JPH05292588A - Woofer cabinet - Google Patents

Abstract

PURPOSE:To adjust the axial length of the speaker cabinet without any deterioration in characteristics and improve the easiness of use by axially expanding and contracting the speaker cabinet which is partitioned with two electroacoustic means and two intermediate baffles to constitute air chambers while keeping the airtightness. CONSTITUTION:The speaker cabinet 16 is divided into the three air chambers with the two intermediate baffles 15 provided with the electroacoustic means 18a and 18b, and received sound radiating means 19 and 20 are provided at parts of the two air chambers. The speaker cabinet part constituting the air chamber 16c surrounded with the two electroacoustic transducing means 18 and two intermediate baffles 15 is separated into two parts, which are airtightly coupled by a movable part 40 which can expand and contract axially. As the capacity of the 3rd air chamber 16c increases, the low-frequency reproduction limit frequency of sound pressure frequency characteristics decreases and the reproduction frequency band expand. The sound pressure frequency characteristics, however, are held nearly flat even the air capacity increases. Consequently, the axial length of the speaker cabinet can be adjusted without deteriorating the sound pressure frequency characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bass reproduction speaker system, and more particularly to a bass reproduction speaker cabinet in which the axial length of the speaker system can be adjusted without deteriorating the sound pressure frequency characteristics. It is a thing.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view showing a conventional bass reproducing speaker system disclosed in the August 1991 issue of the JAS journal (P.56 to P.59). In FIG. 7, 16 is a speaker cabinet, 15a and 15b are intermediate baffles that divide the inside of the speaker cabinet 16 into three first, second and third air chambers 16a, 16b and 16c, and 18a and 18b are intermediate baffles 15a and 15b. First and second bass speakers, which are electroacoustic conversion means attached to the first and second acoustic ports, and first and second acoustic ports, which are passive acoustic radiation means for radiating acoustic waves to the outside.
Is a third acoustic port which is a passive acoustic radiation means provided in the first air chamber 16a.

In FIG. 7, the bass speakers 18a, 1
8b is connected to vibrate in substantially the same phase (push-pull). At this time, the first and second acoustic ports 19,
The sound pressure frequency characteristics radiated from 20 and their combined sound pressure characteristics are conceptually represented in FIG.

The sound pressure frequency characteristics of the bass reproduction speaker system are as follows.
It changes depending on the acoustic constant of b (equivalent circuit constant), the volume of the air chambers 16a, 16b, 16c in the cabinet, and the like. Therefore, the axial dimension of the speaker system once designed is assembled in a structure that cannot be adjusted by the user so that characteristic deterioration does not occur.

[0005]

However, in the conventional bass reproduction speaker system as shown in FIG. 7, since the cabinet has a columnar shape, the length of the speaker system in the axial direction is particularly dependent on the installed environmental conditions. (height)
Often you want to change. For example, when the present speaker system is used as a speaker system for a television receiver, a height suitable for the television receiver is required. However, since it is impossible to change the height with the conventional structure, the height has been adjusted by mounting the speaker system on a stand or by matching the television receiver to the height of the speaker system. ..

The present invention has been made to solve the above problems, and provides a speaker cabinet for low-pitched sound reproduction in which the axial length of the speaker system can be adjusted without deteriorating the sound pressure frequency characteristics. The purpose is to

[0007]

A speaker cabinet for low-pitched sound reproduction according to the present invention is a speaker cabinet divided into three air chambers of first, second, and third by two intermediate baffles, and the above two intermediate cabinets. First and second electro-acoustic conversion means provided in the baffle and vibrating in substantially the same phase, and a speaker cabinet portion that is divided by the two electro-acoustic conversion means and two intermediate baffles to form an air chamber, It has a structure that can be expanded and contracted in the axial direction.

Further, the structure of the expandable cabinet part separates the speaker cabinet part into two structural members in a direction perpendicular to the axis, and further connects the two structural members in an airtight manner. It is equipped with.

Further, the structure of the cabinet part which can be expanded and contracted separates the speaker cabinet part into two structural members in the direction perpendicular to the axis, and further, the two screw members are hermetically sealed between the two structural members. It is a connection.

[0010]

The speaker cabinet for low-pitched sound reproduction according to the present invention is configured such that the speaker cabinet portion which is divided by the two electro-acoustic conversion means and the two intermediate baffles to form the air chamber can be expanded and contracted in the axial direction while maintaining airtightness. Therefore, the axial length of the speaker cabinet can be adjusted without deteriorating the sound pressure frequency characteristics.

[0011]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing the structure of a speaker cabinet for bass reproduction according to the first embodiment. In the figure, 30 is a flexible member, and the first and second electroacoustic conversion means 18a, 18
The third air chamber 16c partitioned by b and the two intermediate baffles 15a and 15b is configured to be able to expand and contract in the axial direction.

In the first embodiment, the expansion and contraction of the flexible member 30 can adjust the expansion and contraction of the speaker cabinet 16 in the axial direction. As the flexible member 30, a pipe or duct having a flexible structure can be used so that a large adjustment range can be obtained.

