544E-01 | 3.8864E-01 | -5.4588E-01 | 4.0360E-01 | -1.3996E-01 | 1.0188E-02 |
| S2 | -7.8098E-02 | 1.0940E-01 | -3.5249E-01 | 4.8385E-01 | -3.9253E-01 | 1.7470E-01 | -3.4079E-02 |
| S3 | 9.3860E-02 | -1.6864E+00 | 3.8837E+00 | -5.3323E+00 | 4.3953E+00 | -1.9294E+00 | 3.4166E-01 |
| S4 | 6.3445E-01 | -1.9149E+00 | 2.7423E+00 | -2.5701E+00 | 1.5127E+00 | -4.9000E-01 | 6.5301E-02 |
| S5 | 1.2188E+00 | -2.0168E+00 | 2.3883E+00 | -1.9310E+00 | 9.8943E-01 | -2.9064E-01 | 3.7581E-02 |
| S6 | -2.0492E-01 | 3.2375E-01 | -2.1075E-01 | 3.8840E-02 | 1.8604E-02 | -1.3379E-02 | 2.7990E-03 |
| S7 | -2.9180E-01 | 2.2676E-01 | -1.8275E-01 | 7.9319E-02 | -1.8204E-02 | 2.1415E-03 | -1.0280E-04 |
| S8 | 1.1182E-01 | -1.3751E-01 | 5.1887E-02 | -1.0247E-02 | 1.0191E-03 | -2.1685E-05 | -2.9114E-06 |
TABLE 8
Fig. 10A shows an on-axis chromatic aberration curve of the second lens group of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve of the second lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the second lens group of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. Fig. 10D shows a magnification chromatic aberration curve of the second lens group of embodiment 4, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the second lens group of embodiment 4 can achieve good imaging quality.
Example 5
The second lens group according to embodiment 5 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural view of a second lens group according to embodiment 5 of the present application.
As shown in fig. 11, the second lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, infrared band-pass filter E5 and imaging surface S11.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
In the present embodiment, the total effective focal length fb=2.50 mm of the second lens group, the distance ttlb=4.09 mm on the optical axis from the object side surface S1 to the imaging surface S11 of the first lens E1, the maximum half field angle Semi-fovb=41.3° of the second lens group, and the f-number fnob=1.32 of the second lens group.
Table 9 shows a basic parameter table of the second lens group of embodiment 5, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 9
In embodiment 5, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 10 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S8 in example 5 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 9.0911E-02 | -2.4246E-01 | 5.4137E-01 | -8.4510E-01 | 6.7391E-01 | -2.3045E-01 | 1.2103E-03 |
| S2 | -8.7573E-02 | 1.3056E-01 | -4.7406E-01 | 7.0734E-01 | -6.2631E-01 | 3.0430E-01 | -6.6085E-02 |
| S3 | 1.9212E-01 | -2.4260E+00 | 6.2512E+00 | -9.6621E+00 | 8.8940E+00 | -4.3442E+00 | 8.5615E-01 |
| S4 | 7.7146E-01 | -2.6263E+00 | 4.1784E+00 | -4.2991E+00 | 2.7656E+00 | -9.7889E-01 | 1.4259E-01 |
| S5 | 1.4460E+00 | -2.6637E+00 | 3.4468E+00 | -3.0196E+00 | 1.6701E+00 | -5.2747E-01 | 7.2709E-02 |
| S6 | -2.4640E-01 | 5.0769E-01 | -4.3763E-01 | 1.5554E-01 | 1.0312E-03 | -2.0814E-02 | 5.5037E-03 |
| S7 | -2.8222E-01 | 2.9836E-01 | -2.7669E-01 | 1.3391E-01 | -3.4140E-02 | 4.4633E-03 | -2.3849E-04 |
| S8 | 1.4133E-01 | -1.8177E-01 | 7.0548E-02 | -1.2697E-02 | 5.6604E-04 | 1.5389E-04 | -1.8449E-05 |
Table 10
Fig. 12A shows an on-axis chromatic aberration curve of the second lens group of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the second lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the second lens group of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a magnification chromatic aberration curve of the second lens group of embodiment 5, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the second lens group of embodiment 5 can achieve good imaging quality.
