TW202028810A - Optical device - Google Patents

Abstract

An optical device including a Vertical-Cavity Surface-Emitting Laser (VCSEL) light source and a lens array is provided. The VCSEL light source is configured to emit light with at least one light dot. The lens array is configured to receive light emitting from the VCSEL light source and then project a structured light. The structured light includes a dot pattern having number of light dots. Plural convex lenses are arranged along a first surface of the lens array. The convex lenses are configured to generate the light dots of the dot pattern.

Description

Optical device

The embodiment of the present disclosure relates to an optical device, and more particularly to an optical device for providing structured light with a specific pattern.

Structured light is light with a specific pattern. Structured light can be projected on one or more objects of interest. Then, the reflected light reflected by the object is sensed by one or more imaging sensors to generate a three-dimensional image for stereo image matching. The application of structured light has increased significantly, and related technologies have been extensively researched and developed.

A known structured light generating unit includes a multi-dots emitting light source, a projection lens and a diffractive optical element (DOE). However, due to the length of the back-focusing and projection lens Longer, the known structured light generating unit has poor space utilization. Another known structured light generating unit includes a light source, a hard mask and a projection lens. However, the hard mask will block part of the light emitted from the light source, so the efficiency of this known structured light generating unit Poor. Yet another known structured light generating unit includes an edge emitting laser, a collimator lens, and a diffractive optical element. However, the manufacturing process of the diffractive optical element is not easy to control, so The diffractive optical element has the problem of zero order power, which makes it easier for human eyes to have safety concerns. Yet another known structured light generating unit includes a multi-point emitting light source, a diffractive lens, and a diffractive optical element. However, the manufacturing process of making the diffractive lens and the diffractive optical element in the same element is quite strict, making This known structured light generating unit has poor diffraction efficiency.

The purpose of this disclosure is to provide an optical device that includes a Vertical-Cavity Surface-Emitting Laser (VCSEL) light source and a lens array. The vertical cavity surface emitting laser light source is used to emit light with at least one light spot. The lens array is used to receive the light emitted from the vertical cavity surface-emitting laser light source, thereby projecting structured light. The structured light includes a dot pattern with several light spots. A plurality of convex lenses are arranged along the first surface of the lens array, and the convex lenses are used to generate light spots with a dot pattern.

In some embodiments, a plurality of concave lenses are arranged along the second surface of the lens array, and the first surface and the second surface are opposite to each other; wherein the first surface corresponds to the light incident surface of the lens array, and the second surface corresponds to On the light-emitting surface of the lens array; the concave lens is used to increase the field of view (FOV) of the optical device.

In some embodiments, it is based on the divergence angle of the vertical cavity surface emitting laser source, the pitch of the vertical cavity surface emitting laser source, and the vertical cavity surface emitting laser The number of light points of the light source, the pitch of each convex lens, the ball height of each convex lens, the lens At least one of the substrate thickness of the array and the back focal length (BFL) between the vertical cavity surface-emitting laser source and the lens array determines the point pattern of the structured light.

In some embodiments, it is based on the divergence angle of the vertical cavity surface-emitting laser source, the pitch of the vertical cavity surface-emitting laser source, the number of spots of the vertical cavity surface-emitting laser source, The pitch of each concave lens, the ball height of each concave lens, the pitch of each convex lens, the ball height of each convex lens, the thickness of the substrate of the lens array, and between the vertical cavity surface emitting laser source and the lens array At least one of the back focal lengths to determine the dot pattern of the structured light.

In some embodiments, the arrangement of the spots of the vertical resonant cavity surface-emitting laser light source is designed according to the pitch of each convex lens, so as to determine the arrangement of the spots of the structured light pattern or increase the structured light The number of light spots of the dot pattern.

The purpose of this disclosure is to provide another optical device, including a vertical cavity surface-emitting laser light source, a lens array, and a diffractive optical element (DOE). The vertical cavity surface emitting laser light source is used to emit light with at least one light spot. The lens array is used to receive the light emitted from the vertical cavity surface-emitting laser light source, thereby providing patterned light with several light spots. The diffractive optical element is used to fan out the patterned light to project the structured light. The structured light includes a dot pattern with several light spots. Among them, the diffractive optical element is used to increase the field of view of the optical device and is used to generate light spots of a dot pattern. The number of light spots of the dot pattern is greater than the number of light spots of the pattern light.

In some embodiments, a plurality of convex lenses are arranged along the first surface of the lens array, and the convex lenses are used to generate light spots of patterned light.

