Stylus, electronic device

Abstract

The application provides a stylus and an electronic device. It relates to the technical field of electronic device accessories. The stylus comprises a pen shell, a light emitting device, a photoelectric detector, a first light reflection structure and a second light reflection structure arranged in the pen shell; the photoelectric detector is arranged on the light path of the light emitting device; the first light reflection structure is located on the light path of the light emitting device, and the first light reflection structure is used for reflecting light from the light emitting device; the second light reflection structure is located on the light path of the reflected light of the first light reflection structure, and the second light reflection structure is used for reflecting light from the first light reflection structure. The photoelectric detector is arranged on the light path of the light emitting device, for example, the light emitting device and the photoelectric detector can be arranged along the length dimension of the pen shell, a light emitting device with a large light emitting area can be selected, and a photoelectric detector with a large light sensitive area can be selected, so that the emission power of the light emitting device and the sensitivity of the photoelectric detector are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic device accessories, in particular to a stylus and an electronic device comprising the stylus. BACKGROUND

[0002] With the development of electronic technology, more and more electronic terminals are equipped with some auxiliary devices. For example, a stylus, as a common input device, can realize the function of inputting graphics and text to an electronic terminal.

[0003] In some existing styluses, the arrangement of the light source and the photodetector occupies a large space, which limits the size of the light source and the photodetector. As a result, the emission power of the light source is low, and the detection sensitivity of the photodetector is low. For example, when the stylus takes color, it will result in low color taking signal-to-noise ratio and poor color taking accuracy. SUMMARY

[0004] The present application provides a stylus and an electronic device comprising the stylus. The purpose is to provide a stylus with high light source emission power and high photodetector sensitivity.

[0005] To achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, the present application provides a stylus. For example, the stylus can take color, or can take text, or can also take patterns.

[0007] The stylus comprises a pen shell, a light emitting device, a photodetector, a first light reflection structure and a second light reflection structure arranged in the pen shell; the photodetector is arranged on the light path of the light emitting device; the first light reflection structure is located on the light path of the light emitting device, and the first light reflection structure is used for reflecting light from the light emitting device; the second light reflection structure is located on the light path of the reflected light of the first light reflection structure, and the second light reflection structure is used for reflecting light from the first light reflection structure, for example, the reflected light of the second light reflection structure can be projected onto a target object.

[0008] Since the photodetector is arranged on the light path of the light emitting device, part of the light emitted by the light emitting device is blocked by the photodetector. However, by arranging the first light reflection structure and the second light reflection structure, the amount of light signal emitted to the target object can be ensured. For example, the first light reflection structure reflects the light from the light emitting device to the second light reflection structure, and the second light reflection structure reflects the light from the first light reflection structure to the target object. That is, the light blocked by the photodetector can be projected onto the target object through the matched first light reflection structure and the second light reflection structure, so as to ensure the amount of light signal emitted to the target object and ensure the coupling efficiency of the light source.

[0009] The light emitting device is used for emitting a light signal to a target object outside the pen shell, and the photoelectric detector is used for sensing the light reflected from the target object. The photoelectric detector of the application is arranged on the light path of the light emitting device, and can be regarded as that the photoelectric detector and the light emitting device are arranged along the longitudinal direction. In some related technologies, the photoelectric detector and the light emitting device are arranged side by side, and can be regarded as that the photoelectric detector and the light emitting device are arranged along the transverse direction. In some scenarios, in the case that the transverse dimension is limited, the longitudinal arrangement scheme of the application can be used to select a light emitting device with a larger light emitting area and a photoelectric detector with a larger light sensitive area, so as to improve the emission power of the light emitting device and the sensitivity of the photoelectric detector.

[0010] In an implementable manner, the light emitting device and the photoelectric detector are arranged along the length direction of the pen shell; the first light reflection structure is arranged on the side of the photoelectric detector facing the light emitting device; and the second light reflection structure is arranged between the light emitting device and the first light reflection structure.

[0011] In this example, since the light emitting device and the photoelectric detector are arranged along the length direction of the pen shell, compared with the case that the light emitting device and the photoelectric detector are arranged along the radial dimension of the pen shell, not only the emission power of the light emitting device and the sensitivity of the photoelectric detector can be improved, but also the radial dimension of the pen shell can be effectively reduced, which is beneficial to the miniaturization design of the stylus.

[0012] In this implementation structure, the first light reflection structure is arranged on the side of the photoelectric detector facing the light emitting device, so that the light projected onto the photoelectric detector can be reflected by the first light reflection structure and reflected onto the second light reflection structure, thereby improving the amount of light signals emitted to the target object.

[0013] In addition, in this example, the second light reflection structure is arranged between the light emitting device and the first light reflection structure, so that more light reflected by the first light reflection structure can be projected onto the second light reflection structure, thereby improving the light coupling efficiency between the first light reflection structure and the second light reflection structure.

[0014] In an implementable manner, the second light reflection structure is formed with a light passing hole, and the light of the light emitting device can pass through the light passing hole and be projected onto the first light reflection structure; and the part of the second light reflection structure located at the outer periphery of the light passing hole forms a reflection part, and the reflection part is used for reflecting the reflected light from the first light reflection structure.

[0015] In an implementable manner, the second light reflection structure includes a mirror, and the light passing hole is arranged on the mirror, and the mirror is provided with the light passing hole at the position opposite to the light emitting device.

[0016] By means of the implementation manner that the light passing hole is arranged on the mirror, not only the structure is simple, but also the assembly is convenient.

[0017] In an implementation, the second light reflection structure comprises a plurality of mirrors, the plurality of mirrors are arranged along a circumference direction and enclose the light passing hole.

[0018] In an implementation, the plurality of mirrors have coaxial optical axes; or, the plurality of mirrors have coincident focal points.

[0019] In this way, the light coupling efficiency of the light emitting device can be improved.

[0020] In an implementation, the first light reflection structure is symmetrical about the optical axis of the light emitting device; or, the reflection part is symmetrical about the optical axis of the light emitting device.

[0021] In this way, the amount of light signal emitted to the target object can be improved, and the light coupling efficiency can be improved.

[0022] In an implementation, the optical axis of the first light reflection structure passes through the center of the light emitting surface of the light emitting device, and the light emitting region of the light emitting device is located in the light passing hole.

[0023] In an implementation, the focal point of the first light reflection structure coincides with the focal point of the second light reflection structure.

[0024] In this way, the amount of light signal emitted to the target object can be improved, and the light coupling efficiency can be improved.

[0025] In an implementation, the first light reflection structure comprises a first reflection surface, the first reflection surface is configured to reflect light from the light emitting device to the second light reflection structure; and the first reflection surface is a convex surface.

[0026] For example, the first reflection surface can be a hyperboloid or a spherical surface.

[0027] The convex first reflection surface can reflect more light to the second light reflection structure.

[0028] In an implementation, the second light reflection structure comprises a second reflection surface, the second reflection surface is configured to reflect light from the first light reflection structure; and the second reflection surface is a concave surface.

[0029] For example, the second reflection surface can be a parabolic surface, a hyperboloid, an elliptical surface or a spherical surface.

[0030] The concave second reflection surface can reflect more light to the target object.

[0031] In an implementable manner, the first light reflection structure or the second light reflection structure comprises a substrate and a reflective film stacked on the substrate.

[0032] The light reflection structure has a simple structure and a simple manufacturing process, and is easy to implement.

[0033] In an implementable manner, the reflective film comprises a metal film stacked on the substrate.

[0034] The metal film can be used in a wide wavelength range to meet the use requirements of the stylus.

[0035] In an implementable manner, the reflective film comprises a metal film and a dielectric film, the metal film is stacked on the substrate, and the dielectric film is stacked on a side of the metal film away from the substrate.

[0036] The metal film is softer than the dielectric film, and the dielectric film can be used as a protective structure of the metal film to improve the use stability of the stylus.

[0037] In an implementable manner, the reflective film comprises a plurality of dielectric films stacked on the substrate, and the refractive indexes of adjacent two dielectric films are different.

