Projection device

Abstract

The utility model relates to projection equipment. The projection equipment comprises a driving assembly and a light machine assembly connected to the projection equipment; the first detection piece is used for detecting the distance between a lens of the light machine assembly and the projection surface; the transmission assembly is connected between the driving assembly and the first detection piece, and the driving assembly drives the transmission assembly to drive the first detection piece to swing so as to form a detection area of the first detection piece on the projection surface; and the control module is in electrical signal connection with the driving assembly and the first detection piece, and the control module performs image correction on the picture projected to the projection surface according to the detection parameters of the first detection piece. According to the technical scheme, the technical problems that traditional projection equipment is high in hardware cost, high in assembly precision requirement and complex in data processing are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of projectors, and in particular to a projection device. Background Art

[0002] A projector, also known as a projector, is a device that can project images or videos onto a projection surface such as a wall or a screen. It is widely used in homes, offices, schools, and entertainment venues. According to the principle of direct optics, when the optical position of the projector cannot remain perpendicular to the projection surface, a skewed trapezoidal image will be generated on the projection surface, affecting the user's viewing experience of the projection product.

[0003] In the related technology, traditional projectors generally have two or more TOF (Time of Flight) sensors with a certain angle to detect the plane data of the detection area, so as to perform trapezoidal correction on the projector's image. However, the cost of a single TOF sensor is high, and configuring two or more TOF sensors will greatly increase the hardware cost of the projector; and in order to ensure the accuracy of the data obtained by two or more TOF sensors, the assembly accuracy is extremely high. At the same time, the configuration of two or more TOF sensors also makes the subsequent data processing process complicated and the amount of data calculation is large. Utility Model Content

[0004] The present application provides a projection device to solve the technical problems of high hardware cost, high assembly precision requirement and complex data processing of traditional projection devices.

[0005] To this end, an embodiment of the present application provides a projection device, which includes: a driving component connected to the optical-mechanical component of the projection device; a first detection component, used to detect the distance between the lens of the optical-mechanical component and the projection surface; a transmission component, connected between the driving component and the first detection component, the driving component drives the transmission component to swing the first detection component to form a detection area of ​​the first detection component on the projection surface; a control module, electrically connected to the driving component and the first detection component, the control module being configured to perform image correction on the picture projected onto the projection surface according to the detection parameters of the first detection component.

[0006] In a possible implementation, the transmission assembly includes a crank connected to the driving assembly and a connecting rod connected to the crank, and one end of the connecting rod away from the crank is movably connected to the first detection member.

[0007] In a possible implementation manner, a long hole is provided on the first detection member, and an end of the connecting rod away from the crank is inserted into the long hole and moves along the long hole.

[0008] In a possible implementation, the driving assembly includes a driving motor, a first gear connected to an output shaft of the driving motor, and a second gear meshing with the first gear;

[0009] The crank is eccentrically arranged on the first gear, and the optical-mechanical assembly is connected to the second gear.

[0010] In a possible implementation manner, the position of the crank is adjustable in the radial direction of the first gear.

[0011] In a possible implementation manner, the field of view angle of the first detection element ranges from 30° to 120°.

[0012] In a possible implementation, it further includes a box, in which the optical-mechanical assembly, the first detection component and the transmission assembly are all accommodated;

[0013] One end of the first detection member is rotatably connected to the box body, and the other end is movably connected to the transmission assembly. The transmission assembly drives the first detection member to swing with the connection between the first detection member and the box body as the center and the first detection member's own length as the radius.

[0014] In a possible implementation, the first detection member includes a base and a distance sensor disposed on the base, one end of the base is connected to the box, and the other end of the base is movably connected to the transmission assembly, and the distance sensor is used to detect the distance between the lens and the projection surface.

[0015] In a possible implementation, the control module is further configured to focus the image projected onto the projection surface according to the detection parameters of the first detection element.

