CN210894831U - Optical imaging system - Google Patents

Abstract

The application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens having optical power, and an aspherical surface having non-rotational symmetry with respect to at least one mirror surface of an object side surface of the first lens to an image side surface of the sixth lens, the optical imaging system having an X-axis direction and a Y-axis direction perpendicular to each other on a plane perpendicular to the optical axis. Wherein, in the Y-axis direction, half ImgH of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system and half Semi-FOV of a maximum field angle of the optical imaging system satisfy the following conditional expression: ImgH > 4 mm; Semi-FOV > 60.

Description

Optical imaging system

Technical Field

The present application relates to the field of optical elements, and in particular, to an optical imaging system.

Background

The imaging quality, the image plane size and the field angle size of the lens of the portable electronic product such as the mobile phone are important indexes for measuring the performance of the portable electronic product such as the mobile phone. At present, a lens of a portable electronic product such as a mobile phone is basically formed by an aspheric surface type, which is a rotationally symmetric spherical surface, has a high degree of freedom in a meridian plane, can correct axial aberration, but is difficult to correct axial and external aberration, thereby limiting improvement of image quality.

SUMMERY OF THE UTILITY MODEL

An aspect of the present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which have focal power. At least one mirror surface of the object side surface of the first lens to the image side surface of the sixth lens is a non-rotationally symmetric aspheric surface. The optical imaging system has an X-axis direction and a Y-axis direction perpendicular to each other on a plane perpendicular to the optical axis.

In one embodiment, in the Y-axis direction, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, may satisfy: ImgH > 4 mm.

In one embodiment, in the Y-axis direction, half of the Semi-FOV of the maximum field angle of the optical imaging system may satisfy: Semi-FOV > 60.

In one embodiment, the effective focal length fx of the X-axis direction and the effective focal length f3 of the third lens satisfy: fx/f3 is more than 0.5 and less than 1.0.

In one embodiment, the effective focal length fy in the Y-axis direction and the effective focal length f5 of the fifth lens satisfy: fy/f5 is more than 0.5 and less than 1.0.

In one embodiment, in the Y-axis direction, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT61 of the object-side surface of the sixth lens may satisfy: 0.7 < DT11/DT61 < 1.2.

In one embodiment, in the Y-axis direction, the edge thickness ET4 of the fourth lens and the edge thickness ET6 of the sixth lens may satisfy: 0.5 < ET4/ET6 < 1.0.

In one embodiment, in the Y-axis direction, the edge thickness ET1 of the first lens and the edge thickness ET3 of the third lens may satisfy: 0.5 < ET1/ET3 < 1.0.

In one embodiment, in the Y-axis direction, a distance SAG11 on the optical axis from an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, and a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens may satisfy: 0.5 < SAG12/SAG11 < 1.0.

In one embodiment, in the Y-axis direction, a distance SAG52 on the optical axis from an intersection point of the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens and a center thickness CT5 on the optical axis of the fifth lens may satisfy: -1.0 < SAG52/CT5 < -0.5.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens may satisfy: f4/f1 is more than 0.3 and less than 1.3.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the effective focal length f1 of the first lens may satisfy: r1/f1 is more than 0.5 and less than 1.0.

In one embodiment, in the Y-axis direction, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 0.4 < R3/(R3+ R4) < 1.0.

In one embodiment, in the Y-axis direction, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy: -1.0 < R6/R5 < -0.5.

In one embodiment, in the Y-axis direction, the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: -1.0 < R10/R8 < -0.3.

In one embodiment, in the Y-axis direction, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens may satisfy: 0.5 < R12/R11 < 1.5.

In one embodiment, the sum Σ AT of the center thickness CT1 of the first lens in the optical axis and the separation distance on the optical axis of any adjacent two lenses of the first lens to the sixth lens may satisfy: 0.2 < CT 1/Sigma AT < 0.7.

In one embodiment, the central thickness CT5 of the fifth lens on the optical axis and the maximum effective radius DT52 of the image side surface of the fifth lens may satisfy: 0.2 < CT5/DT52 < 0.7.

In one embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 0.2 < CT4/CT3 < 0.7.

In one embodiment, the central thickness CT2 of the second lens on the optical axis and the separation distance T23 of the second lens and the third lens on the optical axis may satisfy: 0.3 < CT2/T23 < 0.8.

In one embodiment, the object side surface of the first lens may be concave.

In one embodiment, the object-side surface of the second lens element can be convex and the image-side surface can be concave.

In one embodiment, the fourth lens may have a negative optical power, and the image-side surface thereof may be concave.

In one embodiment, the fifth lens may have a positive optical power, and the image side surface thereof may be convex.

Another aspect of the present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: a first lens having a refractive power, an object side surface of which is concave; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; a third lens having optical power; a fourth lens having a negative refractive power, an image-side surface of which is concave; the image side surface of the fifth lens is a convex surface; and a sixth lens having optical power. At least one mirror surface of the object side surface of the first lens to the image side surface of the sixth lens is a non-rotationally symmetric aspheric surface. The optical imaging system has an X-axis direction and a Y-axis direction perpendicular to each other on a plane perpendicular to the optical axis.

The free-form surface is a non-rotational symmetrical spherical surface, has high freedom degrees in a meridian plane and a sagittal plane, and can correct the off-axis aberration and the on-axis aberration to the maximum extent, thereby improving the imaging quality of the lens of portable electronic products such as mobile phones and the like. The large image plane means higher resolution for an optical imaging system of portable electronic products such as mobile phones; the wide angle means that the field of view is wider, and more object information can be obtained. With the above configuration, the optical imaging system according to the present application can have at least one advantageous effect of a large image plane, an ultra-wide angle, a free-form surface, high imaging quality, and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;

FIG. 2 schematically illustrates the case where the RMS spot diameter of the optical imaging system of embodiment 1 is in the first quadrant;

fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;

FIG. 4 schematically illustrates the RMS spot diameter in the first quadrant for the optical imaging system of embodiment 2;

fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;

FIG. 6 schematically illustrates the RMS spot diameter in the first quadrant for the optical imaging system of embodiment 3;

fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;

FIG. 8 schematically illustrates the RMS spot diameter in the first quadrant for the optical imaging system of example 4;

fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;

FIG. 10 schematically illustrates the RMS spot diameter in the first quadrant for the optical imaging system of example 5;

fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application;

fig. 12 schematically illustrates the case where the RMS spot diameter of the optical imaging system of example 6 is in the first quadrant.