In some embodiments, a plurality of concave lenses are arranged along the second surface of the lens array, and the first surface and the second surface are opposite to each other. The first surface corresponds to the light incident surface of the lens array, and the second surface corresponds to the light exit surface of the lens array. The concave lens is used to increase the visual field of the optical device.

In some embodiments, it is based on the divergence angle of the vertical cavity surface-emitting laser source, the pitch of the vertical cavity surface-emitting laser source, the number of spots of the vertical cavity surface-emitting laser source, At least one of the pitch of each convex lens, the ball height of each convex lens, the thickness of the substrate of the lens array, and the back focal length between the vertical cavity surface-emitting laser source and the lens array determine the point of structured light pattern.

In some embodiments, it is based on the divergence angle of the vertical cavity surface-emitting laser source, the pitch of the vertical cavity surface-emitting laser source, the number of spots of the vertical cavity surface-emitting laser source, The pitch of each convex lens, the ball height of each convex lens, the pitch of each concave lens, the ball height of each concave lens, the thickness of the substrate of the lens array, and between the vertical cavity surface-emitting laser source and the lens array At least one of the back focal lengths to determine the dot pattern of the structured light.

In some embodiments, the arrangement of the spots of the vertical resonant cavity surface-emitting laser light source is designed according to the pitch of each convex lens, so as to determine the arrangement of the spots of the structured light pattern or increase the structured light The number of light spots of the dot pattern.

In some embodiments, the structure of the diffractive optical element It is designed to scatter the pattern light, thereby determining the arrangement of the dot patterns of the structured light or increasing the number of the dot patterns of the structured light.

1‧‧‧The first group of light spots

2‧‧‧The second group of light spots

3‧‧‧The third group of light spots

100, 200‧‧‧Optical device

120, 220‧‧‧Vertical cavity surface-emitting laser light source

140、240‧‧‧lens array

142、242‧‧‧Glossy surface

144、244‧‧‧Glossy surface

180、280‧‧‧Plane

260‧‧‧Diffraction optical element

d, x12, y12, x13, y13‧‧‧distance

By reading the following detailed description of the embodiments and referring to the accompanying drawings below, the present disclosure can be understood more completely.

[Fig. 1] is a schematic diagram of the optical device according to the first embodiment of the present disclosure.

[Fig. 2] is a schematic diagram of an arrangement of light spots of the vertical cavity surface-emitting laser light source of the optical device according to the first embodiment of the disclosure.

[FIG. 3] is a schematic diagram of another arrangement of light spots of the vertical cavity surface-emitting laser light source of the optical device according to the first embodiment of the disclosure.

[Fig. 4] is a schematic diagram of the optical device according to the second embodiment of the present disclosure.

The following is a detailed description of the embodiments with the accompanying drawings, but the provided embodiments are not used to limit the scope of the present invention, and the description of the structure and operation is not used to limit the order of its execution, any recombination of components The structure and the devices with equal effects are all within the scope of the present invention. In addition, the drawings are for illustrative purposes only and are not drawn according to the original size.

FIG. 1 is a schematic diagram of an optical device 100 according to the first embodiment of the disclosure. The optical device 100 includes a vertical cavity surface-emitting laser (Vertical-Cavity Surface-Emitting Laser, VCSEL) light The source 120 and the lens array 140. The vertical cavity surface-emitting laser light source 120 is used to emit light toward the lens array 140. In the first embodiment of the disclosure, the vertical cavity surface-emitting laser light source 120 may be a single-point light source or a multi-point light source, such as a light source having 1×1 light points, 3×3 light points, or 9×9 light points.

The lens array 140 is used to receive the light emitted from the vertical cavity surface-emitting laser light source 120 to project structured light on the plane 180. The structured light includes a dot pattern with several light points used for specific purposes, such as three-dimensional (3D) sensing or stereo image matching. The number of light spots of the structured light point pattern is more than the number of light spots of the vertical cavity surface-emitting laser light source 120. The lens array 140 has two surfaces opposite to each other, namely the light incident surface 142 and the light output surface 144. The light incident surface 142 is closer to the vertical cavity surface emitting laser light source 120 than the light exit surface 144.

The multiple concave lenses are arranged along the light incident surface 142 of the lens array 140, and the multiple convex lenses are arranged along the light output surface 144 of the lens array 140. However, the first embodiment of the present disclosure is not limited to this. For example, the light incident surface 142 may be a flat surface and a plurality of convex lenses are arranged along the light output surface 144 of the lens array 140. For another example, a plurality of convex lenses are arranged along the light incident surface 142 of the lens array 140, and the light output surface 144 may be a flat surface.

