WO2019205786A1

WO2019205786A1 - Projection device

Info

Publication number: WO2019205786A1
Application number: PCT/CN2019/075615
Authority: WO
Inventors: 王宇
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2018-04-28
Filing date: 2019-02-20
Publication date: 2019-10-31

Abstract

A projection device comprises: a light source, a light guide tube (1), a first spherical lens (32), a second spherical lens (33), an aspheric lens (34), a TIR prism (31), and a digital micromirror device. The light source provides light to the light guide tube (1). The first spherical lens (32) and the second spherical lens (33) are coaxially provided on a light path of first emergent light emitted from the light guide tube (1). The first spherical lens (32) and the second spherical lens (33) converge the first emergent light. The aspheric lens (34) is provided on a light path of second emergent light emitted from the second spherical lens (33), converges the second emergent light, and projects the second emergent light to the TIR prism (31). The TIR prism (31) receives the second emergent light and reflects the second emergent light to the digital micromirror device. The digital micromirror device is used to receive and modulate the second emergent light reflected by the TIR prism, so as to perform projection.

Description

Projection device

This application is required to be submitted to the Chinese Patent Office on April 28, 2018, application number 201810404437.X, the invention name is "a lighting assembly and laser projection device used in a laser projection device" and the application number is 201810404706.2, the name of the invention The priority of the Chinese Patent Application for "A Lighting Assembly for Use in a Laser Projection Apparatus" is hereby incorporated by reference in its entirety.

Technical field

The present disclosure relates to the field of projection technology, and in particular, to a lighting assembly and a laser projection device applied to a laser projection device.

Background technique

A laser projection device is a device that projects images or video onto a screen and is widely used in homes, offices, schools, and entertainment venues. As an emerging projection display technology, laser projection products have higher brightness and lifetime than LED projection products. However, the current laser projection device generally has the problems of large volume and high price, which seriously affects the development of laser cinema. The laser projection device includes a laser light source, a light pipe, a lighting component, a DMD (Digital Micro Mirror Device) chip, and a lens.

Summary of the invention

Some embodiments of the present disclosure provide a projection apparatus including: a light source, a light pipe, a first spherical lens, a second spherical lens, an aspherical lens, a TIR prism, and a digital micromirror element. The light source is configured to provide light to the light pipe. The first spherical lens and the second spherical lens are coaxially disposed on an optical path of the first outgoing light emitted by the light guide, and the first spherical lens and the second spherical lens are configured to be the same An outgoing light converges. The aspherical lens is disposed on an optical path of a second outgoing ray emitted by the second spherical lens, the aspherical lens being configured to converge the second outgoing ray and project the second illuminating ray to The TIR prism. The TIR prism is configured to receive the second emergent ray and reflect the second emergent ray toward the digital micromirror element. The digital micromirror device is configured to receive and modulate the second outgoing light reflected by the TIR prism for projection.

In some embodiments of the present disclosure, a projection apparatus is provided, comprising: a light source, a light guide, a first spherical lens, a second spherical lens, a plane mirror, an aspherical lens, a TIR prism, and a digital micromirror element. The light source is configured to provide light to the light pipe. The first spherical lens and the second spherical lens are coaxially disposed on an optical path of the first outgoing light emitted by the light guide, and the first spherical lens and the second spherical lens are configured to be the same An outgoing light converges. The planar mirror is configured to reflect a second exiting light emitted by the second spherical lens toward the aspherical lens. The light incident surface of the aspherical lens is a convex surface, and the light exiting surface of the aspherical lens is a plane, and a light exiting surface of the aspherical lens is parallel to a light incident surface of the TIR prism. The aspherical lens is configured to converge the second exiting ray reflected by the mirror and to emit a third outgoing ray to the TIR prism. The TIR prism is configured to receive the third outgoing ray and to reflect the third outgoing ray toward the digital micromirror element. The digital micromirror device is configured to receive and modulate the third outgoing light reflected by the TIR prism for projection.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present disclosure, Those skilled in the art can obtain other drawings according to the structures shown in the drawings without any creative work.