FIG. 2 shows two electro-acoustic conversion means 18a, 1
8b, two intermediate baffles 15a and 15b, and the sound pressure frequency characteristic when the volume of the third air chamber 16c surrounded by the flexible member 30 is changed are obtained by simulation. As shown in FIG. 2, when the volume of the third air chamber 16c increases, the low-range reproduction limit frequency of the sound pressure frequency characteristic decreases and the reproduction frequency band expands. However, the sound pressure frequency characteristics are kept almost flat even if the volume of the air chamber increases. Therefore, the axial length of the speaker cabinet can be adjusted without deteriorating the sound pressure frequency characteristics.

FIGS. 3 to 5 are partially enlarged sectional views showing the structure of a speaker cabinet for bass reproduction according to different embodiments of the present invention. In the figure, 41 and 42 are first and second structural members divided into two in a direction perpendicular to the axial direction,
The first and second electroacoustic conversion means 18a, 18b and the two intermediate baffles 15a, 15b constitute a third air chamber 16c.
Make up. Reference numeral 40 denotes a flexible member which is arranged between the first and second structural members 41 and 42 and hermetically seals.

In each of the embodiments shown in FIGS. 3 to 5, the axial length of the speaker cabinet 16 can be adjusted by the axially slidable structural members 41 and 42 and the axially expandable / contractible flexible member 40. It is possible. In this embodiment, since the structure is basically the same as that in FIG. 1, the sound pressure frequency characteristics of the speaker system are kept flat as in FIG. As the flexible member 40, a pipe or duct having a flexible structure can be used.

FIG. 6 is a partially enlarged sectional view showing the structure of a speaker cabinet for bass reproduction according to still another embodiment of the present invention. In the figure, 51 and 52 are first and second structural members that are divided by the first and second electroacoustic conversion means 18a and 18b and the two intermediate baffles 15a and 15b to form the third air chamber 16c. The first and second screw structural members 51 and 52, and 50 are screw-coupled to the first and second screw structural members 51 and 52, and the first and second structural members 4 are provided.
It is a third screw structure member that connects the first and the second screws 42. The third screw structure member 50 is formed with left and right screws having different screw directions at the central portion.

In this embodiment, by rotating the screw structure member 50, the distance between the two structure members 51 and 52 can be adjusted. Therefore, the screw structure member 50 makes it possible to adjust the axial length of the speaker cabinet 16.

[0018]

As described above, the speaker cabinet for low-pitched sound reproduction according to the present invention has a speaker cabinet divided into three air chambers of first, second, and third by two intermediate baffles, and the two intermediate cabinets. The first and second electroacoustic conversion means provided on the baffles and vibrating in substantially the same phase, and the third air separated by the first and second electroacoustic conversion means and the two intermediate baffles. Since the speaker cabinet that surrounds the room is configured to expand and contract in the axial direction, the axial length (height) of the speaker cabinet does not deteriorate the sound pressure frequency characteristics.
Can be adjusted.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a speaker cabinet for bass reproduction according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a sound pressure frequency characteristic of the bass reproduction speaker system according to the first embodiment obtained by a characteristic simulation.

FIG. 3 is a partially enlarged sectional view showing the structure of a speaker cabinet for bass reproduction according to a second embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view showing the structure of a bass speaker cabinet according to a third embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view showing the structure of a bass speaker cabinet according to a fourth embodiment of the present invention.

FIG. 6 is a partially enlarged sectional view showing the structure of a speaker cabinet for bass reproduction according to a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a structure of a conventional bass reproduction speaker cabinet.

FIG. 8 is a characteristic conceptual diagram showing sound pressure frequency characteristics of a conventional bass reproduction speaker system.

[Explanation of symbols]

15a Intermediate baffle 15b Intermediate baffle 16 Speaker cabinet 16a First air chamber provided in the speaker cabinet 16b Second air chamber provided in the speaker cabinet 16c Third air chamber provided in the speaker cabinet 18a Bass speaker 18b which is one electro-acoustic conversion means 18 Bass speaker which is second electro-acoustic conversion means 19 Acoustic port 20 which is the first passive acoustic radiation means 20 Acoustic port which is the second passive acoustic radiation means 21 Acoustic port 30 which is the third passive acoustic radiation means 30 Flexible member 40 Flexible member 41 First structural member 42 Second structural member 50 Third screw structural member 51 First screw structural member 52 Second Screw structural member

Claims (3)

[Claims] 1. A first, a second, and a second baffle provided by two intermediate baffles.
A speaker cabinet divided into three third air chambers, first and second electroacoustic conversion means provided in the two intermediate baffles and vibrating in substantially the same phase, and these two electroacoustic conversion means First and second passive acoustic radiation means respectively provided in a part of the first and second air chambers except the air chamber separated by the two intermediate baffles,
A bass reproduction speaker system configured by a third passive sound radiating means provided in either one of the two air chambers having the first and second passive sound radiating means. And a speaker cabinet portion which is surrounded by the electro-acoustic conversion means and two intermediate baffles to form an air chamber is formed in a structure capable of expanding and contracting in the axial direction of the speaker cabinet. .. 2. The structure of the cabinet part which can be expanded and contracted,
It is composed of two structural members that are bisected in a direction perpendicular to the axis of the speaker cabinet.
The speaker cabinet for bass reproduction according to claim 1, further comprising a flexible member that connects the two structural members in an airtight manner. 3. The structure of the cabinet part which can be expanded and contracted,
2. The speaker cabinet is composed of two structural members that are bisected in a direction perpendicular to the axis of the speaker cabinet, and both are airtightly connected by a third screw structural member. Speaker cabinet for bass reproduction.