CN112202999B - Imaging device and electronic apparatus - Google Patents

Imaging device and electronic apparatus Download PDF

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CN112202999B
CN112202999B CN202011062847.4A CN202011062847A CN112202999B CN 112202999 B CN112202999 B CN 112202999B CN 202011062847 A CN202011062847 A CN 202011062847A CN 112202999 B CN112202999 B CN 112202999B
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lens
diffractive
diffraction
lens mechanism
image pickup
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CN112202999A (en
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孔德卿
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Priority to PCT/CN2021/120606 priority patent/WO2022068712A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
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Abstract

The application discloses camera device, including sensitization chip (100), first lens mechanism (200), second lens mechanism (300) and light filter (400), first lens mechanism (200) are located between sensitization chip (100) and second lens mechanism (300), second lens mechanism (300) are including refracting and diffracting lens (310), in the direction of throwing light to sensitization chip (100), it sets gradually with first lens mechanism (200) to refract diffracting lens (310), light filter (400) are located between sensitization chip (100) and first lens mechanism (200), the ambient light through second lens mechanism (300) can be refracted and diffracted by refracting and diffracting lens (310), and the ambient light after refracting and diffracting can be in proper order through first lens mechanism (200) and light filter (400) and throw to sensitization chip (100). The application also discloses an electronic device. The proposal can solve the contradiction between the thickness of the electronic equipment and the size of the camera device in the background technology.

Description

Imaging device and electronic apparatus
Technical Field
The application belongs to the technical field of communication equipment, and particularly relates to a camera device and electronic equipment.
Background
Electronic equipment is generally provided with an image pickup device, and an image pickup function is realized. As the user's shooting needs increase, the performance of the camera device continues to be optimized. In order to improve the imaging quality, the size of the imaging device configured in the electronic device is larger and larger, and thus better optical performance can be realized.
As electronic devices are becoming thinner and lighter, the thickness of the electronic devices is difficult to increase. In this case, the size of the imaging device is becoming larger, which is contradictory to the demand for the electronic device to be thinner, so that it is difficult for the electronic device to configure an imaging device with better performance, and obviously, this may affect the performance of the electronic device.
Disclosure of Invention
An object of the embodiments of the present application is to provide an image pickup apparatus and an electronic device, which can solve the contradiction between the thickness of the electronic device and the size of the image pickup apparatus in the background art.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, the embodiment of the application discloses a camera device includes sensitization chip, first lens mechanism and second lens mechanism, first lens mechanism is located sensitization chip with between the second lens mechanism, second lens mechanism including refraction and diffraction lens, to in the direction that sensitization chip throws light, refraction and diffraction lens with first lens mechanism sets gradually, camera device still includes the light filter, the light filter is located sensitization chip with between the first lens mechanism, through the ambient light of second lens mechanism can be quilt refraction and diffraction lens refraction and diffraction, and after refraction and diffraction ambient light can pass through in proper order first lens mechanism with the light filter throws extremely on the sensitization chip.
In a second aspect, an embodiment of the present application discloses an electronic device including the above-described image capturing apparatus.
This application adopts above-mentioned technical scheme can reach following beneficial effect:
the utility model provides a camera device, structure through camera device in the background art improves, make second lens mechanism include refraction and diffraction lens, when ambient light passes through refraction and diffraction lens, refraction and diffraction lens can make the colour difference that the diffraction produced and the colour difference that the refraction produced offset each other, in the direction of throwing light to the sensitization chip, refraction and diffraction lens sets gradually with first lens mechanism, ambient light through second lens mechanism can be refracted and diffracted by refraction and diffraction lens, and ambient light after the refraction can be filtered by the light filter behind first lens mechanism, and then throw to the sensitization chip, realize the formation of image of sensitization chip.
The camera device disclosed by the embodiment of the application can ensure that the camera device can offset chromatic aberration and ensure the imaging quality by replacing part of lenses with the refraction and diffraction lenses and further can ensure that the camera device does not need to be additionally provided with lenses for eliminating chromatic aberration, thereby reducing the number of the lenses.
