Collimating compound eye mixed light lens and projection light machine

Abstract

The application provides a collimating compound eye mixed light lens and a projection light machine. The collimating compound eye mixed light lens comprises a lens body, the incident side of the lens body is provided with an incident groove, the groove bottom surface of the incident groove is a first refractive surface, the side wall surface of the incident groove is a second refractive surface, the lens body further comprises a reflecting surface and an exit surface, the first refractive surface is oppositely arranged with the exit surface, the two sides of the reflecting surface are respectively connected with the second refractive surface and the exit surface, the first refractive surface, the reflecting surface and the exit surface are all provided with a microlens array, the microlens array is composed of a plurality of microlenses, the plurality of microlenses on different surfaces are different, the microlens array on the exit surface is divided into a first array area and a second array area, the microlens array of the first refractive surface corresponds to the first array area, and the microlens array of the reflecting surface corresponds to the second array area. The application solves the problem of single function of the lens in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical display devices, in particular to a collimating compound eye light mixing lens and a projection light machine. BACKGROUND

[0002] In an AR display device, a projection light machine is a key component. There are various types of projection light machines, such as LCOS, DLP and MicroLED. Due to certain limitations in the technologies of DLP and MicroLED, LCOS projection light machines have gradually become the mainstream solution.

[0003] An LCOS projection light machine is usually divided into an illumination module and an imaging module according to functions. The imaging module projects an image source. The illumination module projects a field uniformity of a light source to an LCOS reflecting surface, and needs to ensure that the illuminance and color distribution of the LCOS reflecting surface are uniform, i.e. light mixing. At present, light mixing is mainly realized based on a Kohler illumination system transformation, such as the composition of a light guide column, a compound eye lens and a field lens, or the composition of a TIR lens, a compound eye lens and a field lens, or the composition of a collimating lens group, a compound eye lens and a field lens, etc., mainly in the selection of different collimating schemes. That is, the current single lens can only realize one function. If the light beam needs to be collimated and mixed in the optical system, two lenses are usually arranged to realize collimation and light mixing respectively, which increases the volume of the projection light machine, and it is difficult to apply in small devices, and it is also difficult to ensure light weight,

[0004] That is, the lens in the prior art has the problem of single function. SUMMARY

[0005] The main purpose of the present application is to provide a collimating compound eye light mixing lens and a projection light machine to solve the problem of single function of the lens in the prior art.

[0006] In order to achieve the above purpose, according to one aspect of the present application, a collimating compound eye light mixing lens is provided, which comprises a lens body, the incident side of the lens body has a light inlet groove, the groove bottom surface of the light inlet groove is a first refractive surface, the side wall surface of the light inlet groove is a second refractive surface, the lens body further comprises a reflecting surface and an exit surface, the first refractive surface is arranged opposite to the exit surface, the two sides of the reflecting surface are connected with the second refractive surface and the exit surface respectively, the first refractive surface, the reflecting surface and the exit surface are all provided with a microlens array, the microlens array is composed of a plurality of microlenses, the plurality of microlenses on different surfaces are different, the microlens array on the exit surface is divided into a first array area and a second array area, the microlens array of the first refractive surface corresponds to the first array area, and the microlens array of the reflecting surface corresponds to the second array area.

[0007] Further, the number of microlenses of the first refractive surface and the number of microlenses of the reflective surface are equal to the number of microlenses of the exit surface, and the plurality of microlenses of the first refractive surface are arranged one-to-one corresponding to the plurality of microlenses of the first array region, and the plurality of microlenses of the reflective surface are arranged one-to-one corresponding to the plurality of microlenses of the second array region.

[0008] Further, the reflective surface is arranged in an open manner, and the reflective surface arranged in an open manner gradually increases along the cross-sectional area parallel to the exit surface from the light entrance side to the light exit side, and the surface of the microlens array on the reflective surface is wavy along the circumferential direction of the lens body and the direction from the light entrance side to the light exit side.

[0009] Further, the microlens array on the reflective surface is divided into a plurality of groups of microlenses along the circumferential direction of the lens body, each group including a plurality of microlenses, and a group of microlenses is sequentially arranged in a direction away from the exit surface.

[0010] Further, the divergence angle of the light beam emitted through the microlenses of the exit surface is greater than or equal to 15° and less than or equal to 25°.

[0011] Further, the convergence points of the plurality of microlenses of the reflective surface are all on the second array region, and the divergence angle of the light beam emitted through the microlenses of the reflective surface is greater than 1° and less than 25°.

[0012] Further, the focal lengths of the microlenses at different positions of the reflective surface in the Z-axis direction are different.

[0013] Further, the lens body further includes an end face, the second refractive surface is connected to the reflective surface through the end face, the end face is in the form of a circular ring, the inner ring side of the circular ring-shaped end face is connected to the second refractive surface, and the outer ring side of the circular ring-shaped end face is connected to the reflective surface.

[0014] Further, the height h of the lens body is greater than 0.5 mm and less than 50 mm.

