CN213780539U - Eyepiece optical system - Google Patents
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- CN213780539U CN213780539U CN202023328652.8U CN202023328652U CN213780539U CN 213780539 U CN213780539 U CN 213780539U CN 202023328652 U CN202023328652 U CN 202023328652U CN 213780539 U CN213780539 U CN 213780539U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses an eyepiece optical system, which comprises a first lens to a fifth lens along an optical axis in sequence from an eye side to a display side, wherein the first lens is a convex-concave lens with positive refractive index, the second lens and the fourth lens are convex-convex lenses with positive refractive index, the third lens is a convex-concave lens with positive refractive index, the fifth lens is a concave-concave lens with negative refractive index, and the eye side surface and the display side surface of the first lens to the third lens are aspheric surfaces; the fourth lens and the fifth lens are mutually glued, and both the fourth lens and the fifth lens are glass lenses. The utility model has the advantages of field angle is big, and exit pupil distance is big, and exit pupil diameter is big, and the resolution ratio is high, and the distortion is little, and imaging quality is good, and the lens number is few, and is miniaturized, and the volume production yield is good.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an eyepiece optical system of handheld camera.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, unmanned aerial vehicle aerial photography, machine vision, security monitoring, cameras and the like, so that the requirements on the optical imaging lenses are higher and higher.
However, the eyepiece lens used for the handheld camera in the current market has many defects, such as small field angle and incapability of being suitable for large field of view; the exit pupil distance is small, usually less than 20mm, and is not suitable for people with glasses; the exit pupil has a small diameter, usually less than 8mm, and is sensitive to the position of the human eye; the number of lenses is large, the volume is large, the product performance is poor, and the like, so that the requirements of consumers which are increasing increasingly cannot be met, and the improvement is urgently needed.
Disclosure of Invention
An object of the utility model is to provide an eyepiece optical system is used for solving the technical problem that above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: an eyepiece optical system is used for enabling imaging light to enter eyes of an observer from a display picture through the eyepiece optical system for imaging, the direction facing the eyes is an eye side, the direction facing the display picture is a display side, and the eyepiece optical system sequentially comprises a first lens to a fifth lens along an optical axis from the eye side to the display side; the first lens to the fifth lens respectively comprise an eye side surface facing to the eye side and allowing the imaging light to pass through and a display side surface facing to the display side and allowing the imaging light to pass through;
the first lens element has positive refractive index, the eye side surface of the first lens element is convex, and the display side surface of the first lens element is concave;
the second lens element has positive refractive index, the eye side surface of the second lens element is convex, and the display side surface of the second lens element is convex;
the third lens element with positive refractive index has a concave eye side surface and a convex display side surface;
the fourth lens element with positive refractive index has a convex eye side surface and a convex display side surface;
the fifth lens element with negative refractive index has a concave eye side surface and a concave display side surface;
the eye side surfaces and the display side surfaces of the first lens, the second lens and the third lens are aspheric surfaces; the fourth lens and the fifth lens are mutually glued, and both the fourth lens and the fifth lens are glass lenses;
the eyepiece optical system has only the first lens to the fifth lens with the refractive index.
Further, the first lens, the second lens and the third lens are all made of plastic materials.
Further, the eyepiece optical system further satisfies: nd5-nd4 is less than or equal to 0.12, wherein nd4 is the refractive index of the fourth lens, and nd5 is the refractive index of the fifth lens.
Furthermore, the eyepiece optical system further satisfies: nd5 is more than or equal to 1.92 and is more than or equal to 1.80 and more than or equal to nd 4.
Further, the eyepiece optical system further satisfies: vd4-vd5 is more than or equal to 13, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
Further, the eyepiece optical system further satisfies: and nd1 is not less than 1.64, wherein nd1 is the refractive index of the first lens.
Further, the eyepiece optical system further satisfies: 1.54 is less than or equal to nd2, wherein nd2 is the refractive index of the second lens.
Further, the eyepiece optical system further satisfies: and nd3 is not less than 1.64, wherein nd3 is the refractive index of the third lens.
Further, the eyepiece optical system further satisfies: TTL is less than or equal to 44.10mm, wherein TTL is the distance between the eye side surface of the first lens and the optical axis of the display picture.
