Wearable device

Abstract

The utility model relates to the technical field of projection, and provides a wearable device, which comprises a display main body and a belt body connected with the display main body, the projection module is installed on the display main body or the belt body, the projection module comprises a projection source, a refraction lens assembly and a reflector which are sequentially arranged along the optical axis, and the refraction lens assembly comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the optical axis and have positive diopters, positive diopters, negative diopters, positive diopters and positive diopters; the reflector is located on the amplification side of the refraction lens assembly. Wherein the field angle of the projection module is 27-74 degrees. By controlling the field angle of the projection module, the light emitted from the refraction lens assembly can be projected to the projection surface (such as the palm center or the palm back or the arm of a user) after being reflected by the reflection surface, projection in a small projection area region is realized, and the application scene and the projection effect of the wearable device are improved.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a wearable device. Background Art

[0002] Projection display technology can magnify and display image information using optical systems and projection space. The projection system is an optical imaging system that ultimately displays the image. Projectors are widely used in home, education, entertainment, and office applications. The projection lens greatly affects the application scenarios and imaging quality of the projection system. Related technologies such as office or home projectors have larger projection screens for projection. However, the position of a person's arm or palm is limited, which limits the area of ​​the projection area. Existing projection modules cannot be directly used for projection on small and convenient wearable devices. Utility Model Content

[0003] The present application provides a wearable device to solve the technical defect in the related art that projection cannot be achieved on a small wearable device.

[0004] A wearable device according to an embodiment of the present application includes:

[0005] A display body and a belt body connected to the display body;

[0006] A projection module is installed on the display body or the belt body, and the projection module includes a projection source, a refractive lens assembly and a reflector arranged in sequence along the optical axis. The refractive lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence along the optical axis and have refractive powers of positive, positive, negative, positive and positive respectively; the reflector is located on the magnification side of the refractive lens assembly; wherein, after being reflected by the reflector, the image light beam is suitable for imaging on the side of the projection source away from the refractive lens assembly, and the field of view angle of the projection module is 27°-74°.

[0007] According to the wearable device of the embodiment of the present application, it includes a display body and a belt connected to the display body; a projection module is installed on the display body or the belt, and the projection module includes a projection source, a refractive lens assembly and a reflector arranged in sequence along the optical axis, and the refractive lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis and having refractive powers of positive, positive, negative, positive and positive in sequence; the reflector is located on the magnification side of the refractive lens assembly; wherein the field of view of the projection module is 27°-74°. By controlling the field of view of the projection module, the light emitted from the refractive lens assembly can be projected onto the projection surface (such as the palm or back of the palm or arm of the user) after being reflected by the reflection surface, so as to realize projection in a smaller projection area, thereby improving the application scenarios and projection effects of the wearable device.

[0008] According to the wearable device of the embodiment of the present application, the projection ratio of the projection module is 0.36-0.38.

[0009] According to the wearable device of an embodiment of the present application, the reflector is an aspherical mirror, and the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical lenses;

[0010] A metal reflection layer is arranged on the reflection surface of the reflection mirror.

[0011] According to the wearable device of the embodiment of the present application, the belt body includes a first belt portion and a second belt portion, the first belt portion is connected to one end of the display body; the second belt portion is connected to the other end of the display body away from the first belt portion.

[0012] According to the wearable device of the embodiment of the present application, it also includes a first shell and a second shell, one side of the first shell is connected to the first belt portion, and the other side is provided with a first connecting portion; wherein the first shell is also provided with a accommodating cavity and a projection window connected to the accommodating cavity;

[0013] The second shell has one side connected to the second belt portion and the other side provided with a second connecting portion, the second connecting portion being configured to be releasably coupled to the first connecting portion and allowing both the first belt portion and the second belt portion to bend at the wrist of the wearer;

[0014] The projection module is located in the accommodating cavity, and the light of the projection module is configured to be transmitted through the projection window.

[0015] According to the wearable device of the embodiment of the present application, along the direction of the optical axis, the distance TTL from the projection source to the reflector is 8-10 mm;

[0016] and / or,

[0017] The ratio of the distance TTL from the projection source to the reflector to the distance L1 from the first lens to the reflector is TTL / L1=2-2.5.

[0018] According to the wearable device of an embodiment of the present application, the focal length range of the first lens, the second lens, the third lens and the fifth lens is between 2.5-3.5 mm, and the focal length range of the fourth lens is between 220-260 mm.

[0019] According to the wearable device of an embodiment of the present application, the curvature radius of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all between 2-20 mm;

[0020] and / or,

[0021] The effective radius of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all between 0.6-2.1 mm.

[0022] According to the wearable device of an embodiment of the present application, the edge thicknesses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all between 0.2-0.9 mm.

[0023] According to the wearable device of an embodiment of the present application, the upper end surface of the reflector and the outer side surface of the first lens are not on the same plane.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 The optical path of the optical system for the projection module provided by the present application is Figure 1 ;

[0027] Figure 2 The optical path of the optical system for the projection module provided by the present application is Figure 2 ;

[0028] Figure 3 The optical path of the optical system for the projection module provided by the present application is Figure 3 ;

[0029] Figure 4 The optical path of the optical system for the projection module provided by the present application is Figure 4 ;

[0030] Figure 5 A schematic structural diagram of a belt body according to an embodiment of the present application;

[0031] Figure 6 A schematic structural diagram of another embodiment of the belt body provided in the embodiment of the present application;

[0032] Figure 7 A schematic diagram of a distributed system of a projection module provided in an embodiment of the present application;

[0033] Figure 8A schematic diagram of an embodiment of the projection module provided in the embodiment of the present application and the belt portion of the wearable device being opened;

[0034] Fig. 9 A schematic diagram of an embodiment of the combination of a projection module and a wearable device provided in an embodiment of the present application;

[0035] Fig.10 A schematic diagram of another embodiment of the combination of a projection module and a wearable device provided in an embodiment of the present application;

[0036] Fig.11 A schematic diagram of an embodiment of a projection device provided in an embodiment of the present application projecting a scene on a wrist;

[0037] Fig.12 is a modulation function (MTF) diagram of the optical system provided by the embodiment of the present application at different field angles;

[0038] Fig.13 It is the astigmatism curve and distortion diagram of the optical system provided in the embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In the related technologies, projection display technology can magnify and display image information using optical systems and projection space. The projection system is an optical imaging system that ultimately displays the image. Projectors are widely used in home, education, entertainment, and office, etc. The projection lens greatly affects the application scenarios and imaging quality of the projection system. In the related technologies, office or home projectors have larger projection screens for projection. However, the position of a person's arm or palm is prioritized, which limits the area of ​​the projection area. Existing projection modules cannot be directly used for projection on small and convenient wearable devices.

