CN111273441A - Optical module and electronic equipment - Google Patents
Optical module and electronic equipment Download PDFInfo
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- CN111273441A CN111273441A CN202010114948.5A CN202010114948A CN111273441A CN 111273441 A CN111273441 A CN 111273441A CN 202010114948 A CN202010114948 A CN 202010114948A CN 111273441 A CN111273441 A CN 111273441A
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0093—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
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Abstract
The invention relates to an optical module and an electronic device comprising the same. The optical module comprises a substrate, a mask layer and a light source. The substrate is provided with a light incident surface. The light shield layer is arranged on the light incoming surface, a plurality of diffraction slits are arranged on the light shield layer to form a light incoming area, and the area of each diffraction slit is gradually reduced in the direction that the geometric center of the light incoming area points to the edge of the light incoming area. The light source is provided with a light emitting surface, the light source is arranged on the light incoming surface and is separated from the light incoming surface, and the light emitting surface deviates from the light incoming surface. The optical module is small in size, can meet the requirement of miniaturization design of electronic equipment, and has good imaging quality.
Description
Technical Field
The present invention relates to the field of virtual imaging technologies, and in particular, to an optical module and an electronic device.
Background
In Virtual imaging electronic devices such as Virtual Reality (VR) devices, Augmented Reality (AR) devices, and Mediated Reality (MR) devices, an eyeball tracking module is usually configured to track the movement of human eyeballs, and the position and angle of an image are changed according to the movement of the human eyeballs, so that people can feel personally on the scene. However, the conventional eye tracking module usually needs to be configured with a light source and a lens assembly, the light source emits light to the human eyeball, and the lens assembly processes the light reflected from the human eyeball, so that the size of the eye tracking module is large, and it is difficult to meet the requirement of miniaturization design of electronic equipment.
Disclosure of Invention
Accordingly, there is a need to provide an optical module and an electronic apparatus for solving the problem that the size of the conventional eye-tracking module is large and the miniaturization design of the electronic apparatus is difficult.
An optical module, comprising:
a substrate having a light incident surface;
the mask layer is arranged on the light incoming surface, a plurality of diffraction slits are arranged on the mask layer to form a light incoming area, and the area of each diffraction slit is gradually reduced in the direction that the geometric center of the light incoming area points to the edge of the light incoming area; and
the light source is provided with a light emitting surface, the light source is arranged on the light incoming surface and is separated from the light incoming surface, and the light emitting surface deviates from the light incoming surface.
In one embodiment, the light sources are arranged in a plurality, and the light sources are distributed on two sides of the light incoming area; or
The light sources are arranged in a plurality of numbers, and the light sources are arranged around the light incoming area.
In one embodiment, the plurality of diffraction slits are independent of or in communication with each other.
In one embodiment, in the direction that the geometric center of the light incoming area points to the edge of the light incoming area, a plurality of diffraction gaps are communicated with one another to form vortex-shaped stripes.
In one embodiment, a plurality of diffraction slits are communicated with one another to form a vortex-shaped stripe; or
The plurality of diffraction slits are communicated with each other to form two mutually staggered spiral-shaped stripes.
In one embodiment, a portion of the mask layer in the light incident area is composed of a plurality of light shielding spots spaced from each other, the light shielding spots are uniformly distributed along the circumferential direction of the light incident area, and the area of the light shielding spots gradually decreases in a direction in which the geometric center of the light incident area points to the edge of the light incident area.
In one embodiment, the light incident area has at least one symmetry axis, the symmetry axis passes through the geometric center of the light incident area, and the diffraction slits are distributed in an axisymmetric manner about the symmetry axis.
In one embodiment, the light incident area has two symmetry axes, and the two symmetry axes are perpendicular to each other.
An electronic equipment, includes photosensitive element and above-mentioned arbitrary embodiment optical module, on the base plate with go into the relative surface of plain noodles and do the play plain noodles of base plate, photosensitive element has the photosurface, photosensitive element set up in the base plate deviates from go into the one side of plain noodles, just the photosurface orientation go out the plain noodles setting.
In one embodiment, the optical modules are two, the light incident surface of one optical module is used for receiving light reflected by a corresponding human eyeball, the photosensitive element is two, and the photosensitive surface of one photosensitive element faces the light emergent surface of a corresponding optical module.
