JP2009010854A - Double coil speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save troubles when changing the connection of parallel/series bi-amplifiers. <P>SOLUTION: A printed-wiring board 3A is fixed to the lower portion of first input terminals IN1(+), IN1(-) and second ones IN2(+), IN2(-) fixed to a terminal block 2A. A fuse holder 3A and a rotary switch 40 are attached to the printed-wiring board 3A. The fuse holder 3A has first voice coil terminals VC1(+), VC1(-) and second voice coil terminals VC2(+), VC2(-) connected to both the ends of first and second voice coils VC1, VC2 and two pairs of terminals HT11, HT12 and HT21, HT22 for fuses. The rotary switch 40 has first and second switch circuits 41, 42 including movable contacts X, Y and first-third fixed contacts X1-X3, Y1-Y3 corresponding to three positions of parallel, series, and bi-amplifiers. The IN1(+) is connected to VC1(+) and Y. The IN1(-) is connected to the HT11 and X. The HT12 is connected to the VC1(-). The IN2(+) is connected to the Y1 and HT21. The HT22 is connected to the VC2(+). The X2 is connected to the VC2(+). The IN2(-) is connected to the VC2(-) and X1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a double-coil speaker, and more particularly to a double-coil speaker in which the connection method of two voice coils and an amplifier can be switched between three series, parallel, and bi-amplifier.

Speakers such as subwoofers are of a double coil type having two sets of voice coils in order to enable small size and high output. This double-coil speaker and amplifier connection method is a series connection in which two voice coils are connected in series to one amplifier, a parallel connection in which two voice coils are connected in parallel to one amplifier, There are three types of bi-amplifier connections that connect one amplifier to each voice coil.
FIG. 1 shows a circuit diagram of a conventional double coil speaker. Reference numeral 1 is a speaker unit, 2 is a terminal block mounted on a frame (not shown) of the speaker unit, 3 is a printed wiring board built in the terminal block, and VC1 and VC2 are first and second voice coils. IN1 (+), IN1 (−), IN2 (+), and IN2 (−) are a positive first input terminal, a negative first input terminal, and a positive second input terminal fixed on the terminal block 2, respectively. It is a negative second input terminal, and a printed wiring board 3 is attached to the lower part. VC1 (+) and VC1 (−) are a positive first voice coil terminal and a negative first voice coil terminal fixed to the printed wiring board 3, and are connected to the first voice coil VC1 via the cotton yarn lines FL11 and FL12. It is connected. VC2 (+) and VC2 (−) are a positive second voice coil terminal and a negative second voice coil terminal fixed to the printed wiring board 3, and are connected to the second voice coil VC2 via the cotton yarn lines FL21 and FL22. It is connected. Reference numeral 4 denotes a fuse holder attached to the printed wiring board 3, and four first to fourth fuses 11 to 14 can be detachably inserted from the outside of the terminal block 2. The fuse holder 4 includes four pairs of first to fourth fuse terminals HT11 and HT12, HT21 and HT22, HT31 and HT32, HT41 and HT42, between HT11 and HT12, between HT21 and HT22, and between HT31 and HT32. The first to fourth fuses 11 to 14 are detachable between the HT41 and the HT42. The plus side first input terminal IN1 (+) is connected to the plus side first voice coil terminal VC1 (+) and the second fuse terminal HT22, and the minus side first input terminal IN1 (−) is for the first fuse. The first fuse terminal HT12 is connected to the terminal HT11. The first fuse terminal HT12 is connected to the negative first voice coil terminal VC1 (−) and the third fuse terminal HT32. The third fuse terminal HT31 is connected to the second fuse terminal HT21 and the fourth fuse terminal HT42. The positive second input terminal IN2 (+) is connected to the fourth fuse terminal HT41, and the fourth fuse terminal HT42 is connected to the positive second voice coil terminal VC2 (+). The two input terminals IN2 (−) are connected to the negative second voice coil terminal VC2 (−).

