CN219574498U - Optical image capturing device - Google Patents
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- CN219574498U CN219574498U CN202320394192.3U CN202320394192U CN219574498U CN 219574498 U CN219574498 U CN 219574498U CN 202320394192 U CN202320394192 U CN 202320394192U CN 219574498 U CN219574498 U CN 219574498U
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Abstract
The application discloses an optical imaging device, comprising: the lens group sequentially comprises a first lens, a second lens and a third lens with focal power from the human eye side to the image side along the optical axis, wherein the third lens has positive focal power, and any two adjacent lenses from the first lens to the third lens have air intervals on the optical axis; at least one spacer element comprising: a second spacer element located on the near-image side of the second lens and in contact with the near-image side portion of the second lens; and a lens barrel for accommodating the lens group and the at least one spacer element. The optical image capturing device satisfies: 9 < |R5/d2s|+f3/d2m < 34, where d2s is the inner diameter of the near-eye side of the second spacer element, d2m is the inner diameter of the near-image side of the second spacer element, f3 is the effective focal length of the third lens, and R5 is the radius of curvature of the near-eye side of the third lens.
Description
Technical Field
The application relates to the field of optical elements, in particular to an optical imaging device.
Background
Virtual Reality (VR) and augmented Reality (Augmented Reality, AR) are visual Virtual environments which are generated by a computer, interactive and immersive, can be used for generating various Virtual environments according to the needs, and are widely applied to the fields of urban planning, driving training, indoor design and the like.
Since the concept of "meta-universe" was proposed, AR/VR came to the second time of development. The optical imaging device plays an important role as an entrance for human-computer interaction in AR/VR devices, for example. However, current AR/VR devices are relatively bulky, and miniaturization of the AR/VR devices has been an important design requirement. In order to achieve miniaturization of the AR/VR device, in addition to reduction in the size of the housing, the volume of the image capturing apparatus, which is a key component of the AR/VR device, is not neglected. Most manufacturers currently reduce the size of the housing and increase the user experience by making the lenses of the optical imaging device thinner and more compact. However, the more compact optical image capturing device means that the problem of stability of assembly is easy to occur, and various parasitic light, phase difference and the like are also generated, so that the projection quality is seriously affected.
Disclosure of Invention
The present utility model provides such an optical imaging device. The optical imaging device includes: a lens group, at least one spacing element, and a lens barrel for accommodating the lens group and the at least one spacing element. The lens group sequentially comprises a first lens, a second lens and a third lens with focal power from the human eye side to the image side along the optical axis, wherein the third lens has positive focal power, and any two adjacent lenses from the first lens to the third lens have air intervals on the optical axis. The at least one spacer element comprises: and a second spacer element positioned on the near-image side of the second lens and in contact with the near-image side portion of the second lens. The optical image capturing device can satisfy the following conditions: 9 < |R5/d2s|+f3/d2m < 34, where d2s is the inner diameter of the near-eye side of the second spacer element, d2m is the inner diameter of the near-image side of the second spacer element, f3 is the effective focal length of the third lens, and R5 is the radius of curvature of the near-eye side of the third lens.
In one embodiment, at least one of the near-eye side of the first lens to the near-image side of the third lens is an aspherical mirror.
In one embodiment, the at least one spacer element further comprises: a first spacer element located on the near-image side of the first lens and in contact with the near-image side portion of the first lens. The optical image capturing device can satisfy the following conditions: 8 < f1/L-CT1/EP01 < 32, wherein f1 is the effective focal length of the first lens, L is the maximum height of the lens barrel, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the spacing distance from the near-human-eye side end of the lens barrel to the near-human-eye side face of the first spacing element in the direction along the optical axis.
In one embodiment, the optical imaging device may satisfy: 4 < f1×c1/|r6×c1| < 61, where f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element, and R6 is the radius of curvature of the near image side of the third lens.
In one embodiment, the optical imaging device may satisfy: 25 < |D1s/T12-f1/CT1| < 60, wherein D1s is the outer diameter of the near-eye side of the first spacing element, T12 is the air spacing of the first lens and the second lens on the optical axis, f1 is the effective focal length of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
In one embodiment, the optical imaging device may satisfy: -28 < R4/epd+l/TD < -7, wherein R4 is the radius of curvature of the near-image side of the second lens, EPD is the entrance pupil diameter of the optical image capturing device, L is the maximum height of the lens barrel, and TD is the distance on the optical axis between the near-eye side of the first lens and the near-image side of the third lens.
In one embodiment, the optical imaging device may satisfy: -42 < R3/ep01+d2s/TD < 97, where R3 is the radius of curvature of the near-eye side of the second lens, EP01 is the distance between the near-eye side end of the barrel and the near-eye side of the first spacer element in the direction along the optical axis, D2s is the outer diameter of the near-eye side of the second spacer element, and TD is the distance between the near-eye side of the first lens and the near-image side of the third lens in the optical axis.
In one embodiment, the optical imaging device may satisfy: 7 < f/Σcp+f2/d0m < 20, where f is the total effective focal length of the optical imaging apparatus, Σcp is the sum of the maximum thicknesses of the first and second spacing elements, f2 is the effective focal length of the second lens, and d0m is the inner diameter of the lens barrel near the image side end.
In one embodiment, the optical imaging device may satisfy: 0 < (CT1+CT2)/EP 01 < 4, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and EP01 is the distance between the near-human-eye side end of the lens barrel and the near-human-eye side surface of the first spacer element in the direction along the optical axis.
In one embodiment, the optical imaging device may satisfy: 14 < (D1s×d0s)/(f×CT1) < 31, wherein D1s is the outer diameter of the near-eye side surface of the first spacer member, D0s is the inner diameter of the near-eye side end of the lens barrel, f is the total effective focal length of the optical imaging device, and CT1 is the center thickness of the first lens on the optical axis.
