WO2023115893A1 - Optical engine and laser projection equipment - Google Patents

Abstract

An optical engine (10) and laser projection equipment. The optical engine (10) comprises a light source assembly (100), an illumination assembly (13), a light valve (14), and an adjustment assembly (11). The light source assembly (100) is configured to provide an illumination light beam; the illumination assembly (13) is configured to receive the illumination light beam and perform optical path adjustment; the light valve (14) is configured to receive the illumination light beam adjusted by the illumination assembly (13) and modulate same to obtain an image light beam; the adjustment assembly (11) is configured to adjust the numerical aperture angle of the light beam directed to the light valve (14); the illumination assembly (13) comprises a first lens group (131), a second lens group (132) and a third lens group (133) arranged in sequence in the optical path direction; the second lens group (132) is mounted in the adjustment assembly (11); the adjustment assembly (11) is used for driving the second lens group (132) to move between the first lens group (131) and the third lens group (133) in a direction parallel to the optical axis (C2) of the second lens group (132).

Description

Optical Engine and Laser Projection Equipment

This application claims priority to a Chinese patent application with application number 202111590047.4 filed on December 23, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present disclosure relates to laser projection technology, in particular, to an optical engine and laser projection equipment.

Background technique

At present, laser projection technology is a new type of projection technology on the market. Laser projection technology has the characteristics of high picture contrast, clear imaging, bright colors and high brightness. These characteristics make laser projection technology become the mainstream development direction in the market.

Contents of the invention

In a first aspect, some embodiments of the present disclosure provide an optical engine, and the optical engine includes: a light source assembly, an illumination assembly, a light valve, and an adjustment assembly. The light source assembly is configured to provide an illumination beam. The lighting assembly is configured to receive the lighting beam and adjust the light path. The light valve is configured to receive the adjusted illumination light beam of the illumination assembly, and modulate it to obtain an image light beam. The adjusting component is configured to adjust the numerical aperture angle of the light beam irradiated to the light valve. The lighting assembly includes a first mirror group, a second mirror group and a third mirror group sequentially arranged along the light path direction. The second lens group is installed in the adjustment assembly, and the adjustment assembly is used to drive the second lens group to move between the first lens group and the second lens group in a direction parallel to the optical axis of the second lens group. Move between the third lens group.

In a second aspect, some embodiments of the present disclosure provide a projection device, where the projection device includes the optical engine described in the foregoing embodiments.

Description of drawings

FIG. 1 is a structural diagram of a laser projection device shown in some embodiments of the present disclosure;

Fig. 2 is a schematic diagram of a light source assembly, an optical engine and a lens in a laser projection device according to some embodiments of the present disclosure;

Fig. 3 is an optical path architecture diagram in a laser projection device shown in some embodiments of the present disclosure;

Fig. 4 is a schematic diagram of the optical path principle of the light source assembly in the laser projection device shown in some embodiments of the present disclosure;

Fig. 5 is an arrangement structure diagram of tiny mirror mirrors in a digital micromirror device shown in some embodiments of the present disclosure;

Fig. 6 is a working schematic diagram of a tiny reflective mirror shown in some embodiments of the present disclosure;

Fig. 7 is the schematic diagram of the position of the swing of a tiny mirror in the digital micromirror device shown in Fig. 5;

Fig. 8 is a schematic structural diagram of an optical engine shown in some embodiments of the present disclosure;

FIG. 9 is a structural schematic view of the optical engine shown in FIG. 8 looking toward the optical engine along a first direction;

Fig. 10 is a schematic diagram of light beams received by the light incident surface of a light valve according to some embodiments of the present disclosure;

Fig. 11 is a schematic structural diagram of another optical engine shown in some embodiments of the present disclosure;

Fig. 12 is a schematic diagram of another position of the first mirror group and the second mirror group in the optical engine shown in Fig. 11;

Fig. 13 is a schematic structural diagram of an adjustment assembly shown in some embodiments of the present disclosure;

Fig. 14 is a schematic structural view of the inner lens barrel in the adjustment assembly shown in Fig. 13;

Fig. 15 is a schematic structural view of the outer lens barrel in the adjustment assembly shown in Fig. 13;

Fig. 16 is a schematic diagram of the connection structure of the first connection shaft and the second mirror group shown in some embodiments of the present disclosure;

Fig. 17 is a schematic structural diagram of another optical engine provided by some embodiments of the present disclosure;

Fig. 18 is a schematic diagram of another state of the homogenization component in the optical engine shown in Fig. 17;

FIG. 19 is a schematic diagram of a partial structure of the optical engine shown in FIG. 8 .

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments provided in the present disclosure belong to the protection scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the term "comprise" and other forms such as the third person singular "comprises" and the present participle "comprising" are used Interpreted as the meaning of openness and inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples" example)" or "some examples (some examples)" etc. are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or examples are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used when describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited by the context herein.

As used herein, the term "if" is optionally interpreted to mean "when" or "at" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that ..." or "if [the stated condition or event] is detected" are optionally construed to mean "when determining ..." or "in response to determining ..." depending on the context Or "upon detection of [stated condition or event]" or "in response to detection of [stated condition or event]".

The use of "suitable for" or "configured to" herein means open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

Additionally, the use of "based on" is meant to be open and inclusive, as a process, step, calculation, or other action that is "based on" one or more conditions or values may in practice be based on additional conditions or beyond values.

As used herein, "about" or "approximately" includes the stated value as well as averages within acceptable deviations from the specified value, as considered by one of ordinary skill in the art considering the measurement in question. As well as errors associated with the measurement of a particular quantity (ie, limitations of the measurement system) are determined.

