JPH0566641U - Folding screen box - Google Patents

Abstract

(57) [Abstract] [Purpose] By making the screen box foldable, it is possible to provide a magnified image of the required size in its expanded state, while especially in its folded state, Improves the storage and transportability of the screen box. A screen box that can be attached to and detached from a projector, and includes a box-shaped structure 10, a screen frame member 13 to which a transmissive screen 11 is attached, and both ends of the box frame structure 13 and a base frame 9, respectively. Supported by
At least two connecting members 14a and 14b for connecting the screen frame member 13 to the base frame 9 and allowing the screen frame member 13 to swing in the vertical direction with respect to the base frame 9, and an intermediate portion of each connecting member. A hinge portion 15c which is provided on the upper end of the base frame and a lower end of the screen frame member which is pivotally supported at one end to the upper part of the base frame and which is swingable in the vertical direction. It consists of 25 and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a folding screen box suitable for being applied to an overhead projector and other projectors.

[0002]

[Prior Art]

 A well-known screen box of this type is, for example, one in which a transparent screen is arranged in front of a vertical box-like structure having side walls, and the box-like structure can be attached to and detached from a predetermined position of a projector. There is. When such a screen box is applied to, for example, an overhead projector, the projection light that reaches the screen box from the projection lens of the projector through the reflecting mirror provided there is used in the box when it is used. It serves to clearly form an image on the transmission screen via at least one reflecting mirror provided.

[0003]

[Problems to be solved by the device]

 By the way, in the case of such a conventional screen box, in addition to the size of the transmissive screen and hence the volume of the box-shaped structure being considerably large in order to enlarge the image to a sufficient size, the box-shaped structure is Due to the solid structure, the screen box is extremely bulky when not in use, and the space occupied by the screen box is extremely large when it is stored or stored, and it is also inconvenient to carry. ..

The present invention advantageously solves the above-mentioned problems of the prior art, and it is possible to enlarge and project an image to a sufficient size, and still further reduce the occupied space when not in use for storage and storage. The purpose is to provide a folding screen box that is extremely easy to transport.

[0005]

The folding screen box according to the present invention is particularly configured to connect at least two screen frame members having a transparent screen and a base frame, both ends of which are pivotally supported. A hinge part that is connected to each other by members so that the screen frame members can be vertically swung with respect to the base frame and that the connecting members are allowed to bend in the middle part of each of the connecting members. Further, a box-like structure is formed by pivotally supporting a support rod on the upper portion of the base frame and the lower portion of the screen frame member, and allowing the support rod to swing in the vertical direction. Is what you do.

[0006]

[Action]

 According to this folding screen box, when it is used, the transmissive screen is separated by a certain distance from the base frame by the action of the connecting member under the condition that the base frame is attached to the projector. When the screen box is not used, the connecting members of the screen box are moved inward in any direction, for example, in the up / down direction or the left / right direction, based on the action of both end pivots and hinges. Folding can bring the screen frame member closer to the base frame, and when the transmissive screen is brought very close to the base frame, the front-back dimension of the screen box itself, or in other words, the thickness, becomes small enough. The base frame from the projector, saving the It is possible to reduce the pace of, along with the storage property is good, even strokes have come in handy.

Moreover, in this screen box, when the box-shaped structure is folded as described above, it is based on the swinging motion of the support rod, particularly downward, under the action of each connecting member. As the screen frame member approaches the base frame, the relative height of the screen frame member with respect to the base frame gradually decreases.Therefore, even when the length of the base frame is reduced, when the box-like structure finishes folding. In this case, it is possible to effectively prevent the screen frame member from projecting above the base frame, and therefore, the vertical dimension of the screen box when it is not used can be made sufficiently small. it can.

[0008]

【Example】

 The invention will be described below based on illustrated examples. FIG. 1 is a perspective view showing an application example of the present invention, in which 1 is an overhead projector and 2 is a folding screen box detachably attached to this projector.

