CN219676368U - Optical system with long exit pupil distance eyepiece - Google Patents
Optical system with long exit pupil distance eyepiece Download PDFInfo
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- CN219676368U CN219676368U CN202320138787.2U CN202320138787U CN219676368U CN 219676368 U CN219676368 U CN 219676368U CN 202320138787 U CN202320138787 U CN 202320138787U CN 219676368 U CN219676368 U CN 219676368U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 84
- 210000001747 pupil Anatomy 0.000 title claims abstract description 42
- 239000000463 material Substances 0.000 claims description 18
- 230000005499 meniscus Effects 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000005304 optical glass Substances 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 10
- 238000003384 imaging method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004424 eye movement Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The utility model discloses an optical system with a long exit pupil distance ocular, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along an optical axis from an object side to an image side; the first lens and the second lens are glued to form a glued lens, the focal power of the first lens is negative, the focal power of the second lens is positive, the focal power of the third lens is positive, and the focal power of the fourth lens is positive. According to the embodiment of the utility model, the aberration of the optical system is corrected through the cemented lens, most of optical power is provided for the optical system through the third lens, the aberration of the optical system is corrected through the fourth lens, and the optical system is supplemented with light focus, so that the lens has a larger exit pupil diameter and a longer exit pupil distance, is suitable for the application of handheld observation equipment, and can be widely applied to the technical field of optics.
Description
Technical Field
The utility model relates to the technical field of optics, in particular to an optical system with a long exit pupil distance eyepiece.
Background
As technology advances, pixels on a display are made smaller and smaller, and thus displays of the same resolution can be made smaller and smaller. Meanwhile, the OLED (Organic Light Emitting Diode) display does not need backlight, and the self-luminescence property of each pixel point also enables the display to have lower power consumption and better display effect. Portable thermal imaging devices, sighting telescope and other handheld viewing devices often can only be made small in size for portability, and therefore, an eyepiece is required to image a small-sized display. Compared with a fixed relatively larger observation device, the handheld observation device is more severe in use environment, can face the influence factors such as jolt shake, high and low temperature and the like, and a user can wear glasses, goggles and other equipment, and an eye shield is arranged at the rear part of the eyepiece sometimes, so that the device has higher requirements on the exit pupil distance of the eyepiece.
In the prior art, an eyepiece optical system of a handheld observation device often has the defect of short exit pupil distance.
Disclosure of Invention
In view of the above, an object of the embodiments of the present utility model is to provide an optical system with a long exit pupil distance eyepiece, which has a larger exit pupil diameter and a longer exit pupil distance through a reasonable optical structural design.
The embodiment of the utility model provides an optical system with a long exit pupil distance ocular, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along an optical axis from an object side to an image side; the first lens and the second lens are glued into a glued lens; the focal power of the first lens is negative, and the focal power of the second lens is positive; the focal power of the third lens is positive; the focal power of the fourth lens is positive.
Optionally, the first lens comprises a biconvex lens, the second lens comprises a meniscus lens, the third lens comprises a meniscus lens, and the fourth lens comprises an aspherical lens.
Optionally, the first surface, the bonding surface and the second surface of the bonding lens are spherical, the curvature radius of the first surface is 85-95 mmmm, the curvature radius of the bonding surface is-25-15 mm, and the curvature radius of the second surface is-55-45 mmmm.
Optionally, the third surface and the fourth surface of the third lens are spherical, the radius of curvature of the third surface is 15-25 mm, and the radius of curvature of the fourth surface is 60-70 mm.
Optionally, the materials of the first lens, the second lens and the third lens each comprise an optical glass material, and the material of the fourth lens comprises an optical resin material.
Optionally, the fifth surface and the sixth surface of the fourth lens are both even aspheric, the radius of curvature of the fifth surface is-25 to-15 mm, and the radius of curvature of the sixth surface is-15 to-5 mm.
Optionally, the focal length f of the optical system has the following relationship with the focal length f1 of the first lens: 9.5< |f/f1| <10.5.
Optionally, the focal length f of the optical system and the focal length f2 of the second lens have the following relationship: 8.5< |f/f2| <9.5.
Optionally, the focal length f of the optical system and the focal length f3 of the third lens have the following relationship: 1< |f/f3| <2.