[0041] On the basis of the above, combined with Figures 1 to 13 The present application provides a wearable device, which can solve the problem that the above-mentioned projection module cannot be directly applied to a small and convenient wearable device for projection.

[0042] See also Figure 1-Figure 11 As shown, according to an embodiment of the present application, the wearable device includes:

[0043] A display body 100 and a belt body 200 connected to the display body; a projection module 300, which is installed on the display body 100 or the belt body 200, and the projection module 300 includes a projection source 310, a refractive lens assembly 320 and a reflector 330 arranged in sequence along the optical axis, and the refractive lens assembly 320 includes a first lens 321, a second lens 322, a third lens 323, a fourth lens 324 and a fifth lens 325 which are arranged in sequence along the optical axis and have refractive powers of positive, positive, negative, positive and positive respectively; the reflector 310 is located on the magnification side of the refractive lens assembly 320; wherein, after the image light beam is reflected by the reflector 330, it is suitable for imaging on the side of the projection source 310 away from the refractive lens assembly 320, and the field of view angle of the projection module is 27°-74°.

[0044] It can be understood that in this embodiment, the projection source 310 is responsible for emitting light. For example, the projection source 310 can be a high-brightness LED or laser light source. The light emitted by the projection source 310 is focused and corrected by the subsequent refractive lens assembly 320, and finally projected onto the target position or target screen through the reflector 330.

[0045] The refractive lens assembly 320 is composed of five lenses, which are arranged from right to left in the figure as a first lens 321, a second lens 322, a third lens 323, a fourth lens 324 and a fifth lens 325, and the reflector 330 is located on the magnification side of the refractive lens assembly 320 and is arranged close to the first lens 321. The function of the reflector 330 is to reflect the light focused by the lens assembly to the target position or the target screen to form a final projection image.

[0046] In this embodiment, the refractive power of the first lens 321, the second lens 322, the fourth lens 324 and the fifth lens 325 are all positive, that is, they are all convex lenses, which have the ability to converge light. The refractive power of the third lens 323 is negative, that is, it is a concave lens, which has the function of diverging light. This combination of positive and negative lenses can effectively correct the distortion and chromatic aberration of light during propagation, and improve the clarity and color accuracy of the projected image.

[0047] According to the wearable device of the embodiment of the present application, it includes a display body 100 and a belt body 200 connected to the display body 100; a projection module 300 is installed on the display body 100 or the belt body 200, and the projection module 300 includes a projection source 310, a refractive lens assembly 320 and a reflector 330 arranged in sequence along the optical axis, and the refractive lens assembly 320 includes a first lens 321, a second lens 322, a third lens 323, a fourth lens 324 and a fifth lens 325 arranged in sequence along the optical axis and having a refractive power of positive, positive, negative, positive and positive in sequence; the reflector 330 is located on the magnification side of the refractive lens assembly 320; wherein the field of view of the projection module 300 is 27°-74°. By controlling the field of view of the projection module 300, the light emitted from the refractive lens assembly 320 can be projected onto the projection surface (for example, the palm or back of the palm or arm of the user) after being reflected by the reflection surface, so as to realize projection in a smaller projection area, thereby improving the application scenario and projection effect of the wearable device. After being reflected by the reflector 330 , the image beam is suitable for being imaged on a side of the projection source 310 away from the refractive lens assembly 320 , so as to be conveniently projected on the palm or back of the hand of the user.

[0048] Exemplarily, the projection module 300 may include a projection source 310 and an optical system, wherein the optical system includes the above-mentioned refractive lens assembly 320 and reflector 330 .

[0049] In an optional embodiment, the effective focal length range of the refractive lens assembly 320 is set between 1.6-2.2 mm, and the final total length of the lens is only 8-10 mm, which ensures that the projection module 300 has sufficient magnification and projection distance, and makes the entire module compact and easy to carry and install.

[0050] In this embodiment, the distance TTL (i.e., the total length of the lens) from the projection source 310 to the reflector 330 is 8-10 mm. For example, in a specific implementation, the distance TTL from the projection source 310 to the reflector 330 is 9.1 mm. The structure of the optical system is very compact and occupies little space.

[0051] It can be understood that in the optical system of the projection module 300 of this embodiment, the light emitted from the projection source 310 first passes through the refractive lens assembly 320, and after five refractions, forms a focused light beam, and then the light beam is reflected by the reflector 330, and finally projected onto the target screen to form an image. Through the cooperation of the refractive lens assembly 320 and the reflector 330, only five lenses are needed to realize the refraction and focusing process of the light from the projection source 310 to the projection surface, which greatly reduces the number of lenses. At the same time, the effective focal length range of the refractive lens assembly 320 is 1.6-2.2mm, which is an ultra-short focus lens. The smaller focal length makes the light focus or diverge faster inside the lens, thereby reducing the size of the lens. The total length of the lens is only 8-10mm, which is conducive to the miniaturization and lightweight of the lens module.

[0052] In an alternative embodiment, reference Figure 4 As shown, the distance from the projection surface to the reflection surface is 10-30 mm. For example, the projection effect is best when the distance from the projection surface to the reflection surface is 18 mm.