[0016] In a possible implementation manner, a second detection member is further included, and the second detection member is used to detect the position of the driving assembly.

[0017] According to the projection device provided by the embodiment of the present application, it includes: a driving component connected to the optical-mechanical component of the projection device; a first detection component for detecting the distance between the lens of the optical-mechanical component and the projection surface; a transmission component connected between the driving component and the first detection component, the driving component drives the transmission component to drive the first detection component to swing, so as to form a detection area of ​​the first detection component on the projection surface; a control module, connected to the driving component and the first detection component signal, and the control module performs image correction on the picture projected to the projection surface according to the detection parameters of the first detection component. The present application configures the projection device as a combined component including a driving component and a first detection component, and obtains multiple sets of data required for image correction of the projection device through the transmission between the driving component and the first detection component. Compared with the configuration of at least two sensors or at least two driving components required for the traditional projector, the projection device provided by the present embodiment reduces the number of the first detection component / driving component at least in terms of quantity, reduces the hardware cost, reduces the assembly accuracy requirements of the projection device, and improves the assembly efficiency and assembly yield of the projection device; at the same time, the data acquisition mode of the single first detection component also greatly reduces the processing complexity of the later data, and improves the projection efficiency and projection effect of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments that conform to the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0019] Figure 1 A schematic diagram of a partial three-dimensional structure of a projection device provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 A front view of the projection device shown;

[0021] Figure 3 for Figure 1 A top view of the projection device shown;

[0022] Figure 4 for Figure 1 A diagram showing a swinging process of a first detection member in the projection device shown;

[0023] Figure 5 for Figure 1 The diagram shows a schematic diagram of a viewing angle formed by a first detection member in a projection device on a projection surface.

[0024] Description of reference numerals:

[0025] 100, driving assembly; 110, driving motor; 120, first gear; 130, second gear;

[0026] 200, first detection member; 201, long hole; 210, base; 220, distance sensor;

[0027] 300, transmission assembly; 310, crank; 320, connecting rod;

[0028] 400, control module;

[0029] A, first extreme position; B, second extreme position; D, middle position; a, first connecting line distance; b, second connecting line distance; d, focusing distance; γ, field of view angle; θ, vertical angle. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0032] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0033] See also Figures 1 to 5 An embodiment of the present application provides a projection device, which includes: a driving component 100, a first detection component 200, a transmission component 300 and a control module 400.

[0034] The driving assembly 100 is connected to the optical-mechanical assembly of the projection device. The optical-mechanical assembly generally includes a light source, a lens assembly, a light homogenization assembly, an image display device and a lens. The light source is used to emit a light beam. The lens assembly is arranged between the light homogenization assembly and the image display device, and is used to converge the light beam shaped by the homogenization to the image display device to form an illumination spot. The image display device can be a digital micromirror array device (DMD), a reflective liquid crystal on silicon panel (LCOS) or a transmissive liquid crystal panel (LCD). The size of the illumination spot matches the size of the image display device, for example, both are rectangular. The lens is used to project the image information emitted from the image display device onto a projection surface such as a curtain or a wall.

[0035] The first detection member 200 is used to detect the distance between the lens of the optical machine assembly and the projection surface. The first detection member 200 can be arranged near the lens and can detect the distance between the lens and the projection surface through ultrasonic, microwave, light wave and other signals.

[0036] The transmission assembly 300 is connected between the driving assembly 100 and the first detection member 200. The driving assembly 100 drives the transmission assembly 300 to swing the first detection member 200 to form a detection area of ​​the first detection member 200 on the projection surface. The detection area is the field of view angle γ of the first detection member 200, and the field of view angle γ forms a first extreme position A and a second extreme position B on the projection surface.

