TW202422147A - Optical lens module, optical engine module and head mounted display - Google Patents

Abstract

An optical lens module configured to receive at least one image light beam from an image source side is provided. The optical lens module includes a plurality of lens elements. The plurality of lens elements includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along an optical axis from an object side to the image source side, and the plurality of lens elements have a half mirror layer, a phase retardation layer and a polarization reflection layer respectively formed on the surfaces of the plurality of lens elements. The optical lens module has an aperture on the object side. Wherein, the optical lens module is a secondary imaging optical system, and the at least one image light beam is transmitted through the optical lens module to 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.

Head-mounted display (HMD) is a product with great development potential. It is a head-mounted display with augmented reality (AR) technology and virtual reality (VR) technology. It uses an optical module to project image beams onto a waveguide to provide users with a virtual reality image experience.

However, the field of view of the optical lens module of the existing head-mounted display device does not exceed 35 degrees. If the field of view is to be increased, the size of the optical lens module will inevitably increase. In addition, if the optical efficiency is to be improved to increase the brightness, the aperture of the optical lens module needs to be increased in the optical design, which will also cause the size of the optical lens module to increase. Therefore, how to develop an optical lens module with a large field of view, a small size and a 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, 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.

In order 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 the image source side. The optical lens module includes a plurality of lenses. The plurality of lenses include a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis from the object side to the image source side, and the plurality of lenses have a semi-reflective layer, a phase delay layer and a polarized reflective layer, which are respectively formed on the surfaces of the plurality of lenses. The optical lens module has an aperture on the object side. The optical lens module is a secondary imaging optical system, 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 first to fifth lenses each include an object side surface facing the object side and an image side surface facing the image source side. A polarized reflection layer is disposed on the image side surface of the first lens, a semi-reflection layer is disposed on the image side surface of the second lens, and a phase delay layer is disposed on the object side surface of the second lens.

In an embodiment of the present invention, the refractive powers of the first lens to the fifth lens are negative, negative, positive, negative, and positive, respectively.

In an embodiment of the present invention, the at least one image light beam transmitted to the lens is circularly polarized light.

In one embodiment of the present invention, the phase retardation layer is a quarter-wave phase retardation plate.

In one embodiment of the present invention, at least one of the above-mentioned lenses is an aspherical 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 at least one image beam from the image source side is sequentially transmitted to the semi-reflective layer, the phase delay layer, the polarized reflective layer, the phase delay layer, the semi-reflective layer, the phase delay layer and the polarized reflective layer.

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

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 the at least one image beam. The optical lens module includes a plurality of lenses, and the lenses include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence along the optical axis from the object side to the image source side, and the lens has a semi-reflective layer, a phase delay layer, and a polarized reflective layer, which are respectively formed on the surface of the lens, and the optical lens module has an aperture on the object side. The optical lens module is a secondary imaging optical system, 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 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, wherein the waveguide has a first side and a second side opposite to each other. The coupling element is configured on the first side or the second side. The coupling element is configured on the first side. The optical module is configured on the first side 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 configured on the transmission path of at least one image beam, and the optical lens module includes a plurality of lenses, and the optical lens module has a semi-reflective layer, a phase delay layer and a polarized reflection layer, which are respectively formed on the surface of the lens. Among them, at least one image beam is sequentially transmitted from the optical machine module to the coupling element and the coupling element. The optical machine module is a secondary imaging optical system, and at least one image beam is transmitted in the optical lens module and forms an intermediate image between the aperture and at least one display element.

In one embodiment of the present invention, the first to fifth lenses mentioned above each include an object side surface facing the object side and an image side surface facing the image side, wherein a polarized reflection layer is disposed on the image side surface of the first lens, a semi-reflection layer is disposed on the image side surface semi-reflection layer of the second lens, and a phase retardation layer is disposed on the object side surface phase retardation layer of the second lens.

In an embodiment of the present invention, the refractive powers of the first lens to the fifth lens are negative, negative, positive, negative, and positive, respectively.

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

In an embodiment of the present invention, the at least one image light beam transmitted to the lens is circularly polarized light.

In one embodiment of the present invention, the phase retardation layer is a quarter-wave phase retardation plate.

