Optical module and head-mounted display device

Abstract

Embodiments of the present application provide an optical module and a head-mounted display device. The optical module comprises, in sequence along a light transmission direction: a second lens group and a first lens group, the first lens group has positive optical power, and the second lens group has negative optical power; in the optical module, the sum of optical powers of all positive lenses is φ 正 , and the sum of optical powers of all negative lenses is φ 负 ; the optical module satisfies: -2.2 < φ 正 / φ 负 < -1.9.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of near-eye display imaging technology, and more particularly, to an optical module and a head-mounted display device. BACKGROUND

[0002] In recent years, augmented reality (AR) technology and virtual reality (VR) technology have been applied in, for example, smart wearable devices and have rapidly developed. The core component of augmented reality technology and virtual reality technology is an optical module. The display effect of the optical module will directly determine the quality of the smart wearable device.

[0003] For example, as VR products continue to develop, the forms of VR products have diversified, and users have more and more choices for product forms. This has led to the emergence of a demand for specific use scenarios that use small sizes and provide appropriate FOVs. Such specific use scenarios generally require low distortion, low chromatic aberration, high definition, high reliability, and the like.

[0004] Therefore, there is a need to provide a new optical module to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a new technical solution for an optical module and a head-mounted display device.

[0006] In a first aspect, the present application provides an optical module. The optical module comprises, in order along a light transmission direction: a second lens group and a first lens group, the first lens group has a positive optical power, and the second lens group has a negative optical power.

[0007] In the optical module, the sum of the optical powers of all positive lenses is φ positive, and the sum of the optical powers of all negative lenses is φ negative.

[0008] The optical module satisfies -2.2 < φ negative / φ positive < -1.9. 正 / φ 负 <-1.9.

[0009] Optionally, the optical power of the optical module is φ, the optical power of the first lens group is φ1, and the optical power of the second lens group is φ2.

[0010] The optical module satisfies 1.2 < φ / (φ1+φ2) < 1.5.

[0011] Optionally, the optical module satisfies 1.5 < φ 正 / φ1 < 1.8.

[0012] Optionally, the optical module satisfies 2 < φ负 / φ2<8.

[0013] Optionally, the optical module satisfies: 1.4<φ 正 / φ<1.8.

[0014] Optionally, the optical module satisfies: -1<φ 负 / φ<-0.5.

[0015] Optionally, the effective focal length of the first lens group is f1, and the effective focal length of the second lens group is f2; the optical module satisfies: -10<f2 / f1<-3.

[0016] Optionally, the effective focal length of the optical module is F, and the optical module satisfies: 0.8<f1 / F<1.2.

[0017] Optionally, the first lens group comprises at least one lens with positive optical power.

[0018] Optionally, the first lens group comprises a third lens, a second lens and a first lens along the light transmission direction, and the optical power order of the third lens, the second lens and the first lens is: positive, negative, positive.

[0019] Optionally, the second lens group comprises at least one lens with negative optical power.

[0020] Optionally, the second lens group comprises a fifth lens and a fourth lens along the light transmission direction, and the optical power order of the fifth lens and the fourth lens is negative, negative or negative, positive.

[0021] In a second aspect, the embodiments of the present application provide a head-mounted display device. The head-mounted display device comprises:

[0022] a housing, and

[0023] The optical module as described in the first aspect.

[0024] According to the embodiments of the present application, an optical module is provided. The optical module comprises a first lens group with positive optical power and a second lens group with negative optical power. By limiting the ratio of the sum of the optical power of the lenses with positive optical power to the sum of the optical power of the lenses with negative optical power in the optical module, the optical module reasonably allocates the positive and negative optical power of the lenses, and reasonably sets the positive and negative optical power allocation ratio, which can greatly reduce distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect.

[0025] Other features of the present application and their advantages will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0027] Figure 1 Structure schematic diagram of optical module provided for embodiments of the present application.

[0028] Figure 2 Structure schematic diagram of optical module provided for embodiments of the present application. Figure 1 Schematic diagram of point array of optical module.

[0029] Figure 3 Structure schematic diagram of optical module provided for embodiments of the present application. Figure 1 Distortion diagram of optical module.

[0030] Figure 4 Structure schematic diagram of optical module provided for embodiments of the present application. Figure 1 Vernier diagram of optical module.

[0031] Figure 5 Structure schematic diagram of optical module provided for embodiments of the present application.

