Optical machine module and augmented reality equipment

Abstract

The invention discloses an optical machine module, and the module comprises an image source device which is used for projecting image light; the lens system is used for receiving the image light rays and diverging the image light rays, and the lens system comprises a focus-adjustable lens module and a lens assembly which are arranged along an optical axis; the focus-adjustable lens module comprises a lens cover and a substrate which are arranged at an interval along an optical axis, and a lens body coupled between the lens cover and the substrate, the lens cover and / or the substrate are / is made of glass, the lens cover is integrated with an actuator, the actuator is used for driving the lens cover to generate surface shape change, and the lens body is coupled between the lens cover and the substrate. The lens body is made of a deformable non-fluid material, and the lens assembly comprises at least one plastic lens; and the control system is coupled with the actuator, so that the sensitivity of the optical machine module to the temperature is lower, and the position of the back focus can be adjusted at the module end. The invention also discloses an augmented reality device related to the optical machine module.

Description

Technical Field

[0001] The present application relates to augmented reality, and more particularly to an optical-mechanical module, and also to an augmented reality device using the aforementioned optical-mechanical module. Background Art

[0002] With the advancement of imaging technology, people's demand for immersive experience is getting higher and higher. In recent years, the development of virtual reality (VR) and augmented reality (AR) technology has gradually satisfied people's pursuit of visual experience. Among them, augmented reality (AR) technology is a technology that cleverly integrates virtual information with the real world. It widely uses a variety of technical means such as multimedia, three-dimensional modeling, real-time tracking and registration, intelligent interaction, and sensing. After simulating computer-generated virtual information such as text, images, three-dimensional models, music, and videos, it is applied to the real world. The two types of information complement each other, thereby achieving "enhancement" of the real world.

[0003] For head-mounted AR devices, near-eye display is the key to its technology. The near-eye display system includes an optical machine module and a light guide component, wherein the optical machine module usually includes an image source device and a projection lens, wherein the image source device is used to output light with a projected image, and the projection lens is used to amplify the light from the image source device and project the light to the light guide component, and the light guide component usually includes a folded optical path to dilate the image light before transmitting it to the human eye.

[0004] When the AR device is in use, the operating temperature of the near-eye display system will change with the seasons (such as cold winter and hot summer), and the image source device will generate a lot of heat during operation. Even if the existing AR device will set a heat dissipation structure to dissipate the heat of the chip, the heat dissipation effect is limited, making it difficult to maintain the operating temperature of the near-eye display system at a constant value. Because the projection lens is closer to the image source device, the ambient temperature of the projection lens is more likely to change. In addition, the projection lens in the prior art usually uses a plastic lens, which has a temperature drift effect. Specifically, the surface shape and refractive index of the plastic lens change due to temperature, causing the focal length and image focal length of the optical machine module to change, affecting the image quality, and even causing defocus. In addition, due to the magnification of the image by the projection lens and the upstream location of the projection lens in the entire optical path of the AR device, the image quality of the AR device is more obviously affected by the temperature drift effect.

[0005] To improve the temperature drift effect of a projection lens, in the prior art, the projection lens is usually improved into a combination of a plastic lens and a glass lens. By utilizing the low temperature sensitivity of the glass lens, the thermal stability of the projection lens is improved. However, the glass lens has the problem of greater design difficulty. Specifically, the design variables of the glass spherical surface are few and the optimization difficulty is great. Moreover, the glass aspheric process is restricted by the reverse curvature and edge thickness, and the optimization degree of freedom is low.

[0006] In addition, for the projection lens of either all-plastic lens or plastic-glass hybrid lens, the optical engine module involves dispensing during assembly. On the one hand, the glue will shrink when baked and dried, which may cause the change of the back focal length and make the image-side focus deviate from the image plane position. On the other hand, there are inevitably tolerances in the dispensing amount, which will also cause the offset amount of the back focal position relative to the image plane position to jitter with different dispensing amounts. These two factors in the assembly process will also affect the imaging quality of the optical engine module.

[0007] Application Content

[0008] One advantage of the present application is to provide an optical engine module with lower sensitivity to temperature.

[0009] Another advantage of the present application is to provide an optical engine module capable of adjusting the back focal position at the module end.

[0010] Another advantage of the present application is to provide an augmented reality device applying the aforementioned optical engine module.

[0011] In order to achieve the above at least one advantage or other advantages and purposes, the present application provides an optical engine module, which includes:

[0012] An image source device for projecting image light;

[0013] A lens system for receiving the image light and diverging the image light. The lens system includes an adjustable-focus lens module and a lens assembly arranged along the optical axis. The adjustable-focus lens module includes a lens cover and a base arranged at intervals along the optical axis, and a lens body coupled between the lens cover and the base. The lens cover and / or the base is made of glass, and the lens cover is integrated with an actuator for driving the lens cover to change its surface shape. The lens body is made of a deformable non-fluid material. The lens assembly includes at least one plastic lens;

[0014] A control system coupled to the actuator.

[0015] In some embodiments of the present application, both the lens cover and the base are made of glass, and the thickness of the lens cover is T A , and the thickness of the base is T C, the sum of the thicknesses of all the plastic lenses is T, which satisfies the following relationship: 0.0151 < (T A +T C ) / T < 0.0415.

[0016] In some embodiments of the present application, the focus-adjustable lens module can form a focal power of φ, which satisfies the following relationship: -2D ≤ φ ≤ 5D.

[0017] In some embodiments of the present application, the actuator is a piezoelectric film.

[0018] In some embodiments of the present application, the thickness of the lens cover is T A , and the thickness of the lens body is T B , which satisfies the following relationship: 0.029mm ≤ T A ≤ 0.05mm, 0.0752 < T A / T B < 0.0756.

[0019] In some embodiments of the present application, under the condition of 0 to 60 °C, the focus offset of the optical engine module is ΔL, which satisfies the following relationship: -0.4mm ≤ ΔL < 0.71mm.

[0020] In some embodiments of the present application, the total optical length of the optical engine module is TTL, the focal length of the optical engine module is f, and the total optical length of the lens system is Lens oal, which satisfies the following relationship: 0.5 < lens oal / TTL < 0.7, 2 < TTL / f < 3.2.

[0021] In some embodiments of the present application, the lens assembly has four or six plastic lenses, and along the optical axis direction from the object side to the image side, the lens assembly is sequentially denoted as the first lens module, the second lens module, the third lens module, and the fourth lens module.

[0022] In some embodiments of the present application, among the first lens module, the second lens module, and the third lens module, the positive and negative polarities of the focal powers of two groups are the same, and the focal power of the fourth lens module is positive.

[0023] In some embodiments of the present application, the positive and negative polarities of the focal powers of the first lens module and the third lens module are the same.

[0024] In some embodiments of the present application, the focal powers of the first lens module and the third lens module are both negative, the focal power of the second lens module is positive, and on the optical axis, the focus-adjustable lens module is located on the object side of the lens assembly.

[0025] In some embodiments of the present application, when there are six plastic lenses in the lens assembly, there are two plastic lenses in each of the first lens module and the second lens module, and there is only a single plastic lens in each of the third lens module and the fourth lens module.

[0026] In some embodiments of the present application, the optical powers of the first lens module and the third lens module are both positive, the optical power of the second lens module is negative, and on the optical axis, the focus-adjustable lens module is located on the image side of the lens assembly.

[0027] In some embodiments of the present application, the radius of curvature of the surface on the side of the lens assembly closest to the focus-adjustable lens module is negative.