[0037] The control module 400 is electrically connected to the drive assembly 100 and the first detection member 200, and the control module 400 is configured to perform image correction on the image projected onto the projection surface according to the detection parameters of the first detection member 200. The detection parameters may include parameters such as the field of view angle γ, the first line distance a between the first limit position A and the first detection member 200, and the second line distance b between the second limit position B and the first detection member 200. The operator can calculate the vertical angle θ between the lens and the projection surface according to the above parameters, and control the drive assembly 100 to drive the optical machine assembly according to the vertical angle θ. The control module 400 can be a chip or a control mainboard, etc., which is electrically connected to the first detection member 200 to obtain the distance values ​​at multiple positions detected by the first detection member 200 during the swinging process. At the same time, the control module 400 is also electrically connected to the driving component 100. According to the multiple groups of distance values ​​obtained by the first detection member 200 during the swinging process, the driving component 100 is controlled to drive the lens of the optical-mechanical component to rotate until the rotation angle of the optical-mechanical component coincides with the swing angle (field of view angle γ) of the first detection member 200, thereby realizing the trapezoidal correction of the optical-mechanical component.

[0038] In this embodiment, the projection device is configured as a combination component that includes at least a driving component 100, a first detection component 200, a transmission component 300 and a control module 400. The driving component 100 can be a motor, and its output end is connected to the optical-mechanical component of the projection device, which is used to drive the lens of the optical-mechanical component to rotate to achieve focus and projection of the picture, thereby ensuring the projection effect of the projection device.

[0039] At the same time, the driving component 100 also drives the transmission component 300 to swing the first detection member 200. Specifically, the driving component 100 drives the transmission component 300 to rotate back and forth to drive the first detection member 200 to swing back and forth, thereby realizing the detection of different plane data by the first detection member 200. In this way, the detection field angle γ of the first detection member 200 is expanded through the mechanical swing of the first detection member 200, and multiple sets of data required for the projection device to perform trapezoidal correction are obtained.

[0040] Specifically, the driving assembly 100 drives the transmission assembly 300 to swing the first detection member 200 to form a viewing angle γ of the first detection member 200, and the viewing angle γ forms a first extreme position A and a second extreme position B on the projection surface. Figure 5 As shown, a first connection distance a is formed between the first extreme position A on the far right and the first detection member 200, and a second connection distance b is formed between the second extreme position B on the far left and the first detection member 200. The first connection distance a, the second connection distance b and the projection surface form a projection triangle.

[0041] The first connecting line distance a, the second connecting line distance b, and the field angle γ of the fan-shaped swing of the first detection member 200 are taken as operation parameters, and the vertical angle θ of the optical machine is calculated according to the trapezoidal correction formula. Then, the driving component 100 is controlled to drive the optical machine component to rotate according to the vertical angle θ until the rotation angle of the optical machine component completely coincides with the field angle γ, that is, the trapezoidal correction of the lens is completed.

[0042] Specifically, Figure 4 and 5 As shown, the keystone correction formula is:

[0043] c 2 =a 2 +b 2 -2*a*b*cos(γ);

[0044] α=arccos((b 2 +c 2 -a 2 ) / 2*b*c);

[0045] β = 180° - α - γ;

[0046] θ=γ / 2+β.

[0047] Among them, Figure 5 , point C represents the position of the first detection member 200, a represents the first connecting line distance a, b represents the second connecting line distance b, c represents the maximum distance of the screen that can be detected by the first detection member 200, and d represents the focusing distance d; γ represents the field of view angle γ, α represents the angle between the first detection member 200 and the screen at the second extreme position B, β represents the angle between the first detection member 200 and the screen at the first extreme position A, and θ represents the vertical angle.

[0048] Compared with a traditional projector that requires the configuration of at least two sensors or at least two drive components 100, the projection device provided in the embodiment of the present application reduces the number of first detection components 200 / drive components 100 at least in terms of quantity, reduces hardware costs, reduces assembly accuracy requirements for the projection device, and improves assembly efficiency and assembly yield of the projection device; at the same time, the data acquisition mode of a single first detection component 200 also greatly reduces the complexity of later data processing, thereby improving the projection efficiency and projection effect of the projection device.