[0032] Figure 6 Structure schematic diagram of optical module provided for embodiments of the present application. Figure 5 Schematic diagram of point array of optical module.

[0033] Figure 7 Structure schematic diagram of optical module provided for embodiments of the present application. Figure 5 Distortion diagram of optical module.

[0034] Figure 8 Vernier diagram of optical module. Figure 5 BRIEF DESCRIPTION OF DRAWINGS

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 1, first lens group; 10, first lens; 11, second lens; 12, third lens;

[0037] 2, second lens group; 21, fourth lens; 22, fifth lens;

[0038] 3, display;

[0039] 4, human eye.DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present application will now be described in detail with reference to the figures. It should be noted that the relative arrangements, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0042] Techniques and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification.

[0043] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Thus, other examples of the exemplary embodiments can have different values.

[0044] It should be noted that like reference numerals and letters refer to like items throughout the attached drawings, and thus once an item is defined in one drawing, it is not necessary that it be further discussed in the remaining drawings.

[0045] The following detailed description is presented in connection with the appended drawings. Figures 1 to 8 The optical module and the head-mounted display device provided by the embodiments of the present application are described in detail.

[0046] According to an aspect of the embodiments of the present application, an optical module is provided, which is a straight-through optical structure design and can be applied to a head-mounted display (HMD). For example, a VR head-mounted device, such as a VR glasses or a VR helmet, is not specifically limited by the embodiments of the present application.

[0047] The embodiments of the present application provide an optical module. Referring to Figure 1 and Figure 5 , the optical module includes, in sequence along the light transmission direction, a second lens group 2 and a first lens group 1, the first lens group 1 has a positive optical power, and the second lens group 2 has a negative optical power.

[0048] In the optical module, the sum of the optical powers of all the positive lenses is φ 正 , and the sum of the optical powers of all the negative lenses is φ 负 .

[0049] The optical module satisfies -2.2<φ 正 / φ 负 <-1.9.

[0050] In the embodiments of the present application, a straight-through optical path architecture is provided to realize near-eye display. Specifically, the optical module includes, in sequence along the light transmission direction, a second lens group 2 and a first lens group 1. Referring to Figure 1 and Figure 5, the first lens group 1 is arranged closer to the human eye 4 than the second lens group 2. The second lens group 2 is arranged closer to the display 3 than the first lens group 1. Wherein the light rays emitted from the display 3, after exiting the light emitting surface of the display 33, are transmitted through the second lens group 2, and then transmitted through the first lens group 1, and then enter the human eye 4.

[0051] In the optical module, the first lens group 1 has positive power, for example, the sum of powers of the lenses included in the first lens group 1 is positive, and the first lens group 1 includes at least one lens with positive power. In one example, the first lens group 1 includes one lens with positive power; or the first lens group 1 includes one lens with positive power and one lens with negative power, wherein the sum of powers of the two lenses is positive; or the first lens group 1 includes two lenses with positive power and one lens with negative power, wherein the sum of powers of the three lenses is positive; or the first lens group 1 includes three lenses, four lenses or more, as long as the sum of powers of the lenses included in the first lens group 1 is positive.

[0052] The second lens group 2 has negative power, for example, the sum of powers of the lenses included in the second lens group 2 is negative, and the second lens group 2 includes at least one lens with negative power. In one example, the second lens group 2 includes one lens with negative power; or the second lens group 2 includes one lens with positive power and one lens with negative power, wherein the sum of powers of the two lenses is negative; or the second lens group 2 includes two lenses with negative power; or the second lens group 2 includes three lenses, four lenses or more, as long as the sum of powers of the lenses included in the second lens group 2 is negative.

[0053] In the embodiments of the present application, the imaging display is performed by a lens group with positive power and a lens group with negative power. Specifically, the lenses in the optical module are reasonably grouped, and the powers of the lens groups are reasonably distributed, so that the first lens group 1 and the second lens group 2 realize the combination of positive and negative lens groups, and realize low chromatic aberration, low distortion and high definition imaging.

[0054] In the optical module, the sum of powers of all positive lenses is φ 正 , for example, the sum of powers of the positive lenses in the first lens group 1 and the positive lenses in the second lens group 2 is φ 正 , or the second lens group 2 does not include positive lenses, and the sum of powers of the positive lenses in the first lens group 1 is φ 正 .