According to the optical module, the substrate and the photomask layer are adopted to replace a lens group in a common eyeball tracking module, so that the size of the optical module is greatly reduced. Meanwhile, the light source is arranged on the light emitting surface of the substrate, an additional carrier is not needed for mounting the light source, and the size of the optical module can be further reduced so as to meet the requirement of miniaturization design of electronic equipment. In addition, set up the income light zone that is formed by many diffraction gaps on the photomask layer, and in the direction of going into the edge of light zone of the geometric centre point of light zone, the area of diffraction gap reduces gradually, thereby make the light that shines into different positions in light zone can take place independent diffraction, and the light luminance that sees through into the light zone mid portion is higher, have higher degree of consistency and sufficient luminance behind this assurance light through the photomask layer and image, and then also can have good image quality after making the optical module size reduce.
Drawings
FIG. 1 is a schematic view of an optical module according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of an optical module from another angle in an embodiment of the present application;
fig. 3 is a schematic view of a distribution pattern of a light incident area in a first embodiment of the present application;
fig. 4 is a schematic view of a distribution pattern of a light incident area in a second embodiment of the present application;
fig. 5 is a schematic view of a distribution pattern of a light incident area in a third embodiment of the present application;
fig. 6 is a schematic view of a distribution pattern of a light incident area in a fourth embodiment of the present application;
fig. 7 is a schematic view of a distribution pattern of a light incident area in a fifth embodiment of the present application.
100, an optical module; 110. a substrate; 111. a light incident surface; 112. a light-emitting surface; 120. a mask layer; 121. a light entering area; 122. a diffraction slit; 123. light spots are shielded; 130. a light source; 131. a light emitting face; 140. a photosensitive element; 141. a light-sensitive surface; 150. a circuit board.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 1 and 2, an optical module 100 includes a substrate 110, a mask layer 120, and a light source 130. The substrate 110 has a light incident surface 111 and a light emitting surface 112 opposite to each other, and the mask layer 120 is disposed on the light incident surface 111. The mask layer 120 has a light incident area 121, a plurality of diffraction slits 122 are provided in the light incident area 121, and the plurality of diffraction slits 122 together form a distribution pattern of the light incident area 121. Light can pass through the mask layer 120 from the diffraction slit 122 of the light incident region 121, while the rest of the mask layer 120 is opaque. The light source 130 may be directly disposed on the light incident surface 111, or may be disposed on a surface of the mask layer 120 away from the light incident surface 111, and the light source 130 is spaced apart from the light incident region 121. Further, the light source 130 has a light emitting surface 131, and the light emitting surface 131 is disposed away from the light incident surface 111.
More specifically, in some embodiments, the optical module 100 may further include a photosensitive element 140, and the photosensitive element 140 has a photosensitive surface 141. The light sensing element 140 is disposed on a side of the substrate 110 away from the light incident surface 111, and the light sensing surface 141 faces the light emitting surface 112. In some embodiments, the optical module 100 can be used for tracking and imaging the motion of the object to be measured. Specifically, the light emitting surface 131 of the light source 130 emits light toward the object to be measured, the light is reflected by the object to be measured and then returns to the mask layer 120, and after passing through the mask layer 120 in the light incident region 121, enters the substrate 110 through the light incident surface 111. The light is emitted from the light-emitting surface 112 of the substrate 110 and forms an image on the light-sensing surface 141 of the light-sensing element 140.
It can be understood that, when the light source 130 is disposed on the light incident surface 111, a portion of the light emitted from the optical module 100, i.e., the light source 130, and a portion of the light received by the optical module 100, i.e., the mask layer 120, are coplanar with each other on the light incident surface 111. Thus, the optical module 100 can emit and receive light synchronously, even though the light signal between the optical module 100 and the object to be measured is more stable, thereby improving the imaging quality of the optical module 100.
In addition, in some embodiments, the photosensitive element 140 may be mounted on the circuit board 150 and electrically connected to a circuit in the circuit board 150, so as to convert an image received by the photosensitive element 140 into an electrical signal and transmit the electrical signal to a back-end device for analysis and processing. Specifically, the circuit board 150 may be a flexible circuit board or a printed circuit board. Also, in some embodiments, the photosensitive element 140 may be a Complementary Metal Oxide Semiconductor (CMOS) device.
