CN211878401U

CN211878401U - Laser projection device

Info

Publication number: CN211878401U
Application number: CN202020594184.XU
Authority: CN
Inventors: 张重扬; 曹秀燕
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-11-06
Anticipated expiration: 2030-04-20

Abstract

The application discloses laser projection equipment belongs to projection technical field. The method comprises the following steps: the light source is used for emitting light beams; the optical machine comprises a digital micromirror device DMD, a fixed support, a vibrating mirror and an optical machine shell; the DMD is used for modulating and reflecting light beams emitted by a light source to output, the reflected light beams can penetrate through the first light hole and the vibrating mirror and enter the lens, and the vibrating mirror can be switched between deflection and reset positions at a first frequency; the camera lens is used for right the light beam of shaking mirror transmission when different positions is imaged, and assurance fixed bolster among the above-mentioned technical scheme can be more steadily will shake the mirror and fix on the ray apparatus casing, and the vibration range of fixed bolster when having reduced the mirror vibration that shakes has reduced the noise that produces because of the collision between fixed bolster and the ray apparatus casing.

Description

Laser projection device

Technical Field

The application relates to the technical field of projection, in particular to laser projection equipment.

Background

With the continuous development of science and technology, laser projection equipment is more and more applied to the work and the life of people, and is mainly used for emitting light beams to realize transmission imaging on a projection screen.

In the related art, as shown in fig. 1, a laser projection apparatus mainly includes a light source, an optical engine and a lens, where the optical engine includes a DMD (Digital Micromirror Device), a cantilever 1, a galvanometer 2 and an optical engine housing 3. Wherein, the light source is fixed on the light inlet side of the optical machine shell 3 and is used for emitting light beams; the stiff end and the ray apparatus casing 3 fixed connection of DMD and cantilever 1, the mirror 2 fixed connection that shakes is at the cantilever end of cantilever 1. The DMD is used for reflecting light beams emitted by the light source to the vibrating mirror 2, the vibrating mirror 2 can be switched between deflection and reset at a certain frequency so as to deflect partial light beams reflected by the DMD, and the lens is fixed on the light outlet side of the optical machine shell 3 and used for transmitting and imaging the light beams deflected by the vibrating mirror 2 and the light beams not deflected.

However, the galvanometer 2 inevitably vibrates in the deflection process, and since the fixing mode between the galvanometer 2 and the optical machine housing 3 is equivalent to cantilever fixing, the galvanometer 2 has a large vibration amplitude in the vibration process, and then the cantilever support 1 is easily driven to resonate. Therefore, the vibrating mirror 2 and the cantilever support 1 and the optical machine shell 3 are collided to generate noise, and the use of the laser projection equipment is further influenced.

Disclosure of Invention

The application provides a laser projection device, which can solve the problem that the laser projection device is easy to generate noise. The technical scheme is as follows:

a laser projection device, the laser projection device comprising:

a light source for emitting a light beam;

the optical machine comprises a digital micromirror device DMD, a fixed support, a vibrating mirror and an optical machine shell;

the DMD is used for modulating and reflecting light beams emitted by a light source to output, the reflected light beams can penetrate through the first light hole and the vibrating mirror and enter the lens, and the vibrating mirror can be switched between deflection and reset positions at a first frequency;

and the lens is used for imaging the light beams transmitted by the galvanometer at different positions.

The technical scheme provided by the application has the beneficial effects that at least:

mirror fixed connection shakes is on the fixed bolster, and the fixed bolster carries out fixed connection with the at least three inner walls of ray apparatus casing, can guarantee that the fixed bolster can be more steadily will shake the mirror and fix on the ray apparatus casing to the in-process that the mirror that shakes deflects is difficult for driving the fixed bolster and takes place to resonate, thereby is difficult for producing the noise between fixed bolster and the ray apparatus casing, has avoided the influence of too big noise to laser projection equipment performance. Because be provided with first light trap on the fixed bolster, the light beam of reflection through DMD modulation can pass first light trap and shake the mirror, and the lens that shakes the mirror can switch between deflection and reset position, and the light beam after the deflection and the light beam outgoing that does not deflect are to the camera lens, and the camera lens is carried out the formation of image with the superimposed light beam of dislocation, can improve the definition of projection picture.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an exploded view of a light engine provided in the related art;

FIG. 2 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present application;

fig. 3 is an exploded view of an optical machine according to an embodiment of the present disclosure;

fig. 4 is a schematic cross-sectional view of an optical-mechanical device according to an embodiment of the present disclosure;

FIG. 5 is a schematic projection diagram of a 2k projection provided in an embodiment of the present application;

FIG. 6 is a schematic projection diagram of another 2k projection provided in the embodiments of the present application;

FIG. 7 is a schematic projection diagram of a 4k projection provided by an embodiment of the present application;

fig. 8 is a schematic structural diagram of a galvanometer according to an embodiment of the present disclosure.

Fig. 9 is a schematic cross-sectional structure diagram of a galvanometer according to an embodiment of the present disclosure.

Reference numerals:

the related technology comprises the following steps:

1: a cantilever support; 2: a galvanometer; 3: the ray apparatus casing.

The embodiment of the application:

00: a light source; 01: an optical machine; 02: a lens; 03: a heat sink;

1: DMD; 2: fixing a bracket; 3: a galvanometer; 4: a light machine shell; 5: a first fixing member; 6: a shading sheet; 7: an optical lens;

31: a control component; 32: a light transmissive component; 51: a first vibration damping rubber; 71: a lens assembly; 72: a mirror; 73: a prism assembly;

311: a PCB; 321: a deflection spring; 322: a light-transmitting mirror; 323: a first set screw;