  The terminal block 2 is provided with a knob 5 that slides on the fuse holder 3 to move to three positions of parallel, bi-amplifier, and series, and opens a place where the fuse is inserted according to the connection method (see FIG. 2). For example, in the case of parallel connection, as shown in FIG. 2A, the plus speaker output terminal SP (+) and minus speaker output terminal SP (−) of one amplifier 20 are connected to the plus side using the speaker connection cord 21. The first input terminal IN1 (+) is connected to the negative second input terminal IN2 (−), and the short first cord 22 is used to connect the negative first input terminal IN1 (−) to the negative second input terminal IN2 (−). And the knob 5 is moved to the uppermost parallel position (PARALLEL), and the third and fourth fuses 13 and 14 that can be inserted are attached (the first and second fuses 11 and 12 are the knob 5). Can't be plugged in.) As a result, the first and second voice coils VC1 and VC2 are connected in parallel to the amplifier 20. When switching to the series connection, as shown in FIG. 2 (2), the short cord 22 and the third and fourth fuses 13 and 14 are removed, and the knob 5 is moved to the lowest series position (SELIES) so that it can be inserted. The first and second fuses 11 and 12 are mounted (the third and fourth fuses 13 and 14 cannot be inserted by the knob 5). As a result, the first and second voice coils VC1 and VC2 are connected in series to the amplifier 20. Further, when switching to the bi-amp connection, as shown in FIG. 3, the plus-side speaker output terminal SP1 (+) and the minus-side speaker output terminal SP1 (-) of the first amplifier 23 are connected to the plus-side first input using the speaker connection cord 24. The terminal IN1 (+) is connected to the minus side first input terminal IN1 (−), and the plus side speaker output terminal SP2 (+) and the minus side speaker output terminal SP2 (−) of the second amplifier 25 are connected to the speaker connection cord 26. Use the positive side second input terminal IN2 (+) and the negative side second input terminal IN2 (-) to connect, remove the second fuse 12, move the knob 5 to the middle bi-amplifier position (BI-AMP), The fourth fuse 14 that can be inserted is mounted (the second and third fuses 12 and 13 cannot be inserted by the knob 5). Thereby, the two first and second amplifiers 23 and 25 are individually connected to the first and second voice coils VC1 and VC2.

  In the conventional configuration described above, when switching the connection method, it is necessary to attach and detach the short cord 22, move the knob 5, and insert and remove the first to fourth fuses 11 to 14. Also, storing the short cord 22 that is no longer necessary when connecting the series and the bi-amplifier is troublesome. Note that the audio output device disclosed in Japanese Patent Application Laid-Open No. 2006-279537 is merely capable of switching the connection between a plurality of amplifiers and a plurality of speakers by a plurality of changeover switches. Not possible (Patent Document 1).

JP 2006-279537 A

  An object of the present invention is to provide a double coil speaker that does not require time and effort to switch connection between parallel, series, and bi-amplifiers.

In the present invention, the positive first input terminal and the negative first input terminal connected to the first voice coil via the first connection line and the second connection line, the third connection line and the fourth connection line. In a double coil speaker having a positive second input terminal and a negative second input terminal connected to the second voice coil, the first can be switched to three first to third positions in conjunction with each other. A switch circuit and a second switch circuit are provided, and a two-circuit, three-position rotary switch connected to the first to fourth connection lines is provided. When the rotary switch is switched to the first position, the first switch circuit is The second connection line and the fourth connection line are conducted, and the second switch circuit is conducted between the first connection line and the third connection line and switched to the second position. One of the first switch circuit and the second switch circuit conducts between the second connection line and the third connection line, and the other does not conduct between any of the first to fourth connection lines, and the third position. When switched to, both the first switch circuit and the second switch circuit are prevented from conducting during any of the first to fourth connection lines.
A fuse may be inserted into at least one of the first connection line and the second connection line and at least one of the third connection line and the fourth connection line.

  According to the present invention, it is possible to easily switch connection between parallel, series, and bi-amplifiers by simply changing the position of a two-circuit, three-contact rotary switch.