In the optical module 100, the substrate 110 and the mask layer 120 are used to replace a conventional lens set, so that the size of the optical module 100 is greatly reduced, and meanwhile, the light source 130 is disposed on the light incident surface 111 of the substrate 110, so that the light source 130 does not need to be mounted by an additional carrier, and the size of the optical module 100 can be further reduced. For example, in some embodiments, the thickness of the substrate 110 and the mask layer 120 is 0.2mm, and the thickness of a lens assembly for tracking and imaging the motion of the object to be measured is 20mm-460 mm. Thus, the optical module 100 can be reduced in size.
In addition, it can be understood that, when the light incident region 121 is not provided with the diffraction slit 122, and the light incident surface 111 is exposed at the light incident region 121 of the mask layer 120, the light incident region 121 can be regarded as a small hole, and light reaches the light incident surface 111 through the light incident region 121, which is equivalent to imaging through a small hole. In this case, the light is diffracted, the diffraction degrees of different portions of the light are different, and the higher the diffraction degree of the light near the edge of the small hole, the larger the bending angle of the light near the edge of the small hole after diffraction. Therefore, the different diffraction degrees of the different portions of the light ray may cause the different intensities of the different portions of the light ray after passing through the small hole, that is, the light ray may be unevenly distributed, thereby affecting the imaging quality of the light ray on the photosensitive surface 141.
Therefore, in order to ensure good imaging quality after the light passes through the light incident region 121, referring to fig. 2, in some embodiments, a plurality of diffraction slits 122 are disposed in the light incident region 121. Thus, when light passes through the light incident region 121, different portions of light enter different diffraction slits 122 and are diffracted, which means that the light entering different portions of the light incident region 121 all have independent diffraction phenomena in different diffraction slits 122. At this time, the light entering the edge portion of the light incident region 121 and the light entering the middle portion of the light incident region 121 are independently diffracted in different diffraction slits 122, and the diffraction degrees are slightly different. So, can with get into the light in the light zone 121 whole because of diffraction the inhomogeneous phenomenon dispersion of light distribution that leads to different positions diffraction seam 122, get into the light of light zone 121 in the light of light zone when having avoided not setting up diffraction seam 122 in the light of light zone 122 the light diffraction degree of difference great problem, greatly improved the holistic degree of consistency of light behind the light zone 121 of income to guarantee that light has good imaging quality.
Further, since the light beam emitted from the light source 130 is concentrated in the middle portion, it can be understood that the brightness of the light beam in the middle portion of the light incident region 121 is greater when the light beam passes through the light incident region 121. Therefore, referring to fig. 2, in order to ensure that light has sufficient brightness to form a clear image after passing through the light incident region 121, the distribution pattern of the light incident region 121 is designed such that the area of the diffraction slit 122 gradually decreases in a direction in which the geometric center of the light incident region 121 points to the edge portion of the light incident region 121. Accordingly, a large amount of light passes through the middle portion of the light incident region 121, and the light passing through the light incident region 121 has high brightness as a whole while maintaining the uniformity of the light as a whole, thereby forming a clear and high-quality image on the light sensing surface 141.
It should be noted that when the area of the diffraction slit 122 is gradually decreased in a direction in which the geometric center of the light incident region 121 points to the edge of the light incident region 121, the diffraction degree of the light transmitted through different portions of the light incident region 121 is also different due to the different sizes of the diffraction slit 122 in different portions of the light incident region 121. The light transmitted through the middle portion of the light incident region 121 is diffracted to a lower degree due to the larger diffraction slit 122, and the light transmitted through the edge portion of the light incident region 121 is diffracted to a higher degree due to the smaller diffraction slit 122, which results in the overall uniformity of the light transmitted through the light incident region 121 being lowered. Therefore, the specific design of the distribution pattern of the light incident region 121 needs to be selected according to actual conditions, and when the requirement for the imaging quality is high, the area difference between the diffraction slit 122 at the middle part and the diffraction slit 122 at the edge part of the light incident region 121 can be reduced appropriately, so that the overall uniformity of the light transmitted through the light incident region 121 is higher. When the overall brightness of the light transmitted through the light incident region 121 is required to be relatively high, the area of the diffraction slit 122 in the middle portion of the light incident region 121 may be increased appropriately, so that the overall brightness of the light transmitted through the light incident region 121 is sufficient.
The distribution pattern of the light incident region 121 is not limited, and may be selected according to the actual application environment. It should be noted that, in the present application, the plurality of diffraction slits 122 are disposed in the light incident region 121, which does not mean that the diffraction slits 122 are necessarily independent from each other, and in some embodiments, the plurality of diffraction slits 122 may also communicate with each other.
