TWI608252B - Optical device - Google Patents

Description

Optical device

The present invention relates to an optical device, and more particularly to an optical device that can output structured light.

"Structure Light" refers to light having a specific form, such as a linearized beam, a striped pattern beam, a grid beam, and the like which are presented when light is projected onto a distant screen. With the development of optical technology, structured light can be designed to have a line shape with a narrow line width, a specific uniform surface morphology, a mesh shape with a specific wide angle, and even a more complex shape. In many fields, such as 3D contour reproduction, distance measurement, anti-counterfeiting identification. Therefore, structured light is gradually gaining attention, and its related technology has also been extensively studied.

Please refer to FIG. 1, which is a side view of the internal structure of a conventional structured light generating unit. The structured light generating unit 1 includes an illumination source 11, a collimating lens 12, and a Diffractive Optical Element (DOE) 13. The illumination source 11 can output a complex beam 111, and the collimating lens 12 is disposed on the illumination source 11 and the diffraction Between the optical elements 13, the function is to collimate the complex beam 111, causing the complex beam 111 to be incident on The optical element 13 is diffracted. The diffractive optical element 13 is embedded in a specific pattern (i.e., a projection pattern 131), and when the plurality of beams 111 are incident on the projection pattern 131, structured light is generated. Based on the diffraction theory, the function of the diffractive optical element 13 can be achieved and a new form of light can be formed by the synergistic or partially coordinated light interaction, whereby a rather complex pattern can be presented. When the complex beam 111 passes through the collimator lens 12 and passes through the projection pattern 131, the structured light generating unit 1 can output the structured light 110 corresponding to the projection pattern 131.

Next, the operation of the structured light generating unit 1 will be described. Please refer to FIG. 2 , which is a schematic side view showing the structure of the output light of the conventional structured light generating unit. The structured light generating unit 1 generates the structured light 110 in response to its internal structure, and when the light beam 111 of the structured light 110 is projected onto the projection surface 14, the projection surface 14 exhibits a structure corresponding to the structured light 110 due to the light beams 111. The light pattern 15, that is, the structured light pattern 15 corresponding to the projection pattern 131. The structured light pattern 15 is in a mesh form. As can be seen from FIG. 2, the structured light 110 output by the structured light generating unit 1 has a light diffusion angle θ, and the structured light 110 spreads as the distance traveled by the light beam 111 is further. Therefore, when the distance between the projection surface 14 and the structured light generating unit 1 is relatively short, the structured light pattern 15a presented on the projection surface 14 is small as shown in FIG. 3A. On the contrary, when the distance between the projection surface 14 and the structured light generating unit 1 is relatively long, the structured light pattern 15b presented on the projection surface 14 is large as shown in FIG. 3B.

Whether the structure light pattern is large or small is more appropriate depending on the user application context. The projected structured light pattern is usually required to have a higher quality. In other words, the efficiency from the incident beam to the converted structure light is high, and one of the keys is that the beam distribution (or spot) of the complex beam 111 output from the illumination source 11 is included on the projection pattern 131 of the diffractive optical element 13. The area should be effectively matched. Preferably, when the beam distribution of the complex beam 111 is slightly larger than or equal to the area of the projection pattern 131, the efficiency is the highest, that is, the beam distribution of the complex beam 111 is effectively matched with the diffractive optical element 13.

However, with the advancement of technology and the needs of users, the appearance of electronic devices must be thin and light in order to meet the requirements of users. Please refer to FIG. 4 , which is a side view showing the internal structure of different configurations of the conventional structured light generating unit. 4 shows a small-volume structured light generating unit 2 including a light-emitting source 21, a collimating lens 22, and a diffractive optical element 23. The structure and function of the structured light-generating unit 2 is substantially the same as that of the structured light-generating unit 1. The same is true, and the difference between the two is that the position of the collimator lens 22 is closer to the light source 21, and the thickness of the structured light generating unit 2 is smaller. Although the structured light generating unit 2 has a small thickness, the distance between the light source 21 and the collimator lens 22 is too small, so that the beam distribution of the plurality of beams 211 incident to the diffractive optical element 23 is small. At this time, in order to effectively match the beam distribution of the complex beam 211 with the diffractive optical element 23, the area of the diffractive optical element 23 must be designed to be small, and thus the resulting structured light pattern becomes small. In addition, the use of a small area of diffractive optics means that the assembly tolerance requirements for the device will be relatively high, which will increase the difficulty of assembly.

