TWI845026B - Optical lens module, optical engine and head mounted display - Google Patents

Abstract

An optical lens module is is configured to receive at least one image light beam from an image source side is provided. The optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along an optical axis from an object side to the image source side, and each of the ninth lenses includes an object-side surface facing the object-side and an image-side surface facing the image source side. The optical lens module has an aperture on the object-side. Wherein, the optical lens module is a secondary imaging optical system, and the refractive powers of the first lens , the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lene, the eighth lens and the ninth lens are respectively positive, negative, positive, negative, positive, negative, positive, negative, and positive, and the at least one image light beam is transmitted through the optical lens module and form an intermediate image between the aperture and the image source side.

Description

Optical lens module, optical machine module and head mounted display device

The present invention relates to an optical module and a display device, and in particular to an optical lens module, an optical machine module and a head-mounted display device.

Near Eye Display (NED) and Head-mounted Display (HMD) are both products with great development potential. The applications of near eye display technology can be divided into augmented reality (AR) technology and virtual reality (VR) technology. For augmented reality technology, developers are currently committed to providing the best image quality while making the device thinner and lighter.

However, in the optical engines currently used in near-eye displays or head-mounted displays, the field of view of the optical lens does not exceed 35 degrees. If the optical design is to increase the field of view, the size of the device will inevitably increase. If the geometric efficiency and brightness are to be improved at the same time, the aperture must be increased in the optical design, but this will increase the size of the device. Therefore, how to develop an optical engine with a large field of view, small size and large aperture is one of the goals that this field needs to work on.

The "prior art" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" section may contain some content that does not constitute the common knowledge of the person skilled in the art. The content disclosed in the "prior art" section does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by the person skilled in the art before the application of the present invention.

The present invention provides an optical lens module, an optical machine module and a head-mounted display device, which have small size, small effective optical diameter, large aperture, large field of view and good optical effect.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

To achieve one or part or all of the above purposes or other purposes, the present invention provides an optical lens module for receiving at least one image beam from an image source side. The optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along an optical axis from an object side to an image source side, and each of the first lens to the ninth lens includes an object side surface facing the object side and an image side surface facing the image source side. The optical lens module has an aperture on the object side. Among them, the optical lens module is a secondary imaging optical system, the refractive powers of the first lens to the ninth lens are positive, negative, positive, negative, positive, negative, positive, negative, positive, negative, positive, and positive, respectively, and at least one image beam is transmitted in the optical lens module and forms an intermediate image between the aperture and the image source side.

In one embodiment of the present invention, the field of view of the optical lens module is greater than 65 degrees.

In one embodiment of the present invention, the imaging position of the intermediate image is located within the range of the third lens and the fourth lens.

In an embodiment of the present invention, at least one of the first to ninth lenses is an aspherical lens.

In an embodiment of the present invention, the first lens to the ninth lens are all plastic lenses, or the first lens to the ninth lens are a combination of a plastic lens and a glass lens.

In one embodiment of the present invention, the equivalent focal length of the optical lens module is a negative value.

In one embodiment of the present invention, the aperture value of the optical lens module is a negative value.

In order to achieve one or part or all of the above purposes or other purposes, the present invention further provides an optical machine module, including at least one display element and an optical lens module. The at least one display element is used to provide at least one image beam. The optical lens module is configured on the transmission path of at least one image beam. The optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along the optical axis from the object side to the image source side. At least one display element is disposed on the image source side of the optical lens module, and the first lens to the ninth lens each include an object side surface facing the object side and an image side surface facing the image source side. The optical lens module has an aperture on the object side. The optical lens module is a secondary imaging optical system. The refractive powers of the first lens to the ninth lens are positive, negative, positive, negative, positive, negative, positive, negative, positive, negative, positive, and positive, respectively, and at least one image beam is transmitted through the optical lens module and forms an intermediate image between the aperture and at least one display element.

In an embodiment of the present invention, the optical machine module further includes a light combining element disposed between the optical lens module and at least one display element, and the number of the at least one display element is plural.

In an embodiment of the present invention, the optical-mechanical module further includes a light-transmitting prism disposed between the optical lens module and at least one display element, and the number of the at least one display element is one.

