JPH0339997Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a speaker cabinet.

[Conventional technology]

Conventionally, methods have been put into practical use to increase the mechanical strength of the box itself by attaching reinforcing crosspieces and reinforcing rods to the cabinet, and to disperse and damp the plate vibrations of the full plate, side plates, and back plate. , for the purpose of damping plate vibration of a full plate, for example, Utility Model Application No. 58-147376
There is a publication.

The device described in the same publication has a narrow groove in the board thickness direction around the speaker unit of the full board.
It has a structure in which this groove is filled with a viscoelastic material such as rubber.

[Problem that the invention attempts to solve]

One of the causes of plate vibration of the baffle plate is due to the reaction of the speaker unit, but since the conventional structure is such that grooves are provided in the buffle plate, the mechanical strength of the buffle plate is reduced. Therefore, the buffer plate, which serves as a reference for the sound source (speaker unit), vibrates and radiates sound more easily, so the sound from the buffer plate is superimposed on the sound from the speaker unit, and the response characteristics of the system are affected. There were problems that led to deterioration of transient characteristics and distortion characteristics.

In order to solve these problems, the inventors proposed, for example, the following structure. (Utility Application No. 60-001967) To explain with reference to FIG. 6, at the joint between the buff-full plate 1 and the side plate 2 of the cabinet, there is a slit-like shape that is approximately parallel to the surface of the buff-full plate 1 over the entire circumference of the side plate 2. It has a structure in which grooves 4 are provided.

In this improved structure, the speaker unit 5 passes through the baffle plate 1 to the side plate 2 and back plate 3.
The vibrations propagating to the side plate 2 and the back plate 3 are attenuated by the slit-like groove 4 portions (oscillologically speaking, the characteristic impedance of that portion changes by changing the cross-sectional area of the medium). The vibration of the plate is reduced.

However, such an improved structure
Since the side plate of the cabinet has a structure in which slit-like grooves are provided around the entire circumference, apart from the effect of reducing plate vibration, the mechanical strength of the cabinet is reduced.
There was room for improvement in this respect.

The present invention aims to solve these problems.

[Means for solving problems]

The present invention cuts the end of the substrate to provide an inclined end surface to be joined to the baffle plate, and also provides a slit-like groove of a predetermined depth from the back side of the substrate parallel to the inclined end surface. A V-shaped groove is provided on the surface of the substrate in a direction perpendicular to the slit-shaped groove to form the parts that will become the top plate, left and right side plates, and bottom plate of the cabinet, and the slits are formed in the parts that are to become the left and right side plates. A first reinforcing member having a triangular cross section is attached along the V-shaped groove, and the board is successively bent inward using the V-shaped groove as a bending part to form a top plate, left and right side plates, and a bottom plate. Attaching a second reinforcing member having a triangular cross section along the inclined end surface to be joined to the inclined end surfaces of the portions that are to become the left and right side plates of the buttful plate provided with the inclined end surfaces,
Joining the inclined end surfaces of the vertical plate and the sloped end surfaces of the top plate, left and right side plates, and bottom plate without bringing the second reinforcing member of the vertical plate into contact with the first reinforcing member of the left and right side plates. The present invention is characterized in that third reinforcing members each having a square cross section are attached to the joint portions of the buff-full plate, the top plate, and the side plates so as to face each other.

[Effect]

According to the above configuration, (a) the attachment of the first reinforcing member to the left and right side plates and the formation of the slit-like grooves are performed before the board is bent to form a cabinet structure, that is, with the board unfolded; (b) The substrate can then be bent and configured into a cabinet structure. (c) The full board and the above top board,
The third reinforcing member can be attached to the joint with the side plate with good workability in the same manner as in the past.

〔Example〕

This will be explained with reference to FIG. 1 and the following drawings.

6 is a rectangular substrate, one end in the longitudinal direction is cut at a 45 degree angle to form an inclined end surface 12;
Furthermore, a slit-like groove 13 is formed on the back surface of the substrate 6, parallel to the inclined end surface 12, and having a depth that leaves the surface portion of the substrate 6 intact.

V-shaped grooves 14, 14, 14 are formed on the back surface of the substrate 6 at a predetermined interval, perpendicular to the slit-shaped groove 13, and have a depth of 90 degrees leaving the surface portion of the substrate 6, and Both ends of the substrate 6 are also cut at an angle of 45 degrees. The V-shaped grooves 14, 14, 14 divide the substrate 6 into portions that are to become the top plate 8, left and right side plates 9, 10, and bottom plate 11 of the cabinet.

Then, first reinforcing members 7, 7 having a triangular cross section are pasted along the slit-shaped groove 13 on the back surface of the portions of the substrate 6 that are to become the left and right side plates 9, 10. On the other hand, the circumference of the full plate 15 is 45
Slanted end surfaces 16, 16 cut at a degree angle are formed, and along the inclined end surfaces 16, 16, which are to be joined to the portions that will become the left and right side plates 9, 10 of the substrate 6, a triangular cross section is formed. The second reinforcing members 17, 17 are respectively pasted.