Accordingly, there is a need for an optical device having a thin and light volume and a beam profile of the beam that can be effectively matched to the diffractive optical element to produce a suitably sized structured light pattern.

It is an object of the present invention to provide an optical device that can be provided with a slim profile and that provides a structured light pattern of a suitable size.

Another object of the present invention is to provide an optical device that can be provided with a slim profile and whose beam profile of the beam can be effectively matched to the optical component of the structured light generating unit.

In a preferred embodiment, the present invention provides an optical device including a structured light generating unit, a conversion lens module, and a housing. The structured light generating unit is configured to output a structured light, the structured light generating unit includes at least one light emitting source and an optical component group (eg, a diffractive optical component), at least one light emitting source to generate a plurality of light beams, and the optical component group has a projection pattern, and the projection pattern is penetrated by the plurality of beams to output the structured light. The conversion lens module is located between the at least one illumination source and the optical component for expanding the plurality of beams, and the plurality of beams are projected through the conversion lens module to a projection surface, and the projection surface is presented on the projection surface a structured light pattern; wherein all of the conversion lenses in the conversion lens module have a negative refractive power. The collimating lens is disposed on one side of the conversion lens module for collimating the plurality of beams that are expanded. The housing is configured to receive the structured light generating unit, the conversion lens module, and the collimating lens.

In a preferred embodiment, the number of the conversion lenses in the conversion lens module is 1, and one of the optical axes of the conversion lens module is a straight line, and the refractive power of the conversion lens along the optical axis is negative. Its usual symbol is (-), and the refractive power of the collimating lens is positive.

In a preferred embodiment, the number of the conversion lenses in the conversion lens module is two, and one of the optical axes of the conversion lens module is a straight line. The refractive power of the lens from the at least one illumination source to the optical element group along the optical axis is negative and negative, and the conventional symbol is (-, -), and the refractive power of the collimating lens is positive.

In a preferred embodiment, the number of the conversion lenses in the conversion lens module is three, and one of the conversion lens modules has a linear axis, and the three conversion lens is from the at least one illumination source to the optical The refractive power of the component group along the optical axis is negative, negative, and negative, and the conventional symbol is (-, -, -), and the refractive power of the collimating lens is positive.

In a preferred embodiment, the conversion lens module includes a first conversion lens, a second conversion lens, and a third conversion lens. The first conversion lens is adjacent to the at least one illumination source for expanding the plurality of light beams, and the second conversion lens is located between the first conversion lens and the optical element group for reflecting the plurality of light beams. The third conversion lens is located between the first conversion lens and the optical element group for reflecting the complex light beam reflected by the second conversion lens; wherein the plurality of light beams are projected to the standard through the second conversion lens Straight lens.

In a preferred embodiment, the conversion lens module is a free lens group, and the optical axis of the conversion lens module is not a straight line, and the plurality of light beams incident on the optical component group and the optical component group The angle between one of the normal vectors is less than 5 degrees.

In a preferred embodiment, one of the first conversion lenses has a numerical aperture of less than 0.8, and the plurality of beams exhibit a rectangular distribution or an annular distribution.

In a preferred embodiment, the first conversion lens has a first numerical aperture of less than 0.6 in a vertical direction, and the first conversion lens has a second numerical aperture of less than 0.5 in a horizontal direction, and the complex number The beam exhibits a rectangular distribution or an annular distribution.

In a preferred embodiment, the first conversion lens is asymmetric to the optical axis, and the curvature of the first conversion lens in a horizontal direction is different from a curvature in a vertical direction to control the complex beam. Distribution and projection direction.

In a preferred embodiment, the collimating lens is asymmetric to the optical axis, and the curvature of the collimating lens in a horizontal direction is different from a curvature in a vertical direction to control the distribution of the complex beam and Projection direction.