  Fix the positive side first input terminal, negative side first input terminal, positive side second input terminal, negative side second input terminal to the terminal block of the double coil speaker unit, and add it to the printed wiring board built in the terminal block. The side first voice coil terminal, the minus side first voice coil terminal, the plus side second voice coil terminal, and the minus side second voice coil terminal are fixed. The plus side first voice coil terminal and the minus side first voice coil terminal are connected to the first voice coil via a cotton yarn wire, and the plus side second voice coil terminal and the minus side second voice coil terminal are connected via a cotton yarn wire. Connect to the second voice coil. Install a fuse holder and a 2-circuit, 3-position rotary switch on the printed circuit board. The positive first input terminal is connected to the positive first voice coil terminal via the first connection line, and the negative first input terminal is negative via the second connection line with a first fuse interposed therebetween. Connected to the first voice coil terminal on the side, and the second input terminal on the positive side is connected to the second voice coil terminal on the positive side via the third connection line with the second fuse interposed therebetween. And the negative second input terminal is connected to the negative second voice coil terminal via the fourth connection line. Each of the two first and second switch circuits of the rotary switch has one movable contact and three first to third fixed contacts, and the first and second switch circuits position the rotary switch in parallel position from the outside of the terminal block. The movable contact and the first fixed contact are closed when turned to (P), the movable contact and the second fixed contact are closed when turned to the series position (S), and the movable contact and the third fixed contact are turned to the bi-amplifier position (B). Fixed contact closes. The movable contact of the first switch circuit is connected to the second connection line, the first fixed contact is connected to the fourth connection line, the second fixed contact is connected to the third connection line after the second fuse, and the third The fixed contact is opened. The movable contact of the second switch circuit is connected to the first connection line, the first fixed contact is connected to the third connection line, and the second and third fixed contacts are opened. A knob with a groove is attached to the rotary shaft of the rotary switch, and a minus driver is inserted into the groove from the outside of the terminal block so that it can be rotated to three positions.

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 4 is a circuit diagram of the speaker unit of the double coil speaker according to the present invention. The same components as those in FIG.
In FIG. 4, reference numeral 2A denotes a terminal block, which is attached to the frame 6 of the speaker unit 1A by mounting screws 7 as shown in FIG. As shown in FIG. 6, the terminal block 2A includes a positive first input terminal IN1 (+), a negative first input terminal IN1 (-), a positive second input terminal IN2 (+), and a negative second input terminal IN2. (+) Is fixed, and a printed wiring board 3A is built inside the terminal block 2A. The printed wiring board 3A is below the plus side first input terminal IN1 (+), minus side first input terminal IN1 (−), plus side second input terminal IN2 (+), and minus side second input terminal IN2 (+). (See FIG. 7). The printed wiring board 3A includes a positive first voice coil terminal VC1 (+), a negative first voice coil terminal VC1 (−), a positive second voice coil terminal VC2 (+), and a negative second voice coil terminal VC2. (-) Is fixed. The plus side first voice coil terminal VC1 (+) and the minus side first voice coil terminal VC1 (−) are connected to the first voice coil VC1 via the cotton yarn lines FL11 and FL12, and the plus side second voice coil terminal. VC2 (+) and the negative second voice coil terminal VC2 (−) are connected to the second voice coil VC2 via cotton yarn lines FL21 and FL22 (see FIG. 5).

  A fuse holder 4A and a rotary switch 40 with two circuits and three contacts are mounted on the printed wiring board 3A. The fuse holder 4A has two pairs of first and second fuse terminals HT11 and HT12, HT21 and HT22, and is exposed to the outside through the opening 8 of the terminal block 2A. The first and second fuses 11 and 12 are externally exposed. Can be detachably inserted (see FIGS. 5 to 7). The two first and second switch circuits 41 and 42 of the rotary switch 40 each have one movable contact X and Y and three first to third fixed contacts X1 to X3 and Y1 to Y3. The knob 43 attached to the rotary shaft (not shown) of the rotary switch 40 is exposed to the outside through the opening 9 of the terminal block 2A. When the knob 43 is turned to the parallel position (P), the movable contact X and the first The fixed contact X1 is closed, the movable contact Y and the first fixed contact Y1 are closed, and when it is turned to the series position (S), the movable contact X and the second fixed contact X2 are closed, and the movable contact Y and the second fixed contact Y2 are closed. The movable contact X and the third fixed contact X3 are closed when the bi-amplifier position (B) is turned, and the movable contact Y and the third fixed contact Y3 are closed. The plus side first input terminal IN1 (+) of the printed wiring board 3A is connected to the plus side first voice coil terminal VC1 (+) via the first connection line L1, and the minus side first input terminal IN1 (− ) Is connected to the negative first voice coil terminal VC1 (−) through a second connection line L2 in which the first fuse 11 is inserted in the middle. Further, the plus side second input terminal IN2 (+) of the printed wiring board 3A is connected to the plus side second voice coil terminal VC2 (+) through the third connection line L3 in which the second fuse 12 is inserted midway. And is connected to the minus-side second voice coil terminal VC2 (−) via the minus-side second input terminal IN2 (−) and the fourth connection line L4. The movable contact X of the first switch circuit 41 of the rotary switch 40 is connected to the second connection line L2, the first fixed contact X1 is connected to the fourth connection line L4, and the second fixed contact X2 is the second connection line L2. The fuse 12 is connected to the third connection line L3 on the rear side, and the third fixed contact X3 is opened. The movable contact Y of the second switch circuit 41 of the rotary switch 40 is connected to the first connection line L1, the first fixed contact Y1 is connected to the third connection line L3, and the second and third fixed contacts Y2. , Y3 are open. The knob 43 mounted on the rotary shaft of the rotary switch 40 is provided with a groove 44 for inserting and rotating a flathead screwdriver, and the direction of the groove 44 indicates the switch position (see FIGS. 5 and 6). . On the surface of the terminal block 2A, characters “P”, “B”, and “S” indicating the switching positions of the three parallel, series, and bi-amplifiers of the rotary switch 40 are displayed (see FIG. 6).