In one embodiment of the present invention, the at least one display element is a micro-luminescent diode display element, a micro-organic light-emitting diode display element, a liquid crystal display element, a liquid crystal on silicon display element, a digital microscope display element or a laser beam scanner.

In order to achieve one or part or all of the above purposes or other purposes, the present invention further provides a head-mounted display device, including a waveguide, a coupling element, a coupling element and an optical module. The waveguide has a first side and a second side relative to each other. The coupling element and the coupling element are arranged on the waveguide. The coupling element is located on the first side or the second side. The optical module is arranged on the first side of the waveguide and corresponds to the coupling element. The optical module includes at least one display element and an optical lens module. At least one display element is used to provide at least one image beam. The optical lens module is arranged on the transmission path of at least one image beam. The optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens in sequence along the optical axis from the object side to the image source side. At least one display element is disposed on the image source side of the optical lens module, and each of the first lens to the ninth lens includes an object side surface facing the object side and an image side surface facing the image source side. The optical lens module has an aperture on the object side. The optical lens module is a secondary imaging optical system. The refractive indexes of the first lens to the ninth lens are respectively positive, negative, positive, negative, positive, negative, positive, negative, positive, negative, and positive, and at least one image beam is transmitted through the optical lens module and forms an intermediate image between the aperture and at least one display element. The optical lens module transmits at least one image beam to the waveguide. At least one image beam is transmitted in the waveguide through the coupling element. At least one image beam leaves the waveguide through the coupling element.

In one embodiment of the present invention, the field of view of the optical lens module is greater than 65 degrees.

In one embodiment of the present invention, the aperture of the optical lens module is located on the coupling element.

In an embodiment of the present invention, at least one of the first to ninth lenses is an aspherical lens.

In an embodiment of the present invention, the first lens to the ninth lens are all plastic lenses, or the first lens to the ninth lens are a combination of a plastic lens and a glass lens.

In one embodiment of the present invention, the equivalent focal length of the optical lens module is a negative value.

In one embodiment of the present invention, the aperture value of the optical lens module is a negative value.

In an embodiment of the present invention, the imaging position of the intermediate image is located within the range of the third lens and the fourth lens.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the optical lens module, optical machine module and head-mounted display device of the present invention, the optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along the optical axis from the object side to the image source side, and the refractive indexes of the first lens to the ninth lens are positive, negative, positive, negative, positive, negative, positive, negative, positive, negative and positive, respectively. Therefore, the image beam provided by the display element is transmitted in the optical lens module and forms an intermediate image between the aperture and at least one display element. In this way, the size of the optical lens module can be reduced while having a large field of view and a large aperture.

In order to make the above features and advantages of the present invention more clearly understood, embodiments are specifically cited below and described in detail with reference to the accompanying drawings.

The above-mentioned other technical contents, features and effects of the present invention will be clearly presented in the detailed description of the preferred embodiment with reference to the following drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the present invention.

FIG1 is a schematic diagram of a head-mounted display device of an embodiment of the present invention. Please refer to FIG1. This embodiment provides a head-mounted display device 200 that applies augmented reality (AR) or virtual reality (VR) display technology to provide an image to a human eye E so that the human eye E can see a virtual image through the head-mounted display device 200. The head-mounted display device 200 includes a waveguide 210, an in-coupling element 220, an out-coupling element 230, and an optical module 100.

The waveguide 210 has a first side B1 and a second side B2, wherein the first side B1 is defined as a side close to the human eye E, and the second side B2 is defined as a side away from the human eye E. The waveguide 210 is, for example, a plate-shaped substrate made of a transparent material (e.g., glass), but the present invention is not limited to its type and shape. The coupling-in element 220 is disposed on the first side B1 or the second side B2 of the waveguide 210, and the coupling-out element 230 is disposed on the first side B1 of the waveguide 210 or inside the waveguide 210. For example, in the present embodiment, the coupling-in element 220 is disposed on the first side B1 of the waveguide 210, and the coupling-in element 220 and the coupling-out element 230 are located on the same side of the waveguide 210. In this embodiment, the coupling-in element 220 is, for example, a reflective mirror, a prism, an embossed grating, or a holographic grating, and the coupling-out element 230 is, for example, an array of semi-transmissive and semi-reflective mirrors, an embossed grating, or a holographic grating, but the present invention is not limited thereto.