1 is a schematic structural view of a lighting assembly of a projection device in the related art;

2 is a schematic structural view of a lighting assembly of a projection device in which a planar mirror is not added in the related art;

3 is a schematic diagram of a lighting assembly applied to a projection device provided in some embodiments of the present disclosure;

4 is a schematic structural view of a lighting assembly in a direction along a direction of light along a direction of light of a light guide according to some embodiments of the present disclosure;

5 is a schematic structural view of a lighting assembly after a light pipe is rotated according to some embodiments of the present disclosure;

Figure 6 is a schematic view of Figure 3 after rotation; and

FIG. 7 is a schematic structural diagram of a laser projection apparatus according to some embodiments of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

It should be noted that all directional indications (such as up, down, left, right, front, back, ...) in the embodiments of the present disclosure are only used to explain between components in a certain posture (as shown in the drawing). Relative positional relationship, motion situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, descriptions in the present disclosure such as "first", "second", and the like are used for descriptive purposes only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present disclosure, the terms "connected", "fixed" and the like should be understood broadly, unless otherwise explicitly stated and defined. For example, "fixed" may be a fixed connection, a detachable connection, or an integral; It may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise. The specific meanings of the above terms in the present disclosure can be understood by those skilled in the art on a case-by-case basis.

In addition, the technical solutions between the various embodiments of the present disclosure may be combined with each other, but must be based on the realization of those skilled in the art, and the combination of the technical solutions should be considered when the combination of technical solutions is contradictory or impossible to implement. It does not exist and is not covered by the protection required by the present disclosure.

FIG. 1 and FIG. 2 are structural diagrams of a lighting assembly in a laser projection apparatus provided by a related art. The scheme uses four spherical lenses, two flat mirrors, and one TIR (Total Internal Reflection) prism. The four spherical lenses are respectively a meniscus lens, a convex spherical lens, a convex spherical lens and a meniscus lens in the direction of light travel. In addition, the frame of the illumination assembly in the laser projection apparatus shown in Figure 1 can incorporate two planar mirrors to ensure an angular relationship between the illumination components.

As shown in FIG. 3, a schematic diagram of a lighting assembly applied to a laser projection device is provided for some embodiments of the present disclosure. The laser projection device includes a laser light source 1, a lighting assembly 3, a DMD (Digital Micro Mirror Device) chip 2, and a lens 4. The illumination assembly 3 includes a light pipe 1, a three-group lens assembly, and a TIR (Total Internal Reflection) prism 31. In Fig. 3, reference numeral 11 denotes a light exit port of the light guide 1, and the laser light emitted from the light source is incident on the light guide 1 (to be homogenized) and then emitted. The light source is configured to provide light to the light pipe 1.

Among them, the three sets of lens assemblies include a first spherical lens 32, a second spherical lens 33, and an aspherical lens 34. The following describes the position and function of each lens as follows:

a first spherical lens 32: located on a path of the first outgoing light emitted from the light pipe 1 for converging the first outgoing light and performing field curvature correction and distortion correction on the first outgoing light;

a second spherical lens 33: located on a path of the second outgoing light emitted from the first spherical lens 32 for converging the second outgoing light and performing field curvature correction and distortion correction on the second outgoing light;

The aspherical lens 34 is located on the path of the third outgoing ray emitted from the second spherical lens 33 for converging the third outgoing ray and performing aberration correction, and projecting the third outgoing ray to the TIR prism 31 to The TIR prism 31 is caused to totally reflect the third outgoing light to the DMD chip 2.

In some embodiments, only two spherical lenses and one aspherical lens 34 are used in the present embodiment, and since the number of lens assemblies is reduced, there is an advantage that the illumination system is miniaturized and cost-effective. By reasonably selecting the lens material, for example, a high refractive index and a slightly lower transmittance than the commonly used materials are selected to ensure that the cost of the single lens is substantially the same as that of the related art. Moreover, by reducing the efficiency of the lens compensation system, and because the aspherical lens has a higher ability to correct light distribution and aberrations, it is possible to reduce the number of lenses in the illumination system, thereby achieving miniaturization and low cost of the illumination system. In this case, the system performance can still be guaranteed to meet the design requirements. In addition, reducing the number of spherical lenses in the illumination assembly helps to reduce the lateral (optical axis direction) dimensions of the illumination system.