[0028] In some embodiments of the present application, the optical powers of the first lens module and the third lens module are both positive, the optical power of the second lens module is negative, and on the optical axis, the focus-adjustable lens module is located between the third lens module and the fourth lens module.

[0029] In some embodiments of the present application, the total focal length of the first lens module, the second lens module, and the third lens module is f’, which satisfies the following relationship: 70mm < f’ < 130mm.

[0030] In some embodiments of the present application, when there are six plastic lenses in the lens assembly, there is only a single plastic lens in each of the first lens module, the second lens module, and the fourth lens module, and there are three plastic lenses in the third lens module.

[0031] In some embodiments of the present application, the image source device includes a color-combining prism and at least two single-color display chips with different colors.

[0032] In some embodiments of the present application, the clear aperture of the focus-adjustable lens module is Y, and the imaging semi-image height of the image source device is IH, which satisfies the following relationship: 1.46 < Y / IH < 3.6.

[0033] In some embodiments of the present application, the clear aperture of the focus-adjustable lens module is Y, and the maximum clear aperture of the lens assembly is Y’, which satisfies the following relationship: 0.607 < Y / Y’ < 0.964.

[0034] To achieve the above-mentioned at least one advantage or other advantages and purposes, the present application also provides an augmented reality device that applies the optical engine module as described above. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the first exemplary optical engine module of the present application.

[0036] Figure 2a It is the defocus curve graph of the first exemplary optical engine module of this application at 22°C.

[0037] Figure 2b It is the defocus curve graph of the first exemplary optical engine module of this application at 0°C.

[0038] Figure 2c It is the defocus curve graph of the first exemplary optical engine module of this application at 60°C.

[0039] Figure 3a It is the defocus curve graph of the first exemplary optical engine module of this application at 0°C when the optical power of the adjustable focus lens module is -2D.

[0040] Figure 3b It is the defocus curve graph of the first exemplary optical engine module of this application at 0°C when the optical power of the adjustable focus lens module is 5D.

[0041] Figure 3c It is the defocus curve graph of the first exemplary optical engine module of this application at 60°C when the optical power of the adjustable focus lens module is -2D.

[0042] Figure 3d It is the defocus curve graph of the first exemplary optical engine module of this application at 60°C when the optical power of the adjustable focus lens module is 5D.

[0043] Figure 4a It is the defocus correction curve graph of the first exemplary optical engine module of this application at 0°C.

[0044] Figure 4b It is the defocus correction curve graph of the first exemplary optical engine module of this application at 60°C.

[0045] Figure 5 It is the structural schematic diagram of the second exemplary optical engine module of this application.

[0046] Figure 6a It is the defocus correction curve graph of the second exemplary optical engine module of this application at 0°C.

[0047] Figure 6b It is the defocus correction curve graph of the second exemplary optical engine module of this application at 60°C.

[0048] Figure 7 It is the structural schematic diagram of the third exemplary optical engine module of this application.

[0049] Figure 8a It is the defocus correction curve graph of the third exemplary optical engine module of this application at 0°C.

[0050] Figure 8bIt is the defocus correction curve graph of the third exemplary optical engine module of this application at 60°C.

[0051] Figure 9 It is the structural schematic diagram of the fourth exemplary optical engine module of this application.

[0052] Figure 10a It is the defocus correction curve graph of the fourth exemplary optical engine module of this application at 0°C.

[0053] Figure 10b It is the defocus correction curve graph of the fourth exemplary optical engine module of this application at 60°C.

[0054] Figure 11 It is the structural schematic diagram of the fifth exemplary optical engine module of this application.

[0055] Figure 12a It is the defocus correction curve graph of the fifth exemplary optical engine module of this application at 0°C.

[0056] Figure 12b It is the defocus correction curve graph of the fifth exemplary optical engine module of this application at 60°C.

[0057] Figure 13 It is the structural schematic diagram of the sixth exemplary optical engine module of this application.

[0058] Figure 14a It is the defocus correction curve graph of the sixth exemplary optical engine module of this application at 0°C.

[0059] Figure 14b It is the defocus correction curve graph of the sixth exemplary optical engine module of this application at 60°C. Detailed implementation manners

[0060] Since the light rays in the optical engine module are emitted from the image source device to the lens system, which is the reverse of the optical path in the camera module, for the sake of easy understanding, the concepts involved in this application still follow the concepts in the original camera module field.

[0061] In some embodiments of this application, the augmented reality (AR) device includes an optical engine module and a light guiding component. The optical engine module is used to output light rays with images, and the light guiding component is used to conduct the light rays to the human eye after pupil expansion. Exemplarily, the light guiding component is an optical waveguide.

[0062] In some embodiments of this application, the optical engine module includes an image source device, a lens system, and a control system. The image source device is used to project image light rays; the lens system is used to receive the image light rays and diverge the image light rays, so that the optical engine module can project enlarged image light rays to the light guiding component.

[0063] In some embodiments of the present application, the image source device 3 includes a color combining prism 31 and at least two monochromatic display chips 32 with different emission colors. Specifically, there may be three monochromatic display chips 32, which can respectively emit R or G or B monochromatic light, and the color combining prism combines the light emitted by the three monochromatic display chips 32 to form an image light with richer colors.

[0064] In some embodiments of the present application, the lens system includes an adjustable focus lens module 1 and a lens assembly arranged along the optical axis. The adjustable focus lens module 1 includes a lens cover 11, a lens body 12, and a base 13. Among them, the lens cover 11 and the base 13 are spaced apart along the optical axis, and the lens body 12 is coupled between the lens cover 11 and the base 13. The lens cover 11 and / or the base 13 are made of glass, and the lens cover 11 is integrated with an actuator (not shown in the figure), and the actuator is used to drive the lens cover 11 to change its surface shape. The lens body 12 is made of a deformable non-fluid material, and the lens assembly includes at least one plastic lens.

[0065] In some embodiments of the present application, the control system is coupled to the actuator, so that the control system can control the actuator to act.

[0066] In the present application, by setting the adjustable focus lens module 1, since the lens cover 11 and / or the base 13 are made of glass, the temperature sensitivity of the entire lens system can be reduced, making the thermal stability of the optical engine module better. Moreover, the lens body 12 is made of a deformable non-fluid material, so that the actuator can drive the lens cover 11 to change its surface shape and drive the lens body 12 to change its surface shape, thereby changing the focal length of the adjustable focus lens module 1, and further adjusting the back focal position of the optical engine module. It can not only correct the image quality temperature drift caused by the thermal deformation of the plastic lens 2 in the optical engine module, but also make the thermal stability of the optical engine module better. Moreover, it can correct the back focal position offset generated during the assembly of the optical engine module, making the imaging quality of the optical engine module better.

[0067] The reason why the adjustable focus lens module 1 can be applied to the optical engine module of an AR device to improve the image quality is as follows: Compared with the imaging modules of photographing devices such as cameras, tablets, and mobile phones, the optical engine module of an AR device has a longer working duration, and the imaging quality of the optical engine module determines the quality of the AR device. To ensure the imaging quality of the optical engine module, the control system of an AR device usually integrates real-time image quality monitoring components such as temperature sensors or imaging sensors, thereby allowing the adjustable focus lens module 1 to act in response to the image quality changes (such as temperature effects or assembly effects) monitored by the real-time image quality monitoring components of the control system. When the imaging modules of photographing devices such as cameras, tablets, and mobile phones are working, the usage scenarios of long-term shooting (such as video recording) are less. Usually, considering costs, the volume and power consumption of the photographing device, the control system of the photographing device does not integrate the aforementioned real-time image quality monitoring components. Thus, if one considers improving the image quality through the adjustable focus lens module 1 in a photographing device, an additional control system needs to be configured, which will correspondingly increase the cost and volume.