[0038] The reflective film comprises a plurality of stacked dielectric films, and the use of the plurality of dielectric films with different refractive indexes can improve the reflectivity of the light reflection structure and reduce absorption loss.

[0039] In an implementable manner, the stylus further comprises a diffusion member arranged on a light path of the reflected light of the second light reflection structure.

[0040] The diffusion member can function as a light uniformizer to make more light project onto the target object.

[0041] In an implementable manner, the second light reflection structure has a first wavelength reflection surface and a second wavelength reflection surface, the first wavelength reflection surface is located on a light path of the light-emitting device, the first wavelength reflection surface is used for reflecting light with a first wavelength of the light-emitting device and transmitting light with a second wavelength, the first light reflection structure receives the light with the second wavelength and reflects the light with the second wavelength to the second wavelength reflection surface, and the first wavelength is different from the second wavelength.

[0042] In an implementable manner, the light emitted by the light-emitting device is polychromatic light.

[0043] In an implementable manner, the pen shell comprises a light-transmitting region; and the light-transmitting region is an arc-shaped structure protruding towards the outside of the pen shell.

[0044] In this way, the pen shell can be used as a pen cap to simplify the structure of the stylus.

[0045] In an implementable manner, the reflecting surface of the second light reflecting structure is a concave surface, and the concave surface is configured to reflect the light from the first light reflecting structure to the arc-shaped structure, and the light emitted from the arc-shaped structure is parallel light.

[0046] The concave reflecting surface of the second light reflecting structure cooperates with the arc-shaped structure of the light-transmitting region of the pen shell, so that the light emitted from the light-transmitting region is parallel light, and more light is projected onto the target object.

[0047] In a second aspect, the application provides a stylus tail, which is used for being mounted on a pen body, and includes a shell having a connecting portion configured to be detachably connected with the pen body; the stylus tail further includes a light emitting device, a photodetector, a first light reflecting structure and a second light reflecting structure located in the shell.

[0048] The photodetector is arranged on the light path of the light emitting device, and the light emitting device and the photodetector are arranged along the length direction of the stylus tail; the first light reflecting structure is arranged on the light path of the light emitting device, and is configured to reflect the light from the light emitting device; and the second light reflecting structure is arranged on the light path of the reflected light of the first light reflecting structure, and is configured to reflect the light from the first light reflecting structure.

[0049] The stylus tail provided by the application can be detachably mounted on a stylus. In the stylus tail, the photodetector is arranged on the light path of the light emitting device, for example, the light emitting device and the photodetector can be arranged along the length direction of the stylus tail. Compared with the arrangement of the light emitting device and the photodetector along the radial direction of the stylus tail, the application can select a light emitting device with a larger light emitting area and a photodetector with a larger light sensing area, thereby improving the emission power of the light emitting device and the sensitivity of the photodetector; and the radial dimension of the stylus tail can be effectively reduced, which is conducive to the miniaturization design of the stylus.

[0050] In an implementable manner, the first light reflecting structure of the stylus tail is arranged on the side of the photodetector facing the light emitting device; and the second light reflecting structure is arranged between the light emitting device and the first light reflecting structure.

[0051] In the implementation structure, the first light reflecting structure is arranged on the side of the photodetector facing the light emitting device, so that the light projected onto the photodetector can be reflected by the first light reflecting structure and reflected onto the second light reflecting structure, thereby improving the amount of light signals emitted to the target object.

[0052] In addition, in this example, the second light reflecting structure is arranged between the light emitting device and the first light reflecting structure, so that more light reflected by the first light reflecting structure is projected onto the second light reflecting structure, thereby improving the light coupling efficiency between the first light reflecting structure and the second light reflecting structure.

[0053] In an implementable manner, the second light reflection structure is provided with a light passing hole, and light of the light emitting device can pass through the light passing hole to project to the first light reflection structure; a part of the second light reflection structure located at the periphery of the light passing hole forms a reflection part, and the reflection part is used for reflecting the reflected light from the first light reflection structure.

[0054] In an implementable manner, the second light reflection structure comprises a mirror, and the light passing hole is arranged on the mirror, and the light passing hole is arranged at a position of the mirror used for being opposite to the light emitting device.

[0055] In an implementable manner, the first light reflection structure is symmetrical about the optical axis of the light emitting device; or, the reflection part is symmetrical about the optical axis of the light emitting device.

[0056] Since the first light reflection structure is symmetrical about the optical axis of the light emitting device, or the reflection part is symmetrical about the optical axis of the light emitting device, the amount of light signals emitted to the target object can be improved, and the light coupling efficiency can be improved.

[0057] In an implementable manner, the optical axis of the first light reflection structure passes through the center of the light emitting surface of the light emitting device, and the light emitting area of the light emitting device is located in the light passing hole.

[0058] In an implementable manner, the focal point of the first light reflection structure and the focal point of the second light reflection structure coincide.

[0059] The light emitting device is arranged at the optical axis of the first light reflection structure, the light emitting area of the light emitting device is located in the light passing hole, or the first light reflection structure and the second light reflection structure are arranged in a confocal manner, so that the amount of light signals emitted to the target object can be improved, and the light source coupling efficiency can be improved.

[0060] In a third aspect, the present application provides a touch pen, which can take color, or can take text, or can also take a pattern.

[0061] The touch pen comprises a pen shell, a light emitting device, a photodetector, a third light reflection structure and a fourth light reflection structure arranged in the pen shell; the light emitting device is arranged on one side of the light sensitive surface of the photodetector; the third light reflection structure is located on the light path of the light reflected by the target object, and is used for reflecting the light from the target object; the fourth light reflection structure is located on the light path of the reflected light of the third light reflection structure, and is used for reflecting the light from the third light reflection structure to the photodetector; the light emitting device is arranged on the side of the fourth light reflection structure away from the photodetector, and the light emitting device and the fourth light reflection structure are oppositely arranged.

[0062] In the present application, since the light emitting device is arranged on the light receiving surface side of the photodetector, the light emitting device will block part of the light from the target object from entering the photodetector. However, the present application can ensure the amount of light signals entering the photodetector by arranging the third light reflecting structure and the fourth light reflecting structure. For example, the third light reflecting structure reflects the light from the target object to the fourth light reflecting structure, and the fourth light reflecting structure reflects the light from the third light reflecting structure to the photodetector. That is, the light blocked by the light emitting device can be projected to the photodetector through the matched third light reflecting structure and fourth light reflecting structure, so as to ensure the amount of light signals entering the photodetector.

[0063] In the present application, the light emitting device is arranged on the light receiving surface side of the photodetector, which can be understood as the light emitting device being arranged on the light path of the photodetector. The photodetector and the light emitting device can be arranged along the longitudinal direction. In some related technologies, the photodetector and the light emitting device are arranged side by side, which can be understood as the photodetector and the light emitting device being arranged along the transverse direction. In some scenarios, the transverse dimension is limited. In this case, the longitudinal arrangement scheme of the present application can be used to select a light emitting device with a larger light emitting area and a photodetector with a larger light receiving area, so as to improve the emission power of the light emitting device and the sensitivity of the photodetector.

[0064] In an implementable manner, the light emitting device and the photodetector are arranged along the length direction of the pen shell; the third light reflecting structure is arranged on the light receiving surface side of the photodetector; and the fourth light reflecting structure is arranged between the light emitting device and the third light reflecting structure.

[0065] In this way, the light reflected by the target object can be projected onto the third light reflecting structure and then reflected onto the fourth light reflecting structure, so as to improve the amount of light signals projected to the photodetector.

[0066] In the example, since the light emitting device and the photodetector are arranged along the length direction of the pen shell, compared with the light emitting device and the photodetector being arranged along the radial dimension of the pen shell, the emission power of the light emitting device and the sensitivity of the photodetector can be improved, and the radial dimension of the pen shell can be effectively reduced, which is conducive to the miniaturization design of the stylus.

[0067] In an implementable manner, the third light reflecting structure is formed with a light passing hole, and the reflected light from the fourth light reflecting structure can pass through the light passing hole and be projected onto the photodetector; and a part of the third light reflecting structure located at the outer periphery of the light passing hole forms a reflecting part, and the reflecting part is used for reflecting the light from the target object.