In some embodiments, the present disclosure does not limit the specific selection of the first spherical lens 32, the second spherical lens 33, and the aspherical lens 34, and those skilled in the art can select and optimize each lens according to actual conditions. Specific parameters. In order to enable the lens to achieve its corresponding function, the material of the lens and its parameters can be specifically defined. The following examples are merely illustrative for ease of understanding.

In some embodiments, the diopter φ1 of the first spherical lens is positive and satisfies: 17D≤φ1≤56D.

In some embodiments, the diopter φ2 of the second spherical lens is positive and satisfies: 24.5D≤φ2≤33.5D.

In some embodiments of the present disclosure, the refracting power φ1 of the first spherical lens is positive, and satisfies: 17D≤φ1≤56D; while the refracting power φ2 of the second spherical lens is positive, and satisfies: 24.5D≤φ2 ≤ 33.5D. In this way, the deflection angle of the light is made larger, thereby reducing the lateral dimension of the illumination assembly.

In some embodiments of the present disclosure, the first spherical lens 32 is a plano-convex lens or a meniscus lens. If the first spherical lens 32 is a meniscus lens, the concave surface of the meniscus lens can be generally used as the light incident surface, and the convex surface of the meniscus lens can be used as the light exit surface. If the first spherical lens 32 is a plano-convex lens, the plane of the plano-convex lens can be used as a light incident surface, and the convex surface can be used as a light exit surface.

In some embodiments of the present disclosure, the second spherical lens 33 is a plano-convex lens or a lenticular lens. The plano-convex lens or the lenticular lens can further converge the second outgoing ray emitted by the first spherical lens 32 to further reduce the degree of divergence of the light. If the second spherical lens 33 is a plano-convex lens, the plane of the plano-convex lens can be used as the light incident surface, and the convex surface of the plano-convex lens can be used as the light exit surface.

In some embodiments of the present disclosure, the aspherical lens 34 is a plano-convex lens or a lenticular lens. If the aspherical lens 34 is a plano-convex lens, the convex surface of the plano-convex lens can be used as a light-incident surface, and the plane can be used as a light-emitting surface, so that the plane of the plano-convex lens can be directly attached to the light-incident surface of the TIR prism 31 when mounted. To save space and cost. In some embodiments, the plane of the aspherical lens 34 as the light exiting surface may also be parallel to the light incident surface of the TIR prism and have a predetermined distance L1.

In some embodiments of the present disclosure, as shown in FIG. 3, the first spherical lens 32 is a meniscus lens, and the second spherical lens 33 is a lenticular lens having a convex surface and a light emitting surface. The aspherical lens 34 is a plano-convex lens.

In some embodiments of the present disclosure, the first spherical lens 32 is a meniscus lens, and the lens material is made of a high refractive index bismuth glass to further increase the deflection angle of the light.

In some embodiments of the present disclosure, the lenses of the first spherical lens 32 and the second spherical lens 33 are made of neodymium glass. Of course, the lens materials of the first spherical lens 32 and the second spherical lens 33 can also be selected from other lens materials. The disclosure may not specifically limit the lens materials of the two, and the change of the lens material does not affect the protection scope of the disclosure.

In some embodiments of the present disclosure, the refractive indices of the materials of the first spherical lens 32 and the second spherical lens 33 range from 1.6 to 1.8. In some embodiments, the refractive index of the first spherical lens 32 needs to satisfy 1.60 ≤ S1 ≤ 1.85; the refractive index of the second spherical lens 33 needs to satisfy: 1.60 ≤ S2 ≤ 1.85.

In some embodiments of the present disclosure, the first spherical lens 32 and the second spherical lens 33 are made of neodymium glass.

In some embodiments of the present disclosure, at least one of the first spherical lens 32 and the second spherical lens 33 is made of neodymium glass.

