JPH0216159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stage acoustic reflection device used to improve acoustic effects when an orchestra performs on a hall stage.

Conventional acoustic reflectors of this type use a reflector made of corrugated wooden boards, such as plywood, stretched over a frame with a steel frame structure in a predetermined shape.
It is divided into a ceiling reflector that is set on the ceiling, a front reflector that is set to the rear of the front, a left reflector that is set to the left side, and a right reflector that is set to the right side, and these reflectors are separated into set positions and storage positions. was moving to. Therefore, it requires a lot of space when stored, becomes a nuisance during performances other than orchestral performances, such as theatrical performances, and is troublesome to set up and store.

Further, since the shape of the reflecting surface cannot be arbitrarily changed, it is not possible to produce an appropriate acoustic effect depending on the situation.

Therefore, as seen in Japanese Utility Model Application Publication No. 51-57001, stainless steel or aluminum metal plates are foldably connected in a bellows shape to form an acoustic reflecting plate, and this can be installed as is on the floor like a screen or with casters. It can be used by standing up on a stand on a cart, or as in Japanese Utility Model Publication No. 51-40801, a long stainless steel or aluminum thin metal plate is wound into a roll and rolled out and placed on a cart with casters. It has been proposed that the thin metal plate is used by holding the lower end with a clamp and standing it upright so that the thin metal plate is forcibly bent into an arbitrary shape.

However, all of these devices are of the floor-mounted type, and although they are relatively easy to handle, they cannot provide acoustic reflection at a desired height. Furthermore, although the acoustic reflector can be arbitrarily deformed, the acoustic reflector itself maintains its deformed state, so there are problems such as the need for skill to adjust its shape.

The object of the present invention is to be able to be hung from the ceiling or the like and installed at any height, to be easily stored above the stage when not in use, and to have an acoustic reflector in any curved shape that produces optimal acoustic effects. To provide a stage acoustic reflection device that can be easily adjusted.

In order to achieve such an object, the acoustic reflection device of the present invention comprises an acoustic reflection plate made of a flexible plate material such as rubber or soft synthetic resin, and reinforcing rods are attached to both front and rear edges of the acoustic reflection plate. , between the brackets attached to the front and rear reinforcing rods, a plurality of expandable ribs are installed at predetermined intervals, and the least one of the front and rear reinforcing rods is connected to a wire,
The acoustic reflector is suspended from the ceiling of the stage by a chain or the like.

Since the acoustic reflector is flexible, it does not maintain a specific shape by itself, but its front and back edges always maintain the shape that follows the reinforcing rods, and these reinforcing rods are made up of multiple ribs that can be expanded and contracted. Because they are connected, the acoustic reflector automatically curves by expanding and contracting the ribs to adjust its length, drawing a catenary curve whose curvature changes according to the length.
The height and inclination of the acoustic reflector can be adjusted freely using wires, chains, etc., and it can also be pulled up and stored above the stage using wires, chains, etc.

Embodiments of the present invention will be described in detail below based on the drawings.

1 to 4 show a first embodiment of the present invention.
The figure shows a state in which the total acoustic reflector is set, FIG. 2 shows a state in which it is housed, and FIGS. 3 and 4 show a specific support structure for one acoustic reflector.

In FIGS. 3 and 4, the acoustic reflection plate 1 is made of a flexible plate material such as rubber or soft synthetic resin, and can be bent by its own weight. Reinforcing rods 2 made of channel steel or the like are fitted on both front and rear edges of the acoustic reflector 1. For the front and rear reinforcement rods 2,
A plurality of expandable and contractible ribs 3 are installed in parallel at a constant interval from side to side.

That is, each rib 3 is made to be able to expand and contract by fitting the front and rear small diameter pipes 5 on both front and rear sides of the large diameter pipe 4 so as to be slidable in a telescopic manner, and the sliding movement is restricted by a stopper 6. This allows the length between the front and rear ends to be adjusted stepwise or steplessly, and the tips of the front and rear small diameter tubes 5 are
It is pin-joined to front and rear brackets 7 fixed to the front and rear reinforcing rods 2, respectively. A hook 8 is attached to each bracket 7.

On the other hand, ceiling 1 of stage 9 of the hall (Figures 1 and 2)
0, in order to suspend a plurality of acoustic reflectors 1, a plurality of metal pipe suspension rods 11 are horizontally suspended by a plurality of wires 12, respectively. The wire 12 is connected to a winch (not shown) placed on the ceiling 10, and
1 can be raised and lowered automatically.