[0015] Further, the first array region is located at the center position of the exit surface, the second array region is continuously arranged around the circumferential direction of the first array region, the plane where the first array region is located and the plane where the second array region is located are in the same horizontal plane, or there is a height difference between the plane where the first array region is located and the plane where the second array region is located, and the first array region is arranged close to the first refractive surface relative to the second array region.

[0016] Further, the distance between two adjacent microlenses of the plurality of microlenses arranged in the radial direction of the second array region gradually decreases in a direction away from the first array region, and / or the exit center position of each microlens of the first array region is offset from the base center position of the microlens.

[0017] Further, the distance h1 between the first refractive surface and the slot opening of the light entrance slot satisfies:

[0018]

[0019] wherein r1 is the radius of the slot of the light inlet groove, a is the half-emission angle of the first refractive surface for controlling the light beam, and y is the draft angle of the second refractive surface.

[0020] Further, the distance h1 between the first refractive surface and the slot of the light inlet groove satisfies: 0.2mm < h1 < 20mm; and / or the radius r1 of the slot of the light inlet groove satisfies: 0.2mm < r1 < 2mm.

[0021] Further, the half-emission angle a of the first refractive surface for controlling the light beam satisfies: a < 20°; and / or the draft angle y of the second refractive surface satisfies: 0° < y < 20°.

[0022] Further, the first refractive surface is circular, and the radius r2 of the circular first refractive surface satisfies:

[0023] r2 = r1 - h1 tan y = h1 tan a Formula (2)

[0024] wherein r1 is the radius of the slot of the light inlet groove, h1 is the distance between the first refractive surface and the slot of the light inlet groove, y is the draft angle of the second refractive surface, and a is the half-emission angle of the first refractive surface for controlling the light beam.

[0025] Further, the focal length f1 of the microlens of the first refractive surface satisfies:

[0026]

[0027] wherein h1 is the distance between the first refractive surface and the slot of the light inlet groove, and h2 is the distance between the first refractive surface and the first array region.

[0028] According to another aspect of the present application, there is provided a projection optical machine comprising the above-mentioned collimating compound-eye light mixing lens.

[0029] The collimating compound-eye light mixing lens comprises a lens body, the incident side of the lens body has a light inlet groove, the groove bottom surface of the light inlet groove is a first refractive surface, the side wall surface of the light inlet groove is a second refractive surface, the lens body further comprises a reflecting surface and an exit surface, the first refractive surface is oppositely arranged with the exit surface, the two sides of the reflecting surface are respectively connected with the second refractive surface and the exit surface, microlens arrays are arranged on the first refractive surface, the reflecting surface and the exit surface, the microlens arrays are composed of a plurality of microlenses, the plurality of microlenses on different surfaces are different, the microlens array on the exit surface is divided into a first array region and a second array region, the microlens array of the first refractive surface corresponds to the first array region, and the microlens array of the reflecting surface corresponds to the second array region.

[0030] By setting an entrance slot, the entrance slot can provide a first refractive surface and a second refractive surface for the incident light beam to be refracted into the lens body. The incident light beam can enter the lens body through the refraction of the first refractive surface and the second refractive surface. By arranging microlens arrays on the first refractive surface, the reflecting surface and the exiting surface, and dividing the microlens array on the exiting surface into a first array area and a second array area, the microlens array on the first refractive surface corresponds to the first array area, and the microlens array on the reflecting surface corresponds to the second array area. In this way, the microlens array on the first refractive surface can focus the incident light beam into the first array area, and the light beam entering through the second refractive surface is incident on the microlens array on the reflecting surface. Then, the microlens array on the reflecting surface focuses the light beam into the second array area, and the light beams exiting from the first array area and the second array area achieve light mixing in the far field. In addition, this application utilizes the microlens array of the first refractive surface and the microlens array of the reflective surface to achieve the collimation effect, and utilizes the microlens array of the exit surface to achieve the light mixing effect. This enables the collimating compound eye light mixing lens of this application to integrate the functions of light mixing and collimation, avoiding the use of two lenses, saving optical lenses, and reducing the size of the projection optical engine. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 A schematic diagram of the collimating compound eye mixing lens according to an optional embodiment of the present invention is shown;

[0033] Figure 2 It shows Figure 1 The optical path effect diagram of the reflecting surface of the collimating compound eye mixing lens;

[0034] Figure 3 It shows Figure 2 The coordinate diagram of the emitted beam from the microlens of the reflecting surface in the image;

[0035] Figure 4 It shows Figure 1 The optical path effect diagram of the first refractive surface and the first array region of the collimating compound eye mixing lens;

[0036] Figure 5 It shows Figure 4 The optical path diagram of the corresponding set of lenses in the diagram;

[0037] Figure 6 It shows Figure 1 A partial dimension annotation diagram of the collimating compound eye mixing lens;

[0038] Figure 7 It shows Figure 1A size annotation diagram of the collimating compound eye mixed light lens in the figure;

[0039] Figure 8 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown Figure 1 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown

[0040] Figure 9 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown Figure 8 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown

[0041] Figure 10 A structure schematic diagram of the collimating compound eye mixed light lens of the embodiment one of the present application is shown

[0042] Figure 11 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown Figure 10 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown

[0043] Figure 12 A structure schematic diagram of the collimating compound eye mixed light lens of the embodiment two of the present application is shown

[0044] Figure 13 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown Figure 12 A light path effect diagram of the collimating compound eye mixed light lens in the figure is shown

[0045] Figure 14 A light path effect diagram of the collimating compound eye mixed light lens of the embodiment three of the present application is shown

[0046] Figure 15 A light path effect diagram of another collimating compound eye mixed light lens of the embodiment three of the present application is shown.