Specifically, referring to fig. 3 and 4, in some embodiments, the plurality of diffraction slits 122 communicate with each other to form a spiral stripe in a direction in which the geometric center of the light incident area 121 points to the edge of the light incident area 121. At this time, it can be understood that light transmitted through the light incident region 121 from different portions of the light incident region 121 is diffracted in different slits. Moreover, since the plurality of diffraction slits 122 are communicated with each other, in some embodiments, in the extending direction of the spiral stripe from inside to outside, the slit included by one unit of extending length may be regarded as one diffraction slit 122, and the plurality of diffraction slits 122 are sequentially communicated to form the spiral stripe. In addition, in the embodiment of fig. 3, the plurality of diffraction slits 122 are communicated with each other to form one spiral stripe, and in the embodiment of fig. 4, the plurality of diffraction slits 122 are communicated with each other to form two interlaced spiral stripes. It is understood that, when the areas of the light incident regions 121 are the same, and the distribution pattern in the embodiment shown in fig. 3 is adopted, the area difference between the diffraction slits 122 in the middle portion and the diffraction slits 122 in the edge portion of the light incident regions 121 is larger, and at this time, the overall brightness of the light transmitted through the light incident regions 121 is higher. With the distribution pattern in the embodiment shown in fig. 4, the area difference between the diffraction slit 122 in the middle portion and the diffraction slit 122 in the edge portion of the light incident area 121 is smaller, and the light penetrating through the light incident area 121 has higher overall uniformity.
In addition, referring to fig. 5, in some embodiments, the portion of the mask layer 120 in the light incident area 121 is formed by a plurality of light-shielding spots 123 spaced apart from each other, and the light-shielding spots 123 are uniformly distributed along the circumferential direction of the light incident area 121. Also, the area of the light-shielding spot 123 gradually decreases in a direction in which the geometric center of the light incident area 121 points to the edge of the light incident area 121. The light shielding spots 123 serve to shield light, and it can be understood that at this time, mutually communicated diffraction slits 122 are formed between the light shielding spots 123, and the area of the diffraction slits 122 gradually decreases in a direction in which the geometric center of the light incident area 121 points to the edge of the light incident area 121. Specifically, in some embodiments, a space surrounded by a plurality of light shielding spots 123 uniformly distributed along the circumferential direction of the light incident area 121 in the middle of the light incident area 121 may be regarded as a diffraction slit 122, and a space surrounded by a fixed number of adjacent light shielding spots 123 in a direction in which the geometric center of the light incident area 121 points to the edge of the light incident area 121 may be regarded as a different diffraction slit 122. Of course, the number of the light-shielding spots 123 and the distance between the adjacent light-shielding spots 123 can be adjusted according to actual conditions, and when the overall brightness of the light transmitted through the light incident region 121 is required to be high, the distance between the adjacent light-shielding spots 123 in the middle portion can be made larger, even if the area of the diffraction slit 122 in the middle portion is larger. When the overall uniformity of the light transmitted through the light incident region 121 is required to be high, the number of the light shielding spots 123 can be correspondingly increased, and the distance between the adjacent light shielding spots 123 is smaller.
Further, referring to fig. 6 and 7, in some embodiments, the diffraction slits 122 may be independent from each other, in which case, each diffraction slit 122 may be regarded as a slit or a small hole, and light transmitted through different portions of the light incident region 121 is diffracted in different diffraction slits 122. Referring to fig. 6, in some embodiments, the distribution pattern of the light incident region 121 may be approximately formed by a plurality of concentric circles sequentially arranged from inside to outside, and the interval regions of the plurality of concentric circles are divided by a plurality of horizontal shading lines uniformly distributed in the vertical direction in the figure to form a plurality of independent light-transmitting spaces, and each light-transmitting space may be regarded as a diffraction slit 122. Also, in the embodiment shown in fig. 6, the distribution pattern of the light incident area 121 is axisymmetrically distributed about two symmetry axes perpendicular to each other, one of the symmetry axes extending in the horizontal direction in the drawing and passing through the geometric center of the light incident area 121, and the other of the symmetry axes extending in the vertical direction in the drawing and passing through the geometric center of the light incident area 121.