In one embodiment of the present invention, at least one of the above-mentioned lenses is an aspherical 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 at least one image beam from at least one display element is sequentially transmitted to the semi-reflective layer, the phase retardation layer, the polarized reflective layer, the phase retardation layer, the semi-reflective layer, the phase retardation layer, and the polarized reflective layer.

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, multiple lenses include a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis from the object side to the image source side, and the multiple lenses have a semi-reflective layer, a phase delay layer and a polarized reflective layer, which are respectively formed on the surfaces of the multiple lenses. Therefore, the image light beam provided by the display element can achieve the effect of folding the light path through the semi-reflective layer, the phase delay layer and the polarized reflective layer. In this way, the volume of the optical lens module can be reduced, and at the same time have 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 for providing an image beam L to a human eye E. After the image beam L leaves the head-mounted display device 200, a virtual image is formed at a certain distance, and the virtual image is imaged on the human eye E. The head-mounted display device 200 can be applied to the display technology of augmented reality (AR) or virtual reality (VR). The head-mounted display device 200 includes a waveguide 210, a coupling element 220, a coupling element 230, and an optical machine module 100.

The waveguide 210 has a first side B1 and a second side B2 opposite to each other, 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 far from the human eye E. The waveguide 210 is, for example, a plate-shaped substrate made of a light-transmitting material (e.g., glass). 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. For example, in the present embodiment, the coupling-in element 220 is disposed on the first side B1 of the waveguide 210, that is, 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.

The optical machine module 100 is disposed on the first side B1 of the waveguide 210 and corresponds to the coupling-in element 220. The optical machine module 100 provides an image beam L to the coupling-in element 220. After passing through the coupling-in element 220, the image beam L is guided to the inside of the waveguide 210 and transmitted in the form of total reflection. After the image beam L transmitted in the waveguide 210 is transmitted to the coupling-out element 230, it is transmitted to the human eye E. That is, the image beam L is transmitted from the optical machine module 100 to the coupling-in element 220 and the coupling-out element 230 in sequence. It is worth mentioning that in the present embodiment, the field of view of the optical machine module 100 is greater than 65 degrees, and the optical machine 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 and an optical lens module 10. The at least one display element 30 includes a light emitting surface 99. 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, the optical machine module 100 may include three display elements 30 (for the convenience of explanation, only one is shown in FIG2 ) for providing red, blue and green image light beams L, respectively. The technical effect of this embodiment is that the optical machine module 100 can provide an image light beam L with a higher brightness. In different embodiments, the optical machine module 100 may include only one display element 30 for providing an image light beam L containing at least one of red, blue and green. The technical effect of this embodiment is that the optical elements in the optical machine module 100 can be simplified, for example, a spectroscope is not required. In this embodiment, the display element 30 can be a self-luminous display panel, such as a light-emitting diode display panel (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 external lighting source can 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 scanner (Laser Beam Scanning, LBS), but the present invention is not limited thereto.

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. It is worth mentioning that at least one image beam L transmitted to the multiple lenses is circularly polarized light. In one embodiment, the optical machine module 100 may include a polarizer (not shown) to form circularly polarized light. The optical lens module 10 includes a plurality of lenses, and the optical lens module 10 has a semi-reflective layer S1, a phase delay layer S2, and a polarized reflective layer S3, which are respectively formed on the surfaces of the plurality of lenses.

In the present embodiment, 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, wherein the display element 30 is located on the image source side A2 of the optical lens module 10. In the embodiment in which the number of display elements 30 is plural, the light combining element 20 may be, for example, an X cube, an X plate, or a spectroscope. However, in the embodiment in which the number of display elements 30 is one, the light combining element 20 may be, for example, a light-transmitting prism (not shown). In addition, in the present embodiment, the optical machine module 100 further includes a protective cover 40, which is disposed between the light emitting surface 99 of the display element 30 and the light combining element 20, so as to cover the light emitting surface 99 of the display element 30 to prevent dust from entering.

