JP3959420B2 - Speaker cabinet and speaker using the same - Google Patents

Description

  The present invention relates to a speaker cabinet and a speaker using the speaker cabinet. More specifically, the present invention relates to a speaker cabinet capable of generating a more natural and realistic sound image space and a speaker using the same.

  The design policy of the speaker cabinet has been polarized into the idea of making the radiated sound from the cabinet not resonate as much as possible and the idea of making it sound positive to enrich the sense of volume. As means for realizing the latter way of thinking, the thickness of a plate material constituting the cabinet is reduced, or a plate material having a good sound is used. For example, a cabinet composed of a material for a musical instrument resonance part as a plate material has been proposed (see Patent Document 1). According to Patent Document 1, a cylindrical member is used as a body portion, a front plate and a back plate are bonded to each other to form a hollow cylindrical cabinet, and a speaker unit is attached to the center portion of the front plate of the cabinet. It is described that a speaker with a natural sound output can be obtained.

However, the speaker cabinet described in Patent Document 1 has the following problems. That is, of the radiated sound from the resonance part of an instrument such as a guitar, the radiated sound from the front plate (and the back plate) is larger than the radiated sound from the trunk. This is because the front plate (and the back plate) is formed of a relatively thin plate (typically around 3 mm), and the so-called “taiko” in which the body portion restrains the periphery and the central portion easily vibrates. This is due to having a “structure”. As a result, the string vibration is richly adapted and a timbre full of volume can be obtained. On the other hand, according to the speaker cabinet described in Patent Document 1, an appropriate strength capable of supporting the speaker unit on a part to which the speaker unit is attached (that is, a part corresponding to the front panel of the cabinet = a front panel of the guitar). Since it is requested | required, it is necessary to increase the thickness of a board | plate material. As a result, the radiated sound from the front plate is reduced, and a sound full of volume is not reproduced. If the cabinet is made with the thickness of the surface plate being as thin as the instrument, the strength to support the speaker cannot be obtained, so it cannot be put to practical use or the weight of the speaker must be limited (ie , If you can not use a large output speaker). Furthermore, when the driving power to the speaker unit is increased in such a cabinet, abnormal vibration of the front plate may be caused and abnormal noise may be generated. Even if the speaker unit is mounted well, the weight of the entire surface plate increases due to the weight of the speaker unit itself, so that the vibration of the surface plate is limited and a sound full of volume is not reproduced.
Utility Kaihei 6-23394

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a speaker cabinet capable of generating a more natural and realistic sound image space and a speaker using the same. is there.

  The speaker cabinet of the present invention is formed by attaching a single bent plate to a pair of side plates corresponding to the outer peripheral portion of the pair of side plates. In another embodiment of the present invention, the speaker cabinet has a pair of side plates whose outer peripheral portions do not define the apex, and a single bent plate attached to the outer peripheral portion of the pair of side plates. Become.

  In a preferred embodiment, the side plate has a straight front surface portion, a straight bottom surface portion, and a curved rear portion, and the front surface portion, the bottom surface portion, and the rear portion define apexes at their connection portions. The outer peripheral part is formed continuously so as not to occur.

  In preferable embodiment, the attachment auxiliary member is provided in the attachment part of the said side plate and the said bending plate.

  In a preferred embodiment, an opening is provided in at least a part of the bent plate and the side plate.

  In a preferred embodiment, an auxiliary baffle plate is provided at least inside the front surface of the bent plate.

  According to another aspect of the present invention, a speaker is provided. In this speaker, at least one speaker unit is attached to the front surface of the bent plate of the speaker cabinet.