In one embodiment, the optical imaging device may satisfy: R5/R6 > 0, wherein R5 is the radius of curvature of the near-eye side of the third lens and R6 is the radius of curvature of the near-image side of the third lens.
In one embodiment, the optical imaging device may satisfy: 11 < L/EP01 x FNo < 34, where L is the maximum height of the barrel, EP01 is the separation distance in the direction along the optical axis between the near-eye side end of the barrel and the near-eye side of the first separation element, and FNo is the relative F-number of the optical imaging device.
In another aspect, the application provides an optical imaging apparatus. The optical imaging device includes: a lens group, at least one spacing element, and a lens barrel for accommodating the lens group and the at least one spacing element. The lens group sequentially comprises a first lens, a second lens and a third lens from the human eye side to the image side along the optical axis, wherein the first lens, the second lens and the third lens all have positive focal power, and any two adjacent lenses in the first lens to the third lens all have air intervals on the optical axis. At least one spacer element comprising: a first spacer element located on the near-image side of the first lens and in contact with the near-image side portion of the first lens; and a second spacer element located on the near-image side of the second lens and in contact with the near-image side portion of the second lens. The optical image capturing device can satisfy the following conditions: 6 < fj/TD+L/ΣCP < 47, where fj is the effective focal length of any one of the first lens, the second lens and the third lens, TD is the distance between the near-eye side of the first lens and the near-image side of the third lens on the optical axis, L is the maximum height of the lens barrel, and ΣCP is the sum of the maximum thicknesses of the first spacer element and the second spacer element.
In one embodiment, the optical imaging device may satisfy: 8 < f1/L-CT1/EP01 < 32, wherein f1 is the effective focal length of the first lens, L is the maximum height of the lens barrel, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the spacing distance from the near-human-eye side end of the lens barrel to the near-human-eye side face of the first spacing element in the direction along the optical axis.
In one embodiment, the optical imaging device may satisfy: 4 < f1×c1/|r6×c1| < 61, where f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element, and R6 is the radius of curvature of the near image side of the third lens.
In one embodiment, the optical imaging device may satisfy: 25 < |D1s/T12-f1/CT1| < 60, wherein D1s is the outer diameter of the near-eye side of the first spacing element, T12 is the air spacing of the first lens and the second lens on the optical axis, f1 is the effective focal length of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
In one embodiment, the optical imaging device may satisfy: -28 < R4/epd+l/TD < -7, wherein R4 is the radius of curvature of the near-image side of the second lens, EPD is the entrance pupil diameter of the optical image capturing device, L is the maximum height of the lens barrel, and TD is the distance on the optical axis between the near-eye side of the first lens and the near-image side of the third lens.
In one embodiment, the optical imaging device may satisfy: -42 < R3/ep01+d2s/TD < 97, where R3 is the radius of curvature of the near-eye side of the second lens, EP01 is the distance between the near-eye side end of the barrel and the near-eye side of the first spacer element in the direction along the optical axis, D2s is the outer diameter of the near-eye side of the second spacer element, and TD is the distance between the near-eye side of the first lens and the near-image side of the third lens in the optical axis.
In one embodiment, the optical imaging device may satisfy: 7 < f/Σcp+f2/d0m < 20, where f is the total effective focal length of the optical imaging apparatus, Σcp is the sum of the maximum thicknesses of the first and second spacing elements, f2 is the effective focal length of the second lens, and d0m is the inner diameter of the lens barrel near the image side end.
In one embodiment, the optical imaging device may satisfy: 0 < (CT1+CT2)/EP 01 < 4, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and EP01 is the distance between the near-human-eye side end of the lens barrel and the near-human-eye side surface of the first spacer element in the direction along the optical axis.
In one embodiment, the optical imaging device may satisfy: 14 < (D1s×d0s)/(f×CT1) < 31, wherein D1s is the outer diameter of the near-eye side surface of the first spacer member, D0s is the inner diameter of the near-eye side end of the lens barrel, f is the total effective focal length of the optical imaging device, and CT1 is the center thickness of the first lens on the optical axis.
In one embodiment, the optical imaging device may satisfy: R5/R6 > 0, wherein R5 is the radius of curvature of the near-eye side of the third lens and R6 is the radius of curvature of the near-image side of the third lens.
In one embodiment, the optical imaging device may satisfy: 11 < L/EP01 x FNo < 34, where L is the maximum height of the barrel, EP01 is the separation distance in the direction along the optical axis between the near-eye side end of the barrel and the near-eye side of the first separation element, and FNo is the relative F-number of the optical imaging device.
In one embodiment of the application, the optical imaging device provided by the application has the characteristics of good assembly stability, less stray light, compact structure and the like by reasonably arranging three lenses, a spacing element and a lens barrel and matching with a third lens, wherein any two adjacent lenses from the first lens to the third lens have positive focal power and air spacing on an optical axis, and 9 < |R5/d2s|+f3/d2m < 34. For example, the present application facilitates light convergence by providing the third lens with positive optical power, thereby facilitating reduction in screen size. By controlling the inner diameters of the two sides of the second interval element, stray light in the optical imaging device can be reduced, the bearing relation among the second lens, the second interval element and the third lens can be reasonably controlled, and the improvement of the assembly stability of the optical imaging device is facilitated.
