TW201901217A - Eyepiece optical system - Google Patents

Abstract

An ocular optical system configured to allow imaging rays from a display image to enter an observer's eye through the ocular optical system so as to form an image is provided. A direction toward the eye is an eye side, and a direction toward the display image is a display side. The ocular optical system includes a first lens element, a second lens element, and a third lens element arranged along an optical axis in sequence from the eye side to the display side. Each of the first to third lens elements has an eye-side surface and a display-side surface. An optical axis region of the eye-side surface of the first lens element is convex, a periphery region of the eye-side surface of the second lens element is convex, and a periphery region of the eye-side surface of the third lens element is concave.

Description

Eyepiece optical system

The present invention relates to an optical system, and particularly to an eyepiece optical system.

Virtual reality (VR) is the use of computer technology to generate a virtual world in a three-dimensional space, providing users with sensory simulations of vision, hearing, etc., so that users can feel personally in the world. At present, the existing VR devices are mainly based on visual experience. The stereoscopic vision is achieved by simulating the parallax of the human eye by splitting the pictures corresponding to the two different angles of view of the left and right eyes. In order to reduce the size of the virtual reality device and allow users to get a magnified visual experience through the smaller display screen, the eyepiece optical system with magnification function has become one of the topics of VR research and development.

The existing half-eye viewing angle of the eyepiece optical system is small, which makes the viewer feel narrow vision, low resolution, and severe aberrations so that the display screen must be compensated for aberrations. In addition, the chromatic aberration is obviously difficult to meet the needs of users. Therefore, how to increase the half-eye viewing angle and enhance the imaging quality is a problem that needs to be improved in the eyepiece optical system.

The invention provides an eyepiece optical system, which can effectively increase the half-eye viewing angle and enhance the imaging quality.

An embodiment of the present invention proposes an eyepiece optical system for imaging light rays from a display screen to enter the eye of an observer through the eyepiece optical system for imaging. The direction toward the eyes is the eye side, and the direction toward the display screen is the display side. The eyepiece optical system includes a first lens, a second lens, and a third lens in sequence along an optical axis from the eye side to the display side. The first lens to the third lens each have a mesh side facing the eye side and passing the imaging light, and a display side facing the display side and passing the imaging light. An optical axis area of the eye side of the first lens is convex, a circumferential area of the eye side of the second lens is convex, and a circumferential area of the eye side of the third lens is concave. The eyepiece optical system conforms to: TL/G3D≦4.600; and 0.800≦G3D/(T1+AAG), where TL is a distance on the optical axis from the eye side of the first lens to the display side of the third lens, and G3D is the third A distance from the lens to the display screen on the optical axis, T1 is a thickness of the first lens on the optical axis, and AAG is the sum of the three air gaps of the first lens to the third lens on the optical axis. The lenses with refractive power in the eyepiece optical system include only the first lens, the second lens, and the third lens.

Based on the above, since an optical axis region of the eye side of the first lens of the eyepiece optical system of the embodiment of the present invention is convex, a circumferential region of the eye side of the second lens is convex, and a The circumferential area is concave, so the half-eye viewing angle of the eyepiece optical system can be effectively increased, and the imaging quality of the eyepiece optical system can be enhanced.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

Generally speaking, the light direction of the eyepiece optical system V100 is an imaging light VI exiting the display screen V50, enters the eye V60 through the eyepiece optical system V100, focuses on the retina of the eye V60, and produces an enlarged virtual image VV at the virtual image distance VD, such as Figure 1. The judgment criterion for explaining the optical specifications of the case below is to assume that the direction of the light rays is reversely tracking (reversely tracking) as a parallel imaging ray from the eye side through the eyepiece optical system to the focused image of the display screen.

The optical system in this specification includes at least one lens that receives imaging light from the incident optical system parallel to the optical axis to a half-eye viewing angle (ω) relative to the optical axis. The imaging light is imaged on the display screen through the optical system. The term "a lens has positive refractive power (or negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "eye side (or display side) of the lens" is defined as the specific range of imaging light passing through the lens surface. The imaging rays include at least two types of rays: chief ray Lc and marginal ray Lm (as shown in FIG. 2). The eye side (or display side) of the lens can be divided into different areas according to different positions, including the optical axis area, the circumferential area, or one or more relay areas in some embodiments, the description of these areas will be detailed below set forth.

FIG. 2 is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: the center point and the conversion point. The center point of the lens surface is an intersection point of the surface and the optical axis I. As illustrated in FIG. 2, the first center point CP1 is located on the eye side 110 of the lens 100, and the second center point CP2 is located on the display side 120 of the lens 100. The conversion point is a point on the lens surface, and the tangent to this point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as a point where the edge light ray Lm passing through the lens surface in the radial direction intersects the lens surface. All conversion points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, if there are a plurality of conversion points on the surface of a single lens, the conversion points are named sequentially from the first conversion point in the radial outward direction. For example, the first conversion point TP1 (closest to the optical axis I), the second conversion point TP2 (as shown in FIG. 5), and the Nth conversion point (farthest from the optical axis I).

The range from the center point to the first conversion point TP1 is defined as the optical axis area, where the optical axis area includes the center point. The area where the Nth conversion point farthest from the optical axis I is radially outward to the optical boundary OB is defined as a circumferential area. In some embodiments, a relay region between the optical axis region and the circumferential region may be included. The number of relay regions depends on the number of conversion points.

After the light of the parallel optical axis I passes through an area, if the light is deflected toward the optical axis I and the intersection with the optical axis I is on the lens display side A2, the area is convex. After the rays of the parallel optical axis I pass through an area, if the intersection of the extension line of the light and the optical axis I is on the lens side A1, the area is concave.

In addition, referring to FIG. 2, the lens 100 may further include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly part 130 is generally used for assembling the lens 100 to a corresponding element (not shown) of an optical system. The imaging light does not reach the assembly part 130. The structure and shape of the assembling part 130 are only examples for explaining the present invention, and do not limit the scope of the present invention. The lens assembly 130 discussed below may be partially or completely omitted in the drawings.