Drawings
Fig. 1 is a schematic structural diagram of a first image capture device disclosed in an embodiment of the present application;
fig. 2 is a partial structural schematic view of a diffractive refraction lens in a first image pickup apparatus disclosed in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second image capture device disclosed in the embodiment of the present application;
fig. 4 is a schematic structural diagram of a third image capturing apparatus disclosed in the embodiment of the present application;
fig. 5 is a partial structural schematic view of a diffractive refraction lens in a third image pickup apparatus disclosed in the embodiment of the present application.
Description of reference numerals:
100-photosensitive chip,
200-first lens mechanism, 210-lens holder, 220-third lens,
300-second lens means, 300 a-first optic, 300 b-second optic, 310-diffractive optic, 311-base, 311 a-first surface, 311 b-second surface, 311 c-third surface, 312-diffractive protrusions,
400-optical filter.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The following describes an imaging apparatus provided in an embodiment of the present application in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.
As shown in fig. 1 to 5, an embodiment of the present application discloses an image pickup apparatus, which is applicable to an electronic device. The disclosed image pickup apparatus includes a photosensitive chip 100, a first lens mechanism 200, a second lens mechanism 300, and an optical filter 400.
The photosensitive chip 100 is a component for imaging in the image pickup apparatus, and in a specific shooting process, ambient light reflected by a shot object can be finally projected onto the photosensitive chip 100, and a photosensitive surface of the photosensitive chip 100 can convert an optical signal into an electrical signal corresponding to the optical signal, so that an imaging purpose is achieved. In a general case, the photosensitive chip 100 may be a CCD (Charge Coupled Device) Device, or may also be a CMOS (Complementary Metal Oxide Semiconductor) Device, and the specific kind of the photosensitive chip 100 is not limited in the embodiment of the present application.
The first lens mechanism 200 and the second lens mechanism 300 are both light distribution devices, and in a general case, the image pickup apparatus may include a lens holder, and the first lens mechanism 200 and the second lens mechanism 300 are both mounted in a lens barrel of a lens of the image pickup apparatus and then mounted in the lens holder through the lens, thereby realizing the mounting of the first lens mechanism 200 and the second lens mechanism 300.
First lens mechanism 200 is located between sensitization chip 100 and second lens mechanism 300, and in the direction that is close to sensitization chip 100, second lens mechanism 300 sets gradually with first lens mechanism 200, and second lens mechanism 300 and first lens mechanism 200 all can carry out optical control to ambient light, reach the purpose of grading. In a specific working process, the ambient light may sequentially pass through the second lens mechanism 300 and the first lens mechanism 200 and then be projected onto the photosensitive chip 100, so as to finally realize photosensitive imaging of the photosensitive chip 100.
In the embodiment of the present application, the first lens mechanism 200 may include a common lens, such as a convex lens, a concave lens, etc., and the embodiment of the present application does not limit the specific type and number of the lens included in the first lens mechanism 200. In an alternative, the first lens mechanism 200 may include a lens holder 210 and at least two third lenses 220, the at least two third lenses 220 being mounted on the lens holder 210 to facilitate a pre-assembled and integral mounting.
The second lens mechanism 300 includes a diffractive refraction optic 310, and the diffractive refraction optic 310 can refract the ambient light. The diffractive refraction mirror 310 and the first lens mechanism 200 are sequentially disposed in a direction of projecting light to the photo sensor 100. The refraction and diffraction lens 310 can refract and diffract the ambient light passing through, and according to the principle of refraction and diffraction, the process of refraction and diffraction of the ambient light can generate chromatic aberration. Because refraction and diffraction lens 310 can be enough to refract ambient light, can diffract ambient light again, therefore refraction and diffraction lens 310 can offset each other the colour difference that produces and refract ambient light to ambient light's colour difference to can alleviate or even eliminate the colour difference that the ambient light produced in the shooting process.
The optical filter 400 is located between the photo sensor chip 100 and the first lens mechanism 200, and the ambient light passing through the first lens mechanism 200 can be filtered by the optical filter 400 and then projected onto the photo sensor chip 100. The filter 400 can filter out interference light of the camera device in the shooting process, the type of the filter 400 can be various, in an optional scheme, the filter 400 can be an infrared filter, and the infrared filter can absorb infrared light in the ambient light passing through the first lens mechanism 200, so that the imaging effect of the camera device is better.