In another embodiment of the present application, by reasonably arranging three lenses, a spacing element and a lens barrel, and matching the three lenses, any two adjacent lenses of the first lens to the third lens have positive focal power, all have air spacing on the optical axis, and 6 < fj/TD+L/ΣCP < 47, the optical imaging device provided by the present application has the characteristics of good assembly stability, less parasitic light, compact structure, etc. For example, by reasonably setting the focal power of each lens, the focal power of the optical imaging device can be effectively distributed, and the aberration of the device can be corrected and the imaging quality of the device can be improved on the premise of meeting a certain focal length of the device. Meanwhile, the thickness of all the spacing elements can be controlled, so that the spacing elements are not too thin, the strength of the spacing elements is ensured, the spacing elements are not too thick, and the thickness of a lens mechanism area (namely a non-optical area) is ensured on the premise of ensuring a certain body height.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1A and 1B are schematic structural views of an optical image capturing device according to two embodiments of example 1;
FIG. 1C is a schematic view of a part of the optical path of the optical imaging apparatus in embodiment 1;
fig. 2A to 2C show an on-axis chromatic aberration curve, an astigmatic curve, and a relative illuminance curve of the optical imaging apparatus of embodiment 1, respectively;
fig. 3A to 3C are schematic structural views of an optical image capturing device according to three embodiments of example 2;
FIG. 3D is a schematic view of a part of the optical path of the optical imaging apparatus in embodiment 2;
fig. 4A to 4C show an on-axis chromatic aberration curve, an astigmatic curve, and a relative illuminance curve of the optical imaging apparatus of embodiment 2, respectively;
fig. 5A is a schematic structural view of an optical imaging apparatus in embodiment 3;
FIG. 5B is a schematic view of a part of the optical path of the optical imaging apparatus in embodiment 3;
fig. 6A to 6C show an on-axis chromatic aberration curve, an astigmatic curve, and a relative illuminance curve of the optical imaging apparatus of embodiment 3, respectively; and
fig. 7 is a schematic view of a part of parameters of an optical imaging apparatus according to an embodiment of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Thus, a first lens discussed below may also be referred to as a second lens or a third lens, and a first spacer element may also be referred to as a second spacer element, without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the eye side (i.e., the image side) is referred to as the near eye side of the lens, and the surface of each lens closest to the image side (i.e., the image source side) is referred to as the near image side of the lens. It will be appreciated that the surface of each spacer element closest to the image side is referred to as the near-image side of the spacer element, and the surface of each spacer element closest to the human eye side is referred to as the near-human eye side of the spacer element. The surface of the lens barrel closest to the image side is referred to as the near-image side end of the lens barrel, and the surface of the lens barrel closest to the human eye side is referred to as the near-human eye side end of the lens barrel.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which are all within the scope of the present application, for example, the lens group (i.e., the first lens to the third lens) of each embodiment of the present application, the lens barrel structure, and the spacer element may be arbitrarily combined, and the lens group of one embodiment is not limited to be combined with the lens barrel structure, the spacer element, and the like of the embodiment. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical image pickup apparatus according to an exemplary embodiment of the present application may be used as a projection lens, which may include three lenses having optical power, a first lens, a second lens, and a third lens, respectively. The three lenses are arranged in order along the optical axis from the human eye side to the image side. Any two adjacent lenses in the first lens to the third lens can have a spacing distance.
According to an exemplary embodiment of the present application, each of the first to third lenses may have an optical region for optical imaging and a non-optical region extending outward from an outer circumference of the optical region. In general, an optical region refers to a region of a lens for optical imaging, and a non-optical region is a structural region of the lens. During assembly of the optical imaging device, spacer elements may be provided at the non-optical regions of the respective lenses by a process such as spot-gluing and the like and the respective lenses may be coupled into the barrel, respectively. In the image capturing process of the optical image capturing device, the optical area of each lens can transmit light from the eye side (i.e. the image source side) to form an optical path, so as to form a final optical image; the non-optical area of each lens after assembly is accommodated in the lens barrel which cannot transmit light, so that the non-optical area does not directly participate in the image capturing process of the optical image capturing device. It should be noted that for ease of description, the application is described with the individual lenses being divided into two parts, an optical region and a non-optical region, but it should be understood that both the optical region and the non-optical region of the lens may be formed as a single piece during manufacture rather than as separate two parts.
The optical image capturing device according to an exemplary embodiment of the present application may include two spacing elements, respectively a first spacing element and a second spacing element, respectively, between the first lens to the third lens. In particular, the optical imaging device may include a first spacer element between the first lens and the second lens that may abut a non-optical region of the near-image side of the first lens; a second spacer element between the second lens and the third lens, which may abut against a non-optical region of the near image plane of the second lens. For example, the first spacer element may be in contact with a non-optical region of the near image side of the first lens and may be in contact with a non-optical region of the near eye side of the second lens. For example, the near-eye side of the first spacer element may be in contact with a non-optical region of the near-image side of the first lens, and the near-image side of the first spacer element may be in contact with a non-optical region of the near-eye side of the second lens. Similarly, the near-eye side of the second spacer element may be in contact with a non-optical region of the near-image side of the second lens, and the near-image side of the second spacer element may be in contact with a non-optical region of the near-eye side of the third lens.
An optical imaging apparatus according to an exemplary embodiment of the present application may include a lens barrel accommodating a lens group and at least one spacer element. The lens barrel may be an integrated lens barrel for accommodating the first to third lenses and the first and second spacing elements, for example.
According to the exemplary embodiment of the application, the first spacing element and the second spacing element can comprise at least one spacing piece, and the number, the thickness, the inner diameter and the outer diameter of the spacing pieces are reasonably arranged, so that the assembly of the optical imaging device is improved, the shielding of stray light is facilitated, and the imaging quality of the optical imaging device is improved.