In the overhead projector 1 of this example, the upper surface of the projector body 3 having a substantially box shape is closed by a light-transmitting diffuser plate 4, and the projector body 3 is projected from above into the light-transmitting diffuser plate 4. A condenser lens 6a is provided, and a projection lens 6b is attached to a position directly above the condenser lens of the arm member 5 whose base is fixed to the projector main body 3 and protrudes onto the translucent diffuser plate. A reflecting mirror 7 which is located above and reflects the projection light rays passing therethrough toward the reflecting mirror in the screen box, which will be described later, can also be repositioned in the arm member 5, for example, in the vertical direction. Further, a subject mounting frame 8 is provided on the translucent diffuser plate 4 for moving in a two-dimensional direction to enable selection of a subject image, for example, a film image. It becomes.

The screen box 2 of this example attached to such an overhead projector 1 has a horizontal cross section of a base frame 9 having a substantially channel shape, as is apparent from the partial side view of FIG. A box-like structure 10, which will be described in detail later, is attached to the upper part, and a reflecting mirror 12 is fixed to the base frame 9 at a position facing the back surface of the transmission screen 11 located in front of the box-like structure 10. ..

Here, the box-shaped structure 10 can be configured as follows. For example, as shown in FIG. 3 as a skeleton perspective view, the transmissive screen 11 is fitted and fixed to a screen frame member 13 having a square front shape, and at least two, four in the illustrated example, to the screen frame member 13. One end of each of the connecting members 14a to 14d is rotatably supported in a substantially horizontal plane, and the other end of each of the connecting members 14a to 14d is similarly pivoted to the base frame 9. By supporting, the screen frame member 13 and the base frame 9 are interconnected. Here, each of the connecting members can be configured, for example, by connecting the two levers 15a and 15b by a pin 15c so as to be relatively rotatable in a substantially horizontal plane. Preferably, it has an over-center spring 16 for self-holding its bending and extension postures.

Further, in this box-shaped structure 10, as shown in FIG. 3, by attaching hinges 23a to 23d to both ends of each connecting member 14a to 14d, the screen frame member 13 is attached to the base frame 9. While swinging in the vertical direction, the upper end of the base frame 9 and the lower end of the screen frame member 13 are effectively restrained by the supporting rods 25 pivotally supporting the end portions of the hinges 23a to 23d. As a result, in the extended state of the connecting members 14a to 14d, the screen frame member 13 and thus the transmissive screen 11 are positioned obliquely above the base frame 9 under the action of the support rod 25. When the connecting members 14a to 14d are bent, the screen frame member 13 bends from the upper end of the base frame 9 according to the length of the supporting rod 25 in a bent state. It makes it possible to retain in rotation posture obliquely downward in diameter.

Further, in the illustrated example, as shown in FIGS. 1 and 2, one end portion of the light shielding film body 17 formed of a flexible material and having a substantially rectangular tube shape as a whole is covered with a screen frame portion over the entire circumference thereof. The light-shielding film body 17 is extended from the screen frame member 13 to the base frame 9 by connecting the other end to the base frame 9 over the entire circumference while being connected to the material 13, and then the reflecting mirror 12 is added. And the connection members 14a to 14d are included.

The light-shielding film body 17 here guides the projection light beam reflected by the reflecting mirror 7 of the projector to the reflecting mirror 12 in the box-shaped structure 10 at a portion corresponding to the bottom surface of the box-shaped structure 10. It has an opening 18 for.

The screen box 2 including the box-shaped structure 10 configured as described above has a hugging hook member provided at the lower end of the base frame 9 at a position where the reflecting mirror 12 faces the reflecting mirror 7 of the projector 1. The screen box 2 is attached to the lower end of the base frame 9 by fitting 19 to the rising base 20 of the arm member 5 provided in the projector main body 3 as shown in FIG. By screwing a screw member 21 attached to the portion, and preferably prevented from coming off from the screw member, into a screw hole 22 provided in the projector main body 3, the screw member 21 is detachably fixed to the projector 1.

In such a screen box 2, before or after it is attached to the projector, the connecting members 14a to 14d are extended as shown by solid lines in FIGS. 2 and 3, and the position of the reflecting mirror 7 is adjusted. After the adjustment, the subject image is projected on the transmissive screen 11 through the opening 18 of the light shielding film body 17 and the reflecting mirror 12, whereby a clear enlarged image can be displayed on the transmissive screen 11.

