CN109270703B - Speckle-dissipating light path and three-color laser projection system - Google Patents

Speckle-dissipating light path and three-color laser projection system Download PDF

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Publication number
CN109270703B
CN109270703B CN201811392309.4A CN201811392309A CN109270703B CN 109270703 B CN109270703 B CN 109270703B CN 201811392309 A CN201811392309 A CN 201811392309A CN 109270703 B CN109270703 B CN 109270703B
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diffusion
reflecting mirror
mirror
reflecting
speckle
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CN109270703A (en
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何龙
姜银磊
梁其鹏
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Sichuan Changhong Electric Co Ltd
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Sichuan Changhong Electric Co Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Abstract

The invention discloses a speckle-dissipating light path and a three-color laser projection system, and relates to the technical field of laser display. The device comprises a reflection light path component, a dynamic spot dissipation device and a light bar; the dynamic speckle-dissipating device comprises a diffusion part and a driving part connected with the diffusion part; the reflecting light path component focuses the laser beam transmitted through the diffusion component on the inlet of the optical rod after at least one reflection. The light path is turned for many times by the reflection light path component, and the function of a plurality of dynamic spot-dissipating devices is realized by only one dynamic spot-dissipating device, so that a better spot-dissipating effect is achieved. The laser spot-dissipating light path provided by the invention has a simple structure, and the light path design of reflection or refraction and reflection combination enables the optical-mechanical structure to be more compact, thereby being easy to realize the miniaturization of a three-color laser projection system.

Description

Speckle-dissipating light path and three-color laser projection system
Technical Field
The invention relates to the technical field of laser display, in particular to a speckle-dissipating light path and a three-color laser projection system.
Background
Laser projection is a newly developed projection technology, in which a diode laser is used as a light source, light is homogenized by an illumination system and then projected onto a light modulation chip (DMD, LCD, LCOS, etc.), and then the homogenized light is imaged on an image plane through a projection lens. The speckle effect in laser projection display is caused by high coherence of laser, when a coherent light source irradiates a rough object, scattered light is constant in phase difference, the light wave frequency is the same, the vibration directions are consistent, interference is generated in the space, some parts of interference are long, some parts of interference are destructive, and the final result is that light and dark spots are generated on a screen, namely the speckles.
The spot dissipation scheme in the existing laser projection display technology is as follows: a plurality of dynamic or static diffusion parts are arranged in an illumination light path, or speckle elimination processing is carried out in a dynamic and static part combination mode, the speckle elimination effect achieved by the speckle elimination mode in three-color laser display still cannot meet the display requirement, and the more dynamic speckle elimination parts are used, so that the cost is higher, the noise is higher, the speckle elimination scheme still needs to be further optimized, and the optimal speckle elimination effect is achieved.
Disclosure of Invention
The invention aims to provide a spot-dissipating light path and a three-color laser projection system aiming at the background technology, so as to realize a better spot-dissipating effect.
In order to achieve the technical effects, the invention adopts the following technical scheme:
an speckle-dissipating optical path comprising a reflective optical path component, a dynamic speckle-dissipating device, and an optical wand; the dynamic speckle-dissipating device comprises a diffusion part and a driving part connected with the diffusion part; the reflecting light path component focuses the laser beam transmitted through the diffusion component on the inlet of the optical rod after at least one reflection.
Further, the reflection light path component comprises a first reflecting mirror and a second reflecting mirror, the diffusion component is arranged between the first reflecting mirror and the second reflecting mirror, and the first reflecting mirror and the second reflecting mirror form a reflection light path to focus the laser beam which penetrates through the diffusion component on the inlet of the optical rod after twice reflection.
Further, at least one of the first reflecting mirror and the second reflecting mirror is a curved mirror or at least one of the first reflecting mirror and the second reflecting mirror is a plane mirror.
Furthermore, the diffusion part is at least one square diffusion sheet, and the driving part is a vibration controller and drives the diffusion part to perform periodic motion according to a preset track.
Further, the diffusion member is at least one vertically arranged square diffusion sheet, the first reflecting mirror is used for reflecting the laser beam transmitted through the square diffusion sheet and passing through the square diffusion sheet again, and the second reflecting mirror is used for reflecting the laser beam passing through the square diffusion sheet twice and passing through the square diffusion sheet again and focusing on the entrance of the light bar.
