Projection device, wide-angle lens thereof, and wide-angle projection method
By incorporating collimating lens groups, diffractive optical elements, and adjustment lens groups into a wide-angle lens, the requirements for a large field of view, miniaturization, and high resolution are addressed. This achieves optical distortion control and spot stability over a wide projection angle, satisfying the diverse applications of wide-angle lenses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-03-10
AI Technical Summary
Existing wide-angle lenses cannot simultaneously meet the requirements of a large field of view, miniaturization, and high resolution, resulting in excessive deformation of the structured light spot or failure due to overlapping diffraction light.
It adopts a wide-angle lens design that includes a collimating lens group, diffractive optical elements and an adjustment lens group. It uses diffractive optical elements to replicate and expand the projected light into multiple diffractive beams, control optical distortion and avoid spot deformation and diffraction beam crossover.
It achieves output light with a wide projection angle range while controlling the overall optical distortion within an effective range, avoiding light spot deformation and diffraction light interlacing, and realizing lens miniaturization and high resolution.
Smart Images
Figure CN121634663A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to optical lenses, and more particularly to a projection device, its wide-angle lens, and a wide-angle projection method. Background Technology
[0002] A wide-angle lens is a lens with a short focal length and a wide angle of view. Its large field of view makes it widely used in the camera and / or projection devices of various electronic products. Summary of the Invention
[0003] However, in response to different application needs, wide-angle lenses not only need to continuously develop towards a large field of view, but also need to have the characteristics of miniaturization and high resolution. Therefore, it is necessary to develop a new architecture for wide-angle lenses that can simultaneously meet the requirements of a large field of view, miniaturization and high resolution.
[0004] In some embodiments, a projection device includes: a light source module, a collimating lens group, a diffractive optical element (DOE), and an adjustment lens group. The light source module is used to emit at least one projected light. The collimating lens group is disposed corresponding to the light source module and is used to collimate the at least one projected light into at least one collimated light. The diffractive optical element is disposed corresponding to the collimating lens group and is used to replicate the at least one collimated light into multiple diffracted beams. The adjustment lens group is disposed corresponding to the diffractive optical element and is used to expand and adjust the multiple diffracted beams to output multiple output beams.
[0005] In some embodiments, in the projection device, the light source module, collimating lens group, diffractive optical element and adjustment lens group have the same optical axis.
[0006] In some embodiments, in the projection device, the diffraction order of the diffraction optical element is ±N, where N is a positive integer.
[0007] In some embodiments, in the projection device, the light source module includes M light-emitting units, and the diffractive optical element outputs multiple diffracted beams arranged in an M×(2N+1) pattern, where M is a positive integer.
[0008] In some embodiments, in the projection device, the light source module includes a single light-emitting unit.
[0009] In other embodiments, the light source module in the projection device includes multiple light-emitting units.
[0010] In some embodiments, the multiple output beams in the projection device are randomly configured.
[0011] In other embodiments, the multiple output beams are configured as an array in the projection device.
[0012] In some embodiments, a wide-angle lens includes: a collimating lens group, a diffractive optical element, and an adjustment lens group. The diffractive optical element is disposed corresponding to the collimating lens group. The adjustment lens group is disposed corresponding to the diffractive optical element. The collimating lens group, the diffractive optical element, and the adjustment lens group are arranged sequentially from one side of the wide-angle lens to the other side.
[0013] In some embodiments, in a wide-angle lens, the collimating lens group, the diffractive optical element, and the adjustment lens group have the same optical axis.
[0014] In some embodiments, in a wide-angle lens, the diffraction order of the diffraction optical element is ±N, where N is a positive integer.
[0015] In some embodiments, the wide-angle lens further includes a photosensitive element, and the photosensitive element and the diffractive optical element are respectively disposed on opposite sides of the collimating lens group.
[0016] In some embodiments, a wide-angle projection method includes: emitting at least one projection light; collimating the at least one projection light into at least one collimated light; causing the at least one collimated light to produce a diffraction phenomenon to replicate the at least one collimated light into multiple diffracted lights; and expanding and trimming the multiple diffracted lights to form multiple outputs.
[0017] In summary, the projection device, its wide-angle lens, and wide-angle projection method of any embodiment provide output light (i.e., light array or random light spot) with a large projection angle range through the built-in diffractive optical element of the wide-angle lens, while also controlling the overall optical distortion within an effective specification, that is, it will not cause excessive deformation of the structured light spot and / or failure phenomenon of overlapping diffraction light of different orders.
[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the projection device in some embodiments.