Example 6
The second lens group according to embodiment 6 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic structural view of a second lens group according to embodiment 6 of the present application.
As shown in fig. 13, the second lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, infrared band-pass filter E5 and imaging surface S11.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
In the present embodiment, the total effective focal length fb=2.63 mm of the second lens group, the distance ttlb=4.57 mm on the optical axis from the object side surface S1 to the imaging surface S11 of the first lens E1, the maximum half field angle Semi-fovb=41.3° of the second lens group, and the f-number fnob=1.29 of the second lens group.
Table 11 shows a basic parameter table of the second lens group of example 6, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 11
In embodiment 6, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 12 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S8 in example 6 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
Table 12
Fig. 14A shows an on-axis chromatic aberration curve of the second lens group of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the second lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the second lens group of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a magnification chromatic aberration curve of the second lens group of embodiment 6, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the second lens group of embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 satisfy the relationships shown in table 13, respectively.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 |
| fb/EPDb | 1.32 | 1.32 | 1.29 | |||
| TTLa/ImgHa | 1.50 | 1.77 | 1.48 | |||
| TTLb/ImgHb | 1.90 | 1.90 | 2.00 | |||
| TDb/BFLb | 1.65 | 1.65 | 1.78 | |||
| f2a/f5a | -2.17 | -2.51 | -2.58 | |||
| DT42b/ImgHb | 0.95 | 0.92 | 0.94 | |||
| CT4b/SAG41b | 0.95 | 0.98 | 0.66 | |||
| R1a/R4a | 0.42 | 0.53 | 0.78 | |||
| DT62a/ImgHa | 0.82 | 0.81 | 0.92 |
TABLE 13
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (16)
1. An image pickup apparatus comprising a first lens group and a second lens group, characterized in that,
the first lens group sequentially comprises a first group of first lenses, a first group of second lenses, a first group of third lenses, a first group of fourth lenses, a first group of fifth lenses and a first group of sixth lenses which have optical power from the object side to the image side along a first optical axis,
the first lens group has positive focal power, the object side surface of the first lens group is a convex surface, and the image side surface of the first lens group is a concave surface;
The first group of second lenses have negative focal power, and the image side surface of the first group of second lenses is concave;
the object side surface of the first group of third lenses is a convex surface;
the first group of fifth lenses have positive focal power, and the image side surface of the first group of fifth lenses is a convex surface;
the first group of sixth lenses have negative focal power, the object side surface of the first group of sixth lenses is a concave surface, and the image side surface of the first group of sixth lenses is a concave surface;
the sign of the optical power of the first group of third lenses and the sign of the optical power of the first group of fourth lenses are opposite;
the first lens group has six lenses of optical power,
the second lens group sequentially comprises a second group of first lens, a second group of second lens, a second group of third lens and a second group of fourth lens with focal power, and an infrared band-pass filter arranged between the second group of fourth lens and an imaging surface of the second lens group along a second optical axis from an object side to an image side, wherein,
the second group of first lenses have positive focal power, and the object side surface of the second group of first lenses is a convex surface;
the second group of second lenses have negative focal power, the object side surface of the second group of second lenses is concave, and the image side surface of the second group of second lenses is convex;
the second group of third lenses have positive focal power, the object side surface of the second group of third lenses is concave, and the image side surface of the second group of third lenses is convex;
the second group of fourth lenses have positive focal power, the object side surface of the second group of fourth lenses is a convex surface, and the image side surface of the second group of fourth lenses is a concave surface;
The number of lenses of the second lens group having optical power is four,
the maximum half field angle Semi-FOVa of the first lens group and the maximum half field angle Semi-FOVb of the second lens group satisfy: semi-FOVa/Semi-FOvb < 0.8 < 1;
the effective focal length f2a of the first group second lens and the effective focal length f5a of the first group fifth lens satisfy: -3 < f2a/f5a < -2.