[0068] In an implementation, the third light reflection structure comprises a mirror, and the light passing hole is arranged on the mirror.

[0069] The implementation of arranging the light passing hole on the mirror not only has a simple structure, but also is convenient for assembly.

[0070] In an implementation, the third light reflection structure comprises a third reflection surface, and the third reflection surface is configured to reflect light from the target object; the third reflection surface is a concave surface.

[0071] For example, the third reflection surface can be a parabolic surface, a hyperboloid surface, an elliptical surface or a spherical surface.

[0072] The concave third reflection surface can reflect more light to the fourth light reflection structure.

[0073] In an implementation, the fourth light reflection structure comprises a fourth reflection surface, and the fourth reflection surface is configured to reflect light from the third light reflection structure; the fourth reflection surface is a convex surface.

[0074] For example, the fourth reflection surface can be a hyperboloid surface or a spherical surface.

[0075] The convex fourth reflection surface can reflect more light to the photodetector.

[0076] In an implementation, a focal point of the third light reflection structure coincides with a focal point of the fourth light reflection structure.

[0077] In an implementation, an optical axis of the fourth light reflection structure passes through a center of a light receiving surface of the photodetector, and a light reflection region of the fourth light reflection structure is located in the light passing hole.

[0078] The photodetector is arranged at the optical axis of the fourth light reflection structure, the light reflection region of the fourth light reflection structure is located in the light passing hole, or the third light reflection structure and the fourth light reflection structure are arranged in a confocal manner, which can increase the amount of light signals projected to the photodetector and improve the sensitivity of the photodetector.

[0079] In an implementation, the third light reflection structure is symmetrical about an optical axis of the photodetector; or the reflection part is symmetrical about the optical axis of the photodetector.

[0080] In this way, the amount of light signals received by the photodetector can be increased, and the light coupling efficiency can be improved.

[0081] In an implementation, the third light reflection structure or the fourth light reflection structure comprises a substrate and a reflection film, and the reflection film is stacked on the substrate.

[0082] The light reflection structure has simple structure and can be used in a wide wavelength range, and meets the use requirement of the stylus.

[0083] In an implementable manner, the reflection film comprises a metal film stacked on the substrate.

[0084] In an example, the reflection film can comprise a stacked metal film and a dielectric film, the metal film is stacked on the substrate, and the dielectric film is stacked on a side of the metal film away from the substrate.

[0085] The metal film is softer than the dielectric film, and the dielectric film can be used as a protective structure of the metal film.

[0086] In an example, the reflection film comprises a plurality of stacked dielectric films, and the plurality of dielectric films with different refractive indexes can improve the reflectivity of the light reflection structure and reduce absorption loss.

[0087] In an implementable manner, the stylus further comprises a diffusion member, and the diffusion member is arranged on the light path of the light emitting device.

[0088] The diffusion member can play a role of light homogenization, so that more light is projected onto the target object.

[0089] In an implementable manner, the pen shell comprises a light-transmitting region, and the light-transmitting region is an arc-shaped structure protruding towards the outside of the pen shell.

[0090] In this way, the pen shell can be used as a pen cap, and the structure of the stylus is simplified.

[0091] In an implementable manner, the reflecting surface of the third light reflection structure is a concave surface, and the concave surface is used to reflect light from the arc-shaped structure to the fourth light reflection structure.

[0092] In a fourth aspect, the application provides a stylus tail, which is used for being mounted on a pen body, and comprises a shell having a connecting part used for being detachably connected with the pen body; the stylus tail further comprises a light emitting device, a photodetector, a third light reflection structure and a fourth light reflection structure located in the shell.

[0093] The light emitting device is arranged on a light-receiving surface side of the photodetector, the light emitting device is arranged on a light path of the photodetector, and the light emitting device and the photodetector are arranged along a length direction of the stylus tail; the third light reflection structure is located on a light path of light reflected by a target object, and is used for reflecting light from the target object; the fourth light reflection structure is located on a light path of reflected light of the third light reflection structure, and is used for reflecting light from the third light reflection structure to the photodetector.

[0094] The stylus tail provided in the application can be detachably installed on the stylus. In the stylus tail, the light emitting device is arranged on the light path of the photoelectric detector. For example, the light emitting device and the photoelectric detector can be arranged along the length dimension of the stylus tail. Compared with the arrangement of the light emitting device and the photoelectric detector along the radial dimension of the stylus tail, the application can select a light emitting device with a larger light emitting area and a photoelectric detector with a larger light sensing area, so as to improve the emission power of the light emitting device and the sensitivity of the photoelectric detector. In addition, the radial dimension of the stylus tail can be effectively reduced, which is beneficial to the miniaturization design of the stylus.

[0095] In an implementable manner, the third light reflection structure is arranged on the light sensing surface side of the photoelectric detector; and the fourth light reflection structure is arranged between the light emitting device and the third light reflection structure.

[0096] In this way, the light reflected by the target object can be projected onto the third light reflection structure and then reflected onto the fourth light reflection structure, so as to improve the amount of light signals projected to the photoelectric detector.

[0097] In an implementable manner, the third light reflection structure is formed with a light passing hole, and the reflected light from the fourth light reflection structure can pass through the light passing hole and be projected onto the photoelectric detector; and the part of the third light reflection structure located at the outer periphery of the light passing hole forms a reflection part, and the reflection part is used for reflecting the light from the target object.

[0098] In an implementable manner, the third light reflection structure includes a mirror, and the light passing hole is arranged on the mirror.

[0099] In a fifth aspect, the application provides an electronic device, which includes a terminal body and the stylus in the above-mentioned implementation manners, and the terminal body includes a display screen.

[0100] In the electronic device provided in the application, since the stylus in the above-mentioned implementation manners is included, the stylus can be used as an auxiliary device of the electronic device, for example, to realize the function of inputting graphics and texts to the electronic terminal. The light emitting device and the photoelectric detector of the stylus are arranged in a vertical arrangement manner, i.e., arranged along the length direction of the stylus. In this way, a light emitting device with a larger light emitting area and a photoelectric detector with a larger light sensing area can be selected, so as to improve the emission power of the light emitting device and the detection sensitivity of the photoelectric detector, and improve the performance of inputting graphics and texts.

[0101] In a sixth aspect, the application provides a detection device, which can be arranged in the stylus for color picking by a user, or arranged in a wearable device for detecting physiological parameters, such as heart rate.

[0102] The detection device comprises a light emitting device, a photoelectric detector, a first light reflection structure and a second light reflection structure; the photoelectric detector is arranged on the light path of the light emitting device; the first light reflection structure is located on the light path of the light emitting device, and the first light reflection structure is used for reflecting light from the light emitting device; the second light reflection structure is located on the light path of the reflected light of the first light reflection structure, and the second light reflection structure is used for reflecting light from the first light reflection structure; or, the light emitting device is arranged on the side of the photosensitive surface of the photoelectric detector, and the light emitting device is arranged on the light path of the photoelectric detector; the first light reflection structure is located on the light path of the reflected light of the target object, and the first light reflection structure is used for reflecting light from the target object; the second light reflection structure is located on the light path of the reflected light of the first light reflection structure, and the second light reflection structure is used for reflecting light from the first light reflection structure to the photoelectric detector.

[0103] In the detection device provided in the application, the photoelectric detector is arranged on the light path of the light emitting device, or the light emitting device is arranged on the side of the photosensitive surface of the photoelectric detector, which means that the photoelectric detector is arranged in a stacked manner along the light path direction. In this way, a light emitting device with a large light emitting area and a photoelectric detector with a large photosensitive area can be selected, so that the emission power of the light emitting device and the detection sensitivity of the photoelectric detector can be improved, and the detection performance of the detection device can be improved.

