TWI384317B - Projection screen mechanism - Google Patents

Description

Projection screen mechanism

The present invention relates to a projection screen mechanism, and more particularly to a projection screen mechanism in which a projection screen can be horizontally opened.

Today's optical projectors, such as single beam projectors and liquid crystal projectors, have been able to project images of high image quality and high brightness. In addition, the optical projection device has the advantage of being similar to the price of a conventional television set, and being small in size and convenient to carry. Therefore, optical projection devices are gradually being used by the general public.

In large-scale presentations, the optical projection device projects the image onto a projection screen to facilitate viewers to view the information on the projection screen. In the prior art, the projection screen and a scrolling unit together form a projection screen mechanism. One side of the projection screen is connected to one of the reel units of the scrolling unit, and the projection screen is wound around the reel to expose the other side of the projection screen. When the user wants to use the projection screen, the user pulls the exposed side of the projection screen such that the projection screen gradually protrudes, and one of the scrolling units is connected to the torsional spring of the reel to be elastically deformed. Next, the user secures the exposed side of the projection screen for the optical projection device to project an image.

When the user wants to put away the projection screen, the user releases the fixed state of the projection screen, and the restoring force of the torsion spring will drive the reel to rotate and wind the projection screen. However, the projection screen of the projection screen mechanism of the prior art is upright, that is, the surface on which the projection screen is projected is substantially parallel to the direction of gravity, so the application of the projection screen mechanism of the prior art has its limitations.

The invention provides a projection screen mechanism, the surface on which the projection screen is projected can be perpendicular to the direction of gravity.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a projection screen mechanism including a base, a projection screen, and at least one chain. The projection screen has one of a first end and a second end opposite to each other. The first end is connected to the base. The chain is connected to the base and has a plurality of sequentially connected chain nodes.

When the chain is unfolded, the link at the foremost end of the chain adjacent to the base is engaged with the base and abuts against the base. At this time, the remaining links are engaged with the previous link and abut against the previous link, and the second end of the projection screen is disposed at the last link of the chain relative to the foremost end, so that the projection screen can be opened. open.

In an embodiment of the invention, each of the links has a body, a block portion, a first hook and a second hook. The body has one of a third end and a fourth end opposite to each other. The first hook is disposed at the third end, the second hook is disposed at the fourth end, and the abutting portion is disposed at the third end.

When the chain is unfolded, the first hook of the link at the foremost end of the chain is engaged with the base, and the abutment of the link at the foremost end of the chain abuts against the base. At this time, the first hook of each of the other links outside the chain link at the foremost end of the chain is engaged with the second hook of the previous link, and the remaining links outside the chain link at the foremost end of the chain The abutment abuts against the previous link, and the second end of the projection screen is engaged with the second hook of the link at the extreme end of the chain.

In an embodiment of the invention, the base includes a base body and a reel. The reel is disposed on the base body, and the first end of the projection screen is connected to the reel.

When the chain is unfolded, the chain link at the foremost end of the chain is engaged with the base and abuts against the base, and the remaining links are engaged with the previous link and abut against the previous link, and the second end of the projection screen It is placed at the end of the chain to open the projection screen. Therefore, when the chain is unfolded, the chain is horizontally supported so that the projection screen can be horizontally opened.

The above and other objects, features and advantages of the embodiments of the present invention will become more <RTIgt;

The foregoing and other technical aspects, features, and advantages of the present invention will be apparent from the Detailed Description of the <RTIgt; The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

[First Embodiment]

1A is a perspective view of a projection screen mechanism according to a first embodiment of the present invention. FIG. 1B is another perspective view of the projection screen mechanism of the first embodiment of the present invention. 2A is a partially enlarged schematic view of the projection screen mechanism of FIG. 1B. FIG. 2B is an enlarged schematic view showing another part of the projection screen mechanism of FIG. 1B. Referring to FIG. 1A, FIG. 1B, FIG. 2A and FIG. 2B, the projection screen mechanism 200 of the present embodiment includes a fixed base 210, a projection screen 220 and at least one chain 230 (two are schematically shown in FIG. 1A). In the present embodiment, the fixed base 210 includes a body 212 and a reel 214. The base 212 is fixed to a wall surface (not shown), for example, and the reel 214 is disposed on the base 212. The spool 214 is adapted to rotate about an axis A1. In another embodiment, the fixed base 210 further includes a torsion spring (not shown), one end of the torsion spring is connected to the reel, and the other end of the torsion spring is connected to the base 212.

The projection screen 220 has a first end 222 and a second end 224 opposite to each other. The first end 222 of the projection screen 220 is coupled to the reel 214 of the fixed base 210. Each chain 230 is coupled to the seat 212 of the fixed base 210 and has a plurality of sequentially connected links 232.

3 is a perspective view showing one of the links of FIG. 1B. Referring to FIG. 3, in the embodiment, each link 232 has a body 232a, an abutting portion 232b, a first hook 232c and a second hook 232d. The body 232a has a third end E3 and a fourth end E4 opposite to each other. The first hook 232c is disposed at the third end E3 of the body 232a, the second hook 232d is disposed at the fourth end E4 of the body 232a, and the abutting portion 232b is disposed at the third end E3 of the body 232a.

