CN212694143U

CN212694143U - Image lens group and smart phone

Info

Publication number: CN212694143U
Application number: CN202021784792.3U
Authority: CN
Inventors: 魏崇渝; 曾昱泰; 陈纬彧
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2020-07-30
Filing date: 2020-08-24
Publication date: 2021-03-12
Anticipated expiration: 2030-08-24
Also published as: TWM602642U

Abstract

The utility model discloses an image mirror group and smart mobile phone, wherein, image mirror group contains a wavefront coding element, an iris diaphragm and multi-disc lens. The wavefront coding element and the diaphragm are arranged on one side of the lenses, and no lens is arranged between the wavefront coding element and the diaphragm. The lenses respectively have an object side surface facing a subject and an image side surface facing an imaging plane, and the lenses include a first lens closest to the subject and a last lens closest to the imaging plane. The total number of the plurality of lenses is at least four. At least half of the lenses are made of plastic. At least one lens surface of the multi-lens has at least one critical point. When specific conditions are met, the image mirror group can meet the requirements of miniaturization and high imaging quality at the same time, and the smart phone is provided with the image mirror group.

Description

Image lens group and smart phone

Technical Field

The utility model relates to an image mirror group and smart mobile phone, especially an image mirror group suitable for smart mobile phone.

Background

As the performance of the electronic photosensitive device is improved with the advance of semiconductor process technology, the pixel can reach a smaller size, and thus, the optical lens with high imaging quality is an indispensable factor.

With the technology changing day by day, the smart phone equipped with the optical lens has a wider application range and more diversified requirements for the optical lens, so as to meet various situation requirements of the consumer such as large viewing angle, close-up shooting and long-distance shooting.

Generally, in situations such as close-up shooting and far-up shooting, the fixed-focus optical lens mounted in most mobile devices cannot be compensated by the back-end image processing program because the defocus distance is too long. Therefore, the optical lens is usually matched with a Voice Coil Motor (VCM) to achieve Auto-Focus (Auto-Focus) and further adjust the back Focus to improve the imaging quality.

However, the mounting of the voice coil motor is disadvantageous for the miniaturization of the optical lens, and even if the optical lens is mounted with a relatively large photosensitive element and a conventional rear-end image processing program is applied, it is still impossible to provide good image quality in each angle of view, particularly in the 0.3 to 0.5 times image height region.

Therefore, this novel optical lens promotes the focal depth of camera lens through collocation wavefront coding component, lets originally become comparatively clear because of out of focus too far leads to unable modified image, and then lets image processing can restore into clear image to do benefit to camera module's miniaturization, and can compensate the module that has adjustment back focal length function, the shortcoming that the imaging quality is not enough under specific visual angle.

SUMMERY OF THE UTILITY MODEL

The utility model provides an image mirror group and smart mobile phone. The image lens group comprises a wavefront coding element, an aperture and a plurality of lenses. When satisfying specific conditions, this novel image mirror group that provides can satisfy the demand of miniaturization and high image quality simultaneously.

The utility model provides an image mirror group, which comprises a wavefront coding element, a diaphragm and a plurality of lenses. The wavefront coding element and the aperture are both arranged on one side of the lenses, and no lens is arranged between the wavefront coding element and the aperture. The lenses respectively have an object side surface facing a subject and an image side surface facing an imaging plane, and include a first lens closest to the subject and a last lens closest to the imaging plane. The total number of lenses is at least four. At least half of the lenses are made of plastic. At least one lens surface of the multi-piece lens has at least one critical point. An axial distance between the object-side surface of the first lens element and the image plane is TL, a maximum imaging height of the image lens assembly is ImgH, an axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, and an entrance pupil aperture of the image lens assembly is EPD, wherein the following conditions are satisfied:

TL/ImgH < 3.0; and

Td/EPD<6.0。

the present invention further provides an image lens assembly, which comprises a wavefront coding element, an aperture and a plurality of lenses. The wavefront coding element and the aperture are both arranged on one side of the lenses, and no lens is arranged between the wavefront coding element and the aperture. The lenses respectively have an object side surface facing a subject and an image side surface facing an imaging plane, and include a first lens closest to the subject and a last lens closest to the imaging plane. The wavefront coding element is made of plastic. The wavefront coding element is provided with a wavefront coding surface, and the wavefront coding surface is in a non-axisymmetric shape. The axial thickness of the wavefront coding element is CT _ WFCC, the axial distance between the object-side surface of the first lens element and the image plane is TL, the maximum imaging height of the image lens assembly is ImgH, the axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, and the entrance pupil diameter of the image lens assembly is EPD, which satisfies the following conditions:

CT _ WFCC <0.35[ mm ];

TL/ImgH < 3.0; and

Td/EPD<6.0。

the utility model provides a smart mobile phone, it contains aforementioned image mirror group, electron photosensitive element and image processor, and wherein electron photosensitive element sets up on the image plane of image mirror group, and image processor electric connection is in electron photosensitive element.

When TL/ImgH satisfies the above condition, it helps to ensure that the image lens assembly can achieve a proper balance between miniaturization and module manufacturability.

When the Td/EPD satisfies the above condition, it can be ensured that the amount of light incidence is sufficient, so that image noise is relatively low, and the image after the image restoration processing can be undistorted.

When the CT _ WFCC satisfies the above condition, it is helpful to control the size and thickness of the wavefront coding element, so as to further improve the overall space utilization efficiency.

The above description of the present invention and the following description of the embodiments are provided to illustrate and explain the spirit and principles of the present invention and to provide further explanation of the claims of the present invention.

Drawings

Fig. 1 is a schematic view of an image capturing device according to a first embodiment of the present invention.

Fig. 2 is a graph of spherical aberration and astigmatism for a first embodiment of a wavefront coded surface employing a free-form surface set forth in XY multiples, in order from left to right.

Fig. 3 is a plot of spherical aberration and astigmatism, in order from left to right, for a first embodiment of a wavefront-encoded surface employing a free-form surface set forth in zernike terms.

Fig. 4 is a schematic view of an image capturing device according to a second embodiment of the present invention.

Fig. 5 is a plot of spherical aberration and astigmatism for a second embodiment of a wavefront coded surface employing a free-form surface set forth in XY multiples, in order from left to right.

Fig. 6 is a plot of spherical aberration and astigmatism, in order from left to right, for a second embodiment of a wavefront-encoded surface employing a free-form surface set forth in zernike terms.

Fig. 7 is a schematic view of an image capturing device according to a third embodiment of the present invention.

Fig. 8 is a graph of spherical aberration and astigmatism for a third embodiment of a wavefront coded surface employing a free-form surface set forth in XY multiples, in order from left to right.

Fig. 9 is a plot of spherical aberration and astigmatism, in order from left to right, for a third embodiment of a wavefront-encoded surface employing a free-form surface set forth in zernike terms.

Fig. 10 is a schematic view of an image capturing device according to a fourth embodiment of the present invention.

Fig. 11 is a graph of spherical aberration and astigmatism for a fourth embodiment of a wavefront coded surface employing a free-form surface set forth in XY multiples, in order from left to right.

Fig. 12 is a plot of spherical aberration and astigmatism, in order from left to right, for a fourth embodiment of a wavefront-encoded surface employing a free-form surface set forth in zernike terms.

Fig. 13 is a schematic perspective view illustrating an image capturing device according to a fifth embodiment of the present invention.

Fig. 14 is a schematic perspective view illustrating a side of a smart phone according to a sixth embodiment of the present invention.

Fig. 15 is a perspective view of the other side of the smartphone of fig. 14.

Fig. 16 is a system block diagram of the smart phone of fig. 14.

Fig. 17 is a schematic perspective view illustrating a side of a smart phone according to a seventh embodiment of the present invention.

FIG. 18 is a diagram illustrating the parameter Y11 and the critical point of a portion of the lens according to the first embodiment of the present invention.

FIG. 19 is a schematic view of an imaging area and parameters ImgHX, ImgHY and ImgH of a sensing region of an electronic photosensitive device according to an embodiment of the present invention.