[0104] In an implementable manner, the photoelectric detector is arranged on the light path of the light emitting device, and the first light reflection structure is arranged on the side of the photoelectric detector facing the light emitting device; the second light reflection structure is arranged between the light emitting device and the first light reflection structure; the second light reflection structure is formed with a light passing hole, and the light of the light emitting device can pass through the light passing hole to project onto the first light reflection structure; the part of the second light reflection structure located at the outer periphery of the light passing hole forms a reflection part, and the reflection part is used for reflecting the reflected light from the first light reflection structure.

[0105] In an implementable manner, the second light reflection structure comprises a mirror, and the light passing hole is arranged on the mirror.

[0106] In an implementable manner, the light emitting device is arranged on the side of the photosensitive surface of the photoelectric detector, and the first light reflection structure is arranged on the side of the photosensitive surface of the photoelectric detector; the second light reflection structure is arranged between the light emitting device and the first light reflection structure; the first light reflection structure is formed with a light passing hole, and the reflected light from the second light reflection structure can pass through the light passing hole to project onto the photoelectric detector; the part of the first light reflection structure located at the outer periphery of the light passing hole forms a reflection part, and the reflection part is used for reflecting the light from the target object. BRIEF DESCRIPTION OF DRAWINGS

[0107] Figure 1 A structure schematic diagram of a touch pen is provided for the embodiments of the application.

[0108] Figure 2 A structure diagram of a tail of a stylus according to an embodiment of the present application;

[0109] Figure 3 A structure diagram of a second light reflection structure according to an embodiment of the present application;

[0110] Figure 4 A structure diagram of a second light reflection structure according to an embodiment of the present application;

[0111] Figure 5 A structure diagram of a first light reflection structure or a second light reflection structure according to an embodiment of the present application;

[0112] Figure 6 A structure diagram of a first light reflection structure or a second light reflection structure according to an embodiment of the present application;

[0113] Figure 7 A structure diagram of a first light reflection structure or a second light reflection structure according to an embodiment of the present application;

[0114] Figure 8 A structure diagram of a first light reflection structure, a second light reflection structure and a light emitting device according to an embodiment of the present application;

[0115] Figure 9 A structure diagram of a first light reflection structure and a second light reflection structure according to an embodiment of the present application;

[0116] Figure 10 A structure diagram of a first light reflection structure, a second light reflection structure and a light emitting device according to an embodiment of the present application;

[0117] Figure 11 A structure diagram of a tail of a stylus according to an embodiment of the present application;

[0118] Figure 12 A structure diagram of a tail of a stylus according to an embodiment of the present application;

[0119] Figure 13 A structure diagram of a second light reflection structure according to an embodiment of the present application;

[0120] Figure 14 A structure diagram of a second light reflection structure according to an embodiment of the present application; Figure 13 A-A sectional view of the second light reflection structure;

[0121] Figure 15 A structure diagram of a tail of a stylus according to an embodiment of the present application;

[0122] Figure 16 is an exploded view of Figure 15

[0123] Figure 17 is a cutaway view of Figure 15

[0124] Figure 18 is a structural schematic view of a support provided by an embodiment of the present application;

[0125] Figure 19 is a structural schematic view of a pen tail of a stylus provided by an embodiment of the present application;

[0126] Figure 20 is a schematic view of the positional relationship of a third light reflection structure, a fourth light reflection structure and a photodetector provided by an embodiment of the present application;

[0127] Figure 21 is a structural schematic view of a pen tail of a stylus provided by an embodiment of the present application;

[0128] Figure 22 is a structural schematic view of a pen tail of a stylus provided by an embodiment of the present application.

[0129] Reference signs:

[0130] 100 - stylus; 101 - pen body; 102 - pen head; 103 - pen tail; 103A - light-transmissive region; 1031 - housing;

[0131] 1 - light-emitting device; 2 - photodetector; 31 - first light reflection structure; 32 - third light reflection structure; 31A - base; 32A - reflective film; 321 - metal film; 322 - dielectric film; 3221 - first dielectric film; 3222 - second dielectric film; 3223 - third dielectric film; 41 - second light reflection structure; 42 - fourth light reflection structure; 401 - light-transmissive hole; 402 - reflective portion; 4A - first mirror; 4B - second mirror; 4C - third mirror; 4D - fourth mirror; 5 - diffusion plate; 6 - support; 61 - first support platform; 62 - second support platform. DETAILED DESCRIPTION

[0132] An embodiment of the present application provides a stylus which can be used with an electronic device having a touch display screen. The electronic device can be a desktop computer, a laptop, a tablet, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a POS machine, a personal digital assistant (PDA) and the like mobile terminal, a fixed terminal or a foldable device.​​

[0133] As Figure 1 , Figure 1 is a structural diagram of a stylus 100 according to an example of the present application. The stylus 100 can provide input to an electronic device having a touch display, and the electronic device can perform an operation in response to the input based on the input of the stylus 100. For example, the stylus 100 can pick up some color, text, or texture and apply it to a graphic pattern drawn by the electronic device.

[0134] As Figure 1 , the stylus 100 can include a body 101, a tip 102, and a tail 103. In some examples, the tip 102 can be integrally formed with the body 101. In other examples, the tip 102 can be detachably connected to the body 101 using a connection structure, such as a threaded connection structure or a clamping structure, such as a cooperating clasp and slot.

[0135] The body 101 can include a receiving space in which some structural members or electronic devices can be disposed. For example, a battery can be disposed in the receiving space to provide power to the stylus.

[0136] The stylus 100 for inputting to an electronic device can include a light emitting device for emitting a light signal from a target object and a photoelectric detector for sensing the light signal reflected from the target object.

[0137] The light emitting device can be a light emitting diode, such as an LED (Light Emitting Diode).

[0138] In some examples, when the photoelectric detector senses the color of the light signal reflected from the target object, the photoelectric detector can include an XYZ sensor or an RGB sensor. In other examples, when the photoelectric detector senses the pattern of the light signal reflected from the target object, the photoelectric detector can include a CMOS (Complementary Metal Oxide Semiconductor) detector or a CCD (Charge-Coupled Device).

[0139] In order to improve the touch sensitivity, the light emitting device and the photoelectric detector of the above-described example can be disposed in the tip 102. Figure 1The space within the pen tail 103 is relatively small, which limits the size of the light-emitting device and the photodetector. Consequently, the light-emitting area of ​​the light-emitting device and the photosensitive area of ​​the photodetector are both small, resulting in low emission power of the light-emitting device and low detection sensitivity of the photodetector.

[0140] To address the issues of low emission power in light-emitting devices and low detection sensitivity in photodetectors, embodiments of this application provide some feasible structures.

[0141] like Figure 2 , Figure 2 This is a simplified structural diagram of a pen tail provided in an embodiment of this application. Figure 2 The diagram illustrates the positional relationship between the light-emitting device 1 and the photodetector 2. The light-emitting device 1 and the photodetector 2 can be arranged along the length of the stylus, as shown below. Figure 1 and Figure 2 The light-emitting device 1 and the photodetector 2 can be arranged along the X direction.

[0142] The light-emitting device 1 and the photodetector 2 can be arranged along the length of the stylus, or along the radial direction of the stylus (e.g., the light-emitting device 1 and the photodetector 2 can be arranged along the radial direction of the stylus). Figure 1 and Figure 2 The stylus can be arranged in the Y direction. A light-emitting device 1 with a large light-emitting area can be selected, and a photodetector 2 with a large photosensitive area can be selected. This can improve the emission power of the light-emitting device and the detection sensitivity of the photodetector. For example, when the stylus is used to pick up colors, the color signal-to-noise ratio can be improved and the color picking accuracy can be improved.

[0143] See Figure 2 The photodetector 2 is located in the optical path of the light-emitting device 1. This can be understood as the light-emitting device 1 being positioned closer to the photodetector 2 than the light-emitting device 1. Figure 1 The pen font shown is 101.