3211: an inner ring of the spring plate; 3212: an outer ring of the spring plate; 3213: a first connecting bridge; 3214: a second connecting bridge; 3215: a third connecting bridge; 3216: a fourth connecting bridge; 3217: a first fixed arm; 3218: a second fixed arm.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 2 illustrates a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application, and fig. 3 illustrates a schematic cross-sectional structural diagram of an optical machine according to an embodiment of the present application. As shown in fig. 2 and 3, the laser projection apparatus includes: the device comprises a light source 00, an optical machine 01 and a lens 02, wherein the light source 00 is used for emitting light beams; the optical machine 01 comprises a DMD1, a fixed bracket 2, a galvanometer 3 and an optical machine shell 4; the DMD1 is disposed inside the optical engine housing 4, the fixed bracket 2 is fixedly connected to at least three inner walls of the optical engine housing 4, for example, specifically, the fixed bracket 2 is fixedly connected to the optical engine housing 4 through at least three first fixing members 5, the fixed bracket 2 is provided with a first light-transmitting hole, the galvanometer 3 is fixedly connected to the fixed bracket 2 through at least three second fixing members, and a coverage area of an orthographic projection of the galvanometer 3 on the fixed bracket 2 and an area where the first light-transmitting hole is located have an overlapping portion; the DMD1 is used for reflecting the light beam emitted by the light source 00 to the vibrating mirror 3, and the vibrating mirror 3 can be switched between deflection and reset at a first frequency so as to deflect the light beam reflected by the DMD1 during deflection; the lens 02 is fixed on the light outlet side of the optical machine shell 4, and the lens 02 is used for transmitting and imaging the light beam deflected by the galvanometer 3 and the light beam not deflected.

In the embodiment of the application, because at least three first mounting 5 and at least three second mounting homoenergetic are enclosed into the polygon, thereby guarantee that fixed bolster 2 can fix mirror 3 that shakes on ray apparatus casing 4 more steadily, thereby the in-process that 3 deflections of mirror that shakes is difficult for driving fixed bolster 2 and takes place resonance, thereby be difficult for producing the noise between fixed bolster 2 and the ray apparatus casing 4, avoided the influence of too big noise to laser projection equipment performance. Because the fixed support 2 is provided with the first light hole, and the coverage area of the orthographic projection of the galvanometer 3 on the fixed support 2 and the area where the first light hole is located have the overlapping part, the light beam can pass through the galvanometer 3 and the first light hole to realize the propagation. The galvanometer 3 can deflect the light beam reflected by the rotation of the DMD1 during deflection, and can emit the deflected light beam and the undeflected light beam to the lens 02, so that the lens 02 can realize transmission imaging.

It should be noted that, in the embodiment of the present application, the optical engine 01 may not include the fixing bracket 2, so that the galvanometer 3 is directly fixedly connected with the optical engine housing 4. The galvanometer 3 may be fixedly connected to the optical machine housing 4 through at least three third fixing members, and the at least three third fixing members enclose a polygon. Since the fixed bracket 2 for supporting the galvanometer 3 is eliminated, the generation of noise due to collision between the galvanometer 3 and the fixed bracket 2 is avoided, thereby further reducing the loudness of the noise. Meanwhile, the number of components in the optical machine housing 4 is reduced, and the occupancy rate of the internal space of the optical machine housing 4 is further reduced, so that other devices can be conveniently arranged in the optical machine 01. Wherein, can set up the damping packing ring that corresponds with every third mounting between mirror 3 and the ray apparatus casing 4 shakes, every damping packing ring can overlap on the third mounting that corresponds, and presss from both sides tightly between mirror 3 and ray apparatus casing 4 shakes. Thus, collision between the galvanometer 3 and the optical machine housing 4 can be effectively prevented.

Wherein the first frequency is the inverse of the time length from the undeflected state to the deflected state of the galvanometer 3. The duration can be set according to the reaction duration of human eyes, and the picture projected by the lens 02 can embody the effect of 4K resolution when a user watches the picture, which is not limited in the embodiment of the application.

The light source 00 may be fixed on the light inlet side of the optical machine housing 4, and the shell wall where the light inlet side of the optical machine housing 4 is located may be adjacent to the shell wall where the light outlet side is located, or may be opposite to the light inlet side. The relative position of the galvanometer 3 and the fixed support 2 can be set according to the size of the light outlet side space of the optical machine shell 4, for example, when the space of the light outlet side of the optical machine shell 4 is large, if the volume of the fixed support 2 is larger than that of the galvanometer 3, the fixed support 2 can be closer to the lens 02 relative to the galvanometer 3. Of course, the relative positions of the galvanometer 3 and the fixed bracket 2 may be set according to other conditions, which is not limited in the embodiment of the present application.

The fixing bracket 2 may have a rectangular structure, or may have a structure having other shapes such as a circular shape. When the fixed bolster 2 is the rectangle structure, and the quantity of first mounting 5 is three, three first mounting 5 can be close to three sides of rectangle fixed bolster 2 respectively, and like this, the distribution position of three first mounting 5 is more dispersed, therefore can carry out spacing on a large scale to fixed bolster 2. When the number of the first fixing members 5 is four, the four first fixing members 5 may be respectively close to four side edges of the rectangular fixing bracket 2, and may be provided in other forms, which is not limited in the embodiment of the present application. In addition, the first fixing member 5 may be a fixing screw, but may be other types of first fixing members 5.

It should be noted that the structure of each second fixing element and the structure of the first fixing element 5 may be the same or similar, and are not described in detail in this embodiment of the application.

In some embodiments, the optical engine 01 may further include at least three first vibration damping rubbers 51 corresponding to the at least three first fixing pieces 5 one to one, and each first fixing piece 5 passes through the corresponding first vibration damping rubber 51 and the fixing bracket and is fixedly connected with the optical engine housing. In this way, the first vibration damping rubber 51 can avoid the collision of the corresponding first fixing member 5 with the fixing bracket 2, thereby significantly reducing the volume of noise.

Wherein, first mounting 5 can be the shaft shoulder screw, and correspondingly, first damping rubber 51 can overlap in the shaft shoulder department of shaft shoulder screw, and first damping rubber 51 can be greater than the length of shaft shoulder along the length of the central axis direction of shaft shoulder screw, and then first damping rubber 51 can avoid the direct contact of fixed bolster 2 with the shaft shoulder, and then avoids the collision each other of first mounting 5 and fixed bolster 2. Of course, the first fixing member 5 may also be other types of screws, which is not described in detail in this embodiment of the application.