Referring to FIG. 3, an optical axis region Z1 is defined between the center point CP and the first conversion point TP1. A circular zone Z2 is defined between the first conversion point TP1 and the optical boundary OB of the lens surface. As shown in FIG. 3, the parallel ray 211 intersects the optical axis I on the display side A2 of the lens 200 after passing through the optical axis region Z1, that is, the focal point of the parallel ray 211 passing through the optical axis region Z1 is located at the point R of the display side A2 of the lens 200. Since the light rays intersect the optical axis I on the display side A2 of the lens 200, the optical axis region Z1 is a convex surface. Conversely, the parallel rays 212 diverge after passing through the circumferential zone Z2. As shown in FIG. 3, the extension line EL after the parallel ray 212 passes through the circumferential area Z2 intersects the optical axis I on the eye side A1 of the lens 200, that is, the focal point of the parallel ray 212 through the circumferential area Z2 is located at the point M on the eye side A1 of the lens 200 . Since the extension line EL of the light rays intersects the optical axis I on the eye side A1 of the lens 200, the circumferential region Z2 is concave. In the lens 200 shown in FIG. 3, the first conversion point TP1 is the boundary between the optical axis region and the circumferential region, that is, the first conversion point TP1 is the boundary between the convex surface and the concave surface.

On the other hand, the judgment of the surface shape unevenness of the optical axis area can also be determined according to the judgment method of the ordinary knowledge in the field, that is, the optical axis area surface of the lens is judged by the sign of the paraxial curvature radius (abbreviated as R value) Shaped bumps. The R value can be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets of optical design software. For the eye surface, when the R value is positive, the optical axis area of the eye surface is determined to be convex; when the R value is negative, the optical axis area of the eye surface is determined to be concave. Conversely, regarding the display side, when the R value is positive, the optical axis region of the display side is determined to be concave; when the R value is negative, the optical axis region of the display side is determined to be convex. The result of this method is consistent with the result of the above method of determining the intersection point of the light/ray extension line and the optical axis. The method of determining the intersection point of the light/ray extension line and the optical axis is that the focus of the light with a parallel optical axis is located on the lens The surface side or the display side is used to judge the surface unevenness. The "one area is convex (or concave)", "one area is convex (or concave)" or "one convex (or concave) area" described in this manual can be used instead.

4 to 6 provide examples of judging the shape and boundary of the lens area in each case, including the aforementioned optical axis area, circumferential area, and relay area.

FIG. 4 is a radial cross-sectional view of the lens 300. Referring to FIG. 4, the display side 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis region Z1 and the circumferential region Z2 of the display side surface 320 of the lens 300 are shown in FIG. 4. The R value of the display side surface 320 is positive (that is, R>0), therefore, the optical axis region Z1 is concave.

In general, the area shape of each area bounded by the conversion point will be opposite to that of the adjacent area. Therefore, the conversion point can be used to define the change of the surface shape, that is, from the conversion point from a concave surface to a convex surface or from a convex surface to a concave surface. In FIG. 4, since the optical axis region Z1 is a concave surface and the surface shape changes at the switching point TP1, the circumferential region Z2 is a convex surface.

FIG. 5 is a radial cross-sectional view of the lens 400. Referring to FIG. 5, there is a first conversion point TP1 and a second conversion point TP2 on the eye side 410 of the lens 400. The optical axis region Z1 of the mesh side 410 is defined between the optical axis I and the first conversion point TP1. The R value of this mesh side surface 410 is positive (that is, R>0), therefore, the optical axis region Z1 is a convex surface.

A circumferential region Z2 is defined between the second conversion point TP2 and the optical boundary OB of the eye side surface 410 of the lens 400, and the circumferential region Z2 of the eye side surface 410 is also a convex surface. In addition, the relay zone Z3 is defined between the first transition point TP1 and the second transition point TP2, and the relay zone Z3 of the mesh side 410 is a concave surface. Referring again to FIG. 5, the mesh side 410 sequentially includes the optical axis region Z1 between the optical axis I and the first conversion point TP1 radially outward from the optical axis I, and is located between the first conversion point TP1 and the second conversion point TP2 Relay zone Z3, and the circumferential zone Z2 between the second transition point TP2 and the optical boundary OB of the eye side 410 of the lens 400. Since the optical axis region Z1 is a convex surface, the surface shape changes from the first conversion point TP1 to a concave surface, so the relay region Z3 is a concave surface, and the surface shape changes from the second conversion point TP2 to a convex surface, so the circumferential region Z2 is a convex surface.

6 is a radial cross-sectional view of the lens 500. FIG. The eye side 510 of the lens 500 has no switching point. For a lens surface without a conversion point, for example, the eye side 510 of the lens 500, define 0-50% of the distance from the optical axis I to the optical boundary OB of the lens surface as the optical axis region, and from the optical axis I to the lens surface optics 50 to 100% of the distance between the boundaries OB is the circumferential area. Referring to the lens 500 shown in FIG. 6, 50% of the distance from the optical axis I to the optical boundary OB of the surface of the lens 500 from the optical axis I is defined as the optical axis region Z1 of the eye side 510. The R value of the side surface 510 is positive (that is, R>0), therefore, the optical axis region Z1 is convex. Since the eye side 510 of the lens 500 has no switching point, the circumferential area Z2 of the eye side 510 is also convex. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential zone Z2.

7 is a schematic diagram of an eyepiece optical system of a first embodiment of the present invention, and FIGS. 8A to 8D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the first embodiment. Please refer to FIG. 7 first, the eyepiece optical system 10 of the first embodiment of the present invention is used to make the imaging light of the display screen 99 enter the observer’s eye through the eyepiece optical system 10 and the pupil 0 of the observer’s eye to form an image, and display the screen It can be perpendicular to the optical axis or an angle not equal to 90 degrees with the optical axis. The eye side A1 is the side facing the direction of the observer's eyes, and the display side A2 is the side facing the direction of the display screen 99. In the present embodiment, the eyepiece optical system 10 includes a first lens 1, a second lens 2 and a third lens 3 in sequence along an optical axis I from the eye side A1 to the display side A2. When the imaging light of the display screen 99 is emitted, it will pass through the third lens 3, the second lens 2 and the first lens 1 in sequence, and then enter the eyes of the observer through the pupil 0 of the observer. Then, the imaging light will form an image on the retina of the observer's eye. Specifically, the first lens 1 to the third lens 3 of the eyepiece optical system 10 each have an eye side 15, 25, 35 that faces the eye side A1 and passes the imaging light, and a display side that faces the display side A2 and passes the imaging light 16, 26, 36.