Optionally, a focal length f of the optical system and a focal length f4 of the fourth lens have the following relationship: 1.2< |f/f4| <2.2.
The embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides an optical system with a long exit pupil distance eyepiece, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along an optical axis from an object side to an image side, wherein the first lens and the second lens are glued to form a glued lens, the focal power of the first lens is negative, the focal power of the second lens is positive, the focal power of the third lens is positive, and the focal power of the fourth lens is positive; the aberration of the optical system is corrected through the cemented lens, most of optical power is provided for the optical system through the third lens, the aberration of the optical system is corrected through the fourth lens, and the optical system is supplemented with light focus, so that the cemented lens has large exit pupil diameter and long exit pupil distance, and is suitable for application of handheld observation equipment.
Drawings
FIG. 1 is a schematic diagram of an optical system with a long exit pupil distance eyepiece according to an embodiment of the utility model;
FIG. 2 is a graph of MTF for an optical system having a long exit pupil distance eyepiece provided by an embodiment of the utility model;
fig. 3 is a graph of curvature of field versus distortion for an optical system having a long exit pupil distance eyepiece according to an embodiment of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In embodiments of the utility model, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
Referring to fig. 1, an embodiment of the present utility model provides an optical system having a long exit pupil distance eyepiece, the optical system including, in order from an object side to an image side along an optical axis thereof, a first lens, a second lens, a third lens, and a fourth lens; the first lens and the second lens are glued into a glued lens; the focal power of the first lens is negative, and the focal power of the second lens is positive; the focal power of the third lens is positive; the focal power of the fourth lens is positive.
Optionally, the first lens comprises a biconvex lens, the second lens comprises a meniscus lens, the third lens comprises a meniscus lens, and the fourth lens comprises an aspherical lens.
Specifically, light rays are emitted from a diaphragm (STO) into a first lens (1) and a second lens (2) which are glued into a glued lens through ultraviolet light photosensitive glue, wherein the first lens is a biconvex lens, the focal power is negative, the second lens is a meniscus concave lens, the focal power is positive, the glued surface (S2) of the second lens is a concave surface, and the rear surface (S3) is a convex surface; the light rays are emitted into a third lens (3) after aberration correction of the cemented lens, wherein the third lens is a meniscus lens and has positive focal power, and the third lens provides most of focal power for an optical system; the optical power compensation of the third lens is used for injecting the light into the fourth lens (4), wherein the front surface (S6) and the rear surface (S7) of the fourth lens are both even-order aspheric surfaces, the fourth lens is used for correcting aberration and supplementing optical power for light, then injecting the light into the protective glass (5), and then injecting the light into the display (6) to finish imaging.
Referring to fig. 1, alternatively, the first surface, the bonding surface and the second surface of the bonding lens are spherical surfaces, the radius of curvature of the first surface is 85-95 mmmm, the radius of curvature of the bonding surface is-25-15 mm, and the radius of curvature of the second surface is-55-45 mmmm. The third surface and the fourth surface of the third lens are spherical, the curvature radius of the third surface is 15-25 mm, and the curvature radius of the fourth surface is 60-70 mm.
Optionally, the fifth surface and the sixth surface of the fourth lens are both even aspheric, the radius of curvature of the fifth surface is-25 to-15 mm, and the radius of curvature of the sixth surface is-15 to-5 mm.
Wherein, even aspheric surface satisfies formula:
where f is the sagittal height from the vertex of the even aspheric surface when the even aspheric surface is at a position with a height h along the optical axis direction, R is the curvature of the even aspheric surface, k is the conic coefficient, A, B, C, D, E, and both are high order term coefficients.