The optical-mechanical module 100 is disposed at the first side B1 of the waveguide 210 and corresponds to the coupling-in element 220. The optical-mechanical module 100 provides an image beam L to the coupling-in element 220. The image beam L is guided by the coupling-in element 220 to enter the interior of the waveguide 210 for total reflection transmission. The image beam L transmitted in the waveguide 210 is transmitted to the coupling-out element 230 and guided by the coupling-out element 230 to leave the waveguide 210 from the first side B1 of the waveguide 210, and then transmitted to the human eye E. That is, the image beam L is sequentially transmitted from the optical-mechanical module 100 to the coupling-in element 220 and the coupling-out element 230. It is worth mentioning that in the present embodiment, the field of view of the optical-mechanical module 100 is greater than 65 degrees, and the optical-mechanical module 100 is a secondary imaging optical system.

FIG2 is a schematic diagram of an optical machine module of an embodiment of the present invention. Please refer to FIG2. In detail, in the present embodiment, the optical machine module 100 includes at least one display element 30 (shown as a light emitting surface 99 in FIG2) and an optical lens module 10. The at least one display element 30 is used to provide at least one image light beam L containing display content. For example, in the present embodiment, three display elements 30 (for the convenience of explanation, only one is shown in FIG2) can be used to provide red, blue, and green image light beams L, respectively, but the present invention is not limited thereto. In different embodiments, a single display element 30 can be used to provide an image light beam L containing red, blue, and green colors, and simplify the optical elements (such as a spectroscope) in the optical machine module 100. In the present embodiment, the display element 30 may be a self-luminous display panel, such as an organic light-emitting diode display panel (Organic Light-Emitting Diode display, LED display), a micro organic light-emitting diode display panel (Micro Organic Light-Emitting Diode display, LED display) or a micro light-emitting diode display panel (Micro Light-Emitting Diode display, Micro LED display). In addition, a display device that requires an additional external lighting source may also be used, such as a transmissive liquid crystal display panel (Liquid-Crystal Display, LCD), a reflective liquid crystal on silicon panel (Liquid Crystal On Silicon panel, LCoS panel), a digital micro-mirror device (Digital Micro-mirror Device, DMD) or a laser beam scanning (Laser Beam Scanning, LBS), but the present invention is not limited thereto.

The optical machine module 100 further includes a light combining element 20, which is disposed between the optical lens module 10 and the display element 30, and the number of the display elements 30 is plural, wherein in the present embodiment, the number of the display elements 30 is, for example, three, and the light combining element 20 is, for example, an X cube or an X plate, for guiding image beams of different colors from different display elements to the optical lens module 100. However, in other embodiments, the light combining element 20 may be configured between the optical lens module 10 and the display element 30 using a light-transmitting prism (not shown) to be applied to the structure of a single display element 30, and the present invention is not limited thereto. In addition, in this embodiment, a protective cover 40 may be disposed between the light emitting surface 99 of the display element 30 and the light combining element 20 to cover the light emitting surface of the display element 30 to prevent dust from entering.

The optical lens module 10 is disposed on the transmission path of the image beam L to receive at least one image beam L from the image source side A2, wherein the display element 30 is located on the image source side A2 of the optical lens module 10. The optical lens module 10 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9 arranged in sequence along an optical axis I from the object side A1 to the image source side A2, and the optical lens module 10 has an aperture O on the object side A1. The image beam L is transmitted through the optical lens module 10 and forms an intermediate image IM between the aperture O and the image source side A1. Specifically, in this embodiment, the intermediate image IM is located within the range of the third lens 3 and the fourth lens 4. Please refer to FIG. 1 and FIG. 2. When the image beam L emitted by the display element 30 enters the optical lens module 10, and passes through the ninth lens 9, the eighth lens 8, the seventh lens 7, the sixth lens 6, the fifth lens 5, the fourth lens 4, the third lens 3, the second lens 2, the first lens 1, and the aperture 0, it is transmitted through the coupling element 220 into the waveguide 210, and finally forms a virtual image. Among them, in this embodiment, the position of the aperture 0 is located on the coupling element 220.