In addition, in order to meet the demand for lightweight products, the first lens 1, the second lens 2 and the third lens 3 all have refractive power and are made of plastic materials, but the first lens 1, the second lens 2 and the third The material of the lens 3 is not limited to this. In the present embodiment, the lenses with refractive power in the eyepiece optical system 10 are only the first lens 1, the second lens 2, and the third lens 3.

The first lens 1 has a positive refractive power. The optical axis region 151 of the eye side surface 15 of the first lens 1 is a convex surface, and the circumferential region 153 thereof is a convex surface. The optical axis region 161 of the display side surface 16 of the first lens 1 is convex, and its circumferential region 163 is convex. The second lens 2 has a positive refractive power. The optical axis region 251 of the eye side surface 25 of the second lens 2 is convex, and its circumferential region 253 is convex. In this embodiment, the display side 26 of the second lens 2 is a Fresnel surface (Fresnel surface) 265, that is, the surface of the Fresnel lens. The surface of the Fresnel lens has a plurality of concentric ring-shaped teeth, which surround a central convex surface, and each ring-shaped tooth has an effective sub-surface capable of refracting incident light to a predetermined direction and an ineffective sub-surface connecting two adjacent effective sub-surfaces. In addition, the central convex surface can also refract incident light to a predetermined direction. The optical axis region 261 of the display side surface 26 of the second lens 2 is convex, and its circumferential region 263 is convex. The third lens 3 has a negative refractive power, the optical axis region 352 of the eye side 35 of the third lens 3 is concave, and the circumferential region 354 thereof is concave. The optical axis region 362 of the display side surface 36 of the third lens 3 is concave, and its circumferential region 363 is convex.

The other detailed optical data of the first embodiment is shown in FIG. 9. The overall focal length (EFL) of the eyepiece optical system 10 of the first embodiment is 34.853 millimeters (millimeter, mm), the half apparent field of view (ω) is 45.012∘, and the aperture value (f -number, Fno) is 6.971. Specifically, the "aperture value" in this specification is an aperture value calculated by considering the pupil 0 of the observer as the entrance pupil based on the principle of light reversibility. In addition, the display circle 99 (image circle diameter, ICD) corresponding to the maximum single-eye viewing angle of the observer of the eyepiece optical system 10 of the first embodiment is 49.5 mm, where the display image circle is the observer The maximum display frame range that can be seen through the eyepiece optical system 10 for a single eye, and the total track length (TTL) of the eyepiece optical system 10 of the first embodiment is 41.200 mm, where TTL is the eye side 15 of the first lens 1 to the display The distance of the picture 99 on the optical axis I. In addition, the effective radius in FIG. 9 means half of the optical effective diameter (clear aperture).

In this embodiment, the mesh sides 15, 25, and 35 are aspherical, the sides 16 and 36 are shown to be aspherical, and the side 26 is shown to be a Fresnel surface 265, where the effective element of each ring tooth of the Fresnel surface 265 is The surface and the central convex surface are aspherical, and the following shows that the aspherical coefficient of the side surface 26 is used to represent the effective sub-surface and the central convex surface of the ring teeth of the Fresnel surface 265, and these aspherical surfaces are defined according to the following formulas: -----------(1) where: Y: the vertical distance between the point on the aspheric curve and the optical axis I; Z: the depth of the aspheric surface (the point on the aspheric surface from the optical axis I is Y , And the tangent plane tangent to the vertex on the aspheric optical axis I, the vertical distance between the two); R: radius of curvature of the lens surface near the optical axis I; K: conic constant; a _i : The aspheric coefficient of order i.

The aspherical surface coefficients in the formula (1) of the mesh sides 15, 25, 35 and the display sides 16, 26, 36 are shown in FIG. Wherein, the field number 15 in FIG. 10 indicates that it is the aspherical coefficient of the eye side 15 of the first lens 1, and the other fields are deduced by analogy.

In addition, the relationship between important parameters in the eyepiece optical system 10 of the first embodiment is shown in FIG. 31. Where EFL is the system focal length of the eyepiece optical system 10, that is, the effective focal length (EFL) of the eyepiece optical system 10; ω is the half apparent field of view of the eyepiece optical system 10, which is the observer’s Half field of view, as shown in Figure 1; T1 is the thickness of the first lens 1 on the optical axis I; T2 is the thickness of the second lens 2 on the optical axis I; T3 is the third lens 3 on the optical axis I G12 is the distance from the display side 16 of the first lens 1 to the eye side 25 of the second lens 2 on the optical axis I, that is, the air gap between the first lens 1 and the second lens 2 on the optical axis I; G23 Is the distance between the display side 26 of the second lens 2 and the eye side 35 of the third lens 3 on the optical axis I, that is, the air gap between the second lens 2 and the third lens 3 on the optical axis I; G3D is the third lens 3 is the distance from the display side 36 to the display screen 99 on the optical axis I; TTL is the distance from the eye side 15 of the first lens 1 to the display screen 99 on the optical axis I; TL is the eye side 15 of the first lens 1 to The distance of the display side 36 of the third lens 3 on the optical axis I; ER is the exit pupil distance (Eye relief), which is the distance from the pupil 0 of the observer to the eye side 15 of the first lens 1 on the optical axis I; SL Is the length of the system, the distance from the observer’s pupil 0 to the display screen 99 on the optical axis I; EPD is the exit pupil diameter D1 (Eye pupil diameter, shown in FIG. 1) of the eyepiece optical system 10, which corresponds to the observation The diameter of the pupil's pupil 0 is, for example, 3 mm during the day and 7 mm at night, as shown in FIG. 1; ICD is the diameter D2 of the display image circle of the display screen 99 corresponding to the maximum viewing angle of the observer’s single eye ( Image circle diameter, as shown in Figure 1); VD is the distance of the virtual image, which is the distance between the enlarged virtual image VV and the observer's pupil 0 (ie, the exit pupil), as shown in Figure 1, the virtual image distance VD, where the eye can The closest distance for clear focusing is called the clear vision distance, and the clear vision distance for young people is usually 250 mm; ALT is the sum of the lens thicknesses of the first lens 1 to the third lens 3 on the optical axis I, namely T1, T2 and T3 The sum; AAG is the sum of the two air gaps of the first lens 1 to the third lens 3 on the optical axis I, that is, the sum of G12 and G23; R1 is the optical effective radius of the eye side 15 of the first lens 1 (half of clear aperture); R2 is the optical effective radius of the eye side 25 of the second lens 2; R3 is the optical effective radius of the eye side 35 of the third lens 3; In addition, redefinition: f1 is the focal length of the first lens 1; f2 Is the focal length of the second lens 2; f3 is the focal length of the third lens 3; n1 is the refractive index of the first lens 1; n2 is the refractive index of the second lens 2; n3 is the third lens The refractive index of 3; V1 is the Abbe number of the first lens 1; V2 is the Abbe number of the second lens 2; V3 is the Abbe number of the third lens 3.