In a specific operation process, the ambient light passing through the second lens mechanism 300 can be refracted and diffracted by the refracting and diffracting optic 310, and the refracted and diffracted ambient light can be projected onto the photo sensor chip 100 through the first lens mechanism 200 and the optical filter 400 in sequence.
In the embodiment of the present application, the diffractive refraction lens 310 has a diffractive structure, and the diffractive structure can perform a diffractive effect on the ambient light. The diffractive structure may be located on one side of the diffractive optical element 310, and specifically, the diffractive structure may be located on an image side of the diffractive optical element 310 or on an object side of the diffractive optical element 310. Of course, the diffraction structure may be located inside the diffractive optic 310 as long as the diffraction of the ambient light is not affected, and the specific location of the diffraction structure in the diffractive optic 310 is not limited in this application.
The imaging device disclosed in the embodiment of the application improves the structure of the imaging device in the background art, so that the second lens mechanism 300 includes the refraction and diffraction lens 310, when the ambient light passes through the refraction and diffraction lens 310, the refraction and diffraction lens 310 can make chromatic aberration generated by diffraction and chromatic aberration generated by refraction offset each other, in the direction of projecting light to the photosensitive chip 100, the refraction and diffraction lens 310 and the first lens mechanism 200 are sequentially arranged, the ambient light passing through the second lens mechanism 300 can be refracted and diffracted by the refraction and diffraction lens 310, and the ambient light after refraction and diffraction can be projected by the first lens mechanism 200, then filtered by the optical filter 400 and finally projected onto the photosensitive chip 100, thereby realizing imaging of the photosensitive chip 100.
The camera device disclosed in the embodiment of the application, through replacing part of the lenses with the refraction and diffraction lens 310, because the refraction and diffraction lens 310 can counteract the chromatic aberration, and then the camera device does not need to be additionally provided with a lens for eliminating the chromatic aberration, the structure can ensure that the camera device can counteract the chromatic aberration and ensure the imaging quality, and can reduce the number of the lenses of the camera device, so that the size of the camera module is reduced, and finally the contradiction between the size of the camera device and the thickness of the electronic equipment can be solved.
In the embodiment of the present application, the refractive and diffractive lens 310 is made of various materials, and in an alternative, the refractive and diffractive lens 310 is made of a glass material, in which case the refractive and diffractive lens 310 is a glass structural member. In another alternative, the diffractive optic 310 can be made of an optical plastic, in which case the diffractive optic 310 is an optical plastic structural member, and the optical plastic is light, so as to reduce the mass of the diffractive optic 310, and thus the lens of the image capturing device. In the case that the image pickup apparatus includes the zoom motor, the zoom motor may drive the lens to move, and since the mass of the lens can be reduced, the image pickup apparatus does not need to be provided with a zoom motor having a large power, which is advantageous to reduce the cost of the image pickup apparatus and also reduce the power consumption.
In addition, the optical plastic structural member can be processed in an injection molding manner, and the injection molding manner enables the processing of the catadioptric lens 310 to be simpler, is more suitable for mass production, and has lower processing cost. In the embodiments of the present application, the optical plastic may be various, such as PC (Polycarbonate), COC (Cyclic Olefins copolymer), COP (Cyclic Olefins Polymer), etc., and the embodiments of the present application are not limited to specific types of optical plastics.
In the embodiment of the present application, refractive index n of diffractive optic 310dCan be greater than 1.5RIU and be less than 1.8RIU (RIU, Refractive index unit), through detecting, refraction diffraction lens 310 of this kind of Refractive index scope can make the environment light of projection obtain better refraction effect when passing through to can make the colour difference that the diffraction produced offset the colour difference that the diffraction produced better, can obtain better imaging quality finally.