In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 of the optical lens module 10 and the light combining element 20 and the protective cover 40 of the optical machine module 100 each have an object side surface 15, 25, 35, 45, 55, 65, 75, 85, 95, 105, 115 facing the object side A1 and allowing the image beam L to pass through, and an image side surface 16, 26, 36, 46, 56, 66, 76, 86, 96, 106, 116 facing the image source side A2 and allowing the image beam L to pass through.

The first lens 1 has a positive refractive power. The object side surface 15 of the first lens 1 is a convex surface facing the object side A1, and the image side surface 16 of the first lens 1 is a convex surface facing the image source side A2. In this embodiment, the object side surface 15 and the image side surface 16 of the first lens 1 are both aspheric surfaces, but the present invention is not limited thereto.

The second lens 2 has a negative refractive power. The object side surface 25 of the second lens 2 is a convex surface facing the object side A1, and the image side surface 26 of the second lens 2 is a concave surface facing the image source side A2. In this embodiment, the object side surface 25 and the image side surface 26 of the second lens 2 are both aspherical surfaces, but the present invention is not limited thereto.

The third lens 3 has a positive refractive power. The object-side surface 35 of the third lens 3 is a convex surface facing the object side A1, and the image-side surface 36 of the third lens 3 is a convex surface facing the image source side A2. In this embodiment, the object-side surface 35 and the image-side surface 36 of the third lens 3 are both aspherical surfaces, but the present invention is not limited thereto.

The fourth lens 4 has a negative refractive power. The object side surface 45 of the fourth lens 4 is a convex surface facing the object side A1, and the image side surface 46 of the fourth lens 4 is a concave surface facing the image source side A2. In this embodiment, the object side surface 45 and the image side surface 46 of the fourth lens 4 are both aspherical surfaces, but the present invention is not limited thereto.

The fifth lens 5 has a positive refractive power. The object-side surface 55 of the fifth lens 5 is a convex surface facing the object side A1, and the image-side surface 56 of the fifth lens 5 is a convex surface facing the image source side A2. In this embodiment, the object-side surface 55 and the image-side surface 56 of the fifth lens 5 are both aspherical surfaces, but the present invention is not limited thereto.

The sixth lens 6 has a negative refractive power. The object side surface 65 of the sixth lens 6 is a concave surface facing the object side A1, and the image side surface 66 of the sixth lens 6 is a convex surface facing the image source side A2. In this embodiment, the object side surface 65 and the image side surface 66 of the sixth lens 6 are both aspherical surfaces, but the present invention is not limited thereto.

The seventh lens 7 has a positive refractive power. The object-side surface 75 of the seventh lens 7 is a convex surface facing the object side A1, and the image-side surface 76 of the seventh lens 7 is a convex surface facing the image source side A2. In this embodiment, the object-side surface 75 and the image-side surface 76 of the seventh lens 7 are both aspherical surfaces, but the present invention is not limited thereto.

The eighth lens 8 has a negative refractive power. The object side surface 85 of the eighth lens 8 is a concave surface facing the object side A1, and the image side surface 86 of the eighth lens 8 is a concave surface facing the image source side A2. In this embodiment, the object side surface 85 and the image side surface 86 of the eighth lens 8 are both aspherical surfaces, but the present invention is not limited thereto.

The ninth lens 9 has a positive refractive power. The object side surface 95 of the ninth lens 9 is a convex surface facing the object side A1, and the image side surface 96 of the ninth lens 9 is a convex surface facing the image source side A2. In this embodiment, the object side surface 95 and the image side surface 96 of the ninth lens 9 are both aspherical surfaces, but the present invention is not limited thereto.

In this embodiment, the optical lens module 10 has only the above nine lenses, and the first lens 1 to the ninth lens 9 are all plastic lenses. In addition, in this embodiment, the total length of the optical machine module 100 is 25.0 mm, the field of view of the optical lens module 10 is greater than 65 degrees, and the optimal field of view is 70 degrees, the aperture value (F/#) is -1.6, and the equivalent focal length is a negative value. It should be noted that the aperture value and the equivalent focal length are negative values due to the direction definition. In addition, in this embodiment, the waveguide 210 of FIG. 1 is designed to expand the orbital range (the range in which the human eye E can still clearly see the virtual image when moving around the center point of the system after wearing the head-mounted display device 200) to more than 10 mm, and the diameter of the aperture O of the optical lens module 10 is 1.47 mm, which can effectively reduce the thickness of the optical waveguide. Other detailed optical data are shown in Table 1. In other embodiments, the first lens 1 to the ninth lens 9 can be a combination of plastic lenses and glass lenses, that is, some of the nine lenses are plastic lenses, and the other part is glass lenses.