[0020] Figure 2 In order to be in Figure 1 In an example of a projection device, the light spot distribution of the light-emitting unit of the light source module 14 is shown.
[0021] Figure 3 In order to be in Figure 1 In an example of a projection device, the light spot distribution pattern of the light array is shown.
[0022] Figure 4 for Figure 3 The horizontal cross-sectional distribution of the diffraction order intensity of the light spot.
[0023] Figure 5 for Figure 3 The horizontal cross-sectional distribution of the logarithmic intensity of the light spot.
[0024] Figure 6 for Figure 3 The vertical cross-sectional distribution of the logarithmic intensity of the light spot.
[0025] Figure 7 In order to be in Figure 1 In another example of a projection device, the light spot distribution pattern of the light array is shown.
[0026] Figure 8 for Figure 7 The horizontal cross-sectional distribution of the logarithmic intensity of the light spot.
[0027] Figure 9 for Figure 7 The vertical cross-sectional distribution of the logarithmic intensity of the light spot.
[0028] Figure 10 In order to be in Figure 1 In another example of a projection device, the light spot distribution pattern of the light array is shown.
[0029] Figure 11 for Figure 7 The horizontal cross-sectional distribution of the logarithmic intensity of the light spot.
[0030] Figure 12 for Figure 7 The vertical cross-sectional distribution of the logarithmic intensity of the light spot.
[0031] In the attached figures, the following labels are used:
[0032] 10: Projection device; 12: Wide-angle lens; 12a: First side; 12b: Second side; 121: Collimating lens group; 123: Diffractive optical element; 125: Adjustment lens group; 121a, 121b, 125a, 125b: Lenses; 14: Light source module; X, Y, Z: Directions; O1: Optical axis Detailed Implementation
[0033] Reference Figure 1 A wide-angle lens 12 includes: a collimating lens group 121, a diffractive optical element (DOE) 123, and an adjustment lens group 125. The diffractive optical element 123 is disposed corresponding to the collimating lens group 121. The adjustment lens group 125 is disposed corresponding to the diffractive optical element 123. The collimating lens group 121, the diffractive optical element 123, and the adjustment lens group 125 are arranged sequentially from a first side 12a to a second side 12b of the wide-angle lens 12.
[0034] In some embodiments, the collimating lens group 121 includes at least one lens 121a, 121b. In some embodiments, the collimating lens group 121 may be composed of a plurality of lenses 121a, 121b.
[0035] In some embodiments, the diffraction order of the diffraction optical element 123 is ±N, where N is a positive integer. In some embodiments, the diffraction optical element 123 may be, for example, a grating lens or a meta-lens.
[0036] In some embodiments, the adjustment lens group 125 includes at least one lens 125a, 125b. In some embodiments, the adjustment lens group 125 may be composed of a plurality of lenses 125a, 125b.
[0037] In some embodiments, the collimating lens group 121, the diffractive optical element 123, and the adjustment lens group 125 have the same optical axis O1.
[0038] In some embodiments, the wide-angle lens 12 may be applied to the projection device 10 or to a camera device. In some examples, when applied to the projection device 10, the first side 12a of the wide-angle lens 12 is the light-incident side, and the second side 12b of the wide-angle lens 12 is the light-outcident side. In other examples, when applied to a camera device, the first side 12a of the wide-angle lens 12 is the image side, and the second side 12b of the wide-angle lens 12 is the object side.
[0039] Specifically, taking the projection device 10 as an example, the projection device 10 includes: a wide-angle lens 12 and a light source module 14 as described in any of the preceding embodiments. The collimating lens group 121 is configured corresponding to the light source module 14.
[0040] Here, the light source module 14 is located on the light-incident side (first side 12a) of the wide-angle lens 12 and is used to emit at least one projected light toward the wide-angle lens 12. The collimating lens group 121 is used to receive the projected light from the light source module 14 and collimate the received projected light into at least one collimated light. The diffractive optical element 123 is used to receive the collimated light from the collimating lens group 121 and replicate the received collimated light into multiple diffracted beams. The adjusting lens group 125 is used to receive the diffracted light from the diffractive optical element 123, and then expand and trim the received diffracted light to output multiple output beams. In some embodiments, the multiple output beams may be randomly configured. In other embodiments, the multiple output beams may be arrayed into a light array.
[0041] In some embodiments, the light source module 14, the collimating lens group 121, the diffractive optical element 123, and the adjustment lens group 125 are arranged sequentially at intervals and their central axes (i.e., optical axes O1) overlap.