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 the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present 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 this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An optical imaging system according to an exemplary embodiment of the present application may include six lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively. The six lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the sixth lens can have a spacing distance therebetween.

In an exemplary embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the sixth lens is a non-rotationally symmetric aspheric surface.

In an exemplary embodiment, the optical imaging system has an X-axis direction and a Y-axis direction perpendicular to each other on a plane perpendicular to the optical axis.

The non-rotationally symmetrical aspheric surface is introduced, so that off-axis meridional aberration and sagittal aberration of the optical imaging system can be performed, and the imaging quality of the optical imaging system is improved.

In an exemplary embodiment, the object side surface of the first lens may be concave.

In an exemplary embodiment, the object-side surface of the second lens element may be convex and the image-side surface may be concave.

In an exemplary embodiment, the fourth lens may have a negative optical power, and the image-side surface thereof may be concave.

In an exemplary embodiment, the fifth lens may have a positive optical power, and the image side surface thereof may be convex.

The positive and negative distribution of the focal power of each lens of the optical imaging system and the lens surface curvature are reasonably controlled, the low-order aberration of the optical imaging system can be effectively balanced, and when the focal power of the fourth lens is negative, the off-axis aberration of the optical imaging system can be corrected, so that the imaging quality is improved; when the focal power of the fifth lens is positive, the characteristic of large field of view is favorably realized, a larger field angle range is obtained, and the collection capability of the optical imaging system on object information is improved.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: ImgH > 4mm, wherein ImgH is half the length of the diagonal line of the effective pixel area on the imaging surface of the optical imaging system in the Y-axis direction. More specifically, ImgH further satisfies: ImgH > 4.4 mm. The requirement that ImgH is larger than 4mm can be met, the characteristic of a large image plane of the optical imaging system can be realized, and the optical imaging system has higher resolution.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: the Semi-FOV is > 60 degrees, wherein the Semi-FOV is half of the maximum field angle of the optical imaging system in the Y-axis direction. More specifically, the Semi-FOV further satisfies: Semi-FOV > 61. The Semi-FOV is more than 60 degrees, and the obtained object information can be expanded.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < fx/f3 < 1.0, where fx is the effective focal length in the X-axis direction and f3 is the effective focal length of the third lens. Satisfying 0.5 < fx/f3 < 1.0, the spherical aberration contribution amount of the third lens can be controlled within a reasonable range, so that the on-axis field of view obtains good imaging quality.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < fy/f5 < 1.0, where fy is the effective focal length in the Y-axis direction, and f5 is the effective focal length of the fifth lens. More specifically, fy and f5 further satisfy: 0.5 < fy/f5 < 0.9. The requirement that the fy/f5 is more than 0.5 and less than 1.0 can control the field curvature contribution of the fifth lens within a reasonable range.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.7 < DT11/DT61 < 1.2, where DT11 is the maximum effective radius of the object-side surface of the first lens in the Y-axis direction and DT61 is the maximum effective radius of the object-side surface of the sixth lens in the Y-axis direction. More specifically, DT11 and DT61 further satisfy: 0.7 < DT11/DT61 < 1.1. The optical imaging system can be reduced in size and miniaturized, and the resolution of the optical imaging system is improved, wherein DT11/DT61 is more than 0.7 and less than 1.2.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < ET4/ET6 < 1.0, wherein ET4 is the edge thickness of the fourth lens in the Y-axis direction, and ET6 is the edge thickness of the sixth lens in the Y-axis direction. More specifically, ET4 and ET6 further satisfy: 0.5 < ET4/ET6 < 0.9. The requirements of ET4/ET6 of 0.5 and 1.0 are met, high-level spherical aberration is balanced, and the sensitivity of the optical imaging system is reduced.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < ET1/ET3 < 1.0, wherein ET1 is the edge thickness of the first lens in the Y-axis direction, and ET3 is the edge thickness of the third lens in the Y-axis direction. More specifically, ET1 and ET3 further satisfy: 0.7 < ET1/ET3 < 1.0. The requirement that ET1/ET3 is more than 0.5 and less than 1.0 can reduce the deflection angle of light rays, thereby reducing the sensitivity of the optical imaging system.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 & lt SAG12/SAG11 & lt 1.0, wherein SAG11 is a distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, and SAG12 is a distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens. More specifically, SAG12 and SAG11 further may satisfy: 0.6 < SAG12/SAG11 < 1.0. Satisfying 0.5 < SAG12/SAG11 < 1.0 helps correct the overall aberration of the optical imaging system.