[0144] like Figure 2 Since the photodetector 2 is located in the optical path of the light-emitting device 1, part of the light emitted from the light-emitting device 1 will be blocked by the photodetector 2. In order to allow the light blocked by the photodetector 2 to be emitted from the stylus, the stylus may also include a first light-reflecting structure 31 and a second light-reflecting structure 41. The first light-reflecting structure 31 is located in the optical path of the light-emitting device 1 and is used to reflect the light from the light-emitting device 1; the second light-reflecting structure 41 is located in the optical path of the reflected light from the first light-reflecting structure 31 and is used to reflect the light from the first light-reflecting structure 31.

[0145] exist Figure 2In some examples, the light emitted by the light emitting device 1 can be reflected by the first light reflecting structure 31 and the second light reflecting structure 41, and can be projected to the outside of the stylus and onto the target object.

[0146] With the first light reflecting structure 31 and the second light reflecting structure 41 cooperating, the light path of the light emitted by the light emitting device 1 can be changed, and the light blocked by the photodetector 2 can be projected to the outside of the stylus, so that the light emitting efficiency of the light emitting device 1 is not reduced.

[0147] As shown in Figure 2 , the thick and arrowed dashed line schematically shows the light path of the light reflected by the target object and projected onto the photodetector 2. Since the photodetector 2 is arranged close to the outside of the stylus, the light signal reflected by the target object can be fully received, and the detection sensitivity of the photodetector is improved.

[0148] As shown in Figure 2 , the first light reflecting structure 31 is arranged on the side of the photodetector 2 facing the light emitting device 1. Alternatively, the photodetector 2 has a light receiving surface and a back surface opposite to the light receiving surface, and Figure 2 In some examples, the light receiving surface of the photodetector 2 faces the outside of the stylus, and the first light reflecting structure 31 is arranged on the back surface of the photodetector 2; the light emitting device 1 has a light emitting surface and a back surface opposite to the light emitting surface, and the first light reflecting structure 31 is arranged between the light emitting surface of the light emitting device 1 and the back surface of the photodetector 2.

[0149] In some examples, the second light reflecting structure 41 is arranged between the light emitting device 1 and the first light reflecting structure 31.

[0150] In Figure 2 some examples, in order to make more light emitted by the light emitting device 1 be received by the first light reflecting structure 31 and improve the light coupling efficiency of the light emitting device 1, as shown in Figure 3 , the second light reflecting structure 41 is provided with a light passing hole 401, and the light emitted by the light emitting device 1 can pass through the light passing hole 401 and be projected to the first light reflecting structure 31, so that more light emitted by the light emitting device 1 is projected to the first light reflecting structure 31.

[0151] As shown in Figure 3 , the part of the second light reflecting structure 41 located at the outer periphery of the light passing hole 401 forms a reflecting portion 402, and the reflecting portion 402 is used to reflect the reflected light from the first light reflecting structure 31.

[0152] In order to allow more light from the light-emitting device 1 to be received by the first light-reflecting structure 31, the projection of the light-passing aperture 401 onto the light-emitting surface of the light-emitting device 1 is located outside the light-emitting surface of the light-emitting device 1. This can be understood as the area of ​​the light-passing aperture 401 being larger than the area of ​​the light-emitting surface of the light-emitting device 1.

[0153] To ensure that more light from the light-emitting device 1 is received by the first light-reflecting structure 31 and to improve optical coupling efficiency, the projection of the first light-reflecting structure 31 onto the light-emitting surface of the light-emitting device 1 is located outside the light-emitting surface of the light-emitting device 1. This can be understood as the area of ​​the reflective surface of the first light-reflecting structure 31 being larger than the area of ​​the light-emitting surface of the light-emitting device 1.

[0154] In some alternative structures, aperture 401 can be Figure 3 The circular hole shown. In some other alternative configurations, the light-passing hole 401 can be... Figure 3 The elliptical or square hole shown.

[0155] like Figure 3 The example shows a circular first light-reflecting structure 31. In other examples, the first light-reflecting structure 31 can be elliptical, rectangular, or other shapes.

[0156] In some optional processes, a reflector can be used, with an aperture 401 formed on it, to produce a result similar to... Figure 3 The second light-reflecting structure 41 is shown.

[0157] In other examples, such as Figure 4 As shown, the second light-reflecting structure 41 includes multiple mirrors connected sequentially along the circumference to form a reflective structure with a light-passing aperture 401. For example, in Figure 4 The system includes a first reflector 4A, a second reflector 4B, a third reflector 4C, and a fourth reflector 4D, which are sequentially assembled to form a light-passing aperture 401. Adjacent reflectors 4A, 4B, 4C, and 4D can be connected with adhesive.

[0158] There are various possible implementations for the first light reflection structure 31 and the second light reflection structure 41, some of which are exemplified below.

[0159] Taking the first light-reflecting structure 31 as an example, such as Figure 5 The first light-reflecting structure 31 may include a substrate 31A and a reflective film 32A disposed on the substrate 31A.

[0160] For example, the base 31A can be made of glass or metal, and the surface of the glass or metal can be polished.

[0161] As Figure 6 The reflective film 32A can include a metal film 321 stacked on the base 31A and a dielectric film 322 stacked on the metal film 321. In some alternative materials, the metal film 321 can include at least one of aluminum, silver, and gold. The dielectric film 322 can include at least one of silicon dioxide and silicon nitride.

[0162] Figure 6 In some examples, the metal film 321 is relatively soft, and the dielectric film 322 can be used to protect the metal film 321 and improve the reliability of the light reflection structure.

[0163] In addition, the metal film 321 can be used as a reflective film layer and has a relatively wide wavelength range, which can improve the light coupling efficiency.

[0164] In some implementations, the metal film 321 can be stacked on the base 31A without the dielectric film 322. Alternatively, the dielectric film 322 can be stacked on the base 31A without the metal film 321.

[0165] To improve the light reflection efficiency, as Figure 7 a plurality of dielectric films can be stacked on the base 31A, and the refractive indices of adjacent two dielectric films are different. For example, the first dielectric film 3221, the second dielectric film 3222, and the third dielectric film 3223 can be stacked on the base 31A in sequence, and the refractive indices of the first dielectric film 3221, the second dielectric film 3222, and the third dielectric film 3223 are different. The reflection of the plurality of dielectric films can improve the reflectivity of the light reflection structure and reduce the light absorption loss.

[0166] As Figure 8 , Figure 8 The optical path relationship of the light emitting device 1, the first light reflection structure 31, and the second light reflection structure 41 is shown. In this example, the first light reflection structure 31 has a first reflection surface S1 for reflecting light from the light emitting device 1 to the second light reflection structure 41. The first reflection surface S1 is a convex surface, and the divergence of the convex surface can cause more light to be reflected to the second light reflection structure 41.

[0167] The first reflection surface S1 is a convex surface, which can be a hyperboloid or a spherical surface.

[0168] See Figure 8The second light reflection structure 41 includes a second reflection surface S2, the second reflection surface S2 is used to reflect light from the first light reflection structure 31; the second reflection surface S2 is a concave surface, and the concave surface is used to make the reflected light parallel to the stylus.

[0169] The second reflection surface S2 is a concave surface, and the concave surface can be a parabolic surface, a hyperbolic surface, an elliptical surface, or a spherical surface.

[0170] In order to improve the light coupling efficiency, as shown in Figure 8 The light emitting device 1 is located at the optical axis Q1 of the first light reflection structure 31, and the light emitting region of the light emitting device 1 is located in the light hole 401, so that more light of the light emitting device 1 can be projected onto the first light reflection structure 31.

[0171] The light emitting device 1 is located at the optical axis Q1 of the first light reflection structure 31, which can be understood as: the optical axis Q1 of the first light reflection structure 31 passes through the center of the light emitting surface of the light emitting device 1, and the center of the light emitting surface of the light emitting device 1 is substantially located at the optical axis Q1 of the first light reflection structure 31.

[0172] In order to improve the light coupling efficiency, the positional relationship between the first light reflection structure 31 and the second light reflection structure 41 can be:

[0173] In some examples, the optical axis Q1 of the first light reflection structure 31 and the optical axis Q2 of the second light reflection structure 41 can coincide, and the focal point of the first light reflection structure 31 and the focal point of the second light reflection structure 41 can not coincide, for example, the distance between the focal point F1 of the first light reflection structure 31 and the focal point F2 of the second light reflection structure 41 is: less than or equal to 30% of the focal length of the first light reflection structure 31, for example, the distance between the focal point F1 of the first light reflection structure 31 and the focal point F2 of the second light reflection structure 41 is equal to 20% of the focal length of the first light reflection structure 31.