The above-mentioned multiple lenses include a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 arranged in sequence along the 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 optical lens module 10 is a secondary imaging optical system. 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 A2. Specifically, in this embodiment, the intermediate image IM is located within the range of the first lens 1 and the second lens 2. Please refer to Figures 1 and 2. When the image beam L emitted by the display element 30 enters the optical lens module 10 and passes through 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 and enters the waveguide 210 to finally form a virtual image. Among them, 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 of the optical lens module 10, the light combining element 20 of the optical machine module 100, and the protective cover 40 each have an object side surface 15, 25, 35, 45, 55, 65, 75 facing the object side A1 and an image side surface 16, 26, 36, 46, 56, 66, 76 facing the image source side A2. In this embodiment, at least one of the multiple lenses of the optical lens module 10 is an aspherical lens. The first lens 1 to the fifth lens 5 can be a combination of a plastic lens and a glass lens.

The first lens 1 has a negative refractive power. Viewed in the direction toward the image source side A2, the object side surface 15 of the first lens 1 is, for example, a concave surface, and the image side surface 16 of the first lens 1 is, for example, a convex surface. In the present embodiment, the object side surface 15 and the image side surface 16 of the first lens 1 are, for example, both aspheric surfaces. The polarized reflection layer S3 is disposed on the image side surface 16 of the first lens 1, and the polarized reflection layer S3 is used to reflect the first linear polarized light (for example, P polarized light or S polarized light) and allow the second linear polarized light (for example, S polarized light or P polarized light) to pass through. The polarized reflection layer S3 is, for example, a polarized reflector.

The second lens 2 has a negative refractive power. Viewed in the direction toward the image source side A2, the object side surface 25 of the second lens 2 is, for example, a concave surface, and the image side surface 26 of the second lens 2 is, for example, a convex surface. In the present embodiment, the object side surface 25 and the image side surface 26 of the second lens 2 are, for example, both aspherical surfaces. Among them, the semi-reflective layer S1 is disposed on the image side surface 26 of the second lens 2, and the phase delay layer S2 is disposed on the object side surface 25 of the second lens 2. In the present embodiment, the semi-reflective layer S1 is, for example, used to allow the first circularly polarized light (for example, right-handed polarized light or left-handed polarized light) to pass through and reflect the second circularly polarized light (for example, left-handed polarized light or right-handed polarized light). The semi-reflective layer S1 is, for example, a semi-reflective mirror. The phase retardation layer S2 is, for example, a quarter-wave phase retardation plate, which is used to convert the polarization state of the image light beam L, for example, converting the first (second) linear polarized light into the second (first) linear polarized light.

The third lens 3 has a positive refractive power. When viewed along the direction toward the image source side A2, the object-side surface 35 of the third lens 3 is, for example, a convex surface, and the image-side surface 36 of the third lens 3 is, for example, a convex surface. In this embodiment, the object-side surface 35 and the image-side surface 36 of the third lens 3 are, for example, both aspherical surfaces.

The fourth lens 4 has a negative refractive power. When viewed from the direction toward the image source side A2, the object side surface 45 of the fourth lens 4 is, for example, a concave surface, and the image side surface 46 of the fourth lens 4 is, for example, a concave surface. In this embodiment, the object side surface 45 and the image side surface 46 of the fourth lens 4 are, for example, both aspherical surfaces.

The fifth lens 5 has a positive refractive power. When viewed along the direction toward the image source side A2, the object-side surface 55 of the fifth lens 5 is, for example, a convex surface, and the image-side surface 56 of the fifth lens 5 is, for example, a convex surface. In this embodiment, the object-side surface 55 and the image-side surface 56 of the fifth lens 5 are, for example, both aspherical surfaces.

In this embodiment, the multiple lenses of the optical lens module 10 are embodied as five lenses. In addition, in this embodiment, the waveguide 210 of FIG. 1 is designed, for example, 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 millimeters (mm), and the diameter of the aperture O of the optical lens module 10 is, for example, 1.5 millimeters (mm). Since the diameter of the aperture O is small, the diameter of the image light beam L entering the waveguide 210 is small, which can effectively reduce the thickness of the waveguide 210 to achieve the effect of a small volume of the head-mounted display device 200. The total length of the optical machine module 100 is, for example, 16.5 millimeters (mm), and the volume of the optical machine module 100 may be less than 1 cubic centimeter (cm ³ ). 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/#) of the optical lens module 10 is -1.6, and the equivalent focal length is a negative value. It should be noted that, since the optical lens module 10 is an optical structure for secondary imaging, an intermediate image IM can be formed between the aperture 0 and the display element 30. Therefore, the aperture value and the equivalent focal length in this embodiment are negative values due to the direction definition. Other optical data are shown in Table 1 below.