[0068] The adjustable focus lens module 1 is an integral module and can be directly purchased on the market. When performing optical design on the optical engine module, only the overall optical performance of the adjustable focus lens module 1 needs to be considered, and there is no need to separately perform optical design on the glass lens. Therefore, compared with the prior art where the optical design directly mixes glass lenses and plastic lenses, the degree of freedom of optical design is released in this application, reducing the difficulty of optical design of the optical engine module.

[0069] In the prior art, there are also lenses that can change their focal lengths through surface shape changes, such as liquid lenses. The liquid lens mainly uses a thin film body to enclose the liquid. When the surface of the thin film body is squeezed, the thin film body drives the liquid to flow, causing the surface shape of the liquid lens to change, and ultimately resulting in a change in the focal length. In this application, since the lens body 12 of the adjustable focus lens module 1 is made of a deformable non-fluid material, the fluidity of the lens body 12 is weaker than that of the liquid, thereby enabling the adjustable focus lens module 1 to have a low posture difference (specifically referring to small optical performance differences of the AR device in different postures), making the optical performance of the optical engine module more stable. Moreover, the material of the adjustable focus lens module 1 determines that its refractive index is greater than that of the liquid lens, enabling the adjustable focus lens module 1 to be thinner and lighter under the premise of achieving the same optical performance. The exemplary thickness of the adjustable focus lens module 1 is 0.35 mm.

[0070] In some embodiments of this application, the lens body 12 is a flexible polymer. The following provides an exemplary material for the lens body 12. The lens body 12 has

[0071] (a) An elastic modulus greater than 300 Pa, thereby avoiding deformation caused by gravity in the transparent optical device element during normal operation; (b) A refractive index of 1.35 or more; (c) The absorbance of the deformable lens body in the visible light region is less than 10% per millimeter thickness;

[0072] Moreover, the lens body 12 includes a polymer network of crosslinked or partially crosslinked polymers.

[0073] In some embodiments of the present application, both the lens cover 11 and the substrate 13 are made of glass, and the thickness of the lens cover 11 is T A , and the thickness of the substrate 13 is T C , and the sum of the thicknesses of all plastic lenses is T, which satisfies the following relationship: 0.0151 < (T A + T C ) / T < 0.0415. Wherein, "the sum of the thicknesses of all plastic lenses is T" means that if the number of plastic lenses is N, let the thickness of the Nth plastic lens be T N , then T = T 1 + T 2 + …… + T N , where N is a positive integer. By designing both the lens cover 11 and the substrate 13 to be made of glass, and also through the design of the ratio of the glass thickness to the sum of the thicknesses of at least one plastic lens in the adjustable focus lens module 1 of the lens system, it is possible to combine the low cost, ease of optical design, and low temperature sensitivity of the opto-mechanical module.

[0074] In some embodiments of the present application, the adjustable focus lens module 1 can form a focal power of which satisfies the following relationship: This can enable the adjustable focus lens module 1 to meet most of the optical back focal length adjustment requirements of the opto-mechanical module.

[0075] In some embodiments of the present application, in order to make the adjustable focus lens module 1 smaller in volume and lower in energy consumption on the premise of satisfying that the adjustable focus lens module 1 has a large optical power adjustment range, the actuator is a piezoelectric film, which can meet the optical power adjustment power requirements of the adjustable focus lens module 1, and the piezoelectric film is smaller in volume and lower in energy consumption. The aforementioned liquid lens requires a greater driving force, so a voice coil (VCM) motor or a piezoelectric rod (SIDM) is usually used for driving, resulting in high energy consumption or large volume of the liquid lens. The working principle of the adjustable focus lens module 1 is as follows: when defocus correction is required for the optical engine module, the adjustable focus lens module 1 is powered on, so that the piezoelectric film deforms the lens cover 11 to a corresponding degree according to the magnitude of the applied voltage, and drives the lens body 12 to deform, thereby changing the radius of curvature of the adjustable focus lens module 1, and further adjusting the back focal position of the optical engine module to achieve defocus correction of the optical engine module.

[0076] In some embodiments of the present application, the thickness of the lens cover 11 is T A , and the thickness of the lens body 12 is T B , which satisfies the following relationship: 0.029 mm ≤ T A ≤ 0.05 mm, 0.0752 < T A / T B <0.0756, so that the lens cover 11 is thinner while meeting the rigidity requirements, making the lens cover 11 easier to bend and deform, thereby being able to further reduce the input of the actuator and save the energy consumption of the actuator.

[0077] In some embodiments of the present application, under the condition of 0 to 60 °C, the focus offset of the optical engine module is ΔL, which satisfies the following relationship: -0.4 mm ≤ ΔL < 0.71 mm.

[0078] In some embodiments of the present application, the clear aperture of the adjustable focus lens module 1 is Y, and the imaging semi-image height of the image source device 3 is IH, then 1.46 < Y / IH < 3.6. This ratio design can achieve a smaller aperture size of the optical engine module to meet the miniaturization requirements of the optical engine module.

[0079] In some embodiments of the present application, the clear aperture of the adjustable focus lens module 1 is Y, and the maximum clear aperture of the lens assembly is Y', which satisfies the following relationship: 0.607 < Y / Y' < 0.964. This ratio design can make the lateral aperture of the adjustable focus lens module 1 smaller than the maximum aperture of the plastic lens, thereby reducing the influence of the adjustable focus lens module 1 on the volume of the optical engine module.

[0080] Further design, in some embodiments of the present application, the total optical length of the optical engine module is TTL, the focal length of the optical engine module is f, and the total optical length of the lens system is Lens oal, which satisfies the following relational expressions: 0.5 < lens oal / TTL < 0.7, 2 < TTL / f < 3.2.

[0081] When the optical engine module satisfies 0.5 < lens oal / TTL < 0.7, the smaller the ratio, the smaller the size of the optical engine module in the optical axis direction, and the shorter the axial length of the lens barrel for loading plastic lenses, which is beneficial to the molding of the lens barrel. If Lens oal ≥ 0.7, the optical engine module has an overly short optical back focal length, which is not conducive to assembly; if Lens oal ≤ 0.5, the arrangement of the components in the lens system is too compact, which is not conducive to the optical design of the optical engine module and reduces the optical performance of the entire optical engine module at the same time.

[0082] When the optical engine module satisfies 2 < TTL / f < 3.2, a high-resolution image can be obtained, making the optical system of the optical engine module more compact. When TTL / f ≤ 2, it will cause a decrease in the image resolution of the optical engine module; when TTL / f ≥ 3.2, it will cause an increase in the overall size of the optical engine module.

[0083] Further design, in some embodiments of the present application, the lens assembly has four or six plastic lenses, and along the optical axis direction from the object side to the image side, the lens assembly is sequentially denoted as the first lens module 21, the second lens module 22, the third lens module 23, and the fourth lens module 24.

[0084] Further design, in some embodiments of the present application, among the first lens module 21, the second lens module 22, and the third lens module 23, the positive and negative polarities of the optical powers of two groups are the same, and the optical power of the fourth lens module 24 is positive. Specifically, the positive and negative polarities of the optical power of the first lens module 21 and the third lens module 23 are the same.