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -1.0 < SAG52/CT5 < -0.5, wherein SAG52 is a distance on the optical axis from an intersection point of the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens in the Y-axis direction, and CT5 is a center thickness of the fifth lens on the optical axis. More specifically, SAG52 and CT5 further satisfy: -1.0 < SAG52/CT5 < -0.6. Satisfy-1.0 < SAG52/CT5 < -0.5, the shape of the fifth lens can be controlled to ensure the processability.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.3 < f4/f1 < 1.3, wherein f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens. More specifically, f4 and f1 may further satisfy: f4/f1 is more than 0.4 and less than 1.1. Satisfying 0.3 < f4/f1 < 1.3, the field curvature contributions of the first lens and the fourth lens can be controlled within a reasonable range.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < R1/f1 < 1.0, where R1 is the radius of curvature of the object side surface of the first lens in the Y-axis direction, and f1 is the effective focal length of the first lens. More specifically, R1 and f1 may further satisfy: r1/f1 is more than 0.5 and less than 0.9. The optical imaging system can obtain larger field angle by satisfying 0.5 < R1/f1 < 1.0.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.4 < R3/(R3+ R4) < 1.0, where R3 is a radius of curvature of an object-side surface of the second lens in the Y-axis direction, and R4 is a radius of curvature of an image-side surface of the second lens in the Y-axis direction. More specifically, R3 and R4 may further satisfy: 0.4 < R3/(R3+ R4) < 0.7. Satisfies 0.4 < R3/(R3+ R4) < 1.0, and can correct chromatic aberration of the optical imaging system and balance each aberration of the optical imaging system.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -1.0 < R6/R5 < -0.5, wherein R5 is the radius of curvature of the object-side surface of the third lens in the Y-axis direction, and R6 is the radius of curvature of the image-side surface of the third lens in the Y-axis direction. More specifically, R6 and R5 may further satisfy: -0.8 < R6/R5 < -0.5. Satisfy-1.0 < R6/R5 < -0.5, can control the distortion of the optical imaging system in a reasonable range, guarantee better imaging quality.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -1.0 < R10/R8 < -0.3, wherein R8 is a radius of curvature of the image-side surface of the fourth lens in the Y-axis direction, and R10 is a radius of curvature of the image-side surface of the fifth lens in the Y-axis direction. Satisfies-1.0 < R10/R8 < -0.3, and can effectively balance the on-axis aberration generated by the optical imaging system.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < R12/R11 < 1.5, wherein R11 is a radius of curvature of an object-side surface of the sixth lens in a Y-axis direction, and R12 is a radius of curvature of an image-side surface of the sixth lens in the Y-axis direction. More specifically, R12 and R11 may further satisfy: 0.7 < R12/R11 < 1.2. The requirement that R12/R11 is more than 0.5 and less than 1.5 is met, the high-level spherical aberration is balanced, and the sensitivity of the optical imaging system is reduced.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.2 < CT1/Σ AT < 0.7, where CT1 is the center thickness of the first lens on the optical axis, and Σ AT is the sum of the separation distances on the optical axis of any adjacent two of the first to sixth lenses. More specifically, CT1 and Σ AT may further satisfy: 0.2 < CT 1/Sigma AT < 0.5. The requirement that CT 1/Sigma AT is more than 0.2 and less than 0.7 is met, the excessive deflection of light rays can be avoided, and the processing difficulty of the optical imaging system is reduced.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.2 < CT5/DT52 < 0.7, where CT5 is the central thickness of the fifth lens on the optical axis and DT52 is the maximum effective radius of the image-side surface of the fifth lens in the Y-axis direction. More specifically, CT5 and DT52 further satisfy: 0.3 < CT5/DT52 < 0.7. The requirements of 0.2 < CT5/DT52 < 0.7 are met, the shape of the fifth lens can be effectively controlled, and the processability of the fifth lens is ensured.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.2 < CT4/CT3 < 0.7, wherein CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT4 and CT3 further satisfy: 0.2 < CT4/CT3 < 0.6. The requirement that the CT4/CT3 is more than 0.2 and less than 0.7 is met, the size distribution of the lens is uniform, the size of an optical imaging system is effectively reduced, the overlarge volume of the optical imaging system is avoided, the assembly difficulty of the lens is reduced, and the high space utilization rate is realized.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.3 < CT2/T23 < 0.8, where CT2 is the central thickness of the second lens on the optical axis, and T23 is the separation distance between the second lens and the third lens on the optical axis. More specifically, CT2 and T23 further satisfy: 0.4 < CT2/T23 < 0.8. The requirement of 0.3 < CT2/T23 < 0.8 is met, the size distribution of the lens is uniform, the assembly stability of the optical imaging system is ensured, the aberration of the whole optical imaging system is reduced, and the total length of the optical imaging system is shortened.