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Accordingly, variations in shape from the drawings as a result, for example, of manufacturing techniques and/or tolerances are contemplated. Thus, example embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will, typically, have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

Fig. 1 is a structural diagram of a laser projection device shown in some embodiments of the present disclosure. As shown in FIG. 1 , the laser projection device includes a complete casing 101 (only part of the casing is shown in the figure), an optical engine 10 and a projection screen (not shown in the figure). The optical engine 10 includes a light source assembly 100 , an optical-mechanical assembly 200 , and a lens 300 assembled in the machine housing 101 . The light source assembly 100 is configured to provide an illumination beam (laser beam). The optomechanical assembly 200 is configured to use an image signal to modulate the illumination beam provided by the light source assembly 100 to obtain a projection beam. The lens 300 is configured to project the projection beam onto a projection screen or a wall for imaging. The light source assembly 100 , the optomechanical assembly 200 and the lens 300 are sequentially connected along the beam propagation direction, and each is wrapped by a corresponding housing. The housings of the light source assembly 100 , the optomechanical assembly 200 and the lens 300 support the optical components and make the optical components meet certain sealing or airtight requirements. For example, the light source assembly 100 is airtightly sealed through its corresponding housing, which can better improve the problem of light decay of the light source assembly 100 .

One end of the optical mechanical assembly 200 is connected to the lens 300 and arranged along a first direction X of the whole machine, for example, the first direction X may be the width direction of the whole machine. The light source assembly 100 is connected to the other end of the optical mechanical assembly 200 . In this example, the connecting direction of the light source assembly 100 and the optical mechanical assembly 200 is perpendicular to the connecting direction of the optical mechanical assembly 200 and the lens 300. On the one hand, this connection structure can adapt to the optical path characteristics of the reflective light valve in the optical mechanical assembly 200, On the other hand, it is also beneficial to shorten the length of the optical path in one dimension, which is beneficial to the structural arrangement of the whole machine. For example, when the light source assembly 100, the optical mechanical assembly 200, and the lens 300 are arranged in a dimensional direction (for example, the second direction Y, the second direction Y being perpendicular to the first direction X), the length of the optical path in this direction will be very large. Long, which is not conducive to the structural arrangement of the whole machine.

In some embodiments, light source assembly 100 may include three laser arrays. Fig. 2 is a schematic diagram of a light source assembly, an optical engine and a lens in a laser projection device according to some embodiments of the present disclosure. As shown in FIG. 2 , taking the light source assembly 100 as an example of a three-color laser light source, the three laser arrays are a red laser array 130 , a green laser array 120 and a blue laser array 110 , but it is not limited thereto. The three laser arrays may also all be blue laser arrays 110 , or two laser arrays may be blue laser arrays 110 , and one laser array may be red laser arrays 130 . When the multiple lasers included in the light source assembly 100 can generate three primary colors, the light source assembly 100 can generate an illumination beam containing light of the three primary colors, so there is no need to set a fluorescent wheel in the light source assembly 100 (when one or more lasers included in the light source assembly When the array can only generate one or two colors of laser light, it is necessary to use the existing color laser to excite the fluorescent wheel to generate other colors of fluorescent light, so that the laser light and the fluorescent light together form white light), thereby simplifying the structure of the light source assembly 100, The volume of the light source assembly 100 is reduced.

In some embodiments, the light source assembly 100 may also include two laser arrays. Taking the light source assembly 100 as an example of a two-color laser light source, the two laser arrays may be a blue laser array 110 and a red laser array 130 .

In some other embodiments, the light source assembly 100 may also include a laser array, that is, the light source assembly 100 is a monochromatic laser light source. For example, the light source assembly 100 includes only the blue laser array 110 , or only the red laser array 130 .

Fig. 4 is a schematic diagram of the principle of an optical path of a light source assembly in a laser projection device according to some embodiments of the present disclosure. As shown in FIG. 4 , the laser array is a blue laser array 110 . The light source assembly 100 may further include: a fluorescent wheel 140 and a color filter wheel 150 . After the blue laser 110 emits blue light, a part of the blue light is irradiated on the fluorescent wheel 140 to generate red fluorescent light (when the light source assembly 100 includes the red laser array 130, it is not necessary to generate red fluorescent light) and green fluorescent light; , red fluorescent light (or red laser) and green fluorescent light sequentially pass through the light combining mirror 160 and then pass through the color filter wheel 150 for color filtering, and output the three primary colors sequentially. According to the phenomenon of persistence of vision of the human eye, the human eye cannot distinguish the color of light at a certain moment, and what it perceives is still mixed white light.

Fig. 3 is a structural diagram of an optical path in a laser projection device according to some embodiments of the present disclosure. As shown in FIG. 2 and FIG. 3 , the illuminating light beam emitted by the light source assembly 100 enters the optomechanical assembly 200 . The optical mechanical assembly 200 may include: a light guide 210 , a lens assembly 220 , a mirror 230 , a digital micromirror device (Digital Micromirror Device, DMD) 240 and a prism assembly 250 . The light pipe 210 can receive the illumination beam provided by the light source assembly 100 and homogenize the illumination beam. The lens assembly 220 can amplify the illumination light beam first, then converge it and output it to the reflector 230 . The mirror 230 can reflect the illumination beam to the prism assembly 250 . The prism assembly 250 reflects the illumination beam to the DMD 240 , and the DMD 240 modulates the illumination beam and reflects the modulated projection beam to the lens 300 .

In the optomechanical assembly 200, the DMD240 is the core component, and its function is to use the image signal to modulate the illumination beam provided by the light source assembly 100, that is, to control the illumination beam to display different colors and brightness for different pixels of the image to be displayed, so as to finally Form an optical image, so DMD240 is also called a light modulation device or light valve. According to whether the light modulation device (or light valve) transmits or reflects the illumination beam, the light modulation device (or light valve) can be divided into a transmissive light modulation device (or light valve) or a reflective light modulation device (or light valve). ). For example, as shown in FIG. 2 and FIG. 3 , the DMD240 reflects the illumination beam, which is a reflective light modulation device. The liquid crystal light valve transmits the illumination beam, so it is a transmissive light modulation device. In addition, according to the number of light modulation devices (or light valves) used in the optomechanics, the optomechanics can be divided into single-chip systems, two-chip systems or three-chip systems. For example, only one piece of DMD 240 is used in the optomechanical assembly 200 shown in FIG. 2 and FIG. 3 , so the optomechanical assembly 200 can be called a single-chip system. When three digital micromirror devices are used, the optomechanical assembly 200 can be called a three-chip system.