Specifically, referring to fig. 1, referring to table 1, parameters of an optical system of the long pupil distance eyepiece of the present utility model are referred to, and referring to the cone coefficients and the high order term coefficients of the even aspherical surfaces of table 2:
table 1 parameters of the optical system of the long pupil distance eyepiece of the utility model
In a specific embodiment, the first surface (S1) of the cemented lens formed by the first lens and the second lens has a radius of curvature of 80mm, a thickness of 7.0mm, a refractive index of 1.69Nd, and an abbe number of 54.5Vd; the curvature radius of the bonding surface (S2) is-20 mm, the thickness is 2.5mm, the refractive index is 1.92Nd, and the Abbe number is 18.9Vd; the second surface (S3) has a radius of curvature of-51 mm and a thickness of 1.0mm; the front surface (S4) of the third lens is a sphere with a radius of curvature of 20.9mm, a thickness of 5.5mm, a refractive index of 1.91Nd and an Abbe number of 35.3Vd; the rear surface (S5) of the third lens is a sphere, the curvature radius of the third lens is 65.0mm, and the thickness of the third lens is 8.4mm; the front surface (S6) of the fourth lens is an even aspheric surface, the curvature radius is-18.5 mm, the thickness is 4.5mm, the refractive index is 1.64Nd, and the Abbe number is 23.5Vd; the rear surface (S7) of the fourth lens is an even aspherical surface, and the curvature radius is-11.0 mm and the thickness is 5.8mm.
TABLE 2 Cone coefficient and higher order term coefficient of even aspherical surfaces
| Facial sequence | Coefficient of taper k | A | B | C | D | E | F |
| S6 | 1.5<|k|<2 | 5E-5～5.5E-5 | 2E-6～2.5E-6 | -3.3E-8～-2.7E-8 | 2E-10～2.5E-10 | -9.3E-13～-8.8E-13 | 1E-15～1.5E-15 |
| S7 | 0<|k|<0.05 | 4E-4～4.5E-4 | -1.5E-6～-1E-6 | 6E-8～6.5E-8 | -1.5E-11～-1E-11 | 1E-11～1.5E-11 | -4.3E-14～-3.8E-14 |
Optionally, the focal length f of the optical system has the following relationship with the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, and the focal length f4 of the fourth lens: 9.5< |f/f1| <10.5;8.5< |f/f2| <9.5. 1< |f/f3| <2;1.2< |f/f4| <2.2.
Referring to fig. 1, optionally, the materials of the first, second and third lenses each include an optical glass material, and the material of the fourth lens includes an optical resin material.
Specifically, the first lens 1, the second lens 2 and the third lens 3 are made of optical glass materials, the fourth lens 4 is made of optical resin materials, and the eyepiece has the characteristics of light weight, easiness in processing and low cost through reasonable selection of the materials.
Wherein the exit pupil distance is the distance of the stop to the front surface S1 of the first lens 1.
In a specific embodiment, the ratio of the exit pupil distance of the optical system to the total focal length of the optical system is 1.9-2.1, the magnification of the optical system is 10-15 times, the exit pupil distance of the optical system is 40-45mm, the exit pupil diameter of the optical system is 6mm, the total focal length of the optical system is 20-25mm, the exit pupil distance is 40-45mm, and the allowed eye movement range: 5D, working wavelength 480-650nm, display size 1024*768 7.8um 0.4 inches.
Referring to fig. 2, an MTF (Modulation Transfer Function ) graph of an optical system with a long exit pupil distance eyepiece is provided in an embodiment of the utility model: the abscissa of the MTF graph is the spatial frequency, the unit is the logarithm of lines per millimeter, the ordinate is the MTF value, the MTF can reflect the imaging quality of the optical system, and the smoother the MTF curve transition, the higher the imaging quality of the optical system. From the graph, the MTF of the optical system reaches 0.11 in the edge view field at the spatial frequency of 40lp/mm, and the requirement of human eye observation can be met.
Referring to fig. 3, an embodiment of the present utility model provides a graph of curvature of field versus distortion for an optical system having a long exit pupil distance eyepiece: the distortion curve is a field curve and a distortion curve of an optical system when light with three different wavelengths of 486nm (A), 587nm (B) and 656nm (C) are respectively formed, and the ordinate is an angle of view. The field curvature is an aberration of an object plane forming a curved image, and is characterized by meridian and sagittal field curvature, and the excessive two aberrations seriously affect the off-axis ray imaging quality of an optical system. When the distortion of the system is less than 4%, the distortion is difficult to be perceived by human eyes, and as can be seen from the figure, the field curvature maximum of the optical system at the wavelength of 587nm is about 0.64, and the distortion maximum is about 2.5%, so that the distortion is small and is difficult to be perceived.
The embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides an optical system with a long exit pupil distance ocular, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along an optical axis from an object side to an image side; the first lens and the second lens are glued into a glued lens; the focal power of the first lens is negative, and the focal power of the second lens is positive; the focal power of the third lens is positive; the focal power of the fourth lens is positive. The aberration of the optical system is corrected through the cemented lens, most of optical power is provided for the optical system through the third lens, the aberration of the optical system is corrected through the fourth lens, and the optical system is supplemented with light focus, so that the cemented lens has large exit pupil diameter and long exit pupil distance, and is suitable for application of handheld observation equipment.
The embodiment of the utility model uses the resin material to have lower cost and lighter weight, so that the whole lens has lighter weight and lower price; the cost for manufacturing the aspheric surface by using the glass material is generally high, and the cost for mass production after the mold is opened is low because the resin material can be molded by using the mold; the exit pupil distance of the optical system reaches 40-45mm, the optical system is long in the distance from the ocular lens, the distortion of the optical system is small, the imaging quality is good, and the optical system is more convenient and more comfortable to use when the ocular lens is installed, the ocular lens or goggles are worn and other scenes.
While the preferred embodiment of the present utility model has been described in detail, the utility model is not limited to the embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the utility model, and these equivalent modifications and substitutions are intended to be included in the scope of the present utility model as defined in the appended claims.
Claims (10)
1. An optical system having a long exit pupil distance eyepiece, said optical system comprising, in order from an object side to an image side along an optical axis thereof: a first lens, a second lens, a third lens, and a fourth lens; the first lens and the second lens are composed of a cemented lens, the focal power of the first lens is negative, the focal power of the second lens is positive, the focal power of the third lens is positive, and the focal power of the fourth lens is positive.
2. The optical system with long exit pupil distance eyepiece of claim 1, wherein the first lens comprises a biconvex lens, the second lens comprises a meniscus lens, the third lens comprises a meniscus lens, and the fourth lens comprises an aspheric lens.
3. The optical system with long exit pupil distance eyepiece of claim 1, wherein the first surface, the cemented surface, and the second surface of the cemented lens are spherical, the radius of curvature of the first surface ranges from 85 to 95mmmm, the radius of curvature of the cemented surface ranges from-25 to-15 mm, and the radius of curvature of the second surface ranges from-55 to-45 mmmm.
4. The optical system with long exit pupil distance eyepiece of claim 1, wherein the third surface and fourth surface of the third lens are spherical, the radius of curvature of the third surface ranges from 15 to 25mm, and the radius of curvature of the fourth surface ranges from 60 to 70mm.
5. The optical system with long exit pupil distance eyepiece of claim 1, wherein the material of the first, second, or third lenses each comprise an optical glass material and the material of the fourth lens comprises an optical resin material.
6. The optical system with long exit pupil distance eyepiece of claim 1, wherein the fifth surface and the sixth surface of the fourth lens are both even-order aspheric surfaces, the fifth surface has a radius of curvature ranging from-25 to-15 mm, and the sixth surface has a radius of curvature ranging from-15 to-5 mm.
7. The optical system with long exit pupil distance eyepiece of any one of claims 1-5 wherein the focal length f of the optical system has the following relationship with the focal length f1 of the first lens: 9.5< |f/f1| <10.5.
8. The optical system with long exit pupil distance eyepiece of any one of claims 1-5 wherein the focal length f of the optical system has the following relationship with the focal length f2 of the second lens: 8.5< |f/f2| <9.5.
9. The optical system with long exit pupil distance eyepiece of any one of claims 1-5 wherein the focal length f of the optical system has the following relationship with the focal length f3 of the third lens: 1< |f/f3| <2.
10. The optical system with long exit pupil distance eyepiece of any one of claims 1-5 wherein the focal length f of the optical system has the following relationship with the focal length f4 of the fourth lens: 1.2< |f/f4| <2.2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320138787.2U CN219676368U (en) | 2023-01-31 | 2023-01-31 | Optical system with long exit pupil distance eyepiece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320138787.2U CN219676368U (en) | 2023-01-31 | 2023-01-31 | Optical system with long exit pupil distance eyepiece |
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| CN219676368U true CN219676368U (en) | 2023-09-12 |
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| CN202320138787.2U Active CN219676368U (en) | 2023-01-31 | 2023-01-31 | Optical system with long exit pupil distance eyepiece |
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- 2023-01-31 CN CN202320138787.2U patent/CN219676368U/en active Active
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