In some embodiments, the laser projection device may be an ultra-short-focus laser projection device, and of course, the laser projection device may also be a short-focus laser projection device or a long-focus laser projection device. The laser projection apparatus may further include a heat sink 03, referring to fig. 2, in addition to the light source 00, the optical machine 01 and the lens 02, the heat sink 03 may be fixedly connected to the optical machine 01 to dissipate heat of the optical machine 01, the heat sink 03 may also be connected to the light source 00 to dissipate heat of the light source 00, of course, the heat sink 03 may be simultaneously connected to the light source 00 and the optical machine 01 to dissipate heat of the light source 00 and the optical machine 01 simultaneously, which is not limited in this embodiment of the application.

In some embodiments, light source 00 may comprise a monochromatic light source 00, and may also comprise a polychromatic light source 00. When the light source 00 includes the monochromatic light source 00, the monochromatic light source 00 may be a blue laser, and at this time, the light source 00 may further include a fluorescent wheel and a color filter wheel, so as to ensure that the light beam emitted by the light source 00 may be a red, green and blue light beam. Of course, the light source 00 may not include a fluorescent wheel and/or a color filter wheel, so that in order to ensure the projection effect of the laser projection device, the fluorescent wheel and/or the color filter wheel may be disposed in the optical engine 01, that is, the optical engine 01 may further include the fluorescent wheel and/or the color filter wheel.

When the light source 00 includes the multicolor light source 00, the multicolor light source 00 may be a three-color laser system. As an example, a three-color laser system may include a green laser, a red laser, and a blue laser, so that three red, green, and blue light beams may be emitted directly through the three lasers.

It should be noted that, when the light beam is emitted from the light source 00, in order to ensure uniformity of the emitted light beam, the optical engine 01 may further include a light uniformizing assembly, so as to perform light uniformizing processing on the light beam emitted from the monochromatic light source 00 or the multicolor light source 00 included in the light source 00 through the light uniformizing assembly. Wherein the light homogenizing assembly is described in detail below.

In some embodiments, as shown in fig. 2 and 4, the optical engine 01 may further include an optical lens 7, the optical lens 7 may include a lens assembly 71, a reflector 72 and a prism assembly 73, a light incident side of the lens assembly 71 faces a light incident side of the optical engine housing 4, and a light emergent side of the lens assembly 71 faces a reflecting surface of the reflector 72, so that the lens assembly 71 may shape the light beam emitted from the light source 00 and emit the shaped light beam to the reflector 72; the reflecting surface of the mirror 72 is also directed to the first light incident side of the prism assembly 73, so that the mirror 72 can reflect the light beam shaped by the lens assembly 71 to the prism assembly 73; the first light-exiting side and the second light-entering side of the prism assembly 73 face the DMD1, and the second light-exiting side of the prism assembly 73 faces the galvanometer 3, so that the prism assembly 73 can refract the light beam reflected by the reflector 72 to the DMD1, and totally reflect the light beam after rotating reflection to the galvanometer 3 after the DMD1 rotates and reflects the light beam.

The lens assembly 71 may include a convex lens and/or a concave lens, and the prism assembly 73 may be a TIR (Total internal Reflection) prism or an RTIR (Total refractive internal Reflection) prism. In order to ensure the display effect of the image, the distance from the light-emitting surface of the galvanometer 3 to the first lens included in the lens 02 is greater than 1mm, and the distance from the light-entering surface of the galvanometer 3 to the surface where the second light-emitting side of the prism assembly 73 is located is greater than 1 mm.

Next, the structure of the galvanometer will be explained.

In the embodiment of the application, when the galvanometer 3 is switched between deflection and reset at the first frequency, the projected picture formed by the light beam emitted by the DMD1 can realize 4k resolution, so that the projection effect of the laser projection device is improved.

When the galvanometer 3 is not deflected, that is, after the galvanometer 3 is reset, the light beam reflected by the rotation of the DMD1 can directly pass through the galvanometer 3, and the pixel point arrangement of the realized picture can be as shown in fig. 5, and the picture has 2K resolution. When the galvanometer 3 is in a deflection state, after the light beam reflected by the DMD1 in a rotating manner is deflected by the galvanometer 3, the arrangement of the pixel points of the picture can be as shown in fig. 6, and the picture has a resolution of 2K. Thus, because the polarization frequency of the vibrating mirror 3 is high, the change states of the projected picture after the vibrating mirror 3 deflects and the projected picture after the vibrating mirror 3 resets are not easily distinguished by human eyes, and the pictures after the vibrating mirror 3 resets and the vibrating mirror 3 deflects can show a superimposed effect. In this way, the arrangement of the pixel points of the picture presented on the image can be as shown in fig. 7, thereby achieving 4K resolution of the picture.

In some embodiments, the galvanometer 3 may be a plate-shaped structure, as shown in fig. 8 and 9, the galvanometer 3 includes a control component 31 and a light-transmitting component 32, the control component 31 is fixedly connected with the fixing support 2, and the light-transmitting component 32 is fixed on the control component 31 and is arranged with a gap from the control component 31; the light transmissive element 32 is switchable between deflection and reset at a first frequency under the influence of the control element 31. In this way, the galvanometer 3 may be fixedly connected to the fixed bracket 2 through the control component 31, and may be deflected and reset through the light transmission component 32, and the light transmission component 32 may deflect the light beam reflected by the DMD1 when deflected. In addition, because the galvanometer 3 can be of a plate-shaped structure, the galvanometer 3 is small in size, and further is not easy to generate obvious vibration and obvious noise during deflection.

It should be noted that the control unit 31 and the light transmission unit 32 are both plate-shaped structures, and thus, the galvanometer 3 formed by the control unit 31 and the light transmission unit 32 arranged at a gap may also be a plate-shaped structure.