In a preferred embodiment, at least one of the first conversion lens and the collimation conversion lens has a high anti-reflection coating, and at least one of the second conversion lens and the third conversion lens has a high reflection coating. To control the distribution of the complex beam and the direction of projection.

In a preferred embodiment, the optical device of the present invention further includes a spatial filter disposed between the collimating lens and the optical component group, or between the at least one illumination source and the conversion lens module. Used to filter the noise in the complex beam.

In a preferred embodiment, the optical component set includes at least one of a diffractive optical component, a refractive optical component, and a refractive array optical component corresponding to the structured light pattern.

In a preferred embodiment, the housing has a thickness of less than 4 mm.

In a preferred embodiment, the housing has a thickness of less than 6 mm.

In a preferred embodiment, the present invention further provides an optical device including a structured light generating unit, a conversion lens module, and a housing. The structured light generating unit is configured to output a structured light, the structured light generating unit includes at least one light emitting source and an optical component group, at least one light emitting source to generate a plurality of light beams, and the optical component group has a projection pattern, and the projection The pattern is penetrated by the complex beam and output The structured light. The conversion lens module is located between the at least one illumination source and the optical component for expanding the plurality of beams, and the plurality of beams are projected through the conversion lens module to a projection surface, and the projection surface is presented on the projection surface Structured light pattern. The collimating lens is disposed on one side of the conversion lens module for collimating the plurality of beams that are expanded. The housing is configured to receive the structured light generating unit, the conversion lens module and the collimating lens; wherein the thickness of the housing is less than 4 mm.

In a preferred embodiment, the number of the conversion lenses in the conversion lens module is 1, and one of the optical axes of the conversion lens module is a straight line, and the refractive power of the conversion lens along the optical axis is negative. The refractive power of the collimating lens is positive.

In a preferred embodiment, the number of the conversion lenses in the conversion lens module is two, and one of the conversion lens modules has a linear axis, and the two conversion lenses are from the at least one illumination source to the optical The refractive power of the component group along the optical axis is negative and negative, and the refractive power of the collimating lens is positive.

In a preferred embodiment, the number of the conversion lenses in the conversion lens module is three, and one of the conversion lens modules has a linear axis, and the three conversion lens is from the at least one illumination source to the optical The refractive power of the component group along the optical axis is negative, negative, and negative, and the refractive power of the collimating lens is positive.

In a preferred embodiment, the conversion lens module includes a first conversion lens, a second conversion lens, and a third conversion lens. The first conversion lens is adjacent to the at least one illumination source for expanding the plurality of light beams, and the second conversion lens is located between the first conversion lens and the optical element group for reflecting the plurality of light beams. The third conversion lens is located between the first conversion lens and the optical element group for reflecting the complex light beam reflected by the second conversion lens; wherein the plurality of light beams are projected to the standard through the second conversion lens Straight lens surface.

1, 2, 31, 41, 51, 61‧‧‧ structured light generating units

3, 4, 5, 6‧‧‧ optical devices

11, 21, 311, 411, 511, 611‧‧ ‧ illumination source

12, 22, 34, 44, 54, 64, 72‧‧ ‧ collimating lenses

13, 23‧‧‧Diffractive optical components

14, 35, 45, 56, 66‧‧‧ projection surface

15, 15a, 15b, 3151, 4151, 5151, 6151‧‧‧ structured light pattern

32, 42, 52, 62‧‧‧ conversion lens module

33, 43, 53, 63‧‧‧ shells

55, 65‧‧‧ Spatial Filter

110, 315, 415, 515, 615‧‧‧ structured light

111, 211, 313, 413, 513, 613 ‧ ‧ beams

131, 314, 414, 514, 614‧‧‧ projection patterns

312, 412, 512, 612‧‧‧ Optical component group

321, 421, 521, 621‧‧‧ first conversion lens

322, 422, 622‧‧‧ second conversion lens

323, 623‧‧‧ third conversion lens

A1, A2, A3, A4‧‧‧ optical axis

Θ‧‧‧dif angle

Figure 1 is a side elevational view of the internal structure of a conventional structured light generating unit.