[0055] In the optical module, the sum of powers of all negative lenses is φ负 For example, the sum of powers of the lenses with negative power in the first lens group 1 and the second lens group 2 is φ 负 Or the first lens group 1 does not contain lenses with negative power, and the sum of powers of the lenses with negative power in the second lens group 2 is φ 负 .

[0056] Specifically, the optical module satisfies: -2.2<φ 正 / φ 负 <-1.9, the ratio of the sum of powers of the positive lenses in the optical module to the sum of powers of the negative lenses in the optical module is limited, and when φ 正 / φ 负 In this range, specifically, the sum of powers of the positive lenses is greater than the absolute value of the sum of powers of the negative lenses in the optical module, and the sum of powers of the positive lenses is almost twice the absolute value of the sum of powers of the negative lenses in the optical module, so that the optical module reasonably sets the positive and negative powers of the lenses, and reasonably sets the positive and negative power distribution ratio, which can reduce distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect.

[0057] In one embodiment, the optical module has a power of φ, the first lens group 1 has a power of φ1, and the second lens group 2 has a power of φ2.

[0058] The optical module satisfies: 1.2<φ / (φ1+φ2)<1.5.

[0059] In this embodiment, the ratio of the power of the optical module (i.e. the total power of the optical module) to the sum of the powers of the first lens group 1 and the second lens group 2 is limited, which can further reduce distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect.

[0060] Specifically, when the power of the optical module φ is negative, the sum of the powers of the first lens group 1 and the second lens group 2 is also negative (the power of the second lens group 2 is greater than the power of the first lens group 1), and the power of the optical module, the sum of the powers of the first lens group 1 and the second lens group 2 is limited within the range of 1.2<φ / (φ1+φ2)<1.5, which can reasonably allocate the powers of the first lens group 1, the second lens group 2 and the optical module, and in combination with -2.2<φ 正 / φ 负 <-1.9, which can further reduce distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect.

[0061] Or when the optical power of the optical module is positive, the sum of the optical power of the first lens group 1 and the optical power of the second lens group 2 is also positive (the optical power of the first lens group 1 is greater than the optical power of the second lens group 2), the optical power of the optical module, the sum of the optical power of the first lens group 1 and the optical power of the second lens group 2 is limited in the range of 1.2<φ / (φ1+φ2)<1.5, the optical power of the first lens group 1, the second lens group 2 and the optical module can be reasonably distributed, and combined with-2.2<φ 正 / φ 负 <-1.9, the distortion and chromatic aberration can be further reduced, clear imaging can be realized, and the optical imaging effect can be improved.

[0062] In one embodiment, the optical module satisfies: 1.5<φ 正 / φ1<1.8.

[0063] In this embodiment, the ratio of the sum of the optical power of the lens with positive optical power in the optical module to the optical power of the first lens group 1 is limited, which can reduce the imaging distortion and chromatic aberration of the optical module, realize clear imaging, and improve the optical imaging effect. For example, the optical module satisfies-2.2<φ 正 / φ 负 <-1.9, and 1.2<φ / (φ1+φ2)<1.5 and 1.5<φ 正 / φ1<1.8, the sum of the optical power of the lens with positive optical power in the optical module, the sum of the optical power of the lens with negative optical power, the optical power of the first lens group 1, and the optical power of the second lens group 2 and the optical power of the optical module are reasonably distributed, which can further reduce the distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect.

[0064] Specifically, since the optical power of the first lens group 1 is positive, most of the lenses with positive optical power in the optical module are located in the first lens group 1, or all the lenses with positive optical power are located in the first lens group 1. Therefore, in order to reduce the distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect, it is reasonable to limit the ratio of the sum of the optical power of the lens with positive optical power to the optical power of the first lens group 1.

[0065] In this embodiment, the sum of the optical power of the lens with positive optical power in the optical module is limited, and the sum of the optical power of the lens with positive optical power and the optical power of the first lens group 1 is reasonably distributed, which can reduce the imaging distortion and chromatic aberration of the optical module, realize clear imaging, and improve the optical imaging effect.

[0066] In one embodiment, the optical module satisfies: 2<φ 负 / φ2<8.