Next, the operation of the above embodiment will be described with reference to FIGS. The first fuse 11 and the second fuse 12 are inserted between the first fuse terminals HT11 and HT12 and the second fuse terminals HT21 and HT22 in advance, regardless of the parallel, series, or bi-amplifier connection method.
(1) Parallel connection (see Fig. 8 (1))
When connecting in parallel, the plus side speaker output terminal SP (+) and the minus side speaker output terminal SP (−) of one amplifier 20 are connected to the plus side first input terminal IN1 ( (+) And the minus side second input terminal IN2 (−), and a minus driver is inserted into the groove 44 of the knob 43 and turned to the parallel position (P) (state of FIG. 4). Then, the movable contact X of the first switch circuit 41 comes into contact with the first fixed contact X1, and conduction is established between the second connection line L2 and the fourth connection line L4, and the movable contact Y of the second switch circuit 42 is the first. The first contact line L1 and the third connection line L3 are brought into contact with the fixed contact Y1, and the first and second voice coils VC1 and VC2 are connected in parallel to the amplifier 20. At this time, if an overcurrent flows through the first voice coil VC1, the first fuse 11 is blown and protected, and if an overcurrent flows through the second voice coil VC2, the second fuse 12 is cut and protected.
(2) Series connection (See Fig. 8 (2))
When switching to the series connection, the plus side speaker output terminal SP (+) and the minus side speaker output terminal SP (−) of the amplifier 20 are connected to the plus side first input terminal IN1 (+) of the terminal block 10A using the speaker connection cord 21. Then, the knob 43 is turned to the series position (S) while being connected to the minus side second input terminal IN2 (−). Then, the movable contact X of the first switch circuit 41 comes into contact with the second fixed contact X2 to conduct between the second connection line L2 and the third connection line L3, and the movable contact Y of the second switch circuit 42 becomes the second. The contact between the first contact line L1 and the third and fourth lines L3 and L4 is brought into an open state in contact with the fixed contact Y2, and the first and second voice coils VC1 and VC2 are connected in series to the amplifier 20. At this time, if an overcurrent flows through the first voice coil VC1 and the second voice coil VC2, the first fuse 11 is blown and protected.
(3) Bi-amplifier connection (see Fig. 9)
When switching to the bi-amp connection, the plus-side speaker output terminal SP1 (+) and the minus-side speaker output terminal SP1 (−) of the first amplifier 23 are minus with the plus-side first input terminal IN1 (+) using the speaker connection cord 24. Side positive input terminal IN1 (−) and the positive side speaker output terminal SP2 (+) and the negative side speaker output terminal SP2 (−) of the second amplifier 25 are connected to the positive side second input using the speaker connection cord 26. The terminal IN2 (+) is connected to the negative second input terminal IN2 (−), and the knob 43 is turned to the pie amplifier position (B). Then, the movable contact X of the first switch circuit 41 comes into contact with the third fixed contact X3, and the connection between the second connection line L2 and the third and fourth lines L3 and L4 is opened, and the second switch circuit 42 is movable. The contact Y comes into contact with the third fixed contact Y3, and the connection between the first connection line L1 and the third and fourth lines L3 and L4 is opened, and the two first and second amplifiers 23 and 25 are first, The second voice coils VC1 and VC2 are individually connected. At this time, if an overcurrent flows through the first voice coil VC1, the first fuse 11 is blown and protected, and if an overcurrent flows through the second voice coil VC2, the second fuse 12 is cut and protected.