It should be noted that the convex lens is a plurality of light spots used to generate a dot pattern of structured light. It should be noted that the concave lens is used to increase the field of view (FOV) of the optical device 100.

In the first embodiment of the present disclosure, when the lens array 140 has a concave lens and a convex lens arranged along two opposite surfaces of the lens array 140, the dot pattern of the structured light projected by the lens array 140 is based on the vertical The divergence angle of the resonant cavity surface-emitting laser source 120, the pitch of the vertical cavity surface-emitting laser source 120, the number of light points of the vertical cavity surface-emitting laser source 120, The pitch of each concave lens, the ball height of each concave lens, the pitch of each convex lens, the ball height of each convex lens, the thickness of the substrate of the lens array 140, the surface emitting laser light source 120 and the lens array between the vertical cavity It is determined by the back focal length (BFL) between 140 or a combination thereof. For example, when the back focal length between the vertical cavity surface-emitting laser light source 120 and the lens array 140 decreases, the field of view (FOV) of the optical device 100 increases accordingly, but the structured light points The number of light spots of the pattern is correspondingly reduced.

In the first embodiment of the present disclosure, when the lens array 140 has a flat surface and a non-flat surface, wherein the non-flat surface has convex lenses arranged along the non-flat surface, the structured light projected by the lens array 140 The dot pattern is based on the divergence angle of the vertical cavity surface-emitting laser source 120, the pitch of the vertical cavity surface-emitting laser source 120, the number of light points of the vertical cavity surface-emitting laser source 120, and each The pitch of the convex lenses, the spherical height of each convex lens, the thickness of the substrate of the lens array 140, the back focal length (BFL) between the vertical cavity surface-emitting laser source 120 and the lens array 140, or Combination to decide. For example, when the divergence angle of the vertical cavity surface-emitting laser light source 120 increases, the field of view (FOV) of the optical device 100 increases correspondingly, and the number of light points in the structured light point pattern is correspondingly increased. increase.

In the first embodiment of the disclosure, the arrangement of the light points of the vertical cavity surface-emitting laser light source 120 is designed to determine the point of the structured light The arrangement of the light spots of the pattern or increase the number of light spots of the structured light dot pattern. It should be noted that the arrangement of the light spots of the vertical cavity surface-emitting laser light source 120 is designed according to the pitch of each convex lens of the lens array 140.

2 is a schematic diagram of an arrangement of the light spots of the vertical cavity surface-emitting laser light source 120 of the optical device 100 according to the first embodiment of the disclosure. The vertical cavity surface-emitting laser light source 120 includes a first group of light spots, a second group of light spots, and a third group of light spots. The first group of light spots is the one circled by the symbol 1 in FIG. 2; The group of light spots is the circled with symbol 2 in Fig. 2; the third group of light spots is the circled with symbol 3 in Fig. 2. It should be noted that the distance d is the pitch of each convex lens of the lens array 140. As shown in Figure 2, the distance d+x ₁₂ represents the closest horizontal distance between the first group of light points and the second group of light points, and the distance y ₁₂ represents the closest horizontal distance between the first group of light points and the second group of light points The distance x ₁₃ represents the closest horizontal distance between the first group of light points and the third group of light points, and the distance d+y ₁₃ represents the closest vertical between the first group of light points and the third group of light points spacing.

3 is a schematic diagram of another arrangement of the light spots of the vertical cavity surface-emitting laser light source 120 of the optical device 100 according to the first embodiment of the disclosure. It should be noted that the distance d is the pitch of each convex lens of the lens array 140. As shown in Figure 3, the distance x ₁₂ represents the closest horizontal distance between the first group of light points and the second group of light points, and the distance y ₁₂ represents the first group of light points and the second group of light points. The closest vertical distance between two of the light spots, the distance x ₁₃ represents the closest horizontal distance between the first group of light spots and the third group of light spots, and the distance y ₁₃ represents the first group The closest vertical distance between a light spot and two of the third group of light spots. It should be noted that the arrangement of the light spots of the vertical resonant cavity surface-emitting laser light source 120 as shown in FIGS. 2 and 3 is designed to increase the irregularity of the dot pattern of the structured light, thereby reducing the identification of specific objects. Degree of difficulty.