Further, the first reflecting mirror and the second reflecting mirror are both curved mirrors.
Further, the first reflector is a plane mirror, and a first condensing lens for collecting light is arranged in a light path in front of the square diffusion sheet; the second reflecting mirrors are all curved mirrors. The lens can not only play a role of turning the light path, but also replace the lens to achieve the purpose of light collection and condensation.
Furthermore, the first reflector and the second reflector are plane mirrors, and a first condensing lens for collecting light is arranged in a light path in front of the square diffusion sheet; a second light-condensing lens for collecting light is arranged in the light path behind the square diffusion sheet, and the second light-condensing lens is arranged between the square diffusion sheet and the light rod.
Further, the diffusion component is at least one vertically arranged square diffusion sheet, the first reflector is used for reflecting the laser beams which penetrate through the square diffusion sheet and then passing through the square diffusion sheet again, and the second reflector is used for reflecting the laser beams which pass through the square diffusion sheet twice and directly focusing the laser beams at the inlet of the light bar.
Furthermore, the diffusion part is at least one obliquely arranged square diffusion sheet, and the first reflecting mirror and the second reflecting mirror are both curved mirrors; the first reflecting mirror is used for reflecting the laser beam which is transmitted through the square diffusion sheet and passes through the square diffusion sheet again, and the second reflecting mirror is used for reflecting the laser beam which passes through the square diffusion sheet twice and directly focusing the laser beam at the entrance of the light rod.
Further, the incidence angle of the square diffusion sheet and the incident laser beam is between 0 and 75 degrees.
Further, the diffusion member may vibrate in any direction of three coordinate axes of x, y, and z, in only one direction of the x, y, and z axes, or in any plane of the xy, yz, and xz planes.
Further, the diffusion component is a circular diffusion sheet, and the driving component is a motor; the circular diffusion sheet is coaxially connected with the motor, and the motor drives the circular diffusion sheet to rotate around the shaft at a high speed.
Further, the first reflecting mirror is used for reflecting the laser beam transmitted through the circular diffusion sheet and passing through the circular diffusion sheet again, and the second reflecting mirror is used for reflecting the laser beam secondarily passed through the circular diffusion sheet and passing through the circular diffusion sheet again and focusing on the entrance of the light rod.
Further, the first reflecting mirror and the second reflecting mirror are both curved mirrors.
Further, the first reflecting mirror and the second reflecting mirror are respectively arranged on two sides of the motor rotating shaft.
Further, the first reflector and the second reflector are respectively arranged on the same side of the motor rotating shaft.
Furthermore, the reflection light path component comprises an ellipsoidal mirror and a first focusing lens, the diffusion component is arranged between the ellipsoidal mirror and the first focusing lens, and the first focusing lens and the ellipsoidal mirror form a reflection light path which focuses the laser beam which penetrates through the diffusion component on the inlet of the optical rod after being reflected.
Furthermore, the diffusion part is a square diffusion sheet, the driving part is a vibration controller, and the diffusion part is driven to periodically move according to a preset track; the first focusing lens focuses the laser beam on the first focus of the ellipsoidal mirror, and the laser beam passing through the square diffusion sheet is focused on the second focus of the ellipsoidal mirror by reflection of the ellipsoidal mirror, then passes through the diffusion member and is focused on the entrance of the light rod.
Further, the diffusion component is a circular diffusion sheet, and the driving component is a motor; the circular diffusion sheet is coaxially connected with a motor, and the motor drives the circular diffusion sheet to rotate around a shaft at a high speed; the first focusing lens focuses the laser beam on the first focus of the ellipsoidal mirror, and the laser beam passing through the square diffusion sheet is focused on the second focus of the ellipsoidal mirror by reflection of the ellipsoidal mirror, then passes through the diffusion member and is focused on the entrance of the light rod.
Furthermore, the diffusion part is arranged in parallel with the end face of the ellipsoidal mirror, and the diffusion part is positioned in the range of +/-5 mm of the first focal point and the second focal point of the ellipsoidal mirror.