The utility model has the advantages of:
the utility model adopts five lenses, and each lens is correspondingly designed, so that the field angle is large, and the horizontal field angle can reach 40 degrees; the exit pupil distance is large and can reach 25 mm; the diameter of an exit pupil is large and can reach 20mm, and the clear and stable image quality can be ensured when the human eye moves in a large range; the image quality is good, the distortion is small, and the imaging quality is excellent; the number of lenses is small, the miniaturization is realized, and the product performance is realized; the sensitivity of the lens is good, and the yield of mass production is good.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF at 0.4861-0.6563 μm according to the first embodiment of the present invention;
fig. 3 is a graph showing curvature of field and distortion according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 5 is a graph of MTF at 0.4861-0.6563 μm according to example II of the present invention;
fig. 6 is a graph showing curvature of field and distortion according to the second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 8 is a graph of MTF at 0.4861-0.6563 μm according to a third embodiment of the present invention;
fig. 9 is a graph showing curvature of field and distortion according to a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 11 is a graph of MTF at 0.4861-0.6563 μm according to example four of the present invention;
fig. 12 is a graph showing curvature of field and distortion according to a fourth embodiment of the present invention.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens sheets) of optical design software. Regarding the eye side, when the R value is positive, the eye side is judged to be a convex side; when the R value is negative, the eye side surface is judged to be a concave surface. On the contrary, regarding the display side surface, when the R value is positive, the display side surface is judged to be a concave surface; when the R value is negative, the display side is judged to be convex.
The utility model discloses an eyepiece optical system, which is used for enabling imaging light to enter eyes of an observer from a display picture through the eyepiece optical system for imaging, wherein the direction towards the eyes is an eye side, the direction towards the display picture is a display side, and the eyepiece optical system sequentially comprises a first lens to a fifth lens from the eye side to the display side along an optical axis; the first lens to the fifth lens respectively comprise an eye side surface facing to the eye side and allowing the imaging light to pass through and a display side surface facing to the display side and allowing the imaging light to pass through.
The first lens element has a positive refractive index, the eye side surface of the first lens element is a convex surface, the display side surface of the first lens element is a concave surface, both the eye side surface and the display side surface of the first lens element are aspheric surfaces, the first lens element is used for reducing the primary aberration (especially spherical aberration) amount and also reducing the high-grade aberration amount, correcting partial aberration, and lightening the burden of a rear group.
The second lens has positive refractive index, the eye side surface of the second lens is a convex surface, the display side surface of the second lens is a convex surface, the eye side surface and the display side surface of the second lens are both aspheric surfaces, the second lens is used for reducing the primary amount of aberration (especially spherical aberration) and also can reduce the high-grade amount of the aberration, the second lens and the first lens jointly correct the off-axis aberration of the system, the effect of using a plurality of spherical lenses is achieved by using one aspheric lens, the structure is simpler, and the total length of the system is easier to shorten.
The third lens element has a positive refractive index, the eye side surface of the third lens element is a concave surface, the display side surface of the third lens element is a convex surface, both the eye side surface and the display side surface of the third lens element are aspheric surfaces, the third lens element is used for reducing the primary aberration (especially spherical aberration) and reducing the high-grade aberration, the third lens element and the first lens element jointly correct the off-axis aberration of the system, the effect of using a plurality of spherical lens elements is achieved by using one aspheric lens element, the structure is simpler, and the total length of the system is easier to shorten.
The fourth lens element with positive refractive power has a convex object-side surface, a convex display-side surface and a glass lens element, and can further correct aberration and effectively reduce primary aberration.
The fifth lens element has negative refractive index, the eye side surface of the fifth lens element is concave, the display side surface of the fifth lens element is concave, and the fifth lens element is glass; and the fourth lens and the fifth lens are mutually glued to correct the chromatic aberration of the system.
The eyepiece optical system has only the first lens to the fifth lens with the refractive index. The utility model adopts five lenses, and each lens is correspondingly designed, so that the field angle is large, and the horizontal field angle can reach 40 degrees; the exit pupil distance is large and can reach 25 mm; the diameter of an exit pupil is large and can reach 20mm, and the clear and stable image quality can be ensured when the human eye moves in a large range; the image quality is good, the distortion is small, and the imaging quality is excellent; the number of lenses is small, the miniaturization is realized, and the product performance is realized; the sensitivity of the lens is good, and the yield of mass production is good.