With reference to FIGS. 8A to 8D, FIG. 8A to FIG. 8D are various aberration diagrams of the eyepiece optical system of the first embodiment, and it is assumed that the direction of the light is reversely traced as a parallel imaging light. The eye side A1 sequentially passes through the pupil 0 and various aberration diagrams obtained by focusing and imaging the eyepiece optical system 10 to the display screen 99. In this embodiment, the various aberrations shown in the aberration diagrams above determine the various aberrations of the imaging light from the display screen 99 to the retina of the observer's eye. That is to say, when the aberrations shown in the above aberration diagrams are small, the aberrations of the retina imaging of the observer's eyes will also be small, so that the observer can watch the imaging quality Good image.

Specifically, the diagram of FIG. 8A illustrates the longitudinal spherical aberration of the first embodiment, and the diagrams of FIGS. 8B and 8C respectively illustrate the curvature of field in the sagittal direction of the first embodiment ( field curvature) and the field curvature aberration in the tangential direction. The diagram of FIG. 8D illustrates the distortion aberration of the first embodiment. 8A of the longitudinal spherical aberration diagram of the first embodiment is simulated when the pupil radius (pupil radius) is 2.5000 mm (that is, when the exit pupil diameter EPD of the eyepiece optical system 10 is 5.000 mm). In addition, in the longitudinal spherical aberration diagram of the first embodiment in FIG. 8A, the curve formed by each wavelength is very close and close to the middle, indicating that the off-axis rays of different heights of each wavelength are concentrated near the imaging point. The deflection amplitude of the curve of each wavelength can be seen, the deviation of the imaging point of off-axis light of different heights is controlled within ±0.28 mm, so this embodiment does significantly improve the spherical aberration of the same wavelength. In addition, 486 nm The distances between the three representative wavelengths of 588 nm and 656 nm are also quite close to each other, and the imaging positions representing light of different wavelengths have been quite concentrated, so that the chromatic aberration is also significantly improved.

In the two field curvature aberration diagrams of FIGS. 8B and 8C, the field curvature aberrations of the three representative wavelengths within the entire field of view fall within the range of ±3.5 mm, which illustrates the eyepiece optical system of the first embodiment 10 can effectively eliminate aberrations. The distortion aberration diagram of FIG. 8D shows that the distortion aberration of the first embodiment is maintained within ±30%, indicating that the distortion aberration of the first embodiment has met the imaging quality requirements of the optical system, and accordingly This means that compared with the existing eyepiece optical system, the first embodiment can still provide better imaging quality under the condition that the TTL has been shortened to about 41.200 mm, so the first embodiment can maintain good optical performance Shorten the eyepiece optical system to achieve a thin product design. In addition, the eyepiece optical system 10 of the first embodiment has a large viewing angle, and can correct aberrations while maintaining good imaging quality.

11 is a schematic diagram of an eyepiece optical system of a second embodiment of the present invention, and FIGS. 12A to 12D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the second embodiment. Referring first to FIG. 11, a second embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows. The second embodiment is more or less different from the first embodiment in each optical data, aspheric coefficient, and parameters of the first lens 1 to the third lens 3. In addition, in the second embodiment, the circumferential area 154 of the eye side 15 of the first lens 1 is concave, and the circumferential area 364 of the display side 36 of the third lens 3 is concave. It should be noted here that in order to clearly show the drawing, the reference numerals of the optical axis area and the circumferential area similar to the first embodiment are omitted in FIG. 11.

The detailed optical data of the eyepiece optical system 10 of the second embodiment is shown in FIG. 13, and the overall system focal length of the eyepiece optical system 10 of the second embodiment is 36.586 mm, the half-eye viewing angle (ω) is 39.997∘, and the aperture value ( Fno) is 7.317, ICD is 50 mm, and TTL is 43.760 mm.

As shown in FIG. 14, it is the aspherical coefficients in the formula (1) of the eye sides 15, 25, and 35 and the display sides 16, 26, and 36 of the first lens 1 to the third lens 3 of the second embodiment. .

In addition, the relationship between important parameters in the eyepiece optical system 10 of the second embodiment is shown in FIG. 31.

The longitudinal spherical aberration diagram 12A of the second embodiment is simulated when the pupil radius is 2.000 mm (that is, when the exit pupil diameter EPD of the eyepiece optical system 10 is 4.000 mm). In the longitudinal spherical aberration diagram of the second embodiment in FIG. 12A, the deviation of the imaging point of off-axis rays of different heights is controlled within a range of ±0.28 mm. In the two field curvature aberration diagrams of FIGS. 12B and 12C, the field curvature aberrations of the three representative wavelengths within the entire field of view fall within the range of ±1.1 mm. The distortion aberration diagram of FIG. 12D shows that the distortion aberration of the second embodiment is maintained within a range of ±19%. According to this, compared with the existing eyepiece optical system, the second embodiment can still provide better imaging quality under the condition that the TTL has been shortened to about 43.760 mm.

It can be known from the above description that the second embodiment has an advantage over the first embodiment in that the field curvature of the second embodiment is smaller than that of the first embodiment, and the distortion aberration of the second embodiment is smaller than that of the first embodiment The distortion aberration of the embodiment. In addition, the thickness difference between the optical axis and the circumferential area of the lens of the second embodiment is smaller than that of the first embodiment, so the second embodiment is easier to manufacture than the first embodiment, so the yield is higher.