Furthermore, an included angle between the optical axis of the first condensing lens and the surface normal of the diffusion part is alpha, an included angle between the optical axis after being reflected by the ellipsoidal mirror and the surface normal of the diffusion part is beta, and the alpha and the beta are within the range of 0-75 degrees.
Further, the α and β angles are equal.
Furthermore, the optical rod is located at the focus position of the emergent light, and the entrance end of the optical rod is perpendicular to the optical axis of the light beam incident to the optical rod.
Furthermore, the diffusion part is a glass or quartz diffusion sheet, and is a single-sided or double-sided diffuse diffusion surface.
Furthermore, the surfaces of the first reflector and the second reflector are plated with dielectric reflecting films or metal reflecting films.
Further, the first focusing lens and the second focusing lens are a single lens or a lens group.
The invention also provides a three-color laser projection system which comprises the speckle-dissipating light path, a green laser array, a red laser array, a blue laser array, a light-combining assembly, a telescopic assembly and a light bar; the red laser array, the green laser array and the blue laser array respectively emit red, green and blue laser beams, light combination is completed through the light combination assembly, the aperture of the light beams is compressed through the remote observation assembly and then enters the spot dissipation light path, and the laser beams are reflected and diffused for multiple times in the spot dissipation light path and then are focused on the entrance of the light bar. Through the dodging of the light rod and the shaping of the shaping lens group, light beams irradiate the surface of the display chip, and after being reflected by a micro mirror on the surface of the chip, laser beams penetrate through the lens to be imaged.
In particular, the technical scheme of the speckle-eliminating light path can be applied to a single-chip, double-chip or three-chip DMD projection display system, or an LCD (liquid crystal display) or LCOS (liquid crystal on silicon) projection display system.
The dynamic speckle dispersing device comprises a diffusion part and a driving part, wherein the diffusion part is a square or circular sheet type diffusion sheet made of transparent materials such as glass or quartz and is a single-sided or double-sided diffuse scattering surface; when the diffusion part is a square diffusion sheet, the driving part is a vibration controller and drives the diffusion part to periodically move according to a preset track; when the diffusion part is a wafer type diffusion sheet, the driving part is a motor and drives the diffusion part to perform periodic rotation motion;
the dynamic speckle eliminating device is positioned between the first reflecting mirror and the second reflecting mirror, and a dielectric reflecting film or a metal reflecting film is plated on the surface of the reflecting mirror. The laser beam emitted by the laser source irradiates the diffusion component and transmits, the transmitted laser beam irradiates the first reflecting mirror, the first reflecting mirror reflects the laser beam and transmits the laser beam for the second time through the diffusion component, the laser beam irradiates the second reflecting mirror, and after being reflected, the laser beam transmits the diffusion component for the third time and focuses on the light rod inlet. Through the reflection and turning of the light path, the laser beam can penetrate through the diffusion part for two or more times, the effect of two or more than three dynamic speckle-eliminating devices can be achieved by using one dynamic speckle-eliminating device, a better speckle-eliminating effect can be achieved, meanwhile, the reflection of the light cannot generate chromatic aberration, and the problem of chromatic aberration of the red, green and blue laser can be reduced.
The light bar is a hollow rectangular body or a conical body;
preferably, the diffusion component of the dynamic speckle reduction device is arranged perpendicular to the incident laser beam, and the incident beam is parallel light.
The further technical scheme is as follows: the first reflector is an ellipsoid, a first focusing lens is arranged in front of the diffusion part, the laser beam is focused on a first focus of the ellipsoid by the focusing lens, and the laser beam is focused on a second focus after being reflected by the ellipsoid; the diffusion part is arranged in parallel with the end face of the ellipsoidal reflecting surface and is positioned in the range of +/-5 mm of the first focal point and the second focal point of the ellipsoidal reflecting surface.
The invention also provides a three-color laser projection system which comprises the speckle-dissipating light path, a green laser array, a red laser array, a blue laser array, a light combining assembly, a telescopic assembly and a light bar; the green, red and blue laser arrays emit green, red and blue laser beams, light combination is completed through the light combination assembly, the aperture of the light beams is compressed through the telescopic assembly and then enters the speckle eliminating light path, the laser beams are diffused for multiple times in the speckle eliminating light path and then are focused at the entrance of the light rod, the light beams irradiate the surface of the display chip through dodging of the light rod and shaping of the shaping lens group, and the laser beams are reflected by a micro mirror on the surface of the chip and then penetrate through the lens for imaging.