Table I element noodle Curvature radius (mm) Thickness(mm) Refractive Index Abbe number aperture Infinity 1.75 First lens 1 Object side surface 15 -5.37 0.75 1.84666 23.78 First lens 1 Image side surface 16 -5.73 1.46 Second lens 2 Object side surface 25 -2.69 1.00 1.68176 30.37 Second lens 2 Image side surface 26 -3.94 -1.00 1.68176 30.37 Second lens 2 Object side surface 25 -2.69 -1.46 First lens 1 Image side surface 16 -5.73 1.46 Second lens 2 Object side surface 25 -2.69 1.00 1.68176 30.37 Second lens 2 Image side surface 26 -3.94 0.10 Third lens 3 Object side surface 35 5.03 1.54 1.71317 53.84 Third lens 3 Image side surface 36 -2.19 0.10 Fourth lens 4 Object side surface 45 -3.38 0.75 1.84647 23.78 Fourth lens 4 Image side surface 46 7.28 0.10 Fifth lens 5 Object side surface 55 4.13 2.04 1.71308 53.85 Fifth lens 5 Image side surface 56 -2.84 0.92 Light combining element 20 Object side surface 65 Infinity 5.00 1.51680 64.17 Image side surface 66 Infinity 0.69 Protective cover 40 Object side surface 75 Infinity 0.30 1.50847 61.19 Image side surface 76 Infinity 0.01 Display element 30 Light emitting surface 99 Infinity 0.00

In detail, the image beam L provided by the display element 30 is a first circularly polarized light (for example, right-handed polarized light or left-handed polarized light), and is sequentially transmitted through the protective cover 40, the light combining element 20, the fifth lens 5, the fourth lens 4, and the third lens 3. When the image beam L from the object side surface 35 of the third lens 3 is transmitted to the semi-reflective layer S1 on the image side surface 26 of the second lens 2, at least a portion of the image beam L will pass through the semi-reflective layer S1. At this time, the image beam L is the first circularly polarized light. The first circularly polarized light continues to be transmitted and passes through the phase delay layer S2 on the object side surface 25 of the second lens. The phase delay layer S2 is used to convert the first circularly polarized light into a first linearly polarized light (for example, P-polarized light or S-polarized light). At this time, the image beam L is a first linear polarized light. When the image beam L of the first linear polarized light from the object side surface 25 of the second lens 2 is transmitted to the polarization reflection layer S3 on the image side surface 16 of the first lens 1, the polarization reflection layer S3 is used to reflect the first linear polarized light and transmit the first linear polarized light toward the object side surface 25 of the second lens 2. When the first linear polarized light from the image side surface 16 of the first lens 1 is transmitted through the phase delay layer S2 on the object side surface 25 of the second lens 2, the phase delay layer S2 is used to convert the first linear polarized light into a first circular polarization. At this time, the image beam L is a first circularly polarized light. When the first circularly polarized light from the object side surface 25 of the second lens 2 is transmitted to the semi-reflective layer S1 on the image side surface 26 of the second lens 2, the first circularly polarized light is reflected to form a second circularly polarized light (for example, left-handed polarized light or right-handed polarized light) and transmitted toward the object side surface 25 of the second lens 2. At this time, the image beam L is the second circularly polarized light.