  According to this embodiment, the first fuse 11 and the second fuse 12 are inserted between the first fuse terminals HT11 and HT12 and the second fuse terminals HT21 and HT22 in advance, and the knob 43 is turned. By switching the position of the rotary switch 40 with two circuits and three contacts, it is possible to easily switch between parallel, series, and bi-amplifier connections, eliminating the need for connecting / disconnecting fuses, attaching / detaching and storing short codes.

In the above-described embodiment, the second fixed contact X2 of the first switch circuit 41 is connected to the third connection line L3 after the second fuse 12, but may be connected before the second fuse 12. Good (in this case, if an overcurrent flows through the first voice coil VC1 and the second voice coil VC2 during series connection, the first and second fuses 11 and 12 are blown and protected). Further, although the first fuse 11 is inserted in the middle of the second connection line L2, it may be inserted in the middle of the first connection line L1, as shown in the upper part of FIG. Furthermore, although the second fuse 12 is inserted in the middle of the third connection line L3, it may be inserted in the middle of the fourth connection line L4 as shown in the lower part of FIG. If the overcurrent is about to flow through the first voice coil VC1 and the second voice coil VC2 when the series is connected, the first and second fuses 11 and 12 are blown and protected).
In the above-described embodiment, when the rotary switch 40 is switched to the series position, the first switch circuit 41 conducts the second connection line L2 and the third connection line L3. However, the rotary switch 40A in FIG. , The movable contact X of the first switch circuit 41A is connected to the second connection line L2, the first fixed contact X1 is connected to the fourth connection line L4, and the second and third fixed contacts X2 and X3 are opened. The movable contact Y of the second switch circuit 42A is connected to the third connection line L3, the first fixed contact Y1 is connected to the first connection line L1, and the second fixed contact Y2 is connected to the second connection line L2. When the third fixed contact Y3 is opened and switched to the parallel position, the first switch circuit 41A conducts the second connection line L2 and the fourth connection line L4, and the second switch circuit 42 There conductive with the first connection line L1 of the third connection line L3, when switching the series position, a second switch circuit 42A may be electrically connected to the second connection line L2 a third connection line L3.

  The present invention can be applied to various double coil speakers such as a speaker unit such as a woofer and a subwoofer and a speaker with a housing.

It is a circuit diagram of the conventional double coil speaker. It is explanatory drawing of the connection switching method of the conventional parallel and series. It is explanatory drawing of the connection switching method of the conventional biamplifier. 1 is a circuit diagram of a double coil speaker according to the present invention (Example 1). FIG. It is a top view of the speaker unit of FIG. It is a front view of the terminal block in FIG. FIG. 7 is a side view of FIG. 6. It is explanatory drawing of the connection switching method of a parallel and a series. It is explanatory drawing of the connection switching method of a bi-amplifier. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the other modification of FIG.

Explanation of symbols

1A Speaker unit 2A Terminal block 3A Printed wiring board 4A Fuse holder 11 First fuse 12 Second fuse 40, 40A Rotary switch 41, 41A First switch circuit 42, 42A Second switch circuit 43 Knob IN1 (+) Plus side first Input terminal IN1 (-) Negative first input terminal IN2 (+) Positive second input terminal IN2 (-) Negative second input terminal VC1 (+) Positive first voice coil terminal VC1 (-) Negative first 1 voice coil terminal VC2 (+) positive second voice coil terminal VC2 (-) negative second voice coil terminal VC1 first voice coil VC2 second voice coil

Claims (2)

A positive first input terminal and a negative first input terminal connected to the first voice coil via the first connection line and the second connection line, and a second voice via the third connection line and the fourth connection line. In a double coil speaker comprising a plus side second input terminal and a minus side second input terminal connected to a coil,
A first switch circuit and a second switch circuit that can be switched to three first to third positions in conjunction with each other, and having a two-circuit three-position rotary switch connected to the first to fourth connection lines,
When the rotary switch is switched to the first position, the first switch circuit conducts between the second connection line and the fourth connection line, the second switch circuit conducts between the first connection line and the third connection line, When switched to the second position, one of the first switch circuit and the second switch circuit conducts between the second connection line and the third connection line, and the other is between any of the first to fourth connection lines. When the switch is switched to the third position, both the first switch circuit and the second switch circuit are prevented from conducting during any of the first to fourth connection lines.
A double-coil speaker. A fuse is inserted in at least one of the first connection line and the second connection line and one of the third connection line and the fourth connection line;
The double coil speaker according to claim 1.

Images