The DMD240 is applied in a digital light processing (Digital Light Processing, DLP) projection architecture. As shown in FIG. 2 and FIG. 3 , the optical-mechanical component 200 uses a DLP projection architecture. Fig. 5 is a diagram showing the arrangement and structure of micro mirrors in a digital micromirror device according to some embodiments of the present disclosure. As shown in FIG. 5 , the DMD 240 includes thousands of tiny mirrors 2401 that can be individually driven to rotate. These tiny mirrors 2401 are arranged in an array, and each tiny mirror 2401 corresponds to a pixel in the image to be displayed. In the DLP projection architecture, each tiny reflector 2401 is equivalent to a digital switch, which can swing within the range of plus or minus 12 degrees (±12°) or plus or minus 17 degrees (±17°) under the action of an external electric field, to The reflected light can be imaged on the screen through the lens 300 along the optical axis to form a bright pixel.

Fig. 6 is a working schematic diagram of a tiny reflective mirror shown in some embodiments of the present disclosure. As shown in FIG. 6 , the light reflected by the tiny mirror 2401 at a negative deflection angle is called OFF light, and the OFF light is ineffective light, which usually hits the housing of the optomechanical assembly 200 or the light absorbing unit and is absorbed. absorb it. The light reflected by the tiny reflective lens 2401 at a positive deflection angle is called ON light. The ON light is the effective light beam that the tiny reflective lens 2401 on the surface of the DMD240 receives the illumination light beam and enters the lens 300 at a positive deflection angle. for projection imaging. The open state of the micro-reflector 2401 is the state where the micro-reflector 2401 is and can be maintained when the illumination beam emitted by the light source assembly 100 is reflected by the micro-reflector 2401 and can enter the lens 300, that is, the micro-reflector 2401 is at a positive deflection angle status. The closed state of the tiny reflective mirror 2401 is the state where the tiny reflective mirror 2401 is and can be maintained when the illuminating light beam emitted by the light source assembly 100 is reflected by the tiny reflective mirror 2401 and does not enter the lens 300, that is, the tiny reflective mirror 2401 is in a negative deflection angle status.

Exemplarily, FIG. 7 is a schematic diagram of a swinging position of a tiny mirror in the digital micromirror device shown in FIG. 5 . As shown in Figure 7, for the tiny reflector 2401 with a deflection angle of ±12°, the state at +12° is the on state, the state at -12° is the off state, and for -12° and +12° The actual working state of the tiny mirror 2401 is only the on state and the off state.

Exemplarily, for the tiny reflective mirror 2401 with a deflection angle of ±17°, the state at +17° is the on state, and the state at -17° is the off state. After the image signal is processed, it is converted into digital codes such as 0 and 1, and these digital codes can drive the tiny mirror 2401 to vibrate.

During the display period of one frame of image, part or all of the tiny mirrors 2401 will be switched once between the on state and the off state, so as to realize the display in one frame of image according to the duration time of the tiny mirrors 2401 respectively in the on state and the off state. The gray scale of each pixel of . For example, when a pixel has 256 gray scales from 0 to 255, the tiny mirrors corresponding to gray scale 0 are in the off state during the entire display period of one frame of images, and the tiny mirrors corresponding to gray scale 255 are in the off state during one frame. The whole display period of the image is in the on state, and the tiny reflective mirror corresponding to the gray scale 127 is in the on state for half of the time in the display period of a frame of image, and the other half of the time is in the off state. Therefore, by controlling the state of each tiny reflective mirror in the display period of a frame image and the maintenance time of each state through the image signal, the brightness (gray scale) of the corresponding pixel of the tiny reflective mirror 2401 can be controlled, realizing the The purpose of modulating the illumination beam projected to the DMD240.

The light guide 210, lens assembly 220 and reflector 230 at the front end of the DMD240 form an illumination optical path, and the illumination beam emitted by the light source assembly 100 passes through the illumination optical path to form a beam size and incident angle that meet the requirements of the DMD240.

As shown in FIG. 2 , the lens 300 includes a combination of multiple lenses, which are generally divided into groups, such as three-stage front group, middle group and rear group, or two-stage front group and rear group. The front group is the lens group near the light-emitting side of the projection device (left side shown in FIG. 2 ), and the rear group is the lens group near the light-emitting side of the optical mechanical assembly 200 (right side shown in FIG. 2 ). According to the combination of the above-mentioned various lens groups, the lens 300 can also be a zoom lens, or a fixed focus adjustable focus lens, or a fixed focus lens.

In some embodiments, the fixed-focus lens refers to a projection lens with a fixed focal length and a fixed lens. The size of the picture projected by the fixed-focus lens under the fixed focal length cannot be changed, and is suitable for the family concept that basically does not change the use environment. film. A zoom lens refers to a projection lens that can change the focal length within a certain range, so that images of various sizes can be obtained, and it can have multiple projection distances. The projection distance can refer to the distance between the zoom lens and the projection screen used to display the picture. distance. Alternatively, the zoom lens can also change the size of the screen by changing the focal length without changing the projection distance. Therefore, the zoom lens can make the installation and use of laser projection equipment more flexible and convenient. Since the aperture value of the zoom lens is the ratio of the focal length of the projection lens to the effective aperture diameter of the projection lens, when the zoom lens is changing the focal length, the aperture value of the zoom lens will also change with the change of the focal length. Exemplary Yes, the smaller the aperture value, the larger the aperture of the zoom lens, that is, the greater the light transmittance of the zoom lens.