Preferably, the first lens, the second lens and the third lens are all made of plastic materials, so that the weight is further reduced, the cost is reduced, and the product performance is improved.
Preferably, the eyepiece optical system further satisfies: nd5-nd4 is less than or equal to 0.12, nd4 is the refractive index of the fourth lens, nd5 is the refractive index of the fifth lens, and the chromatic aberration of the system is further optimized.
More preferably, the eyepiece optical system further satisfies: nd4 is more than or equal to 1.80 and less than or equal to nd5 and less than or equal to 1.92, so that MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: and vd4-vd5 is more than or equal to 13, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens, so that the chromatic aberration of the system is further optimized.
Preferably, the eyepiece optical system further satisfies: nd1 is not less than 1.64, wherein nd1 is the refractive index of the first lens, so that MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: nd2 is not less than 1.54, wherein nd2 is the refractive index of the second lens, so that MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: nd3 is not less than 1.64, wherein nd3 is the refractive index of the third lens, so that MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: TTL is less than or equal to 44.10mm, wherein TTL is the distance between the eye side surface of the first lens and the optical axis of the display picture, the total length of the system is further shortened, and miniaturization is realized.
The following will come to the specific embodiment and the utility model discloses an eyepiece optical system carries out the detailed description, and following embodiment all adopts reverse design (the contrary trace of light direction) method to come the utility model discloses an eyepiece optical system's performance carries out the detailed description, is about to people's eye exit pupil as the diaphragm, and display screen is as the imaging surface, and light jets out through this eyepiece optical system from people's eye exit pupil and focuses on the formation of image to display screen.
Example one
As shown in fig. 1, an eyepiece optical system for imaging an imaging light beam entering an eye of an observer from a display screen 7 through the eyepiece optical system and an eye exit pupil 6 of the observer, the direction toward the eye being an eye side a1, the direction toward the display screen 7 being a display side a2, the eyepiece optical system comprising, in order along an optical axis I, the eye exit pupil 6 (as a diaphragm), a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and the display screen 7 (as an imaging surface), from the eye side a1 to the display side a 2; the first lens element 1 to the fifth lens element 5 each include an eye side surface facing the eye side a1 and passing the image light and a display side surface facing the display side a2 and passing the image light.
The first lens element 1 has a positive refractive index, the eye side surface 11 of the first lens element 1 is a convex surface, and the display side surface 12 of the first lens element 1 is a concave surface.
The second lens element 2 has a positive refractive index, the object side 21 of the second lens element 2 is a convex surface, and the display side 22 of the second lens element 2 is a convex surface.
The third lens element 3 has a positive refractive index, the object side surface 31 of the third lens element 3 is concave, and the display side surface 32 of the third lens element 3 is convex.
The fourth lens element 4 has a positive refractive index, the eye-side surface 41 of the fourth lens element 4 is a convex surface, and the display-side surface 42 of the fourth lens element 4 is a convex surface.
The fifth lens element 5 has a negative refractive index, the eye-side surface 51 of the fifth lens element 5 is concave, and the display-side surface 52 of the fifth lens element 5 is concave.
The eye side surfaces 11, 21, 31 and the display side surfaces 12, 22, 32 of the first lens 1, the second lens 2 and the third lens 3 are all aspheric.
The fourth lens 4 and the fifth lens 5 are mutually glued, and the fourth lens 4 and the fifth lens 5 are both glass spherical lenses.
In this embodiment, the first lens 1, the second lens 2, and the third lens 3 are preferably made of plastic materials, but not limited thereto, and in some embodiments, other optical materials such as glass may be used.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
In this embodiment, the eye side surfaces 11, 21, 31 and the display side surfaces 12, 22, 32 are defined according to the following aspheric curve formula:
wherein:
r is the distance from a point on the optical surface to the optical axis.
z is the rise of this point in the direction of the optical axis.
c is the curvature of the surface.
K is the conic constant of the surface.
A4、A6、A8、A10、A12Respectively as follows: aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order.