FIG. 20 is a schematic front view of a wavefront coding device on a wavefront coding surface according to an embodiment of the present invention.

FIG. 21 is a schematic diagram of a side view of the parameter Δ DSag and the wavefront coding device along a diagonal direction according to an embodiment of the present invention.

FIG. 22A is a schematic diagram of an imaging path without a wavefront coding element in the prior art.

FIG. 22B is a schematic diagram illustrating an imaging path with wavefront coding elements arranged according to an embodiment of the present invention.

FIG. 23 is a schematic diagram illustrating an imaging process flow of a wavefront coding device according to an embodiment of the present invention.

FIG. 24A is a schematic diagram illustrating an imaging effect of a conventional apparatus without a wavefront coding device.

FIG. 24B is a schematic diagram illustrating the imaging effect of the wavefront coding device according to one embodiment of the present invention.

FIG. 25 is a schematic view of an arrangement of optical path turning elements in an image lens assembly according to the present invention.

FIG. 26 is a schematic view illustrating another arrangement of optical path turning elements in an image lens assembly according to the present invention.

FIG. 27 is a schematic view showing an arrangement relationship of two optical path turning elements in an image lens assembly according to the present invention.

Reference numerals:

10. 10a, 10b … image capturing device

11 … imaging lens

13 … electronic photosensitive element

14 … image stabilization module

20. 30 … smart phone

21 … flash lamp module

23 … image processor

23a … Fourier transform module

24 … user interface

25 … image software processor

26 … photographic subject

37 … extended image signal processor

Critical point of C …

IM … imaging surface

OA1 … first optical axis

OA2 … second optical axis

OA3 … third optical axis

LF … light path turning element

LF1 … first light path turning element

LF2 … second light path turning element

LG … lens group

Wavefront coding elements WFCC, WFCC _1, WFCC _2, WFCC _3, WFCC _4 …

WFCCS _1, WFCCS _2, WFCCS _3, WFCCS _4 … wavefront coding surface

AS, 100, 200, 300, 400 … diaphragm

101. 102, 103, 201, 301, 302, 401, 402 … diaphragm

110. 210, 310, 410 … first lens

111. 211, 311, 411 … object side surface

112. 212, 312, 412 … image side surface

120. 220, 320, 420 … second lens

121. 221, 321, 421 … object side surface

122. 222, 322, 422 … image side surface

130. 230, 330, 430 … third lens

131. 231, 331, 431 … object side surface

132. 232, 332, 432 … image side surface

140. 240, 340, 440 … fourth lens

141. 241, 341, 441 … object side surface

142. 242, 342, 442 … image side surface

150. 250, 350, 450 … fifth lens

151. 251, 351, 451 … object side surface

152. 252, 352, 452 … image side surface

160. 360, 460 … sixth lens

161. 361,461, 461 … object side surface

162. 362, 462 … image side surface

170. 470 … seventh lens

171. 471 … object side surface

172. 472 … image side surface

180 … eighth lens

181 … object side surface

182 image side surface 182 …

190. 290, 390, 490 … infrared ray filtering filter element

195. 295, 395, 495 … imaging plane

199. 299, 399, 499 … electronic photosensitive element

Δ DSag … maximum distance parallel to optical axis between two points opposing each other in diagonal direction within optically effective range of wavefront coding surface

Maximum image height of ImgH … image mirror set (maximum distance between image position and optical axis of image mirror set in diagonal direction of sensing area corresponding to electronic photosensitive element)

The ImgHX … image mirror group corresponds to the maximum distance between the imaging position and the optical axis in the long side direction of the sensing region of the electronic photosensitive element

The ImgHY … image mirror group corresponds to the maximum distance between the imaging position and the optical axis in the short side direction of the sensing region of the electronic photosensitive element

Maximum effective radius of object-side surface of the first lens of Y11 …

X … X-axis direction

Y … Y-axis direction

Z … Z axis direction

D … corresponds to the diagonal direction of the sensing region of the electronic photosensitive element

Detailed Description

The image lens group comprises a wavefront coding element, an aperture and a plurality of lenses. The wavefront coding element is adjacent to the aperture and arranged on the same side of the lenses; therefore, each visual field can be ensured to synchronously carry out phase modulation. Referring to fig. 22A and 22B, fig. 22A is a schematic diagram illustrating an imaging path without a wavefront coding device in the prior art, and fig. 22B is a schematic diagram illustrating an imaging path with a wavefront coding device in an embodiment of the present invention. It can be seen from fig. 22B that a wavefront coding element WFCC is disposed adjacent to the aperture AS, and both the wavefront coding element WFCC and the aperture AS are disposed on the same side of the lens group LG. In contrast to the prior art of fig. 22A without the wavefront coding element, the arrangement of the wavefront coding element WFCC in fig. 22B allows all fields to be modulated synchronously (Phase Modulation). Although the wavefront coding element WFCC may sacrifice part of the Dynamic Range (Dynamic Range), it can be exchanged for a longer depth of field, and the captured signal can be restored to a clear image through a Deconvolution (Deconvolution) process. Wherein the wavefront coding element may also be arranged on the optical ring. The optical effective range of the wavefront coding element can be substantially rectangular to correspond to the electronic photosensitive element with a rectangular effective sensing area. Referring to fig. 20, a front view of a wavefront coding element WFCC with a rectangular optical effective range according to an embodiment of the present invention is shown. The substantially rectangular shape means that the wavefront coding element WFCC has a rectangular shape when viewed from the object side or the image side along the optical axis, but the object side surface or the image side surface thereof may be a non-flat free-form surface, which will be described in detail below.

The wavefront coding element may be plastic; thereby, the degree of change of the surface of the wavefront coding element is facilitated to be increased. Specifically, the Wavefront Coding element may have a Wavefront Coding Surface (Wavefront Coding Surface) facing the aperture such that the Wavefront Coding Surface is close to the aperture, and the Wavefront Coding Surface is non-axisymmetric with respect to the optical axis to extend the depth of field of the entire shot. Wherein, the wavefront coding surface faces the aperture, and the wavefront coding surface faces the aperture and is adjacent to the aperture. Wherein the wavefront coding surface can be a free-form surface stated by XY multiple times. The wavefront coding surface may also be a free-form surface set forth in terms of Zernike (Zernike) terms. The different free-form surface descriptions can provide high image conversion efficiency or better image conversion quality according to requirements.

There is no lens between the wavefront coding element and the aperture. Specifically, the image lens assembly includes a wavefront coding element, an aperture and a plurality of lenses in order from an object side to an image side along an optical path. The lenses respectively have an object side surface facing a subject and an image side surface facing an imaging plane, and the lenses include a first lens closest to the subject and a last lens closest to the imaging plane. The total number of the plurality of lenses may be at least four. The total number of the lenses can be five to nine, so as to meet the specification requirements of different lens sizes and imaging qualities. When the image lens assembly includes four lens elements, the image lens assembly includes a wavefront coding element, an aperture stop, a first lens element, a second lens element, a third lens element and a fourth lens element in sequence from an object side to an image side along an optical path, wherein the fourth lens element closest to an image plane is a last lens element. And so on, when the image lens group includes five lenses, the fifth lens element closest to the image plane is the last lens element. When the image lens assembly includes six lenses, the sixth lens element closest to the image plane is the last lens element. When the image lens assembly includes seven lenses, the seventh lens element closest to the image plane is the last lens element. When the image lens assembly includes eight lens elements, the eighth lens element closest to the image plane is the last lens element. When the image lens assembly includes nine lenses, the ninth lens element closest to the image plane is the last lens element.

The surface of the image side of the last lens at the position close to the optical axis can be a concave surface; therefore, the back focal length can be shortened, and the requirement of miniaturization can be met. The surface of the image side of the last lens can be an aspheric surface; therefore, the lens has enough design freedom degree on the specification of the lens surface so as to successfully meet the requirements on various design specifications such as controlling the size of the lens.