[0067] In this embodiment, the ratio of the sum of the optical powers of the lenses with negative optical power in the optical module to the optical power of the second lens group 2 is limited, which can reduce the imaging distortion and chromatic aberration of the optical module, realize clear imaging, and improve the optical imaging effect. For example, the optical module satisfies -2.2<φ 正 / φ 负 <-1.9, and 1.2<φ / (φ1+φ2)<1.5 and 2<φ 负 / φ2<8, the sum of the optical powers of the lenses with positive optical power in the optical module, the sum of the optical powers of the lenses with negative optical power, the optical power of the first lens group 1, and the optical power of the second lens group 2 and the optical power of the optical module are reasonably distributed, which can further reduce the distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect.

[0068] Specifically, since the optical power of the second lens group 2 is negative, most of the lenses with negative optical power in the optical module are located in the second lens group 2, or all the lenses with negative optical power are located in the second lens group 2. Therefore, in order to reduce the distortion and chromatic aberration, realize clear imaging, and improve the optical imaging effect, it is reasonable to limit the ratio of the sum of the optical powers of the lenses with negative optical power to the optical power of the second lens group 2.

[0069] In this embodiment, the sum of the optical powers of the lenses with negative optical power in the optical module is limited, and the sum of the optical powers of the lenses with negative optical power and the optical power of the second lens group 2 are reasonably distributed, which can reduce the imaging distortion and chromatic aberration of the optical module, realize clear imaging, and improve the optical imaging effect.

[0070] In one embodiment, the optical module satisfies: 1.4<φ 正 / φ<1.8.

[0071] In this embodiment, the ratio of the sum of the optical powers of the lenses with positive optical power to the optical power of the optical module is limited, which realizes reasonable distribution of the optical power of the lenses with positive optical power and the optical power of the optical module, can reduce the imaging distortion and chromatic aberration of the optical module, realize clear imaging, and improve the optical imaging effect.

[0072] Specifically, in the optical module, the ratio of the sum of the optical powers of the positive lenses to the optical power of the optical module is positive, and the ratio is greater than 1, that is, the optical power of the optical module is positive, and in the optical module, the sum of the optical powers of the positive lenses is greater than the optical power of the optical module. Therefore, in this embodiment, the optical power of the positive lenses and the optical power of the optical module are reasonably distributed, which can reduce the imaging distortion and chromatic aberration of the optical module, realize clear imaging, and improve the optical imaging effect.

[0073] In one embodiment, the optical module satisfies: -1<φ 负 / φ<-0.5.

[0074] In this embodiment, the ratio of the sum of the optical powers of the negative lenses to the optical power of the optical module is limited, which reasonably allocates the optical power of the negative lenses and the optical power of the optical module, reduces the imaging distortion and chromatic aberration of the optical module, realizes clear imaging, and improves the optical imaging effect.

[0075] Specifically, in the optical module, the ratio of the sum of the optical powers of the negative lenses to the optical power of the optical module is negative, and the ratio is less than 1, that is, the optical power of the optical module is positive, and in the optical module, the sum of the optical powers of the negative lenses is less than the optical power of the optical module. Therefore, in this embodiment, the optical power of the negative lenses and the optical power of the optical module are reasonably allocated, which reduces the imaging distortion and chromatic aberration of the optical module, realizes clear imaging, and improves the optical imaging effect.

[0076] In one embodiment, the effective focal length of the first lens group 1 is f1, and the effective focal length of the second lens group 2 is f2; the optical module satisfies: -10<f2 / f1<-3.

[0077] In this embodiment, the ratio of the effective focal length of the second lens group 2 to the effective focal length of the first lens group 1 is limited, which reasonably allocates the effective focal lengths of the first lens group 1 and the second lens group 2, reduces the imaging distortion and chromatic aberration of the optical module, realizes clear imaging, and improves the optical imaging effect.

[0078] Since the optical power of the first lens group 1 is positive, the effective focal length of the first lens group 1 is positive, and the optical power of the second lens group 2 is negative, so the effective focal length of the second lens group 2 is negative, and the absolute value of the effective focal length of the second lens group 2 is greater than the effective focal length of the first lens group 1. Under the condition of providing a suitable FOV, the optical module can meet the requirements of low distortion, low chromatic aberration, high definition, high reliability, etc.

[0079] In one embodiment, the effective focal length of the optical module is F, and the optical module satisfies: 0.8<f1 / F<1.2.

[0080] In this embodiment, the ratio of the effective focal length of the first lens group 1 to the effective focal length of the optical module system is limited, which reasonably allocates the effective focal lengths of the first lens group 1 and the optical module system, and under the condition of providing a suitable FOV, the optical module can meet the requirements of low distortion, low chromatic aberration, high definition, high reliability, etc.

