CN116909076A - Optical imaging system - Google Patents
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- CN116909076A CN116909076A CN202311166694.1A CN202311166694A CN116909076A CN 116909076 A CN116909076 A CN 116909076A CN 202311166694 A CN202311166694 A CN 202311166694A CN 116909076 A CN116909076 A CN 116909076A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 129
- 238000003384 imaging method Methods 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims abstract description 34
- 230000014509 gene expression Effects 0.000 claims description 12
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000004075 alteration Effects 0.000 description 35
- 238000010586 diagram Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/023—Catoptric systems, e.g. image erecting and reversing system for extending or folding an optical path, e.g. delay lines
Abstract
The present invention provides an optical imaging system comprising, in order from an object side to an imaging surface along an optical axis: a first prism having optical power, the first prism including at least a first entrance face, a first exit face, and a first reflective face; a second prism having optical power, the second prism including at least a second entrance face, a second exit face, and a second reflection face; the light transmitted through the first incidence surface enters the first prism, is reflected by the first reflection surface, the reflected light is transmitted through the first emergent surface to exit the first prism, the light enters the second prism after reaching the second incidence surface, is reflected by the second reflection surface, and the reflected light is transmitted through the second emergent surface to exit the second prism. The optical imaging system provided by the invention can realize imaging by adopting the two prisms with optical power, so that the structure of the optical imaging system is more compact, and the optical imaging system has the advantages of long focal length, short depth, low sensitivity and high pixel.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical imaging system.
Background
Along with the continuous rapid development of social science and technology, in order to meet different shooting scenes, the requirements of people on cameras are higher and higher, and particularly, the requirements of shooting lovers on long-focus lenses are obvious. Most of the long-focus lenses in the market have long total length, large volume or use a conventional triangular prism to fold the light path, so that the good products are low, the manufacturing process is difficult and the reliability is poor.
Disclosure of Invention
Therefore, the invention aims to provide an optical imaging system which has at least the advantages of long focal length, short depth and high pixel.
The present invention provides an optical imaging system comprising, in order from an object side to an imaging surface along an optical axis: a first prism having optical power, the first prism including at least a first entrance face, a first exit face, and a first reflective face; a second prism having optical power, the second prism including at least a second entrance face, a second exit face, and a second reflection face; the light transmitted through the first incidence surface enters the first prism, is reflected by the first reflection surface, the reflected light is transmitted through the first emergent surface to exit the first prism, the light enters the second prism after reaching the second incidence surface, is reflected by the second reflection surface, and the reflected light is transmitted through the second emergent surface to exit the second prism.
Compared with the prior art, the optical imaging system provided by the invention has the advantages of at least long focal length, short depth, low sensitivity and high pixel, and can better meet the shooting requirement while the structure of the optical imaging system is more compact by adopting two prisms with focal power for imaging.
Drawings
Fig. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention.
Fig. 2 is a distortion graph of an optical imaging system according to a first embodiment of the present invention.
Fig. 3 is a field curvature graph of an optical imaging system according to a first embodiment of the present invention.
Fig. 4 is a graph of a vertical axis color difference of an optical imaging system according to a first embodiment of the present invention.
Fig. 5 is an axial chromatic aberration diagram of the optical imaging system according to the first embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.
Fig. 7 is a distortion graph of an optical imaging system according to a second embodiment of the present invention.
Fig. 8 is a field curvature graph of an optical imaging system according to a second embodiment of the present invention.
Fig. 9 is a graph of vertical axis chromatic aberration of an optical imaging system according to a second embodiment of the present invention.
Fig. 10 is an axial chromatic aberration diagram of an optical imaging system according to a second embodiment of the present invention.
Fig. 11 is a schematic structural view of an optical imaging system according to a third embodiment of the present invention.
Fig. 12 is a distortion graph of an optical imaging system according to a third embodiment of the present invention.
Fig. 13 is a field curvature graph of an optical imaging system according to a third embodiment of the present invention.
Fig. 14 is a graph showing a vertical axis color difference of an optical imaging system according to a third embodiment of the present invention.