[0053] Specifically, the modulation function and distortion diagram of the projection module 300 at different viewing angles can be referred to Fig.12 and Fig.13 As shown in the figure, it can be seen that under different field angles and in the range of spatial frequency of 0mm-50mm, the image value can always be maintained above 0.5. Generally speaking, the closer the value is to 1, the higher the image quality is. However, due to the influence of various factors, there is no case where the modulus value is 1. Generally, when the modulus value can be maintained above 0.5, it means that the image has a higher imaging quality and the picture clarity is better. Therefore, it can be seen that the ultra-short focus projection module of this embodiment has a higher imaging quality. Fig.13 The left picture is the astigmatism curve, and the right picture is the distortion graph. Fig.13 It can be seen that the degree of astigmatism and distortion under the above different field of view angles are within the expected range.

[0054] According to an embodiment of the present application, the reflective surface of the reflector 330 is an aspherical or free-form reflective surface, and the light emitted from the refractive lens assembly 320 is irradiated on the reflective surface of the concave reflector, and is reflected by the reflective surface of the concave reflector to the projection surface (such as the user's palm, palm or arm), thereby realizing a convenient projection experience anytime and anywhere. This projection method is not only convenient for users to watch, but also avoids the problem of finding a suitable projection screen in the traditional projection method.

[0055] In this embodiment, the reflecting surface of the reflector 330 is a non-spherical surface or a free-form surface, which can reduce aberrations and improve the display effect of the projection image. Compared with the traditional spherical reflector, the non-spherical or free-form surface reflector 330 can more effectively correct and compensate for the aberrations generated during the propagation of light, making the projection image clearer and more accurate.

[0056] In an optional embodiment, a metal reflective layer (not shown) is provided on the reflective surface of the reflector 330. The metal reflective layer can ensure the reflection efficiency and also has a good heat dissipation effect. In particular, materials such as silver and aluminum have very high reflectivity in the visible light and near-infrared bands. When light hits the metal reflective layer, most of the light will be reflected instead of being absorbed or scattered. The metal reflective layer can effectively conduct the heat absorbed by the reflector to other parts, thereby helping the reflector to maintain a low temperature, which is conducive to preventing the reflector from being deformed or damaged due to overheating.

[0057] Specifically, the metal reflective layer may be formed by coating silver, aluminum, or aluminum-magnesium alloy on the reflective surface, which is not specifically limited in this embodiment.

[0058] According to one embodiment of the present application, it also includes a first shell 10 and a second shell 30, one side of the first shell 10 is connected to the first band portion 20, and the other side is provided with a first connecting portion 13; wherein the first shell 10 is also provided with a accommodating cavity 14 and a projection window 12 connected to the accommodating cavity 14; one side of the second shell 30 is connected to the second band portion 22, and the other side is provided with a second connecting portion 33, the second connecting portion 33 is configured to be releasably engaged to the first connecting portion 13, and allows the first band portion 20 and the second band portion 22 to be bent at the wrist of the wearer; the optical system for the projection module is located in the accommodating cavity 14, and the light of the optical system for the projection module is configured to pass through the projection window 15.

[0059] It can be understood that, in the present embodiment, a first shell 10 is further included, wherein a first side 11 of the first shell 10 is configured to allow connection with the first belt portion 20, and a second side 12 of the first shell 10 away from the first side 11 is provided with a first connection portion 13; a second side 32 of the second shell 30 away from the first side 31 of the second shell 30 is provided with a second connection portion 33, and the second connection portion 33 is configured to releasably engage with the first connection portion 13, wherein the first shell 10 is also provided with an accommodating cavity 14 and a projection window 15 connected to the accommodating cavity 14.

[0060] The second shell 30, the first side 31 of the second shell 30 is configured to allow connection with the second belt portion 22. It can be understood that the connection described above and below includes direct connection and indirect connection, which may include snap-on, fixed connection with fasteners, bonding, etc. A second connection portion 33 is provided on a second side 32 of the second shell 30 opposite to the first side 31 of the second shell 30. The second connection portion 33 is configured to releasably engage the first connection portion 13 and allow the first band portion 20 and the second band portion 22 to bend at the wrist of the wearer, wherein the first band portion 20 and the second band portion 22 are not a whole section that is completely connected as one, but two sections located on both sides of the main body 80 of the wearable device (described in the embodiments below). The first band portion 20 can be one of the band portions of the wearable device, such as the left band portion, and the second band portion 22 can be one of the other band portions of the wearable device, such as the right band portion. The wearable device can be a watch, a bracelet, etc. The first band portion 20 and the second band portion 22 can be bent to form a roughly ring-shaped structure and buckled on the wrist or neck of the user, etc., to ensure that the entire projection device can be engaged with various types of wearable band devices; so that the projection device can be compatible with various types of wearable band devices to achieve projection, and allow the first band portion 20 and the second band portion 22 to be bent at the wrist 60 of the wearer. The first band portion 20 and the second band portion 22 are bent to form a roughly ring-shaped structure, such as Figure 8-10 The first shell 10 , the second shell 30 , the first belt portion 20 and the second belt portion 22 can ensure that the entire projection module 300 is releasably coupled to various types of belt-mounted wearable devices, and the belt portion can be adapted in length as required to be compatible with wrists 60 of different sizes.

[0061] The projection module 300 is located in the accommodating cavity 14. The projection module 300 can be located in the accommodating cavity 14 as a whole, or a part of the projection module 300 (such as the optical module part) can leak out relative to the accommodating cavity 14; the light of the projection module 300 is configured to be transmitted through the projection window 15, and the projection window 15 can be a light-transmissive structure or a hole or opening structure on the first shell 10, wherein the optical axis direction A of the projection module 300 and the connecting line direction B from the first shell 10 to the second shell 30 are set at an angle α. It can be understood that the optical axis direction A can be the light emitting direction of the center of the projection module 300, and the connecting line direction B from the first shell 10 to the second shell 30 can be the connecting line direction between the center of the first shell 10 and the center of the second shell 30, so as to obtain a projection module 300 having a projection module 300 and a projection module 30 having a projection module 300. Figure 5 For example, in the XYZ space coordinate system, the direction B may be the X-axis direction, and the optical axis direction A may be the Z-direction. In some application scenarios, the first belt portion 20 and the second belt portion 22 may include an unfolded state and a bent state. In the fully unfolded state, the first belt portion 20 and the second belt portion 22, the first shell 10 and the second shell 30 may be, for example, Figure 5 or Figure 6The coaxial line arrangement in the embodiment can obtain an included angle α of 60°, 80°, 85°, 90° and the like.