As described above, the second circularly polarized light from the image side surface 26 of the second lens 2 is transmitted and passes through the phase delay layer S2 on the object side surface 25 of the second lens 2. The phase delay layer S2 is used to convert the second circularly polarized light into a second linearly polarized light (for example, S polarized light or P polarized light). At this time, the image beam L is a second linearly polarized light. Finally, the second linearly polarized light is transmitted from the object side surface 25 of the second lens 2 to the polarization reflection layer S3 on the image side surface 16 of the first lens 1. The polarization reflection layer S3 is used to allow the second linearly polarized light to pass. The second linearly polarized light is transmitted from the image side surface 16 of the first lens 1 to the aperture 0 and enters the waveguide 210. In other words, the image beam L provided by the display element 30 is sequentially transmitted to the semi-reflective layer S1, the phase delay layer S2, the polarized reflective layer S3, the phase delay layer S2, the semi-reflective layer S1, the phase delay layer S2 and the polarized reflective layer S3, so as to achieve the effect of folding the light path. In this way, the volume of the optical lens module 10 can be reduced.

In addition, in this embodiment, the object side surfaces 15, 25, 35, 45, 55 and the image side surfaces 16, 26, 36, 46, 56 of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5, a total of ten surfaces, are aspherical surfaces, wherein the object side surfaces 15, 25, 35, 45, 55 and the image side surfaces 16, 26, 36, 46, 56 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 56 of the fifth lens 5 in formula (1) are shown in Table 2 below. 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 noodle K A B C 15 -0.55832 5.11299E-03 6.92354E-04 0 16 1.07630 7.53931E-03 9.46662E-05 1.51747E-05 25 -0.65477 -6.72407E-03 6.54771E-04 0 26 -0.44757 -1.15806E-03 3.49737E-05 -2.57437E-06 35 -3.43416 5.06513E-03 -3.45648E-04 0 36 -1.11359 4.07164E-04 7.17649E-05 0 45 -0.79901 -3.73703E-03 -5.62306E-03 0 46 7.96382 3.60710E-03 -3.56976E-03 1.67655E-04 55 0 -1.05985E-02 1.97163E-05 -5.80727E-05 56 0 3.15305E-04 3.96757E-04 1.23294E-05

Referring to Figures 3 to 6, Figures 3 and 4 are Modulation Transfer Function (MTF) curves of different representations of the optical lens 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 lens module of Figure 2. Figure 6 is a beam fan diagram of the optical lens module of Figure 2. Among them, the horizontal axis of Figure 3 is the spatial frequency (cycles/mm), and the vertical axis is the modulus of the optical transfer function. In Figure 4, the spatial frequency is 120.0 cycles/mm, the horizontal axis of Figure 4 is the focus shift, and the vertical axis is the modulus of the optical transfer function. In FIG. 3 and FIG. 4 , T represents the curve in the tangential direction, R represents the curve in the sagittal direction, and the value next to “TR” represents the angle, and Diff. Limit represents the diffraction limit. FIG. 3 and FIG. 4 illustrate that the optical lens module 10 of the present embodiment has a good optical effect. FIG. 5 illustrates the longitudinal spherical aberration diagram, astigmatic field curvature diagram, and distortion diagram of the optical lens module 10 of the present 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, a plurality of lenses include a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis from the object side to the image source side, and the plurality of lenses have a semi-reflective layer, a phase retardation layer and a polarized reflective layer, which are respectively formed on the surfaces of the plurality of lenses. Therefore, the image light beam provided by the display element can achieve the effect of folding the light path by being transmitted to the semi-reflective layer, the phase retardation layer and the polarized reflective layer. In this way, the volume of the optical lens module can be reduced, and at the same time have a large field of view and a large aperture.

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 10: optical lens module 15,25,35,45,55,65,75: object side surface 16,26,36,46,56,66,76: image side surface 20: light combining element 30: display element 40: protective cover 99: light output 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 S1: semi-reflective layer S2: phase delay layer S3: polarized reflective layer

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

0: Aperture

1: First lens

2: Second lens

3: Third lens

4: The fourth lens

5: Fifth lens

10: Optical lens module

15,25,35,45,55,65,75: Object side surface

16,26,36,46,56,66,76: Image side surface

20: Light combining element

30: Display component

40: Protective cover

99: Bright surface

100: Optical machine module

A1: Physical side

A2: Image source side

I: Optical axis

IM: intermediate image

L: Image beam

S1: Semi-reflective layer

S2: Phase delay layer

S3: Polarized reflective layer

Claims (25)