The gap between the transparent component 32 and the control component 31 may be not less than 0.5mm, so as to ensure that the transparent component 32 is not affected by the control component 31 when deflecting. The gap may be, for example, 0.6mm or 0.8mm apart. Of course, the gap between the light transmission component 32 and the control component 31 may also be another value, as long as it is ensured that the light transmission component 32 is not affected when deflecting, and the galvanometer 3 may maintain a plate-like structure, which does not cause the overall size of the galvanometer 3 to be too large, and this embodiment of the present application does not limit this.

Light transmission component

In some embodiments, as shown in fig. 8 and 9, the light transmissive component 32 may include a deflection dome 321 and a light transmissive mirror 322; the deflection elastic sheet 321 is fixed on the control assembly 31, the deflection elastic sheet 321 is provided with a second light hole, the light-transmitting mirror 322 is fixedly connected with the deflection elastic sheet 321, a coverage area of the orthographic projection of the light-transmitting mirror 322 on the deflection elastic sheet 321 and an area where the second light hole is located have an overlapping portion, and the control assembly 31 is used for controlling the light-transmitting mirror 322 to switch between deflection and reset at a first frequency through the deflection elastic sheet 321. Like this, because the shell fragment 321 that deflects has elasticity, therefore produce elastic deformation easily under the control of control assembly 31, and then be convenient for produce by the control of control assembly 31 and deflect, drive printing opacity mirror 322 simultaneously and deflect, likewise, can be convenient for produce by the control of control assembly 31 and reset, and then drive printing opacity mirror 322 and reset.

The transparent mirror 322 may be embedded in the deflection elastic sheet 321 based on the second transparent hole, so that the hole wall of the second transparent hole may be in close contact with the outer edge of the transparent mirror 322, and therefore, the coverage area of the orthographic projection of the transparent mirror 322 on the deflection elastic sheet 321 and the area where the second transparent hole is located may have an overlapping portion. In addition, the transparent mirror 322 may also be bonded to the deflection elastic sheet 321 by an adhesive, and the transparent mirror 322 covers the second transparent hole, so that the coverage area of the orthographic projection of the transparent mirror 322 on the deflection elastic sheet 321 may overlap the area where the second transparent hole is located. Of course, the transparent mirror 322 may also be fixedly connected to the deflecting elastic piece 321 in other ways, which is not limited in this embodiment. Since the coverage area of the orthographic projection of the light-transmitting mirror 322 on the deflecting elastic piece 321 and the area where the second light-transmitting hole is located have an overlapping portion, the light beam rotationally reflected by the DMD1 can smoothly pass through the light-transmitting component 32 based on the overlapping portion.

The area of the second light hole may be smaller than the area of the light transmissive mirror 322, and certainly, the area of the second light hole may also be larger than the area of the light transmissive mirror 322 as long as the light beam is not blocked from propagating, which is not limited in the embodiment of the present application.

The transparent mirror 322 may be circular or square, and accordingly, the second transparent hole may have the same shape as the transparent mirror 322. Of course, the light-transmitting mirror 322 and the second light-transmitting hole may be configured in other shapes, which is not limited in this embodiment.

It should be noted that the control assembly 31 may control the deflection elastic sheet 321 to deflect and reset based on the principle of magnetic field attraction or repulsion, and accordingly, the material of the deflection elastic sheet 321 may be a metal material that is easily magnetized, and for example, the material of the deflection elastic sheet 321 may be iron, cobalt, nickel, and the like. In this way, the control assembly 31 may attract or repel the deflection springs 321 to effect deflection and repositioning of the deflection springs 321. Of course, the control assembly 31 may also control the deflection elastic sheet 321 to deflect and reset based on other principles, and the deflection elastic sheet 321 may also be made of other materials, which is not limited in this embodiment of the application.

Deflection spring plate

In some embodiments, as shown in fig. 8, the deflection shrapnel 321 may include a shrapnel inner ring 3211 and a shrapnel outer ring 3212; a second light hole is formed in the inner edge of the spring plate inner ring 3211, the light-transmitting mirror 322 is fixedly connected with the inner edge of the spring plate inner ring 3211, the outer edge of the spring plate inner ring 3211 is provided with a first connecting bridge 3213 and a second connecting bridge 3214 which are arranged in an opposite manner, the spring plate inner ring 3211 is fixedly connected with the inner edge of the spring plate outer ring 3212 through the first connecting bridge 3213 and the second connecting bridge 3214, and the control assembly 31 can control the spring plate inner ring 3211 to deflect by taking a first straight line where the first connecting bridge 3213 and the second connecting bridge 3214 are located as a rotating shaft; the outer edge of the spring plate outer ring 3212 has a third connecting bridge 3215 and a fourth connecting bridge 3216 which are arranged opposite to each other, and a first fixing arm 3217 extending along the third connecting bridge 3215 and a second fixing arm 3218 extending along the fourth connecting bridge 3216, the spring plate outer ring 3212 is fixedly connected with the control component 31 through the first fixing arm 3217 and the second fixing arm 3218, the control component 31 can control the second straight line of the spring plate outer ring 3212 at which the third connecting bridge 3215 and the fourth connecting bridge 3216 are located to deflect as a rotating shaft, wherein the first straight line and the second straight line are not parallel.

Thus, when the spring inner ring 3211 deflects with the first straight line where the first connecting bridge 3213 and the second connecting bridge 3214 are located as the rotation axis, the light-transmitting mirror 322 can be driven to synchronously deflect with the first straight line as the rotation axis; when the spring outer ring 3212 deflects with the second straight line on which the third connecting bridge 3215 and the fourth connecting bridge 3216 are located as the rotation axis, the lens 322 can be driven to deflect with the second straight line as the rotation axis. Further, since the first straight line and the second straight line are not parallel, the transparent mirror 322 can deflect around two non-parallel rotation axes, so that the image can be deflected in the two-dimensional coordinate system, that is, the pixels of the image are deflected in the two-dimensional coordinate system.

It should be noted that the inner spring ring 3211, the outer spring ring 3212, the first connecting bridge 3213, the second connecting bridge 3214, the third connecting bridge 3215, the fourth connecting bridge 3216, the first fixing arm 3217, and the second fixing arm 3218 may be integrally formed, so as to ensure the strength of the deflecting spring 321, and the structures are not easily broken.