At least one of the object-side surface and the image-side surface of at least one of the plurality of lenses may have at least one critical point; therefore, the lens is beneficial to adjusting the refractive power of the lens and correcting the off-axis aberration. Wherein the image-side surface of the last lens element has at least one convex critical point at the off-axis position; therefore, the optical lens is beneficial to converging off-axis light paths and reducing the effective radius of the final lens so as to further control the volume of the image lens group, and further is configured in more smart phones or devices with more severe space limitation. Fig. 18 is a schematic diagram illustrating a critical point C of the second lens element object-side surface 121, the third lens element object-side surface 131, the fourth lens element image-side surface 142, the fifth lens element object-side surface 151, the fifth lens element image-side surface 152, the sixth lens element object-side surface 161, the sixth lens element image-side surface 162, the seventh lens element object-side surface 171, the seventh lens element image-side surface 172, the eighth lens element object-side surface 181, and the eighth lens element image-side surface 182 according to the first embodiment of the present invention. Fig. 18 shows a critical point of the second lens element in the first embodiment, the object-side surface, the third lens element in the first embodiment, the fourth lens element in the second embodiment, the fifth lens element in the first embodiment, the sixth lens element in the first embodiment, the seventh lens element in the second embodiment, the eighth lens element in the first embodiment, and a convex critical point of the eighth lens element in the first embodiment.

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis is, the maximum imaging height of the image lens assembly is ImgH, and the following conditions are satisfied: TL/ImgH < 3.0. Therefore, the image lens group can be properly balanced between miniaturization and shooting visual angle. Wherein the following conditions may also be satisfied: TL/ImgH < 1.4. The maximum imaging height refers to a half of the total length of the diagonal of the effective sensing area corresponding to the electron-sensitive element. For example, referring to FIG. 19, a schematic diagram of the imaging area and the parameters ImgHX, ImgHY and ImgH of the sensing region of the electronic photosensitive device according to an embodiment of the present invention is shown, wherein the direction of the light beam emitted from the electro-optic device along the optical axis is the positive Z-axis direction, the direction corresponding to the long side of the sensing region of the electro-optic device is the X-axis direction, the direction corresponding to the short side of the sensing region of the electronic photosensitive device is Y-axis direction, the direction corresponding to the diagonal line of the sensing region of the electronic photosensitive device is D-axis direction, ImgHX is the maximum distance between the imaging position of the image lens group corresponding to the long side direction X of the sensing region of the electronic photosensitive device and the optical axis, ImgHY is the maximum distance between the imaging position of the image lens group corresponding to the short side direction Y of the sensing region of the electronic photosensitive device and the optical axis, and ImgH is the maximum distance between the imaging position of the image mirror group corresponding to the sensing region of the electronic photosensitive element in the diagonal direction D and the optical axis. In the example of fig. 19, ImgH is the maximum imaging height of the image mirror group (i.e. half of the total diagonal length of the effective sensing area of the electron-sensitive element), but the present invention is not limited thereto.

An axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, an entrance pupil aperture of the image lens assembly is EPD, and the following conditions are satisfied: Td/EPD < 6.0. Therefore, the sufficient light incidence amount can be ensured, the image noise is relatively low, and the image subjected to the image restoration processing can not be distorted. Wherein the following conditions may also be satisfied: Td/EPD < 3.0.

The thickness of the wavefront coding element on the optical axis is CT _ WFCC, which satisfies the following condition: CT _ WFCC <0.50[ mm ]. Therefore, the size and the thickness of the wavefront coding element can be controlled, and the use efficiency of the whole space is further improved. Wherein the following conditions may also be satisfied: CT _ WFCC <0.35[ mm ].

The curvature radius of the image-side surface of the final lens element is RL, and the focal length of the image lens assembly is f, which satisfies the following conditions: 0.15< RL/f < 0.75. Therefore, the back focal length is shortened, and the miniaturization of the module can be facilitated.

The total axial thickness of all the lenses in the image lens assembly is Σ CT, and the axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, which satisfies the following condition: 0.5< Σ CT/Td < 0.95. Therefore, the lens space can be prevented from being too small or too large, and the space utilization efficiency of the lens can be optimized.

The abbe number of a lens in the image lens group is Vi, the refractive index of the lens is Ni, and at least one lens in the image lens group can satisfy the following conditions: 8.0< Vi/Ni < 12.0. Therefore, the correction of chromatic aberration is enhanced.

The maximum effective radius of the object-side surface of the first lens element is Y11, and the maximum imaging height of the image lens assembly is ImgH, which satisfies the following conditions: Y11/ImgH < 1.0. Therefore, the effective radius of the first lens is reduced, the volume of the side end of the lens object can be effectively reduced particularly under the arrangement of a wide visual angle, and the first lens is arranged in a device with more severe space limitation. Wherein the following conditions may also be satisfied: Y11/ImgH < 0.50. Referring to fig. 18, a schematic diagram of a parameter Y11 according to the first embodiment of the present invention is shown.

The maximum distance between two points of the wavefront coding surface opposing each other in the diagonal direction within the optically effective range in parallel to the optical axis is | Δ DSag |, which can satisfy the following condition: 0.5[ micron ] < | Δ DSag | <100[ micron ]. Therefore, the wave-front coding element can provide enough conversion effect, and can avoid overlarge shape change of the wave-front coding surface so as to effectively utilize limited space. Referring to fig. 20 and 21, fig. 20 is a schematic front view of a wavefront coding device on a wavefront coding surface according to an embodiment of the present invention, and fig. 21 is a schematic side view of the wavefront coding device in a diagonal direction according to an embodiment of the present invention. In fig. 20, the direction in which light exits the wavefront coding surface along the optical axis is the positive Z-axis direction, the direction corresponding to the long side of the wavefront coding surface is the X-axis direction, the direction corresponding to the short side of the wavefront coding surface is the Y-axis direction, and the direction corresponding to the diagonal of the wavefront coding surface is the D-axis direction. In fig. 21, the direction to the right of the drawing sheet is the positive Z-axis direction, and the direction to the top of the drawing sheet is the D direction, and fig. 21 is a schematic diagram showing the parameter Δ DSag according to an embodiment of the present invention.

The separation distance between the wavefront coding element and the aperture on the optical axis is DWS, and the thickness of the wavefront coding element on the optical axis is CT _ WFCC, which can satisfy the following conditions: DWS/CT _ WFCC < 1.0. Therefore, the size and the thickness of the wavefront coding element can be controlled, and the use efficiency of the whole space is further improved. Wherein the following conditions may also be satisfied: DWS/CT _ WFCC < 0.60.

All technical features of the novel image lens assembly can be combined and configured to achieve corresponding effects.

In the image lens assembly disclosed in the present invention, the lens material can be glass or plastic. If the lens element is made of glass, the degree of freedom of refractive power configuration of the image lens assembly can be increased, and the influence of external environmental temperature variation on imaging can be reduced. If the lens material is plastic, the production cost can be effectively reduced. In the image lens assembly disclosed in the present invention, at least half of the lenses are made of plastic; therefore, the freedom degree of the lens shape design can be increased, and the lens manufacturing and aberration correction are facilitated. In addition, a spherical surface or an Aspherical Surface (ASP) can be disposed on the mirror surface, wherein the spherical lens can reduce the manufacturing difficulty, and if the aspherical surface is disposed on the mirror surface, more control variables can be obtained to reduce the aberration and the number of lenses, and the total length of the novel image lens assembly can be effectively reduced. Furthermore, the aspheric surface can be manufactured by plastic injection molding or molding glass lens.

In the image lens assembly disclosed in the present invention, if the lens surface is aspheric, it means that all or a part of the optically effective area of the lens surface is aspheric.

In the image lens assembly disclosed in the present invention, an additive can be selectively added to any one (or more) of the lens materials to change the transmittance of the lens for light of a specific wavelength band, thereby reducing stray light and color shift. For example: the additive can have the function of filtering light rays in a wave band of 600 nanometers to 800 nanometers in the system, so that redundant red light or infrared light can be reduced; or the light with wave band of 350 nm to 450 nm can be filtered out to reduce the redundant blue light or ultraviolet light, therefore, the additive can prevent the light with specific wave band from causing interference to the imaging. In addition, the additives can be uniformly mixed in the plastic and made into the lens by the injection molding technology.