For details of parameters of each aspheric surface, please refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 |
| 11 | -9.809 | -7.45E-06 | -3.43E-07 | -2.78E-09 | 1.27E-11 | -6.16E-14 |
| 12 | -8.560 | -4.37E-05 | -1.77E-07 | 4.79E-11 | -1.45E-12 | 2.05E-14 |
| 21 | 58.972 | -4.42E-05 | 2.63E-07 | 1.30E-10 | -1.16E-12 | -1.20E-14 |
| 22 | -0.383 | 9.04E-06 | 7.00E-08 | 1.69E-10 | 1.14E-12 | -1.28E-14 |
| 31 | -0.105 | 2.18E-05 | 2.62E-07 | 6.75E-10 | -1.33E-13 | -1.07E-14 |
| 32 | -1.549 | 8.92E-06 | 2.88E-07 | 5.46E-10 | -3.91E-12 | 4.57E-14 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 2, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the image quality is good; referring to (a) and (B) of fig. 3, it can be seen that the field curvature and distortion are small, the distortion is less than-1%, and the imaging quality is good.
In this embodiment, the focal length f of the eyepiece optical system is 21.87 mm; horizontal field angle FOV equals 40.0 °; the exit pupil distance is 25.0mm, and the exit pupil diameter is 20.0 mm; the distance TTL between the eye-side surface 11 of the first lens 1 and the display screen 7 on the optical axis I is 42.81 mm.
Example two
As shown in fig. 4, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 |
| 11 | -7.511 | -2.85E-06 | -2.95E-07 | -2.56E-09 | 1.24E-11 | -6.27E-14 |
| 12 | -8.885 | -4.29E-05 | -1.70E-07 | 1.50E-10 | -9.00E-13 | 1.37E-14 |
| 21 | 58.668 | -4.61E-05 | 2.56E-07 | 1.07E-10 | -1.30E-12 | -1.01E-14 |
| 22 | -0.382 | 9.70E-06 | 6.61E-08 | 1.57E-10 | 1.10E-12 | -1.24E-14 |
| 31 | 0.125 | 1.81E-05 | 2.44E-07 | 5.59E-10 | -4.76E-13 | -7.50E-15 |
| 32 | -1.426 | 6.59E-06 | 2.45E-07 | 2.96E-10 | -4.24E-12 | 4.43E-14 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 5, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the image quality is good; referring to (a) and (B) of fig. 6, it can be seen that the field curvature and distortion are small, the distortion is less than-1.8%, and the imaging quality is good.
In this embodiment, the focal length f of the eyepiece optical system is 22.00 mm; horizontal field angle FOV equals 40.0 °; the exit pupil distance is 25.0mm, and the exit pupil diameter is 20.0 mm; the distance TTL between the eye-side surface 11 of the first lens 1 and the display screen 7 on the optical axis I is 44.07 mm.
EXAMPLE III
As shown in fig. 7, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 |
| 11 | -9.015 | -4.95E-06 | -3.17E-07 | -2.74E-09 | 1.23E-11 | -5.99E-14 |
| 12 | -8.604 | -4.38E-05 | -1.78E-07 | 4.79E-11 | -1.54E-12 | 1.82E-14 |
| 21 | 57.863 | -4.49E-05 | 2.61E-07 | 1.30E-10 | -1.13E-12 | -1.16E-14 |
| 22 | -0.390 | 9.48E-06 | 7.14E-08 | 1.74E-10 | 1.14E-12 | -1.29E-14 |
| 31 | -0.036 | 2.08E-05 | 2.56E-07 | 6.46E-10 | -1.96E-13 | -9.49E-15 |
| 32 | -1.460 | 8.13E-06 | 2.83E-07 | 5.34E-10 | -3.92E-12 | 4.54E-14 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 8, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the image quality is good; referring to (a) and (B) of fig. 9, it can be seen that the field curvature and distortion are small, the distortion is less than-1.1%, and the imaging quality is good.
In this embodiment, the focal length f of the eyepiece optical system is 21.89 mm; horizontal field angle FOV equals 40.0 °; the exit pupil distance is 25.0mm, and the exit pupil diameter is 20.0 mm; the distance TTL between the eye-side surface 11 of the first lens 1 and the display screen 7 on the optical axis I is 42.85 mm.