[0174] In some examples, the optical axis Q1 of the first light reflection structure 31 and the optical axis Q2 of the second light reflection structure 41 can coincide, and the focal point of the first light reflection structure 31 and the focal point of the second light reflection structure 41 can not coincide, for example, the distance between the focal point F1 of the first light reflection structure 31 and the focal point F2 of the second light reflection structure 41 is: less than or equal to 30% of the focal length of the first light reflection structure 31, for example, the distance between the focal point F1 of the first light reflection structure 31 and the focal point F2 of the second light reflection structure 41 is equal to 20% of the focal length of the first light reflection structure 31. Figure 9 In some examples, the optical axis Q1 of the first light reflection structure 31 and the optical axis Q2 of the second light reflection structure 41 can coincide, and the focal point F1 of the first light reflection structure 31 and the focal point F2 of the second light reflection structure 41 can coincide. In this way, the light coupling efficiency can be further optimized, for example, the light transmission efficiency of the light emitting device 1 can be greater than or equal to 50%.

[0175] Figure 10 In some styluses, as shown in

[0176] In some styluses, as shown in Figure 10 ​The second light reflection structure 41 can be symmetrically arranged about the optical axis Q3 of the light emitting device 1. For example, in Figure 10 , the second light reflection structure 41 comprises a light passing hole 401 and a reflection part 402 surrounding the periphery of the light passing hole 401, the center of the light passing hole 401 can be on the optical axis of the light emitting device 1, and the reflection part 402 can be symmetrically arranged about the optical axis of the light emitting device 1.

[0177] In some styluses, the second light reflection structure 41 comprises a plurality of mirrors as shown in Figure 4 , the optical axes of the plurality of mirrors can coincide; or the optical axes of the plurality of mirrors can coincide, and the focal points of the plurality of mirrors can coincide.

[0178] In order to make the light emitted by the light emitting device 1 uniformly exit the stylus, the stylus can further comprise a diffuser 5, the diffuser 5 can disperse the light from the second light reflection structure 41 and make the light uniformly distributed and exit the stylus. In some structures, the diffuser 5 is arranged on the side of the reflection surface of the second light reflection structure 41. Figure 11 Figure 11

[0179] In some optional materials, the diffuser 5 can be selected from glass, polyethylene terephthalate (PET), polycarbonate (PC) or poly methylmethacrylate (PMMA). For example, the diffuser 5 can be frosted glass, opal glass or a PET plate doped with scattering particles.

[0180] The light emitted by the light emitting device 1 in the above examples can be composite light. In this way, the stylus can be used for color picking, pattern picking with color, etc.

[0181] Figure 12 is another simple structure diagram of the pen tail given by the embodiments of the present application, which Figure 12 shows the positional relationship between the light emitting device 1 and the photodetector 2. The light emitting device 1 and the photodetector 2 can be arranged along the length direction of the stylus, for example, the light emitting device 1 and the photodetector 2 can be arranged along the X direction. Figure 12

[0182] Figure 12 The light emitting device 1 and the photodetector 2 in the example are arranged along the length direction of the stylus, which can improve the emission power of the light emitting device, improve the detection sensitivity of the photodetector, and improve the use performance of the stylus.

[0183] In Figure 12 ​​​In the example, the photoelectric detector 2 is located on the light path of the light emitting device 1, which can be understood as that the light emitting device 1 is arranged closer to the pen body 101 than the photoelectric detector 2.

[0184] In Figure 12 In the example, the pen tail 103 includes a light-transmitting region 103A, the light-transmitting region 103A is an arc-shaped structure, the arc-shaped structure protrudes towards the outside of the pen tail, and the light emitted from the light-transmitting region 103A is parallel light.

[0185] In some styluses, a cap that is sleeved on the pen tail can not be arranged, and the arc-shaped structure shown in the figure can be directly used as the cap, so that the structure of the stylus can be simplified, and the appearance aesthetics can be optimized. Figure 13

[0186] In order to make the light emitted from the light-transmitting region 103A be parallel light, the second light reflecting structure 41 can adopt the structure shown in the figures, Figure 14 and Figure 14 Figure 14 is a sectional view along A-A of 13, wherein the second light reflecting structure 41 has a second reflecting surface S2, the second reflecting surface S2 can be a concave surface as shown in the figure. Figure 12

[0187] By matching the concave second reflecting surface S2 and the arc-shaped light-transmitting region 103A shown in the figure, the light emitted from the light-transmitting region 103A can be parallel light. Figure 14

[0188] As Figure 15 shown in the figure, the curvature of the concave surface can be matched with the curvature of the arc-shaped light-transmitting region 103A, so that the light emitted from the light-transmitting region 103A can be parallel light.

[0189] Figure 16 、 Figure 17 and Figure 16 are structural schematic diagrams of a pen tail given by the embodiments of the present application, Figure 15 is an exploded view of Figure 17 , Figure 15 is a sectional view of Figure 16 . The pen tail 103 includes a shell 1031, the shell 1031 has a light-transmitting region 103A, Figure 17 The light-transmitting region 103A is separated from the shell 1031, in some structures, the light-transmitting region 103A and the shell 1031 are an integral structure.

[0190] The shell 1031 has a containing space, some structures such as the light emitting device 1, the photoelectric detector 2, the first light reflecting structure 31 and the second light reflecting structure 41 are arranged in the containing space.

[0191] As Figure 17 ​​​​The support 6 can be arranged in the accommodating space, such as Figure 18 and Figure 19 The support 6 has a first support platform 61, and the light emitting device 1 can be arranged on the first support platform 61. The support 6 also has a second support platform 62, and the second light reflecting structure 41 is arranged on the second support platform 62.

[0192] The diffusion plate 5 serves as a support structure of the first light reflecting structure 31 and the photodetector 2, and the first light reflecting structure 31 and the photodetector 2 are oppositely arranged on two sides of the diffusion plate 5.

[0193] Figure 19 is another structure diagram of the pen tail given by the embodiment of the present application, which Figure 19 demonstrates the positional relationship between the light emitting device and the photodetector. The light emitting device 1 and the photodetector 2 can be arranged along the length direction of the stylus, such as Figure 19 , the light emitting device 1 and the photodetector 2 can be arranged along the X direction.

[0194] The light emitting device 1 and the photodetector 2 can be arranged along the length direction of the stylus. Compared with the light emitting device 1 and the photodetector 2 arranged along the radial direction (such as Figure 19 Y direction) of the stylus, the light emitting device 1 with a larger light emitting area can be selected, and the photodetector 2 with a larger light receiving area can be selected. In this way, the emission power of the light emitting device can be improved, and the detection sensitivity of the photodetector can be improved. For example, when the stylus is used for color picking, the color picking signal-to-noise ratio and the color picking accuracy can be improved.

[0195] In Figure 1 the example, the photodetector 2 has a light receiving surface for receiving light reflected by a target object. The light emitting device 1 is located on the side of the light receiving surface of the photodetector 2. It can be understood that the setting position of the photodetector 2 is closer to Figure 19 the pen body 101 than the setting position of the light emitting device 1. In this way, more light emitted by the light emitting device 1 can irradiate the target object.

[0196] As Figure 19 the light emitting device 1 is located on the side of the light receiving surface of the photodetector 2, the light emitting device 1 is located in the light path of the photodetector 2. In order to make more light reflected by the target object be received by the photodetector 2, such as Figure 19 , a third light reflecting structure 32 and a fourth light reflecting structure 42 can also be included. The third light reflecting structure 32 is located in the light path of the light reflected by the target object, and the third light reflecting structure 32 is used to reflect the light from the target object. The fourth light reflecting structure 42 is located in the light path of the reflected light of the third light reflecting structure 32, and the fourth light reflecting structure 42 is used to reflect the light from the third light reflecting structure 32 to the photodetector 2.