[0047] Wherein, the above-mentioned drawings include the following reference signs:

[0048] 10, light inlet groove; 11, first refractive surface; 12, second refractive surface; 20, end surface; 30, reflecting surface; 40, exit surface; 41, first array region; 42, second array region; 50, connecting surface. DETAILED DESCRIPTION

[0049] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0050] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled in the art to which the present application belongs.

[0051] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0052] To address the problem of limited functionality in existing lenses, this invention provides a collimating compound eye mixing lens and a projection optical engine.

[0053] like Figures 1 to 15 As shown, the collimating compound eye mixing lens includes a lens body. The incident side of the lens body has an incident groove 10. The bottom surface of the incident groove 10 is a first refractive surface 11, and the side wall surface of the incident groove 10 is a second refractive surface 12. The lens body also includes a reflecting surface 30 and an exiting surface 40. The first refractive surface 11 and the exiting surface 40 are arranged opposite to each other. The two sides of the reflecting surface 30 are connected to the second refractive surface 12 and the exiting surface 40, respectively. Microlens arrays are provided on the first refractive surface 11, the reflecting surface 30, and the exiting surface 40. The microlens array is composed of multiple microlenses. The multiple microlenses on different surfaces are different. The microlens array on the exiting surface 40 is divided into a first array region 41 and a second array region 42. The microlens array of the first refractive surface 11 corresponds to the first array region 41, and the microlens array of the reflecting surface 30 corresponds to the second array region 42.

[0054] By setting the entrance slot 10, the entrance slot 10 can provide a first refractive surface 11 and a second refractive surface 12 for the incident light beam to be refracted into the lens body. The incident light beam can enter the lens body through the refraction of the first refractive surface 11 and the second refractive surface 12. By arranging microlens arrays on the first refractive surface 11, the reflecting surface 30 and the exiting surface 40, and dividing the microlens array on the exiting surface 40 into a first array region 41 and a second array region 42, the microlens array of the first refractive surface 11 corresponds to the first array region 41, and the microlens array of the reflecting surface 30 corresponds to the second array region 42. In this way, the microlens array of the first refractive surface 11 can focus the incident light beam into the first array region 41, and the light beam entering through the second refractive surface 12 is incident on the microlens array of the reflecting surface 30. Then, the microlens array of the reflecting surface 30 focuses the light beam into the second array region 42, and the light beams emitted from the first array region 41 and the second array region 42 achieve light mixing in the far field. In addition, this application utilizes the microlens array of the first refractive surface 11 and the microlens array of the reflective surface 30 to achieve the collimation effect, and utilizes the microlens array of the exit surface 40 to achieve the light mixing effect. This enables the collimating compound eye light mixing lens of this application to integrate the functions of light mixing and collimation, avoids the use of two lenses, saves optical lenses, and reduces the size of the projection optical engine.

[0055] It should be noted that the first refractive surface 11 is a plane, that is, the setting base of the microlens array on the first refractive surface 11 is a plane.

[0056] Specifically, the sum of the number of microlenses of the first refractive surface 11 and the number of microlenses of the reflecting surface 30 is equal to the number of microlenses of the exit surface 40, and the plurality of microlenses of the first refractive surface 11 are arranged one-to-one corresponding to the plurality of microlenses of the first array area 41, and the plurality of microlenses of the reflecting surface 30 are arranged one-to-one corresponding to the plurality of microlenses of the second array area 42. Such arrangement enables one microlens on the first refractive surface 11 and one microlens in the corresponding first array area 41 to achieve the shaping of the same light beam, and one microlens on the reflecting surface 30 and one microlens in the corresponding second array area 42 to achieve the shaping of the same light beam. Such arrangement is conducive to the reasonable distribution of light beams, the increase of the utilization rate of light rays incident to the lens body, the avoidance of light loss, the increase of the final light mixing effect and light intensity.