[0081] In one embodiment, with reference to Figure 1 and Figure 5The first lens group 1 includes at least one lens with positive refractive power.

[0082] For example, the first lens group 1 can include one lens, or the first lens group 1 can include two lenses, or the first lens group 1 can include three lenses or the first lens group 1 can include more lenses. Regardless of whether the first lens group 1 includes one lens or more lenses, the first lens group 1 has positive refractive power, and the refractive power of the lenses in the first lens group 1 is reasonably limited so that the optical module meets the conditions defined in the above embodiments, so that the optical module has small imaging distortion and small chromatic aberration, and achieves the effect of clear imaging.

[0083] In a specific embodiment, referring to Figure 1 and Figure 5 , the first lens group 1 includes a third lens 12, a second lens 11 and a first lens 10 along the light transmission direction, and the refractive power of the third lens 12, the second lens 11 and the first lens 10 is in the order of positive, negative and positive.

[0084] In this embodiment, the first lens group 1 includes a first lens 10 with positive refractive power, a second lens 11 with negative refractive power and a third lens 12 with positive refractive power. The refractive power of each lens in the first lens group 1 is reasonably distributed, combined with the refractive power of the lenses in the second lens group 2, so that the optical module has small imaging distortion and small chromatic aberration, and achieves the effect of clear imaging.

[0085] It should be noted that the first lens group 1 can also include more lenses, for example, the first lens group 1 includes at least three lenses, as long as the refractive power of the first lens group 1 is positive, and the refractive power of the first lens group 1 meets the conditions defined in the above embodiments.

[0086] In an embodiment, referring to Figure 1 and Figure 5 , the second lens group 2 includes at least one lens with negative refractive power.

[0087] For example, the second lens group 2 can include one lens, or the second lens group 2 can include two lenses, or the second lens group 2 can include three lenses or the second lens group 2 can include more lenses. Regardless of whether the second lens group 2 includes one lens or more lenses, the second lens group 2 has positive refractive power, and the refractive power of the lenses in the second lens group 2 is reasonably limited so that the optical module meets the conditions defined in the above embodiments, so that the optical module has small imaging distortion and small chromatic aberration, and achieves the effect of clear imaging.

[0088] In a specific embodiment, referring to Figure 1 and Figure 5The second lens group 2 includes a fifth lens 22 and a fourth lens 21 in the light transmission direction, and the optical power of the fifth lens 22 and the fourth lens 21 is negative, negative, or negative, positive in sequence.

[0089] For example, referring to Figure 1 The optical power of the fifth lens 22 is negative, and the optical power of the fourth lens 21 is negative. The optical power of each lens in the second lens group 2 is reasonably distributed in combination with the optical power of the lens in the first lens group 1, so that the optical module has small imaging distortion and small chromatic aberration, and clear imaging effect is achieved.

[0090] For example, referring to Figure 5 The optical power of the fifth lens 22 is negative, and the optical power of the fourth lens 21 is positive. The optical power of each lens in the second lens group 2 is reasonably distributed in combination with the optical power of the lens in the first lens group 1, so that the optical module has small imaging distortion and small chromatic aberration, and clear imaging effect is achieved.

[0091] It should be noted that the first lens group 1 can also include more lenses, for example, the first lens group 1 includes at least two lenses, as long as the optical power of the second lens group 2 is negative, and the optical power of the second lens group 2 meets the conditions defined in the above embodiments.

[0092] The optical module provided in the embodiments of the present application is described below through two embodiments.

[0093] Embodiment 1

[0094] The present application provides an optical module, as shown in Figure 1 The optical module includes a first lens group 1 and a second lens group 2. The first lens group 1 includes a third lens 12, a second lens 11, and a first lens 10 in the light transmission direction. The second lens group 2 includes a fifth lens 22 and a fourth lens 21 in the light transmission direction. The first lens 10 is closest to the human eye 4, and the fifth lens 22 is closest to the display 3. In this embodiment, the lenses with refractive power in the optical module are limited to the above five lenses. Of course, the lenses with refractive power in the optical module can not be limited to the above five lenses. In alternative embodiments, the lenses with refractive power in the optical module can be two lenses, three lenses, four lenses, six lenses, or more.