[0085] In some embodiments of the present application, the optical powers of the first lens module 21 and the third lens module 23 are both negative, the optical power of the second lens module 22 is positive, and on the optical axis, the adjustable focus lens module 1 is located on the object side of the lens assembly. In some other embodiments of the present application, the optical powers of the first lens module 21 and the third lens module 23 are both positive, the optical power of the second lens module 22 is negative, and on the optical axis, the adjustable focus lens module 1 is located on the image side of the lens assembly. In some other embodiments of the present application, the optical powers of the first lens module 21 and the third lens module 23 are both positive, the optical power of the second lens module 22 is negative, and on the optical axis, the adjustable focus lens module 1 is located between the third lens module 23 and the fourth lens module 24.

[0086] In some embodiments of the present application, when there are six plastic lenses in the lens assembly, both the first lens module 21 and the second lens module 22 have two plastic lenses, and both the third lens module 23 and the fourth lens module 24 have only a single plastic lens. In some other embodiments of the present application, when there are six plastic lenses, the first lens module 21, the second lens module 22, and the fourth lens module 24 all have only a single plastic lens, and the third lens module 23 has three plastic lenses.

[0087] In a further design, in some embodiments of the present application, the radius of curvature of the surface closest to the focus-adjustable lens module 1 in the lens assembly is negative.

[0088] In a further design, in some embodiments of the present application, when the focus-adjustable lens module 1 is located between the third lens module 23 and the fourth lens module 24, the total focal length of the first lens module 21, the second lens module 22, and the third lens module 23 is f’, which satisfies the following relationship: 70mm < f’ < 130mm, so that the light rays emitted from the focus-adjustable lens module 1 can be incident on the third lens module 23 at a small angle deviating from the optical axis, which can improve the image quality and performance.

[0089] Schematic Embodiment

[0090] Embodiment 1

[0091] Figure 1 It is a schematic structural diagram of the first exemplary optical-mechanical module of the present application.

[0092] Reference Figure 1 As shown, the first exemplary optical-mechanical module of the present application, along the optical axis direction from the object side to the image side, sequentially includes the focus-adjustable lens module 1, the aperture stop STO, the first lens P1, the second lens P2, the third lens P3, the fourth lens P4, and the image source device 3.

[0093] Among them, S1 - S2 is the lens cover 11, S2 - S3 is the lens body 12, and S3 - S4 is the base 13. The actuator of the focus-adjustable lens module 1 is not shown in the figure, and the actuator is a piezoelectric film integrated on the S1 surface of the lens cover 11.

[0094] The first lens P1 constitutes the first lens module 21, and the optical power φ of the first lens module 21 1 is negative; the second lens P2 constitutes the second lens module 22, and the optical power φ of the second lens module 22 2 is positive; the third lens P3 constitutes the third lens module 23, and the optical power φ of the third lens module 23 3 is negative; the fourth lens P4 constitutes the fourth lens module 24, and the optical power φ of the fourth lens module 24 4is positive. Among them, the surfaces S5 - S12 of all plastic lenses are plastic aspheres, which can effectively avoid manufacturing process limitations and provide a higher degree of design freedom.

[0095] In this embodiment, the surface shapes of all plastic lenses are obtained by the following formula:

[0096]

[0097] where: S i is the spherical sag of the aspherical lens Pi; Y i is the perpendicular distance from a point on the surface of the aspherical lens Pi to the optical axis; A n is the nth-order aspherical coefficient; k i is the conic coefficient of the aspherical lens Pi; r i is the radius of curvature of the aspherical surface Pi; i is a positive integer.

[0098] The image source device 3 includes a dichroic prism 31 and a monochromatic display chip 32. There are three monochromatic display chips 32, which can respectively emit R or G or B monochromatic light, and the dichroic prism 31 combines the light emitted by the three monochromatic display chips 32. Figure 1 Only the imaging surface of one of the monochromatic display chips 32 is shown in [the figure].

[0099] The total optical length TTL of the optical engine module is 15.0639 mm, the focal length f is 6.0315 mm, and the total length of the lens Lensoal (from S1 to S12) is 10.2139 mm, which satisfies the following relationship: lens oal / TTL = 0.678, TTL / f = 2.4975.

[0100] The clear aperture Y of the adjustable focus lens module 1 is 4.0108 mm, and the imaging semi-image height IH of the image source device is 1.6 mm, which satisfies the following relationship: Y / IH ≈ 2.5068. The maximum clear aperture Y' of the lens assembly is 5.6296 mm, which satisfies the following relationship: Y / Y' ≈ 0.7124.

[0101] The parameters of the optical engine module of the first exemplary embodiment of this application at room temperature (22 °C) are shown in Table 1 below:

[0102]

[0103]

[0104] Among them, the aspherical coefficients of the plastic lenses in the optical engine module of the first exemplary embodiment of this application are shown in Table 2 below:

[0105]

[0106] As shown in Table 1 above, when the optical engine module is at room temperature (22°C), the adjustable focus lens module 1 is in a powered-off state. At this time, the adjustable focus lens module 1 has no deformation and is equivalent to a flat lens. The thickness T of the lens cover 11 A is 0.04 mm, the thickness T of the lens body 12 B is 0.53 mm, the thickness T of the substrate 13 C is 0.1 mm, and it satisfies the following relationship: T A / T B ≈0.0755, T A +T C = 0.14 mm.

[0107] The thickness T1 of the first lens P1 is 2.394 mm, the thickness T2 of the second lens P2 is 2.3941 mm, the thickness T3 of the third lens P3 is 0.6602 mm, and the thickness T4 of the fourth lens P4 is 1.3677 mm. Then, the sum of the thicknesses of all the plastic lenses satisfies the following relationship: T = T1 + T2 + T3 + T4 = 6.816 mm, (T A +T B ) / T ≈ 0.0205. The surface closest to the adjustable focus lens module 1 on the lens assembly is the S5 surface of the first lens P1, and the curvature radius of the S5 surface of the first lens P1 is negative.

[0108] The optical power φ of the first lens module 21 1 is -11.8 D, the optical power φ of the second lens module 22 2 is 229 D, the optical power φ of the third lens module 23 3 is -380 D, and the optical power φ of the fourth lens module 24 4 is 214 D.

[0109] Figure 2a is the defocus curve graph of the first exemplary optical engine module of this application at 22°C. Figure 2b is the defocus curve graph of the first exemplary optical engine module of this application at 0°C. Figure 2c is the defocus curve graph of the first exemplary optical engine module of this application at 60°C.

[0110] Refer to Figure 2a As shown, when the optical engine module is at room temperature (22°C), the corresponding focal plane is at the ideal position and the image quality of the optical engine module is good.

[0111] When the environmental temperature where the optical engine module is located changes or the working time is too long and the corresponding chip generates heat, the parameters of each plastic lens in the high and low temperature states will change. The change trend satisfies the relationship between the corresponding refractive index and temperature change and the corresponding coefficient of thermal expansion of the structure, and the image quality of the optical engine module also changes accordingly. Refer to Figure 2b and Figure 2c As shown, at 0 °C, the focal position of the optical engine module will shift approximately 40 μm towards the object side; correspondingly, at 60 °C, the focal position of the optical engine module will shift approximately 65 μm towards the image side. From this, it can be seen that this optical engine module can only work properly at normal temperature. When the natural environmental temperature and the internal temperature of the optical engine module change, the focal plane position of the optical engine module deviates, and its performance will drop rapidly, making it difficult to meet the actual usage requirements of AR devices.