Fig. 15 is an axial chromatic aberration diagram of an optical imaging system according to a third embodiment of the invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The embodiment of the invention provides an optical imaging system, which sequentially comprises from an object side to an imaging surface along an optical axis: a diaphragm; a first prism having optical power, the first prism including at least a first entrance face, a first exit face, and a first reflection face; the second prism is provided with optical power and at least comprises a second incidence surface, a second emergent surface and a second reflecting surface. More specifically, a diaphragm is arranged in front of the first incident surface of the first prism and used for converging the light range entering the optical imaging system; light rays which are converged by the diaphragm enter the first prism through the first incidence surface, are reflected by the first reflection surface in the first prism, the reflected light rays can exit the first prism through the first exit surface, then reach the second incidence surface and enter the second prism through the second incidence surface, are reflected by the second reflection surface in the second prism, and finally reach the second prism through the second exit surface and finally reach the imaging surface for imaging.
As an optimized embodiment of the present invention, the first prism is provided as a prism having positive optical power, and the second prism is provided as a prism having negative optical power. According to the embodiment of the invention, the first prism is set to have a certain positive focal power, the second prism is set to have a certain negative focal power, and meanwhile, the first prism is set to be the triple prism comprising the first incidence surface, the first emergence surface and the first reflection surface, and the second prism is set to be the triple prism comprising the second incidence surface, the second emergence surface and the second reflection surface, so that light entering the optical imaging system can be turned twice, the equivalent optical total length of the optical imaging system is reduced, and clear imaging can be realized on the imaging surface.
As a further optimization of the embodiment of the invention, the first incident surface, the first emergent surface, the second incident surface and the second emergent surface are all arranged to be aspheric, so that the aberration of the optical imaging system is corrected, and the imaging quality of the optical imaging system is improved. Meanwhile, the first reflecting surface and the second reflecting surface are arranged to be planes, and the first reflecting surface and the second reflecting surface are arranged in parallel, so that light rays emitted from the first incident surface are parallel to light rays emitted from the second emergent surface, the length size and the height size of the optical imaging system are reduced, and the optical imaging system is simple in structure and convenient to assemble.
As a further optimization of the embodiment of the invention, the first incident surface is arranged as a convex surface at the paraxial region for diffusing the light transmitted through the first incident surface; the first emergent surface is arranged as a concave surface at a paraxial region and is used for converging light rays transmitted through the first emergent surface; the second incident surface is arranged as a convex surface or a concave surface at the paraxial region and is used for converging the light transmitted through the second incident surface; the second emergent surface is arranged as a concave surface at the paraxial region and is used for further converging the light transmitted through the second emergent surface and clearly imaging on the imaging surface.
The optical imaging system provided by the embodiment of the invention can enable the structure of the optical imaging system to be more compact by adopting two prisms with optical power for imaging, and has the advantages of long focal length, short depth, low sensitivity and high pixel.
In some embodiments, the image height IH corresponding to the maximum field angle of the optical imaging system and the effective focal length f of the optical imaging system satisfy: IH/f is more than 0.1 and less than 0.2. The optical imaging system can realize the balance of long focal length, large image surface and high pixel imaging by meeting the above conditions.
In some embodiments, the total optical path length TTL of the optical imaging system from the first entrance face to the imaging face at the paraxial region and the equivalent total optical length THL of the optical imaging system from the first entrance face to the imaging face at the paraxial region satisfy: THL/TTL is more than 0.2 and less than 0.6; the effective focal length f of the optical imaging system and the total optical path length TTL of the optical imaging system from the first incident surface to the imaging surface at the paraxial region satisfy the following conditions: 0.8 < f/TTL < 1.0. The optical imaging system meets the above conditional expression, and the effect that the first prism and the second prism can change the light path propagation can be utilized to make the longer total light path length TTL in the optical imaging system equivalent to the shorter total light path length THL, thereby being beneficial to realizing the characteristics of miniaturization and small volume of the optical imaging system and simultaneously making the optical imaging system have long focus.
In some embodiments, the effective focal length f1 of the first prism and the effective focal length f of the optical imaging system satisfy: 0.7 < f1/f < 1.1. The focal length of the first prism is reasonably set, so that the light trend can be effectively controlled, the incident angle of light entering an imaging surface is increased, and the problem of high prism sensitivity caused by overlarge light deflection degree can be avoided while a large imaging surface is realized.
In some embodiments, the effective focal length f2 of the second prism and the effective focal length f of the optical imaging system satisfy: -1.5 < f2/f < -0.5. The focal length of the second prism is reasonably controlled to meet the above conditional expression, so that the field curvature of the optical imaging system can be well improved while the long focus of the optical imaging system is met, and the imaging quality of the optical imaging system is improved.