[0042] It should be clear that when the wide-angle lens 12 is applied to a camera device, Figure 1The light source module 14 shown is replaced by a photosensitive element. In other words, the photosensitive element and the diffractive optical element 123 are respectively disposed on opposite sides of the collimating lens group 121.
[0043] In some embodiments, the light source module 14 may be composed of a single light-emitting unit and its driving circuit. The single light-emitting unit may be, for example, an edge-emitting laser or a vertical-cavity surface-emitting laser (VCSEL) element. For instance, taking the light source module 14 as an edge-emitting laser, the projected light output from the light source module 14 passes through the collimating lens group 121 to form a collimated light, which then passes through the diffractive optical element 123 to form a pattern (or random spot). Finally, this pattern (or random spot) is expanded and refined by the adjusting lens group 125 before being output.
[0044] In other embodiments, the light source module 14 may be composed of multiple light-emitting units and their driving circuits. In some embodiments, the multiple light-emitting units may be arranged in an array to form a light-emitting array, and this light-emitting array may be a linear array light source or a surface array light source. The light source module 14 may, for example, be a VCSEL array.
[0045] In some embodiments, the diffractive optical element 123 may be a one-dimensional or two-dimensional diffractive element. In some embodiments, taking a one-dimensional diffractive optical element 123 as an example, assuming the diffraction order of the diffraction optical element 123 is ±N and the light source module 14 has M light-emitting units, the diffractive optical element 123 outputs diffracted light arranged in an M×(2N+1) pattern. Here, M and N are both positive integers greater than or equal to 1.
[0046] For example, the diffraction order of the diffraction optical element 123 is ±1, and the light source module 14 is a surface array light source composed of 5×7 light-emitting units; at this time, the diffraction optical element 123 will output diffracted light arranged in 5×7×3.
[0047] Specifically, in one example, the wide-angle lens 12 in the projection device 10 is a five-element type. The collimating lens group 121 consists of two lenses 121a and 121b, and the adjusting lens group 125 also consists of two lenses 125a and 125b. Lenses 125a and 125b, the diffractive optical element 123, lenses 121a and 121b, and the light source module 14 are arranged sequentially and at intervals in the Z direction. The optical parameters of each component in the projection device 10 are shown in Table 1.
[0048] Table 1
[0049] R(mm) Thickness (mm) η V K 125a -3.97649 0.35000 1.54 56 -41.1728 interval 1.86376 2.36554 Air -0.3623 125b -1.98846 0.33941 1.54 56 3.4247 interval -1.48037 0.34972 Air 0.1335 123 Infinity 0.35000 1.52 64 0.0000 interval Infinity 1.03219 Air 0.0000 121a 2.14797 0.90000 1.52 56 0.0000 interval -1.45716 0.23233 Air 0.0000 121b 1.19731 0.53714 1.75 50 -0.6426 interval 1.24711 0.65476 Air -0.2360 14 Infinity 0.00000
[0050] In Table 1, R represents the radius of curvature of the lens, η represents the refractive index of the lens, V represents the Abbe number of the lens, and K represents the extinction coefficient of the lens.
[0051] Therefore, the light source module 14 can be a VCSEL array consisting of 5×7 laser elements arranged in an array on the XY plane, and its output effect is as follows: Figure 2 As shown. This 5-element wide-angle lens (12) can produce the following results: Figure 3 The light array shown. Here, the grid TV distortion of this wide-angle lens 12 is 4.76%.
[0052] Depend on Figure 3 It is evident that this projection device 10 (or its wide-angle lens 12) can effectively control overall optical distortion. (Refer to...) Figure 4 As can be seen from the linear intensity distribution, this projection device 10 (or its wide-angle lens 12) can clearly separate three diffraction orders in the spatial domain, and each order has identifiable intensity differences and symmetry; thus, it can be concluded that this projection device 10 (or its wide-angle lens 12) possesses a high degree of directionality and energy control capability. Furthermore, referring to... Figure 5 The energy distribution along the X direction is presented on a logarithmic scale (corresponding to...). Figure 4 When the coordinate in the Y direction is 0, it can be seen that significant interference oscillations occur in the central region (approximately -36 degrees to +36 degrees), while the edge region shows rapid attenuation. Therefore, it can be concluded that the horizontal diffraction angle of this projection device 10 (or its wide-angle lens 12) is ~36 degrees, and it possesses spatial energy concentration and background suppression capabilities. (Refer to...) Figure 6 When the energy distribution in the Y direction is presented on a logarithmic scale (i.e., the position with coordinate 0 in the X direction), it can be seen that a clear plateau is formed in the central region (approximately -18 degrees to +18 degrees) accompanied by periodic oscillations; thus, it can be known that the vertical distribution angle of this projection device 10 (or its wide-angle lens 12) is ~18 degrees, and it also has interference control and energy concentration in the vertical direction.