[0057] In the process of light beam transmission, the plurality of microlenses on the first refractive surface 11 converge the incident light beams into a plurality of convergence points, which fall one-to-one on the plurality of microlenses of the first array area 41. The chief ray angles of the light beams incident to each microlens of the first refractive surface 11 are different, and the first refractive surface 11 is arranged to control the half-emission angle α of the light beam to satisfy: α < 20°, which is also the half-divergence angle of the light beam incident to the first refractive surface 11. The plurality of microlenses on the exit surface 40 form a plurality of sub-eyes, each of which is emitted with a divergence angle of 20±5° to form a plurality of sub-light sources, which are emitted with an angle of 20±5°. That is, the divergence angle of the light beam emitted through the microlenses of the exit surface 40 is greater than or equal to 15° and less than or equal to 25°. The control of the half-emission angle α of the light beam by the first refractive surface 11 and the divergence angle of the light beam emitted through the microlenses of the exit surface 40 causes the multiple light beams emitted to overlap in the far field, and the corresponding light spots of each light beam are superimposed on each other after overlapping and matching, achieving the purpose of light mixing. The color and illuminance of the light spot after superimposed light mixing are uniform.

[0058] Reference Figure 7 The height h of the lens body is greater than 0.5 mm and less than 50 mm. By restricting the height of the lens body to be less than 50 mm, the volume of the lens body can be reduced while saving components, which is conducive to ensuring the miniaturization of the collimating compound eye light mixing lens and further ensuring the small size of the projection light machine to which it is applied.

[0059] Specifically, the sum of the number of microlenses on the first refractive surface 11 and the number of microlenses on the reflective surface 30 is equal to the number of microlenses on the exit surface 40. Furthermore, the multiple microlenses on the first refractive surface 11 correspond one-to-one with the multiple microlenses in the first array region 41, and the multiple microlenses on the reflective surface 30 correspond one-to-one with the multiple microlenses in the second array region 42. In other words, the projections of the multiple microlenses on the exit surface 40 of the first refractive surface 11 correspond one-to-one with the multiple microlenses in the first array region 41, and the projections of the multiple microlenses on the exit surface 40 of the reflective surface 30 correspond one-to-one with the multiple microlenses in the second array region 42. This arrangement ensures that the sub-beams formed by the microlenses on the first refractive surface 11 and the reflective surface 30 are each controlled separately by their corresponding microlenses on the exit surface 40. Because different sub-beams have different divergence angles, after being modulated separately by the corresponding microlenses on the exit surface 40, the difference in the divergence angle of the final exit beam can be reduced, thereby achieving a better light mixing effect in the far field.

[0060] Specifically, the microlenses on the first refractive surface 11 are arranged in a rectangular array, a circular array, a Fibonacci array, or a random array. The microlenses on the reflecting surface 30 are also arranged in a rectangular array, a circular array, a Fibonacci array, or a random array. The microlenses on the exiting surface 40 are also arranged in a rectangular array, a circular array, a Fibonacci array, or a random array. These arrangements can be made according to actual needs, but it is essential to ensure that each microlens on each surface is in a block-like configuration. A uniform or periodic array can achieve the light mixing effect, while a random array can further enhance the light mixing effect.

[0061] refer to Figure 2 and Figure 3 The convergence points of the multiple microlenses of the reflecting surface 30 are all on the second array region 42. The divergence angle θ of the outgoing beam through one microlens of the reflecting surface 30 is greater than 1° and less than 25°. The divergence angle of the outgoing beam formed by each microlens is the same.

[0062] refer to Figure 1 and Figure 2 The cross-section of the lens body on the Z-axis is trapezoidal, and the reflecting surface 30 is set in an open shape, that is, the reflecting surface 30 is set in a shape similar to a horn. The structure formed by the open reflecting surface 30 gradually increases in cross-sectional area parallel to the exiting surface 40 from the light-incident side to the light-outcident side. The surface of the microlens array on the reflecting surface 30 is wavy along the circumference of the lens body, and the surface of the microlens array on the reflecting surface 30 is wavy from the light-incident side to the light-outcident side.

[0063] Specifically, the microlens array on the reflecting surface 30 is divided into multiple groups of microlenses along the circumference of the lens body, each group including multiple microlenses. A group of microlenses is arranged sequentially in a direction away from the exit surface 40. The surface formed by a group of microlenses is wavy in a direction away from the exit surface 40.

[0064] refer to Figure 1 and Figure 2 The microlens array on the exit surface 40 is positioned in the XY plane (Y-axis not shown), and the first refractive surface 11 is parallel to the exit surface 40. The focal lengths of the microlenses at different positions on the reflecting surface 30 along the Z-axis are different. Because each microlens on the reflecting surface 30 has a different coordinate along the Z-axis, the focal lengths of microlenses at different Z-axis coordinates are different. This ensures that the sub-beams reflected by the microlenses on the reflecting surface 30 converge on the exit surface 40, so that the sub-beams do not exceed the aperture of the corresponding microlens when they reach the microlenses on the exit surface 40.

[0065] refer to Figure 1 , Figure 4 , Figure 6 , Figure 8 As shown, the lens body also includes an end face 20. The second refractive surface 12 is connected to the reflective surface 30 through the end face 20. The end face 20 is annular. The inner ring side of the annular end face 20 is connected to the side of the second refractive surface 12 away from the first refractive surface 11, and the outer ring side of the annular end face 20 is connected to the side of the reflective surface 30 away from the exit surface 40. The end face 20 is parallel to the first refractive surface 11. The end face 20 is not used for the ingress of the incident light. That is to say, only the first refractive surface 11 and the second refractive surface 12 are used to ingress the incident light into the lens body.

