JPS62131694A - Speaker cabinet - Google Patents

Abstract

PURPOSE:To improve the acoustic reproduction characteristics of a speaker due to vibration of a cabinet by laminating thin wooden sheets impregnated with a thermosetting resin and applying hot press to the sheets to form a reinforced laminated wooden plate for a bubble plate constituting at least the speaker cabinet. CONSTITUTION:The buffle plate constituting the speaker cabinet is formed by the reinforced laminated wooden plate by applying lamination and hot press to the thin wooden sheets impregnated with the thermosetting resin. For example, a birch plate of 1-4mm thickness is impregnated with a phenolic resin, the required number of the sheets is laminated and subjected to hot pressing to form the reinforced laminated wooden plate of nearly 1.5mm thickness and nearly 1.5 in specific gravity. Then the cabinet of an outer dimension of nearly 280mmWX446mmHX232mmD is made, or the front face buffle plate mounted with a speaker only is made of the said reinforced laminated wooden plate and conventional particle boards are used for other plate faces. In the cabinet obtained in this way, the vibration of each plate face is damped very quickly, the plate face vibration suppressing effect is obtained and the amplitude of the vibration of each plate face is reduced.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to improvements in speaker cabinets.

[Prior Art] Conventionally, solid wood, particle board, synthetic resin molded products, metal materials, etc. have been used as speaker cabinet materials.

[Problems to be solved by the invention] The above-mentioned conventional materials have various problems. For example, solid wood is extremely expensive, and synthetic resin molded products do not have sufficient rigidity and are not suitable for large cabinets. Currently, most cabinets are made of particle board, as metal materials are expensive and have extremely low internal loss, resulting in poor acoustic characteristics.

However, the particle board has a specific gravity of 0 at most.
．． Since it is about 6 to 0.7, it is easy to vibrate due to the internal pressure of the cabinet, and the radiated sound due to the cabinet vibration has a disadvantage that it adversely affects the sound reproduced from the speaker.

[Means for Solving the Problem] The present invention provides a speaker cabinet in which the speaker cabinet, or at least the baffle plate constituting the speaker cabinet, is made of a reinforced laminated wood board obtained by laminating and heat pressing thin wood boards impregnated with a thermosetting resin. I'll go.

[Example] A single piece of birch with a thickness of 1 to 4 mm was impregnated with phenolic resin,
Thickness 12m formed by laminating the required number of sheets and hot pressing.
, External size 280W made of reinforced laminated wood board with specific gravity 1.5
An X 4 /1.6st-I X 232 cocoon cabinet (first example) was produced.

As another embodiment, a cabinet with the same shape but only the front baffle plate to which the speaker is attached is made of the reinforced laminated wood board of the present invention, and the other board surfaces are made of conventional particle board (a second embodiment) ) was created.

[Effects of the invention] Furthermore, cabinets of the same size and shape with the board surfaces made of conventional particle board were manufactured, and speakers with a diameter of 20 cm were attached to each cabinet, and when the speakers were driven by pulse signals, the board surface The vibrations were measured and the results shown in Figures 1-a to 1-d were obtained.

However, Figure 1-a shows the speaker frame, Figure 1-b shows the baffle plate surface near the speaker frame, Figure 1-0 shows the center of the cabinet side plate, and Figure 1-d shows the surface of the cabinet back plate. In each figure, 1
2 is the vibration damping characteristic of the cabinet of the first embodiment of the present invention, 2 is the cabinet of the second embodiment of the present invention, and 3 is the vibration damping characteristic of the conventional cabinet.

As is clear from the figure, in the cabinet according to the embodiment of the present invention, the vibration of each plate surface is extremely quickly attenuated, and the effect of suppressing the vibration of each plate surface according to the present invention is obtained. The amplitude could also be reduced, and the effects of this invention could be maximized.

[Brief explanation of drawings]

Figures 1-a to 1-d are vibration damping characteristic diagrams of the cabinet according to the embodiment of the present invention and the conventional cabinet, respectively.

Claims (1)

[Claims] A speaker cabinet characterized in that at least a baffle plate constituting the speaker cabinet is made of a reinforced laminated wood board made by laminating and heat pressing thin wood boards impregnated with a thermosetting resin.