Figure 2 is a side elevational view showing the structure of the output light of a conventional structured light generating unit.

3A-3B are schematic diagrams showing a structured light pattern generated by a structured light output unit at a different distance from a conventional structured light generating unit.

Figure 4 is a side elevational view of the internal structure of a different configuration of a conventional structured light generating unit.

Figure 5 is a side elevational view showing the structure of the optical device of the present invention in the first preferred embodiment.

Figure 6 is a side elevational view showing the structure of the optical device of the present invention in a second preferred embodiment.

Figure 7 is a side elevational view showing the structure of the optical device of the present invention in a third preferred embodiment.

Figure 8 is a side elevational view showing the structure of the optical device of the present invention in a fourth preferred embodiment.

Figure 9 is a side elevational view showing the structure of the optical device of the present invention in the fifth preferred embodiment.

In view of the problems of the prior art, the present invention provides an optical device that solves the problems of the prior art. Please refer to FIG. 5, which is a side view showing the structure of the optical device of the present invention in a first preferred embodiment. The optical device 3 includes a structured light generating unit 31, a conversion lens module 32, a housing 33, and a collimating lens 34, and the housing 33 can accommodate the structured light generating unit 31, the conversion lens module 32, and the collimating lens 34 therein. . The structured light generating unit 31 includes at least one light emitting source 311 and an optical element group 312, which is located on one side of the conversion lens module 32, which can generate a plurality of light beams 313. The optical element group 312 is located on the other side of the conversion lens module 32 and has a projection pattern 314 such that the plurality of light beams 313 penetrate the projection pattern 314 to output corresponding structured light 315. In the preferred embodiment, the light source 311 includes at least one of a laser diode (LED), a light emitting diode (LED), and an organic light emitting diode (OLED), and the light source is output. The light beam is at least one of a light beam having a first wavelength interval, a light beam having a second wavelength interval, and a light beam having a thermally induced wavelength interval.

The conversion lens module 32 is located between the illumination source 311 and the optical component group 312. The function of the conversion lens module 32 is to expand the complex beam 313. After the complex beam 313 passes through the conversion lens module 32, the collimator lens 34, and the optical component group 312, the projection lens module 32 can be projected. The projection surface 35 is outside the casing 33, and the structured light pattern 3151 is presented on the projection surface 35. The optical axis A1 of the conversion lens module 32 is a straight line. 5 shows that the number of conversion lenses in the conversion lens module 32 is three, that is, the conversion lens module 32 includes a first conversion lens 321, a second conversion lens 322, and a third conversion lens 323, a first conversion lens. The second conversion lens 322 and the third conversion lens 323 can expand the plurality of light beams 313 to make the distribution of the plurality of light beams 313 wider. The collimating lens 34 is disposed on the other side of the conversion lens module 32 and located at the third conversion lens 323 and Between the optical element groups 312, the function is to collimate the expanded plurality of beams 313 such that the complex beams 313 are as parallel as possible to the optical axis A1.

In the preferred embodiment, the three conversion lenses 321, 322, and 323 are negative, negative, and negative in order from the illuminating source 311 to the optical component 312 along the optical axis A1. , -, -) is indicated, and the refractive power of the collimator lens 34 is positive. The optical element group 312 includes at least one of a diffractive optical element (DOE), a refractive optical element, and a refractive array optical element corresponding to the structured light pattern 3151.

The optical device 3 of the present invention employs three conversion lenses 321, 322, 323 each having a negative refractive power, and the complex beam 313 can be expanded to produce a wider beam distribution. The collimating lens 34 having a positive refractive power is then utilized to collimate the expanded complex beam 313. When the complex beam 313 having a broad beam distribution is incident on the optical element group 312, the complex beam 313 penetrates the projection pattern 314 on the optical element group 312 to form the structured light 315, and the structured light 315 is projected onto the projection surface 35 to present a corresponding The wider structured light pattern 3151 of the projected pattern 314. Since the optical device 3 of the present invention can collimate and expand the complex beam 313 by three conversion lenses 321, 322, 323 each having a negative refractive power and a collimating lens 34 having a positive refractive power, the optical device of the present invention It is not necessary to accommodate a larger housing as in a conventional Kepler lens configuration, so that the optical device of the present invention can produce a suitable or larger structure while maintaining a thin and light outer casing. Light pattern. Wherein, the thickness of the casing 33 is less than 6 millimeters (mm), and preferably, the thickness of the casing 33 may be less than 4 millimeters.