In the image lens assembly disclosed in the present invention, if the lens surface is a convex surface and the position of the convex surface is not defined, it means that the convex surface can be located at a position close to the optical axis of the lens surface; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the position of the lens surface near the optical axis. If the refractive power or focal length of the lens element does not define the position of the lens region, it means that the refractive power or focal length of the lens element can be the refractive power or focal length of the lens element at the paraxial region.

In the image lens assembly disclosed in the present invention, the Critical Point (Critical Point) of the lens surface refers to a tangent Point on a tangent line tangent to the lens surface on a plane perpendicular to the optical axis, and the Critical Point is not located on the optical axis.

In the image lens assembly disclosed in the present invention, the image plane of the image lens assembly can be a plane or a curved surface with any curvature, especially a curved surface with a concave surface facing the object side, depending on the corresponding electro-optic device.

In the image lens assembly disclosed in the present invention, more than one image correction element (flat field element, etc.) can be selectively disposed between the lens closest to the image plane and the image plane on the imaging optical path, so as to achieve the effect of correcting the image (image curvature, etc.). The optical properties of the image modifying element, such as curvature, thickness, refractive index, position, profile (convex or concave, spherical or aspherical, diffractive, fresnel, etc.) can be adjusted to suit the requirements of the image capturing device. In general, the preferred imaging correction element is configured such that a thin plano-concave element having a concave surface facing the object side is disposed near the imaging surface.

In the image lens assembly disclosed in the present invention, at least one element having a light path turning function, such as a prism or a mirror, may be selectively disposed on the imaging light path between the object to be photographed and the imaging surface, so as to provide a high elasticity spatial configuration of the image lens assembly, so that the smart phone is light and thin without being limited by the total optical length of the image lens assembly. For further explanation, please refer to fig. 25 and 26, in which fig. 25 is a schematic diagram illustrating a configuration relationship of the optical path turning element in the image lens assembly according to the present invention, and fig. 26 is a schematic diagram illustrating another configuration relationship of the optical path turning element in the image lens assembly according to the present invention. As shown in fig. 25 and fig. 26, the image lens assembly can be arranged along the optical path from the object (not shown) to the image plane IM, and sequentially has a first optical axis OA1, an optical path turning element LF, and a second optical axis OA2, wherein the optical path turning element LF can be arranged between the object and the lens group LG of the image lens assembly as shown in fig. 25, or between the lens group LG of the image lens assembly and the image plane IM as shown in fig. 26. In addition, referring to fig. 27, a schematic diagram of a configuration relationship of two optical path turning elements in the image lens assembly according to the present invention is shown. As shown in fig. 27, the image lens assembly can also include a first optical axis OA1, a first light path turning element LF1, a second optical axis OA2, a second light path turning element LF2 and a third optical axis OA3 in sequence from an object (not shown) to the image plane IM along the light path, wherein the first light path turning element LF1 is disposed between the object and the lens group LG of the image lens assembly, the second light path turning element LF2 is disposed between the lens group LG of the image lens assembly and the image plane IM, and the traveling direction of the light ray on the first optical axis OA1 can be the same as the traveling direction of the light ray on the third optical axis OA3 as shown in fig. 27. The image lens assembly can also be selectively configured with more than three optical path turning elements, and the present invention is not limited by the types, the number and the positions of the optical path turning elements disclosed in the attached drawings.

In the image lens assembly disclosed herein, at least one Stop may be disposed before the first lens element, between the lens elements or after the last lens element, and the Stop may be a flare Stop (Glare Stop) or a Field Stop (Field Stop), which can reduce stray light and improve image quality.

In the image lens assembly disclosed in the present invention, the aperture can be configured as a front aperture or a middle aperture. The front diaphragm means that the diaphragm is arranged between the object to be shot and the first lens, and the middle diaphragm means that the diaphragm is arranged between the first lens and the imaging surface. If the diaphragm is a front diaphragm, a longer distance can be generated between an Exit Pupil (Exit Pupil) and an imaging surface, so that the Exit Pupil has a Telecentric (telecentricity) effect, and the image receiving efficiency of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) of the electronic photosensitive element can be increased; if the aperture is the middle aperture, the field angle of the image lens group can be enlarged.

The present invention can be properly provided with a variable aperture element, which can be a mechanical component or a light ray regulating element, and can control the size and shape of the aperture by electric or electric signals. The mechanical component can comprise a blade group, a shielding plate and other movable parts; the light regulating element may comprise a light filtering element, an electrochromic material, a liquid crystal layer and other shielding materials. The variable aperture element can enhance the image adjustment capability by controlling the amount of light entering or the exposure time of the image. In addition, the variable aperture element can also be an aperture of the present invention, and the image quality, such as the depth of field or the exposure speed, can be adjusted by changing the aperture value.

The following provides a detailed description of the embodiments with reference to the accompanying drawings.

< first embodiment >

Referring to fig. 1 to fig. 3, fig. 1 is a schematic view of an image capturing device according to a first embodiment of the present invention, fig. 2 is a graph of spherical aberration and astigmatism of a first embodiment of a wavefront coding surface of a free-form surface stated in XY multiple times in sequence from left to right, and fig. 3 is a graph of spherical aberration and astigmatism of a first embodiment of a wavefront coding surface of a free-form surface stated in zernike multiple times in sequence from left to right. As shown in fig. 1, the image capturing device includes a lens assembly (not shown) and an electro-optic element 199. The image lens assembly includes, in order from an object side to an image side along an optical path, a wavefront coding element WFCC _1, an aperture stop 100, a stop 101, a first lens element 110, a second lens element 120, a third lens element 130, a stop 102, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a stop 103, a seventh lens element 170, an eighth lens element 180, an infrared-cut Filter (IR-cut Filter)190, and an image plane 195. The electron sensor 199 is disposed on the image forming surface 195. The image mirror group comprises eight lenses (110, 120, 130, 140, 150, 160, 170, 180), and no other interpolated lens is arranged between the lenses. In the present embodiment, the eighth lens 180 is defined as a last lens.

The wavefront coding element WFCC _1 is made of plastic material, and has a wavefront coding surface WFCCs _1 on one side facing the aperture 100, and the wavefront coding surface WFCCs _1 is a free-form surface expressed by XY or zernike terms in a non-axisymmetric shape with respect to the optical axis.

The first lens element 110 with positive refractive power has a convex object-side surface 111 at a paraxial region and a concave image-side surface 112 at a paraxial region, and is made of plastic material.

The second lens element 120 with negative refractive power has a concave object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 121 has at least one critical point.

The third lens element 130 with positive refractive power has a convex object-side surface 131 at a paraxial region and a concave image-side surface 132 at a paraxial region, and both surfaces are aspheric, and the object-side surface 131 has at least one critical point.

The fourth lens element 140 with positive refractive power has a convex object-side surface 141 at a paraxial region and a convex image-side surface 142 at a paraxial region, and both surfaces are aspheric, and the image-side surface 142 has at least one critical point.

The fifth lens element 150 with negative refractive power has a convex object-side surface 151 at a paraxial region and a concave image-side surface 152 at a paraxial region, and is aspheric, wherein the object-side surface 151 has at least one critical point and the image-side surface 152 has at least one critical point.

The sixth lens element 160 with negative refractive power has an object-side surface 161 being convex at a paraxial region thereof and an image-side surface 162 being concave at a paraxial region thereof, and is aspheric, wherein the object-side surface 161 has at least one critical point and the image-side surface 162 has at least one critical point.

The seventh lens element 170 with positive refractive power has a convex object-side surface 171 at a paraxial region and a concave image-side surface 172 at a paraxial region, and is aspheric, wherein the object-side surface 171 has at least one critical point and the image-side surface 172 has at least one critical point.