15 is a schematic diagram of an eyepiece optical system of a third embodiment of the present invention, and FIGS. 16A to 16D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the third embodiment. Referring first to FIG. 15, a third embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the main differences between the two are as follows. The optical data, aspheric coefficients, and parameters of the first lens 1 to the third lens 3 of the third embodiment are more or less different from those of the first embodiment. Furthermore, in the third embodiment, the circumferential area 364 of the display side 36 of the third lens 3 is concave. It should be noted here that in order to clearly show the drawing, the reference numerals of the optical axis area and the circumferential area similar to the first embodiment are omitted in FIG. 15.

The detailed optical data of the eyepiece optical system 10 of the third embodiment is shown in FIG. 17, and the overall system focal length of the eyepiece optical system 10 of the third embodiment is 37.170 mm, the half-eye viewing angle (ω) is 45.100∘, and the aperture value ( Fno) is 7.434, ICD is 64 mm, and TTL is 46.580 mm.

As shown in FIG. 18, it is the aspheric coefficients in the formula (1) of the eye sides 15, 25, and 35 and the display sides 16, 26, and 36 of the first lens 1 to the third lens 3 of the third embodiment. .

In addition, the relationship between important parameters in the eyepiece optical system 10 of the third embodiment is shown in FIG. 31.

The longitudinal spherical aberration diagram 16A of the third embodiment is simulated when the pupil radius is 2.5000 mm (that is, when the exit pupil diameter EPD of the eyepiece optical system 10 is 5.000 mm). In the longitudinal spherical aberration diagram of this third embodiment, in FIG. 16A, the deviation of the imaging point of off-axis rays of different heights is controlled within a range of ±0.36 mm. In the two field curvature aberration diagrams of FIGS. 16B and 16C, the field curvature aberrations of the three representative wavelengths within the entire field of view fall within the range of ±1.6 mm. The distortion aberration diagram of FIG. 16D shows that the distortion aberration of the third embodiment is maintained within a range of ±15%. According to this, compared with the existing eyepiece optical system, the third embodiment can still provide better imaging quality under the condition that the TTL has been shortened to about 46.580 mm.

It can be seen from the above description that the third embodiment has an advantage over the first embodiment in that the third embodiment has a half-eye viewing angle greater than that of the first embodiment, and the third embodiment has a smaller field curvature than the first embodiment. The field curvature of the embodiment, and the distortion aberration of the third embodiment is smaller than that of the first embodiment. In addition, the thickness difference between the optical axis and the circumferential area of the lens of the third embodiment is smaller than that of the first embodiment, so the third embodiment is easier to manufacture than the first embodiment, so the yield is higher.

19 is a schematic diagram of an eyepiece optical system of a fourth embodiment of the present invention, and FIGS. 20A to 20D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the fourth embodiment. Referring first to FIG. 19, a fourth embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the main differences between the two are as follows. The optical data, aspheric coefficients, and parameters of the first lens 1 to the third lens 3 of the fourth embodiment are more or less different from those of the first embodiment. Furthermore, in the fourth embodiment, the circumferential area 364 of the display side 36 of the third lens 3 is concave. It should be noted here that in order to clearly show the drawing, the reference numerals of the optical axis area and the circumferential area similar to the first embodiment are omitted in FIG. 19.

The detailed optical data of the eyepiece optical system 10 is shown in FIG. 21, and the overall system focal length of the eyepiece optical system 10 of the fourth embodiment is 40.517 mm, the half-eye viewing angle (ω) is 44.949∘, and the aperture value (Fno) is 8.103, The ICD is 71 mm and the TTL is 50.290 mm.

As shown in FIG. 22, it is the aspherical coefficients in the formula (1) of the eye sides 15, 25, and 35 and the display sides 16, 26, and 36 of the first lens 1 to the third lens 3 of the fourth embodiment. .

In addition, the relationship between important parameters in the eyepiece optical system 10 of the fourth embodiment is shown in FIG. 31.

The longitudinal spherical aberration diagram 20A of the fourth embodiment is simulated when the pupil radius is 2.5000 mm (that is, when the exit pupil diameter EPD of the eyepiece optical system 10 is 5.000 mm). In the longitudinal spherical aberration diagram of the fourth embodiment in FIG. 20A, the deviation of the imaging point of off-axis light rays of different heights is controlled within a range of ±0.48 mm. In the two field curvature aberration diagrams of FIGS. 20B and 20C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within the range of ±2.4 mm. The distortion aberration diagram of FIG. 20D shows that the distortion aberration of the fourth embodiment is maintained within the range of ±13%. According to this, compared with the existing eyepiece optical system, the fourth embodiment can still provide better imaging quality under the condition that the TTL has been shortened to about 50.290 mm.

It can be known from the above description that the fourth embodiment has an advantage over the first embodiment in that the field curvature aberration of the fourth embodiment is smaller than that of the first embodiment, and the distortion image of the fourth embodiment The difference is smaller than the distortion aberration of the first embodiment. In addition, the thickness difference between the optical axis and the circumferential area of the lens of the fourth embodiment is smaller than that of the first embodiment, so the fourth embodiment is easier to manufacture than the first embodiment, so the yield is higher.

23 is a schematic diagram of an eyepiece optical system of a fifth embodiment of the present invention, and FIGS. 24A to 24D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the fifth embodiment. Referring first to FIG. 23, a fifth embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the main differences between the two are as follows. The optical data, aspheric coefficients, and parameters of the first lens 1 to the third lens 3 of the fifth embodiment are somewhat different from those of the first embodiment. In addition, in the fifth embodiment, the circumferential area 364 of the display side surface 36 of the third lens 3 is concave. It should be noted here that in order to clearly show the drawing, the reference numerals of the optical axis area and the circumferential area similar to the first embodiment are omitted in FIG. 23.

The detailed optical data of the eyepiece optical system 10 of the fifth embodiment is shown in FIG. 25, and the overall system focal length of the eyepiece optical system 10 of the fifth embodiment is 38.314 mm, the half-eye viewing angle (ω) is 40.138∘, and the aperture value ( Fno) is 7.663, ICD is 56 mm, and TTL is 47.310 mm.