[0062] In some application scenarios, the existing projection module 300 can be integrated into the display body 100 of the wearable device.

[0063] In other embodiments, considering that the integration of the projection module 300 and the related circuits into the display main body 100 requires the change of the electrical and mechanical connections of the original electrical components, the development cost is high, resulting in a larger volume and heavier weight of the display main body 100, and the battery life is also affected accordingly, and it is not compatible with the existing wearable device. By setting the angle α between the optical axis direction A and the connection direction B from the first shell 10 to the second shell 30, it is ensured that the projection module 300 can be installed on the belt body 200 of the wearable device instead of the display main body 100, and when the projection module 300 is worn on the wrist 60 of the wearer, the projection window 15 can be projected onto the palm 62, the back of the palm or the arm where the wrist 60 is located, and will not affect the function and use of the original wearable device. Therefore, the projection module 300 of the embodiment of the present application can be compatible with the rapid combination and disassembly of various types of belt wearable devices, which is convenient for realizing flexible projection in different areas of various existing wearable devices, effectively improving the application scenario of the projection device, and allowing ordinary wearable devices to have intelligent projection functions.

[0064] In some embodiments, in conjunction with Figure 5-11 The first side 11 and the second side 12 of the first shell 10 may be opposite sides of the same axis, the first side 31 and the second side 32 of the second shell 30 may be opposite sides of the same axis, the projection window 15 is located between the first side 11 and the second side 12 of the first shell 10, and the first shell 10 is configured to allow rotation to the side of the wearer's wrist 60 facing the palm 62, and the light of the projection module 300 is used to form an image on the wearer's palm 62. It can be understood that the projection window 15 can be located on the side of the first shell 10, for example Figure 5 In the Y direction of the plane where the XY is located, that is, in the thickness direction of the first shell 10, the surface of the wrist 60 away from the palm 62 is often used as the main display surface of the wearable device (such as the display body of a watch). Rotating the projection window 15 to the side of the wearer's wrist 60 facing the palm 62 can facilitate the wearer to see the projection content without interfering with the main display surface. Figure 7 1 is an example of an outline 151 of the projected content.

[0065] In some embodiments, see Figure 5-11The first shell 10 includes a top surface 101, a back surface 102, a first side surface 103 and a second side surface 104, the first side surface 103 and the second side surface 104 are respectively connected to the top surface 101 and the back surface 102, the first side surface 103 and the second side surface 104 are arranged opposite to each other, the top surface 101 and the back surface 102 are arranged opposite to each other, the first side 11 and the second side 12 of the first shell 10 can be other sides different from the top surface 101, the back surface 102, the first side surface 103 and the second side surface 104; the top surface 101, the back surface 102, the first side surface 103 and the second side surface 104 can be one or a combination of planes and curved surfaces, the back surface 102 is configured to contact the wrist 60 of the wearer, and the top surface 101 is away from the wrist 60 of the wearer, and the projection window 15 is located on the first side surface 103 so that the light of the projection module 300 is imaged on the palm 62 of the wearer. In other embodiments, the light of the projection module 300 can also be imaged on the back of the wearer's palm. It can be understood that the top surface 101 and the back surface 102 can be XZ-shaped reference surfaces or corresponding parallel reference surfaces, and the first side surface 103 and the second side surface 104 can be XY-shaped reference surfaces or corresponding parallel reference surfaces. In other embodiments, the top surface 101, the back surface 102, the first side surface 103 and the second side surface 104 may not be planes, but one or a combination of continuous curved surfaces. In this case, the XZ and XY-shaped reference surfaces can be surfaces that are tangent to a certain point of the above-mentioned curved surfaces. The XYZ space coordinate system in the figure is only a simple example for convenient description of the positional relationship of the various surfaces, and does not strictly limit the various surfaces of the present application to standard cubes or rectangular parallelepiped structures surrounded by planes. In fact, the various surfaces of the first shell 10 may include a combination of continuous or discontinuous curved surfaces and planes.

[0066] In some embodiments, the top surface 101 and the back surface 102 include curved surfaces that can fit the wrist 60 of the wearer; wherein the distance between the top surface 101 and the back surface 102 does not exceed 20 mm, for example, 20 mm, 18 mm, 15 mm, 12 mm or 10 mm, that is, the thickness of the first shell 10 ( Figure 5 In some scenarios, such as when the user is typing in the office, if the thickness here is too thick, it is easy to cause an impact on the user's wrist 60 when typing on the desktop. In the prior art, many projection devices are often large in size after being combined with wearable devices, and are not compatible with the normal use of the original wearable devices. The thickness parameter design of the first shell 10 is conducive to reducing the discomfort caused by the overall thickness of the projection module 300 in the wearable device, ensuring that the user maintains the normal use of the original wearable device in various scenarios. The projection window 15 is located on the first side 103, and even if the top surface 101 is attached to the desktop during use, it will not cause wear on the projection module 300.