[0066] In a specific embodiment of this application, the first refractive surface 11 is circular, the exit surface 40 is circular, the projection of the first array region 41 onto the exit surface 40 is circular, and the projection of the second array region 42 onto the exit surface 40 is annular. The first array region 41 is located at the center of the exit surface 40, and the second array region 42 is continuously arranged around the circumference of the first array region 41.

[0067] The design of the microlens arrays of the first refractive surface 11, the reflective surface 30, and the exit surface 40 will be described in detail below.

[0068] First, such as Figure 2 and Figure 3 As shown, for the microlens array on the reflecting surface 30, the height difference dh between the surface of each microlens and the exiting surface 40 is... i Defined as the difference between the average height of the converging point and the two endpoints of the microlens surface and the height of the microlens at the exit surface 40, because dh i The height difference dh is not equal; to ensure that the divergence angles of the reflected sub-beams are consistent, the height difference dh is... i The smaller the microlens surface, the shorter its projected length along the X-axis. The specific relationship is as follows:

[0069]

[0070] Among them, the two end points of the surface of the microlens are the lower end point D(x id , z id ), and the upper end point U(x iu , z iu ). The reflection convergence point T(Tx i , h) of the microlens surface, where h is the height of the lens body, and the preferred range of h is 0.5mm < h < 50mm. The subscript i is the serial number of the microlens surface. Each point on the microlens surface is obtained sequentially according to Snell's law combined with the iterative calculation method.

[0071] Secondly, as Figures 4 to 7 shown, for the microlens array on the first refraction surface 11, the first refraction surface 11 is a plane. The microlenses on the first refraction surface 11 are used to converge the light beam irradiated onto it to the exit surface 40. Multiple microlenses converge into multiple convergence points, forming multiple sub-beams. Due to the different angles of the principal rays incident on each microlens, there are differences in the angles of each sub-beam. To ensure the light mixing effect, the difference in the angles of the principal rays of each microlens needs to be restricted, and the difference in the angles of the principal rays of each microlens is controlled within a range less than 20°, preferably restricted within 15°.

[0072] As Figure 6 and Figure 7 shown, the distance h1 between the first refraction surface 11 and the notch of the light inlet groove 10 satisfies:

[0073]

[0074] Among them, r1 is the radius of the notch of the light inlet groove 10, and the radius of the notch of the light inlet groove 10 is preferably larger than the size of the light emitting surface of the light source; α is the half emission angle of the first refraction surface 11 for controlling the light beam. To ensure a better light mixing effect, the half emission angle α of the first refraction surface 11 for controlling the light beam satisfies: α < 20°, preferably α < 15°, that is, the difference in the angles of the principal rays of each microlens is preferably controlled within 15°; γ is the draft angle of the second refraction surface 12, and the draft angle γ of the second refraction surface 12 satisfies: 0° < γ < 20°. Such a setting is beneficial to the forming of the light inlet groove 10 and further ensures the forming stability of the first refraction surface 11 and the second refraction surface 12. Preferably, 0° < γ < 5°. Through this formula (1), the aperture of the first refraction surface 11 is determined: when γ is determined, the value of h1 can be determined through the range of α, which is convenient for determining the geometric dimension range of the lens body.

[0075] As Figure 7 shown, the first refraction surface 11 is circular, and the radius r2 of the circular first refraction surface 11 satisfies:

[0076] r2 = r1 - h1·tanγ = h1·tanα Formula (2)

[0077] Where, r1 is the radius of the notch of the light incident groove 10, h1 is the distance between the first refraction surface 11 and the notch of the light incident groove 10, γ is the draft angle of the second refraction surface 12, and α is the half emission angle of the first refraction surface 11 for controlling the light beam.

[0078] Specifically, the microlens array of the first refraction surface 11 can be arranged in a rectangular array, or a circular array, or a Fibonacci array, or a random array.

[0079] Specifically, the distance h1 between the first refraction surface 11 and the notch of the light incident groove 10 satisfies: 0.2mm < h1 < 20mm; the radius r1 of the notch of the light incident groove 10 satisfies: 0.2mm < r1 < 2mm.

[0080] As Figures 5 to 7 shown, when the microlens of the first refraction surface 11 converges the sub - light beam on the exit surface 40, the focal length f1 of the microlens of the first refraction surface 11 satisfies:

[0081]

[0082] Where, h1 is the distance between the first refraction surface 11 and the notch of the light incident groove 10, h2 is the distance between the first refraction surface 11 and the first array region 41. h2 satisfies: 0.2 < h2 < 30mm. Such a setting can be based on different design scenarios. The optimal solution is that the microlens of the first refraction surface 11 and the microlens of the reflection surface 30 converge their respective sub - light beams to the exit surface 40. However, when the structure or other conditions limit the complete convergence of the sub - light beam to the exit surface 40, the exit sub - light beam with the same divergence angle can be obtained by adjusting the focal length of the microlens, giving freedom to the design.