The eighth lens element 180 with negative refractive power has a concave object-side surface 181 at a paraxial region and a concave image-side surface 182 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 181 has at least one critical point and the image-side surface 182 has at least one convex critical point at an off-axis region.

The ir-cut filter 190 is made of glass, and is disposed between the eighth lens element 180 and the image plane 195 without affecting the focal length of the image lens assembly.

The curve equation of the aspherical surface of each lens described above is as follows:

x: displacement of the intersection point of the aspheric surface and the optical axis to a point on the aspheric surface which is Y away from the optical axis and is parallel to the optical axis;

y: the perpendicular distance between a point on the aspheric curve and the optical axis;

r: a radius of curvature;

k: the cone coefficient; and

ai: the ith order aspheric coefficients.

The free-form surface of the XY multiple statement of the above wavefront coding surface WFCCS _1 is represented as follows:

z(x,y)＝C₁×x+C₂×y+C₃×x²+C₄×xy

x: the x-coordinate of a point on the wavefront coding surface WFCCS _ 1;

y: the y-coordinate of a point on the wavefront coding surface WFCCS _ 1; and

z: displacement of the intersection of the wavefront coding surface WFCCS _1 and the optical axis to a point on the wavefront coding surface WFCCS _1 with the coordinate (x, y) parallel to the optical axis.

The free-form surfaces of the zernike multiple-term statement of the above wavefront coding surface WFCCS _1 are represented as follows:

x: the x-coordinate of a point on the wavefront coding surface WFCCS _ 1;

y: the y-coordinate of a point on the wavefront coding surface WFCCS _ 1;

z: displacement from the intersection point of the wavefront coding surface WFCCS _1 and the optical axis to the point with the coordinate (x, y) on the wavefront coding surface WFCCS _1, which is parallel to the optical axis;

c: the reciprocal of the value of the curvature radius R at the near optical axis, namely c is 1/R;

h: the perpendicular distance between a point on the wavefront coding surface WFCCS _1 and the optical axis, i.e., h ═ sqrt (x)²+y²)；

Zi: the ith Zernike coefficient; and

ZPi: the ith zernike polynomial.

In the first embodiment of the present invention, the focal length of the image lens assembly is F, the aperture value (F-number) of the image lens assembly is Fno, the size of the long side of the sensing region of the electronic photosensitive element 199 is 2_ ImgHX (i.e. twice the maximum distance between the imaging position and the optical axis in the long side direction X of the sensing region of the electronic photosensitive element 199), the size of the short side of the sensing region of the electronic photosensitive element 199 is 2_ ImgHY (twice the maximum distance between the imaging position and the optical axis in the short side direction Y of the sensing region of the electronic photosensitive element 199), and the maximum imaging height of the image lens assembly is ImgH, which has the following values: f 6.61 mm (mm), Fno 2.45, 2_ ImgHX 9.030 mm, 2_ ImgHY 6.773 mm, and ImgH 5.644 mm.

An axial distance between the object-side surface 111 of the first lens element and the image-side surface 182 of the last lens element is Td, an entrance pupil aperture of the image lens assembly is EPD, which satisfies the following conditions: Td/EPD is 2.49.

An axial distance TL from the object-side surface 111 to the image plane 195 is defined as TL, and a maximum imaging height ImgH of the image lens assembly satisfies the following conditions: TL/ImgH is 1.37.

The curvature radius of the image-side surface 182 of the last lens element is RL, and the focal length of the image lens assembly is f, which satisfies the following conditions: RL/f is 0.52.

The total on-axis thickness of all the lenses in the image lens assembly is Σ CT, and the on-axis distance from the object-side surface 111 to the image-side surface 182 of the last lens element is Td, which satisfies the following condition: Σ CT/Td is 0.62. In the present embodiment, Σ CT is the sum of the thicknesses of the first to last lenses (the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, and the eighth lens 180) on the optical axis.

The abbe number of the first lens 110 is V1, the abbe number of the second lens 120 is V2, the abbe number of the third lens 130 is V3, the abbe number of the fourth lens 140 is V4, the abbe number of the fifth lens 150 is V5, the abbe number of the sixth lens 160 is V6, the abbe number of the seventh lens 170 is V7, the abbe number of the eighth lens 180 is V8, the refractive index of the first lens 110 is N1, the refractive index of the second lens 120 is N2, the refractive index of the third lens 130 is N3, the refractive index of the fourth lens 140 is N4, the refractive index of the fifth lens 150 is N5, the refractive index of the sixth lens 160 is N6, the refractive index of the seventh lens 170 is N7, the refractive index of the eighth lens 180 is N8, and the following conditions are satisfied: V1/N1 ═ 36.30; V2/N2 ═ 11.65; V3/N3 ═ 11.65; V4/N4 ═ 36.26; V5/N5 ═ 36.26; V6/N6 ═ 23.91; V7/N7 ═ 36.26; and V8/N8 ═ 36.46.

The maximum effective radius of the first lens object side surface 111 is Y11, which satisfies the following condition: y11 is 1.60[ mm ].

The maximum effective radius of the object-side surface 111 of the first lens element is Y11, and the maximum imaging height of the image mirror assembly is ImgH, which satisfies the following condition: Y11/ImgH is 0.28.

The separation distance between the wavefront coding element WFCC _1 and the aperture 100 on the optical axis is DWS, the thickness of the wavefront coding element WFCC _1 on the optical axis is CT _ WFCC, and when the wavefront coding surface WFCCs _1 is a free curved surface stated by XY multiple times, the following conditions are satisfied: DWS/CT _ WFCC is 0.167, which satisfies the following condition when the wavefront coding surface WFCCs _1 is a free curved surface stated by zernike terms: DWS/CT _ WFCC is 0.233.

The maximum distance between two points of the wavefront coding surface WFCCS _1 which are opposed to each other in the diagonal direction within the optically effective range in parallel with the optical axis is | Δ DSag |, and when the wavefront coding surface WFCCS _1 is a free curved surface stated by XY multiple times, it satisfies the following condition: i Δ DSag | ═ 3.064[ microns ], when wavefront coding surface WFCCS _1 is a free curved surface set forth in terms of zernike multiples, it satisfies the following condition: i Δ DSag i 14.125[ microns ].

Please refer to the following table one, table two, table three and table four, wherein, when the wavefront coding surface WFCCS _1 is a free curved surface stated by XY multiple times, it applies to table three, and when the wavefront coding surface WFCCS _1 is a free curved surface stated by zernike multiple times, it applies to table four.

The first embodiment shows detailed structural data of the first embodiment in fig. 1, wherein the unit of the radius of curvature, the thickness and the focal length is millimeters (mm), and the surfaces 0 to 25 sequentially represent the surfaces from the object side to the image side. Table two shows the aspheric data of the first embodiment, where k is the cone coefficient in the aspheric curve equation, and a4 to a20 represent the 4 th to 20 th order aspheric coefficients of each surface. Table three is XY polynomial coefficients C1 to C9 in the first embodiment, and DWS is the separation distance on the optical axis between the wavefront coding surface WFCCs _1 of the free-form surface set forth in XY polynomials of the wavefront coding element WFCC _1 and the aperture 100. Table four is zernike polynomial coefficients in the first embodiment, where NR is a normalized Radius (Normalization Radius), K is a conic constant (Conicconstant), Z1 to Z10 are first to tenth zernike coefficients, and DWS is a separation distance on the optical axis between the wavefront coding surface WFCCS _1 of the zernike polynomial of the wavefront coding element WFCC _1 and the aperture 100. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those of tables one to four of the first embodiment, which is not repeated herein.