As shown in FIG. 26, it is the aspheric coefficients of the first lens 1 to the third lens 3 of the fifth embodiment in the formula (1) for the eye sides 15, 25, and 35 and the display sides 16, 26, and 36 in formula (1) .

In addition, the relationship between important parameters in the eyepiece optical system 10 of the fifth embodiment is shown in FIG. 31.

The longitudinal spherical aberration diagram 24A of the fifth embodiment is simulated when the pupil radius is 2.5000 mm (that is, when the exit pupil diameter EPD of the eyepiece optical system 10 is 5.000 mm). In the longitudinal spherical aberration diagram of this fifth embodiment, in FIG. 24A, the deviation of the imaging point of off-axis rays of different heights is controlled within a range of ±0.42 mm. In the two field curvature aberration diagrams of FIGS. 24B and 24C, the field curvature aberrations of the three representative wavelengths within the entire field of view fall within the range of ±1.2 mm. The distortion aberration diagram of FIG. 24D shows that the distortion aberration of the fifth embodiment is maintained within the range of ±14%. According to this, compared with the existing eyepiece optical system, the fifth embodiment can still provide better imaging quality under the condition that the TTL has been shortened to about 47.310 mm.

It can be known from the above description that the fifth embodiment has an advantage over the first embodiment in that the field curvature of the fifth embodiment is smaller than that of the first embodiment, and the distortion aberration of the fifth embodiment is smaller than that of the first embodiment The distortion aberration of the embodiment. In addition, the difference in thickness between the optical axis and the circumferential area of the lens of the fifth embodiment is smaller than that of the first embodiment, so the fifth embodiment is easier to manufacture than the first embodiment, so the yield is higher.

FIG. 27 is a schematic diagram of an eyepiece optical system of a sixth embodiment of the present invention, and FIGS. 28A to 28D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the sixth embodiment. Referring first to FIG. 27, a sixth embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the main differences between the two are as follows. The optical data, aspheric coefficients, and parameters of the first lens 1 to the third lens 3 of the sixth embodiment are more or less different from those of the first embodiment. Further, in the sixth embodiment, the optical axis region 361 of the display side surface 36 of the third lens 3 is convex, and the circumferential region 364 of the display side surface 36 of the third lens 3 is concave. It should be noted here that, in order to clearly show the drawing, the reference numerals of the optical axis area and the circumferential area similar to the first embodiment are omitted in FIG. 27.

The detailed optical data of the eyepiece optical system 10 of the sixth embodiment is shown in FIG. 29, and the overall system focal length of the eyepiece optical system 10 of the sixth embodiment is 25.781 mm, the half-eye viewing angle (ω) is 45.303∘, and the aperture value ( Fno) is 5.156, ICD is 50 mm, and TTL is 41.320 mm.

As shown in FIG. 30, it is the aspherical coefficients in the formula (1) of the eye sides 15, 25, and 35 and the display sides 16, 26, and 36 of the first lens 1 to the third lens 3 of the sixth embodiment. .

In addition, the relationship between important parameters in the eyepiece optical system 10 of the sixth embodiment is shown in FIG. 31.

The longitudinal spherical aberration diagram 28A of the sixth embodiment is simulated when the pupil radius is 2.5000 mm (that is, when the exit pupil diameter EPD of the eyepiece optical system 10 is 5.000 mm). In the longitudinal spherical aberration diagram of this sixth embodiment, in FIG. 28A, the deviation of the imaging point of off-axis rays of different heights is controlled within a range of ±0.6 mm. In the two field curvature aberration diagrams of FIGS. 28B and 28C, the field curvature aberrations of the three representative wavelengths within the entire field of view fall within the range of ±2.3 mm. The distortion aberration diagram of FIG. 28D shows that the distortion aberration of the sixth embodiment is maintained within a range of ±4.5%. According to this, compared with the existing eyepiece optical system, the sixth embodiment can still provide better imaging quality under the condition that the TTL has been shortened to about 41.320 mm.

It can be seen from the above description that the sixth embodiment has an advantage over the first embodiment in that the half-eye viewing angle of the sixth embodiment is larger than that of the first embodiment, and the field curvature of the sixth embodiment is smaller than that of the first embodiment. Field curvature of the embodiment, and the distortion aberration of the sixth embodiment is smaller than that of the first embodiment.

Refer to Figure 31 again. FIG. 31 is a table diagram of various optical parameters of the first to sixth embodiments described above, wherein the units of the parameters of the columns “T1” to “EFL” are millimeters (mm).

When the relationship between the various optical parameters in the eyepiece optical system 10 of the embodiment of the present invention meets the following conditional formula or at least one of the following designs, it can help the designer to design with good optical performance and the overall length is effectively shortened And technically feasible eyepiece optical system:

1. The combination of the following designs can effectively increase the half-eye viewing angle and enhance the imaging quality: the optical axis area 151 of the eye side 15 of the first lens 1 is convex and the circumferential area 253 of the eye side 25 of the second lens 2 is convex The design is conducive to enlarging the image, and the design of the circumferential area 354 of the eye side 35 of the third lens 3 as a concave surface can effectively improve chromatic aberration and improve imaging quality.

2. 250 millimeters (mm) is the distance of clear vision, which is the closest distance that the young people's eyes can focus clearly. The magnification of the system can be approximated to the ratio of 250mm to EFL, so the eyepiece optical system 10 can meet 2.500≦250 mm /EFL≦25.000, so that the system magnification will not be too large, increasing the thickness of the lens and the difficulty of manufacturing, and the EFL will not be too long to affect the system length.