[0083] If the microlens of the first refraction surface 11 does not converge the sub - light beam on the exit surface 40, the divergence angle of the exit sub - light beam can be controlled by matching the focal length f2 of the microlens of the first array region 41 with the focal length f1 of the microlens of the first refraction surface 11, that is, satisfying:

[0084]

[0085] Where, referring to Figure 5 , b is the divergence angle of the sub - light beam emitted by the microlens of the exit surface 40, is the divergence angle of the light beam incident on the microlens of the first refraction surface 11.

[0086] Finally, as Figure 8 and Figure 9As shown, for the microlens array of the exit surface 40, the microlens array of the exit surface 40 is divided into a first array region 41 and a second array region 42. The first array region 41 is circular and located at the center. The second array region 42 is continuously arranged around the circumference of the first array region 41, and both the first array region 41 and the second array region 42 are integral units. The first array region 41 includes multiple microlenses, and the second array region 42 includes multiple microlenses. The microlenses in the first array region 41 are different from those in the second array region 42. The multiple microlenses in the second array region 42 are arranged in a random array, and the center position of the microlenses is determined by the convergence point T(Txi,h) of the microlenses of the first reflecting surface 30. (Refer to...) Figure 3 The multiple microlenses in the second array region 42 are arranged from sparse to dense in a radially outward direction. That is, the distance between two adjacent microlenses in the multiple microlenses arranged radially in the second array region 42 gradually decreases in a direction away from the first array region 41.

[0087] like Figure 8 and Figure 9 As shown, the multiple microlenses in the first array region 41 are arranged in a random array, and the center position of the microlens base is determined by the position of the microlens, specifically as follows:

[0088] xpi=xi+h2·tanβi; Formula (5)

[0089] tanβi=xi / h; Formula (6)

[0090] Wherein, the coordinates of the center point of the microlens in the first refractive surface 11 are Ci(xi,h1), βi is the principal ray angle, and Pi is the base center position of the microlens in the first array region 41; to compensate for the beam deviation of each microlens sub-beam in the first refractive surface 11, the microlenses in the first array region 41 can be offset from their base center positions toward the center of the exit surface 40, with reference to... Figure 8 The exit center positions of each microlens in the first array region 41 are offset from their base center positions towards the center position of the exit surface 40. This arrangement reduces the difference in the exit direction of the center rays of each exiting sub-beam, ensuring that the exiting sub-beams exit in the same direction and improving the light mixing effect. The focal length f1 of the microlens in the first refractive surface 11 is equal to the focal length f2 of the corresponding microlens in the first array region 41. Figure 9 The left and right sides respectively show the optical path comparison diagrams of each microlens in the first array region 41 before and after the position of the emission center is shifted.

[0091] Specifically, the lens body is made of plastic or glass, using lens material with high light transmittance and mature molding technology.

[0092] The collimating compound eye mixing lens of this application will be described below with reference to specific embodiments.

[0093] Example 1

[0094] like Figure 10 and Figure 11 As shown, the collimating compound eye mixing lens of Embodiment 1 is described.

[0095] In Example 1, reference Figure 10 The surface where the first array region 41 is located is on the same horizontal plane as the surface where the second array region 42 is located, that is, the exit surface 40 is a complete surface.

[0096] In Embodiment 1, each microlens of the first refractive surface 11 and each microlens of the reflective surface 30 converge multiple sub-beams to the exiting surface 40. Each sub-beam is refracted by the corresponding microlens on the exiting surface 40 and then exits. The emission angle of each exiting sub-beam is 20±5°.

[0097] In Embodiment 1, the height of the lens body is h = 6.2 mm. The distance between the first refractive surface 11 and the opening of the entrance slot 10 is h1 = 3 mm, the distance between the first refractive surface 11 and the first array region 41 is h2 = 3.2 mm, the radius of the entrance slot 10 is r1 = 1.2 mm, the radius of the first refractive surface 11 is r2 = 1.04 mm, the draft angle γ of the second refractive surface 12 is 3°, the first refractive surface 11 controls the half-emission angle α of the light beam to be 19.1°, the focal length f2 of the microlens of the first array region 41 and the focal length f1 of the microlens of the first refractive surface 11 satisfy: f1 = f2 = 1.548 mm, and the divergence angle θ of the multiple sub-beams formed by the convergence of the light rays after passing through the microlens of the reflecting surface 30 at the exit surface 40 is 13°.

[0098] Example 2

[0099] like Figure 12 and Figure 13 As shown, the collimating compound eye mixing lens of Embodiment 2 is described.