Example four
As shown in fig. 10, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 |
| 11 | -9.504 | -7.77E-06 | -3.44E-07 | -2.80E-09 | 1.26E-11 | -6.16E-14 |
| 12 | -8.573 | -4.38E-05 | -1.77E-07 | 4.93E-11 | -1.46E-12 | 1.99E-14 |
| 21 | 58.786 | -4.42E-05 | 2.63E-07 | 1.28E-10 | -1.17E-12 | -1.20E-14 |
| 22 | -0.382 | 8.89E-06 | 6.96E-08 | 1.68E-10 | 1.13E-12 | -1.28E-14 |
| 31 | -0.104 | 2.19E-05 | 2.62E-07 | 6.75E-10 | -1.41E-13 | -1.06E-14 |
| 32 | -1.508 | 8.68E-06 | 2.91E-07 | 5.67E-10 | -3.92E-12 | 4.51E-14 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 11, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the image quality is good; referring to (a) and (B) of fig. 12, it can be seen that the field curvature and distortion are small, the distortion is less than-1.4%, and the imaging quality is good.
In this embodiment, the focal length f of the eyepiece optical system is 21.92 mm; horizontal field angle FOV equals 40.0 °; the exit pupil distance is 25.0mm, and the exit pupil diameter is 20.0 mm; the distance TTL between the eye-side surface 11 of the first lens 1 and the display screen 7 on the optical axis I is 42.79 mm.
Table 5 values of relevant important parameters of four embodiments of the present invention
| First embodiment | Second embodiment | Third embodiment | Fourth embodiment | |
| nd5-nd4 | 0.09 | 0.09 | 0.09 | 0.12 |
| vd4-vd5 | 23.80 | 21.80 | 23.80 | 24.80 |
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An eyepiece optical system for imaging an imaging light from a display screen through the eyepiece optical system into an eye of an observer, the direction toward the eye being a target side and the direction toward the display screen being a display side, the eyepiece optical system comprising: the eyepiece optical system comprises a first lens to a fifth lens along an optical axis in sequence from an object side to a display side; the first lens to the fifth lens respectively comprise an eye side surface facing to the eye side and allowing the imaging light to pass through and a display side surface facing to the display side and allowing the imaging light to pass through;
the first lens element has positive refractive index, the eye side surface of the first lens element is convex, and the display side surface of the first lens element is concave;
the second lens element has positive refractive index, the eye side surface of the second lens element is convex, and the display side surface of the second lens element is convex;
the third lens element with positive refractive index has a concave eye side surface and a convex display side surface;
the fourth lens element with positive refractive index has a convex eye side surface and a convex display side surface;
the fifth lens element with negative refractive index has a concave eye side surface and a concave display side surface;
the eye side surfaces and the display side surfaces of the first lens, the second lens and the third lens are aspheric surfaces; the fourth lens and the fifth lens are mutually glued, and both the fourth lens and the fifth lens are glass lenses;
the eyepiece optical system has only the first lens to the fifth lens with the refractive index.
2. The eyepiece optical system of claim 1, wherein: the first lens, the second lens and the third lens are all made of plastic materials.
3. The eyepiece optical system of claim 1, further comprising: nd5-nd4 is less than or equal to 0.12, wherein nd4 is the refractive index of the fourth lens, and nd5 is the refractive index of the fifth lens.
4. The eyepiece optical system of claim 3, further comprising: nd5 is more than or equal to 1.92 and is more than or equal to 1.80 and more than or equal to nd 4.
5. The eyepiece optical system of claim 1, further comprising: vd4-vd5 is more than or equal to 13, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
6. The eyepiece optical system of claim 1, further comprising: and nd1 is not less than 1.64, wherein nd1 is the refractive index of the first lens.
7. The eyepiece optical system of claim 1, further comprising: 1.54 is less than or equal to nd2, wherein nd2 is the refractive index of the second lens.
8. The eyepiece optical system of claim 1, further comprising: and nd3 is not less than 1.64, wherein nd3 is the refractive index of the third lens.
9. The eyepiece optical system of claim 1, further comprising: TTL is less than or equal to 44.10mm, wherein TTL is the distance between the eye side surface of the first lens and the optical axis of the display picture.
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| CN112630954A (en) * | 2020-12-30 | 2021-04-09 | 厦门力鼎光电股份有限公司 | Eyepiece optical system |
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| CN112630954A (en) * | 2020-12-30 | 2021-04-09 | 厦门力鼎光电股份有限公司 | Eyepiece optical system |
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