An optical lens module is used to receive at least one image beam from an image source side, the optical lens module comprises: A plurality of lenses, including a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along an optical axis from an object side to the image source side, and the plurality of lenses have a half reflection layer, a phase delay layer and a polarization reflection layer, which are respectively formed on the surfaces of the lenses, and the optical lens module has an aperture on the object side; Wherein, the optical lens module is a secondary imaging optical system, and the 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. 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 first lens to the fifth lens each include an object side surface facing the object side and an image side surface facing the image source side, the polarized reflection layer is disposed on the image side surface of the first lens, the semi-reflection layer is disposed on the image side surface of the second lens, and the phase delay layer is disposed on the object side surface of the second lens. An optical lens module as described in claim 1, wherein the refractive powers of the first lens to the fifth lens are negative, negative, positive, negative, and positive, respectively. An optical lens module as described in claim 1, wherein the at least one image light beam transmitted to the lenses is circularly polarized light. An optical lens module as described in claim 1, wherein the phase retardation layer is a quarter-wave phase retardation plate. An optical lens module as described in claim 1, wherein at least one of the lenses is an aspherical lens. 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 lens module as described in claim 1, wherein the at least one image light beam from the image source side is sequentially transmitted to the semi-reflective layer, the phase retardation layer, the polarized reflective layer, the phase retardation layer, the semi-reflective layer, the phase retardation layer and the polarized reflective layer. An optical lens module as described in claim 1, wherein the imaging position of the intermediate image is located within the range of the first lens and the second lens. 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 plurality of lenses, the lenses comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along an optical axis from an object side to the image source side, and the lenses having a semi-reflective layer, a phase delay layer and a polarized reflective layer, respectively formed on the surfaces of the lenses, the optical lens module having an aperture on the object side; The optical lens module is a secondary imaging optical system, 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 12 further includes: A light combining element, disposed between the optical lens module and the at least one display element, the at least one display element being plural in number. The optical machine module as described in claim 12 further comprises: A light-transmitting prism disposed between the optical lens module and the at least one display element, the number of the at least one display element being one. A head-mounted display device comprises: a waveguide having a first side and a second side opposite to each other; a coupling element disposed on the first side or the second side; a coupling-out element disposed on the first side; and an optical machine module disposed on the first side and corresponding to the coupling-in element, the optical machine module comprising: at least one display element for providing at least one image beam; and an optical lens module disposed on the transmission path of the at least one image beam, the optical lens module comprising a plurality of lenses, the optical lens module having a semi-reflective layer, a phase delay layer and a polarized reflective layer, which are respectively formed on the surfaces of the lenses, wherein the at least one image beam is sequentially transmitted from the optical machine module to the coupling-in element and the coupling-out element, The optical machine module is a secondary imaging optical system, 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. A head-mounted display device as described in claim 15, wherein the field of view of the optical lens module is greater than 65 degrees. A head-mounted display device as described in claim 15, wherein the first lens to the fifth lens each include an object side surface facing the object side and an image side surface facing the image side, wherein the polarized reflection layer is disposed on the image side surface of the first lens, the semi-reflection layer is disposed on the image side surface of the second lens, and the phase delay layer is disposed on the object side surface of the second lens. A head-mounted display device as described in claim 15, wherein the refractive powers of the first lens to the fifth lens are negative, negative, positive, negative, and positive, respectively. A head-mounted display device as described in claim 18, wherein the aperture is located on the coupling element. A head-mounted display device as described in claim 15, wherein at least one image light beam transmitted to the lenses is circularly polarized light. A head-mounted display device as described in claim 15, wherein the phase delay layer is a quarter-wave phase delay plate. A head-mounted display device as described in claim 15, wherein at least one of the lenses is an aspherical lens. A head-mounted display device as described in claim 15, wherein the equivalent focal length of the optical lens module is a negative value. A head-mounted display device as described in claim 15, wherein the aperture value of the optical lens module is a negative value. A head-mounted display device as described in claim 15, wherein the at least one image light beam from the at least one display element is sequentially transmitted to the semi-reflective layer, the phase delay layer, the polarized reflective layer, the phase delay layer, the semi-reflective layer, the phase delay layer, and the polarized reflective layer.

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