  According to the present invention, instead of forming the rectangular parallelepiped box-shaped cabinet by attaching the four plates of the front surface, the top surface, the rear surface, and the bottom surface to the side plates, the cabinet is configured by curving one bent plate. By adopting such a configuration, the vibration of the side plate becomes dominant, and the abnormal vibration of the bending plate (corresponding to the front plate and the front surface) to which the speaker unit is attached can be significantly suppressed. Further, since the vibration of the side plate is transmitted from the speaker unit via the air inside the main body and the inside, the vibration is increased by forming the side plate as a continuous curved surface and using a thin material. be able to. As a result, a sound image space with a large volume is formed. More specifically, in the past, there has been an attempt to create a speaker in which a string that is a guitar sound source is associated with a speaker unit, and the speaker unit is attached to a portion corresponding to the front panel of the guitar. Because it is too heavy to compare, such a speaker has made little use of the utility of the spatial structure of the guitar. On the other hand, according to the present invention, by attaching a speaker unit to a bent plate (a portion corresponding to the body of an acoustic guitar), portions corresponding to the front and back plates of the acoustic guitar (ie, the side plates 11 and 12) are removed. It can be vibrated very well, and can reproduce sound that makes full use of the utility of the acoustic guitar's spatial structure (a structure that allows rich string vibration to be richly adapted). As a result, a very natural and realistic sound can be reproduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

  FIG. 1A is a schematic perspective view illustrating a speaker system using a speaker cabinet according to a preferred embodiment of the present invention, and FIG. 1B is a schematic perspective view illustrating a state in which a side plate of the speaker system is removed. It is. FIG. 2 is a schematic cross-sectional view from the side plate direction of the speaker system of FIG. FIG. 3 is a schematic cross-sectional view from the side plate direction of a speaker according to another embodiment. First, the speaker cabinet will be described. The speaker cabinet 10 includes a pair of side plates 11 and 12 with a single bent plate 13 attached thereto. The side plates 11 and 12 include a portion where the outer peripheral portion does not define the apex (that is, smoothly continuous). In the illustrated example, each of the side plates 11 and 12 has a shape in which the outer peripheral portion does not define the apex. The bending plate 13 is attached in a curved manner corresponding to the outer peripheral portions of the side plates 11 and 12. One of the features of the present invention is that the cabinet is formed by bending one bent plate instead of forming the cabinet by attaching the four plates of the front, top, rear and bottom to the side plate. is there. By adopting such a configuration, the vibration of the side plate becomes dominant, and the abnormal vibration of the bending plate (corresponding to the front plate and the front surface) to which the speaker unit is attached can be significantly suppressed. That is, securing of the mounting strength of the speaker unit and active vibration of the cabinet can both be achieved. As a result, a sound image space with a large volume is formed.

  The side plate 11 will be specifically described (the same applies to the side plate 12). The side plate 11 typically has a front surface portion 11a, a bottom surface portion 11b, and a rear portion 11c, so that the front surface portion, the bottom surface portion, and the rear portion do not define a vertex at their connection portions (that is, The outer periphery is continuously formed (in a smooth arc). By using such a side plate, one bent plate can be curved and attached to the side plate. Preferably, as shown in FIG. 1, the front surface portion 11a and the bottom surface portion 11b of the side plate are linear, and the rear portion 11c is curved. By bending the rear portion of the side plate (that is, the contour outer periphery of the side plate is a curve), the bent plate attached corresponding to the outer peripheral portion of the side plate is also bent at the rear portion. As a result, it is possible to prevent the vibration of the sound wave from being disturbed while maintaining the strength as the enclosure. Furthermore, the vibration emitted from the speaker unit is transmitted to the side plate via the cabinet body and the internal air, and can be vibrated very well. Therefore, a speaker cabinet having a sufficiently practical strength and capable of generating a sound full of volume can be obtained. In the illustrated example, the side plate has a flat plate shape, but may have a shape that is convex and curved outward. By adopting such a configuration, it is possible to enhance the sub sound source function of the cabinet and radiate sound waves over a wider range. Further, by attaching a force tree to the side plate and changing its position and shape, the vibration characteristics of the side plate may be changed to create a timbre individuality as a speaker cabinet.

  As a material constituting the side plate and the bent plate, typically, Sitka spruce, Ingleman spruce, Cedar, Ezo pine, Indian rosewood, Brazilian rosewood, Honduras rosewood, Madagascar rosewood, Cocoboro, New Hacaranda, Mahogany, Sapele, Honduras mahogany, core, maple, walnut, basswood, ash, ebony, sen, alder, bubinga, spruce, rosewood, german pine, obangkor, seapress, coral, kaya, sycamore, granadia, marine and their Examples include plywood. Materials used for the body of an acoustic guitar are preferable, and sapele, mahogany, spruce, rosewood, and maple are more preferable. Since the present invention takes advantage of the spatial structure of an acoustic guitar, it is highly preferable to use an acoustic guitar material in terms of matching the spatial structure with the material.