[0049] In a possible implementation, the control module 400 is further configured to, based on the detection parameters of the first detection member 200. The detection parameters may include parameters such as the field of view angle γ, the first line distance a, and the second line distance b, the operator can calculate the focus distance d between the lens and the projection surface based on the above parameters, and control the drive assembly 100 to drive the optical machine assembly to focus the image projected onto the projection surface based on the focus distance d. In this way, automatic focusing of the projection device is achieved.

[0050] like Figure 4 and Figure 5 As shown, according to the field of view angle γ of the first detection member 200, the first connecting line distance a and the second connecting line distance b, the focus distance d between the lens and the projection surface can be calculated, wherein the focus calculation formula is:

[0051] d = sinβ*b / sinα,

[0052] Then, the driving assembly 100 is controlled to drive the optical-mechanical assembly to rotate according to the focusing distance d, so as to focus the image projected onto the projection surface, that is, to complete the automatic focusing of the lens.

[0053] In a possible implementation, the transmission assembly 300 includes a crank 310 connected to the driving assembly 100 , and a connecting rod 320 connected to the crank 310 , and one end of the connecting rod 320 away from the crank 310 is movably connected to the first detection member 200 .

[0054] In the present embodiment, the specific configuration of the transmission assembly 300 is optimized. Specifically, the transmission assembly 300 is configured as a composite member including at least a crank 310 and a connecting rod 320, and the crank 310 end of the transmission assembly 300 is configured as a curved motion trajectory of two composite forms of revolution and rotation, and at the same time, the end of the transmission assembly 300 connected to the first detection member 200 is configured as a composite motion trajectory of linear motion and arc motion. That is to say, on the one hand, the crank 310 end of the transmission assembly 300 can rotate with the output end of the drive assembly 100 and perform circular motion to realize the reciprocating motion of the transmission assembly 300; on the other hand, the crank 310 end of the transmission assembly 300 can also rotate around itself so that the transmission assembly 300 can always remain connected to the first detection member 200. One end of the transmission component 300 connected to the first detection member 200 can make a linear motion along the first detection member 200. At the same time, the end can swing synchronously with the swing of the first detection member 200. In this way, the horizontal displacement and vertical displacement of the transmission component 300 on the driving component 100 side can be compensated by the linear displacement and synchronous swing of the transmission component 300 on the first detection member 200 side, thereby ensuring that the transmission between the driving component 100 and the first detection member 200 can proceed normally.

[0055] like Figure 2 and Figure 4 As shown, when the transmission assembly 300, the driving assembly 100 and the first detection member 200 are located in the same vertical plane, the driving assembly 100 is rotated counterclockwise, and when the crank 310 end of the transmission assembly 300 moves to the leftmost end of the driving assembly 100, the other end of the transmission assembly 300 moves to the lower limit position of the first detection member 200. At this time, the transmission assembly 300 drives the first detection member 200 to swing close to the driving assembly 100, and the first detection member 200 is located at the first limit position A; continue to rotate the driving assembly 100 counterclockwise, when the other end of the transmission assembly 300 moves When the crank 310 end of the transmission assembly 300 moves to the rightmost end of the driving assembly 100, the other end of the transmission assembly 300 moves to the upper limit position of the first detection member 200. At this time, the transmission assembly 300 drives the first detection member 200 to swing away from the driving assembly 100, and the first detection member 200 is located at the second limit position B; when the crank 310 end of the transmission assembly 300 moves to the uppermost or lowermost end of the driving assembly 100, the other end of the transmission assembly 300 moves to the second limit position BD of the second detection member. At this time, the first detection member 200 is located in the middle position D, and the first detection member 200 is located in the vertical direction. In this way, after the driving assembly 100 rotates one circle, the transmission assembly 300 moves back and forth, and the first detection member 200 swings one cycle.