In some embodiments, the aperture value of the optomechanical assembly is fixed, so that the aperture value of the optical mechanical assembly cannot match the variable aperture value of the zoom lens. For example, when the aperture value of the zoom lens of the laser projection device is adjusted to not match the aperture value of the optical-mechanical assembly, if the aperture of the optical-mechanical assembly is too large (the aperture value is too small), the aperture of the zoom lens is too small (the aperture The value is too large), which will cause the light beam emitted by the optical-mechanical assembly to fail to fully enter the zoom lens, resulting in a low light energy utilization rate of the projection device, and a poor display effect of the projection device; or, if the aperture of the optical-mechanical assembly is too small ( The aperture value is too large), and the aperture of the zoom lens is too large (the aperture value is too small), which will cause the light beam emitted by the optical-mechanical component to fail to meet the brightness required by the zoom lens, which will lead to low brightness of the projection device and the display of the projection device The effect is poor.

Some embodiments of the present disclosure provide an optical engine and a laser projection device, which can solve the problems existing in the above related technologies.

Fig. 8 is a schematic structural view of an optical engine shown in some embodiments of the present disclosure, and Fig. 9 is a structural schematic view of the optical engine shown in Fig. 8 looking toward the optical engine along a first direction. The first direction f1 may be perpendicular to the plane where the light incident surface of the light valve is located. The optical engine 10 may include: a light source assembly 100 and an optical-mechanical assembly (regulating assembly 11, and an illumination assembly 13 and a light valve 14 sequentially arranged along the light path direction). It should be noted that, in order to clearly show the positional relationship of each lens group in FIG. 8 , the adjustment assembly 11 is not shown in FIG. 8 , and a schematic diagram of the adjustment assembly 11 is shown in FIG. 9 .

The light source assembly 100 is used to emit light beams and direct them to the lighting assembly 13. The lighting assembly 13 adjusts the received light beams and irradiates the adjusted light beams to the light valve 14. The light valve 14 is used as a light modulation element to receive the adjusted light beams. The image beam is reflected, and the image beam exits the optical engine through the lighting assembly 13 .

In some embodiments, the lighting assembly 13 may include a first mirror group 131 , a second mirror group 132 and a third mirror group 133 sequentially arranged along the light path direction. The first lens group 131 can be used for collimating and expanding the light beam emitted by the light source assembly 100 , reducing the spot size, and guiding the beam to the second lens group 132 . The second lens group 132 can be used to shape the received light beam, so that the received light beam can be guided to the third lens group 133 after the received light beam satisfies a preset aperture value. The third mirror group 133 can be used to converge the light beam adjusted and emitted by the second mirror group 132 to shorten the optical path and reduce the size of the spot again.

The second mirror group 132 can be installed in the adjustment assembly 11, and the adjustment assembly 11 can be used to drive the second mirror group 132 to move between the first mirror group 131 and the third mirror group along the direction parallel to the optical axis C2 of the second mirror group 132. 133 to move between.

The light valve 14 includes a light incident surface, which can be used to receive the light beam provided by the lighting assembly 13. The aperture value F of the optical engine 10 and the numerical aperture angle θ of the light beam received by the light incident surface can satisfy the following formula (1):

F＝1/2sinθ (1)

Fig. 10 is a schematic diagram of a light beam received by a light incident surface of a light valve according to some embodiments of the present disclosure. As shown in Figure 10, g1 is the focal point of the light beam, and the numerical aperture angle θ refers to the divergence angle of the light beam received by the light incident surface of the light valve 14, and the divergence angle can refer to the distance between the edge s1 of the light beam and the center line s2 of the light beam The included angle, the centerline s2 of the light beam can refer to the line connecting the center point g2 of the diameter of the light beam received by the incident light surface and the focal point g1.

Therefore, by adjusting the position of the second mirror group 132, that is, making the second mirror group 132 move between the first mirror group 131 and the third mirror group 133 along a direction parallel to the optical axis C2 of the second mirror group 132, it is possible to By adjusting the numerical aperture angle θ of the light beam received by the light incident surface of the light valve 14 , the aperture value of the optical engine 10 can be adjusted.

In addition, the optical-mechanical assembly can emit light beams to the projection lens, and the projection lens can include a zoom lens, and the aperture value of the optical-mechanical assembly can be adjusted to be the same or similar to that of the projection lens, so as to prevent the light beams of the optical-mechanical assembly from being unable to fully enter the projection lens. The lens can further improve the utilization rate of light energy of the optical engine. Alternatively, the aperture value of the opto-mechanical assembly can be adjusted to be the same or similar to that of the projection lens, so as to avoid that the aperture of the opto-mechanical assembly is smaller than the projection lens, and the brightness of the emitted light beam cannot meet the brightness requirement of the projection lens. , so that the brightness of the projection device where the optical engine is located can be improved.

Fig. 11 is a schematic structural diagram of another optical engine shown in some embodiments of the present disclosure. In some embodiments, as shown in FIG. 11 , the first mirror group 131 can also be installed in the adjustment assembly 11 . The adjustment assembly 11 can be used to drive the first mirror group 131 to move in the direction opposite to the moving direction of the second mirror group 132 when driving the second mirror group 132 to move. The first lens group 131 can comprise at least one lens, and this at least one lens can comprise spherical lens, and/or, aspherical lens; The second lens group 132 can comprise at least one lens, and this at least one lens can comprise spherical lens, and/or Or, an aspheric lens; the third lens group 133 may include at least one lens, and the at least one lens may include a spherical lens, and/or, an aspheric lens.