In an exemplary embodiment, the optical imaging system according to the present application further comprises a stop disposed between the second lens and the third lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface. The application provides an optical imaging system which has the characteristics of a large image surface, an ultra-wide angle and the like and adopts an aspheric surface and a free-form surface. The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the optical imaging system can be effectively reduced, the processability of the optical imaging system can be improved, and the optical imaging system is more favorable for production and processing.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The aspheric 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 better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, and sixth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging system may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical imaging system is not limited to including six lenses. The optical imaging system may also include other numbers of lenses, if desired.

Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2. Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 a basic parameter table of the optical imaging system of embodiment 1, in which the units of the radius of curvature Y, the radius of curvature X, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In the present example, the effective focal length fx of the optical imaging system in the X-axis direction is 2.54mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.54mm, the total length TTL of the optical imaging system (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging system) is 7.27mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging system is 4.50mm, half Smei-FOV of the maximum field angle of the optical imaging system is 62.4 °, and the ratio f/EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.20.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the fifth lens E5 are both rotationally symmetric aspheric surfaces, and the surface shape x of each rotationally symmetric aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 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 i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S10 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

8.4626E-01

-8.8673E-02

3.1296E-02

-7.5083E-03

2.6155E-03

-7.5209E-04

2.1413E-04

-5.2472E-05

1.1736E-05

S2

5.1354E-01

-5.1664E-02

8.3500E-03

-3.5966E-03

3.4548E-04

-1.3271E-04

2.2599E-05

3.3007E-06

1.6784E-06

S3

-3.8488E-02

-2.1968E-02

2.1517E-03

-6.1564E-05

3.1537E-04

-9.5750E-05

-5.2004E-06

-2.4878E-06

1.7820E-06

S4

1.6385E-02

-1.4229E-04

7.2465E-04

1.7486E-04

9.7360E-05

-5.2600E-06

3.6865E-06

1.1392E-06

-6.0207E-07

S5

-1.2516E-03

-1.0837E-03

1.5499E-04

3.5526E-04

2.9463E-04

1.9229E-04

9.4374E-05

3.4158E-05

4.2718E-06

S6

-4.5073E-02

-2.5336E-03

-1.6900E-03

-3.0719E-04

-1.6995E-04

-5.9617E-05

-3.0706E-05

-4.6104E-06

-3.1579E-06

S7

-2.7712E-01

8.1832E-03

-5.1178E-03

-5.0855E-04

-1.6265E-04

5.3165E-05

8.6201E-07

-6.8110E-06

-2.7643E-06

S8

-2.4260E-01

3.7085E-02

-4.5313E-03

-4.9767E-04

1.9254E-04

1.6044E-04

2.5806E-05

-3.9577E-05

5.2264E-06

S9

-4.0726E-03

1.1025E-02

3.1802E-03

-2.9917E-03

5.5175E-04

1.3644E-05

-2.9447E-05

-6.1779E-05

2.2838E-05

S10

-2.9225E-02

1.0846E-01

-1.1421E-02

7.5186E-03

-4.6636E-03

6.4014E-04

-8.1429E-04

4.2135E-04

-5.1869E-05

TABLE 2

In embodiment 1, the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are non-rotationally symmetric aspheric surfaces (i.e., AAS surfaces), and the surface type of the non-rotationally symmetric aspheric surfaces can be defined by, but is not limited to, the following non-rotationally symmetric aspheric surface formula:

wherein Z is a rise of a plane parallel to the Z-axis direction; c_x、C_yX, Y (curvature is the reciprocal of curvature radius) of the apex of the axial surface; k_x、K_yX, Y axial conic coefficients, respectively; AR, BR, CR, DR, ER, FR, GR, HR, JR are respectively 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th order coefficients in the aspheric surface rotational symmetry component; AP, BP, CP, DP, EP, FP, GP, HP and JP are respectively coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order and 20 th order in the aspheric surface non-rotational symmetric component. Tables 3 and 4 below show the rotationally symmetric components and the higher-order coefficients of the rotationally asymmetric components of the rotationally asymmetric aspherical surfaces S11 and S12, respectively, which can be used in example 1.

TABLE 3

AAS noodle

FR

FP

GR

GP

HR

HP

JR

JP

S11

8.0284E-05

0.0000E+00

-1.0759E-05

0.0000E+00

6.7375E-07

0.0000E+00

-1.6449E-08

0.0000E+00

S12

2.5271E-05

0.0000E+00

-1.6561E-06

0.0000E+00

6.1764E-08

0.0000E+00

-9.9037E-10

0.0000E+00

TABLE 4

Figure 2 shows the RMS spot diameter for the optical imaging system of example 1 at different image height positions in the first quadrant. In FIG. 2, the minimum RMS spot diameter is 0.0014629mm, the maximum RMS spot diameter is 0.027934mm, the mean RMS spot diameter is 0.0028404mm, and the standard deviation of the RMS spot diameter is 0.0024969 mm. As can be seen from fig. 2, the optical imaging system according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging system according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 example, the effective focal length fx of the optical imaging system in the X-axis direction is 1.89mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 1.89mm, the total length TTL of the optical imaging system is 7.27mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 4.50mm, the half Smei-FOV of the maximum field angle of the optical imaging system is 62.5 °, and the ratio f/EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.98.

Table 5 shows a basic parameter table of the optical imaging system of example 2, in which the units of the radius of curvature X, the radius of curvature Y, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows the high-order term coefficients that can be used for each rotationally symmetric aspherical mirror surface in embodiment 2, wherein each rotationally symmetric aspherical mirror surface type can be defined by formula (1) given in embodiment 1 above. Tables 7 and 8 show the rotationally symmetric components and the higher-order coefficients of the rotationally asymmetric components that can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 2, wherein the rotationally asymmetric aspherical surface types can be defined by the formula (2) given in embodiment 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.6135E+00