In some embodiments, the air distance AT12 between the first exit surface and the second entrance surface AT the paraxial region and the total optical path length TTL of the optical imaging system from the first entrance surface to the imaging surface AT the paraxial region satisfy: 0.1 < AT12/TTL < 0.5. The air space between the first prism and the second prism is reasonably set, so that the high-grade spherical aberration of the optical imaging system can be well controlled, the equivalent optical total length of the optical imaging system can be reduced, and the characteristics of small depth and long focal length can be realized.
In some embodiments, the effective focal length f of the optical imaging system and the effective focal length f1 of the first prism and the effective focal length f2 of the second prism satisfy: 1.7 < (1/f 1-1/f 2)/(1/f) < 2.6. The above conditional expression is satisfied, the aspheric shapes of the first prism and the second prism can be effectively balanced, the process molding difficulty is reduced, and the resolution of the optical imaging system is improved.
In some embodiments, the effective focal length f1 of the first prism and the effective focal length f2 of the second prism satisfy: -1.7 < f1/f2 < -0.5. The focal length ratio of the first prism and the second prism is reasonably set, so that the light deflection degree entering the optical imaging system can be prevented from being too large, the sensitivity of the optical imaging system is reduced, the vertical axis chromatic aberration of the optical imaging system is improved, and the resolving power of the optical imaging system is improved.
In some embodiments, the radius of curvature R1 of the first incident surface and the effective focal length f of the optical imaging system satisfy: r1/f is more than 0.4 and less than 0.6. The above conditional expression is satisfied, and by reasonably controlling the aspherical shape of the first incident surface, the aberration of the optical imaging system can be well corrected, and the imaging quality of the optical imaging system is improved.
In some embodiments, the radius of curvature R6 of the second exit surface and the effective focal length f of the optical imaging system satisfy: r6/f is more than 0.2 and less than 1.1. The above conditional expression is satisfied, and by reasonably controlling the aspherical shape of the second emergent surface, the aberration of the optical imaging system can be well corrected, and the imaging quality of the optical imaging system is improved.
In some embodiments, the radius of curvature R4 of the second entrance face and the radius of curvature R6 of the second exit face satisfy: 0.5 < (R4+R6)/(R4-R6) < 1.2. The surface shapes of the second incident surface and the second emergent surface can be reasonably controlled, the processing difficulty of the second prism is reduced, and the production yield is improved.
In some embodiments, the radius of curvature R1 of the first entrance face and the radius of curvature R3 of the first exit face satisfy: -1.2 < (R1+R3)/(R1-R3) < -0.8. The surface shapes of the first incident surface and the first emergent surface are reasonably controlled to well modify the field curvature and distortion of the optical imaging system, so that the field curvature and distortion of the optical imaging system are controlled at a smaller level.
The invention is further illustrated in the following examples. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
In various embodiments of the present invention, when the first incident surface, the first exit surface, the second incident surface, and the second exit surface are aspheric, the surface shape of the aspheric surface satisfies the following equation:
the method comprises the steps of carrying out a first treatment on the surface of the Where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h along the optical axis direction, c is the paraxial curvature of the surface, and k isConic coefficient (Cone, A) 2i The aspherical surface profile coefficient of the 2 i-th order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical imaging system 100 according to a first embodiment of the present invention is shown, where the optical imaging system 100 includes, in order from an object side to an imaging surface S7 along an optical axis: a diaphragm ST, a first prism M1 and a second prism M2.
Specifically, the first prism M1 is a triangular prism with positive focal power, the first prism M1 includes a first incident surface S1, a first reflecting surface S2, and a first exit surface S3, where the first incident surface S1 is convex at a paraxial region, the first reflecting surface S2 is a plane, and the first exit surface S3 is concave at a paraxial region; the second prism M2 is a triangular prism having negative optical power, the second prism M2 includes a second incident surface S4, a second reflecting surface S5, and a second exit surface S6, and the second incident surface S4 is concave at the paraxial region, the second reflecting surface S5 is a plane, and the second exit surface S6 is concave at the paraxial region. The first incident surface S1, the first emitting surface S3, the second incident surface S4, and the second emitting surface S6 are all aspheric, and the first reflecting surface S2 and the second reflecting surface S5 are disposed in parallel.
More specifically, the design parameters of each prism of the optical imaging system 100 provided in this embodiment are shown in table 1.