Table I element surface Curvature radius (mm) Thickness(mm) Refractive Index Abbe number Aperture 0 Infinity 1.50 First lens 1 Object side surface 15 27.02 1.82 1.71300 53.87 Image side surface 16 -1.89 0.10 Second lens 2 Object side surface 25 9.62 0.75 1.84666 23.78 Image side surface 26 2.34 0.46 Third lens 3 Object side surface 35 23.24 1.74 1.71291 53.87 Image side surface 36 -2.18 0.10 Fourth lens 4 Object side surface 45 1.73 1.30 1.74071 49.67 Image side surface 46 0.71 0.70 Fifth lens 5 Object side surface 55 3.00 1.41 1.84666 23.78 Image side surface 56 -8.60 1.34 Sixth lens 6 Object side surface 65 -0.75 0.83 1.52485 64.44 Image side surface 66 -1.90 0.10 Seventh lens 7 Object side surface 75 2.19 1.64 1.74325 49.32 Image side surface 76 -2.64 0.29 Eighth lens 8 Object side surface 85 -2.88 0.75 1.82784 24.47 Image side surface 86 3.09 0.24 Ninth lens 9 Object side surface 95 6.58 1.92 1.71291 53.87 Image side surface 96 -2.26 1.00 Light combining element 20 Object side surface 105 Infinity 5.00 1.51680 64.17 Image side surface 106 Infinity 0.69 Protective cover 40 Object side surface 115 Infinity 0.30 1.50847 61.19 Image side surface 116 Infinity 0.01 Display element 30 Light emitting surface 99 Infinity 0.00

Therefore, through the above configuration, the optical machine module 100 of the present embodiment can be formed into a secondary imaging optical structure, and an intermediate image IM is formed between the aperture 0 and the display element 30. In detail, the display element 30 provides an image beam L, and sequentially transmits through the protective cover 40, the light combining element 20, the ninth lens 9, the eighth lens 8, the seventh lens 7, the sixth lens 6, the fifth lens 5, the fourth lens 4, the third lens 3, the second lens 2, the first lens 1 and the aperture 0. In this way, a small volume, a small effective optical diameter, a large aperture, a large field of view and a good optical effect can be provided.

In addition, in this embodiment, the object side surfaces 15, 25, 35, 45, 55, 65, 75, 85, 95 and the image side surfaces 16, 26, 36, 46, 56, 66, 76, 86, 96 of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the ninth lens 9, a total of eighteen surfaces, are aspherical surfaces, wherein the object side surfaces 15, 25, 35, 45, 55, 65, 75, 85, 95 and the image side surfaces 16, 26, 36, 46, 56, 66, 76, 86, 96 are general aspherical surfaces. These aspherical surfaces are defined according to the following formula (1): (1) Where: Z is the offset (sag) in the direction of optical axis I; r is the radius of curvature close to optical axis I; k is the conic constant; c is the aspheric height, which is the height from the center of the lens to the edge of the lens; A~F are the aspheric coefficients.

The aspheric coefficients of the object side surface 15 of the first lens 1 to the image side surface 96 of the ninth lens 9 in formula (1) are shown in Table 2. In Table 2, the column number 15 indicates that it is the aspheric coefficient of the object side surface 15 of the first lens 1, and the other columns are similar. In this embodiment and the following embodiments, the second-order aspheric coefficient is 0.