Furthermore, when the overall uniformity of the light transmitted through the light incident area 121 is required to be higher, referring to fig. 7, the distribution pattern of the light incident area 121 may be approximately formed by two sets of concentric circles which are sequentially arranged from inside to outside and have mutually staggered centers, and a plurality of light-shielding lines which are uniformly distributed along the direction of the connection line of the centers of the two sets of concentric circles divide the interval region of the two sets of concentric circles into a plurality of light-transmitting spaces, each light-transmitting space may be regarded as a diffraction slit 122. It can be understood that when the areas of the light incident regions 121 are equal, and the area difference between the diffraction slit 122 located in the middle portion and the diffraction slit 122 located in the edge portion of the light incident region 121 is smaller in the embodiment shown in fig. 7 compared to the embodiment shown in fig. 6, the distribution pattern of the light incident regions 121 shown in fig. 7 is adopted, and the light transmitted through the light incident regions 121 is distributed more uniformly as a whole.
It is understood that when the light incident area 121 adopts different distribution patterns, the shape of the light incident area 121 should be selected differently. Specifically, in some embodiments, when the light incident area 121 adopts the distribution pattern in the embodiment shown in fig. 3, 4, or 5, the shape of the light incident area 121 may be a circle. In other embodiments, when the light incident area 121 adopts the distribution pattern of fig. 6 or fig. 7, the shape of the light incident area 121 may be rectangular. Of course, the distribution pattern of the light incident region 121 is not limited to the embodiments illustrated in the present application, and according to different practical application scenarios, the distribution pattern of the light incident region 121 may have other designs as long as the area of the diffraction slit 122 is gradually reduced in a direction in which the geometric center of the light incident region 121 points to the edge of the light incident region 121, so as to improve the uniformity of the light penetrating through the light incident region 121 as a whole, and ensure that the light has good imaging quality.
In addition, it is understood that in the present application, the substrate 110 should be made of a material with good light transmittance, and the opaque portion of the mask layer 120 should be made of an opaque material. So that the light can enter the substrate 110 through the light incident surface 111 through the light incident region 121 and exit from the light exiting surface 112 to reach the light sensing surface 141 of the light sensing element 140. Specifically, in some embodiments, the substrate 110 may be made of glass or Polyimide (PI) film. The mask layer 120 may be made of an opaque plastic material. In some embodiments, the mask layer 120 may be formed on the light incident surface 111 of the substrate 110 by spraying or the like.
Referring to fig. 1 and fig. 2 again, in some embodiments, the light source 130 may be disposed in a plurality, and the plurality of light sources 130 are distributed on two sides of the light incident region 121. Of course, the number and the installation position of the light sources 130 are not limited, in other embodiments, a plurality of light sources 130 may also be disposed around the light incident region 121, as long as the light emitted from the light sources 130 to the object to be measured can be reflected by the object to be measured and forms a clear image on the light sensing surface 141 after passing through the mask layer 120 and the substrate 110. Moreover, in some embodiments, the light sources 130 are arranged in a regular matrix on two sides of the light incident area 121 or around the light incident area 121, so that the light sources 130 can supplement light to each other, and the overall brightness distribution of the light can be more uniform while ensuring that the light emitted from the optical module 100 to the object to be measured has sufficient brightness. More specifically, in some embodiments, the Light emitted from the Light source 130 is infrared Light, in which case, the Light source 130 may employ an infrared Light Emitting Diode (LED), and the infrared LED may be mounted on the Light Emitting surface 131 in a chip form.
It is understood that in some embodiments, the optical module 100 and the photosensitive element 140 may be combined to form an electronic device (not shown), and the electronic device has a function of tracking and imaging the motion of the object to be measured. In particular, in some embodiments, the electronic device may be used for tracking imaging of the movement of a human eye or for tracking imaging of human hand motion. It should be noted that, when the electronic device is used for tracking the movement of the human eyeball, in the electronic device, two optical modules 100 may be provided, the light incident surface 111 of one optical module 100 faces to a corresponding human eyeball, two light sensing elements 140 are also provided, and the light sensing surface 141 of one light sensing element 140 faces to the light emitting surface 112 of a corresponding optical module 100. Moreover, the electronic device may further include an operation module (not shown) configured to perform operation analysis on the image received by the photosensitive surface 141 of the photosensitive element 140 to obtain a motion state of the object to be measured. More specifically, the electronic device may be a VR device, an AR device or an MR device.