TABLE 1
The aspherical surface profile coefficients of the optical imaging system 100 in this embodiment are shown in table 2.
TABLE 2
In the present embodiment, a distortion curve, a field curvature curve, a vertical axis chromatic aberration curve, and an axial chromatic aberration curve of the optical imaging system 100 are shown in fig. 2, 3, 4, and 5, respectively.
In fig. 2, the curves represent distortions corresponding to different image heights on the imaging plane, the abscissa represents the distortion magnitude (unit:%) and the ordinate represents the angle of view (unit: °). As can be seen from fig. 2, the distortion is controlled within ±2.0% in the imaging field required by the optical imaging system, which means that the distortion of the optical imaging system is well corrected.
In fig. 3, the curves represent field curves of different image heights in the meridian direction and the sagittal direction on the imaging plane, the abscissa represents the offset (unit: mm), and the ordinate represents the angle of view (unit: °). As can be seen from fig. 3, the field curvature offset in both the meridian direction and the sagittal direction on the imaging plane is controlled within ±0.03mm, which indicates that the field curvature correction of the optical imaging system is good.
FIG. 4 is a graph showing the vertical chromatic aberration of each wavelength with respect to the main wavelength at different image heights on an imaging plane, the horizontal axis showing the vertical chromatic aberration value (unit: μm), and the vertical axis showing the normalized angle of view. As can be seen from fig. 4, in different fields of view, the vertical chromatic aberration of each wavelength with respect to the center wavelength is controlled within ±7.0 μm, which means that the vertical chromatic aberration of the optical imaging system is well corrected.
The graph of fig. 5 shows the axial chromatic aberration at the imaging plane at the paraxial region for each wavelength, the abscissa shows the axial chromatic aberration value (unit: mm), and the ordinate shows the normalized pupil radius. As can be seen from fig. 5, the offset of the axial chromatic aberration is controlled within ±0.3mm, which indicates that the axial chromatic aberration of the optical imaging system can be well corrected.
Second embodiment
Referring to fig. 6, a schematic diagram of an optical imaging system 200 according to a second embodiment of the present invention is shown, and the optical imaging system 200 according to the present embodiment is substantially the same as the first embodiment.
Specifically, the design parameters of the optical imaging system 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
The aspherical surface profile coefficients of the optical imaging system 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
In the present embodiment, a distortion curve, a field curvature curve, a vertical axis chromatic aberration curve, and an axial chromatic aberration curve of the optical imaging system 200 are shown in fig. 7, 8, 9, and 10, respectively. As can be seen from fig. 7, the distortion is controlled within ±2.0% in the imaging field required by the optical imaging system, which indicates that the distortion of the optical imaging system is well corrected; as can be seen from fig. 8, the field curvature offset in the meridian direction and the sagittal direction on the imaging plane is controlled within ±0.2mm, which indicates that the field curvature correction of the optical imaging system is good; as can be seen from fig. 9, in different fields of view, the vertical chromatic aberration of each wavelength with respect to the center wavelength is controlled within ±2.5 μm, which means that the vertical chromatic aberration of the optical imaging system is well corrected; as can be seen from fig. 10, the shift amount of the axial chromatic aberration is controlled within ±0.5mm, indicating that the axial chromatic aberration of the optical imaging system can be well corrected.
Third embodiment
Referring to fig. 11, a schematic diagram of an optical imaging system 300 according to a third embodiment of the present invention is shown, and the optical imaging system 300 in this embodiment is substantially the same as the first embodiment.
Specifically, the design parameters of the optical imaging system 300 provided in this embodiment are shown in table 5.
TABLE 5
The aspherical surface profile coefficients of the optical imaging system 300 in this embodiment are shown in table 6.
TABLE 6
In the present embodiment, a distortion curve, a field curvature curve, a vertical axis chromatic aberration curve, and an axial chromatic aberration curve of the optical imaging system 300 are shown in fig. 12, 13, 14, and 15, respectively. As can be seen from fig. 12, the distortion is controlled within ±2.0% in the imaging field required by the optical imaging system, which indicates that the distortion of the optical imaging system is well corrected; as can be seen from fig. 13, the field curvature offset in the meridian direction and the sagittal direction on the imaging plane is controlled within ±0.1mm, which indicates that the field curvature correction of the optical imaging system is good; as can be seen from fig. 14, in different fields of view, the vertical chromatic aberration of each wavelength with respect to the center wavelength is controlled within ±0.5 μm, which means that the vertical chromatic aberration of the optical imaging system is well corrected; as can be seen from fig. 15, the shift amount of the axial chromatic aberration is controlled within ±0.25mm, indicating that the axial chromatic aberration of the optical imaging system can be well corrected.