The first mirror group 131 can move along the direction parallel to the optical axis of the second mirror group 132 along with the movement of the second mirror group 132, and the moving direction is opposite to the moving direction of the second mirror group 132, so that the first mirror The group 131 can be used for compensating the optical power of the second lens group 132, so as to avoid the change of the position of the second lens group 132 resulting in the change of the imaging quality of the optical engine. Optical power is a numerical value used to characterize the refractive power of an optical system for incident parallel light beams. The larger the value of the focal power of the second lens group, the greater the degree of refraction of the light beam passing through the second lens group 132 by the second lens group 132 .

In some embodiments, the optical engine 10 can also include a housing (not shown in the figure), the adjustment assembly 11 can be fixedly installed in the housing, the third mirror group 133 can be fixedly installed in the housing, and the light valve 14 It can also be fixedly installed in the housing. In this way, the distance between the third mirror group 133 and the light valve 14 is a fixed distance, and the position of the second mirror group 132 relative to the third mirror group 133 moves, which can be equivalent to the distance between the second mirror group 132 and the light valve 14. The location has changed. As shown in Figure 11, the length of the distance L1 between the second mirror group 132 and the third mirror group 133 is inversely proportional to the angle of the numerical aperture angle θ of the light beam received by the light incident surface of the light valve 14, and is inversely proportional to the angle of the optical engine 10 proportional to the aperture value. Exemplarily, the smaller the length of the distance L1 between the second mirror group 132 and the third mirror group 133, the larger the numerical aperture angle θ of the light beam received by the light incident surface of the light valve 14, and the smaller the aperture value F , the larger the aperture of the optical engine 10 is.

FIG. 12 is a schematic diagram of another position of the first mirror group and the second mirror group in the optical engine shown in FIG. 11 . As shown in Figure 12, relative to the position of the second mirror group 132 in Figure 11, the length of the distance L2 between the second mirror group 132 and the third mirror group 133 in Figure 12 is relatively small, so that The numerical aperture angle θ of the light beam received by the light incident surface of the light valve 14 in FIG. 12 is larger, the aperture value F of the optical engine 10 is smaller, and the aperture of the optical engine 10 is larger. At the same time, the first mirror group 131 moves in the opposite direction to the moving direction of the second mirror group 132, and the distance between the first mirror group 131 and the third mirror group 133 in FIG. The distance between the lens groups 133 can compensate the optical power of the second lens group 132 after displacement.

In some embodiments, FIG. 13 is a schematic structural diagram of an adjustment assembly shown in some embodiments of the present disclosure. As shown in FIG. 13 , the adjustment assembly 11 may include an outer lens barrel 111 , an inner lens barrel 112 and at least one first connecting shaft 113 .

FIG. 14 is a schematic structural view of the inner lens barrel in the adjustment assembly shown in FIG. 13 . As shown in Figure 14, the side wall of the inner lens barrel 112 can have at least one first strip-shaped through hole 1121, the length direction of the first strip-shaped through hole 1121 can be parallel to the axial direction f2 of the inner lens barrel 112, the inner lens barrel The axial direction f2 of 112 may be parallel to the axis C3 of the inner lens barrel 112 . The inner lens barrel 112 can be used as a supporting part of the adjustment assembly 11 , and the inner lens barrel 112 can be fixedly or flexibly connected with the casing of the optical engine 10 so that the inner lens barrel 112 does not rotate relative to the casing. The inner lens barrel 112 can be a hollow cylindrical structure, the second lens group 132 can be located inside the inner lens barrel 112, and there is a gap between the edge of the second lens group 132 and the inner side wall of the inner lens barrel 112, so that The second lens group 132 can move along the axial direction f2 of the inner lens barrel 112 , and the axial direction f2 of the inner lens barrel 112 is parallel to the optical axis of the second lens group 132 .

FIG. 15 is a schematic structural view of the outer lens barrel in the adjustment assembly shown in FIG. 13 , as shown in FIG. 15 . The outer lens barrel 111 can be sleeved on the inner lens barrel 112, and the side wall of the outer lens barrel 111 can have at least one first arc-shaped through hole 1111, and the first arc-shaped through hole 1111 is in a spiral shape. That is, the first arc-shaped through hole 1111 can be a curved arc-shaped through hole, and the first arc-shaped through hole 1111 can be spiral on the side wall of the outer lens barrel 111 along the circumferential direction f3 of the outer lens barrel 111. The circumferential direction f3 of the barrel 111 may be parallel to one turn of the bottom surface of the outer lens barrel 111 .

The numbers of at least one first strip-shaped through hole 1121 , at least one first arc-shaped through hole 1111 and at least one first connecting shaft 113 are the same. The first connecting shaft 113 can pass through the first strip-shaped through hole 1121 and the first arc-shaped through hole 1111 to be fixedly connected to the second mirror group 132, the second mirror group 132 can be located inside the inner lens barrel 112, the first connecting shaft 113 can be located in the first bar-shaped through hole 1121 and the first arc-shaped through hole 1111 and is rotatably connected with the first bar-shaped through hole 1121 and the first arc-shaped through hole 1111, so that the first connecting shaft 113 can move along the first bar-shaped through hole 1121 and the first arc-shaped through hole 1111. The strip-shaped through hole 1121 and the first arc-shaped through hole 1111 slide.

The outer lens barrel 111 can rotate around the axial direction f2 of the inner lens barrel 112, so that the first connecting shaft 113 can slide in the first strip-shaped through hole 1121 and the first arc-shaped through hole 1111, thereby driving the second lens group 132 moves in a direction parallel to the optical axis of the second mirror group 132 . Exemplarily, when the outer lens barrel 111 rotates, the first connecting shaft 113 slides along the first arc-shaped through hole 1111 of the outer lens barrel 111, that is, the connecting shaft 113 can move along the circumferential direction f3 and the axial direction f4 of the outer lens barrel 111, The axial direction f4 of the outer lens barrel 111 can be parallel to the axis C4 of the outer lens barrel 111, and the axis C4 of the outer lens barrel 111 and the axis C3 of the inner lens barrel 112 can be collinear, and at the same time, the first connecting axis 113 can be along the inner lens The first strip-shaped through hole 1121 of the barrel 112 slides, that is, the connecting shaft 113 can move along the axial direction f2 of the inner lens barrel 112, so that the rotational movement of the outer lens barrel 111 can be transformed into the first connecting shaft 113 moving along the inner lens barrel 112. The axial f2 of the inner barrel 112 moves along the axial direction f2, and the first connecting shaft 113 moving along the axial f2 of the inner barrel 112 can drive the second lens group 132 to move in a direction parallel to the optical axis of the second lens group 132 .