In an exemplary embodiment, the third lens may have positive optical power, and any adjacent two lenses of the first to third lenses have an air space on the optical axis. The optical imaging device according to the present application can satisfy: 9 < |R5/d2s|+f3/d2m < 34, where d2s is the inner diameter of the near-eye side of the second spacer element, d2m is the inner diameter of the near-image side of the second spacer element, f3 is the effective focal length of the third lens, and R5 is the radius of curvature of the near-eye side of the third lens. In the application, through the reasonable arrangement of the three lenses, the spacing element and the lens barrel and matching with the third lens, the optical imaging device has the characteristics of good assembly stability, less parasitic light, compact structure and the like, and any two adjacent lenses from the first lens to the third lens have air spacing on the optical axis, and 9 < |R5/d2s|+f3/d2m < 34. For example, the present application facilitates light convergence by providing the third lens with positive optical power, thereby facilitating reduction in screen size. By controlling the inner diameters of the two sides of the second interval element, stray light in the optical imaging device can be reduced, the bearing relation among the second lens, the second interval element and the third lens can be reasonably controlled, and the improvement of the assembly stability of the optical imaging device is facilitated.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 8 < f1/L-CT1/EP01 < 32, wherein f1 is the effective focal length of the first lens, L is the maximum height of the lens barrel, i.e., the furthest distance in the direction along the optical axis from the near-eye side end of the lens barrel to the near-image side end of the lens barrel, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the separation distance in the direction along the optical axis from the near-eye side end of the lens barrel to the near-eye side surface of the first separation element. The method satisfies the conditions that f1/L-CT1/EP01 is less than 32 and is more favorable for determining the attaching position of the brightness enhancement film by controlling the effective focal length of the first lens to control the shape of the first lens; the wall thickness of the near-eye side end of the lens barrel and the mechanical diameter thickness of the first spacing element can be controlled by controlling the distance between the near-eye side end of the lens barrel and the near-eye side surface of the first spacing element, so that the lens barrel and the spacing element can be molded easily; the maximum height of the lens barrel can be controlled to be smaller, so that the whole lens group is more compact, and the miniaturization design is realized.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 4 < f1×c1/|r6×c1| < 61, where f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element, and R6 is the radius of curvature of the near image side of the third lens. Satisfies 4 < f1×CT1/|R6×CP1| < 61, and can correct the aberration of the optical imaging device by controlling the effective focal length of the first lens and the curvature radius of the third lens near the image side; the assembly stability of the first lens and the first spacing element can be improved by controlling the medium thickness of the first lens and the maximum thickness of the first spacing element, and the deformation of the first lens and the first spacing element after assembly is reduced.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 25 < |D1s/T12-f1/CT1| < 60, wherein D1s is the outer diameter of the near-eye side of the first spacing element, T12 is the air spacing of the first lens and the second lens on the optical axis, f1 is the effective focal length of the first lens, and CT1 is the center thickness of the first lens on the optical axis. Satisfies 25 < |D1s/T12-f1/CT1| < 60, the overall height of the lens group can be reduced by controlling the interval between the first lens and the second lens, and the outer diameter of the first interval element near the side surface of human eyes can be controlled at the same time, so that the miniaturization of the optical imaging device is facilitated.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: -28 < R4/epd+l/TD < -7, wherein R4 is the radius of curvature of the near-image side of the second lens, EPD is the entrance pupil diameter of the optical image capturing device, L is the maximum height of the lens barrel, and TD is the distance on the optical axis between the near-eye side of the first lens and the near-image side of the third lens. Satisfies R4/EPD+L/TD < -7 > and can satisfy ergonomics by controlling the entrance pupil diameter of the optical imaging device, and the device is favorable for improving the immersion experience of the VR lens when being loaded in the VR lens; meanwhile, the height of the lens group and the height of the lens barrel can be controlled to ensure that the height dimension of the lens barrel is as small as possible, thereby reducing the size of the whole machine.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: -42 < R3/ep01+d2s/TD < 97, where R3 is the radius of curvature of the near-eye side of the second lens, EP01 is the distance between the near-eye side end of the barrel and the near-eye side of the first spacer element in the direction along the optical axis, D2s is the outer diameter of the near-eye side of the second spacer element, and TD is the distance between the near-eye side of the first lens and the near-image side of the third lens in the optical axis. The curvature radius of the side face of the second lens close to the human eye and the outer diameter of the side face of the second spacing element close to the human eye can be reasonably controlled to satisfy the condition that R < 42/EP < 01+D2s/TD < 97, and when the surface of the second lens is coated, the difficulty of the film coating process can be reduced by controlling the curvature of the surface of the second lens.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 7 < f/Σcp+f2/d0m < 20, where f is the total effective focal length of the optical imaging apparatus, Σcp is the sum of the maximum thicknesses of the first and second spacing elements, f2 is the effective focal length of the second lens, and d0m is the inner diameter of the lens barrel near the image side end. The total effective focal length of the optical imaging device can be controlled to effectively control the view angle of the device by satisfying 7 < f/ΣCPf2/d 0m < 20, so that the device satisfies the characteristic of large view field; in addition, the mechanism diameter thickness of the lens group can be indirectly controlled by controlling the sum of all the interval elements, thereby being beneficial to improving the assembly performance.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 0 < (CT1+CT2)/EP 01 < 4, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and EP01 is the distance between the near-human-eye side end of the lens barrel and the near-human-eye side surface of the first spacer element in the direction along the optical axis. Satisfying 0 < (CT1+CT2)/EP 01 < 4, the thickness ratio of the first lens can be ensured by controlling the center thickness of the first lens and the second lens and the distance from the side end of the lens barrel near the human eye to the side surface of the first spacing element near the human eye, thereby being beneficial to the molding of the first lens and the second lens.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 14 < (D1s×d0s)/(f×CT1) < 31, wherein D1s is the outer diameter of the near-eye side surface of the first spacer member, D0s is the inner diameter of the near-eye side end of the lens barrel, f is the total effective focal length of the optical imaging device, and CT1 is the center thickness of the first lens on the optical axis. Satisfying the requirement that (D1 s multiplied by D0 s)/(f multiplied by CT 1) is less than 31, the length of the bearing end surface of the lens barrel can be reasonably controlled by controlling the outer diameter of the side surface of the first spacing element near the human eye and the inner diameter of the side end of the lens barrel near the human eye, thereby being beneficial to improving the stability of the first lens assembly.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: R5/R6 > 0, wherein R5 is the radius of curvature of the near-eye side of the third lens and R6 is the radius of curvature of the near-image side of the third lens. Satisfying R5/R6 > 0, the focal power of the third lens can be controlled by controlling the curvature radius of the near-human eye side surface and the near-image side surface of the third lens, thereby being beneficial to correcting the aberration of the optical image capturing device.