[0197] The light emitting device 1 is located on the light path of the photodetector 2, which can be understood as: the light reflected from the target object to the photodetector 2 has a light path, and the light emitting device 1 is located on the light path.

[0198] In Figure 19 , the thicker dashed line with arrows schematically shows the propagation path of the light reflected from the target object to the photodetector. The light reflected from the target object can be projected onto the third light reflecting structure 32, the third light reflecting structure 32 reflects the light from the target object and reflects onto the fourth light reflecting structure 42, the fourth light reflecting structure 42 reflects the light from the third light reflecting structure 32, and can be reflected onto the photodetector 2 and received by the light receiving surface of the photodetector 2.

[0199] Since the light emitting device 1 is located on the light receiving surface side of the photodetector 2, in order to make the light reflected from the target object more received by the photodetector 2, as Figure 19 , the orthographic projection of the photodetector 2 on the third light reflecting structure 32 is located within the edge of the third light reflecting structure 32, which can be understood as: the area of the third light reflecting structure 32 is greater than the area of the photodetector 2.

[0200] See Figure 19 , the third light reflecting structure 32 is arranged on the light receiving surface side of the photodetector 2. The fourth light reflecting structure 42 is arranged between the light emitting device 1 and the third light reflecting structure 32.

[0201] In order to compress the space occupied by the fourth light reflecting structure 42, as Figure 19 , the fourth light reflecting structure 42 is arranged on the side away from the light emitting surface of the light emitting device 1, that is, the fourth light reflecting structure 42 is located on the back of the light emitting device 1.

[0202] As Figure 19 shown, the third light reflecting structure 32 is provided with a light passing hole, and the light reflected by the fourth light reflecting structure 42 can pass through the light passing hole and project onto the photodetector 2.

[0203] As Figure 19 shown, the part of the third light reflecting structure 32 located on the outer periphery of the light passing hole 321 forms a reflecting part, and the reflecting part is used to reflect the light from the target object.

[0204] Figures 5 to 7 The third light reflecting structure 32 and the fourth light reflecting structure 42 in the example can adopt the structure shown in the above Figure 20 . For example, the third light reflecting structure 32 can include a substrate and a reflecting film arranged on the substrate, the reflecting film can include at least one of a metal film or a dielectric film, or the reflecting film can include a plurality of stacked dielectric films, and the refractive indexes of adjacent two layers of dielectric films are different.

[0205] As Figure 20 , Figure 20 The optical path relationship of the photodetector 2, the third light reflection structure 32 and the fourth light reflection structure 42 is shown. In this example, the third light reflection structure 32 has a third reflection surface Q3 for reflecting light from the target object to the fourth light reflection structure 42; the third reflection surface Q3 is a concave surface, which makes more light reflected to the fourth light reflection structure 42.

[0206] The third reflection surface Q3 is a concave surface, which can be a parabolic surface, a hyperbolic surface, an elliptical surface or a spherical surface.

[0207] See Figure 20 , the fourth light reflection structure 42 includes a fourth reflection surface Q4 for reflecting light from the third light reflection structure 32 to the photodetector 2; the fourth reflection surface Q4 is a convex surface.

[0208] The fourth reflection surface Q4 is a convex surface, which can be a hyperbolic surface or a spherical surface.

[0209] In order to improve the light coupling efficiency, the photodetector 2 is located at the optical axis of the fourth light reflection structure 42, so that more light reflected by the fourth light reflection structure 42 can be projected onto the photodetector 2. It can also be understood that the optical axis of the fourth light reflection structure 42 passes through the center of the light-sensitive surface of the photodetector 2.

[0210] The reflected light area of the fourth light reflection structure 42 is in the light hole, which can make the photodetector 2 receive more light.

[0211] In order to improve the light coupling efficiency, in Figure 20 In some examples, the optical axis of the third light reflection structure 32 and the optical axis of the fourth light reflection structure 42 can coincide, and the focal point of the third light reflection structure 32 and the focal point of the fourth light reflection structure 42 can not coincide. In other examples, the optical axis of the third light reflection structure 32 and the optical axis of the fourth light reflection structure 42 can coincide, and the focal point of the third light reflection structure 32 and the focal point of the fourth light reflection structure 42 can coincide.

[0212] In some styluses, such as Figure 20 , the fourth light reflection structure 42 can be symmetrically arranged about the optical axis of the photodetector 2. In turn, the third light reflection structure 31 can receive more light from the light emitting device 1, improving the light coupling efficiency of the light emitting device 1.

[0213] The light emitted by the light emitting device 1 of the above Figure 21 example can be composite light. In this way, the stylus can be used for color picking, pattern picking with color, etc.

[0214] Figure 21 is another structure diagram of the tail of the stylus given by an embodiment of the present application, and Figure 21 shows the positional relationship between the light emitting device 1 and the photodetector 2. The light emitting device 1 and the photodetector 2 can be arranged along the length direction of the stylus, such as Figure 21 The light emitting device 1 and the photodetector 2 can be arranged along the X direction.

[0215] Figure 21 The light emitting device 1 and the photodetector 2 of the example are arranged along the length direction of the stylus, which can improve the emission power of the light emitting device, improve the detection sensitivity of the photodetector, and improve the use performance of the stylus.

[0216] Figure 19 The difference between the example and the above Figure 21 includes that the tail 103 includes a light transmission region 103A, the light transmission region 103A is an arc-shaped structure, so that more light reflected by the target object can be received by the photodetector 2, such as Figure 2 The reflecting surface of the third light reflection structure 32 is a concave surface.

[0217] In the above Figure 12 , Figure 19 and Figure 21 , and Figure 22 , the color of the target object can be obtained.

[0218] In some scenarios, when the external environment light is relatively strong, the direct method can be used to obtain the color. For example, the light emitting device 1 does not work, the light signal reflected by the target object is measured by the photodetector 2, which can be referred to as a target spectrum, and the stylus converts the target spectrum into a color value.

[0219] In some other scenarios, when the external environment light is relatively weak, the two-step method can be used to obtain the color. For example, the light emitting device 1 does not work, the external environment spectrum is measured by the photodetector 2; the light emitting device 1 works, the spectrum of the light emitted by the light emitting device 1 reflected by the target object is measured by the photodetector 2, and then the inherent reflection spectrum of the target object is determined according to the spectrum of the light emitted by the light emitting device 1 reflected by the target object measured by the photodetector 2 and the spectrum of the light emitted by the light emitting device 1; then the spectrum of the light reflected by the target object is determined according to the inherent reflection spectrum of the target object and the external environment spectrum measured by the photodetector 2; and then the spectrum of the light reflected by the target object is converted into a color value.

[0220] Figure 22 is another structure diagram of the tail of the stylus given by an embodiment of the present application, and Figure 22The positional relationship between the light emitting device and the photoelectric detector is shown. The light emitting device 1 and the photoelectric detector 2 can be arranged along the length direction of the stylus, as shown in Figure 22 The light emitting device 1 and the photoelectric detector 2 can be arranged along the X direction.

[0221] Figure 22 In the example, the light emitting device 1 and the photoelectric detector 2 are arranged along the length direction of the stylus, which can improve the emission power of the light emitting device, improve the detection sensitivity of the photoelectric detector, and improve the use performance of the stylus.

[0222] In Figure 22 the example, the photoelectric detector 2 is located on the light path of the light emitting device 1, which can be understood as: the setting position of the light emitting device 1 is closer to the pen body 101 than the setting position of the photoelectric detector 2.

[0223] In some use scenarios, such as using the stylus to take texture or not along the pattern, the example shown in Figure 22 may be used.

[0224] In Figure 22 the example, the first light reflection structure 31 and the second light reflection structure 41 are sequentially arranged on the light path of the light emitting device 1, the first light reflection structure 31 is used to reflect the first light beam P1 with the first wavelength, and transmit the second light beam P2 with the second wavelength, and project the second light beam P2 with the second wavelength onto the second light reflection structure 41.