Furthermore, the present invention further provides a second preferred embodiment different from the above. Please refer to FIG. 6, which is a side view showing the structure of the optical device of the present invention in a second preferred embodiment. The optical device 4 includes a structured light generating unit 41 and a conversion lens module 42. A housing 43 and a collimating lens 44, and the structured light generating unit 41 includes at least one illumination source 411 and an optical element group 412, and the optical element group 412 has a projection pattern 414. The structure of the optical device 4 of the preferred embodiment is substantially the same as that of the optical device 3 of the first preferred embodiment described above, and the same portions are not described again, and the difference lies in the structure of the conversion lens module 42.

The conversion lens module 42 is located between the illumination source 411 and the optical component group 412, and functions to expand the plurality of beams 413 output by the illumination source 411, and the complex beam 413 is projected to the conversion lens module 42 and the collimator lens 44 to be projected to The projection surface 45 outside the housing 43 and the structured light 415 present a structured light pattern 4151 on the projection surface 45. The optical axis A2 of the conversion lens module 42 is a straight line. 6 shows that the number of conversion lenses in the conversion lens module 42 is two, that is, the conversion lens module 42 includes a first conversion lens 421 and a second conversion lens 422, a first conversion lens 421 and a second conversion lens. The 422 can expand the complex beam 413 to provide a wider distribution of the plurality of beams 413. The collimating lens 44 can collimate the complex beam 413 such that the complex beam 413 is as parallel as possible to the optical axis A2. In the preferred embodiment, the two conversion lenses 421 and 422 are negatively and negatively defined by the refractive power of the light source 411 to the optical element group 412 along the optical axis A2, and are represented by (-, -). The refractive power of the straight lens 44 is positive.

Furthermore, the present invention further provides a third preferred embodiment different from the above. Please refer to FIG. 7, which is a side view showing the structure of the optical device of the present invention in a third preferred embodiment. The optical device 5 includes a structured light generating unit 51, a conversion lens module 52, a housing 53, a collimating lens 54, and a spatial filter 55, and the structured light generating unit 51 includes at least one light emitting source 511 and an optical element group 512, and optical The component group 512 has a projection pattern 514. The structure of the optical device 5 of the preferred embodiment is roughly The optical device 3 of the first preferred embodiment is the same as that of the optical device 3 of the first preferred embodiment, and the details are not described again. For the difference, the first, the structure of the conversion lens module 52, and the second preferred embodiment. The optical device 5 further includes a spatial filter 55.

First, the conversion lens module 52 is located between the illumination source 511 and the optical component group 512. The function of the conversion lens module 52 is to expand the plurality of light beams 513 output by the illumination source 511, so that the plurality of light beams 513 pass through the conversion lens module 52 and the collimator lens 54. The projection surface 56 is projected outside the housing 53 and the structured light 515 presents the structured light pattern 5151 on the projection surface 56. The optical axis A3 of the conversion lens module 52 is a straight line. 7 shows that the number of conversion lenses in the conversion lens module 52 is 1, so that the conversion lens 521 in the conversion lens module 52 can expand the complex beam 513 so that the distribution of the plurality of beams 513 is wider, and then the complex number is expanded. The beam 513 can collimate the plurality of beams 513 by passing through the collimating lens 54 such that the plurality of beams 513 are as parallel as possible to the optical axis A3. In the preferred embodiment, the refractive power of the conversion lens 521 is negative, indicated by (-), and the refractive power of the collimating lens 54 is positive.

Next, the spatial filter 55 is disposed between the collimating lens 54 and the optical element group 512, and functions to filter the noise in the complex beam 513. It is only an illustration, but not limited thereto. In another preferred embodiment, the spatial filter may also be disposed between the illumination source and the conversion lens module. It should be noted that the spatial filter 55 is arranged to filter noise, but it does not mean that the number of conversion lenses in the conversion lens module 52 is small, which increases the noise, and only the optical device 5 can be used when needed. The spatial filter 55 is disposed therein regardless of the number of conversion lenses in the conversion lens module 52.