  The bending plate may have any appropriate thickness as long as it can be curved corresponding to the outer peripheral shape of the side plate and can support the speaker unit. Typically, the bending plate has a thickness of 3 to 6 mm. Moreover, the thickness of a side plate is 2-4 mm typically. Such a cabinet made of a thin material is based on a technical idea that is completely different from the conventional rectangular box-shaped cabinet.

  Preferably, as shown in FIG. 2, an auxiliary baffle plate 14 is provided at least inside the front surface portion of the bending plate 13. The means for attaching the auxiliary baffle plate is not particularly limited, and is typically attached to a bent plate. By providing the auxiliary baffle plate 14, the strength to support the speaker unit is given to the thin bent plate. Any appropriate material can be adopted as the material used for the auxiliary baffle plate as long as it does not adversely affect the acoustic characteristics of the cabinet. Specifically, in addition to various single plates, plywood or MDF is used. Moreover, practically, it is preferable that the cabinet of the present invention is provided with the pedestal 15 so that the cabinet vibration is not hindered by being arranged directly on the floor, for example. In this case, it is preferable to provide the base mounting portion 16 on the bottom surface of the bending plate 13. In one embodiment, as shown in FIG. 3, the auxiliary baffle plate 14 and the base mounting portion 16 may be integrally formed. Preferably, the auxiliary baffle plate 14 and the base mounting portion 16 are so-called chamfered at the ends and edges. By doing in this way, the influence which the auxiliary baffle board 14 and the base part attaching part 16 have on the acoustic characteristic of a cabinet can further be reduced. In addition, this makes it possible to reduce the bonding area with the side plate.

  FIG. 4 is a schematic diagram for explaining an attachment portion between the side plate 11 or 12 and the bending plate 13. As shown in FIG. 4, in a preferred embodiment of the present invention, an attachment auxiliary member 17 is provided at an attachment portion between the side plate 11 or 12 and the bending plate 13. Typically, the attachment auxiliary member 17 is attached to the side plate 11 or 12 and the bending plate 13. By bonding the side plate 11 or 12 and the bending plate 13 via the attachment auxiliary member 17, the adhesive strength between the side plate 11 or 12 and the bending plate 13 is appropriately maintained, and the side plate 11 or 12 and the bending plate 13 are maintained. The contact area with can be made as small as possible. Furthermore, the strength of the speaker cabinet can be ensured by adjusting the strength of the attachment assisting member by adjusting the strength by inserting a slit or the like. As a result, all members constituting the cabinet vibrate without being restricted, and further, vibrations (for example, distortion and twist) of the entire cabinet due to these vibrations are not restricted. Therefore, a speaker cabinet capable of generating a sound with a large volume can be obtained. The attachment auxiliary member 17 may be used over the entire attachment portion of the side plate 11 or 12 and the bending plate 13, or may be used only for a part thereof. The shape of the attachment assisting member, the place of use, the number of use, and the like can be appropriately set according to the purpose and desired sound properties.

  Any appropriate material can be adopted as the material of the attachment auxiliary member 17 as long as the effects of the present invention can be obtained. Typically, soft wood is used, and preferably, a material used for a reinforcing member (so-called lining) used for joining a body portion and a front plate or back plate in an acoustic guitar is used. Specific examples include cedar and spruce. By using such a material, the reproduced sound becomes a very natural and realistic sound.

  Preferably, an opening may be formed in at least a part of the bent plate and the side plate. Preferably, the opening may be formed in the front portion of the bending plate. Such an opening can function as a bass reflex duct in a speaker and / or as a sound hole in an acoustic guitar. The resonance characteristics of the cabinet can be changed by changing the shape, forming location, and number of openings. Therefore, by setting them appropriately, it is possible to realize characteristics desired for the target speaker.

  Referring again to FIG. 1, a speaker system according to a preferred embodiment of the present invention will be described. In the speaker system 100 of the present invention, at least one speaker unit (the woofer 20 and the tweeter 30 in the illustrated example) is attached to the front surface of the bending plate 13 of the speaker cabinet 10. It goes without saying that the type and number of speaker units to be attached can be changed according to the purpose. One of the major features of the present invention is that the speaker unit is attached to the bent plate.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and any appropriate modifications can be made as long as the effects of the present invention are exhibited. For example, in the embodiment shown in FIG. 1, the side plate does not have a vertex, but the side plate may partially have a vertex.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.