[0056] In one example, the crank 310 can be arranged in parallel with the output shaft of the driving assembly 100, but not coaxial with the output shaft of the driving assembly 100, so that the crank 310 can be driven to rotate by the driving assembly 100, thereby driving the transmission assembly 300 connected to the crank 310 to make a circular motion. At the same time, the crank 310 end of the transmission assembly 300 can rotate around the axis of the crank 310, so that the revolution and rotation of the crank 310 end of the transmission assembly 300 can be realized simultaneously by the driving assembly 100, and the reciprocating movement of the transmission assembly 300 is realized while ensuring the connection stability of the transmission assembly 300 with the driving assembly 100 and the first detection member 200, so as to realize the precise swing of the first detection member 200, improve the trapezoidal correction accuracy and focusing accuracy of the projection device, and improve the projection effect.

[0057] In a possible implementation manner, the first detection member 200 is provided with an elongated hole 201 , and one end of the connecting rod 320 away from the crank 310 is inserted into the elongated hole 201 and moves along the elongated hole 201 .

[0058] In this embodiment, the connection mode of the transmission assembly 300 is optimized. Specifically, a long hole 201 is arranged on the first detection member 200, and the long hole 201 can be a straight strip waist hole arranged at the bottom of the first detection member 200, which can extend along the length direction of the first detection member 200. The connecting rod 320 is movably inserted into the long hole 201. For example, a movable shaft or other components can be arranged on the connecting rod 320 and penetrated into the long hole 201. The other end of the movable shaft is connected to the first detection member 200 through a fastening limiter such as a nut, so as to realize the reciprocating motion of the connecting rod 320 along the long hole 201 along its own length direction and its synchronous swing with the first detection member 200.

[0059] In a possible embodiment, the driving assembly 100 includes a driving motor 110, a first gear 120 connected to the output shaft of the driving motor 110 and a second gear 130 meshing with the first gear 120; the crank 310 is eccentrically arranged on the first gear 120, and the optical-mechanical assembly is connected to the second gear 130.

[0060] In this embodiment, the specific configuration of the driving assembly 100 is optimized. Specifically, the driving assembly 100 is configured as a combination component including at least a driving motor 110, a first gear 120 and a second gear 130. The first gear 120 can be a large gear, which is coaxially arranged with the output shaft of the driving motor 110; the second gear 130 can be a small gear, which is circumferentially meshed on the circumference of the first gear 120. The second gear 130 is also configured at the lens of the optical machine assembly and can rotate synchronously with the first gear 120, thereby driving the lens of the optical machine assembly to rotate, realize automatic focus and keystone correction of the lens, ensure the integrity of the projection picture, and improve the projection effect.

[0061] In a possible implementation, the position of the crank 310 is adjustable in the radial direction of the first gear 120. With this arrangement, the position of the crank 310 can be adjusted in the radial direction so that the first detection member 200 forms different viewing angles γ, thereby achieving trapezoidal correction and focusing of the optical-mechanical screen in different scenes, making the projection device applicable to different correction scenes, and improving the universality of the projection device.

[0062] In a possible implementation manner, the viewing angle γ of the first detection member 200 has an angle range of 30°.

[0063] ~120°. Such an arrangement can make the overall length of the transmission assembly 300 appropriate, the swing amplitude of the first detection member 200 appropriate, and the first detection member 200 and the drive assembly 100 not interfere with each other, thereby ensuring the trapezoidal correction operation and focusing operation of the projection device. It should be understood that when the field of view angle γ of the first detection member 200 is too small, the overall length of the transmission assembly 300 is too short, and the first detection member 200 may collide with the drive assembly 100 during the swinging process, thereby causing damage to the first detection member 200 and the drive assembly 100, and the risk of use is high; when the field of view angle γ of the first detection member 200 is too large, the overall length of the transmission assembly 300 is too long, and the drive assembly 100 needs to provide a larger eccentric distance for the installation of the transmission assembly 300, resulting in excessive space occupied by the drive assembly 100 and the transmission assembly 300, and a large volume of the projection device.