[0095] The surface of the first lens 10 away from the second lens 11 is a convex surface, the surface of the first lens 10 close to the second lens 11 is a convex surface, and the optical power of the first lens 10 is positive; the surface of the second lens 11 close to the first lens 10 is a concave surface, the surface of the second lens 11 away from the first lens 10 is a plane, and the optical power of the second lens 11 is negative; the surface of the third lens 12 close to the second lens 11 is a plane, the surface of the third lens 12 away from the second lens 11 is a convex surface, and the optical power of the third lens 12 is positive.

[0096] The surface of the fourth lens 21 close to the third lens 12 is a convex surface, the surface of the fourth lens 21 away from the third lens 12 is a concave surface, and the optical power of the fourth lens 21 is negative; the surface of the fifth lens 22 close to the fourth lens 21 is a convex surface, the surface of the fifth lens 22 away from the fourth lens 21 is a concave surface, and the optical power of the fifth lens 22 is negative.

[0097] The optical power of the first lens group 1 composed of the first lens 10, the second lens 11 and the third lens 12 is positive, and the optical effective focal length f1 of the first lens group 1 is 17.30, wherein in the first lens group 1, the sum of the optical power of all the positive lenses φ 正 is 0.09832.

[0098] The optical power of the second lens group 2 composed of the fourth lens 21 and the fifth lens 22 is negative, and the optical effective focal length f2 of the second lens group 2 is -53.40. In the optical module, the sum of the optical power of all the negative lenses φ 负 is -0.05, that is, the sum of the optical power of the second lens 11, the fourth lens 21 and the fifth lens 22 is -0.05. The optical effective focal length F of the optical module is 17.68.

[0099] In the optical module provided by the embodiment 1, the optical parameters of the positions of the first lens 10, the second lens 11, the third lens 12, the fourth lens 21, the fifth lens 22 and the virtual image surface of the optical module (the surface of surface 0 in Table 1 is the surface of the virtual image surface), the position of the entrance pupil (the surface of surface 1 in Table 1 is the surface of the entrance pupil position) of the optical module and the flat glass between the entrance pupil position and the first lens 10 (the surfaces of surface 2 and surface 3 in Table 1 are the surfaces of the flat glass), and the flat glass on the display 3 (the surface of surface 14 in Table 1 is the surface of the flat glass) are as follows in Table 1 and Table 2.

[0100] Table 1

[0101]

[0102]

[0103] Table 2

[0104] Surface A4 A6 A8 A10 A12 A14 4 -2.8787E-06 3.1379E-07 -5.0577E-09 -1.1630E-10 -3.3596E-12 3.0462E-14 5 -6.5996E-05 -4.5760E-07 -2.1514E-09 -5.5188E-11 -2.0526E-13 2.5343E-15 6 5.7824E-05 -4.0872E-09 1.5729E-09 5.5424E-11 6.5669E-13 7.6717E-16 7 -5.7606E-05 1.0348E-07 -4.2969E-10 -4.8519E-11 -3.0313E-13 1.4433E-14 8 3.2791E-05 -1.1599E-06 -1.1207E-09 -6.0758E-11 -6.9914E-13 -1.7411E-14 9 1.6316E-06 4.7653E-07 3.9428E-09 3.1496E-11 1.6676E-13 -1.5628E-14 10 -1.8154E-05 -5.3047E-07 -8.0397E-09 5.4264E-11 2.2314E-12 2.6137E-14 11 2.2617E-04 2.4957E-06 3.6614E-08 -1.1657E-10 -1.0821E-11 0.0000E+00 12 1.0577E-04 -7.3941E-06 1.6939E-08 2.8988E-10 -1.1549E-11 0.0000E+00 13 4.3264E-04 -7.4282E-06 -2.1328E-07 -8.0181E-11 -1.0236E-13 0.0000E+00

[0105] Figure 2 is a schematic diagram of a point spread diagram provided by Embodiment 1 of the present application. The point spread diagram refers to a diffused pattern scattered in a certain range formed by a point emitting many light rays after passing through an optical module, due to aberration, so that the intersection points with the image plane are no longer concentrated at the same point, and the imaging quality of the optical module can be evaluated. As shown in Figure 2 , in Embodiment 1, the image points in the point spread diagram meet the requirements and form clear images.

[0106] Figure 3 is a distortion diagram provided by Embodiment 1 of the present application. The distortion diagram reflects the position difference of the clear image plane in different fields of view. In Embodiment 1, the maximum absolute value of the distortion is less than 5%.