  A 4.5 mm thick sapelli plywood was used as the bending plate, a 3 mm thick sapele was used as the side plate, and a 12 mm thick MDF was used as the auxiliary baffle plate. As the speaker unit, a woofer having a diameter of 10 cm was attached to the front portion of the bent plate. In addition, as a mounting auxiliary member, spruce force wood was attached to the mounting portion between the bent plate and the side plate. Thus, a speaker as shown in FIGS. 1 and 2 was produced. The vibration mode of the obtained speaker was simulated by eigenvalue analysis. The simulation is not a state in which the speaker unit is attached, but the ease of vibration determined by the shape of the cabinet itself. FIG. 5 shows the vibration mode in which the primary mode appears.

(Comparative Example 1)
A conventional rectangular parallelepiped box-shaped speaker was produced. For the front surface, top surface, rear surface, bottom surface and the pair of side plates, MDF having a thickness of 10 mm was used. The same speaker unit as in Example 1 was attached to the front surface. The vibration mode of the speaker thus obtained was simulated by eigenvalue analysis. FIG. 6 shows the vibration mode in which the primary mode appears.

  As is clear from comparison between FIG. 5 and FIG. 6, in the speaker of the embodiment of the present invention, the vibration of the side plate is dominant, and no divided vibration or abnormal vibration occurs in the bending plate. On the other hand, in the speaker of the comparative example, it can be seen that split vibrations are generated on the top and front surfaces in addition to the vibration of the side plate, which adversely affects the reproduced sound.

  The speaker cabinet of the present invention is extremely useful for a speaker that reproduces a natural and voluminous sound.

FIG. 1 is a schematic perspective view illustrating a speaker system using a speaker cabinet according to a preferred embodiment of the present invention. It is a schematic sectional drawing from the side-plate direction of the speaker system of FIG. It is a schematic sectional drawing from the side-plate direction of the speaker system by another embodiment. It is the schematic explaining the attachment part of the side board and bending board in the speaker cabinet by preferable embodiment of this invention. It is a schematic diagram which shows the vibration mode simulation result of the speaker of the Example of this invention. It is a schematic diagram which shows the vibration mode simulation result of the speaker of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Speaker cabinet 11 Side plate 12 Side plate 13 Bending plate 14 Auxiliary baffle plate 17 Attachment auxiliary member 20 Woofer 30 Tweeter 100 Speaker

Claims (7)

A speaker cabinet comprising a pair of side plates each having a thickness of 2 to 4 mm whose outer peripheral portions do not define an apex, and a single bent plate attached to the outer peripheral portions of the pair of side plates. The side plate has a straight front portion, a straight bottom portion, and a curved rear portion, and the front portion, the bottom portion, and the rear portion are continuously arranged so as not to define a vertex at their connecting portions. The speaker cabinet according to claim 1 , wherein the speaker cabinet forms an outer peripheral portion. The material constituting the bent plate and the side plate is Sitka spruce, Ingleman spruce, Cedar, Ezo pine, Indian rosewood, Brazilian rosewood, Honduras rosewood, Madagascar rosewood, Cocoboro, New Hacaranda, mahogany, sapele, Honduras mahogany, From the group consisting of Core, Maple, Walnut, Basswood, Ash, Ebony, Sen, Alder, Bubinga, Spruce, Rosewood, German Pine, Obankor, Seapress, Coral, Kaya, Sycamore, Granadia, Marilyn and their plywood The speaker cabinet according to claim 1 or 2, which is selected.   The speaker cabinet according to claim 1, wherein an attachment auxiliary member is provided at an attachment portion between the side plate and the bent plate.   The speaker cabinet according to claim 1, wherein an opening is provided in at least a part of the bent plate and the side plate.   The speaker cabinet according to claim 1, wherein an auxiliary baffle plate is provided at least inside the front surface portion of the bent plate. A speaker system in which at least one speaker unit is attached to a front surface portion of a bent plate of the speaker cabinet according to claim 1.

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