When the screen box 2 is not used, the intermediate parts of the connecting members 14a to 14d are bent inward in the horizontal direction in this example, so that the screen box 2 has a transmissive screen 11 as shown in FIG. The screen frame member 13 is brought into close proximity to the base frame 9, and along with this, the light shielding film body 17 in the expanded state is folded as shown in FIG. Can be sufficiently close to the base frame 9 while leaving the intervening space of the connecting members 14a to 14d. As a result, the size of the screen box 2 in the front-rear direction is extremely small, so that the occupied space at the time of storage is Will be significantly reduced. Further, if the handle 24 is provided on the upper end surface of the base frame 9, the portability can be further improved.

Moreover, here, the respective connecting members 14 a to 14 d are connected to the base frame 9 and the screen frame member 13 via the respective hinges 23 a to 23 d, and both of them are also connected to each other by the support rod 25. Since they are connected, it is possible to position the upper edge of the screen frame member 13 having a large front dimension below the upper edge of the base frame 9 when the screen box 2 is particularly folded. Therefore, the vertical dimension of the screen box 2 is sufficiently smaller than the case where the screen box 2 is folded only by the bending displacement of the connecting members 14a to 14d without providing the hinges 23a to 23d and the support rod 25. be able to.

Although the invention has been described above based on the illustrated example, the invention is not limited to the illustrated example, but can be variously modified as required. For example, although the connecting member 14 is bent in the horizontal direction in the illustrated example, it may be bent in the vertical direction, and this screen box is used in a room where the ambient illuminance is relatively low. In this case, a sufficiently sharp projected image can be obtained without providing a light shielding film.

FIG. 6 is a view showing another embodiment of the present invention, in which the screen box is provided with flexibility in the vicinity of the screen frame member 13 instead of the light shielding film body 17 of the above-mentioned example. According to this example, the shading plates 26 that are not included are hinged.When the connecting members 14a to 14d are bent, the shading plates 26 are superposed on the front surface side of the transmissive screen 11 to form a screen box. 2 can be sufficiently miniaturized, and when the connecting members 14a to 14d are extended, the respective shading plates 26 superposed on the front surface side of the transmissive screen 11 are shown in FIG. 6 (b). Similar to the screen of the previous example, by pushing and expanding it into a box shape as shown by the line, and keeping each shading plate 26 in the spreading state by known hooking means, fasteners, surface fasteners, etc. Therefore, it is possible to contribute to the projection of a clear image.

[0021]

[Effect of the device]

 Therefore, according to the present invention, by making the screen box foldable, it is possible to provide a magnified image of a required size in the expanded state, and in particular, in the folded state, The storability and transportability of the screen box can be significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an application example of a folding screen box according to the present invention.

FIG. 2 is a partial cross-sectional side view of FIG.

FIG. 3 is a frame perspective view showing an extended state of the screen box.

FIG. 4 is a perspective view showing a folded state of the screen box.

FIG. 5 is a perspective view showing a folded state of the screen box.

FIG. 6 is a view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Overhead type projector 2 Screen box 6b Projection lens 7 Reflector 9 Base frame 11 Transmission screen 12 Reflector 13 Screen frame member 14a-14d Connecting member 15a, 15b Lever 15c Pin 23a-23d Hinge 25 Support rod

Claims (1)

[Scope of utility model registration request] 1. A base frame that is attachable to and detachable from a projector, a box-shaped structure that is attached to an upper portion of the base frame and has a transparent screen in a front surface, and is provided in the base frame and faces a back surface of the transparent screen. In a screen box having a reflecting mirror positioned as a screen frame member, the box-like structure is a screen frame member having a transmissive screen attached, and both ends are pivotally supported by the screen frame member and the base frame, respectively. While connecting the members to the base frame, at least two connecting members that allow the screen frame member to swing in the vertical direction with respect to the base frame, and the bending of the connecting members provided in the intermediate portion of each connecting member. Allowable hinges, one end on top of the base frame and the other end of the screen frame member. Are pivotally supported respectively in part, fold-down screen box characterized by being constituted by a rockable support rod in the vertical direction.