[0067] In some embodiments, the projection module 300 may further include a third shell 50, one side of the third shell 50 is configured to be detachably connected to the first side 11 of the first shell 10, and the other side of the third shell 50 is configured to allow connection with the first belt portion 20. It can be understood that the third shell 50 is first connected to the first belt portion 20, and then the third shell 50 is connected to the first shell 10. The above connection can be, for example, snap-fitting or bonding, etc., which is conducive to reducing the structural complexity of the first shell 10 and reducing the production cost of the first shell 10. At the same time, the electrical components of the first shell 10 can be designed and then assembled with the third shell 50, while minimizing the mold opening or design cost. At the same time, the assembly efficiency of the entire component is improved. In some embodiments, the third shell 50 and the first shell 10 have the same shape, which can ensure the consistency of the appearance, further reduce the mold opening cost, and maintain the overall beauty. Among them, the length of the first shell 10 can be greater than the length of the second shell 30 and the third shell 50, so that the relevant components of the projection device 40 can be effectively integrated into the first shell 10, which is convenient for the division of labor in design and manufacturing.

[0068] In some embodiments, the first connection portion 13 and the second connection portion 33 include mutually attracted magnetic parts; for example, the first connection portion 13 and the second connection portion 33 are different magnets, or one is a magnet and the other is an attractable metal.

[0069] In some embodiments, the first connection portion 13 and the second connection portion 33 include protrusions and grooves that are engaged with each other. For example, the first connection portion 13 includes a protrusion, and the second connection portion 33 includes a groove, and the two are engaged with each other. Of course, the order of the two can also be interchanged to achieve engagement. In some embodiments, the length of the first belt portion 20 can extend into the groove of the second connection portion 33 and be engaged by the protrusion of the first connection portion 13.

[0070] In some embodiments, in conjunction with Figure 5-11 The projection module 300 may further include a locking member 35, which is movably connected to the first housing 10 and / or the second housing 30. For example, the locking member 35 is movably connected to the first housing 10 and leaks out relative to the top surface 101, or may be located at the first side surface 103 or the second side surface 104, or the locking member 35 is movably connected to the second housing 30 and leaks out relative to the housing 30. The locking member 35 is configured to allow the first connection portion 13 and the second connection portion 33 to remain fixed in the first position, and to allow the first connection portion 13 and the second connection portion 33 to be separated in the second position. The user can quickly operate the locking member 35 as needed to achieve rapid fixing or separation of the first connection portion 13 and the second connection portion 33.

[0071] In some embodiments, in conjunction with Figure 8-10The first shell 10, the second shell 30 and / or the third shell 50 have a curved surface on one side facing the wearer's wrist 60; the first shell 10 and the third shell 50 are symmetrically designed relative to the projection window 15, which is conducive to ensuring that the overall projection module 300 is more beautiful and the weight distribution is more even, wherein the surfaces of the first shell 10, the second shell 30 and the third shell 50 transition smoothly in sequence, that is, there are no obvious steps, making the whole more beautiful.

[0072] In some embodiments, in conjunction with Figure 7, further comprising a microdisplay 41 and an optical module 42, the optical module 42 being located at the light-emitting side of the microdisplay 41, and the microdisplay 41 being able to be Micro-LED (Micro Light-Emitting Diode), uLED (Micro Light Emitting Diode), Micro-oled (Micro Organic Light-Emitting Diode), LCoS (Liquid Crystal On Silicon), LCD (Liquid Crystal Display), DMD (Digital Micromirror Device) / DLP (Digital Light Processing) or LBS (Laser Beam Scanning), etc., or any combination of these technologies. The microdisplay 41 can provide an image source, such as text, video, information prompts, and the like. The projection window 15 is provided with an optical protection sheet 152, which is located on the light-emitting side of the optical module 42. The projection device further includes a control circuit 70, a battery 71, a communication unit 76 and at least one vital sign sensor 74 located in the first housing 10. The control circuit 70 is electrically connected to the micro display 41, the battery 71, the communication unit 76 and at least one vital sign sensor 74. The vital sign sensor 74 may include a blood sugar sensor, an electromyographic sensor, an electrocutaneous sensor, a heart rate sensor, a pulse sensor, etc. Among them, at least one sensor 74 faces the wearer and is configured to detect the wearer's vital signs, for example, located on the wearer's wrist 60 to detect the wearer's pulse, heart rate, blood oxygen, blood pressure, etc. In other embodiments, the sensor 74 may also include an inertia sensor, a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, etc. The communication unit 76 may be, for example, Bluetooth, 2.4G or WiFi, etc. The battery 71 may be, for example, a lithium battery or a replaceable battery, etc. The above design enables the projection module 300 to realize the functions of communication and intelligent monitoring of vital signs, which is conducive to combining with ordinary mechanical watches, etc., so that non-intelligent watches also have the functions of smart watches. It can be understood that the projection module 300 may also include, for example, an interface module 73 and an interaction module 75. The interface module 73 may be, for example, an electrical interface or a data transmission interface such as TYPC-C, USB, or a metal contact. The interaction module 75 may be, for example, a key, a voltage or a capacitive touch sensor interaction to realize the command operation of the projection module 300.

[0073] The wearable device may include a display body 100; the display body 100 may be, for example, a watch dial, a display screen of a bracelet, etc.; the first band portion 20 is connected to one end of the display body 100, for example, it may be rotatably connected via a rotating shaft 222; the second band portion 22 is connected to the other end of the display body 100, for example, it may be rotatably connected via a rotating shaft 222; it can be understood that the first band portion 20 and the second band portion 22 are located on both sides of the display body 100, and the projection module 300 is arranged between the first band portion 20 and the second band portion 22, thereby realizing the connection of the first band portion 20 and the second band portion 22 into a ring-shaped whole. For the structure, function and working principle of the projection module 300, please refer to the description of the above-mentioned embodiment, which will not be repeated here.

[0074] According to one embodiment of the present application, referring to Figure 1-Figure 4 As shown, the focal lengths of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325 are in the range of 2.5-3.5 mm, and the focal length of the fourth lens 324 is in the range of 30-260 mm.