Note that, since the material of the deflection spring 321 may be a metal material that is easily magnetized, such as iron, cobalt, or nickel, the material of the spring inner ring 3211 and the spring outer ring 3212 may also be a metal material that is easily magnetized, such as iron, cobalt, or nickel. In this way, the control assembly 31 can directly control the deflection of the inner spring ring 3211 and the outer spring ring 3212 based on the magnetic attraction or repulsion principle.

The spring inner ring 3211 may be rectangular or circular, the shape of the spring inner ring 3211 may be the same as that of the transparent mirror 322, further, the shape of the spring outer ring 3212 may be the same as that of the spring inner ring 3211, and of course, the spring outer ring 3212 may also be set to other different shapes, which is not limited in this embodiment of the present application. The first connecting bridge 3213, the second connecting bridge 3214, the third connecting bridge 3215 and the fourth connecting bridge 3216 may all be strip-shaped sheet-like structures with small size, so as to generate torsion under the external force, and further facilitate flexible deflection of the spring inner ring 3211 and the spring outer ring 3212. The first fixing arm 3217 and the second fixing arm 3218 may each have a rectangular sheet-like structure, but may have other sheet-like structures, which is not limited in the embodiments of the present application.

The first straight line may coincide with a central axis of the spring inner ring 3211 along the plane direction, or may have a certain distance from the central axis. The second straight line may coincide with a central axis of the clip outer ring 3212 along the planar direction, or may have a certain distance from the central axis, which is not limited in this embodiment of the application.

In some embodiments, as shown in fig. 8, the first line may be perpendicular to the second line, so that the light-transmitting mirror 322 may deflect around two perpendicular rotation axes, and the image may be shifted along a bisector of an included angle between the first line and the second line, thereby exhibiting a clearer 4k effect. Of course, the first straight line and the second straight line may have other angles, which is not limited in the embodiments of the present application.

In some embodiments, as shown in fig. 8, the outer edge of the clip inner ring 3211 has at least one first metal protrusion along a direction perpendicular to the first straight line, the outer edge of the clip outer ring 3212 has at least one second metal protrusion along a direction perpendicular to the second straight line, and the control assembly 31 can control each first metal protrusion and each second metal protrusion to approach or depart from the control assembly 31. In this way, the control assembly 31 may control the clip inner ring 3211 and the clip outer ring 3212 based on the specific positions of the first metal protrusion and the second metal protrusion, so as to ensure accurate control of deflection of the clip inner ring 3211 and the clip outer ring 3212.

The first metal protrusion and the second metal protrusion may be both rectangular sheet-like structures, and of course, may also be structures of other shapes, which is not limited in this application. The first metal protrusion may be integrally formed with the spring inner ring 3211, and the second metal protrusion may be integrally formed with the spring outer ring 3212.

Under the condition that the shape of the spring plate inner ring 3211 is rectangular, when the number of the first metal protrusions is one, the first metal protrusions may be disposed on a side of the spring plate inner ring 3211 that is not connected to the first connecting bridge 3213 and the second connecting bridge 3214, so that the control assembly 31 may make the side of the spring plate inner ring 3211 close to or far away from the control assembly 31, and the spring plate inner ring 3211 is convenient to deflect with the first straight line as the rotating axis. When the number of the first metal protrusions is two, the two first metal protrusions may be respectively disposed on two opposite side edges of the spring inner ring 3211, which are not connected to the first connecting bridge 3213 and the second connecting bridge 3214. Thus, the control component 31 can make one side edge of the spring inner ring 3211 where the first metal protrusion is located close to the control component 31 based on one of the first metal protrusions, and make one side edge of the spring inner ring 3211 where the first metal protrusion is located far from the control component 31 based on the other first metal protrusion, so that the spring inner ring 3211 can deflect by using the first straight line as the rotating shaft. Of course, the number of the first metal protrusions may also be set to be more than two, as long as the elastic piece inner ring 3211 is beneficial to deflecting by taking the first straight line as the rotation axis, which is not described again in this embodiment of the application.

The number of the second metal protrusions may be one, or two or more, and the arrangement manner of the second metal protrusions may be the same as that of the first metal protrusions, which is not described in detail in this embodiment of the application.

The material of the deflecting elastic piece 321 may be a metal material that is easily magnetized, such as iron, cobalt, or nickel, and thus the material of the first metal bump and the second metal bump may also be a metal material that is easily magnetized, such as iron, cobalt, or nickel. Like this, the magnetization area of shell fragment inner circle 3211 can be increased to the first metal arch, and the magnetization area of shell fragment outer circle 3212 can be increased to the second metal arch, and then be convenient for the control assembly to shell fragment inner circle 3211 and shell fragment outer circle 3212's control. Of course, the spring inner ring 3211 may not include the first metal protrusion, and the spring outer ring 3212 may not include the second metal protrusion, as long as the control assembly can control the deflection and the reset of the light-transmitting mirror based on the spring inner ring 3211 and the spring outer ring 3212, which is not limited in this embodiment of the application.

In some embodiments, as shown in fig. 8, the galvanometer 3 may further include a plurality of first fixing screws 323, and the first fixing arm 3217 and the second fixing arm 3218 may be fixedly connected to the control assembly 31 by the plurality of first fixing screws 323, of course, the first fixing arm 3217 and the second fixing arm 3218 may also be welded to the control assembly 31, which is not limited in the embodiments of the present application.

When the first fixing arm 3217 and the second fixing arm 3218 are respectively fixedly connected to the control assembly 31 through the first fixing screw 323, damping rubber rings may be disposed between the first fixing arm 3217 and the corresponding first fixing screw 323, and between the second fixing arm 3218 and the corresponding first fixing screw 323, so as to reduce noise generated between the first fixing arm 3217 and the corresponding first fixing screw 323, and between the second fixing arm 3218 and the corresponding first fixing screw 323 when the spring outer ring 3212 deflects.