Referring to FIG. 1A , FIG. 1B , FIG. 2A , FIG. 2B and FIG. 3 , when the chains 230 are unfolded, the links 232 of the respective chains 230 adjacent to the foremost end of the fixed base 210 are engaged with the fixed base 210 and fixed against the fixing. Base 210. At this time, with respect to each chain 230, the remaining links 232 outside the chain link 232 at the foremost end of the chain are engaged with the previous link 232 and abut against the previous link 232, and the second of the projection screen 220 The end 224 is disposed at a link 232 located at the extreme end of the chain relative to the foremost end to allow the projection screen 220 to be opened.

In detail, in the embodiment, when the chains 230 are unfolded, the first hooks 232c of the frontmost links 232 of the respective chains 230 are engaged with the base 212 of the fixed base 210, and the respective chains 230 are The abutting portion 232b of the foremost link 232 abuts against the seat 212 of the fixed base. At this time, with respect to each chain 230, the first hook 232c of each of the other links 232 outside the link 232 at the foremost end of the chain is engaged with the second hook 232d of the previous link 232, which is located in the chain. The abutting portion 232b of the remaining links 232 outside the frontmost link 232 abuts against the previous link 232, and the second end 224 of the projection screen 220 is adapted to be engaged with the link 232 at the extreme end of the chain. The second hook 232d.

Based on the above, when the chains 230 are unfolded, the chains 230 are horizontally supported to allow the projection screen to be horizontally opened.

When the user wants to retract the projection screen 220, the user can release the fixed state between the second end 224 of the projection screen 220 and the last link 232 of each chain 230, and the projection screen 220 is rotated by the reel 214. Volume collection. At this time, the user can wind each chain 230 in the rotation direction R1 shown in FIG. 1B.

It should be noted that in another embodiment, the fixed base 210 may omit the configuration reel 214 and the first end 222 of the projection screen 220 is coupled to the base 212. In this embodiment, when the user wants to retract the projection screen 220, the user does not need to release the fixed state between the second end 224 of the projection screen 220 and the last link 232 of each chain 230, but Each of the chains 230 and the projection screen 220 are wound together in accordance with the rotational direction R1 shown in FIG. 1B.

[Second embodiment]

4 is a perspective view of a chain according to a second embodiment of the present invention. Referring to FIG. 4, the chain 330 of the present embodiment can replace the chain 230 of the first embodiment. Each link 332 of the chain 330 of the embodiment has a body 332a, an abutting portion 332b, a first hook 332c and a second card. Hook 332d.

The chain 330 of the present embodiment is different from the chain of the first embodiment in that the respective links 332 of the chain 330 of the present embodiment are different from the respective links 232 of the chain 230 of the first embodiment (see FIG. 3) The appearance.

In summary, the projection screen mechanism of the embodiment of the present invention has at least one of the following or other advantages. When the chain is unfolded, the chain link at the foremost end of the chain is engaged with the fixed base and abuts against the fixed base, and the remaining links are engaged with the previous link and abut against the previous link, and the projection screen The two ends are arranged at the end of the chain to open the projection screen. Therefore, when the chain is unfolded, the chain is horizontally supported so that the projection screen can be horizontally opened.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope is subject to the definition of the scope of the patent application attached. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

200. . . Projection screen mechanism

210. . . Pedestal

212. . . Seat

214. . . reel

220. . . Projection Screen

222. . . First end

224. . . Second end

230, 330. . . Chain

232, 332. . . Chain link

232a, 332a. . . Ontology

232b, 332b. . . Abutment

232c, 332c. . . First hook

232d, 332d. . . Second hook

A1. . . Axis

E3. . . Third end

E4. . . Fourth end

R1. . . Direction of rotation

1A is a perspective view of a projection screen mechanism according to a first embodiment of the present invention.

FIG. 1B is another perspective view of the projection screen mechanism of the first embodiment of the present invention.

2A is a partially enlarged schematic view of the projection screen mechanism of FIG. 1B.

FIG. 2B is an enlarged schematic view showing another part of the projection screen mechanism of FIG. 1B.

3 is a perspective view showing one of the links of FIG. 1B.

4 is a perspective view of a chain according to a second embodiment of the present invention.

200. . . Projection screen mechanism

210. . . Pedestal

212. . . Seat

214. . . reel

220. . . Projection Screen

224. . . Second end

230. . . Chain

232. . . Chain link

R1. . . Direction of rotation

Claims (3)

A projection screen mechanism comprising: a base; a projection screen having a first end and a second end opposite to each other, wherein the first end is coupled to the base; and at least one chain connected to the base And having a plurality of sequentially connected links; when the chain is unfolded, the link adjacent to the base at the foremost end of the chain is engaged with the base and abuts the base, and the remaining links are The first one of the links is engaged with the previous one, and the second end is disposed at the end of the chain opposite the foremost end, so that the projection screen is opened. The projection screen mechanism of claim 1, wherein each of the links has a body, an abutting portion, a first hook and a second hook, the body having one third end opposite to each other And a fourth end, the first hook is disposed at the third end, the second hook is disposed at the fourth end, and the abutting portion is disposed at the third end; when the chain is deployed, the The first hook of the link at the foremost end of the chain is engaged with the base, and the abutting portion of the link at the foremost end of the chain abuts the base at the foremost end of the chain The first hook of each of the other links outside the link is engaged with the second hook of the previous link, and the other of the links outside the link at the foremost end of the chain The abutment abuts the previous one of the links, and the second end of the projection screen is adapted to be engaged with the second hook of the link at the extreme end of the chain. The projection screen mechanism of claim 1, wherein the base comprises a body and a reel, the reel is disposed on the base, and the first end of the projection screen is coupled to the reel.