[0075] In a specific embodiment, the focal length of the first lens 321 is 3.12 mm, the focal length of the second lens 322 is 2.97 mm, the focal length of the third lens 323 is 9.24 mm, the focal length of the fourth lens 324 is 247 mm, and the focal length of the fifth lens 325 is 2.63 mm. When the light from the projection source 310 passes through these lenses, they will be refracted according to the designed refractive power and focal length, thereby changing the direction of the light and focusing it, and then projecting the image after being reflected by the reflector 330.

[0076] According to one embodiment of the present application, the ratio of the distance TTL from the projection source 310 to the reflector 330 to the distance L1 from the first lens 321 to the reflector 330 is TTL / L1=2-2.5, so that the clarity, brightness, size and field of view of the projected image meet the requirements.

[0077] According to an embodiment of the present application, a ratio of a distance T2 from the projection source 310 to the first lens 321 to a distance T1 from the first lens 321 to the reflector 330 is T2 / T1=1-1.5.

[0078] It can be understood that, in this embodiment, the ratio of T2 to T1 is designed to be 1-1.5, and the positions of the projection source 310, the refractive lens assembly and the reflector 330 are reasonably arranged. This ratio range ensures that the light of the projection source 310 can be effectively transmitted and focused through the refractive lens assembly, while allowing the reflector 330 to be located at a suitable position so as to reflect the light onto a predetermined projection surface. At the same time, the projection source 310, the refractive lens assembly and the reflector 330 are arranged more compactly, thereby realizing a compact optical system layout and helping to reduce the space occupied.

[0079] For example, in an optional specific embodiment, the distance T2 from the projection source 310 to the first lens 321 is 4.9 mm, and the distance T1 from the first lens 321 to the reflector 330 is 4.1 mm. In this case, T2 / T1=1.18, which helps to optimize the imaging quality while maintaining the compactness of the optical system.

[0080] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the refractive system also includes an aperture 326, which is disposed between the first lens 321 and the second lens 322. It can be understood that, in this embodiment, the aperture 326 is on the same optical axis as the other lenses and the reflector 330, and can be used to limit the amount of light passing through the cover optical system.

[0081] Specifically, the aperture 326 may be disposed in the middle of the first lens 321 and the second lens 322 . In an optional implementation, the air gap between the aperture 326 and the first lens 321 is 0.1 mm.

[0082] According to one embodiment of the present application, the Abbe number of the fourth lens 324 is 50-60, and the Abbe numbers of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325 are all 20-25; and / or, the refractive index of the fourth lens 324 is smaller than the refractive indexes of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325, the refractive index of the fourth lens 324 is between 1.51-1.60, and the refractive indexes of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325 are between 1.61-1.8.

[0083] It can be understood that, in this embodiment, the Abbe number of the fourth lens 324 is designed to be greater than the Abbe numbers of other lenses. This design is to optimize the dispersion performance of the optical system. The higher Abbe number makes the fourth lens 324 more capable of suppressing dispersion, that is, the refractive index changes less at different wavelengths, which is beneficial to reducing image blur and color distortion caused by dispersion. At the same time, although the Abbe numbers of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325 are relatively low, they also play their respective roles in the entire optical system. They work together with the fourth lens 324 to achieve optimization of the entire optical system through reasonable layout and combination, and significantly improve the performance of the optical system without increasing the complexity and cost of the system.

[0084] For example, in a specific implementation, the Abbe number of the fourth lens 324 is 56, and the Abbe numbers of the first lens 321 , the second lens 322 , the third lens 323 and the fifth lens 325 are all 21.5.

[0085] In an optional embodiment, the refractive index of the fourth lens 324 is designed to be smaller than the refractive indexes of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325. The lower refractive index means that the focusing ability of the fourth lens 324 on light is relatively weak, but it helps to reduce dispersion and improve imaging quality. In addition, the use of a material with a lower refractive index for the fourth lens 324 can also reduce cost and weight and simplify the manufacturing process. Exemplarily, the material of the fourth lens 324 is K26R, while the material of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325 is EP7000.

[0086] In a specific embodiment, the refractive index of the fourth lens 324 is 1.565, and the refractive index of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325 is 1.651. The refractive index is used to indicate the degree of refraction of light by the lens. When the refractive index is larger, the degree of refraction is larger. Therefore, the splitting effect of the image beam is larger during the imaging process of the first lens 321, the second lens 322, the third lens 323 and the fifth lens 325. The Abbe number is used to indicate the degree of dispersion of light by the lens medium. The lower the Abbe number, the greater the dispersion, and thus the greater the refractive index.

[0087] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 are all aspherical lenses, and the absolute values ​​of the curvature radii of the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 are all between 2-20 mm.

[0088] It can be understood that in the present embodiment, the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 all use aspheric lenses in order to optimize the imaging quality. Compared with the traditional spherical lenses, the aspheric lenses can more accurately control the propagation and focusing of light, thereby reducing optical problems such as aberrations and distortions, and improving the clarity and contrast of the image, which is crucial for the optical system of the projection module 300 because it directly affects the quality of the projected image.

[0089] Secondly, the absolute values ​​of the radii of curvature of the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 are all between 2-20 mm. A smaller radius of curvature can achieve a more compact optical system and reduce the overall size and weight. However, a too small radius of curvature may also increase the difficulty of processing and increase the cost. On the other hand, although a larger radius of curvature is easy to process, it may make the optical system too large and bulky. Therefore, the range of 2-20 mm radius of curvature is a relatively balanced choice, which takes into account both optical performance and processing cost and system size.

[0090] In a specific embodiment, the curvature radius of the fourth lens 324 is greater than the curvature radius of other lenses, so that the focal length of the fourth lens 324 is longer, which can reduce the aberration and distortion of the lens. The larger curvature radius can also improve the transmittance and optical performance of the lens. Transmittance is the ability of the lens to allow light to pass through, while optical performance includes parameters such as resolution and contrast. A larger curvature radius can reduce reflection and scattering on the lens surface, increase the transmittance of light, and thus improve the optical performance of the lens.