-1.5419E-01

8.1631E-02

-2.0503E-02

7.7949E-03

-3.8156E-03

1.7168E-04

-4.7048E-04

4.7531E-05

S2

1.0580E+00

-2.8330E-01

2.4755E-02

-3.4824E-03

1.0690E-02

-2.9537E-03

-1.1387E-03

2.1646E-04

1.2659E-04

S3

-7.4684E-02

-4.8570E-02

6.5579E-03

8.0473E-04

7.0394E-04

-8.0096E-04

2.3745E-04

-1.3073E-05

1.0016E-06

S4

3.5758E-02

2.0487E-03

3.1461E-03

1.2490E-03

4.3135E-04

-1.4106E-05

6.2372E-05

-1.3058E-05

-4.0485E-06

S5

-6.4033E-03

-2.1136E-03

-4.1474E-04

-7.5000E-05

-2.5062E-05

-1.6508E-06

-7.5990E-06

-2.0373E-06

-4.5641E-06

S6

-4.3617E-02

-7.3179E-03

-2.8476E-03

-6.8183E-04

-3.0424E-04

-5.9225E-05

-3.1843E-05

-4.7383E-07

-2.8045E-06

S7

-3.4430E-01

2.2070E-02

-9.1496E-03

2.2823E-03

-4.5884E-04

2.7826E-04

-6.3613E-05

8.2463E-05

-3.9203E-05

S8

-2.8337E-01

4.3252E-02

-2.1506E-03

8.8322E-04

3.9057E-04

-1.7045E-04

1.2410E-04

3.2986E-05

-1.2366E-05

S9

-8.8562E-02

1.2519E-02

9.3892E-03

-7.3181E-03

7.4363E-04

-2.8408E-04

3.5787E-04

-2.8516E-05

-7.3039E-05

S10

6.1647E-02

1.1527E-01

-1.3689E-02

8.6000E-03

-1.3505E-02

2.3629E-03

1.8269E-04

7.9342E-04

-3.1632E-04

TABLE 6

TABLE 7

AAS noodle

FR

FP

GR

GP

HR

HP

JR

JP

S11

-9.6307E-04

0.0000E+00

7.6874E-05

0.0000E+00

-3.3759E-06

0.0000E+00

6.6201E-08

0.0000E+00

S12

3.9932E-05

0.0000E+00

-2.4609E-06

0.0000E+00

8.9093E-08

0.0000E+00

-1.4345E-09

0.0000E+00

TABLE 8

Figure 4 shows the RMS spot diameter for the optical imaging system of example 2 at different image height positions in the first quadrant. In FIG. 4, the minimum RMS spot diameter is 0.00079943mm, the maximum RMS spot diameter is 0.040623mm, the mean RMS spot diameter is 0.0048563mm, and the standard deviation of the RMS spot diameter is 0.0038687 mm. As can be seen from fig. 4, the optical imaging system according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6. Fig. 5 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 example, the effective focal length fx of the optical imaging system in the X-axis direction is 2.38mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.38mm, the total length TTL of the optical imaging system is 7.27mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 4.50mm, the half Smei-FOV of the maximum field angle of the optical imaging system is 62.5 °, and the ratio f/EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.05.

Table 9 shows a basic parameter table of the optical imaging system of example 3, in which the units of the radius of curvature X, the radius of curvature Y, the thickness/distance, and the focal length are all millimeters (mm). Table 10 shows the high-order term coefficients that can be used for each rotationally symmetric aspherical mirror surface in embodiment 3, wherein each rotationally symmetric aspherical mirror surface type can be defined by formula (1) given in embodiment 1 above. Tables 11 and 12 show the rotationally symmetric components and the higher-order coefficients of the rotationally asymmetric components that can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 3, in which the rotationally asymmetric aspherical surface types can be defined by the formula (2) given in embodiment 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.5766E+00

-1.1861E-01

8.2514E-02

-1.6903E-02

7.5153E-03

-2.3992E-03

1.3857E-03

-1.3029E-04

2.2820E-04

S2

8.2157E-01

-1.5089E-01

1.1840E-02

-7.6187E-03

3.5298E-03

6.8634E-04

5.2838E-04

-1.0268E-04

-9.2307E-05

S3

-1.1333E-01

-3.9739E-02

6.7748E-03

9.4444E-04

-1.2831E-04

-3.8814E-04

9.0005E-05

-1.2325E-05

1.7337E-05

S4

4.6659E-02

4.0311E-03

4.2149E-03

1.6085E-03

5.8478E-04

1.2630E-04

6.9687E-05

-2.4699E-07

2.5458E-06

S5

-1.6872E-03

-1.1373E-03

-1.7736E-04

-8.8087E-06

1.8333E-05

2.0361E-05

1.4019E-05

7.9895E-06

1.7257E-06

S6

-2.8947E-02

-1.1395E-03

-6.2643E-04

-1.2638E-05

-3.2190E-05

4.9098E-06

-6.0267E-06

1.2062E-06

-7.0349E-07

S7

-2.3810E-01

7.8955E-03

-4.3962E-03

1.4192E-05

-1.9874E-04

5.2649E-05

-4.6162E-06

9.5248E-06

-2.7441E-06

S8

-2.6315E-01

4.1185E-02

-3.5750E-03

-2.7024E-04

2.6338E-04

1.3002E-04

5.5356E-05

-3.2675E-05

-1.7934E-06

S9

-7.6597E-02

2.2143E-02

2.9411E-03

-5.2274E-03

1.1141E-03

-3.0711E-04

1.0380E-04

-1.0333E-04

4.6309E-05

S10

7.0987E-02

1.3384E-01

-1.8912E-02

2.6962E-03

-9.6756E-03

1.1996E-03

7.9571E-05

1.0046E-03

-3.6601E-04

Watch 10

TABLE 11

AAS noodle

FR

FP

GR

GP

HR

HP

JR

JP

S11

-2.1917E-05

0.0000E+00

-8.3861E-06

0.0000E+00

8.9354E-07

0.0000E+00

-2.7846E-08

0.0000E+00

S12

2.4905E-05

0.0000E+00

-1.5508E-06

0.0000E+00

5.6791E-08

0.0000E+00

-9.1619E-10

0.0000E+00

TABLE 12

Figure 6 shows the RMS spot diameter for the optical imaging system of example 3 at different image height positions in the first quadrant. In FIG. 6, the minimum RMS spot diameter is 0.0012555mm, the maximum RMS spot diameter is 0.087135mm, the mean RMS spot diameter is 0.0037604mm, and the standard deviation of the RMS spot diameter is 0.0085364 mm. As can be seen from fig. 6, the optical imaging system according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8. Fig. 7 shows a schematic structural diagram of an optical imaging system according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 example, the effective focal length fx of the optical imaging system in the X-axis direction is 1.99mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 1.98mm, the total length TTL of the optical imaging system is 7.27mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 4.50mm, the half Smei-FOV of the maximum field angle of the optical imaging system is 62.5 °, and the ratio f/EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 2.18.

Table 13 shows a basic parameter table of the optical imaging system of example 4, in which the units of the radius of curvature X, the radius of curvature Y, the thickness/distance, and the focal length are all millimeters (mm). Table 14 shows the high-order term coefficients that can be used for each rotationally symmetric aspherical mirror surface in example 4, wherein each rotationally symmetric aspherical mirror surface type can be defined by formula (1) given in example 1 above. Tables 15 and 16 show the rotationally symmetric components and the higher-order coefficients of the rotationally asymmetric components that can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 4, in which the rotationally asymmetric aspherical surface types can be defined by the formula (2) given in embodiment 1 above.