In some embodiments of the present disclosure, the aspherical lens 34 is conveniently mass-produced using a low melting point glass for ease of molding. For example, the glass in the list below can be used.

D-K59D-K59
D-ZK2D-ZK2
D-ZK3D-ZK3
D-LaK6D-LaK6
D-LaF50D-LaF50
D-ZLaF52LAD-ZLaF52LA

In some embodiments of the present disclosure, the thickness H1 of the first spherical lens 32 satisfies: 7.2 mm ≤ H1 ≤ 12.6 mm. In some embodiments, the first spherical lens 32 has a thickness of 8 mm to 12 mm, with the first spherical lens 32 enhancing the ability to correct field curvature.

In some embodiments of the present disclosure, the thickness H2 of the second spherical lens 33 satisfies: 7.2 mm ≤ H2 ≤ 12.6 mm. In some embodiments, the first spherical lens 32 has a thickness of 8 mm to 12 mm, with the first spherical lens 32 enhancing the ability to correct field curvature.

In some embodiments of the present disclosure, to further reduce the size of the illumination assembly, the optical path is deflected using a planar mirror to reduce the overall length of the illumination assembly. For example, a plane mirror 35 is provided on the exit path of the third outgoing light emitted by the second spherical lens for folding the third outgoing light to the TIR prism 311.

In some embodiments, in order to match the transition of the planar mirror to the optical path, the planar mirror 35 is at an angle of 45 degrees to the plane of the second spherical lens 33, respectively.

In some embodiments, the plane of the optical axis of the second spherical lens 33 is perpendicular to the plane of the optical axis of the aspheric lens 34. The optical axis of the second spherical lens 33 and the aspherical lens 34 are perpendicular to each other and are at an angle of 45 with the plane in which the mirror 35 is located.

In some embodiments, the main optical axis of the first spherical lens 32 is perpendicular to the main optical axis of the aspheric lens 34, the angle between the main optical axis of the first spherical lens 32 and the plane in which the planar mirror 35 is located, and the aspheric lens. The angle between the main optical axis of 34 and the plane in which the planar mirror 35 is located is 45°.

In some embodiments, the plane mirror 35 is deflected by the light beam emitted by the second spherical lens 33 and then emitted to the aspherical lens 34, 85° ≤ θ ≤ 125°.

In some embodiments of the present disclosure, the illumination assembly may take the structure as shown in FIG. 5, wherein the illumination assembly is generally L-shaped and employs two spherical lenses, one aspherical lens, and one planar mirror + TIR. The lighting architecture of the prism. In the first direction, the light pipe 1 and the two spherical lenses (32 and 33) are sequentially aligned with the optical axis, and in the second direction, the aspherical lens 34 and the TIR prism 311 are sequentially disposed, and the plane mirror 35 is located in the first direction and The position where the second direction intersects is used to refract the third outgoing light in the first direction, which is emitted from the second spherical lens 33, to the second direction, and enters the aspherical lens 34 and the TIR prism 31. In this way, the components can be distributed in the first and second directions, which contributes to the miniaturization of the lighting assembly. The angle between the first direction and the second direction is about 90 degrees.

In some embodiments of the present disclosure, a central axis of the light pipe 1 coincides with a main optical axis of the first spherical lens 32 and the second spherical lens 33, and a central axis of the light pipe 1 The direction is configured such that the third outgoing light reflected by the TIR prism 31 satisfies the direction requirement of the incident light by the horizontally or vertically arranged DMD chip 2. When the DMD chip 2 is horizontally or vertically arranged, it is easier to fix and reduce the cost.

In some embodiments of the present disclosure, the TIR prism 31 is an irregular obtuse triangle. Referring to Figures 1-3, it is assumed that the apex angle of the reflected oblique side of the TIR prism 31 is β, β ≥ 90°, and if the light-emitting surface 311 of the TIR prism 31 is to be arranged parallel to the horizontal plane, the light The central axis of the catheter needs to be β-90° from the horizontal. At this time, the DMD chip 2 can be arranged in parallel to the light exit surface 311 of the TIR prism 31.