< second embodiment >

Referring to fig. 4 to 6, wherein fig. 4 is a schematic view of an image capturing device according to a second embodiment of the present invention, fig. 5 is a graph of spherical aberration and astigmatism of a second embodiment of a wavefront coding surface of a free-form surface stated in XY multiple times in sequence from left to right, and fig. 6 is a graph of spherical aberration and astigmatism of a second embodiment of a wavefront coding surface of a free-form surface stated in zernike multiple times in sequence from left to right. As shown in fig. 4, the image capturing device includes an image lens assembly (not shown) and an electronic photosensitive element 299. The image lens assembly includes, in order from an object side to an image side along an optical path, a wavefront coding element WFCC _2, an aperture stop 200, a first lens element 210, a stop 201, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, an ir-cut filter 290 and an image plane 295. The electro-optic element 299 is disposed on the image plane 295. The image lens group comprises five lenses (210, 220, 230, 240 and 250), and no other interpolated lens is arranged between the lenses. In the present embodiment, the fifth lens 250 is defined as a last lens.

The wavefront coding element WFCC _2 is made of plastic material, and has a wavefront coding surface WFCCs _2 on a side facing the aperture 200, and the wavefront coding surface WFCCs _2 is a free-form surface expressed by XY or zernike terms in a non-axisymmetric shape with respect to the optical axis.

The first lens element 210 with positive refractive power has a convex object-side surface 211 at a paraxial region and a concave image-side surface 212 at a paraxial region, and both surfaces are aspheric, and the image-side surface 212 has at least one critical point.

The second lens element 220 with negative refractive power has a convex object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region, and is made of plastic material.

The third lens element 230 with positive refractive power has a concave object-side surface 231 at a paraxial region and a convex image-side surface 232 at a paraxial region, and is made of plastic material.

The fourth lens element 240 with positive refractive power has a concave object-side surface 241 at a paraxial region and a convex image-side surface 242 at a paraxial region, and is made of plastic material.

The fifth lens element 250 with negative refractive power has a concave object-side surface 251 and a concave image-side surface 252 at a paraxial region, both surfaces are aspheric, and the object-side surface 251 and the image-side surface 252 have at least one convex critical point at an off-axis region.

The ir-cut filter 290 is made of glass, and is disposed between the fifth lens element 250 and the image plane 295 without affecting the focal length of the image lens assembly.

Please refer to table five, table six, table seven and table eight in combination, wherein table seven is applied when the wavefront coding surface WFCCS _2 is a free curved surface stated by XY multiple times, and table eight is applied when the wavefront coding surface WFCCS _2 is a free curved surface stated by zernike multiple times.

In the second exemplary embodiment, the curve equation of the aspherical surface, the XY polynomial partial representation of the wavefront coding surface WFCCS _2 and the zernike polynomial partial representation of the wavefront coding surface WFCCS _2 are in the form of the first exemplary embodiment. In addition, in the definitions described in the following table, when the wavefront coding surface WFCCS _2 is a free curved surface stated in XY multiple times, the numerical value is denoted by "XY" in parentheses, and when the wavefront coding surface WFCCS _2 is a free curved surface stated in zernike multiple times, the numerical value is denoted by "Z" in parentheses, and the remaining definitions are the same as those in the first embodiment and will not be described again.

< third embodiment >

Referring to fig. 7 to 9, wherein fig. 7 is a schematic view of an image capturing device according to a third embodiment of the present invention, fig. 8 is a graph of spherical aberration and astigmatism of a third embodiment of a wavefront coding surface of a free-form surface stated in XY multiple times in sequence from left to right, and fig. 9 is a graph of spherical aberration and astigmatism of a third embodiment of a wavefront coding surface of a free-form surface stated in zernike multiple times in sequence from left to right. As shown in fig. 7, the image capturing device includes a lens assembly (not shown) and an electronic photosensitive element 399. The image lens assembly includes, in order from an object side to an image side along an optical path, a wavefront coding element WFCC _3, a stop 301, an aperture stop 300, a first lens element 310, a second lens element 320, a stop 302, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360, an ir-cut filter 390 and an image plane 395. The electro-optic element 399 is disposed on the image forming surface 395. The image lens group comprises six lenses (310, 320, 330, 340, 350 and 360), and no other interpolated lens is arranged between the lenses. In the present embodiment, the sixth lens 360 is defined as a last lens.

The wavefront coding element WFCC _3 is made of plastic material, and has a wavefront coding surface WFCCs _3 on a side facing the aperture 300, and the wavefront coding surface WFCCs _3 is a free-form surface expressed by XY or zernike terms in a non-axisymmetric shape with respect to the optical axis.

The first lens element 310 with negative refractive power has a concave object-side surface 311 at a paraxial region and a convex image-side surface 312 at a paraxial region, and is made of plastic material.

The second lens element 320 with positive refractive power has a convex object-side surface 321 at a paraxial region and a convex image-side surface 322 at a paraxial region, and both surfaces are aspheric, and the object-side surface 321 has at least one critical point.

The third lens element 330 with negative refractive power has a convex object-side surface 331 at a paraxial region and a concave image-side surface 332 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 331 has at least one critical point and the image-side surface 332 has at least one critical point.

The fourth lens element 340 with positive refractive power has a concave object-side surface 341 at a paraxial region and a convex image-side surface 342 at a paraxial region, and is made of plastic material.

The fifth lens element 350 with negative refractive power has a concave object-side surface 351 at a paraxial region and a concave image-side surface 352 at a paraxial region, and is aspheric, wherein the object-side surface 351 has at least one critical point and the image-side surface 352 has at least one critical point.

The sixth lens element 360 with negative refractive power has a convex object-side surface 361 at a paraxial region and a concave image-side surface 362 at a paraxial region, and both surfaces are aspheric, and the object-side surface 361 has at least one critical point and the image-side surface 362 has at least one convex critical point at an off-axis region.

The ir-cut filter 390 is made of glass, and is disposed between the sixth lens element 360 and the image plane 395 without affecting the focal length of the image lens assembly.

Please refer to the following nine, ten, eleventh and twelfth tables, wherein, when the wavefront coding surface WFCCS _3 is a free curved surface stated by XY multiple times, the eleven table is applied, and when the wavefront coding surface WFCCS _3 is a free curved surface stated by zernike multiple times, the twelve table is applied.

In the third exemplary embodiment, the curve equation of the aspherical surface, the XY polynomial partial representation of the wavefront coding surface WFCCS _3 and the zernike polynomial partial representation of the wavefront coding surface WFCCS _3 are in the form of the first exemplary embodiment. In addition, the definitions described in the following table are the same as those in the above embodiments, and are not repeated herein.

< fourth embodiment >

Referring to fig. 10 to 12, wherein fig. 10 is a schematic view of an image capturing device according to a fourth embodiment of the present invention, fig. 11 is a graph of spherical aberration and astigmatism of a fourth embodiment of a wavefront coding surface of a free-form surface stated in XY multiple times in sequence from left to right, and fig. 12 is a graph of spherical aberration and astigmatism of the fourth embodiment of a wavefront coding surface of a free-form surface stated in zernike multiple times in sequence from left to right. As shown in fig. 10, the image capturing device includes an image lens assembly (not shown) and an electro-optic device 499. The image lens assembly includes, in order from an object side to an image side along an optical path, a wavefront coding element WFCC _4, an aperture stop 400, a first lens element 410, a second lens element 420, a stop 401, a third lens element 430, a stop 402, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, a seventh lens element 470, an ir-cut filter element 490, and an image plane 495. The electrophotographic photosensitive member 499 is disposed on the image plane 495. The image mirror group comprises seven lenses (410, 420, 430, 440, 450, 460, 470) and no other interpolated lens between the lenses. In the present embodiment, the seventh lens 470 is defined as a last lens.

The wavefront coding element WFCC _4 is made of plastic material, and has a wavefront coding surface WFCCs _4 on a side facing the aperture 400, and the wavefront coding surface WFCCs _4 is a free-form surface expressed by XY or zernike terms in a non-axisymmetric shape with respect to the optical axis.

The first lens element 410 with positive refractive power has a convex object-side surface 411 at a paraxial region and a concave image-side surface 412 at a paraxial region, and is made of plastic material.

The second lens element 420 with negative refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at the paraxial region, and is made of plastic material.

The third lens element 430 with negative refractive power has a concave object-side surface 431 at a paraxial region and a concave image-side surface 432 at a paraxial region, and both surfaces are aspheric, and the image-side surface 432 has at least one critical point.