In particular, the technical scheme of the speckle-eliminating light path can be applied to a single-chip, double-chip or three-chip DMD projection display system, or an LCD (liquid crystal display) or LCOS (liquid crystal on silicon) projection display system.
The invention has the beneficial effects that: in the speckle eliminating light path provided by the invention, the dynamic speckle eliminating device is used in combination with the two reflectors, so that laser beams can penetrate through the diffusion part for two or more times after being reflected, and the space position range of phase change is enlarged due to the fact that the light rays pass through different diffusion areas after being reflected, and the speckle effect is weakened; the effect of two or three dynamic speckle eliminating devices can be achieved by only one dynamic speckle eliminating device, and under the same speckle eliminating effect, the number of the dynamic speckle eliminating devices can be reduced, so that the cost is saved, and the system noise can be reduced; meanwhile, the reflector can turn the light path, reduce the volume of the light path and the chromatic aberration, and is beneficial to the light receiving of the system.
Drawings
FIG. 1 is a schematic diagram of an optical path for resolving an evanescent spot in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of an evanescent spot light path after a diffusion sheet is reduced in size in example 1 of the present invention;
fig. 3 is a schematic diagram of an evanescent spot light path in which the first reflecting mirror is a plane reflecting mirror in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram showing an evanescent spot light path in which the first reflecting mirror and the second reflecting mirror are both plane reflecting mirrors in embodiment 1 of the present invention;
FIG. 5 is a schematic diagram showing an optical path of an evanescent spot in example 1 of the present invention in which a diffusing member is disposed obliquely with respect to an incident laser beam;
FIG. 6 is a schematic view of the vibration direction of the square diffusion member according to the present invention;
FIG. 7 is a schematic view of the vibration locus of a square diffusion member of the present invention in the xy plane;
FIG. 8 is a schematic diagram showing an optical path of an evanescent spot in embodiment 2 of the present invention;
FIG. 9 is a schematic diagram showing an evanescent spot light path in which a first mirror and a second mirror are respectively disposed on both sides of a rotation shaft of a motor in embodiment 2 of the present invention;
FIG. 10 is a schematic view of a wafer type diffusion sheet in example 2 of the present invention;
FIG. 11 is a schematic diagram showing an optical path of an evanescent spot in embodiment 3 of the present invention;
fig. 12 is a schematic diagram of an evanescent spot light path in which an included angle between the optical axis of the first condensing lens and the surface normal of the diffusing member is α according to embodiment 3 of the present invention;
fig. 13 is a schematic diagram of an optical path for dissipating speckle and a three-color projection system in embodiment 4 of the present invention.
Description of the drawings: 101-red laser array, 102-green laser array, 103-blue laser array, 104-light combination component, 20-telescopic component, 30-speckle elimination optical path, 301-vibration controller, 302-diffusion component, 303-first reflector, 304-second reflector, 305-first condenser lens, 306-second condenser lens, 307-motor, 308-ellipsoidal mirror, 309-first focus, 310-second focus, 40-optical rod, 50-shaping lens group, 60-TIR prism, 70-display chip and 80-lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention, the described embodiments being merely a subset of the invention and not all embodiments.
Example (b):
an speckle-evanescents optical path comprising a reflective optical path component, a dynamic speckle-evanescents device and an optical wand 40; the dynamic speckle reduction device comprises a diffusion component 302 and a driving component connected with the diffusion component 302; the reflective optical path component focuses the laser beam transmitted through the diffusion component 302 on the entrance of the optical wand 40 after at least one reflection.
Further technical solution is that the reflective optical path component includes a first reflecting mirror 303 and a second reflecting mirror 304, the diffusion component 302 is disposed between the first reflecting mirror 303 and the second reflecting mirror 304, and the first reflecting mirror 303 and the second reflecting mirror 304 form a reflective optical path to focus the laser beam transmitted through the diffusion component 302 on the entrance of the optical wand 40 after being reflected twice.
Further, at least one of the first reflecting mirror 303 and the second reflecting mirror 304 is a curved mirror or at least one of them is a flat mirror.