[0107] Figure 4 is a schematic diagram of a sagittal chromatic aberration diagram provided by Embodiment 1 of the present application. The sagittal chromatic aberration refers to the magnification chromatic aberration, which mainly refers to a primary chromatic main light ray in the object side, which becomes multiple light rays when exiting the image side due to the dispersion of the refractive system. The difference in the focal point positions of the blue light and the red light on the image plane. As shown in Figure 4 , in Embodiment 1, the maximum chromatic aberration value of the optical module is less than 12 μm, and the maximum chromatic aberration value meets the requirements and forms clear images.

[0108] Embodiment 2

[0109] The present application provides an optical module, as shown in Figure 5 , the optical module comprises: a first lens group 1 and a second lens group 2, the first lens group 1 comprises a third lens 12, a second lens 11 and a first lens 10 along the light transmission direction, the second lens group 2 comprises a fifth lens 22 and a fourth lens 21 along the light transmission direction, wherein the first lens 10 is closest to the human eye 4, and the fifth lens 22 is closest to the display 3. In this embodiment, the lenses with refractive power in the optical module are limited to the above five lenses. Of course, the lenses with refractive power in the optical module can not be limited to the above five lenses. In alternative embodiments, the lenses with refractive power in the optical module can be two lenses, three lenses, four lenses, six lenses or more.

[0110] , wherein the surface of the first lens 10 away from the second lens 11 is a convex surface, the surface of the first lens 10 close to the second lens 11 is a convex surface, and the optical power of the first lens 10 is positive; the surface of the second lens 11 close to the first lens 10 is a concave surface, the surface of the second lens 11 away from the first lens 10 is a plane, and the optical power of the second lens 11 is negative; the surface of the third lens 12 close to the second lens 11 is a convex surface, the surface of the third lens 12 away from the second lens 11 is a convex surface, and the optical power of the third lens 12 is positive.

[0111] The surface of the fourth lens 21 close to the third lens 12 is convex, the surface of the fourth lens 21 far from the third lens 12 is concave, and the optical power of the fourth lens 21 is positive; the surface of the fifth lens 22 close to the fourth lens 21 is convex, the surface of the fifth lens 22 far from the fourth lens 21 is concave, and the optical power of the fifth lens 22 is negative.

[0112] The optical power of the first lens group 1 composed of the first lens 10, the second lens 11 and the third lens 12 is positive, the optical effective focal length f1 of the first lens group 1 is 16.06, the optical power of the second lens group 2 composed of the fourth lens 21 and the fifth lens 22 is negative, and the optical effective focal length f2 of the second lens group 2 is -152.21. The optical effective focal length F of the optical module is 13.868.

[0113] In the optical module, the sum of the optical powers of all the lenses with negative optical power is φ 负 -0.0513, i.e., the sum of the optical power of the second lens 11 and the optical power of the fifth lens 22 is -0.0513. In the optical module, the sum of the optical powers of all the lenses with positive optical power is φ 正 0.10866, i.e., the sum of the optical power of the first lens 10, the optical power of the third lens 12 and the optical power of the fourth lens 21 is 0.10866.

[0114] In the optical module provided in the embodiment 2, the optical parameters of the first lens 10, the second lens 11, the third lens 12, the fourth lens 21, the fifth lens 22, the position of the virtual image plane (the surface 0 in Table 3 represents the surface of the virtual image plane), the position of the entrance pupil (the surface 1 in Table 3 represents the surface of the entrance pupil) of the optical module, the flat glass between the entrance pupil position and the first lens 10 (the surfaces 2 and 3 in Table 3 represent the surfaces of the flat glass), and the flat glass on the display 3 (the surface 14 in Table 3 represents the surface of the flat glass) are specifically as follows in Table 3 and Table 4.