[0112] Figure 3a is the defocus curve graph of the first exemplary optical engine module of this application at 0 °C when the optical power of the adjustable focus lens module is -2D. Figure 3b is the defocus curve graph of the first exemplary optical engine module of this application at 0 °C when the optical power of the adjustable focus lens module is 5D. Figure 3c is the defocus curve graph of the first exemplary optical engine module of this application at 60 °C when the optical power of the adjustable focus lens module is -2D. Figure 3d is the defocus curve graph of the first exemplary optical engine module of this application at 60 °C when the optical power of the adjustable focus lens module is 5D.

[0113] When the temperature where the optical engine module is located changes, the adjustable focus lens module 1 is powered on, causing the piezoelectric film to drive the lens cover 11 to deform and driving the lens body 12 to deform, thereby adjusting the image-side focal length of the optical engine module, and further changing the position of the image-side focal plane of the optical engine module. Refer to Figures 3a - 3d As shown, when the optical power φ of the adjustable focus lens module 1 changes from -2D to 5D, at 0 °C, the variable range of the back focal position of this optical engine module is -210 to 35 μm, and at 60 °C, the variable range of the back focal position is -120 to 140 μm. This range includes the zero position, that is, the ideal focal position. Therefore, theoretically, as long as the optical power φ of the adjustable focus lens module 1 is reasonably adjusted, the defocus caused by 0 °C and 60 °C can be corrected back to the ideal focal point.

[0114] Figure 4a is the defocus correction curve graph of the first exemplary optical engine module of this application at 0 °C. Figure 4b is the defocus correction curve graph of the first exemplary optical engine module of this application at 60 °C.

[0115] The optical engine module in this embodiment is further verified by simulation. Refer to Figure 4a and Figure 4bAs shown, at 0°C, when the focus-adjustable lens module 1 is powered on to change the radius of curvature of the lens cover 11 to -527 mm, that is, when the optical power of the focus-adjustable lens module 1 is controlled at -1.05 D, the back focal position of the optical-mechanical module can be corrected to the ideal focus; at 60°C, when the focus-adjustable lens module 1 is powered on to change the radius of curvature of the lens cover 11 to 310 mm, that is, when the optical power is controlled at 1.78 D, the back focal position of the optical-mechanical module can be corrected to the ideal focus. By observing the corresponding corrected MTF curve, it can be found that the corresponding image quality basically does not drop, which proves the feasibility of realizing image quality correction at different temperatures by this utilization method.

[0116] It can be understood that in addition to the optical-mechanical module being affected by the environment, if the pre-designed back focal position is offset due to the assembly process of the optical-mechanical module, the focus-adjustable lens module 1 can also be powered on to drive the actuator to change the surface shapes of the lens cover 11 and the lens body 12, so as to adjust the optical power φ of the focus-adjustable lens module 1, and finally realize the defocus correction of the optical-mechanical module.

[0117] Embodiment 2

[0118] The difference between this embodiment and Embodiment 1 is that:

[0119] Figure 5 It is a schematic structural diagram of the second exemplary optical-mechanical module of the present application.

[0120] Reference Figure 5 As shown, there are six plastic lenses, namely the first lens P1, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5, and the sixth lens P6. The first lens P1 and the second lens P2 form the first lens module 21, the third lens P3 and the fourth lens P4 form the second lens module 22, the fifth lens P5 forms the third lens module 23, and the sixth lens P6 forms the fourth lens module 24.

[0121] The total optical length TTL of the optical-mechanical module is 14.8944 mm, the focal length f is 4.8145 mm, and the total length of the lens Lensoal (from S1 to S16) is 8.9944 mm, which satisfies the following relationship: lens oal / TTL = 0.604, TTL / f = 3.09.

[0122] The clear aperture Y of the focus-adjustable lens module 1 is 3.2206 mm, and the imaging semi-image height IH of the image source device is 2.2 mm, which satisfies the following relationship: Y / IH ≈ 1.4639. The maximum clear aperture Y' of the lens assembly is 5.2968 mm, which satisfies the following relationship: Y / Y' ≈ 0.608.

[0123] The parameters of the optical-mechanical module of the second exemplary embodiment of the present application at room temperature (22°C) are shown in Table 3 below:

[0124]

[0125]

[0126] Among them, the aspherical coefficients of the plastic lens in the optical engine module of the second exemplary embodiment of the present application are shown in Table 4 below:

[0127]

[0128] As shown in Table 3 above, when the optical engine module is at room temperature (22 °C), the adjustable focus lens module 1 is in a powered-off state. At this time, the adjustable focus lens module 1 has no deformation and is equivalent to a flat lens. The thickness T of the lens cover 11 A is 0.029 mm, the thickness T of the lens body 12 B is 0.385 mm, the thickness T of the substrate 13 C is 0.073 mm, and it satisfies the following relationship: T A / T B ≈0.0753, T A +T C = 0.102 mm.

[0129] The thickness T1 of the first lens P1 is 0.6924 mm, the thickness T2 of the second lens P2 is 0.4071 mm, the thickness T3 of the third lens P3 is 1.1031 mm, the thickness T4 of the fourth lens P4 is 1.973 mm, the thickness T5 of the fifth lens P5 is 0.5898 mm, and the thickness T6 of the sixth lens P6 is 1.9657 mm. Then the sum of the thicknesses of all the plastic lenses satisfies the following relationship: T = T1 + T2 + T3 + T4 + T5 + T6 = 6.7311 mm, (T A +T B ) / T ≈ 0.0152.

[0130] The optical power φ of the first lens module 21 1 is -364 D, the optical power φ of the second lens module 22 2 is 473 D, the optical power φ of the third lens module 23 3 is -350 D, and the optical power φ of the fourth lens module 24 4 is 208 D.

[0131] When the optical power φ of the adjustable focus lens module 1 changes from -2 D to 5 D, at 0 °C, the variable range of the back focal position of the optical engine module is -140 to 12 μm, and at 60 °C, the variable range of the back focal position is -60 to 105 μm.

[0132] At 0°C, the focal point of the optical-mechanical module shifts approximately 32 μm towards the object side; at 60°C, the focal point of the optical-mechanical module shifts approximately 60 μm towards the image side.

[0133] Figure 6a It is the defocus correction curve graph of the second exemplary optical-mechanical module of the present application at 0°C. Figure 6b It is the defocus correction curve graph of the second exemplary optical-mechanical module of the present application at 60°C.

[0134] For the optical-mechanical module in this embodiment, through further simulation verification, referring to Figure 6a and Figure 6b as shown, at 0°C, when the adjustable-focus lens module 1 is powered on and the curvature radius of the lens cover 11 becomes -397 mm, that is, the optical power of the adjustable-focus lens module 1 is controlled at -1.39 D, the back focal position of the optical-mechanical module can be corrected to the ideal focal point; at 60°C, when the adjustable-focus lens module 1 is powered on and the curvature radius of the lens cover 11 becomes 234 mm, that is, the optical power is controlled at 2.36 D, the back focal position of the optical-mechanical module can be corrected to the ideal focal point.

[0135] Embodiment 3

[0136] The difference between this embodiment and Embodiment 1 is that:

[0137] Figure 7 It is the structural schematic diagram of the third exemplary optical-mechanical module of the present application.