The first arc-shaped through hole 1111 of the outer lens barrel 111 and the first bar-shaped through hole 1121 of the inner lens barrel 112 are connected through the first connecting shaft 113 , so that the adjustment process of the adjustment assembly 11 can be smooth and stable.

In some embodiments, please refer to FIG. 13 , FIG. 14 and FIG. 15 , the adjustment assembly 11 may further include at least one second connecting shaft 114 . The side wall of the inner lens barrel 112 may also have at least one second strip-shaped through hole 1122 , the length direction of the second strip-shaped through hole 1122 is parallel to the axial direction f2 of the inner lens barrel 112 . In the embodiment of the present disclosure, the first strip-shaped through hole 1121 and the second strip-shaped through hole 1122 may extend along the same line parallel to the axis C3 on the side wall of the inner lens barrel 112 and be spaced apart, that is, the first strip-shaped through-hole 1122 The first strip-shaped through hole 1121 and the second strip-shaped through-hole 1122 are at the same position in the circumferential direction of the inner lens barrel 112; Different lines on the wall parallel to the axis C3 extend and are spaced apart, that is, the first strip-shaped through hole 1121 and the second strip-shaped through hole 1122 are located at different positions in the circumferential direction of the inner lens barrel 112 .

The side wall of the outer barrel 111 can also have at least one second arc-shaped through hole 1112, the second arc-shaped through-hole 1112 is in a spiral shape, and the extending direction of the second arc-shaped through-hole 1112 is the same as that of the first arc-shaped through-hole 1111. The direction of extension is opposite.

The numbers of at least one second bar-shaped through hole 1122 , at least one second arc-shaped through hole 1112 and at least one second connecting shaft 114 are the same. The second connecting shaft 114 can pass through the second strip-shaped through hole 1122 and the second arc-shaped through hole 1112 to be fixedly connected to the first lens group 131, the first lens group 131 is located inside the inner lens barrel 112, and the outer lens barrel 111 surrounds The axial f2 of the inner lens barrel 112 rotates, so that the second connecting shaft 114 slides in the second strip-shaped through hole 1122 and the second arc-shaped through hole 1112, so as to drive the first lens group 131 along the direction parallel to the second lens group 132. direction of the optical axis. In this way, the adjustment assembly 11 can simultaneously drive the first mirror group 131 and the second mirror group 132 to move along a direction parallel to the optical axis of the second mirror group 132, which can prevent the optical engine 10 from The focal power changes.

In some embodiments, the inner barrel 112 may have a plurality of first strip-shaped through holes 1121 and a plurality of second strip-shaped through holes 1122, and a plurality of first strip-shaped through holes 1121 and a plurality of second strip-shaped through holes 1122 are evenly distributed along the circumference of the inner barrel 112 . The outer lens barrel 111 may have a plurality of first arc-shaped through holes 1111 and a plurality of second arc-shaped through holes 1112, and the plurality of first arc-shaped through holes 1111 and the plurality of second arc-shaped through holes 1112 are all along the outer lens barrel. The circumferential direction f3 of 111 is evenly distributed.

Exemplarily, the number of the first strip-shaped through hole 1121, the second strip-shaped through hole 1122, the first arc-shaped through hole 1111, the second arc-shaped through hole 1112, the first connecting shaft 113 and the second connecting shaft 114 All can be three. The three first strip-shaped through holes 1121 may be in one-to-one correspondence with the three first arc-shaped through holes 1111 , and the three second strip-shaped through holes 1122 may be in one-to-one correspondence with the three second arc-shaped through holes 1112 . Fig. 16 is a schematic diagram of the connection structure of the first connection shaft and the second lens group shown in some embodiments of the present disclosure. As shown in FIG. 16 , the three first connecting shafts 113 are evenly distributed on the edge of the second mirror group 132 and fixedly connected with the second mirror group 132 .

In this way, the three first connecting shafts 113 located in the three first strip-shaped through holes 1121 and the three first arc-shaped through holes 1111 respectively can be made When sliding in the middle, the sliding strokes of the three first connecting shafts 113 are the same; similarly, the three second connecting shafts 114 respectively located in the three second bar-shaped through holes 1122 and the three second arc-shaped through holes 1112 When sliding in the second bar-shaped through hole 1122 and the second arc-shaped through hole 1112 , the three second connecting shafts 114 have the same sliding stroke. Thus, the mechanism of the adjustment assembly 11 can be made more stable, and the positions of the first mirror group 131 and the second mirror group 132 can be adjusted more accurately.

Fig. 17 is a schematic structural diagram of another optical engine provided by some embodiments of the present disclosure. In some embodiments, as shown in FIG. 17 , the optical engine 10 may further include a homogenization component 18, which can be used to homogenize the light beam emitted by the light source, and send the homogenized light beam to the lighting component. 13.

The uniform light assembly 18 may include a first light pipe 181 and a second light pipe 182 sleeved outside the first light pipe 181, the second light pipe 182 can move in the length direction of the first light pipe 181, and the first light pipe 181 has a first light outlet 1811 , the second light pipe 182 has a second light outlet 1821 , and the size of the first light outlet 1811 is smaller than the size of the second light outlet 1821 .