2. The image capturing apparatus according to claim 1, wherein a distance TTLa from an object side surface of the first lens group to an imaging surface of the first lens group on the first optical axis and a half ImgHa of a diagonal length of an effective pixel region on the imaging surface of the first lens group satisfy:
1.48≤TTLa/ImgHa＜1.8。
3. the image capturing apparatus according to claim 1, wherein a distance TTLb from an object side surface of the first lens of the second lens group to an imaging surface of the second lens group on the second optical axis and a half of a diagonal length ImgHb of an effective pixel region on the imaging surface of the second lens group satisfy:
1.90≤TTLb/ImgHb≤2。
4. the image pickup apparatus according to claim 1, wherein a total effective focal length fb of the second lens group and an entrance pupil diameter EPDb of the second lens group satisfy:
1＜fb/EPDb＜1.5。
5. The image capturing device according to claim 1, wherein a distance TDb on the second optical axis from an object side surface of the second group first lens to an image side surface of the second group fourth lens and a distance BFLb on the second optical axis from an image side surface of the second group fourth lens to an image plane of the second lens group satisfy:
1.5＜TDb/BFLb＜2。
6. the image capturing apparatus according to claim 1, wherein a radius of curvature R1a of an object side surface of the first group of first lenses and a radius of curvature R4a of an image side surface of the first group of second lenses satisfy:
0.3＜R1a/R4a＜1。
7. the image capturing apparatus according to claim 1, wherein an effective radius DT62a of an image side surface of the first group sixth lens and a half of a diagonal length ImgHa of an effective pixel region on an imaging surface of the first lens group satisfy:
0.7＜DT62a/ImgHa＜1。
8. the image capturing apparatus according to claim 1, wherein an effective radius DT42b of an image side surface of the second group fourth lens and a half of a diagonal length ImgHb of an effective pixel region on an imaging surface of the second lens group satisfy:
0.9＜DT42b/ImgHb≤0.95。
9. the image capturing apparatus according to claim 1, wherein a distance SAG41b on the second optical axis from an intersection point of the center thickness CT4b of the second group fourth lens with the object side surface of the second group fourth lens and the second optical axis to an effective radius vertex of the object side surface of the second group fourth lens satisfies:
0.6＜CT4b/SAG41b＜1。
10. The image pickup apparatus according to claim 1, wherein the band-pass band of the infrared band-pass filter is 860nm to 960nm.
11. The image capturing device according to claim 2 or 3, wherein a distance TTLa between an object side surface of the first lens group and an imaging surface of the first lens group on the first optical axis and a distance TTLb between an object side surface of the second lens group and an imaging surface of the second lens group on the second optical axis satisfy:
0.8＜TTLa/TTLb＜1.3。
12. the image pickup apparatus according to any one of claims 1 to 10, wherein any adjacent two lenses in the first lens group each have an air space on the first optical axis.
13. The image pickup apparatus according to any one of claims 1 to 10, wherein any adjacent two lenses in the second lens group each have an air space on the second optical axis.
14. The image pickup apparatus according to any one of claims 1 to 10, wherein all lenses in the first lens group are made of a plastic material.
15. The image pickup apparatus according to any one of claims 1 to 10, wherein all lenses in the second lens group are made of a plastic material.
16. An electronic apparatus comprising the image pickup device according to any one of claims 1 to 15, wherein the first lens group and the second lens group are provided on the same side of the electronic apparatus, and the first lens group and the second lens group are arranged in a horizontal direction or a vertical direction on the same side of the electronic apparatus.
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| JP2002202454A (en) * | 2000-12-28 | 2002-07-19 | Sumitomo Electric Ind Ltd | ftheta LENS |
| CN107783245A (en) * | 2016-08-24 | 2018-03-09 | 宁波舜宇光电信息有限公司 | Dual camera zoom module |
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