[0091] In this embodiment, the radius of curvature of each lens can be matched with its corresponding parameters such as aperture and focal length to achieve optimal optical energy absorption and imaging quality. For example, the aperture of the fifth lens 325 and the fourth lens 324 is larger than that of other lenses, and more light can be collected, thereby improving the brightness and clarity of the image. The aperture of other lenses is smaller, which is conducive to reducing the occupied volume and weight of the optical system.

[0092] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the edge thicknesses of the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 are all between 0.2-0.9 mm; and / or, the effective radius of the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 is between 0.6-2.1 mm.

[0093] It can be understood that, in an optional embodiment, the edge thicknesses of the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 are all between 0.2-0.9 mm. The thinner edge thickness can reduce the total weight and volume of the lens, which is very important for realizing a compact optical system. Selecting the range of 0.2-0.9 mm can ensure sufficient mechanical strength and stability while maintaining the compactness of the lens.

[0094] For example, in a specific implementation, the edge thickness of the fifth lens 325 is 0.74 mm, the edge thickness of the fourth lens 324 is 0.3 mm, and the edge thickness of the third lens 323 is 0.90 mm.

[0095] In an optional specific embodiment, the air gap between the fifth lens 325 and the projection source 310 is 0.32 mm, the center thickness of the fifth lens 325 is 1.10 mm, the air gap between the fifth lens 325 and the fourth lens 324 is 0.15 mm, the center thickness of the fourth lens 324 is 0.9 mm, the air gap between the fourth lens 324 and the third lens 323 is 0.14 mm, the center thickness of the third lens 323 is 0.71 mm, the air gap between the third lens 323 and the second lens 322 is 0.1 mm, the center thickness of the second lens 322 is 0.5 mm, the air gap between the second lens 322 and the first lens 321 is 0.2 mm, and the center thickness of the first lens 321 is 0.48 mm, so that the first lens 321, the second lens 322, the third lens 323, the fourth lens 324 and the fifth lens 325 are arranged compactly to minimize the occupied space.

[0096] In another optional implementation, the effective radius of the first lens 321 , the second lens 322 , the third lens 323 , the fourth lens 324 and the fifth lens 325 is between 0.6 mm and 2.1 mm.

[0097] The effective radius in this embodiment is the maximum effective radius. The effective radius is a key parameter that determines the field of view that the lens can cover and the lens's ability to collect light, and directly affects the field of view of the lens. A larger effective radius can provide a wider field of view, allowing the lens to collect more light, thereby increasing the brightness and clarity of the image, and an appropriate effective radius can ensure that the lens has lower aberrations and distortions during the imaging process, thereby improving the image quality.

[0098] In this embodiment, the effective radius of the lens is designed to be between 0.6-2.1 mm, which can control the size, weight and cost of the lens and reduce the manufacturing difficulty while ensuring that the lens has a sufficient field of view and good optical performance.

[0099] In a specific implementation, the effective radius of the lens close to the projection source 310 is larger, for example, the effective radius of the fifth lens 325 is larger than the effective radius of other lenses.

[0100] According to one embodiment of the present application, referring to Figure 1 and Figure 2As shown, the first lens 321, the second lens 322 and the fifth lens 325 are biconvex lenses, the third lens 323 is a biconcave lens, and the fourth lens 324 is a plano-convex lens.

[0101] In this embodiment, the first lens 321, the second lens 322 and the fifth lens 325 are biconvex lenses, both sides of which are convex, with positive optical power, which can converge light and bend the light toward the axis of the lens after passing through the lens. In the optical system, the first lens 321, the second lens 322 and the fifth lens 325 are used to provide the main focusing ability to focus the light. The third lens 323 is a biconcave lens, both sides of which are concave, with negative optical power, so that the light diverges away from the axis of the lens after passing through the third lens 323, and is used to correct the optical power of the system. The fourth lens 324 is a plano-convex lens, which can be used to fine-tune the system performance without affecting the main focusing ability.

[0102] By combining these different types of lenses, complex optical systems can be implemented to meet specific imaging needs. For example, a combination of biconvex and biconcave lenses can adjust the focal length and optical power of the system, while a plano-convex lens can fine-tune the system performance to achieve the best imaging effect.

[0103] According to one embodiment of the present application, the projection ratio of the optical system used for the projection module 300 is 0.36-0.38.

[0104] It is understandable that in this embodiment, the projection ratio of the optical system used for the projection module 300 is designed to be between 0.36 and 0.38, wherein the projection ratio refers to the ratio of the distance between the projection lens and the projection screen to the width of the projection image. The smaller the projection ratio, the closer the projection lens or projection device is to the projection screen, or the larger the size of the projected image. The projection ratio of this optical system is between 0.36 and 0.38, so that the optical system can project a larger image at a very short distance, which is convenient for the optical system to be applied to wearable devices such as bracelets or watches, so that the image can be projected onto the back of the user's hand, palm or arm, which is convenient for users to use and improves the user experience.

[0105] Specifically, in one embodiment, the present application also provides specific parameters of a reflector 330, a projection source 310, and each lens, as shown in Table 1 below:

[0106] Table 1-Specific parameters of each component of the optical system

[0107]

[0108] In some embodiments, reference Figure 1-Figure 4As shown, the upper end surface of the reflector 330 is not on the same plane as the outer side surface of the first lens 321. Specifically, the projection of the upper end of the reflector 33 on the optical axis is located on the side of the first lens 321 away from the projection source 310, so as to avoid that the light may be blocked by the end of the reflector 330 during the reflection process, resulting in dark areas or missing parts in the projected image, thereby maintaining the integrity and clarity of the projected image.

[0109] In some implementations, the present application further provides a projection method, which is applied to the projection device described in the above embodiment, and the method includes:

[0110] S11: Acquire first posture information of the wrist where the projection device is located.

[0111] Among them, the first posture information can be, for example, a posture parameter detected by a sensor of the projection device in the initial wearing state, such as the position rotation angle or direction of the wrist. For example, the first posture information can be reflected as the palm 62 of the user's wrist 60 facing downward (towards the ground), and the wearer's eyes cannot directly view the palm 62.