In some embodiments, a dual telecentric illumination system is taken as an example for illustration. The double telecentric optical system means that both the object side and the image side are optical systems of the telecentric structure, that is, the principal rays of the object side or the image side are parallel to the optical axis, and the convergence center of the object main rays is infinitely located at the image side. At the same place, the center of convergence like the main light is at the infinity of the object. When the plane mirror 35 is not added, for example, when the first spherical lens 32, the second spherical lens 33, and the aspheric lens 34 are coaxial, the first spherical lens, the second spherical lens, and the aspheric lens are parallel to each other. The double spherical lens is located between the first spherical lens and the aspherical lens, and the aspherical lens is located between the second spherical lens and the TIR prism. As shown in FIG. 4, the DMD surface 21 of the DMD chip 2 is inclined with respect to the horizontal plane. Let the angle α, α = β - 90 °, and β be the apex angle corresponding to the reflected oblique side of the TIR prism 31. The inclination of the DMD face 21 is due to the shape of the TIR prism 31. When the TIR prism 31 is an obtuse triangle (that is, when the angle between the incident surface of the TIR prism and the light exiting surface is an obtuse angle), the light exiting surface 311 of the TIR prism 31 (i.e., the bottom surface of the obtuse triangle in the figure) has an angle α with the horizontal plane. Since the DMD chip 2 is generally disposed parallel to the light exit surface 311 of the TIR prism 31, there is a certain inclination angle α between the DMD surface 21 and the horizontal plane.

In some embodiments, taking a non-telecentric system as an example, the illumination system includes a first spherical lens 32 and a second spherical lens 33 having optical axes along a first direction, a planar mirror 35, and an aspheric surface of the optical axis along the second direction The lens 34, and a TIR prism 31 disposed in the light exiting direction of the aspherical lens and a DMD element disposed in the light emitting direction of the TIR prism. The planar mirror 35 is configured to reflect light emerging from the second spherical lens 33 toward the aspherical lens 34, in some embodiments, the first direction is perpendicular to the second direction, the first direction and the second direction and the planar mirror 35 The plane of the plane is 45°. In some embodiments, with the plane in which the DMD is located as a reference surface, the angle between the light-emitting surface of the TIR prism and the reference surface is α, and the angle at which the light guide 1 rotates about its optical axis in the first direction is also α. In some embodiments, the light pipe has a rectangular cross section, and the angle of rotation of the light pipe about its optical axis in the first direction is the angle between the long side or the short side of the cross section and the reference surface.

In some embodiments, the reference plane is a horizontal plane.

In some embodiments of the present disclosure, to compensate for the tilt of the DMD face 21 while ensuring miniaturization of the illumination assembly, the manner in which the light pipe 1 is rotated may be employed to cause the illumination assembly to use only one planar mirror 35. When the entire optical path shown in FIG. 3 is rotated counterclockwise by α, as shown in FIG. 6, the light-emitting surface of the prism 31 can be rotated into the horizontal plane. At this time, the DMD surface 21 can be arranged in parallel with the light exit surface, that is, the so-called DMD chip 2 is horizontally disposed.

The lighting assembly is constructed in accordance with the optical path diagram shown in Figure 6 to form the illumination system. Corresponding to the drawing shown in Fig. 4, the light exit opening of the light pipe 1 needs to be raised by α, that is, the light pipe 1 needs to be rotated counterclockwise by α when viewed in the negative direction of the Y-axis in the plane determined by the X-axis and the Z-axis.

In some embodiments of the present disclosure, as shown in FIG. 4, at this time, the light pipe 1 has an inclination angle α with respect to a horizontal plane, and the DMD surface 21 is rotated counterclockwise by a plane determined by the X-axis and the Y-axis shown in FIG. At this time, the DMD surface 21 is parallel to the horizontal plane. The rotation of the DMD face 21 is counteracted by rotating the light pipe 1, i.e., α-α=0. This not only reduces the longitudinal dimension of the illumination assembly 3, but also reduces the cost of a single planar mirror.