[0138] The optical power of the first lens module 21 is positive, the optical power of the second lens module 22 is negative, the optical power of the third lens module 23 is positive, and the optical power of the fourth lens module 24 is positive. The aperture stop STO is located on the object side of the first lens module 21. The adjustable-focus lens module 1 is located between the third lens module 23 and the fourth lens module 24.

[0139] The total optical length TTL of the optical-mechanical module is 14.6502 mm, the focal length f is 5.9968 mm, and the total length of the lens Lensoal (from S1 to S12) is 8.4686 mm, which satisfies the following relationship: lens oal / TTL = 0.578, TTL / f = 2.443.

[0140] The clear aperture Y of the adjustable-focus lens module 1 is 5.7488 mm, and the imaging semi-image height IH of the image source device is 1.6 mm, which satisfies the following relationship: Y / IH = 3.593. The maximum clear aperture Y' of the lens assembly is 5.966 mm, which satisfies the following relationship: Y / Y' ≈ 0.9636.

[0141] The total focal length f’ of the first lens module 21, the second lens module 22, and the third lens module 23 is approximately 126.9201.

[0142] The parameters of the optical engine module of the third exemplary embodiment of the present application at room temperature (22 °C) are shown in Table 5 below:

[0143]

[0144]

[0145] Among them, the aspheric coefficients of the plastic lenses in the optical engine module of the third exemplary embodiment of the present application are shown in Table 6 below:

[0146]

[0147] As shown in Table 5 above, when the optical engine module is at room temperature (22 °C), the adjustable focus lens module 1 is in a power-off state. At this time, the adjustable focus lens module 1 has no deformation and is equivalent to a flat lens. The thickness T of the lens cover 11 A is 0.05 mm, the thickness T of the lens body 12 B is 0.6625 mm, the thickness T of the base 13 C is 0.125 mm, and it satisfies the following relationship: T A / T B ≈0.0755, T A +T C = 0.175 mm.

[0148] The thickness T1 of the first lens P1 is 0.8527 mm, the thickness T2 of the second lens P2 is 0.8579 mm, the thickness T3 of the third lens P3 is 1.6197 mm, and the thickness T4 of the fourth lens P4 is 1.9943 mm. Then the sum of the thicknesses of all the plastic lenses satisfies the following relationship: T = T1 + T2 + T3 + T4 = 5.3246 mm, (T A +T B ) / T ≈ 0.0329.

[0149] The optical power φ of the first lens module 21 1 is 135 D, the optical power φ of the second lens module 22 2 is -346 D, the optical power φ of the third lens module 23 3 is 131 D, and the optical power φ of the fourth lens module 24 4 is 167 D.

[0150] When the optical power φ of the adjustable-focus lens module 1 varies from -2D to 5D, at 0°C, the variable range of the back focal position of the opto-mechanical module is -185 to 38 μm, and at 60°C, the variable range of the back focal position is -110 to 120 μm.

[0151] At 0°C, the focal position of the opto-mechanical module will shift approximately 30 μm towards the object side; at 60°C, the focal position of the opto-mechanical module will shift approximately 53 μm towards the image side.

[0152] Figure 8a It is the defocus correction curve graph of the third exemplary opto-mechanical module of the present application at 0°C. Figure 8b It is the defocus correction curve graph of the third exemplary opto-mechanical module of the present application at 60°C.

[0153] The opto-mechanical module in this embodiment is further verified by simulation, referring to Figure 8a and Figure 8b As shown, at 0°C, when the adjustable-focus lens module 1 is powered on to make the radius of curvature of the lens cover 11 become -550 mm, that is, the optical power of the adjustable-focus lens module 1 is controlled at -1D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point; at 60°C, when the adjustable-focus lens module 1 is powered on to make the radius of curvature of the lens cover 11 become 330 mm, that is, the optical power is controlled at 1.68D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point.

[0154] Embodiment 4

[0155] The difference between this embodiment and Embodiment 3 is:

[0156] Figure 9 It is the structural schematic diagram of the fourth exemplary opto-mechanical module of the present application.

[0157] Referring to Figure 9 As shown, there are six plastic lenses, namely the first lens P1, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5, and the sixth lens P6. The first lens P1 constitutes the first lens module 21, the second lens P2 constitutes the second lens module 22, the third lens P3, the fourth lens P4, and the fifth lens P5 constitute the third lens module 23, and the sixth lens P6 constitutes the fourth lens module 24.

[0158] The total optical length TTL of the opto-mechanical module is 15.18 mm, the focal length f is 4.817 mm, and the total length of the lens lenses Lens oal (from S1 to S16) is 9.2801 mm, which satisfies the following relational expressions: lens oal / TTL = 0.611, TTL / f = 3.151.

[0159] The clear aperture Y of the adjustable focus lens module 1 is 5.062 mm, and the imaging semi-image height IH of the image source device is 2.2 mm, which satisfies the following relationship: Y / IH≈2.3009. The maximum clear aperture Y' of the lens assembly is 5.4386 mm, which satisfies the following relationship: Y' / Y≈0.9308.

[0160] The total focal length f' of the first lens module 21, the second lens module 22, and the third lens module 23 is approximately 71.0325.

[0161] The parameters of the optical engine module of the fourth exemplary embodiment of the present application at room temperature (22 °C) are shown in Table 7 below:

[0162]

[0163]

[0164] Among them, the aspherical coefficients of the plastic lenses in the optical engine module of the fourth exemplary embodiment of the present application are shown in Table 8 below:

[0165]

[0166]

[0167] As shown in Table 7 above, when the optical engine module is at room temperature (22 °C), the adjustable focus lens module 1 is in a power-off state. At this time, the adjustable focus lens module 1 has no deformation and is equivalent to a flat lens. The thickness T of the lens cover 11 A is 0.048 mm, the thickness T of the lens body 12 B is 0.636 mm, and the thickness T of the base 13 C is 0.12 mm, which satisfies the following relationship: T A / T B ≈0.0755, T A +T C = 0.168 mm.

[0168] The thickness T1 of the first lens P1 is 0.4038 mm, the thickness T2 of the second lens P2 is 0.4 mm, the thickness T3 of the third lens P3 is 1.337 mm, the thickness T4 of the fourth lens P4 is 2.1946 mm, the thickness T5 of the fifth lens P5 is 0.6342 mm, and the thickness T6 of the sixth lens P6 is 1.6526 mm. Then the sum of the thicknesses of all the plastic lenses satisfies the following relationship: T = T1 + T2 + T3 + T4 + T5 + T6 = 6.6222 mm, (T A +T B ) / T≈0.0254.

[0169] The optical power φ of the first lens module 21 1 is 15 D, and the optical power φ of the second lens module 22 2 is -304 D. The optical power φ of the third lens module 23 3 is 325 D, and the optical power φ of the fourth lens module 24 4 is 202 D.

[0170] When the optical power φ of the focus-adjustable lens module 1 changes from -2 D to 5 D, at 0 °C, the range of change in the back focal position of the opto-mechanical module is -150 to 15 μm, and at 60 °C, the range of change in the back focal position is -60 to 110 μm.

[0171] At 0 °C, the focal position of the opto-mechanical module will shift approximately 33 μm towards the object side; at 60 °C, the focal position of the opto-mechanical module will shift approximately 62 μm towards the image side.

[0172] Figure 10a is the defocus correction curve graph of the fourth exemplary opto-mechanical module of the present application at 0 °C. Figure 10b is the defocus correction curve graph of the fourth exemplary opto-mechanical module of the present application at 60 °C.