To set up the acoustic reflector 1, hook the front and rear hooks 8 onto the two front and rear suspension rods 11, suspend the front and rear edges of the acoustic reflection plate 1 from the suspension rods 11, and lift the suspension rods 11. Alternatively, the height and inclination of the acoustic reflector 1 can be adjusted by lowering it. Thus, the acoustic reflector 1
Due to its flexibility, it automatically curves downward to draw a catenary curve, and this curve
It can be changed arbitrarily by expanding or contracting.

As for the acoustic reflector 1 set at the lowest position, only its front edge is suspended from the hanging rod 11, and its rear edge is simply brought into contact with the upper surface of the stage 9.

To store the acoustic reflector 1, remove one of the front and rear hooks 8 from the hanging rod 11, and attach only one side of the acoustic reflector 1 to the hanging rod 11.
The entire suspension rod 11 is raised, and the entire acoustic reflector 1 is suspended from the proscenium arch 1 as shown in FIG.
At a position above 3, the ribs 3 hang flat together with the ribs 3.

Next, in the second embodiment shown in FIG. 5, the relationship between the acoustic reflector 1 and the ribs 3 is the same as in the first embodiment, but the suspension structure of the acoustic reflector 1 is different from that in the first embodiment. differ.

That is, the brackets 7 before and after the acoustic reflector 1
While connecting both ends of the chain 14 to the wire 12, a block 15 is connected to the lower end of the wire 12, and the chain 14 is meshed with a sprocket wheel 16 that is pivotally supported by the block 15. It is suspended from 12. To adjust the inclination of the acoustic reflector 1 in the set state (shown by the solid line in Figure 5), use the chain 14.
In order to change the relative length of the front part (the part in front of the sprocket wheel 16) and the rear part of the acoustic reflector plate 1, and to store the acoustic reflector plate 1, it is lifted in a hanging state as shown by the chain line in the figure.

In the case of the second embodiment, since the load applied to the wire 12 is always constant regardless of the inclination angle of the acoustic reflector 1, the whole can be balanced and suspended in a so-called counterweight type. As a result, it can be moved up and down manually, eliminating the need for a lifting machine such as a winch, which has the advantage of reducing equipment costs.

According to the present invention, there are the following effects.

Since it is of a suspended type that is suspended from the ceiling or the like using wires, chains, etc., it can be installed at any height and inclination, and therefore the acoustic reflection effect can be performed at any arbitrary height and inclination.

By pulling up wires, etc., the acoustic reflector can be stored flat and hanging at the desired position above the stage, making storage work easy and
It also requires less storage space.

By adjusting the length of the multiple expandable ribs installed between the brackets of the reinforcing rods on the front and back edges of the acoustic reflector, the acoustic reflector draws a catenary curve with a curvature that corresponds to the length of the ribs. Since the acoustic reflector is automatically curved, the shape of the acoustic reflector can be adjusted by simply expanding and contracting the ribs, and the curved surface can be easily adjusted to produce the optimal acoustic effect.

The ribs are installed on the brackets of the reinforcing rods, and the acoustic reflector is suspended from a wire or the like by means of the brackets, so that it can be hung stably and without strain in terms of strength.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention.
The figure is an explanatory diagram showing the set state of the total acoustic reflector, Figure 2 is an explanatory diagram showing the stored state, Figures 3 and 4 are an enlarged perspective view and side view of the supporting structure of the acoustic reflector, and Figure 5 is an explanatory diagram showing the set state of the total acoustic reflector. FIG. 2 is a side view showing a second embodiment. 1... Acoustic reflector, 2... Reinforcement rod, 3... Rib, 7...
Bracket, 9...Stage, 10...Ceiling, 12...Wire, 14...Chain.

Claims (1)

[Claims] 1. The acoustic reflector 1 is made of a flexible board material such as rubber or soft synthetic resin, and reinforcing rods 2 are attached to both front and rear edges of the acoustic reflector 1.
A plurality of expandable ribs 3 are installed at predetermined intervals between the brackets 7 attached to the brackets 7, and at least one of the brackets 7 of the front and rear reinforcing rods 2 is suspended with a wire, chain, etc. to reflect sound. A sound reflection device for a stage, characterized in that a board 1 is suspended from the ceiling of the stage, etc.