In an embodiment of the present application, the diffractive optic 310 may include a plurality of concentrically disposed diffractive protrusions 312, and the plurality of concentrically disposed diffractive protrusions 312 form a diffractive structure of the diffractive optic 310. Specifically, the diffraction protrusion 312 may face the first lens mechanism 200, and when the ambient light passes through the refraction and diffraction lens 310, the ambient light is refracted by the refraction surface first, and then diffracted by the diffraction protrusion 312, so as to achieve the purpose of canceling out chromatic aberration generated by refraction and diffraction. It should be noted that the refractive surface refers to a surface of the diffractive optical element 310 facing away from the diffractive protrusion 312, i.e., a first surface 311a described later.
The plurality of diffraction protrusions 312 are concentrically arranged, so that the diffraction structure formed by the diffractive optical element 310 is a sawtooth-shaped structure, and in an alternative scheme, in a radial direction from the center of the diffractive optical element 310 to the center, the distance between the top ends of two adjacent diffraction protrusions 312 (i.e. the period Λ of the diffraction structure) is gradually decreased, and further the period Λ of the diffraction structure is gradually decreased from the center of the diffraction structure to the edge of the diffraction structure. The diffractive lens 310 may be a circular lens, and the plurality of diffractive protrusions 312 are annular protrusions concentrically arranged.
In a further embodiment, the distance between the top ends of two adjacent diffraction protrusions 312 (equal to the period Λ of the diffraction structure) may be greater than 0.5 μm and less than 300 μm, where it should be noted that the diffraction protrusions 312 have a root and a top, the top of the diffraction protrusion 312 is the top of the diffraction protrusion 312, and the root of the diffraction protrusion 312 is the bottom of the diffraction protrusion 312. Through detection, the distance between the top ends of the two adjacent diffraction bulges 312 can better ensure the diffraction effect, and is helpful for enabling the chromatic aberration generated by diffraction to offset the chromatic aberration generated by refraction.
In a further aspect, the height h of the diffractive protrusions 312dMay be greater than 0.1 μm and less than 30 μm. Through detection, the height of the diffraction bump 312 can better ensure the diffraction effect. Note that the height of the diffraction projections 312 refers to the dimension of the diffraction projections 312 in the direction from the bottom end to the top end. Specifically, the heights of the diffraction protrusions 312 may decrease or increase in a radial direction from the center of the diffractive optical element 310 to a radial direction away from the center, and of course, the heights of all the diffraction protrusions 312 of the diffractive optical element 310 may be equal.
In this embodiment, the diffractive refractive lens 310 may further include a base layer 311, the diffractive protrusion 312 may be disposed on the base layer 311, a surface of the base layer 311 departing from the diffractive protrusion 312 is a first surface 311a, the first surface 311a may be a plane, a concave surface or a convex surface, the specific surface type may be a spherical surface or an aspheric surface, and the specific surface type may be determined optimally according to requirements, which is not limited by the embodiment of the present application. In the case that the surface of the base layer 311 facing away from the diffractive protrusions 312 is spherical or aspherical, the refractive effect of the catadioptric lens 310 can be more optimized.
In an alternative embodiment, the center thickness h of the base layer 311cThe thickness of the edge of the base layer 311 may be greater than 0.1mm and less than 0.6mm, and the thickness of the center of the base layer 311 is greater than the thickness of the edge, so that the diffractive refraction lens 310 can perform a more obvious refraction function. It should be noted that the central thickness of the diffractive optical element 310 can be regarded as the thickness of the central axis of the diffractive optical element 310 (i.e. the optical axis of the diffractive optical element 310), and the edge thickness of the diffractive optical element 310 can be regarded as the thickness of the diffractive optical element 310Thickness at the rounded edge of lens 310.
In this specific scheme, the base layer 311 can provide a setting basis for the diffraction protrusion 312, so that the diffraction protrusion 312 has high strength and is not easily damaged. At the same time, the base layer 311 also facilitates the formation of the diffraction protrusions 312. Of course, the base layer 311 may also be a light-transmitting material, so as to ensure the passage of ambient light. Specifically, the material of the base layer 311 is the same as that of the diffraction bump 312, and may be made of a material such as glass, optical plastic, or the like.