Further, the present invention further provides a fourth preferred embodiment different from the above. Please refer to FIG. 8 , which is a structure of an optical device according to a fourth preferred embodiment of the present invention. Side view. The optical device 6 includes a structured light generating unit 61, a conversion lens module 62, a housing 63, a collimating lens 64, and a spatial filter 65, and the structured light generating unit 61 includes at least one light emitting source 611 and an optical element group 612, and optical Element set 612 has a projected pattern 614. The structure of the optical device 6 of the preferred embodiment is substantially the same as that of the optical device 3 of the first preferred embodiment described above, and the same portions are not described again, and the difference lies in the structure of the conversion lens module 62.

The conversion lens module 62 is located between the illumination source 611 and the optical component group 612. The function of the conversion lens module 62 is to expand the plurality of light beams 613 output by the illumination source 611, and the complex beam 613 is projected to the conversion lens module 62 and the collimator lens 64 to be projected to Projection surface 66 outside of housing 63, while structured light 615 presents structured light pattern 6151 on projection surface 66. The conversion lens module 62 includes a first conversion lens 621, a second conversion lens 622, and a third conversion lens 623. The first conversion lens 621 is close to the illumination source 611, which can expand the complex beam 613. The second conversion lens 622 is located between the first conversion lens 621 and the collimating lens 64, and can reflect the complex beam 613. The third conversion lens 623 is also located between the first conversion lens 621 and the collimating lens 64, and can be reflected. The plurality of beams 613 of the second conversion lens 622, and the plurality of beams 613 are incident on the collimator lens 64.

In the preferred embodiment, the conversion lens module 62 is a free-form lens group, and the optical axis A4 of the conversion lens module 62 is not a straight line, and is multiplied by the collimating lens 64. The angle between the beam 613 and the normal vector N of the optical element group 612 is less than 5 degrees. Preferably, the complex beam 613 is parallel to the normal vector of the optical element group 612 (the vector perpendicular to the optical element group 612).

In the conversion lens module 62, the numerical aperture (N.A.) of the first conversion lens 621 is less than 0.8, and the lens module 62 is converted. The design allows the plurality of beams 613 to exhibit different beam profiles, such as a rectangular distribution or a circular distribution.

In addition, the first conversion lens 621 and the collimating lens 64 have a high anti-reflection coating to reduce the amount of light reflected by the first conversion lens 621 and the collimating lens 64, and can improve the penetration of the first conversion lens. 621 and the amount of light of the collimator lens 64. On the other hand, the second conversion lens 622 and the third conversion lens 623 have a High Reflective Coating, and can have a reflection function, and can control the beam distribution and the projection direction of the complex beam 613. The second conversion lens 622 and the third conversion lens 623 may also be replaced by an object with a highly reflective coating.

The conversion lens module 62 in the form of a free-form lens group in the preferred embodiment can also expand and collimate the complex beam 614 to output a wider structured light 615, and can be presented on the projection surface 66 corresponding to the projection pattern. Structure light pattern 6151 of 614. At the same time, the thickness of the housing 63 can be less than 4 mm to have a slim profile. In addition, during the traveling of the complex beam 613 in the conversion lens module 62, noise may be generated. Therefore, a spatial filter 65 is disposed between the conversion lens module 62 and the optical element group 612 to filter noise.

It should be particularly noted that the conversion lens module of the free lens group configuration may also adopt the following design: the first numerical conversion aperture of the first conversion lens in the vertical direction is less than 0.6, and the first conversion lens is second in the horizontal direction. The numerical aperture is less than 0.5, that is, the first conversion lens can use a design that is asymmetric to the optical axis. Therefore, the curvature of the first conversion lens in the horizontal direction is different from the curvature in the vertical direction to control the beam distribution of the complex beam. And the direction of the projection. Or is the collimating lens a design that is asymmetric to the optical axis and the curvature and vertical direction of the collimating lens in the horizontal direction? The upper curvature is different to control the beam distribution and projection direction of the complex beam. Wherein, in response to the structure of the first conversion lens or the collimating lens that is asymmetric to the optical axis, the complex beam outputted to the conversion lens module is shifted to the optical axis, so that the optical component group can cooperate with the offset complex beam The offset mode is set, and the structured light without offset can be output.

