Screen projection device for multimedia teaching

A technology for multimedia teaching and screen projection, applied in projection devices, educational appliances, optics, etc., can solve the problems of folded and damaged curtains, difficulty in controlling the unfolding effect, etc., achieve the effect of easy unfolding arc and improve the effect of video viewing

Inactive Publication Date: 2021-11-19
HEBEI VOCATIONAL & TECHN COLLEGE OF BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the projection screen set on the curved surface is folded and stored, the screen is prone to wrinkle damage, and the unfolding effect is difficult to control, and a multimedia teaching screen projection device is proposed.

Method used

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  • Screen projection device for multimedia teaching
  • Screen projection device for multimedia teaching
  • Screen projection device for multimedia teaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see Figure 1-3 A screen projection device for multimedia teaching, comprising a screen projection bracket and a curtain 5; the screen projection bracket includes a support rod 1, a support beam 2, a curtain adjustment mechanism 3, a lifting control mechanism 4, four support rods 1 and two support beams 2 are enclosed to form a projection screen bracket, the screen adjustment mechanism 3 is installed inside the support beam 2, the lifting control mechanism 4 is arranged inside the support rod 1, and the upper and lower ends of the screen 5 are symmetrically fixed with elastic connecting rods 6.

[0028] The two support beams 2 are arranged horizontally and have a vertically symmetrical structure. The upper and lower support beams 2 are arranged in a vertically symmetrical structure and are connected by hinges.

[0029] The present invention provides a screen projection device for multimedia teaching, which improves the screen projection support connected to the screen 5...

Embodiment 2

[0032] see Figure 4 , 6 , 7, based on Embodiment 1, the difference is that the curtain adjustment mechanism 3 includes a fixed plate 301, the support beam 2 is a rectangular hollow structure, the fixed plate 301 is fixed at the middle position inside the support beam 2, and the right end surface of the fixed plate 301 A chute 302 with opening to the right is fixed, and a slide bar 303 is slidably connected inside the chute 302. The slide bar 303 passes through the support beam 2 forward and extends to its front side and is slidably connected with it. The rear end of the slide bar 303 is fixed with a rotating seat 304, the upper and lower ends of the chute 302 are symmetrically fixed to the front side with fixed rods 305.

[0033] The curtain adjustment mechanism 3 includes a cylinder 306, which is arranged on the right side of the fixed plate 301, the right end of the cylinder 306 vertically runs through the rotating shaft A307, and the rotating shaft A307 extends to the inn...

Embodiment 3

[0038] see Figure 4 , 6 , based on Embodiment 1-2, the difference lies in that the lifting control mechanism 4 includes a threaded rod A401, the front end of the support rod 1 is vertically provided with a rectangular groove 402, and the threaded rod A401 is vertically arranged inside the rectangular groove 402 Realize the rotation connection, the threaded rod A401 is connected with the servo motor 403 at the non-threaded part of the outer end, the sliding seat 404 is slid inside the rectangular groove 402, the threaded rod A401 runs through the sliding seat 404 and is connected to it in rotation, and the front end of the sliding seat 404 is connected with a rotating connection Rod A405, the front end of connecting rod A405 is connected with threaded rod B406, and the two support rods 1 are symmetrically provided with limit grooves A407 on the sides where they are close to each other, and a U-shaped slider 408 is arranged on the front side of one of the The block 408 is rest...

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Abstract

The invention discloses a screen projection device for multimedia teaching, and belongs to the technical field of multimedia teaching equipment. The screen projection device for multimedia teaching comprises a screen projection support and a curtain. The screen projection support comprises supporting rods, supporting beams, a curtain adjusting mechanism and a lifting control mechanism, the screen projection support is defined by the four supporting rods and the two supporting beams, the curtain adjusting mechanism is installed in the supporting beams, the lifting control mechanism is arranged in the supporting rods, and elastic connecting rods are symmetrically fixed to the upper end and the lower end of the curtain. The screen projection support connected with the curtain in a supporting mode is improved, after the curtain and the screen projection support are fixed, automatic winding and unfolding of the curtain can be completed, the elastic connecting rod connected with the curtain is adjusted and controlled according to different states after winding and unfolding, curtain cambered surface imaging is achieved, and the video viewing effect is improved; and the screen projection support and the elastic connecting rod can be detachably placed, and the screen projection support can be folded and stored.

Description

technical field [0001] The invention relates to the technical field of multimedia teaching equipment, in particular to a screen projection device for multimedia teaching. Background technique [0002] Projection screens are used in movies, offices, home theaters, large conferences and other occasions to display images and video files. Divided into many specifications and sizes. Because the screen can be retracted to reduce the space occupied, it is also widely used in multimedia classrooms. In some movies and home theater scenes, the projection screen is always unfolded. In order to increase the viewing effect, the projection screen will be set in a curved surface. structure. [0003] Since the curved projection screen is easy to be folded and damaged when folded and stored, and the unfolding effect is difficult to control, so there is a lack of foldable curved projection screen on the market. Therefore, it is very useful to design a projection screen device for multimedia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B5/02G03B21/58
CPCG09B5/02G03B21/58
Inventor 白宇
Owner HEBEI VOCATIONAL & TECHN COLLEGE OF BUILDING MATERIALS
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