[0064] In a possible implementation, it also includes a box (not shown in the figure), in which the first detection member 200 and the transmission assembly 300 are both accommodated; one end of the first detection member 200 is rotatably connected to the box, and the other end is movably connected to the transmission assembly 300, and the transmission assembly 300 drives the first detection member 200 to swing with the connection between the first detection member 200 and the box as the center and the first detection member 200's own length as the radius.

[0065] In this embodiment, the specific configuration of the projection device and the connection mode of the first detection member 200 are further optimized. Specifically, the projection device is configured as a combination component including at least a driving component 100, a first detection member 200, a transmission component 300, a control module 400 and a housing, and the housing can be a square box-shaped structure, which has a containing chamber for accommodating the optical-mechanical component, the first detection member 200 and the transmission component 300. A projection window and a detection window are provided on the housing, and the projection window can be a circular or square window, which is compatible with the lens of the optical-mechanical component; the detection window can be an arc or curved window, which is compatible with the swing trajectory of the swing end of the first detection member 200.

[0066] At the same time, one end of the first detection member 200 is configured to be a fixed-point rotation connection, and the other end of the first detection member 200 is configured to be a minor arc motion trajectory, so as to achieve the fan-shaped swing of the first detection member 200. Figure 4 and Figure 2As shown, when the transmission assembly 300, the driving assembly 100 and the first detection member 200 are located in the same vertical plane, the driving assembly 100 is rotated counterclockwise, and when the crank 310 end of the transmission assembly 300 moves to the leftmost end of the driving assembly 100, the other end of the transmission assembly 300 moves to the lower limit position of the first detection member 200. At this time, the transmission assembly 300 drives the first detection member 200 to swing close to the driving assembly 100, and the first detection member 200 is located at the first limit position A at the rightmost end; continue to rotate the driving assembly 100 counterclockwise, and when the other end of the transmission assembly 300 moves When the crank 310 end of the transmission assembly 300 moves to the rightmost end of the driving assembly 100, the other end of the transmission assembly 300 moves to the upper limit position of the first detection member 200. At this time, the transmission assembly 300 drives the first detection member 200 to swing away from the driving assembly 100, and the first detection member 200 is located at the second limit position B at the leftmost end; when the crank 310 end of the transmission assembly 300 moves to the uppermost or lowermost end of the driving assembly 100, the other end of the transmission assembly 300 moves to the second limit position BD of the second detection member. At this time, the first detection member 200 is in the original position and the first detection member 200 is located in the middle vertical direction. In this way, after the driving assembly 100 rotates one circle, the transmission assembly 300 moves back and forth, and the first detection member 200 swings one cycle.

[0067] In one example, the projection device further includes a support member (not shown) disposed in the housing, which is arranged in the housing chamber of the housing and is used to provide support force to the optical machine assembly. The optical machine assembly is arranged on the support member, and the lens of the optical machine assembly is arranged corresponding to the projection window to achieve projection. The first detection member 200 is arranged in the housing chamber of the housing, and the swing end of the first detection member 200 is arranged corresponding to the detection window to enhance the receiving and sending signals of the first detection member 200 and improve the accuracy of the detection result.

[0068] In a possible implementation, the first detection member 200 includes a base 210 and a distance sensor 220 disposed on the base 210, one end of the base 210 is connected to the box, and the other end of the base 210 is movably connected to the transmission assembly 300, and the distance sensor 220 is used to detect the distance between the lens and the projection surface. The distance sensor 220 can be, for example, but not limited to, a TOF sensor, an infrared sensor, or a photoelectric sensor. Preferably, the distance sensor 220 is a TOF sensor, which includes a transmitter disposed on one side of the lens and a reflector disposed on one side of the projection surface, and the distance between the two is calculated by measuring the "flight time" of ultrasonic, microwave, light, and other signals between the transmitter and the reflector.