In some embodiments, the control assembly 31 may include a PCB (Printed Circuit Board) 311, the PCB311 having a control coil Printed thereon; the PCB311 is fixed on the fixing bracket 2 by at least three second fixing pieces; a third light-transmitting hole is formed in the PCB311, the light-transmitting component 32 is fixed on the PCB311, an overlapping portion is formed between a coverage area of an orthographic projection of the light-transmitting component 32 on the PCB311 and an area where the third light-transmitting hole is located, and the light-transmitting component 32 and the PCB311 are arranged in a gap; the PCB311 is further printed with a control circuit, the control circuit is electrically connected to the control coil, and the control circuit is configured to adjust a current direction of the control coil at a first frequency, so as to control the light-transmitting component 32 to switch between deflection and reset at the first frequency through a magnetic field generated after the control coil is powered on.

Thus, since the PCB311 is fixed on the fixing bracket 2 by at least three second fixing members, and the at least three second fixing members enclose a polygon, the PCB311 can be more stably fixed on the fixing bracket 2 based on the plane where the PCB311 is located. Since the coverage area of the orthographic projection of the light-transmitting component 32 on the PCB311 and the area where the third light-transmitting hole is located have an overlapping portion, the light beam can smoothly transmit through the light-transmitting component 32 and the PCB311 board based on the overlapping portion. In addition, since the control coil is printed on the PCB311, the overall volume of the control assembly 31 can be reduced, and a miniaturized design of the control assembly 31 can be achieved.

It should be noted that, when the light transmitting assembly 32 includes the deflecting elastic sheet 321, since the deflecting elastic sheet 321 may be made of a material that is easily magnetized, a magnetic field generated after the control coil is powered on may attract or repel the deflecting elastic sheet 321, and thus the light transmitting assembly 23 may be controlled to deflect and reset based on the deflecting elastic sheet 321.

When the light transmission component 32 includes the deflection elastic sheet 321, after the control coil is energized to generate a magnetic field, the deflection elastic sheet 321 arranged in a gap with the control coil may be magnetized, and the magnetic field direction of the magnetized deflection elastic sheet 321 is consistent with the magnetic field direction of the control coil, so that the deflection elastic sheet 321 may be attracted by the control coil, and then the deflection elastic sheet 321 is close to the control coil to realize deflection, thereby realizing deflection of the light transmission component 32. Further, after the current direction of the control coil is changed, since the magnetized deflection shrapnel 321 has hysteresis, the magnetic field direction of the deflection shrapnel 321 is temporarily opposite to the magnetic field direction of the control coil, and the deflection shrapnel 321 can be repelled by the control coil, so that the deflection shrapnel 321 is gradually away from the control coil. In the process that the deflection elastic sheet 321 is far away from the control coil, the deflection elastic sheet 321 passes through the position of the deflection elastic sheet 321 when the deflection elastic sheet 321 is not deflected, that is, the initial position of the deflection elastic sheet 321, so that the reset of the deflection elastic sheet 321 can be realized. Further, the deflecting elastic sheet 321 repeats the above process to implement multiple deflecting and resetting, which is not described in this embodiment.

Of course, the control circuit may also switch the control coil between de-energized and energized at the first frequency to effect switching of the light transmissive component between deflection and reset at the first frequency. In implementation, after the control coil is powered on to generate a magnetic field, the deflection elastic sheet 321 arranged in a gap with the control coil can be magnetized, and the direction of the magnetic field of the magnetized deflection elastic sheet 321 is consistent with that of the control coil, so that the deflection elastic sheet 321 can be attracted by the control coil, and the deflection elastic sheet 321 is close to the control coil to realize deflection. When the control coil is powered off, the attraction of the control coil to the deflection elastic sheet 321 included in the light transmission component 32 disappears, and the light transmission component 32 is reset. Further, the control circuit can energize and de-energize the control coil at a first frequency, which in turn can switch the optically transparent member 32 between deflecting and resetting at the first frequency.

The control coil may be a solenoid, and a central axis direction of the solenoid may be perpendicular to a planar direction of the light-transmitting component 32, so that a magnetic field generated after the solenoid is energized may be perpendicular to the planar direction of the light-transmitting component 32, thereby achieving attraction and repulsion to the light-transmitting component 32. Of course, the control coil may also be another type of coil as long as the control coil can attract or repel the light-transmitting component 32 after being powered on, and this embodiment of the present application is not described again.

The shape of the third light hole may be rectangular or circular, the shape and size of the third light hole may be consistent with those of the first light hole, a connecting line between the center point of the third light hole and the center point of the first light hole may be perpendicular to the plane direction of the light-transmitting assembly 32, and when hot, the third light hole may be set in other forms as long as the propagation of the light beam is not disturbed, which is not limited in the embodiments of the present application.

It should be noted that the control coil can be located near the edge of the light transmissive element 32, so that the control coil can easily deflect the light transmissive element 32 when attracting or repelling the light transmissive element 32.

In some embodiments, the control coil may include at least one first sub-control coil and at least one second sub-control coil, each first sub-control coil and each second sub-control coil being electrically connected to the control circuit, the control circuit for adjusting a current direction of each first sub-control coil and each second sub-control coil at a first frequency; when the deflection elastic piece 321 includes an elastic piece inner ring 3211 and an elastic piece outer ring 3212, the magnetic field generated by the at least one first sub-control coil after being energized controls the elastic piece inner ring 3211 to deflect with the first straight line as the rotation axis, and the magnetic field generated by the at least one second sub-control coil after being energized controls the elastic piece outer ring 3212 to deflect with the second straight line as the rotation axis.

Therefore, at least one first sub-control coil can realize deflection of the inner ring 3211 of the spring plate, at least one second sub-control coil can realize deflection of the outer ring 3212 of the spring plate, and then the first sub-control coil and the second sub-control coil are matched to realize deflection of the light-transmitting mirror 322 around the first straight line and the second straight line respectively as rotating shafts.