In an exemplary embodiment, the optical imaging apparatus according to the present application may satisfy: 11 < L/EP01 x FNo < 34, where L is the maximum height of the barrel, EP01 is the separation distance in the direction along the optical axis between the near-eye side end of the barrel and the near-eye side of the first separation element, and FNo is the relative F-number of the optical imaging device. The optical imaging device meets the requirements of 11 < L/EP 01X FNo < 34, and can meet the characteristic of large field angle by indirectly controlling the focal length of the device on the premise of a certain human eye entrance pupil size by controlling the relative F number of the optical imaging device.
In an exemplary embodiment, the first lens, the second lens, and the third lens each have positive optical power, and any adjacent two lenses of the first lens to the third lens each have an air space on the optical axis. The optical imaging device according to the present application can satisfy: 6 < fj/TD+L/ΣCP < 47, where fj is the effective focal length of any one of the first lens, the second lens and the third lens, TD is the distance between the near-eye side of the first lens and the near-image side of the third lens on the optical axis, L is the maximum height of the lens barrel, and ΣCP is the sum of the maximum thicknesses of the first spacer element and the second spacer element. For example, the optical imaging apparatus according to the present application can satisfy: 6 < f1/TD+L/ΣCPs < 47, 6 < f2/TD+L/ΣCPs < 47, and 6 < f3/TD+L/ΣCPs < 47, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. In the application, through the reasonable arrangement of the three lenses, the spacing element and the lens barrel and matching of the three lenses, the optical imaging device has the characteristics of good assembly stability, less parasitic light, compact structure and the like, and any two adjacent lenses from the first lens to the third lens have air spacing on the optical axis, and 6 < fj/TD+L/ΣCP < 47. For example, by reasonably setting the focal power of each lens, the focal power of the optical imaging device can be effectively distributed, and the aberration of the device can be corrected and the imaging quality of the device can be improved on the premise of meeting a certain focal length of the device. Meanwhile, the thickness of all the spacing elements can be controlled, so that the spacing elements are not too thin, the strength of the spacing elements is ensured, the spacing elements are not too thick, and the thickness of a lens mechanism area (namely a non-optical area) is ensured on the premise of ensuring a certain body height.
In an exemplary embodiment, the optical image capturing device according to the present application further includes a diaphragm (not shown) disposed on the human eye side. Optionally, the optical image capturing device may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the image side.
The optical imaging device according to the above embodiment of the present application may employ a plurality of lenses, for example, three lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the optical image capturing device can be effectively reduced, and the processability of the optical image capturing device can be improved, so that the optical image capturing device is more beneficial to production and processing and is applicable to portable electronic products. The optical imaging device with the configuration has the characteristics of small size, light weight, good assembly stability, less stray light, compact structure, good imaging quality and the like, and can well meet the use requirements of various portable electronic products such as VR equipment under a projection scene. In the optical imaging device according to the above embodiment of the present application, the spacer is provided between the adjacent lenses and the inner and outer diameters of the spacer are designed according to the optical path, so that stray light can be effectively blocked and eliminated, and the imaging quality of the optical imaging device can be improved.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the near-eye side of the first lens to the near-image side of the third lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration generated during projection can be eliminated as much as possible, and projection quality can be improved. Optionally, at least one of the near-eye side and the near-image side of each of the first lens, the second lens, and the third lens is an aspherical mirror. Optionally, the near-eye side and the near-image side of each of the first lens, the second lens, and the third lens are aspherical mirrors.
However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging device can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although three lenses are described as an example in the embodiment, the optical imaging apparatus is not limited to including three lenses. The optical imaging device may also include other numbers of lenses, if desired.
Specific examples of the optical imaging apparatus applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical image capturing apparatus according to embodiment 1 of the present application is described below with reference to fig. 1A to 2C. Fig. 1A and 1B show the optical imaging apparatus in two embodiments of example 1, respectively. Fig. 1C is a schematic view of a part of the optical path of the optical imaging apparatus according to embodiment 1 of the present application.
As shown in fig. 1A and 1B, the optical imaging apparatus sequentially includes, from a human eye side to an image side: a stop STO (not shown) a first lens E1, a second lens E2, a third lens E3.
The first lens E1 has positive power, and its near-eye side surface S1 is convex and the near-image side surface S2 is planar. The second lens E2 has positive power, and its near-eye side surface S3 is convex and its near-image side surface S4 is convex. The third lens E3 has positive power, and its near-eye side surface S5 is concave and its near-image side surface S6 is convex.
As shown in fig. 1C, after light from the image side sequentially passes through the surfaces S7 to S3 and reaches the surface S2, first reflection occurs on the surface S2. After the light reflected first passes through the surfaces S3 to S5 in order and reaches the surface S6, the second reflection occurs on the surface S6. The light reflected a second time passes through the surfaces S5 to S1 in sequence and is finally projected onto a target object (not shown) in space. For example, when the optical image capturing device is mounted on an electronic device such as VR, light from the image side sequentially passes through the surfaces S7 to S3 to the surface S2, then sequentially passes through the surfaces S3 to S5 to the surface S6 via the surface S2, then sequentially passes through the surfaces S5 to S1 via the surface S6 and finally is projected into the eyes of the experimenter.