Referring to table 7, the optical characteristics of the optical imaging systems provided in the above three embodiments, respectively, include the maximum field angle FOV, the total length of the optical path TTL, the image height IH, the effective focal length f, the aperture value FNO, the effective focal length of each prism, and the related values corresponding to each of the foregoing conditional expressions.
TABLE 7
From the distortion curve graph, the field curvature graph, the vertical axis chromatic aberration graph and the axial chromatic aberration graph of the above embodiments, it can be seen that the distortion value of the optical imaging system is within ±2%, the field curvature value is within ±0.2mm, the vertical axis chromatic aberration value is within ±7.0 μm, and the axial chromatic aberration value is within ±0.5mm in each embodiment, which indicates that the optical imaging system provided by the present invention has good resolution.
In summary, the optical imaging system provided by the invention adopts two prisms with specific optical power, and the optical imaging system has the advantages of long focal length, short depth, low sensitivity and high pixel through specific surface shape collocation and reasonable optical power distribution, so that the requirements of product advance of manufacturers are better met.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (11)
1. An optical imaging system, comprising, in order from an object side to an imaging plane along an optical axis:
a first prism having optical power, the first prism including at least a first entrance face, a first exit face, and a first reflective face;
a second prism having optical power, the second prism including at least a second entrance face, a second exit face, and a second reflection face;
the light transmitted through the first incidence surface enters the first prism, is reflected by the first reflection surface, the reflected light is transmitted through the first emergent surface to exit the first prism, the light enters the second prism after reaching the second incidence surface, is reflected by the second reflection surface, and the reflected light is transmitted through the second emergent surface to exit the second prism;
wherein, the effective focal length f1 of the first prism and the effective focal length f2 of the second prism satisfy: -1.7 < f1/f2 < -0.5.
2. The optical imaging system of claim 1, wherein the first prism has positive optical power and the second prism has negative optical power.
3. The optical imaging system of claim 2, wherein the first entrance face, the first exit face, the second entrance face, and the second exit face are aspheric, and the first reflective face and the second reflective face are planar.
4. The optical imaging system of claim 3, wherein the first entrance face is convex at a paraxial region, the first exit face is concave at a paraxial region, the second entrance face is convex or concave at a paraxial region, and the second exit face is concave at a paraxial region.
5. The optical imaging system of claim 3, wherein the first reflective surface is disposed in parallel with the second reflective surface.
6. The optical imaging system of claim 4, wherein the optical imaging system satisfies the following conditional expression:
0.1＜IH/f＜0.2；
wherein IH represents the image height corresponding to the maximum field angle of the optical imaging system, and f represents the effective focal length of the optical imaging system.
7. The optical imaging system of claim 4, wherein the optical imaging system satisfies the following conditional expression:
0.2＜THL/TTL＜0.6；
wherein TTL represents an optical path total length of the optical imaging system from the first incident surface to the imaging surface at a paraxial region, THL represents an equivalent optical total length of the optical imaging system from the first incident surface to the imaging surface at a paraxial region.
8. The optical imaging system of claim 4, wherein the optical imaging system satisfies the following conditional expression:
0.7＜f1/f＜1.1；
wherein f1 represents an effective focal length of the first prism, and f represents an effective focal length of the optical imaging system.
9. The optical imaging system of claim 4, wherein the optical imaging system satisfies the following conditional expression:
-1.5＜f2/f＜-0.5；
wherein f2 represents an effective focal length of the second prism, and f represents an effective focal length of the optical imaging system.
10. The optical imaging system of claim 4, wherein the optical imaging system satisfies the following conditional expression:
0.1＜AT12/TTL＜0.5；
where AT12 represents an air space between the first exit surface and the second entrance surface AT a paraxial region, and TTL represents an optical path total length of the optical imaging system from the first entrance surface to the imaging surface AT the paraxial region.
11. The optical imaging system of claim 4, wherein the optical imaging system satisfies the following conditional expression:
1.7＜(1/f1-1/f2)/(1/f)＜2.6；
wherein f represents an effective focal length of the optical imaging system, f1 represents an effective focal length of the first prism, and f2 represents an effective focal length of the second prism.
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