3. The eyepiece optical system 10 can satisfy at least one of the following conditional expressions, the purpose of which is to maintain the thickness and interval of each lens at an appropriate value, so as to avoid any one parameter being too large and not conducive to the overall thinning of the eyepiece optical system 10, or Avoid any parameter that is too small to affect the assembly or increase the difficulty of manufacturing: G23/(G12+T3)≦2.000, the preferred range is 0.600≦G23/(G12+T3)≦2.000; ALT/(T1+G12 +T3)≦1.700, the preferred range is 1.100≦ALT/(T1+G12+T3)≦1.700; T2/T3≦2.300, the preferred range is 1.500≦T2/T3≦2.300; T1/T2≦1.400, The preferred range is 0.700≦T1/T2≦1.400; T1/G23≦2.500, the preferred range is 1.000≦T1/G23≦2.500; (AAG+T1)/T2≦2.300, the preferred range is 1.500≦( AAG+T1)/T2≦2.300; ALT/T2≦3.300, the preferred range is 2.200≦ALT/T2≦3.300; AAG/G23≦1.200, the preferred range is 1.000≦AAG/G23≦1.200; (T1+ G12)/T2≦1.700, the preferred range is 0.800≦(T1+G12)/T2≦1.700; (T1+G12+T2+G23)/T3≦6.400, the preferred range is 3.900≦(T1+G12+ T2+G23)/T3≦6.400; 0.800≦G3D/(T1+AAG), the preferred range is 0.800≦G3D/(T1+AAG)≦2.200; 3.100≦ALT/AAG, the preferred range is 3.100≦ALT /AAG≦5.000; 1.300≦(G12+T2)/G23, the preferred range is 1.300≦(G12+T2)/G23≦2.000.

4. The eyepiece optical system 10 can satisfy the following conditional expressions, the purpose is to maintain the system focal length and optical parameters at an appropriate value, to avoid any one parameter is too large and not conducive to the correction of the overall aberration of the eyepiece optical system 10, or to avoid any A parameter that is too small affects assembly or improves the difficulty of manufacturing: EFL/G3D≦2.000, the preferred range is 1.400≦EFL/G3D≦2.000.

5. The eyepiece optical system 10 can satisfy at least one of the following conditional expressions, so that the ratio of the optical element parameter to the length of the eyepiece optical system 10 is maintained at an appropriate value, to avoid that the parameter is too small for manufacturing, or the parameter is too large to make the eyepiece optical The length of the system 10 is too long: TL/G3D≦4.600, the preferred range is 0.800≦TL/G3D≦4.600, the better range is 0.800≦TL/G3D≦2.500; TTL/(T3+G3D)≦2.500, preferably The range is 1.300≦TTL/(T3+G3D)≦2.500; TL/G23≦6.800, the preferred range is 3.600≦TL/G23≦6.800; 0.900≦EFL/TL, the preferred range is 0.900≦EFL/TL ≦2.000; 1.800≦TTL/ALT, the preferred range is 1.800≦TTL/ALT≦2.500; 1.400≦TTL/TL, the preferred range is 1.400≦TTL/TL≦2.500.

In view of the unpredictability of the design of the optical system, under the framework of the present invention, meeting the above-mentioned conditional formula can better make the eyepiece optical system 10 of the present invention have a shorter system length, a larger half-eye viewing angle, and a better Imaging quality, or better assembly yield improves the shortcomings of the prior art.

In addition, with regard to the above-mentioned exemplary limited relational expressions, arbitrarily and selectively unequal numbers can be combined and applied to the implementation of the present invention, which is not limited thereto. In the implementation of the present invention, in addition to the aforementioned relational expressions, additional details such as the concave-convex curved surface arrangement of the lens can be additionally designed for the lens to enhance the control of system performance and/or resolution. It should be noted that these details need to be selectively applied to other embodiments of the present invention without conflict.

The numerical ranges including the maximum and minimum values obtained by the combined proportional relationship of the optical parameters disclosed in the embodiments of the present invention can be implemented accordingly.

In summary, the longitudinal spherical aberration, field curvature aberration, and distortion of the embodiments of the present invention all conform to the usage specifications. In addition, 656 nanometers (red light), 588 nanometers (green light), 486 nanometers (blue light), three off-axis rays with different wavelengths at different heights are concentrated near the imaging point, and the deflection amplitude of each curve can be It can be seen that the deviation of the imaging point of off-axis light of different heights is controlled and has good spherical aberration, aberration, and distortion suppression capabilities. Further referring to the imaging quality data, the three representative wavelengths of 656 nanometers, 588 nanometers, and 486 nanometers are also very close to each other, showing that the embodiments of the present invention have good concentration of light of different wavelengths under various conditions and have excellent Since the dispersion suppression ability, it can be seen from the above that the embodiments of the present invention have good optical performance. Therefore, the eyepiece optical system of the embodiment of the present invention has the characteristics of lightness, thinness, and wide viewing angle, and has good optical imaging quality.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