[0112] S12: Acquire second posture information based on the change of the first posture information.

[0113] The projection device is controlled to perform projection based on the second posture information. The second posture information is different from the first posture information, that is, as long as the wrist 60 moves, such as the position rotation angle or direction of the wrist changes, that is, the wrist is turned or shaken, the second posture information different from the first posture information is obtained, for example, the wrist position changes, that is, it can be reflected that the palm 62 of the user's wrist 60 is facing upward (away from the ground), and the user's eyes can just see the palm 62. The first posture information or the second posture information can be detected by an inertia measurement sensor, etc.

[0114] S13: Controlling the projection device to perform projection according to the first posture information and the second posture information.

[0115] It can be understood that when the comparison between the first posture information and the second posture information reaches a preset value, for example, the rotation angle, speed or direction of the wrist reaches a preset value, the projection device is controlled to perform projection. The data source of the projection can come from smart terminals such as mobile phones, computers, and smart glasses, or from the display body 100 of the wearable device, that is, the content of the dial, so that elderly people with poor eyesight can also see the content on their watches. In other embodiments, the data source of the projection can also come from the server side.

[0116] The present application can realize projection control by detecting the change information of the first posture information and the second posture information, which greatly simplifies the user's interactive operation logic and improves the user's projection interaction efficiency and experience.

[0117] In some embodiments, before step S11, the method may also include: establishing a first connection between the projection module 300 and an electronic device, the electronic device may be such as a mobile phone, a computer, smart glasses, a watch, a bracelet, etc., the first connection may be wired or wireless, and the wireless connection may be, for example, Bluetooth, 2.4g, 5g or wifi, etc., to ensure that the projection module 300 has established a stable data transmission channel.

[0118] In other embodiments, step S13 may further include: S131: obtaining whether the palm 62 corresponding to the wearer's wrist 60 where the projection module 300 is located is unfolded, and if so, controlling the projection module 300 to project on the palm 62. It can be understood that by simultaneously detecting the posture change of the wrist and whether the palm is unfolded to control the projection display, it is possible to reduce erroneous operations caused by posture changes, and projection is performed when the palm is unfolded, which is conducive to improving the user's interactive operation and facilitating the user to actively perform projection display when needed.

[0119] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0120] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0121] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0122] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0123] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wearable device, characterized in that: include: A display body (100) and a belt body (200) connected to the display body (100); A projection module (300) is mounted on the display body (100) or the belt body (200), wherein the projection module (300) comprises a projection source (310), a refractive lens assembly (320) and a reflector (330) which are sequentially arranged along an optical axis, wherein the refractive lens assembly (320) comprises a first lens (321), a second lens (322), a third lens (323), a fourth lens (324) and a fifth lens (325) which are sequentially arranged along the optical axis and whose refractive powers are positive, positive, negative, positive and positive respectively; the reflector (330) is located on the magnification side of the refractive lens assembly (320); wherein, after being reflected by the reflector (330), an image beam is suitable for being imaged on a side of the projection source (310) away from the refractive lens assembly (320), and a field of view angle of the projection module (300) is 27°-74°.

2. The wearable device according to claim 1, characterized in that: The projection ratio of the projection module (300) is 0.36-0.

38.

3. The wearable device according to claim 1, characterized in that: The reflecting mirror (330) is an aspherical mirror, and the first lens (321), the second lens (322), the third lens (323), the fourth lens (324) and the fifth lens (325) are all aspherical lenses; A metal reflection layer is provided on the reflection surface of the reflection mirror (330).

4. The wearable device according to claim 1, characterized in that: The belt body (200) comprises a first belt portion (210) and a second belt portion (220), wherein the first belt portion (210) is connected to one end of the display body (100); and the second belt portion (220) is connected to the other end of the display body (100) away from the first belt portion (210).

5. The wearable device according to claim 4, characterized in that: It also comprises a first shell (10) and a second shell (30), wherein one side of the first shell (10) is connected to the first belt portion (210), and the other side is provided with a first connecting portion (13); wherein the first shell (10) is further provided with a receiving cavity (14) and a projection window (15) communicating with the receiving cavity (14); One side of the second shell (30) is connected to the second belt portion (220), and the other side is provided with a second connecting portion (33), wherein the second connecting portion (33) is configured to be releasably coupled to the first connecting portion (13) and allow the first belt portion (210) and the second belt portion (220) to be bent at the wrist of the wearer; The projection module (300) is located in the accommodating cavity (14), and the light of the projection module (300) is configured to be transmitted through the projection window (15).

6. The wearable device according to claim 1, characterized in that: Along the direction of the optical axis, the distance TTL from the projection source (310) to the reflector (330) is 8-10 mm; and / or, The ratio of the distance TTL from the projection source (310) to the reflector (330) to the distance L1 from the first lens (321) to the reflector (330) is TTL / L1=2-2.

5.

7. The wearable device according to claim 1, characterized in that: The focal lengths of the first lens (321), the second lens (322), the third lens (323) and the fifth lens (325) are in the range of 2.5-3.5 mm, and the focal length of the fourth lens (324) is in the range of 220-260 mm.

8. The wearable device according to claim 1, characterized in that: The curvature radii of the first lens (321), the second lens (322), the third lens (323), the fourth lens (324) and the fifth lens (325) are all between 2 and 20 mm; and / or, The effective radii of the first lens (321), the second lens (322), the third lens (323), the fourth lens (324) and the fifth lens (325) are all between 0.6 and 2.1 mm.

9. The wearable device according to any one of claims 1 to 8, characterized in that: The edge thicknesses of the first lens (321), the second lens (322), the third lens (323), the fourth lens (324) and the fifth lens (325) are all between 0.2 mm and 0.9 mm.

10. The wearable device according to any one of claims 1 to 8, characterized in that: The upper end surface of the reflector (330) and the outer side surface of the first lens (321) are not on the same plane.

Images