In some embodiments, when the spring inner ring 3211 is provided with first metal protrusions and the spring outer ring 3212 is provided with second metal protrusions, the number of the first sub-control coils and the number of the first metal protrusions may be the same and are in one-to-one correspondence, and each first sub-control coil may be disposed at a position right below the corresponding first metal protrusion; the number of the second sub-control coils and the number of the second metal protrusions may be the same and the second sub-control coils may correspond to each other one by one, and each of the second sub-control coils may be disposed at a position right below the corresponding second metal protrusion.

Since the first metal protrusion and the second metal protrusion can be made of materials which are easily magnetized, the first metal protrusion and the second metal protrusion can respectively increase the magnetized areas of the inner ring 3211 and the outer ring 3212 of the spring plate, thereby facilitating the attraction and repulsion of the first sub-control coil to the inner ring 3211 of the spring plate based on the first metal protrusion and the attraction and repulsion of the second sub-control coil to the outer ring 3212 of the spring plate based on the second metal protrusion.

In some embodiments, the galvanometer 3 may further include at least three second vibration damping rubbers corresponding to the at least three second fixing pieces one to one, and each second fixing piece penetrates through the corresponding second vibration damping rubber and the PCB311 board and is fixedly connected to the fixing bracket 2. Thus, the second vibration damping rubber can avoid the mutual collision of the corresponding second fixing piece and the PCB311, and further the noise volume is obviously reduced.

Wherein, the second mounting can be the shaft shoulder screw, and correspondingly, second damping rubber can overlap in the shaft shoulder department of shaft shoulder screw, and second damping rubber can be greater than the length of shaft shoulder along the length of the central axis direction of shaft shoulder screw, and then second damping rubber can avoid the direct contact of PCB311 board with the shaft shoulder, and then avoids the collision each other of second mounting and PCB311 board. Of course, the second fixing member may also be other types of screws, which is not described in this embodiment.

In some embodiments, as shown in fig. 3 and 4, the optical engine 01 may further include a light shielding sheet 6, the light shielding sheet 6 is fixedly connected to the optical engine housing 4 and located between the DMD1 and the galvanometer mirror 3, and the light shielding sheet 6 is configured to absorb heat in the optical engine housing 4 and receive a part of the light beam after being rotatably reflected by the DMD1, so as to conduct the heat in the optical engine housing 4 and the heat generated by the part of the light beam to the optical engine housing 4. Therefore, partial light beams can be prevented from being directly irradiated to the control component 31 and the light-transmitting component 32 which are included in the galvanometer 3, excessive heat is prevented from being accumulated on the control component 31 to enable the temperature of the control coil which is included in the control component 31 to rise, the consequences of deformation and the like caused by the temperature rise of the light-transmitting component 32 can also be prevented, the failure of the galvanometer 3 can be avoided, and the reliability of the galvanometer 3 is improved. Simultaneously, the light shield 6 can also conduct the heat of 4 inner spaces of ray apparatus casing to ray apparatus casing 4, and then ray apparatus casing 4 gives off the heat to ray apparatus casing 4 outsidely to can realize the high-efficient heat dissipation in the ray apparatus casing 4.

The partial light beam may be a light beam that is not directly emitted to the lens 02 after being rotationally reflected by the DMD 1. Since part of the light beam is not directly used for projection, it can be directly received by the light shielding sheet 6 without affecting the projection of the laser projection apparatus.

The material of the light shielding sheet 6 can be copper, aluminum and other materials with excellent heat conductivity, so as to realize high-efficiency heat absorption and heat conduction. In addition, the surfaces of the light shielding sheet 6 and the optical machine housing 4 can be coated with light absorbing materials, so that the heat absorption effect of the light shielding sheet 6 and the optical machine housing 4 can be enhanced.

In some embodiments, when the optical engine 01 includes a light homogenizing assembly, the light homogenizing assembly may be a light guide pipe or the like, the light guide pipe may be disposed on a bottom surface inside the optical engine housing 4, one end of the light guide pipe faces a light inlet side of the optical engine housing 4, the other end of the light guide pipe faces a light inlet side of the lens assembly 71, and a center line of the light guide pipe coincides with a main optical axis of the lens assembly 71. The light guide is used for homogenizing the light beam emitted from the light source 00 and emitting the homogenized light beam to the lens assembly 71.

It should be noted that, when the light guide is fixed on the bottom surface of the optical engine housing 4, in order to prevent the components included in the optical engine 01 from generating assembly deviation, so that the light spot formed by the light beam cannot cover the working area of the DMD1, the light guide may be adjustably fixed on the bottom surface of the optical engine housing 4. The fixing manner of the light guide tube may refer to the prior art, which is not limited in the embodiments of the present application.

It should be noted that the size of the rectangular light guide may be in a preset ratio to the size of the DMD1, so as to ensure that the light beam shaped by the lens assembly 71 can just cover the working area of the DMD1, thereby ensuring the imaging effect of the laser projection apparatus, and avoiding the temperature increase of the non-working area of the DMD1 caused by the light beam hitting the non-working area of the DMD 1.

In some embodiments, when the optical lens 7 includes a TIR prism, the optical housing 4 may be provided with two limiting elastic pieces and a limiting boss, the limiting boss is used for supporting and limiting the TIR prism based on the bottom surface of the TIR prism, and the two limiting elastic pieces respectively abut against two side walls of the TIR prism that are not used for propagating the light beam. Therefore, the TIR prism can be applied to 3 bearing surface directions by the two limiting elastic sheets and the limiting boss to bear the bearing force, so that the position accuracy of the TIR prism is ensured, and the projection effect of the laser projection equipment is improved.