[0100] The difference between Embodiment 2 and Embodiment 1 is that there is a height difference between the surface where the first array region 41 is located and the surface where the second array region 42 is located, and the first array region 41 is positioned closer to the first refractive surface 11 relative to the second array region 42. In other words, the side of the lens body with the exit surface 40 corresponding to the position of the first array region 41 is concave. This arrangement reduces the adhesive thickness of the lens body, facilitating molding. The first array region 41 and the second array region 42 are connected by a connecting surface 50. The sub-beams of the microlens of the first refractive surface 11 and the microlens of the reflecting surface 30 converge at exit surfaces 40 at different heights, with the convergence point of the sub-beams of the microlens of the first refractive surface 11 being lower than the convergence point of the sub-beams of the microlens of the reflecting surface 30.

[0101] In Embodiment 2, the height of the lens body is h = 6.2 mm. The distance between the first refractive surface 11 and the opening of the entrance slot 10 is h1 = 3.08 mm, the distance between the first refractive surface 11 and the first array region 41 is h2 = 2.031 mm, the radius of the entrance slot 10 is r1 = 1.2 mm, the radius of the first refractive surface 11 is r2 = 1.06 mm, the draft angle γ of the second refractive surface 12 is 3°, the first refractive surface 11 controls the half-emission angle α of the light beam to be 19°, the focal length f2 of the microlens of the first array region 41 and the focal length f1 of the microlens of the first refractive surface 11 satisfy: f1 = f2 = 1.224 mm, and the divergence angle θ of the multiple sub-beams formed by the convergence of the light rays after passing through the microlens of the reflecting surface 30 on the exit surface 40 is 16°.

[0102] Example 3

[0103] like Figure 14 and Figure 15 As shown, the collimating compound eye mixing lens of Example 3 is described.

[0104] The difference between Embodiment 3 and Embodiment 1 is that each microlens of the reflecting surface 30 focuses the light beam onto the exiting surface 40, and each microlens of the first refractive surface 11 focuses the light beam onto the side of the exiting surface 40 that is closer to the first refractive surface 11. Different exiting angles are achieved by adjusting f1 and f2.

[0105] exist Figure 14 In the specific collimating compound eye mixing lens shown, the height of the lens body is h = 6.2 mm. The distance between the first refractive surface 11 and the opening of the entrance slot 10 is h1 = 3 mm, the distance between the first refractive surface 11 and the first array region 41 is h2 = 3.2 mm, the radius of the entrance slot 10 is r1 = 1.2 mm, the radius of the first refractive surface 11 is r2 = 1.04 mm, the draft angle γ of the second refractive surface 12 is 3°, the first refractive surface 11 controls the half-emission angle α of the beam to be 19.1°, the focal length of the microlens of the first refractive surface 11 is f1 = 1.04 mm, the focal length of the microlens of the first array region 41 is f2 = 0.510 mm, and the divergence angle θ of the multiple sub-beams formed by the convergence of the light rays after passing through the microlens of the reflecting surface 30 on the exit surface 40 is 12°.

[0106] exist Figure 15In the specific collimating compound eye mixing lens shown, the height of the lens body is h = 6.2 mm. The distance between the first refractive surface 11 and the opening of the entrance slot 10 is h1 = 3 mm, the distance between the first refractive surface 11 and the first array region 41 is h2 = 3.2 mm, the radius of the entrance slot 10 is r1 = 1.2 mm, the radius of the first refractive surface 11 is r2 = 1.04 mm, the draft angle γ of the second refractive surface 12 is 3°, the first refractive surface 11 controls the half-emission angle α of the beam to be 19.1°, the focal length of the microlens of the first refractive surface 11 is f1 = 1.04 mm, the focal length of the microlens of the first array region 41 is f2 = 0.452 mm, and the divergence angle θ of the multiple sub-beams formed by the convergence of the light rays after passing through the microlens of the reflecting surface 30 and exiting surface 40 is 24°.

[0107] The present invention also provides a projection optical engine, which includes the above-described collimating compound eye mixing lens.

[0108] This application is equivalent to replacing the collimating lens and compound eye lens with a TIR lens, which reduces the number of components in the illumination module of the projection optical engine, reduces the assembly difficulty and weight of the whole machine, ensures miniaturization and lightweighting, and optimizes the overall cost of the projection optical engine.