Watch 13

TABLE 14

Watch 15

AAS noodle

FR

FP

GR

GP

HR

HP

JR

JP

S11

-7.7608E-05

0.0000E+00

-2.8563E-06

0.0000E+00

5.5221E-07

0.0000E+00

-1.8543E-08

0.0000E+00

S12

-5.3092E-06

0.0000E+00

4.1825E-07

0.0000E+00

-1.4169E-08

0.0000E+00

1.7103E-10

0.0000E+00

TABLE 16

Figure 8 shows the RMS spot diameter for the optical imaging system of example 4 at different image height positions in the first quadrant. In FIG. 8, the minimum RMS spot diameter is 0.0011349mm, the maximum RMS spot diameter is 0.080675mm, the mean RMS spot diameter is 0.0039047mm, and the standard deviation of the RMS spot diameter is 0.0074432 mm. As can be seen from fig. 8, the optical imaging system according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10. Fig. 9 shows a schematic structural diagram of an optical imaging system according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 example, the effective focal length fx of the optical imaging system in the X-axis direction is 2.49mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.49mm, the total length TTL of the optical imaging system is 7.27mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 4.50mm, the half Smei-FOV of the maximum field angle of the optical imaging system is 62.5 °, and the ratio f/EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.12.

Table 17 shows a basic parameter table of the optical imaging system of example 5 in which the units of the radius of curvature X, the radius of curvature Y, the thickness/distance, and the focal length are all millimeters (mm). Table 18 shows the high-order term coefficients that can be used for each rotationally symmetric aspherical mirror surface in example 5, wherein each rotationally symmetric aspherical mirror surface type can be defined by formula (1) given in example 1 above. Tables 19 and 20 show the rotationally symmetric components and the higher-order coefficients of the rotationally asymmetric components that can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 5, in which the rotationally asymmetric aspherical surface types can be defined by the formula (2) given in embodiment 1 above. .

TABLE 17

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

8.4396E-01

-9.1753E-02

3.1249E-02

-7.6379E-03

2.5202E-03

-7.3738E-04

2.0030E-04

-4.3867E-05

5.5406E-06

S2

5.0730E-01

-5.6586E-02

8.4283E-03

-3.5721E-03

4.0227E-04

-1.0443E-04

3.1347E-05

1.2626E-05

-4.2239E-06

S3

-3.6248E-02

-2.1979E-02

1.4157E-03

-7.9776E-05

3.5022E-04

-7.7433E-05

-7.5911E-06

-4.5700E-07

6.9214E-07

S4

1.9628E-02

-4.5359E-04

3.8313E-04

9.1082E-05

9.5694E-05

-9.6029E-06

2.2598E-06

1.9227E-06

-5.8619E-07

S5

-3.1521E-03

-1.7911E-03

-2.9311E-04

-3.4508E-06

2.0687E-05

1.1753E-05

-4.1358E-06

-5.7926E-06

-5.6113E-06

S6

-4.7310E-02

-3.3508E-03

-1.5985E-03

-1.5825E-04

-5.8797E-05

2.8367E-05

1.6161E-05

1.6802E-05

3.2239E-06

S7

-3.0135E-01

1.1993E-02

-5.2326E-03

-6.0989E-05

-2.7488E-04

7.9296E-05

-8.3281E-06

9.9829E-06

-4.8121E-06

S8

-2.5066E-01

3.8261E-02

-3.5715E-03

-6.8667E-04

2.9820E-04

1.3751E-04

3.9717E-05

-3.8504E-05

-2.9277E-07

S9

7.7694E-03

8.3848E-03

4.3762E-03

-3.1826E-03

4.8748E-04

6.2775E-05

-6.7106E-05

-3.1120E-05

1.0412E-05

S10

-1.3404E-02

1.0636E-01

-1.1298E-02

7.5571E-03

-4.4809E-03

6.1949E-04

-8.2680E-04

4.3809E-04

-5.9831E-05

Watch 18

Watch 19

AAS noodle

FR

FP

GR

GP

HR

HP

JR

JP

S11

9.6788E-05

0.0000E+00

-1.4388E-05

0.0000E+00

9.5181E-07

0.0000E+00

-2.4105E-08

0.0000E+00

S12

2.4729E-05

0.0000E+00

-1.5702E-06

0.0000E+00

5.7364E-08

0.0000E+00

-9.0940E-10

0.0000E+00

Watch 20

Figure 10 shows the RMS spot diameter for the optical imaging system of example 5 at different image height positions in the first quadrant. In FIG. 10, the minimum RMS spot diameter is 0.0016193mm, the maximum RMS spot diameter is 0.042821mm, the mean RMS spot diameter is 0.0031118mm, and the standard deviation of the RMS spot diameter is 0.0042336 mm. As can be seen from fig. 10, the optical imaging system according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 example, the effective focal length fx of the optical imaging system in the X-axis direction is 2.21mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.20mm, the total length TTL of the optical imaging system is 7.27mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 4.50mm, the half Smei-FOV of the maximum field angle of the optical imaging system is 62.5 °, and the ratio f/EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 2.20.

Table 21 shows a basic parameter table of the optical imaging system of example 6, in which the units of the radius of curvature X, the radius of curvature Y, the thickness/distance, and the focal length are all millimeters (mm). Table 22 shows the high-order term coefficients that can be used for each rotationally symmetric aspherical mirror surface in embodiment 6, wherein each rotationally symmetric aspherical mirror surface type can be defined by formula (1) given in embodiment 1 above. Tables 23, 24 show the rotationally symmetric components of the rotationally asymmetric aspherical surfaces S11 and S12 and the higher-order coefficients of the rotationally asymmetric components that can be used in embodiment 6, wherein the rotationally asymmetric aspherical surface type can be defined by formula (2) given in embodiment 1 above.