The further technical scheme is that the diffusion component 302 is at least one square diffusion sheet, and the driving component is a vibration controller 301 which drives the diffusion component 302 to perform periodic motion according to a preset track.
Further, the diffusion member 302 is at least one vertically arranged square diffusion sheet, the first reflecting mirror 303 is used for reflecting the laser beam transmitted through the square diffusion sheet and passing through the square diffusion sheet again, and the second reflecting mirror 304 is used for reflecting the laser beam passing through the square diffusion sheet twice and passing through the square diffusion sheet again and focusing on the entrance of the light bar 40.
Further, according to a technical scheme, the first reflecting mirror 303 and the second reflecting mirror 304 are both curved mirrors.
The further technical scheme is that the first reflector 303 is a plane mirror, and a first condensing lens 305 for collecting light is arranged in a light path in front of the square diffusion sheet; the second mirror 304 is a curved mirror. The lens can not only play a role of turning the light path, but also replace the lens to achieve the purpose of light collection and condensation.
Further technical solution is that the first reflecting mirror 303 and the second reflecting mirror 304 are plane mirrors, and a first condensing lens 305 for collecting light is arranged in a light path in front of the square diffusion sheet; a second condenser lens 306 for collecting light is disposed in the light path behind the square diffuser, and the second condenser lens 306 is disposed between the square diffuser and the light bar 40.
Further, the diffusion member 302 is at least one vertically disposed square diffusion sheet, the first reflecting mirror 303 is used for reflecting the laser beam transmitted through the square diffusion sheet and passing through the square diffusion sheet again, and the second reflecting mirror 304 is used for reflecting the laser beam passing through the square diffusion sheet twice and focusing the laser beam directly at the entrance of the light bar 40.
Further, the diffusion member 302 is at least one obliquely arranged square diffusion sheet, and the first reflecting mirror 303 and the second reflecting mirror 304 are both curved mirrors; the first reflecting mirror 303 serves to reflect the laser beam transmitted through the square diffusion sheet and pass through the square diffusion sheet again, and the second reflecting mirror 304 serves to reflect and directly focus the laser beam passing through the square diffusion sheet twice at the entrance of the light bar 40.
The further technical scheme is that the incident angle of the square diffusion sheet and the incident laser beam is between 0 and 75 degrees.
Further, the diffusion member 302 may vibrate in any direction of three coordinate axes, i.e., x, y, and z, or in only one direction of the x, y, and z axes, or in any plane of the xy, yz, and xz planes.
Further technical proposal is that the diffusion component 302 is a circular diffusion sheet, and the driving component is a motor 307; the circular diffusion sheet is coaxially connected with a motor 307, and the motor 307 drives the circular diffusion sheet to rotate around a shaft at a high speed.
Further, the first reflecting mirror 303 is used to reflect the laser beam transmitted through the circular diffusion sheet and pass through the circular diffusion sheet again, and the second reflecting mirror 304 is used to reflect the laser beam passing through the circular diffusion sheet twice and pass through the circular diffusion sheet again and focus the laser beam at the entrance of the light bar 40.
Further, according to a technical scheme, the first reflecting mirror 303 and the second reflecting mirror 304 are both curved mirrors.
Further, the first mirror 303 and the second mirror 304 are respectively disposed on both sides of the rotation axis of the motor 307.
Further, the first mirror 303 and the second mirror 304 are respectively disposed on the same side of the rotation shaft of the motor 307.
A further technical solution is that the reflective optical path component includes an ellipsoidal mirror 308 and a first focusing lens, the diffusing component 302 is disposed between the ellipsoidal mirror 308 and the first focusing lens, and the first focusing lens and the ellipsoidal mirror 308 form a reflective optical path to reflect the laser beam transmitted through the diffusing component 302 and focus the reflected laser beam on the inlet of the optical wand 40.
The further technical scheme is that the diffusion component 302 is a square diffusion sheet, the driving component is a vibration controller 301, and the diffusion component 302 is driven to perform periodic motion according to a preset track; the first focusing lens focuses the laser beam at the first focal point 309 of the ellipsoidal mirror 308, and the laser beam passing through the square-shaped diffusion sheet is focused at the second focal point 310 of the ellipsoidal mirror 308 by reflection of the ellipsoidal mirror 308, then passes through the diffusing member 302 and is focused at the entrance of the light rod 40.