Table 1 shows a basic parameter table of the optical imaging apparatus of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In this example, the total effective focal length F of the optical image capturing device is 20.88mm, the relative F-number Fno of the optical image capturing device is 4.58, and the entrance pupil diameter EPD of the optical image capturing device is 5.00mm.
As shown in fig. 1A and 1B, the optical image capturing device may include two spacing elements, a first spacing element P1 and a second spacing element P2, respectively, located between the first lens and the third lens. The optical image pickup apparatus may further include a lens barrel accommodating the first to third lenses and the first and second spacing elements.
Table 2 shows the structure parameter table of each spacer element in two embodiments in the optical imaging apparatus of example 1, wherein each structure parameter in table 2 has a unit of millimeter (mm).
| Structural parameters | Embodiment 1 | Embodiment 2 |
| d1m | 49.34 | 50.06 |
| D1s | 48.39 | 50.43 |
| d2s | 50.60 | 49.92 |
| d2m | 50.60 | 49.92 |
| D2s | 55.60 | 55.60 |
| d0s | 47.40 | 52.63 |
| d0m | 56.50 | 57.32 |
| EP01 | 2.80 | 2.59 |
| CP1 | 2.26 | 2.26 |
| CP2 | 0.23 | 0.20 |
| L | 13.00 | 11.50 |
| ∑CP | 2.48 | 2.46 |
TABLE 2
It should be understood that in this example, the structures and parameters of each spacer element are merely exemplified for two embodiments, and the specific structures and actual parameters of each spacer element are not explicitly defined. The specific structure and the actual parameters of the individual spacer elements may be set in any suitable manner in the actual production.
In embodiment 1, the near-eye side and the near-image side of any one of the first lens E1 to the third lens E3 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 3 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S6 in example 1 4 、A 6 、A 8 And A 10 。
TABLE 3 Table 3
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging apparatus of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging apparatus. Fig. 2B shows an astigmatism curve of the optical imaging apparatus of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a relative illuminance curve of the optical imaging apparatus of embodiment 1, which represents relative illuminance magnitude values corresponding to different angles of view. As can be seen from fig. 2A to 2C, the optical imaging device according to embodiment 1 can achieve good imaging quality.
Example 2
An optical image capturing apparatus according to embodiment 2 of the present application is described below with reference to fig. 3A to 4C. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3A to 3C show the optical imaging apparatuses in the three embodiments of example 2, respectively. Fig. 3D is a schematic view of a part of the optical path of the optical imaging apparatus according to embodiment 2 of the present application.
As shown in fig. 3A to 3C, the optical image capturing device sequentially includes, from a human eye side to an image side: a stop STO (not shown) a first lens E1, a second lens E2, a third lens E3.
The first lens E1 has positive power, and its near-eye side surface S1 is convex and the near-image side surface S2 is planar. The second lens E2 has positive power, and its near-eye side surface S3 is convex and its near-image side surface S4 is convex. The third lens E3 has positive power, and its near-eye side surface S5 is concave and its near-image side surface S6 is convex.
As shown in fig. 3D, after light from the image side sequentially passes through the surfaces S7 to S3 and reaches the surface S2, first reflection occurs on the surface S2. After the light reflected first passes through the surfaces S3 and S4 in sequence and reaches the surface S5, a second reflection occurs on the surface S5. The light reflected a second time passes through the surfaces S4 to S1 in sequence and is finally projected onto a target object (not shown) in space. For example, when the optical image capturing device is mounted on an electronic apparatus such as VR, light from the image side sequentially passes through the surfaces S7 to S3 to the surface S2, then sequentially passes through the surfaces S3 and S4 to the surface S5 via the surface S2, then sequentially passes through the surfaces S4 to S1 via the surface S5 and finally is projected into the eyes of the experimenter.
In this example, the total effective focal length F of the optical image capturing device is 22.74mm, the relative F-number Fno of the optical image capturing device is 4.55, and the entrance pupil diameter EPD of the optical image capturing device is 5.00mm.
As shown in fig. 3A to 3C, the optical image capturing device may include two spacing elements, a first spacing element P1 and a second spacing element P2, respectively, located between the first lens and the third lens. The optical image pickup apparatus may further include a lens barrel accommodating the first to third lenses and the first and second spacing elements.
It should be understood that in this example, the structures and parameters of each spacer element are merely exemplified for three embodiments, and the specific structures and actual parameters of each spacer element are not explicitly defined. The specific structure and the actual parameters of the individual spacer elements may be set in any suitable manner in the actual production.
Table 4 shows a basic parameter table of the optical imaging apparatus of example 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 5 shows the structure parameter table of each spacer element in two embodiments in the optical imaging apparatus of example 2, wherein each structure parameter in table 5 has a unit of millimeter (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 4 Table 4
| Structural parameters | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| d1m | 47.98 | 46.93 | 49.74 |
| D1s | 54.40 | 58.27 | 53.26 |
| d2s | 50.08 | 51.18 | 50.08 |
| d2m | 54.20 | 57.67 | 51.56 |
| D2s | 51.56 | 53.05 | 53.57 |
| d0s | 49.61 | 59.96 | 49.62 |
| d0m | 57.45 | 60.72 | 57.45 |
| EP01 | 5.11 | 6.08 | 3.67 |
| CP1 | 0.20 | 0.20 | 2.55 |
| CP2 | 2.61 | 2.61 | 2.61 |
| L | 17.50 | 16.50 | 17.50 |
| ∑CP | 2.81 | 2.81 | 5.15 |
TABLE 5
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging apparatus of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging apparatus. Fig. 4B shows an astigmatism curve of the optical imaging apparatus of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a relative illuminance curve of the optical imaging apparatus of embodiment 2, which represents relative illuminance magnitude values corresponding to different angles of view. As can be seen from fig. 4A to 4C, the optical imaging device according to embodiment 2 can achieve good imaging quality.
