JPH0591089U - Active speaker unit - Google Patents

Abstract

(57) [Abstract] [Purpose] Dustproof, active speaker unit
The purpose is to be able to deal with both waterproofing and heat dissipation at the same time. [Structure] The cap (1
5, 15M), the opening (16) is fixed to the frame (12) of the speaker (11), and a speaker driving electronic circuit component group (13, 13P) is provided in the cap.
The heat generating circuit component (13P) in the electronic circuit component group is configured to radiate heat to the frame (12) through the cap (15M) or directly to the frame (12).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an active speaker unit. For example, in car audio systems, the adoption of active speaker units has recently been proposed. In this active speaker unit, a part of the electronic circuit component group that was conventionally placed on the audio set body side was moved to the speaker side, and a speaker carried on the frame and a plurality of electronic circuits that drive this speaker. It is an integrated product with parts.

By adopting such an active speaker unit, (i) the components of the audio set body side can be reduced and miniaturization can be achieved, and (ii) the equalizer for correcting the acoustic characteristic in the vehicle compartment can be moved to the speaker side. , It is possible to individually provide equalizer characteristics suitable for each speaker in each vehicle compartment, so that the circuit configuration on the audio set body side can be made common to all speakers, improving mass productivity, etc. The advantages of will be given.

[0003]

[Prior Art]

 In realizing an active speaker unit, a group of electronic circuit components for driving the speaker will be provided on the speaker side. Further, since the speaker is generally provided in the vehicle compartment, particularly in the rear tray near the trunk, the electronic circuit component group is also placed on the rear tray side. Furthermore, heat-generating circuit parts, that is, power ICs, will also be placed on the rear tray side.

[0004]

[Problems to be solved by the device]

 As described above, the electronic circuit component group for driving the speaker is moved to the rear tray side and placed in an environment completely different from the conventional audio set body side. Therefore, the electronic circuit component group for driving the speaker is placed in an environment where there is a high risk of dust and water droplets, and it becomes impossible to guarantee sufficient reliability. There is a problem that a new heat dissipation mechanism must be provided for the circuit parts.

Therefore, in view of the above problems, it is an object of the present invention to provide an active speaker unit that is dust-proof, waterproof, and heat-dissipating.

[0006]

[Means for Solving the Problems]

 According to the present invention, a cap is provided on the back side of the speaker, and the electronic circuit component group for driving the speaker is housed in the cap. The cap is fixed at its opening to the frame carrying the speaker. The heat generating circuit component of the electronic circuit component group is directly attached to the cap with a heat conductive medium interposed therebetween. In this case, the cap needs to be made of metal with good thermal conductivity.

Alternatively, the heat generating circuit component is directly attached to the frame of the speaker with a heat conductive medium interposed therebetween. In this case, the cap may be made of synthetic resin or metal.

[0008]

[Action]

 Since the electronic circuit component group for driving the speaker is surrounded by the cap, the dustproof property and the waterproof property are sufficiently satisfied. Further, the heat generated from the heat-generating circuit components is radiated through the metal cap and the frame, or is radiated directly from the frame, so that the heat radiation property is sufficiently satisfied.

[0009]

【Example】

 FIG. 1 is a partial sectional side view showing a first embodiment according to the present invention. In the active speaker unit 10 of the present invention, a metal cap 15M is provided on the back side of the speaker 11. The cap 15M holds the electronic circuit component 13 via the donut-shaped print substrate 14. The opening 16 of the cap 15M is fixed to the frame 12 of the speaker 11. Thus, the electronic circuit component group (13, 13P) is completely housed in the cap 15M.

On the other hand, in the electronic circuit component group, the heat generating circuit component 13P such as a power IC is directly attached to the metal cap 15M with the heat conductive medium 17 interposed therebetween. The opening 16 of the cap 15M is also fixed to the frame 12 with the heat conductive medium 17 interposed therebetween. The frame 12 is made of iron or high-rigidity aluminum. Considering the heat conductivity, the latter aluminum is preferable. Similarly, the metal cap 15M is preferably made of high-rigidity aluminum.

Thus, the heat generated from the heat generating circuit component 13P is radiated from the frame 12 through the cap 15M and the heat conductive medium 17. Reference numeral 18 in the drawing denotes a hole for back pressure release of the speaker 11, and 19 denotes a power supply to the electronic circuit component group and an input audio signal cord. As the heat conductive medium 17, a heat-dissipating rubber sheet or heat-dissipating grease (silicon grease) can be used, and the heat-dissipating medium 17 is appropriately selected according to the place of use. Both are commercial products.

FIG. 2 is a partial sectional side view showing a second embodiment according to the present invention. Although the cap 15M made of metal is used in the first embodiment, the cap 15 of the second embodiment may be made of metal or synthetic resin. This is because, in the second embodiment, the heat generated from the heat-generating circuit component 13P is radiated directly to the frame 12 without passing through the cap. Therefore, the cap 15 can be made of synthetic resin inexpensively and lightly. In this case, since the back surface of the printed circuit board may be in direct contact with the cap 15 (since an electrical short circuit does not occur), it is preferable to mount the circuit component 13 using the flexible printed circuit board 14F. . By doing so, the diameter of the cap 15 can be further reduced as compared with the case of FIG. The other components are exactly the same as in the case of FIG.

[0013]

[Effect of the device]

 As described above, according to the present invention, an active speaker unit that solves the problems of dust proofing, waterproofing, and heat dissipation is realized.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a first embodiment according to the present invention.

FIG. 2 is a partial sectional side view showing a second embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Active speaker unit 11 ... Speaker 12 ... Frame 13 ... Electronic circuit component 13P ... Exothermic circuit component 14 ... Printed circuit board 14F ... Flexible printed circuit board 15 ... Cap 15M ... Metal cap 16 ... Opening 17 ... Thermal conductive medium

Claims (2)

[Scope of utility model registration request] 1. An active speaker unit (10) in which a speaker (11) carried on a frame (12) and a plurality of electronic circuit parts (13, 13P) for driving the speaker are integrated, On the back side of the printed circuit board (14)
A metal cap (15M) that holds the electronic circuit component (13) through the opening and the opening (16) is fixed to the speaker frame. Circuit parts (13
Regarding P), an active speaker unit characterized by being directly attached to the cap with a heat conductive medium (17) interposed therebetween. 2. An active speaker unit in which a speaker (11) carried on a frame (12) and a plurality of electronic circuit parts (13, 13P) for driving the speaker are integrated into one, the rear side of the speaker. At the printed circuit board (14
A cap (15) for holding the electronic circuit component (13) via F) and having an opening (16) fixed to the frame of the speaker; Parts (13
Regarding P), an active speaker unit characterized by being directly attached to the frame of the speaker with a heat conductive medium (17) interposed therebetween.