The fourth lens element 440 with positive refractive power has a convex object-side surface 441 at a paraxial region and a convex image-side surface 442 at a paraxial region, and both surfaces are aspheric, and the object-side surface 441 has at least one critical point.

The fifth lens element 450 with positive refractive power has an object-side surface 451 being convex in a paraxial region thereof and an image-side surface 452 being concave in a paraxial region thereof, and both surfaces are aspheric, the object-side surface 451 has at least one critical point, and the image-side surface 452 has at least one critical point.

The sixth lens element 460 with positive refractive power has a convex object-side surface 461 at a paraxial region and a concave image-side surface 462 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 461 has at least one critical point and the image-side surface 462 has at least one critical point.

The seventh lens element 470 with negative refractive power has a concave object-side surface 471 at a paraxial region and a concave image-side surface 472 at a paraxial region, both surfaces being aspheric, the object-side surface 471 has at least one critical point, and the image-side surface 472 has at least one convex critical point at an off-axis region.

The ir-cut filter 490 is made of glass, and is disposed between the seventh lens element 470 and the image plane 495, and does not affect the focal length of the image lens assembly.

Please refer to the following thirteen, fourteen, fifteen and sixteen, wherein, when the wavefront coding surface WFCCS _4 is a free curved surface stated by XY multiple times, it applies to fifteen, and when the wavefront coding surface WFCCS _4 is a free curved surface stated by zernike multiple times, it applies to sixteen.

In the fourth exemplary embodiment, the curve equation of the aspherical surface, the XY polynomial partial representation of the wavefront coding surface WFCCS _4 and the zernike polynomial partial representation of the wavefront coding surface WFCCS _4 are in the form of the first exemplary embodiment. In addition, the definitions described in the following table are the same as those in the above embodiments, and are not repeated herein.

< fifth embodiment >

Referring to fig. 13, a schematic perspective view of an image capturing device according to a fifth embodiment of the present invention is shown. In the present embodiment, the image capturing device 10 is a camera module. The image capturing device 10 includes an imaging lens 11, an electronic photosensitive element 13, and an image stabilizing module 14. The imaging lens 11 includes the image lens assembly of the first embodiment, a lens barrel (not shown) for carrying the image lens assembly, and a Holder Member (not shown). The imaging lens 11 may be configured with the image lens group according to other embodiments, and the present invention is not limited thereto. The image capturing device 10 uses the imaging lens 11 to focus light to generate an image, and finally forms the image on the electronic sensor 13 and outputs the image as image data.

The image capturing device 10 carries an electro-optic sensor 13 (such as CMOS, CCD) with good sensitivity and low noise on the image plane of the image lens assembly, so as to truly present the good image quality of the image lens assembly.

The image stabilization module 14 is, for example, an accelerometer, a gyroscope, or a Hall Effect Sensor. The Image Stabilization module 14 may utilize an Image compensation technique in the Image software to provide an Electronic Image Stabilization (EIS) function, so as to further improve the imaging quality of the dynamic and low-illumination scene shooting.

The image capturing device of the present invention is not limited to the above structure. The image capturing device 10 may also be configured with a flash module 21 (shown in fig. 14), wherein the flash module 21 can supplement light to increase the amount of light entering during shooting.

< sixth embodiment >

Referring to fig. 14 to 16, wherein fig. 14 is a schematic perspective view of a smart phone according to a sixth embodiment of the present invention, fig. 15 is a schematic perspective view of another side of the smart phone of fig. 14, and fig. 16 is a system block diagram of the smart phone of fig. 14.

In the present embodiment, the smartphone 20 includes the Image capturing device 10 of the fifth embodiment, a flash module 21, an Image Processor 23(Image Processor), a user interface 24, and an Image software Processor 25.

When a user shoots a subject 26, the smartphone 20 uses the image capturing device 10 to collect light for image capturing, and starts the flash module 21 to supplement light, and the image processor 23 performs image optimization processing to further improve the quality of an image generated by the image lens assembly. The user interface 24 may employ a touch screen or a physical capture button, which is used in conjunction with the various functions of the image software processor 25 to capture and process images. The images processed by the image software processor 25 may be displayed on the user interface 24.

Specifically, the image processor 23 includes a fourier transform module 23a, and the fourier transform module 23a is electrically connected to the electro-optic device 13. In addition, referring to fig. 23, a schematic diagram of an imaging process of the wavefront coding device according to an embodiment of the present invention is shown. The image mirror group provided with the wavefront coding element has an optical imaging path with a Point Spread Function (PSF). In the imaging process, the imaging light passing through the image mirror group is imaged on the electronic photosensitive element 13 through the point spread function, the optical information captured by the electronic photosensitive element 13 is transmitted to the image processor 23 electrically connected to the electronic photosensitive element 13, the fourier transform module 23a in the image processor 23 converts the optical information into an image in the frequency domain, noise and data of the point spread function through fourier transform, after the noise is removed by the image processor 23, the fourier transform module 23a inverts the remaining image in the frequency domain and the data of the point spread function into processed optical information through fourier inverse transform, and finally the image processor 23 converts the processed optical information into an image through deconvolution. Because the noise is removed, the image converted back finally is a clear image. Referring to fig. 24A and 24B, fig. 24A is a schematic diagram illustrating an imaging effect of a conventional camera without a wavefront coding device, and fig. 24B is a schematic diagram illustrating comparison of imaging effects of a wavefront coding device (left side of fig. 24B) and a wavefront coding device and processing of fourier transform and deconvolution by an image processor (right side of fig. 24B), which are all shooting situations of the same subject at an object distance of 15 mm. It can be seen from fig. 24A and 24B that the image without the wavefront coding element (fig. 24A) has a poor resolution, the image quality can be improved by the image with the wavefront coding element (left in fig. 24B), and the image with the wavefront coding element and the image processor (right in fig. 24B) can be most clearly processed by the fourier transform and deconvolution.

< seventh embodiment >

Fig. 17 is a schematic perspective view of one side of a smart phone according to a seventh embodiment of the present invention.

In the present embodiment, the smart phone 30 includes the image capturing device 10, the image capturing device 10a, the image capturing device 10b and a display device (not shown) of the fifth embodiment. In fig. 17, the image capturing device 10a and the image capturing device 10b are all disposed on the same side of the smartphone 30 and face the same direction, and are all single-focus. The image capturing device 10, the image capturing device 10a and the image capturing device 10b of the present embodiment have different viewing angles. Among the

image capturing devices

10, 10a and 10b, the largest maximum viewing angle is the image capturing device 10, the smallest maximum viewing angle is the image capturing device 10b, and the maximum viewing angles of the

image capturing devices

10 and 10b may be different by at least 30 degrees. The image capturing device 10a is a telescopic image capturing device, the image capturing device 10b is an ultra-wide angle image capturing device, and the viewing angle of the image capturing device 10 is between the image capturing device 10a and the image capturing device 10 b. In this way, the smart phone 30 can provide different magnifications to achieve the photographing effect of the optical zoom, and the user can manually adjust the photographing angle of view through a user interface (not shown) on the same side as the display device to switch between the different

image capturing devices

10, 10a, and 10 b. The image capturing device 10a may be a telescopic image capturing device having a turning optical path configuration, and the turning optical path configuration of the image capturing device 10a may have a structure similar to that of fig. 25 to 27, for example, and refer to the description above corresponding to fig. 25 to 27, which is not described herein again. Further, the image capturing device 10 of the present embodiment further includes an extended image signal processor 37, so that when the image capturing device 10 is assembled with the telescopic image capturing device 10a and the wide-angle image capturing device 10b, the zoom function of the image formed on the touch screen can be performed, so as to correspond to the image processing function of the multi-lens system. The smartphone 30 equipped with the image capturing device 10 has a photographing function in multiple modes, such as zooming, telescopic, multi-lens common photographing, self-photographing optimization, High Dynamic Range (HDR) under a low light source, and high resolution 4K video recording.