In some embodiments, the cross section of the light pipe is rectangular, and the angle of the light guide light relative to the horizontal plane refers to the angle between the long side or the short side of the cross section of the light pipe relative to the horizontal plane. In some embodiments, the horizontal plane is not limited to The reference plane in the direction of gravity may also be a reference plane, which may be a plane on which the DMD is mounted.

The illumination assembly provided in this embodiment replaces two planar mirrors in the related art illumination assembly by using a single plane mirror 35, which reduces the longitudinal height of the illumination assembly, thereby reducing the volume and cost of the laser projection device. Based on this, other equivalent modifications may be made by those skilled in the art, and these are all within the scope of the disclosure.

In some embodiments of the present disclosure, an aperture stop may also be disposed between the second spherical lens and the planar mirror for blocking stray light and preventing stray light from entering the lens. The light pipe 1 homogenizes the incident light incident into the illumination unit 3 by multiple reflections, and the first spherical lens 32 and the second spherical lens 33 converge the light at the aperture stop, and the light passing through the aperture stop is reflected by the plane The mirror 35 is folded, and the incident light is again concentrated by the aspherical lens 34, and is totally reflected by the TIR prism 31 onto the DMD chip 2. The DMD chip 2 projects the light onto the lens for imaging.

In some embodiments, the spacing of the aperture stop from the second spherical lens is in the range of 0.3 mm to 9 mm. In some embodiments, the aperture stop is spaced from the second spherical lens by a distance of from 3 mm to 7 mm. In some embodiments, the aperture stop may not be provided, and the exit face of the second spherical lens 33 is an aperture stop. In some embodiments, the aperture stop includes an elliptical through hole, and a long axis direction of the elliptical through hole corresponds to a longitudinal direction of the light guide light exit opening 11, and a short axis of the elliptical through hole The direction corresponds to the short side direction of the light guide light exit opening 11.

In some embodiments of the present disclosure, a new illumination assembly is provided that includes a first spherical lens 32, a second spherical lens 33, and an aspheric lens 34, wherein the first spherical lens 32 is a meniscus lens and the second spherical surface The lens is a convex spherical lens and an aspherical lens 34.

In this embodiment, the selection of the material and the matching of different types of lenses are used to reduce the spherical lens in the illumination system, thereby reducing the lateral size of the illumination system. For example, the refractive index of the material can be increased by selecting an environmentally friendly glass. The thicknesses of the first spherical lens 32 and the second spherical lens 33 may be increased.

In some embodiments, the parameters of the aspherical lens 34 are as shown in Table 1.

Table 1: Lens parameters of aspherical lenses

The expression of the aspherical lens shown in Table 1 is as follows:

Where K represents the conic coefficient, CURV represents the radius of curvature, and Y represents the radial radius. The aspherical coefficient A2 of the aspherical lens is 0, the aspherical coefficient A4 of 4 times is 3.64E-05, and the aspherical coefficient A6 of 6 times is -8.24E-08, 8 aspherical coefficients The value of A8 is 8.9E-11.

In some embodiments, the aspherical lens selects a plano-convex lens to facilitate structural assembly. The aspherical lens selects a plano-convex lens, and the plane of the plano-convex lens is close to the TIR prism. When the volume of the illumination system needs to be further compressed, the plane of the plano-convex lens can be placed on the TIR prism without leaving a gap.

In some embodiments, the light incident surface of the aspherical lens 34 is convex and the light exiting surface is planar. The plane of the exit surface of the aspherical lens 34 is disposed adjacent to the TIR prism 31, for example, attached to the TIR prism 31 to compress the volume of the illumination assembly and facilitate structural assembly.

In some embodiments, the distance L1 between the light-emitting surface of the aspherical lens 34 and the light-incident surface of the TIR prism 31 satisfies: 0 mm ≤ L1 ≤ 3.6 mm. This ensures that the light beams emitted from the aspherical lens 34 are all emitted to the TIR prism 31 to the utmost extent. It also further shortens the lateral dimensions of the lighting assembly.

In some embodiments, the distance from the plane mirror 35 to the second spherical lens 33 is equal to the distance from the plane mirror 35 to the aspheric lens 34.