FIG. 18 is a schematic diagram of another state of the light homogenizing component in the optical engine shown in FIG. 17 . As shown in Figure 18, when the second light outlet 1821 of the second light guide 182 is located on the side of the first light outlet 1811 of the first light guide 181 close to the side of the lighting assembly 13, the light outlet of the uniform light assembly 18 can be the second The second light outlet 1821 of the light pipe 182, at this time, the size of the light outlet of the light uniform component 18 is larger, and the size of the light beam emitted by the light uniform component 18 is larger.

As shown in FIG. 17 , when the light outlet of the second light guide 182 is located on the side away from the first light outlet 1811 of the first light guide 181 away from the lighting assembly 13 , the light outlet of the uniform light assembly 18 can be the first light guide 181 At this time, the size of the light outlet of the uniform light component 18 is relatively small, and the size of the light beam emitted by the uniform light component 18 is relatively small. In this way, the size of the light beam emitted by the dodging component 18 can be adjusted by adjusting the size of the light outlet of the dodging component 18 , and then the aperture value of the optical engine 10 can be adjusted. Exemplarily, when the light exit port of the light uniform component 18 is the first light exit port 1811 of the first light pipe 181, the size of the light beam emitted by the light uniform component 18 is smaller, the aperture value of the optical engine 10 is larger, and the aperture value is smaller . It should be noted that the uniform light assembly 18 in the embodiment of the present disclosure may also include a third light guide or a fourth light guide and more light guides, and thus may have more light outlets of different sizes. There is no limit to this.

The first light guide 181 and the second light guide 182 can both be hollow light guides. The hollow light guide is a tubular device spliced by four planar reflectors. The light is reflected multiple times inside the hollow light guide to achieve uniform light. Effect. Or, the first light guide 181 can be a solid light guide, and the light entrance and the light exit of the solid light guide are rectangles with the same shape and area. The beam is emitted from the mouth, and the beam homogenization and spot optimization are completed during the process of passing through the solid light guide.

In some embodiments, the light source assembly 100 may include a laser light source and a light conversion unit. The light conversion unit receives laser light from the laser light source, and converts the laser light into visible light of various colors to provide to the uniform light component 18 . Exemplarily, the light source component is used to provide visible light, such as light in the red band, green band and blue band, or to provide light in the red band, green band, blue band and yellow light bands of light.

In some embodiments, as shown in FIG. 8 and FIG. 9 , the optical engine 10 may further include: a fourth mirror group 15 , and the fourth mirror group 15 may be located between the reflector 230 and the prism assembly 250 .

The reflector 230 can be used to receive the light beam transmitted by the third mirror group 133 and reflect the light beam to the fourth mirror group 15. The light beam received by the lens group 15 is guided to the light valve 14 , and the light beam reflected by the light valve 14 is guided to the lighting assembly 13 . The included angle between the normal of the reflector 230 and the optical axis of the third mirror group 133 can be 45 degrees, and the reflector 230 can be used to fold the illumination light path to shorten the system in a direction parallel to the optical axis of the third mirror group 133. The distance makes the volume of the optical engine smaller.

FIG. 19 is a schematic diagram of a partial structure of the optical engine shown in FIG. 8 . As shown in FIG. 19 , the prism assembly 250 can include two prisms, which can be used to change the path of the beam in the optical engine 10 and separate the illumination beam and the image beam in the optical engine 10 .

The prism assembly 250 may include a first prism 171 surrounded by a first light incident surface D1, a reflective surface D2 and a light valve light incident surface D3, and a second prism surrounded by a second light incident surface D4, a light exit surface D5 and a bottom surface D6 172. The reflective surface D2 and the second light incident surface D4 may be oppositely disposed. The fourth lens group 15 may be located outside the first light incident surface D1, the light valve 14 may be located outside the light incident surface D3, and the lens assembly may be located outside the light exit surface D5.

The first incident surface D1 can be used to receive the illuminating light beam emitted by the fourth mirror group 15 and guide the illuminating light beam to the reflective surface D2. The reflective surface D2 can be used to reflect the illumination beam to the light incident surface D3 of the light valve so as to enter the light valve 14 through the light incident surface D3 of the light valve. The light incident surface D3 of the light valve can be used to receive the image beam processed by the light valve 14 and guide the image beam to the reflective surface D2. The image beam can pass through the reflection surface D2 , the second light incident surface D4 and the light exit surface D5 to exit the prism assembly 250 .

To sum up, some embodiments of the present disclosure provide an optical engine, including: an adjustment component, a light source component, a lighting component, and a light valve. The lighting component includes a first mirror group, a second mirror group and a third mirror group. The second mirror group is driven to move on the support part by the adjustment component to adjust the distance between the second mirror group and the third mirror group, thereby adjusting the numerical aperture angle of the light beam irradiated to the light valve, and then adjusting the aperture of the optical engine value. In this way, the optical engine can have multiple aperture values, so that the optical engine can be adapted to projection lenses with various apertures. The problem of low adaptability of the optical engine in the related art can be solved, and the effect of improving the adaptability of the optical engine is achieved.

In addition, the aperture value of the optical engine assembly can be adjusted to be the same or similar to the aperture value of the projection lens, so that the light energy utilization rate of the optical engine can be improved, or the phenomenon that the brightness of the optical engine cannot meet the requirements of the projection lens can be avoided.

An embodiment of the present disclosure further provides a projection device, where the projection device may include the optical engine in any one of the above embodiments, and the optical engine includes a zoom lens.

In some embodiments, the aperture value of the optical mechanical assembly is greater than the aperture value of the projection lens, and the difference between the aperture value of the optical mechanical assembly and the aperture value of the projection lens is in the range of 0.1-0.3. In this way, the aperture value of the optical mechanical assembly can be matched with the aperture value of the projection lens, and the utilization rate of light energy of the optical engine can be improved. Exemplarily, when the aperture value of the zoom lens is relatively large, the aperture value of the optomechanical assembly may also be relatively large.