Further technical proposal is that the diffusion component 302 is a circular diffusion sheet, and the driving component is a motor 307; the circular diffusion sheet is coaxially connected with a motor 307, and the motor 307 drives the circular diffusion sheet to rotate around a shaft at a high speed; the first focusing lens focuses the laser beam at the first focal point 309 of the ellipsoidal mirror 308, and the laser beam passing through the square-shaped diffusion sheet is focused at the second focal point 310 of the ellipsoidal mirror 308 by reflection of the ellipsoidal mirror 308, then passes through the diffusing member 302 and is focused at the entrance of the light rod 40.
The further technical scheme is that the diffusion part 302 is placed in parallel with the end face of the ellipsoidal mirror 308, and the diffusion part 302 is located within ± 5mm of the first focal point 309 and the second focal point 310 of the ellipsoidal mirror 308.
A further technical scheme is that an included angle between the optical axis of the first condenser lens 305 and the normal of the surface of the diffusion part 302 is α, an included angle between the optical axis after being reflected by the ellipsoidal mirror 308 and the normal of the surface of the diffusion part 302 is β, and α and β are within the range of 0 ° to 75 °.
The further technical scheme is that the angles of alpha and beta are equal.
The further technical scheme is that the optical rod 40 is located at the focal position of the emergent light, and the inlet end of the optical rod 40 is perpendicular to the optical axis of the light beam incident on the optical rod 40.
Further technical solution is that the diffusion member 302 is a glass or quartz diffusion sheet, and has a single-sided or double-sided diffuse diffusion surface.
Further, the surfaces of first reflector 303 and second reflector 304 are plated with dielectric reflective films or metal reflective films.
The further technical scheme is that the first focusing lens and the second focusing lens are a single lens or a lens group.
Meanwhile, the invention also provides a three-color laser projection system which comprises the speckle-dispersing optical path, a green laser array 102, a red laser array 101, a blue laser array 103, a light combining assembly 104, a telescopic assembly 20 and an optical rod 40; the green, red and blue laser arrays emit green, red and blue laser beams, the light combination is completed through the light combination component 104, the aperture of the light beam is compressed through the telescopic component 20 and then enters the speckle eliminating light path 30, and the laser beams are reflected and diffused for multiple times in the speckle eliminating light path 30 and then are focused on the entrance of the light bar 40. By the dodging of the light bar 40 and the shaping of the shaping lens group 50, the light beam irradiates the surface of the display chip 70, and after being reflected by a micro mirror on the surface of the chip, the laser beam is imaged through the lens 80.
Example 1:
as shown in fig. 1, the present embodiment provides an evanescent spot light path including: the dynamic speckle eliminating device comprises a vibration controller 301 and a diffusion component 302, and comprises a reflective optical path component and a dynamic speckle eliminating device, wherein the reflective optical path component comprises a first reflecting mirror 303, a second reflecting mirror 304 and an optical rod 40; the diffusion member 302 is placed in the middle of the first mirror 303 and the second mirror 304; the vibration controller 301 vibrates the diffusion member 302.
Preferably, in this embodiment, the first reflecting mirror 303 and the second reflecting mirror 304 are preferably curved reflecting mirrors, and may be configured as a spherical surface, a hyperboloid, a paraboloid, an ellipsoid, or a free-form surface according to the technical requirement.
As shown in fig. 6, the diffusion member 302 in this embodiment is a square diffusion sheet, and may be used in a single sheet or a combination of a plurality of sheets; the diffusion angles of the diffusion sheet can be set to be uniformly distributed, and also can be set to be non-uniformly distributed according to different areas of incident light; the diffusion member 302 may vibrate in any direction of the three coordinate axes x, y, and z, in any direction of the x axis, y axis, and z axis, or in any plane of the xy plane, yz plane, and xz plane.
Preferably, the diffusing member 302 vibrates in the xy plane in this embodiment, and as shown in fig. 7, the diffusing member 302 can vibrate in the xy plane according to the trajectories a, b, c, d, e, and f, although only a part of the vibration trajectories are listed here, and in practical applications, the motion trajectories in the xy plane have other forms, which are not listed here.