In some embodiments of the present disclosure, as shown in FIG. 3, the first spherical lens 32, the second spherical lens 33, and the aspherical lens 34 and the TIR prism 31 are sequentially arranged. The aspherical lens 34 is located between the second spherical lens 33 and the TIR prism 31, that is, there is no plane mirror 35 between the second spherical lens 33 and the aspherical lens 34. In this case, the aberration of the illumination component can be eliminated by reasonably selecting the material and type of each lens, and the dual telecentric architecture is used to ensure the illumination uniformity of the illumination component.

Based on the above disclosed concept, the present disclosure also proposes a laser projection apparatus, as shown in FIG. 7, the laser projection apparatus comprising a laser light source 1, an illumination assembly 3 of any of the above, a DMD chip 2 and a lens 4, wherein:

The laser light source 1 passes through the illumination assembly 3 and exits to the DMD chip 2;

The DMD chip 2 is configured to modulate the light beam emitted from the illumination assembly 3 to modulate the image signal and then exit the lens 4 for imaging.

In some embodiments, the DMD chip 2 includes a DMD face 21 having a vertical axis direction parallel to the optical axis of the lens 4, and the DMD chip 2 is for receiving light incident from the TIR prism 31 and projecting the light. The lens 4 is used to receive and image the light emitted by the DMD chip 2, and the curved mirror is used to transmit the imaging of the lens to the projection screen.

In some embodiments, the DMD chips 2 are arranged in parallel. In this case, the light guide tube 1 is rotated so that the DMD chips 2 can be arranged in parallel.

In some embodiments of the present disclosure, the angle between the upper surface of the light pipe 1 and the plane of the DMD chip 2 is β, 18° ≤ β ≤ 30°.

In some embodiments of the present disclosure, the optical axis direction of the second spherical lens 33 is perpendicular to a plane in which the DMD chip is located.

In summary, the solution reduces the lateral dimension and the longitudinal height of the lighting component by reducing the number of lenses and using special lenses, and also reduces the overall cost, thereby solving the lighting component while ensuring that the performance of the laser projection device is not affected. The problem of large size and high cost.

In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above is only the specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the disclosure. It should be covered within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be determined by the scope of the claims.

Claims

A projection apparatus comprising: a light source, a light guide, a first spherical lens, a second spherical lens, an aspherical lens, a TIR prism, and a digital micromirror element; wherein

The light source is configured to provide light to the light pipe;

The first spherical lens and the second spherical lens are coaxially disposed on an optical path of the first outgoing light emitted by the light guide, and the first spherical lens and the second spherical lens are configured to be the same An outgoing light converges;

The aspherical lens is disposed on an optical path of a second outgoing ray emitted by the second spherical lens, the aspherical lens being configured to converge the second outgoing ray and project the second illuminating ray to The TIR prism;

The TIR prism is configured to receive the second outgoing light and reflect the second outgoing light toward the digital micromirror element;

The digital micromirror device is configured to receive and modulate the second outgoing light reflected by the TIR prism for projection.
The projection apparatus according to claim 1, wherein the refracting power φ1 of the first spherical lens is positive and satisfies: 17D ≤ φ1 ≤ 56D; and/or the diopter φ2 of the second spherical lens is positive, and Satisfied: 24.5D ≤ φ2 ≤ 33.5D.
The projection apparatus according to claim 1, wherein the refracting power φ3 of the aspherical lens is positive and satisfies: 22.5D ≤ φ3 ≤ 29.5D.
The projection apparatus according to claim 1, wherein the aspherical lens is a plano-convex lens, and an outer convex surface of the plano-convex lens is a light incident surface, and a plane of the plano-convex lens is a light-emitting surface, and the aspheric surface The light exit surface of the lens is parallel to the light incident surface of the TIR prism.
The projection apparatus according to claim 4, wherein a light-emitting surface of the aspherical lens is in contact with a light-incident surface of the TIR prism.
The projection apparatus according to any one of claims 1 to 5, further comprising a plane mirror,

a main optical axis of the first spherical lens and a main optical axis of the second spherical lens are coincident;