In a specific embodiment, in the case that the first surface 311a is aspheric, the aspheric equation of the first surface 311a is shown in the following formula (1):
Figure BDA0002712914290000071
in the formula (1), c is the curvature of the first surface 311a, K is a conic constant, A2nIs aspheric coefficient of power 2n, r is the distance of the ambient light from the optical axis, which herein refers to the optical axis of the diffractive refractive lens 310, xrIs a distance between each point of the first surface 311a and a base plane which is a plane passing through the center of the first surface 311a and perpendicular to the optical axis, the distance being a distance in the optical axis direction.
In another specific embodiment, the surface of the base layer 311 for supporting the diffraction protrusion 312 is a second surface 311b, the second surface 311b is a reference surface of the diffraction structure, and the second surface 311b may be a plane, a spherical surface or an aspheric surface, and likewise, the specific surface type of the second surface 311b is not limited in this embodiment of the application. The surface on which the top ends of all the diffractive protrusions 312 are located is the third surface 311c, and the height of the diffractive structure can be considered as the distance between the second surface 311b and the third surface 311 c.
In the case where the second surface 311b is an aspheric surface, the surface equation of the diffractive structure is shown in the following formula (2):
Figure BDA0002712914290000081
in the formula (2), xdIs the distance of each point of the diffractive structure from the reference plane of the diffractive structure, the distance being the distance in the direction of the optical axis, c is the curvature of the second surface 311b, K is the conic constant, a2nIs aspheric coefficient of 2n, r is distance of ambient light from the optical axis, n is number of diffraction zones counted from the center to the edge of the diffractive structure 310, i.e. number of diffraction protrusions 312, in case of annular protrusions 312, one annular protrusion is one diffraction zone, h isdThe height of the diffraction structure, i.e., the distance between the third surface 311c and the second surface 311b, calculated by scalar diffraction theory is 0.1 μm<hd<30 μm and phi is the optical path length produced by diffraction by the diffraction structure, and can be calculated by the following formula (3).
φ＝(C2r2+C4r4+C6r6+…+C2nr2n)×2π/λ (3)
In the formula (3), C2nIs the phase coefficient to the power of 2n, λ is the wavelength of the ambient light, and r is the distance of the ambient light from the optical axis.
In the embodiment of the present application, the 1 st order diffraction of the diffraction structure is the imaging diffraction order, the other orders of diffraction light can be glare, and further the imaging is adversely affected, and the height h of the diffraction structure is such that the 1 st order diffraction can reach the maximum efficiency to reduce the glare phenomenon, and the height h of the diffraction structuredRefractive index difference Δ n ═ n according to the diffraction structure and aird-nAirAnd is determined by scalar diffraction theory calculation, where ndTo refract the refractive index of diffractive optic 310, nAirThe height of the diffractive structure is the height of the diffractive protrusions 312, which is the refractive index of air.
In addition, the diffractive refraction lens 310 can be an integral injection molding structure, that is, the base layer 311 and the diffractive protrusions 312 can be molded together during the manufacturing process, and this manufacturing process has the advantages of simple processing, high production efficiency, and the like.
In the imaging apparatus disclosed in the embodiment of the present application, the second lens mechanism 300 may include a first mirror 300a and a second mirror 300b, the first mirror 300a and the second mirror 300b may be sequentially disposed in a direction approaching the first lens mechanism 200, the second mirror 300b is located between the first mirror 300a and the first lens mechanism 200, and the first mirror 300a or the second mirror 300b is a diffractive mirror 310. In the case where the second mirror 300b is the diffractive mirror 310, the second mirror 300b is positioned between the first mirror 300a and the first lens unit 200, so that the protection can be improved.
As described above, the diffractive refraction mirror 310 includes a plurality of concentrically disposed diffraction protrusions 312, and in the case that the second mirror 300b is the diffractive refraction mirror 310, the light path passes through the first mirror 300a, the diffractive refraction mirror 310, the first lens mechanism 200, and the optical filter 400 in sequence and then projects onto the photosensitive chip 100. In this case, the diffraction protrusions 312 may be located on the side of the second mirror plate 300b facing the first mirror plate 300a (as shown in fig. 4), or the diffraction protrusions 312 may be located on the side of the second mirror plate 300b facing the first lens mechanism 200 (as shown in fig. 3). The orientation of the diffractive protrusions 312 is not limited by the embodiments of the present application.