[0173] For the opto-mechanical module in this embodiment, through further simulation verification, referring to Figure 10a and Figure 10b as shown, at 0 °C, when the focus-adjustable lens module 1 is energized to make the radius of curvature of the lens cover 11 become -389 mm, that is, when the optical power of the focus-adjustable lens module 1 is controlled at -1.42 D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point; at 60 °C, when the focus-adjustable lens module 1 is energized to make the radius of curvature of the lens cover 11 become 228 mm, that is, when the optical power is controlled at 2.43 D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point.

[0174] Embodiment 5

[0175] The difference between this embodiment and Embodiment 3 is that:

[0176] Figure 11 is the structural schematic diagram of the fifth exemplary opto-mechanical module of the present application. Referring to Figure 11 as shown, the focus-adjustable lens module 1 is located between the fourth lens module 24 and the dichroic prism 31.

[0177] The total optical length TTL of the opto-mechanical module is 13.7048 mm, the focal length f is 5.991 mm, and the total length of the lens lenses Lensoal (from S1 to S12) is 7.9548 mm, which satisfies the following relationship: lens oal / TTL = 0.58, TTL / f = 2.288.

[0178] The clear aperture Y of the adjustable focus lens module 1 is 5.5172 mm, and the imaging semi-image height IH of the image source device is 1.6 mm. The following relationship is satisfied: Y / IH ≈ 3.4483. The maximum clear aperture Y' of the lens assembly is 5.7464 mm, and the following relationship is satisfied: Y / Y' = 0.9601.

[0179] The parameters of the optical engine module of the fifth exemplary embodiment of the present application at room temperature (22 °C) are shown in Table 9 below:

[0180]

[0181] Among them, the aspherical coefficients of the plastic lenses in the optical engine module of the fifth exemplary embodiment of the present application are shown in Table 10 below:

[0182]

[0183]

[0184] As shown in Table 9 above, when the optical engine module is at room temperature (22 °C), the adjustable focus lens module 1 is in a power-off state. At this time, the radius of curvature of the lens cover 11 and the lens body 12 of the adjustable focus lens module 1 are also used as design variables to optimize the tolerance sensitivity and improve the production yield. Specifically, the optical power of the adjustable focus lens module 1 is 1.26 D. The thickness T A of the lens cover 11 is 0.05 mm, the thickness T B of the lens body 12 is 0.6625 mm, and the thickness T C of the substrate 13 is 0.125 mm. The following relationship is satisfied: T A / T B ≈ 0.0755, T A + T C = 0.175 mm.

[0185] The thickness T1 of the first lens P1 is 0.7327 mm, the thickness T2 of the second lens P2 is 0.3817 mm, the thickness T3 of the third lens P3 is 1.2156 mm, and the thickness T4 of the fourth lens P4 is 1.8957 mm. The sum of the thicknesses of all plastic lenses satisfies the following relationship: T = T1 + T2 + T3 + T4 = 4.2257 mm, (T A + T B ) / T ≈ 0.0414. The surface closest to the adjustable focus lens module 1 on the lens assembly is the S8 surface of the fourth lens P4, and the radius of curvature of the S8 surface of the fourth lens P4 is negative.

[0186] The optical power φ of the first lens module 21 1is 132D, and the optical power φ of the second lens module 22 2 is -360D, and the optical power φ of the third lens module 23 3 is 88D, and the optical power φ of the fourth lens module 24 4 is 218D.

[0187] When the optical power φ of the adjustable focus lens module 1 changes from -2D to 5D, at 0 °C, the range of change in the back focal position of the opto-mechanical module is -110 to 40 μm, and at 60 °C, the range of change in the back focal position is -30 to 125 μm.

[0188] At 0 °C, the focal position of the opto-mechanical module will shift approximately 29 μm towards the object side; at 60 °C, the focal position of the opto-mechanical module will shift approximately 53 μm towards the image side.

[0189] Figure 12a is the defocus correction curve graph of the fifth exemplary opto-mechanical module of the present application at 0 °C. Figure 12b is the defocus correction curve graph of the fifth exemplary opto-mechanical module of the present application at 60 °C.

[0190] For the opto-mechanical module in this embodiment, through further simulation verification, referring to Figure 12a and Figure 12b as shown, at 0 °C, when the adjustable focus lens module 1 is energized to make the curvature radius of the lens cover 11 become -4256 mm, that is, the optical power of the adjustable focus lens module 1 is controlled at -0.13D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point; at 60 °C, when the adjustable focus lens module 1 is energized to make the curvature radius of the lens cover 11 become 152 mm, that is, the optical power is controlled at 3.64D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point.

[0191] Example 6

[0192] The difference between this embodiment and Example 4 is that:

[0193] Figure 13 is the structural schematic diagram of the sixth exemplary opto-mechanical module of the present application.

[0194] The total optical length TTL of this opto-mechanical module is 15.2726 mm, the focal length f is 4.8142 mm, and the total length of the lens lens Lensoal (from S1 to S16) is 9.3726 mm, which satisfies the following relational expressions: lens oal / TTL = 0.614, TTL / f = 3.172.

[0195] The clear aperture Y of the adjustable focus lens module 1 is 5.3316 mm, and the imaging semi-image height IH of the image source device is 2.2 mm. The following relationship is satisfied: Y / IH≈2.4235. The maximum clear aperture Y' of the lens assembly is 5.5406 mm, and the following relationship is satisfied: Y / Y'≈0.9623.

[0196] The parameters of the optical engine module of the sixth exemplary embodiment of the present application at room temperature (22 °C) are shown in Table 11 below:

[0197]

[0198] Among them, the aspheric coefficients of the plastic lenses in the optical engine module of the sixth exemplary embodiment of the present application are shown in Table 12 below:

[0199]

[0200]

[0201] As shown in Table 11 above, when the optical engine module is at room temperature (22 °C), the adjustable focus lens module 1 is in a power-off state. At this time, the adjustable focus lens module 1 has no deformation and is equivalent to a flat lens. The thickness T of the lens cover 11 A is 0.048 mm, the thickness T of the lens body 12 B is 0.636 mm, the thickness T of the substrate 13 C is 0.12 mm, and the following relationship is satisfied: T A / T B ≈0.0755, T A +T C = 0.168 mm.

[0202] The thickness T1 of the first lens P1 is 0.6869 mm, the thickness T2 of the second lens P2 is 0.7621 mm, the thickness T3 of the third lens P3 is 1.3083 mm, the thickness T4 of the fourth lens P4 is 1.3246 mm, the thickness T5 of the fifth lens P5 is 0.6403 mm, and the thickness T6 of the sixth lens P6 is 2.2496 mm. Then the sum of the thicknesses of all the plastic lenses satisfies the following relationship: T = T1 + T2 + T3 + T4 + T5 + T6 = 6.9718 mm, (T A +T B ) / T≈0.0241. The optical power φ 1 of the first lens module 21 is 115 D, the optical power φ 2 of the second lens module 22 is -394 D, the optical power φ 3 of the third lens module 23 is 273 D, the optical power φ 4It is 212D.

[0203] When the optical power φ of the adjustable focus lens module 1 changes from -2D to 5D, at 0 °C, the variable range of the back focal position of the opto-mechanical module is -147 to 10 μm, and at 60 °C, the variable range of the back focal position is -45 to 120 μm.