[0225] The second light reflection structure 41 reflects the second light beam P2 with the second wavelength onto the first light reflection structure 31, and reflects it to the outside of the stylus through the first light reflection structure 31.

[0226] It can be understood that the first light reflection structure 31 in the example has a wavelength selection function, which can reflect the first light beam with the first wavelength and transmit the second light beam with the second wavelength. Figure 22

[0227] In some examples, as shown in ​ , the first light reflection structure 31 has opposite first surface S1 and second surface S2, and the first surface S1 can have a first reflection film layer, which is used to fully reflect the first light beam with the first wavelength and transmit the second light beam with the second wavelength.

[0228] The second light reflection structure 41 has a third surface S3, and the third surface S3 has a third reflection film layer, which is used to fully reflect the second light beam with the second wavelength.

[0229] ​On the second surface S2 of the first light reflection structure 31, in addition to being able to transmit the second light beam having the second wavelength, part of the area is also used to reflect the second light beam having the second wavelength reflected by the second light reflection structure 41.

[0230] In the different examples shown above, the assembly comprising the light emitting device, the photodetector, the first light reflection structure and the second light reflection structure can also be used as a detection device, which can be arranged in other electronic devices, such as wearable devices, such as watches, bracelets, etc. The detection device arranged in the wearable device can be used to detect at least one of heart rate, blood pressure, blood oxygen, etc.

[0231] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0232] The above describes only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A stylus, characterized by The application relates to a stylus, which comprises: a pen shell; a light-emitting device, a photodetector, a first light reflection structure and a second light reflection structure arranged in the pen shell; the photodetector is arranged on the light path of the light-emitting device; the first light reflection structure is arranged on the light path of the light-emitting device, and the first light reflection structure is used for reflecting light from the light-emitting device; the second light reflection structure is arranged on the light path of the reflected light of the first light reflection structure, and the second light reflection structure is used for reflecting light from the first light reflection structure; a light passing hole is formed in the second light reflection structure, and light from the light-emitting device can pass through the light passing hole and project to the first light reflection structure; the first light reflection structure comprises a first reflection surface, the first reflection surface is a convex surface, and the first reflection surface is used for reflecting light from the light-emitting device to the second light reflection structure; the second light reflection structure comprises a second reflection surface, the second reflection surface is a concave surface, and the second reflection surface is used for reflecting light from the first light reflection structure.

2. The stylus of claim 1, wherein, The light-emitting device and the photodetector are arranged along the length direction of the pen shell; the first light reflection structure is arranged on the side of the photodetector which faces the light-emitting device; the second light reflection structure is arranged between the light-emitting device and the first light reflection structure; the part of the second light reflection structure which is located at the periphery of the light passing hole forms a reflection part, and the reflection part is used for reflecting the reflected light from the first light reflection structure.

3. The stylus of claim 2, wherein, The second light reflection structure comprises one mirror, and the light passing hole is arranged on the one mirror.

4. The stylus according to claim 2 or 3, wherein: the first light reflection structure is symmetrical about the optical axis of the light-emitting device; or the reflection part is symmetrical about the optical axis of the light-emitting device.

5. The stylus according to claim 2 or 3, characterized in that, The optical axis of the first light reflection structure passes through the center of the light-emitting surface of the light-emitting device, and the light-emitting region of the light-emitting device is located in the light passing hole; or the focal point of the first light reflection structure and the focal point of the second light reflection structure coincide.

6. The stylus according to any one of claims 1-3, wherein, The pen shell comprises a light-transmitting region, and the light-transmitting region is an arc-shaped structure which protrudes towards the outside of the pen shell.

7. The stylus of claim 6, wherein, The reflection surface of the second light reflection structure is a concave surface, the concave surface is used for reflecting light from the first light reflection structure to the arc-shaped structure, and the light emitted from the arc-shaped structure is parallel light.

8. The stylus according to any one of claims 1-3, wherein, The first light reflection structure or the second light reflection structure comprises a base body and a reflection film, and the reflection film is stacked on the base body.

9. The stylus according to claim 8, wherein: the reflection film comprises a metal film, and the metal film is stacked on the base body; or the reflection film comprises a metal film and a dielectric film, the metal film is stacked on the base body, and the dielectric film is stacked on the side of the metal film which is away from the base body; or the reflection film comprises a plurality of dielectric films, and the plurality of dielectric films are stacked on the base body, and the refractive indexes of adjacent two layers of the dielectric films are different.

10. The stylus according to any one of claims 1-3, wherein, The stylus further comprises: a diffusion member, which is arranged on the light path of the reflected light of the second light reflection structure.

11. A stylus, characterized by The application relates to a stylus, which comprises: a pen shell; a light emitting device, a photodetector, a third light reflecting structure and a fourth light reflecting structure located in the pen shell, the photodetector being configured to receive reflected light from a target object; the third light reflecting structure is located in the light path of the reflected light from the target object, and is configured to reflect the reflected light from the target object; the fourth light reflecting structure is located in the light path of the reflected light from the third light reflecting structure, and is configured to reflect the reflected light from the third light reflecting structure to the photodetector; the light emitting device is disposed on a side of the fourth light reflecting structure away from the photodetector, and the light emitting device and the fourth light reflecting structure are oppositely disposed; the third light reflecting structure is provided with a light passing hole, and the reflected light from the fourth light reflecting structure can pass through the light passing hole to project onto the photodetector; the third light reflecting structure comprises a third reflecting surface, the third reflecting surface is a concave surface, and the third reflecting surface is configured to reflect light from the target object to the fourth light reflecting structure; the fourth light reflecting structure comprises a fourth reflecting surface, the fourth reflecting surface is a convex surface, and the fourth reflecting surface is configured to reflect light from the third light reflecting structure to the photodetector.

12. The stylus of claim 11, wherein, the light emitting device and the photodetector are arranged along the length direction of the pen shell; the third light reflecting structure is disposed on a side of the light sensitive surface of the photodetector; the fourth light reflecting structure is disposed between the light emitting device and the third light reflecting structure; a part of the third light reflecting structure located at the periphery of the light passing hole forms a reflecting part, and the reflecting part is configured to reflect light from the target object.

13. The stylus of claim 12, wherein, the third light reflecting structure comprises one reflecting mirror, and the light passing hole is disposed on the one reflecting mirror.

14. The stylus according to claim 12 or 13, wherein the third light reflecting structure is symmetrical about the optical axis of the photodetector; or the reflecting part is symmetrical about the optical axis of the photodetector.

15. The stylus according to claim 12 or 13, characterized in that, an optical axis of the fourth light reflecting structure passes through the center of the light sensitive surface of the photodetector, a reflecting light area of the fourth light reflecting structure is located within the light passing hole; or a focal point of the third light reflecting structure coincides with a focal point of the fourth light reflecting structure.

16. The stylus according to any one of claims 11-13, wherein, the pen shell comprises a light transmitting area, and the light transmitting area is an arc structure protruding towards the outside of the pen shell.

17. The stylus of claim 16, wherein, a reflecting surface of the third light reflecting structure is a concave surface, and the concave surface is configured to reflect light from the arc structure to the fourth light reflecting structure.

18. The stylus according to any one of claims 11-13, wherein, the third light reflecting structure or the fourth light reflecting structure comprises a substrate and a reflecting film, and the reflecting film is stacked on the substrate.

19. The stylus according to claim 18, wherein the reflecting film comprises a metal film, and the metal film is stacked on the substrate; or the reflecting film comprises a metal film and a dielectric film, the metal film is stacked on the substrate, and the dielectric film is stacked on a side of the metal film away from the substrate; or the reflecting film comprises a metal film and a dielectric film, the metal film is stacked on the substrate, and the dielectric film is stacked on a side of the metal film away from the substrate. The reflective film includes a multilayer dielectric film, the multilayer dielectric film is stacked on the substrate, and the refractive indexes of two adjacent layers of the dielectric film are different.

20. An electronic device, comprising: Comprising: A terminal body, the terminal body comprising a display screen; The stylus according to any one of claims 1-19.

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