[0053] In another example, the light source module 14 is replaced with a VCSEL array of laser elements arranged in an array with a spacing of 0.046 mm in the X direction and 0.051 mm in the Y direction, while other conditions remain the same as in the aforementioned example. In this case, the output from the projection device 10 (or its wide-angle lens 12) is as follows: Figure 7 The light array shown. Here, the optical distortion of this wide-angle lens 12 is approximately 18%. Furthermore, referring to... Figure 8 and Figure 9 As can be seen from the logarithmic intensity distribution diagram, the horizontal diffraction angle of this projection device 10 (or its wide-angle lens 12) is ~45 degrees, and its vertical diffraction angle is ~18 degrees.
[0054] In another example, the light source module 14 is again replaced with a VCSEL array of laser elements arranged in an array with a spacing of 0.051 mm in the X direction and 0.057 mm in the Y direction, while other conditions remain the same as in the previous example. In this case, the output from the projection device 10 (or its wide-angle lens 12) is as follows: Figure 10 The light array shown. And, referring to... Figure 11 and Figure 12 As can be seen from the logarithmic intensity distribution diagram, the horizontal diffraction angle of this projection device 10 (or its wide-angle lens 12) is ~43 degrees, and its vertical diffraction angle is ~20 degrees.
[0055] In summary, the projection device, its wide-angle lens, and wide-angle projection method of any embodiment provide output light (i.e., light array or random light spot) with a large projection angle range through the diffractive optical element 123 built into the wide-angle lens 12, while controlling the overall optical distortion within an effective range, i.e., preventing excessive deformation of the structured light spot and / or failure due to overlapping of diffracted light of different orders. In some embodiments, the projection device, its wide-angle lens, or wide-angle projection method can be implemented with a 5-lens assembly, which can effectively miniaturize the overall structure while still maintaining good optical performance.
[0056] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.
Claims
1. A projection device, characterized by comprising: a light source module configured to emit at least one projection light; a collimating lens group disposed corresponding to the light source module, configured to collimate the at least one projection light into at least one collimated light; a diffractive optical element disposed corresponding to the collimating lens group, configured to replicate the at least one collimated light into a plurality of diffracted lights; and an adjusting lens group disposed corresponding to the diffractive optical element, configured to expand and trim the plurality of diffracted lights to output a plurality of output lights.
2. The projection device of claim 1, wherein wherein the light source module, the collimating lens group, the diffractive optical element and the adjusting lens group have the same optical axis.
3. The projection apparatus of claim 1, wherein wherein the diffractive optical element has a diffraction order of ±Nth order, and the N is a positive integer.
4. The projection apparatus of claim 3, wherein wherein the light source module comprises M light emitting units, and the diffractive optical element outputs M×(2N+1) arranged plurality of diffracted lights, and the M is a positive integer.
5. The projection apparatus of claim 1, wherein wherein the light source module comprises a single light emitting unit.
6. The projection apparatus of claim 1, wherein wherein the light source module comprises a plurality of light emitting units.
7. The projection apparatus of claim 1, wherein wherein the plurality of output lights are randomly arranged.
8. The projection apparatus of claim 1, wherein wherein the plurality of output lights are arrayed.
9. A wide-angle lens characterized by comprising: comprising: a collimating lens group; a diffractive optical element disposed corresponding to the collimating lens group; and an adjusting lens group disposed corresponding to the diffractive optical element, wherein the collimating lens group, the diffractive optical element and the adjusting lens group are sequentially arranged from one side of the wide-angle lens to the other side of the wide-angle lens. wherein the collimating lens group, the diffractive optical element and the adjusting lens group have the same optical axis.
10. The wide-angle lens of claim 9, wherein, wherein the diffractive optical element has a diffraction order of ±Nth order, and the N is a positive integer.
11. The wide-angle lens of claim 9, wherein further comprising:
12. The wide-angle lens of claim 9, wherein, a photosensitive element disposed corresponding to the diffractive optical element on opposite sides of the collimating lens group. comprising:
13. A wide-angle projection method characterized by comprising: emitting at least one projection light; collimating the at least one projection light into at least one collimated light; causing the at least one collimated light to diffract to replicate the at least one collimated light into a plurality of diffracted lights; and expanding and trimming the plurality of diffracted lights to form a plurality of output lights.