In addition, the optical device of the present invention can adopt different types of conversion lens modules according to different applications, and FIG. 9 shows the conversion lens module 72 and the collimating lens 73 in the form of a free lens group of different embodiments, with optical The component groups 712 are matched to each other to produce the desired structured light.

It should be particularly noted that the light source used in the optical device of the present invention is not limited to a small-sized light source, a light source that conforms to a paraxial optical definition, a light source with a small light-emitting angle, and Lambertian. A light source, a Gaussian light source or a uniform light source, etc., in other words, the optical device of the present invention may also use a light source of a different form than the plurality of light sources described above. For example: large illuminating sources, illuminating sources that are not defined by paraxial optics, illuminating sources with large illuminating angles, non-Lambert sources, non-Gaussian sources or non-uniform sources of Bat-wing sources or Arc-like Light source, etc.

According to the above, the optical device of the present invention can effectively expand and collimate a plurality of beams in a finite thickness casing by a conversion lens module having a negative refractive power and a collimating lens having a positive refractive power to output a wider structured light. And can present a wider structured light pattern. Alternatively, a conversion lens module in the form of a free lens group can be used, which can also achieve the implementation of a thin and light-shaped housing and produce the effect of a suitably sized structured light pattern. Wherein, the light beam generated by the light source can be expanded, and the projected pattern area of the optical component group matching the same does not need to be reduced, so that high assembly can be solved. Tolerance requirements are problematic and easy to assemble.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, any equivalent changes or modifications made without departing from the spirit of the present invention should be included in the present invention. Within the scope of the patent application.

3‧‧‧Optical device

31‧‧‧Structural light generating unit

32‧‧‧Conversion lens module

33‧‧‧Shell

34‧‧‧ Collimating lens

35‧‧‧projection surface

311‧‧‧Light source

312‧‧‧Optical component group

313‧‧‧ Beam

314‧‧‧projection pattern

315‧‧‧ structured light

321‧‧‧First conversion lens

322‧‧‧Second conversion lens

323‧‧‧ Third conversion lens

3151‧‧‧Structural light pattern

A1‧‧‧ optical axis

Claims (17)