Table II surface K A B 15 7.72062 1.6473E-03 4.8139E-04 16 -1.62101 4.7462E-03 2.6299E-04 25 5.30696 2.9776E-03 -5.9594E-04 26 -3.71242 2.1509E-03 -4.2761E-04 35 -9.25027 1.0917E-02 5.3627E-04 36 -1.30083 9.0382E-03 2.6987E-03 45 -0.89624 -3.0659E-02 3.2865E-03 46 -2.01043 -1.9643E-02 4.3787E-03 55 -3.53455 2.4661E-02 -3.1991E-03 56 -9.80852 1.6244E-02 5.9849E-06 65 -2.23058 -2.8237E-02 7.1570E-03 66 -3.00241 -1.1380E-02 4.9267E-03 75 -7.33855 3.2260E-04 1.6734E-03 76 -4.86720 6.3369E-04 1.2424E-03 85 -2.83145 4.6433E-04 -6.7774E-04 86 -9.99895 -2.4130E-03 1.3828E-04 95 -6.61671 2.1917E-04 -1.4409E-04 96 -1.98742 -3.4757E-03 -2.7737E-05

Referring to Figures 3 to 6, Figures 3 and 4 are Modulation Transfer Function (MTF) curves of different representations of the optical module of Figure 2 on the imaging surface of the display element. Figure 5 is a diagram of the longitudinal spherical aberration and various aberrations of the optical module of Figure 2. Figure 6 is a beam fan diagram of the optical module of Figure 2. Among them, Figures 3 and 4 illustrate that the optical lens module 10 of this embodiment has good optical effects. Figure 5 illustrates the longitudinal spherical aberration (longitudinal spherical aberration) diagram, astigmatic field curvature (astigmatic field curvature) diagram and distortion (distortion) diagram of the optical lens module 10 of this embodiment. It can be seen from the figure that the error is small, so it has a good optical effect. FIG. 6 illustrates a ray fan plot of the optical lens module 10 of the present embodiment. The displayed figures are all within the standard range, thereby verifying that the optical lens module 10 of the present embodiment can achieve good optical imaging quality.

In summary, in the optical lens module, optical machine module and head-mounted display device of the present invention, the optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along the optical axis from the object side to the image source side, and the refractive powers of the first lens to the ninth lens are positive, negative, positive, negative, positive, negative, positive, negative, positive, negative and positive, respectively. Therefore, the image beam provided by the display element is transmitted through the optical lens module and forms an intermediate image between the aperture and at least one display element. In this way, the volume of the optical lens module can be reduced, and at the same time, a large field of view and a large aperture are provided.

However, the above is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description are still within the scope of the present invention. In addition, any embodiment or patent application of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title are only used to assist in searching for patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or patent application are only used to name the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

0: aperture 1: first lens 2: second lens 3: third lens 4: fourth lens 5: fifth lens 6: sixth lens 7: seventh lens 8: eighth lens 9: fifth lens 10: optical lens module 15,25,35,45,55,65,75,85,95,105,115: object side surface 16,26,36,46,56,66,76,86,96,106,116: image side surface 20: light combining element 30: display element 40: protective cover 99: light emitting surface 100: optical machine module 200: head mounted display device 210: waveguide 220: coupling element 230: coupling element A1: object side A2: image source side B1: first side B2: second side E: human eye I: optical axis IM: intermediate image L: image beam

FIG1 is a schematic diagram of a head-mounted display device of an embodiment of the present invention. FIG2 is a schematic diagram of an optical module of an embodiment of the present invention. FIG3 and FIG4 are respectively modulation transfer function curves of different representations of the optical module of FIG2 on the imaging surface of the display element. FIG5 is a longitudinal spherical aberration and various aberration diagrams of the optical module of FIG2. FIG6 is a beam fan diagram of the optical module of FIG2.

0: aperture 1: first lens 2: second lens 3: third lens 4: fourth lens 5: fifth lens 6: sixth lens 7: seventh lens 8: eighth lens 9: fifth lens 10: optical lens module 15,25,35,45,55,65,75,85,95,105,115: object side surface 16,26,36,46,56,66,76,86,96,106,116: image side surface 20: light combining element 30: display element 40: protective cover 99: light emitting surface 100: optical machine module A1: object side A2: image source side I: optical axis IM: intermediate image L: image beam

Claims (19)