0‧‧‧ pupil

1‧‧‧ First lens

10.V100‧‧‧Eyepiece optical system

100, 200, 300, 400, 500 ‧‧‧ lens

130‧‧‧Assembly Department

15, 25, 35, 110, 410, 510‧‧‧ mesh side

16, 26, 36, 120, 320 ‧‧‧ display side

2‧‧‧second lens

211, 212‧‧‧ parallel rays

265‧‧‧ Fresnel surface

3‧‧‧third lens

99, V50‧‧‧ display screen

A1‧‧‧Mesh side

A2‧‧‧Display side

CP‧‧‧Center

CP1‧‧‧First Center Point

CP2‧‧‧Second Center Point

D1‧‧‧Exit pupil diameter

D2‧‧‧Display the diameter of a circle

EL‧‧‧Extended line

I‧‧‧optic axis

Lm‧‧‧edge light

Lc‧‧‧ chief rays

OB‧‧‧Optical boundary

Intersection point of M, R‧‧‧

TP1‧‧‧First conversion point

TP2‧‧‧second conversion point

V60‧‧‧Eye

VD‧‧‧Virtual image distance

VI‧‧‧Imaging light

VV‧‧‧magnified virtual image

Z1, 151, 161, 251, 261, 352, 361, 362

Z2, 153, 154, 163, 253, 263, 354, 363, 364

ω‧‧‧ half-eye viewing angle

Z3‧‧‧ Relay area

FIG. 1 is a schematic diagram illustrating an eyepiece optical system. FIG. 2 is a schematic diagram illustrating the surface structure of a lens. FIG. 3 is a schematic diagram illustrating the surface uneven structure of a lens and the focus of light. FIG. 4 is a schematic diagram illustrating the surface structure of an example one lens. FIG. 5 is a schematic diagram illustrating the surface structure of a lens of Example 2. FIG. FIG. 6 is a schematic diagram illustrating the surface structure of a lens of Example 3. FIG. 7 is a schematic diagram of an eyepiece optical system according to the first embodiment of the invention. 8A to 8D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the first embodiment. 9 shows detailed optical data of the eyepiece optical system of the first embodiment of the present invention. FIG. 10 shows aspherical parameters of the eyepiece optical system of the first embodiment of the present invention. 11 is a schematic diagram of an eyepiece optical system according to a second embodiment of the invention. 12A to 12D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the second embodiment. 13 shows detailed optical data of the eyepiece optical system of the second embodiment of the present invention. FIG. 14 shows aspherical parameters of the eyepiece optical system of the second embodiment of the present invention. 15 is a schematic diagram of an eyepiece optical system of a third embodiment of the present invention. 16A to 16D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the third embodiment. FIG. 17 shows detailed optical data of the eyepiece optical system of the third embodiment of the present invention. Fig. 18 shows aspherical parameters of the eyepiece optical system of the third embodiment of the present invention. 19 is a schematic diagram of an eyepiece optical system according to a fourth embodiment of the invention. 20A to 20D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the fourth embodiment. FIG. 21 shows detailed optical data of the eyepiece optical system of the fourth embodiment of the present invention. Fig. 22 shows aspherical parameters of the eyepiece optical system of the fourth embodiment of the present invention. 23 is a schematic diagram of an eyepiece optical system according to a fifth embodiment of the invention. 24A to 24D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the fifth embodiment. FIG. 25 shows detailed optical data of the eyepiece optical system of the fifth embodiment of the present invention. Fig. 26 shows aspherical parameters of the eyepiece optical system of the fifth embodiment of the present invention. FIG. 27 is a schematic diagram of an eyepiece optical system according to a sixth embodiment of the invention. 28A to 28D are longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the sixth embodiment. FIG. 29 shows detailed optical data of the eyepiece optical system of the sixth embodiment of the present invention. FIG. 30 shows aspherical parameters of the eyepiece optical system of the sixth embodiment of the present invention. FIG. 31 shows the important parameters of the eyepiece optical systems of the first to sixth embodiments of the present invention and the values of their relational expressions.

Claims (20)

An eyepiece optical system is used to form imaging light rays from a display screen into an observer's eye through the eyepiece optical system for imaging. The direction toward the eye is the eye side, and the direction toward the display screen is the display side. The eyepiece optical system The eye side to the display side include a first lens, a second lens, and a third lens in sequence along an optical axis. The first lens to the third lens each have a direction toward the eye side and pass the imaging light A side surface of the eye and a display side facing the display side and passing the imaging light; an optical axis area of the eye side of the first lens is convex; a circumferential area of the eye side of the second lens is convex; A circumferential area of the eye side of the third lens is concave; and the eyepiece optical system conforms to: TL/G3D≦4.600; and 0.800≦G3D/(T1+AAG), where TL is the eye of the first lens A distance from the side to the display side of the third lens on the optical axis, G3D is a distance from the third lens to the display screen on the optical axis, and T1 is a distance of the first lens on the optical axis A thickness, and AAG is the sum of the two air gaps of the first lens to the third lens on the optical axis, and the lenses with refractive power in the eyepiece optical system are only the first lens and the second lens And the third lens. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with G23/(G12+T3)≦2.000, where G23 is the one from the second lens to the third lens on the optical axis For the air gap, G12 is an air gap between the first lens and the second lens on the optical axis, and T3 is a thickness of the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with ALT/(T1+G12+T3)≦1.700, where ALT is the first lens to the third lens on the optical axis The sum of the lens thicknesses of, G12 is an air gap between the first lens and the second lens on the optical axis, and T3 is a thickness of the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent scope, wherein the eyepiece optical system is more in line with T2/T3≦2.300, where T2 is a thickness of the second lens on the optical axis, and T3 is the third lens A thickness on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with TTL/(T3+G3D)≦2.500, where TTL is the eye side of the first lens to the display screen at the optical axis A distance above and T3 is a thickness of the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application range, wherein the eyepiece optical system is more in line with T1/T2≦1.400, where T2 is a thickness of the second lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with EFL/G3D≦2.000, where EFL is the system focal length of the eyepiece optical system. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with T1/G23≦2.500, where G23 is an air gap between the second lens and the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application range, wherein the eyepiece optical system is more in line with (AAG+T1)/T2≦2.300, where T2 is a thickness of the second lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with ALT/T2≦3.300, where ALT is the sum of the lens thicknesses of the first lens to the third lens on the optical axis, And T2 is a thickness of the second lens on the optical axis. The eyepiece optical system as described in item 1 of the patent scope, wherein the eyepiece optical system is more in line with AAG/G23≦1.200, where G23 is an air gap between the second lens and the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application range, wherein the eyepiece optical system is more in line with TL/G23≦6.800, where G23 is an air gap between the second lens and the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with (T1+G12)/T2≦1.700, where G12 is the one from the first lens to the second lens on the optical axis There is an air gap, and T2 is a thickness of the second lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with (T1+G12+T2+G23)/T3≦6.400, where G12 is the first lens to the second lens in the light An air gap on the axis, T2 is a thickness of the second lens on the optical axis, G23 is an air gap on the optical axis from the second lens to the third lens, and T3 is the third lens A thickness on the optical axis. The eyepiece optical system as described in item 1 of the patent application range, wherein the eyepiece optical system is more in conformity with 3.100≦ALT/AAG, where ALT is the sum of the lens thicknesses of the first lens to the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with 0.900≦EFL/TL, where EFL is the system focal length of the eyepiece optical system. The eyepiece optical system as described in item 1 of the patent scope, wherein the eyepiece optical system is more in line with 1.800≦TTL/ALT, where TTL is a distance from the eye side of the first lens to the display screen on the optical axis And ALT is the sum of the lens thicknesses of the first lens to the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent scope, wherein the eyepiece optical system is more in conformity with 1.400≦TTL/TL, where TTL is a distance from the eye side of the first lens to the display screen on the optical axis . The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in line with 1.300≦(G12+T2)/G23, where G12 is the first lens to the second lens on the optical axis For the air gap, T2 is a thickness of the second lens on the optical axis, and G23 is an air gap of the second lens to the third lens on the optical axis. The eyepiece optical system as described in item 1 of the patent application scope, wherein the eyepiece optical system is more in conformity with 2.500≦250mm/EFL≦25.000, where EFL is the system focal length of the eyepiece optical system.