The optical module 100 is adopted in the electronic device, and due to the structural design of the optical module, the size of the optical module is smaller, and the requirement of miniaturization design of the electronic device can be met. Meanwhile, due to the distribution pattern design of the light incident region 121, the overall uniformity of the light penetrating through the light incident region 121 is higher, and the image quality of the light formed on the photosensitive surface 141 is higher. It can be understood that, with the optical module 100, the image formed by the light beam on the photosensitive surface 141 has a higher degree of reduction on the object to be measured, thereby reducing the requirement of the photosensitive element 140 on the resolution of the image. Therefore, the light sensing element 140 can be a CMOS device with a low image resolution, so as to achieve the effects of saving power and reducing production cost.
In the optical module 100, the substrate 110 and the mask layer 120 are used to replace a conventional lens set, thereby greatly reducing the size of the optical module 100. Meanwhile, the light source 130 is disposed on the light emitting surface 131 of the substrate 110, and an additional carrier is not required to mount the light source 130, so that the size of the optical module 100 can be further reduced to meet the requirement of miniaturization design of electronic devices. In addition, the light incident region 121 formed by the plurality of diffraction slits 122 is disposed on the mask layer 120, and in a direction in which the geometric center of the light incident region 121 points to the edge of the light incident region 121, the area of the diffraction slits 122 is gradually reduced, so that light rays incident to different parts of the light incident region 121 can be independently diffracted, and the brightness of light rays penetrating through the middle part of the light incident region 121 is high, thereby ensuring that the light rays have high uniformity and sufficient brightness to image after passing through the mask layer 120, and further ensuring that the optical module 100 has good imaging quality after being reduced in size.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An optical module, comprising:
a substrate having a light incident surface;
the mask layer is arranged on the light incoming surface, a plurality of diffraction slits are arranged on the mask layer to form a light incoming area, and the area of each diffraction slit is gradually reduced in the direction that the geometric center of the light incoming area points to the edge of the light incoming area; and
the light source is provided with a light emitting surface, the light source is arranged on the light incoming surface and is separated from the light incoming surface, and the light emitting surface deviates from the light incoming surface.
2. The optical module according to claim 1, wherein the plurality of light sources are distributed on two sides of the light incident area; or
The light sources are arranged in a plurality of numbers, and the light sources are arranged around the light incoming area.
3. The optical module of claim 1 wherein the plurality of diffraction slits are independent of or in communication with each other.
4. The optical module of claim 1, wherein the plurality of diffraction slits are interconnected to form a spiral stripe in a direction from a geometric center of the light entrance area to an edge of the light entrance area.
5. The optical module of claim 4 wherein the plurality of diffraction slots are interconnected to form a spiral stripe; or
The plurality of diffraction slits are communicated with each other to form two mutually staggered spiral-shaped stripes.
6. The optical module of claim 1, wherein the portion of the mask layer located in the light incident area is formed by a plurality of light-shielding spots spaced apart from each other, the light-shielding spots are uniformly distributed along a circumferential direction of the light incident area, and an area of the light-shielding spots gradually decreases in a direction in which a geometric center of the light incident area points to an edge of the light incident area.
7. The optical module of claim 1, wherein the light entrance region has at least one axis of symmetry, the axis of symmetry passing through a geometric center of the light entrance region, and the diffraction slits are distributed axisymmetrically about the axis of symmetry.
8. The optical module of claim 7, wherein the light entrance region has two axes of symmetry, the two axes of symmetry being perpendicular to each other.
9. An electronic device, comprising a light-sensitive element and the optical module of any one of claims 1-8, wherein the surface of the substrate opposite to the light-incident surface is the light-emitting surface of the substrate, the light-sensitive element has a light-sensitive surface, the light-sensitive element is disposed on one side of the substrate departing from the light-incident surface, and the light-sensitive surface faces the light-emitting surface.
10. The electronic device according to claim 9, wherein there are two optical modules, the light incident surface of one of the optical modules is used for receiving light reflected by a corresponding one of the human eyeballs, and there are two light sensing elements, and the light sensing surface of one of the light sensing elements faces the light emitting surface of a corresponding one of the optical modules.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983803A (en) * | 2020-08-19 | 2020-11-24 | 业成科技（成都）有限公司 | Eyeball tracking module and electronic equipment |
| CN112630967A (en) * | 2020-12-23 | 2021-04-09 | 业成科技（成都）有限公司 | Optical waveguide module and electronic equipment |
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