TABLE 21

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.5438E+00

-1.5326E-01

7.7457E-02

-1.5931E-02

7.1109E-03

-2.6556E-03

9.2834E-04

-2.3471E-04

1.0446E-04

S2

9.7001E-01

-1.6174E-01

1.5124E-02

-7.4236E-03

2.7318E-03

-4.9748E-04

1.2701E-04

9.8698E-06

-1.4183E-05

S3

-4.9824E-02

-4.8170E-02

5.9930E-03

-2.0253E-04

1.8114E-04

-4.4786E-04

2.1184E-04

-3.1929E-05

1.2521E-05

S4

5.3213E-02

2.1288E-03

2.5640E-03

5.4976E-04

2.5791E-04

-3.4178E-05

5.0388E-05

-7.8397E-06

3.2705E-06

S5

-4.8534E-03

-1.5469E-03

-2.4204E-04

-2.8288E-05

-3.0369E-06

5.3957E-06

1.9512E-06

2.6532E-06

2.6276E-07

S6

-3.7429E-02

-4.4049E-03

-1.6687E-03

-2.5360E-04

-1.0601E-04

-7.3589E-06

-6.4013E-06

3.3167E-06

-1.2437E-06

S7

-2.8396E-01

1.8820E-02

-6.2723E-03

9.5942E-04

7.8552E-05

1.9034E-04

6.8135E-06

2.1827E-05

-5.0438E-06

S8

-2.4846E-01

4.6006E-02

-4.0040E-03

5.8478E-05

7.8834E-04

1.5913E-04

-2.1871E-05

-1.0072E-05

5.2014E-06

S9

-3.5848E-02

3.8223E-03

7.3116E-03

-7.1555E-03

1.9087E-03

-2.8035E-04

-1.3393E-04

5.4589E-05

1.9788E-06

S10

1.1698E-02

1.1998E-01

-2.0071E-02

6.6406E-03

-8.8955E-03

1.1770E-03

-2.0020E-04

6.0152E-04

-1.8409E-04

TABLE 22

TABLE 23

AAS noodle

FR

FP

GR

GP

HR

HP

JR

JP

S11

4.0438E-04

0.0000E+00

-5.3199E-05

0.0000E+00

3.4419E-06

0.0000E+00

-8.8604E-08

0.0000E+00

S12

2.7150E-06

0.0000E+00

-2.4113E-07

0.0000E+00

1.2752E-08

0.0000E+00

-2.6864E-10

0.0000E+00

Watch 24

Figure 12 shows the RMS spot diameter for the optical imaging system of example 6 at different image height positions in the first quadrant. In FIG. 12, the minimum RMS spot diameter is 0.0011461mm, the maximum RMS spot diameter is 0.033787mm, the mean RMS spot diameter is 0.0036208mm, and the standard deviation of the RMS spot diameter is 0.0035952 mm. As can be seen from fig. 12, the optical imaging system according to embodiment 6 can achieve good imaging quality.

In summary, examples 1 to 6 each satisfy the relationship shown in table 25.

TABLE 25

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (39)

1. The optical imaging system, in order from an object side to an image side along an optical axis, comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens having optical power, and an aspherical surface having non-rotational symmetry with respect to at least one mirror surface of an object side surface of the first lens to an image side surface of the sixth lens, the optical imaging system having an X-axis direction and a Y-axis direction perpendicular to each other on a plane perpendicular to the optical axis;

wherein, in the Y-axis direction, half ImgH of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system and half Semi-FOV of a maximum field angle of the optical imaging system satisfy the following conditional expression:

ImgH＞4mm；

Semi-FOV＞60°。

2. the optical imaging system of claim 1, wherein the effective focal length fx of the X-axis direction and the effective focal length f3 of the third lens satisfy: fx/f3 is more than 0.5 and less than 1.0.

3. The optical imaging system of claim 1, wherein the effective focal length fy in the Y-axis direction and the effective focal length f5 of the fifth lens satisfy: fy/f5 is more than 0.5 and less than 1.0.

4. The optical imaging system of claim 1, wherein in the Y-axis direction, a maximum effective radius DT11 of an object-side surface of the first lens and a maximum effective radius DT61 of an object-side surface of the sixth lens satisfy: 0.7 < DT11/DT61 < 1.2.

5. The optical imaging system of claim 1, wherein in the Y-axis direction, the edge thickness ET4 of the fourth lens and the edge thickness ET6 of the sixth lens satisfy: 0.5 < ET4/ET6 < 1.0.

6. The optical imaging system of claim 1, wherein in the Y-axis direction, the first lens edge thickness ET1 and the third lens edge thickness ET3 satisfy: 0.5 < ET1/ET3 < 1.0.

7. The optical imaging system according to claim 1, wherein, in the Y-axis direction, a distance SAG11 on the optical axis from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens to an intersection point of an image-side surface of the first lens and the optical axis to a distance SAG12 on the optical axis from an effective radius vertex of the image-side surface of the first lens to the optical axis satisfies: 0.5 < SAG12/SAG11 < 1.0.

8. The optical imaging system according to claim 1, wherein, in the Y-axis direction, a distance SAG52 on the optical axis from an intersection point of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens and a center thickness CT5 on the optical axis of the fifth lens satisfy: -1.0 < SAG52/CT5 < -0.5.

9. The optical imaging system of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: f4/f1 is more than 0.3 and less than 1.3.

10. The optical imaging system of claim 1, wherein a radius of curvature R1 of the object side surface of the first lens and an effective focal length f1 of the first lens satisfy: r1/f1 is more than 0.5 and less than 1.0.