In the embodiment of the application, because at least three first mounting and at least three second mounting homoenergetic are enclosed into the polygon, thereby guarantee that the fixed bolster can fix the mirror that shakes on the ray apparatus casing more steadily, thereby the in-process that the mirror that shakes deflects is difficult for driving the fixed bolster and takes place resonance, thereby be difficult for producing the noise between fixed bolster and the ray apparatus casing, avoided the influence of too big noise to laser projection equipment performance. Because the fixed support is provided with the first light-transmitting hole, and the coverage area of the orthographic projection of the galvanometer on the fixed support and the area where the first light-transmitting hole is located have the overlapping part, the light beam can pass through the galvanometer and the first light-transmitting hole to realize propagation. The galvanometer can deflect the light beam reflected by the rotary DMD in deflection, and can emit the deflected light beam and the undeflected light beam to the lens, so that the lens can realize transmission imaging. The deflection of the light-transmitting mirror to different directions can be realized by the elastic piece inner ring and the elastic piece outer ring, the first sub control coil can realize the independent control of the elastic piece inner ring, and the second sub control coil can realize the independent control of the elastic piece outer ring.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A laser projection device, characterized in that the laser projection device comprises:

a light source for emitting a light beam;

the fixed bracket is fixedly connected with at least three inner walls of the optical machine shell, the fixed bracket is provided with a first light hole, the galvanometer is fixed on the fixed bracket,

the DMD is used for modulating and reflecting the light beam emitted by the light source, outputting the light beam after reflection, the light beam can penetrate through the first light-transmitting hole and the vibrating mirror and then enter the lens, and the vibrating mirror can be switched between a deflection position and a reset position at a first frequency;

2. The laser projection device of claim 1,

the fixing support is fixedly connected with the optical machine shell through at least three first fixing pieces, and the galvanometer is fixedly connected with the fixing support through at least three second fixing pieces.

3. The laser projection device as claimed in claim 1, wherein the galvanometer is a plate-shaped structure, the galvanometer includes a control component and a light-transmitting component, the control component is fixedly connected with the fixed bracket, and the light-transmitting component is fixed on the control component and is arranged with a gap from the control component;

the light transmission component is switchable between deflected and reset positions at the first frequency under the action of the control component.

4. The laser projection device of claim 3, wherein the light transmissive component comprises a deflection spring and a light transmissive mirror;

the deflection elastic sheet is fixed on the control assembly, a second light hole is formed in the deflection elastic sheet, the light-transmitting mirror is fixedly connected with the deflection elastic sheet, an area covered by the orthographic projection of the light-transmitting mirror on the deflection elastic sheet and an area where the second light hole is located are overlapped, and the control assembly is used for controlling the light-transmitting mirror to be switched between deflection and reset through the deflection elastic sheet according to the first frequency.

5. The laser projection device of claim 4, wherein the deflection spring comprises a spring inner ring and a spring outer ring;

the inner edge of the elastic piece inner ring forms the second light hole, the light-transmitting mirror is fixedly connected with the elastic piece inner ring, the outer edge of the elastic piece inner ring is provided with a first connecting bridge and a second connecting bridge which are arranged in an opposite mode, the elastic piece inner ring is fixedly connected with the inner edge of the elastic piece outer ring through the first connecting bridge and the second connecting bridge, and the control assembly can control the elastic piece inner ring to deflect by taking a first straight line where the first connecting bridge and the second connecting bridge are located as a rotating shaft;

the outer fringe of shell fragment outer lane has the third that sets up mutually and connects bridge and fourth connection bridge, and follows the first fixed arm that the bridge extended is connected to the third with follow the second fixed arm that the bridge extended is connected to the fourth, the shell fragment outer lane passes through first fixed arm with the second fixed arm with control assembly fixed connection, control assembly can control the shell fragment outer lane with the third connect the bridge with the second straight line at fourth connection bridge place is the rotation axis deflection, wherein first straight line with second straight line nonparallel.

6. The laser projection device as claimed in claim 5, wherein the outer edge of the inner ring of the spring plate has at least one first metal protrusion along a direction perpendicular to the first line, the outer edge of the outer ring of the spring plate has at least one second metal protrusion along a direction perpendicular to the second line, the control component can control each first metal protrusion and each second metal protrusion to approach or depart from the control component, and the first line is perpendicular to the second line.

7. The laser projection device as claimed in claim 5, wherein the galvanometer further comprises a plurality of first set screws, and the first and second fixed arms are fixedly coupled to the control assembly via the plurality of first set screws.

8. The laser projection device of any of claims 3-7, wherein the control assembly includes a Printed Circuit Board (PCB) having a control coil printed thereon;

the PCB is fixed on the fixed bracket through at least three second fixing pieces;

a third light transmission hole is formed in the PCB, the light transmission assembly is fixed on the PCB, an overlapping part is formed in the area where the orthographic projection of the light transmission assembly on the PCB is covered and the third light transmission hole is located, and the light transmission assembly and the PCB are arranged in a gap mode;

the PCB is further printed with a control circuit, the control circuit is electrically connected with the control coil, and the control circuit is used for adjusting the current direction of the control coil at the first frequency so as to control the light-transmitting component to be switched between deflection and reset at the first frequency through a magnetic field generated after the control coil is electrified.

9. The laser projection device of claim 8, wherein the control coil comprises at least one first sub-control coil and at least one second sub-control coil, each first sub-control coil and each second sub-control coil being electrically connected to the control circuit, the control circuit being configured to adjust a current direction of each first sub-control coil and each second sub-control coil at the first frequency.

10. The laser projection device as claimed in claim 1, wherein the optical-mechanical housing further comprises at least three first damping rubbers corresponding to the at least three first fixing members one to one, and each first fixing member penetrates through the corresponding first damping rubber and the fixing bracket and is fixedly connected to the optical-mechanical housing.

11. The laser projection device as claimed in claim 8, wherein the galvanometer further includes at least three second damping rubbers corresponding to the at least three second fixing members one to one, and each second fixing member penetrates the corresponding second damping rubber and the PCB and is fixedly connected to the fixing bracket.

12. The laser projection apparatus of claim 1, wherein the optical engine further includes a light shielding sheet fixedly connected to the optical engine housing and located between the DMD and the galvanometer, the light shielding sheet being configured to absorb heat in the optical engine housing and receive a portion of the light beam after the DMD rotates and reflects, so as to conduct the heat in the optical engine housing and the heat generated by the portion of the light beam to the optical engine housing.