FIG. 4 is a schematic diagram of an optical device 200 according to the second embodiment of the disclosure. The optical device 200 includes a vertical cavity surface emitting laser source 220, a lens array 240, and a diffractive optical element (DOE) 260. The vertical cavity surface-emitting laser light source 220 is used to emit light toward the lens array 240. In the second embodiment of the present disclosure, the vertical cavity surface-emitting laser light source 220 may be a single-point light source or a multi-point light source, such as a light source having 1×1 light points, 3×3 light points, or 9×9 light points.

The lens array 240 is used to receive the light emitted from the vertical cavity surface-emitting laser light source 220, so as to project patterned light with several light spots. The number of light spots of the pattern light is more than the number of light spots of the vertical cavity surface-emitting laser light source 220. The diffractive optical element 260 is used to fan out the patterned light, thereby projecting the structured light on the plane 280. The structured light includes a dot pattern with several light points used for specific purposes, such as three-dimensional (3D) sensing or stereo image matching. The number of light spots of the structured light dot pattern is greater than the number of light spots of the pattern light. The lens array 240 has two surfaces opposite to each other, namely the light incident surface 242 and the light output surface 244. The light incident surface 242 is closer to the vertical cavity surface emitting laser source 220 than the light exit surface 244.

A plurality of concave lenses are arranged along the light incident surface 242 of the lens array 240, and a plurality of convex lenses are arranged along the light exit surface 244 of the lens array 240. However, the second embodiment of the present disclosure is not limited to this. For example, the light-incident surface 242 can be a flat surface and a plurality of convex lenses are along the line of the lens array 240. The light emitting surface 244 is provided. For another example, a plurality of convex lenses are arranged along the light incident surface 242 of the lens array 240, and the light output surface 244 may be a flat surface.

It should be noted that the convex lens is a plurality of light spots used to generate a dot pattern of structured light. It should be noted that the concave lens is used to increase the field of view (FOV) of the optical device 100. It should be noted that the diffractive optical element 260 is used to increase the field of view of the optical device and to generate the light spots of the structured light spot pattern.

In the second embodiment of the present disclosure, the dot pattern of the structured light projected by the diffractive optical element 260 is based on the divergence angle of the vertical cavity surface-emitting laser light source 220 and the vertical cavity surface-emitting laser light source The pitch of 220, the number of light spots of the vertical cavity surface-emitting laser source 220, the pitch of each concave lens, the ball height of each concave lens, the pitch of each convex lens, the ball height of each convex lens, the lens The thickness of the substrate of the array 240, the back focal length between the vertical cavity surface-emitting laser source 220 and the lens array 240, or a combination thereof are determined.

In the second embodiment of the disclosure, the arrangement of the light spots of the vertical resonant cavity surface-emitting laser light source 220 is designed according to the pitch of each convex lens of the lens array 240 to determine the light pattern of the structured light. The arrangement of dots or increase the number of dots in the dot pattern of structured light.

In the second embodiment of the present disclosure, the structure of the diffractive optical element 260 is designed to scatter the pattern light, thereby determining the arrangement of the dot patterns of the structured light or increasing the dot pattern of the structured light quantity. For example, the diffractive optical element 260 can provide the scattering of patterned light to generate different diffraction orders, thereby increasing the structure. The number of light points of the light-constructed point pattern. Specifically, the diffractive optical element 260 can increase the density of the light spots of the structured light spot pattern.

In summary, this disclosure proposes an optical device including a vertical cavity surface emitting laser light source and a lens array, and this disclosure also proposes an optical device including a vertical cavity surface emitting laser light source, a lens array, and a diffractive optical element. The optical device proposed in the present disclosure is used to provide structured light including several light spots. The optical device proposed in this disclosure uses a lens array, which has a better space utilization rate. The optical device proposed in this disclosure uses a lens array and a diffractive optical element, so that it has lower energy loss.

The features of several embodiments are summarized above, so those who are familiar with the art can better understand the aspect of the disclosure. Those who are familiar with this art should understand that they can easily use the present disclosure as a basis to design or modify other processes and structures, thereby achieving the same goals and/or the same advantages as the embodiments described herein. . Those who are familiar with this art should also understand that these equivalent constructions do not depart from the spirit and scope of this disclosure, and they can make various changes, substitutions and alterations without departing from the spirit and scope of this disclosure.