An optical device comprising: a structured light generating unit for outputting a structure light, the structured light generating unit comprising: at least one light source for generating a plurality of light beams; and an optical component group having a projection a pattern, and the projection pattern is penetrated by the plurality of beams to output the structured light; a conversion lens module is disposed between the at least one illumination source and the optical element for expanding the plurality of beams to pass the plurality of beams Converting the lens module to a projection surface, and presenting a structured light pattern on the projection surface; wherein all of the conversion lenses in the conversion lens module have a negative optical power (Negative Optical Power), the conversion lens module The first conversion lens is disposed adjacent to the at least one illumination source for expanding the plurality of light beams; a second conversion lens is disposed between the first conversion lens and the optical element group for reflecting the plurality of light beams; And a third conversion lens between the first conversion lens and the optical element group for reflecting the reflection by the second conversion lens a plurality of light beams; a collimating lens disposed on one side of the conversion lens module for collimating the expanded plurality of beams; and a casing for accommodating the structured light generating unit and the conversion lens module And the collimating lens; wherein the plurality of beams pass through the third conversion lens and are projected to the collimating lens. The optical device of claim 1, wherein the number of the conversion lenses in the conversion lens module is 1, and one of the conversion lens modules has a linear axis, and the conversion lens is along the optical axis The optical power is negative, and the refractive power of the collimating lens is positive. The optical device of claim 1, wherein the number of the conversion lenses in the conversion lens module is two, and one of the optical axes of the conversion lens module is a straight line, and the two conversion lenses are at least The refractive power of the light source to the optical element group along the optical axis is negative and negative, and the refractive power of the collimating lens is positive. The optical device of claim 1, wherein the number of the conversion lenses in the conversion lens module is three, and one of the optical axes of the conversion lens module is a straight line, and the three conversion lens is at least The refractive power of a light source to the optical element group along the optical axis is negative, negative, and negative, and the refractive power of the collimating lens is positive. The optical device of claim 1, wherein the conversion lens module is a free lens group, and the optical axis of the conversion lens module is not a straight line, and the plurality of optical elements are incident on the optical element group. The angle between the beam and one of the optical vectors of the set of optical elements is less than 5 degrees. The optical device of claim 1, wherein one of the first conversion lenses has a numerical aperture (N.A.) of less than 0.8, and the plurality of beams exhibit a rectangular distribution or an annular distribution. The optical device of claim 1, wherein the first conversion lens has a first numerical aperture of less than 0.6 in a vertical direction and a second numerical aperture of the first conversion lens in a horizontal direction. Less than 0.5, and the complex beam exhibits a rectangular distribution or an annular distribution. The optical device of claim 1, wherein the first conversion lens The axis of the conversion lens module is asymmetric, and the curvature of the first conversion lens in a horizontal direction is different from the curvature of a vertical direction to control the distribution of the complex beam and the projection direction. The optical device of claim 1, wherein at least one of the first conversion lens and the collimating lens has a high anti-reflection coating, the second conversion lens, and the third At least one of the conversion lenses has a High Reflective Coating to control the distribution of the plurality of beams and the direction of projection. The optical device of claim 1, wherein the collimating lens is asymmetric to an optical axis of the conversion lens module, and the collimating lens has a curvature in a horizontal direction and a vertical direction. The curvature is different to control the distribution of the complex beam and the direction of projection. The optical device of claim 1, further comprising a spatial filter disposed between the collimating lens and the optical component group, or between the at least one illumination source and the conversion lens module For filtering noise in the complex beam. The optical device of claim 1, wherein the optical component group comprises a diffractive optical element (DOE), a refractive optical element, and a refractive array optical corresponding to the structured light pattern. At least one of the components. The optical device of claim 1, wherein the thickness of the housing is less than 6 millimeters (mm). An optical device comprising: a structured light generating unit for outputting a structured light, the structured light generating unit package Included: at least one illumination source for generating a plurality of light beams; and an optical component group having a projection pattern, and the projection pattern is penetrated by the plurality of beams to output the structured light; and a conversion lens module is located at the at least one Between the light source and the optical component, the plurality of light beams are extended, and the plurality of light beams are passed through the conversion lens module and projected onto a projection surface, and a structured light pattern is presented on the projection surface, and the conversion lens module is disposed on the projection surface. The first conversion lens is disposed adjacent to the at least one illumination source for expanding the plurality of light beams; a second conversion lens is disposed between the first conversion lens and the optical element group for reflecting the plurality of light beams; And a third conversion lens between the first conversion lens and the optical component group for reflecting the complex beam reflected by the second conversion lens; a collimating lens disposed in the conversion lens module a side for collimating the plurality of beams that are expanded; wherein the plurality of beams are projected through the third conversion lens to the collimating lens; and a housing for receiving Pattern generation means, the conversion lens and a collimator lens module; wherein the housing is less than a thickness of 4 mm. The optical device of claim 14, wherein the number of the conversion lenses in the conversion lens module is 1, and an optical axis of the conversion lens module is a straight line along which the conversion lens is The refractive power is negative, and the refractive power of the collimating lens is positive. The optical device of claim 14, wherein the conversion lens module The number of the conversion lenses in the group is 2, and one of the optical axes of the conversion lens module is a straight line, and the refractive power of the two conversion lenses from the at least one illumination source to the optical element group along the optical axis is Negative and negative, and the refractive power of the collimating lens is positive. The optical device of claim 14, wherein the number of the conversion lenses in the conversion lens module is three, and one of the optical axes of the conversion lens module is a straight line, and the three conversion lens is at least The refractive power of a light source to the optical element group along the optical axis is negative, negative, and negative, and the refractive power of the collimating lens is positive.