The working process of the speckle elimination optical path 30 in the embodiment is as follows: the laser beam is perpendicularly incident on the diffusion member 302; the diffusion part 302 is driven by the vibrator to vibrate according to a preset track, the laser beam penetrates through the diffusion part 302 and then irradiates the first reflecting mirror 303, and the first reflecting mirror 303 is a curved reflecting mirror, so that the diffused laser beam can be reflected, and meanwhile, the light receiving effect is achieved; the laser beam is reflected and then passes through the diffusion member 302 a second time to be irradiated onto the second reflecting mirror 304, and since the second reflecting mirror 304 is also a curved surface reflecting mirror, the laser beam passes through the diffusion member 302 a third time after being reflected and is focused on the entrance of the light rod 40.
Further, the laser speckle-eliminating optical path 30 provided by this embodiment can obtain the following equivalent optical paths by simple transformation:
as shown in fig. 2, the diffusion member 302 is a diffusion sheet with a reduced size, the laser beam is directly focused on the entrance of the light bar 40 after being reflected by the second reflecting mirror 304, and is not diffused by the diffusion member 302 any more, the laser beam only passes through the diffusion member 302 twice, the speckle-eliminating effect is reduced, but the laser beam can be compensated by increasing the diffusion angle of the diffusion member 302, and the better speckle-eliminating effect can be achieved.
As shown in fig. 3, the first reflecting mirror 303 is a plane reflecting mirror, and since the plane reflecting mirror cannot receive light, a first condensing lens 305 is disposed in front of the diffusion member 302 for receiving light;
as shown in fig. 4, the first mirror 303 and the second mirror 304 are both plane mirrors, and a first condenser lens 305 is placed before the diffusion member 302; a second condenser lens 306 is placed after the diffusion member 302 for focusing the laser beam at the entrance position of the light stick 40.
As shown in fig. 5, the diffusing member 302 is disposed obliquely with respect to the incident laser beam at an angle of between 0 ° and 75 °, and the laser beam transmits through the diffusing member 302 twice, which also has a better speckle-dispersing effect.
Example 2:
as shown in fig. 8, in the present embodiment, there is provided an evanescent spot light path including: a diffusion member 302, a motor 307, a first mirror 303, a second mirror 304, a light rod 40;
as shown in fig. 10, the diffusion member 302 is a circular sheet type diffusion sheet, and has a single-sided or double-sided frosted surface.
The optical path structure and the optical principle of this embodiment are basically the same as those of embodiment 2, and the difference is that the dynamic speckle elimination device in this embodiment adopts the following technical scheme: the motor 307 is coaxially connected to the diffusing member 302, the motor 307 is disposed on the right side of the diffusing member 302, and the first mirror 303 and the second mirror 304 are disposed on the same side of the rotational axis of the motor 307. The motor 307 drives the diffusion component 302 to rotate around the shaft at a high speed, so as to achieve a better speckle-dissipating effect.
Fig. 9 shows another technical solution of this embodiment: the motor 307 is coaxially connected to the diffusing member 302, the motor 307 is disposed on the left side of the diffusing member 302, and the first mirror 303 and the second mirror 304 are disposed on both sides of the rotational axis of the motor 307, respectively. The motor 307 drives the diffusion component 302 to rotate around the shaft at high speed; the optical path structure and the optical principle of this embodiment are substantially the same as those in fig. 8, except that the laser beam is irradiated onto the diffusion member 302 from the lower region of the rotation axis, and then transmitted and reflected by the first reflecting mirror 303 to be irradiated onto the upper region of the axis of the diffusion member 302, so that the diameter of the diffusion member 302 can be reduced.
Example 3:
as shown in fig. 11, in the present embodiment, there is provided a laser speckle reduction optical path 30, including: a first condenser lens 305, a vibration controller 301, a diffusion member 302, an ellipsoidal mirror 308, and a light rod 40.
Specifically, the diffusing member 302 is placed parallel to the aperture end face of the ellipsoidal mirror 308, and the diffusing member 302 is within ± 5mm of the ellipsoidal first focal point 309 and second focal point 310.
The working process of the laser speckle-eliminating optical path 30 in the embodiment is as follows: the laser beam is incident on the first condenser lens 305, then the laser beam is focused on the first focal point 309 of the ellipsoidal mirror 308, the ellipsoidal mirror 308 reflects and focuses the laser beam on the second focal point 310, the light bar 40 is placed in front of the focal point, and the laser beam is incident on the light bar 40 for dodging.