[0204] At 0 °C, the focal position of the opto-mechanical module will shift approximately 38 μm towards the object side; at 60 °C, the focal position of the opto-mechanical module will shift approximately 71 μm towards the image side.

[0205] Figure 14a It is the defocus correction curve graph of the sixth exemplary opto-mechanical module of the present application at 0 °C. Figure 14b It is the defocus correction curve graph of the sixth exemplary opto-mechanical module of the present application at 60 °C.

[0206] For the opto-mechanical module in this embodiment, through further simulation verification, referring to Figure 14a and Figure 14b as shown, at 0 °C, when the adjustable focus lens module 1 is powered on to make the curvature radius of the lens cover 11 become -300 mm, that is, when the optical power of the adjustable focus lens module 1 is controlled at -1.85D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point; at 60 °C, when the adjustable focus lens module 1 is powered on to make the curvature radius of the lens cover 11 become 174 mm, that is, when the optical power is controlled at 3.17D, the back focal position of the opto-mechanical module can be corrected to the ideal focal point.

[0207] In addition, for the aforementioned 6 exemplary opto-mechanical modules, since the adjustable lens module 1 needs to be powered, a more ideal arrangement of the adjustable lens module 1 is to be provided outside the lens barrel. Considering that the plastic lenses in the opto-mechanical modules involved in Embodiment 1, Embodiment 2, Embodiment 5, and Embodiment 6 can be assembled into the same lens barrel, while the plastic lenses in the opto-mechanical modules involved in Embodiment 3 and Embodiment 4 need to be divided into two groups (the first lens module 21, the second lens module 22, and the third lens module 23 are the first group, and the fourth lens module 24 is the second group), the assembly process of the opto-mechanical modules involved in Embodiment 1, Embodiment 2, Embodiment 5, and Embodiment 6 is simpler. However, the optical performance of the opto-mechanical modules involved in Embodiment 3 and Embodiment 4 is better.

[0208] For the optical engine modules involved in Embodiment 1, Embodiment 2, Embodiment 5, and Embodiment 6, since the small end of the lens system is on the object side, the size of the adjustable lens module 1 in the optical engine modules involved in Embodiment 1 and Embodiment 2 is smaller. Because the adjustable lens module 1 is expensive (mainly due to the high cost of the piezoelectric film), the raw material cost of the optical engine modules involved in Embodiment 1 and Embodiment 2 is low. It can be understood that in other embodiments, due to the relationship between the light exit hole size of the optical engine module and the display chip size of the image source device, when the small end of the lens system is on the image side, placing the adjustable focus lens module 1 on the image side of all plastic lenses (similar to the position of the adjustable focus lens module 1 in Embodiment 5 and Embodiment 6) can reduce the cost of the optical engine module.

Claims

1. An optical engine module, characterized in that, it includes: an image source device for projecting image light; a lens system for receiving the image light and diverging the image light, the lens system comprising a focus-adjustable lens module and a lens assembly arranged along the optical axis, the focus-adjustable lens module comprising a lens cover and a base spaced along the optical axis, and a lens body coupled between the lens cover and the base, the lens cover and / or the base being made of glass, and the lens cover being integrated with an actuator for driving the lens cover to undergo a surface shape change, the lens body being made of a deformable non-fluid material, and the lens assembly comprising at least one plastic lens; a control system coupled to the actuator.

2. The optical engine module according to claim 1, characterized in that, Both the lens cover and the substrate are made of glass, and the thickness of the lens cover is T A , and the thickness of the substrate is T C , and the sum of the thicknesses of all the plastic lenses is T, which satisfies the following relationship: 0.0151 < (T A + T C ) / T < 0.0415。 3. The optical engine module according to claim 1, characterized in that, the focus-adjustable lens module can form a focal power of φ, which satisfies the following relationship: -2D ≤ φ ≤ 5D.

4. The optical engine module according to claim 3, characterized in that, the actuator is a piezoelectric thin film.

5. The optical engine module according to claim 3, characterized in that, The thickness of the lens cover is T A , and the thickness of the lens body is T B , which satisfies the following relationship: 0.029 mm ≤ T A ≤ 0.05 mm, 0.0752 < T A / T B <0.0756.

6. The optical engine module according to claim 5, characterized in that, under the condition of 0 to 60 °C, the focus offset of the optical engine module is ΔL, which satisfies the following relationship: -0.4 mm ≤ ΔL < 0.71 mm.

7. The optical engine module according to claim 6, characterized in that, the total optical length of the optical engine module is TTL, the focal length of the optical engine module is f, and the total optical length of the lens system is Lens oal, which satisfies the following relationship: 0.5 < lens oal / TTL < 0.7, 2 < TTL / f < 3.

2.

8. The optical engine module according to claim 7, characterized in that, the lens assembly has four or six plastic lenses, and along the optical axis from the object side to the image side, the lens assembly is sequentially denoted as a first lens module, a second lens module, a third lens module, and a fourth lens module.

9. The optical engine module according to claim 8, characterized in that, in the first lens module, the second lens module, and the third lens module, the positive and negative polarities of the focal powers of two of them are the same, and the focal power of the fourth lens module is positive.

10. The optical engine module according to claim 9, characterized in that, the positive and negative polarities of the focal powers of the first lens module and the third lens module are the same.

11. The optical engine module according to claim 10, characterized in that, the focal powers of the first lens module and the third lens module are both negative, the focal power of the second lens module is positive, and on the optical axis, the focus-adjustable lens module is located on the object side of the lens assembly.

12. The optical engine module according to claim 11, characterized in that, when the lens assembly has six plastic lenses, both the first lens module and the second lens module have two plastic lenses, and both the third lens module and the fourth lens module have only a single plastic lens.

13. The optical engine module according to claim 10, characterized in that, The optical power of the first lens module and the optical power of the third lens module are both positive, the optical power of the second lens module is negative, and on the optical axis, the focus-adjustable lens module is located on the image side of the lens assembly.

14. The optical-mechanical module according to claim 11 or 13, wherein, the radius of curvature of the surface of the lens assembly closest to the focus-adjustable lens module is negative.

15. The optical-mechanical module according to claim 10, wherein, the optical power of the first lens module and the optical power of the third lens module are both positive, the optical power of the second lens module is negative, and on the optical axis, the focus-adjustable lens module is located between the third lens module and the fourth lens module.

16. The optical-mechanical module according to claim 15, wherein, the total focal length of the first lens module, the second lens module and the third lens module is f’, which satisfies the following relationship: 70mm < f’ < 130mm.

17. The optical-mechanical module according to claim 13 or 15, wherein, when the lens assembly has six plastic lenses, the first lens module, the second lens module and the fourth lens module each have only a single plastic lens, and the third lens module has three plastic lenses.

18. The optical-mechanical module according to claim 7, wherein, the image source device includes a color-combining prism and at least two single-color display chips with different emission colors.

19. The optical-mechanical module according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 13 or 15 or 16 or 18, wherein, the clear aperture of the focus-adjustable lens module is Y, and the imaging semi-image height of the image source device is IH, which satisfies the following relationship: 1.46 < Y / IH < 3.

6.

20. The optical-mechanical module according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 13 or 15 or 16 or 18, wherein, the clear aperture of the focus-adjustable lens module is Y, and the maximum clear aperture of the lens assembly is Y’, which satisfies the following relationship: 0.607 < Y / Y’ < 0.

964.

21. An augmented reality device, wherein, it applies the optical-mechanical module according to any one of claims 1 to 20.

Images