To sum up, some embodiments of the present disclosure provide a projection device, and the optical engine in the projection device includes: an adjustment component, a light source component, a lighting component, and a light valve. The lighting assembly includes a first mirror group, a second mirror group and a third mirror group. Drive the second mirror group to move on the support part by adjusting the assembly to adjust the distance between the second mirror group and the third mirror group, thereby adjusting the numerical aperture angle of the light beam irradiated to the light valve, and then adjusting the aperture of the optical engine value. In this way, the optical engine can have multiple aperture values, so that the optical engine can be adapted to projection lenses with various apertures. The problem of low adaptability of the optical engine in the related art can be solved, and the effect of improving the adaptability of the optical engine is achieved.

In addition, the aperture value of the optical engine assembly can be adjusted to be the same or similar to the aperture value of the projection lens, so that the light energy utilization rate of the optical engine can be improved, or the phenomenon that the brightness of the optical engine cannot meet the requirements of the projection lens can be avoided.

The above descriptions are only some embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure within.

For convenience of explanation, the above description has been made in conjunction with specific implementation manners. However, the above discussion of some embodiments is not intended to be exhaustive or to limit implementations to the specific forms disclosed above. Many modifications and variations are possible in light of the above teachings. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various modified embodiments suitable for specific use considerations.

Claims (10)

A kind of optical engine, described optical engine comprises: a light source assembly configured to provide an illumination beam; a lighting component configured to receive the lighting beam and adjust the light path; The light valve is configured to receive the adjusted illumination light beam of the illumination assembly, and modulate it to obtain an image light beam; an adjustment assembly configured to adjust the numerical aperture angle of the light beam irradiating the light valve; Wherein, the lighting assembly includes a first mirror group, a second mirror group and a third mirror group sequentially arranged along the optical path direction; The second lens group is installed in the adjustment assembly, and the adjustment assembly is used to drive the second lens group to move between the first lens group and the second lens group in a direction parallel to the optical axis of the second lens group. Move between the third lens group. According to the optical engine according to claim 1, the first mirror group is installed in the adjustment assembly, and the adjustment assembly is used to drive the first mirror group to move along the Move in the opposite direction to the moving direction of the second mirror group. The optical engine according to claim 1, further comprising a casing, the adjusting assembly is fixedly installed in the casing, and the third mirror group is fixedly installed in the casing. The optical engine of claim 1, said adjustment assembly comprising: Inner lens barrel, the side wall of the inner lens barrel has at least one first strip-shaped through hole, the length direction of the first strip-shaped through hole is parallel to the axial direction of the inner lens barrel; an outer lens barrel, the outer lens barrel is sleeved on the inner lens barrel, and the side wall of the outer lens barrel has at least one first arc-shaped through hole, At least one first connecting shaft, the first connecting shaft is fixedly connected to the second mirror group through the first strip-shaped through hole and the first arc-shaped through hole, and the second mirror group is located at the inside the inner lens barrel, the outer lens barrel rotates around the axial direction of the inner lens barrel, so that the first connecting shaft slides in the first strip-shaped through hole and the first arc-shaped through hole , so as to drive the second mirror group to move along a direction parallel to the optical axis of the second mirror group. The optical engine according to claim 4, The side wall of the inner lens barrel further includes: at least one second strip-shaped through hole, the length direction of the second strip-shaped through hole is parallel to the axial direction of the inner lens barrel; The side wall of the outer lens barrel includes: at least one second arc-shaped through hole, the second arc-shaped through-hole is in a spiral shape, and the extending direction of the second arc-shaped through-hole is the same as that of the first arc-shaped through-hole. The holes extend in the opposite direction; The adjustment assembly further includes: at least one second connecting shaft; the second connecting shaft passes through the second strip-shaped through hole and the second arc-shaped through hole and is fixedly connected with the first mirror group, so The first lens group is located inside the inner lens barrel, and the outer lens barrel rotates around the axial direction of the inner lens barrel, so that the second connecting shaft is connected between the second strip-shaped through hole and the first lens barrel. sliding in the two arc-shaped through holes to drive the first mirror group to move along the direction parallel to the optical axis of the second mirror group. The optical engine according to claim 5, the inner lens barrel comprises a plurality of the first strip-shaped through holes and a plurality of the second strip-shaped through holes, a plurality of the first strip-shaped through holes and a plurality of the first strip-shaped through holes The second strip-shaped through holes are evenly distributed along the circumference of the inner lens barrel; The outer lens barrel includes a plurality of the first arc-shaped through holes and a plurality of the second arc-shaped through holes, and the plurality of the first arc-shaped through holes and the plurality of the second arc-shaped through holes are all uniformly distributed along the circumference of the outer lens barrel. The optical engine according to claim 1, further comprising a uniform light component, the uniform light component comprises a first light guide and a second light guide sleeved outside the first light guide, the first light guide Two light pipes can move in the length direction of the first light pipe, the first light pipe has a first light outlet, the second light pipe has a second light outlet, and the size of the first light outlet is smaller than The size of the second light outlet. The optical engine according to claim 1, further comprising: a fourth mirror group, a reflector and a prism assembly, the fourth mirror group is located between the reflector and the prism assembly; The reflector is used to receive the light beam transmitted by the third mirror group and reflect the light beam to the fourth mirror group, and the fourth mirror group transmits the light beam to the prism assembly, and the prism assembly It is used for guiding the light beam received from the fourth mirror group to the light valve, and guiding the light beam reflected by the light valve to the lighting assembly. A projection device, comprising the optical engine according to any one of claims 1-8. According to the projection device according to claim 9, the aperture value of the optical engine is larger than the aperture value of the projection lens, and the difference range between the aperture value of the optical engine and the aperture value of the projection lens is 0.1-0.3.

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