CN113075852A

CN113075852A - Mural type short-focus projection screen and control method

Info

Publication number: CN113075852A
Application number: CN202110374705.XA
Authority: CN
Inventors: 李龙民; 李丽; 郑业双; 孔明; 陈丽敏; 张亚星
Original assignee: Qingdao University of Science and Technology
Current assignee: Qingdao University of Science and Technology
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-07-06

Abstract

The invention discloses a mural type short-focus projection screen and a control method, and relates to the field of projection display. The screen comprises an integral frame structure, a support running guide rail, a power module, a drive, a position location, a projection screen, canvas, a canvas transmission belt roller, a motor connecting shaft with a threaded structure and a support power connecting assembly. Because the whole frame structure on the outer side of the mural type projection screen is thick and heavy, the screen is usually arranged at the position far away from the edge of the frame in order to prevent the canvas from interfering with the screen when being lifted during manufacturing, and because of the characteristics of short-focus projection and the thickness and the weight of the frame of the screen, the light projected by the projection equipment is extremely easy to be shielded by the surrounding shell.

Description

Mural type short-focus projection screen and control method

Technical Field

The invention belongs to the technical field of projection display, and particularly relates to a mural type short-focus projection screen and a control method.

Background

With the continuous development of short-focus projection technology, projection display technology gradually enters thousands of households, especially laser projection technology. Due to the nature of projection technology, it is often necessary to equip a dedicated light-resistant projection screen. The size of the screen is usually large, and the screen is usually designed into a mural form for aesthetic appearance, namely, when the screen is used, the mural is folded, the picture is projected on the screen, and when the screen is not used, the canvas falls down to be displayed as a pair of pictures. The position of a traditional mural type short-focus projection screen is unchanged before and after the canvas is lifted.

Referring to fig. 1, in the case of a wall painting type projection screen, when the canvas is folded, the folded canvas is accommodated inside the wall painting type projection screen, and the housing structure 16 is relatively thick and heavy. Meanwhile, in order to prevent the interference between the canvas and the projection screen, the screen 17 is generally installed on one side close to the wall and is about 7cm to 10cm away from the outermost frame of the mural screen. For short-focus projection, the projection angle 20 is large, and the image light 18 projected by the projection device 15 is blocked by the opaque mural border housing 16, so that the image light 19 that should be projected on the screen 17 cannot be normally projected on the screen, and the image of the bottom or other parts is not complete.

Disclosure of Invention

The application provides a mural-type short-focus projection screen and a control method, and solves the problem that light rays of mural-type short-focus projection in the projection process are shielded by a screen frame shell structure.

In order to solve the above technical problems, the present application proposes the following technical solutions to implement:

a mural-type short-focus projection screen system is designed, the screen comprising: the device comprises a support, an operation guide rail, a power module, a driving module, a position positioning module, a projection screen, canvas, a canvas transmission belt, a roller wheel, a motor connecting shaft with a threaded structure and a support power connecting assembly. The support and the running guide rail are characterized by comprising a guide rail groove 3, a motion support assembly 7, a roller 2 in the guide rail groove and a roller 13 between the contact point of the support 7 and a frame 9, wherein the motion support assembly drives a screen to do telescopic motion under the pushing of a power module 8, so that the pushing and retracting actions of the screen are realized. The power module 8 is connected with the driving part through a threaded structure, and drives the power module to move stably and slowly through the rotation of the motor main shaft. In order to ensure the stability and accuracy of the canvas operation, the canvas conveying belt is connected with the power motor 21 by adopting a saw-toothed structure 22.

According to the attached figure 4, an infrared transmitting assembly on one side of a mural frame is controlled by software to transmit infrared light at one time, an infrared receiving assembly on the other side receives the infrared light at a transmitting end, if the infrared light is shielded at a certain position by a screen, a receiving end on the other side cannot receive an infrared signal, the situation that the screen moves to the position can be judged, and position information is reported.

Compared with the prior art, the design advantage that this application provided is: accessible power motor starts the back at projection equipment, will receive projected anti light screen propelling movement to mural painting formula short burnt projection screen frame edge, has prevented that the shell structure of edge frame from causing the phenomenon of sheltering from to partial projection light. Meanwhile, the specific position pushed by the screen can be detected constantly through the position detection assembly, and structural interference with the canvas in the lifting and descending processes of the canvas is prevented. The invention can effectively solve the problem of picture shielding of the mural type short-focus screen in the projection process and provides a foundation for the modeling design of the frame shell.

Other features of the present application will become apparent from the following detailed description of implementations of the present application when read in conjunction with the accompanying drawings.