Example 3
An optical image capturing apparatus according to embodiment 3 of the present application is described below with reference to fig. 5A to 6C. Fig. 5A shows an optical imaging device in embodiment 3. Fig. 5B is a schematic view of a part of the optical path of the optical imaging apparatus according to embodiment 3 of the present application.
As shown in fig. 5A, the optical image capturing device sequentially includes, from a human eye side to an image side: a stop STO (not shown) a first lens E1, a second lens E2, a third lens E3.
The first lens E1 has positive power, and its near-eye side surface S1 is a plane and its near-image side surface S2 is a convex surface. The second lens E2 has positive power, and its near-eye side S3 is concave and near-image side S4 is convex. The third lens E3 has positive power, and its near-eye side surface S5 is concave and its near-image side surface S6 is convex.
As shown in fig. 5B, after light from the image side sequentially passes through the surfaces S7 to S2 and reaches the surface S1, the first reflection occurs on the surface S1. After the light reflected first passes through the surfaces S2 to S5 in order and reaches the surface S6, the second reflection occurs on the surface S6. The light reflected a second time passes through the surfaces S5 to S1 in sequence and is finally projected onto a target object (not shown) in space. For example, when the optical image capturing device is mounted on an electronic device such as VR, light from the image side sequentially passes through the surfaces S7 to S2 to the surface S1, then sequentially passes through the surfaces S2 to S5 to the surface S6 via the surface S1, then sequentially passes through the surfaces S5 to S1 via the surface S6 and finally is projected into the eyes of the experimenter.
In this example, the total effective focal length F of the optical image capturing device is 22.93mm, the relative F-number Fno of the optical image capturing device is 4.59, and the entrance pupil diameter EPD of the optical image capturing device is 5.00mm.
As shown in fig. 5A, the optical image capturing device may include two spacing elements, a first spacing element P1 and a second spacing element P2, respectively, located between the first lens and the third lens. The optical image pickup apparatus may further include a lens barrel accommodating the first to third lenses and the first and second spacing elements.
It should be understood that in this example, the structures and parameters of the spacer elements in one embodiment are merely exemplified, and the specific structures and actual parameters of the spacer elements are not explicitly defined. The specific structure and the actual parameters of the individual spacer elements may be set in any suitable manner in the actual production.
Table 7 shows a basic parameter table of the optical imaging apparatus of example 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows a table of structural parameters of each spacer element in one embodiment of the optical imaging apparatus of example 3, wherein each structural parameter in table 8 is in millimeters (mm). Table 9 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 7
| Structural parameters | Embodiment 1 |
| d1m | 49.73 |
| D1s | 53.40 |
| d2s | 48.55 |
| d2m | 48.55 |
| D2s | 55.60 |
| d0s | 48.59 |
| d0m | 56.50 |
| EP01 | 1.97 |
| CP1 | 3.20 |
| CP2 | 0.20 |
| L | 14.00 |
| ∑CP | 3.40 |
TABLE 8
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging apparatus of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging apparatus. Fig. 6B shows an astigmatism curve of the optical imaging apparatus of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a relative illuminance curve of the optical imaging apparatus of embodiment 3, which represents relative illuminance magnitude values corresponding to different angles of view. As can be seen from fig. 6A to 6C, the optical imaging device according to embodiment 3 can achieve good imaging quality.
In summary, examples 1 to 3 satisfy the relationships shown in table 10, respectively.
Table 10
The present application also provides a projection apparatus, which may be a stand-alone projection device such as a projector, or may be a projection module integrated on a mobile electronic device such as a VR. The projection device is equipped with the optical imaging device described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (22)
1. An optical imaging device, comprising:
the lens group sequentially comprises a first lens, a second lens and a third lens with focal power from the human eye side to the image side along an optical axis, wherein the third lens has positive focal power, and any two adjacent lenses from the first lens to the third lens have air intervals on the optical axis;
At least one spacer element comprising: a second spacing element located on the near-image side of the second lens and in contact with the near-image side portion of the second lens; and
a lens barrel for accommodating the lens group and the at least one spacer element;
wherein, the optical image capturing device satisfies: 9 < |R5/d2s|+f3/d2m < 34, wherein d2s is the inner diameter of the near-eye side of the second spacer element, d2m is the inner diameter of the near-image side of the second spacer element, f3 is the effective focal length of the third lens, and R5 is the radius of curvature of the near-eye side of the third lens.
2. The optical imaging device of claim 1, wherein the at least one spacer element further comprises: a first spacing element located on the near-image side of the first lens and in contact with the near-image side portion of the first lens,
the optical image capturing device satisfies: 8 < f1/L-CT1/EP01 < 32, wherein f1 is an effective focal length of the first lens, L is a maximum height of the lens barrel, CT1 is a center thickness of the first lens on the optical axis, and EP01 is a separation distance from a near-human-eye side end of the lens barrel to a near-human-eye side surface of the first separation element in a direction along the optical axis.
3. The optical imaging device of claim 2, wherein the optical imaging device satisfies: 4 < f1×c1/|r6×c1| < 61, where CP1 is the maximum thickness of the first spacing element and R6 is the radius of curvature of the near image side of the third lens.
4. The optical imaging device of claim 2, wherein the optical imaging device satisfies: 25 < |D1s/T12-f1/CT1| < 60, wherein D1s is the outer diameter of the near-eye side of the first spacing element and T12 is the air spacing of the first and second lenses on the optical axis.
5. The optical imaging device of claim 1, wherein the optical imaging device satisfies: -28 < R4/epd+l/TD < -7, wherein R4 is the radius of curvature of the near-image side of the second lens, EPD is the entrance pupil diameter of the optical image capturing device, L is the maximum height of the lens barrel, and TD is the distance between the near-eye side of the first lens and the near-image side of the third lens on the optical axis.