The image capturing device 10 of the present invention is not limited to be applied to a smart phone. The image capturing device 10 can be applied to a mobile focusing system according to the requirement, and has the characteristics of excellent aberration correction and good imaging quality. For example, the image capturing device 10 can be applied to electronic devices such as three-dimensional (3D) image capturing, digital cameras, mobile devices, tablet computers, smart televisions, network monitoring equipment, driving recorders, back-up developing devices, multi-lens devices, identification systems, motion sensing game machines, wearable devices, and the like. The smart phone disclosed in the foregoing is merely an exemplary illustration of the practical application of the present invention, and does not limit the application scope of the image capturing device of the present invention.

Although the present invention has been described with reference to the above preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An image lens assembly comprising a wavefront coding element, an aperture and a plurality of lenses, wherein the wavefront coding element and the aperture are both disposed at one side of the plurality of lenses, no lens is disposed between the wavefront coding element and the aperture, the plurality of lenses respectively have an object-side surface facing a subject and an image-side surface facing an imaging plane, and the plurality of lenses comprise a first lens closest to the subject and a last lens closest to the imaging plane;

the total number of the lenses is at least four, at least half of the lenses are made of plastic materials, and at least one lens surface in the lenses is provided with at least one critical point;

an axial distance between the object-side surface of the first lens element and the image plane is TL, a maximum imaging height of the image lens assembly is ImgH, an axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, and an entrance pupil aperture of the image lens assembly is EPD, where the following conditions are satisfied:

TL/ImgH < 3.0; and

Td/EPD<6.0。

2. the imaging lens assembly of claim 1, wherein the total number of the plurality of lenses is five.

3. The imaging lens group of claim 1, wherein the total number of the plurality of lenses is six.

4. The imaging lens group of claim 1, wherein the total number of the plurality of lenses is seven.

5. The imaging lens group of claim 1, wherein the total number of the plurality of lenses is eight.

6. The imaging lens assembly of any one of claims 1 to 5, wherein the image-side surface of the last lens element is aspheric and concave at a paraxial region, and the image-side surface of the last lens element has at least one convex critical point at an off-axis region.

7. The imaging lens group according to any one of claims 1 to 5, wherein a radius of curvature of the image-side surface of the last lens element is RL, and a focal length of the imaging lens group is f, which satisfies the following condition:

0.15<RL/f<0.75。

8. the imaging lens assembly of any one of claims 1 to 5, wherein a sum of thicknesses of all lenses in the imaging lens assembly is Σ CT, an axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, and the following conditions are satisfied:

0.5<ΣCT/Td<0.95。

9. the imaging lens assembly of claim 1, wherein an abbe number of a lens is Vi, a refractive index of the lens is Ni, and at least one lens in the imaging lens assembly satisfies the following condition:

8.0<Vi/Ni<12.0。

10. the imaging lens assembly of claim 1, wherein the maximum effective radius of the object-side surface of the first lens element is Y11, and the maximum imaging height of the imaging lens assembly is ImgH, which satisfies the following condition:

Y11/ImgH<1.0。

11. the imaging lens assembly of claim 10, wherein the maximum effective radius of the object-side surface of the first lens element is Y11, and the maximum imaging height of the imaging lens assembly is ImgH, which satisfies the following condition:

Y11/ImgH<0.50。

12. the imaging lens assembly of claim 1, wherein an axial distance between the object-side surface of the first lens element and the image plane is TL, and a maximum imaging height of the imaging lens assembly is ImgH, which satisfies the following condition:

TL/ImgH<1.4。

13. the imaging lens assembly of claim 1, wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, and an entrance pupil aperture of the imaging lens assembly is EPD, wherein the following conditions are satisfied:

Td/EPD<3.0。

14. the imaging lens assembly of claim 1, wherein the wavefront coding element has a wavefront coding surface, and the wavefront coding surface has a non-axisymmetric shape;

wherein the thickness of the wavefront coding element on the optical axis is CT _ WFCC, which satisfies the following condition:

CT _ WFCC <0.50 mm.

15. The imaging lens set according to claim 14, wherein the wavefront coding surface is a free-form surface of XY multiple statements.

16. The imaging lens set of claim 14, wherein the wavefront coding surface is a zernike multi-item set free-form surface.

17. The imaging lens assembly of claim 1, wherein the optically effective area of the wavefront coding element is substantially rectangular.

18. A smart phone, comprising:

the set of image mirrors according to claim 1;

an electronic photosensitive element disposed on the image plane of the image mirror group; and

and the image processor is electrically connected with the electronic photosensitive element.

19. The smartphone of claim 18, wherein the image processor comprises a fourier transform module, and the fourier transform module is electrically connected to the electronic photosensitive element.

20. The smartphone of claim 19, comprising at least three image capturing devices, wherein the at least three image capturing devices comprise a first image capturing device, a second image capturing device, and a third image capturing device, the first image capturing device, the second image capturing device, and the third image capturing device all face a same side of the smartphone, the first image capturing device comprises the image lens assembly and the electronic photosensitive element, a maximum viewing angle of the at least three image capturing devices is the first image capturing device, a minimum maximum viewing angle of the at least three image capturing devices is the third image capturing device, and a difference between maximum viewing angles of the first image capturing device and the third image capturing device is at least 30 degrees.

21. An image lens assembly comprising a wavefront coding element, an aperture and a plurality of lenses, wherein the wavefront coding element and the aperture are both disposed at one side of the plurality of lenses, no lens is disposed between the wavefront coding element and the aperture, the plurality of lenses respectively have an object-side surface facing a subject and an image-side surface facing an imaging plane, and the plurality of lenses comprise a first lens closest to the subject and a last lens closest to the imaging plane;

the wavefront coding element is made of plastic materials, and is provided with a wavefront coding surface which is in a non-axisymmetric shape;

wherein an axial thickness of the wavefront coding element is CT _ WFCC, an axial distance between the object-side surface of the first lens element and the image plane is TL, a maximum imaging height of the image lens assembly is ImgH, an axial distance between the object-side surface of the first lens element and the image-side surface of the last lens element is Td, and an entrance pupil aperture of the image lens assembly is EPD, and the following conditions are satisfied:

CT _ WFCC <0.35 mm;

TL/ImgH < 3.0; and

Td/EPD<6.0。

22. the imaging lens assembly according to claim 21, wherein the maximum distance between two points of the wavefront coding surface opposite to each other in a diagonal direction within the optical effective range in parallel with the optical axis is | Δ DSag |, which satisfies the following condition:

0.5 microns < | Δ DSag | <100 microns.

23. The imaging lens set of claim 21, wherein the wavefront coding surface is a free-form surface of XY multiple statements.

24. The imaging lens set of claim 21, wherein the wavefront coding surface is a zernike multi-item set free-form surface.

25. The imaging lens assembly of claim 21, wherein the separation distance between the wavefront coding element and the aperture is DWS, and the thickness of the wavefront coding element on the optical axis is CT _ WFCC, which satisfies the following condition:

DWS/CT_WFCC<1.0。

26. the imaging lens assembly of claim 21, wherein the plurality of lenses comprises five to nine lenses.

27. The imaging lens set of claim 21, wherein the wavefront coding surface faces the aperture.

28. A smart phone, comprising:

the set of image mirrors of claim 21;

29. The smartphone of claim 28, wherein the image processor comprises a fourier transform module, and the fourier transform module is electrically connected to the electronic photosensitive element.

30. The smartphone of claim 29, comprising at least three image capturing devices, wherein the at least three image capturing devices comprise a first image capturing device, a second image capturing device and a third image capturing device, the first image capturing device, the second image capturing device and the third image capturing device all face the same side of the smartphone, the first image capturing device comprises the image lens assembly and the electronic photosensitive element, the maximum viewing angle of the at least three image capturing devices is the first image capturing device, the minimum maximum viewing angle of the at least three image capturing devices is the third image capturing device, and the maximum viewing angle difference between the first image capturing device and the third image capturing device is at least 30 degrees.