Drawings

FIG. 1 is a prior art mural-type short-focus projection screen

FIG. 2 is a mural-type short-focus projection screen diagram according to an embodiment of the present application

Connection diagram of canvas transmission belt and power motor mentioned in the embodiment of fig. 3

FIG. 4 is a drawing of a position-locating component of the embodiment of the application

FIG. 5 is a flow chart of the control of the embodiment of the application

Detailed Description

Embodiments of the proposed design of the application are explained in detail below with reference to the drawings.

This application provides a new mural formula short burnt projection screen structure based on current mural formula short burnt projection screen. According to the attached figure 2, the device comprises a support 7, a running guide rail 3, a power module and a drive 6 thereof, position positioning modules 11-12, a projection screen 14, a canvas conveying belt 4 and a roller assembly 1 thereof, a motor connecting shaft with a threaded structure and a support power connecting assembly 8.

Specifically, all the components are matched with each other to complete the stable and accurate movement of the projection screen together. The projection equipment is started, the power module and the driving part thereof receive the control signal to rotate, and the motor connecting shaft and the support power connecting assembly move relatively through a thread structure. The back and forth movement of the component 8 drives the bracket 7 to move, and the bracket 7 drives the projection screen to move back and forth under the cooperation of the running guide rail and each roller 13.

Based on the above proposed mural-type short-focus projection screen structure, a control method for the structure is also proposed, which comprises the following steps according to fig. 5:

and S001 and S002, the projection equipment synchronously uploads the command to the screen control end when receiving the power-on and power-off command, and the control signal received by the screen control end is a power-on command or a power-off command.

Step S003: and after the screen control end receives a power-on or power-off command, starting the canvas motor and the screen pushing motor.

Step S004: according to the attached figure 4, the two sides of the frame are respectively provided with an infrared transmitting assembly 23 and an infrared receiving assembly 24, the control center controls the infrared transmitting assemblies to sequentially transmit infrared signals, and the corresponding infrared receiving assemblies are started. Such as: at a certain moment, A in the infrared transmitting assembly sends out an infrared signal, other infrared transmitting devices of the transmitting assembly stop working, and A' in the infrared receiving assembly is started to receive the signal at the same time. After the A and the A ' are started, the A and the A ' stop running, then the B and the B ' run, and in the same way, the C ', the D ', the E ', the F ', the G ', the H and the H ' sequentially carry out scanning detection, namely, only one sending and receiving end of one group of infrared emission assemblies and one receiving assembly work at the same time. If a certain transmitting assembly and a certain receiving assembly are obviously smaller than normal values in the process, the screen is judged to be positioned between the transmitting assembly and the receiving assembly at the moment.

Step S005: the interference of the screen and the canvas on the position is prevented in the motion process, and the speed and the starting and stopping of the canvas lifting motor and the screen pushing motor are controlled in the process.

According to the device setting and control method, when the projection equipment is started and stopped, the lifting of the canvas of the mural type short-focus projection screen and the pushing of the inner screen from the inner side to the outer side are controlled, and the phenomenon that part of light rays cannot normally reach the projection screen due to the influence of the appearance of the picture frame shell is avoided.

It should be noted that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also make changes, modifications, additions or substitutions within the spirit and scope of the present invention.

Claims

1. The mural-type short-focus projection screen includes:

the device comprises a support, an operation guide rail, a power module, a drive of the power module, a position positioning device, a projection screen, canvas, a canvas transmission belt, a roller wheel of the canvas transmission belt, a motor connecting shaft with a threaded structure and a support power connecting assembly.

2. The apparatus of claim 1, wherein the carriage runs a rail supporting the projection screen and is driven by a power source to move slowly back and forth.

3. The system of claim 1, wherein the position locating module is installed at two sides of the frame structure, one side of the position locating module sends a locating signal, the other side of the position locating module receives the locating signal, and the screen motion position is determined according to the shielding condition of the screen on the signal.

4. The portable screen of claim 1, wherein the motor connecting shaft of the screw structure and the power connecting component of the bracket can change relative positions according to the rotation of the motor, so as to drive the bracket connected with the screen to move relatively along the running guide rail.

5. The canvas of claim 1, wherein the canvas is directly connected to the canvas conveyor belt and driven by rollers of the canvas conveyor belt to move along the canvas conveyor belt.

6. A mural type short-focus projection screen control method is applied to the mural type short-focus projection screen of any one of claims 1 to 5, and is characterized in that after a projection device receives a starting signal, the projection screen is controlled to be started, a canvas is lifted and taken into the rear side of a frame, after the device receives the starting signal, a position positioning sending end continuously scans in a mode of emitting infrared signals, corresponding receiving ends are sequentially started to receive the canvas, the specific position of screen movement is judged according to the received signal, and then canvas lifting action and screen pushing and withdrawing action are completed.