The main optical axis of the aspherical lens and the main optical axis of the first spherical surface do not coincide;

The planar mirror is disposed on the optical path of the second outgoing light emitted from the second spherical lens, and the planar mirror is configured to reflect the second outgoing light emitted by the second spherical lens toward the An aspherical lens.
The projection apparatus according to claim 6, wherein a main optical axis of the first spherical lens is perpendicular to a main optical axis of the aspheric lens, and a main optical axis of the first spherical lens and a plane mirror are located The angle between the plane and the angle between the main optical axis of the aspherical lens and the plane in which the planar mirror is located is 45°.
The projection apparatus according to claim 6, wherein the plane mirror deflects the light beam emitted from the second spherical lens and emits the light beam to the aspherical lens, 85° ≤ θ ≤ 125°.
The projection apparatus according to claim 1, wherein a central axis of the light guide is opposite to a main optical axis of the first spherical lens, a main optical axis of the second spherical lens, and a main light of the aspheric lens The axes are all coincident.
The projection apparatus according to claim 9, wherein a reflection oblique side of the TIR prism corresponds to an apex angle of β and β ≥ 90°, and a light exit surface of the TIR prism is parallel to a mounting plane of the DMD chip;

The central axis of the light pipe is β-90° to the mounting plane of the DMD chip.
The projection apparatus according to claim 2, wherein the thickness H1 of the first spherical lens satisfies: 7.2 mm ≤ H1 ≤ 12.6 mm.
The projection apparatus according to claim 11, wherein the thickness H2 of the second spherical lens satisfies: 7.2 mm ≤ H2 ≤ 12.6 mm.
The projection apparatus according to claim 1, wherein a material refractive index of the first spherical lens and the second spherical lens ranges from 1.6 to 1.8.
The projection apparatus according to claim 1, wherein the first spherical lens and the second spherical lens are made of neodymium glass.
The projection apparatus according to claim 1, wherein a distance L1 between a light-emitting surface of the aspherical lens and a light incident surface of the TIR prism satisfies: 0 mm ≤ L1 ≤ 3.6 mm.
The projection apparatus according to claim 6, wherein an aperture stop is further disposed between the second spherical lens and the plane mirror.
The projection apparatus according to claim 16, wherein a pitch of the aperture stop and the second spherical lens is 0.3 mm to 9 mm.
The projection device according to claim 17, wherein the aperture of the aperture stop is an ellipse;

The light guide light exit opening includes a long side and a short side, and a long axis direction of the ellipse corresponds to a longitudinal direction of the light guide light exit opening, and a short axis direction of the ellipse and a short side of the light guide light exit opening The direction corresponds.
A projection device comprising: a light source, a light guide, a first spherical lens, a second spherical lens, a plane mirror, an aspheric lens, a TIR prism, and a digital micromirror element; wherein

The light source is configured to provide light to the light pipe;

The first spherical lens and the second spherical lens are coaxially disposed on an optical path of the first outgoing light emitted by the light guide, and the first spherical lens and the second spherical lens are configured to be the same An outgoing light converges;

The planar mirror is configured to reflect a second outgoing light emitted by the second spherical lens toward the aspheric lens;

The light incident surface of the aspherical lens is a convex surface, the light emitting surface of the aspherical lens is a plane, and the light emitting surface of the aspherical lens is parallel to a light incident surface of the TIR prism, and the aspherical lens is configured to The second outgoing light reflected by the mirror is converged and the third outgoing light is emitted to the TIR prism;

The TIR prism is configured to receive the third outgoing light and reflect the third outgoing light toward the digital micromirror element;

The digital micromirror device is configured to receive and modulate the third outgoing light reflected by the TIR prism for projection.
A projection apparatus according to claim 19, wherein a main optical axis of said first spherical lens is perpendicular to a main optical axis of said aspheric lens, a main optical axis of said first spherical lens and said planar mirror The angle between the plane and the main optical axis of the aspheric lens and the plane of the plane mirror are both 45 degrees.