[0115] Table 3

[0116]

[0117]

[0118] Table 4

[0119] Surface A4 A6 A8 A10 A12 A14 4 -2.8787E-06 3.1379E-07 -5.0577E-09 -1.1630E-10 -3.3596E-12 3.0462E-14 5 -6.5996E-05 -4.5760E-07 -2.1514E-09 -5.5188E-11 -2.0526E-13 2.5343E-15 6 5.7824E-05 -4.0872E-09 1.5729E-09 5.5424E-11 6.5669E-13 7.6717E-16 7 -5.7606E-05 1.0348E-07 -4.2969E-10 -4.8519E-11 -3.0313E-13 1.4433E-14 8 3.2791E-05 -1.1599E-06 -1.1207E-09 -6.0758E-11 -6.9914E-13 -1.7411E-14 9 1.6316E-06 4.7653E-07 3.9428E-09 3.1496E-11 1.6676E-13 -1.5628E-14 10 -1.8154E-05 -5.3047E-07 -8.0397E-09 5.4264E-11 2.2314E-12 2.6137E-14 11 2.2617E-04 2.4957E-06 3.6614E-08 -1.1657E-10 -1.0821E-11 0.0000E+00 12 1.0577E-04 -7.3941E-06 1.6939E-08 2.8988E-10 -1.1549E-11 0.0000E+00 13 4.3264E-04 -7.4282E-06 -2.1328E-07 -8.0181E-11 -1.0236E-13 0.0000E+00

[0120] Figure 6is a schematic diagram of a point column provided by Embodiment 2 of the present application. The point column refers to many light rays emitted from a point, after passing through an optical module, the intersection points of the light rays with an image plane are no longer concentrated at the same point due to aberration, and a dispersion pattern is formed within a certain range, which can be used to evaluate the imaging quality of the optical module. As shown in Figure 6 , in Embodiment 2, the image points in the point column meet the requirements and are clearly imaged.

[0121] Figure 7 is a distortion chart provided by Embodiment 2 of the present application. The distortion chart reflects the position difference of the image plane of clear images in different fields of view. In Embodiment 2, the maximum absolute value of distortion is less than 5%.

[0122] Figure 8 is a schematic diagram of a distortion chart provided by Embodiment 2 of the present application. The distortion chart reflects the position difference of the image plane of clear images in different fields of view. In Embodiment 2, the maximum absolute value of distortion is less than 5%. Figure 8

[0123] According to another aspect of the embodiments of the present application, a head-mounted display device is also provided, which includes a housing and an optical module as described above. The head-mounted display device is, for example, a VR head-mounted device, including a VR glasses or a VR helmet, etc., and the embodiments of the present application do not make specific limitations thereto.

[0124] The specific implementation of the head-mounted display device of the embodiments of the present application can refer to the above-described display module embodiments, which will not be described here again.

[0125] The above embodiments mainly describe the differences between the various embodiments. The different optimization features between the various embodiments can be combined to form a more optimal embodiment as long as they are not contradictory. Considering the brevity of the writing, they will not be described here again.

[0126] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.​

Claims

1. An optical module characterized by comprising: The optical module comprises, in sequence along the light transmission direction: a second lens group (2) and a first lens group (1), the second lens group comprises, in sequence along the light transmission direction: a fifth lens (22) and a fourth lens (21), the first lens group comprises, in sequence along the light transmission direction: a third lens (12), a second lens (11) and a first lens (10), and the optical power of the fifth lens, the fourth lens, the third lens (12), the second lens (11) and the first lens (10) is in the order of: negative, negative, positive, negative and positive. The first lens group (1) has a positive power, the second lens group (2) has a negative power, the power of the second lens group (2) is φ2, and in the optical module, the sum of the powers of all positive lenses is φ 正 , and the sum of the powers of all negative lenses is φ 负 . The optical module satisfies: -2.2<φ 正 / φ 负 <-1.9, 2<φ 负 / φ2<8.

2. The optical module according to claim 1, wherein The optical power of the optical module is φ, the optical power of the first lens group (1) is φ1, and the optical power of the second lens group (2) is φ2. The optical module satisfies: 1.2<φ / (φ1+φ2)<1.

5.

3. The optical module according to claim 2, wherein The optical module satisfies: 1.5<φ 正 / φ1<1.

8.

4. The optical module according to claim 2, wherein The optical module satisfies: 1.4<φ 正 / φ<1.

8.

5. The optical module according to claim 2 or 3 or 4, characterized by, The optical module satisfies: -1<φ 负 / φ<-0.

5.

6. The optical module according to claim 1, wherein The effective focal length of the first lens group (1) is f1, and the effective focal length of the second lens group (2) is f2. The optical module satisfies: -10<f2 / f1<-3.

7. The optical module according to claim 6, wherein The effective focal length of the optical module is F, and the optical module satisfies: 0.8<f1 / F<1.

2.

8. A head-mounted display device, comprising: The head-mounted display device comprises: a housing, and the optical module according to any one of claims 1-7.

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