In the imaging apparatus disclosed in the embodiment of the present application, the total number N of the lenses including the diffractive refraction lens 310 may satisfy that N is greater than or equal to 4 and less than or equal to 9. Wherein, all the lens surfaces of all the lenses at least comprise 4 aspheric surfaces. The camera device disclosed in the embodiment of the present application may include a plurality of refraction and diffraction lenses 310, and the refraction and diffraction lenses 310 are sequentially arranged in the projection direction of the ambient light, so as to realize multiple times of refraction and diffraction, and achieve the purpose of better eliminating chromatic aberration, and the embodiment of the present application does not limit the specific number of the refraction and diffraction lenses 310.
Based on the image pickup device disclosed by the embodiment of the application, the embodiment of the application discloses an electronic device, and the disclosed electronic device comprises the image pickup device.
The electronic device disclosed in the embodiment of the present application may be a smart phone, a micro-camera device, an AR (Augmented Reality) device, a game machine, an electronic book, or the like, and the embodiment of the present application does not limit the specific kind of the electronic device.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

1. An image pickup apparatus, comprising a photosensitive chip (100), a first lens mechanism (200) and a second lens mechanism (300), wherein the first lens mechanism (200) is disposed between the photosensitive chip (100) and the second lens mechanism (300), the second lens mechanism (300) comprises a diffractive refractive lens (310), the diffractive lens (310) comprises a plurality of concentrically disposed diffractive protrusions (312), the diffractive lens (310) and the first lens mechanism (200) are sequentially disposed in a direction of projecting light to the photosensitive chip (100), the image pickup apparatus further comprises an optical filter (400), the optical filter (400) is disposed between the photosensitive chip (100) and the first lens mechanism (200), and ambient light passing through the second lens mechanism (300) can be refracted and diffracted by the diffractive lens (310), and the environment light rays after refraction and diffraction can be projected onto the photosensitive chip (100) through the first lens mechanism (200) and the optical filter (400) in sequence.
2. The imaging device according to claim 1, wherein the diffractive optic (310) is an optical plastic structure.
3. The image pickup apparatus according to claim 1, wherein the refractive index of the diffractive lens (310) is greater than 1.5RIU and less than 1.8 RIU.
4. The imaging apparatus according to claim 1, wherein a distance between tips of two adjacent diffraction projections (312) decreases in a radial direction from a center of the diffractive optic (310) to the center.
5. The imaging device according to claim 4, wherein a distance between tips of two adjacent diffraction projections (312) is greater than 0.5 μm and less than 300 μm.
6. The imaging device according to claim 4, wherein the height of the diffractive protrusions (312) is greater than 0.1 μm and less than 30 μm.
7. The imaging apparatus according to claim 4, wherein the diffractive optic (310) further comprises a base layer (311), and the diffractive protrusions (312) are disposed on the base layer (311).
8. The image pickup apparatus according to claim 7, wherein a center thickness of the base layer (311) is greater than 0.1mm and less than 0.6mm, and an edge thickness of the base layer (311) is greater than 0.1mm and less than 0.5 mm.
9. The image pickup apparatus according to claim 1, wherein said second lens mechanism (300) comprises a first lens piece (300a) and a second lens piece (300b), said first lens piece (300a) and said second lens piece (300b) being arranged in sequence in a direction approaching said first lens mechanism (200), said second lens piece (300b) being located between said first lens piece (300a) and said first lens mechanism (200), said first lens piece (300a) or said second lens piece (300b) being said diffractive lens piece (310).
10. The image pickup apparatus according to claim 9, wherein in a case where said second lens (300b) is said diffractive lens (310), said diffractive protrusions (312) are located on a side of said second lens (300b) facing said first lens (300a), or said diffractive protrusions (312) are located on a side of said second lens (300b) facing said first lens means (200).
11. An electronic apparatus characterized by comprising the image pickup device according to any one of claims 1 to 10.
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