200‧‧‧Optical device

220‧‧‧Vertical cavity surface-emitting laser light source

240‧‧‧lens array

242‧‧‧Glossy surface

244‧‧‧Glossy Surface

280‧‧‧Plane

260‧‧‧Diffraction optical element

Claims (12)

An optical device, comprising: a vertical cavity surface-emitting laser (Vertical-Cavity Surface-Emitting Laser, VCSEL) light source for emitting light with at least one spot; and a lens array for receiving the vertical cavity The light emitted by the resonant cavity surface-emitting laser light source projects a structured light, wherein the structured light includes a dot pattern with several light spots; wherein a plurality of convex lenses are along one of the lens arrays. The first surface is provided, and the convex lenses are used to generate the light spots of the dot pattern. According to the optical device described in claim 1, wherein a plurality of concave lenses are arranged along a second surface of the lens array, and the first surface and the second surface are opposite to each other; wherein the first surface corresponds to A light incident surface of the lens array and the second surface correspond to a light output surface of the lens array; wherein the concave lenses are used to increase the field of view (FOV) of the optical device. According to the optical device described in item 1 of the scope of patent application, it is based on a divergence angle of the vertical cavity surface-emitting laser light source and a pitch of the vertical cavity surface-emitting laser light source. ), the number of the light spots of the vertical resonant cavity surface-emitting laser light source, the pitch of each convex lens, and a ball of each convex lens At least one of the height (sag height), the thickness of a substrate of the lens array, and a back focal length (BFL) between the vertical cavity surface-emitting laser source and the lens array are determined The dot pattern of the structured light. The optical device described in item 2 of the scope of patent application is based on a divergence angle of the vertical cavity surface-emitting laser light source, a pitch of the vertical cavity surface-emitting laser light source, and the vertical cavity surface The number of the light spots of the laser light source, the pitch of each concave lens, the pitch of each concave lens, the pitch of each convex lens, the pitch of each convex lens At least one of the thickness of a substrate of the lens array and a back focal length between the vertical resonant cavity surface-emitting laser source and the lens array determines the dot pattern of the structured light. For the optical device described in item 1 of the scope of patent application, an arrangement of the light points of the vertical resonant cavity surface-emitting laser light source is designed according to the pitch of each convex lens, thereby determining the structure An arrangement of the light spots of the dot pattern of light or increase the number of the light spots of the dot pattern of the structured light. An optical device, comprising: a vertical cavity surface-emitting laser light source for emitting light with at least one light spot; a lens array for receiving surface-emitting laser light from the vertical cavity The light emitted by the source provides a patterned light with a number of light spots; and a diffractive optical element (DOE) to fan out the patterned light, Thus, a structured light is projected, wherein the structured light includes a dot pattern with a plurality of light spots, wherein the diffractive optical element is used to increase the field of view of the optical device and is used to generate the light spots of the dot pattern; wherein the The number of light spots of the dot pattern is greater than the number of light spots of the pattern light. In the optical device described in claim 6, wherein a plurality of convex lenses are arranged along a first surface of the lens array, and the convex lenses are used to generate the light spots of the pattern light. According to the optical device described in claim 7, wherein a plurality of concave lenses are arranged along a second surface of the lens array, and the first surface and the second surface are opposite to each other; wherein the first surface corresponds to A light-incident surface of the lens array and the second surface correspond to a light-exit surface of the lens array; wherein the concave lenses are used to increase the field of view of the optical device. The optical device described in item 7 of the scope of patent application, which is based on a divergence angle of the vertical cavity surface-emitting laser light source, a pitch of the vertical cavity surface-emitting laser light source, and the vertical cavity surface Shoot The number of the light spots of the type laser light source, the pitch of each of the convex lenses, the height of each of the convex lenses, the thickness of a substrate of the lens array, and the surface-emitting laser between the vertical cavity At least one of a back focal length between the light source and the lens array determines the dot pattern of the structured light. The optical device described in item 8 of the scope of patent application is based on a divergence angle of the vertical cavity surface-emitting laser light source, a pitch of the vertical cavity surface-emitting laser light source, and the vertical cavity surface The number of the light spots of the laser light source, the pitch of each convex lens, the pitch of each convex lens, the pitch of each concave lens, the pitch of each concave lens At least one of the thickness of a substrate of the lens array and a back focal length between the vertical resonant cavity surface-emitting laser source and the lens array determines the dot pattern of the structured light. For the optical device described in item 7 of the scope of patent application, an arrangement of the light points of the vertical cavity surface-emitting laser light source is designed according to the pitch of each of the convex lenses, thereby determining the structure An arrangement of the light spots of the dot pattern of light or increase the number of the light spots of the dot pattern of the structured light. The optical device described in item 6 of the scope of patent application, wherein a structure of the diffractive optical element is designed to scatter the pattern light, thereby determining an arrangement of the light spots of the dot pattern of the structured light Or increase the number of light points of the dot pattern of the structured light.

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