[0069] In this embodiment, the specific configuration of the first detection member 200 is optimized. Specifically, the first detection member 200 is configured to include at least a combination of a base 210 and a distance sensor 220. The base 210 can be a rectangular plate-like structure, with a circular hole on one end and a long hole 201 on the other end; the circular hole can cooperate with fasteners such as screws / bolts to rotatably connect the base 210 to the housing of the projection device; the long hole 201 cooperates with the transmission assembly 300 to drive the end base 210 to make an arc motion through the transmission assembly 300, so that the overall motion area of ​​the first detection member 200 is a fan-shaped area. The distance sensor 220 can be a TOF sensor, which is configured between the circular hole and the long hole 201. The distance sensor 220 can be connected to the base 210 by bonding or the like, and is arranged directly opposite to the detection window on the housing of the projection device to avoid signal shielding of the distance sensor 220 through the detection window.

[0070] In a possible implementation manner, a second detection member (not shown in the figure) is further included, and the second detection member is used to detect the position of the driving assembly 100 .

[0071] In this embodiment, the specific configuration of the projection device is further optimized. Specifically, the projection device is configured to include at least a driving component 100, a first detection member 200, a transmission component 300, a control module 400 and a combination of a second detection member, wherein the second detection member may be an optical coupling sensor, which is disposed close to the driving component 100 and is used to determine the position of the driving component 100. Thus, before the first detection member 200 is swung, the driving component 100 can be returned to the initial position according to the position information detected by the second detection member, so as to facilitate the subsequent driving of the lens to perform accurate trapezoidal correction and focus on the projected image.

[0072] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0073] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A projection device, characterized in that: include: A driving assembly connected to an optical-mechanical assembly of a projection device; A first detection member, used to detect the distance between the lens of the optical-mechanical assembly and the projection surface; a transmission assembly connected between the driving assembly and the first detecting member, wherein the driving assembly drives the transmission assembly to swing the first detecting member so as to form a detection area of ​​the first detecting member on the projection surface; A control module is electrically connected to the driving component and the first detection element, and the control module is configured to perform image correction on the picture projected onto the projection surface according to the detection parameters of the first detection element.

2. The projection device according to claim 1, characterized in that: The transmission assembly comprises a crank connected to the driving assembly and a connecting rod connected to the crank, and one end of the connecting rod away from the crank is movably connected to the first detection member.

3. The projection device according to claim 2, characterized in that: The first detection member is provided with a long hole, and one end of the connecting rod away from the crank is inserted into the long hole and moves along the long hole.

4. The projection device according to claim 3, characterized in that: The driving assembly includes a driving motor, a first gear connected to an output shaft of the driving motor, and a second gear meshing with the first gear; The crank is eccentrically arranged on the first gear, and the optical-mechanical assembly is connected to the second gear.

5. The projection device according to claim 4, characterized in that: The position of the crank is adjustable in the radial direction of the first gear.

6. The projection device according to claim 1, characterized in that: The viewing angle of the first detection member ranges from 30° to 120°.

7. The projection device according to claim 1, characterized in that: It also includes a box, in which the optical-mechanical assembly, the first detection component and the transmission assembly are all accommodated; One end of the first detection member is rotatably connected to the box, and the other end is movably connected to the transmission assembly. The transmission assembly drives the first detection member to swing with the connection between the first detection member and the box as the center and the first detection member's own length as the radius.

8. The projection device according to claim 7, characterized in that: The first detection member includes a base and a distance sensor arranged on the base, one end of the base is connected to the box, and the other end of the base is movably connected to the transmission assembly, and the distance sensor is used to detect the distance between the lens and the projection surface.

9. The projection device according to claim 1, characterized in that: The control module is further configured to focus the image projected onto the projection surface according to the detection parameters of the first detection element.

10. The projection device according to claim 1, characterized in that: It also includes a second detection member, which is used to detect the position of the driving component.

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