The substrate 6 is sequentially bent inward using the V-shaped grooves 14, 14, 14 as bent portions, and the V-shaped grooves 14, 1 are bent inward.
The opposing cut surfaces of the cabinets 4 and 14 are joined to form a top plate 8, left and right side plates 9 and 10, and a bottom plate 11 of the cabinet.

Inclined end surface 16, 1 around the above-mentioned buttful plate 15
6 and the above top plate 8, left and right side plates 9, 10, and bottom plate 1
1 and the inclined end surface 12 of the bent full plate 1.
The second reinforcing members 17, 17 of No. 5 and the first reinforcing members 7, 7 of the left and right side plates 9, 10 are opposed to each other at a predetermined interval without contacting each other.

Thereafter, third reinforcing members 18, 18 each having a square cross section are attached to the joints between the top plate 8, the bottom plate 11, and the buttful plate 15, respectively.

In this embodiment, the first and third reinforcing members 7, 18 of the top plate 8, left and right side plates 9, 10, and bottom plate 11, and the second reinforcing members 17, 17 of the buff full plate 15 are as follows: It is preferable to attach using a viscoelastic adhesive or a tape-like adhesive sheet.

Next, in this embodiment, the dimensions (unit: mm) of each part of the cabinet are determined as shown in FIG. A vibrator 19 having the same structure as the speaker unit is attached to the vibrator 1.
9 was applied, and the plate vibration response waveform was measured at each part P1: Frame of the vibrator P2: Near the same frame P3: Center of the side plate P4: Center of the back plate.

FIG. 7 shows the measurement results of the conventional example (without slit-like grooves), FIG. 8 shows the improved structure (with slit-like grooves), and FIG. 9 shows the measurement results of the present example.

[Effect of idea]

The present invention allows (a) to attach the first reinforcing member and to form the slit-like grooves before bending the board to form a cabinet structure, that is, with the board unfolded; and (b) after that. , the substrate can be folded and configured into a cabinet structure.
(c) Since the cabinet in which the slit-shaped groove is formed all around the circumference is reinforced by the first, second, and third reinforcing members, the mechanical strength of the cabinet is increased, and (d) The third reinforcing member can be attached to the joint between the board and the above-mentioned top board and side board with good workability in the same way as in the past. , vibrations propagating to the left and right side plates and the bottom plate are attenuated by the slit-like grooves. (f) As a result, the plate vibrations of the top plate, left and right side plates, bottom plate, and back plate of the cabinet are significantly reduced, and the deterioration of various characteristics caused by plate vibration is improved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the structure of the expanded board of the speaker cabinet (one embodiment) of the present invention, Fig. 2 is a diagram showing the structure of the buttful plate, Figs. 3 and 4 are the same, Figure 5 shows the structure of the speaker cabinet, Figure 5 shows the dimensions of each part, Figure 6 shows the structure of the improved speaker cabinet, Figure 7 shows the conventional speaker cabinet. Vibration response waveform diagram of each part to the impulse of
9 is a vibration response waveform diagram of each part of the improved speaker cabinet to an impulse, and FIG. 9 is a vibration response waveform diagram of each part of the speaker cabinet (one embodiment) of the present invention to an impulse. 6... Board, 7... First reinforcing member, 8...
Top plate, 9, 10...Side plate, 11...Bottom plate, 12...
...Slanted end surface, 13...Slit-like groove, 14...V
shaped groove, 15...bump full plate, 16...slanted end surface,
17...Second reinforcing member, 18...Third reinforcing member.

Claims (1)

[Scope of utility model registration request] The end of the substrate 6 is cut to provide an inclined end surface 12 to be joined to the buffed plate 15, and a slit-like groove 13 of a predetermined depth is provided parallel to the inclined end surface 12 and from the back side of the substrate 6. , V-shaped grooves 14, 14, 14 are provided in a direction perpendicular to the slit-shaped groove 13 with a depth that leaves the surface of the substrate 6, thereby forming the top plate 8, left and right side plates 9, 10, and bottom plate 12 of the cabinet. The slit-like grooves 13 are formed in the portions that should become the left and right side plates 9 and 10.
First reinforcing members 7, 7 having a triangular cross section along
are attached, and the substrate 6 is successively bent inward using the V-shaped grooves 14, 14, 14 as bending parts to form the top plate 8, left and right side plates 9, 10, and bottom plate 11, with an inclined end surface 16 around the periphery. Batsuful board 15 provided
Second reinforcing members 17, 17 having a triangular cross section are attached along the inclined end surfaces of the portions that are to become the left and right side plates 9, 10, and the inclined end surfaces 16 of the buttful plate 15 and the ceiling are attached. The plate 8, the left and right side plates 9, 10, and the inclined end surfaces 12 of the bottom plate 11 are joined, and the second reinforcing members 17, 17 of the bent full plate 15 and the first reinforcing member 7 of the left and right side plates 9, 10 are joined. 7 and facing each other without contact,
A third reinforcing member 18 having a rectangular cross section is provided at the joint between the full plate 15, the top plate 8, and the bottom plate 11.
A speaker cabinet characterized by having 18 installed respectively.