Preferably, the diffusing member 302 is located on the face of a first focal point 309 and a second focal point 310.
Specifically, the laser beam may be incident perpendicularly to the diffusion member 302 or may be obliquely incident on the diffusion member 302; in the present embodiment, the oblique incidence method is adopted, and as shown in fig. 12, an angle between the optical axis of the first condenser lens 305 and the normal line of the surface of the diffusing member 302 is α, and an angle between the optical axis after reflection by the first reflecting mirror 303 and the normal line of the surface of the diffusing member 302 is β.
Preferably, in order to make the AOI at the first focal point 309 and the second focal point 310 coincide, the angle α and the angle β may be made equal, with α, β varying in the range of 0 ° -75 °.
Example 4:
as shown in fig. 13, in the present embodiment, a speckle eliminating optical path and a three-color laser projection system are provided, a red laser array 101, a green laser array 102, and a blue laser array 103 respectively emit three-color laser beams of red, green, and blue, which are combined into a white laser beam by a light combining assembly 104, the white laser beam penetrates through a telescopic assembly 20, the beam aperture is reduced by compression, and then enters a speckle eliminating optical path 30, in the three-color laser speckle eliminating optical path 30, the laser beam is reflected and scattered for multiple times, and then is focused at the entrance of an optical rod 40, and is irradiated onto the surface of a display chip 70 after passing through the dodging of the optical rod 40, the beam shaping of the shaping lens group 50, and the TIR prism 60, and the laser beam is reflected by the micro mirror 80 of the display chip 70.
The above description is a specific implementation of the speckle-elimination optical path and the three-color laser projection system of the present invention, and the speckle elimination described in this patent does not completely eliminate laser speckles, but reduces the contrast of the laser speckles to a specific range that can meet the application requirements of the product.
Although the invention has been described herein with reference to illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure herein. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (3)

1. An speckle-evanescents optical path, comprising: comprises a reflection light path component, a dynamic speckle eliminating device and an optical rod (40); the dynamic despeckle device comprises a diffusion component (302) and a driving component connected with the diffusion component (302); the reflecting light path component focuses the laser beam which passes through the diffusion component (302) on the inlet of the light rod (40) after at least one reflection;
the reflection light path component comprises a first reflecting mirror (303) and a second reflecting mirror (304), a diffusion part (302) is arranged between the first reflecting mirror (303) and the second reflecting mirror (304), and the first reflecting mirror (303) and the second reflecting mirror (304) form a reflection light path to focus the laser beam transmitted through the diffusion part (302) on the inlet of the light rod (40) after being reflected twice;
at least one of the first reflecting mirror (303) and the second reflecting mirror (304) is a curved mirror or at least one of the first reflecting mirror and the second reflecting mirror is a plane mirror;
the diffusion member (302) is a circular diffusion sheet, and the driving member is a motor (307); the circular diffusion sheet is coaxially connected with a motor (307), and the motor (307) drives the circular diffusion sheet to rotate around a shaft at a high speed;
a first reflecting mirror (303) for reflecting the laser beam transmitted through the circular diffusion sheet and passing through the circular diffusion sheet again, and a second reflecting mirror (304) for reflecting the laser beam passing through the circular diffusion sheet twice and passing through the circular diffusion sheet again and focusing on an entrance of the light bar (40);
the first mirror (303) and the second mirror (304) are disposed on both sides of the rotation axis of the motor (307), respectively.
2. The speckle-evanescents optical path of claim 1, wherein: the diffusion member (302) is a glass or quartz diffusion sheet, and has a single-sided or double-sided diffuse diffusion surface.
3. The speckle-evanescents optical path of claim 1, wherein: the surfaces of the first reflector (303) and the second reflector (304) are plated with dielectric reflecting films or metal reflecting films.
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CN112764297B (en) * 2020-12-30 2022-04-22 深圳市火乐科技发展有限公司 Dynamic diffusion sheet assembly, control method, laser speckle-dispersing device and projector
CN116482923A (en) 2022-01-13 2023-07-25 台达电子工业股份有限公司 Light source module
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