The changeable combination curtain of trigonometric expression
Technical field
The present invention relates to a kind of annex of showing usefulness, be specifically related to a kind of projection screen for projector.
Background technology
At present, home theater technology take projector as main body and the development of product are day by day prosperous, utilize the projection arrangements such as slide projector, elevated projecting, liquid crystal projection apparatus with image projection on projection screen, image is amplified demonstration, can be used as the usefulness of demonstration, publicity, teaching.As the annex of projection arrangement, projection screen is usually just as single imaging tool.So, although projector is day by day welcomed by the people, also do not replace the main flow that TV becomes family's parlor ornaments.
In the prior art, the structure of common electric projecting curtain comprises housing, is arranged at an interior rotating shaft of housing, is wound on the curtain in the rotating shaft, the trombone slide that is fixed in the curtain bottom and drive unit, described housing bottom has the curtain outlet, and common drive unit is the coaxial motor that is arranged in rotating shaft one end.Common projection screen comprises stent-type curtain, hand curtain and electrodynamic type curtain on the market now, these curtain devices or take valuable space, parlor, incompatible with the decorative environment of family, seem more rude, all exist to the weakness of family's parlor electrical equipment mainstream development, this also is that part has the family of ability to shoulder economically not select one of reason of projector's home theater.And the projection screen of said structure only has single white background curtain, can't satisfy the more and more higher esthetic requirement of people.
Summary of the invention
Goal of the invention: the object of the invention is to overcome the deficiency of above-mentioned prior art, a kind of changeable combination curtain of trigonometric expression that is integrated in conjunction with projection and decoration function is provided.
Technical scheme: in order to solve the problems of the technologies described above, the changeable combination curtain of trigonometric expression of the present invention, it comprises the curtain frame, is located at the trigonometric expression curtain in this curtain frame, places the roller bearing in this trigonometric expression curtain, and the keeper that is located at these roller bearing two ends.
Described trigonometric expression curtain is comprised of triangular prism curtain piece.
Described triangular prism curtain piece simultaneously is white curtain, and all the other two sides are pattern curtains.
Described roller bearing rotates by driving-belt, and this driving-belt is connected with speed change gear.
Described trigonometric expression curtain rotates 120 degree by described roller bearing at every turn.
Described triangular prism curtain piece always has one side parallel with described curtain frame.
The present invention can make the curtain frame and the picture frame pattern of interior decoration style in one, the trigonometric expression curtain, keeper, driving-belt and speed change gear all are hidden in the curtain frame, by driving-belt the roller bearing on drive unit and the keeper is coupled together, running by roller bearing, drive each rotation 120 degree of curtain, just can freely switch curtain and decorative picture, when not using projection screen, can be according to interior decoration style and tone, curtain is freely switched to the pattern of arranging in pairs or groups mutually with indoor environment, give a complete indoor environment, also can be according to the difference hobby of different times, freely switch at any time, play a good decorative effect.
Beneficial effect: the present invention compared with prior art, its remarkable advantage is: this device is because the form that whole curtain frame is a picture frame, can be according to different decoration styles and tone, picture in the picture frame is carried out free switching, satisfy the demands, in order to give at any time the indoor well decoration effect that plays, allow the people can be when not using projection screen, also can see the picture of a width of cloth beauty, rather than as before, only see the projection screen of a slice white, thereby also reduced people's visual fatigue, give a kind of pure and fresh sensation of people.
Description of drawings
Fig. 1 is that local master of the present invention attempts;
Fig. 2 is the vertical view of Fig. 1.
Wherein:
1, curtain frame; 2, trigonometric expression curtain; 3, roller bearing; 4, keeper; 5, triangular prism curtain piece; 6, white curtain; 7, pattern curtain; 8, driving-belt; 9, speed change gear
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As depicted in figs. 1 and 2, the changeable combination curtain of trigonometric expression of the present invention, it comprises curtain frame 1, is located at the trigonometric expression curtain 2 in this curtain frame 1, places the roller bearing 3 in this trigonometric expression curtain 2, and the keeper 4 that is located at these roller bearing 3 two ends; Described trigonometric expression curtain 2 is comprised of triangular prism curtain piece 5; Described triangular prism curtain piece 5 one sides are white curtains 6, and all the other two sides are pattern curtains 7; Described roller bearing 3 rotates by driving-belt 8, and this driving-belt 8 is connected with speed change gear 9; Described trigonometric expression curtain 2 rotates 120 degree by described roller bearing 3 at every turn; Described triangular prism curtain piece 5 always has one side parallel with described curtain frame 1; This device also can adopt manually.The present invention is because the form that whole curtain frame is a picture frame, can be according to different decoration styles and tone, picture in the picture frame is carried out free switching, satisfy the demands, in order to give at any time the indoor well decoration effect that plays, allow the people can be when not using projection screen, also can see the picture of a width of cloth beauty, rather than as before, only see the projection screen of a slice white, thereby also reduced people's visual fatigue, given a kind of pure and fresh sensation of people.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.