6. The optical imaging device of claim 2, wherein the optical imaging device satisfies: -42 < R3/ep01+d2s/TD < 97, where R3 is the radius of curvature of the near-eye side of the second lens, D2s is the outer diameter of the near-eye side of the second spacer element, and TD is the distance between the near-eye side of the first lens and the near-image side of the third lens on the optical axis.
7. The optical imaging device of claim 2, wherein the optical imaging device satisfies: 7 < f/Σcp+f2/d0m < 20, where f is the total effective focal length of the optical imaging device, Σcp is the sum of the maximum thicknesses of the first and second spacing elements, f2 is the effective focal length of the second lens, and d0m is the inner diameter of the near-image-side end of the barrel.
8. The optical imaging device of claim 2, wherein the optical imaging device satisfies: 0 < (CT1+CT2)/EP 01 < 4, wherein CT2 is the center thickness of the second lens on the optical axis.
9. The optical imaging device of claim 2, wherein the optical imaging device satisfies: 14 < (d1s×d0s)/(f×ct1) < 31, wherein D1s is an outer diameter of a near-human eye side surface of the first spacer element, D0s is an inner diameter of a near-human eye side end of the lens barrel, and f is a total effective focal length of the optical imaging device.
10. The optical imaging device according to any one of claims 1 to 9, wherein the optical imaging device satisfies: R5/R6 > 0, wherein R6 is the radius of curvature of the near image side of the third lens.
11. The optical imaging device of claim 2, wherein the optical imaging device satisfies: 11 < L/EP 01X FNo < 34, wherein FNo is the relative F-number of the optical imaging device.
12. An optical imaging device, comprising:
the lens group sequentially comprises a first lens, a second lens and a third lens from the human eye side to the image side along an optical axis, wherein the first lens, the second lens and the third lens all have positive focal power, and any two adjacent lenses from the first lens to the third lens have air intervals on the optical axis;
at least one spacer element comprising:
a first spacing element located on the near-image side of the first lens and in contact with the near-image side portion of the first lens; and
a second spacing element located on the near-image side of the second lens and in contact with the near-image side portion of the second lens;
a lens barrel for accommodating the lens group and the at least one spacer element;
wherein, the optical image capturing device satisfies: 6 < fj/TD+L/ΣCPs < 47, wherein fj is the effective focal length of any one of the first lens, the second lens and the third lens, TD is the separation distance on the optical axis between the near-human eye side of the first lens and the near-image side of the third lens, L is the maximum height of the lens barrel, and ΣCPs is the sum of the maximum thicknesses of the first and second spacing elements.
13. The optical imaging device of claim 12, wherein the optical imaging device satisfies: 8 < f1/L-CT1/EP01 < 32, wherein f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the spacing distance from the near-human-eye side end of the lens barrel to the near-human-eye side of the first spacing element in the direction along the optical axis.
14. The optical imaging device of claim 12, wherein the optical imaging device satisfies: 4 < f1×ct1/|r6×cp1| < 61, wherein f1 is an effective focal length of the first lens, CT1 is a center thickness of the first lens on the optical axis, CP1 is a maximum thickness of the first spacer element, and R6 is a radius of curvature of a near image side of the third lens.
15. The optical imaging device of claim 12, wherein the optical imaging device satisfies: 25 < |D1s/T12-f1/CT1| < 60, wherein D1s is the outer diameter of the near-eye side of the first spacer element, T12 is the air separation of the first lens and the second lens on the optical axis, f1 is the effective focal length of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
16. The optical imaging device of claim 12, wherein the optical imaging device satisfies: -28 < R4/epd+l/TD < -7, wherein R4 is the radius of curvature of the near image side of the second lens and EPD is the entrance pupil diameter of the optical imaging device.
17. The optical imaging device of claim 12, wherein the optical imaging device satisfies: -42 < R3/ep01+d2s/TD < 97, wherein R3 is the radius of curvature of the eye-proximal side of the second lens, EP01 is the distance from the eye-proximal side end of the barrel to the eye-proximal side of the first spacer element in the direction along the optical axis, and D2s is the outer diameter of the eye-proximal side of the second spacer element.
18. The optical imaging device of claim 12, wherein the optical imaging device satisfies: 7 < f/ΣCPf2/d 0m < 20, wherein f is the total effective focal length of the optical imaging device, f2 is the effective focal length of the second lens, and d0m is the inner diameter of the near-image side end of the lens barrel.
19. The optical imaging device of claim 12, wherein the optical imaging device satisfies: 0 < (CT1+CT2)/EP 01 < 4, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and EP01 is the distance from the near-human-eye side end of the lens barrel to the near-human-eye side surface of the first spacer element in the direction along the optical axis.
20. The optical imaging device of claim 12, wherein the optical imaging device satisfies: 14 < (d1s×d0s)/(f×ct1) < 31, wherein D1s is an outer diameter of a near-human eye side surface of the first spacer element, D0s is an inner diameter of a near-human eye side end of the lens barrel, f is a total effective focal length of the optical imaging device, and CT1 is a center thickness of the first lens on the optical axis.
21. The optical imaging device of any of claims 12-20, wherein the optical imaging device satisfies: R5/R6 > 0, wherein R5 is the radius of curvature of the near-eye side of the third lens and R6 is the radius of curvature of the near-image side of the third lens.
22. The optical imaging device of any of claims 12-20, wherein the optical imaging device satisfies: 11 < L/EP01 x FNo < 34, wherein EP01 is a separation distance between a near-human eye side end of the lens barrel and a near-human eye side surface of the first separation element in a direction along the optical axis, and FNo is a relative F number of the optical image pickup device.
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