11. The optical imaging system of claim 1, wherein in the Y-axis direction, a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy: 0.4 < R3/(R3+ R4) < 1.0.

12. The optical imaging system of claim 1, wherein in the Y-axis direction, a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy: -1.0 < R6/R5 < -0.5.

13. The optical imaging system of claim 1, wherein in the Y-axis direction, a radius of curvature R8 of an image-side surface of the fourth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: -1.0 < R10/R8 < -0.3.

14. The optical imaging system of claim 1, wherein in the Y-axis direction, a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R12 of an image-side surface of the sixth lens satisfy: 0.5 < R12/R11 < 1.5.

15. The optical imaging system of claim 1, wherein a sum Σ AT of a center thickness CT1 of the first lens on the optical axis and a separation distance on the optical axis of any two adjacent lenses of the first lens to the sixth lens satisfies: 0.2 < CT 1/Sigma AT < 0.7.

16. The optical imaging system of claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis and a maximum effective radius DT52 of an image side surface of the fifth lens satisfy: 0.2 < CT5/DT52 < 0.7.

17. The optical imaging system of claim 1, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.2 < CT4/CT3 < 0.7.

18. The optical imaging system of claim 1, wherein a center thickness CT2 of the second lens on the optical axis is separated from the second and third lenses on the optical axis by a distance T23 that satisfies: 0.3 < CT2/T23 < 0.8.

19. The optical imaging system of any of claims 1-18, wherein the object side surface of the first lens is concave.

20. The optical imaging system of any of claims 1 to 18, wherein the second lens has a convex object-side surface and a concave image-side surface.

21. The optical imaging system of any of claims 1-18, wherein the fourth lens has a negative optical power and a concave image-side surface.

22. The optical imaging system of any of claims 1-18, wherein the fifth lens has a positive optical power and a convex image-side surface.

23. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:

a first lens having a refractive power, an object side surface of which is concave;

a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave;

a third lens having optical power;

a fourth lens having a negative refractive power, an image-side surface of which is concave; and

the image side surface of the fifth lens is a convex surface;

a sixth lens having optical power;

at least one mirror surface of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical surface that is not rotationally symmetric, and the optical imaging system has an X-axis direction and a Y-axis direction that are perpendicular to each other on a plane perpendicular to the optical axis, wherein:

the effective focal length fx of the X-axis direction and the effective focal length f3 of the third lens satisfy: fx/f3 is more than 0.5 and less than 1.0.

24. The optical imaging system of claim 23, wherein the effective focal length fy in the Y-axis direction and the effective focal length f5 of the fifth lens satisfy: fy/f5 is more than 0.5 and less than 1.0.

25. The optical imaging system of claim 23, wherein in the Y-axis direction, a maximum effective radius DT11 of an object-side surface of the first lens and a maximum effective radius DT61 of an object-side surface of the sixth lens satisfy: 0.7 < DT11/DT61 < 1.2.

26. The optical imaging system of claim 23, wherein in the Y-axis direction, the edge thickness ET4 of the fourth lens and the edge thickness ET6 of the sixth lens satisfy: 0.5 < ET4/ET6 < 1.0.

27. The optical imaging system of claim 23, wherein in the Y-axis direction, the first lens edge thickness ET1 and the third lens edge thickness ET3 satisfy: 0.5 < ET1/ET3 < 1.0.

28. The optical imaging system of claim 23, wherein in the Y-axis direction, a distance SAG11 on the optical axis from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens to an intersection point of an image-side surface of the first lens and the optical axis to a distance SAG12 on the optical axis from an effective radius vertex of the image-side surface of the first lens to the optical axis satisfies: 0.5 < SAG12/SAG11 < 1.0.

29. The optical imaging system of claim 23, wherein in the Y-axis direction, a distance SAG52 on the optical axis from an intersection point of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy: -1.0 < SAG52/CT5 < -0.5.

30. The optical imaging system of claim 23, wherein the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: f4/f1 is more than 0.3 and less than 1.3.

31. The optical imaging system of claim 23, wherein a radius of curvature R1 of the object side surface of the first lens and an effective focal length f1 of the first lens satisfy: r1/f1 is more than 0.5 and less than 1.0.

32. The optical imaging system of claim 23, wherein in the Y-axis direction, a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy: 0.4 < R3/(R3+ R4) < 1.0.

33. The optical imaging system of claim 23, wherein in the Y-axis direction, a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy: -1.0 < R6/R5 < -0.5.

34. The optical imaging system of claim 23, wherein in the Y-axis direction, a radius of curvature R8 of an image-side surface of the fourth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: -1.0 < R10/R8 < -0.3.

35. The optical imaging system of claim 23, wherein in the Y-axis direction, a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R12 of an image-side surface of the sixth lens satisfy: 0.5 < R12/R11 < 1.5.

36. The optical imaging system of claim 23, wherein, in the Y-axis direction, a sum Σ AT of a center thickness CT1 of the first lens on the optical axis and a separation distance Σ AT of any two adjacent lenses of the first lens to the sixth lens on the optical axis satisfies: 0.2 < CT 1/Sigma AT < 0.7.

37. The optical imaging system of claim 23, wherein, in the Y-axis direction, a center thickness CT5 of the fifth lens on the optical axis and a maximum effective radius DT52 of an image-side surface of the fifth lens satisfy: 0.2 < CT5/DT52 < 0.7.

38. The optical imaging system of claim 23, wherein in the Y-axis direction, a central thickness CT3 of the third lens on the optical axis and a central thickness CT4 of the fourth lens on the optical axis satisfy: 0.2 < CT4/CT3 < 0.7.

39. The optical imaging system of claim 23, wherein a center thickness CT2 of the second lens on the optical axis and a separation distance T23 of the second lens and the third lens on the optical axis in the Y-axis direction satisfy: 0.3 < CT2/T23 < 0.8.

Images