An optical lens module is used to receive at least one image beam from an image source side, the optical lens module comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along an optical axis from an object side to the image source side, and the first lens to the ninth lens each include an object side surface facing the object side and an image side surface facing the image source side, the optical lens module has an aperture on the object side; The optical lens module is a secondary imaging optical system, the refractive indexes of the first lens to the ninth lens are respectively positive, negative, positive, negative, positive, negative, positive, negative, positive, negative, positive, and positive, and the at least one image beam is transmitted through the optical lens module and forms an intermediate image between the aperture and the image source side. An optical lens module as described in claim 1, wherein the field of view of the optical lens module is greater than 65 degrees. An optical lens module as described in claim 1, wherein the imaging position of the intermediate image is located within the range of the third lens and the fourth lens. An optical lens module as described in claim 1, wherein at least one of the first lens to the ninth lens is an aspherical lens. An optical lens module as described in claim 1, wherein the first lens to the ninth lens are all plastic lenses, or the first lens to the ninth lens are a combination of plastic lenses and glass lenses. An optical lens module as described in claim 1, wherein the equivalent focal length of the optical lens module is a negative value. An optical lens module as described in claim 1, wherein the aperture value of the optical lens module is a negative value. An optical machine module, comprising: At least one display element, for providing at least one image beam; and An optical lens module, arranged on the transmission path of the at least one image beam, the optical lens module comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along the optical axis from the object side to the image source side, the at least one display element is arranged on the image source side of the optical lens module, and the first lens to the ninth lens each include an object side surface facing the object side and an image side surface facing the image source side, and the optical lens module has an aperture on the object side; The optical lens module is a secondary imaging optical system, the refractive indexes of the first lens to the ninth lens are respectively positive, negative, positive, negative, positive, negative, positive, negative, positive, negative, positive, and positive, and the at least one image beam is transmitted through the optical lens module and forms an intermediate image between the aperture and the at least one display element. The optical machine module as described in claim 8 further includes a light combining element, which is arranged between the optical lens module and the at least one display element, and the number of the at least one display element is plural. The optical-mechanical module as described in claim 8 further includes a light-transmitting prism disposed between the optical lens module and the at least one display element, and the number of the at least one display element is one. An optical-mechanical module as described in claim 8, wherein the at least one display element is a micro-luminescent diode display element, a micro-organic light-emitting diode display element, an organic light-emitting diode display element, a liquid crystal display element, a silicon-based liquid crystal display element, a digital micromirror display element or a laser beam scanner. A head-mounted display device comprises: a waveguide, an in-coupling element, an out-coupling element and an optical module, wherein the waveguide has a first side and a second side relative to each other; the in-coupling element and the out-coupling element are arranged on the waveguide, and the in-coupling element is located on the first side or the second side; the optical module is arranged on the first side of the waveguide and corresponds to the in-coupling element, and the optical module comprises: at least one display element for providing at least one image beam; and An optical lens module is arranged on the transmission path of the at least one image beam. The optical lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens in sequence along the optical axis from the object side to the image source side. The at least one display element is arranged on the image source side of the optical lens module, and the first lens to the ninth lens each include an object side surface facing the object side and an image side surface facing the image source side. The optical lens module has an aperture on the object side; The optical lens module is a secondary imaging optical system, the refractive indexes of the first lens to the ninth lens are respectively positive, negative, positive, negative, positive, negative, positive, negative, positive, negative, positive, and positive, and the at least one image beam is transmitted through the optical lens module and forms an intermediate image between the aperture and the at least one display element. The optical lens module transmits the at least one image beam to the waveguide, the at least one image beam is transmitted in the waveguide through the coupling element, and the at least one image beam leaves the waveguide through the coupling element. A head-mounted display device as described in claim 12, wherein the field of view of the optical lens module is greater than 65 degrees. A head-mounted display device as described in claim 12, wherein the aperture of the optical lens module is located on the coupling element. A head-mounted display device as described in claim 12, wherein at least one of the first lens to the ninth lens is an aspherical lens. A head-mounted display device as described in claim 12, wherein the first lens to the ninth lens are all plastic lenses, or the first lens to the ninth lens are a combination of plastic lenses and glass lenses. A head-mounted display device as described in claim 12, wherein the equivalent focal length of the optical lens module is a negative value. A head-mounted display device as described in claim 12, wherein the aperture value of the optical lens module is a negative value. A head-mounted display device as described in claim 12, wherein the imaging position of the intermediate image is located within the range of the third lens and the fourth lens.

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