[0109] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0110] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0111] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A collimating compound eye light-mixing lens, characterized in that, The lens includes a lens body, the incident side of which has an incident groove (10), the bottom surface of which is a first refractive surface (11), and the sidewall surface of which is a second refractive surface (12). The lens body also includes a reflecting surface (30) and an exiting surface (40), the first refractive surface (11) and the exiting surface (40) being disposed opposite to each other, and the two sides of the reflecting surface (30) being connected to the second refractive surface (12) and the exiting surface (40) respectively. Microlens arrays are provided on the first refractive surface (11), the reflective surface (30), and the exiting surface (40). Each microlens array is composed of multiple microlenses, and the multiple microlenses on different surfaces are different. The microlens array on the exiting surface (40) is divided into a first array region (41) and a second array region (42). The microlens array on the first refractive surface (11) corresponds to the first array region (41), and the microlens array on the reflective surface (30) corresponds to the second array region (42). The first array region (41) is located at the center of the exit surface (40), and the second array region (42) is continuously arranged around the circumference of the first array region (41). The surface where the first array region (41) is located and the surface where the second array region (42) is located are on the same horizontal plane; or there is a height difference between the surface where the first array region (41) is located and the surface where the second array region (42) is located, and the first array region (41) is arranged closer to the first refractive surface (11) relative to the second array region (42); the exit center position of each microlens in the first array region (41) is offset towards the center position of the exit surface (40) based on its basic center position. The focal length f1 of the microlens of the first refractive surface (11) satisfies: Where h1 is the distance between the first refracting surface (11) and the opening of the light inlet groove (10), and h2 is the distance between the first refracting surface (11) and the first array region (41); the divergence angle of the light beam emitted by the microlens through the exiting surface (40) is greater than or equal to 15° and less than or equal to 25°.

2. The collimating compound eye mixing lens according to claim 1, characterized in that, The sum of the number of microlenses on the first refractive surface (11) and the number of microlenses on the reflective surface (30) is equal to the number of microlenses on the exiting surface (40). Furthermore, the multiple microlenses on the first refractive surface (11) are arranged in a one-to-one correspondence with the multiple microlenses in the first array region (41), and the multiple microlenses on the reflective surface (30) are arranged in a one-to-one correspondence with the multiple microlenses in the second array region (42).

3. The collimating compound eye mixing lens according to claim 1, characterized in that, The reflective surface (30) is open-shaped, and the cross-sectional area of ​​the reflective surface (30) parallel to the emission surface (40) gradually increases from the light-incident side to the light-outcident side. The surface of the microlens array on the reflective surface (30) is wavy along the circumference of the lens body and in the direction from the light-incident side to the light-outcident side.

4. The collimating compound eye mixing lens according to claim 3, characterized in that, The microlens array on the reflective surface (30) is circumferentially divided into multiple groups of microlenses along the lens body, each group includes multiple microlenses, and a group of microlenses are arranged in sequence in a direction away from the exit surface (40).

5. The collimating compound eye mixing lens according to claim 1, characterized in that, The convergence points of the multiple microlenses on the reflective surface (30) are all on the second array area (42), and the divergence angle of the outgoing light beam passing through the microlenses on the reflective surface (30) is greater than 1° and less than 25°.

6. The collimating compound eye mixing lens according to any one of claims 1 to 5, characterized in that, The focal lengths of the microlenses at different positions of the reflective surface (30) in the Z-axis direction are different.

7. The collimating compound eye mixing lens according to any one of claims 1 to 5, characterized in that, The lens body further includes an end face (20), the second refraction surface (12) is connected to the reflective surface (30) through the end face (20), the end face (20) is annular, the inner ring side of the annular end face (20) is connected to the second refraction surface (12), and the outer ring side of the annular end face (20) is connected to the reflective surface (30).

8. The collimating compound eye mixing lens according to any one of claims 1 to 5, characterized in that, The height h of the lens body is greater than 0.5 mm and less than 50 mm.

9. The collimating compound-eye mixing lens according to claim 1, wherein The distance between two adjacent microlenses among the multiple microlenses arranged radially in the second array area (42) gradually decreases in a direction away from the first array area (41).

10. The collimating compound eye mixing lens according to any one of claims 1 to 5, characterized in that, The distance h1 between the first refraction surface (11) and the notch of the light-incident groove (1)) satisfies:[[]] where r1 is the radius of the notch of the light-incident groove (10), α is the semi-emission angle of the light beam controlled by the first refraction surface (11), and γ is the draft angle of the second refraction surface (12).

11. The collimating compound-eye mixing lens according to claim 1, wherein The distance h1 between the first refraction surface (11) and the notch of the light-incident groove (10) satisfies: \(0.2\mathrm{mm}<h1<20\mathrm{mm}\); and / or The radius r1 of the notch of the light-incident groove (10) satisfies: \(0.2\mathrm{mm}<r1<2\mathrm{mm}\).

12. The collimating compound-eye mixing lens according to claim 1, wherein The semi-emission angle α of the light beam controlled by the first refraction surface (11) satisfies: \(\alpha<20°\); and / or The draft angle γ of the second refraction surface (12) satisfies: \(0°<γ<20°\).

13. The collimating compound eye mixing lens according to any one of claims 1 to 5, characterized in that, The first refraction surface (II) is circular, and the radius r2 of the circular first refraction surface (11) satisfies:[[]] \(r2 = r1 - h1\cdot anγ = h1\cdot anα\) Formula (2); where r1 is the radius of the notch of the light-incident groove (10), h1 is the distance between the first refraction surface (11) and the notch of the light-incident groove (10), γ is the draft angle of the second refraction surface (12), and α is the semi-emission angle of the light beam controlled by the first refraction surface (11).

14. A projection optical engine, characterized in that, It includes the collimating compound-eye mixing lens according to any one of claims 1 to 13.

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